有些齿轮在渗碳淬火过程中,常常由于装箱时放置不妥当或者加热不均匀,而使里孔发生变形;特别是里孔比较大而外圆比较小的齿轮,里孔变形更利害,以致影响了齿轮外圆的精度。我厂在热处理截煤机上的歪轮(齿轮)时,改进一种用心轴校正里孔变形的方法,取得了很好的效果。现在把处理经过详细介绍如下。(一)工件的技术条件——工件是截煤机上的歪轮(图1),材料 Some gears in the carburizing and quenching process, often due to improper placement or heating uneven packing, leaving the hole deformation; especially in the hole is relatively large and small cylindrical gear, the hole in the more detrimental to deformation, resulting in Affect the accuracy of gear cylindrical. I plant in the heat treatment of coal cutter crooked wheel (gear), the improvement of a mandrel shaft hole correction method, and achieved good results. Now deal with the details as follows. (A) the technical conditions of the workpiece - the workpiece is a caster pulley (Figure 1), material