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用轴承钢管冷冲切——冷挤压轴承套圈是一种能够大量节约轴承钢并有较高劳动生产率的毛坯生产方法,经过冷挤加工的套圈精度高,可以达到无切屑（如向心球轴承外圈的内径）或少切屑（套圈留量,外径1～1.5毫米,内径1～2毫米,高度2.5毫米）因而也大大地提高了车加工效率。自一九七○年下半年正式投产至今我厂已经成功地用冷冲切、冷扩和冷挤的方法加工轴承套圈7个型号700万件。材料利用率由原来热锻（平
Cold punching with bearing steel pipe - Cold-extruded bearing ring is a kind of rough production method which can save a lot of bearing steel and has high labor productivity. High precision ferrule after cold extrusion can reach no chip The inner diameter of the ball bearing outer ring) or less chip (ring retention, outer diameter of 1 to 1.5 mm, diameter of 1 to 2 mm, height of 2.5 mm) and thus greatly improve the efficiency of car machining. Since the second half of 1970 formally put into operation I plant has been successfully used cold punching, cold expansion and cold extrusion method of processing seven kinds of bearing rings 7 million. Material utilization by the original hot forging (flat