Method for producing rocker arms

摘要

A method for producing dimensionally accurate rocker arms formed with a roller-receiving portion at one end. The method of the invention produces rocker arms which have a roller-receiving, fork-like portion at one end of the rocker arm body for receiving a roller contacting a cam. The method uses the steps of inserting between the opposed inner surfaces of the roller-receiving portion an insert jig having a parallel surface and a slant surface inclined inwardly of the jig by a predetermined angle from the parallel surface; placing a pressing jig on an outer surface of the roller-receiving portion, the surface of the pressing jig to be contacted with the outer surface of the roller-receiving portion having a parallel surface and a slant surface inclined outwardly of the pressing jig by a predetermined angle from the parallel surface; and applying pressure to the pressing jig to thereby press the inner surfaces of the roller-receiving portion against the surfaces of the insert jig. The predetermined angles of the insert jig and the pressing jib are respectively in the range of from about 2 DEG to about 4 DEG .