铝-硅合金砂型铸件改为压铸生产的工艺改进

Process improvements on Al-Si alloy casting produced by die-casting instead of sand mold casting

通过一个铝-硅合金端盖压铸件设计实例，探讨了铝-硅合金砂型铸件改为压铸生产时，要在合金化学成分、熔炼工艺和铸件的工艺性能等方面，根据压铸工艺的特点对铸件整个生产工艺进行改进，以满足压铸生产的特殊要求。压铸铝-硅合金中ω（Fe）可以达到1．0％。ω（Fe）〈0．150%时,ω（Mn）要达到0．5％-0．8％，以防止粘模。对于不太重要的铝合金压铸件可以省略熔炼过程中的变质处理过程，通过合理设置加强筋、减少壁厚、减小拔模斜度等措施，改善压铸件的结构工艺性。

Researched the improvements of process when a Al-Si alloy casting produced by die-casting instead of sand mold casting with a cover die-casting example. Main improvements relate to alloy chemical composition, melting process and casting structure based on the specialties of die-casting process. In Al-Si alloy, ω（Fe） 〈 1.0% ,when ω（Fe） 〈 0. 15%, ω（Mn） = 0.5% - 0.8%. It can reduce the modification process when produce the normal die-casting. They can improve the processability of product structure of die-casting,by properly arranging the ribs, reducing the die-casting wall thickness and enlarging the draft angle etc.