在高温下长时间保温去除应力后的锻件曲轴,在粗加工时发现,曲轴主轴径的跳动超差,无法满足加工要求。经分析得出:曲轴在长期放置中,工件内部残余应力重新分布,并通过工件形变得以释放。通过调整热处理工艺以及校直方法,从而有效去除应力,实现了对大中小型曲轴热处理变形的控制。 Forging crankshaft after heat stress removal for a long time at high temperature, it is found during roughing that the main shaft diameter of the crankshaft exceeds tolerance and can not meet the machining requirements. The analysis shows that: when the crankshaft is placed for a long time, the residual stress in the workpiece is redistributed and released by the deformation of the workpiece. By adjusting the heat treatment process and straightening method to effectively remove the stress, to achieve large and small crankshaft heat treatment deformation control.