When optical fiber laser cutting machine is used to cut sheet metal materials, the products cut are not only of high precision and smooth section without burr, but also can achieve good results whether cutting thick plates or thin plates. However, these effects are related to the focus control of optical fiber laser cutting machine, so how to control them? Let's take a look today.
Those who have used optical fiber laser cutting machines know that when optical fiber laser cutting machines cut different materials and materials of different thicknesses, in order to achieve a certain cutting effect, the focus of the laser beam will be set in different places, which is called focusing.
In the early days when laser cutting was applied, focusing was mainly done by hand. Now, with the development of laser technology, this manual focusing method has been gradually eliminated, and the automatic focusing function has been gradually realized. Then, some people will say that the optical path is integrated in the cutting head. Isn't it possible to achieve focusing 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, the facts proved that it was not as simple as everyone imagined.
The bottom of the cutting head is the nozzle. During the cutting process, the distance between the nozzle and the workpiece is about 0.5~1.5mm, which can be regarded as a fixed value, that is, the nozzle height is unchanged, so the focus cannot be adjusted by lifting the cutting head.
The focal length of the focusing mirror is unchangeable, so it can not be expected to focus by changing the focal length. If you change the position of the focusing mirror, you can change the focus position. If the focusing mirror drops, the focus drops, and if the focusing mirror rises, the focus rises. This is really a way of focusing. Auto focusing can be realized by using a motor to drive the focusing mirror up and down.
With the auto focusing function, the machine can automatically adjust the focus to a proper position at a high speed when processing workpieces of different materials and thicknesses. This can significantly improve the processing efficiency of the fiber laser cutting machine, and the thick plate perforation time will be greatly reduced. Therefore, for optical fiber laser cutting machine, auto focusing function is an important and indispensable function.
Source: Haimu Star laser sheet metal equipment
