Patent US4048836A successfully refreshed from Google Patents.
US4048836A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Forming and heat treating process
Assignee: Wyman Gordon Co
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Filing: 1976-08-26
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Granted: 1977-09-20
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Expires: 1996-08-26
Abstract
Abstract This invention relates to a forming and heat treating process and, more particularly, a process for forging and heat treating an aluminum alloy article wherein the article is quickly cooled after solution heat treating to terminate aging and to cause shrinkage and then is subjected to a re-striking operation to produce stress relieving.
Inventors
- 👤 Robert A. Eddy
- 👤 Norman F. Gustafson
- 👤 Stephen J. Erwin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 06:33
CPC Classifications
B; B21; B21J; B21J1/00; B21J1/06; B21J5/00; C; C22; C22F; C22F1/00; C22F1/04
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
145 words
A process for forming and heat treating an aluminum alloy article, comprising the steps of: a. forging the article in a set of finish dies, b. black etching the article, c. solution heat treating the article at a temperature in the range from 830° F. to 930° F., d. immediately cooling the article in warm water at a temperature in the range from 140° F. to 180° F., and removing it as soon as it reaches water temperature, e. immediately cooling the article in water at room temperature, f. immediately packing the article in dry ice, g. sub-cooling the article in nitrogen to -100° F., and h. restriking the article in the said finish dies, the article being stored after restriking in a nitrogen atmosphere at -100° F., being checked for configuration, and being reworked if necessary before being allowed to return to room temperature.
Claim 2
Dependent Claim
145 words
A process for forming and heat treating an aluminum alloy article, comprising the steps of: a. forging the article in a set of finish dies, b. black etching the article, c. solution heat treating the article at a temperature in the range from 830° F. to 930° F., d. immediately cooling the article in warm water at a temperature in the range from 140° F. to 180° F., and removing it as soon as it reaches water temperature, e. immediately cooling the article in water at room temperature, f. immediately packing the article in dry ice, g. sub-cooling the article in nitrogen to -100° F., and h. restriking the article in the said finish dies, the article being stored after restriking in a nitrogen atmosphere at -100° F., being checked for configuration, and being reworked if necessary before being allowed to return to room temperature.
Claim 3
Dependent Claim
23 words
A process as recited in claim 1, wherein the restriking takes place with the article at substantially the same temperature as the sub-cooling.
Claim 4
Dependent Claim
29 words
A process as recited in claim 1, wherein the black etching takes place by immersing the article in a solution of sodium hydroxide and then washing it in water.
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) | 1980-09-19 | 1981-03-21 | 1981-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-19 | 1985-03-21 | 1985-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-19 | 1989-03-21 | 1989-09-20 | $7700.00 | Window Closed / Lapsed |