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Method for repairing journal of generator rotor

A generator rotor and rotor shaft technology, applied in metal material coating process, coating, etc., can solve problems such as inclusions, easy generation of pores, and low efficiency of repairing wide surfaces, and achieve the effect of fast speed and unchanged performance

Inactive Publication Date: 2019-03-29
成都大陆激光技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The disadvantage is that the efficiency of repairing the wide surface is low, the quality of manual welding is greatly affected by human beings, and it is easy to produce pores and inclusions.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The method for repairing the generator rotor journal includes the following steps:

[0029] (1) Determine the repair area and detect the original data of the rotor;

[0030] (2) Coloring flaw detection, check whether there are cracks in the damaged area of ​​the rotor journal;

[0031] (3) The thickness of the fatigue layer is 0.3mm;

[0032] (4) Laser cladding alloy powder with 25Cr2Ni4MoV alloy rotor, the specific formula is C: 0.009%, Cr: 17.10%, N: 0.16%, B: 0.5%, Mo: 1.2%, Ni: 7.2%, Si: 1.18 %, Mn: 0.17%, the balance is Fe;

[0033] (5) Use laser to repair Laser power: 2000~2500W, spot diameter: 2mm, powder thickness: 0.5mm, scanning speed: 800mm / min;

[0034] (6) Use the accompanying processing equipment of the mechanical shaft to restore the original data size of the rotor journal at the repair site.

Embodiment 2

[0036] The method for repairing the generator rotor journal includes the following steps:

[0037] (1) Determine the repair area and detect the original data of the rotor;

[0038] (2) Coloring flaw detection, check whether there are cracks in the damaged area of ​​the rotor journal;

[0039] (3) The thickness of the fatigue layer is 0.3mm;

[0040] (4) Laser cladding alloy powder with 25Cr2Ni4MoV alloy rotor, the specific formula is C: 0.009%, Cr: 17.10%, N: 0.16%, B: 0.5%, Mo: 1.2%, Ni: 7.2%, Si: 1.18 %, Mn: 0.17%, the balance is Fe;

[0041] (5) Use laser to repair Laser power: 2000~2500W, spot diameter: 2.5mm, powder thickness: 1mm, scanning speed: 800mm / min;

[0042] (6) Use the accompanying processing equipment of the mechanical shaft to restore the original data size of the rotor journal at the repair site.

[0043] In the above two embodiments, the 25Cr2Ni4MoV alloy rotor did not leave the installation site during the repair process, avoiding rotor damage and const...

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Abstract

The invention discloses a method for repairing a journal of a generator rotor. The method comprises the following steps of determining a repair area, detecting original data; carrying out dye penetrant inspection, checking whether cracks exist in the damaged region of the rotor journal; removing the fatigue layer; configuring the laser cladding alloy powder; carrying out repairing by using the laser; restoring the original data size of the rotor journal.

Description

technical field [0001] The invention relates to the field of mechanical repair, in particular to a method for repairing a generator rotor shaft journal. Background technique [0002] The generator rotor is an important part of the generator set. Due to the perennial operation of the generator set, the rotor shaft neck often suffers from strain and wear, which affects the safe operation of the unit and needs to be repaired. [0003] Traditional repair method: [0004] 1. Return to factory turning [0005] The advantage is that the surface material of the journal of the turning part does not change, and the finish is high. The disadvantage is that it takes a long time to return to the factory for turning and the cost is relatively high. After turning the two-ball journal, it must be equipped with non-standard tiles. If the rotor is damaged again, it may be scrapped. [0006] 2. Electroplating repair [0007] The advantage is on-site repair, easy operation and short repair ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/10
CPCC23C24/106
Inventor 齐海红刘作彩
Owner 成都大陆激光技术有限公司
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