US4375375A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Constant energy rate forming
Assignee: RTX Corp
•
Filing: 1981-10-30
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Granted: 1983-03-01
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Expires: 2001-10-30
Abstract
Abstract An improved method for hot working materials previously considered to be difficult or impossible to hot work is described. The method consists of varying the deformation conditions in order to achieve an essentially constant energy input, to the material being worked, on a time basis.
Inventors
- 👤 Anthony F. Giamei
- 👤 Robert E. Doiron
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:55
CPC Classifications
C; C22; C22F; C22F1/00; C21; C21D; C21D7/00; C21D7/13; Y; Y10; Y10S; Y10S72/00; Y10S72/709
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
65 words
A method for hot working materials selected from the group consisting of iron base superalloys, nickel base superalloys, cobalt base superalloys, titanium alloys, tool steels and refractory metals, which comprises hot working the material using dies which have been heated to the working temperature using a deformation rate which is adjusted so that the energy input the workpiece is substantially constant with respect to time.
Claim 2
Independent Claim
65 words
A method for hot working materials selected from the group consisting of iron base superalloys, nickel base superalloys, cobalt base superalloys, titanium alloys, tool steels and refractory metals, which comprises hot working the material using dies which have been heated to the working temperature using a deformation rate which is adjusted so that the energy input the workpiece is substantially constant with respect to time.
Claim 3
Dependent Claim
47 words
A method as in claim 1 in which the load applied to the material and the deformation of the material are integrated to produce an output signal which is proportionate to the energy input, said output signal being used to control the subsequent deformation of the material.
Claim 4
Dependent Claim
26 words
A method as in claim 1 in which the deformation is controlled by a preprogrammed controller so that the deformation proceeds at a constant energy rate.
Claim 5
Dependent Claim
36 words
A method as in claim 1 in which the energy input to the forming apparatus is monitored and controlled in such a fashion that the energy input to the material is maintained at a constant rate.
Claim 6
Dependent Claim
54 words
In a method for hot working nickel base superalloy articles which comprises hot working the articles using dies which have been heated to the working temperature at a constant strain rate for an initial amount of from about 0.2 to about 10% strain and subsequently working the articles under conditions of constant energy input.
Claim 7
Dependent Claim
54 words
In a method for hot working nickel base superalloy articles which comprises hot working the articles using dies which have been heated to the working temperature at a constant strain rate for an initial amount of from about 0.2 to about 10% strain and subsequently working the articles under conditions of constant energy input.
Claim 8
Dependent Claim
55 words
In an apparatus for hot working metal articles, the improvement which comprises stress sensing means, strain sensing means, and control means which integrate the prior stress and strain history of the material and controls this subsequent working of the material so that said subsequent working occurs under condition of constant energy input to the article.
Claim 9
Dependent Claim
55 words
In an apparatus for hot working metal articles, the improvement which comprises stress sensing means, strain sensing means, and control means which integrate the prior stress and strain history of the material and controls this subsequent working of the material so that said subsequent working occurs under condition of constant energy input to the article.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-02-28 | 1986-08-30 | 1987-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-02-28 | 1990-08-30 | 1991-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-02-28 | 1994-08-30 | 1995-03-01 | $7700.00 | Window Closed / Lapsed |