US4466991A
Expired / Lapsed
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Cutting tool hardening method
Assignee: Vsesojuzny Nauchno-Issledovatelsky Institut Instrumenta
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Filing: 1983-02-01
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Granted: 1984-08-21
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Expires: 2003-02-01
Abstract
Abstract A cutting tool hardening method, according to which a tool to be hardened is heated in air to a temperature of 130° to 560° C. in order to produce an oxide film 200 to 10,000 Å thick on its surface which is then coated with a wear-resistant material by vacuum deposition.
Inventors
- 👤 Anatoly A. Andreev
- 👤 Alexei G. Gavrilov
- 👤 Galina K. Galitskaya
- 👤 Viktor P. Zhed
- 👤 Andrei K. Sinelschikov
- 👤 Valentin G. Padalka
- 👤 Vladimir T. Tolok
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:26
CPC Classifications
C; C23; C23C; C23C8/00; C23C8/06; C23C8/08; C23C8/10; C23C8/12; C23C8/14; C23C14/00; C23C14/02; C23C14/024; C23C26/00; C23C28/00; C23C28/04; C23C28/044; C23C30/00; C23C30/005
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
52 words
A cutting tool hardening method comprising the steps of preheating tools in air to a temperature of 130° to 560° C. during a period of time long enough to produce an oxide film 200 to 10,000 Å thick on their surface, and coating said tools with a wear-resistant material by vacuum deposition.
Claim 2
Dependent Claim
52 words
A cutting tool hardening method comprising the steps of preheating tools in air to a temperature of 130° to 560° C. during a period of time long enough to produce an oxide film 200 to 10,000 Å thick on their surface, and coating said tools with a wear-resistant material by vacuum deposition.
Claim 3
Dependent Claim
16 words
The method of claim 1, wherein said vacuum deposition is carried out under an inert atmosphere.
Claim 4
Dependent Claim
17 words
The method of claim 1, wherein said tools are first degreased and washed prior to said preheating.
Claim 5
Dependent Claim
16 words
The method of claim 1, wherein said preheating is carried out for 1 to 60 minutes.
Claim 6
Dependent Claim
24 words
The method of claim 1, wherein said preheating is carried out for 15 to 60 minutes at a temperature of 130° to 550° C.
Claim 7
Dependent Claim
23 words
The method of claim 2, wherein said inert atmosphere consists of nitrogen and the wear-resistant material deposited is titanium nitride or zirconium nitride.
Claim 8
Dependent Claim
16 words
The method of claim 6, wherein said tools are first degreased and washed prior to preheating.
Claim 9
Dependent Claim
16 words
The method of claim 4, wherein said vacuum deposition is carried out under an inert atmosphere.
Claim 10
Dependent Claim
17 words
The method of claim 8, wherein said tools are first degreased and washed prior to said preheating.
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) | 1987-08-21 | 1988-02-20 | 1988-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-08-21 | 1992-02-20 | 1992-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-08-21 | 1996-02-20 | 1996-08-21 | $7700.00 | Window Closed / Lapsed |