各种机械零件除了要求有一定的硬度与机械性能外,还要求零件配合表面有一定的表面性能,如几何精度及表面粗糙度等。零件的硬度与机械性能是由材料决定,通过选择不同材料并配以不同的热处理来得到不同的硬度与机械性能以满足设计要求。而零件的表面性能(形位公差,几何精度,表面 In addition to a variety of mechanical parts require a certain degree of hardness and mechanical properties, but also requires parts with the surface of a certain surface properties, such as geometric accuracy and surface roughness. Parts hardness and mechanical properties are determined by the material, through the choice of different materials with different heat treatment to get different hardness and mechanical properties to meet the design requirements. The part surface properties (form tolerance, geometric accuracy, surface