Method for molding cam ring with convex cams, molding die assembly, and molded cam ring

摘要

A method for molding a cam ring which is provided on the peripheral surface thereof with convex cams whose shape in a developed view is non-linear, the cams overlapping each other at the ends thereof as viewed in the axial direction of the cam ring. The method includes setting first and second cylindrical split molding dies so that cam forming surfaces thereof are located in a normal molding position; and upon completion of a molding operation, rotating the first and second cylindrical split molding dies relative to each other and relative to the molded cam ring, in a direction of an angle not greater than the minimum angle defined between a tangential line on each corresponding the front and rear cam surfaces and the plane including the axis of the cam ring, to thereby part the first and second cylindrical split molding dies from the molded cam ring.