在车床上进行高速切断工序,有很大的困难,尤其当毛坯的直径相当大的时候。发生困难的原因是:在重的切削条件下切屑排出受到阻碍,热量集中在切削区内很小的部分,以及不利於切屑形成等等。因此高速切断时车刀经常损坏。 生产革新者,在高速切断工序上已经获得某种良好的结果。例如 It is very difficult to carry out the high-speed cutting process on the lathe, especially when the diameter of the blank is quite large. The reason for the difficulty is that chip discharge is hindered under heavy cutting conditions, heat is concentrated in a small part of the cutting area, and chip formation is not good. Therefore, high-speed cutting tool often damaged. Production innovators have achieved some good results in high-speed cutting processes. E.g