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对于内燃机车柴油机气缸—活塞组的重要零件来说,强化其铸造生产工艺过程就需要采用高生产率的铸造工艺。球墨铸铁活塞环毛坯以前是在干粘土砂型中铸造的。这种铸造方法可以保证铸件在铸型中凝固和冷却时散热比较均匀,即在结晶时温度梯度不大。这在实际上可在零件的任何截面上获得具有所需性能的金属显微组织和宏观组织。但是,干粘土砂型铸造法生产效率低,需要占用较大的生产场地面积和消耗大量的造型和制芯材料。在这种情况下,铸件的合格率为50％～70％,铸造车间含尘量高,劳动条件恶劣,不能满足现代卫生保健的要求。全苏铁路运输科学研究院同许多科研机
For important components of diesel engine cylinder-piston assemblies in diesel locomotives, strengthening the casting production process requires the use of a high-productivity casting process. Nodular cast iron piston ring blanks were previously cast in dry clay sand. This casting method can ensure that the casting solidification and cooling in the mold cooling more uniform, that is, the temperature gradient is not large in the crystallization. This makes it practically possible to obtain metallic microstructures and macrostructures with the required properties on any section of the part. However, the dry clay sand casting method of production efficiency is low, need to occupy a larger production space and consume a large amount of modeling and core material. In this case, the passing rate of castings is 50% ~ 70%, the dust content in casting shop is high and the working conditions are harsh, which can not meet the requirements of modern health care. All Su-Railway Transportation Research Institute with many research machines