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

Laser engraving technology is slowly entering our daily life. When we apply laser engraving graphics, we often encounter such a problem:

Why does laser engraving actually work? Will it be uneven?

1. Use off-focus to mark the content of the corresponding area: The method of off-focus marking must take into account the problem of laser energy, because each focusing mirror is There is a matching focal depth area, and using the out-of-focus method will easily lead to the large area marking pattern, the edge is at the focal depth critical point or exceeds the focal depth area, which can easily lead to inhomogeneity of the actual effect. .

2. Thermal lens phenomenon: When the light passes through the optical lens (refraction, reflection), the lens will be hot and cause slight deformation. This deformation will raise the focal point 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 is turned on, the energy density of the light acting on the raw material will change due to the phenomenon of thermal lens.

3. The light output spot is covered, that is, the light spot is missing after passing through the galvanometer and field mirror, and it is not round enough: the light output head is fixed and fixed. The lens is not aligned with the galvanometer, which causes a part of the light spot to be covered when the light passes through the galvanometer. There is another situation, that is, the galvanometer deflection lens is damaged, and when the received light beam passes through the damaged area of u200bu200bthe lens, it cannot be effectively reflected. Therefore, the laser energy of the laser beam passing through the damaged area of u200bu200bthe lens is different from that of the non-damaged area of u200bu200bthe lens, and the result is that the light energy 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 properties are changed: The raw materials are particularly sensitive to the reaction of light energy. 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 some other physical processes are not uniform enough.

5. The same horizontal plane of the machine and equipment is not aligned, that is, the photoconductor lens or the field lens lens and the production and processing table are not on the same horizontal plane: Since the two are not on the same horizontal plane, it will cause After passing through the field lens, the distance of the light beam reaching the production and processing items is inconsistent, and the result is that the energy of the light beam falling on the production and processing items will have different energy densities.