Why Used Autofocus Laser Head for Fiber Laser Cutting Machine
Why Used Autofocus Laser Head for Fiber Laser Cutting Machine
In the application of laser cutting early, focusing relies on manual. Nowadays, with the development of laser technology, manual focusing will eventually be eliminated, and the automatic focusing function will be explored. For example, high-performance high-speed fiber laser cutting machine have high-efficiency full-automatic focusing function. Then, some people will say that the light path is integrated into the cutting head. Can't we simply change the laser height? 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 is not as simple as you think.
The bottom of the cutting head is the nozzle. In the cutting process, the distance between the nozzle and the workpiece (nozzle height) is about 0.5 ~ 1.5mm, which can be regarded as a fixed value, that is, the nozzle height remains unchanged, so it can not be focused by lifting the laser head.
The focus can not be changed by focusing the lens.If the position of the focus lens is changed, the focus position will be changed accordingly: if the focusing mirror drops, the focus will drop; if the focusing mirror rises, the focus will rise.--This is really a way of focusing.A motor is used to drive the focus lens to move up and down, which can realize automatic focusing. Another method of auto focusing is to set a variable curvature mirror (or adjustable mirror) before the beam enters the focusing mirror. By changing the curvature of the mirror, the divergence angle of the reflected beam and the focus position are changed. With the auto focus function, the machine can automatically adjust the focus to the right position by numerical control when processing workpieces of different materials and thicknesses.The high-speed cutting time of the machine tool can also be greatly reduced.
Therefore, for high-speed laser cutting machine, auto focusing function is an important and indispensable function.
