我厂在C6163车床上加工挤塑机螺杆。螺杆外径90毫米,导程72毫米。螺杆底径的锥度用移动尾座来调整,由鸡心夹头带动螺杆转动(见图1)。螺纹经粗铣后,用高速钢车刀低速进行半精车和精车。当车螺纹的正面即A面时,车刀经常扎入工件,轻则影响工件质量,重则打刀甚至损坏工件,操作时精神十分紧张。为什么车螺纹正面时会扎刀呢?我们认为主要是由于切削力的作用,使鸡心夹头拨杆、螺杆等弹性变形而产生一个扭转角,以致在螺杆的切削部分有 I plant in the C6163 lathe processing extruder screw. Screw diameter 90 mm, lead 72 mm. Screw bottom diameter of the taper with the tailstock to adjust the move, the heart of the screw drive Chuck (Figure 1). After the thread roughing, with a high-speed steel turning tool for low-speed semi-fine car and fine car. When the front of the thread is A surface, the lathe often plunge into the workpiece, ranging from the impact of the quality of the workpiece, the weight is even hit the workpiece or even damage, the operation is very tense spirit. Why does the thread on the front of the car threading it? We think that is mainly due to the role of cutting force, the chicken heart lever lever, screw and other elastic deformation and produce a twist angle, so that the cutting part of the screw