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目前国内各轴承厂的毛坯制造绝大多数采用热锻工艺,即热套锻或平锻有时再加扩孔。锻件精度低,氧化脱碳严重,加工余量大,材料利用率低,劳动条件差。据统计,全国轴承行业的平均材料利用率仅38％,每年耗费大量高级钢材和能源。温冷挤压是先进的少无切削新工艺,产品精度高、质量好,可以节约钢材,大大提高经济效益。国内很多工厂和研究单位都曾研究过采用温冷挤压工艺制造轴承环毛坯。
At present, the vast majority of the domestic manufacturers of rough bearing manufacturing using hot forging process, that is, hot forging or flat forging sometimes re-expansion. Forging low accuracy, serious oxidation and decarbonization, processing margin, low material utilization, poor working conditions. According to statistics, the average bearing material utilization rate of the national bearing industry is only 38%, consuming a lot of high-grade steel and energy every year. Cold extrusion is advanced less no cutting new technology, high precision products, good quality, you can save steel, greatly improving economic efficiency. Many domestic factories and research institutes have studied the use of warm and cold extrusion process to produce bearing ring blank.