| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a method of manufacturing a ring-like member enabling the efficient production of a backup ring reinforcing a seal member installed in the pressure introduction chamber of a fuel injection valve and having high strength, the backup ring, and a seal structure of the fuel injection valve having the backup ring. <P>SOLUTION: This method of manufacturing the ring-like member manufactured by applying a burring method to a flat plate-like base with rigidity comprises the step of forming a prepared hole in the base, the step of bending the edge of the prepared hole by pressing the edge of the prepared hole using a first tapered punch member 1 having a larger diameter than the prepared hole and tapered toward the end for the prepared hole, and the step of forming a flange part by press-fitting a second punch member having a smaller diameter than the firs punch member and tapered toward the end into the prepared hole of which edge is bent. <P>COPYRIGHT: (C)2007,JPO&INPIT</p> |
