Method for preparing cooling film hole in turbine blade with thermal barrier coating

Abstract

The invention discloses a method for preparing a cooling film hole in a turbine blade with a thermal barrier coating, and the method for preparing the cooling film hole in the turbine blade with the thermal barrier coating comprises the following steps: firstly, placing the turbine blade to be processed on a workbench, and fixing; then adjusting the included angle between femtosecond laser and the turbine blade through the angle of the cooling film hole, starting the femtosecond laser and setting laser parameters as follows: the pulse width is 290fs-10ps, the peak power is 12-14KW and the pulse frequency is 1kHz-1MHz, programming a laser rotary cutting route in a control system, setting the rotary cutting speed to 0.4-0.5 mm / s and the rotary cutting frequency to three times, preheating the turbine blade by utilizing high frequency, and then, carrying out rotary cutting on the turbine blade by utilizing high frequency; external nitrogen is conveyed to the workbench and the surface of the turbine blade through the nitrogen pipe, residues left during punching can be blown away and cleaned away, the situation that machining of the turbine blade by femtosecond laser is affected due to the fact that the residues move into a film hole is avoided, and high film hole machining quality is achieved.

Description

technical field [0001] The invention relates to the technical field of cooling air film hole processing, in particular to a method for preparing cooling film holes on a turbine blade with thermal barrier coating. Background technique [0002] Air film cooling is a very effective cooling method. The machining of air film holes for turbine blade cooling includes EDM and laser machining. The air film holes are small in diameter and complex in shape, and cannot be directly formed by casting, so they are all processed after casting. It is processed separately, which brings great difficulty to processing. At present, the mainstream method is EDM machining, but it is extremely difficult to manufacture tool electrodes, and it is difficult to process holes smaller than 200 microns. Complex special-shaped holes often require 50 microns. Machining accuracy and three-dimensional precision machining capability are difficult to achieve for EDM. Moreover, the surface of turbine blades is u...

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Problems solved by technology

[0004] The purpose of the present invention is to solve the following shortcomings in the prior art. Because the existing laser processing does not have a structure for stably controlling the shape of the gas film hole and the cleaning structure of the residue, when the residue cannot be cleaned in time during processing, it is inside the gas film hole The residue will affect the processing of femtosecond laser on turbine blades, so that the processing efficiency is low when femtosecond laser is processing turbine blades, and at the same time it will affect the specifications of air film holes. Method for preparing cooling film hole on blade

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