The metal optical fiber laser cutting machine has unparalleled advantages in cutting metal plates. It not only has high cutting precision, but also has smooth section and no burr. Whether cutting thick plates or thin plates, metal optical fiber laser cutting machine can always achieve a good cutting effect. However, these good cutting effects are closely related to the focusing control of metal optical fiber laser cutting machine. It has the same focusing principle as the SLR camera and can achieve better imaging effect.

When the optical fiber laser cutter cuts plates of different materials and thicknesses, in order to achieve better cutting effects, the focus of the optical fiber laser beam should be set at different places.

In the initial application of metal optical fiber laser cutting machine, manual focusing is the main method to adjust focusing. With the rapid development of fiber laser technology, this manual focusing mode has been gradually eliminated, and the automatic focusing function has been widely used. For example, Chuyu Optoelectronics' all series of metal optical fiber laser cutting machines are equipped with full automatic focusing function. Then, maybe someone will say that the light path has been integrated in the cutting head, can the focusing function be realized by changing the height of the cutting head? When the fiber laser cutting head is raised, the focus position is higher; When the fiber laser cutting head is lowered, the focus position is lower. In fact, this is not the case. The bottom of the fiber laser cutting head is the cutting nozzle. During laser cutting, the distance between the cutting nozzle and the workpiece (nozzle height) is about 0.5-1.5mm. We take 0.5-1.5mm as a fixed value, that is, the height of the optical fiber laser cutting nozzle remains unchanged, so it is impossible to adjust the focus by lifting the optical fiber laser cutting head of the metal cutting machine.

How to realize automatic focusing of laser cutting machine?

The focal length of the focusing lens cannot be changed, so the focal length of the metal fiber laser cutter cannot be adjusted by changing the focal length. However, if you change the position of the focus lens, you can change the position of the focus: when the focus lens drops, the focus drops; When the focus lens rises, the focus rises. This is indeed a way to adjust the focus of metal laser cutting machine optical fiber laser cutting machine. The motor is used to drive the focusing lens to move up and down to realize the automatic focusing of the metal optical fiber laser cutting machine.

Another method of automatic focusing is to set a variable curvature mirror (or adjustable mirror) before the beam enters the focusing mirror, and then change the divergence angle of the reflected beam by changing the curvature of the mirror, thus changing the focus position.

The metal optical fiber laser cutting machine has the automatic focusing function, which can automatically adjust the focusing to the most appropriate position when processing workpieces of different materials and thicknesses. In this way, the processing efficiency of the metal fiber laser cutting machine can be greatly improved, and the perforation time of the thick plate can be greatly reduced.

Therefore, for the metal optical fiber laser cutting machine, the automatic focusing function is an important and indispensable function.