Precision grinding process for gyro motor shaft of dynamic pressure air bearing

Abstract

There are some problems of low accuracy, low efficiency and high cost in the precision machining for gyro motor shaft of dynamic pressure air bearing with high hardness and high brittleness, for the above questions, the research of high precision grinding technology is carried out. Firstly, the diamond grinding wheel is designed by studying the influence of different parameters on workpiece shape, surface quality and specific grinding energy, etc. Secondly, through the orthogonal test, the optimum process parameters affecting the surface roughness, roundness and cylindricity of motor shaft are determined. Finally, the grinding experiments of 20 motor shafts are completed by using the optimal parameters. The results showed that the qualified motor shaft with roundness 0.09μm, cylinder 0.32μm and roughness(Ra) 0.037μm is obtained when the workpiece speed is 308r/min, feed rate is 0.003m/min and grinding depth is 1μm.