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上海螺帽八厂是1970年转产轴承的小厂。全厂革命职工怀着为伟大领袖毛主席争光,为伟大社会主义祖国争光的雄心壮志,决心在打轴承翻身仗的战斗中为人民立新功。在厂党支部、革委会的领导下,学习大庆精神,大搞群众运动,组织设备会战,大搞技术革新,并利用原来生产光六角螺帽的特点,因地制宜,初步试验成功203套圈毛坯冷挤压新工艺。 冷挤压工艺过程是: 1.棒料下料后,经酸洗、去除表面氧化皮、中和后,在60吨冲床上将毛坯放入下模内（如图所示）,下模有圆锥形内孔,其
Shanghai Nut eight factory is the 1970 bearing small plant. With the ambition of winning glory for Chairman Mao as the great leader and winning glory for the great socialist motherland, the entire factory revolutionary workers are determined to make new contributions to the people in the battle of hitting the bearings to turn over them. Under the leadership of the Party branch and the Revolutionary Committee of the factory, we have learned the spirit of Daqing, vigorously promoted the mass movement, organized equipment battles, vigorously promoted technological innovation, and utilized the original features of producing hexagonal nuts to suit the local conditions. Cold extrusion of new technology. Cold extrusion process is: 1. After the bar material, pickling, remove the surface scale, after neutralization, the blank on the 60-ton punch on the lower mold (as shown), the lower mold Conical bore, its