缸盖罩高真空压铸工艺与普通排气块压铸工艺分析

Defects Analysis of Die-casting of the Cylinder Head Cover Aluminum Alloy by High Vacuum and Common Venting Block Process

缸盖罩外壳产品经过几代的集成和更新后,其压铸工艺变得较为复杂,缺陷种类及位置分布也更为分散。为了减少铸件缺陷,开发前期应用数值模拟,准确地了解铝液流动充型状态与铸件缺陷的分布,缩短了模具的开发周期。压铸开发阶段对缸盖罩铸件分别采用高真空压铸和普通排气块工艺进行试生产,通过对铸件品质的分析,发现高真空压铸工艺可以在压铸速度与铸造压力都较低的情况下获得合格的铸件。

Shell as a part of the engine cylinder head cover,after several generations of product integration and update,its die casting technology has become more complex,so the defect types and location distribution are more dispersed.In order to reduce defects in the production and manufacture process,at the early stage of the development,numerical simulation method was applied to understand accurately the aluminum liquid filling state and the distribution of the casting defects,greatly shortening the mold development cycle.Cylinder head cover shell parts were trial-produced with high vacuum die casting technology and common die casting.Through analyzing casting quality,it is found that the high vacuum die casting can produce the qualified cylinder head cover at the lower injection velocity and pressure.