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Polycrystalline diamond down-the-hole drill bit and preparation method thereof

A technology of polycrystalline diamond and diamond, which is applied in the direction of drill bits, drilling equipment, earthwork drilling and mining, etc. It can solve problems such as waste of manpower, material resources and raw materials, affecting project quality and progress, and short life of down-the-hole drill bits, so as to achieve enhanced wear resistance performance, improve wear resistance, and improve the efficiency of construction and excavation

Active Publication Date: 2018-11-27
CHINA RAILWAY ENGINEERING EQUIPMENT GROUP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The short life and low efficiency of down-the-hole drills not only affect the quality and progress of the project, but also cause a lot of waste of manpower, material resources and raw materials

Method used

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  • Polycrystalline diamond down-the-hole drill bit and preparation method thereof
  • Polycrystalline diamond down-the-hole drill bit and preparation method thereof

Examples

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Effect test

Embodiment 1

[0032] A polycrystalline diamond down-the-hole bit, comprising a down-the-hole bit base and tooth tips evenly arranged on the outer peripheral surface of the down-the-hole bit base; wherein the mass percentages of the raw materials of the down-the-hole bit base are: C is 0.24%, Ni is 3.1%, Mn is 0.6%, Cr is 1.7%, Mo is 0.2%, V is 0.8%, impurity P≤0.02%, impurity S≤0.02%, Fe balance;

[0033] The tooth tip is composed of a cemented carbide substrate and a polycrystalline diamond wear-resistant layer. The mass percentages of the raw materials of the polycrystalline diamond wear-resistant layer are: 80% for diamond, 7% for Si, and 13% for Co.

[0034] The base body of the down-the-hole drill bit is subjected to surface carburizing treatment, the overall hardness of the surface is HRC57, the hardness of the core is HRC34, and the impact toughness of the core is 40J / cm 2 above.

[0035] A manufacturing process of a polycrystalline diamond down-the-hole drill bit, comprising the fo...

Embodiment 2

[0054] A polycrystalline diamond down-the-hole bit, comprising a down-the-hole bit base and tooth tips evenly arranged on the outer peripheral surface of the down-the-hole bit base; wherein the mass percentages of the raw materials of the down-the-hole bit base are: C is 0.26%, Ni is 3.3%, Mn is 0.7%, Cr is 1.8%, Mo is 0.3%, V is 0.9%, impurity P≤0.02%, impurity S≤0.02%, Fe balance;

[0055] The tooth tip is composed of a hard alloy substrate and a polycrystalline diamond wear-resistant layer. The mass percentages of the raw materials of the polycrystalline diamond wear-resistant layer are: 81% for diamond, 6.5% for Si, and 12.5% ​​for Co.

[0056] The base of the down-the-hole bit is carburized on the surface, the overall hardness of the surface is HRC58, the hardness of the core is HRC36, and the impact toughness of the core is 40J / cm 2 above.

[0057] A manufacturing process of a polycrystalline diamond down-the-hole drill bit, comprising the following steps:

[0058] (1)...

Embodiment 3

[0076] A polycrystalline diamond down-the-hole bit, comprising a down-the-hole bit base and tooth tips evenly arranged on the outer peripheral surface of the down-the-hole bit base; wherein the mass percentages of the raw materials of the down-the-hole bit base are: C is 0.30%, Ni is 3.5%, Mn is 0.8%, Cr is 1.9%, Mo is 0.4%, V is 1.0%, impurity P≤0.02%, impurity S≤0.02%, Fe balance;

[0077] The tooth tip is composed of a cemented carbide substrate and a polycrystalline diamond wear-resistant layer. The mass percentages of the raw materials of the polycrystalline diamond wear-resistant layer are: 82% for diamond, 6% for Si, and 12% for Co.

[0078] The base of the down-the-hole drill bit is subjected to surface carburizing treatment, the overall hardness of the surface is HRC60, the hardness of the core is HRC38, and the impact toughness of the core is 40J / cm 2 above.

[0079] A manufacturing process of a polycrystalline diamond down-the-hole drill bit, comprising the followi...

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Abstract

The invention provides a polycrystalline diamond down-the-hole drill bit and a preparation method thereof, comprising a down-the-hole drill bit matrix and tooth bits uniformly arranged on the outer circumferential surface of the down-the-hole drill bit matrix; The tooth tip is composed of cemented carbide matrix and polycrystalline diamond wear-resistant layer. A manufacture method comprises thatfollow steps of: (1) machining a substrate of a down-hole drill bit, surface carburizing treatment, and machining a tooth tip mount hole on the circumferential surface of the substrate of the down-hole drill bit; 2, proces that cemented carbide matrix into a polycrystalline diamond composite sheet as a tooth tip; (3) the tooth tip is uniformly fixed into the mounting hole of the DTH bit base bodyby the mosaic method. The invention prefabricates mounting holes on the circumferential surface of the head of the down-the-hole drill bit base, Polycrystalline diamond composites are fabricated fromcemented carbide matrix and polycrystalline diamond wear-resistant layer by a series of processing techniques. The wear-resistant layer of polycrystalline diamond greatly enhances the wear-resistanceof DTH bit matrix.

Description

technical field [0001] The invention relates to the technical field of processing and manufacturing of mining tools, in particular to a polycrystalline diamond down-the-hole drill bit and a preparation method thereof. Background technique [0002] At present, down-the-hole drills are widely used in open-pit and underground mines, quarries, hydropower projects, water well drilling, mineral exploration, rock mass steel cable anchor hole drilling, geothermal excavation, subway engineering excavation, side pile support and other construction sites. use. In traditional technology, the down-the-hole drill bit consists of a carbide tooth head and a steel substrate. Traditional down-the-hole drill tools can meet engineering needs in medium-hard and soft rock formations, but when encountering hard granite or abrasive rock formations, the carbide tooth head of the down-the-hole drill is severely worn or hard alloy The tooth head falls off and breaks prematurely. The short life and ...

Claims

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Application Information

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IPC IPC(8): E21B10/46C22C38/04C22C38/44C22C38/46C21D1/18C21D9/22C22C26/00C22C29/08
CPCC21D1/18C21D9/22C22C26/00C22C29/08C22C38/04C22C38/44C22C38/46E21B10/46
Inventor 于庆增喻中孝杨洋
Owner CHINA RAILWAY ENGINEERING EQUIPMENT GROUP CO LTD