Disk-shaped roller cutter ring and manufacture method thereof

A disc-shaped hob and knife ring technology, which is applied in the manufacture of tools, furnaces, heat treatment equipment, etc., can solve the problems of easy fracture and poor wear resistance, and achieve the goal of improving hardenability, reducing temper brittleness, and reducing construction costs Effect

Active Publication Date: 2012-06-27
ZHUZHOU HARD ALLOY GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the commonly used materials for cutter rings are 4Cr5MoSiV1, 40CrNiMo, and H13, but these cutter rings have the problem of poor wear resistance or easy fracture in the tunneling of hard rock and upper soft and lower hard rock layers.

Method used

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  • Disk-shaped roller cutter ring and manufacture method thereof
  • Disk-shaped roller cutter ring and manufacture method thereof
  • Disk-shaped roller cutter ring and manufacture method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Example 1: The main components of the material for manufacturing disc-shaped hob cutter rings are (wt.%): C 0.5, Si 0.93, Mn 0.43, Cr 5.43, Mo 1.31, V 1.0, Fe balance; impurities (wt.%) : P 0.011, S 0.004.

[0021] The above materials are smelted in an electric furnace and electroslag remelted to make ingots, and then heated to make round bars, which are pre-forged at a forging ratio of 4 to 6 to make the material rough, and then according to the required shape of the knife ring, use a mold to The material is forged into a knife ring blank. Slowly cool after forging and anneal immediately. The annealing process heats up at a rate of 60-80°C / h, heats it at 900°C for 5-6 hours, cools at a rate of 40-60°C / h to 750°C and holds it for 4 hours, and then Cool at a rate of 40-60°C / h, take out the furnace at 500°C, and air-cool.

[0022] After cooling, the cutter ring blank is turned according to the required cross-sectional shape, and the hardness is tested, which is required...

Embodiment 2

[0026] Embodiment 2: The main components, smelting, forging, and annealing processes of the materials for manufacturing the disc-shaped hob cutter ring are all the same as in Embodiment 1, and the cutter ring blank is obtained.

[0027] Quench the blank of the knife ring through a vacuum quenching furnace. First, the blank is heated from room temperature to 700°C at a speed of <200°C / h, and kept for 2h. Then, the blank is heated to 870°C at a speed of <180°C / h, and kept for 1.5h. Then Continue to heat up to 1030°C, keep it warm for 1h, and finally carry out oil quenching, and then tempering can be carried out after cooling to below 60°C.

[0028] Tempering at 530°C for the first time (3h holding time), and tempering at 520°C for the second time (2h holding time). Check the knife ring, the overall surface hardness HRC55-58 is a qualified knife ring. This disc hob cutter ring is suitable for tunneling in hard rock formations.

[0029] Configure a rotary platform on the medium ...

Embodiment 3

[0031] Example 3: The main components of the material for manufacturing the disc-shaped hob cutter ring are (wt.%): C 0.48, Si 0.97, Mn 0.40, Cr 5.30, Mo 1.28, V 0.97, Fe balance, impurities: P 0.02, S 0.003.

[0032]The above materials are smelted in an electric furnace and electroslag remelted to make ingots, and then heated to make round bars. The materials are forged at a forging ratio of 4 to 6, and then the materials are forged with molds according to the desired shape of the knife ring. Into a knife ring blank. Slowly cool after forging and anneal immediately. The annealing process is to raise the temperature at a rate of 60-80°C / h, keep it at 890°C for 5-6 hours, cool at a rate of 40-60°C / h to 740°C and hold it for 4 hours, and then Cool at a rate of 40-60°C / h, take out the furnace at 500°C, and air-cool.

[0033] After cooling, the cutter ring blank is turned according to the required cross-sectional shape, and the hardness is tested, which is required to be lower t...

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Abstract

The invention discloses a disk-shaped roller cutter ring with high hardness, good toughness and excellent comprehensive performance. The disk-shaped roller cutter ring comprises the following ingredients of: 0.46-0.56% of C, 0.80-1.20% of Si, 0.20-0.65% of Mn, 5.00-5.80% of Cr, 1.15%-1.55% of Mo, 0.85-1.40% of V and the balance Fe and impurities, wherein the content of P is no more than 0.02%, and the content of S is no more than 0.01%; and the overall hardness of the cutter ring is HRC55-61 (Rockwell Hardness C55-61), or the hardness is of graded distribution, i.e. the hardness of a working edge area is HRC55-61, the hardness of a transition surface area is HRC50-57, and the hardness of a step assembly surface area and an inner ring is HRC44-51. A preparation method of the disk-shaped roller cutter ring comprises the following steps of: smelting the raw materials in an electric furnace; carrying out electroslag remelting; preforging; carrying out die forging; carrying out slow cooling; annealing; carrying out rough machining to obtain a disk-shaped roller cutter ring rough blank; carrying out high-temperature vacuum hardening and two-time high-temperature tempering on the cutter ring rough blank; carrying out low-temperature destressing treatment; carrying out fine finishing to obtain the cutter ring with the overall hardness of HRC55-61, wherein the cutter ring with the overall hardness of HRC55-61 is applicable to the tunneling of a hard rock formation by a shield tunneling machine; or carrying out medium-frequency induction tempering treatment prior to the low-temperature destressing treatment to obtain the cutter ring with graded-distribution hardness, wherein the cutter ring with the graded-distribution hardness is applicable to the tunneling of a rock formation with an upper soft part and a lower hard part.

Description

technical field [0001] The invention relates to a material and a manufacturing method of a disc-shaped hob cutter ring used for tunnel excavation of a shield machine, and further relates to a disc-shaped hob cutter ring with gradient distribution of hardness. Background technique [0002] Shield machine construction has the advantages of high degree of mechanization, fast construction speed, and high safety. It is widely used in tunnel excavation of major projects such as subways, railways, and hydropower. When the shield machine is used in the construction of full-section hard rock or the construction of upper soft and lower hard composite strata, the disc hob is mostly used. When working, the disc hob cutter ring is pressed into the rock mass under the thrust of the shield machine to break the rock. As a rock-breaking tool, the disc hob not only bears a large radial rock-breaking force, but also suffers from severe wear of the hard mineral phase of the rock. Therefore, th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/24C22C33/04C21D8/00C21D9/22
Inventor 谢俊杰马绍宏邓小和唐欢谢幸林
Owner ZHUZHOU HARD ALLOY GRP CO LTD
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