基于立式圆台磨削的Si_(3)N_(4)套圈磨削机理与工艺研究

Research on Grinding Mechanism and Technology of Si_(3)N_(4)Ring Based on Surface Grinding Machine with Round Table

轴承套圈端面形位公差直接影响轴承的精度,为提高氮化硅套圈的加工精度,对套圈端面的宽度变动量进行研究。在立式圆台磨削方式下,采用正交试验,确定各因素对套圈宽度变动量影响的主次顺序,优化获得套圈端面的最佳加工工艺参数;后通过单因素试验,探究单一磨削参数对宽度变动量的影响规律。主轴进给速度对氮化硅套圈宽度变动量影响最为显著,砂轮转速次之,工件转速影响最小;氮化硅套圈宽度变动量随进给速度的增大而增大,随工件转速和砂轮转速的增大先减小后增大;降低进给速度,有利于减小裂纹及凹坑缺陷的产生,提高套圈端面表面质量。在最佳加工工艺参数砂轮转速为800 r/min、进给速度为5μm/min、工件转速为55 r/min下,可获得氮化硅套圈宽度变动量≤6μm,实现氮化硅轴承套圈高效精密加工。

The geometric tolerances of the end face of the bearing ring directly affects the grade accuracy of the bearing.In order to improve the machining accuracy of the Si_(3)N_(4)ring,the width variation of the end face of the ring is studied.In the vertical table grinding method,the orthogonal test was used to determine the primary and secondary factors affecting the width variation of the ring,and the optimum machining parameters of the ring face were obtained.After that,the influence of single grinding parameter on width variation was investigated by single factor test.The spindle feed speed has the most significant influence on the width variation of the Si_(3)N_(4)ring,followed by the grinding wheel speed,and the workpiece speed has the smallest influence.The width variation of the Si_(3)N_(4)ring increases with the increase of the feed speed,first decreases and then increases with the increase of the workpiece speed and the grinding wheel speed.Reducing the feed speed is beneficial to reduce the crack and pit defects and improve the surface quality of the end face of the ring.When the grinding wheel speed is 800 r/min,the feed speed is 5μm/min,and the workpiece speed is 55 r/min,the width variation of Si_(3)N_(4)ring is less than 6μm,and the high efficiency and precision machining of Si_(3)N_(4)bearing ring is realized.