A Heat Treatment Process for 3m Bearing Ring of Shield Machine

A bearing ring, shield machine technology, applied in heat treatment furnaces, heat treatment equipment, manufacturing tools, etc., can solve problems such as unreported heat treatment process research, and achieve the effect of satisfying hardenability

Inactive Publication Date: 2016-06-15
UNIV OF SCI & TECH BEIJING
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

At present, there is no report on the steel used and the heat treatment process that meet the performance of the 3m bearing ring of the shield machine

Method used

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  • A Heat Treatment Process for 3m Bearing Ring of Shield Machine
  • A Heat Treatment Process for 3m Bearing Ring of Shield Machine

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Experimental program
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Embodiment

[0023] A steel for bearing rings after alloying design has the following chemical composition in mass percentage: 0.39%C, 0.26%Si, 0.64%Mn, 0.76%Cr, 1.49%Ni, 0.06%Cu, 0.19%Mo, 0.014%P, 0.002%S, the balance is Fe.

[0024] The heat treatment process parameters adopted in the embodiment are shown in Table 1. The impact toughness and hardness of the quenched and tempered state after heat treatment and the hardness after surface induction hardening are shown in Table 2. It can be seen that the impact toughness AK of the matrix at -20°C v The average value is 115J, the average hardness of the matrix is ​​293HB, and the average surface quenching hardness is 57.9HRC. It can be seen that after the composition design and heat treatment process, the matrix toughness, hardness and surface induction hardening hardness can meet the performance requirements of the steel for the 3m bearing ring of the shield machine.

[0025] The heat treatment process parameter that the embodiment of tab...

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Abstract

The invention relates to a heat treatment process for a 3m bearing ring of a shield machine. Alloying the ordinary medium-carbon alloy steel 42CrMo was carried out to obtain the steel used for the 3m bearing ring of the shield machine; the bearing ring blank produced with this steel was heated to a certain temperature and kept for a certain period of time, then oil cooled to room temperature, and then Perform high-temperature tempering at a certain temperature, keep it warm for a certain period of time, take it out and cool it to room temperature; Inductively heat the surface of the machined ferrule at a certain heating rate to a certain temperature for quenching. After the experimental steel was treated by this process, the structure of the hardened layer on the surface of the bearing ring of the shield machine was cryptocrystalline martensite, and the matrix structure was tempered sorbite; the surface had a relatively high hardness, with an average value of 57.9HRC; the core Has good toughness, -20°C impact toughness AK v The average value is 115J, and the appropriate hardness is 293HB. Therefore, it can meet the requirements of comprehensive mechanical properties of the steel used for the 3m bearing ring of the shield machine.

Description

technical field [0001] The invention belongs to the field of metal materials, and relates to a heat treatment process for a 3m bearing ring of a shield machine, in particular to a component design and a heat treatment process for the comprehensive mechanical properties of steel used for a 3m bearing ring of a shield machine. Background technique [0002] At present, my country's economy is in a period of sustained and rapid development. Due to the needs of industrialization and infrastructure construction, a large number of traffic tunnels, urban underground railways, water supply and drainage tunnels, and cable tunnels have been built, are being repaired, or are being planned. The shield machine is the main construction machine in the shield construction. The bearing ring of the shield machine is the main part of the shield machine bearing. The service mode is low speed and heavy load. load and overturning moment. Therefore, on the basis of high fatigue strength, hardness,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D9/40C22C38/44C22C38/22C21D1/18
Inventor 刘雅政蒋波周乐育张朝磊文新理董正强
Owner UNIV OF SCI & TECH BEIJING
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