Patent US5030038A successfully refreshed from Google Patents.
US5030038A
Expired / Lapsed
US
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Hobbing tool for finishing gears
Assignee: Azumi Ltd
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Filing: 1989-10-16
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Granted: 1991-07-09
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Expires: 2009-10-16
Abstract
Abstract A hobbing tool made of cermet composed of 70 to 97 percent by weight of hard phase and a binder phase. The hard phase is made of a composite carbonitride of transition metals including titanium and tungsten, and at least one other element. The binder phase contains nickel and/or cobalt and inevitable impurities. The ratio between nitride atoms and carbon atoms and the ratio between titanium atoms and the atoms of transition metals other than titanium in the hard phase should be within specific ranges. The cermet having the above composition has an increased toughness and an excellent resistance to heat and wear and is difficult to weld.
Inventors
- 👤 Yasutsune Ariura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 01:19
CPC Classifications
B; B23; B23F; B23F21/00; B23F21/12; B23F21/16; B23F21/163; C; C22; C22C; C22C29/00; C22C29/02; C22C29/04; Y; Y10; Y10T; Y10T407/00; Y10T407/17; Y10T407/1715; Y10T407/173; Y10T407/27; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/12028; Y10T428/12049; Y10T428/12056
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
139 words
A hobbing tool for finishing gears, said tool having a cutting edge made of a cermet comprising 70 to 99 percent by weight of a hard phase, the balance being a binder phase, said hard phase comprising a composite carbonitride including titanium and tungsten and at least one transition metal selected from the group consisting of zirconium, hafnium, vanadium, niobium, tantalum, chromium and molybdenum, said binder phase comprising nickel and/or cobalt and inevitable impurities, the ratio between nitrigen atoms and carbon atoms, that is, N/(C+N), and the ratio between titanium atoms and atoms of a transition metal M other than titanium in the hard phase, that is, M/(Ti+M), meeting one of the following two conditions; (a) N/(C+N) is 0.2 to 0.6 whereas M/(Ti+M) is 0.05 to 0.4 (b) N/(C+N) is 0.05 to 0.25 whereas M/(Ti+M) is 0.4 to 0.6.
Claim 2
Dependent Claim
139 words
A hobbing tool for finishing gears, said tool having a cutting edge made of a cermet comprising 70 to 99 percent by weight of a hard phase, the balance being a binder phase, said hard phase comprising a composite carbonitride including titanium and tungsten and at least one transition metal selected from the group consisting of zirconium, hafnium, vanadium, niobium, tantalum, chromium and molybdenum, said binder phase comprising nickel and/or cobalt and inevitable impurities, the ratio between nitrigen atoms and carbon atoms, that is, N/(C+N), and the ratio between titanium atoms and atoms of a transition metal M other than titanium in the hard phase, that is, M/(Ti+M), meeting one of the following two conditions; (a) N/(C+N) is 0.2 to 0.6 whereas M/(Ti+M) is 0.05 to 0.4 (b) N/(C+N) is 0.05 to 0.25 whereas M/(Ti+M) is 0.4 to 0.6.
Claim 3
Dependent Claim
30 words
A hobbing tool as claimed in claim 1, wherein the cutting edge is formed on the flank with a flat land extending in the direction of rotation of the gear.
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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) | 1994-07-08 | 1995-01-07 | 1995-07-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-07-08 | 1999-01-07 | 1999-07-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-07-08 | 2003-01-07 | 2003-07-09 | $7700.00 | Window Closed / Lapsed |