How to accurately adjust the focus of a metal laser cutting machine?

High precision and high accuracy are the way to survive as a metal laser cutting machine. If the cutting accuracy of a metal laser cutting machine cannot reach the cutting accuracy, the current domestic metal laser cutting machine problems are basically reflected in the focus of the problem , So for improving the cutting accuracy of the laser cutting machine, and accurately adjusting the focus of the metal laser cutting machine, what is a good way?

　　 First is the inclined plate method of adjusting the focus of the metal laser cutting machine, that is, using a plastic plate placed obliquely at an angle to the vertical axis to pull it horizontally to find the smallest point of the laser beam of the metal laser cutting machine as the focus.

　　 Next is the printing method of the metal laser cutting machine to adjust the focus, that is, the cutting head of the metal laser cutting machine is moved from top to bottom, and the laser beam printing is performed on the plastic plate, and the spot with the smallest printing diameter is 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 common method, that is, add a collimator to the output end of the metal laser cutting machine for beam expansion. The diameter of the beam becomes larger and the divergence angle becomes smaller, so that the beam size at the near end and the far end before focusing is close to the same in 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 from the nozzle to the surface of the material are two independent parts. When the machine tool table moves or the optical axis moves, the beam moves from the proximal end to the distal F axis at the same time, so that the beam spot diameter remains the same in the entire processing area after the beam is focused.

The last is the blue spark method of adjusting the focus of the metal laser cutting machine. 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 blue spark is the largest. As the focal point, the focal point can be calculated in this way, and the corresponding focus can be adjusted according to the different thickness of the plate in the subsequent cutting process.

　　 For the cutting machine of the flying light path, due to the beam divergence angle, the length of the optical path between the near end and the 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.

　　 Adjusting the focus of the metal laser cutting machine is equivalent to improving the working efficiency of the metal laser cutting machine, and furthermore, it improves the production efficiency of the entire enterprise.