机械零件的硬车削是一种对未来有很大希望的生产工艺，因为它是提高生产率的有效手段。不需要在软状态下加工产品，通过热处理硬化零件，然后通过磨削提供所需的光洁度和尺寸精度，从而消除了昂贵的磨削操作。这是可能的，因为有改进的硬工具材料（多晶立方氮化硼和陶瓷）和更坚硬的机床。硬车削中切屑形成的性质与常规加工中的切屑形成的性质截然不同。在回顾了这种独特类型的切屑形成的机理以及进行这种加工时不寻常的刀具方向后，我们将根据比能量、所需功率和预期的表面光洁度来解释实验结果。

Hard turning of machine parts is a production process that holds considerable promise for the future since it is an effective means of increasing productivity. Instead of machining a product in the soft state, hardening the part by heat treatment, and then providing the required finish and dimensional accuracy by grinding, the expensive grinding operation is eliminated. This is possible because of the availability of improved hard tool materials (polycrystalline cubic boron nitride and ceramics), and more rigid machine tools. The nature of chip formation in hard turning is quite different than in more conventional machining. After reviewing the mechanics of this unique type of chip formation and the unusual tool orientation for carrying it out, experimental results are interpreted in terms of specific energy, the power required, and the surface finish to be expected.