How to adjust the focus of cnc fiber laser cutting machine sheet metal?

1. Numerical control positioning and punching method of laser focus

CNC positioning method: with a smooth and clean white cardboard, tiled on the table, the laser cutting head is set above it, the height of the focusing mirror from the cardboard is about 10mm smaller than the focal length of the focusing mirror size, such as the focal length of the focusing mirror is 127mm, the focusing mirror is set in the distance from the cardboard about 117mm.The CNC system sets the cutting head to move along the X axis or Y axis every 10mm, and each time the Z axis rises 1mm, and the distance of 20 consecutive moves can be set.When each move is in place, 20 holes are drilled for 20 times, and the height of Z-axis is increased by 20mm.Looking at these 20 holes, we can see that the diameter of the holes changes from large to small, and then from small to large.Find the position of the smallest aperture that is the focal point, and note that.The distance between the board and the lens when measured at this position is the actual laser beam focal point.cnc fiber laser cutting machine sheet metal

2. Incline focus burning method

Bevel focus burning method: the method is indicated as follows: place the flat board on the table at an Angle of about 10 degrees.The cutting head is set at point A, A point distance from the focal length of the focusing mirror size is 20mm smaller than the focal length of the focusing mirror size, CNC system set cutting head along the X axis or Y axis continuous horizontal movement 230mm, the start of the movement of the laser output 200W continuous laser, cutting head movement stopped, the laser also stopped.At this time, the board can be seen on the width of a laser beam, narrowed from narrow burn marks.Take the narrowest point of the trace as the focal point, record this point, measure the distance between the board in this position and the lens is the actual laser beam focal point.fiber laser cutting machine sheet metal

3 laser cutting direct cauterization method

Direct burning method: this principle is to hold a flat board, immediately cut the work surface at an Angle of 85 degrees, the cutting head to the focusing mirror from the surface of the table about 1.5 times the focus of the position.Turn on the laser brake, continuous output 200W laser beam, quickly move the board to the bottom of the focusing mirror, you can see the surface of the board will have a wide to narrow, and from narrow to wide before and after the laser beam focusing burn marks, this marks and laser beam focusing process changes are very close.Take the narrowest point of the trace as the focal point, record this point, measure the distance between the board in this position and the lens is the actual laser beam focal point.Because this method requires manual operation, special attention should be paid to safety, so as to avoid causing human injury.fiber laser cutting machine