Welding-free cutting bit

Abstract

The invention provides a welding-free cutting bit which relates to a mining tool, in particular to a cutting bit used in the excavating, driving and crushing of mines, roads and the like. The cutting bit comprises a cutting bit body and a hard alloy head fixed on the head of the cutting bit body, wherein the working part of the hard alloy head is a cone, and the angle of cone is 60-130 degrees. The cutting bit is characterized in that the mounting-pressing part of the hard alloy head is a cone, the angle of cone is 1.0-5.6 degrees; the mounting hole on the head of the cutting bit body is a tapered hole with the same shape of the mounting-pressing part of the hard alloy head, and all the surfaces of the mounting hole closely stick to all the surfaces of the mounting-pressing part of the hard alloy head. The invention has the advantage that the firm joint of the cutting bit body and the hard alloy head can be ensured, the impact resistance and twisting resistance of the cutting bit can be ensured in use and the traditional welding technology can be avoided so as to thoroughly eliminate various defects of primitive welding.

Description

technical field [0001] The invention relates to a mining tool, more precisely a pick used for mining, driving and crushing in mines and roads. Background technique [0002] The pick is composed of a pick body and a hard alloy head fixed on the head of the pick body. There are three kinds of existing pick structures: the first structure is widely sold in the market at present, the working part of the hard alloy head is a cone, the cone angle is 60-130°, and the matching part of the hard alloy head and the pick body is Cylinder, the cemented carbide head is fixed in the installation hole of the head of the pick body by welding; the second structure is like the patent "a shearer pick fixing device", etc., the working part of the cemented carbide head is a cone body, the taper angle is 60-130°, the matching part between the hard alloy head and the pick body is a cylinder, and the installation part of the hard alloy head is fixed in the installation hole of the pick body head by...

AI Technical Summary

Problems solved by technology

The defects of the above-mentioned first structure are: 1. The solder needs to be heated to above 950°C for welding to fully melt, which consumes a lot of power and wastes energy, which does not meet the requirements of "saving economy"; 2. The solder used in welding The solder flux is expensive and the cost is high, and the welding has a high requirement on the chemical composition of the solder flux. Unqualified solder flux or wrong operation can easily cause desoldering, air bubbles and other welding scraps; 3. During the welding process, After borax is subjected to high temperature, more dust and smoke will be produced, which is not conducive to the health of operators and does not meet the requirements of an "environmentally friendly society"; 4. The welding process is slow, which is not conducive to mass production of products; 5. , In the later use process, once the welding is removed, the cemented carbide head will fall off from the pick body, and the entire pick will be completely invalid and no longer have use value; 6. After welding, it is difficult for the carbide In this way, it is difficult to reuse the expensive hard alloy heads in the scrapped picks, which seriously wastes rare mineral resources.

The disadvantage of the second structure is: in the actual application process, the fixing effect is not ideal, and it is easy to lose the teeth

The defects of the third structure are: 1. During the forging process, the taper of 1:20 to 1:5 is easy to generate pulling stress at the root of the pick body hole, and in severe cases, tearing will occur, resulting in cracking of the pick body after quenching ;2. During the forging process, an excessively large angle will lead to greater extrusion force, which will easily cause the carbide head to break away from the bottom plane of the head hole of the pick body. Once the carbide head is suspended, it will no longer be guaranteed The expected strength during subsequent use

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