US5232318A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coated cutting tools
Assignee: Kennametal Inc
•
Filing: 1991-08-29
•
Granted: 1993-08-03
•
Expires: 2011-08-29
Abstract
Abstract Provided is a coated cutting tool having a coating and a substrate. The coating includes at least one CVD layer which may have a residual tensile stress and at least one layer having a high residual compressive stress. The outermost layer of the coating is preferably the one containing residual compressive stresses. The substrate is a composite having hard refractory grains.
Inventors
- 👤 Anakkavur T. Santhanam
- 👤 Rajendra V. Godse
- 👤 Dennis T. Quinto
- 👤 Kenneth E. Undercoffer
- 👤 Prem C. Jindal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 19:14
CPC Classifications
B; B23; B23B; B23B27/00; B23B27/14; B23B27/148; C; C23; C23C; C23C14/00; C23C14/06; C23C14/0641; C23C14/0664; C23C16/00; C23C16/22; C23C16/30; C23C16/34; C23C16/36; Y; Y10; Y10T; Y10T407/00; Y10T407/27; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/31504; Y10T428/31678
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
92 words
A cutting tool comprising: a rake face and a flank face; a cutting edge at a junction of said rake face and said flank face; said cutting tool having a coating and a substrate, wherein said coating is bonded to said substrate; wherein said substrate is a composite having hard refractory grains bonded together by a binder material; said coating having a number of layers; said layers including a first layer which is a CVD layer and a second layer having a residual compressive stress which exceeds about 60 kg/mm 2 .
Claim 2
Dependent Claim
92 words
A cutting tool comprising: a rake face and a flank face; a cutting edge at a junction of said rake face and said flank face; said cutting tool having a coating and a substrate, wherein said coating is bonded to said substrate; wherein said substrate is a composite having hard refractory grains bonded together by a binder material; said coating having a number of layers; said layers including a first layer which is a CVD layer and a second layer having a residual compressive stress which exceeds about 60 kg/mm 2 .
Claim 3
Dependent Claim
36 words
The cutting tool according to claim 1 wherein said first layer includes a layer composed of a hard nitride selected from the group consisting of Ti, Hf, Zr, their alloys with each other and other elements.
Claim 4
Dependent Claim
17 words
The cutting tool according to claim 2 wherein the hard nitride layer is adjacent to said substrate.
Claim 5
Dependent Claim
43 words
The cutting tool according to claim 1 wherein said first layer includes a layer composed of a hard carbonitride selected from the group consisting of the carbonitrides of Ti, Hf, Zr and their alloys with each other and their alloys with other elements.
Claim 6
Dependent Claim
48 words
The cutting tool according to claim 3 further comprising a third layer in a state of residual tensile stress composed of a hard carbonitride selected from the group consisting of the carbonitrides of Ti, Hf, Zr and their alloys with each other and their alloys with other elements.
Claim 7
Dependent Claim
37 words
The cutting tool according to claim 1 wherein said second layer is selected from the group consisting of the nitrides and carbonitrides of Ti, Zr, Hf, their alloys with each other, and their alloys with other elements.
Claim 8
Dependent Claim
37 words
The cutting tool according to claim 2 wherein said second layer is selected from the group consisting of the nitrides and carbonitrides of Ti, Zr, Hf, their alloys with each other, and their alloys with other elements.
Claim 9
Dependent Claim
37 words
The cutting tool according to claim 3 wherein said second layer is selected from the group consisting of the nitrides and carbonitrides of Ti, Zr, Hf, their alloys with each other, and their alloys with other elements.
Claim 10
Dependent Claim
37 words
The cutting tool according to claim 4 wherein said second layer is selected from the group consisting of the nitrides and carbonitrides of Ti, Zr, Hf, their alloys with each other, and their alloys with other elements.
Claim 11
Dependent Claim
37 words
The cutting tool according to claim 5 wherein said second layer is selected from the group consisting of the nitrides and carbonitrides of Ti, Zr, Hf, their alloys with each other, and their alloys with other elements.
Claim 12
Dependent Claim
102 words
A cutting tool comprising: a rake face and a flank face; a cutting edge at a junction of said rake face and said flank face; said cutting tool having a coating and a substrate; wherein said substrate is a tungsten carbide based cemented carbide having a bulk composition including: 0-12 weight percent Ta; 0-6 weight percent Nb; 0-10 weight percent Ti; 5-15 weight percent Co; said coating having a number of layers; said layers including at least one layer which is a CVD layer and at least one layer in a state of residual compressive stress exceeding about 60 kg/mm 2 .
Claim 13
Dependent Claim
102 words
A cutting tool comprising: a rake face and a flank face; a cutting edge at a junction of said rake face and said flank face; said cutting tool having a coating and a substrate; wherein said substrate is a tungsten carbide based cemented carbide having a bulk composition including: 0-12 weight percent Ta; 0-6 weight percent Nb; 0-10 weight percent Ti; 5-15 weight percent Co; said coating having a number of layers; said layers including at least one layer which is a CVD layer and at least one layer in a state of residual compressive stress exceeding about 60 kg/mm 2 .
Claim 14
Dependent Claim
20 words
The cutting tool according to claim 11 wherein cobalt is present at a level of 7 to 13 weight percent.
Claim 15
Dependent Claim
20 words
The cutting tool according to claim 11 wherein cobalt is present at a level of 8 to 12 weight percent.
Claim 16
Dependent Claim
24 words
The cutting tool according to claim 11 wherein said layer in a state of residual compressive stress is the outermost layer in said coating.
Claim 17
Dependent Claim
23 words
The cutting tool according to claim 1 wherein the outermost layer of said first layer and said second layer is said second layer.
Claim 18
Dependent Claim
19 words
The cutting tool according to claim 1 wherein said CVD layer is in a state of residual tensile stress.
Claim 19
Dependent Claim
24 words
The cutting tool according to claim 1 wherein said second layer has a compressive residual stress of at least about 130 kg/mm 2 .
Claim 20
Dependent Claim
25 words
The cutting tool according to claim 1 said second layer has a compressive residual stress of between about 60 to about 340 kg/mm 2 .
Claim 21
Dependent Claim
25 words
The cutting tool according to claim 1 wherein the second layer has a compressive residual stress between about 130 to about 270 kg/mm 2 .
Claim 22
Dependent Claim
19 words
The cutting tool according to claim 11 wherein said CVD layer is in a state of residual tensile stress.
Claim 23
Dependent Claim
24 words
The cutting tool according to claim 11 wherein said second layer has a compressive residual stress of at least about 130 kg/mm 2 .
Claim 24
Dependent Claim
26 words
The cutting tool according to claim 11 wherein said second layer has a compressive residual stress of between about 60 to about 340 kg/mm 2 .
Claim 25
Dependent Claim
25 words
The cutting tool according to claim 11 wherein the second layer has a compressive residual stress between about 130 to about 270 kg/mm 2 .
Claim 26
Dependent Claim
19 words
The cutting tool according to claim 1 wherein the second layer is characterized by an absence of thermal cracks.
Claim 27
Dependent Claim
25 words
The cutting tool according to claim 11 wherein said layer in a state of residual compressive stress is characterized by an absence of thermal cracks.
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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) | 1996-08-02 | 1997-02-01 | 1997-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-08-02 | 2001-02-01 | 2001-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-08-02 | 2005-02-01 | 2005-08-03 | $7700.00 | Window Closed / Lapsed |