The advantages of aluminum wire products

High-strength aluminum alloy conductors and heat conductors with low resistance compared to conventional ACSR has the following advantages:

(1) in the same unit weight, the aluminum conductor DC resistance, load flow, Rally, singlet tension ratio, etc.;

(2) having the same load flow conditions compared important light aluminum alloy conductor, Rally, singlet tension greater than the advantages. Aluminum alloy wire material for a single wire, easy installation and construction;

(3) low risk-bearing aluminum alloy wire can grade;

(4) Common ACSR life of about 50 years, Aluminum Wire life of 100 to 120 years.

How to care for aluminum detection tool

In Aluminum Alloys production, measurement tools for inspectors as their weapons . If the weapon is semi-paralyzed or damage to state that the test results would not make any sense , but there is no supervision of product quality control role . Therefore, measuring the maintenance and care is very important. Here are a few measurement tool maintenance specifications ( for commonly used detection tool ) :

1 Measuring exhausted after , to clean surface stains , aluminum scrap , loosen the fastening device, when the long-term ( one month or more ) when not in the measurement surface to be oiled . Gage when not , to put it in a protective case , it is best to use someone full-time , and do measuring unit testing by the authoritative annual record.

(2) Do not use the caliper jaws as the stylus tip , compasses , or other tools, are not allowed to artificially twist two jaws or to gauge when the card board uses .

3 Do not oil stone , emery cloth and rub the surface of measuring surface and measuring reticle part non- metering maintenance personnel , non- demolition , alteration and unauthorized repairs gauges.

4 Do not touch the gage measuring surface , because the hands have sweat and other dirt can contaminate the measuring surface , making it rust. Measuring do with other tools , and metal substances mixed together so as not to bruise measuring tools.

5 gage storage place should be kept clean , dry, no vibration, no corrosive gas , and to stay away from a large range of temperature change place or places where magnetic fields . Storage box measuring gages to clean and dry, are not allowed to store other debris.

6, when the surface has burrs , must go to the net burr , and then measure , or make measuring wear , and will affect the measurement accuracy of the results .

Aluminum alloy plating process

Aluminum and Aluminum Alloys by the addition of various alloy elements will be present in several different forms in the aluminum alloy . Example: in the form of solid solution into the aluminum character ; in the element itself or in the form of microscopic particles of aluminum or other alloying elements of the intermetallic compound in the form of particles in the aluminum alloy . Therefore, to find a different universal aluminum pretreatment and pre-plating process , the forks with the same satisfactory results are very difficult to teach . In the plating process , we learn from the steel parts repair plating process . Namely:

Cathodic degreasing → ??washing → washing technique anode activation → → washing → → pre- tinned copper

Activation with removal step can produce a thin oxide film thickness of the oxide film on a solid removed by use machine maple .

Aluminum is a reactive metal in the air easily oxidized , coated each step interval should be as short as possible . And kept moist , never dry spots formed . Once the formation of dry spots , it means that the surface re- oxidized, reduced junction platform strength coating the activated surface after washing and order as soon as possible with the remaining complex , preventing in -process workpiece surface is re- oxidation.

Although the plating process according to the above process operation. Of industrial pure aluminum and aluminum- manganese alloy forging is ideal, but the aluminum- magnesium , aluminum- magnesium, silicon , magnesium, aluminum -zinc alloy in the production of still occur due to junction station and force bad batch rework loop resistance elevated . After many trials attack , we improved the activation solution composition used in the activation of dilute hydrochloric acid instead of sulfuric acid , preferably the best value , improved aluminum magnesium alloy for plating a junction station force .

Ancient volume on high silicon cast alloy , fork right amount added HF, although a trace amount added , but the effect is very obvious.

Meanwhile, after Wei -phase detection cartridge tin layer , we believe that the production process caused loop resistance is too high and causes peeling thickness with pre-plating , the current size is closely related to the degree eagle . This also includes the brush plating current density . Mo brush transition with alkaline copper plating solution , plating repeated too thick. Easily cause great stress coating . Causing peeling. Current density is too too , brush plating layer , layer particle technetium big sister , grain and grain together appear crosslinked network structure transition chain ring loose micro display is not dense , and the substrate junction station is weak , it brush or causes blistering hot baking tin after blistering after the invasion when corrosive gases , exacerbating the region corrosion and ultimately lead to increased loop resistance tin layer peeling off.

After several experimented , we use the following brush tin process:

( 1 ) Brush the surface with water sandpaper carefully polished , Chen lost oxide.

( 2 ) cathodic degreasing , 12 ~ 15V5 ~ 15s, to the workpiece surface is not hanging drops, washed clean .

( 3 ) anode activation, do not ask the appropriate material selection activation solution , the voltage l5V around , 8 ~ 12s, to the surface dark gray, washed with alkaline copper plating solution without electricity wipe the surface .

( 4 ) pre- plating copper . Voltage of about 10V , l ~ 2min, washed clean .

( 5 ) Brush tin , 8 ~ 12V, power consumption is calculated by time .

According to the above process operation. Junction station to check the strength , thermal shock test according to GB5270 do . Oven heating the part to a person 150 ± 10. C, time was 2h, after removing the parts into the chilling tank , found that the coating and substrate junction station well, no blistering and peeling of the test loop resistance from the assembly plant type test group testing, electrical connectors T- , L -Block , etc. contact resistance are maintained at l5 ~ 25m '~, breaks the electrical contact elements Taipower performance standards .

Aluminum screen frame product application

An electronic aluminum frame : suitable for single -sided printed circuit boards, decals, glass, printing and other printing precision require manufacturers to use : semi-automatic screen printing presses operating mainly in the main part of the material is also suitable for manual printing .

2 treadmill printing aluminum frame : suitable treadmill printing, apparel printing , gifts , leather, plastic , glass products and toys printing manufacturers use ; printing jobs mainly for manual -type lines ( running machine ) operations.

3.CD, ceramic Aluminum Alloys frame : suitable for CD player, signs nameplate , Epoxy , keyboard , plastic, shell, etc. require manufacturers to use ordinary printing precision : print jobs to a small area of ??hand printing and printing machines based ; single frame can be customized and curved frames and other special-shaped box.

4 Precision Electronics aluminum frame : suitable for multi-layer circuit boards, LCD , SMT, membrane switch, ceramic decal , tobacco packaging printing manufacturers use high precision requirements : Printing jobs mainly in automatic screen printing machine-based , some are also suitable for precision semi-automatic screen printing presses.

5 large aluminum frame: suitable for large-scale outdoor four -color advertising, light printing, automotive glass, glass curtain wall and other large-format printers used to print large format screen printing work is mainly based.

Aluminum plant equipment operation and maintenance rules

From the law of that Aluminum Alloys equipment wear, normal wear the longer the better use of equipment. In other words, to make the use of equipment in use on the best, we must ensure that normal wear and tear of equipment equal to the natural life. Thus, we can draw such a basic concept, that is, the device is put into production after use, I hope it is in use of the available time better.

Device performance level of availability of time is determined by the equipment downtime. To achieve this goal, various factors involved, it is the device itself, in addition to the quality of the composition (including performance reliability and durability, the structure is reasonable, the selection of advanced, reasonable, processing, manufacturing quality assurance, etc.) is the basic condition, the use of the correct, rational use, well maintenance, careful management, the objective is to extend the life of equipment requirements, give full play equipment effectiveness, improve the basic conditions for the time availability . Equipment downtime, the more work, the less time available, the time may be lower utilization; Conversely, time availability is higher.

Our vision is to require device can rate one hundred percent of the time. Practical work countless examples show that the same model, same manufacturer in the same period production equipment used in the same environmental conditions, because the conditions of use and maintenance pros and cons, effects a great disparity. This situation not only between two devices, even in the same piece of equipment will vary depending on the operational use of the use of personnel, maintenance level differences, the use effect is not the same.

Characteristics and mechanical properties of aluminum alloy 2A14

The composition and properties from the point of view 2A14 it is hard alloy wrought Aluminum Alloys can also fall 2A50, 2A50 it differs in that the copper content is high, so high strength, heat resistance is good, but the hot state under the plastic as well 2A50 alloy has good machinability, electrical resistivity. performance is good spot and seam welding, arc welding and gas welding performance is poor; can be heat strengthened, with squeeze effect; Therefore, vertical transverse performance has differences; corrosion resistance is not high, but in the state of artificial aging tendency to intergranular corrosion and stress corrosion cracking tendencies.

Mechanical properties:

Tensile strength σb (MPa): ≥ 440

Elongation δ5 (%): ≥ 10

Note: The mechanical properties of longitudinal bars at room temperature

Sample Size: bar diameter (square bar, hexagonal bar inscribed circle diameter) ≤ 22

Heat treatment specifications:

A) homogenizing annealing: heating 475 ~ 490 ℃; insulation 12 ~ 14h; furnace cooling.

2) complete annealing: heating 350 ~ 400 ℃; with the effective thickness different, holding time 30 ~ 120min; to 30 ~ 50 ℃ / h speed with furnace cooling to 300 ℃, and then cooled.

3) rapid thermal annealing: heating 350 ~ 460 ℃; holding time 30 ~ 120min; air cooling.

4) quenching and aging: quenching 495 ~ 505 ℃, water; natural aging at room temperature for 96h.

Select aluminum skid plate method

A look at the use of materials, quality of aluminum used in aluminum skid plate, thickness, strength and oxidation film, should conform to the relevant standards, the wall thickness should be 1.2 mm or more, tensile strength of 157 Newtons per square millimeter , yield strength to 108 Newton per square millimeter, the oxide film thickness of 10 microns. If you can not reach the above criteria, is inferior aluminum windows and doors, can not be used.

Second look processing, high-quality aluminum alloy skid plate, fine processing, mounting stress, good sealing performance, switch freely. Poor quality aluminum windows and doors, aluminum blind selection series and specifications, processing shoddy, to replace the sawing and milling machining is not required for installation, sealing performance is poor, the switch does not freely, not only leaks and the emergence of glass burst leakage phenomenon, and the case to strong winds and external, easy to pull off some or glass blowing or touching down, destroy property wounding.

Third, look at the price, under normal circumstances, high-quality aluminum alloy skid plate due to high production costs, cheaper than inferior aluminum skid plate to be about 30% higher. Currently self-employed processing aluminum skid plate more, they do not know the structural characteristics of Aluminum Alloys skid plate and its properties. In order to reduce the cost of cutting corners, shoddy products hidden larger, generally should not be used. The best selection of regular aluminum skid plate manufacturer of the product.

Mastic awareness and understanding of complex aluminum

Aluminum alloy and polymer composite insulating material is a combination of new windows, doors and curtain wall building materials. Through this combination of aluminum profiles form a central insulating interlayer, thus achieving "insulated aluminum" purposes. Insulated aluminum composite bridge mainly wear strip with mastic two types.

Mastic composite Aluminum Plates heat energy technology originated in the United States, in general, these techniques are the polymers and aluminum mixed. Companies on behalf of the United States Eliasson type composite aluminum casting technology, by pouring the bridge molded polyurethane insulation inside and outside the two-part aluminum bonding formed into a whole in order to achieve energy-saving purposes. Its performance, technology, cost and so very satisfactory. From the late 1930s, with the widespread use of aluminum doors and windows, some of the innovative American designers began to consider the aluminum door and window insulation is poor, so as to effectively solve the aluminum energy-saving technologies.

Aluminum plant equipment operation and maintenance rules

From the law of that Aluminium Foil Plates, normal wear the longer the better use of equipment. In other words, to make the use of equipment in use on the best, we must ensure that normal wear and tear of equipment equal to the natural life. Thus, we can draw such a basic concept, that is, the device is put into production after use, I hope it is in use of the available time better.

Device performance level of availability of time is determined by the equipment downtime. Aluminum wire To achieve this goal, various factors involved, it is the device itself, in addition to the quality of the composition (including performance reliability and durability, the structure is reasonable, the selection of advanced, reasonable, processing, manufacturing quality assurance, etc.) is the basic condition, the use of the correct, rational use, well maintenance, careful management, the objective is to extend the life of equipment requirements, give full play equipment effectiveness, improve the basic conditions for the time availability . Equipment downtime, the more work, the less time available, the time may be lower utilization; Conversely, time availability is higher.

Our vision is to require device can rate one hundred percent of the time. Practical work countless examples show that the same model, same manufacturer in the same period production equipment used in the same environmental conditions, because the conditions of use and maintenance pros and cons, effects a great disparity. This situation not only between two devices, even in the same piece of equipment will vary depending on the operational use of the use of personnel, maintenance level differences, the use effect is not the same.

Insulated aluminum processing two classification

Insulation aluminum processing technology can be divided according to two categories: embedded and dispensing roll style. At present, there is no corresponding standard insulation Aluminum Film in Europe insulation systems generally use mass of technology, North America and Korea perform AAMA TIR-A8-90 plastic injection-type aluminum alloy structure building insulation performance specifications. Our bridge insulated walls and windows and doors in both the pass there dispensing strip style.

(1) Rolling embedded

Is dedicated heat insulation Aluminum Diamond Plate doors and windows, inside and outside the two aluminum insert special notch, through special machinery rolling, leaving the insulation strip fused with internal and external profiles, this approach in European countries, especially Germany and Italy, Central European countries generally adopted.

(2) dispensing formula

The basic principle is to treat aluminum alloy into two parts between the two using a specially formulated polymer insulating polymer eleven off hot glue to combine. Thus, one hundred aluminum alloy is formed between the inner and outer part of the effective heat insulation layer, so that through the door window frame profiles or fan heat dissipation pathway is blocked, to achieve energy-efficient insulation purposes.

Common quality defects in aluminum foil which

The foil strip rolled into a variety of semi-finished and finished products in the process , and in the finishing foil , annealing , transport, packaging and other processes in the production process , inevitably there will be some defects. The generation of these defects , in part, ingot casting defects strip itself sometimes the injection ingot casting process can be exposed , and sometimes can not be found , and in the subsequent further processing to exposure ; another part is in foil rolling , finishing , annealing , transport, packaging and other processes generated in the production process .

These defects generation is largely due to equipment failure , mishandling , improper adjustment of process parameters , the operator unskilled and various other causes. Production process of the aluminum foil , aluminum foil quality defects caused many species, mainly a large number of pinholes, the thickness tolerance, poor flatness , belt for various reasons , to reduce these defects , to improve the quality of the foil material is useful significance .

State in a thin Al Foil rolling , the thickness uniformity of the material , the rolling speed, tension , rolling oil is very sensitive to various defects in the most critical solution belt and pinholes , especially high speed rolling is more important. Belt and pinholes quality billet aluminum foil produced with extremely close .

Casting , hot rolling billet inclusions in the airway , the process of rolling metal and non-metallic pressure on people , rub , scratch and uneven thickness of aluminum foil rolling and so give cause great difficulties caused by broken belt , pinhole , the thickness of ultra- poor . And that these defects affect each other , thinner aluminum pinhole more quiet , the more likely the more pinholes belt , belt and more, rolling up speed in the head and tail must have been part of the foil thickness tolerance.

Aluminum colored conductive oxidation process

The conductivity of aluminum and aluminum oxidation process , the oxide film obtained is still excellent conductive properties , which is its unique properties, and protective and decorative coating performance is also very good, color matching aluminum surface layer zinc layer iridescent passivation film is more elegant , with a light and uniform color appearance of fine lines , is very promising and worthy craft.

Aluminum and aluminum conducting oxidation process is simple , no special equipment , in recent years, the conductive oxide film easily adsorbed organic coating , good adhesion can be further improved understanding , and thus as a coating ( electrophoresis , painting ) application of the substrate has also been gradually expanded.

Pretreatment process details to note in the aluminum material in the air is very unstable , easily formed with the naked eye is difficult to identify the oxide film. Since aluminum processing different methods, such as casting , or by a direct extension pressure plate cut from , or mechanical fine molding , or by different molding process after heat treatment or welding , the surface will be presented different states , different levels of dirt or traces , for the pretreatment step to the surface of the workpiece on the actual situation of the process for pre-treatment .
( 1 ) Aluminum Alloys and aluminum precision machining parts pretreatment process issues that need attention : precision machining parts although the surface of the natural oxide film Caichu generation, easy to remove , but greasy heavy, especially in and around the hole ( lubrication due to the machining process need to add ) , this kind of work must be approved by an organic solvent cleaning , if the direct use of caustic not only difficult Ex greasy heavy and fine processing of surfaces can not afford a long period of alkali corrosion , the results will be affect the workpiece surface with roughness and tolerances , may eventually become waste.

( 2 ) aluminum alloy and aluminum casting parts in the pretreatment step problems that need attention . Not all pieces of casting surfaces are machined , machined surfaces without leaving formed during casting too thick oxide layer , and some interbedded with sand , then you should use the first method of machining or sandblasting to remove this part of the original oxide film , or by caustic after processing, the only way to both Ex unprocessed parts of the original oxide layer, and avoid machined parts tolerances change.

( 3 ) heat-treated aluminum alloy and aluminum welding workpieces or previous treatment process issues that need attention : pendulum cesium process requirements , the workpiece into the heat treatment or welding processes required by the organic solvent prior to cleaning, in addition to the net surface oil, but it is generally not do this , so the workpiece surface to form a sintered layer of oil coke material , this layer of coke in organic solvents is difficult in addition to the net , if soaked in lye can cause localized corrosion , pitting or cause arising uneven , seriously affecting the quality of products.

Aluminum windows and doors of the six indicators of material

Progress of the times , many people have begun to focus on quality of life, ease and comfort of home environment has become more concerned about the field , so in recent years , aluminum doors and windows has been favorable for consumers , almost anywhere in life you can see to its presence , today Xiaobian to continue to spread information on the six indicators of material aluminum windows and doors .

1 , Thickness: aluminum sliding doors , 70 series, 90 series are two residential interior aluminum sliding doors with 70 series can be. Series number indicates the thickness of the door frame structure dimensions in millimeters . Aluminum sliding windows , 55 series, 60 series, 70 series , 90 series of four. Series selection should be based on the size and the local wind pressure or windows depending on the value . As a closed veranda aluminum sliding windows should not be less than 70 series.

2 , Strength : Tensile strength should reach 157 Newtons per square millimeter , the yield strength to reach 108 Newtons per square millimeter . When you purchase , you can hand moderately curved profiles, let go after the state should be able to recover .

3 , color : Aluminum Alloys with a color should be the same, such as color obviously , that should not be optional .

4 , flatness : Check the aluminum alloy surface , there should be no dents or bulges .

5 , gloss : aluminum windows and doors opening to avoid bubbles optional surface ( white dots ) and ash ( black spots ) , as well as cracks, burrs , peeling and other obvious defects profiles.

6, the oxidation degree : an oxide film thickness of 10 microns. When you purchase may be scratching the surface of the profile look to see whether the surface of the oxide film can be erased .

Heat-treated aluminum profiles online technical parameters

Aluminum Alloys extrusion die to leave through three stages, namely close to quenching, quenching and cooling to ambient temperature after quenching , in order to prevent undesired precipitation of a second phase , is about to enter the cooling device profiles (quenching zone) the temperature must be in the above solvus temperature . The cooling rate of the cooling device and the cooling contact time should be sufficient to obtain the desired components of a supersaturated solid solution , the final properties of the product meets the requirements . Requirements extrusion die to quench zone distance should be as small as possible , ie to try to quench transfer time shorter .

Extrusion line can be quenched alloy has the following features :

( 1 ) having a structural applications in accordance with the tensile strength properties ;

( 2 ) low quench sensitivity , can be a variety of different products using forced air cooling section without using water quenching ;

( 3 ) alloy solid solution between the line and the solidus temperature range, easy to control the outlet temperature of the desired products, the solution temperature range ;

( 4 ) use air cooling material has sufficient toughness ;

( 5 ) extruding the solution temperature at the low deformation resistance , to minimize the deformation energy and synthesis temperature , allowing to obtain a higher extrusion speed

Aluminum features, applications and sources

Aluminum is a silvery white light metal , a very wide range of applications , known as the second metal , its production and consumption is second only to iron and steel . Bo is the density of aluminum 2 .7 × 103kg / m3, about steel l / 3. When the cross-sectional area and length are the same, the conductivity of copper aluminum 64 %, if calculated by mass , its conductivity is 200% copper , good thermal conductivity . As can be formed on the surface of a solid layer of thin aluminum oxide film , can prevent further oxidation , therefore , the aluminum in the atmosphere , water and some corrosive medium high corrosion resistance . Aluminum, plastic, easy to withstand pressure processing, can be drawn into filaments or pressed into thin slices ; while being able to make it through the cold and hardened alloy .

Aluminum is characterized by a low density , high specific strength (strength to density ratio ) , but also has good ductility and corrosion resistance. In addition, most of the aluminum alloy can be enhanced to the heat treatment method . According to their composition and production process, aluminum can be divided into deformable aluminum and cast Aluminum Alloys . Which can be wrought aluminum alloy hot rolled , cold rolled , stamping , extrusion , bending, curling and other mechanical processing, so a wider use . Rust-proof aluminum alloy can be divided into (A1-Mn and Al-Mg based alloy ) , hard alloy (Al-Mg-si and Al? Cu-Mg alloy ) , hard aluminum (A1-Zn-Mg-cu alloy ) , wrought aluminum (Al-Mg-si-cu -based alloys) .

Aluminum and aluminum alloys , mainly used in the construction industry , the production of windows and doors , partitions , ceiling, and outdoor decoration ; in the aerospace and defense industry sectors are also widely used aluminum alloys, manufacture of aircraft , ships , guns , etc. ; in power transmission , commonly used high strength steel wire reinforced aluminum cables for overhead lines ; addition , automobile manufacturing, container transport, daily necessities , household appliances , machinery and equipment and other fields have extensive use of aluminum and aluminum alloys .

With the production, consumption increases, the amount of waste aluminum products is also growing , and many are single-use aluminum products , products made to the product from the loss of use value is shorter, and therefore its disposal miscellaneous materials into the source of contamination . Meanwhile, aluminum and aluminum alloy is a kind of high environmental load materials , production requires a lot of power , therefore, how to make the best recycling of scrap materials, both the economic development needs, but also environmental protection requirements.

Miscellaneous scrap material stems from its wide range of applications . Differs in its use led to its composition, properties are quite different to the scrap material recycling and reuse create great difficulties . In order to cost less exhausted recycled aluminum , and to ensure the quality of recycled aluminum can continue to meet a variety of needs , the classification of scrap for recycling is very important. If you do not classify cleaning , screening and blind remelting , recycled product is not working, there may even become garbage again . To this end, the advanced industrial countries have developed a corresponding scrap standards or professional standards. For example, Japan's National Institute of Standards JIS (H119) based on aluminum scrap alloy type , recency , shape, divided into 28 kinds of sources , and the secondary alloy manufacturing processes and quality assessment have corresponding regulations.

Simple test anodic oxide film 5 Ways

The quality of the oxide film can be detected by the following method ;

1 View of colors. Generated surface oxide film is a milky white Aluminum Alloys , cast aluminum , miscellaneous aluminum grayish black . Did not generate the surface oxide film was transparent bright white , some black or gray with pink hanging cream.

2 The measured resistance . Generated when the detection of the oxide film resistor , pressure not conductive. The oxide film is not generated when a detection conductor .

3 scratches the surface of the oxide film has generated very hard, when you draw with a needle slipping, no scratches, the surface of the oxide film is not generated very soft, with a needle and scratch resistance when planning .

4 Listen to the sound of banging oxide film has been generated will be issued when the crisp sound, the oxide film is not generated when issuing muffled beat

5 coloration test. Oxide film has been generated in the dye solution soon be colored oxide film is not generated in the dye solution dyed not color

Aluminum temperature setting and control technology

1, aluminum temperature setting and control: usually, warm temperatures with the table there were some errors when setting the table according to the furnace temperature and the actual temperature to be set, and pay close attention to temperature fluctuations.

2, aluminum heat aging: in strict accordance with requirements of the aging process, the holding time should be appropriate to prevent the over-aged and under-aged or cause insufficient hardness. Blank framed, mounted stove

3, aluminum extrusion framed not too close, to have spacing between the material and the material, especially the non-ventilated Aluminum Alloys small material, thick material to be bigger interval more, tubing and small material, sheet combined installed a box, aluminum tubing placed beneath it is a good time-circulating air.

4, aluminum furnace installed to 6xxx alloys and other special furnace installed separately from normal aging 6063, due to production reasons you really want the same heat aging, it is necessary to have access to special alloy subjected to aging process.

Out of aluminum extrusion, without low hardness before aging, not as a finished product to use, so, in general, must be to improve strength after aging. Typically, aging can be divided into two kinds of natural aging and artificial aging, aluminum 6xxx aluminum production now or in the future basically dominated.

primary aluminum, fabricated aluminum and aluminum alloy production methods

Current industrial production of primary aluminum is the only way Hall - Carvoeiro electrolytic method. Hall by the United States and France Carvoeiro invented in 1886. Hall - Carvoeiro electrolytic method is based on aluminum oxide as raw materials, cryolite (Na3AlF6) for the flux composition of the electrolyte, at 950-970 ℃ under the conditions of the electrolyte through the electrolysis of alumina in the melt decomposition of aluminum and oxygen, carbon cathode, aluminum is precipitated liquid oxygen to the carbon anode in the form of carbon dioxide gas to escape. To produce one ton of primary aluminum, can produce 1.5 tons of carbon dioxide, the consolidated power in 15000kwh so.

Industrial Aluminum Alloys cell can be divided into the side plug anode Soderberg, inserted on the anode and Soderberg anodes slot categories. As Soderberg technology in the electrolysis process high power consumption, and not conducive to the protection of the environment, so Soderberg technology is being phased out. The current global annual production of about 28 million tons of primary aluminum, China's annual output of about 7 million tons of primary aluminum.

When necessary, the resulting aluminum electrolytic refining to obtain high purity aluminum. The current method for producing aluminum alloy melt with mainly based method. Since aluminum and aluminum alloy has excellent workability, so by forging, casting, rolling, punching, pressing and other methods to produce sheet, strip, foil, tubes, wires and other profiles.

Ultra-fine aluminum silicate used in the coating of the benefits

Replace part of superfine aluminum Titanium dioxide is widely used in the paint industry at home and abroad technology has obvious economic benefits. Here for you to explain ultrafine aluminum silicate in the coating played some role:

1, to improve the whiteness of paint.

Ultrafine titanium silicate replace part of, not only does not change the titanium dioxide dry hiding power, but also improve the whiteness of paint. If the same amount of titanium dioxide, which will significantly improve the dry hiding power and whiteness large amplitude will increase.

2, the role of a buffer PH value.

PH value range of ultra-fine Aluminum Alloys silicate 9.7-10.8, with PH value buffer. In particular, vinyl acetate latex storage process, to prevent the hydrolysis of vinyl acetate leaving the PH value decreased, thus increasing the dispersion stability of the paint, while avoiding the inner wall of the metal container to corrode.

3, the paint has a good suspension.

Ultra-fine aluminum silicate, the grid structure makes the paint system is slightly thickened, with good suspension, and prevent solids sink to the bottom and surface water separation phenomenon.

4, enhanced paint scrub resistance, weather resistance.

Ultrafine aluminum silicate paint film that has a good scrub resistance, weather resistance, but also shorten dry time.

5, with a matting effect.

Ultra-fine aluminum with matting effect, so the semi-gloss, matt paint may be used as a matting agent economy, should not be used in the light paints.

How to identify the quality of solar aluminum type

1, identity checks: Solar aluminum and packaging products are marked with the standard code and production license number, etc.;

2, the surface quality: In addition to the solar aluminum surface should be clean, does not allow cracks, peeling, corrosion and bubbles and other defects exist, but also does not allow corrosion spots, electrical burns, dark spots, shedding oxide film defects such as;

3, the oxide film thickness: Solar Aluminum Alloys oxide film is formed by anodic oxidation, a protective and decorative effect, can be used to detect eddy current thickness;

4, the sealing quality: on-site inspection in general by acid leaching, poor sealing will leave visible traces of solar aluminum, traces of heavier Description sealing quality worse;

5, the corrosion resistance: can be alkali drop test, was visually observed until the droplet at corrosion bubbling oxide film is calculated through time, this test easily outdoors in the summer coarse synchronization judgment, in order to ensure the test Accuracy in the laboratory must be carried out under stringent conditions require.

Aluminum and aluminum alloy electroplating pretreatment process improvement

Aluminum and aluminum alloy metal plating surface , the surface can significantly improve their physical or chemical properties , made ​​of aluminum and aluminum alloy conductor, silver plating on its surface to increase the surface conductivity or electrical contact parts ; as the aluminum easy welding, plating on the surface of copper, nickel or tin ; order to improve its wear resistance , plating thickness on the surface of Ge . In the decorative aspect , in fact, mostly plating Ge .

Aluminum and Aluminum Alloys surface plating , a long time ago and have been trying for the actual production . However, the coating of aluminum and aluminum alloys and between the oxide , aluminum and aluminum and the metal plating layer different thermal expansion coefficients , and the residual coating with pinholes and other factors plating solution , resulting in poor coating adhesion , prolonged use may peel off even in the plating immediately after peeling , in the field of surface treatment of aluminum and aluminum alloy plating process is still in the exploratory stage, has long been no substantive breakthrough , has not formed a complete and mature technology . Coating adhesion is not strong aluminum and aluminum alloy plating quality and product qualification rate is still the industry bottlenecks.

Two traditional aluminum and aluminum plating

Aluminum and aluminum electrolysis in the electrolyte can form a coating, but the coating adhesion is not strong , easy to peel . Therefore, the first aluminum oxide compound in an aqueous solution containing zinc plating then electroplating deposition , this method both for zinc substitution method or a deposition method . But also the first in the surface treatment of aluminum and aluminum alloy obtained by anodic oxidation power thin layer of porous oxide film during plating.

2.1 Conventional aluminum and aluminum alloy electroplating process

Aluminum and aluminum alloy electroplating process have pre-plating treatment, plating , after plating processing three parts. Pre-treatment is related to the merits of the product quality plating of the most critical processes , its main purpose is to remove the aluminum and aluminum alloy surface oils , naturally formed oxide film and other contaminants .

Conventional general process: degreasing - washing - Less eclipse - washing - pickling - washing - Activation - washing - a dip zinc - washing - retired Zinc - washing - Secondary dip zinc - washing - Neutral Nickel - washing - subsequent plating.

There is also replaced the wave anodic oxide film during the subsequent post- dip zinc plating process .

2.2 conventional pre-treatment process deficiencies

1 long process , process more .

2 complex process, a narrow operating range , the process parameters must be strictly controlled .

3 . Process scope is not wide , different grades of aluminum pre-treatment process can not be identical, adjustments must be based on grade aluminum pre-treatment process .

4 In the strict control of pre-treatment process under the premise of electroplating products pass rate is very low, ordinary decorative plating passing rates of 85% to 90% , functional electroplating pass rate of 60% to 70%.

5 The pot life of each process solution is short, the processing cycle is short.

Since conventional pre-treatment of aluminum and aluminum agree more widespread lack , therefore, must be improved .

Three . Improved Universal aluminum and aluminum plating pre-treatment process

Degreasing alkaline etching combo - washing - pickling - washing - go gray - washing - alkali activation - dip zinc - washing - Neutral Nickel - washing - up plating.

Four . Practice summary

New processes for the current actual defects aluminum plating , combined with aluminum to teach their special physical and chemical properties, in the original process improvement on the basis of the specific advantages:

1 short process, through selective dissolution of the surface layer of aluminum and other metals to improve the purity of aluminum alloy surface , coating adhesion is improved .

(2) was first activated with alkaline acidic activation process to completely replace the clearance rate of alloy plating pre-treatment process of surface residual silicon and silicone, effectively improve coating adhesion .

3 alkaline activated zinc dipping directly without washing , to avoid acidic activation after washing and then the second dip zinc exposure in air to form an oxide layer .

4 Just a simple dip zinc can, significantly better than the secondary coating adhesion complex, multi -dip zinc and zinc cyanide leaching process .

5 . Process wide versatility , almost all grades of aluminum used in the plating pre-treatment.

6 products plating time pass rate was significantly higher than the traditional process . If a simple coating adhesion quality assessment, the product qualification rate of close to 100%.

7 actual production process is simple and convenient.

8 automatic production line for a long time scale gantry actual production proved , the improved new aluminum plating pre-treatment is very stable .

9 easy in the traditional aluminum plating process on the basis of process improvement .

10 Using power -ho into aluminum oxide can be achieved quickly improve the film speed, shorten the film on time, save resources, to achieve the effect of cost savings .

Aluminum crack causes and solutions

Cracks in the aluminum alloys extrusion profiles by tensile stress levels in the surface of different metal lateral tearing. The main cause of this phenomenon, the analysis, mainly the following:

First, because the friction causes the metal surface being attached to the role of tensile stress, when attached to a metal surface is greater than the tensile strength tensile stress is generated when the crack;

Second, the extrusion temperature is too high, the metal surface tensile strength decline in the cracks under the action of friction;

Third, the extrusion speed is too fast, the metal surface with tensile stress suffered cracks increase the profile.

The method can solve this reason, only the strict control of the extrusion process parameters to ensure reasonable exit speed and outlet temperatures, in order to reduce the phenomenon of aluminum crack. This requires the company's strict checks and supervision of production processes.

Model and the deposition rate of aluminum between

The pros and cons of aluminum components can be distinguished in the alkaline etching time, if the workpiece surface after alkaline etching there is too much gray and black films, or red film, then this section is necessarily high silicon aluminum or copper, for The chemical conversion of aluminum alloys forming time in relation to shorten, or received a conductive film is bound to be difficult to meet the requirements.

Therefore, depending on aluminum oxide is required to master different. To do this, different types of aluminum aluminum parts also allow lashing in the same bunch as they may therefore not control their proper oxidation time.

Different types of aluminum through a conductive chemical conversion treatment, aluminum exterior color difference different than for any other process recipe oxide film obtained difference more obvious. Generally, the higher the purity aluminum, the slower the film; Conversely, if the aluminum purity is lower, then it will equally faster deposition rate.

By use of aluminum alloy, surface treatment requirements classification

Aluminum is the rod by hot melt extrusion, to obtain different cross-sectional shapes of an aluminum material.

First, use can be divided into the following categories:

1 building with windows and doors aluminum doors and windows (divided into two kinds of windows, doors and curtain walls).

2. CPU dedicated radiator aluminum radiator

3 shelves aluminum alloy, the difference between them is that different cross-sectional shape, but are out of the hot-melt extrusion.

Second, according to alloy into a Category:

Can be divided into 1024,2011,6063,061,6082,7075 grade aluminum and other alloys, the most common of which six lines of different grades of difference is that the ratio of metal components is not the same, in addition to the commonly used aluminum windows and doors such as 60 series, 70 series, 80 series, 90 series, curtain wall series aluminum construction, the industrial aluminum is no clear distinction between models, most production plants are in accordance with the customer's actual drawing processing.

Third, by surface treatment requirements Category:

1 Anodized Aluminum

2 electrophoretic coating aluminum

3 Powder Coating Aluminium

4 grainy transfer aluminum

5 planed aluminum

Aluminum processing how to avoid bending phenomenon

First, we need to know, straight This process is aluminum bending phenomenon of multiple links. The staff responsible for straightening straightening must pay attention to when your hands are using force. Excessive force may be deformed shapes, shut, orange peel, etc.; Conversely, if the force is too small will result in not straight tone generated profiles, resulting in bending.

The second is the aluminum extrusion framed, this session is very important. After the saw cut lengths, it is often necessary to carry framed it. Framed, the staff in charge of this process must pay attention to the size of the material, and the material is still flat die with a pipe to pull out of the material. Also, if billet aluminum surface after aging, the hardness has been compliance is detected, then the profile will not be so easy to become curved, but still have to pay attention when shelves, ends when lifting materials, aluminum try to maintain stability and prevent large fluctuations, aluminum sheet profiles have been severe limitation of the floating will cause some curved profiles.

Anodized aluminum surface stained Causes of Flooding

Resulting Anodized Aluminum surface flooding after staining were the following main reasons:

1 piece caustic pre-treatment is not thorough enough.

(2) low melt temperature dyeing.

3 staining solution surface oil.

4 film did not retire net rework.

5 oxide film is contaminated.

6 After oxidation washed thoroughly enough, not cleaned.

7 aluminum anodizing current density is too large.

8 anodizing solution temperature is too low, the current density is too small.

9 aluminum anodizing solution temperature.

Aluminum plant equipment operation and maintenance rules

From the law of that aluminum sheet equipment wear, normal wear the longer the better use of equipment. In other words, to make the use of equipment in use on the best, we must ensure that normal wear and tear of equipment equal to the natural life. Thus, we can draw such a basic concept, that is, the device is put into production after use, I hope it is in use of the available time better.

Device performance level of availability of time is determined by the equipment downtime. To achieve this goal, various factors involved, it is the device itself, in addition to the quality of the composition (including performance reliability and durability, the structure is reasonable, the selection of advanced, reasonable, processing, manufacturing quality assurance, etc.) is the basic condition, the use of the correct, rational use, well maintenance, careful management, the objective is to extend the life of equipment requirements, give full play equipment effectiveness, improve the basic conditions for the time availability . Equipment downtime, the more work, the less time available, the time may be lower utilization; Conversely, time availability is higher.

Our vision is to require device can rate one hundred percent of the time. Practical work countless examples show that the same model, same manufacturer in the same period production equipment used in the same environmental conditions, because the conditions of use and maintenance pros and cons, effects a great disparity. This situation not only between two devices, even in the same piece of equipment will vary depending on the operational use of the use of personnel, maintenance level differences, the use effect is not the same.

Mastic awareness and understanding of complex aluminum

Aluminum Alloys and polymer composite insulating material is a combination of new windows, doors and curtain wall building materials. Through this combination of aluminum profiles form a central insulating interlayer, thus achieving "insulated aluminum" purposes. Insulated aluminum composite bridge mainly wear strip with mastic two types.

Mastic composite aluminum heat energy technology originated in the United States, in general, these techniques are the polymers and aluminum mixed. Companies on behalf of the United States Eliasson type composite aluminum casting technology, by pouring the bridge molded polyurethane insulation inside and outside the two-part aluminum bonding formed into a whole in order to achieve energy-saving purposes. Its performance, technology, cost and so very satisfactory. From the late 1930s, with the widespread use of aluminum doors and windows, some of the innovative American designers began to consider the aluminum door and window insulation is poor, so as to effectively solve the aluminum energy-saving technologies.

Do you know how much use aluminum foil tape

Aluminium Foil Tape very versatile, so we need to set out the detailed, easy to understand foil tape for more information. We all know that the Internet has introduced aluminum foil tape uses a variety of information, but can provide substantive but not a few, here to give us a nutritious content.

In life, we have a common foil tape in many places, in fact, aluminum foil tape is mainly used in the cold (hot) gas pipeline dressing, generally do cold (warm) water heaters, gas engineering, and manufacturers are more available. In addition, aluminum foil tape is also widely used in refrigerators, air withered, automotive, petrochemical, bridges, hotels, electronics and other industries.

Why use aluminum foil tape with double-sided tape as it is very wide? Here need to know is: is an industrial tape aluminum foil tape is a high self-adhesive anti-UV ability of the new outer corrosion protection materials. Mainly used for natural gas, petroleum, chemical, pharmaceutical, heating, urban construction in the oil, gas, water, heating ducts or aerial tower structure corrosion protection. This trait foil tape to meet the needs of many of the packaging industry, to bring modern life safety strong guarantee.

In fact, different models from different manufacturers foil tape is a big difference, but high quality pressure sensitive adhesive, strong adhesion, anti-aging and other effects! Insulation performance greatly improved specifications (0.05mm-0.08mm) * each kinds of foil tape width and length is the best choice for customers. Since aluminum foil tape with all the seams paste composites, insulation and sealing nail puncture repair breakage. A refrigerator, freezer manufacturer's main raw materials, insulation materials distribution sector will purchase raw materials. Therefore, aluminum foil tape widely taken for granted.

Aluminum melt transfer and pouring Precautions

Although the density of solid aluminum oxide similar to the density of molten aluminum, the aluminum melt entering the inside, after a sufficiently long time to sink to the bottom of the crucible accompanied. The molten aluminum is oxidized to form an alumina film, but only in contact with the aluminum alloys melt side is dense, porous side in contact with air and a large diameter 60 - 100A holes, surface area, adsorption strong, easily adsorbed moisture, anti there is a tendency to float. Thus, the oxide film and the small difference in the proportion of aluminum melt, mixing it with the melt, drifting very slowly, it is difficult to exclude from the melt, the formation of pores in the casting too inclusions. Therefore, the key transfer molten aluminum is to minimize the mixing of the molten metal, the melt to minimize contact with air.

Tilting crucible using transfer note melt, to avoid melt mixed with air, it should try to rely on the furnace ladle nozzle, and tilted so that the melt downstream along the side wall of the ladle, will not underwrite the direct impact , the occurrence of agitation, splash and so on.

Pouring the correct and reasonable approach is to get one of the important quality castings. Note the following for preventing, reducing casting defects is very effective.

(A) should be carefully checked before pouring the melt tapping temperature, ladle capacity and dryness of the surface coating layer, whether it is another tool to prepare either. Before pouring the metal pouring cup 3 - 5 minutes in a good place on the sand, when the ladle temperature not higher than the breast 150 degrees, placed premature or excessive temperature, the inner runner choked lot of gas, in pouring a risk of explosion.

(B) is not on a "Guotang Feng" in a case casting, and the strong melt oxidation, burning, produce the casting defects such as oxide inclusions.

(Three) obtained from the crucible melts, should be used to underwrite gently poke the melt surface oxide or flux layer, slowly ladle immersed in the melt, a wide mouth with ladle scooping melt , and then lift the ladle smooth.

(Four) do not end when the package palm flat, the pace should be steady, not raised too high ladle, ladle metal surface must be stable, without rope move.

(Five) about pouring should Grilled net ladle slag, slag will avoid casting, oxide, etc. into the mold.

(Six) in the casting, the melt flow to remain stable, can not be interrupted, not straight into the arms of the bottom outlet port. Gate pregnant mother to the end shall be filled from the liquid level shall not turning, casting speed should be controlled properly. Typically, the degree to slightly slower start pouring the melt filling smooth and slightly faster, and casting speed remained unchanged.

(Seven) in the casting process, ladle nozzle and the distance runner as close as possible to the extent of not more than 50 mm in order to avoid excessive oxidation of the melt. ,

(Eight) with a blocked gate arms, blocking is not reversed too early in the melt filled the gate arms, then slowly oblique aside, so as not to melt when the injection sprue vortex.

(Nine) from the bottom of the crucible 60 mm below the melt should not be pouring castings.

Foil tape and aluminum foil What is the difference

Aluminum foil products are widely used in recent years, our products, and the emergence of aluminum foil tape truly broad and used in the country's major industries have a very good application, especially in the emerging industry just has a good connection, including electronics, mobile phones, computers, LED displays. But many people do not know foil tape and aluminum foil What is the difference? Then in order to allow you to have a comprehensive understanding, we focused on these two products make a targeted introduction.

For aluminum foil, view related content:

Developed countries in Europe, for packaging foil products for 70% of total demand. Aluminum foil in the Chinese market is mainly used as industrial raw materials, manufacturing, packaging foil accounted for only 30% of total domestic demand. Although aluminum foil packaging development late, but rapidly growing market prospects attention.

Extensive use of aluminum foil, for example: air food packaging, ordinary meat packaging, cigarette packaging. Relevant experts according to their different application characteristics, it would be divided into more than 20 varieties. Different countries due to differences in levels of economic development, foil consumption structure also exists a big gap.

Aluminum foil in architectural applications is quite significant, paste on the surface of the insulation material to reach the construction more convenient, clean and especially aesthetics has reached a new height. However, the effect of different types of aluminum foil varies greatly, such as fire and ordinary is not a grade.

Aluminium Foil Tape, what is it? Foil tape to look for information:

Aluminum foil tape made of high quality pressure sensitive adhesive, strong adhesion, anti-aging and other effects! Insulation performance is greatly improved, the specifications are (0.05mm-0.08mm) * various widths and lengths. Aluminum foil tape with all the seams paste composites, insulation and sealing nail puncture repair breakage. A refrigerator, freezer manufacturer's main raw materials, insulation materials distribution sector will purchase raw materials.

Aluminum foil tape products are widely used in refrigerators, air withered, automotive, petrochemical, bridges, hotels, electronics and other industries.

In fact, aluminum foil tape and aluminum foil difference is quite large, so be sure to really understand.

Aluminum smelting temperature control

Refining temperature is too low, is not conducive to the dissolution of alloying elements and gas inclusions discharge, increasing the formation of segregation, cold shut, due to cast a tendency, but also due to lack of heat riser, so feeding the casting not reasonably have data indicate that all Aluminum Alloys smelting temperature of at least 705 degrees and should be stirred. Melting temperature not only waste energy, more serious because the higher the temperature, the more hydrogen, are more coarse grains, the more serious the oxidation of aluminum, a number of alloy elements is more severe burning and thus the mechanical properties of the alloy drop, casting and machining performance deterioration, the effects of weakening modification, reduction casting airtightness.

Production Practice has proved that the liquid alloy to a more rapid warming temperatures, a reasonable mix, in order to promote the dissolution of all alloying elements (especially refractory metals), hold in addition scum fell after pouring temperature, so that the minimum degree of segregation , hydrogen fusion also less conducive to obtain uniform and dense, high mechanical properties of the alloy, because the temperature of molten aluminum is difficult to judge with the naked eye, so no matter what type of melting furnace, should be controlled with Thermometer temperature. Thermometer should regularly check and repair. Thermowell should cycle with a metal brush clean, coated with a protective coating to ensure the accuracy of the results and to the Director temperature service life

Thermal insulation aluminum doors and windows production elements

Aluminum windows and doors of buildings is part of the structure outside the building, the building the most sensitive parts of the heat exchange, which is the wall energy per unit area of ​​5 to 6 times the total heat loss of doors and windows of buildings 40% above. Doors and windows outside the building heat loss in three ways: first, through the aluminum alloy heat conduction losses; Second, radiation heat loss through the glass; Third, through doors and windows of the air gap convection heat loss. Thus, the production of thermal insulation aluminum windows and doors from the three aspects should be considered.

1 aluminum alloy aluminum alloy material is a good conductor of heat, the majority of relatively high thermal conductivity. To be made of glass insulation, to choose a thermal bridge processing profiles, namely thermal conduction path blocking profiles, in order to achieve thermal insulation purposes.

Two glass insulation aluminum windows and doors need to use hollow glass, because the cavity between the hollow glass filled with dry, still air, the thermal conductivity greatly reduced, thus insulating glass has excellent heat insulation, sound insulation and anti- Cream coagulation, condensation properties, commonly used insulating glass glass thickness 5 ~ 6mm, common cavity thickness 9mm, 12mm.

3 doors sealing material insulation should be used with sealant weathering plastic, sealing tape should be used in corrosion resistance to ozone and UV aging resistance of neoprene rubber products, doors and windows open fan overlap in part to set three more sealant Article.

How to do aluminum doors and windows maintenance program

1, according to the external surface area of ​​gray Aluminum Alloys doors and determine the extent of contamination and the number of doors and windows cleaning cycle at least once annually.

2, cleaning gondola outside the walls doors and windows should be flexible and convenient operation. Do not use more than four wind gondola aluminum doors and windows to avoid bruising the wall.

3, the use of hanging blue wash walls in place by hanging blue bundle cushion. Doors and windows to prevent bruising.

4, washing windows cleaners use a neutral detergent.

5, the aluminum surface of serious pollution Do not use hard objects of metal scraping.

6, cleaning windows and doors of the construction personnel shall not support the weight of the lid on and walk.

7, in the exterior surface of the front suspension La Shengsuo gland should be added protection.

8, encountered the typhoon season should turn fan off.

Aluminum windows and doors aluminum selection knowledge

The rational design of the sash ratio and orientation. Generally, the heat transfer coefficient is greater than with the windows facing the same area of ​​the wall heat transfer coefficient, therefore, heating energy window wall as the proportion of the heat increases. Lighting and ventilation in under the conditions allowed to control the proportion of window to wall ratio setting curtains and window insulation panels more efficient, that is smaller than the design window and wall area, the smaller the heat loss, energy-saving effect is better. Heat loss is also related with the outside windows facing south, north facing solar radiation intensity and high sunshine, window solar heat gained much.

Use energy-saving materials. Since the development of new materials, the main material composition window (frame materials, glass, seals, hardware accessories and shading, etc.) technology has made rapid progress, the use of energy-saving materials are aluminum clad wood windows and doors energy efficient way. Frame material: profiles for windows outside the window opening area of ​​about 15% to 30% percent, the energy loss of exterior windows in another weak link, so the choice of profiles for windows is also essential. Currently many types of energy-saving window frames, such as: aluminum insulation, insulation steel, plastic extrusions, aluminum alloy doors and windows aluminum and so on. Among them, aluminum insulation energy-saving effect is better, more widely used, which not only retains the advantages of aluminum, but also greatly reduces the aluminum heat transfer coefficient. Insulation aluminum is used in aluminum alloy sections in the thermal bridges (cold bridge) technology enables the profile is divided into inner and outer two. Insulation aluminum called aluminum doors and windows.

Aluminum windows and doors systems application and development of

1, the foreign development and application of aluminum alloys windows and doors

Aluminum windows and doors as early as the 1930s in Europe and the United States and other advanced industrial countries began trial application. After World War II, because the aluminum industry technology advances, aluminum doors and windows due to get a guarantee of basic materials, so that the aluminum doors and windows since the 1950s began to get a high-speed system development. Aluminum with excellent features a modern construction industry, in addition to steel other than the most widely used metal materials, aluminum doors and windows to become a major architectural metal doors and windows.

Europe and the United States aluminum doors mainly used for public buildings, profiles and more use of thermal profiles, glass are used hollow glass, window type air-tightness mainly good flat open based. Aluminum windows and doors market share in Western Europe and 27%; Northern Europe is mainly based on thermal insulation to select window type; Central Europe put windows and doors as part of the furniture to choose; Southern Europe places to choose whichever architectural features.

(2) domestic development and application of aluminum windows and doors

Aluminum windows and doors in our country is the late 1970s, after the reform and opening from Europe, America, Japan and other countries the introduction of technology, developed in the eighties a new generation of metal doors and windows. European heavy-duty windows, Japanese and American light windows are not suitable for China's national conditions. China's aluminum windows and doors industry after twenty years of development, has been fully able and has been designed to develop a variety of grades suitable for China's new products and supporting functional hardware.

In recent years, China's construction and real estate boom, to the Fenestration Industry provides a huge space for development, has now become the world's largest windows and doors market. Strong infrastructure in the country, driven by the industry for aluminum doors and windows and related hardware industry provides a rare opportunity. Since China aluminum windows and doors industry started relatively late, Europe and other countries through the introduction of windows and doors, and through the application of learning in recent years, there are some companies began to design their own doors and windows system suitable for China's national conditions.

How to ensure the quality of the hardness of aluminum

Aluminum temperature setting and control: In general, the temperature and the table show that the temperature has some errors, set the table when the temperature of the furnace according to the actual temperature setting, and pay close attention to temperature fluctuations. Aluminum heat aging: in strict accordance with requirements of the aging process, the holding time should be appropriate to avoid aging or due to aging and cause hardness is not enough. Blank frame, furnace charging

Aluminum extrusion frame can not be too close to the material and the material at intervals, especially small unventilated materials, thick interval larger pipe materials and small materials together in a single box, pipe materials is conducive to such restrictions air circulation. Furnace before charging 6 XXX will be other special alloys and common 6063 alloy aging furnace installed alone, due to production reasons and oven aging, the aging process take special alloys. Of aluminum extrusion, without limitation low hardness before and not as a product of the use, therefore, in general, have improved strength through aging. Typically, aging can be divided into two kinds of natural aging and artificial aging, the current 6 XXX aluminum production is essentially based on the latter.

Aluminum windows and doors leak prevention and control

1, the design and preparation phase

    a) early intervention, to participate in drawings reviewing the design defects, proposed deepening of the design requirements;

    b) structural design characteristics on the basis of engineering calculations strictly according to specifications and design, do not simply apply;

    c) the characteristics of a model based on the engineering construction window, do the preliminary prevention, process control, stage watertight test;

    d) before mass production, and truly physical performance test to determine whether the doors meet the design requirements and performance indicators;

    e) try to use the same manufacturer, same series window profiles, do not simply pieced together, try to use retaining high sash section, increasing sealing doors and windows and adding windows and doors pass locking points;
2, making the installation phase

    a) doors and the wall surrounding the hole should be controlled in the standard gap between 25mm-40mm, the maximum size should be no more than 50mm, the minimum is not less than 20mm, and the outer wall of the window frame at a distance, or should use fine concrete pouring dressing before installation and construction, prohibited the use of inferior masonry, such as mud-brick or mortar directly sintered pad level;

    b) a reasonable choice according to the project situation cement mortar filling method, one first mortar filling the cavity aluminum mounting on the wall and then a second filling; two aluminum frame is fixed before filling mortar. Both methods have advantages and disadvantages, the first chamber to ensure that no form of aluminum hollowing phenomenon, but is easy to produce in the second filling cracks and leaks; second method is easy to form the lower sides of the border and the inevitable dissatisfaction with the form filling hollowing phenomenon;

    c) To control the cement mortar filling cement mortar mix is ​​generally 1:2.5, to ensure the quality of cement mortar, it is recommended to add in cement mortar cement mortar waterproofing agent to improve anti-leakage performance, pay attention to maintenance, to avoid cracking;

    d) border around the outer wall of windows and doors 300mm range, increasing painted two waterproof coating to reduce the chance of water leakage;

    e) face the wind or rain erosion surface to prevent rainwater seeps through the windows and the wall between the filling material, sealing baffles or other appropriate consideration waterproof coating to increase the impermeability;

    f) to leave the junction sash dispensing slot width 5-8mm, inlay Note sealing materials, attention should be clear floating dust, mortar, etc., so that the sealing material and window frames, wall firmly bonded. Also check whether the continuous sealing materials, whether gaps, etc., especially if there is nonporous corner transfer position exists; wall tiles should be used for two or more sealed to avoid the patchwork capillary water penetration;

    g) Adjust ban remains in the doors and windows frame pad, a second time after removal filled with dense, filling attention reliable bonding with the substrate, in addition to clear debris outside the matrix should be moist;

    h) indoor outdoor window sill plate should be less than 20mm is appropriate, and set the downstream slope, drainage flow, to avoid water penetration. Aluminum doors and windows and the exterior have a certain distance, to avoid direct rain erosion.

    i) door and window fittings, materials, specifications, connection method should comply with local "aluminum alloy doors and technical regulations" requirement in a timely manner with concrete or mortar anchor seal, avoid moving under the action of wind load leaving the sealing material cracks.

Electrolytic capacitors to avoid common pitfalls method

Because of its low cost, aluminum electrolytic capacitors have always been a popular choice for the power supply. However, they are limited life, and vulnerable to extreme high and low temperature conditions. Electrolytic capacitors in place on both sides of paper impregnated with electrolyte foil. This electrolyte is evaporated during the life of the capacitor, thereby changing its electrical properties. If the capacitor fails, it will be a vigorous reaction: capacitor formation pressure, forcing it to release a flammable and corrosive gases.
Electrolyte temperature the rate of evaporation is closely related with the capacitor. Operating temperature dropped 10 degrees each capacitor life expectancy doubled. Capacitors rated life is usually at its maximum rated temperature the result. Typical rated life of 1000 hours at 105 degrees Celsius. Selecting these capacitors shown in Figure 1 for the long-life LED bulbs and other applications (LED lifetime of 25,000 hours), capacitor life will become a problem. To achieve 25,000 hours life, this capacitor requires working temperature does not exceed 65 degrees Celsius. The operating temperature is particularly challenging, because in this application, the ambient temperature will exceed 125 degrees Celsius. There are on the market a high temperature rated capacitor, but in most cases, the aluminum electrolytic capacitor LED lamp life will become a bottleneck components.
Temperature dependence of this life you reduce the actual impact of the capacitor rated voltage. Your first thought might be to increase the rated voltage of the capacitor dielectric to minimize the probability of failure. However, doing so causes the capacitor's equivalent series resistance (ESR) higher. Since the capacitor will generally have high ripple current stress, so this will bring additional high resistance internal power dissipation and increase the capacitor temperature. Failure rate increases with increasing temperature. In fact, the aluminum electrolytic capacitor typically use only about 80% of the rated voltage.
When the capacitor temperature is low, ESR increased dramatically. In this case,-40oC, the resistance of magnitude increase. In many ways this will affect the power performance. If the capacitor for switch mode power output, the output ripple voltage magnitude was increased. Further, the ESR and the output capacitor formed above zero frequency, it allows the loop gain is one order of magnitude, thus affecting the control loop. This generates a stable oscillation power. To accommodate this strong vibration, the control loop is usually made great compromise in space, and at higher temperatures.
In short, the electrolytic capacitor is usually the lowest cost option. However, you will need to determine whether the application of its shortcomings adversely affected. Through its work, the temperature you need to consider the length of its life. In addition, you also appropriately reduce the rated voltage, so that you can achieve the lowest temperature operation, thereby obtaining maximum life. Finally, you need to understand the need to use the ESR range, so that you can properly design the control loop, designed to meet the ripple specifications.