US3755866A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Insert for cutting of steel, cast iron or similar material
Assignee: Santrade Ltd
•
Filing: 1971-05-17
•
Granted: 1973-09-04
•
Expires: 1991-05-17
Abstract
Abstract A metal-cutting insert comprises, in addition to a body portion of sintered hard metal, a thin coating of material having higher wear resistance than the body portion, said thin coating consisting essentially of two layers of fine-grained metal carbides disposed one on top of the other, the wear-resisting coating containing no binder metal.
Inventors
- 👤 F Ohlsson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:38
CPC Classifications
B; B23; B23B; B23B27/00; B23B27/14; B23B27/148; C; C23; C23C; C23C16/00; C23C16/22; C23C16/30; C23C16/32; C23C30/00; C23C30/005; Y; Y10; Y10T; Y10T407/00; Y10T407/27
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
18 words
Insert according to claim 1, wherein the coating covers at least the cutting edges and connecting chip faces.
Claim 2
Dependent Claim
30 words
Insert according to claim 1, wherein the two wear-resistant layers applied upon each other have a thickness of from 1 to 9 Mu m, and preferably between 1.5-6 Mu m.
Claim 3
Dependent Claim
28 words
Insert according to claim 3, in which each of the coating layers has a thickness not greater than 5 Mu m but not less than 1.5 Mu m.
Claim 4
Dependent Claim
27 words
Insert according to claim 3, wherein the two wear-resistant layers applied upon each other each have a thickness below 5 Mu m and exceeding 2 Mu m.
Claim 5
Dependent Claim
36 words
Insert according to claim 1, wherein the two wear-resistant layers applied over the other are separated by means of an extremely thin intermediate layer of a metal of the group consisting of Co, Ni and Fe.
Claim 6
Dependent Claim
20 words
Insert according to claim 6, wherein the thickness of the thin intermediate layer is between 0.2 and 2.0 Mu m.
Claim 7
Dependent Claim
76 words
Insert for cutting steel, cast iron and similar material, consisting of an insert body of sintered hard metal containing at least one carbide and binder metal, and on said body a very thin coating of higher wear-resistance than that of the hard metal in the insert body, said very thin coating consisting of two wear-reSistant layers disposed one over the other, the underlying layer consisting of titanium carbide and the outer layer consisting of tungsten carbide.
Claim 8
Dependent Claim
22 words
Insert as defined in claim 8, wherein the thickness of each of the underlying and outer layers is about 2.0 Mu m.
References Cited (Backward Citations)
US2053977A
Cited
US2414231A
Cited
US3482295A
Cited
US3308859A
Cited
US3564683A
Cited
US3616506A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-03 | 1977-03-05 | 1977-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-03 | 1981-03-05 | 1981-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-03 | 1985-03-05 | 1985-09-04 | $7700.00 | Window Closed / Lapsed |