New Approach for Noncircular Following Grinding of Crankshaft Pin

Abstract

A new approach for the precise grinding of crankshaft pin is presented. In which, noncircular following strategy is investigated based on the motion model consists of horizontal feeding axis, additional lifting axis for wheel frame, and the active rotary axis for workpiece. The straight line relationship of wheel center, pin center and grinding point is ensured by the synchronism between standard arc interpolation motion of wheel frame and eccentric circular motion of pin section. Comparing with traditional tangential point tracing scheme, both constant grinding line-speed and simple control algorithm are fulfilled simultaneously. The negative effect of perpendicular deviation introduced by lifting axis is kinematically analyzed as well as the dynamic response error of servo system, and solving methods are carried out accordingly. By computer simulation and experimental test, the reported noncircular following strategy emerges good characteristics in the manufacturing of crankshaft, such as a strong adaptability for wheel wearing, simple motion control and high roundness precision.