Draw bead having alternating pressure surfaces and grooves

Details Draw bead having alternating pressure surfaces and grooves Draw bead having alternating pressure surfaces and grooves

1978-06-26

1980-04-01

Gilden, Leon

Metal deforming

By use of closed-die and coacting work-forcer

Cup or shell drawing

72377, 72379, B21D 2200

Patent

active

041955102

ABSTRACT:
A draw bead made integral with the die plate or as an insert and having alternating pressure applying surfaces and grooves which will thicken the metals drawn across it minutely at the grooves and will distribute the metal evenly at the pressure surfaces. The draw bead is preferably placed close to the draw radius of the die cavity, and it can have various shapes to compliment the shape of the die cavity. Substantially less blank holder pressure is required because the draw bead restrains the flow of metal and better distributes the metal as it is drawn into the die cavity, and since the draw bead is close to the draw radius, a smaller blank holder is possible. The draw bead can be used to form a portion of the drawn part thereby eliminating a secondary forming operation if the part requires a flat flange about its trim line. When spotting in a new die, metal thickening in certain areas can be greatly reduced or prevented by applying pressure to the underside of the draw bead by hydraulic, pneumatic, or other resilient elements which can be made individually adjustable.

REFERENCES:
patent: 2330228 (1943-09-01), Lyon
patent: 2356457 (1944-08-01), Sonda
patent: 3000274 (1961-09-01), Duskey et al.
patent: 3957005 (1976-05-01), Heffner
patent: 4051707 (1977-10-01), Valel et al.

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