As we all know, laser cutting machine cutting sheet metal has incomparable advantages, it is not only high cutting accuracy, smooth cross-section without burr, whether cutting thick or thin plate can achieve good results, however, these effects are related to the laser cutting machine focus control, it is the principle of focusing and achieving better imaging effect with SLR camera. The laser cutting machine takes the laser emitted from the laser and focuses it into a high power density laser beam through the optical path system. The laser beam hits the surface of the workpiece and brings the workpiece to its melting or boiling point, while a high pressure gas coaxial to the beam blows away the molten or vaporized metal. Laser cutting machine with invisible beam instead of the traditional mechanical knife, with high precision, fast cutting, not limited to cutting pattern restrictions, automatic layout to save material, smooth kerf, low processing costs, etc., will gradually improve or replace the traditional metal cutting process equipment. Laser cutting machine recycling with the relative position of the beam and the workpiece to move, the final material to form a slit, so as to achieve the purpose of cutting.
So, what is focus control? Those who are familiar with laser cutting machine know that laser cutting machine in different materials and different thickness of the plate, in order to achieve a better cutting effect, the focus of the laser beam will be set in different places, this is what we call focus.
In the early days of laser cutting applications, the main focus is dependent on a manual mode to complete, and now with the development of laser technology, in the manual focus mode has been eliminated, automatic focus began to be achieved, such as the full range of laser cutting machine is equipped with automatic focus function. So, some people will say that are integrated in the cutting head within the optical path, by changing the height of the cutting head, but still not focusing function can be achieved? 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 truth is that we did not imagine such a simple one.
The bottom of the cutting head is the nozzle, and during the cutting work, the distance between the nozzle and the workpiece material (nozzle height) is about 0.5 to 1.5mm, which may be regarded as a fixed value, i.e. the nozzle height develops unchanged, so we can't focus by controlling the lifting and lowering of the cutting head at the same time (otherwise the company can't finish the cutting technology processing in time).
The focal length of the focusing mirror does not change, so you can not expect to focus by changing the focal length. The focal position can be changed if the focal position of the reflector is changed: the focusing lens will be lowered at the drop of the focal point, and the focusing lens will be increased at the increase of the focal point when the focusing lens is increased. mdash;mdash;This is really one way of focusing. Auto-focus is achieved using a focusing lens drive motor for moving up and down.
Another way to automatically focus is to place a variable curvature reflector (or adjustable mirror) before the beam enters the social focus mirror, and by constantly changing the curvature of the reflector, the angle of the reflected beam is changed to disperse the student, thus being able to change the main position of the corporate focus.
With automatic focus function, the machine can automatically focus to the most suitable position when processing different materials and thickness of the workpiece. This can significantly improve the processing efficiency of the laser cutting machine, thick plate perforation time will be greatly reduced.
Therefore, for laser cutting machine, the auto-focus function is an important and indispensable feature.