The resin-coated sand lined permanentmould 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。
2
Through the adjustment of coating formula and thickness, the service life and the casting quality of permanentmould 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。
3
The permanentmould centrifugal casting process used for production of valve seat for internal combustion engine and the material of casting was described.