在普通车床上加工大型非标螺母，一直是机械加工的难题。一方面，由于这类螺纹导程大、螺旋槽深，所加工的螺纹表面粗糙度难以保证；另一方面，加工时车床大拖板移动速度快，每次退刀难度大，经常发生断刀以及刀架与工件碰撞等事故。针对这些情况，我厂在承接南京汽车制造厂委 In general lathe machining large non-standard nuts, machining problems have been. On the one hand, due to such thread lead is large, deep spiral groove, the thread surface roughness of the processing difficult to guarantee; the other hand, processing lathe large carriage moving fast, each retraction difficult, often broken knife As well as the tool holder collision with the workpiece and other accidents. In response to these circumstances, I plant to undertake Nanjing Automobile Manufacturing Plant