精研加工参数对轴承滚道表面残余应力影响

Influence of superfinishing parameters on residual stress of bearing raceway

对7008C轴承内圈滚道以不同精研加工参数进行精研加工,使用X射线应力分析仪对精研加工后的7008C轴承内圈滚道底部表面的周向和轴向残余应力值进行测量。实验结果表明：轴承滚道表面存在的残余应力为残余压应力,滚道底部平均应力值在–266~–438 MPa之间,且在轴承滚道底部表面的周向残余应力值大于轴向残余应力值;油石压力对轴承滚道表层的残余压应力影响显著,增大油石压力能显著提高轴承滚道表层的残余压应力。

The experiments for 7008 Cbearing inner ring superfinishing are carried out with different processing parameters.An X-ray stress analyzer is applied to measure circumferential and axial residual stress at the bottom of the raceway of 7008 Cbearing inner ring.The results show that the residual stress on bearing raceway surface is compressive stress,the average value of which ranges from–266MPa to–438 MPa.It is also shown that the circumferential residual stress is larger than the axial residual stress.In addition,the force pressed on the oilstone has a significant influence on the residual compressive stress of bearing raceway surface,thus the increase of the former leading to an increase of the latter.