Reasons for uneven marking effect of fiber laser marking machine

With the rapid development of my country's market economy, people's living standards have been greatly improved, and people's requirements for daily necessities are getting higher and higher. Therefore, manufacturers have higher and higher processing requirements for craftsmanship, and laser marking technology as the current Leading high-tech has always been a key technology promoted by the country. It has played a great role in today's Chinese manufacturing industry. Compared with traditional processing technology, fiber laser marking machine is operated by computer, which is simple and convenient to operate. It can meet the customized processing of various products, and can realize assembly line production.

Reasons for uneven marking effect of fiber laser marking machine

Why are fiber laser marking opportunities so popular? Fiber laser marking machine can be said to be the most widely used laser equipment today, because its technology is mature, its performance is stable, its price is relatively favorable, its processing speed is fast, the marking surface is smooth and flat, no subsequent processing is required, its deformation is small, and its processing accuracy is small. High, repeatability, no burr and other characteristics, and can edit any graphics to complete the marking, but also greatly reduce the company's processing cost (the price of laser marking machine). Fiber laser marking machines have been used in major industries, and the applicable industries are also very wide. As for the machine, there will always be some abnormal failures, so today I will share a 30-second quick understanding of the reasons for the uneven marking effect of the fiber laser marking machine.

What are the reasons for the uneven marking effect of fiber laser marking machine?

1. Use off-focus to mark a certain range of content

Because each focusing lens has a corresponding focal depth range, and the defocusing method will easily lead to a large-scale marking pattern, the edge is at the focal depth critical point or beyond the focal depth range, which is more likely to cause inconsistencies in the effect. uniformity. Therefore, the method of off-focus marking must consider the problem of laser energy.

2. The laser output spot is blocked, that is, after the laser beam passes through the galvanometer and the field mirror, the spot is missing and not round enough.

The laser output head, fixing fixture and galvanometer are not adjusted properly, which causes part of the light spot to be blocked when the laser passes through the galvanometer. evenly.

There is also a situation that the galvanometer deflection lens is damaged, and when the laser beam passes through the damaged area of ​​the lens, it cannot be reflected well. Therefore, the laser energy of the laser beam passing through the damaged area of ​​the lens is inconsistent with that of the non-damaged area of ​​the lens, and the final laser energy acting on the material is also different, so that the marking effect is uneven.

Briefly analyze the reasons for the uneven marking effect of fiber laser marking machine

3. Thermal Lens Phenomenon

When the laser passes through the optical lens (refraction, reflection), it will cause the lens to heat up and cause slight deformation. This deformation will raise the focus of the laser and shorten the focal length. If the machine is fixed, when 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.

4. The level of the machine is not adjusted properly, that is, the laser galvanometer or field lens is not parallel to the processing table

Since the two are not level, the distance between the laser beam and the object to be processed will be inconsistent after passing through the field lens. Finally, the energy of the laser falling on the object to be processed will have inconsistent energy density, which will show the effect on the material. uneven.

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

Materials are sensitive to laser energy. Usually under the same material, the laser energy reaches a certain material damage threshold. When the thickness of the material coating is different, or some other physical and chemical treatment processes are not uniform enough, it will also cause unevenness in the effect of laser marking.