Metal deforming – By application of fluent medium – or energy field – Using fixed die
Patent
1997-06-17
1998-10-13
Jones, David
Metal deforming
By application of fluent medium, or energy field
Using fixed die
72 57, B21D 2602
Patent
active
058195734
ABSTRACT:
An apparatus and method for forming contoured work pieces from a flat sheet metal stock includes a die block having a cavity into a planar surface of the die block, and a pressure chamber, the die block and pressure chamber relatively reciprocable to clamp the flat sheet metal stock. The pressure chamber is flow connected to a hydraulic cylinder via a spring loaded ball valve. A reciprocating plunger rod is connected to a hydraulic actuator and positioned to be thrust into the volume of the hydraulic cylinder to increase the pressure within the hydraulic cylinder which in turn opens the ball valve, and by hydraulic pressure, deforms the flat workpiece into the die cavity. An apparatus is described which can include three operational stations, a first station for a punch deformation of the flat workpiece to effectively stretch the workpiece within an area, a hydraulic forming operation for using hydraulic pressure to deform the flat workpiece into a die cavity, and finally a punch cutting station for separating the thus formed workpiece from the otherwise flat sheet metal. The three operational stations are activated by a single stroke of a hydraulic cylinder and the metal sheet is indexed continuously through the three stations.
REFERENCES:
patent: 3373480 (1968-03-01), Fuchs
patent: 3383891 (1968-05-01), Geitz
patent: 3494160 (1970-02-01), Tominaga et al.
patent: 3561239 (1971-02-01), Tominaga et al.
patent: 3673834 (1972-07-01), Brunner et al.
patent: 4788843 (1988-12-01), Seaman
patent: 5540075 (1996-07-01), Hall, Jr.
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