EP0355436A2 - Segments de scie contenant des particules fines de diamant ou de nitrure de bore cubique - Google Patents

Segments de scie contenant des particules fines de diamant ou de nitrure de bore cubique Download PDF

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Publication number
EP0355436A2
EP0355436A2 EP89113645A EP89113645A EP0355436A2 EP 0355436 A2 EP0355436 A2 EP 0355436A2 EP 89113645 A EP89113645 A EP 89113645A EP 89113645 A EP89113645 A EP 89113645A EP 0355436 A2 EP0355436 A2 EP 0355436A2
Authority
EP
European Patent Office
Prior art keywords
concentration
diamond
cutting
cutting elements
side sections
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.)
Ceased
Application number
EP89113645A
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German (de)
English (en)
Other versions
EP0355436A3 (fr
Inventor
Thomas Clark Clark
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.)
General Electric Co
Original Assignee
General Electric Co
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 General Electric Co filed Critical General Electric Co
Publication of EP0355436A2 publication Critical patent/EP0355436A2/fr
Publication of EP0355436A3 publication Critical patent/EP0355436A3/fr
Ceased legal-status Critical Current

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    • 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
    • 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

  • the present invention generally relates to circular saw blades of the kind used for sawing hard materials such as granite, marble, filled concrete and the like. More particularly, the present invention relates to diamond cutting segments containing fine particles of diamond or cubic boron nitride (CBN) at the segments edges so as to reduce blade deviation during the sawing process.
  • CBN cubic boron nitride
  • the blade of a saw of this type consists of a circular steel disc having a plurality of segments spaced around and brazed to the surface thereof.
  • Each saw segment consists of diamond abrasive bonded in a suitable alloy or metal matrix such as bronze or cobalt, for example.
  • the blade may deflect and vibrate laterally, i.e., substantially parallel to the axis of rotation. This causes the width of the cut to be larger than the width of the blade, with the result that the cutting efficiency of the blade is reduced. More importantly, deviations in cut direction may be caused. In addition, the rough surfaces on the workpiece must be ground flat and polished for many uses, such as decorative tiles. The lateral vibrations causing these drawbacks may he reduced by the use of wider saw blades or the use of stabilizing flanges. Wider saw blades have the disadvantage that more diamonds are required, whereas stabilizing flanges have the drawback that the depth of cut which can be achieved is limited.
  • sandwich segments generally comprise a center section having a lower concentration of diamonds as compared to the side sections.
  • sandwich segments employing a different size of cutting diamond in the center section than in the side sections.
  • Cutting segments manufactured in accordance with this disclosure comprise a conventional mixture of bonding metal and diamonds; however, a quantity of filler is added to the mixture. The filler will withstand the sintering process, but subsequently falls out so that pores are provided.
  • a segment is made with only the center porous, while the side sections are as dense as is conventional. The result is that the porous section can receive coolant for efficient cutting and the center sections wears faster to yield a concave cutting edge.
  • cutting segments for use on circular saw blades which contain an effective amount of abrasion resistant particles in the edges or side sections of said segments.
  • the cutting elements are diamonds and the concentration of such cutting diamonds is about the same in the center section of the saw blade segments as in the side sections.
  • the finer abrasion resistant particles added in the side sections of the segments cause the segments to wear non-­uniformly, thereby providing a concave wear surface which minimizes the ability of the saw blade to deviate from its cutting path.
  • the abrasion resistant particles are preferably small (i.e. less than about 80 mesh) diamond, cubic boron nitride or tungsten carbide particles.
  • novel saw blade segments comprising diamond cutting elements and small abrasion resistant diamond, CBN or tungsten carbide particles which cause the segments to wear non-uniformly.
  • FIG. 1 illustrates a preferred embodiment of a cutting segment for use on sow blades for cutting granite, marble, filled concrete and other hard materials.
  • the concentration of diamond cutting elements 1 in the center section 2 is preferably about the same as the concentration of diamond cutting elements 1 in the side sections or matrices 3. It should be appreciated, however, that a larger or smaller concentration of diamond cutting elements 1 can be employed in the center section 2 without departing from the spirit or intended scope of the invention. For example, it is expected that in some applications it may be desirable that the concentration of diamond cutting elements 1 in the center section 2 be greater than the concentration of diamond cutting elements 1 in the side sections 3.
  • a non-uniform cutting rate be achieved by including an effective amount of abrasion resistant particles 4 in side sections 3.
  • Saw blade segments manufactured with abrasion resistant particles 4 in side sections 3 will exhibit concave wear and will form a ridge on stone workpiece 5 as shown in FIG. 2. It is the presence of this ridge which minimizes the ability of the saw blade to deviate from its cutting path.
  • any suitable particles may be utilized as the abrasion resistant particles 4; however, it has been found that diamond, CBN and tungsten carbide particles are particularly effective.
  • the abrasion resistant particles 4 should be less than about 80 mesh.
  • the optimum mesh size for a particular application can be determined without undue experimentation.
  • the concentration of abrasion resistant particles can also vary depending upon the particular application, but a concentration of from about 0. 10 to about 0.35 carats per cubic centimeter has been found to be effective.
  • Diamond cutting elements 1 can be of one mesh size range, for example, 40/50 or 35/40, or a mixture or blend of mesh size ranges, such as 30/40 with 40/50.
  • a different mesh size can be used in the center section 2 than in the side sections 3.
  • either the center section 2 or the side sections 3 use one mesh size while the other uses a mixture of mesh sizes.
  • the proportion of one mesh size to a second or third mesh size in such a mixture of mesh sizes is not critical to the present invention.
  • the concentration of diamond cutting elements 1 can vary over a large range as can the proportion of cutting elements 1 in the center section 2 as compared to the side sections 3.
  • the concentration of diamond cutting elements 1 in the center section 2 ranges from about 0.6 carats per cubic centimeter to about 2.0 carats per cubic centimeter
  • the concentration of diamond cutting elements in the side sections 3 ranges from about 1.0 carats per cubic centimeter to about 2.0 carats per cubic centimeter.
  • the concentration of diamond cutting elements 1 is about the same in center section 2 and side sections 3.
  • FIG. 1 shows a sharp transition between center section 2 and side sections 3, it is possible to make such interface gradual with respect to either the cutting elements 1, the abrasion resistant particles 4, or both.
  • the width of center section 2 with respect to each side section 3 can vary over a wide range, but preferably is from about 1:2 to about 3:1.
  • FIG. 3 shows a less preferred alternate embodiment of the present invention wherein the abrasion resistant particles 4 are disposed in center section 2. With such arrangement, convex wearing of the segment's surface results and a valley forms in the stone workpiece 5, as illustrated in FIG. 4.
  • Diamond cutting elements 1 and abrasion resistant particles 4 are substantially uniformly dispersed throughout a conventional alloy or metal bonding matrix, for example, bronze, cobolt, cemented carbides or the like.
  • the matrix may be a material such as a ceramic or molded plastic.
  • the segment is made substantially the same as prior art segments, however, to a portion of the cement and diamond mixture is added a quantity of abrasion resistant particles.
  • abrasion resistant particles For course, in some embodiments it is necessary to prepare a conventional cement and diamond mixture as well as a second mixture having a lower concentration of diamond cutting elements 1 than is contained in the first mixture. To such second mixture is also added an effective amount of abrasion resistant particles.
  • cutting segments can be made by techniques well known to those skilled in the art.
  • a segment design which gave the desired improvement in reduction of deviation was prepared as follows: The sides were made using a concentration of 1 .20 carats per cubic centimeter of which 15 percent by weight was 170/200 mesh fine diamond as abrasion resistant particles and 85 percent by weight was 30/40 mesh diamond (MBS 750 available from General Electric Company) as cutting elements. The center was 0.75 carats per cubic centimeter of 30/40 mesh diamond (MBS 750 available from General Electric Company) as cutting elements.
  • the bond metal was extra fine mesh cobolt with 5 percent by weight tin added, and the segments were sintered at 830°C and 350 kg/cm2 for 15 minutes. Seventy segments were mounted on a rotary blade of 1000 mm diameter and used to cut various granites. The desired wear pattern developed quickly and persisted throughout the test. Blade deviation was significantly less than can be obtained with conventional saw blade segments.
EP19890113645 1988-08-25 1989-07-25 Segments de scie contenant des particules fines de diamant ou de nitrure de bore cubique Ceased EP0355436A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US23658088A 1988-08-25 1988-08-25
US236580 1988-08-25

Publications (2)

Publication Number Publication Date
EP0355436A2 true EP0355436A2 (fr) 1990-02-28
EP0355436A3 EP0355436A3 (fr) 1990-09-05

Family

ID=22890091

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890113645 Ceased EP0355436A3 (fr) 1988-08-25 1989-07-25 Segments de scie contenant des particules fines de diamant ou de nitrure de bore cubique

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EP (1) EP0355436A3 (fr)
JP (1) JPH0276681A (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0448314A2 (fr) * 1990-03-19 1991-09-25 De Beers Industrial Diamond Division (Proprietary) Limited Scie
EP0747168A2 (fr) * 1995-06-07 1996-12-11 Ronald Carlysle Wiand Procédé de fabrication d'un abrasif à base de diamant, avec distribution par zones
EP0763403A1 (fr) * 1995-09-13 1997-03-19 ERNST WINTER & SOHN Diamantwerkzeuge GmbH & Co. Outil de meulage et procédé et dispositif pour sa fabrication
CN105818278A (zh) * 2016-04-22 2016-08-03 姚添龙 一种高效节能的金刚石锯片和钨钢锯片

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3203774A (en) * 1959-05-08 1965-08-31 Vanguard Abrasive Corp Method of making an abrasive cut-off disk
DE1917957A1 (de) * 1969-04-09 1970-10-29 Pahlitzsch Dr Ing Gotthold Kreissaegeblatt mit gleichbleibender Unrundheit
DE1652480A1 (de) * 1967-11-03 1971-02-11 Willi Buettner Schneidwerkzeuge fuer Saegeblaetter zum Zersaegen von Steinbloecken
DE2318378A1 (de) * 1973-04-12 1974-09-19 Bronat Kg Georg Diamant-kreissaegeblatt zum schneiden von gestein
DE2438601A1 (de) * 1974-08-10 1976-02-26 Winter & Sohn Ernst Rotierendes trennwerkzeug
DE3204276A1 (de) * 1982-02-08 1983-08-18 J. König GmbH & Co Werkzeugfabrik, Steinindustrie- und Handwerkerbedarf, 7500 Karlsruhe Diamantbelag mit poroeser innenschicht fuer trennscheiben
EP0169081A2 (fr) * 1984-04-16 1986-01-22 Sii Megadiamond, Inc. Diamant composite polycristallin

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3203774A (en) * 1959-05-08 1965-08-31 Vanguard Abrasive Corp Method of making an abrasive cut-off disk
DE1652480A1 (de) * 1967-11-03 1971-02-11 Willi Buettner Schneidwerkzeuge fuer Saegeblaetter zum Zersaegen von Steinbloecken
DE1917957A1 (de) * 1969-04-09 1970-10-29 Pahlitzsch Dr Ing Gotthold Kreissaegeblatt mit gleichbleibender Unrundheit
DE2318378A1 (de) * 1973-04-12 1974-09-19 Bronat Kg Georg Diamant-kreissaegeblatt zum schneiden von gestein
DE2438601A1 (de) * 1974-08-10 1976-02-26 Winter & Sohn Ernst Rotierendes trennwerkzeug
DE3204276A1 (de) * 1982-02-08 1983-08-18 J. König GmbH & Co Werkzeugfabrik, Steinindustrie- und Handwerkerbedarf, 7500 Karlsruhe Diamantbelag mit poroeser innenschicht fuer trennscheiben
EP0169081A2 (fr) * 1984-04-16 1986-01-22 Sii Megadiamond, Inc. Diamant composite polycristallin

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0448314A2 (fr) * 1990-03-19 1991-09-25 De Beers Industrial Diamond Division (Proprietary) Limited Scie
EP0448314A3 (en) * 1990-03-19 1992-02-26 De Beers Industrial Diamond Division (Proprietary) Limited Saws
EP0747168A2 (fr) * 1995-06-07 1996-12-11 Ronald Carlysle Wiand Procédé de fabrication d'un abrasif à base de diamant, avec distribution par zones
EP0747168A3 (fr) * 1995-06-07 1997-10-08 Wiand Ronald C Procédé de fabrication d'un abrasif à base de diamant, avec distribution par zones
EP0763403A1 (fr) * 1995-09-13 1997-03-19 ERNST WINTER & SOHN Diamantwerkzeuge GmbH & Co. Outil de meulage et procédé et dispositif pour sa fabrication
CN105818278A (zh) * 2016-04-22 2016-08-03 姚添龙 一种高效节能的金刚石锯片和钨钢锯片

Also Published As

Publication number Publication date
EP0355436A3 (fr) 1990-09-05
JPH0276681A (ja) 1990-03-16

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