Shield cutter for complex geology

A technology of complex geology and shield knives, which is applied to other manufacturing equipment/tools, engine components, mechanical equipment, etc., can solve problems such as extrusion, impact, and scraping of shield knives, and achieve the effect of increasing service life

Inactive Publication Date: 2015-02-18
ZHEJIANG HENGCHENG CEMENTED CARBIDE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide shield knives for complex geology, which can effectively solve the problem that the existing shield knives cannot meet the continuous and changing effects of extrusion, impact, scraping, etc. from underground soil quality and water pressure.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] The shield knife for complex geology includes the following components by weight ratio: Co powder with a purity of 99.9%: 14.5%, Re: 0.5%, 3-5μm WC powder: 11%, 8-13μm WC powder: 22%, The rest is 5-8μm WC powder.

Embodiment 2

[0012] The shield knife for complex geology includes the following components by weight ratio: Co powder with a purity of 99.9%: 15%, Re: 0.1%, 3-5μm WC powder: 15%, 8-13μm WC powder: 20%, The rest is 5-8μm WC powder.

Embodiment 3

[0014] The shield knife for complex geology includes the following components by weight ratio: Co powder with a purity of 99.9%: 14.8, Re: 0.2%, 3-5μm WC powder: 13%, 8-13μm WC powder: 21%, and the rest 5-8μm WC powder.

[0015] The wet grinding and feeding are mixed evenly in stages, the oil pan is dried at high temperature and wax is added, and the cold isostatic pressing machine is used to produce various types of protective knife blanks for shield tunneling. The hot isostatic pressing is integrated and sintered, and the bending resistance is greater than 3000N. / mm 2 , Hardness HRA85, a large proportion of medium-grain primary WC, a medium proportion of coarse grain, and a small proportion of finer medium-grain primary WC to produce a high-toughness and high-wear resistance alloy that can well adapt to the ultra-complex geological conditions in China and reduce Shield cutting tool failure rate improves shield efficiency.

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Abstract

The invention discloses a shield cutter for complex geology. The shield cutter comprises the following components in percentage by weight: 14.5 to 15 percent of Co powder with the purity of 99.9 percent, 0.1 to 0.5 percent of Re, 11 to 15 percent of WC (Wolfram Carbide) powder with the granularity of 3 to 5 microns, 20 to 22 percent of WC powder with the granularity of 8 to 13 microns, and the balance of WC powder with the granularity of 5 to 8 microns. The complex geological shield cutter has the advantages that a high-toughness and high-wear resistance alloy produced by mixing medium particle primary WC with large proportion, crude particles with medium proportion and relatively thin medium particle primary WC with small proportion can well adapt to ultra-complex geological conditions in China, the fail rate of the shield cutter is reduced, the shield efficiency is improved, the bending resistance is greater than 3,000N / mm<2>, and the hardness is HRA85.

Description

technical field [0001] The invention relates to a shield cutter for complicated geology. Background technique [0002] The existing shield knives are all made of tungsten-cobalt alloys, which cannot satisfy the shield knives to withstand the continuous and changing effects of extrusion, impact, scraping, etc. from underground soil quality and water pressure. Contents of the invention [0003] The purpose of the present invention is to provide a shield cutter for complex geology, which can effectively solve the problem that the existing shield cutter cannot meet the continuous and changing extrusion, impact, scraping and other effects of the shield cutter from underground soil quality and water pressure. [0004] In order to solve the above-mentioned technical problems, the present invention is achieved through the following technical proposals: a shield cutter for complex geology, comprising the following components by weight ratio: Co powder with a purity of 99.9%: 14.5% ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00B22F5/00C22C29/08
Inventor 郭伟波杨雪金益民吴晓娜
Owner ZHEJIANG HENGCHENG CEMENTED CARBIDE
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