Patent US3579805A successfully refreshed from Google Patents.
US3579805A
Expired / Lapsed
US
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Method of forming interference fits by heat treatment
Assignee: General Electric Co
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Filing: 1968-07-05
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Granted: 1971-05-25
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Expires: 1988-07-05
Abstract
Abstract An interference fit can be provided between metal components where at least one of the components is formed of a precipitation-hardenable metal alloy which undergoes a substantially permanent dimensional change in addition to a reversible dimensional change upon heat treatment at elevated temperatures. The interference fit itself will be irreversible if both components are formed of the preciptitation-hardenable alloy and reversible if only one of the components is formed of the alloy.
Inventors
- 👤 Howard Berdolt Kast
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:12
CPC Classifications
C; C21; C21D; C21D6/00; C21D6/02; B; B23; B23P; B23P11/00; B23P11/02; B23P11/025; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49863; Y10T29/49865
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
98 words
A method for forming an interference fit between inner and outer members adapted to be interfitted, comprising the steps of: a. providing at least one of said members of a precipitationhardenable alloy which undergoes substantially irreversible dimensional change upon heat treatment thereof, b. solution annealing said precipitation-hardenable alloy at a temperature in excess of the solutioning temperature of said alloy, c. interfitting said members to form an assembly with a clearance between said members smaller than the substantially irreversible dimensional change, and d. subjecting said assembly to a precipitation-hardening heat treatment which causes said substantially irreversible dimensional change.
Claim 2
Independent Claim
98 words
A method for forming an interference fit between inner and outer members adapted to be interfitted, comprising the steps of: a. providing at least one of said members of a precipitationhardenable alloy which undergoes substantially irreversible dimensional change upon heat treatment thereof, b. solution annealing said precipitation-hardenable alloy at a temperature in excess of the solutioning temperature of said alloy, c. interfitting said members to form an assembly with a clearance between said members smaller than the substantially irreversible dimensional change, and d. subjecting said assembly to a precipitation-hardening heat treatment which causes said substantially irreversible dimensional change.
Claim 3
Dependent Claim
24 words
A method, as claimed in claim 1, wherein said precipitation-hardening heat treatment is accomplished at a temperature of from about 900* to 1,150* F.
Claim 4
Dependent Claim
23 words
A method, as claimed in claim 1, wherein said members are both formed of said precipitation-hardenable alloy and said interference fit is irreversible.
Claim 5
Dependent Claim
28 words
A method, as claimed in claim 3, including the additional step after solution annealing of said precipitatioN-hardenable alloy of cooling said alloy prior to interfitting of said members.
Claim 6
Dependent Claim
32 words
A method, as claimed in claim 4, wherein said dimensional change is a contraction and including the additional step of subjecting said inner member to a precipitation-hardening heat treatment after solution-annealing thereof.
Claim 7
Dependent Claim
33 words
A method, as claimed in claim 4, wherein said dimensional change is an expansion and including the additional step of subjecting said outer member to a precipitation-hardening heat treatment after solution annealing thereof.
Claim 8
Dependent Claim
36 words
A method, as claimed in claim 1 wherein one of said members is formed of said precipitation-hardenable alloy, the other of said members is formed of a conventional alloy, and said resulting interference fit is reversible.
Claim 9
Dependent Claim
27 words
A method, as claimed in claim 7, including the additional step after solution-annealing of said precipitation-hardenable alloy of cooling said alloy prior to interfitting of said members.
Claim 10
Dependent Claim
23 words
A method, as claimed in claim 8, wherein said dimensional change is a contraction and said outer member is formed of said alloy.
Claim 11
Dependent Claim
23 words
A method, as claimed in claim 8, wherein said dimensional change is an expansion and said inner member is formed of said alloy.
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) | 1974-05-24 | 1974-11-23 | 1975-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-24 | 1978-11-23 | 1979-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-24 | 1982-11-23 | 1983-05-25 | $7700.00 | Window Closed / Lapsed |