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Reasons for uneven marking of laser marking machine


是最简单最容易操作的设备,其实不然,在实际应用的过程中如何根据客户的产品特性打标出最佳的效果是每个激光打标机操作人员必备的技术,下面 In the current laser equipment market, we generally believe that laser marking machines are the simplest and easiest to operate equipment. In fact, otherwise, how to mark the best results according to the characteristics of customers' products in the actual application process Essential skills for operators, below Introduce several reasons for uneven printing during laser marking.

I. Marking a certain range of content with off-focus

Because each focusing lens has a corresponding range of focal depth, and the use of off-focus methods can easily lead to a large range of marking patterns, the edge is at the critical depth of focal depth or beyond the focal depth range, so it is relatively easy to cause effects. Uniformity. 能量的问题。 Therefore, the method of defocus marking must consider the problem of laser energy.

Second, the laser output light spot is blocked, that is, the laser beam passes through the galvanometer and field lens, the light spot is lacking, and is not round enough

The laser output head, fixed fixture, and galvanometer are not adjusted properly, which causes part of the light spot to be blocked when the laser passes through the lens. The light spot on the frequency multiplier after focusing by the field lens is non-circular, which may also cause the effect to be ineffective. Even.

There is also a case where the galvanometer deflection lens is damaged, and when the laser beam passes through the damaged area of the lens, it cannot be reflected well. 经过镜片损伤区域与镜片无损伤区域激光能量有不一致,最终作用在材料上的激光能量也不一样,从而使标刻效果不均匀。 Therefore, the laser energy passing through the damaged area of the lens is inconsistent with the laser energy of the non-damaged area of the lens, and the final laser energy acting on the material is also different, thereby making the marking effect uneven.

Third, the thermal lens phenomenon

When the laser light passes through the optical lens (refraction, reflection), it will cause the lens to generate slight deformation. This deformation will increase the laser focusing focus and shorten the focal length. If the machine is fixed, when the distance is adjusted to the focal point, after turning on the laser for a period of time, the laser energy density acting on the material will change due to the thermal lens phenomenon, resulting in uneven marking effect.

Fourth, the machine level is not adjusted properly, that is, the laser lens or field lens is not parallel to the processing table

Because the two are not horizontal, the distance between the laser beam and the processed object after passing through the field lens will be inconsistent. Finally, the energy of the laser falling on the processed object will have an inconsistent energy density. At this time, the effect will be shown on the material Uneven.

V. Material reasons, such as inconsistent film thickness on the surface of the material or changes in physical and chemical properties

The material is more sensitive to laser energy response. Usually under the same material, it is certain that the laser energy reaches the material destruction threshold. When the thickness of the material coating is different, or some other physical and chemical treatment processes are not uniform, the effect of laser marking will also be uneven.

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