The high power laser cutting machine has the incomparable advantages of large cutting area, fast cutting speed and thicker cutting plate. The high power laser cutting machine has been unanimously recognized by the market. However, due to the high power cutting technology is still in the initial stage of popularity, some operators on the high power laser cutting skills are not very skilled. Here is a brief introduction to the high power laser cutting machine in the cutting process has some difficulties and solutions: found that the cutting effect is poor, should first investigate the following reasons:
1. All the lenses in the laser head are clean without pollution;
2. the water temperature of the water tank is normal, the laser no condensation phenomenon;
3. cutting gas purity, smooth gas path, no leakage phenomenon. Problem 1: Cutting with stripes
Possible causes:
1. the nozzle selection is wrong, the nozzle is too large;
2. the air pressure setting is wrong, setting the air pressure is too large, resulting in overburning stripe;
3. cutting speed is not right, cutting speed is too slow or too fast will also cause sufficient overburning.
The solution:
1. replace the nozzle, replace the nozzle with a small diameter, such as 16mm carbon steel bright surface cutting, can choose high-speed nozzle D1.4; 20mm carbon steel bright surface optional high speed touch nozzle D1.6;
2. reduce the cutting pressure, improve the quality of end cutting;
3. adjust the cutting speed, power and cutting speed match properly. Problem 2: Nodules on the bottom
Possible causes:
1. nozzle selection is too small, cutting focus does not match;
2. the air pressure is too small or too large, the cutting speed is too fast;
3. the material of the plate is poor, the quality of the plate is not good, and the small nozzle is difficult to remove the tumor residue.
The solution:
1. replace the large diameter nozzle, adjust the focus point to the appropriate position;
2. Increase or decrease the air pressure until the gas flow is appropriate;
3. choose a good plate.
Problem 3: Burrs on the bottom
Possible causes:
1. The nozzle diameter is too small to meet the processing requirements;
2. negative defocus does not match, should increase negative defocus, modulation appropriate position
3. the air pressure is small, resulting in burrs at the bottom, can not be fully cut.
The solution:
1. the selection of large diameter nozzle, can increase the gas flow;
2. increase the negative defocus, so that the cutting section reaches the bottom position;
3. increase the air pressure, can reduce the bottom of the burr.