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

A disc-shaped hob and cutter ring technology, which is applied in mining equipment, earthwork drilling, tunnels, etc., can solve the problems of shallow permeation layer and few research reports on alloy steel carburizing, achieve uniform alloy composition and meet performance requirements , Control the effect of high precision

Active Publication Date: 2014-01-01
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

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The disc-shaped hob alloy and the disc-shaped hob cutter 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), ferrosilicon (containing 73wt% Si) master 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] The design alloy composition (mass percentage of elements) is: 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 added. The burning loss of each element is set to 16%C, 3%Si, 4%Mn, 2%Cr, 4%Mo, 8%V, and 13%Nb. The ingredients are distributed according to the design ingredients, and the total amount of ingredients is about 70kg.

[0025] (2) Vacuum induction furnace...

Embodiment 2

[0040] Prepare disc-shaped hob cutter ring alloy and disc-shaped hob cutter ring of the present invention by the method of embodiment 1, each process parameter and the parameter of the product that obtains are shown in Table 1, and difference is:

[0041] The raw materials are No. 45 steel, high-purity graphite, pure chromium, pure nickel, pure aluminum, ferromolybdenum (containing 61wt% Mo), ferro-vanadium (containing 51wt% V), ferro-niobium (containing 66wt% Nb), ferrosilicon (containing 73wt%Si) master alloy. The design alloy composition (mass percentage of elements) is: 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 and smelted for 3 minutes, then the samples were taken and measured. The analysis results showed that the contents of Mn and Mo were unqualified, and the corresponding intermediate alloy was calculated and ad...

Embodiment 3

[0044] Prepare disc-shaped hob cutter ring alloy and disc-shaped hob cutter ring of the present invention by the method of embodiment 1, each process parameter and the parameter of the product that obtains are shown in Table 1, and difference is:

[0045] The raw materials are 45 steel, high-purity graphite, pure chromium, pure aluminum, ferromolybdenum (containing 61wt% Mo), ferro-vanadium (containing 51wt% V), ferro-niobium (containing 66wt% Nb), and ferrosilicon (containing 73wt% Si) master alloy. The design alloy composition (mass percentage of elements) is: 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 respectively.

[0046] After the alloy melting was continued to smelt for 3 minutes, samples were taken and measured. The analysis results showed that the content of C, V, and Al was unqualified, and the corresponding intermediate alloy was calculated and added. %, Mn0...

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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] The construction of 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-scale construction projects such as mines, railways, and highways. The main tool for rock-breaking excavation is the key and vulnerable part of the shield machine. The hob ring is always in contact with the rock during the entire excavation process. It is the working edge of excavation and rock breaking. It not only bears the huge thrust from the shield machine, but also withstands the severe wear of various hard substances in the rock. The cutter ring is severely worn, and the cutter ring must be replaced frequently, and the consum...

Claims

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Application Information

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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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