影响活塞杆加工精度的因素及对策

Factors and Countermeasures Influencing Machining Precision for Piston Rod

活塞杆结构比较简单,但长径比很大,属于细长轴类零件,刚性较差,为了保证加工精度,在车削时要粗车、精车分开,而且粗、精车一律使用跟刀架,以减少加工时工件的变形,在加工两端螺纹时要使用中心架,渗氮处理时,非氮化部分均涂防氮层进行保护,通过加工工艺的改进和工序的控制及切削用量的改变解决了活塞杆的加工精度问题。

The structure of piston rod is relatively simple, but its ratio of length to diameter is quite large, which make it become slender shaft part with low stiffness. In order to obtain necessary fabrication precision, rough machining and fine machining should be carried out separately, and in both processes follower rest should be utilized so as to reduce the deformation occurred in machining. In the process of machining the thread at two ends, center rest should be used. Finally, in the process of nitridation, non-nitriding portion is needed to coat with anti-nitrogen. With the improvement in fabrication process, the procedure control and the change in machining quantity, the machining precision for piston rod have been determinedly obtained.