Patent US5776588A successfully refreshed from Google Patents.
US5776588A
Expired / Lapsed
US
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Coated hard alloy tool
Assignee: Sumitomo Electric Industries Ltd
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Filing: 1996-08-01
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Granted: 1998-07-07
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Expires: 2016-08-01
Abstract
Abstract An improved coated hard alloy tool having a substrate made of a hard alloy, and a multi-layer ceramic coating film provided on the surface of the substrate, the coating film including at least one oxide layer. The top several layers of the coating film are missing partially or completely in an area where the tool is brought into frictional contact with a workpiece. At least one oxide layer (such as Al2O3 layer) is included in the missing layers. This increases wear resistance of the coated hard alloy tool.
Inventors
- 👤 Hideki Moriguchi
- 👤 Daisuke Murakami
- 👤 Akihiko Ikegaya
- 👤 Toshio Nomura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 19:30
CPC Classifications
C; C23; C23C; C23C16/00; C23C16/56; B; B23; B23B; B23B27/00; B23B27/14; B23B27/141; B23B27/145; C23C16/22; C23C16/30; C23C16/40; C23C16/403; C23C30/00; C23C30/005; B23B2200/00; B23B2200/20; B23B2200/202; B23B2224/00; B23B2224/04; B23B2224/32; B23B2224/36; B23C; B23C2200/00; B23C2200/20; B23C2200/201; B23C2200/203; B23C2200/24; B23C2200/243; B23C2224/00; B23C2224/04; B23C2224/32; B23C2224/36; Y; Y10; Y10T; Y10T407/00; Y10T407/27; Y10T407/28; Y10T408/00; Y10T408/78; Y10T408/81; Y10T428/00; Y10T428/24; Y10T428/24355; Y10T428/24372; Y10T428/24413; Y10T428/24802; Y10T428/24926
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
109 words
A coated hard alloy tool having a cutting edge including a ridge and comprising a substrate made of a hard alloy, and a multi-layer ceramic coating film provided on the surface of said substrate, said coating film including at least one oxide layer and at least one non-oxide layer, the top several layers of said coating film being missing partially or completely along said ridge, at least one oxide layer being included in missing layers among said top several layers, whereby a non-oxide layer, whose main component is a nitride or a carbonitride, of said coating film is exposed along said ridge where said top several layers are missing.
Claim 2
Dependent Claim
109 words
A coated hard alloy tool having a cutting edge including a ridge and comprising a substrate made of a hard alloy, and a multi-layer ceramic coating film provided on the surface of said substrate, said coating film including at least one oxide layer and at least one non-oxide layer, the top several layers of said coating film being missing partially or completely along said ridge, at least one oxide layer being included in missing layers among said top several layers, whereby a non-oxide layer, whose main component is a nitride or a carbonitride, of said coating film is exposed along said ridge where said top several layers are missing.
Claim 3
Dependent Claim
42 words
A coated hard alloy tool as claimed in claim 1 wherein said at least one oxide layer included in said top several layers is an Al 2 O 3 layer or a layer whose main component is Al 2 O 3 .
Claim 4
Dependent Claim
25 words
A coated hard alloy tool as claimed in claim 1 wherein all of oxide layers included along said coating film are removed in said ridge.
Claim 5
Dependent Claim
40 words
A coated hard alloy tool as claimed in claim 1 wherein said layer exposed along said ridge where said top several layers are missing is a layer of TiCN having a mol fraction of C:N of between 5:5 and 7:3.
Claim 6
Dependent Claim
35 words
A coated hard alloy tool as claimed in claim 1 wherein said layer exposed along said ridge where said top several layers are missing has a residual stress of -5 to 10 kgf/mm 2 .
Claim 7
Dependent Claim
35 words
A coated hard alloy tool as claimed in claim 1 wherein said layer exposed along said ridge where said top several layers are missing has an average surface roughness Ra not more than 0.05 μm.
References Cited (Backward Citations)
US4643620A
Cited
US4755399A
Cited
US4720437A
Cited
US4966501A
Cited
US5431072A
Cited
US4984940A
Cited
US5250367A
Cited
JPH05111810A
Cited
US5597272A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-07-06 | 2002-01-05 | 2002-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-07-06 | 2006-01-05 | 2006-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-07-06 | 2010-01-05 | 2010-07-07 | $7700.00 | Window Closed / Lapsed |