强化研磨轴承套圈残余应力的分析

Analysis of Residual Stress in Bearing Rings of Reinforced Grinding

为了得到残余应力在深度方向的分布关系,对6组不同强化研磨加工时间下的试样进行了金相分析,推导出了强化研磨时间对强化层厚度的影响规律。经过SEM分析,对强化层进行了分区,解释了强化研磨产生残余应力的实质原因。然后对强化研磨残余应力场进行检测,并对应力释放造成的影响通过弹性理论计算并加以修正。结果表明强化研磨工艺喷射比较均匀,随着测量深度地增加,残余应力值随之增加。在30μm深度以上,残余压应力衰减很快,在120μm深度左右,基本上没有残余应力,在150μm^180μm之间,残余应力会由压应力转变为拉应力。

In order to get the distribution relation of residual stress in depth direction,By means of metallographic analysis of 6 groups of samples with different strengthening grinding time,The influence of the reinforced time on the thickness of the strengthening layer was deduced,The strengthening layer was divided after SEM analysis,The essential reason of the residual stress caused by the enhanced grinding is explained,Then,the residual stress field of reinforced grinding is measured,And the effect of stress release is modified by elastic theory,The results show that the jet is more uniform,and the residual stress increases with the increase of measurement depth. At the depth of 30 μm,the residual compressive stress attenuates rapidly,and there is no residual stress in the depth of about 120 μm,and the residual stress will change from compressive stress to tensile stress between 150μm and 180μm.