The reason of uneven marking of fiber laser marking machine

Nowadays, fiber laser marking machine is becoming more and more popular in the industry. It has gradually replaced the traditional marking technology. In the future, laser technology will become more common. And it will usher in the era of popularization of laser, occupying an important position in the industry. The machine has been used for a long time, and there will always be some small problems, so what is the reason for the uneven marking effect?

Fastly find out the cause of uneven marking of the fiber laser marking machine:

The use of optical fiber laser marking machine to mark a certain range of content

Because each focusing lens has a corresponding depth of focus range, and the use of off-focus methods can easily lead to a large range of marking patterns. The edges are at the critical depth of focus depth or beyond the depth of focus range, so it is easier to cause effects. Uniformity. Therefore, the method of defocus marking must consider the problem of laser beam.

Second, the laser output spot of the fiber laser marking machine is blocked.

that is, the laser beam passes through the galvanometer and field lens, and the spot is lacking, and the laser output head, fixing fixture and galvanometer are not round enough. Part of the light spot is blocked. After focusing by the field lens, the light spot on the frequency doubling film is non-circular, which may also cause uneven effects.

There is also a case where the galvanometer deflection lens is not good, and when the laser beam passes through the damaged area of ​​the lens, it cannot reflect well. Therefore, the laser beam passing through the damaged area of ​​the lens is inconsistent with the laser beam in the non-damaged area of ​​the lens. And the laser beam that eventually acts on the material is also different, so that the marking effect is uneven.

A brief analysis of the reasons for the uneven marking effect of the fiber laser marking machine

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 density acting on the material. Will change due to the thermal lens phenomenon, resulting in uneven marking effect.

The level of the fiber laser marking machine did not adjusted properly. That is, the laser vibration 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.If the laser falls on the processed object, the laser beam density will be inconsistent. .

Reasons for marking materials by fiber laser marking machines, such as inconsistent film thickness on the surface of the material or changes in physical and chemical properties

Usually under the same material, it is certain that the laser reaches the material damage 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.

If any info you need, please let us know.

Lisa wang, sales manager

Mob/whatsapp: 008615954124625

Email: lasermachine02@xtlaser.com