机械产品在设计过程中,为了确保整机性能参数,经过必要的验算和综合分析后,针对不同工况条件的零件,选用与其相适应的材质,规定热处理和表面处理的要求,以通过机加工,热处理和表面处理,来达到零件应具有的尺寸与形位精度及所需的机械性能和物理特性。这就涉及冷、热、表三者在整个工艺中协调与统一。一、在机加工艺中对预先热处理的考虑 Mechanical products in the design process, in order to ensure the performance parameters of the machine, after the necessary checking and comprehensive analysis, for different working conditions of parts, select the appropriate material, the provisions of the heat treatment and surface treatment requirements, through machining , Heat treatment and surface treatment, to achieve parts should have the size and shape accuracy and the required mechanical properties and physical properties. This involves cold, heat, table three in the entire process of coordination and unity. First, in the machining of the pre-heat treatment considerations