Annular compound pulse laser drilling method and device

Abstract

The embodiment of the invention provides a ring composite pulse laser drilling method and device. The method comprises the following steps: generating a short-pulse-width pulse train; generating long-pulse-width pulses, and adjusting spatial distribution of long-pulse-width pulse energy to enable energy flow density of a center of a long-pulse-width pulse spot to be smaller than energy flow density of a position close to a periphery of the spot and to enable diameter of craters produced by the long-pulse-width pulses and the short-pulse-width pulse train on a surface of a component to be equal; adjusting the long-pulse-width pulses to enable the energy of the long-pulse-width pulses to be equal to or greater than melting heat needed for melting a sidewall of a small hole and a melt flow layer of a hole bottom in a drilling process of the short-pulse-width pulse train; performing beam combination on the short-pulse-width pulse train and the long-pulse-width pulses through a beam combination device to form a ring composite pulse; emitting the ring composite pulse to the component to perform laser drilling. The ring composite pulse laser drilling method and device can machine a film hole in an aero-engine component at high efficiency and high quality, and can effectively reduce the maximum recast layer thickness of the film hole in a turbine blade.

Description

technical field [0001] The invention relates to the field of laser drilling, in particular to a ring compound pulse laser drilling method and device, in particular to a ring compound pulse laser drilling method and device for aeroengine components. Background technique [0002] Various known methods for drilling holes in the above-mentioned member, especially using a specific laser device, can be roughly classified into three types according to the pulse width of the laser. [0003] The first type of approach uses flashlamp-pumped millisecond pulsed lasers. This kind of laser generates high-energy long-pulse width pulses with long pulse widths. The pulse width is generally not less than 0.1 milliseconds, such as 1 millisecond; the energy is generally between 1 joule and 300 joules, such as 10 joules. Long-pulse laser drilling produces a large melt flow, and the process is difficult to control, resulting in a thick recast layer and microcracks extending to the substrate. ...

AI Technical Summary

Problems solved by technology

The short pulse width pulse drilling method cannot significantly reduce the thickness of the recast layer when the pulse width is in the range of 50 nanoseconds to 500 nanoseconds; when the pulse width is less than 10 nanoseconds, the drilling efficiency becomes extremely low

In order to improve the short pulse drilling rate, the high repetition frequency drilling technology has emerged, which cannot solve the problem of processing quality degradation caused by increasing the rate

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