EP2021581A2 - Cutting tool and method of assembling the cutting tool - Google Patents

Cutting tool and method of assembling the cutting tool

Info

Publication number
EP2021581A2
EP2021581A2 EP07776670A EP07776670A EP2021581A2 EP 2021581 A2 EP2021581 A2 EP 2021581A2 EP 07776670 A EP07776670 A EP 07776670A EP 07776670 A EP07776670 A EP 07776670A EP 2021581 A2 EP2021581 A2 EP 2021581A2
Authority
EP
European Patent Office
Prior art keywords
diameter portion
tool
cutting tool
reduced diameter
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Withdrawn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
EP07776670A
Other languages
German (de)
English (en)
French (fr)
Inventor
Daniel J. Mouthaan
Kenneth S. Monyak
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
Original Assignee
Sandvik Intellectual Property 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 filed Critical Sandvik Intellectual Property AB
Publication of EP2021581A2 publication Critical patent/EP2021581A2/en
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • E21C35/19—Means for fixing picks or holders
    • E21C35/197—Means for fixing picks or holders using sleeves, rings or the like, as main fixing elements

Definitions

  • the present invention generally relates to a cutting tool and method of assembly the cutting tool. More particularly, the present invention pertains to cutting tool and method of assembling the cutting tool in a cutting tool holder.
  • Tool assemblies used to cut hard surfaces typically include a rotating wheel or drum with a plurality of cutting tools mounted around circumference of the wheel or drum. Each cutting tool is rotatably mounted within a cylindrical bore of the rotating drum.
  • the material cut by such tools is so abrasive that the cutting tools become worn in just one day's use, and frequently need to be replaced. Therefore, replacement of such tools must be relatively easy to accomplish.
  • Each cutting tool typically includes a tapered forward cutting end with a carbide tip, and a major flare diameter portion spaced from the carbide tip. Disposed between the carbide tip and the major flare diameter portion is a puller groove.
  • the puller groove is used for extracting the tool from the holder via an extractor tool. When there is not sufficient access to the rear of the tool to punch them out, this is the most desirable method.
  • This groove is typically machined in the cutting tool, which is very costly. In addition, because the groove is machined close to the tip of the cutting tool, it is susceptible to wear.
  • the cutting tool also includes a shank at its rearward end.
  • a compressible sleeve is disposed about the shank to fit the tool within the bore of the tool holder.
  • a washer may be used to help compress the sleeve when it is assembled into the tool holder. When assembled, the major flare diameter portion of the cutting tool is disposed adjacent the washer.
  • the cutting tool rotates within the compressible spring sleeve. As such, the major flare diameter portion rubs against the washer. Because the largest portion of the cutting tool is disposed adjacent the washer, the surface contact is maximized causing excess friction between the washer and the cutting tool.
  • a tool body includes a first end for receiving a cutting tip and a second end for mounting in the tool holder.
  • the tool body includes a tapered forward cutting end.
  • a major flare diameter portion is disposed adjacent the forward cutting end.
  • the reduced diameter portion is disposed adjacent the major flare diameter portion.
  • a shank is disposed adjacent the reduced diameter portion.
  • a compressible sleeve is disposed about the shank.
  • a washer is disposed adjacent to the reduced diameter portion when the cutting tool is retained within the tool holder.
  • a cutting tool having a tool body with a first end for receiving a cutting tool and a second end for mounting in a tool holder.
  • the tool body includes a tapered forward cutting end, a major flare diameter portion disposed adjacent the forward cutting end, a reduced diameter portion disposed adjacent the major flare diameter portion, and a shank disposed adjacent the reduced diameter portion.
  • a compressible sleeve is fitted about the shank of the cutting tool.
  • a washer is fitted about the cutting tool.
  • a tool body includes a first end for receiving a cutting tip and a second end mounted in a tool holder.
  • the tool body includes a tapered forward cutting end.
  • the cutting tip is disposed in the first end of the tool body.
  • a major flare diameter portion is disposed adjacent the forward cutting end.
  • the reduced diameter portion is disposed adjacent the major flare diameter portion.
  • a shank is disposed adjacent the reduced diameter portion.
  • a compressible sleeve is disposed about the shank.
  • a washer is disposed adjacent to the reduced diameter portion when the cutting tool is retained within the tool holder.
  • FIG. 1 illustrates a side elevational view, partly in cross section of an exemplary cutting tool of the present invention and a holder.
  • FIG. 2 illustrates a side elevational view of an exemplary cutting tool of the present invention.
  • FIG. 3 illustrates a side elevational view of an exemplary cutting tool according to the prior art.
  • FIG. 4 illustrates a side elevational view an exemplary tool body of the present invention.
  • FIG. 5 illustrates a side elevational view of an exemplary compressible sleeve according to the present invention.
  • Fig. 5 A is a cross-sectional view of the compressible sleeve of Fig. 5 taken along line 5A- 5A.
  • FIG. 6 illustrates a top plan view of an exemplary washer according to the present invention.
  • Fig. 6 A is a cross-sectional view of the washer of Fig. 6 taken along line 6A-6A.
  • Fig. 7 illustrates a side elevational view of a standard extractor tool.
  • FIG. 8 illustrates a side elevational view of the cutting tool of the present invention with the washer disposed midway along the compressible sleeve.
  • Fig. 9 illustrates a side elevational view of the cutting tool of the present invention with the washer disposed adjacent the reduced diameter portion.
  • FIGs. 1 and 2 show an exemplary embodiment of cutting tool assembly 10 and cutting tool 12 of the present invention. While the cutting tool assembly 10 is generally described as suitable for use as road milling tools, it should be understood that
  • the cutting tool assembly 10 according to the present invention is applicable to cutting tools other than road milling tools. For example, mining and trenching tools.
  • Cutting tool assembly 10 includes a cutting tool 12 mounted within a tool holder 14.
  • a plurality of cutting tools are mounted around the circumference of a drum, and are rotatable around a longitudinal axis to thereby cut a hard surface (not shown).
  • the structure of such a tool is well known in the art, and shown for example, in U.S. Patent No. 6,113,195 and U.S. Patent No. 6,481,803, the descriptions of which are incorporated herein by reference.
  • the cutting tool 12 includes a tool body 16 having a first end 18 for receiving a cutting tip 20.
  • the cutting tip 20 is a tungsten carbide cutting tip.
  • cutting tip 20 can be made of any hard material, depending on application and design preference.
  • the tool body 16 includes a tapered forward cutting end 22 and a major flare diameter portion 24 adjacent the forward cutting end 22.
  • a reduced diameter portion or puller groove 26 is disposed adjacent the major flare diameter portion 24, and is sized to receive the jaws of a standard extractor tool (see Fig. 7), which will be described in more detail below.
  • the cutting tool 12 includes a second end 28 for mounting the cutting tool 12 in the tool holder 14.
  • the second end 28 of the cutting tool 12 includes a shank portion 30 to be received within a bore 32 of the tool holder 14.
  • Disposed about the shank portion 30 is a compressible sleeve 34, preferably made from spring steel.
  • the sleeve 34 is spring-loaded to radially expand the sleeve against the inner surface of the bore 32 of the tool holder 14.
  • a washer 36 is disposed about the compressible sleeve 34 and acts to compress the sleeve 34 so that the cutting tool 12 can be mounted in the tool holder 14, which will be described in more detail below.
  • the cutting tool 12 rotates within the bore 32 of the tool holder 14, but is retained therein. Rotation of the cutting tool 12 within the bore 32 allows the cutting tool 12 to wear symmetrically, which increases the life of the cutting tool 12.
  • the cutting tool 12 of the present invention is compared to the cutting tool 40 of the prior art.
  • the cutting tool 40 of the prior art includes a tapered forward cutting end 42 which receives a cutting tip 44 at its end.
  • a reduced diameter portion 46 is disposed between the
  • a compressible retainer sleeve 50 is disposed about a shank portion 52 of the cutting tool 40 to thereby retain the cutting tool 40 within a tool holder (see, e.g., Fig. 1).
  • a washer 54 is disposed about the compressible sleeve 50, which pre-compresses the retainer sleeve 54 to facilitate mounting and retaining the cutting tool 40 within the tool holder.
  • the reduced diameter portion 46 must be machined, because it is not possible to produce such a grooved portion by cold forming, hi particular, the grooved portion does not allow for the cutting tool to be punched out of a die when cold forming.
  • machining is very expensive, and is to be avoided.
  • the surface contact between the major flare diameter portion 48 and the washer 54 is quite large, thereby increasing friction and negatively affecting rotation of the cutting tool 40 within the tool holder, causing premature wear.
  • the reduced diameter portion or puller groove 46 is located relatively close to the cutting tip 44, which causes the top surface of the groove to be worn away, rendering it useless for the puller to extract the tool.
  • the cutting tool 12 of the present invention includes major flare diameter portion 24 above the reduced diameter portion or puller groove 26.
  • the washer 36 acts as a bottom surface 36A of the puller groove 26 and the major diameter portion 24 acts as a top surface 24A of the puller groove 26.
  • friction between the top surface of the puller groove 26 and major diameter portion 24 and the cutting tool 12 is minimized because the surface contact therebetween is significantly decreased.
  • the major flare diameter portion 24 acts as one side of the puller groove 26, and is farther removed from the cutting tip 20, thereby reducing wear of the top surface 24A and major flare diameter portion 24.
  • the cutting tool 12 includes a tool body 16 having a first end 18 and a second end 28.
  • the first end 18 includes the seat 56 for receiving a cutting tip therein (not shown).
  • the first end 18 includes a tapered forward cutting portion 22 adjacent a major flare diameter portion 24.
  • a reduced diameter portion or puller groove 26 is disposed below the major flare diameter portion 24.
  • a shoulder bridging the reduced diameter portion 26 and major flare diameter portion 24 constitutes
  • the reduced diameter portion 26 is cylindrical. However, it should be understood that the reduced diameter portion 26 may take other shapes depending on application and design preference.
  • the tool body 16 also includes a shank portion 30 for mounting within a tool holder 14 (see Fig. 1). Disposed adjacent the shank portion 30 is a stepped portion 60. Preferably, a diameter of the stepped portion 60 is greater than a diameter of the shank portion 30 but is less than a diameter of the reduced diameter portion 26. The stepped portion 60 provides surface against which the compressible sleeve is retained when the compressible sleeve is mounted about the cutting tool 12.
  • tool body 16 may be formed by cold forming in which a metal blank is formed into a desired shape, thereby avoiding the significant costs of machining.
  • a blank is inserted into the die which defines the outer surface of the cutting tool, after which the blank is punched to conform it to the shape of the die.
  • tool body 16 may be made in other ways known in the art, and is not restricted to cold forming.
  • the compressible sleeve 34 and washer 36 of the present invention are similar to the compressible sleeve and washer of the prior art.
  • the compressible sleeve 34 is preferably made from a spring steel and includes an opening 70, which permits the sleeve to be compressed by the washer 36.
  • washer 36 includes a bevel 72 that tapers downwardly at an angle, which minimizes the contact between the washer 36 and the reduced diameter portion or puller groove 26 of the cutting tool 12. The structure of such a washer is shown, for example, in U.S. Patent No.
  • the sleeve 34 also includes a plurality of detents 74 (see Figs. 5 and 5A) which engage a groove 76 (see Fig. 4) disposed on the shank portion 30 of the cutting tool 12, to thereby retain the sleeve 34 on the cutting tool 12.
  • a method of assembling the cutting tool 12 of the present invention within a tool holder 14 includes fitting the compressible sleeve
  • 600538M 34 about the shank portion 30 of the cutting tool 12 so that the sleeve 34 is disposed adjacent the stepped portion 60 of the cutting tool 12.
  • a washer 36 is fitted about the second end 28 of the tool body 16 over the compressible sleeve 34 until the washer 36 is disposed about midway along the compressible sleeve 34.
  • the surface contact between the cutting tool 12 and the washer 36 is less than the surface contact between the washer 36 and the tool holder 14.
  • the washer 36 will not move, or turn on the holder, but rather remains stationary with the top surface of the holder. This will reduce the wear on the interface of the holder and the washer.
  • the increased surface area between the washer and the holder will prevent the washer from rotating, thereby reducing the wear on the top of the holder.
  • the tool will require changing long before the interface of the tool and the washer is worn away and there is a catastrophic failure at the interface.
  • the washer is replaced as well.

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)
  • Drilling And Exploitation, And Mining Machines And Methods (AREA)
  • Milling Processes (AREA)
  • Drilling Tools (AREA)
  • Road Repair (AREA)
  • Gripping On Spindles (AREA)
EP07776670A 2006-05-08 2007-05-01 Cutting tool and method of assembling the cutting tool Withdrawn EP2021581A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US11/429,439 US20070257545A1 (en) 2006-05-08 2006-05-08 Cutting tool and method of assembling the cutting tool
PCT/US2007/010714 WO2007133463A2 (en) 2006-05-08 2007-05-01 Cutting tool and method of assembling the cutting tool

Publications (1)

Publication Number Publication Date
EP2021581A2 true EP2021581A2 (en) 2009-02-11

Family

ID=38660562

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07776670A Withdrawn EP2021581A2 (en) 2006-05-08 2007-05-01 Cutting tool and method of assembling the cutting tool

Country Status (8)

Country Link
US (1) US20070257545A1 (ja)
EP (1) EP2021581A2 (ja)
JP (1) JP4829344B2 (ja)
CN (1) CN101438028B (ja)
AU (1) AU2007250003B2 (ja)
CA (1) CA2650811C (ja)
MX (1) MX2008014022A (ja)
WO (1) WO2007133463A2 (ja)

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CN105201501A (zh) * 2015-09-15 2015-12-30 安徽澳德矿山机械设备科技股份有限公司 掘进机截齿用镶套型耐磨齿座

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DE102007030658A1 (de) * 2007-07-02 2009-01-15 Betek Bergbau- Und Hartmetalltechnik Karl-Heinz Simon Gmbh & Co. Kg Schaftmeißel
DE202007018885U1 (de) * 2007-10-29 2009-09-17 Betek Bergbau- Und Hartmetalltechnik Karl-Heinz Simon Gmbh & Co. Kg Schaftmeißel
US8414084B2 (en) * 2009-07-13 2013-04-09 Sandvik Intellectual Property Ab Adaptive sleeve retainer for tool pick
WO2011016765A1 (en) * 2009-08-04 2011-02-10 Sandvik Intellectual Property Ab Non-rotating washer for tool pick, tool and block assembly, method to reduce erosive wear and material removal machine
DE102009049780B4 (de) * 2009-10-19 2016-02-18 Betek Gmbh & Co. Kg Meißel, insbesondere Rundschaftmeißel
AU2014202477B2 (en) * 2009-10-19 2017-02-02 Betek Bergbau- Und Hartmetalltechnik Karl-Heinz Simon Gmbh & Co. Kg Bit, in particular a round shaft bit
EP2601356A1 (en) * 2010-08-02 2013-06-12 Sandvik Intellectual Property Ab Rotatable grading pick with debris clearing feature, a tool and block assembly and a road grading machine
US8449041B2 (en) * 2010-10-27 2013-05-28 Sandvik Intellectual Property Ab Grading pick with extended fins
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CN105201501A (zh) * 2015-09-15 2015-12-30 安徽澳德矿山机械设备科技股份有限公司 掘进机截齿用镶套型耐磨齿座

Also Published As

Publication number Publication date
CN101438028B (zh) 2012-03-21
AU2007250003B2 (en) 2010-08-19
WO2007133463A2 (en) 2007-11-22
WO2007133463A3 (en) 2008-07-10
CA2650811C (en) 2012-08-21
JP2009536701A (ja) 2009-10-15
JP4829344B2 (ja) 2011-12-07
CA2650811A1 (en) 2007-11-22
MX2008014022A (es) 2009-01-20
US20070257545A1 (en) 2007-11-08
CN101438028A (zh) 2009-05-20
AU2007250003A1 (en) 2007-11-22

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