Hydraulic cushioning system for press, having shut-off valve for

Details Hydraulic cushioning system for press, having shut-off valve for Hydraulic cushioning system for press, having shut-off valve for

1992-09-03

1994-03-22

Larson, Lowell A.

Metal deforming

By use of closed-die and coacting work-forcer

Cup or shell drawing

7245313, B21D 2402

Patent

active

052953831

ABSTRACT:
A hydraulic cushioning apparatus for a press, having work-supporting pressure pins, hydraulic cylinders linked with the pressure pins, and a fluid passage connecting a hydraulic power supply to the hydraulic cylinders, to apply a preset hydraulic pressure to the cylinders. The apparatus includes a shut-off valve disposed in the fluid passage for connection and disconnection of the hydraulic power supply to and from the hydraulic cylinders, and a controller for controlling the shut-off valve such that the shut-off valve is closed before a movable die of the press comes into pressing contact with the workpiece, and is held in the closed position for at least a period which expires when the fluid in the hydraulic cylinders rises to the preset pressure level.

REFERENCES:
patent: 3290034 (1966-12-01), Williamson
patent: 3914978 (1975-10-01), Sekanina et al.
patent: 4056965 (1977-11-01), Heiser
patent: 4635466 (1987-01-01), Seki et al.
patent: 4669298 (1987-06-01), Kono et al.
patent: 5065606 (1991-11-01), Kadis
Patent Abstracts of Japan, vol. 12, No. 286 (M-727) (3133) Aug. 5, 1988.
Energie Fluide, vol. 13, No. 67, Jan. 1974, Paris, FR "Les techniques d'emboutissage sont ameliorees par 1'emploi de l'hydraulique", pp. 41-42.
EPO Search Report dated Dec. 17, 1992.

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