Metal deforming – With means to drive tool – Including pneumatic- or fluid-actuated tool support
Patent
1987-09-24
1989-08-29
Jones, David
Metal deforming
With means to drive tool
Including pneumatic- or fluid-actuated tool support
72344, 267119, 267122, 267130, B21D 2402
Patent
active
048605719
ABSTRACT:
A power press used for metal working is provided with a cushioning system. During the operation of a press, abrupt changes in the velocity of certain moving parts of the press may damage or cause rapid wear to parts. The present invention utilizes pneumatic bellows actuators. A hydraulic snubber and snubber-intensifier having closed systems are in combination with a pneumatic bellows actuated die cushion. The snubber has a piston within a cylinder assembly. During the upward stroke of the ram of the press, the movable plate of the die cushion is held back by the piston so as to prevent a damaging impact on the movable die parts and workpiece supported by an air cushion. Fluid is allowed to flow from the top of the piston through a flow valve to return to a reservoir within the die cushion or to the bottom of the cylinder. During the downstroke the piston causes an increase in pressure in the oil below the piston, which flows out through a flow control valve so as to increase the force holding the work in the die. A programmable controller may be used to control the valves to produce a desired program of piston upward motion and oil pressure below the piston during the downstroke.
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Bozich George J.
Kotynski Robert J.
Smedberg Kenneth L.
Jones David
Smedberg Kenneth L.
Zummer Anthony S.
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