Metal deforming – By application of fluent medium – or energy field – By kinetic energy of fluid or field
Patent
1997-09-30
1998-10-06
Sipos, John
Metal deforming
By application of fluent medium, or energy field
By kinetic energy of fluid or field
266255, 432205, B21D 2602, B21J 503
Patent
active
058160906
ABSTRACT:
A pneumatic isostatic forging process for densification of near net shape workpieces is disclosed. In the process, a workpiece is heated prior to the forging process, such as from a previous processing step. The workpiece is loaded into a pressure vessel. The pressure in the vessel is ramped to an operating pressure and held for approximately 10-120 seconds. The vessel is pressurized using rapid pressurization to achieve a high strain rate to assist in the final closure of voids within the workpiece, with the increase in the strain rate lowering the flow stress requirements for the workpiece, thereby making the workpiece more susceptible to plastic deformation. The rapid pressurization serves to densify the gas within the vessel, thereby increasing the viscosity of the gas in order to substantially reduce or altogether prevent absorption of the gas into the workpiece in order to sustain a differential between the internal pressure and the surface pressure of the workpiece, thereby allowing plastic deformation to take place through a collapsing of the material, or removal of the voids. After pressurization of the vessel for a prescribed period of time, it is depressurized and the workpiece is unloaded.
REFERENCES:
patent: 2878140 (1959-03-01), Barr
patent: 3279917 (1966-10-01), Ballard et al.
patent: 3284195 (1966-11-01), Googin et al.
patent: 3363037 (1968-01-01), Levey, Jr. et al.
patent: 3419935 (1969-01-01), Pfeiler et al.
patent: 3562371 (1971-02-01), Bush
patent: 3571850 (1971-03-01), Pohto et al.
patent: 3577635 (1971-05-01), Bergman et al.
patent: 3748196 (1973-07-01), Kemeny
patent: 3765958 (1973-10-01), Freche et al.
patent: 4359336 (1982-11-01), Bowles
patent: 4431605 (1984-02-01), Lueth
patent: 4435213 (1984-03-01), Hildeman et al.
patent: 4518441 (1985-05-01), Hailey
patent: 4564501 (1986-01-01), Goldstein
patent: 4582681 (1986-04-01), Asari et al.
patent: 4591482 (1986-05-01), Nyce
patent: 4601877 (1986-07-01), Fujii et al.
patent: 4612162 (1986-09-01), Morgan et al.
patent: 4615745 (1986-10-01), Goransson et al.
patent: 4684405 (1987-08-01), Kolaska et al.
patent: 4743312 (1988-05-01), Eridon et al.
patent: 4744943 (1988-05-01), Timm
patent: 4810289 (1989-03-01), Hoyer et al.
patent: 4856311 (1989-08-01), Conaway
patent: 4921666 (1990-05-01), Ishii
patent: 4942750 (1990-07-01), Conaway
patent: 4961778 (1990-10-01), Pyzik et al.
patent: 5009842 (1991-04-01), Hendrickson et al.
patent: 5080841 (1992-01-01), Nishio
patent: 5110542 (1992-05-01), Conaway
patent: 5269830 (1993-12-01), Rabin et al.
patent: 5445787 (1995-08-01), Friedman et al.
patent: 5561834 (1996-10-01), Score
Hodge Edwin S.
Tavenner Robert F.
Ametek Specialty Metal Products Division
Paradiso John
Sipos John
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