Method for folding and curving of a metallic plate

Details Method for folding and curving of a metallic plate Method for folding and curving of a metallic plate

2006-05-30

2006-05-30

Banks, Derris H. (Department: 3725)

Metal deforming

Process

Deforming sheet metal

Reexamination Certificate

active

07051567

ABSTRACT:
A metallic plate is curved and folded by means of a press such that a curved portion is formed along an edge thereof, and two opposing straight portions are parallel, which are on two sides of the curved portion; the press includes first and second lower dies, and first and second hydraulic actuated upper dies; the first lower die has notches along it; the second lower die has a trench along it, whose cross-section is like an U; the second upper die has a pressing portion fitting the trench; the plate is first formed with two parallel folded portions, which each defines an obtuse angle, and together define an intermediate portion, with the notches and the first upper die; the width of the intermediate portion equals the arc length of the trench; next, the intermediate portion is sandwiched between and pressed with both the second dies to have the same curvature as the trench.

REFERENCES:
patent: 652658 (1900-06-01), Bischoff
patent: 846139 (1907-03-01), Pruden
patent: 3681994 (1972-08-01), Zbornik
patent: 4309890 (1982-01-01), Ichikawa et al.
patent: 5408858 (1995-04-01), Fukuda
patent: 6098435 (2000-08-01), Takada

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