Press forming process and apparatus therefor

Metal deforming – By relatively movable offset tool-faces – Plural

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Details

72348, 72414, 72404, 72472, 72379, B21D 1702

Patent

active

045907838

ABSTRACT:
A press forming process is composed of a step of removing wrinkles of the surface of a curved elongate flat sheet metal workpiece which has been prepared by a so-called edge bending process. The wrinkle removing step is carried out prior to a U-shape bending step in which the workpiece is bent to have a U-shaped cross-section in order to obtain an curved elongate channel-shaped article, thereby improving the quality of the resulting article while preventing press dies from being damaged.

REFERENCES:
patent: 2670527 (1954-03-01), Roper
patent: 3307387 (1967-03-01), Lacey, Jr. et al.
patent: 3491573 (1970-01-01), Tennison, Jr.
patent: 3908435 (1975-09-01), Bowman, Jr. et al.
patent: 4413495 (1983-11-01), Peuhkurinen et al.
patent: 4509357 (1985-04-01), Zbornik

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