| 摘要 |
PURPOSE:To iron a cylinder part with a die and to form a flanged cylinder member with high precision by fitting a groove provided on a cylindrical surface around a flange on one end of a cylinder part with the internal diameter part of a sectional die, inserting a wiping punch into the cylinder and moving at least one of a punch and the die. CONSTITUTION:A work W and a corresponding punch 15 are provided at the lower end of a slide and an annular groove (h) is formed on an external diameter surface of a cylinder part (a) in the circumference of a flange (f) of the work W. Then, split dies D1, D2 are assembled into a circular form and when the internal diameter part is fitted to the groove (h) of the work W, a rod 5 for loading the work, and the punch 15 fall down. Therefore, the work W passes through the inside of a die D assembled in a circular form, the external diameter part of the work W is ironed by the die D, the internal diameter surface of the work W sticks to the external circumference surface of the punch 15 to form the external circumference surface and the internal circumference surface.
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