Hard alloy drill plate and drill bit

Abstract

The present invention relates to hard alloy brazing plate and bore bit. The brazing plate has a brazing plate body and locating fins in the same height on two sides of the body to ensure the brazing plate body fixed in the center of the slot for homogeneous brazing seam, high brazing seam strength, the homogeneous elimination of the high temperature stress of the hard alloy brazing plate during the brazing, stable performance, homogeneous strength and no cracking. Or, the brazing plate has symmetrical inward notches on two sides to raise the raise the radial shock resistance and wear resistance of the brazing plate and ensure the homogeneous radial wear. The bore bit with the hard alloy brazing plate embedded in the fixing slot has high product quality, and long service life of driving length up to 800-900.

Description

technical field [0001] The invention belongs to mining drilling tools, in particular to a cemented carbide drill piece and drill bit. Background technique [0002] At present, the production of most cemented carbide brazing chips follows the Soviet Union's technology in the early 1950s. This technology is to fix the cemented carbide brazing sheet embedded on the trouser body of the drill bit to the trouser body by high-temperature brazing. With the improvement of new products, new technologies, new equipment and mine benefits, the requirements for cemented carbide brazing chips are also getting higher and higher. The drill bits produced according to the prior art have the following problems: the one is that it is difficult to ensure that the drill bit is accurately positioned in the center of the groove during the brazing process, and often the welding seam is asymmetrical and the two sides are not equal. Cemented carbide brazing chips often form a large internal stress af...

AI Technical Summary

Problems solved by technology

The drill bits produced according to the prior art have the following problems: the one is that it is difficult to ensure that the drill bit is accurately positioned in the center of the groove during the brazing process, and often the welding seam is asymmetrical and the two sides are not equal. Cemented carbide brazing chips often form a large internal stress after high-temperature brazing. This asymmetric and uneven weld will inevitably lead to uneven internal stress of the brazing chip, and at the same time, the uneven and asymmetric weld has a great impact on the alloy braze. The compressive stress of the chip will also be asymmetrical and uneven. In severe cases, the chip will even crack when the drill bit is not in use. Once it is used, it will cause fragments and lead to early scrapping of the product; At the same time, the two ends of the brazing piece are more likely to wear than the central part in the radial direction, that is to say, there is uneven wear of the brazing piece in the radial direction, and often the brazing piece is desoldered, resulting in early scrapping of the brazing piece. increase production cost

It affects both production efficiency and benefits in mining, and causes a lot of waste of my country's strategic tungsten resources

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