When the fiber laser cutting machine cuts plates of different thicknesses, in order to achieve a better cutting effect, the focus of the fiber laser beam should be set in different places. In the early application of fiber laser cutting machine, due to the limitation of functions, the fiber laser cutting head did not have an automatic focusing function, and it could only be manually adjusted manually.

 

With the gradual maturity of laser technology, the fiber laser cutting head with automatic focusing function came out, which changed the traditional manual focusing mode. Many customers who buy fiber laser cutting machines for the first time will ask a question, what is the difference between auto focus and manual focus? This post introduces them to you.

 

For manual laser cutting head, if the sheet metal thickness is different, the focal length will also be different. That is, when you change from cutting 5mm sheet metal to 6mm, you need to manually adjust the focus to complete the cut. In this way, every time a sheet of different thickness is replaced, the height of the laser head needs to be adjusted to find the correct focal length, which will waste some focusing time, resulting in longer cutting time.

On the other hand, manual focusing requires a higher level of skill for the laser machine operator, because if errors occur during the focusing process, it will have an impact on the accuracy and production efficiency of the machine.

 

The autofocus laser cutting head has a built-in power drive unit, and the user can set the program to achieve continuous focusing and complete rapid perforation and cutting of materials with different thicknesses. With the auto-focusing laser head, you only need to find the focus for the first cut, and then when you cut again, the laser head will sense the thickness of the metal sheet and automatically adjust the height to find the appropriate focal length.

 

When the laser cutting head is cutting metal, the height of the nozzle cannot be changed, that is, the height of the nozzle does not change, so it cannot be focused by raising the cutting head.

The height of the nozzle cannot be changed, and the focal length of the focusing mirror cannot be changed, so only the position of the lens can be changed, the focusing lens is lowered, and the focus is lowered; if the focusing lens is raised, the focus will be raised. Through this principle, the motor is used to adjust the position of the focusing lens up and down to achieve automatic focusing.

Another automatic focusing method is to set a variable curvature mirror before the beam enters the focusing mirror, and change the divergence angle of the reflected beam by changing the curvature of the mirror, thereby changing the focusing position.

 

Through the autofocus function, the fiber laser cutting machine can automatically and quickly adjust the focus to the most suitable position when processing metal plates with uneven surfaces. In this way, the cutting effect of the machine can be significantly improved, and the perforation time of thick plates can also be greatly shortened.

 

Autofocus laser heads have more advantages than manual focus, so they are more expensive. But if the power of your fiber laser cutting machine is below 1500W, the manual laser head can meet your needs. From 1500W, we have equipped a high-power fiber laser cutting machine with an auto-focus laser head, which will help you cut metal materials quickly.