Laser cladding repairing method for shaft parts

Abstract

The shaft part laser cladding repair method comprises pretreatment, the pretreatment comprises cleaning and cutting, the cleaning is to remove an oxide layer and impurities on the surface of a to-be-repaired part, the cutting is to remove cracks and peripheral damaged parts of the to-be-repaired part to form a cut channel, and after the pretreatment, the to-be-repaired part is subjected to laser cladding. Metal powder is laid in the channels, laser cladding repairing is conducted on the cracks through high-energy laser beams, and a repaired surface is formed; laser annealing is conducted, specifically, the surface is repaired through laser irradiation, local laser annealing treatment is conducted on the repaired surface, and residual stress is removed; laser shock treatment is conducted on the repaired surface, residual stress is further removed, and the quality of the repaired surface is strengthened. Local annealing is adopted, so that a heat affected zone is small, and the service life of other parts of the part is not affected; and after laser shock is finished, residual compressive stress is formed on the surface of the cladding layer and counteracts thermal stress generated during laser cladding, and the overall residual stress of the repairing layer is reduced.

Description

technical field [0001] The invention relates to the field of surface crack repair of shaft parts, in particular to a laser cladding repair method for shaft parts. Background technique [0002] With the rapid development of rail transit, the operation and maintenance requirements and technical level of rail vehicles are increasing day by day. Traction motor is an important part of rail transit. During operation, due to factors such as heavy load, alternating, and complex stress, the traction motor shaft fails. Directly scrapping the motor shaft with cracks will cause a waste of resources, which does not meet the requirements of my country's green development and green manufacturing. [0003] Laser cladding remanufacturing technology is an effective repair technology for traction motor shafts. It can significantly improve the wear resistance, corrosion resistance, heat resistance and oxidation resistance of the surface of the repair layer without affecting the properties of t...

AI Technical Summary

Problems solved by technology

The ultrasonic rolling process will lead to a reduction in the diameter size. Considering the dimensional error of the shaft and the processing error of the device, it is easy to have uneven final size of the shaft surface and deformation of the shaft surface.

[0010] The above existing technical solutions require multiple replacement of processing methods during the entire processing process, so it may need to be realized through repeated disassembly and assembly. The process is very cumbersome, which is not conducive to the rapid repair of the shaft, and it is easy to cause damage to the shaft surface during the disassembly process; Or it is necessary to integrate multiple processing modules on the equipment, the equipment cost is high, and the parameters are difficult to control

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