In the early application of laser cutting, the main way of focusing is to rely on manual. Now with the development of laser technology, this way of manual focusing has been gradually eliminated, and the automatic focusing function has been gradually realized. All series of laser cutting machines of the advanced laser companies are equipped with the full automatic focusing function. The optical path is integrated in the cutting head. Can't the focusing function be realized by changing the height of the cutting head?
When the cutting head is raised, the focus position is high, and when the cutting head is lowered, the focus position is low. However, it turns out that it's not as simple as you think. The bottom of laser cutting head is nozzle. In the cutting process, the distance between nozzle and workpiece (nozzle height) is about 0.5-1.5mm, which can be regarded as a fixed value, that is, the nozzle height is not changed, so the focus can not be adjusted by lifting the cutting head (otherwise, the cutting process cannot be completed). The focal length of the focusing mirror cannot be changed, so we can't expect to focus by changing the focal length.
If the position of the focus mirror is changed, the focus position can be changed: if the focus mirror is down, the focus will be down, and if the focus mirror is up, the focus will be up. ——This is really a way of focusing. A motor is used to drive the focusing mirror to move up and down to realize automatic focusing.
Another method of automatic focusing is: before the beam enters the focusing mirror, set a variable focus collimator group (or adjustable mirror) to change the focus position by changing the focal length of the collimator and the divergence angle of the reflected beam. With the auto focus function, the machine can automatically adjust the focus to the most appropriate position when processing workpieces of different materials and thicknesses. In this way, the processing efficiency of laser cutting machine can be significantly improved, and the perforation time of thick plate can be greatly reduced.
Therefore, for laser cutting machine, auto focus function is an important and indispensable function.
Wanshunxing optical fiber auto focusing Cutting Head NC30
1. This cutting head has a strong advantage in the application of medium power and large format fiber laser cutting.
2. The inner structure of the laser head is completely sealed, which can prevent the optical part from being polluted by dust.
3, the laser head uses two to middle adjustment, focusing is driven by imported motor, and the efficiency of perforation is significantly improved.
4. The protective lens is installed in drawer type, which is convenient for replacement.
5. It can be equipped with various QBH connector lasers.