精密铸件大平面上内浇道设置方法的改进

大平面铸件常在内浇道根部出现过热，在该处产生缩松缺陷。为增大模头与铸件的距离，常用垫蜡块的方法。经生产实践，如蜡块垫在模头上，铸件缩松继续产生；将蜡块改为垫在铸件上之后，缩松消除了。

Improvement of Ingate Design for Large Plain Parts in Investment Castings

There easily exists shrinkage porosity due to superheat of ingate root in large plain parts investment casting.To argue the distance between mold end and castings,the wax pattern block was set.Actual production shows that if the wax pattern is set on wax mold end,the shrinkage is not eliminated,while in turn,wax pattern block is set on the castings,the shrinkage is eliminated.