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1·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。

2·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。

3·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。

4·Based on the heat exchange characteristic of permanent mould casting, the thermal resistance of coating level becomes the main thermal resistance of the heat transfer.

基于金属型铸造热交换的特点，涂料层的热阻成为传热的主要热阻。

5·A new method of balanced cooling permanent mould was described. The effect of balanced cooling on the piston quality is discussed. The key to improve quality is to reinforce the cooling.

提出了活塞铸造中模具均衡冷却的新方法，讨论了均衡冷却对活塞质量的影响，指出合理加强冷却是获取高质量活塞的关键。