Views: 11 Author: Site Editor Publish Time: 12-29-2021 Origin: Site
In the process of using the laser cutting machine, when the optical elements (such as processing lens, PR mirror or window, etc.) through which the laser beam of the laser cutting machine passes are stained, the thermal lens effect will occur after the laser beam passes, and the cutting surface will be changed accordingly. Rough, dross will appear, and even overburn will occur. So, what should I do if the thermal lens effect occurs during laser cutting? Leapion laser shares are as follows:
1) Laser output head: check and clean before installation;
2) Combining lens: You can choose a combining lens with a red laser, or you can replace a good quality combining lens;
3) Field lens: clean the lens of the field lens, or replace the quartz material field lens;
4) If you are using a collimator: clean the collimating lens, or replace it with a good quality collimator.
1) Laser output head: check and clean before installation;
2) Upper protective lens: clean the lens, or replace with a good quality lens;
3) Collimating lens group: clean the lens, or replace the good quality lens;
4) Focus lens group: clean the lens, or replace with a good quality lens;
5) Lower protection lens: clean the lens, or replace with a good quality lens.
During the laser cutting process, for reflective optical elements, efficient cooling can be done directly from the back side, and there are few such optical elements, and no thermal effects will occur, so this kind of light-transmitting optics Components can only be continuously and gradually cooled by cooling the environment around them.
Both surfaces of optical elements generate heat, and it is easy to produce a thermal lens effect. Relatively speaking, their temperature will definitely produce some thermal deformation when their temperature rises. Therefore, this kind of laser cutting processing mode is much more. Less changes in refractive index will also occur.
At the beginning of processing, due to the short irradiation time of the laser beam, the optical element is still in a low temperature state, so the influence of the thermal lens effect is relatively small. At the end of the processing where the cutting time requires more than 10s, because the optical element is irradiated by the laser beam for a long time, a thermal lens effect will occur, and the focus position and beam pattern will also change.
Once the focus position changes or the beam pattern changes, it will not automatically return to the original state during continuous irradiation processing. Comparing the cutting surface at the beginning of processing and the end of processing, the quality at the end of processing becomes worse. It means that the thermal lens effect has occurred; if the quality of the two places is in the same degree of good condition, it means that the thermal lens effect has not occurred.
At this time, we need to observe the slagging conditions at the beginning and end of the processing. If the amount of burrs at the processing place increases, it means that a thermal lens effect may have occurred. In addition, in order to eliminate the directivity caused by other reasons such as the inhomogeneity of the beam pattern or the tilt of the optical axis, it should be noted that the cut surface (same processing direction) must be selected for comparison.
For more professional questions about laser cutting machines, welcome to consult Leapion Laser.
