EP0204678B1 - Outil de coupe - Google Patents

Outil de coupe Download PDF

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Publication number
EP0204678B1
EP0204678B1 EP86850195A EP86850195A EP0204678B1 EP 0204678 B1 EP0204678 B1 EP 0204678B1 EP 86850195 A EP86850195 A EP 86850195A EP 86850195 A EP86850195 A EP 86850195A EP 0204678 B1 EP0204678 B1 EP 0204678B1
Authority
EP
European Patent Office
Prior art keywords
segments
leg
segment
cutting
attached
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
EP86850195A
Other languages
German (de)
English (en)
Other versions
EP0204678A1 (fr
Inventor
Stephan Ingvar Andersson
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.)
Diamant Boart Craelius AB
Original Assignee
Diamant Boart Craelius AB
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 Diamant Boart Craelius AB filed Critical Diamant Boart Craelius AB
Publication of EP0204678A1 publication Critical patent/EP0204678A1/fr
Application granted granted Critical
Publication of EP0204678B1 publication Critical patent/EP0204678B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • B24D5/123—Cut-off wheels having different cutting segments
    • 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

  • the present invention relates to a cutting tool which comprises a rotatable carrier element and a plurality of abrasive cutting segments attached thereto.
  • Cutting- devices which comprise circular cutting discs to which abrasive cutting segments are attached are known to the art.
  • One such cutting disc is retailed, for example, under the registered trademark TIGER.
  • Each cutting segment has the form of a substantially parallelepipedic body made from a mixture of metal and diamond powders.
  • the segment has two mutually opposing surfaces which are either curved or straight, and is brazed to the disc, namely to its periphery, through the intermediary of one of said surfaces.
  • the thickness of the segment as seen at right angles to the rotational direction of the disc, is slightly larger than the thickness of the disc, in or- derto prevent the disc from jamming or binding in the workpiece, and to avoid damaging the disc and/or said workpiece.
  • the height or vertical extension of the segment decreases to the same extent as its thickness, which often means that the segment cannot be utilized fully before it is necessary to replace the segment or to scrap the disc.
  • Cutting devices which comprise rotating tubular drill bits to which abrasive cutting segments are attached are also known in the art.
  • One such drill bit is retailed under the registered trademark PIXIE.
  • Each segment has the form of a slightly curved, U-shaped body incorporating, inter alia, synthetic diamonds.
  • the free legs of the U-shaped body and the web connecting said legs are brazed respectively to the tubular wall of the drill bit and to the peripheral side edge thereof.
  • AT-B-232 825 teaches a circular saw blade with a plurality of segments provided with teeth and attached to the blade.
  • the segments are tapered in the radial direction of the blade and designed to perform a cutting, chip removing operation and not an abrasive operation. Further, since the teeth of the segments are directed at an angle to the radius of the blade all segments must be mounted on the same side of the blade.
  • the US-A-3 261 384 teaches a circular saw blade with teeth for performing a cutting, chip removing operation.
  • the purpose of making the teeth as angle segments is to balance the shear forces. Special seatings on the saw body are required, which must withstand the large forces.
  • the leg 46 in Figs. 10-12 has the sole task of centering the cutting edges on the saw body, and do not participate in sawing. Due to its asymmetric shape the segment cannot be mounted on the saw body so that said leg comes into engagement with either side of the saw body.
  • the DE-C-356 554 teaches a circular saw blade for performing a cutting, chip removing operation with the aid of edges on segments which are attached in specially shaped grooves on the saw body. Two differently shaped segments must be used, if they are to be mounted on both sides of the saw body.
  • the SE-A-341 799 teaches a circular saw blade with segment teeth for cutting, chip removing operation.
  • Each segment is substantially U-shaped and comprises two or three parts, joined mutually and to the saw body by rivets.
  • the radially inward legs do not engage against the flat surface of the saw body (so as to be worn at approximately the same rate as the other legs); instead they are inserted in recesses at the periphery of the saw body.
  • the DE-B-2 333 246 teaches a side milling cutter with parallelepipedic cutting bits for chip removing operation, which are attached by clamping bodies in recesses in the milling cutter body.
  • the cutting device shown partially in Fig. 1, comprises a circular steel cutting disc, or so-called rondel 1, having a peripheral surface 2 broken by slots 3, so-called water slots, utilized to cool abrasive cutting elements 4 attached to the rondel between respective slots.
  • the cutting segments are moulded from a mixture of metal and diamond powders.
  • Each segment 4 has an angular cross-sectional shape and comprises two mutually perpendicular legs 5 and 6, which have a constant thickness along the whole of their lengths.
  • the upper and lower surfaces 9 and 7 of the illustrated leg 5 and the lower surface 8 of the illustrated leg 6 are slightly curved in the longitudinal direction, at least the radius of curvature of the surface 7 corresponding to a mean radius of curvature of the peripheral surfaces of those cutting discs, or rondels, to which the segments are to be fitted.
  • the remaining surfaces of the segments are preferably planar.
  • the thickness or width of the leg 5 is not critical and can be chosen to accomodate widely varying rondel thicknesses.
  • the segments 4 are attached to a rondel 1 which has a thickness smaller than the geometric extension a
  • the segments 4 are attached to a rondel 11 which has a thickness equal to or greater than the extension a.
  • the segments 4 are either brazed or glued to the rondels 1 and 11. Glueing is made possible by the fact that a relatively wide area of each segment is attached to respective rondels 1 and 11, namely the surface 7 of the leg 5, which seats on the peripheral surface 2 of the rondel, and a surface 16 which adjoins the surface 7 and extends at right angles thereto, said surface 16 being attached to the planar side surface of the rondel adjacent the peripheral surface 2.
  • the leg 6 of each alternate segment is placed against one side of the rondel and the leg 6 of each other segment against the opposite side thereof, as illustrated in Figs. 1 and 2.
  • one segment can be divided into two equal parts along the serrated line 15 in Fig. 3, so as to avoid possible problems with imbalance.
  • a notch 14 can be made centrally on the leg 6, so as to facilitate fracture of the segment along said line and to avoid damage to the segment during the fracturing process.
  • These segment halves are then placed adjacent one another with their legs on respectively sides of the rondel.
  • the side surface 12 of respective segments remote from the leg 6 will project radially outwardly from the rondel to a greater extent than the surfaces 13 adjacent the leg 6, and hence the workpiece will be cut, by abrasion, with the surfaces 12 when brought into abutment with the rondel.
  • the rondel has a width greater than that of the segments 4, as with the Fig. 2 embodiment, it is the side surfaces 13 adjacent respective legs 6 which protrude furthest from the rondel and which consequently engage the workpiece to be cut.
  • the extension a will decrease first by abrasion of the vertical cutting surface 12, shown in Fig. 3, down to the plane of the cutting surface 13, whereafter both surfaces 12, 13 are worn down to equal extents with a commensurate decrease in the extension a. If it is desired that wear on the vertical surface 13, or at least on the leg 6, is less rapid than that on the vertical surface 12, the leg 6 may have incorporated therein a material which has a greater resistance to wear than the material in the remainder of the segment 4.
  • the cutting surface is smaller with a broad segment according to the invention than with a corresponding conventional segment, which may result in enabling lower tool feed forces to be used.
  • the clearance is greater with the segment according to the invention, which reduces the risk of binding or jamming.
  • a larger clearance on the part of the conventional segment can only be obtained at the cost of a smaller attachment surface against the periphery of the rondel.
  • the clearance obtained with the segment according to the invention prevails until the segment is totally worn.
  • the segment according to the invention does not increase in volume with increasing cutting widths, which results in lower material costs than would otherwise be the case, and also means that less force is required for feeding the tool.
  • the brazing or glueing surface on the segment according to the invention is maximal in relation to the volume and weight of the segment, which is important since the segments are subjected to large centrifugal forces.
  • the 9% higher cost of the thinner segment according to the invention is justified by the beneficial clearance obtained, and is compensated for by the possibility of using a thinner rondel.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)

Claims (6)

1. Dispositif de découpage comportant un élément porteur rotatif et une pluralité de segments pour le découpage (4) formés d'une seule pièce et fixés audit élément porteur, chacun des segments ayant une forme de coupe transversale angulaire et étant pourvu d'une première avancée et d'une deuxième avancée perpendiculaire entre elles, la première avancée (5) étant fixée à la périphérie (2) de l'élément porteur (1; 11) et la deuxième avancée (6) étant située contre une surface de l'élément porteur près de ladite périphérie et étant fixée à cette surface, les axes longitudinaux des segments respectifs s'étendant dans la direction de la rotation effectuée par l'élément porteur, et tous les segments étant identiques, caractérisé en ce que les segments sont faits d'un matériau abrasif et ont une épaisseur constante, en ce que la deuxième avancée (6) de certains segments (4) est fixée à une surface d'élément porteur près de la périphérie (2) tandis que ladite deuxième avancée sur certains autres segments est fixée à l'autre des deux surfaces d'élément porteur se faisant face mutuellement près de la périphérie (2), de telle sorte que la deuxième avancée de tous les segments dans sa totalité forme saillie au-delà de la ligne de délimitation de l'élément porteur à angle droit avec la direction de rotation de celui-ci.
2. Dispositif de découpage selon la revendication 1, caractérisé en ce que l'épaisseur du segment (4) à angle droit avec la direction de rotation de l'élément porteur (1; 11) est inférieure à l'épaisseur de l'élément porteur.
3. Dispositif de découpage selon l'une des revendications précédentes, caractérisé en ce qu'il présente au moins un point de fragilisation (14) dans la deuxième avancée (6) du segment (4) ayant de préférence la forme d'une encoche située de façon centrale entre les deux extrémités de ladite avancée.
4. Dispositif de découpage selon l'une des revendications précédentes, caractérisé en ce qu'au moins une desdites deux avancées (5, 6) du segment (4) est fixée à l'élément porteur (1; 11) par collage ou par brasage.
5. Dispositif de découpage selon l'une des revendications précédentes, caractérisé en ce que l'élément porteur (1; 11) a la forme d'un disque de découpage circulaire.
6. Dispositif de découpage selon l'une des revendications 1 à 4, caractérisé en ce que l'élément porteur comprend une partie en forme de foret tubulaire.
EP86850195A 1985-06-05 1986-06-02 Outil de coupe Expired - Lifetime EP0204678B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8502779 1985-06-05
SE8502779A SE448151B (sv) 1985-06-05 1985-06-05 Skeranordning med utbytbara skersegment

Publications (2)

Publication Number Publication Date
EP0204678A1 EP0204678A1 (fr) 1986-12-10
EP0204678B1 true EP0204678B1 (fr) 1990-01-31

Family

ID=20360458

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86850195A Expired - Lifetime EP0204678B1 (fr) 1985-06-05 1986-06-02 Outil de coupe

Country Status (5)

Country Link
EP (1) EP0204678B1 (fr)
CA (1) CA1256293A (fr)
DE (1) DE3668573D1 (fr)
SE (1) SE448151B (fr)
ZA (1) ZA864056B (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105636747A (zh) * 2013-09-12 2016-06-01 罗德斯磨削工具两合公司 切割工具

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110842291A (zh) * 2018-08-21 2020-02-28 苏州宝时得电动工具有限公司 切割设备的切割片以及切割设备

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2811960A (en) * 1957-02-26 1957-11-05 Fessel Paul Abrasive cutting body
US3146561A (en) * 1961-05-01 1964-09-01 Frederick W Lindblad Circular saw and method of making the same
AT232825B (de) * 1961-11-06 1964-04-10 Ad Leimgruber & Cie A G Verfahren zur Herstellung eines Metallreissägeblattes
GB1060405A (en) * 1964-05-25 1967-03-01 Impregnated Diamond Prod Ltd Improvements in diamond impregnated tools
CH577365A5 (en) * 1973-08-22 1976-07-15 Swarovski Tyrolit Schleif High speed grinding disc - has zones of increased strength adjacent to and extending from hub bore
DE7836896U1 (de) * 1978-12-13 1979-03-29 Diamantwerkzeugfabrikation Tusch Kg, 5901 Wilnsdorf Trennscheibe
DE3220576A1 (de) * 1982-06-01 1983-12-01 BSB Biedron KG, 4630 Bochum Diamant-trennscheibe, insbesondere fuer natur- und kunststeinbearbeitung

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105636747A (zh) * 2013-09-12 2016-06-01 罗德斯磨削工具两合公司 切割工具
CN105636747B (zh) * 2013-09-12 2018-05-29 罗德斯磨削工具两合公司 切割工具

Also Published As

Publication number Publication date
ZA864056B (en) 1987-01-28
SE8502779D0 (sv) 1985-06-05
EP0204678A1 (fr) 1986-12-10
CA1256293A (fr) 1989-06-27
DE3668573D1 (de) 1990-03-08
SE8502779L (fr) 1986-12-06
SE448151B (sv) 1987-01-26

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