我厂从1970年开始生产讥车用12V175型柴油机的活塞环。当时的生产工艺是铸造筒形毛坯,加工后用热定型的方法获得活塞环的弹力。这样制成的活塞环,不仅成品率较低,而且产品的质量较差。它的金相组织较粗、耐磨性差、弹力消失快、变形大、容易折断。为了改变这种状况,提高活塞环的综合性能,于1975年改为单体铸造、椭圆加工工艺生产。但在第一批单体铸造活塞环装车应用后,不但没有改变活塞环不耐磨的缺点,还出现了偏磨和普遍拉缸的现象。经过与国内外同类产品的分析、检查和比较,找出了影响活塞环耐磨性能和造成拉缸的主要因素:1.活塞环的弹力偏大; I plant from 1970 to start production of car with 12V175 diesel piston ring. At that time the production process is casting cylindrical blank, after processing the heat setting method to obtain the elastic ring. Piston ring made in this way, not only the yield is lower, but the quality of the product is poor. Its coarse microstructure, poor wear resistance, elastic disappear fast, large deformation, easy to break. In order to change this situation and improve the overall performance of piston rings, in 1975 changed to single-casting, oval processing technology. However, after the first batch of applications for casting piston rings, not only did the piston rings not wear the shortcomings of wear resistance, but also partial eccentric wear and general pull of cylinders were observed. After analyzing, checking and comparing with similar products both at home and abroad, the main factors affecting the wear resistance of the piston ring and the pulling cylinder are found out: 1. The elastic force of the piston ring is too large;