Metal working – Bias cutting of tubular stock
Patent
1977-11-21
1980-01-15
Culver, Horace M.
Metal working
Bias cutting of tubular stock
60560, 264314, 72370, B21K 2104, B21D 5154, B23P 1522
Patent
active
041831241
ABSTRACT:
Method of and apparatus for fabricating spiral wrapped cartridge cases or the like, in which an expandable bladder positioned within the interior of the cartridge case is initially expanded by application of hydraulic fluid at relatively low hydraulic pressure levels and at relatively high flow rates until the bladder substantially fills the cartridge case and then is pressurized at relatively high hydraulic pressure levels to form the cartridge case within a die cavity. Hydraulic pressure is applied to the bladder by a hydraulic pressure generator which is powered solely by the closure of the platens of a conventional industrial press between which the die and the pressure generator are mounted. The pressure generator shifts automatically from its low pressure to its high pressure mode of operation as the press platens close.
REFERENCES:
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patent: 2787973 (1957-04-01), Heidmann
patent: 2827766 (1958-03-01), Hufford
patent: 3005431 (1961-10-01), Moller
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patent: 3290919 (1966-12-01), Malinak et al.
patent: 3635061 (1972-01-01), Rydell
patent: 3910087 (1975-10-01), Jones
patent: 4006619 (1977-02-01), Anderson
patent: 4055063 (1977-10-01), Krips et al.
Culver Horace M.
Kisco Company
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