Method and apparatus for bending malleable plates

Details Method and apparatus for bending malleable plates Method and apparatus for bending malleable plates

1998-04-08

1999-05-11

Jones, David

Metal deforming

By relatively movable offset tool-faces

With tool motion in fixed path

72382, 72347, 723896, B21D5/01

Patent

active

059016019

ABSTRACT:
In a method and apparatus for press bending a metal plate, a punch is inserted into a recess of a die to bend a plate. The punch has a first edge formed away from a die and a second edge formed near the die. A corner of the recess of the die opposed to the punch is chamfered. The chamfered face has a third edge formed at the border of the top side of the die at the chamfered recess. In a first half of the press bending, the plate is bent with the first and third edges serving as lines of contact. Subsequently, the plate is further bent with the second edge serving as a line of contact. A portion of the punch between the first and second edges is held in a non-contact state with the plate throughout steps of press bending the plate.

REFERENCES:
patent: 4373371 (1983-02-01), Liu
patent: 4416142 (1983-11-01), Thorne-Thomsen
patent: 5501094 (1996-03-01), Mizuta et al.

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