Zinc alloy die casting in the structure and die casting process allows, of course, aluminum alloy is more cost-effective. Because the proportion of zinc alloy is about 2.6 times of that of aluminum alloy, but the price is the same, so in terms of material cost, zinc alloy die castings are two or three times more expensive than aluminum alloy die castings.
Zinc alloy die casting can be compensated by the low cost of the pressure facilities in the processing machine shed, because this suppression device greatly reduces the forging load. It has been suggested that superplastic zinc alloy can be used in some application areas, but it has the defect of long forming time. Therefore, with the stagnation of superplastic zinc alloy, people expect to stop some economically meaningful process, and no longer use the Superplasticity of the alloy to consume fine standard parts The forming load required is similar to that of conservative commercial alloy when it is already in the scope of general hot working. The market demand for superplastic zinc alloy is increasing because superplastic zinc alloy is in good mechanical function at room temperature.
In order to save cost, many enterprises want to replace zinc alloy die casting with aluminum alloy, but some characteristics can not be replaced, because the strength, hardness and molding performance of zinc alloy are better than aluminum alloy.
Introduction of process difference of zinc alloy die casting
The technological difference lies in: stamping is the cold extrusion processing of thin plates; cold forging is the molding processing of materials below the recrystallization temperature; hot forging is the molding processing of materials above the recrystallization temperature; zinc alloy die casting plants think that die casting and injection are similar, and liquefied metal is cooled in the mold. As for the machining accuracy, also depends on the design requirements, generally speaking: Die Casting and cold forging are relatively high, but the quality is reliable.
After the middle of the 20th century, zinc alloy die casting has new technologies, such as wet sand high pressure molding, chemical hardening sand molding and core making, molding and other special vacuum casting, shot blasting and other new technologies. With high shape, the casting has good dimensional accuracy and surface finish, and the working conditions and environmental hygiene of the foundry are also greatly improved.
The role and influence of each element in zinc alloy die casting.
1. Aluminum
Aluminum content is generally in the range of 3.5-4.5%. Aluminum can reduce the corrosion of molten zinc on ferrous metals, refine grains and strengthen the alloy. With the increase of aluminum content, the strength and impact value of the alloy are significantly improved. When the aluminum content is more than 5%, the alloy becomes brittle. When the aluminum content is lower than 3.5%, the fluidity and mechanical properties decrease, and the hot cracking tendency and shrinkage increase.
2. Copper
In die casting zinc alloy, copper can significantly inhibit intergranular corrosion and improve the hardness and strength of the alloy. When the copper content is more than 1.5%, the corrosion resistance is no longer improved. When the copper content is more than 4%, the impact strength decreases.
3. Magnesium
It has little content in die casting zinc alloy, but it can obviously inhibit intergranular corrosion, refine grain size and improve hardness. Generally, 0.04% is suitable. When the content of Mg is more than 0.08%, the alloy will have hot brittleness and reduce the impact strength and filling ability.
The above is the role and influence of each element in zinc alloy die casting
The quality standard of zinc alloy die casting is the life of an enterprise, the core of improving the competitiveness of the enterprise, and an important condition for improving the economic benefits of the enterprise. Therefore, improving the quality of zinc alloy die castings is very beneficial to the economic benefits of the die-casting enterprises and the social benefits of reducing the waste of resources.
