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

A technology of aluminum oxide hollow balls and diamond drill bits, which is applied to drill bits, drilling equipment, earthwork drilling and production, etc., to achieve the effects of increased service life, reduced area, and improved drilling efficiency

Inactive Publication Date: 2015-03-04
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • 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

Method used

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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

Examples

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Effect test

Embodiment 1

[0026] Example 1: Taking the manufacturing method of the hot-pressed diamond drill bit added with alumina hollow spheres of the present invention to manufacture a φ77 / 48mm drill bit as an example, the specific process steps are:

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

[0028] (2) The granulating and coating machine adopts a self-developed stepless speed-regulating granulator. The barrel of the granulating and 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 granulating and coating machine to 60r / min.

[0029] (3) Load the alumina ...

Embodiment 2

[0035] Example 2: Using the method for manufacturing a hot-pressed diamond drill bit with alumina hollow spheres of the present invention to manufacture a φ95 / 68 drill bit, the specific process steps are basically the same as those in Example 1, except that: sector cutting work block 1, nozzle 4 There are 10 pieces, the height of the sector-shaped cutting block 1 is 12mm, and the height of the gauge layer 5 of the drill is 9mm. Due to the different specifications of the drill bit and the larger the diameter, the dosage of the drill bit matrix material will be different. Step (5) and step (6) must be different.

[0036] Step (5) Take the matrix powder of the drill bit. The mass ratio of the matrix powder of the drill bit is: iron 36%, nickel powder 12%, YG8 powder 8%, cobalt 3%, copper alloy powder 41%, and weigh it. Ball mill for 8 hours in a ball mill to ensure uniform mixing of various powders. φ95 / 68 size drill bit requires 200g carcass powder for each bit.

[0037] Step (6) M...

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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 method for manufacturing a hot-pressed diamond drill bit added with alumina hollow spheres, which belongs to the field of soil or rock drilling in the field of geological engineering disciplines. Background technique [0002] It has been half a century since my country began to develop synthetic diamond drill bits. The current diamond drill bit has better performance and can obtain higher economic and technical indicators. However, with the development in the direction 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; many times Although a borehole has only ten meters of hard and dense rock, it must take several days or even ten days to drill through this hard and dense rock formation. This situation has seriously affected the progress of the drilling project. [0003] Usually encountered rock is har...

Claims

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Application Information

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Patent Type & Authority Patents(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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