Patent US3973308A successfully refreshed from Google Patents.
US3973308A
Expired / Lapsed
US
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Cutting tool
Assignee: Santrade Ltd
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Filing: 1975-04-08
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Granted: 1976-08-10
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Expires: 1995-04-08
Abstract
Abstract The cutting insert of the present invention has such shape that use of the same in a machining operation creates a greater than conventional surface pressure on the contact surface of the insert, such pressure causing an extremely thin, localized, area of the contact surface to attain an elevated temperature creating a flow layer therein. Such area reduction is effected by the formation on the contact surfaces of the notches inside of the cutting edge of the insert.
Inventors
- 👤 Evert Gustav Lundgren
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:52
CPC Classifications
B; B23; B23B; B23B27/00; B23B27/14; B23B27/141; B23B27/143; B23B2200/00; B23B2200/32; B23B2200/323; Y; Y10; Y10T; Y10T407/00; Y10T407/23; Y10T407/235; Y10T407/24; Y10T407/245
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
127 words
In a cutting tool for chipforming machining of metal work-pieces, said tool (10) having at least one corner with at least one connected cutting edge (12) formed by the transition between side surfaces (13) and an end surface (14) of the cutting tool, said side surfaces being chip faces or contact surfaces (18) between the cutting tool (10) and the formed chip (17) in the cutting operation, said end surfaces (14) being clearance faces, the improved formation wherein the chip face (13) or the contact surface (18) has several depressions (19) or notches separated from each other and situated inside and spaced from the cutting edge (12), said depressions, when in contact with the chip, failing to break, plastically deform or otherwise work or form the chip.
Claim 2
Dependent Claim
127 words
In a cutting tool for chipforming machining of metal work-pieces, said tool (10) having at least one corner with at least one connected cutting edge (12) formed by the transition between side surfaces (13) and an end surface (14) of the cutting tool, said side surfaces being chip faces or contact surfaces (18) between the cutting tool (10) and the formed chip (17) in the cutting operation, said end surfaces (14) being clearance faces, the improved formation wherein the chip face (13) or the contact surface (18) has several depressions (19) or notches separated from each other and situated inside and spaced from the cutting edge (12), said depressions, when in contact with the chip, failing to break, plastically deform or otherwise work or form the chip.
Claim 3
Dependent Claim
27 words
In a cutting tool as defined in claim 1, the improvement wherein the longitudinal direction of the depressions (19) is essentially perpendicular to the cutting edge (12).
Claim 4
Dependent Claim
29 words
In a cutting tool as defined in claim 1, the improvement wherein the depressions (19) have decreasing width and/or depth in the direction of motion of the chip (17).
Claim 5
Dependent Claim
25 words
In a cutting tool as defined in claim 1, the improvement wherein the depressions (19) have a cross-section which is a segment of a circle.
References Cited (Backward Citations)
US3128804A
Cited
US2677170A
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US3792514A
Cited
US3815191A
Cited
US3827119A
Cited
US3885281A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-08-10 | 1980-02-09 | 1980-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-10 | 1984-02-09 | 1984-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-10 | 1988-02-09 | 1988-08-10 | $7700.00 | Window Closed / Lapsed |