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Anti-decarburization heat treatment method for hobbing cutter ring of shield tunneling machine

A heat treatment method and anti-decarburization technology, applied in heat treatment furnaces, heat treatment equipment, furnaces, etc., can solve the problems of high cost, poor strength, parameter design and complex operation of vacuum heat treatment

Active Publication Date: 2020-12-29
广州鑫润丰东热处理有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, the Chinese invention patent (CN107060789A) discloses a cutter ring material and heat treatment process of a shield tool. The cutter ring is quenched and tempered twice after the overall graded heating of the cutter ring in a vacuum furnace, which solves the problem of decarburization and poor strength of the cutter ring during heat treatment. The problem
However, in this method, the cost of vacuum heat treatment is high, and the parameter design and operation are complicated, which increases the cost of tool ring processing and manufacturing, and cannot take into account the cost of tool replacement and processing and manufacturing.

Method used

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  • Anti-decarburization heat treatment method for hobbing cutter ring of shield tunneling machine
  • Anti-decarburization heat treatment method for hobbing cutter ring of shield tunneling machine
  • Anti-decarburization heat treatment method for hobbing cutter ring of shield tunneling machine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] The material of the hob cutter ring of the shield machine is 4Cr5MoSiV1, the element composition is C 0.42%, Cr 5.36%, Mo1.40%, Si 1.14%, V 0.83%, and the balance is Fe and unavoidable impurities;

[0070] Composition of the first anti-oxidation coating: Na 2 O 2SiO 2 20%;Al 2 o 3 20%;Cr 2 o 3 10%; NaF 5%; TiO 2 5%; V 2 o 5 4%; water balance;

[0071] The second anti-oxidation coating composition: SiC 3%; Graphite powder (1000 orders) 30%; Poly-internal olefin 30%; Water surplus;

[0072] The composition of briquettes is: 30% sodium nitrate, 2% potassium nitrate, 20% charcoal powder, 30% anthracite, 15% carbonized sawdust, 1% tungsten oxide, and 2% yellow mud;

[0073] The coal briquettes are honeycomb briquettes, and the size conditions are as follows: the diameter is 120mm, the height is 75mm, the honeycomb aperture is 12mm, and the number of holes is 12.

[0074] Coat the surface of the hob cutter ring of the shield machine to be heat treated with the first...

Embodiment 2

[0084] The material of the hob cutter ring of the shield machine is 4Cr5MoSiV1, the element composition is C 0.39%, Cr 5.1%, Mo1.20%, Si 1.1%, V 0.9%, and the balance is Fe and unavoidable impurities; other technical means and Application example 1 is the same.

Embodiment 3

[0091] The material of the hob cutter ring of the shield machine is 4Cr5MoSiV1, the element composition is C 0.47%, Cr 4.9%, Mo1.0%, Si 1.1%, V 1%, and the balance is Fe and unavoidable impurities; other technical means and Application example 1 is the same.

[0092] Comparative example 2

[0093] The material of the hob cutter ring of the shield machine is 4Cr5MoSiV1, the element composition is C 0.47%, Cr 4.9%, Mo1.0%, Si 1.1%, V 1%, and the balance is Fe and unavoidable impurities; other technical means and Consistent with Comparative Example 1.

[0094] The hardness of the surface of the hob cutter ring obtained by heat treatment in Comparative Example 3 and Example 3 was tested, and the hardness of the surface of the hob cutter ring obtained in Comparative Example 3 was 47HRC, and the hardness of the surface of the hob cutter ring obtained in Example 3 was 59HRC.

[0095] The metallographic structure of the surface of the hob cutter ring obtained by heat treatment in Co...

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Abstract

The invention belongs to the technical field of cutters of shield tunneling machines, and particularly relates to an anti-decarburization heat treatment method for a hobbing cutter ring of a shield tunneling machine. The anti-decarburization heat treatment method of the hobbing cutter ring of the shield tunneling machine comprises the following steps of: placing the hobbing cutter ring with the surface coated with an oxidation coating, of the the shield tunneling machine in a cavity of heat treatment equipment, and raising the temperature to the final temperature under the normal pressure, performing heat preservation and heat treatment, wherein coal balls are placed in the cavity of the heat treatment equipment; the oxidation coating comprises a first anti-oxidation coating and a second anti-oxidation coating in sequence from inside to outside; the first anti-oxidation coating is prepared from Na2O. 2SiO2, Al2O3, Cr2O3, NaF, TiO2 and V2O5; and the second anti-oxidation coating is prepared from SiC, graphite powder and polyinternalolefin. Test results show that the surface structure of the hobbing cutter ring treated by the anti-decarburization heat treatment method provided by theinvention is a large amount of lath martensite, and the hobbing cutter ring has obvious embossments on the surface and the hardness of 54 HRC.

Description

technical field [0001] The invention belongs to the technical field of shield machine cutters, and in particular relates to an anti-decarburization heat treatment method for a hob cutter ring of a shield machine. Background technique [0002] The shield machine is a super-large mechanical equipment dedicated to the excavation of hard rock formations. The cutter head of the shield machine is neatly equipped with replaceable disc-shaped hobs. Through the rotation and advancement of the cutter head, the rocks are broken and peeled off by the rolling and impact of the outermost cutter ring of the hob, and then gradually penetrate the tunnel. As the key consumables of the shield machine, the processing performance of the hob cutter ring of the shield machine directly determines the use cost and work efficiency of the shield machine. [0003] At present, there are two heat treatment processes for shield machine hob cutter rings, which are full hard heat treatment and ladder hard ...

Claims

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Application Information

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IPC IPC(8): C21D1/70C21D1/72C21D1/18C21D9/22
CPCC21D1/70C21D1/72C21D1/18C21D9/22
Inventor 袁志钟韦家波张琰琳袁飞曹赟段旭斌罗锐程晓农
Owner 广州鑫润丰东热处理有限公司
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