FORMING METHOD OF METAL FORMED PART HAVING TOOTH SHAPED PROJECTING LINE WITH TOOTH LACKED REGION

摘要

PURPOSE: To suppress the burr near tooth lacked region in the forging method of the gear outer peripheral face having spline with tooth lacked region. ;CONSTITUTION: A carbon steel shape stock is forcedly pushed into the annular clearance 44 between a die 2 and mandrel 4. A material of shape stock is flowed into a forming line groove 27 of the die 2 and spline is formed. The excess material due to lacked tooth of spline is flowed into a relief groove 47 of the mandrel 4 and an excess stock relief projecting part is formed. Subsequently, the whole inner peripheral part of preformed body including the excess material relief projecting part is cut/removed by a prescribed depth, the preformed body is made to a gear part.;COPYRIGHT: (C)1996,JPO