Combined machining method for blade air film holes and device thereof

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 ...

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