Metal deforming – With means to drive tool – Including pneumatic- or fluid-actuated tool support
Patent
1993-01-29
1995-01-10
Jones, David
Metal deforming
With means to drive tool
Including pneumatic- or fluid-actuated tool support
7245301, 100269R, B21J 728
Patent
active
053796284
ABSTRACT:
A method of controlling the drive of a forming machine, in particular of a hydraulic press or hydraulically driven forging machine, having at least one pump cylinder actuated by a crank-type driving mechanism and having return cylinders subjected to constantly rechargeable accumulator pressure, makes simple stroke position shifting and longer overall strokes possible by shutting off the supply of pressure medium to the return cylinders after a working stroke, whereby the return stroke is prevented from occurring and pressure fluid is sucked from the low pressure container into the working cylinder of the forming machine, and only turning the supply of pressure medium to the return cylinders on again for a new working stroke. In a drive of a forming machine the working cylinder of the forming machine is connected to the pump cylinder through a line that is connected via a first controlled check valve to a low pressure container, and a second controlled check valve is fitted in a line connecting the return cylinders with the fluid accumulator or the low pressure container.
REFERENCES:
patent: 3158046 (1964-11-01), Steinfort et al.
Pahnke Michael
Westermeyer Walter
Jones David
Pahnke Engineering GmbH & Co. KG
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