Production of high-quality, economic die castings, in addition to a reasonable casting structure, perfect die casting die, and good die casting machine, but also must choose the appropriate die casting alloy. CAMEL dedicated designers in the selection of die casting alloy must consider the die casting stress state, working environment, production conditions, and economic 4 aspects, must also consider the alloy itself comprehensive properties.
Die casting alloys selection generally follows the following principles.
1. Sufficient strength and plasticity at high temperatures, no or less thermal embrittlement.
2. Small crystallization temperature range.
3. Sufficient fluidity when the superheat is not high.
4. Small shrinkage.
5. Good physical and chemical properties - wear resistance, corrosion resistance, electrical conductivity, and thermal expansion, etc.
6. Good processability.
Types of die casting alloys
Die casting alloys are divided into non-ferrous alloys and ferrous alloys, currently widely used non-ferrous alloys, classified as follows
Die casting non-ferrous alloys
Low melting point alloy: lead alloy, tin alloy, zinc alloys.
Comparison of the properties of various die casting alloys
The property varies from "1" to "5". "1" means the most desirable, and "5" means the worst.
Main alloy material of die casting
Among them, the density of die casting aluminum alloy is about 2.7g/cm3, which can also be called light metal, and its property characteristics are very suitable for the die casting process. Aluminum alloys is the most used alloy for die casting. Die casting aluminum alloy has the characteristics of low density, high specific strength, good corrosion resistance, wear resistance, good thermal conductivity, good electrical conductivity, good cutting properties, etc.
The die casting process is accompanied by a fast solidification rate, making the die casting alloy slightly better than gravity casting and casting alloys with the same chemical composition. yl112 alloy has better machinability. The 518 alloy with magnesium as the main alloying chemical element has the best machinability. The A390 alloy with high silicon content and incipient silicon phase have the worst machinability.