Abstract: The method and theory of pre-deformation are presented, which is obtained by using a mould contour to force a bearing ring into deforming machining on a common bearing grinding machine. Then, based on the theoretical contour of a noncircular raceway, the reversed arithmetic and progress of the inner contour of an ultra precision mould are given, during which both the elastic ring, mould deformation and the contact deformation between a bearing and a mould are considered. Finally, the waveform and ellipse degree error caused by different inner contours of a mould are compared, and the influence of the grinding force and its location in the machining progress on the raceway precision is also analyzed. The experiment shows that the shape and precision of the works agree with the standard. The surface quality has also been greatly improved. This method offers a credible way for decreasing the machining cost of new bearings and enhancing both the productivity and the quality consistency.

Key words: Aero bearing, Mould, Noncircular raceway, Pre-deformation machining