Focal adjustment effect on cutting quality

Due to the power density had a great influence on cutting speed, lens focal length selection is an important problem. After focusing beam spot size is directly proportional to the lens JiaoChangCheng, after short focal length lens to focus the light beam spot size is small, the focus in high power density, the material cutting is strong; But its drawback is that the depth is very short, adjust the margin is small, is generally applicable to the high speed cutting thin materials. Due to the long telephoto lens has a wide depth of focus, as long as have the enough power density, suitable for cutting thick artifacts.

in determining which coke after long lens, focus and relative position to ensure the quality of cutting on the surface of the workpiece is particularly important. Because of the focus in high power density, in most cases, the focus position just in cutting the workpiece surface, or slightly below the surface. In the whole cutting process, to ensure focus and workpiece position relatively constant is important condition to obtain the stable cutting quality. Sometimes, lens work because of poor cooling and heat causing focal length change, it's need to adjust the focus position.

when focus is in a better position, less slot and higher efficiency, better cutting speed can be obtained better cutting results. Applied in most cases, the light beam focus to just under the nozzle. About 5 mm.