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.