US3645804A
Expired / Lapsed
US
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Thermal treating control
Assignee: Alcoa Corp
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Filing: 1969-01-10
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Granted: 1972-02-29
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Expires: 1989-01-10
Abstract
Abstract A method for imparting to a metal or other body the predetermined effects of a specific thermal exposure at a preselected temperature T'', but where the actual temperature of the body varies during the treatment from the desired temperature T'', is provided by maintaining the treatment until the cumulative thermal effects reach a predetermined value. Also contemplated is an arrangement for measuring cumulative time and temperature effects during a thermal treatment wherein means are employed to provide a signal output which represents the thermal effect function based on the temperature which signal is fed to a means accumulating that signal and providing an additional signal upon reaching a predetermined accumulation.
Inventors
- 👤 Basil M Ponchel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:01
CPC Classifications
C; C22; C22F; C22F1/00
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
66 words
continuing the thermal treatment until the value of K in the following relation reaches a level predetermined for said body with respect to said certain property: E1t1+E2t2+E3t3+---Entn K where t is the period of time at temperature T and E is the predetermined correction factor for temperature T in terms of equivalent thermal effect at temperature T'' said effect predetermined with respect to said certain property,
Claim 2
Dependent Claim
36 words
In a process of thermally treating a metal body wherein a first property is enhanced while a second property is diminished during which treatment the metal temperature varies frOm a preselected temperature T'', the improvement comprising:
Claim 3
Dependent Claim
92 words
continuing the thermal treatment until the value of K in the following relation reaches a level predetermined for said body with respect to said first and second properties such that said first property is enhanced to a selected level and said second property is diminished to a minimum extent: E1t1+E2t2+E3t3+---Entn K where t is the period of time at temperature T and E is the predetermined correction factor for temperature T in terms of equivalent thermal effect at temperature T'' said effect predetermined with respect to at least one of said properties,
Claim 4
Dependent Claim
41 words
providing a signal output which represents E where E is the correction factor for the actual temperature T of the metal body in terms of equivalent thermal effect at temperature T'' predetermined for said body with respect to said certain property,
Claim 5
Dependent Claim
57 words
continuing the thermal treatment until the value of K in the following relation reaches a level corresponding to t'' E1t1+E2t2+E3t3+---Entn K where t is the period of time at temperature T, and E is the predetermined correction factor for temperature T in terms of equivalent thermal effect at temperature T'' said effect predetermined with respect to strength.
Claim 6
Dependent Claim
71 words
continuing the thermal treatment until the value of K in the following relation reaches a level predetermined for said body with respect to said certain property and corresponding to time t'': E1t1+E2t2+E3t3+---Entn K where t is the period of time at temperature T and E is the predetermined correction factor for temperature T in terms of equivalent thermal effect at temperature T'' said effect predetermined with respect to said certain property,
Claim 7
Dependent Claim
4 words
thereupon inTerrupting said treatment.
Claim 8
Dependent Claim
5 words
thereupon interrupting said artificial aging.
Claim 9
Dependent Claim
40 words
continuing the thermal treatment and accumulating said signal output until the accumulation reaches a value in accordance with the following relation wherein K corresponds to t'' E1t1+E2t2+E3t3+---Entn K where t is the period of time at actual metal temperature T,
Claim 10
Dependent Claim
4 words
thereupon interrupting said treatment.
Claim 11
Dependent Claim
54 words
In a process of thermally treating a metal body to impart thereto the effect on a certain property of a thermal exposure at a preselected temperature T'' for a time t'' and in which thermal treating process the actual metal temperature T of the body varies from the preselected temperature T'' the improvement comprising:
Claim 12
Dependent Claim
4 words
thereupon interrupting said treatment.
Claim 13
Dependent Claim
17 words
The method according to claim 3 wherein said E signal output is a continuously provided electrical signal.
Claim 14
Dependent Claim
4 words
thereupon interrupting said treatment.
Claim 15
Dependent Claim
67 words
In a process of thermally treating an aluminum body to impart thereto the effects on a certain property of a thermal exposure at a preselected temperature T'' for a time of t'' which temperature T'' follows within the range of 200* to 450* F. and in which thermally treating process the actual temperature T of the aluminum body varies from the preselected temperature T'' the improvement comprising:
Claim 16
Dependent Claim
60 words
In a process of artificially aging an aluminum alloy containing zinc, magnesium and copper to achieve high resistance to stress corrosion cracking while minimizing strength loss which effects would be achieved by a treatment at a preselected temperature of T'' for a time of t'' which temperature T'' falls within the range of 315* to 380* F., the improvement comprising:
Claim 17
Dependent Claim
17 words
The improvement according to claim 1 wherein the Et function is continuously monitored and the relation becomes:
Claim 18
Dependent Claim
27 words
The improvement according to claim 6 wherein in said relation in said step 2 E ex, A 27,942 and e is the base of the natural logarithm.
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) | 1975-02-28 | 1975-08-30 | 1976-02-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-28 | 1979-08-30 | 1980-02-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-28 | 1983-08-30 | 1984-02-29 | $7700.00 | Window Closed / Lapsed |