Method of bending a workpiece to a predetermined bending angle

Details Method of bending a workpiece to a predetermined bending angle Method of bending a workpiece to a predetermined bending angle

1989-04-14

1990-10-30

Jones, David

Metal deforming

Process

Deforming sheet metal

72389, 72432, 72446, 72448, B21C 3702

Patent

active

049660292

ABSTRACT:
The invention provides a method of bending a workpiece to a predetermined bending angle, in which, in a first step, the workpiece is bent to a somewhat greater bending angle and then released. Thereafter, the amount of resilient back motion occurring after the first bending operation is measured. The adjustable die bottom is readjusted such that a bending angle would result in the next bending operation which corresponds to the desired final bending angle minus the amount of resilient back motion. After the second bending operation, the workpiece is released and the legs thereof will resiliently move back to enclose the final predetermined bending angle.

REFERENCES:
patent: 3552182 (1971-01-01), Handler
patent: 3844156 (1974-10-01), Hanni et al.
patent: 3978706 (1976-09-01), Nakagawa et al.
patent: 4106323 (1978-08-01), Haenni et al.
patent: 4131008 (1987-12-01), Malatto
patent: 4653307 (1987-03-01), Zbornik
patent: 4802357 (1989-02-01), Jones
patent: 4864509 (1989-09-01), Somerville et al.

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