Many people who bought a laser cutting machine do not know how to adjust the focal length. Now I will share the method of adjusting the focal length of the laser cutting machine, hoping to help everyone.
The first method: Press the "Shot" button to determine the focal length according to the size of the light, so that the light at the focus of the laser cutting machine is the smallest. In other words, when the spot is the smallest, it can be considered as the optimal height of the laser head when cutting objects.
That is to say, put the object under the laser head and adjust the height of the laser head. When the laser head is at different heights, press the "Shot" button to observe the size of the light spot. You can first adjust the position of the laser head to be more obvious. , the smaller the spot. Light spot and find the height area of the laser head, and then make fine adjustments. When the light spot is the smallest, it can be considered as the area where you want to adjust the height of the laser head. It can be assumed that you want to adjust the position of the laser head.
The second way: the laser cutting machine is used as the focus of the laser, and its light intensity is the strongest. The depth of the laser hitting the object determines the position of the focus, and self-checking is performed accordingly.
That is, put the object under the laser head, and adjust the position and height of the laser head. When the drawing depth is the deepest, press and hold the "Position" button for more than 3 seconds, which can be regarded as the highest height of the laser head. In other words, you have to adjust the height of the laser head.
The above are the general terms for determining the focus position of the laser cutting machine. Then, when cutting different workpieces and different materials, the focus position of the laser cutting machine will be different. The following is the relationship between the focus position of the laser cutting machine and the material.
First, "focus cutting" focuses on the surface of the workpiece. Laser cutting machines are used to cut stainless steel, galvanized steel and other workpieces. Since the focus is on the top surface of the workpiece, it will cut smoothly near the top surface, but not near the bottom surface.
The second is a positive focal length, where the focus is inside the workpiece. This method is suitable for cutting stainless steel and aluminum. Because the focus is in the center of the workpiece, the area of the smooth surface is larger, the cutting width is wider than at zero focal length, the cutting gas flow is larger, and the drilling time is longer than at zero focal length.
Third, remove the focus. The focus is on the workpiece. Cutting thick steel plates with a laser cutter breaks the use of this method. The top-to-bottom surface must have been cut by the thick steel plate and the oxidizing action of oxygen. Because the plate is thicker and the cutting width is wider, the cutting width can be set wider. It can be said that it is the same as gas cutting, but because the oxygen is blown away, the cut surface will be rougher.
The above is the method of adjusting the focal length of the laser cutting machine.
English 
Chinese