Abstract: To obtain high-quality ring rolling surface morphology, improve shape accuracy and improve bearing service performance. GCr15 ring raceway was polished by force rheological polishing technology. The orthogonal experimental scheme was designed and the range of experimental parameters was confirmed. The effects of polishing speed, abrasive particle size and abrasive concentration on material removal rate(MRR) and surface roughness Ra were studied. The signal-to-noise ratio of the datum was analyzed, and the variance analysis method was used to obtain the influence weight of the processing parameters on the processing results, and the optimal processing parameters were obtained. The shape accuracy of the rings before and after the optimal parameter processing was compared, and the force rheological processing model was established to analyze the improvement mechanism. The polishing speed has the most significant effects on the MRR and surface roughness, and the abrasive particle size and concentration have relatively low effects. Under the optimal processing parameters(polishing disc speed 90 r/min, abrasive particle size 2.5 μm, concentration 6%) polishing 90 min, the value of surface roughness Ra decreases from the initial 322 nm to 12.982 nm, and the variance do not exceed 2.158 nm2. The roundness decreases from about 3.05 μm before polishing to about 1.67 μm. The simulation model reveales that the reason for the improvement of shape accuracy is that the protruding part is easy to form a higher MRR. Polishing the bearing ring raceway with the optimized force rheological polishing processes may improve the surface quality and shape accuracy of the bearing ring raceway effectively, and provide a feasible solution for high-quality processing to improve the service performance of the bearings.

Key words: force rheological polishing, bearing, ring, ultra-precision machining, shear thickening

摘要： 为获得高质量的套圈滚动面形貌，改善形状精度，提高轴承服役性能，采用力流变抛光技术设计了正交试验方案，确认了试验参数范围，研究了力流变加工过程中抛光速度、磨粒粒径和磨粒浓度对材料去除率（MRR）和表面粗糙度Ra的影响规律。对数据进行信噪比分析，采用方差分析方法得到工艺参数对加工结果的影响权重和最优工艺参数。对比了最优参数加工前后套圈的形状精度，建立了力流变加工模型来分析精度改善机理。结果表明，抛光速度对材料去除率和表面粗糙度的影响都最为显著，磨粒粒径和浓度的影响相对较低。在最优工艺参数（抛光盘转速90 r/min，磨粒粒径2.5 μm，质量分数6%）下抛光90 min，Ra从初始的322 nm下降到12.982 nm，且方差不超过2.158 nm2，平均圆度从抛光前的约3.05 μm下降到约1.67 μm。仿真模型揭示了形状精度改善的原因是凸出部位易形成更高的材料去除率。研究结果表明，采用优化的力流变抛光工艺可有效提高轴承套圈滚道的表面质量和形状精度。在提高轴承服役性能的高质量加工方面，力流变抛光技术提供了一种可行方案。

关键词: 力流变抛光, 轴承, 套圈, 超精密加工, 剪切增稠