BE1000203A4 - Element for mining cup machine. - Google Patents

Abstract

Cutting element for a cutting tool of a mining machine for cutting tender materials, comprising a support pin (10), one end (28) of which is adapted to be positioned in a socket in the cutting tool and of which the other end has a recess (14) in which a composite abrasive compact material (16) is placed, the composite abrasive compact material being bonded to the spindle, the layer of compact abrasive material (18) of the composite abrasive compact material comprising a bevelled edge (22).

Description

       

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  "Cutting element for mining machine"
The present invention relates to cutting elements which can be used in mining machines of the type which Pon uses to cut a series of soft materials, such as coal.



   In mining machines of this type, several cutting tools (also called picks) are positioned on a working surface, for example on the surface of a drum, and brought in a cutting direction against the face of the material to be cut. . Each tool comprises a support tongue and a cutting element fixed in a hole or nesting in the tongue. The cutting element
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 can be made of a wear-resistant material, such as cemented carbide. Or else the cutting element may comprise an elongated spindle, one end of which comprises a compact abrasive material, which constitutes a cutting edge for the cutting.



   According to the present invention, o. n provides a cutting element for a cutting tool of a mining machine of the type described above, comprising a support spindle, one end of which is adapted to be placed in a socket of the cutting tool,
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 a compact abrasive material being bonded to the opposite end, the compact abrasive material having a beveled edge.



   Other details and particularities of the invention will emerge from the description below, given by way of nonlimiting example and with reference to the appended drawings, in which: FIG. 1 illustrates a side view of an embodiment of a cutting element of the invention.



   FIG. 2 illustrates a perspective view of a cutting tool comprising the cutting element of FIG. 1.



   The support pin which carries the compact abrasive material is preferably made of cemented carbide, typically of cemented tungsten carbide.

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   The compact abrasive material will generally be in the form of a disc, which provides a beveled, circular edge.



   The compact abrasive material can be any material known in the art. The abrasive compacts consist essentially of a mass of abrasive particles present in an amount of at least 70%, preferably from 80 to 90% by volume of the compact material bound in a hard conglomerate. Compact materials are polycrystalline masses and can replace large single crystals. The abrasive particles of compact materials are invariably ultra-hard abrasive materials, such as diamond or cubic boron nitride.



   The compacts made up of diamond and cubic boron nitride are produced under temperature and pressure conditions at which the abrasive particle is crystallographically stable. Therefore, the compacts include a considerable amount of direct particle-to-particle bonds.



   The compact abrasive material can be bonded to a cemented carbide support. These bonded compact abrasive materials are known in practice as composite abrasive compact materials. Composite abrasive compacts and their manufacturing process have been described in detail in the patent literature, for example in United States Patent Nos. 3,743,489, 3,767,371,0643 909 and 3. 745. 623.



   The compact abrasive material or the compact abrasive composite material will preferably be arranged in a recess formed in one end of the support pin. The shape of the pin is preferably such that it provides a shoulder surrounding the recess and moving obliquely from it.



   The bonding of the compact abrasive material or of the compact abrasive composite material to the support pin can be carried out by methods well known in the art, for example by soldering.



   An embodiment of the invention will now be described with reference to the accompanying drawing.



   If we refer to figure 1 of this drawing, there are

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 shown a cutting element comprising a support pin 10 made of cemented carbide. The support pin has at one end 12 a recess 14 in which is placed a compact abrasive composite material 16. The compact abrasive composite material comprises a layer of compact abrasive material 18 bonded to a cemented carbide support 20. The cemented carbide support 20 is linked to the support pin by means of a suitable solder. The layer of compact abrasive material 18 has a bevelled cutting edge
22.

   The bevelled edge 22 has the advantage over the sharp edge of the cutting elements of the prior art, that the tendency to burst is reduced to a minimum.



   Moving obliquely from the recess is a shoulder 24 which completely surrounds the latter. the shoulder leads to an enlarged area 26 which in turn leads to a narrower, lower area 28. In use, the support spindle is placed in a socket of a cutting tool for a mining machine of the as illustrated by Ja Figure 2. Referring to this figure, the cutting tool comprises a support leg 30, one end 32 of which is shaped to be fixed in the surface of a drum of a mining machine conventional and the other end 34 of which constitutes a work surface 36. A socket 38 is provided in the work surface 36.

   The support pin 10 is arranged in the tile socket so that the zones 26 and 28 fit completely therein, which accommodates complementary shaped zones. The spindle can be fixed in the socket by soldering.



     It should be understood that the present invention is in no way limited to the above embodiments and that many modifications can be made thereto without departing from the scope of this patent.


    

Claims (5)

 CLAIMS 1. Cutting element for a cutting tool of a mining machine of the type used for cutting tender materials, comprising a support spindle (10), one end (28) of which is adapted to be positioned in a socket of the cutting tool, a compact abrasive material (16) being bonded to the opposite end, the compact abrasive material (16) having a beveled cutting edge (22).  2. Cutting element according to claim 1, characterized in that the compact abrasive material (16) is the layer of compact material of a compact abrasive composite material.  EMI4.1 3. Cutting element according to either of Claims 1 and 2, characterized in that the compact abrasive material or the compact abrasive composite material is placed in a recess (14) formed in one end of the support pin. (iO).  4. Cutting element according to any one of the preceding claims, characterized in that the compact abrasive material (16) is a compact diamond material.  5. Cutting element according to any one of the preceding claims, characterized in that the support pin (10) is made of cemented carbide