Cutting tool for mining machine

FIELD: mining machinery building, particularly mining machine structures.

SUBSTANCE: cutting tool has holder including shank and head made as truncated cone. Hard-alloy conical insert having apex and base is installed on end surface of the head. Holder head is provided with cylindrical extension arranged on end surface thereof and coaxial thereto. Hard-alloy insert has cylindrical groove for above cylindrical extension receiving. End surface of holder head is superposed with surface of conical hard-alloy insert base. Conical part of holder head may be enclosed with hard-alloy insert base.

EFFECT: increased operational reliability and reduced hard-alloy consumption for cutting tool production.

3 dwg

 

The invention relates to the field of mining engineering and can be used in the construction of mining machines.

Known cutter for mining machines (author's certificate USSR N1102936, CL E 21 25/38 from 15.07.1984), including mating with the tapered shank of a working cylinder, which is fixed to the insert with a cutting part and a conical surfacing element, and the cross-section of cladding element is designed as two trapezoids, the greater base of which is situated on either side of the cutting insert.

The disadvantage of this cutter is that when the cutter simultaneously with the wear insert is wear and a working head, a that will eventually lead to the violation of the solder paste and its loss.

The closest technical solution adopted for the prototype, is the cutter for mining machines (patent RF N 2079651, E S 35/18 from 20.05.1997)containing a holder comprising a shank and is made in the form of a truncated cone head, on the face of which is equipped with tungsten carbide insert cone shape having a vertex and a base, and the head holder provided with a cylindrical protrusion located coaxially at its end surface, and a carbide insert cone is made with a cylindrical bore in which the cylindrical protrusion of the head holder, with the end surface goal is Cai holder combined with a surface carbide insert cone shape.

The disadvantage of this solution is the wear of the working head with the subsequent loss of the carbide insert, moreover, the disadvantage is the increased consumption of carbide material for the manufacture of the cutter, as the carbide insert is placed inside the working head.

The present invention is to improve the operational reliability of the cutter for mining machines and reducing the consumption of hard alloy material in its manufacture.

The task is solved in that the cutter for mining machines, containing in the tool holder including a shank and is made in the form of a truncated cone head, on the face of which is equipped with tungsten carbide insert cone shape having a vertex and a base, and the head holder provided with a cylindrical protrusion located coaxially at its end surface, and a carbide insert cone is made with a cylindrical bore in which the cylindrical protrusion of the head holder, and thus the face surface of the head holder is combined with a surface carbide insert cone shape, according to the invention, the tapered portion of the head holder is made with the possibility of an overlap basis carbide insert.

This design allows rigidly set carbide insert on the tupe holder, the most economical use of carbide material.

Comparison of the inventive cutter for mining machines with the prototype allows to make a conclusion about the absence in the latter of signs similar to a distinctive signs with the inventive cutter for mining machines: the tapered portion of the head holder is made with the possibility of an overlap of the basis of the carbide insert.

The set of features of the proposed technical solution is different from the prototype and known analogues and should not be explicitly studied the prior art, therefore, is new and involves an inventive step.

The essence of the invention is illustrated the accompanying drawings. In the drawings shows:

Figure 1. - General view of the cutter for mining machines (side view).

Figure 2 - head holder (front view).

Figure 3 - carbide insert cone shape (right side view).

Cutter for mining machines contains (1, 2, 3) the holder 1 includes a shank 2 and is made in the form of a truncated cone head 3, on the end surface 4 which is equipped with carbide insert 5 of the conical shape having the top 6 and the base 7, the head 3 of the holder 1 is provided with a cylindrical lug 8, which is located coaxially on its end surface 4, and a carbide insert 5 cone is made with a cylindrical recess 9 in which the cylindrical protrusion 8 of the head 3 of the holder 1, while the end surface 4 of the head 3 of the holder 1 is combined with the base surface 7 carbide insert 5 cone shape, and the diameter "d1" of the latter exceeds the diameter "d" of the head 3 of the holder 1.

The operation of the cutter for mining machines as follows. During operation of the cutter for mining machines of its carbide insert 5 is embedded in a mountain range while in contact with the breed only the tapered portion of the carbide insert 5 and the tapered portion of the head 3 of the holder 1 is covered with a diameter "d1" case 7 carbide insert 5, thereby preventing the head 3 of the holder 1 and the soldering carbide insert 5 with the head 3 of the holder 1 from wear and tear.

Declared cutter for mining machines can be widely used in mining industry and other sectors of the economy.

The implementation of this technical solution allows soldering at the foundations carbide insert cone shape to make face-to-face end surface of the holder, and by the difference in diameters to protect her and the tapered portion of the head holder from abrasion during operation.

The proposed cutter for mining machines due to the presence of the cylindrical protrusion on the end of the head holder and cylindrical undercut in the carbide insert and the difference of the diameters of the tungsten carbide insert cone shape and the head holding the key allows you to increase the operational reliability of the cutter for mining machines, by increasing the service life of the latter, and also to reduce the consumption of expensive carbide material and significantly reduce the cost of manufacture of the cutter for mining machines.

Cutter for mining machines, containing in the tool holder including a shank and is made in the form of a truncated cone head, on the face of which is equipped with tungsten carbide insert cone shape having a vertex and a base, and the head holder provided with a cylindrical protrusion located coaxially at its end surface, and a carbide insert cone is made with a cylindrical bore in which the cylindrical protrusion of the head holder, and thus the face surface of the head holder is combined with a surface carbide insert cone shape, wherein the tapered portion of the head holder is made with the possibility of an overlap of the basis of the carbide insert.



 

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