Improvement method of grinding motion mathematical model for cam with discontinuous curvature

The invention belongs to the related technical field of numerical control machining, and discloses a grinding motion mathematical model improvement method for a cam with discontinuous contour curvature. The method comprises the following steps: S1, acquiring a lift table of a cam to be processed, and converting the lift table into point coordinates of a cam profile; calculating the curvature of each point so as to obtain the curvatures of all the points, and further determining the positions with discontinuous curvatures on the cam; and S2, a Bezier curve is adopted for smoothing the position with the discontinuous curvature, the Bezier curve is adjusted till the contour error requirement is met, a smooth cam contour curve is obtained accordingly, the smoothed cam contour is input into the grinding machining mathematical model, and an X-C axis displacement-rotation angle table is obtained. By means of the method, the displacement rotation angle table of the cam with the discontinuous contour curvature is accu