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Shield body machining method for large-diameter shield tunneling machine

A processing method and shield machine technology, applied in the field of mechanical processing, can solve problems such as cracking or damage, large impact force, etc., and achieve the effects of reducing deformation and cracking, compact internal structure, and easy steering

Inactive Publication Date: 2018-12-11
中铁工程装备集团(天津)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the shortcomings in the prior art that the shield body of the shield machine will bear a large impact force during use, and will crack or be damaged, and proposes a shield body processing method for a large-diameter shield machine

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1: a shield body processing method of a large-diameter shield machine, comprising the following steps:

[0021] S1. Select Q345B steel as the raw material of the front shield, and preliminarily shape the steel into a billet according to the shape of the front shield through a hydraulic press, heat the billet to 1100 ° C, keep it for the first time for 6 hours, cool it to room temperature, and heat it again to 1100°C, after the second heat preservation for 24 hours, it is rapidly cooled in the cooling liquid;

[0022] S2. Heat the billet to 800°C, quickly cool to room temperature in the cooling liquid after the third heat preservation for 6 hours, and continue heating to 80°C, and slowly cool it at room temperature after the fourth heat preservation for 24 hours, and cool the cooled billet The material is placed in liquid nitrogen for 2 hours, then taken out, warmed up at room temperature for 12 hours, and then the primary product is obtained for later use;

...

Embodiment 2

[0026] Embodiment 2: A shield body processing method of a large-diameter shield machine, comprising the following steps:

[0027] S1. Select Q345B steel as the raw material of the front shield, and preliminarily shape the steel into a billet according to the shape of the front shield through a hydraulic press, heat the billet to 1150°C, keep it for 7 hours for the first time, cool it to room temperature, and heat it again to 1150°C, after the second heat preservation for 24 hours, it is rapidly cooled in the cooling liquid;

[0028] S2. Heat the billet to 820°C. After the third heat preservation for 7 hours, quickly cool it to room temperature in the cooling liquid, and continue heating to 80°C. After the fourth heat preservation for 24 hours, slowly cool it at room temperature. The billet is placed in liquid nitrogen for 2 hours, then taken out, warmed up at room temperature for 12 hours, and then the primary product is obtained for later use;

[0029] S3. Automatic cutting ...

Embodiment 3

[0032] Embodiment 3: a shield body processing method of a large-diameter shield machine, comprising the following steps:

[0033] S1. Select Q345B steel as the raw material of the front shield, and preliminarily shape the steel into a billet according to the shape of the front shield through a hydraulic press, heat the billet to 1150°C, keep it for 7 hours for the first time, cool it to room temperature, and heat it again to 1150°C, after the second heat preservation for 24 hours, it is rapidly cooled in the cooling liquid;

[0034] S2. Heat the billet to 830°C, quickly cool it to room temperature in the cooling liquid after the third heat preservation for 7 hours, and continue heating to 80°C, and slowly cool it at room temperature after the fourth heat preservation for 24 hours, and put the cooled The billet is placed in liquid nitrogen for 3 hours, then taken out, warmed up at room temperature for 12 hours, and then the primary product is obtained for later use;

[0035] S...

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PUM

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Abstract

The invention discloses a shield body machining method for a large-diameter shield tunneling machine. The method includes the following steps that S1, raw materials of a front shield are selected, steel is preliminarily formed into a blank material, the blank material is heated, subjected to heat preservation and cooled, and the blank material is heated again, subjected to heat preservation and rapidly cooled; S2, the blank material is quickly cooled in cooling liquid after heating and heat preservation and continues to be heated, the blank material is slowly cooled at room temperature after heat preservation, the cooled blank material is placed in liquid nitrogen for 2-3 h and then taken out, and after the temperature of the blank material rises up again under the room temperature condition, a primary finished product is obtained for use; S3, the primary finished product is automatically cut, inner holes are machined in the primary finished product, and rib plates, partition plates and conical plates are welded to plates from bottom to top to obtain the front shield; S4, a middle shield and a tail shield are machined; S5, assembling is conducted, wherein the front shield, the middle shield and the tail shield are assembled. A single uniform austenite structure is obtained through heating and cooling treatment, the plasticity and impact toughness of a shield body are reduced, and deformation and cracking of the shield body are reduced so that the shield body can bear larger impact force.

Description

technical field [0001] The invention relates to the technical field of mechanical processing, in particular to a shield body processing method of a large-diameter shield tunneling machine. Background technique [0002] The large-diameter shield machine has the characteristics of high technological content, complex manufacturing process, and high product added value. It represents the high-tech level and main development direction in the field of existing full-section tunnel excavation equipment. Rapid development in the direction of large cross-sections and long distances, and a number of large-diameter subsea tunnels and urban traffic tunnels have been built. The shield body of the shield machine needs to protect the internal materials of the shield machine during use, so the shield body of the shield machine has to bear a large impact force during use, so it often cracks or is damaged. [0003] Therefore, we propose a large-diameter shield machine shield body processing m...

Claims

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Application Information

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IPC IPC(8): B23P15/00
CPCB23P15/00
Inventor 寇治卫王杨鹏刘羡伦曾翔赵华张世展赵文佳张雪
Owner 中铁工程装备集团(天津)有限公司