Metal deforming – By use of closed-die and coacting work-forcer – Cup or shell drawing
Patent
1975-11-05
1977-11-08
Lanham, C.W.
Metal deforming
By use of closed-die and coacting work-forcer
Cup or shell drawing
137843, 251 5, 267119, B21D 2402
Patent
active
040569659
ABSTRACT:
A press system includes an improved valve assembly which is utilized to control a flow of hydraulic fluid from a die cylinder chamber. This valve assembly includes a pair of rigid foraminous members and a resiliently deflectable valve member. The valve member is movable between a closed position extending across and sealing openings in the foraminous members and an open position in which the valve member is spaced apart from the openings to enable hydraulic fluid from the die cylinder chamber to flow through the openings in the foraminous members. The valve member is urged toward the closed position by a compressible fluid, such as nitrogen gas. When the hydraulic fluid pressure in the die cylinder chamber exceeds a predetermined pressure, the valve member is moved from the closed position to the open position against the influence of the biasing pressure applied against the valve member by the compressible fluid. In one embodiment of the invention a pair of valve assemblies are associated with the press to relieve the hydraulic fluid pressure in the die cylinder chamber at a relatively high pressure during an initial portion of an operating cycle of the press and to provide a relatively low hydraulic fluid pressure in the die cylinder chamber during a final portion of the operating cycle. In another embodiment of the invention the hydraulic fluid pressure at which the die cylinder chamber is relieved is varied as a function of extent of relative movement between the piston and cylinder which form the die cylinder chamber.
REFERENCES:
patent: 1926012 (1933-09-01), Ferris
patent: 2294451 (1942-09-01), Ernst
patent: 2989019 (1961-06-01), Van Sciver
patent: 3092144 (1963-06-01), Green
patent: 3290034 (1966-12-01), Williamson
patent: 3522926 (1970-08-01), Bryant
patent: 3937440 (1976-02-01), MacGregor
Crosby Gene P.
Lanham C.W.
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