WO2005017317A1 - Rotary cutting bit with material-deflecting ledge - Google Patents

Rotary cutting bit with material-deflecting ledge Download PDF

Info

Publication number
WO2005017317A1
WO2005017317A1 PCT/SE2004/001184 SE2004001184W WO2005017317A1 WO 2005017317 A1 WO2005017317 A1 WO 2005017317A1 SE 2004001184 W SE2004001184 W SE 2004001184W WO 2005017317 A1 WO2005017317 A1 WO 2005017317A1
Authority
WO
WIPO (PCT)
Prior art keywords
shoulder
front surface
cutting bit
cutting
ring
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/SE2004/001184
Other languages
English (en)
French (fr)
Inventor
Gregory David Mercier
Gary A. Fuller
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.)
Sandvik Intellectual Property AB
Sandvik AB
Original Assignee
Sandvik Intellectual Property AB
Sandvik 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 Sandvik Intellectual Property AB, Sandvik AB filed Critical Sandvik Intellectual Property AB
Priority to CA002492678A priority Critical patent/CA2492678C/en
Priority to CN2004800010686A priority patent/CN1701161B/zh
Priority to EP04775305A priority patent/EP1543217B1/en
Priority to BR0405655-8A priority patent/BRPI0405655A/pt
Priority to JP2006523163A priority patent/JP4680906B2/ja
Priority to AU2004237907A priority patent/AU2004237907B2/en
Priority to DE602004010043T priority patent/DE602004010043T2/de
Priority to MXPA05001231A priority patent/MXPA05001231A/es
Priority to NO20045431A priority patent/NO330041B1/no
Publication of WO2005017317A1 publication Critical patent/WO2005017317A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • B28D1/18—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by milling, e.g. channelling by means of milling tools
    • B28D1/186—Tools therefor, e.g. having exchangeable cutter bits
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C23/00—Auxiliary devices or arrangements for constructing, repairing, reconditioning, or taking-up road or like surfaces
    • E01C23/06—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road
    • E01C23/12—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road for taking-up, tearing-up, or full-depth breaking-up paving, e.g. sett extractor
    • E01C23/122—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road for taking-up, tearing-up, or full-depth breaking-up paving, e.g. sett extractor with power-driven tools, e.g. oscillated hammer apparatus
    • E01C23/127—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road for taking-up, tearing-up, or full-depth breaking-up paving, e.g. sett extractor with power-driven tools, e.g. oscillated hammer apparatus rotary, e.g. rotary hammers
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21C—MINING OR QUARRYING
    • E21C35/00—Details of, or accessories for, machines for slitting or completely freeing the mineral from the seam, not provided for in groups E21C25/00 - E21C33/00, E21C37/00 or E21C39/00
    • E21C35/18—Mining picks; Holders therefor
    • E21C35/183—Mining picks; Holders therefor with inserts or layers of wear-resisting material
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21C—MINING OR QUARRYING
    • E21C35/00—Details of, or accessories for, machines for slitting or completely freeing the mineral from the seam, not provided for in groups E21C25/00 - E21C33/00, E21C37/00 or E21C39/00
    • E21C35/18—Mining picks; Holders therefor
    • E21C35/183—Mining picks; Holders therefor with inserts or layers of wear-resisting material
    • E21C35/1837—Mining picks; Holders therefor with inserts or layers of wear-resisting material characterised by the shape

Definitions

  • the present invention relates to cutting tools used to cut through soft ground or through relatively soft material that has been laid on the ground, such as asphalt roadways.
  • Mining, excavating, and road resurfacing operations are typically performed by forcing rotary cutting bits through the material being cut.
  • the cutting bits are mounted on a driven support, such as a rotary drum, fixed beam, or the like to be forced through the material.
  • a typical cutting bit comprises a hard cemented carbide tip that is brazed to the front surface of a steel shank.
  • the shank is to be mounted in a holder by means of a retainer sleeve which permits the bit to rotate freely relative to the holder about the bit's center axis, while being restrained against axial dislodgment from the holder.
  • the tip Due to being freely rotatable, the tip is basically self- sharpening. It should be understood that cutting mechanisms of the type described above have been used to cut through hard materials, such as rock and ice, in addition to cutting through softer materials such as asphalt. During the cutting of rock, the highest rate of bit wear occurs at the carbide tip, so the wear life of the bit is determined by the carbide tip. However, during the cutting of relatively softer material, such as asphalt, coal, and salt, the highest rate of wear occurs at the shank, i.e., erosion caused by cut asphalt rubbing and impacting against the shank. Thus, when cutting asphalt during a road resurfacing operation, the wear life of the cutting bit is determined by the shank.
  • a cutting bit includes a body having a front surface and a side surface, the side surface including a shoulder below the front surface and extending substantially perpendicular to a central axis of the body, the body being no larger in diameter above the shoulder than at the shoulder, and a ring that is harder than the body attached to the body at a front surface of the shoulder.
  • a cutting bit in accordance with another aspect of the present invention, includes a body having a front surface and a cylindrical side surface portion, the cylindrical side , surface portion including a shoulder below the front surface and extending substantially perpendicular to a central axis of the body, and a ring that is harder than the body attached to the body at a front surface of the shoulder.
  • a distance between the front surface and a top of the ring divided by a distance between the front surface and a bottom surface of the body is 0.15 to 0.5.
  • a cutting bit in accordance with yet another aspect of the present invention, includes a body having a front surface and a cylindrical side surface portion, the cylindrical side surface portion including a shoulder below the front surface and extending substantially perpendicular to a central axis of the body, a cutting tip attached to the front surface, and a ring that is harder than the body attached to the body at a front surface of the shoulder.
  • a diameter of a bottom of the cutting tip divided by the diameter of the body at the bottom of the cutting tip is 0.72 to 0.95.
  • a cutting bit in accordance with yet another aspect of the present invention, includes a body having a front surface and a cylindrical side surface portion, the cylindrical side surface portion including a shoulder below the front surface and extending substantially perpendicular to a central axis of the body, a cutting tip attached to the front surface, and a ring that is harder than the body attached to the body at a front surface of the shoulder.
  • a diameter of the cutting bit divided by an outside diameter of the ring is 0.60 to 0.80.
  • a cutting bit includes a body having a front surface and a side surface, the side surface including a first shoulder below the front surface and extending substantially perpendicular to a central axis of the body, the body being no larger in diameter above the first shoulder than at the first shoulder, and a second shoulder below the first shoulder, the body being no larger in diameter above the second shoulder than at the second shoulder, and a first ring and a second ring attached to the body at a front surface of, respectively, the first shoulder and the second shoulder.
  • a cutting tip for being attached to a cutting bit includes a base portion, a tip portion, the tip portion being generally convex in shape, and a side portion extending between the base portion and the tip portion, the side portion being generally concave in shape.
  • a cutting bit includes a cutting tip having a base portion, a tip portion, the tip portion being generally convex in shape, and a side portion extending between the base portion and the tip portion, the side portion being generally concave in shape and intersecting with the tip portion at a junction.
  • the cutting bit also includes a body having a front face to which the cutting tip is attached, a bottom portion, and a shoulder below the front surface and extending substantially perpendicular to a central axis of the body, and a ring that is harder than the body attached to the body at a front surface of the shoulder.
  • An imaginary cone is defined by the junction and the bottom portion and the ring is disposed inside of the cone.
  • Fig. 1 is a side elevational view of a rotary cutting bit according to an embodiment of the present invention
  • Fig. 2 is a side elevational view of a rotary cutting bit according to an embodiment of the present invention showing an accumulation of cut material on the bit
  • Fig. 3 is a side elevational view of a rotary cutting bit according to another embodiment of the present invention.
  • FIGS. 1 and 2 A cutting bit 21 according to an embodiment of the present invention is shown in FIGS. 1 and 2.
  • the cutting bit 21 includes a body 23 having a front surface 25 and a side surface 27.
  • the side surface 27 includes a shoulder 29 below the front surface 25 and extending substantially perpendicular to a central axis of the body.
  • a cutting tip 31 is preferably attached to the front surface 25, usually by brazing, the cutting tip preferably being harder than the body 23.
  • a ring 33 that is preferably harder than the body 23 is attached to the body at a front surface 35 of the shoulder 29, such as by brazing.
  • the body 23 is preferably no larger in diameter above the shoulder 29 than at the shoulder and, preferably, at least a portion 37 of the side surface 27 of the body 23 is cylindrical, more preferably circularly cylindrical, above the shoulder 29 so that a ring having a circular inside diameter can be slid over the body to the shoulder. Because the body 23 is preferably no larger in diameter above the shoulder 29 than at the shoulder, it is not necessary to incur machining costs for machining a groove in the body. Also, the body 23 can be cold formed.
  • the ring 33 is preferably positioned above the shoulder 29 and brazed to the body 23 in the same operation, which can minimize manufacturing costs, particularly when compared with bits wherein a groove must be formed.
  • the shoulder 29 can be part of a groove in the side surface and the ring can be, for example, a split ring that is held in place by upper and lower surfaces of the groove.
  • the ring 33 is illustrated as being a substantially circular shape, however, it will be appreciated that the ring can be any desired shape, such as hexagonal, octagonal, etc.
  • the body 23' includes a second shoulder 39 below the first shoulder 29. Again, the body 23' is preferably no larger in diameter above the second shoulder 39 than at the second shoulder to facilitate sliding a second ring 41 over the body to the second shoulder where it is attached to the body at a front surface of the second shoulder.
  • the shoulder 39 can be part of a groove in the side surface and the ring 41 can be, for example, a split ring that is held in place by upper and lower surfaces of the groove.
  • a distance A between the front surface 25 and a top 43 of the ring 33 divided by a distance B between the front surface and a bottom surface 45 of the body is preferably 0.15 to 0.5. It is intended that material being cut will accumulate on the ring 33 and the material will prevent erosion of the body 23 between the ring and the cutting tip 31 by deflecting further material.
  • a flange 47 which is preferably integral with the body, is preferably provided at the bottom of the body 23.
  • Cut material tends to accumulate on the flange 47 in a manner similar to the manner in which material accumulates on the ring 33.
  • a wear pattern between a cutting tip and a bottom flange on a body would tend to approximate the "golf tee" shape shown by the dotted line X in FIG. 2. It has been found that providing the ring 33 in a region that would ordinarily be subject to significant erosion results in a substantially reduced volume loss of material from the body 23 and tends to approximate the double "golf tee" shape shown as the shaded area Y in FIG. 2.
  • a second shoulder 39 and ring 41 are provided as in FIG. 3, it is preferred that a distance A' between the front surface 25 and a top 49 of the second ring 41 divided by the distance B between the front surface and a bottom surface 45 of the body is, as with the first ring 33, 0.15 to 0.5. This tends to place both the first ring 33 and the second ring 41 in what would otherwise be a region of maximum erosion on the body 23.
  • a diameter C of the cutting tip 31 divided by a diameter D of the body 23 at the bottom of the cutting tip is preferably 0.72 to 0.95.
  • the front surface 25 is preferably recessed to define a dam wall 51 in which the cutting tip 31 is attached by brazing.
  • Purposes of the dam wall 49 include preventing brazing liquid from flowing out from between the cutting tip 31 and the front surface 25 and acting as a stress reliever when the body 23 cools off. As C/D becomes closer to 1 , the thickness of the dam wall 49 is reduced and less material is needed to form the body 23. As C/D moves from 1 toward 0, the body 23 has more material and its useful life span tends to approach that of the cutting tip 31 made of harder material.
  • the diameter C of the cutting tip 31 divided by an outside diameter E of the ring is preferably 0.60 to 0.80.
  • the cutting tip 31 preferably has a bottom surface 52 that is brazed to the front surface 25 inside the dam wall 49, a concave surface portion 53 extending upwardly to a break point 55, and a tip portion 57 that is generally convex.
  • an imaginary cone 59 extends through a point 61 on the outer edge of the flange 47 and the break point 55 to a point 63 above the tip portion 57 along the center axis of the body 23. It has been found desirable to keep all points on the cutting bit 21, including points on the ring 33, inside or at least substantially inside of this cone 59.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Earth Drilling (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)
  • Road Repair (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Drilling And Exploitation, And Mining Machines And Methods (AREA)
  • Cable Accessories (AREA)
  • Drilling Tools (AREA)
  • Control And Other Processes For Unpacking Of Materials (AREA)
  • Crushing And Pulverization Processes (AREA)
  • Excavating Of Shafts Or Tunnels (AREA)
PCT/SE2004/001184 2003-08-15 2004-08-11 Rotary cutting bit with material-deflecting ledge Ceased WO2005017317A1 (en)

Priority Applications (9)

Application Number Priority Date Filing Date Title
CA002492678A CA2492678C (en) 2003-08-15 2004-08-11 Rotary cutting bit with material-deflecting ledge
CN2004800010686A CN1701161B (zh) 2003-08-15 2004-08-11 具有材料偏转突出部的旋转切削头
EP04775305A EP1543217B1 (en) 2003-08-15 2004-08-11 Rotary cutting bit with material-deflecting ledge
BR0405655-8A BRPI0405655A (pt) 2003-08-15 2004-08-11 Broca de corte rotativa com borda de desvio de material
JP2006523163A JP4680906B2 (ja) 2003-08-15 2004-08-11 素材逸らせ段部を有する回転切削ビット
AU2004237907A AU2004237907B2 (en) 2003-08-15 2004-08-11 Rotary cutting bit with material-deflecting ledge
DE602004010043T DE602004010043T2 (de) 2003-08-15 2004-08-11 Drehschneideinsatz mit materialablenkleiste
MXPA05001231A MXPA05001231A (es) 2003-08-15 2004-08-11 Trepano cortante giratorio con filon que desvia material.
NO20045431A NO330041B1 (no) 2003-08-15 2004-12-13 Roterende skjaerspiss med materialavboyende kant

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US10/641138 2003-08-15
US10/641,138 US7204560B2 (en) 2003-08-15 2003-08-15 Rotary cutting bit with material-deflecting ledge

Publications (1)

Publication Number Publication Date
WO2005017317A1 true WO2005017317A1 (en) 2005-02-24

Family

ID=34136265

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE2004/001184 Ceased WO2005017317A1 (en) 2003-08-15 2004-08-11 Rotary cutting bit with material-deflecting ledge

Country Status (15)

Country Link
US (3) US7204560B2 (https=)
EP (1) EP1543217B1 (https=)
JP (1) JP4680906B2 (https=)
KR (1) KR101037881B1 (https=)
CN (1) CN1701161B (https=)
AT (1) ATE378503T1 (https=)
AU (1) AU2004237907B2 (https=)
BR (1) BRPI0405655A (https=)
CA (1) CA2492678C (https=)
DE (1) DE602004010043T2 (https=)
ES (1) ES2293338T3 (https=)
MX (1) MXPA05001231A (https=)
NO (1) NO330041B1 (https=)
WO (1) WO2005017317A1 (https=)
ZA (1) ZA200500075B (https=)

Cited By (5)

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DE102007009711A1 (de) * 2007-02-28 2008-09-04 Betek Bergbau- Und Hartmetalltechnik Karl-Heinz Simon Gmbh & Co. Kg Rundschaftmeißel
WO2010117376A1 (en) * 2009-04-08 2010-10-14 Kennametal Inc. Rotatable cutting tool with continuous arcuate head portion
US8535407B2 (en) 2008-09-15 2013-09-17 Element Six Gmbh Hard-metal
US8968834B2 (en) 2008-09-15 2015-03-03 Igor Yuri Konyashin Wear part with hard facing
DE102018109147A1 (de) * 2018-04-17 2019-10-17 Betek Gmbh & Co. Kg Fräsmeißel

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CA2492678C (en) 2008-04-15
ES2293338T3 (es) 2008-03-16
CN1701161B (zh) 2012-11-14
US7204560B2 (en) 2007-04-17
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US20050035649A1 (en) 2005-02-17
AU2004237907B2 (en) 2006-06-29
EP1543217B1 (en) 2007-11-14
EP1543217A1 (en) 2005-06-22
DE602004010043T2 (de) 2008-09-11
NO20045431L (no) 2005-02-14
ATE378503T1 (de) 2007-11-15
DE602004010043D1 (de) 2007-12-27
US20070182239A1 (en) 2007-08-09
MXPA05001231A (es) 2005-05-19
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JP2007502714A (ja) 2007-02-15
US20080030066A1 (en) 2008-02-07

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