A kind of high-strength TBM center tool box and preparation method

A high-strength, tool-box technology, used in manufacturing tools, mining equipment, earth-moving drilling, etc., can solve the problems of cracking, low-strength tool-box, easy crushing, etc., to improve strength and fatigue performance, improve parts strength, The effect of increasing the service life

Active Publication Date: 2021-04-23
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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  • A kind of high-strength TBM center tool box and preparation method
  • A kind of high-strength TBM center tool 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 knife box and a preparation method thereof, comprising an outer knife box and an inner knife box, the outer knife box is made of structural steel material, the inner knife box is made of low-carbon medium alloy structural steel material, and the inner and outer knife boxes are welded combined in a way. The inner knife box of the present invention adopts quenching and tempering and hardening treatment, and at the same time adopts the form of welding the inner and outer knife boxes to connect, the inner and outer knife boxes are formed by forging process, and the inner knife box is made of low-carbon medium alloy structural steel to reduce the welding stress concentration of the inner and outer knife boxes. Cracking and deformation; the surface hardening treatment of the inner knife box can improve the strength and fatigue performance of the bearing part, and the stress relief annealing treatment of the inner and outer knife boxes can effectively reduce the distribution of residual stress in the forging process and the welding stress concentration point of the inner and outer knife boxes.

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 Patents(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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