法兰叉头、焊接叉头用数控车加工，保证定位止口公差在H7-H9之间，保证零部件同轴度在0.1mm以内，从而保证整轴可以平稳运行、不跳动。

　　The flange fork head and the welding fork head are processed by CNC machine to ensure the positioning tolerance between H7-H9 and ensure the coaxiality of the parts within 0.1mm, so that the whole shaft can run smoothly without jumping.