US4439246A
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Method of making hollow bodies under pressure from aluminum alloys
Assignee: Metallurgigue de Gerzat
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Filing: 1982-07-01
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Granted: 1984-03-27
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Expires: 2002-07-01
Abstract
Abstract A hollow body from an aluminum alloy is prepared by a method of manufacturing a hollow body under pressure from an aluminum alloy, comprising the steps of: (1) preparing an alloy of a composition consisting of (by weight) 5.6≦Zn≦6.1, 2.0≦Mg≦2.4, 1.3≦Cu≦1.7, 0.15≦Cr≦0.25, Fe≦0.10, Fe+Si≦0.25, Mn≦0.04, Zr≦0.03, Ti≦0.04, with the remainder of the alloy being aluminum and impurities with the total amount of impurities being no more than 0.15 with the maximum amount of any given impurity being 0.05; (2) casting the alloy in the form of a billet; (3) hot extruding a billet at a temperature between 350° and 450° C. by the indirect process into the form of a case; (4) drawing out the resultant case hot then cold; (5) hot necking the drawn case between 350° and 450° C.; (6) solution annealing the hot necked case between 450° and 490° C. and quenching the case with water at a temperature below 40° C.; and (7) two step tempering (type T73) the quenched case.
Inventors
- 👤 Roger Develay
- 👤 Marc Anagnostidis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 02:34
CPC Classifications
C; C22; C22F; C22F1/00; C22F1/04; C22F1/053; B; B21; B21D; B21D51/00; B21D51/16; B21D51/24; F; F17; F17C; F17C2203/00; F17C2203/06; F17C2203/0634; F17C2203/0636; F17C2203/0646
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
154 words
A method of manufacturing a hollow body under pressure from an aluminum alloy, comprising the steps of: (1) preparing an alloy of a composition consisting of (by weight) 5.6≦Zn≦6.1, 2.0≦Mg≦2.4, 1.3≦Cu≦1.7, 0.15≦Cr≦0.25, Fe≦0.10, Fe+Si≦0.25, Mn≦0.04, Zr≦0.03, Ti≦0.04, with the remainder of the alloy being aluminum and impurities with the total amount of impurities being no more than 0.15 with the maximum amount of any given impurity being 0.05; (2) casting the alloy in the form of a billet; (3) hot extruding a billet at a temperature between 350° and 450° C. by the indirect process into the form of a case; (4) drawing out the resultant case hot then cold; (5) hot necking the drawn case between 350° and 450° C.; (6) solution annealing the hot necked case between 450°and 490° C. and quenching the case with water at a temperature below 40° C; and (7) two step tempering (type T73) the quenched case.
Claim 2
Independent Claim
154 words
A method of manufacturing a hollow body under pressure from an aluminum alloy, comprising the steps of: (1) preparing an alloy of a composition consisting of (by weight) 5.6≦Zn≦6.1, 2.0≦Mg≦2.4, 1.3≦Cu≦1.7, 0.15≦Cr≦0.25, Fe≦0.10, Fe+Si≦0.25, Mn≦0.04, Zr≦0.03, Ti≦0.04, with the remainder of the alloy being aluminum and impurities with the total amount of impurities being no more than 0.15 with the maximum amount of any given impurity being 0.05; (2) casting the alloy in the form of a billet; (3) hot extruding a billet at a temperature between 350° and 450° C. by the indirect process into the form of a case; (4) drawing out the resultant case hot then cold; (5) hot necking the drawn case between 350° and 450° C.; (6) solution annealing the hot necked case between 450°and 490° C. and quenching the case with water at a temperature below 40° C; and (7) two step tempering (type T73) the quenched case.
Claim 3
Dependent Claim
16 words
The method of claim 1, wherein the Fe content of said alloy ranges up to 0.08%.
Claim 4
Dependent Claim
18 words
The method of claim 1 or 2, wherein the Fe+Si content of said alloy ranges up to 0.18%.
Claim 5
Dependent Claim
55 words
The method of claim 1 or 2, wherein said drawn out case is hot ribbed at 400° C., pierced and cut, solution annealed at 465° C.±1.5° C. for 2 hours, quenched with cold water at 10°-20° C., tempered at 105° C.±2° C. for 6 hours and finally tempered at 177° C.±1.5° C. for 12 hours.
Claim 6
Independent Claim
128 words
A method of manufacturing a hollow body under pressure from an aluminum alloy, comprising the steps of: (1) preparing an alloy of a composition consisting of (by weight) 5.6≦Zn≦6.1, 2.0≦Mg≦2.4, 1.3≦Cu≦1.7, 0.15≦Cr≦0.25, Fe≦0.10, Fe+Si≦0.25, Mn≦0.04, Zr≦0.03, Ti≦0.04, with the remainder of the alloy being aluminum and impurities with the total amount of impurities being no more than 0.15 with the maximum amount of any given impurity being 0.05; (2) casting the alloy in the form of a billet; (3) cool extruding said billet; (4) hot necking the drawn case between 350° and 450° C; (5) solution annealing the hot necked case between 450° and 490° C. and quenching the case with water at a temperature below 40° C.; and (6) two step tempering (type T73) the quenched case.
Claim 7
Independent Claim
128 words
A method of manufacturing a hollow body under pressure from an aluminum alloy, comprising the steps of: (1) preparing an alloy of a composition consisting of (by weight) 5.6≦Zn≦6.1, 2.0≦Mg≦2.4, 1.3≦Cu≦1.7, 0.15≦Cr≦0.25, Fe≦0.10, Fe+Si≦0.25, Mn≦0.04, Zr≦0.03, Ti≦0.04, with the remainder of the alloy being aluminum and impurities with the total amount of impurities being no more than 0.15 with the maximum amount of any given impurity being 0.05; (2) casting the alloy in the form of a billet; (3) cool extruding said billet; (4) hot necking the drawn case between 350° and 450° C; (5) solution annealing the hot necked case between 450° and 490° C. and quenching the case with water at a temperature below 40° C.; and (6) two step tempering (type T73) the quenched case.
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) | 1987-03-27 | 1987-09-26 | 1988-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-03-27 | 1991-09-26 | 1992-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-03-27 | 1995-09-26 | 1996-03-27 | $7700.00 | Window Closed / Lapsed |