Solution to uneven marking of fiber laser marking machine

With the popularity of fiber laser marking machines, fiber laser marking machines are widely used in integrated circuit chips, computer accessories, hardware tools, molds, home appliances, jewelry and other industries. The equipment not only has good beam quality, but also The life of the whole machine is about 100,000 hours, and it has outstanding performance in energy saving and environmental protection.

In the process of using the fiber laser marking machine, there will be some small problems more or less, such as uneven marking effect, how can we solve it, According to the guidance of the professional and technical personnel of Harmony Tianyu, the uneven marking effect of the fiber laser marking machine is nothing more than the following five reasons.

1. The content of a certain range is marked with partial focus

Each focusing lens has a corresponding depth of focus range , and the application of the off-focus method will easily lead to a large-scale marking pattern, and the edge is at the critical point of the depth of focus or beyond the range of the depth of focus, which is more likely to cause unevenness in the effect.

Solution: When using the off-focus marking method, the problem of laser energy should be considered, and the marking pattern should not be at or beyond the critical point of the focal depth range during operation.

2. Material reasons

The material is more sensitive to the laser energy response, usually under the same material, the laser energy reaches The material damage threshold is certain. However, if the coating thickness of the material is different, or some other physical and chemical treatment processes are not uniform enough to cause changes in the physical or chemical properties of the material surface, it will also cause unevenness in the effect of laser marking.

Solution: Careful material selection, consistent surface coating thickness, and uniform surface physical and chemical treatment

3. Laser output spot Blocked or the galvanometer deflection lens is damaged

If the laser output head, fixing fixture and galvanometer are not adjusted in advance, part of the light spot will be blocked when the laser passes through the galvanometer. If the laser beam is focused by the field lens, the spot on the frequency doubling plate is non-circular, which will lead to uneven marking effect.

If the galvanometer deflection lens is damaged, when the laser beam passes through the damaged area of u200bu200bthe lens, the laser beam will not be well reflected. Therefore, the laser energy of the laser beam passing through the damaged area of u200bu200bthe lens and the non-damaged area of u200bu200bthe lens will be inconsistent, and the final laser energy acting on the material will be different, resulting in uneven marking effect.

Solution: Adjust the laser beam output head, fixing fixture and galvanometer in advance; protect the galvanometer lens, and contact the corresponding personnel immediately for replacement if it is damaged.

Fourth, the laser galvanometer lens or field lens lens and the processing table are not parallel

If the two are not at the same level, it will cause The distance between the laser beam and the object to be processed after passing through the field mirror is inconsistent, and the final energy of the laser falling on the object to be processed will have a non-uniform energy density, and the performance on the material is the uneven marking effect.

Solution: Adjust the machine level in advance, and make the laser galvanometer lens or field lens lens parallel to the processing table.

5. Thermal lens phenomenon

When the laser is refracted or reflected through the optical lens, the lens will heat up subtle deformation. This deformation will raise the focus of the laser and shorten the focal length.

If the machine is fixed and the distance is adjusted to the focal point, after the laser is turned on 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.

Solution: Pay more attention to daily use. Once the lens is deformed, no matter how small the error is, it should be replaced immediately.

Fiber laser marking machine has a very wide range of applications, but in the long-term use process, due to insufficient maintenance, it may affect the marking effect. It is very important to pay attention to maintenance and correct use.

(This article is edited by the editor, please be sure to indicate the source:)

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