关键词: 力流变抛光, 轴承, 套圈, 超精密加工, 剪切增稠

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