Patent US3800633A successfully refreshed from Google Patents.
US3800633A
Expired / Lapsed
US
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Method of manufacturing bimetallic high-speed cutting tools
Assignee: FUNASAW KK
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Filing: 1972-07-25
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Granted: 1974-04-02
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Expires: 1992-07-25
Abstract
Abstract A bimetallic high-speed cutting tool having a series of spaced teeth provided on one of its longitudinal edges is manufactured by providing each tooth at its forward top end with a cut-out portion on which a tip of super-hard material, molded before being sintered into a shape substantially equal to a desired final configuration, and having as cutting edges sharp square corners, is welded or brazed, so that the machining of said tip to said desired final configuration, after it has been welded or brazed to the tooth body is minimized, the super-hard materials constituting said tip being selected from those having such hardness and flexural strength as not to be affected by the heat applied thereto when the tip is welded or brazed firmly onto the tooth body.
Inventors
- 👤 T Funakubo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 07:54
CPC Classifications
B; B23; B23D; B23D61/00; B23D65/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
207 words
A method of producing a bimetallic high-speed cutting tool, which comprises forming on a base strip of flexible material a series of teeth which are spaced from one another along one of the longitudinal edges of said strip, providing a cut-out portion in each tooth that has an L-shaped configuration, when viewed in the longitudinal plane of the tooth, compacting a powdery super-hard material to a shape conforming approximately to the cut-out portion of each tooth, cutting the compacted material to the desired configuration, and then sintering the compacted material to form a cutting tip of generally truncated pyramidal shape, applying a brazing medium to the back and bottom portions of the cut-out portion of each tooth, heating the brazing medium, mounting a cutting tip on the cut-out portion of each tooth so that the bottom of the tip seats on the braze-coated bottom of said cut-out portion and the back of the tip seats against the braze-coated back of the cut-out portion, then heating the brazing medium to a higher temperature than the initial heat but below the melting temperature of the tip to braze the tip to the tooth on which it is seated, and then machining each tip to provide sharp cutting edges thereon.
Claim 2
Independent Claim
207 words
A method of producing a bimetallic high-speed cutting tool, which comprises forming on a base strip of flexible material a series of teeth which are spaced from one another along one of the longitudinal edges of said strip, providing a cut-out portion in each tooth that has an L-shaped configuration, when viewed in the longitudinal plane of the tooth, compacting a powdery super-hard material to a shape conforming approximately to the cut-out portion of each tooth, cutting the compacted material to the desired configuration, and then sintering the compacted material to form a cutting tip of generally truncated pyramidal shape, applying a brazing medium to the back and bottom portions of the cut-out portion of each tooth, heating the brazing medium, mounting a cutting tip on the cut-out portion of each tooth so that the bottom of the tip seats on the braze-coated bottom of said cut-out portion and the back of the tip seats against the braze-coated back of the cut-out portion, then heating the brazing medium to a higher temperature than the initial heat but below the melting temperature of the tip to braze the tip to the tooth on which it is seated, and then machining each tip to provide sharp cutting edges thereon.
Claim 3
Dependent Claim
55 words
A method of producing a high speed cutting tool as claimed in claim 1, wherein the tips are initially molded to be slightly wider than the cut-out portions of the flexible base strip, and machining each tip, after it has been brazed to the associated cut-out portion to conform it precisely to the desired configuration.
Claim 4
Dependent Claim
73 words
A method of producing a high-speed cutting tool as claimed in claim 2, wherein the tips have a Vickers hardness of about 1,300 Hv. to 1,500 Hv. and a flexural strength of about 210 Kg./mm2 to 160 Kg/mm2, the brazing medium has a Vickers hardness of about 450 Hv. to 500 Hv., and the brazing medium is initially heated up to about 800* C., and the brazing is effected at about 1,300* C.
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) | 1977-04-01 | 1977-10-01 | 1978-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-01 | 1981-10-01 | 1982-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-01 | 1985-10-01 | 1986-04-02 | $7700.00 | Window Closed / Lapsed |