EP0714719A1
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EP
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Sintered body insert for cutting and method of manufacturing the same
Assignee: Sumitomo Electric Industries Ltd
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Filing: 1995-11-29
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Granted: —
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Expires: 2015-11-29
Abstract
Abstract A sintered body insert for cutting comprises an intermediate layer (24, 32) consisting of any material of cemented carbide, a ferrous metal and a high melting point metal, and a first layer (25a, 33a) and a second layer (25b, 33b), consisting of hard sintered bodies containing cubic boron nitride or diamond, which are arranged on positions holding the intermediate layer (24, 32) from above and from below respectively and bonded to the intermediate layer (24, 32) by sintering, and is so formed that its front and rear surfaces define cutting faces. All noses (R) and flanks concerning cutting are formed on the first layer (25a, 33a) and the second layer (25b, 33b), while the intermediate layer (24, 32) is formed to include the centers of gravity of the cutting faces as well as that of the overall insert. Further, coating layers consisting of a nitride of an element belonging to the group 4a, 5a or 6a of the periodic table etc. are formed on the surfaces of the cutting faces and the flanks. According to this structure, it is possible to provide a sintered body insert for cutting which is prolonged in life and excellent in economy such as the manufacturing cost.
Inventors
- 👤 Mitsuhiro c/o Itami Works Goto
- 👤 Satoru c/o Itami Works Kukino
- 👤 Kenichi c/o Itami Works Kikutani
- 👤 Tetsuo c/o Itami Works Nakai
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-06 12:23
CPC Classifications
B; B23; B23B; B23B27/00; B23B27/14; B23B27/141; B23B27/145; B23B2200/00; B23B2200/20; B23B2200/201; B23B2200/24; B23B2200/242; B23B2200/247; B23B2222/00; B23B2222/14; B23B2222/28; B23B2226/00; B23B2226/12; B23B2226/125; B23B2226/31; Y; Y10; Y10T; Y10T407/00; Y10T407/27; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/24967; Y10T428/24975; Y10T428/26; Y10T428/30; Y10T428/31504; Y10T428/31678
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
138 words
A sintered body insert for cutting, being a composite sintered body insert comprising: an intermediate layer consisting of a material being selected from a group consisting of cemented carbide, ferrous metals and high melting point metals; and first and second layers, consisting of hard sintered bodies containing cubic boron nitride or diamond, being arranged on positions so that the first and second layers hold said intermediate layer from above and from below respectively and bonded to said intermediate layer by sintering, said sintered body insert being so formed that its front and rear surfaces define cutting faces, all noses R and flanks concerning cutting being formed on said first and second layers, said intermediate layer being so formed as to include center of gravity portions of said cutting faces and the center of gravity of overall said insert.
Claim 2
Dependent Claim
76 words
The sintered body insert for cutting in accordance with claim 1, being provided along interfaces between said intermediate layer and said first and second layers with layers of at least one metal being selected from a group consisting of elements belonging to the groups 4a, 5a and 6a of the periodic table, or at least one compound selected from nitrides, carbides and oxides of at least one metal selected from said group and solid solutions thereof.
Claim 3
Dependent Claim
35 words
The sintered body insert for cutting in accordance with claim 1 or 2, wherein the vertical thickness of each of said first and second layers is at least 1.0 mm and less than 4.0 mm.
Claim 4
Dependent Claim
45 words
The sintered body insert for cutting in accordance with claim 1 or 2, wherein the thickness of said composite sintered body insert, i.e., the distance between said front and rear surfaces defining said cutting faces, is at least 1.5 mm and less than 5.0 mm.
Claim 5
Dependent Claim
92 words
The sintered body insert for cutting in accordance with any of claims 1 to 3, wherein coating layers consisting of at least one metal being selected from a group consisting of elements belonging to the groups 4a, 5a and 6a of the periodic table and Al, Si, B or at least one compound selected from nitrides, carbides and oxides of at least one metal being selected from said group and solid solutions thereof are formed on the surfaces of only said cutting faces or both of said cutting faces and said flanks.
Claim 6
Dependent Claim
22 words
The sintered body insert for cutting in accordance with claim 5, wherein each said coating layer consists of a (Ti, Al)N film.
Claim 7
Dependent Claim
61 words
The sintered body insert for cutting in accordance with claim 5, wherein each said coating layer consists of a superlattice multilayer compound film being formed by repeatedly stacking TiN and AlN layers to have a cubic X-ray diffraction pattern as a whole, the thickness of each of said stacked layers being at least 0.2 nm and not more than 20 nm.
Claim 8
Dependent Claim
68 words
The sintered body insert for cutting in accordance with claim 5, wherein each said coating layer consists of a superfine grain multilayer film having at least pairs of TiN and AlN layers each consisting of superfine grains of at least 1 nm and not more than 50 nm in grain size, the thickness of each said layer being at least 1 nm and not more than 60 nm.
Claim 9
Dependent Claim
35 words
The sintered body insert for cutting in accordance with claim 5, wherein each said coating layer consists of at least one compound being selected from nitrides, carbides and oxides of Ti and solid solutions thereof.
Claim 10
Dependent Claim
46 words
The sintered body insert for cutting in accordance with any of claims 6 to 9, wherein the surface of each said coating layer is coated with a single layer of Al₂O₃ or a multilayer film obtained by stacking at least pairs of Al₂O₃ and TiCN layers.
Claim 11
Dependent Claim
52 words
The sintered body insert for cutting in accordance with any of claims 6 to 9, wherein the surfaces of only those of said coating layers being formed on said cutting faces are coated with single layers of Al₂O₃ or multilayer films obtained by stacking at least pairs of Al₂O₃ and TiCN layers.
Claim 12
Dependent Claim
32 words
The sintered body insert for cutting in accordance with any of claims 6 to 8, wherein the outermost one of said stacked layers forming each said coating layer is a TiN layer.
Claim 13
Dependent Claim
57 words
The sintered body insert for cutting in accordance with any of claims 6 to 12, wherein the total film thickness of said coating layers is at least 0.1 µm and not more than 15 µm in portions forming said cutting faces, and at least 0.1 µm and not more than 10 µm in portions forming said flanks.
Claim 14
Independent Claim
192 words
A method of manufacturing a sintered body insert for cutting, comprising the steps of: forming a sandwich sintered body having upper and lower layers consisting of hard sintered bodies containing cubic boron nitride or diamond, and an intermediate layer, consisting of a material being selected from a group consisting of cemented carbide, ferrous metals and high melting point metals, being held between said upper and lower layers; performing electrodischarge machining on said sandwich sintered body and cutting the same along four planes being perpendicular to said upper and lower layers and to each other, thereby cutting out a composite sintered body insert in the form of a rectangular parallelopiped with said upper layer, said intermediate layer and said lower layer being aligned with each other in the vertical direction; and performing polishing or electrodischarge machining on said composite sintered body insert as being cut out for forming said sintered body insert for cutting so that all noses R and flanks concerning cutting are defined by said upper and lower layers and said intermediate layer includes center of gravity portions of said cutting faces and the center of gravity of overall said insert.
Claim 15
Dependent Claim
87 words
The method of manufacturing a sintered body insert for cutting in accordance with claim 14, further comprising a step of forming coating layers consisting of at least one metal being selected from a group consisting of elements belonging to the groups 4a, 5a and 6a of the periodic table, Al, Si and B or at least one compound being selected from nitrides, carbides and oxides of at least one element being selected from said group and solid solutions thereof by physical vapor deposition or chemical vapor deposition.
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