Method of working for bending metal material and thereby obtained friction core plate of friction clutch
OwnerHiroichi Suzukiinventor
Life of this patent
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Abstract
When a metal piece is forced to undergo a 180.degree. bend with a press, in order that the outer end face of the bent portion be square rather than rounded, the portion to be bent is put in a die and buckled toward the folding line while bending is effected. Also a number of T-shaped projections radially extending from the outer periphery of an annular iron plate are formed with the lug portions of such projections bent so that the outer ends of the bent portions are formed flat.
Claims3
The method of working for metal bending comprising providing a press consisting of a lower die having a bottom wall and therefrom a perpendicular rising side wall and an upper die in slide contact with said side wall and a movable guide having a side wall in slide contact with another side wall of said upper die;
- bending with another press a metal material piece folding it into an acute angle so that the length of the folded portion is larger than the distance between the side wall of said lower die and the side wall of said movable guide;
- placing the folded piece upon the lower die bottom wall;
- placing the folded portion between the side wall of the lower die and the side wall of said movable guide;
- pressing said folded portion in a direction perpendicular to said bottom wall at the same time slide contacting said upper die both with the side wall of said lower die and the side wall of said movable guide buckling the folded portion in the direction of its length so that at the outside of the folded line of said folded portion a flat portion is formed which is perpendicular both to said folded portion and of said folded piece, with said folded portion bearing against and parallel to the folded piece.
In an annular iron core plate of a clutch to be used as a friction plate having a series of spaced T-shaped projections extending radially from the periphery of said annular plate, each projection having a pair of spaced lugs folded inwardly into face-to-face relation to each other, characterized in that the outside of the folded line of said projection is perpendicular to the folded portion and also perpendicular to the folded piece forming a flat portion and providing spaces between said flat portions of adjacent projections.
Dependencies are inferred from the claim text.