A laser drilling device and method for improving hole quality based on underwater drilling

Abstract

The invention discloses a laser drilling device and method for improving the quality of drilling based on underwater laser drilling, and relates to the field of laser drilling. The laser beam emitted by the laser head and the three-dimensional position of the workpiece can be changed. The laser head includes a first A plane reflector, a half-wave plate, a second plane reflector, a spatial light modulator, a 1 / 4 wave plate, a third plane reflector and a focusing lens; the laser beam emitted by the laser head irradiates the first plane On the mirror, it is reflected by the first plane mirror to the half-wave plate, and then reflected to the spatial light modulator by the second plane mirror; after passing through the 1 / 4 wave plate, it is irradiated to the third plane mirror again, and after focusing The lens is focused to irradiate the workpiece. The problems of recasting layer and burrs in the prior art are solved by changing the structure of the laser and adding interdigitated electrodes above the workpiece.

Description

technical field [0001] The invention relates to the technical field of laser drilling, in particular to a laser drilling device for improving the quality of drilling based on underwater drilling. Background technique [0002] In order to meet the performance requirements of advanced engines such as high thrust-to-weight ratio and high combustion efficiency, the hot-end parts of the engine (such as combustion chambers, turbine blades, etc.) work at extremely high temperatures. At present, the inlet temperature of the advanced engine has reached above 1650°C, which is much higher than the maximum withstand temperature of the most advanced fifth-generation single crystal nickel-based superalloy of 1300°C, so the hot end parts of the engine are widely used in film cooling technology . The diameter of the film cooling hole is generally between 0.20 and 1.25mm, and the ratio of depth to diameter is large, and there are hundreds of film holes distributed on a single blade, and eve...

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Problems solved by technology

Abrasive flow grinding is based on the principle of least resistance. Large holes have more material removed, and small holes have little or no material removal. The hole expansion is uneven and there is a recast layer that cannot be removed from the processing "dead angle" area. especially in the middle of the hole

The overall chemical corrosion method also has a corrosive effect on the workpiece substrate, while the directional chemical corrosion method has poor versatility, and different metal materials or organizational structures require different directional corrosion solutions

After millisecond laser drilling parameters are optimized, the thickness of the recast layer can be significantly reduced, but there is still a thin recast layer; femtosecond secondary processing can completely remove the recast layer, but the femtosecond laser is expensive, requires high processing conditions, and has high efficiency. Low

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