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High-strength TBM center cutter box and preparation method

A high-strength, center-knife technology, applied in mining equipment, earthwork drilling, manufacturing tools, etc., can solve problems such as cracking, easy crushing, and low strength of the tool box, and achieve the goal of increasing strength, improving strength, and improving mechanical properties. Effect

Active Publication Date: 2020-05-08
CHINA RAILWAY ENGINEERING EQUIPMENT GROUP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The invention proposes a high-strength TBM center knife box and its preparation method, which solves the problems of low strength, easy crushing and cracking of the knife box at present

Method used

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  • High-strength TBM center cutter box and preparation method
  • High-strength TBM center cutter box and preparation method
  • High-strength TBM center cutter box and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A high-strength TBM center knife box includes an outer knife box 101 and an inner knife box 102. The outer knife box 101 is made of low-alloy structural steel, and the inner knife box 102 is made of low-carbon medium-alloy structural steel.

[0032] The low-alloy structural steel material used in the outer knife box 101 includes the following components in weight percentage: C: 0.11%, Si: 0.2%, Mn: 0.38%, V: 0.07%, S: ≤0.02%, P: ≤ 0.02%, the balance is iron.

[0033] The low-carbon medium-alloy structural steel material used in the inner knife box 102 includes the following components in weight percentage: C: 0.11%, Si: 0.2%, Mn: 0.38%, Cr: 1.45%, Ni: 4.5%, W: 0.9%, V: 0.08%, Ti: 0.03%, Nb: 0.01%, S: ≤0.02%, P: ≤0.02%, and the balance is iron.

[0034] The preparation method of described high-strength TBM center cutter box, the steps are as follows:

[0035] (a) Forging the outer knife box 101 and the inner knife box 102;

[0036] (b) Stress-relief annealing treatmen...

Embodiment 2

[0043] A high-strength TBM center knife box includes an outer knife box 101 and an inner knife box 102. The outer knife box 101 is made of low-alloy structural steel, and the inner knife box 102 is made of low-carbon medium-alloy structural steel.

[0044] The low-alloy structural steel material used in the outer knife box 101 includes the following components in weight percentage: C: 0.14%, Si: 0.3%, Mn: 0.40%, V: 0.09%, S: ≤0.02%, P: ≤ 0.02%, the balance is iron.

[0045] The low-carbon medium-alloy structural steel material used in the inner knife box 102 includes the following components in weight percentage: C: 0.13%, Si: 0.3%, Mn: 0.42%, Cr: 1.50%, Ni: 4.8%, W: 1.2%, V: 0.09%, Ti: 0.04%, Nb: 0.015%, S: ≤0.02%, P: ≤0.02%, and the balance is iron.

[0046] The preparation method of described high-strength TBM center cutter box, the steps are as follows:

[0047] (a) Forging the outer knife box 101 and the inner knife box 102;

[0048] (b) Stress-relief annealing treatme...

Embodiment 3

[0055] A high-strength TBM center knife box includes an outer knife box 101 and an inner knife box 102. The outer knife box 101 is made of low-alloy structural steel, and the inner knife box 102 is made of low-carbon medium-alloy structural steel.

[0056] The low-alloy structural steel material used in the outer knife box 101 includes the following components in weight percentage: C: 0.16%, Si: 0.4%, Mn: 0.45%, V: 0.10%, S: ≤0.02%, P: ≤ 0.02%, the balance is iron.

[0057] The low-carbon medium-alloy structural steel material used in the inner knife box 102 includes the following components in weight percentage: C: 0.16%, Si: 0.35%, Mn: 0.42%, Cr: 1.55%, Ni: 5.0%, W: 1.2%, V: 0.09%, Ti: 0.05%, Nb: 0.02%, S: ≤0.02%, P: ≤0.02%, and the balance is iron.

[0058] The preparation method of described high-strength TBM center cutter box, the steps are as follows:

[0059] (a) Forging the outer knife box 101 and the inner knife box 102;

[0060] (b) Stress-relief annealing treatme...

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Abstract

The invention provides a high-strength TBM center cutter box and a preparation method. The center cutter box comprises an outer cutter box and an inner cutter box, wherein the outer cutter box is madeof a structural steel material; the inner cutter box is made of a low-carbon medium-alloy structural steel material; and the inner cutter box and the outer cutter box are combined through welding. The center cutter box provided by the invention has the beneficial effects that the inner cutter box is treated with tempering and hardening, connection is realized in a firm of welding of the inner andouter cutter boxes, the inner and outer cutter boxes are formed by a forging technology, and the inner cutter box is made of low-carbon medium-alloy structural steel, so welding stress centralization, cracking and deformation of the inner and outer cutter boxes are reduced; through surface hardening of the inner cutter box, strength and fatigue performance of bearing parts can be enhanced; and through de-stress annealing of the inner and outer cutter boxes, distribution of residual stress during forging formation and welding stress centralization points of the inner and outer cutter boxes canbe reduced.

Description

technical field [0001] The invention relates to the field of TBM materials, in particular to a high-strength TBM center knife box and a preparation method. Background technique [0002] Hard rock tunnel boring machine (also known as "TBM") mainly relies on the disc-shaped hob to squeeze the rock to break the rock mass. TBM is called the king of construction machinery, and the hob is called the "teeth" of TBM. The knife box is the gum, which bears the alternating load when breaking rock. With the increase of rock strength, the efficiency of hob crushing rock gradually decreases, and the abnormal wear and replacement frequency of hob box also increase. Since the hob cutter box is welded on the cutter head, when cracks and cracks appear and need to be replaced, it will take time and effort and seriously affect the construction progress, reducing the excavation efficiency and increasing the tunnel construction cost. The traditional knife box is in the form of forging, and the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D9/087C22C38/04C22C38/12C22C38/02C22C38/44C22C38/46C22C38/50C22C38/48C21D1/30C21D1/74C21D1/18C21D9/00
CPCC21D1/18C21D1/30C21D1/74C21D9/0068C22C38/02C22C38/04C22C38/12C22C38/44C22C38/46C22C38/48C22C38/50E21D9/087
Inventor 谭顺辉龙伟漾于庆增郭志凯王梦凡杨兴亚
Owner CHINA RAILWAY ENGINEERING EQUIPMENT GROUP CO LTD
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