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编订机械加工工艺时,遇到有关热处理问题,往往难以解决,有时因对热处理所产生的变形因素考虑不周,造成零件返修或报废。为了有利于冷、热加工工艺人员对加工过程相互了解,根据工厂热处理设备及实际情况,对所遇到的一些热处理变形问题进行了初步搽讨。一、对调质零件的工艺要求 1.调质前的机械加工,应根据零件的材料、几何形状和性能而定。原则上应加工至零件接近成品尺寸后进行调质。如果加工余量过大,则不仅将调质后性能优越的外部金属加工掉,而且引起表面较大的切削
The preparation of mechanical processing technology, encountered the heat treatment problems, often difficult to solve, and sometimes due to deformation caused by heat treatment considerations, resulting in parts repair or scrapped. In order to facilitate the cold, hot processing technology staff on the process of mutual understanding, according to the factory heat treatment equipment and the actual situation, the encounter some of the heat treatment deformation preliminary paint. First, the quenched and tempered parts of the process requirements 1. Pre-quenching mechanical processing, should be based on the parts of the material, geometry and performance may be. In principle, the parts should be machined to the finished product size and then tempered. If the machining allowance is too large, not only after quenching and tempering the performance of the external metal processing off, and cause a larger surface cutting