Cutting device for a mining machine

Abstract

In a cutting device for a mining machine, in particular a shearer, including a tool carrier, in particular a shearer drum, that is rotatably mounted about a rotational axis and at least one cutting tool ( 1 ) that is fixed to the tool carrier, the cutting tool ( 1 ) comprises a tool base body ( 3 ) and a cutting insert ( 1 ) made of a diamond composite material or a harder material and fixed in a receiving bore ( 6 ) of the tool base body. The cutting tool is oriented on the tool carrier at an incident cutting angle (β) of 45-58°, preferably 47-54°, preferably 49°. The tip ( 2 ) of the cutting insert ( 1 ) is substantially conically designed, with the nose angle being 60-75°.

1 . A cutting device for a mining machine, in particular a shearer, including a tool carrier, in particular a shearer drum, that is rotatably mounted about a rotational axis and at least one cutting tool that is fixed to the tool carrier and comprises a tool base body and a cutting insert made of a diamond composite material or a harder material and fixed in a receiving bore of the tool base body, characterized in that the cutting tool is oriented on the tool carrier at an incident cutting angle (β) of 45-58° and the tip ( 2 ) of the cutting insert ( 1 ) is substantially conically designed, with the nose angle being 60-75°. 
     
     
         2 . A cutting device according to  claim 1 , characterized in that the tip ( 2 ) of the cutting insert ( 1 ) has a tip radius of 2-5 mm. 
     
     
         3 . A cutting device according to  claim 1 , characterized in that the cutting insert ( 1 ) comprises a cylindrical base body ( 3 ) having a diameter of preferably 10-18 mm and carrying the conical tip ( 2 ), wherein a transition radius of 35-45 mm is provided between the cylindrical base body ( 3 ) and the conical tip ( 2 ). 
     
     
         4 . A cutting device according to  claim 1 , characterized in that the diameters of the cutting insert ( 1 ) and the receiving bore ( 6 ) are dimensioned such that the cutting insert ( 1 ) is held in the receiving bore ( 6 ) by a shrink-press fit. 
     
     
         5 . A cutting device according to any one of  claim 1 , characterized in that the cutting insert ( 1 ) is held in the receiving bore ( 6 ) by the aid of a soldered joint, preferably by using a solder, preferably a metal solder, introduced into the receiving bore ( 6 ). 
     
     
         6 . A cutting device according to  claim 5 , characterized in that the cutting insert ( 1 ) comprises an electrolytic copper coating whose thickness is preferably between 0.1 and 0.2 mm. 
     
     
         7 . A cutting device according to  claim 6 , characterized in that a copper-silver solder is chosen as said solder. 
     
     
         8 . A cutting device according to any one of  claim 1 , characterized in that the diamond composite material is comprised of diamond crystals that are interconnected by a silicon carbide matrix. 
     
     
         9 . A cutting device according to  claim 1 , wherein the incident cutting angle (β) is 47-54°. 
     
     
         10 . A cutting device according to  claim 1 , wherein in the incident cutting angle (β) is 49°. 
     
     
         11 . A cutting device according to  claim 2 , when the tip ( 2 ) of the cutting insert ( 1 ) has a tip radius of 4 mm. 
     
     
         12 . A cutting device according to  claim 3 , wherein the transition radius is 40 mm.