Method for Manufacturing Ring-Shaped Member

Abstract

The yield rate or the percentage of the weight of the ring-shaped member with respect to the weight of the raw material is improved to achieve the cost reduction of the ring-shaped member. A plurality of longitudinal annular blanks 3 is punched out from a raw material 2 of a predetermined width, and the longitudinal annular blank 3 is molded into an annular ring-shaped member 1.

1 . A method of manufacturing a ring-shaped member, wherein a plurality of longitudinal annular blanks is punched out from a raw material of a predetermined width, and the longitudinal annular blank is molded into an annular ring-shaped member. 
   
   
       2 . The method of manufacturing the ring-shaped member according to  claim 1 , wherein the material is removed such that both end edges in the width direction of the blank lie along both ends in the width direction of the raw material when punching out the blank from the raw material. 
   
   
       3 . The method of manufacturing the ring-shaped member according to  claim 2 , wherein the blank includes linear parts facing each other at both sides in the width direction and a pair of curved parts for continuing both ends in the longitudinal direction of the linear parts, the outer end edges of the linear parts of the blank being formed by both end edges in the width direction of the raw material.