Metal deforming – By use of closed-die and coacting work-forcer – Cup or shell drawing
Patent
1987-11-30
1989-04-18
Spruill, Robert L.
Metal deforming
By use of closed-die and coacting work-forcer
Cup or shell drawing
72345, 7245313, 267119, B21D 4504, B21D 2200
Patent
active
048215520
ABSTRACT:
A drawing installation for a press which must produce the holding force during the drawing operation. The drawing ram displaces the sheet metal part and the sheet metal holder against the holding force and additionally must overcome at the beginning of the sheet metal deformation the inertia forces of the accelerated parts of the drawing installation. In order to avoid the forces which occur thereby in an impact-like manner, the piston rods transmitting the holding force and the ejector piston rods are pre-accelerated prior to the drawing ram. The piston rods each include an operating surface adapted to be acted upon in the drawing direction. The pressure spaces coordinated thereto are connected with a pressure quantity space each of a pre-acceleration cylinder and by way of a refill control with a pressure source. The control of the pre-acceleration cylinder and of the refill from the pressure source takes place in dependence on the movement of the drawing ram. The drawing installation can be used in presses with mechanically driven drawing rams and sheet metal holders retaining the sheet metal part whereby the functions of holding and ejection are carried out by separate pressure cylinders.
REFERENCES:
patent: 3085530 (1963-04-01), Williamson
patent: 3456478 (1969-07-01), Alexander
patent: 3636749 (1972-01-01), Heiser
patent: 4499750 (1985-02-01), Gerber et al.
Baur Siegfried
Brandstetter Rudi
Roos Gerhard
L. Schuler GmbH
Spruill Robert L.
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