| 摘要 |
Method and device for forming a pulley are disclosed. The method of the present invention includes the first step to fix the plate working piece formed with the hole in the intermediate thereof to the first forming device; the second step to form the inner hub by rotating the plate working piece and pressing the upper surface of the plate works in drawing process; the third step to obtain the first semi-manufactured pulley by pressing the upper surface of the plate working piece and by forming the outer hub in drawing process. Further, the method can include the fourth step to fix the first semi-manufactured pulley to the second forming device; the fifth step to gather the first convex bead portion by pressing the edge of the first semi-manufactured pulley; the sixth step to form the second convex bead portion by pressing the first convex bead portion; the seventh step to fix the first semi-manufactured pulley to the third forming device; the eighth step to form the flat bead portion by pressing the convex bead portion, and the ninth step to obtain the second semi-manufactured pulley having the V-profile forming portion 70 formed with the recess 80 on the outer periphery surface by pressing the flat bead portion. <IMAGE> |
