Views: 27 Author: Site Editor Publish Time: 08-16-2021 Origin: Site
With the continuous development of laser technology, the laser cutting machine has played an unparalleled advantage in cutting metal plates. It not only has high cutting accuracy, but also has a smooth section without burrs. It can achieve good results whether it is cutting thick or thin plates. However, these cutting effects are closely related to the focus control of the laser cutting machine, just like the focus adjustment of a SLR camera. It is a principle that the focus can achieve a better imaging effect. In the initial application of laser cutting, focusing mainly relied on manual. However, with the continuous development of laser technology, manual focusing will eventually be eliminated and replaced by the automatic focusing function. Why does the laser cutting machine need to be equipped with automatic focusing function？ Leapion Laser tells you.
Focus control means that when the laser cutting machine cuts different materials and different thicknesses of plates, in order to present a perfect cutting effect, the focus of the laser beam will be set in different places, which is what we call focusing.
One of the advantages of laser cutting is that the energy density of the beam is high, so the focal spot diameter will be as small as possible in order to produce extremely tiny slits. Because the smaller the focal depth of the focusing lens, the smaller the diameter of the focal spot. For high-quality, high-precision cutting, the effective focal depth is also related to the lens diameter and the material to be cut, so it is very important to control the position of the focus and the surface of the material to be cut.
In the early days of laser cutting applications, the main method of focusing was done manually. Now with the development of laser technology, this manual focusing method has been gradually eliminated, and the automatic focusing function has been slowly realized. For example: Leapion Laser's full range of laser cutting machines have been equipped with fully automatic focusing functions.
So, some people will say that the optical path is integrated in the cutting head, can the focusing function be realized by changing the height of the cutting head？ When the cutting head is raised, the focal position is higher, and when the cutting head is lowered, the focal position is lower. However, it turns out that it is not as simple as everyone thought.
Because the bottom of the cutting head is a nozzle, during the cutting process, the distance between the nozzle and the workpiece （nozzle height） is about 0.5~1.5mm. It may be regarded as a fixed value, that is, the nozzle height does not change, so it cannot be lifted and lowered by the laser head. focusing.
1. Changing the position of the focusing lens will change the focus position accordingly: if the focusing lens goes down, the focus will go down； when the focusing lens goes up, the focus will go up. This is indeed a way of focusing. A motor is used to drive the focusing lens to move up and down to achieve automatic focusing.
2. Another method of automatic focusing is to place a variable curvature mirror （or adjustable mirror） before the beam enters the focusing lens, and change the divergence angle and focus of the reflected beam by changing the curvature of the mirror. Location.
With automatic focusing function, when processing workpieces of different materials and different thicknesses, the machine can automatically and quickly adjust the focus to a suitable position through numerical control. Therefore, the processing efficiency of the laser cutting machine can be significantly improved, and the perforation time of the thick plate can be greatly reduced.
It can be seen that for the laser cutting machine, the automatic focusing function is an important and indispensable function. If you want to know more about the professional problems of laser cutting machine, welcome to consult Leapion Laser.
