目前机车柴油机活塞环大都是用灰铸铁和球墨铸铁来制造。铸造采用粘土砂型单体铸造法或者筒体铸造法,或者在有内衬的金属模内离心浇铸。为了获得活塞环材料所需的组织,最乐意采用的方法是在有内衬的金属模内进行筒形铸造,因为铸件的均匀冷却能获得理想的金属基体和石墨显微组织,这基本上决定了活塞环运用性能。然而内衬金属模筒体铸造法生产率低,需要较大的造型面积以及造型材料消耗量大,劳动卫生保健条件差。高效率连续循环冷冻铸造法可认为是一 At present, locomotive diesel piston rings are mostly made of gray cast iron and ductile iron. Casting using sand-type clay casting method or cylinder casting method, or in a lined metal mold centrifugal casting. In order to obtain the desired organization of the piston ring material, the most favored method is cylindrical casting in a lined metal mold, since the uniform cooling of the casting gives the desired metal matrix and graphite microstructure, which basically determines Piston ring performance. However, the casting mold with lining metal mold has low productivity, requires large molding area and consumes large amount of modeling materials, and has poor sanitary conditions. High-efficiency continuous circulation of frozen casting method can be considered as one