| 摘要 |
PURPOSE:To enhance the quality and effectiveness in manufacture of operating rods for brake booster as well as suppress the costs by making them from long size rods and performing all processes by the use of dies. CONSTITUTION:A round rod cut in a certain length, material A, is processed with a die 10 to be given a form of thin shaft 18, and then dies 22, 23 make processing at the thin shaft 26 and chamfered part 31 as well as form a flanged part 20, and finally an upper 32 and a lower 33 die form a projection at the end of the thin shaft 13(18) of the material A, and upon forming preliminarily a spherical part 36(37) with a preliminary punch 35, a genuine spherical part 39(40) using a finish punch 38. Thereafter total finishing is made by a conventional method. Thus an operating rod 19 for brake booster is obtained. |
