US4268322A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stress relief of aluminium rings
Assignee: Daniel Doncaster and Sons Ltd
•
Filing: 1979-07-16
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Granted: 1981-05-19
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Expires: 1999-07-16
Abstract
Abstract A method for producing aluminum rings without developing undesirable residual stresses. A hot ring blank is ring rolled to a diametric size ranging approximately between 1% and 3% smaller than the desired dimensions of the finished ring. The ring is subsequently heated, quenched, subjected to cold ring working, and then aged prior to final machining.
Inventors
- 👤 Alan W. Willis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:46
CPC Classifications
C; C22; C22F; C22F1/00; C22F1/04; B; B21; B21H; B21H1/00; B21H1/06
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
80 words
A continuous nonhydraulic stress-relieving process for the production of aluminium alloy rings, the process comprising ring rolling a hot ring blank of the aluminum alloy to a diametric size between 1% and 3% smaller than the desired dimensions of the finished ring, heating the ring to above the solidus point of the alloy, quenching the ring, cold ring rolling the ring to the desired dimension to relieve residual stresses in the alloy, and aging the ring prior to final machining.
Claim 2
Dependent Claim
80 words
A continuous nonhydraulic stress-relieving process for the production of aluminium alloy rings, the process comprising ring rolling a hot ring blank of the aluminum alloy to a diametric size between 1% and 3% smaller than the desired dimensions of the finished ring, heating the ring to above the solidus point of the alloy, quenching the ring, cold ring rolling the ring to the desired dimension to relieve residual stresses in the alloy, and aging the ring prior to final machining.
Claim 3
Dependent Claim
18 words
The process according to claim 1 wherein the cold ring rolling step is carried out at room temperature.
Claim 4
Dependent Claim
22 words
The process according to claims 1 or 2 wherein the cold ring rolling step is carried out within 24 hours of quenching.
Claim 5
Dependent Claim
17 words
The process as claimed in claims 1 or 2 wherein the ring is rough machined before aging.
Claim 6
Dependent Claim
19 words
The process as claimed in claims 1 or 2 wherein the ring is made from aluminum alloy number 2014.
Claim 7
Dependent Claim
14 words
The process according to claim 3 wherein the ring is rough machined before aging.
Claim 8
Dependent Claim
16 words
The process according to claim 3 wherein the ring is made from aluminum alloy number 2014.
Claim 9
Dependent Claim
16 words
The process according to claim 4 wherein the ring is made from aluminum alloy number 2014.
Claim 10
Dependent Claim
18 words
The process according to claims 1 or 2 wherein the ring is made from aluminium alloy number 2618.
Claim 11
Dependent Claim
16 words
The process according to claim 3 wherein the ring is made from aluminium alloy number 2618.
Claim 12
Dependent Claim
16 words
The process according to claim 4 wherein the ring is made from aluminium alloy number 2618.
References Cited (Backward Citations)
GB924443A
Cited
GB1544937A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-05-18 | 1984-11-17 | 1985-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-05-18 | 1988-11-17 | 1989-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-05-18 | 1992-11-17 | 1993-05-19 | $7700.00 | Window Closed / Lapsed |