Laser generation method, YAG (yttrium aluminum garnet) laser and laser texturing processing device

Abstract

The invention discloses a laser generation method. A mechanical modulation disc made from a light-shading material is put in the resonant cavity of a laser; at least one light-transmission part for the laser axis to pass through is arranged on the mechanical modulation disc; and the rotation speed of the mechanical modulation disc is controlled so that the laser in the modulation period T is subjected to Q modulation and compression and then outputted in the time delta T in the form of consecutive pulses. The invention also discloses a YAG (yttrium aluminum garnet) laser for implementing the laser generation method and a laser texturing processing device. The laser texturing processing device has the advantages of high average power, monopulse energy and repetition rate, can be used for processing deeper and thicker roller materials, can generate deeper texturing points and higher surface roughness when being applied to laser texturing and can obtain higher texturing frequency and texturing processing efficiency.

Description

technical field [0001] The invention belongs to the field of laser texturing treatment on the surface of rollers, and in particular relates to a high-power pulse train laser generation method, a YAG laser and a laser texturing device. Background technique [0002] Textured steel plate has excellent stamping performance and surface coating performance, and is an important raw material widely used in automobiles, home appliances, electronics and light industry production. The key technology for the production of textured steel plate is roll surface texturing. Laser roll texturing technology is now It is a practical and advanced texturing technology among the several texturing technologies used (including shot peening, electric spark texturing and electron beam texturing). [0003] At present, the laser roll texturing technology is mainly divided into two categories: one is the use of CO 2 CO for gas lasers 2 Laser texturing, the other is YAG laser texturing using Nd:YAG soli...

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Problems solved by technology

But its disadvantage is that although the used acousto-optic Q-switching device has a high pulse frequency, its diffraction efficiency is limited; therefore, when the laser gain is high, the acousto-optic Q-switching device cannot provide a high enough loss to make The oscillation of the laser is effectively shut down

The above-mentioned limitations of the acousto-optic Q-switching device make the single pulse energy of the acousto-optic Q-switched pulsed Nd:YAG laser low, and the average power is also low, resulting in limited texturing roughness and low production efficiency, especially in higher roughness requirements. Lower production efficiency, difficult to meet the production needs of large rolling mills

[0009] Another disadvantage of YAG laser texturing is that the pulse width of the acousto-optic Q-switched pulse is very narrow (generally the standard acousto-optic Q-switched pulse width is 100-300ns), and the peak power is very high (megawatt level), so after the laser pulse is focused achieve very high peak power densities (10 7 W / cm 2 Above), the surface of the roll is directly vaporized under such high power density irradiation

Because the pulse width is very narrow, the result of laser pulse irradiation is to form very shallow pits. Practice has proved that such a pit structure is not suitable for roughness transfer during cold rolling.

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