Method for producing exterior component of assembled camshaft

摘要

Chillers ( 4 ) rapidly remove heat from a coupling of cam pieces ( 6 ) immediately after molten metal is injected, so as to make the coupling of cam pieces ( 6 ) chilled (be a white cast iron). As a result, tensile strength and shear strength of the coupling of cam pieces ( 6 ) decreases while the coupling of cam pieces ( 6 ) becomes harder. Cam piece original shapes and notches are alternately formed in the coupling of cam pieces ( 6 ). The notch of the coupling of cam pieces ( 6 ) which is being held by a holder is hit by a breaking tool. Then, the coupling of cam pieces ( 6 ) with low tensile strength breaks at the notch which is the vulnerable portion so that an individual cam piece is obtained.