Preparation method of diamond bits and sintering device thereof

Abstract

The invention discloses a preparation method and a sintering device of diamond bits. The preparation method comprises batching and filling die, hot pressed sintering, heat preservation and receding die, and sequential processing procedures, wherein the hot pressed sintering procedure uses changeable medium frequency sintering, two-way vibration pressure and two-track temperature and pressure curve control. The sintering device is composed of a hot press, a medium frequency power supply and a control system, the control system detects sintering temperature in real time through an infrared thermometer, and adjusts electric current and working efficiency of the medium frequency power supply through a controller, and meanwhile detects hydro-cylinder pressure in real time through a pressure sensor, and the control system is made to operate according to setting temperature and pressure curve of the system. The preparation method and the sintering device of the diamond bits has the advantages of being simple in process, high in degree of automation by using full numerical control, small in graphite dies for sintering, and energy-saving and cost-reducing. By using the preparation method and the sintering device of the diamond bits to manufacture impregnated diamond bits, average manufacturing time of bits is shortened by 40%, power consumption is reduced by 36%, and service life is prolonged by more than 40%.

Description

technical field [0001] The invention belongs to a method for preparing a drill bit and a sintering device thereof, in particular to a method for preparing a diamond-impregnated drill bit and a sintering device thereof. Background technique [0002] Impregnated diamond drill bit is an essential tool for geological exploration, and there is a large demand for engineering. At present, the main method of producing diamond-impregnated drill bits in China is the powder metallurgy method, and the main process links include four steps: namely: batching and molding, cold pressing, heating and sintering and post-processing, among which "cold pressing" and "heating The two process links of "sintering" are carried out by independent hydraulic equipment and medium frequency induction heating equipment, and manual operation runs through the whole process. [0003] The existing diamond bit manufacturing process has the following three disadvantages: one is that in the bit press-sintering ...

AI Technical Summary

Problems solved by technology

[0003] The existing diamond bit manufacturing process has the following three deficiencies: First, in the bit pressing and sintering manufacturing process, cold pressing and heating sintering are carried out separately, and the process is complicated and the cycle is long

The second is that the cold pressing is one-way rigid molding, the pressure is fixed, the internal pressure gradient of the bit matrix is ​​large, and the increase in the density of the bit matrix is ​​limited and uneven.

The third is that heating and sintering is simple medium-frequency induction heating, and the frequency is fixed and cannot be adjusted. It cannot meet the sintering temperature requirements of different metal powders in the formula material at the same time. The diamond graphitization phenomenon cannot be controlled, resulting in limitations in the sintering strength and quality of the drill matrix.

The method adopts a hot pressing process, which reduces the operating procedures and preparation time, and reduces the operating intensity. However, since the hot pressing process is a one-way rigid pressure, there is a pressure gradient in the prepared powder, and the density of different parts of the carcass is not uniform. Manufacturing The degree of consolidation and the service life of the drill bit matrix are also extremely limited

[0006] In order to improve the production efficiency and product quality of diamond drill bits, the applicant once tried to improve the quality of drill bit products by increasing the pressure of cold pressing and improving the temperature control and precision of sintering equipment. There are deficiencies such as extended production cycle, increased manual operation procedures, unstable product quality, etc., and the overall effect is not ideal

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