Coating material and process method for repairing main bearing of shield tunneling machine

A technology of coating material and process method, which is applied in the direction of metal material coating process, coating, etc., can solve the problems that restrict the development of shield machine technology, and achieve the goal of improving crevice corrosion resistance, high purity, and high fatigue limit Effect

Active Publication Date: 2019-05-03
沈阳大陆激光工程技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The main bearing is the most stressed core component in the operation of the shield machine. It needs good durability and reliability. It is located on the cutter head system of the shield machine. The screwing and tunneling of the shield machine mainly rely on The main bearing is used for propulsion, and its value is huge. In the past, the main bearing of the shield machine was imported from abroad and could only rely on foreign technology, which seriously restricted the development of my country's shield machine technology.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The composition of the powder used is composed of 0.60%C, 1.1%Si, 0.8%Mn, 1.2%Cr, 0.3%Mo, 0.2%W, 0.1%Cu, and the balance is Fe and unavoidable impurities by weight percentage. The particle size of the ingredients is ≤400 mesh.

[0033] Prepare the powder with a particle size of ≤400 mesh according to the above composition ratio, place it in a mixer for mixing, and vacuum dry it when using it.

[0034] The cladding method is carried out in the following steps.

[0035] ① Grinding to remove the fatigue layer.

[0036] The wear surface of the main bearing of the wear shield machine is ground to remove the fatigue layer and pitting pits on the wear surface to obtain a smooth raceway surface.

[0037] ②Non-destructive testing.

[0038] Carry out penetrant flaw detection on the surface of the raceway to detect whether there are cracks. If there are cracks, continue grinding locally until there are no cracks.

[0039] ③Laser cladding.

[0040] On the surface of the treate...

Embodiment 2

[0046] The composition of the powder used is composed of 0.53%C, 0.8%Si, 0.5%Mn, 0.9%Cr, 0.15%Mo, 0.10%W, 0.05%Cu, the balance is Fe and unavoidable impurities by weight percentage. The particle size of the ingredients is ≤400 mesh.

[0047] The powder preparation method is the same as in Example 1.

[0048]The cladding method is the same as in Example 1, except that the laser cladding process parameters are: focal length of the focusing lens f=300mm; cladding power P=2500W; spot diameter D=3mm; cladding scan rate V=1000mm / min; The connection rate is 50%; the thickness of the cladding layer formed after cladding is 2.0mm.

Embodiment 3

[0050] The composition of the powder used is composed of 0.55% C, 1.0% Si, 0.8% Mn, 1.2% Cr, 0.25% Mo, 0.20% W, 0.10% Cu, and the balance is Fe and unavoidable impurities by weight percentage. The particle size of the ingredients is ≤400 mesh.

[0051] The powder preparation method is the same as in Example 1.

[0052] The cladding method is the same as in Example 1, the difference is that the cladding process parameters are: focusing mirror f=300mm, laser power P=2800W, focus spot diameter: D=3mm, scanning speed V=1500mm / min, lap rate T =50%, the thickness of the cladding layer formed after cladding is 3.0mm, and the surface hardness is HRC60.

[0053] Non-destructive testing was carried out on the working surface of the main bearing raceway after cladding, and there were no defects such as cracks and pores in the processed parts; the sample was placed in the laboratory simulation test field, and the fatigue life reached 10,000 hours.

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Abstract

The invention discloses a coating material and process method for repairing a main bearing of a shield tunneling machine, and belongs to the technical field of surface treatment. The coating materialfor repairing the main bearing of the shield tunneling machine is prepared from the following components in percentage by mass: 0.53-0.60% of C, 0.8-1.1% of Si, 0.5-0.8% of Mn, 0.9-1.2% of Cr, 0.15-0.30% of Mo, 0.10-0.20% of W, 0.05-0.1% of Cu and the balance of Fe and inevitable impurities, wherein the mass percentage of the components adds up to 100%. The powder is used for repairing the main bearing of the shield tunneling machine through a laser cladding process, so that an abrasion-resistant, corrosion-resistant and fatigue-resistant coating is laser-clad on the raceway surface of the main bearing, the service life of the main bearing is prolonged, the service life of the shield tunneling machine is prolonged, and a good effect is played on reducing the production cost.

Description

technical field [0001] The invention discloses a material and a process method for repairing the raceway surface of a worn main bearing of a shield machine, in particular relates to the preparation of a wear-resistant and fatigue-resistant coating by a laser cladding process, and belongs to the technical field of surface treatment. Background technique [0002] The shield machine is currently widely used in urban rail transit construction, underground pipelines and other urban underground spaces, railway and highway tunnel projects and other large-scale engineering equipment. The remanufacturing and use of shield machines has gradually formed a trend in 2016. The remanufactured shield machines have begun to be used in subway construction with good results. Due to their special construction requirements, shield machines are often used in one project section, and the whole The shield machine is scrapped, but as the main excavation equipment, the shield machine has a huge invest...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/10C22C38/22C22C38/20C22C38/04C22C38/02
Inventor 霍凤萍陈海涛董思远
Owner 沈阳大陆激光工程技术有限公司
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