Abstract: In view of the difficulty in obtaining the low surface roughness and surface waviness of the bearing rings for the traditional machining method, a machining method using ultrasonic assisted internal grinding was proposed to improve the surface quality of the bearing rings. Based on the analysis of single abrasive grain trajectory in ultrasonic internal grinding, a theoretical model of surface roughness was established. The effects of various machining parameters on the surface quality of the bearings were studied by ultrasonic inner grinding of the bearing rings. The results demonstrate that the ultrasonic internal grinding significantly improves the surface quality of the bearings. Increase of the ultrasonic amplitudes may reduce the surface roughness and the surface waviness will decrease first and then increase. As the grinding wheel speed increases, the surface roughness and surface waviness will reduce first and then increase. Increased grinding depths and feed rates will increase surface roughness and surface waviness, but ultrasonic internal grinding may reduce the increases both of them.

Key words: bearing ring, ultrasonic internal grinding, abrasive grain trajectory, surface roughness, surface waviness

摘要： 针对传统加工方式难以获得轴承套圈较小的表面粗糙度和表面波纹度的问题，采用超声辅助内圆磨削的加工方法来改善轴承套圈的表面质量。基于超声内圆磨削单颗磨粒运动轨迹分析，建立了表面粗糙度的理论模型，通过对轴承套圈进行超声内圆磨削试验，研究了各个加工参数对轴承表面质量的影响。研究结果表明：超声内圆磨削加工方法可明显改善轴承的表面质量；增大超声振幅可减小表面粗糙度而表面波纹度会先减小后增大；随着砂轮转速的增大，表面粗糙度及表面波纹度会先减小后增大；磨削深度和进给速度的增大会使表面粗糙度及表面波纹度增大，但超声内圆磨削可减小它们的增加量。

关键词: 轴承套圈, 超声内圆磨削, 磨粒运动轨迹, 表面粗糙度, 表面波纹度