Patent ID: 7788805
Filing Date: 2010-09-07
Classification: B21D,B21J,B21K,B23P,F01L,Y10T

Abstract:
1. A method for manufacturing a rocker arm, the method comprising: a step of obtaining an intermediate product having two side walls with both side walls extended in a predetermined direction and arranged in parallel with each other and having a one side connection wall connecting lower ends of both the side walls at a longitudinal one end side of the intermediate product; a side wall bending step of inwardly bending both the side walls formed at the one end of the intermediate product; and an ironing step of forming valve stem guide walls at both sides of the one end side connection wall in a downwardly protruded manner by pressing down ironing dies against outer surfaces of both the inclined side walls from an upper side to a lower side to execute ironing of outer surface portions of both the side walls to plastically fluidize constituent material of both the side walls.