一、概况 80年我厂新添置4台SC7120A螺纹仿形车床,加工对象是我厂生产的三牙轮钻头(开采石油用)的锥度螺纹部份(见图1)。该机床有二只刀架,一只为车丝刀架,另一只为仿形刀架。仿形刀架只能装一把车刀,按样板仿形出外锥体,仿形工作的顺序如图2所示。 I. Introduction 80 years ago, our factory newly purchased 4 sets of SC7120A thread profiling lathes. The object of machining is the taper thread part of the three roller cone bits (for petroleum exploitation) produced by our factory (see Figure 1). The machine has two turrets, one for the turret and the other for the profile turret. Copy knife can only be fitted with a lathe knife, according to the model copy out of the cone, the order of the work profile shown in Figure 2.