US4228670A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the isothermal forging of a work piece
Assignee: BBC Brown Boveri AG Switzerland
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Filing: 1978-10-26
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Granted: 1980-10-21
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Expires: 1998-10-26
Abstract
Abstract A process for the lubrication of a tool surface which comprises high pressure blast spraying a powder lubricant having a particle size of 0.6 to 1.5 μ at a spray pressure of 4 to 5 bar, onto the tool surface thereby producing a high temperature compacted coherent lubricant film on the surface while simultaneously smoothing, strengthening and compressively stressing the tool surface.
Inventors
- 👤 Christopher W. Corti
- 👤 Rolf Luthi
- 👤 Ernst Vogt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:21
CPC Classifications
C; C10; C10M; C10M103/00; C10M103/06; B; B21; B21J; B21J3/00; C10M2201/00; C10M2201/04; C10M2201/05; C10M2201/06; C10M2201/061; C10M2201/062; C10M2201/063; C10M2201/087; C10M2201/10; C10M2201/102; C10M2201/105; C10M2201/12; C10M2201/16; C10M2201/18; C10N; C10N2010/00; C10N2010/02; C10N2010/04; C10N2040/00; C10N2040/20; C10N2040/22; C10N2040/24; C10N2040/241; C10N2040/242; C10N2040/243; C10N2040/244; C10N2040/245; C10N2040/246; C10N2040/247; C10N2050/00; C10N2050/015; C10N2050/02
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
64 words
A process for the lubrication of a tool surface which comprises: high pressure blast spraying a powder lubricant comprising boron nitrite having a particle size of 0.6 to 1.5μ at a spray pressure of 4 to 5 bar, onto said tool surface thereby producing a high temperature compacted coherent lubricant film on said surface while simultaneously smoothing, strengthening and compressively stressing said tool surface.
Claim 2
Dependent Claim
64 words
A process for the lubrication of a tool surface which comprises: high pressure blast spraying a powder lubricant comprising boron nitrite having a particle size of 0.6 to 1.5μ at a spray pressure of 4 to 5 bar, onto said tool surface thereby producing a high temperature compacted coherent lubricant film on said surface while simultaneously smoothing, strengthening and compressively stressing said tool surface.
Claim 3
Dependent Claim
17 words
The process of claim 1 wherein said high-pressure blast spraying is effected using a sand blasting machine.
Claim 4
Dependent Claim
17 words
The process of claim 1 wherein said lubricant in powder form consists essentially of boron nitride powder.
Claim 5
Dependent Claim
31 words
The process of claim 1 wherein said lubricant in powder form is a mixture of 95 wt.% to 5 wt.% boron nitride and 5 wt.% to 95 wt.% boric acid powder.
Claim 6
Dependent Claim
28 words
The process of claim 1 wherein said lubricant in powder form is a mixture of 95 to 5 wt.% boron nitride and 5 to 95 wt.% borosilicate glass.
Claim 7
Dependent Claim
38 words
The process of claim 5 wherein said borosilicate glass has the composition: 8-60 wt.% SiO 2 2-14 wt.% Na 2 O max. 4 wt.% CaO 30-90 Wt.% B 2 O 3 max. 2 wt.% Al 2 O 3
Claim 8
Dependent Claim
25 words
The process of claim 1 wherein said lubricant is a mixture of 95 to 5 wt.% boron nitride and 5 to 95 wt.% borax powders.
Claim 9
Dependent Claim
24 words
The process of claim 1 wherein said lubricant comprises spherical glass or steel particles or mixtures thereof with a diameter of 0.2 to 1μ.
Claim 10
Dependent Claim
49 words
The process of claim 8 wherein said glass particles have a diameter of 0.3μ and said steel particles have a diameter of 0.4 to 0.6μ and wherein the proportion of said glass or said steel particles or mixtures thereof in the total powder mixture is 1 to 99 Wt.%.
Claim 11
Dependent Claim
16 words
The process according to claim 1 wherein the material of said tool is a molybdenum alloy.
Claim 12
Dependent Claim
12 words
The process of claim 1 wherein said tool is a forging die.
Claim 13
Dependent Claim
10 words
The lubricated tool obtained by the process of claim 1.
Claim 14
Dependent Claim
11 words
The lubricated forging die obtained by the process of claim 11.
References Cited (Backward Citations)
US3574658A
Cited
US3754976A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-10-21 | 1984-04-21 | 1984-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-10-21 | 1988-04-21 | 1988-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-10-21 | 1992-04-21 | 1992-10-21 | $7700.00 | Window Closed / Lapsed |