EP0351245A1 - Schneidwerkzeug für eine Gewinnungsmaschine - Google Patents

Schneidwerkzeug für eine Gewinnungsmaschine Download PDF

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Publication number
EP0351245A1
EP0351245A1 EP89307189A EP89307189A EP0351245A1 EP 0351245 A1 EP0351245 A1 EP 0351245A1 EP 89307189 A EP89307189 A EP 89307189A EP 89307189 A EP89307189 A EP 89307189A EP 0351245 A1 EP0351245 A1 EP 0351245A1
Authority
EP
European Patent Office
Prior art keywords
cutting
cutting tool
edge
abrasive compact
outer edge
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.)
Granted
Application number
EP89307189A
Other languages
English (en)
French (fr)
Other versions
EP0351245B1 (de
Inventor
Peter Noel Tomlinson
Klaus Tank
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.)
De Beers Industrial Diamond Division Pty Ltd
Original Assignee
De Beers Industrial Diamond Division Pty Ltd
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 De Beers Industrial Diamond Division Pty Ltd filed Critical De Beers Industrial Diamond Division Pty Ltd
Publication of EP0351245A1 publication Critical patent/EP0351245A1/de
Application granted granted Critical
Publication of EP0351245B1 publication Critical patent/EP0351245B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • E21C35/183—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

  • This invention relates to cutting tools for use in mining machines of the kind which are used to cut a variety of soft materials such as coal.
  • One such cutting tool comprises a holding lug and a cutting insert secured in a bore or socket in one end of the lug.
  • the cutting insert may be made of a wear-resistant material such as cemented carbide.
  • the cutting insert may comprise an elongate pin one end of which has secured to it an abrasive compact which provides a cutting edge for the insert.
  • a plurality of these cutting tools are positioned on a working surface, for example, the surface of a drum, and moved in a cutting direction against the face of the material to be cut.
  • the cutting action is a slicing action in which the cutting insert is subjected to stress only when it is in contact with the material being cut. In other words, the cutting insert is subjected to alternate conditions of stress and non-stress.
  • the invention is concerned with the cutting tools for mining machines of a type different to those discussed above.
  • the cutting tools are for machines which are used to cut soft to brittle coals in a gouging-type action.
  • Such cutting tools comprise an elongate body, a formation projecting from one side of the elongate body for securing the tool to a movable surface of a machine, and a working surface at one end of the body. That working surface has secured in it a cutting insert made of cemented carbide.
  • Cemented carbide has the disadvantage that it wears relatively quickly and also can give rise to sparking which is dangerous in a coal mining environment. With these machines, the cutting insert is always in contact with the material being cut and this always under stress when in use.
  • a cutting tool for a mining machine comprising:
  • the cutting edge is preferably provided in two sections at an angle to each other, each section being coincident with the outer edge of the planar portion in which the abrasive compact is located.
  • the two sections may both be straight or one may be straight and the other curved.
  • the abrasive compact will preferably be bonded to a cemented carbide support to form a composite abrasive compact.
  • the composite abrasive compact will be located in the recess and bonded to the body through the cemented carbide support. Bonding of the compact or the composite abrasive compact may be achieved by means of a suitable high strength braze.
  • the cutting tool comprises an elongate body 10 having a formation 12 integrally formed therewith and projecting from one side 14 thereof.
  • the body 10 has a first end 16 which provides a working planar surface 18 for the cutting tool and an opposite end 20.
  • the working surface 18 has a recess 22 formed therein. This recess extends inward from an outer edge 24 of the planar working surface 18.
  • a composite abrasive compact comprising an abrasive compact 26 bonded to a cemented carbide support 28.
  • the cemented carbide support is bonded to the body 10 by means of a suitable high strength braze.
  • the exposed outer edge of the abrasive compact is in two sections, a curved section 30 and a linear section 32. Both sections are coincident with the outer edge 24 of the planar working surface 18. This exposed outer edge of the abrasive compact provides the cutting edge for the tool.
  • the top planar surface of the abrasive compact 26 lies in the same plane as the planar working surface 18.
  • Figures 2 to 4 illustrate alternative embodiments and like parts carry like numerals.
  • the configuration of the planar working surface 18 and the configuration and shape of the composite abrasive compact varies in each case.
  • the two sections 30 and 32 of the cutting edge are both straight.
  • the composite abrasive compact is preferably a composite diamond abrasive compact. Such composite compacts are well known in the art.
  • Each of the cutting tools illustrated above may be suitably mounted in a mining machine of the type which is used to cut soft to brittle coals in a gouging-type action.
  • the cutting edges of the abrasive compacts of the tools will maintain constant contact with the material being cut.
  • the tool is caused to traverse this material at a rate of 6 metres/second or more.
  • the cutting tool ploughs its way through the coal dislodging it from the surface in which it is embedded in a scraping action. Because the cutting edge is provided by abrasive compact, the wear is much less than with a cemented carbide cutting edge, which due to the high cutting speed will tend to become blunt at a much earlier stage.
  • the compact edge remains sharp resulting in a more efficient cutting operation and reduced incidence of spark ignition. Further it has been found that the tendency for the cutting inserts, i.e. the composite abrasive compacts, to be dislodged in use is substantially reduced.
  • the interlocking configuration illustrated generally by the numeral 34 is believed to assist in this regard.

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)
EP89307189A 1988-07-15 1989-07-14 Schneidwerkzeug für eine Gewinnungsmaschine Expired - Lifetime EP0351245B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ZA885131 1988-07-15
ZA885131 1988-07-15

Publications (2)

Publication Number Publication Date
EP0351245A1 true EP0351245A1 (de) 1990-01-17
EP0351245B1 EP0351245B1 (de) 1994-03-23

Family

ID=25579336

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89307189A Expired - Lifetime EP0351245B1 (de) 1988-07-15 1989-07-14 Schneidwerkzeug für eine Gewinnungsmaschine

Country Status (2)

Country Link
EP (1) EP0351245B1 (de)
DE (1) DE68914053T2 (de)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2618335A1 (de) * 1976-04-27 1977-11-03 Titanit Bergbautechnik Gmbh & Meissel fuer kohlenhobel o.dgl.
DE3315624C1 (de) * 1983-04-29 1984-11-15 Fa. Astrid Komotzki, 4600 Dortmund Meißelkörper für Kohlenhobel
DE3500931A1 (de) * 1984-01-31 1985-08-08 De Beers Industrial Diamond Division (Proprietary) Ltd., Johannesburg, Transvaal Schneidwerkzeug
DE3439508A1 (de) * 1984-09-12 1986-03-20 Fa. Astrid Komotzki, 4600 Dortmund Halterung fuer einen hobel-, kerb- oder bodenmeissel bei kohlengewinnungsmaschinen

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2618335A1 (de) * 1976-04-27 1977-11-03 Titanit Bergbautechnik Gmbh & Meissel fuer kohlenhobel o.dgl.
DE3315624C1 (de) * 1983-04-29 1984-11-15 Fa. Astrid Komotzki, 4600 Dortmund Meißelkörper für Kohlenhobel
DE3500931A1 (de) * 1984-01-31 1985-08-08 De Beers Industrial Diamond Division (Proprietary) Ltd., Johannesburg, Transvaal Schneidwerkzeug
DE3439508A1 (de) * 1984-09-12 1986-03-20 Fa. Astrid Komotzki, 4600 Dortmund Halterung fuer einen hobel-, kerb- oder bodenmeissel bei kohlengewinnungsmaschinen

Also Published As

Publication number Publication date
DE68914053T2 (de) 1994-07-21
EP0351245B1 (de) 1994-03-23
DE68914053D1 (de) 1994-04-28

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