EP0220964B1 - Schleifkörper aus kubischem Bornitrid - Google Patents

Schleifkörper aus kubischem Bornitrid Download PDF

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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
Application number
EP86308445A
Other languages
English (en)
French (fr)
Other versions
EP0220964A2 (de
EP0220964A3 (en
Inventor
Cornelius Phaal
John Dodsworth
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
De Beers Industrial Diamond Division Pty Ltd
Original Assignee
De Beers Industrial Diamond Division Pty Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by De Beers Industrial Diamond Division Pty Ltd filed Critical De Beers Industrial Diamond Division Pty Ltd
Priority to AT86308445T priority Critical patent/ATE67437T1/de
Publication of EP0220964A2 publication Critical patent/EP0220964A2/de
Publication of EP0220964A3 publication Critical patent/EP0220964A3/en
Application granted granted Critical
Publication of EP0220964B1 publication Critical patent/EP0220964B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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)

  1. Werkzeugeinsatz, umfassend einen Schleifcompact, der eine polykristalline Masse von kubischen Bornitrid-Teilchen umfaßt, die in einer Menge von wenigstens 70 Vol.-% vorhanden sind und in erheblichem Maße direkte Teilchen-zu-Teilchen-Bindung enthält, und eine durch die Masse aus kubischen Bornitrid-Teilchen dispergierte zweite Phase, wobei der Schleifcompact an jeder seiner gegenüberliegenden Seiten Hauptflächen aufweist, wobei die eine Hauptfläche eine Schneidkante für den Einsatz liefert, und die andere Hauptfläche eine Molybdän-Schicht mit einer Dicke von weniger als 0,5 mm an sich gebunden hat und damit in direktem Kontakt ist, wobei die größte lineare Ausdehnung des Compacts nicht größer als 10 mm ist.
  2. Werkzeugeinsatz nach Anspruch 1, wobei die zweite Phase Aluminiumnitrid und/oder Aluminiumdiborid enthält.
  3. Werkzeugeinsatz nach Anspruch 1 oder 2, wobei die zweite Phase Silicium in elementarer oder kombinierter Form enthält.
  4. Werkzeugeinsatz nach irgendeinem der vorstehenden Ansprüche, wobei die Dicke der Molybdän-Schicht im Bereich von 50 bis 150 µm (Mikron) liegt.
  5. Werkzeugeinsatz nach irgendeinem der vorstehenden Ansprüche, wobei der Compact eine dreieckige, rechteckige, pentagonale oder hexagonale Form hat.
  6. Werkzeugeinsatz nach irgendeinem der vorstehenden Ansprüche, wobei der Compact aus kubischem Bornitrid vermittels der Molybdän-Schicht und einem Lot auf einen Sintercarbid-Träger gelötet ist.
  7. Werkzeugeinsatz nach Anspruch 6, wobei das Lot eine Silber-Lötlegierung ist, die einen Schmelzpunkt zwischen 660°C und 840°C hat.
  8. Verfahren zum Schleifen eines Werkstücks bei leichten bis mittleren Schneideverwendungen, d.h., wobei der Vortrieb des Werkzeugeinsatzes 0,3 mm pro Umdrehung oder Schnitt des Einsatzes über das Werkstück nicht übersteigt, umfassend die Stufe, bei der das Werkstück mittels der Schleifkante eines Werkzeugeinsatzes gemäß irgendeinem der Ansprüche 1 bis 7 in einer schleifenden Weise in Kontakt gebracht wird.
  9. Verwendung eines Werkzeugeinsatzes nach irgendeinem der Ansprüche 1 bis 7 bei leichten bis mittleren Schneideververwendungen, d.h., wobei der Vortrieb des Werkzeugeinsatzes 0,3 mm pro Umdrehung oder Schnitt des Einsatzes über das Werkstück nicht übersteigt.
  10. Werkzeug, umfassend den Werkzeugeinsatz nach irgendeinem der Ansprüche 1 bis 7.
EP86308445A 1985-10-30 1986-10-29 Schleifkörper aus kubischem Bornitrid Expired - Lifetime EP0220964B1 (de)

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 (de) 1987-05-06
EP0220964A3 EP0220964A3 (en) 1987-12-02
EP0220964B1 true EP0220964B1 (de) 1991-09-18

Family

ID=25578135

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86308445A Expired - Lifetime EP0220964B1 (de) 1985-10-30 1986-10-29 Schleifkörper aus kubischem Bornitrid

Country Status (5)

Country Link
EP (1) EP0220964B1 (de)
JP (1) JPS62107007A (de)
AT (1) ATE67437T1 (de)
DE (1) DE3681553D1 (de)
ZA (1) ZA867605B (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
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
KR20100022072A (ko) 2007-05-22 2010-02-26 엘리먼트 씩스 리미티드 코팅된 ｃｂｎ

Citations (2)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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

Patent Citations (2)

* Cited by examiner, † Cited by third party
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
EP0220964A2 (de) 1987-05-06
JPS62107007A (ja) 1987-05-18
EP0220964A3 (en) 1987-12-02
DE3681553D1 (de) 1991-10-24
ZA867605B (en) 1987-06-24
ATE67437T1 (de) 1991-10-15

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