Alloy for cutter ring of disk type hobbing cutter and preparation method thereof

A disc-shaped hob and cutter ring technology, which is used in mining equipment, earth-moving drilling, tunnels, etc., can solve the problems of shallow infiltration layer and few reports on carburizing of alloy steel, and achieve uniform alloy composition and meet performance requirements. , The effect of less investment in equipment

Active Publication Date: 2015-07-15
ZHUZHOU HARD ALLOY GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Carburizing heat treatment is an important method to improve the hardness and wear resistance of materials. It is often used in low-carbon alloy steel, and the toughness decreases with the increase of carburized layer thickness, but there are few research reports on carburizing medium-carbon and medium-alloy steel.
Although the carburized layer in the prior art improves the wear resistance and fatigue strength, the carburized layer is relatively shallow
[0005] In order to meet the application of shield cutters in harsh geological conditions, it is required that the shield cutter ring not only have high hardness but also good toughness, but toughness and hardness are a pair of contradictions, and the current reports cannot meet this requirement

Method used

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  • Alloy for cutter ring of disk type hobbing cutter and preparation method thereof
  • Alloy for cutter ring of disk type hobbing cutter and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The disk hob cutter ring alloy and the disk hob cutter ring of the present invention are prepared according to the following steps.

[0022] (1) Ingredients:

[0023] The raw materials are 45# steel, high-purity graphite, pure chromium, ferromolybdenum (containing 61wt% Mo), ferro-vanadium (containing 51wt% V), ferro-niobium (containing 66wt% Nb), and ferrosilicon (containing 73wt% Si) intermediate alloy , The quality requirements of 45# steel are in accordance with national standards, and the impurity content in other raw materials: S≤0.03%, P≤0.03%.

[0024] Design alloy composition (mass percentage of elements): C0.45%, Si0.5%, Mn0.65%, Cr5.2%, Mo1.4%, V0.8%, Nb0.5%, Fe balance. S and P are impurities, and the others are mixed in. The burning loss of each element is set to 16%C, 3%Si, 4%Mn, 2%Cr, 4%Mo, 8%V, 13%Nb. According to the designed ingredients, the total amount of ingredients is about 70kg.

[0025] (2) Melting in vacuum induction furnace:

[0026] Fill the raw mate...

Embodiment 2

[0040] The disk hob cutter ring alloy and disk hob cutter ring of the present invention were prepared according to the method of Example 1. The process parameters and the parameters of the obtained product are shown in Table 1. The differences are:

[0041] The raw materials are 45# steel, high-purity graphite, pure chromium, pure nickel, pure aluminum, ferromolybdenum (containing 61wt% Mo), ferro-vanadium (containing 51wt% V), ferroniobium (containing 66wt% Nb), ferrosilicon (containing 73wt% Si) master alloy. Design alloy composition (mass percentage of elements): C0.43%, Si0.7%, Mn0.75%, Cr1.3%, Mo0.45%, V0.9%, Nb0.06%, Al0.05%, Ni3%, the burning loss of each element is set to 16%C, 3%Si, 4%Mn, 2%Cr, 2%Ni, 4%Mo, 8%V, 13%Al, 13%Nb.

[0042] The alloy was melted for 3 minutes and then sampled and measured. The analysis results showed that the content of Mn and Mo was unqualified. The corresponding master alloy was calculated and added. After melting, the temperature was kept for ...

Embodiment 3

[0044] The disk hob cutter ring alloy and disk hob cutter ring of the present invention were prepared according to the method of Example 1. The process parameters and the parameters of the obtained product are shown in Table 1. The differences are:

[0045] The raw materials are 45 steel, high-purity graphite, pure chromium, pure aluminum, ferromolybdenum (containing 61wt% Mo), ferro-vanadium (containing 51wt% V), ferroniobium (containing 66wt% Nb), ferrosilicon (containing 73wt% Si) Master alloy. Design alloy composition (mass percentage of elements): C0.44%, Si1%, Mn0.5%, Cr5.3%, Mo1.5%, V1.4%, Nb0.25%, Al0.05%, each element The burning loss is set to 16% C, 3% Si, 4% Mn, 2% Cr, 4% Mo, 8% V, 13% Al, 13% Nb.

[0046] After the alloy is melted for 3 minutes, take samples and measure. The analysis results of C, V and Al content are unqualified. The corresponding master alloy is calculated and added. After melting, the temperature is kept for 1 minute, and then the alloy composition...

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Abstract

The invention relates to an alloy for a cutter ring of a disk type hobbing cutter, which comprises the following components in percentage by mass: 0.4-0.46% of C, 0.45-1.0% of Si, 0.48-0.74% of Mn, 1.3-5.4% of Cr, 0.4-1.4% of Mo, 0.86-1.33% of V, 0.06-0.54% of Nb, 0-0.05% of Al, 0-3% of Ni, no more than 0.009% of S, no more than 0.03% of P and the balance of Fe. The preparation method comprises the following steps: performing vacuum induction smelting on the raw materials, casting, forging, performing spheroidal annealing, performing gas carburization, performing vacuum quenching, and performing double tempering. The carburized layer of the prepared cutter ring of a disk type hobbing cutter is 1mm thick, the surface hardness of the carburized layer can be up to 60-63HRC, the internal average hardness is higher than 55HRC, and the impact toughness aku is up to 15-22J / cm<2>; and the shield cutter ring is high in hardness and favorable in toughness.

Description

Technical field [0001] The invention belongs to the field of iron and steel materials, and in particular relates to an alloy used for a disk-shaped hob cutter ring of a shield machine and a preparation method thereof. Background technique [0002] Shield tunnel boring machine (referred to as shield machine) has the advantages of high degree of mechanization, fast construction speed, and high safety. It is widely used in large construction projects such as mines, railways, and highways. Disk hobs are used as extrusion The main tool for rock breaking and tunneling is the key component and vulnerable part of the shield machine. The hob cutter ring is always in contact with the rock during the entire tunneling process. It is the working edge of tunneling and rock breaking. It not only bears the great thrust exerted by the shield machine, but also withstands the violent wear of various hard materials in the rock. As a result of serious wear of the cutter ring, frequent replacement of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/48C22C33/06C23F17/00E21D9/08
Inventor 林国标张忠键贺军王茂青赵伟朋马绍宏刘献良
Owner ZHUZHOU HARD ALLOY GRP CO LTD
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