Metal deforming – By three or more coacting relatively movable tools – Concurrently actuated tools
Patent
1989-01-31
1990-07-17
Crane, Daniel C.
Metal deforming
By three or more coacting relatively movable tools
Concurrently actuated tools
7245302, 7245318, 91 49, B21J 912
Patent
active
049413422
ABSTRACT:
A multi-ram forging assembly has a piston-cylinder unit for driving each ram carrying a forging tool wherein at least two diametrically opposed forging unit simultaneously act on a workpiece. Each piston-cylinder unit comprises a pressurized inlet chamber for containing a hydraulic pressure fluid at a predetermined pressure behind a piston movably disposed in the cylinder. The piston includes a front-end ram carrying a forging tool. A valve including a valve seat member is disposed on the piston at a rear side opposite to the front-end ram. A valve cone cooperates with the valve seat member to provide a closed position and an open position for the valve. An actuator is connected to move the valve cone between the closed and open positions. The piston includes a passage bore extending from the valve seat member to a pressure fluid discharge chamber connected to a hydraulic pressure fluid reservoir container providing a pressureless discharge of the pressure fluid medium. A piston return pressure chamber is located within the cylinder to cause the return of the piston under the action of a pressure fluid having a preselected predetermined pressure maintained within the piston return pressure chamber.
REFERENCES:
patent: 3456297 (1969-07-01), Andreasson
patent: 3916667 (1975-11-01), Paknke et al.
patent: 3948148 (1976-04-01), Bringer
Herndl Otto
Schiller Werner
Crane Daniel C.
Eumuco Aktiengesellschaft fur Maschinenbau
Markva Neil F.
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