US3664008A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing elongated highly densified powdered metal articles
Assignee: ALLEGHENY INTERNATIONAL ACCEPTANCE Corp
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Filing: 1969-06-12
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Granted: 1972-05-23
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Expires: 1989-06-12
Abstract
Abstract An elongated air-tight can with rounded top, bottom and ends and a filling stem is prepared from heat-resistant material, filled with the powdered metal to be compacted, exhausted to a high vacuum, and the stem sealed while maintaining the vacuum. The powder-filled evacuated can is then heated to a high temperature of approximately 2,100* F. for about 1 hour, then compressed in the die cavity of a press having a recess in one of its plungers for the stem, and with at least one of its plungers having an end of reduced diameter to provide a clearance space into which the peripheral portion of the can flows as compression proceeds. When the density reaches 100 percent, the peripheral portion of the can and the surplus metal powder therein continue to move axially into the clearance space around the plunger or plungers, producing an axially projecting lip extending around the periphery of the can and containing metal powder at a somewhat lower density than in the remainder of the can. The walls of the can are then removed by machining or pickling, together with the less dense peripheral portion of the now substantially solidified elongated metal billet thus produced.
Inventors
- 👤 John Haller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:01
CPC Classifications
B; B22; B22F; B22F3/00; B22F3/12; B22F3/1208; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4981
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
145 words
A method of making a substantially solid elongated body from powdered metal, comprising encasing the powdered metal in an elongated metal container having rounded opposite ends, evacuating said container with the powdered metal therein, heating the evacuated powder-filled container to a temperature sufficient to facilitate subsequent deformation of said container and effect coalescence of the powdered metal particles, applying compressive force to the thus-heated powder-filled container transverse to the longitudinal axis thereof sufficient to deform the same transversely and to compact the powdeRed metal therein into an elongated substantially solid body, restraining the powder-filled container from expanding longitudinally during the application of the transverse compressive force while permitting a peripheral portion of the powder-filled container to deform transversely thereto, terminating the application of said compressive force, and removing the thus-deformed container and the peripherally deformed portion of the now solidified powdered metal from said body.
Claim 2
Independent Claim
145 words
A method of making a substantially solid elongated body from powdered metal, comprising encasing the powdered metal in an elongated metal container having rounded opposite ends, evacuating said container with the powdered metal therein, heating the evacuated powder-filled container to a temperature sufficient to facilitate subsequent deformation of said container and effect coalescence of the powdered metal particles, applying compressive force to the thus-heated powder-filled container transverse to the longitudinal axis thereof sufficient to deform the same transversely and to compact the powdeRed metal therein into an elongated substantially solid body, restraining the powder-filled container from expanding longitudinally during the application of the transverse compressive force while permitting a peripheral portion of the powder-filled container to deform transversely thereto, terminating the application of said compressive force, and removing the thus-deformed container and the peripherally deformed portion of the now solidified powdered metal from said body.
Claim 3
Dependent Claim
22 words
A method, according to claim 1, wherein the longitudinal deformation is produced transversely to the direction of application of the compressive force.
Claim 4
Dependent Claim
29 words
A method, according to claim 1, wherein the peripheral portions of the container and its contents are permitted to deform transversely thereto in opposite directions on opposite sides thereof.
Claim 5
Dependent Claim
26 words
A method, according to claim 1, wherein the container has an elongated longitudinal wall which has a rounded portion therealong on at least one side thereof.
Claim 6
Dependent Claim
23 words
A method, according to claim 1, wherein the container has an elongated longitudinal wall which has rounded portions therealong on opposite sides thereof.
Claim 7
Dependent Claim
26 words
A method, according to claim 5, wherein the container has substantially flat longitudinal wall portions disposed on opposite sides thereof and interconnecting the rounded portions thereof.
Claim 8
Dependent Claim
15 words
A method, according to claim 5 wherein the rounded portions are of approximately cylindrical configuration.
Claim 9
Dependent Claim
62 words
A method, according to claim 1, wherein the container is confined in a cavity having restraining side walls and having end walls closing said cavity and having clearance spaces between said side walls and end walls adapted to receive the deformed portions of said container during deformation thereof, at least one of said end walls being movable for applying said compressive force.
Claim 10
Dependent Claim
16 words
A method, according to claim 1, wherein said rounded opposite ends are of substantially toroidal configuration.
Claim 11
Dependent Claim
25 words
A method, according to claim 1, wherein the container is permitted to undergo a predetermined limited deformation longitudinally before being restrained from further longitudinal deformation.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-23 | 1975-11-22 | 1976-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-23 | 1979-11-22 | 1980-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-23 | 1983-11-22 | 1984-05-23 | $7700.00 | Window Closed / Lapsed |