US3882580A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cutting insert
Assignee: Sandvik AB
•
Filing: 1973-11-23
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Granted: 1975-05-13
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Expires: 1993-11-23
Abstract
Abstract In a cutting insert having a cutting corner and associated cutting edge, together with a chip-breaking groove in the chip face of the insert, the improvement consists in giving a part of the cutting edge and associated chip-breaker a smaller rake angle than that of that part of the insert which is essentially active during a cutting operation.
Inventors
- 👤 Evert Gustav Lundgren
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 19:23
CPC Classifications
B; B23; B23B; B23B27/00; B23B27/14; B23B27/141; B23B27/143; B23B2200/00; B23B2200/08; B23B2200/083; B23B2200/20; B23B2200/202; Y; Y10; Y10T; Y10T407/00; Y10T407/23; Y10T407/235; Y10T407/24; Y10T407/245
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
179 words
In a cutting insert, for chipforming machining of preferably metal work-pieces, having at least one cutting corner (17, 24) from which extends one or more cutting edges (18) provided with a chip-breaker in the form of a groove (19) alongside the cutting edge, the groove being formed in a major or chip face of the insert, only a part (13, 14) of the cutting edge, which part comprises the cutting corner and the adjacent area, normally being engaged with the work-piece (10) during the greater part of the cutting operation, the improvement wherein the insert is strengthened which improvement consists essentially in that that part of the edge which is not engaged has a smaller rake angle (top rake) gamma than the part of the insert edge that is essentially active during the cutting operation and in that said rake angle gamma decreases continuously along the cutting edge in the direction from the cutting corner within a significant transition range starting at a distance from the corner of onefourth to one-third of the total length of the insert side.
Claim 2
Dependent Claim
179 words
In a cutting insert, for chipforming machining of preferably metal work-pieces, having at least one cutting corner (17, 24) from which extends one or more cutting edges (18) provided with a chip-breaker in the form of a groove (19) alongside the cutting edge, the groove being formed in a major or chip face of the insert, only a part (13, 14) of the cutting edge, which part comprises the cutting corner and the adjacent area, normally being engaged with the work-piece (10) during the greater part of the cutting operation, the improvement wherein the insert is strengthened which improvement consists essentially in that that part of the edge which is not engaged has a smaller rake angle (top rake) gamma than the part of the insert edge that is essentially active during the cutting operation and in that said rake angle gamma decreases continuously along the cutting edge in the direction from the cutting corner within a significant transition range starting at a distance from the corner of onefourth to one-third of the total length of the insert side.
Claim 3
Dependent Claim
171 words
In a cutting insert, for chipforming machining of preferably metal work-pieces, having at least one cutting corner (17, 24) from which extends one or more cutting edges (18) provided with a chip-breaker in the form of a groove (19) alongside the cutting edge, the groove being formed in a major or chip face of the insert, only a part (13, 14) of the cutting edge, which part comprises the cutting corner and the adjacent area, normally being engaged with the work-piece (10) during the greater part of the cutting operation, the improvement wherein the insert is strengthened which improvement consists essentially in providing that part of the edge which is not engaged with a negative strengthening face (22) and in continuously decreasing the rake angle along the cutting edge in the rake angle gamma decreases continuously along the cutting edge in the direction from the cutting corner within a significant transition range starting at a distance from the corner of one-fourth to one-third of the total length of the insert side.
Claim 4
Dependent Claim
171 words
In a cutting insert, for chipforming machining of preferably metal work-pieces, having at least one cutting corner (17, 24) from which extends one or more cutting edges (18) provided with a chip-breaker in the form of a groove (19) alongside the cutting edge, the groove being formed in a major or chip face of the insert, only a part (13, 14) of the cutting edge, which part comprises the cutting corner and the adjacent area, normally being engaged with the work-piece (10) during the greater part of the cutting operation, the improvement wherein the insert is strengthened which improvement consists essentially in providing that part of the edge which is not engaged with a negative strengthening face (22) and in continuously decreasing the rake angle along the cutting edge in the rake angle gamma decreases continuously along the cutting edge in the direction from the cutting corner within a significant transition range starting at a distance from the corner of one-fourth to one-third of the total length of the insert side.
Claim 5
Dependent Claim
46 words
Cutting insert according to claim 1, in which the width of the negative strengthening face increases continuously in the direction from the cutting corner a transition range starting at a distance from the corner of one-fourth to one-third of the total length of the insert side.
References Cited (Backward Citations)
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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) | 1978-05-12 | 1978-11-11 | 1979-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-12 | 1982-11-11 | 1983-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-12 | 1986-11-11 | 1987-05-13 | $7700.00 | Window Closed / Lapsed |