The resin-coated sand lined permanent mould casting process was adopted to increase density and dimensions accuracy of castings.
为提高铸件致密度和尺寸精度，采用覆砂铁型铸造工艺。
Through the adjustment of coating formula and thickness, the service life and the casting quality of permanent mould could be enhanced.
通过调整涂料的配方与厚度，提高金属型的使用寿命和铸件的品质。
The permanent mould centrifugal casting process used for production of valve seat for internal combustion engine and the material of casting was described.
叙述金属型离心铸造内燃机气门座的工艺方法和材料特点。
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