Characteristics and application of aluminum alloy die castings

Release time:

2023-03-17 11:12

Aluminum alloy die casting has other castings incomparable advantages, such as beauty, weight, corrosion resistance, etc., especially with the lightweight of automobiles, aluminum alloy die casting has been widely used in the automotive industry.

The density of aluminum alloy castings is less than that of cast iron and cast steel, but higher than the strength. Therefore, the use of aluminum alloy castings under the same load conditions can reduce the weight of the structure, so aluminum alloy castings are widely used in the aviation industry and power machinery and transportation machinery manufacturing. Aluminum alloy has good surface gloss, good corrosion in the atmosphere and fresh water, and is widely used in civil instrument manufacturing. Pure aluminum has good corrosion resistance in oxidizing acid media such as nitric acid and acetic acid, so aluminum castings also have certain uses in the chemical industry.

Aluminum alloy die-casting is currently widely used die-casting materials, aluminum alloy die-casting products are mainly used in lamps, automobiles, motors, home appliances, some communication industries, etc., some high-performance, high-precision, high-toughness high-quality aluminum alloy products are also used in large aircraft, ships and other industries with relatively high requirements. The main use is still in the components of some instruments. The main features of aluminum alloy die castings are:

1. Low density, high specific strength.

2. It has good mechanical properties at high temperature and room temperature, especially the impact toughness is particularly good.

3. Electrical and thermal conductivity are very good. The mechanical cutting performance is also very good.

4. The surface has chemically stable, dense structure of alumina film, most aluminum alloys in fresh water, seawater, nitrates and various organic matter corrosion resistance is very good. But this alumina film can be destroyed by chloride and alkali ions.

5. Good die casting performance, good surface roughness and good hot cracking.

Aluminum processing is common, such as screens, aluminum windows, etc. The extrusion molding process, that is, raw materials such as aluminum ingots are melted in the blast furnace and extruded to the mold by the extruder, and steel of various cross-sections can be extruded.

The main properties are determined by strength, hardness and wear resistance according to the national standard GB6063. The advantages are that the weight is only 2.8, no rust, fast design changes, low mold input, and the longest depth is more than 10 meters. The appearance of aluminum processing is bright and dull, and its treatment process adopts anodizing treatment, and the thickness of the surface treatment oxide film reaches 0.12m/m. The wall thickness of aluminum processing is selected according to the optimization of the product design. It is not that the thicker the market, the better, but that it is necessary to design according to the requirements of the cross-sectional structure. It can be uneven at 0.5 ~ 5 mm. The layman thinks that thicker is tougher, but in fact it is wrong.

The quality of the aluminium machined surface also has insurmountable defects (warpage, deformation, black lines, convex and concave, white lines). The high level of designers and the reasonable mold design and production process can prevent such defects from being noticed. The inspection defect should be judged according to the inspection method stipulated by the state, that is, the line of sight 40 ~ 50 cm. Aluminum processing is widely used in furniture: screen skeletons, various hanging beams, table legs, decorative rods, handles, silhouettes and covers, chair tubes, etc., the design and application are changeable!

Although aluminum processing has many advantages, it also has undesirable points.

Unoxidized aluminum is easy to "rust", resulting in reduced performance, and the longitudinal strength is not as good as that of iron products. The abrasion resistance of the surface oxide layer is easier to scratch than the electroplating layer. The cost is high, relatively speaking, the cost of iron products is about 3~4 times higher.

Compared with die-casting alloy and profile processing methods, the equipment used is different. Its raw materials are aluminum ingots (purity of about 92%) and alloy materials, melting furnaces, entering the die-casting machine to form molds. Die-cast aluminum product shapes can be designed like toys, the shapes are diverse, can be easily connected to various directions, high hardness strength, zinc and zinc mixed to make zinc aluminum alloy.


Alloy die casting

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