Patent ID: 6044552
Filing Date: 2000-04-04
Classification: B23K,Y10T

Abstract:
A method of manufacturing a tappet made of light metal, comprising the steps of: holding a ceiled cylindrical tappet body made of light metal whose top surface is subjected to insulation treatment, and a cam receiving plate made of hard metal which is provided at its outer peripheral edge with an annular piece having a sharp blade tip end such that said top surface of said tappet body and said annular piece of said cam receiving plate face each other by a pair of electrodes of an electric resistance welding apparatus; then relatively moving one of said pair of electrodes toward the other electrode until mating surfaces of said tappet body and said cam receiving plate are tightly contacted with each other, thereby shearing an outer peripheral end of a top wall of said tappet body by said blade tip end of said annular piece; and electrically heating a contact portion between the sheared surface and said annular piece by both said electrodes, thereby bonding said cam receiving plate to a top portion of said tappet body.