EP1074345A2 - Disque de coupage abrasif rotatif - Google Patents

Disque de coupage abrasif rotatif Download PDF

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Publication number
EP1074345A2
EP1074345A2 EP00306275A EP00306275A EP1074345A2 EP 1074345 A2 EP1074345 A2 EP 1074345A2 EP 00306275 A EP00306275 A EP 00306275A EP 00306275 A EP00306275 A EP 00306275A EP 1074345 A2 EP1074345 A2 EP 1074345A2
Authority
EP
European Patent Office
Prior art keywords
support member
cutting disc
periphery
disc
rotary cutting
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.)
Withdrawn
Application number
EP00306275A
Other languages
German (de)
English (en)
Other versions
EP1074345A3 (fr
Inventor
Mario c/o Marcrist Holdings Limited Halbeisen
Michael John William c/oMarcrist Hold. Ltd. Brown
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.)
Marcrist International Ltd
Original Assignee
Marcrist International 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 Marcrist International Ltd filed Critical Marcrist International Ltd
Publication of EP1074345A2 publication Critical patent/EP1074345A2/fr
Publication of EP1074345A3 publication Critical patent/EP1074345A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D18/00—Manufacture of grinding tools or other grinding devices, e.g. wheels, not otherwise provided for
    • B24D18/0009—Manufacture of grinding tools or other grinding devices, e.g. wheels, not otherwise provided for using moulds or presses
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D5/00—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting only by their periphery; Bushings or mountings therefor
    • B24D5/12—Cut-off wheels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28D—WORKING STONE OR STONE-LIKE MATERIALS
    • B28D1/00—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor
    • B28D1/02—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by sawing
    • B28D1/12—Saw-blades or saw-discs specially adapted for working stone
    • B28D1/121—Circular saw blades

Definitions

  • This invention relates to a rotary abrasive cutting disc and to a method of manufacturing such a disc.
  • Rotary abrasive cutting discs are conventionally manufactured in one of several ways.
  • individual segments of diamond-bearing material may be soldered or braised onto a supporting metal disc.
  • the segments may be welded onto the supporting disc by friction welding, argon arc welding or laser welding.
  • the carrier for the diamond or other abrasive particles is desirably of a relatively soft material, to allow for wearing of the carrier to expose fresh abrasive particles, in use, direct welding may not be possible, and it then becomes necessary to provide each segment with a layer of weldable material such as steel. The working life of such discs is good, but the cost of manufacture is high, since inadequate welding can dramatically reduce strength.
  • the abrasive particles can be applied to the supporting disc as a surface layer by electro-chemical deposition, but such discs are of lower durability, since the abrasive particles are only on the surface.
  • Another way of forming on the rim of the disc a body of material containing the abrasive particles is to compact a mixture of a powdered sinterable material and abrasive particles around the rim of the disc and then to sinter it to bond it to the disc.
  • the disc is suitably formed with tabs or keys on the periphery to increase the area of bonding of the sintered material to the disc.
  • the increased bonding area as compared with welding, coupled with the fact that bonding is even over the area of contact, ensures that a uniform bond of adequate strength is achieved.
  • a continuous cutting surface can be made by this method, if desired.
  • the shock resistance of the sintered material is poor, and it can be weakened by heating; if the sintering temperature is exceeded the material will soften and break up.
  • the invention provides a rotary cutting disc, comprising a metal support member, at least one body of a sintered powdered material containing abrasive particles formed on the periphery of the support member, and a weld formed along the junction between the or each body and the support member.
  • the invention also provides a method of making a rotary cutting disc, comprising forming a metal support member, shaping at least one compacted body of Powdered material containing abrasive particles so as to enclose at least a portion of the periphery of the support member, and heating the body or bodies to sinter the powdered material and bond the or each body to the periphery of the support member, and then locally applying heat to at least a portion of the external junction between the or each body and the support member to form a weld.
  • the abrasive particles are diamond
  • the sintered material is preferably a metal, for example copper or an alloy thereof, for example, bronze or brass.
  • the welding is suitably carried out by laser welding, and preferably the weld penetrates the support member, which is suitably in the general form of a disc, to a significant proportion of the thickness thereof, for example of the order of a quarter of the thickness.
  • the rim of the disc may be continuous or it may be segmented in the manner known for conventional cutting discs, with the shape of the slots between the segments being of any suitable form, for example as used in conventional cutting discs.
  • the cutting discs of the invention are at least comparable with conventional welded discs in terms of strength and durability, whilst being considerably less costly to manufacture. It is also possible to form a continuous body of material giving a performance equivalent to conventional welded discs, which is not heretofore been possible.
  • the sintered bond will constitute approximately 60% of the strength of the bond of the cutting edge to the disc, with the laser weld contributing the remainder. It is thus possible to use bronze materials for which laser welding would not, on its own, be considered sufficient.
  • a segmented cutting disc has a plurality of separate cutting segments 1 around its periphery, defined by shaped inwardly directed slots 2. While the slots may take any of a wide range of different shapes, the illustrated slots 2 each terminate in an offset circular aperture 3.
  • FIG. 1 represents just two segments on the periphery of a circular disc, and it will therefore be understood that a segmented cutting disc may have a large number of segments, for example sixteen for a 230mm diameter disc. However, the cutting disc may have a smaller number of segments, and these may be separated by narrow slots or by slots substantially equal in width to the segments.
  • the bodies 4 are formed by preparing a mixture of the abrasive particles and the softer material in powdered form, shaping the mixture around a peripheral part of each segment portion 1a, as may be seen from Figure 2, and then heating the body to sinter the powdered material together on the disc segment.
  • the disc segment has a tab or key 5 extending from the outermost edge thereof to increase the surface area for bonding of the sintered material, in conventional manner.
  • Laser welding is then carried out on opposed sides of the body 4 along the junction 6 between the lowermost edge of the body 4 and the segment portion 1a, to a depth which, for example, may be approximately equal to a third of the thickness of the disc support.
  • the disc 30 is not segmented but instead has a continuous body 31 of abrasive material and carrier formed on its periphery in the same manner as set out hereinbefore with reference to Figures 1 and 2.
  • a weld 32 is formed along the innermost edge of the body 31 on each side of the disc, using laser welding techniques conventional in the field of diamond cutting disc manufacture. This provides the strength advantages of welding not previously obtainable for a continuous cutting edge, for which welding would be impossible.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Mining & Mineral Resources (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
EP00306275A 1999-08-05 2000-07-24 Disque de coupage abrasif rotatif Withdrawn EP1074345A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9918357 1999-08-05
GB9918357A GB2353045A (en) 1999-08-05 1999-08-05 Rotary abrasive cutting disc

Publications (2)

Publication Number Publication Date
EP1074345A2 true EP1074345A2 (fr) 2001-02-07
EP1074345A3 EP1074345A3 (fr) 2002-10-16

Family

ID=10858551

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00306275A Withdrawn EP1074345A3 (fr) 1999-08-05 2000-07-24 Disque de coupage abrasif rotatif

Country Status (2)

Country Link
EP (1) EP1074345A3 (fr)
GB (1) GB2353045A (fr)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2616369A1 (fr) * 1987-06-10 1988-12-16 Technidiam Sa Tech Diamant Disque diamante pour la coupe de produits durs ou abrasifs
US5471970A (en) * 1994-03-16 1995-12-05 Diamant Boart, Inc. Method of manufacturing a segmented diamond blade
DE19653975A1 (de) * 1995-12-31 1997-10-30 Kimiko Sueta Trennscheibe
DE19712448C2 (de) * 1997-03-08 2000-07-27 Diamik Diamant Werkzeuge Gmbh Stammblatt für ein rotierendes Bearbeitungswerkzeug

Also Published As

Publication number Publication date
EP1074345A3 (fr) 2002-10-16
GB2353045A (en) 2001-02-14
GB9918357D0 (en) 1999-10-06

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