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

• the invention relates to a cutting device for a mining machine, in particular a cutting machine, having a tool carrier rotatably mounted about a rotation axis, in particular a cutting roller, and at least one cutting tool which is fixed to the tool carrier and which comprises a tool base body and a cutting insert which is fixed in a receiving bore and consists of a diamond cutter.
• Composite material or a harder material are examples of a cutting tool that is fixed to the tool carrier and which comprises a tool base body and a cutting insert which is fixed in a receiving bore and consists of a diamond cutter.
• Cutting tools for mining machines are known for example in the form of so-called chisels, which are used for example in the mining of coal or in tunneling.
• Ticks are usually arranged on the circumference of a cutting or cutting roller, whereby the selection of the respective cutting angle of attack ensures that the usually tapered chisels due to the rotating movement of the cutting or cutting roller in such a way with the degraded material or thefast agoden Rock come into engagement that material or rock is removed by cutting or scraping from the surface of the working face.
• Chisels usually consist of a base body and a set in a receiving bore of the body cutting insert.
• the cutting insert consists of a particularly hard and wear-resistant material.
• tungsten carbide or a tungsten carbide-cobalt composite material has been proposed in this connection.
• a particularly wear-resistant training succeeds through the use of cutting tools or chisels with a tip made of diamond or polycrystalline diamond composite material.
• the cutting insert of the cutting tool can have only an outer coating of a diamond composite material or consist entirely of such a diamond composite material.
• US 5,161,627 shows and describes a round shank bit with a cutting insert that is tapered and has a rounded tip.
• On the surface of the cutting insert is applied a layer of a polycrystalline diamond composite. The layer is about 0.04 inches (0.1 cm).
• a conical cutting insert with a coating of a polycrystalline diamond material can also be taken from US Pat. No. 4,811,801.
• the subject matter of US Pat. No. 6,733,087 mentions diamond, polycrystalline diamond material, cubic boron nitride binder, free carbide or combinations thereof as the material for a wear-resistant coating of a cutting insert.
• EP 1283936 B1 has proposed a cutting tool with a tapered cutting insert consisting of diamond crystals, which by means of a silicon carbide matrix are interconnected. For bonding the cutting insert to the tool body, a metal matrix composite is indicated.
• Diamond composite has a higher hardness than any naturally occurring material on Earth and is therefore ideal for use as a cutting insert. However, it is a very expensive material. In recent times, materials have become known which have a higher hardness than diamond. Barium titanate with tin, for example, should be harder than diamond, and it can be assumed that this material is suitable for its use as a diamond
• a cutting geometry is defined on the one hand by the shape of the chisel tip and on the other hand by the peripheral force occurring at the chisel tip and the rock-dependent one Normal force.
• the cutting geometry should be designed so that a resulting cutting force is formed, which coincides with the cutting axis, ie coincides with the axis of the chisel.
• the invention therefore aims to provide a cutting geometry that is designed and optimized for the described cutting inserts made of diamond or a diamond composite material is, so that the cutting performance can be improved, while the service life of the cutting tools are to be extended with the same constant cutting geometry.
• the invention starting from a cutting device of the type mentioned essentially consists in that the cutting tool on the tool carrier with a cutting angle of 45 - 58 °, preferably 47 - 54 °, preferably 49 °, oriented and the tip of Schneidein - Set is formed substantially conical, wherein the apex angle is 60 - 75 °.
• the angle of incision between the axis of the cutting tool or of the cutting insert and the tangent at the circle swept by the tip of the cutting insert during the rotation of the cutting device, in particular the cutting roller is to be understood as the cutting angle of attack.
• the point angle is the angle between two diametrically opposed generatrix of the cone of the cutting insert tip.
• the cutting geometry according to the invention leads to an alignment of the cutting tool that is optimized with respect to the cutting performance, whereby at the same time the so-called clearance angle ⁇ , i. the angle between the degraded rock front and the cutting tool cutting edge can be kept within the limits required to achieve a high cutting performance.
• the cutting angle of attack can be selected to be greater than with hard metal materials.
• the angle of attack is limited according to the invention but upwards. Namely, if the cutting angle is selected in a range of larger than 60 °, the direction of the resultant cutting force shifts again, resulting in a bending load of the cutting bit and a tilting load of the cutter holder in the other direction.
• the tip of the cutting insert has a tip radius of 2 - 5mm, preferably 4mm.
• the cutting insert has a cylindrical base body with a diameter of preferably 10-18 mm, which carries the conical tip, wherein between the cylindrical base body and the conical tip, a transition radius is provided, the 35 - 45 ⁇ un preferred 40mm.
• the cutting device according to the invention is preferably developed in such a way that the diameters of the cutting insert and receiving bore are dimensioned such that the cutting insert is held in the receiving bore by shrink-fit fitting.
• a further improvement of the attachment results according to a preferred development in this case in that the cutting insert is additionally held by means of a solder joint, preferably using a introduced into the receiving bore solder, preferably metal solder, in the receiving bore, wherein at the interface between the cutting insert and the solder a particularly stable connection is achieved if, as it corresponds to a further preferred embodiment, the cutting insert has an electrolytic copper coating, the thickness is preferably 0.1 to 0.2 mm.
• solder and in particular the electrolytic copper occupancy of the cutting insert is melted during soldering of the cutting insert in the bore of the tool body, wherein due to the cooling of the tool body and the resulting shrink fit of the cutting insert in the receiving bore penetration of the molten solder or the gives electrolytic copper coverage in the surface of the cutting insert and between the tool body and the cutting insert a kind of micro-toothing arises, which leads to a very strong and permanent connection between the cutting insert and Maschinentechniksvilleköper.
• a solder is preferably a copper-silver solder selected.
• the diamond composite according to a preferred development of diamond crystals, which are connected to each other by means of a silicon carbide matrix. Such a diamond composite material has become known from WO 90/01986 A1. A method of making such a diamond composite has become known from WO 88/07409 A1.
• a method for producing a cutting tool, in particular for fixing a cutting insert of a diamond composite material in a receiving bore of a tool body, a method with the following method steps can be used: a) heating of the tool body to a temperature of at least 75O 0 C, preferably 800-860 0 C, b) inserting the cutting insert into the receiving bore of the tool body, c) cooling the tool body in air to about 600 0 C, d) further cooling the tool body with water and e) preferably final annealing to about 300 0 C, wherein the cutting insert is determined by the warm-up and subsequent cooling of the tool body with a shrink-fit in the receptacle of the tool body.
• a preferred process procedure provides that an electrolytic copper coating of the cutting insert is made before step a) and that a solder, in particular a copper-silver solder, is introduced into the receiving bore between step a) and b), so that the Determining the cutting insert in the receiving bore, both due to the shrink-fit and due to a solder joint done.
• the solder is introduced in the form of a cartridge in the receiving bore.
• the possible use in highly abrasive rock is up to 165 MPa. Furthermore, the sparking during the cutting process can be completely avoided. There is also a significant reduction of dust. The cutting forces can be reduced by about 50%. Compared to carbide cutting inserts results in a 30-fold service life. Further advantages include the higher cutting performance and the lower noise and heat development, especially when cutting hard rock.
• FIG. 2 shows a cutting tool with a cutting insert made of a diamond composite material inserted into it
• FIG. 3 shows the cutting geometry of a cutting tool according to the invention, which is fastened to a cutting roller ,
• a cutting insert made of a diamond composite material which consists essentially of three regions: a cutting insert tip 2, a cutting insert main body 3 and a cutting insert end 4, is designated by 1.
• the entire cutting insert is rotationally symmetric about the central axis 10.
• the cutting insert tip is substantially frusto-conical, with the tip being rounded.
• the peak radius designated r is between 2 and 5 mm and the tip angle ⁇ , i. the angle between the two diametrically opposite generatrix of the cone is 71 ° in this embodiment.
• a tool body 5 is shown, in which a cutting insert 1 is fixed in a receiving bore 6.
• the bit consisting of tool base body 5 and cutting insert 1, is rotationally symmetrical about the central axis 10.
• the tool base body has at its front end a widening region 7, which merges directly into a skirt 8.
• the conical widening in the front area of the round shank chisel serves to stabilize the cutting tool.
• a groove 9 At the rear end of the chisel is a groove 9, in which an unillustrated snap ring can engage for fixing to a chisel holder.
• FIG 3 12 schematically shows a cutting roller on which a bit holder 11 a round shank chisel is fixed.
• the apron 8 rests on the front side of the chisel holder and thus seals the opening of the chisel holder from the ingress of dust and debris.
• the radius denoted by R corresponds to the distance between the axis of rotation of the cutting roller and the tip of the cutting insert, which is in engagement with the rock or the reduction face 13.
• the so-called clearance angle ⁇ is defined as the angle of the clearance between the tangent to the circle R (rock front) and the cutting tool edge (nearest generatrix of the cutting insert tip).
• the cutting angle ⁇ is defined as the angle between the central axis 10 of the bit and the tangent to the circle of radius R at the location of engagement. This is the circle swept by the tip of the cutting insert during one revolution of the cutting roller 12. In the case shown, this angle is 51 °.

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)
• Earth Drilling (AREA)
• Drilling And Exploitation, And Mining Machines And Methods (AREA)
• Processing Of Stones Or Stones Resemblance Materials (AREA)
• Milling Processes (AREA)

Priority Applications (8)

Applications Claiming Priority (2)

Publications (2)

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Family Applications (1)

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Citations (6)

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• 2009
  • 2009-05-14 AT AT0075009A patent/AT508231B1/de not_active IP Right Cessation
• 2010
  • 2010-05-06 CA CA2761529A patent/CA2761529A1/en not_active Abandoned
  • 2010-05-06 AU AU2010246885A patent/AU2010246885B2/en not_active Ceased
  • 2010-05-06 WO PCT/AT2010/000155 patent/WO2010129978A2/de active Application Filing
  • 2010-05-06 MX MX2011012138A patent/MX2011012138A/es not_active Application Discontinuation
  • 2010-05-06 RU RU2011150511/02A patent/RU2011150511A/ru not_active Application Discontinuation
  • 2010-05-06 US US13/320,170 patent/US20120068528A1/en not_active Abandoned
  • 2010-05-06 EP EP10718034A patent/EP2430288A2/de not_active Withdrawn
  • 2010-05-06 CN CN201080021778.0A patent/CN102421989B/zh not_active Expired - Fee Related
• 2011
  • 2011-10-24 ZA ZA2011/07777A patent/ZA201107777B/en unknown

Patent Citations (6)

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