Influence of superfinishing parameters on residual stress of bearing raceway

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 -266 MPa 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.