What Is The Shrinkage Rate Of Zinc Die Casting?

The shrinkage rate of zinc die casting mainly depends on factors such as alloy material, die casting structure, wall thickness and pouring temperature. The size of the shrinkage rate can be calculated by the following formula:

Factors affecting the shrinkage rate of zinc die casting

Alloy material: Different casting alloys have different shrinkage rates. For example, cast steel has a larger shrinkage rate, while gray cast iron has a smaller shrinkage rate. Silicon can promote the reduction of shrinkage, while sulfur will increase the shrinkage rate.

Structure of die casting: The structure of die casting, such as wall thickness, ribs, etc., will affect the cooling rate and shrinkage.

Pouring temperature: The higher the pouring temperature, the greater the alloy superheat, and the greater the liquid shrinkage. The pouring speed and the re-pouring during the pouring process will also affect the shrinkage of the casting.

Physical and mechanical properties of zinc alloy
Zinc alloy is easy to die-cast at a low melting point (385℃), and has good room temperature mechanical properties and wear resistance. In addition, zinc alloy does not absorb iron, corrode the die, or stick to the mold during melting and die casting.