Patent US3925067A successfully refreshed from Google Patents.
US3925067A
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High strength aluminum base casting alloys possessing improved machinability
Assignee: Rio Tinto Switzerland AG
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Filing: 1974-11-04
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Granted: 1975-12-09
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Expires: 1994-11-04
Abstract
Abstract An aluminum base casting alloy possessing improved machinability comprising from about 3.5 to about 6.0% copper, from about 0.5 to 3.0% silver, up to about 1% manganese, from about 0.15 to about 0.90% magnesium, up to about 0.20% silicon, up to about 0.20% iron, from about 0.4 to about 0.7% bismuth, from about 0.4 to about 0.7% lead and the remainder aluminum.
Inventors
- 👤 Philip R Sperry
- 👤 Derek E Tyler
- 👤 Leon Butzky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:30
CPC Classifications
C; C22; C22C; C22C21/00; C22C21/12; C22C21/16
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
64 words
AN ALUMINUM BASE CASTING ALLOY POSSESSING IMPROVED MACHINABILITY CONSISTING ESSENTIALLY OF FROM ABOUT 3.5 TO ABOUT 6.0% COPPER, FROM ABOUT 0.5 TO 3.0% SILVER, UP TO ABOUT 1% MANGANESE, FROM ABOUT 0.15 TO ABOUT 0.90% MANGNESIUM, UP TO ABOUT 0.20% SILICON, UP TO ABOUT 0.20% IRON, FROM ABOUT 0.4 TO ABOUT 0.7% BISMUTH, FROM ABOUT 0.4 TO ABOUT 0.7% LEAD AND THE REMAINDER ALUMINUM.
Claim 2
Dependent Claim
64 words
AN ALUMINUM BASE CASTING ALLOY POSSESSING IMPROVED MACHINABILITY CONSISTING ESSENTIALLY OF FROM ABOUT 3.5 TO ABOUT 6.0% COPPER, FROM ABOUT 0.5 TO 3.0% SILVER, UP TO ABOUT 1% MANGANESE, FROM ABOUT 0.15 TO ABOUT 0.90% MANGNESIUM, UP TO ABOUT 0.20% SILICON, UP TO ABOUT 0.20% IRON, FROM ABOUT 0.4 TO ABOUT 0.7% BISMUTH, FROM ABOUT 0.4 TO ABOUT 0.7% LEAD AND THE REMAINDER ALUMINUM.
Claim 3
Dependent Claim
27 words
The alloy of claim 1 which further comprises from about 0.15 to about 0.7% titanium for grain refinement, and up to about 0.35% chromium for improved ductility.
Claim 4
Dependent Claim
29 words
The alloy of claim 1 wherein said copper is from 4.0 to 5.3%, said silver is from 0.5 to 1% and said magnesium is from about 0.20 to 85%.
Claim 5
Dependent Claim
21 words
The alloy of claim 3 wherein said lead and said bismuth are each present in amounts of about 0.4 to 0.6%.
Claim 6
Dependent Claim
82 words
An aluminum base casting alloy possessing improved machinability which consists essentially of from about 3.5 to about 6.0% copper, from about 0.05 to 3.0% silver, from about 0.2 to about 0.8% manganese, from about 0.15 to about 0.90% magnesium as a strengthening agent, from about 0.15 to about 0.7% titanium as a grain refiner, up to about 0.20% silicon, up to about 0.20% iron, from about 0.4 to about 0.7% bismuth, from about 0.4 to about 0.7% lead and the remainder aluminum.
Claim 7
Dependent Claim
82 words
An aluminum base casting alloy possessing improved machinability which consists essentially of from about 3.5 to about 6.0% copper, from about 0.05 to 3.0% silver, from about 0.2 to about 0.8% manganese, from about 0.15 to about 0.90% magnesium as a strengthening agent, from about 0.15 to about 0.7% titanium as a grain refiner, up to about 0.20% silicon, up to about 0.20% iron, from about 0.4 to about 0.7% bismuth, from about 0.4 to about 0.7% lead and the remainder aluminum.
Claim 8
Dependent Claim
77 words
The alloy of claim 5 comprising from about 4.2 to 4.5% copper, from about 0.5 to 0.6% silver, from about 0.2 to 0.3% manganese, from about 0.20 to about 0.85% magnesium, from about 0.20 to about 0.35% chromium, from about 0.020 to about 0.035% silicon, from about 0.030 to about 0.070% iron, from about 0.20 to about 0.30% titanium, from about 0.4 to about 0.6% lead, from about 0.4 to about 0.6% bismuth and the remainder aluminum.
Claim 9
Independent Claim
107 words
A method of preparing an aluminum base alloy casting possessing improved strength and machinability which comprises: A. casting ingot form an aluminum base alloy consisting essentially of from about 3.5 to about 6.0% copper, from about 0.5 to 3.0% silver, up to about 1% manganese, from about 0.15 to about 0.90% magnesium, up to about 0.20% silicon, up to 0.20% iron, from about 0.4 to about 0.7% bismuth, from about 0.4 to about 0.7% lead, remainder aluminum; B. remelting the ingot prepared in step A, and finally casting the resultant melt; and C. heat treating the final casting of step B to improve the tensile properties thereof.
Claim 10
Independent Claim
107 words
A method of preparing an aluminum base alloy casting possessing improved strength and machinability which comprises: A. casting ingot form an aluminum base alloy consisting essentially of from about 3.5 to about 6.0% copper, from about 0.5 to 3.0% silver, up to about 1% manganese, from about 0.15 to about 0.90% magnesium, up to about 0.20% silicon, up to 0.20% iron, from about 0.4 to about 0.7% bismuth, from about 0.4 to about 0.7% lead, remainder aluminum; B. remelting the ingot prepared in step A, and finally casting the resultant melt; and C. heat treating the final casting of step B to improve the tensile properties thereof.
Claim 11
Dependent Claim
22 words
The method of claim 7 wherein the heat treatment of step C comprises a solution heat treatment, quench and an aging treatment.
References Cited (Backward Citations)
US3475166A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-08 | 1979-06-09 | 1979-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-08 | 1983-06-09 | 1983-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-08 | 1987-06-09 | 1987-12-09 | $7700.00 | Window Closed / Lapsed |