METHOD OF MANUFACTURING EXTERIOR PART FOR ASSEMBLY TYPE CAMSHAFT

摘要

A method of manufacturing an exterior part for an assembly type camshaft, wherein heat is rapidly removed from a cam piece constitution body (6) by a chiller (4) immediately after a molten metal is filled, and the constitution body is chilled (formed into white iron). Accordingly, the hardness of the cam piece constitution body (6) is remarkably increased, whereas the tensile strength and shearing strength thereof are lowered. Cam pieces in rough form and notches are alternately formed on the cast cam piece constitution body (6). Hammering is given to the notches with a breaking tool in the state of the cam piece constitution body (6) held on a holding device. Then, the cam piece constitution body (6) with low tensile strength is broken at the notches forming fragile parts to provide cam pieces.