High precision and high accuracy is the survival way of metal laser cutting machine. If the cutting accuracy of a metal laser cutting machine cannot reach, it will not work. At present, the problems of domestic metal laser cutting machines are basically reflected in the problem of focus. What are the good methods to improve the cutting accuracy of laser cutting machines and accurately adjust the focus of metal laser cutting machines?
The first is the inclined plate method of adjusting the focus of the metal laser cutting machine, that is, the plastic plate placed at an angle to the vertical axis is used to pull it horizontally to find the minimum point of the laser beam of the metal laser cutting machine as the focus.
Next is the printing method of adjusting the focus of the metal laser cutting machine, that is, let the cutting head of the metal laser cutting machine move from top to bottom, and print the laser beam on the plastic plate, with the smallest printing diameter as the focus.
Secondly, it is more troublesome to adjust the focus of the metal laser cutting machine is the collimator method. Although it is troublesome, it is also a commonly used method, that is, add a collimator at the output end of the metal laser cutting machine for beam expansion. After beam expansion, the beam diameter becomes larger and the divergence angle becomes smaller, so that the beam size of the near end and the far end is close to the same before focusing within the cutting working range. An independent lower axis of the moving lens is added to the cutting head. The metal laser cutting machine and the Z axis that controls the distance between the nozzle and the material surface are two independent parts. When the worktable of the machine tool moves or the optical axis moves, the F-axis of the beam from the near end to the far end also moves at the same time, so that the spot diameter remains the same in the whole processing area after the beam is focused.
Finally, the blue spark method of adjusting the focus of the metal laser cutting machine is to remove the nozzle of the cutting head of the metal laser cutting machine, blow air, hit the laser on the stainless steel plate, and make the cutting head move from top to bottom until the maximum blue spark is the focus. In this way, the focal point can be calculated. In the later cutting process, the corresponding focusing can be taken according to the different thickness of the plate.
For the cutting machine of flying light path, due to the divergence angle of the beam, the length of the near end and far end of the cutting is different, and the beam size before focusing is different. The larger the diameter of the incident beam, the smaller the diameter of the focal spot. Aligning the focus of the metal laser cutting machine is equivalent to improving the working efficiency of the metal laser cutting machine, and further speaking, improving the production efficiency of the whole enterprise.