Metal deforming – By application of fluent medium – or energy field – Using fixed die
Patent
1998-04-16
2000-01-18
Jones, David
Metal deforming
By application of fluent medium, or energy field
Using fixed die
72 58, 72 62, 294211, B21D 2602, B21D 3908
Patent
active
060148799
ABSTRACT:
An apparatus for hydroforming a tubular metal blank comprises a die structure, a hydroforming fluid source, a hydraulically driven tube-end engaging structure, a hydraulically driven pressure intensifying structure, and a single hydraulic power source. The tube-end engaging structure seals opposite ends of the tubular metal blank in said die cavity and is movable to longitudinally compress the tubular metal blank. The tube-end engaging structure receives hydroforming fluid from said hydroforming fluid source and has a hydroforming fluid supplying outlet through which hydroforming fluid can be provided to the tubular metal blank. The hydraulically driven pressure intensifying structure is movable to pressurize the hydroforming fluid provided to the interior of the tubular metal blank and thereby expand a diameter of the blank. A single hydraulic power source provides the hydraulic fluid under pressure to said hydraulically driven pressure intensifying structure in order to move the pressure intensifying structure and thereby pressurize the hydroforming fluid provided to the interior of the tubular metal blank and expand the diameter of the tubular metal blank so that its exterior surface conforms to that of the internal die surface. The single hydraulic power source also provides the hydraulic fluid under pressure to the hydraulically driven tube-end engaging structure to enable the tube-end engaging structure to longitudinally compress the tubular metal blank and cause metal material of the diametrically expanded tubular blank to flow longitudinally inwardly in order to replenish a wall thickness of the diametrically expanded tubular metal blank and maintain the wall thickness thereof within a predetermined range.
REFERENCES:
patent: 3335590 (1967-08-01), Early
patent: 3350905 (1967-11-01), Ogura et al.
patent: 4788843 (1988-12-01), Seaman et al.
Horton Frank A.
Jaekel Fred G.
Lee Arthur L.
Cosma International Inc.
Jones David
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