RU2263212C1 - Cutting tool for mining machine - Google Patents

Abstract

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

Description

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

Known cutter for mining machines (USSR author's certificate N1102936, class E 21 С 25/38 of 07/15/1984), including a conical working head mated to a holder, on which an insert with a cutting part and a conical surfacing element are fixed, and the cross-section of the surfacing element is made in the form of two trapezoid, the larger base of which is located on the side of the cutting part of the insert.

The disadvantage of such a cutter is that when the cutter is working at the same time as the insert is worn, the wear of the working head also occurs, and this ultimately leads to a violation of the soldering of the insert and its loss.

The closest technical solution adopted for the prototype is a cutter for mining machines (RF patent N 2079651, Е 21С 35/18 dated 05/20/1997), containing a holder, including a shank and made in the form of a truncated cone head, on the end surface of which is carbide a cone-shaped insert having a top and a base, and the holder head is provided with a cylindrical protrusion located coaxially on its end surface, and the cone-shaped carbide insert is made with a cylindrical recess in which the cylinder is placed nonstoichiometric projection head holder, wherein the end surface of the head holder is aligned with the base surface forms a carbide insert cone.

The disadvantage of this solution is the wear of the working head with the subsequent loss of the carbide insert, in addition, the disadvantage is the increased consumption of carbide material for the manufacture of the cutter, since the carbide insert is located inside the working head.

The objective of the present invention is to increase the operational reliability of the cutter for mining machines and reduce the consumption of carbide material in its manufacture.

The problem is solved in that in a cutter for mining machines containing a holder including a shank and a head made in the form of a truncated cone, on the end surface of which there is a tungsten carbide insert having a top and a base, the head of the holder having a cylindrical protrusion located coaxially on it end surface, and the tungsten carbide insert is made with a cylindrical recess in which the cylindrical protrusion of the holder head is placed, while the end surface of the head of the holder avki aligned with the surface of the base of the carbide insert of a conical shape, according to the invention, the conical part of the head of the holder is made with the possibility of its overlapping the base of the carbide insert.

This design allows you to rigidly install the carbide insert on the protrusion of the holder, thereby economical use of carbide material.

A comparison of the inventive cutter for mining machines with the prototype allows us to conclude that the latter lacks features similar to the significant distinguishing features of the claimed cutter for mining machines: the conical part of the head of the holder is made with the possibility of its overlapping with the base of the carbide insert.

The set of features of the proposed technical solution has a difference from the prototype and known analogues and does not follow explicitly from the studied prior art, therefore, is new and has an inventive step.

The essence of the invention is illustrated by the accompanying drawings. The drawings show:

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

Figure 2 - head holder (front view).

Figure 3 - tungsten carbide insert (right side view).

The cutter for mining machines contains (Fig. 1, 2, 3) a holder 1, including a shank 2 and a head 3 made in the form of a truncated cone, on the end surface 4 of which there is a carbide insert 5 of a conical shape having a vertex 6 and a base 7, head 3 The holder 1 is provided with a cylindrical protrusion 8 located coaxially on its end surface 4, and the tungsten carbide insert 5 is made with a cylindrical recess 9, in which a cylindrical protrusion 8 of the head 3 of the holder 1 is placed, while the end surface 4 of the head 3 of the holder 1 s is aligned with the surface of the base 7 of the carbide insert 5 of a conical shape, and the diameter "d1" of the latter exceeds the diameter "d" of the head 3 of the holder 1.

The work of the cutter for mining machines is as follows. During operation, the cutter for mining machines with its carbide insert 5 is introduced into the massif, while in contact with the rock only the conical part of the carbide insert 5 and the conical part of the head 3 of the holder 1 are overlapped by the diameter "d1" of the base 7 of the carbide insert 5, thereby protecting the head 3 of the holder 1 and the place of soldering carbide insert 5 with the head 3 of the holder 1 from wear.

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

The implementation of this technical solution allows the soldering at the base of the tungsten carbide insert to be made along the edge of the end surface of the holder, and due to the difference in diameters to protect it and the conical part of the head of the holder from abrasion during operation.

The proposed cutter for mining machines due to the presence of a cylindrical protrusion on the end part of the head of the holder and a cylindrical undercut in the carbide insert and the difference in the diameters of the carbide insert of the conical shape and the head of the holder allows 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 manufacturing a cutter for mining machines.

Claims (1)

A cutter for mining machines, comprising a holder including a shank and a truncated cone-shaped head, on the end surface of which there is a conical shaped carbide insert having a top and a base, the holder head having a cylindrical protrusion located coaxially on its end surface, and a carbide insert the conical shape is made with a cylindrical recess in which the cylindrical protrusion of the holder head is placed, while the end surface of the holder head is aligned with the surface Tew base cemented carbide inserts taper shape, characterized in that the conical portion of the head holder is adapted to overlap its base cemented carbide insert.

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