Adjustable hydraulic press with both upper and lower double...

Details Adjustable hydraulic press with both upper and lower double... Adjustable hydraulic press with both upper and lower double...

2005-02-04

2011-12-27

Sullivan, Debra (Department: 3725)

Metal deforming

With means to drive tool

Including pneumatic- or fluid-actuated tool support

C072S455000

Reexamination Certificate

active

08082771

ABSTRACT:
The present invention discloses an adjustable hydraulic press with both upper and lower double action, specially suitable for the cylindrical gear formed by stamping or expanding, closed forging and the metal cold forming or metal hot forming of punching, finishing, flanging and drawing of sheet materials. The press comprises four columns, an upper beam, a main slide block, a hold down slide block, a fixing worktable, a floating worktable and a lower beam. A hydraulic chamber a of master cylinder fixed in the upper beam communicates to a hydraulic chamber of an auxiliary cylinder, a plunger of the master cylinder is connected to the main slide block and drives it. A hydraulic chamber of a gas-liquid power accumulator fixed in the main slide block communicates to a hydraulic chamber of a hold down cylinder, a plunger of the hold down cylinder is connected to the hold down slide block and drives it. A plunger of an ejecting cylinder fixed in the lower beam is connected to the floating worktable and drives it. The hydraulic press of the invention simplifies the hydraulic system of the existing hydraulic, improves utilization rate of energy, production efficiency and working accuracy of workpiece.

REFERENCES:
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patent: 4295358 (1981-10-01), Bulmer
patent: 4457684 (1984-07-01), Gram
patent: 4571979 (1986-02-01), Baba et al.
patent: 5823104 (1998-10-01), Beisel et al.
patent: 6520075 (2003-02-01), Shinoda et al.
patent: 2002/0134256 (2002-09-01), Futamura et al.
patent: 87209840 (1988-04-01), None
patent: 2590684 (2003-12-01), None

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