近代机械产品的发展,要求零件性能好、精度高。所谓性能好,系指机械在苛刻(高温、高压、高速和重载等)条件下工作时,零件本身所具有的承载能力强;高精度,系指保证机械运转时具有高精度的构件尺寸和相关零件的良好配合。如所周知,影响和决定零件性能和精度的因素较多,其中,主要包括设计结构、材料选择、制造工艺以及使用条 The development of modern mechanical products, parts performance requirements, high precision. The so-called good performance, refers to the mechanical work under harsh conditions (high temperature, high pressure, high speed and heavy load, etc.), the parts themselves have a strong carrying capacity; high precision, refers to ensure the operation of machinery with high precision component size and Related parts of the good match. As we all know, the factors that influence and decide the performance and precision of parts are more, among them, mainly include the design structure, material selection, manufacturing process,