How to adjust the focal length of CNC laser cutting machine?

　　For a CNC laser cutting machine, how to adjust the focal length is very important, which is directly related to the cutting accuracy and work efficiency of the laser cutting machine. Therefore, we need to figure this out to help you carry out smooth production work!

　　CNC laser cutting machine How to adjust the focal length?

　　 Generally speaking, the focus of the laser cutting machine is to focus the beam. The focus is adjustable rather than fixed, some are autofocus, some are manual focus. However, although different lenses have focal lengths, most of them have very small differences.

　　To determine the focal length, you need to focus first. It finds the focal point of the lens during processing and adjusts the focal length according to the actual quality. The focal length of the focusing lens of each laser cutting machine is different. The focal length of the focusing lens of the existing small laser engraving machine is 50.8MM and 63.5MM, which is the distance between the focusing lens and the material. You can measure the height of the lower lens with a steel ruler. Generally use 50.5# focus lens for cutting and 63.5# focus lens for engraving! 50.5# focal length is about 6CM, 63.5#8-10CM.

　　Knowledge expansion: Why are the parts cut by the CNC laser cutting machine sometimes deformed?

　　 First, check whether it is caused by improper dimming of the equipment. Secondly, focus on the raw materials used for cutting. The reflection and metal characteristics of the raw materials will affect the cutting effect. When cutting thin metal plates, laser cutting is thermal cutting, and thermal cutting is bound to be deformed. Compared with flame cutter and plasma cutter, the deformation is relatively small. However, there are still differences. The size of the difference has a lot to do with the material being cut, the shape of the part, the thickness of the cut, and the laser processing technology. The shape of the part determines the size of the cut. For example, if you cut a square, the thermal strain will not be too great. However, if you cut a slender rectangle (10*2000mm), the deformation must be great. The reason for the deformation is thermal expansion and contraction caused by uneven heating, which changes the switch.

The first prerequisite for 　　 CNC laser cutting machine to adjust the focal length is to focus first. The focal length of the focusing lens of each laser cutting machine is different, and it needs to be adjusted according to the actual production. In addition, if parts are found to be deformed during the cutting process, it may be caused by improper dimming, or it may be related to the material and shape of the product itself.

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