US5235879A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tool of cemented carbide for cutting, punching or nibbling
Assignee: Sandvik AB
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Filing: 1991-12-06
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Granted: 1993-08-17
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Expires: 2011-12-06
Abstract
Abstract According to the invention there is provided a cemented carbide tool for punching, cutting and nibbling containing WC and with binder that comprises at least one of the metals Co, Ni and Fe. Moreover, it contsists of a core of eta-phase containing cemented carbide surrounded by an eta-phase free surface zone whose working surface comprises exposed eta-phase and a surrounding eta-phase free surface zone. <IMAGE>
Inventors
- 👤 Lars Drougge
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 10:01
CPC Classifications
C; C22; C22C; C22C29/00; C22C29/02; C22C29/06; C22C29/08; B; B22; B22F; B22F2998/00; Y; Y10; Y10T; Y10T407/00; Y10T407/27; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/24967; Y10T428/24975; Y10T428/31504; Y10T428/31678; Y10T83/00; Y10T83/04
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
61 words
A process of cutting, punching or nibbling using a cemented carbide tool containing WC (α-phase) with a binder (β-phase) based on at least one of the metals Co, Ni or Fe the improvement comprising using a cemented carbide core surrounded by an eta-phase-containing cemented carbide core surrounded by an eta-phase-free surface zone, the working surface of the tool comprising exposed eta-phase.
Claim 2
Dependent Claim
61 words
A process of cutting, punching or nibbling using a cemented carbide tool containing WC (α-phase) with a binder (β-phase) based on at least one of the metals Co, Ni or Fe the improvement comprising using a cemented carbide core surrounded by an eta-phase-containing cemented carbide core surrounded by an eta-phase-free surface zone, the working surface of the tool comprising exposed eta-phase.
Claim 3
Dependent Claim
22 words
The process of claim 1 wherein the working surface of the tool also comprises an eta-phase-free surface zone surrounding the exposed eta-phase.
Claim 4
Dependent Claim
15 words
The process of claim 2 wherein the width of the eta-phase-free zone is 0.3-10 mm.
Claim 5
Dependent Claim
16 words
The cemented process of claim 3 wherein the width of the eta-phase-free zone is 0.5-8 mm.
Claim 6
Dependent Claim
27 words
The process of claim 1 wherein the grain size of the eta-phase is 0.5-10 μm and the amount of eta-phase in the core is 2-60 vol %.
Claim 7
Dependent Claim
27 words
The process of claim 5 wherein the grain size of the eta-phase is 1-5 μm and the amount of eta-phase in the core is 10-35 vol %.
Claim 8
Dependent Claim
27 words
The process of claim 1 wherein the amount of binder in the outermost portion of the surface zone zone is 0.1-0.9 times the nominal content of binder.
Claim 9
Dependent Claim
27 words
The process of claim 7 wherein the amount of binder in the outermost portion of the surface zone zone is 0.2-0.7 times the nominal content of binder.
Claim 10
Dependent Claim
26 words
The process of claim 7 wherein the width of the said outermost portion of the surface zone if 0.2-0.8 times the width of the eta-phase-free zone.
Claim 11
Dependent Claim
26 words
The process of claim 9 wherein the width of the outermost portion of the surface zone zone is 0.3-0.7 times the width of the eta-phase-free zone.
Claim 12
Dependent Claim
56 words
The process of claim 1 wherein the inner part of the surface zone next to the eta-phase-containing core has a content of binder that is greater than the nominal content of binder and the binder content increases towards the core to at least 1.2 times of the nominal content of binder in the cemented carbide body.
Claim 13
Dependent Claim
56 words
The process of claim 11 wherein the inner part of the surface zone next to the eta-phase-containing core has a content of binder that is greater than the nominal content of binder and the binder content increases towards the core to at least 1.4-2.5 times of the nominal content of binder in the cemented carbide body.
References Cited (Backward Citations)
FR1282137A
Cited
US3909895A
Cited
US4359335A
Cited
US4610931A
Cited
GB2114041A
Cited
JPS59219122A
Cited
JPS6025605A
Cited
US4642003A
Cited
US4743515A
Cited
GB2179678A
Cited
US4843039A
Cited
US4731296A
Cited
US4705124A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-08-16 | 1997-02-15 | 1997-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-08-16 | 2001-02-15 | 2001-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-08-16 | 2005-02-15 | 2005-08-17 | $7700.00 | Window Closed / Lapsed |