Special device for one-step remelting of turbine blade thermal barrier coating

Abstract

The present invention belongs to the field of laser remelting technology, and especially provides a laser remelting device easy to control blade deformation and stress caused by remelting heating and capable of automatic remelting of a turbine turbofan blade thermal barrier coating. According to the present invention, single-sided machining in a laser remelting process becomes a bilaterally symmetric processing; the device can complete one-time high-quality laser remelting processing on the thin wall surface through the preset laser remelting process parameters, and effectively avoid workpiece macroscopic deformation caused by uneven heating in laser remelting. The device has the advantages of high degree of automation, easy operation and good quality control, and especially applicable to laser remelting processing on a variety of thin-walled part surfaces.

Description

Technical field [0001] The invention belongs to the technical field of laser remelting, and particularly refers to a laser remelting device that is convenient to control blade deformation and stress caused by remelting heating, and can realize automatic remelting of the thermal barrier coating of a turbofan blade. Background technique [0002] Laser remelting is the most widely used laser surface treatment technology, widely used in various industries, such as automobile manufacturing, machine tool manufacturing, petrochemical industry, etc., but the existing laser remelting device has two major shortcomings: (1 ) Most of the processed objects are plane (thick parts) and rotating body laser remelting, that is, the object to be remelted must be placed on the worktable; (2) For thin-walled and special-shaped parts, it is difficult to control the energy density and thermal deformation, resulting in Laser remelting of thin-walled parts is difficult to achieve, and it is even more dif...

AI Technical Summary

Problems solved by technology

[0002] Laser remelting is the most widely used laser surface treatment technology, widely used in various industries, such as automobile manufacturing, machine tool manufacturing, petrochemical industry, etc., but the existing laser remelting device has two major shortcomings: (1 ) Most of the processing objects are flat (thick parts) and laser remelting of rotating bodies, that is, the objects to be remelted must be placed on the workbench; (2) For thin-walled and special-shaped parts, it is difficult to control the energy density and thermal effect deformation, resulting in Laser remelting of thin-walled parts is difficult to achieve, and it is even more difficult to ensure the quality of remelting, which limits the application of laser remelting technology in many special parts and special fields; in the actual engineering application process, laser remelting is required in many occasions Melting, in order to obtain a better bonding force between the coating and the substrate, improve its resistance to high temperature oxidation corrosion wear resistance and thermal shock resistance; - Physical vapor deposition (EB-PVD) and other technologies prepare thermal barrier coatings, but these technologies all have the problem of low bonding strength between thermal barrier coatings and substrates, which greatly reduces the thermal shock resistance life of thermal barrier coatings

[0003] In order to improve the service life of thermal barrier coatings for engine turbine blades, many researchers have proposed the combination of plasma spraying, electron beam-physical vapor deposition (EB-PVD) and laser remelting technology to prepare thermal barrier coatings. It can not only ensure the uniformity of the coating, but also enhance the bonding force between the coating and the substrate; however, since single-beam laser processing is prone to thermal stress and deformation of thin-walled workpieces in laser remelting, such a technical path is difficult to achieve in practice industrial application

Images