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What should I do if the engraving effect of the laser marking machine is uneven?

2020-11-20 09:49:41
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Laser engraving technology is slowly entering our daily lives. When we apply laser engraving patterns, we often encounter such a problem:

"Why is the actual effect of laser engraving uneven?" Laser marking machine

  1. Use off-focus marking to mark the content of the corresponding area: The method of off-focus marking must take into account the problem of laser energy, because every focusing lens has a matching focal depth area, and the off-focus method is used It will easily lead to the large area marking pattern, the edge is at the critical point of the focal depth or exceeds the focal depth area, which will easily lead to the unevenness of the actual effect.

  2. Thermal lens phenomenon: When the light passes through the optical lens (refraction, reflection), the lens will become hot and cause slight deformation. This kind of deformation will increase the focus of the beam and shorten the focal length. If the machine equipment is fixed and the distance is adjusted to the focal point, after a certain period of time, the light energy density acting on the raw material will change because of the thermal lens phenomenon.


激光雕刻机

3. The output spot of the paid light is concealed, that is, the spot of the paid light beam is missing after passing through the galvanometer and field lens, and is not round enough: The output head, fixed fixture, and galvanometer are not aligned, causing the paid light to pass through vibration. Part of the light spot is masked during the lens, and the light spot on the frequency doubler film after being focused by the field lens is non-circular. There is another situation, that is, the deflection lens of the galvanometer is damaged. When the light beam passes through the damaged area of the lens, it cannot be effectively reflected. Therefore, the laser energy of the laser beam passing through the damaged area of the lens is different from that of the non-damaged area of the lens. As a result, the energy of the delivered light acting on the raw material is also different.

4. Due to the raw materials, such as the thickness of the film on the surface of the raw materials is different or the physical characteristics change: The raw materials are particularly sensitive to the light energy response. Generally, under the same raw material, it is corresponding that the light energy reaches the raw material damage threshold. When the thickness of the coating on the surface of the raw material is different, or when some other physical processes are not uniform enough.

5. The same horizontal plane of the machine and equipment is not aligned, that is, the lens or field lens is different from the production and processing table. In view of the difference between the two and the horizontal plane, it will cause the light beam to reach the distance on the production and processing items after passing through the field lens. The length is inconsistent, and the result is that the energy that falls on the produced and processed items will have a different energy density

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