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WO1997037774A1 - Procede de revetement d'une lame de coupe presentant des caracteristiques ameliorees de resistance a l'usure - Google Patents

Procede de revetement d'une lame de coupe presentant des caracteristiques ameliorees de resistance a l'usure Download PDF

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Publication number
WO1997037774A1
WO1997037774A1 PCT/US1997/005288 US9705288W WO9737774A1 WO 1997037774 A1 WO1997037774 A1 WO 1997037774A1 US 9705288 W US9705288 W US 9705288W WO 9737774 A1 WO9737774 A1 WO 9737774A1
Authority
WO
WIPO (PCT)
Prior art keywords
blade
coating
thickness
coating material
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.)
Ceased
Application number
PCT/US1997/005288
Other languages
English (en)
Inventor
Metin Sakarcan
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 Inc
Original Assignee
Diamant Boart Inc
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 Inc filed Critical Diamant Boart Inc
Priority to AU26001/97A priority Critical patent/AU2600197A/en
Publication of WO1997037774A1 publication Critical patent/WO1997037774A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
    • C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
    • C23C4/10—Oxides, borides, carbides, nitrides or silicides; Mixtures thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
    • B23D61/00—Tools for sawing machines or sawing devices; Clamping devices for these tools
    • B23D61/02—Circular saw blades
    • B23D61/025—Details of saw blade body
    • B23D61/026—Composite body, e.g. laminated
    • 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
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C30/00—Coating with metallic material characterised only by the composition of the metallic material, i.e. not characterised by the coating process
    • C23C30/005—Coating with metallic material characterised only by the composition of the metallic material, i.e. not characterised by the coating process on hard metal substrates

Definitions

  • the present invention relates to a diamond cutting blade of the type having a central disc-shaped body and cutting segments located about the periphery of the body. More specifically, the invention relates to a cutting blade having a tungsten carbide coating covering a portion of the outer surfaces of the blade, and a method of forming this coating on the blade.
  • Diamond cutting blades are often utilized for cutting or sawing concrete, brick, and other abrasive materials. These cutting blades comprise a central disc-shaped body or cone having one or more cutting segments located on the peripheral edge of the body (See Figure 1) .
  • the body of the blade is typically constructed from a material much less durable than the cutting segment, such as carbon-steel or similar material.
  • the body is thin, has a circular outer shape, and a central mounting hole.
  • the cutting segment comprises diamond chips or a similar abrasive, durable material positioned in matrix form in a softer material.
  • the cutting segment may be a single ring extending completely around the outer edge of the body, or individual segments spaced apart about the edge of the body. When multiple individual segments are employed, they are normally located between gullets or cut-outs in the body of the blade. Each cutting segment is attached to the peripheral edge of the body by welding, brazing or the like.
  • the blade In use, the blade is mounted on a drive and rotated with respect to an axis extending perpendicular to the radial direction of the blade.
  • the cutting segment(s) of the blade engage the material to be cut, movement of the durable diamond chips causing material removal.
  • the body is constructed of a less durable material than the segments, the body is not useful for cutting. Further, in order to reduce the drag which would otherwise be associated with the body rotating directly against the material being cut, the body normally has a thickness which is less than that of the cutting segments (see Figure 2) .
  • This blade configuration suffers from a significant drawback. When the blade is used it removes material from the base material being cut. Ultimately, most of this material is expelled from the slot being cut in the material by either the rotation of the blade, or in wet cutting operations, by being washed out of the slot.
  • the wear is so great that the body is undercut to a point that it will no longer support the cutting segment (see Figure 3) .
  • one or more of the segments each of which subjected to large shearing forces, may be removed from the body during cutting. Once one or more of the segments are removed from the body, the blade is useless. This may be true even though the more valuable cutting segments are worn very little.
  • a cutting blade is coated with a refractory metal coating to increase the wear characteristics of the blade.
  • the blade includes a disc-shaped body having an outer edge on which is mounted one or more cutting segments.
  • a coating of tungsten carbide extends over a portion of each side of the blade.
  • the coating extends over the sides of the cutting segments and radially inwardly over the sides of the body.
  • the thickness of the coating at the edge of the body of the blade is preferably at least equal to the thickness or width of the cutting segment at the edge of the body.
  • the thickness of the coating preferably decreases radially inwardly of the edge of the body. Concentric grooves are located in the body radially inward of the edge of the body. The coating fills the grooves.
  • the coating is preferably deposited utilizing a high- velocity oxy fuel gun.
  • the gun burns liquid fuel creating a heated, high velocity gas stream.
  • a powdered mixture of tungsten carbide plus chromium carbide and boride is fed into the gas stream, where it liquifies.
  • the liquid tungsten carbide mixture is expelled from the gun at over 3000 feet per second and is deposited on a side of the blade at a rate between about 20 and 30 pounds per hour.
  • the liquid tungsten carbide mixture cools into a compressed solid metal coating on the outside of the blade.
  • FIGURE 1 is a perspective view of a cutting blade of the type known in the prior art
  • FIGURE 2 is a cross-sectional view of the prior art cutting blade illustrated in Figure 1 through line 2-2;
  • FIGURE 3 is a cross-section view of the prior art cutting blade of Figure 2 after substantial undercutting of the segment has occurred;
  • FIGURE 4 is a cross-sectional view of a blade in accordance with a first embodiment of the present invention.
  • FIGURE 5 is a cross-sectional view of a blade in accordance with a second embodiment of the present invention.
  • FIGURE 6 is a cross-section view of a blade in accordance with a third embodiment of the present invention.
  • FIG. 3 illustrates a cutting blade 10 in accordance with the present invention.
  • the blade 10 comprises a central body or core 12 having a number of cutting segments 14 located thereon, and having a refractory coating 28 extending over at least a portion of the body 12.
  • the body 12 of the blade is constructed of metal, such as steel, aluminum, or another similar material which has sufficient strength so as to support the cutting segments 14 during cutting.
  • the body 12 is disc-shaped, having a first side 16, second side 18, and a peripheral edge 20 defining the outer circular shape of the body.
  • the body 12 also includes a central aperture 22 for mounting the blade on the drive shaft (not shown) of a saw, as is well known in the art.
  • the thickness and diameter of the body 12 of the blade 10 vary substantially depending on the type of blade and its application.
  • the cutting segments 14 comprise diamond (or other durable abrasive material) particles 24 located in a matrix material 26, the matrix material typically comprising iron, nickel, or a variety of other matrix materials well known in the art.
  • the diamond particles 24 are bound to or embedded in the matrix material 26.
  • the matrix material 26 is less durable than the diamond particles 24, so that during use of the blade 10, new particles 24 are continually exposed as the matrix material 26 is worn away.
  • the composition of the matrix material 26 may vary widely depending on the desired rate of diamond chip 24 exposure for the material being cut.
  • Each cutting segment 14 has two outwardly facing sides 30, 32 and an outer end 34 which define cutting surfaces, and a base 36 which is preferably connected to the outer edge 20 of the body 12 of the blade 10 via welding, brazing or the like.
  • a durable or refractory coating 28 covers at least a portion of the body 12 of the blade 10.
  • the coating 28 comprises a coating which is primarily compressed, solidified tungsten carbide.
  • the coating 28 may comprise other refractory metal material(s), such as other metal carbides, borides, nitrides, suicides or oxides.
  • a first groove and second groove 40a, , 42a,b or other surface indentation or recess are preferably formed in each side 16,18 of the blade body 12.
  • the grooves 40a,b, 42a,b extend all the way around the body 12 adjacent the segments 14 in concentric fashion.
  • the coating 28 extends over a portion of each side 16,18 of the body 12. In particular, the coating 28 extends over each side 30,32 of the segment 14, and across where the body 12 meets the cutting segment 14 to a point radially inward therefrom.
  • the coating 28 fills in at least part of, and preferably all of the grooves 40,42, aiding in adherence of the coating 28 to the blade 10.
  • the thickness of the coating 28 preferably decreases as its radial distance from the edge 20 of the body 12 increases.
  • the coating 28 tapers in thickness, preferably at a relatively uniform rate, although the taper may alternatively be in step-wise fashion, with respect to its radial distance from the edge 20. It is desirable for the coating 28 to extend radially inwardly at least as far as the cutting depth of the blade. Alternatively, the coating may extend inwardly at least as far as the depth of the gullets or cut-outs in the blade 10, or across the encire body to the central aperture 22.
  • the coating 28 when the coating 28 has the above- described profile, it fills in the space between the portion of the base 36 of the cutting segment 14 which overhangs or extends beyond the respective side 16, 18 of the body 12 of the blade 10.
  • the coating 28 thus forms a sort of "ramp" between the sides 16, 18 of the body 12 of the blade 10 and the corresponding sides 30, 32 of the cutting segments 14.
  • the present invention includes a method for creating the above-described blade coating. First, as detailed above, at least one, and preferably two grooves 40,42 are formed (for example during molding or by machining) around and in the body 12 of the blade 10.
  • the coating 28 is formed on the blade 10 by directing liquid tungsten carbide mixture at the blade 10 at a speed over 3000 feet per second.
  • a high velocity oxy fuel (HVOF) gun and more particularly a model JP5000 gun available from Hobart Tafa Technologies of Concord, New Hampshire, is utilized in this method.
  • HVOF high velocity oxy fuel
  • liquid is burned in a combustion chamber and the resultant gases accelerate through a nozzle.
  • a mixture of tungsten carbide, boride and chromium carbide in particulate or powder form is fed into the gas stream in the HVOF gun at a rate of approximately 25-30 pounds per hour. The particles liquify in the gas stream, and are expelled from the gun at rates of speed over 3000 feet per second.
  • the resulting cooled and solidified metal coating is in compression, having a high icrohardness (900-1400 DPH (diamond pyramid hardness) at 300g) (as compared to coatings produced by spraying material from guns employing other processes and lower particle speeds, where the resulting coating has a much lower hardness (350-1000 DPH-300g) ) .
  • coatings having a maximum thickness of .25 inches are achievable, as opposed to other similar coating processes where the coating may be limited to 20-40 mils or less.
  • the discharge end of the gun is directed at a side of the blade 10, with the liquid refractory coating material expelled from the gun and deposited on the blade.
  • the deposition rate is preferably over about 20 pounds/hour, achievable with the above-stated gun.
  • the liquid refractory metal is directed towards the edge 20 of the body 12 for a longer period of time than those areas located radially inwardly from the edge 20, creating a coating 28 with its greatest thickness near the edge 20. Coating deposition continues until the coating profile described above is attained.
  • a second embodiment blade of the present invention is illustrated in Figure 5.
  • the coating 128 is located over all or a portion of each side 116,118 of the body 112 of the blade 110 and the sides 130,132 of the cutting segment(s) 114, just as described above. In this embodiment, however, no grooves are located in the body 112 of the blade 110.
  • a third embodiment blade 210 of the present invention is illustrated in Figure 6.
  • the coating 228 extends only over the sides 216,218 of the body 212 of the blade 210, and not over the sides 230,232 segment(s) 214.
  • the coating 228 extends from the edge 220 of the body 212 of the blade 210 radially inwardly. While not shown, this coating 238 profile may be utilized when one or more grooves are located in the body 212 of the blade 210.
  • the thickness of the coating 228 varies with respect to its radial distance from the edge 220 of the body 212.
  • the thickness of the coating at the edge 220 of the body 212 is equal to the distance by which the segment extends axially outwardly from the respective sides 216,218 of the body 212.
  • the combined thickness of the body 220 and the coating 228 on each side thereof is approximately equal to the total thickness of the cutting segment 214.
  • This coating profile is desirable from the standpoint that it may eliminate the need to "dress” the blade before use.
  • the coating must be removed before cutting will occur. This is normally accomplished by "dressing" the blade before use by removing the coating and exposing the cutting sides (and thus the cutting diamond particles) of the segment(s) .
  • this embodiment blade 210 makes more difficult the process of coating the blade 210.
  • the coated blade of the present invention has significant advantages over the prior art blades. Foremost, the extremely hard coating on the sides of the blade significantly reduces the rate of blade body wear during use. Thus, the problems associated with segment undercutting are significantly reduced, greatly increasing the useful life of the blade.
  • the cause of the wear is also believed reduced.
  • One of the reasons segment undercut is believed to occur is the build ⁇ up of removed material created as a result of cutting near the connection of the body and cutting segment. It is believed that material may become trapped in this area, increasing the rate of wear adjacent the cutting segment.
  • the coating fills in the "overhang" where the base of the cutting segment extends outwardly beyond the sides of the thinner blade body. During use, removed material may not become trapped, believed to reduce the root cause of the wear.
  • the coating may be deposited in a uniform thickness and extend over all or a portion of the blade 10 or body 12. It is generally desirable that the thickness of the coating be chosen so that the thickness of the body of the blade in combination with the coating be less than the uncoated thickness of the cutting segment. If the combined thickness of the coating and body is equal to or greater than the cutting segment, the coated body portion of the blade may drag during cutting.
  • the coating While it is possible for the coating to have thickness at any point where the combined thickness of the body or core and coating is greater than the cutting segment, this is generally undesirable.
  • the coating 28,128,228 be used with blades 10,110,210 having individual cutting segments spaced about the edge of the body, or a single cutting segment which extends entirely around the perimeter of the body.
  • tungsten carbide is the preferred coating material, other coatings are contemplated. Other materials which have refractory qualities (i.e. providing wear resistance to an underlying blade) and which may be positioned on the outside surface of an already formed blade in the profile and/or method as disclosed above are contemplated.
  • the coating is preferably a cermet or ceramic in nature, however, formed from wear resistant metal carbides, borides, nitrides, suicides or oxides.
  • the grooves 40,42 are utilized to improve adherence of the coating 28 to the blade 10.
  • the grooves may take a variety of other shapes. Small apertures or the like may pass into or entirely through the blade, the coating filling this space and possibly even forming a contiguous segment of material through the blade.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Mining & Mineral Resources (AREA)
  • Polishing Bodies And Polishing Tools (AREA)

Abstract

Un revêtement réfractaire (28) recouvre une partie de la lame de coupe au diamant (10) constituée d'un élément en forme de disque (12) sur le rebord duquel un ou plusieurs segments de coupe (14) sont disposés. Une ou plusieurs rainures (40, 42) sont ménagées dans le flan de l'élément constituant la lame. Le revêtement (28) est constitué en diffusant un mélange liquide de carbure de tungstène sur chacune des faces de la lame (10) à une vitesse de plus de 3.000 pieds par seconde. Le carbure de tungstène est dirigé contre la lame (10) ce qui donne un revêtement de métal solidifié sur chaque face de cet élément et qui comble tout dépassement des segments par rapport à l'élément constituant la lame et les rainures ménagées dans celui-ci.
PCT/US1997/005288 1996-04-04 1997-04-04 Procede de revetement d'une lame de coupe presentant des caracteristiques ameliorees de resistance a l'usure Ceased WO1997037774A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU26001/97A AU2600197A (en) 1996-04-04 1997-04-04 Method of coating a cutting blade having improved wear characteristics

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US62857496A 1996-04-04 1996-04-04
US08/628,574 1996-04-04

Publications (1)

Publication Number Publication Date
WO1997037774A1 true WO1997037774A1 (fr) 1997-10-16

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PCT/US1997/005288 Ceased WO1997037774A1 (fr) 1996-04-04 1997-04-04 Procede de revetement d'une lame de coupe presentant des caracteristiques ameliorees de resistance a l'usure

Country Status (2)

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AU (1) AU2600197A (fr)
WO (1) WO1997037774A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0940237A1 (fr) * 1998-03-06 1999-09-08 Quintilio Lupi Système modulaire de lames de scies circulaires pour former des surfaces courbées dans des pièces en marbre, pierre ou matériaux similaires
EP1167564A1 (fr) * 2000-06-23 2002-01-02 Linde Gas Aktiengesellschaft Element de coupe avec revêtement appliqué par pulvérisation thermique et procédé de fabrication du revêtement
EP1048385A4 (fr) * 1997-12-16 2007-02-21 Kanefusa Knife & Saw Outil en forme de disque
EP2094424A4 (fr) * 2006-11-16 2014-03-05 Shinhan Diamond Ind Co Ltd Outil diamant et procédé de fabrication de segment de celui-ci

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4626476A (en) * 1983-10-28 1986-12-02 Union Carbide Corporation Wear and corrosion resistant coatings applied at high deposition rates
GB2176683A (en) * 1985-06-21 1987-01-07 George Lucas Rotary lawn mower blade
US5033579A (en) * 1988-03-10 1991-07-23 Emiel Vanderstraeten Sound-and/or vibration-damping coating, element provided with said coating and process for applying the latter
US5075129A (en) * 1989-11-27 1991-12-24 Union Carbide Coatings Service Technology Corporation Method of producing tungsten chromium carbide-nickel coatings having particles containing three times by weight more chromium than tungsten

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4626476A (en) * 1983-10-28 1986-12-02 Union Carbide Corporation Wear and corrosion resistant coatings applied at high deposition rates
GB2176683A (en) * 1985-06-21 1987-01-07 George Lucas Rotary lawn mower blade
US5033579A (en) * 1988-03-10 1991-07-23 Emiel Vanderstraeten Sound-and/or vibration-damping coating, element provided with said coating and process for applying the latter
US5075129A (en) * 1989-11-27 1991-12-24 Union Carbide Coatings Service Technology Corporation Method of producing tungsten chromium carbide-nickel coatings having particles containing three times by weight more chromium than tungsten

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1048385A4 (fr) * 1997-12-16 2007-02-21 Kanefusa Knife & Saw Outil en forme de disque
EP0940237A1 (fr) * 1998-03-06 1999-09-08 Quintilio Lupi Système modulaire de lames de scies circulaires pour former des surfaces courbées dans des pièces en marbre, pierre ou matériaux similaires
WO1999044798A1 (fr) * 1998-03-06 1999-09-10 Quintilio Lupi Systeme modulaire de lames de scie circulaires pour former des surfaces courbes dans le marbre, la pierre et analogue
US6142139A (en) * 1998-03-06 2000-11-07 Lupi; Quintilio System of modular elements for machining marble, stone and the like
US6371103B1 (en) 1998-03-06 2002-04-16 Quintilio Lupi System of modular elements for machining marble, stone and the like
EP1167564A1 (fr) * 2000-06-23 2002-01-02 Linde Gas Aktiengesellschaft Element de coupe avec revêtement appliqué par pulvérisation thermique et procédé de fabrication du revêtement
EP2094424A4 (fr) * 2006-11-16 2014-03-05 Shinhan Diamond Ind Co Ltd Outil diamant et procédé de fabrication de segment de celui-ci

Also Published As

Publication number Publication date
AU2600197A (en) 1997-10-29

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