Method and device for forming a pipe

Metal deforming – With use of control means energized in response to activator... – Metal deforming by use of roller or roller-like tool element

Reexamination Certificate

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C072S173000, C072S170000

Reexamination Certificate

active

07040127

ABSTRACT:
A method and a device are proposed which accurately and efficiently form a pipe with a bending machine only, without using any correcting devices. A plate having holes is fed into a bending machine in which under an upper roll, lower rolls parallel thereto are arranged, and a pipe is formed during a rough forming step and a fine forming step. In the rough forming step, bending is performed so that the plate will have a required diameter at hole portions. In the fine forming step, the hole portions are not pressed for bending while other portions are rolled so as to become closer to a required diameter to form the pipe.

REFERENCES:
patent: 3103965 (1963-09-01), Savory
patent: 3197990 (1965-08-01), Stubblefield
patent: 3693391 (1972-09-01), Mori
patent: 5115658 (1992-05-01), Kirchhoff et al.
patent: 6044675 (2000-04-01), Davi
patent: 63-36852 (1988-07-01), None
patent: 2000-288635 (2000-10-01), None

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