| 摘要 |
PURPOSE:To obtain a member integrated a cylinder and a flange at a small expense in a few working hours by pressing a longitudinal end of a solid material to be worked, forming a depression on the end, and spreading and forming a flange in the radial direction by plastic flow at the same time. CONSTITUTION:The material 1 to be worked is accommodated in a hole 7c of a lower die 7 and an upper die 8 is downed to be fitted to the upper end of the material 1. An ejecting pin 9 and an upper ram 10 are fitted into the bottom of the lower die 7 and the upper die 8, respectively. A clearance 13 for forming the flange is formed in the mating surface of the dies 7 and 8. The ram 10 is pressed in the axial direction of the material 1 to form a circular depression 4 and a part of the material 1 is guided by the periphery of the ram 10 and is flowed into the circular clearance 13 by plastic flow to form a circular plate-like flange at the same time. Then the formed depression 4 of the material 1 is pierced to be an axial through hole to obtain the member having the flange 2 integrated with the cylinder 3.
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