Cutting – Processes
Patent
1989-03-03
1991-08-27
Yost, Frank T.
Cutting
Processes
83530, 83617, 100 35, 100 48, B30B 1522, B26F 114
Patent
active
050423363
ABSTRACT:
A control apparatus and method for progressively fracturing a workpiece from a material sheet in a press in which a ram is progressively advanced through the thickness of the material sheet in discrete steps, each of the discrete steps including an advance of the ram into the material sheet a predetermined distance less than the total thickness of the sheet, a stopping of the advance of the ram, a relief of the pressure built up in the press due to the pressurized advance of the ram and a subsequent advance of the ram through the material sheet. A distance measuring transducer generates an output indicative of the position of the piston of the cylinder and the ram during movement of the ram. A controller, in response to a stored control program and the output of the distance measuring transducer, controls the operation of fluid valves to supply pressurized fluid to the cylinder to reciprocate the ram. The controller controls pressure regulating valves to supply fluid at a plurality of discrete pressures to the cylinder throughout each cycle of operation of the press.
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Peterson Kenneth E.
Yost Frank T.
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