Patent DE698489C successfully refreshed from Google Patents.
Patent US3850705A successfully refreshed from Google Patents.
US3850705A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low oil-canning aluminum alloy forgings
Assignee: Alcoa Corp
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Filing: 1973-09-04
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Granted: 1974-11-26
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Expires: 1993-09-04
Abstract
Abstract The method of making a heat treated aluminum alloy forging exhibiting reduced ''''oil-canning'''' in ''''oil-canning''''-susceptible sections upon machining, including bonding insulation onto an ''''oil-canning''''-susceptible section of an age-hardenable aluminum alloy forging with a bonding agent effective for maintaining a bond during heating for solution heat treatment, solution heat treating the thus-insulated forging, and, with the insulation still on the section, subjecting the solution heat treated forging to a quench for maintaining precipitable components of the alloy in solution in the ''''oil-canning''''-susceptible section, whereby upon machining, said section will exhibit reduced ''''oilcanning.
Inventors
- 👤 C Furney
- 👤 R Couchman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:09
CPC Classifications
C; C22; C22F; C22F1/00; C22F1/04
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
67 words
A METHOD FOR MAKING A HEAT TREATED ALUMINUM ALLOY FORGING EXHIBITING REDUCED OIL-CANNING IN OIL-CANNINGSUSCEPTIBLE SECTIONS, COMPRISING THE STEPS OF BONDING INSULATION ONTO BOTH SIDES OF AN OIL-CANNING-SUSCEPTIBLE SECTION OF AN ALUMINUM ALLOY FORGING WITH A BONDING MEANS FOR MAINTAINING A BOND DURING HEATING FOR SOLUTION HEAT TREATMENT, SOLUTION HEAT TREATING THE THUS-INSULATED FORGING, AND, WITH THE INSULATION STILL ON SAID SECTION, SUBJECTING THE SOLUTION HEAT TREATED
Claim 2
Independent Claim
67 words
A METHOD FOR MAKING A HEAT TREATED ALUMINUM ALLOY FORGING EXHIBITING REDUCED OIL-CANNING IN OIL-CANNINGSUSCEPTIBLE SECTIONS, COMPRISING THE STEPS OF BONDING INSULATION ONTO BOTH SIDES OF AN OIL-CANNING-SUSCEPTIBLE SECTION OF AN ALUMINUM ALLOY FORGING WITH A BONDING MEANS FOR MAINTAINING A BOND DURING HEATING FOR SOLUTION HEAT TREATMENT, SOLUTION HEAT TREATING THE THUS-INSULATED FORGING, AND, WITH THE INSULATION STILL ON SAID SECTION, SUBJECTING THE SOLUTION HEAT TREATED
Claim 3
Dependent Claim
47 words
A method as claimed in claim 1, wherein the thickness of said section, 2L, and the surface heat transfer coefficient H of the insulation are related to the desired yield strength sigma of said section according to the following equations: delta n tan delta n HL/C'', 16.
Claim 4
Dependent Claim
44 words
A method as claimed in claim 2, wherein the average quench factor of sections surrounding said oil-canning-susceptible section are less than the average quench factor for said oil-canning-susceptible section, average quench factors being determined by the following equations: delta n tan delta n HL/C''16.
Claim 5
Dependent Claim
28 words
A method as claimed in claim 1 wherein said insulation results, during the quench, in the cooling of sections surrounding said oil-canning-susceptible section faster than said oil-canning-susceptible section.
Claim 6
Dependent Claim
29 words
A method as claimed in claim 1, further comprising a preliminary step of machining said oil-canning-susceptible section, the preliminary step of machining being performed before the step of bonding.
Claim 7
Dependent Claim
21 words
A method as claimed in claim 1, further comprising roughening the surface of said oil-canning-susceptible section before the step of bonding.
Claim 8
Dependent Claim
29 words
A method as claimed in claim 1, wherein said insulation and bonding means is, on a dry weight basis, 80 percent sodium silicate and 20 percent asbestos fiber shorts.
Claim 9
Dependent Claim
13 words
A method as claimed in claim 1, wherein said insulation is glass cloth.
Claim 10
Dependent Claim
16 words
A method as claimed in claim 1, further comprising, subsequent to quenching, machining said oil-canning-susceptible section.
Claim 11
Dependent Claim
17 words
A method as claimed in claim 9, further comprising, following the step of quenching, age-hardening the forging.
Claim 12
Dependent Claim
23 words
A method as claimed in claim 10, wherein the step of age-hardening is carried out before the step of machining subsequent to quenching.
Claim 13
Dependent Claim
30 words
A method as claimed in claim 10, wherein the forging has in said oil-canning-susceptible section, following the step of age-hardening, a yield strength equal to or greater than 56,000 psi.
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) | 1977-11-25 | 1978-05-27 | 1978-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-25 | 1982-05-27 | 1982-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-25 | 1986-05-27 | 1986-11-26 | $7700.00 | Window Closed / Lapsed |