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Material for high-performance TBM cutter disc residue scraping plate and preparation method thereof

A slag scraper and high-performance technology, applied in the field of high-performance TBM cutter head slag scraper materials and their preparation, can solve problems such as equipment life, uneven quality, and slag scraper wear that affect construction efficiency, and achieve good Effects of impact toughness, hardenability improvement, and temper brittleness reduction

Active Publication Date: 2019-02-15
中铁工程装备集团隧道设备制造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the broken rock slices cannot be scraped up by the slag scraper and discharged to the slag outlet in time, it will cause secondary impact and wear on the cutter head and the cutter, and accelerate its failure. The performance of the slag scraper directly affects the construction efficiency and the life of the equipment
[0003] At present, the slag scraper is mostly made of EN-41 steel. Although EN-41 steel has wear resistance, the price is relatively high; Imitation, the quality is uneven, under harsh service conditions, the problem of severe wear of the slag scraper often occurs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] A high-performance TBM cutter head scraper material, expressed in weight percent, the chemical composition of the high-performance TBM cutter head scraper material is as follows: C is 0.39%, Si is 0.94%, Mn is 1.15%, Cr is 1.94%, Mo is 0.70%, the total content of P and S is ≤0.04%, and the balance is Fe.

[0040] The preparation method of the material for the above-mentioned high-performance TBM cutter head slag scraping board comprises the following steps:

[0041] Step 1: Calculate the ratio of raw materials according to the weight percentage of the chemical components of the above-mentioned materials for the TBM cutter head and slag scraper; prepare pig iron, ferrochrome, ferromanganese and ferromolybdenum.

[0042] Step 2: Melting and casting:

[0043] 2a: Add fluorite, silicon-calcium alloy, pig iron and alloy raw materials (alloy raw materials are 20 steel and 20CrMo steel) into the intermediate frequency furnace, and heat until all the raw materials in the inter...

Embodiment 2

[0062] A high-performance TBM cutterhead scraper material, expressed in weight percent, the chemical composition of the high-performance TBM cutterhead scraper material is as follows: C is 0.42%, Si is 0.92%, Mn is 1.10%, Cr is 2.10%, Mo is 0.86%, the total content of P and S is ≤0.04%, and the balance is Fe.

[0063] The preparation method of the material for the above-mentioned high-performance TBM cutterhead slag scraping board comprises the following steps:

[0064] Step 1: Calculate the ratio of raw materials according to the weight percentage of the chemical components of the above-mentioned materials for the TBM cutter head and slag scraper; prepare pig iron, ferrochrome, ferromanganese and ferromolybdenum.

[0065] Step 2: Melting and casting:

[0066] 2a: Add fluorite, silicon-calcium alloy, pig iron and alloy raw materials (alloy raw materials are 20CrMo, 20 steel and 45 steel) into the intermediate frequency furnace, and heat until all the raw materials in the inte...

Embodiment 3

[0085] A high-performance TBM cutterhead scraper material, expressed in weight percent, the chemical composition of the high-performance TBM cutterhead scraper material is as follows: C is 0.45%, Si is 1.05%, Mn is 1.23%, Cr is 2.28%, Mo is 0.75%, the total content of P and S is ≤0.04%, and the balance is Fe.

[0086] The preparation method of the material for the above-mentioned high-performance TBM cutterhead slag scraping board comprises the following steps:

[0087] Step 1: Calculate the ratio of raw materials according to the weight percentage of the chemical components of the above-mentioned materials for the TBM cutter head and slag scraper; prepare pig iron, ferrochrome, ferromanganese and ferromolybdenum.

[0088] Step 2: Melting and casting:

[0089] 2a: Add fluorite, silicon-calcium alloy, pig iron and alloy raw materials (alloy raw materials are 20 steel and 20CrMo steel) into the intermediate frequency furnace, and heat until all the raw materials in the intermed...

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PUM

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Abstract

The invention discloses material for a high-performance TBM cutter disc residue scraping plate and a preparation method thereof. The material comprises the chemical components of, by weight, 0.35%-0.45% of C, 0.80%-1.20% of Si, 1.10%-1.30% of Mn, 1.80%-2.45% of Cr, 0.70%-1.0% of Mo, 0-0.04% of S and P, and the balance Fe. The material hardness is improved significantly, a TBM cutter disc residue scraping plate prepared from the material through smelting-casting-annealing-quenching-tempering steps is good in toughness and high in hardness and has good abrasion resistance, service life of the TBM cutter disc residue scraping plate is prolonged, and the replacement deadline is prolonged.

Description

technical field [0001] The invention belongs to the technical field of TBM components, and in particular relates to a material for a high-performance TBM cutterhead slag scraper and a preparation method thereof. Background technique [0002] Due to the advantages of high excavation efficiency, good safety, economy and environmental protection, and low labor intensity, shield machines are increasingly used in underground projects such as tunnels, pipe networks, and integrated pipe galleries. During construction, the front cutterhead of the shield machine Under the action of the propulsive force of the hob, the disc-shaped hob arranged on the cutter head presses the rock face tightly, and with the rotation of the cutter head, the rock face is rolled out into a series of concentric circles. When the force exceeds the rock strength limit, the concentric circles The cracks in the rocks run through, and the rock flakes peel off. If the broken rock slices cannot be scraped up by t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/22C22C33/06C21D1/26C21D1/18C21C7/06C21C7/064C21C7/068B08B1/00
CPCC21C7/06C21C7/064C21C7/068C21D1/18C21D1/26C21D8/005C22C33/06C22C38/02C22C38/04C22C38/22B08B1/165Y02P10/20
Inventor 魏金李胜永郭浩杨爱军李英发
Owner 中铁工程装备集团隧道设备制造有限公司
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