Liaocheng Keju Laser Equipment Co., Ltd. is a professional laser equipment manufacturer. It is a high-tech enterprise specializing in laser engraving machines, laser cutting machines, laser cutting machines, laser marking machines, bearing engraving machines and other laser equipment in the field of lasers in China.
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What are the reasons for the uneven marking effect of fiber laser marking machines?
First, the use of eccentric focus marking a certain range of content
Because each focus lens has a corresponding depth of focus range, the use of off-focus approach can easily lead to a wide range of marking patterns, the edge of the focus depth of the focal point or beyond the depth of focus range, which is more likely to cause the effect is not Uniformity. Therefore, the method of defocusing marking must consider the issue of laser energy.
Second, the laser output light spot is blocked, that is, the laser beam passes through the galvanometer and the field lens.
Laser output heads, fixtures and galvanometers are not adjusted well, resulting in partial light spots being blocked when the laser passes through the vibration lens. After the field lens focuses, the light spot on the frequency doubler is non-circular, which may also lead to no effect. Uniform. The
There is also a case where the galvanometric 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 beam has inconsistent laser energy through the damaged area of the lens and the non-damaged area of the lens, and the laser energy ultimately acting on the material is also not the same, so that the marking effect is not uniform.
Third, thermal lens phenomenon
When the laser passes through the optical lens (refracting, reflecting), it will cause the lens to heat and produce a fine deformation. This distortion will cause the focus of the laser to rise and the focal length to become shorter. 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. The
Fourth, the level of the machine is not adjusted well, that is, the laser lens or field lens is not parallel to the processing table
Because the two are not horizontal, it will lead to the inconsistence of the distance between the laser beam and the processed object after passing through the field lens. Eventually, the energy of the laser beam falling on the processed object will have inconsistent energy density, and the effect will be exhibited on the material at this time. Uneven. The
V. Material reasons, such as inconsistent film thickness on the surface of the material or changes in physical and chemical properties
Materials are more sensitive to laser energy reactions. In general, under the same material, the laser energy reaches the material damage threshold is certain. When the material coating thickness is different, or there are some other physical and chemical treatment process is not uniform enough, it will also cause the uneven effect of laser marking.