並列摘要
In conventional die casting process, a large amount of gas will be trapped in the melt when the melt fills the die cavity. The trapped gas may form porosities and cause large variance of mechanical properties. So conventional die castings are not used in structural parts that need to bear large load. Conventional die castings cannot be welded or heat-treated because the trapped gas will be bubbling when heated. Recently, the technology of ＂high vacuum die casting＂ has been developed, which reduces the air content of castings below 5 cc/100 g Al by evacuating the die cavity so that the mechanical properties of die castings are stable and die castings can be welded and heat-treated. This article uses a snow mobile part as example to introduce the development of a high vacuum die casting. The development includes die casting design, gating system design and filling simulation, die casting machine configuration and the result of die trial.