SU605956A1 - Mining machine cutter - Google Patents

Description

(54) CUTTER FOR MOUNTAIN MACHINES

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The invention relates to the mining industry, in particular to the design of the cutting tool and can be used in the executive bodies of coal mining;

Known incisors for mining machines include a symmetric cylindrical holder, ocHamejHHyro. carbide inserts with a conical tip made in the form of a large straight cone from two ends. The disadvantage of such incisors is that the tips often become damaged when they encounter strong inclusions due to weakened near its apex.

Also known are incisors for mining machines containing a cylindrical holder placed in a cam socket, provided with a carbide insert, having a tip in the form of a working cone with a large apex angle and reduced generatrix, and also a transitional truncated cone with a significantly smaller angle 2.

The disadvantage of such incisors is that, due to the reduced forming of the working cone, it is intensively worn and, since the increment is

2

: wear during the wear process due to abrupt transition to; the truncated cone is almost insignificant, wear and tear progresses, which further leads to wear of the head part of the tool holder and loss of the carbide insert, which significantly reduces the efficiency of the destruction of the array.

The aim of the invention is to increase the efficiency of the destruction process and increase the wear resistance of the cutter.

This goal is achieved by the fact that the section of the carbide insert, located between its body and the conical tip, is made convex, while the forming convex surface is in tangency with the generator of the conical tip.

FIG. 1 shows the proposed cutter, a general view;

FIG. 2 - the head part of the cutter.

The cutter consists of a holder 1 with a shank 2, a cylindrical part 3, a conical head 4 and a carbide insert 5, which with its body 6 is located in the socket 7 of the conical head 4.

The carbide insert 5 has a conical tip 8 with apex 9. The area between the body 6 of the insert 5 and its conical tip 8 is concave, while the conical surface forming is conjugated with the convex surface of the convex surface 10 (with arc a-b) and extends beyond the head conical Part 4 of the holder. Due to the fact that the ferrule insert tip has the shape of a cone that transforms into a convex surface before mating with the cylindrical surface of the insert, while maintaining a rational angle of the cone and its minimum formation, the cutter cost increases, the holder protects against rapid wear and efficiency. destruction. The equipment of mining machines with the proposed cutters will allow to obtain an economic effect by increasing the efficiency of destruction, increasing the service life of the tool and preserving the sizes of cutters. Formula Cutter for mining machines, comprising a working head formed by a straight circular truncated cone and equipped with a carbide insert with a cylindrical body and a tapered tip, a holder and shank, characterized in that, in order to increase the efficiency of the fracture process and increase the wear resistance of the tool, a carbide section the insert, located between its body and the conical tip, is made convex, with the forming convex surface matching on the generator of the conical akonechnika. Sources of information taken into account in the examination: 1. Germany patent No. 1280177, cl. 5 V 25/38 ,. 1968. 2. US Patent 3,830,321, cl. 175-332i 1974.

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