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

A technology of coating materials and main bearings, applied in metal material coating technology, coating and other directions, can solve problems that restrict the development of shield machine technology, achieve high fatigue limit, multiple impact resistance, and good wettability , Improve the effect of crevice corrosion resistance

Active Publication Date: 2021-06-29
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 a process method for repairing a main bearing of a shield machine, belonging to the technical field of surface treatment. A coating material for repairing the main bearing of a shield machine disclosed by the invention is composed of the following components in mass percentage: 0.53-0.60% C, 0.8-1.1% Si, 0.5-0.8% Mn, 0.9-1.2% Cr, 0.15 ~0.30% Mo, 0.10~0.20% W, 0.05~0.1% Cu, the balance is Fe and unavoidable impurities, and the mass percentage of each component is equal to 100%. The above powder is used to repair the main bearing of the shield machine through the laser cladding process, so that the main bearing raceway surface is laser clad with wear-resistant, corrosion-resistant and anti-fatigue coatings, and the life of the main bearing is extended, thereby realizing the shield machine. The service life is extended, and it plays a good role in 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 Patents(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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