Method for manufacturing a shaft member having a sintered part bonded thereto and a camshaft for an internal combustion engine

Abstract

A method for manufacturing a shaft member having a sintered part bonded thereto is simple and provides an increased process yield and a high accuracy in position and angle of the sintered part. A green compact is prepared by subjecting a metal or alloy powder to a compression molding. A projection formed on an outer peripheral surface of the shaft member is embedded into the green compact, while chipping partially the green compact with the projection, to combine the green compact with the shaft member. Then, a sintering is carried out.

1 . A method for manufacturing a shaft member having a sintered part bonded thereto, which comprises:
 a green compact preparation step of subjecting a metal or alloy powder to a compression molding to prepare a green compact;   a projection formation step of pressing a pressing device onto an outer peripheral surface of a shaft member at a predetermined position to deform the outer peripheral surface of said shaft member to form a projection having a height of from 0.03 mm to 0.25 mm at said predetermined position;   a combination step of embedding said projection formed on the outer peripheral surface of the shaft member into the green compact, while chipping partially the green compact with the projection, to combine the green compact with the shaft member; and   a sintering step of sintering said green compact to convert same into a sintered part and bond the sintered part integrally to the shaft member through a sinter-diffusion bonding.   
   
   
       2 . The method for manufacturing a shaft member having a sintered part bonded thereto, as claimed in  claim 1 , wherein:
 a temporary bonding step of temporarily bonding the green compact to the shaft member by an adhesive agent is carried out after said combination step before said sintering step.   
   
   
       3 . The method for manufacturing a shaft member having a sintered part bonded thereto, as claimed in  claim 1 , wherein:
 said sintered part comprises a cam lobe and said shaft member comprises a shaft.   
   
   
       4 . A camshaft for an internal combustion engine, manufactured by the method for manufacturing a shaft member, as claimed in  claim 1 . 
   
   
       5 . The method for manufacturing a shaft member having a sintered part bonded thereto, as claimed in  claim 2 , wherein:
 said sintered part comprises a cam lobe and said shaft member comprises a shaft.   
   
   
       6 . A camshaft for an internal combustion engine, manufactured by the method for manufacturing a shaft member, as claimed in  claim 2 . 
   
   
       7 . A camshaft for an internal combustion engine, manufactured by the method for manufacturing a shaft member, as claimed in  claim 3 .