本文针对冷敲工艺特点，通过测定花键表面的粗糙度和硬度值对冷敲花键表面质量进行定量研究，并观察微观金相组织，对冷敲成形内部组织特点进行研究。实验结果表明：冷敲花键表面成形质量较高，粗糙度Ra达到了7~8级；冷敲过程中，齿形发生加工硬化现象，晶粒被打碎拉长，形成流体状纤维组织沿齿形分布，强度硬度都得以提高。冷敲加工工艺生产出的花键轴综合性能较高。%According to the characteristics of cold rolling,the research on surface quality about spline was done by measuring surface roughness and hardness of spline,and a study was made on the cold rolling's internal organization characteristics by observing microscopic metallographic organization. The experimental results showed that the sur-face forming quality of cold rolling spline is better,and the roughness has reached the level 7 ~ 8. Work hardening occurred on the spline during the process of cold rolling. The grain was broken and elongated,which translated into fluid shape fiber distributing along the spline shape. The strength and hardness were improved. Cold rolling process-ing technology has the advantage of producing the spline shaft with high comprehensive performance.
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