UV laser marking machine, when the laser is used to process the etching and marking process on the glass, requires a high energy density. However, if the energy density is too high, there will be cracks and even edge collapse. If the energy density is too low, it will lead to the sinking of the marked points or the inability to directly etch on the surface, so it is difficult to process. Let's learn about the processing technology of UV laser marking machine.
UV laser marking machine marks on flat glass, which is directly related to laser peak power, focusing spot size and galvanometer speed. Sometimes the light of high power laser will pass through without etching on the glass surface. This is because the peak power of the laser is not enough or the energy density is not concentrated enough.
The peak power is affected by the laser crystal, pulse width and frequency. The narrower the pulse width, the lower the frequency, the higher the peak power of the laser. We only need to change the scanning speed of the galvanometer to an appropriate value to obtain better processing results. However, it should be noted that the scanning speed is also affected by the frequency of the laser itself. If the frequency is too low, it will also lead to leakage.
When marking on curved glass, ultraviolet laser is affected by curved surface, and the focus depth of the focus spot and the scanning mode of the galvanometer are particularly important to the processing effect, that is, affected by the laser peak power, the focus spot, the scanning speed of the galvanometer, the scanning mode of the galvanometer, the focal depth of the spot and the range of the field mirror. When the energy density reaches the standard, we will find that the effect on the glass surface is worse as it moves towards the edge, and even cannot be processed on the surface. The reason is that the focal depth is too shallow.
Therefore, the process of UV laser marking machine for processing glass is analyzed. For curved glass, which has a larger range and higher hardness, the laser with higher UV beam quality and power and narrow pulse width should be selected, which is more suitable for processing such parts than the laser and galvanometer independently developed by the laser.
