EP0220964B1 - Outil abrasif en nitrure de bore cubique - Google Patents
Outil abrasif en nitrure de bore cubique Download PDFInfo
- Publication number
- EP0220964B1 EP0220964B1 EP86308445A EP86308445A EP0220964B1 EP 0220964 B1 EP0220964 B1 EP 0220964B1 EP 86308445 A EP86308445 A EP 86308445A EP 86308445 A EP86308445 A EP 86308445A EP 0220964 B1 EP0220964 B1 EP 0220964B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- tool insert
- compact
- boron nitride
- cubic boron
- insert according
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D3/00—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents
- B24D3/02—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent
- B24D3/04—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent and being essentially inorganic
- B24D3/14—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent and being essentially inorganic ceramic, i.e. vitrified bondings
- B24D3/16—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent and being essentially inorganic ceramic, i.e. vitrified bondings for close-grained structure, i.e. of high density
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D3/00—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents
- B24D3/007—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent between different parts of an abrasive tool
Definitions
- This invention relates to cubic boron nitride abrasive bodies.
- Cubic boron nitride abrasive compacts are known in the art (e.g. EP-A1-0 101 259) and consist of a polycrystalline mass of cubic boron nitride particles present in an amount of at least 70 percent by volume bonded into a hard conglomerate. Such compacts may contain a second phase. When provided, the second phase is typically a ceramic phase. The second phase acts to some extent as a binder phase for the cubic boron nitride particles.
- One of the most successful cubic boron nitride abrasive compacts presently on the market is one wherein the second phase consists essentially of aluminium nitride and/or aluminium diboride.
- This compact is sold in the form of large discs which are clamped into a suitable tool holder and used in this manner for abrading various work pieces. A curved edge of the compact is used as the abrading edge.
- This compact is designed for applications where a high removal rate of workpiece is desired.
- Abrasive compacts comprising diamond or cBN abrasive particles or a mixture thereof, present in an amount of at least 50 volume percent, bonded into a hard conglomerate by means of a metal are known from US-A-4 063 909. According to this document the compacts are bonded to a support by a layer of high temperature braze with a thickness of less than 0.5 mm.
- Suitable high temperature braze metals include Ti, Ni, Co, Fe, Cr, Mn, V, Mo, Ta or Pt or an alloy containing one or more thereof, Ti or Ti-alloys are particularly preferred.
- a tool insert comprising an abrasive compact comprising a polycrystalline mass of cubic boron nitride particles present in an amount of at least 70 percent by volume and containing substantial direct particle-to-particle bonding and a second phase dispersed through the cubic boron nitride particle mass, the abrasive compact presenting major surfaces on each of opposite sides thereof, the one major surface providing a cutting point for the insert and the other major surface having bonded thereto, and being in direct contact with, a layer of molybdenum of thickness less than 0,5mm, the largest linear dimension of the compact being no more than 10mm.
- the tool insert of the invention is thus a small cubic boron nitride compact which has a molybdenum layer bonded to one major flat surface thereof. Because of its size, it is not practical to hold the insert mechanically in a suitable tool holder. However, the presence of the molybdenum layer renders the compact brazeable to a tool holder. It is preferable that the compact is first brazed to a cemented carbide support which is then brazed to the tool holder or mechanically held in a tool holder. Cemented carbide has a similar coefficient of thermal expansion to the compact and problems arising due to differences in thermal expansion of the compact and support are minimised.
- the abrasive compact of the insert preferably has a rectangular, triangular, pentagonal or hexagonal shape.
- the compact presents several points and it is these points which provide cutting points for the insert.
- the molybdenum layer is the thin layer, preferably having a thickness in the range 50 to 150 ⁇ m (microns).
- the layer of molybdenum may have an outer nickel or like metal layer applied to it, that is to say, the layer of molybdenum is in direct contact with the abrasive compact and is between the abrasive compact and the nickel or like metal layer.
- the cubic boron nitride compact may be any known in the art but is preferably one wherein the second phase contains aluminium nitride and/or aluminium diboride. Second phases of this nature are produced when aluminium is present during manufacture of the compact.
- One particularly preferred cubic boron nitride of this nature has a second phase which consists essentially of aluminium nitride and/or aluminium diboride.
- the second phase may also contain other components such as silicon which is either in elemental or combined form.
- the tool inserts of the invention may be used for a wide variety of applications. They have particular application for light to medium turning, boring, grooving, threading and milling of various steels, irons and alloys such as: Ni-HARD white irons having a hardness of 55 to 58 HRC High chromium irons having a hardness of 55 to 62 HRC Cold work tool steels having a hardness of 60 HRC High speed steels having a hardness of 62 HRC Grey cast irons (pearlitic) having a hardness of 220 HB Sintered irons having a hardness of 100 HB Cobalt-based hard facing alloys Nickel-based hard facing alloys Meehanite white irons having a hardness of 55 HRC
- cubic boron nitride abrasive compact will be brazed to a cemented carbide support, preferably a cemented tungsten carbide support, by means of the readily brazeable molybdenum layer and using a braze such as a silver brazing alloy having a melting point between 660°C and 840°C.
- a braze such as a silver brazing alloy having a melting point between 660°C and 840°C.
- the tool insert is particularly useful for light to medium cut applications. This means that the infeed of the tool insert during turning, boring, grooving or milling will not exceed 0,3mm per revolution or pass of the insert across the workpiece.
- a mass of cubic boron nitride particles was placed in contact with an aluminium foil which itself was placed in contact with a foil of molybdenum.
- This unbonded assembly was placed in the reaction zone of a conventional high temperature/high pressure apparatus and subjected to a temperature of about 1500°C and a pressure of about 5.5Gpa (55 kilobars) for a period of 15 minutes.
- Recovered from the reaction zone using conventional techniques was an abrasive compact containing about 90 percent by volume of cubic boron nitride particles in which there was substantial direct particle-to-particle bonding and a second phase consisting essentially of aluminium nitride and/or aluminium diboride.
- the compact was produced in the form of a disc and had bonded to a major flat surface thereof a layer of molybdenum of thickness about 100 ⁇ m (microns).
- This compact was cut into a plurality of equilateral triangles, some having a side dimension of 5mm and others having a side dimension of 7mm.
- Each triangle constituted a tool insert of the invention.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Ceramic Engineering (AREA)
- Inorganic Chemistry (AREA)
- Polishing Bodies And Polishing Tools (AREA)
- Ceramic Products (AREA)
- Cutting Tools, Boring Holders, And Turrets (AREA)
- Powder Metallurgy (AREA)
Claims (10)
- Insert d'outil comprenant un corps compact abrasif constitué par une masse polycristalline de particules de nitrure de bore cubique présentes dans une quantité d'au moins 70 % en volume et contenant une liaison importante directe de particule à particule et une seconde phase dispersée dans la masse de particules de nitrure de bore cubique, le corps compact abrasif présentant des surfaces principales sur chacun de ses côtés opposés, la surface principale fournissant un point de coupe pour l'insert et l'autre surface principale comportant une couche de molybdène d'une épaisseur inférieure à 0,5 mm liée sur celle-ci, et étant en contact direct, la plus grande dimension linéaire du corps compact n'étant pas supérieure à 10mm.
- Insert d'outil selon la revendication 1, dans lequel la seconde phase contient du nitrure d'aluminium et/ou du diborure d'aluminium.
- Insert d'outil selon la revendication 1 ou 2, dans lequel la seconde phase contient du silicium sous la forme élémentaire ou combinée.
- Insert d'outil selon l'une quelconque des revendications précédentes dans lequel l'épaisseur de molybdène se situe dans la plage de 50 à 150 microns.
- Insert d'outil selon l'une quelconque des revendications précédentes dans lequel le corps compact présente une forme triangulaire, rectangulaire, pentagonale ou hexagonale.
- Insert d'outil selon l'une quelconque des revendications précédentes dans lequel le corps compact en nitrure de bore cubique est brasé sur un support en carbure cémenté au moyen de la couche de molybdène et d'une brasure.
- Insert d'outil selon la revendication 6, dans lequel la brasure est un alliage de brasure en argent ayant un point de fusion situé entre 660°C et 840°C.
- Procédé pour l'abrasion d'une pièce à usiner dans une application de coupe légère à moyenne, c'est-à-dire dans lequel l'avance de l'insert d'outil ne dépasse 0,3 mm par tour ou passe de l'insert sur la pièce à usiner, comprenant l'étape consistant à mettre la pièce à usiner en contact d'une manière abrasive par le point de coupe d'un insert d'outil selon l'une quelconque des revendications 1 à 7.
- Utilisation d'un insert d'outil selon l'une quelconque des revendications 1 à 7 dans une application de coupe légère à moyenne, c'est-à-dire dans laquelle l'avance de l'insert de l'outil ne dépasse pas 0,3 mm par tour ou passe de l'insert sur la pièce à usiner.
- Outil comprenant l'insert d'outil selon l'une quelconque des revendications 1 à 7.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT86308445T ATE67437T1 (de) | 1985-10-30 | 1986-10-29 | Schleifkoerper aus kubischem bornitrid. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ZA858339 | 1985-10-30 | ||
ZA858339 | 1985-10-30 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0220964A2 EP0220964A2 (fr) | 1987-05-06 |
EP0220964A3 EP0220964A3 (en) | 1987-12-02 |
EP0220964B1 true EP0220964B1 (fr) | 1991-09-18 |
Family
ID=25578135
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP86308445A Expired - Lifetime EP0220964B1 (fr) | 1985-10-30 | 1986-10-29 | Outil abrasif en nitrure de bore cubique |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0220964B1 (fr) |
JP (1) | JPS62107007A (fr) |
AT (1) | ATE67437T1 (fr) |
DE (1) | DE3681553D1 (fr) |
ZA (1) | ZA867605B (fr) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2601284B2 (ja) * | 1987-09-01 | 1997-04-16 | 株式会社石塚研究所 | 焼結ダイヤモンド複合体、及びその製造方法 |
FR2620362B1 (fr) * | 1987-09-11 | 1993-05-21 | Combustible Nucleaire | Grains abrasifs thermostables non poreux destines aux travaux de sciage et elements de coupe comportant ces grains |
US5626909A (en) * | 1994-12-07 | 1997-05-06 | General Electric Company | Fabrication of brazable in air tool inserts |
EP2155832A1 (fr) | 2007-05-22 | 2010-02-24 | Element Six Limited | Cbn enduit |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3743489A (en) * | 1971-07-01 | 1973-07-03 | Gen Electric | Abrasive bodies of finely-divided cubic boron nitride crystals |
US3944398A (en) * | 1974-04-30 | 1976-03-16 | Frank Rutherford Bell | Method of forming an abrasive compact of cubic boron nitride |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5844635B2 (ja) * | 1974-08-02 | 1983-10-04 | インスチテユ−ト プロブレム マテリアロヴエデニア アカデミイ ナウク ウクラインスコイ エエスア−ル | 金属と超硬質人造材料とをろう接する方法およびそのためのろう接剤 |
IE42084B1 (en) * | 1974-09-18 | 1980-06-04 | De Beers Ind Diamond | Abrasive bodies |
IL59519A (en) * | 1979-03-19 | 1982-01-31 | De Beers Ind Diamond | Abrasive compacts |
US4401443A (en) * | 1981-10-26 | 1983-08-30 | General Electric Company | Polycrystalline silicon-bonded cubic boron nitride body and method |
US4522633A (en) * | 1982-08-05 | 1985-06-11 | Dyer Henry B | Abrasive bodies |
JPS60263602A (ja) * | 1984-06-11 | 1985-12-27 | Sumitomo Electric Ind Ltd | 複合焼結体工具 |
-
1986
- 1986-10-06 ZA ZA867605A patent/ZA867605B/xx unknown
- 1986-10-29 AT AT86308445T patent/ATE67437T1/de not_active IP Right Cessation
- 1986-10-29 DE DE8686308445T patent/DE3681553D1/de not_active Expired - Lifetime
- 1986-10-29 EP EP86308445A patent/EP0220964B1/fr not_active Expired - Lifetime
- 1986-10-30 JP JP61257113A patent/JPS62107007A/ja active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3743489A (en) * | 1971-07-01 | 1973-07-03 | Gen Electric | Abrasive bodies of finely-divided cubic boron nitride crystals |
US3944398A (en) * | 1974-04-30 | 1976-03-16 | Frank Rutherford Bell | Method of forming an abrasive compact of cubic boron nitride |
Also Published As
Publication number | Publication date |
---|---|
EP0220964A3 (en) | 1987-12-02 |
ATE67437T1 (de) | 1991-10-15 |
DE3681553D1 (de) | 1991-10-24 |
JPS62107007A (ja) | 1987-05-18 |
EP0220964A2 (fr) | 1987-05-06 |
ZA867605B (en) | 1987-06-24 |
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