EP0354775B1 - Diamantwerkzeug - Google Patents

Diamantwerkzeug Download PDF

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Publication number
EP0354775B1
EP0354775B1 EP89308081A EP89308081A EP0354775B1 EP 0354775 B1 EP0354775 B1 EP 0354775B1 EP 89308081 A EP89308081 A EP 89308081A EP 89308081 A EP89308081 A EP 89308081A EP 0354775 B1 EP0354775 B1 EP 0354775B1
Authority
EP
European Patent Office
Prior art keywords
diamond
working surface
diamond particles
scaife
particles
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
EP89308081A
Other languages
English (en)
French (fr)
Other versions
EP0354775A2 (de
EP0354775A3 (de
Inventor
Robert Charles Burns
Gabriel Shraga Tolkowsky
Gerrit Jan Lucas Cronselaar
Cornelius Phaal
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
Publication of EP0354775A2 publication Critical patent/EP0354775A2/de
Publication of EP0354775A3 publication Critical patent/EP0354775A3/de
Application granted granted Critical
Publication of EP0354775B1 publication Critical patent/EP0354775B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B37/00—Lapping machines or devices; Accessories
    • B24B37/04—Lapping machines or devices; Accessories designed for working plane surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B9/00—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor
    • B24B9/02—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground
    • B24B9/06—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain
    • B24B9/16—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain of diamonds; of jewels or the like; Diamond grinders' dops; Dop holders or tongs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D7/00—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting otherwise than only by their periphery, e.g. by the front face; Bushings or mountings therefor
    • B24D7/02—Wheels in one piece

Definitions

  • This invention relates to diamond scaifes.
  • a diamond scaife is a tool which comprises a cast iron plate, one surface of which has a paste containing a plurality of small diamond particles uniformly spread across it. The paste is rubbed on to the surface and then worked in with a piece of low quality diamond.
  • a diamond scaife is a tool used for polishing diamond.
  • US-A-2 863 750 discloses a method of mechanically setting diamond particles in, and renewing the solid working surface of, a metal diamond-abrasive wheel, consisting essentially of the steps: applying a mixture comprising diamond particles, glass particles of larger size than said diamond particles and a carrier selected from the group consisting of petroleum jelly and a heavy grease, to the working surface of said wheel; rotating said wheel at a speed in excess of about 300 rpm; urging a freely rotatable roller against said working surface while said wheel is rotating under a pressure sufficient to cause said glass particles to cut said working surface of said wheel and to loosen previously set diamond particles in said working surface; and thereafter urging said roller against said working surface while the wheel is rotating under a pressure sufficient to crush said glass particles to a size smaller than said diamond particles and to force said diamond particles into the interstices of said working surface.
  • the present invention provides a diamond scaife comprising an iron-based working surface having a bonding paste of an organic binder uniformly spread across it, the paste containing a plurality of particles of single crystal and polycrystalline diamond which are partially embedded in the iron-based working surface.
  • a method of making a diamond scaife as described above which includes the steps of providing an iron-based working surface, depositing a layer of a bonding paste of an organic binder on the surface, the bonding paste containing a plurality of single crystal and polycrystalline diamond particles, and causing the diamond particles to become partially embedded in the working surface.
  • the abrasive elements for the diamond scaife will be constituted by a mixture of single crystal and polycrystalline diamond.
  • the paste will constitute a thin film across the iron-based working surface and is believed, in use, to perform some lubricating function.
  • the paste will contain the diamond particles which will also be partially embedded in the iron-based working surface. It has been found that use of this scaife results in polishing being achieved without the metal surface coming into contact with the diamond or other material being polished.
  • the working surface may be made of any suitable iron-based material, but is preferably cast iron.
  • the paste will have a coherency sufficient to allow it to remain on the working surface without flowing off it. It will act, at least in part, to locate the diamond particles on the working surface and also as a lubricant.
  • the paste is constituted by an organic binder which may be any known in the art. Examples of suitable binders include cellulose ethers and esters, phenolic resins, dextrin and other similar materials. One preferred organic binder is methyl cellulose.
  • the diamond particles will be fine, i.e. they will generally have a particle size of 40 microns or less. When the diamond scaife is to be used for a relatively rough polishing operation, the diamond particles will typically have a size of 10 to 40 microns. For smoothing operations, finer diamond particles of the order of 2 to 10 microns will be used.
  • the diamond particles will be made up of a combination of single crystal diamond and polycrystalline diamond.
  • the polycrystalline diamond particles will generally be produced by crushing a diamond compact.
  • the diamond compact may be one which contains a solvent second phase such as that described in United States Patent No. 3,745,623 and British Patent No. 1,489,130.
  • the polycrystalline diamond may also be produced from a thermally stable diamond compact, that is a diamond compact which can withstand a temperature of 1200°C in a vacuum, inert or non-oxidising atmosphere without any significant graphitisation of the diamond occurring. Examples of such compacts are described in United States Patents Nos. 4,224,380, 4,534,773 and British Patent No. 2,158,086. It is preferred that the polycrystalline diamond is thermally stable, particularly of the type described in British Patent No. 2,158,086.
  • the diamond scaife may be made by a method which forms another aspect of the invention. As described above, this method involves providing an iron-based working surface, depositing a layer of a bonding paste of an organic binder on the surface, the bonding paste containing a plurality of single crystal and polycrystalline diamond particles, and causing the diamond particles to become partially embedded in the working surface. Generally, the diamond particles will be caused to become partially embedded in the working surface by rotating that surface and bringing the rotating surface into contact with a diamond surface which is generally a piece of low quality diamond.
  • the bonding paste will preferably be deposited on the working surface in the form of a liquid which contains a solvent and the solvent then allowed to evaporate at least partially, to produce the coherent paste.
  • the solvent will vary according to the nature of the organic binder.
  • the organic binder will be such that the solvent is water.
  • the single crystal diamond particles may be smaller than the polycrystalline diamond particles so that when the particles are caused to become partially embedded in the working surface, the fine single crystal diamond particles tend to locate in spaces between the polycrystalline diamond particles.
  • FIG. 1 of this drawing there is shown a cast-iron disc 10 of a diamond scaife which has an upper working surface 12.
  • This working surface 12 has a uniform layer of bonding paste of an organic binder uniformly spread across it.
  • This bonding paste includes a plurality of diamond particles 14 evenly distributed through it and partially embedded in the working surface 12 of the disc 10.
  • the diamond scaife may be made by depositing a first layer 16 on the working surface 12 of the disc 10 - see Figure 2.
  • This layer 16 will consist of an organic binder containing a plurality of the polycrystalline diamond particles.
  • the layers 16 and 18 are each deposited by providing a liquid mixture of the organic binder, a suitable solvent and the diamond particles, applying that liquid mixture to the relevant surface and allowing the solvent to evaporate leaving a coherent paste layer.
  • the diamonds of the two layers are worked into the surface 12 by rotating the disc 10, for example at a speed of about 2000rpm, and bringing that rotating surface into contact with a diamond surface such as that provided by a low quality diamond.
  • the resulting product is that illustrated by Figure 1.
  • one carat of crushed thermally stable diamond compact containing a silicon second phase (as described in British Patent No. 2,158,086) and of particle size less than 40 microns was rubbed on the cast iron working surface of a scaife with a binder such as dextrin or phenolic resin in a solvent.
  • the solvent was allowed to evaporate leaving a coherent paste.
  • a paste of fine single crystal diamond particles in water containing methyl cellulose was then applied to the coated surface.
  • the water was allowed to evaporate leaving a thin film or layer of coherent methyl cellulose paste containing the diamond particles.
  • the coated working surface was then rotated at a speed of 2000rpm and brought into contact with a low quality diamond.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Cutting Tools, Boring Holders, And Turrets (AREA)
  • Carbon And Carbon Compounds (AREA)

Claims (10)

  1. Diamantpolierwerkzeug mit einer auf Eisen basierenden Arbeitsoberfläche (12), über welche eine Haft- bzw. Bindepaste aus einem organischen Bindemittel gleichförmig verteilt ist, wobei die Paste eine Vielzahl von Partikeln (14) aus Einkristall- und polykristallinen Diamanten enthält, welche in die auf Eisen basierende Arbeitsoberfläche (12) teilweise eingebettet sind.
  2. Diamantpolierwerkzeug gemäß Anspruch 1, wobei das organische Bindemittel aus phenolischen Harzen, Zelluloseethern und -estern und Mischungen hiervon ausgewählt ist.
  3. Diamantpolierwerkzeug gemäß Anspruch 1 oder 2, wobei die Arbeitsoberfläche (12) eine gußeiserne Arbeitsoberfläche ist.
  4. Diamantpolierwerkzeug gemäß einem der vorhergehenden Ansprüche, wobei die polykristallinen Diamantpartikel (14) thermisch stabile polykristalline Diamantpartikel sind.
  5. Diamantpolierwerkzeug gemäß einem der vorhergehenden Ansprüche, wobei die Diamantpartikel (14) eine Größe von 40 µm oder weniger aufweisen.
  6. Verfahren zum Herstellen eines Diamantpolierwerkzeuges gemäß einem der vorhergehenden Ansprüche, mit den Schritten, eine auf Eisen basierende Arbeitsoberfläche (12) vorzusehen, eine Schicht aus einer Haft- bzw. Bindepaste aus einem organischen Bindemittel auf der Oberfläche abzuscheiden, wobei die Bindepaste eine Vielzahl von Einkristall- und polykristallinen Diamantpartikeln (14) enthält, und zu veranlassen, daß die Diamantpartikel in die Arbeitsoberfläche (12) teilweise eingebettet werden.
  7. Verfahren gemäß Anspruch 6, wobei die Bindepaste in der Form einer Flüssigkeit mit einem Lösungsmittel abgeschieden wird und wobei man das Lösungsmittel zumindest teilweise evaporieren läßt, um die Paste zu erzeugen.
  8. Verfahren gemäß Anspruch 7, wobei das Lösungsmittel Wasser ist.
  9. Verfahren gemäß Anspruch 7 oder Anspruch 8, wobei zwei Schichten von Bindepaste auf die Fläche (12) aufgebracht werden, und zwar eine über der anderen, wobei die Schicht (16) benachbart der Arbeitsoberfläche die polykristallinen Diamantpartikel enthält und die andere Schicht (18) die Einkristall-Diamantpartikel enthält.
  10. Verfahren gemäß einem der Ansprüche 6 bis 9, wobei veranlaßt wird, daß die Diamantpartikel in die Arbeitsoberfläche (12) teilweise eingebettet werden, indem jene Fläche (12) in Drehung versetzt wird und die sich drehende Fläche (12) in Kontakt mit einer Diamantoberfläche gebracht wird.
EP89308081A 1988-08-10 1989-08-09 Diamantwerkzeug Expired - Lifetime EP0354775B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ZA885879 1988-08-10
ZA885879 1988-08-10

Publications (3)

Publication Number Publication Date
EP0354775A2 EP0354775A2 (de) 1990-02-14
EP0354775A3 EP0354775A3 (de) 1991-03-27
EP0354775B1 true EP0354775B1 (de) 1994-04-27

Family

ID=25579366

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89308081A Expired - Lifetime EP0354775B1 (de) 1988-08-10 1989-08-09 Diamantwerkzeug

Country Status (2)

Country Link
EP (1) EP0354775B1 (de)
IL (1) IL91187A0 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IL101936A (en) * 1991-05-23 1994-11-11 De Beers Ind Diamond Wheel for cutting or polishing diamonds
BE1017837A3 (nl) * 2007-11-05 2009-08-04 Wetenschappelijk En Tech Onder Werkwijze en inrichting voor het mechanisch bewerken van diamant.
CN102676911B (zh) * 2012-05-25 2013-11-13 广州柴油机厂股份有限公司 一种耐磨铸铁盘及其生产工艺

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR993724A (fr) * 1948-08-27 1951-11-06 Perfectionnements à la fabrication des polissoirs abrasifs
US2863750A (en) * 1954-10-18 1958-12-09 Sheldon M Booth Method, composition and apparatus for mechanically setting or resetting diamond particles in a working surface
GB1161885A (en) * 1965-12-30 1969-08-20 Paul Michael Troll Improvements in relating to Abrasives.
BE775418A (nl) * 1971-11-17 1972-03-16 Caes Henri Werkwijze voor het vasthouden van diamantpoeder op slijpschijven.
PL121916B1 (en) * 1979-08-25 1982-06-30 Przemyslu Narzedziowego Vis K Method of manufacturing abrasive tools with a metallic galvanic bindereskim gal'vanicheskim vjazhuhhim
SU878551A1 (ru) * 1980-03-10 1981-11-07 Львовское Производственное Объединение По Выпуску Искусственных Алмазов И Алмазного Инструмента Металлическа св зка дл изготовлени алмазного инструмента
DE8509236U1 (de) * 1984-03-30 1985-09-19 De Beers Industrial Diamond Division (Proprietary) Ltd., Johannesburg, Transvaal Schleifwerkzeug mit Schleifeinsatz

Also Published As

Publication number Publication date
IL91187A0 (en) 1990-03-19
EP0354775A2 (de) 1990-02-14
EP0354775A3 (de) 1991-03-27

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