我厂生产汽车零件中的油嘴,管接头和汽阀的螺纹,现采用牙形角为60°的圆锥管螺纹。以前这种螺纹是在车床搬斜车头或用小刀架车,这种加工方法,操作者劳动强度大,产品质量得不到保证,每班最多只能车40～50件,工效很低。无产阶级文化大革命以来,我厂广大革命职工下定决心,要改革这种落后的工艺。在总结普通螺纹滚丝加工实践的基础上,提 I plant the production of auto parts in the nozzle, pipe joints and steam valve thread, the use of tooth angle is 60 ° cone pipe thread. In the past, the thread was lathed in the lathe or with a knife carriage, this processing method, the operator labor-intensive, product quality can not be guaranteed, the class can only be a car 40 to 50 pieces, the work efficiency is very low. Since the Great Proletarian Cultural Revolution, the revolutionary workers and staff of our factory have made up our mind to reform this backward craft. On the basis of summarizing the practice of ordinary thread rolling, mentioning