In the experiment, the spot diameter of the laser marking machine is fixed to a certain value, such as 0.2MM, the laser power is fixed at a different value, and the scanning speed is changed. When the scanning speed is too high, the action time between the laser beam and the paint is too short. The paint layer cannot be completely removed, and the scanning speed is too small, although the paint can be completely removed, but it is also easy to cause a greater thermal impact on the substrate, causing the substrate to deform and surface Damage, etc., therefore, to complete the cleaning work, the scanning speed should be controlled between the scanning speed that can completely clean the paint and the scanning speed to avoid damage to the substrate. During the experiment, the surface morphology of the sample after laser irradiation was observed under an optical microscope, and the maximum scanning speed to achieve complete cleaning of the paint and the minimum scanning speed to avoid matrix damage were detected under different laser powers. Increasing the gap between the scanning speed of laser cleaning paint and the scanning speed of matrix damage is suitable for engineering applications. Since the laser energy is continuous, it is unfavorable for the heat dissipation of the substrate. Therefore, while increasing the power, it is also necessary to increase the scanning speed to reduce the temperature rise of the substrate material, and reduce the temperature rise of the substrate material.
Now let's talk about the effect of the overlap between the scanning lanes of the laser marking machine on the paint stripping. Since the laser mode used in the experiment is quasi-Gaussian, the energy distribution in the center of the laser beam is relatively uniform, but the energy at the edge of the beam is relatively low. Therefore, the paint on the edge of the scan track is difficult to completely remove, and a certain amount of overlap is required between each scan track. A large area can be completely cleaned. Take the laser power as 500W and the spot diameter as 5mm. , The experiment was carried out under the condition of a scanning speed of 4 meters per minute. The experimental results showed that when the feed rate between scanning lanes is 3.5mm, that is, when the overlap between rows is about 40%, the paint is completely cleaned.
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