Patent US2346283A successfully refreshed from Google Patents.
Patent US4925346A successfully refreshed from Google Patents.
US4925346A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of increasing useful life of tool steel cutting tools
Assignee: Ford Motor Co
•
Filing: 1989-04-03
•
Granted: 1990-05-15
•
Expires: 2009-04-03
Abstract
Abstract The wear life of a high-speed tool steel cutting bit is increased by (a) cleansing the bit by subjection to an ion beam; (b) while preventing the temperature of said cleansed from rising above 350° C., coating the cleansed bit by condensing sputtered atoms of titanium and boron thereonto, the condensation being carried out to provide a coating thickness of 2-6 microns. An argon or krypton beam of ions is accelerated to 1300-1800 volts as a broad-beam ion source to sputter a titanium diboride target arranged as a cathode. The sputtering is carried out for 5-10 minutes while the bit is heated to about 200° C., and a soft vacuum of about 4-6 milli-torr is used during the process.
Inventors
- 👤 David Moskowitz
- 👤 David W. Hoffman
- 👤 Duane J. Schmatz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:30
CPC Classifications
C; C23; C23C; C23C14/00; C23C14/22; C23C14/34; C23C14/46; C23C14/02; C23C14/021; C23C14/022; Y; Y10; Y10T; Y10T407/00; Y10T407/27; Y10T408/00; Y10T408/03; Y10T408/78; Y10T82/00; Y10T82/10
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
44 words
A method of machining aluminum-based workpieces at high-speeds, comprising: moving an iron-based cutting tool against said aluminum-based workpiece at surface speeds exceeding 1000 sfm to continuously cut said workpiece, said tool having cutting surfaces coated with a single-phase crystal film of TiB 2 .
Claim 2
Independent Claim
44 words
A method of machining aluminum-based workpieces at high-speeds, comprising: moving an iron-based cutting tool against said aluminum-based workpiece at surface speeds exceeding 1000 sfm to continuously cut said workpiece, said tool having cutting surfaces coated with a single-phase crystal film of TiB 2 .
Claim 3
Independent Claim
91 words
A method of machining aluminum-based workpieces at high speeds, comprising: moving a cutting tool against said aluminum-based workpiece at surface speeds in excess of 1000 sfm to continuously machine the surface thereof, said tool having a cutting surface constituted of a substrate and a coating, the substrate being a steel with precipitated carbides and a martensitic microstructure induced by heat treatment, said coating being a single-phase crystal film of TiB 2 adhered to the substrate in a thickness sufficient to impact hardness to the substrate but prevent delamination under machining conditions.
Claim 4
Independent Claim
91 words
A method of machining aluminum-based workpieces at high speeds, comprising: moving a cutting tool against said aluminum-based workpiece at surface speeds in excess of 1000 sfm to continuously machine the surface thereof, said tool having a cutting surface constituted of a substrate and a coating, the substrate being a steel with precipitated carbides and a martensitic microstructure induced by heat treatment, said coating being a single-phase crystal film of TiB 2 adhered to the substrate in a thickness sufficient to impact hardness to the substrate but prevent delamination under machining conditions.
Claim 5
Dependent Claim
31 words
The method as in claim 2, in which said coating is 2-6 microns thick and effective to prevent any difference in thermal expansion or resistivity with said substrate from promoting delamination.
Claim 6
Dependent Claim
35 words
The method as in claim 2, in which said coating is about 3 microns thick whereby the machining life of said tool is at least 100% greater than an uncoated tool of the same substrate.
Claim 7
Dependent Claim
26 words
The method as in claim 3, in which said tool is moved at a surface speed of at least 2000 sfpm to carry out turning machining.
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) | 1993-05-14 | 1993-11-13 | 1994-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-05-14 | 1997-11-13 | 1998-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-05-14 | 2001-11-13 | 2002-05-15 | $7700.00 | Window Closed / Lapsed |