Title:
【発明の名称】鍛造機
Document Type and Number:
Japanese Patent JP2562496
Kind Code:
B2
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.
Inventors:
OTSUTOO HERUNDORU
UERUNAA SHIRAA
UERUNAA SHIRAA
Application Number:
JP2596189A
Publication Date:
December 11, 1996
Filing Date:
February 06, 1989
Export Citation:
Assignee:
EUMUCO AG FUER MASCHINENBAU
International Classes:
B21J7/14; (IPC1-7): B21J7/14
Attorney, Agent or Firm:
Toshio Yano (1 outside)