Fabrication method for hot pressing diamond bit with added aluminium oxide hollow balls

An alumina hollow ball and diamond drill bit technology is applied in drill bits, drilling equipment, earth-moving drilling and other directions to achieve the effects of increasing the drilling pressure, improving the effect of cutting edge and improving the coefficient of friction.

Inactive Publication Date: 2013-04-03
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the technical problems existing in the existing drill bits, and to provide a method for manufacturing hot-pressed diamond drill bits by adding aluminum oxide hollow spheres, and to make the drill bits produced by this method hard to hard and compact when drilling. High drilling efficiency in rocks and long service life, thus meeting the urgent needs of the geological engineering disciplines

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  • Fabrication method for hot pressing diamond bit with added aluminium oxide hollow balls
  • Fabrication method for hot pressing diamond bit with added aluminium oxide hollow balls

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Embodiment 1

[0026] Embodiment 1: Take the manufacturing method of the hot-pressed diamond drill bit adding aluminum oxide hollow balls of the present invention as an example to manufacture the φ77 / 48mm specification drill bit, and the specific process steps are:

[0027] (1) Prepare the material for alumina hollow sphere granulation and film coating: select alumina hollow spheres with a diameter of 1 to 3mm, and the film coating material is copper-iron-graphite mixed powder, and the copper-iron-graphite mixed powder is based on mass The ratio is: copper 45%, iron 35%, graphite 20%; the adhesive is triethanolamine.

[0028] (2) The granulation film coating machine adopts the self-developed stepless speed regulation granulator. The barrel of the granulation film coating machine is drum-shaped, the maximum diameter of the barrel is 350mm, and the height is 200mm. The central axis of the barrel and the horizontal angle Adjust to 45°, and adjust the speed of the granulator to 60r / min.

[0029...

Embodiment 2

[0035]Embodiment 2: Adopt the manufacturing method of the hot-pressed diamond drill bit that adds aluminum oxide hollow ball of the present invention to manufacture φ95 / 68 specification drill bit, each step of specific process is basically the same as embodiment 1, difference is: fan-shaped cutting working block 1, nozzle 4 There are 10 pieces, the height of the fan-shaped cutting work block 1 is 12mm, and the height of the gauge layer 5 of the drill bit is 9mm. As the specifications of the drill bits are different and the caliber becomes larger, the amount of the matrix material of the drill bit is different accordingly, so step (5) and step (6) must be different.

[0036] Step (5) Take the matrix powder of the drill bit. The matrix powder of the drill bit is: iron 36%, nickel powder 12%, YG8 powder 8%, cobalt 3%, copper alloy powder 41%. Mill in a ball mill for 8 hours to ensure that all kinds of powders are mixed and ground evenly. φ95 / 68 specification drill bits require 2...

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Abstract

The invention relates to a fabrication method for a hot pressing diamond bit with added aluminium oxide hollow balls. The method comprises the following processes: allowing the aluminium oxide hollow balls and the diamonds to be subjected to pelletization and film applying; uniformly mixing the film applied aluminium oxide hollow balls, the diamonds and bit matrix powder subjected to ball milling and an adhesive; weighing the mixture and filling into a graphite die according to the required amount of each of drill bits in various specifications; pressing a drill bit steel basal body on the graphite die which is then delivered into an mid-frequency electric furnace and pressing machine all-in-one machine for sintering, wherein the hot pressing pressure is 15-16 MPa, the boiler temperature is 950-960 DEG C, the heat-insulating time is 4-5 min, and the discharging temperature is 815-830 DEG C; and after discharging, slowly cooling to the ambient temperature under the heat-insulating condition, and carrying out demoulding so as to fabricate the drill bit provided by the invention. According to the invention, the diamond volume concentration of the diamonds in a fan-shaped cutting operating block of the drill bit is 11-13 percent, and the volume concentration of the aluminium oxide hollow balls is 12-18 percent. The drill bit is used for drilling objects that are as hard as that of hard and compact rocks; and average drilling effectiveness is improved by 95 percent, and the service life is improved by 80 percent as compared with a general diamond bit.

Description

technical field [0001] The invention relates to a manufacturing method of a hot-pressed diamond drill bit added with aluminum oxide hollow balls, which belongs to the field of soil layer or rock drilling in the field of geological engineering. Background technique [0002] It has been half a century since my country began to develop artificial diamond drill bits. The current diamond drill bit has better performance and can obtain higher economic and technical indicators. However, with the development of deep prospecting, the rock formations become harder and denser, and the drilling speed becomes very low, generally below 0.5m / h, and sometimes it takes 3 hours to drill one meter; Although a drill hole is only ten meters of hard and dense rock, it must take several days or even more than ten days to drill through this hard and dense rock formation. This situation has seriously affected the progress of the drilling project. [0003] Usually encountering hard and dense rock, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B10/46
Inventor 杨展朱恒银王强杨凯华
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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