在加工液压支架用油缸时,发现采用推镗滚压工艺加工出的缸筒内径圆度较差,在粗镗和滚压加工工序间增加回火工序并不能使情况改观,这说明缸筒圆度的变形主要来自滚压加工阶段。缸筒在热处理后圆周方向存在的硬度差异导致在滚压加工时圆周方向发生不同程度的弹塑性变形,当外加载荷卸除后发生不均匀回复导致里孔圆度差。通过分析发现,控制热处理过程能够缓解该问题。 In the processing of hydraulic support cylinder, found that the use of push Boring rolling process of the cylinder bore diameter round poor, roughing and rolling process to increase the tempering process and the situation can not be changed, indicating that the cylinder round Degree of deformation mainly from the rolling stage. The differences in the hardness of the cylinder after the heat treatment in the circumferential direction lead to different degrees of elastic-plastic deformation in the circumferential direction during the rolling process, resulting in the difference in the roundness of the inside hole when the unloading occurs. Through the analysis found that the control of the heat treatment process can alleviate the problem.