Combined machining method for blade air film holes and device thereof

A technology of composite processing and processing equipment, applied in metal processing and other directions, can solve the problems of low efficiency, thermal damage, and inability to process thermal barrier coatings of single crystal alloys, and achieves simple and easy methods, strong environmental adaptability, and improved performance. The effect of hole efficiency and quality

Active Publication Date: 2021-01-05
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the deficiencies in the prior art, the present invention provides a composite processing method and device for performing laser-assisted drilling, electrolysis, and post-polishing post-treatment on superalloy blades with thermal barrier coatings, so as to solve the problem that conventional electrical processing methods cannot process thermal Barrier coatings, and ultrashort pulse laser processing of single crystal alloys have disadvantages such as low efficiency and thermal damage

Method used

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  • Combined machining method for blade air film holes and device thereof
  • Combined machining method for blade air film holes and device thereof

Examples

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Effect test

Embodiment 1

[0030]Example 1: This example is a composite processing method of laser-assisted drilling, electrolysis, and post-polishing post-treatment for superalloy blades with thermal barrier coatings. The outer surface of the quartz rod is coated and embedded in the drill bit , so that the laser beam produces total reflection inside the quartz rod, and then irradiates on the surface of the material to be processed, resulting in a local high temperature area, softening the material near the drill bit contact position, greatly reducing the drilling difficulty, increasing the drilling efficiency, and improving the drilling quality. After drilling through, with the drill bit as the cathode and the blade material as the anode, the drill bit rotates at a high speed and moves up and down, and performs electrolytic post-treatment on the metal part of the gas film hole to eliminate the residual stress, microcracks, and thermal damage areas of the hole wall; at the same time, the electrolyte in th...

Embodiment 2

[0034] Example 2: Coaxially embed the coated quartz rod in the drill bit, utilize the low absorption and total reflection of the laser in the quartz rod, irradiate the laser energy evenly on the surface to be processed, soften the material, and improve the drilling efficiency And quality, and rely on electrolysis and particle impact scratching to further improve the quality of air film holes. The processing method is divided into two steps. First, through laser heating to assist drilling, the required size of the air film hole is quickly drilled on the thermal barrier coating and the superalloy substrate; second, the high-speed rotating drill bit is used as the cathode, and the blade is used as the anode. , the drill bit moves up and down, and performs on-line electrolytic post-treatment on the gas film holes of the metal substrate to eliminate the residual stress and heat-affected zone defects during the drilling process; at the same time, there are tiny abrasive particles sus...

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Abstract

The invention discloses a combined machining method for blade air film holes and a device thereof, and relates to the field of non-traditional machining. The combined machining method comprises the steps that the air film holes with the needed size are rapidly drilled in a thermal barrier coating high-temperature alloy matrix through laser heating auxiliary drilling; secondly, a drill bit rotatingat a high speed serves as a cathode, blades serve as an anode, the drill bit moves up and down, online electrolysis aftertreatment is conducted on part of the air film holes of the metal matrix, andthe defects of residual stress, a heat affected zone and the like in the drilling process are eliminated; and meanwhile, tiny abrasive particles are suspended in the electrolyte, tiny impact scratching is conducted on the hole wall under the driving of the drill bit rotating at a high speed, the similar grinding and polishing effect is achieved, and the quality of the whole inner wall of the air film holes including the thermal barrier coating is further improved. The method is simple and easy to implement, laser transmission is not affected by the surrounding environment, the environmental adaptability is high, repeated tool setting is not needed, and the defects that the thermal barrier coating cannot be machined through a conventional electric machining method, the single crystal alloylaser machining efficiency is low, and thermal damage is likely to be generated are overcome.

Description

technical field [0001] The invention relates to the technical field of special processing, in particular to a composite processing method and device for laser-assisted drilling, electrolysis, and post-polishing treatment of air film holes in a blade with a thermal barrier coating. Background technique [0002] Increasing the combustion gas temperature at the turbine part is an important means to improve the performance of the aero-engine. However, limited by the performance of the engine blade material, excessive temperature will cause the blade metal material to fail. A layer of ceramic-based material is prepared on the surface of the blade at the high-temperature end of the engine to form a thermal barrier coating to separate the high-temperature gas from the metal material of the blade, thereby achieving the purpose of protecting the blade and slowing down the temperature rise. At the same time, a cold air channel is left inside the blade, and micro-holes are drilled on ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00B23H5/06B23H5/14B23P25/00
CPCB23H5/06B23H5/14B23P15/00B23P25/006
Inventor 朱浩杜文武王超张朝阳徐坤赵斗艳冒森山
Owner JIANGSU UNIV
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