Bending machine utilizing controlled expandable pressure device

Details Bending machine utilizing controlled expandable pressure device Bending machine utilizing controlled expandable pressure device

1994-01-24

1995-04-25

Jones, David

Metal deforming

By relatively movable offset tool-faces

With tool motion in fixed path

72446, 72465, 72481, B21D 501

Patent

active

054088585

ABSTRACT:
A bending machine having an upper punch containing portion, or beam, and a lower die containing portion, or beam, is modified by incorporating a controlled expandable pressure device whereby the pressure applied to a work material is uniformly distributed throughout the surface of the material. In a first embodiment, the device is mounted in the upper and lower machine portions; in a second embodiment, the device is mounted only in the upper machine portion; in a third embodiment, the device is mounted only in the lower machine portion; and in a fourth embodiment, segmented devices are mounted in the upper machine portion and a single, elongated device is mounted in the lower machine portion.

REFERENCES:
patent: 4016742 (1977-04-01), Shiokawa
patent: 4106323 (1978-08-01), Haenni et al.
patent: 4131008 (1978-12-01), Malatto
patent: 4653307 (1987-03-01), Zbornik
patent: 4966029 (1990-10-01), Zbornik
patent: 5067340 (1991-11-01), MacGregor

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