Common problems of laser cutting
Burrs appear on the edge of the workpiece during laser cutting:
When laser cutting carbon steel, burrs sometimes appear on the edge of the workpiece, making the surface not smooth, and some are difficult to remove, mainly due to the following points:
1. The upper and lower positions of the laser focus are not correct. The focus position test needs to be done and adjusted according to the offset of the focus;
2. The nozzle selection is not suitable, replace the nozzle;
3. The purity and pressure of the cutting gas are not enough, and it is necessary to provide high-quality cutting working gas and increased pressure;
4. If the quadrilateral is cut and burrs appear on the two adjacent sides, it means that the center of the optical path is offset, and it is necessary to re-teach the center point of the optical path from the nozzle; if there are burrs on the two parallel sides, it means that the laser head is installed on the There is a problem with the verticality on the machine tool, you can teach the installation verticality of the laser head according to the burr direction of the parallel side; please check whether the roundness of the nozzle mouth of the nozzle has changed, and it must be ensured that the roundness of the nozzle mouth is a full circle .
Laser cut sheet can not be cut through:
1. The power of the laser decreases or the aging of the lamp tube makes the energy of the laser beam insufficient, causing the sample to be cut through. Need to adjust the laser power to replace the laser generator tube;
2. The cutting speed is too fast, select the appropriate cutting speed according to the thickness of the cutting plate;
3. Check whether the output air pressure of the proportional valve is consistent with the cutting air pressure set by the upper computer, and whether the oxygen meter is at the indication of 10 kg;
4. Check whether the protective lens is damaged and replace the protective lens;
5. If the focus position is not suitable, adjust the focus position according to the thickness of the plate;
6. On the premise that there is no problem with the protection lens, cutting speed and air pressure, check whether there is any problem with the optical fiber interface. If there is no problem with the optical fiber interface, please check whether the collimating lens and focusing lens of the laser cutting head are damaged. , please replace it in time.
Rough surface of laser cut sheet:
For carbon steel: if the upper surface is too rough, it means that the cutting focus is too far away from the plate, and the focus needs to be adjusted closer; if the lower surface is too rough, the cutting gas pressure is too high, reducing the gas cutting pressure; the overall texture is too rough, the cutting speed is too high Slow, increase the cutting speed.
Is the alignment easy to shift during processing?
cause of issue
1. The fiber is loose.
2. The problem of adjusting the module.
3. The ceramic body is loose.
4. The nozzle is loose.
Troubleshooting plan
1. Check whether the fiber is locked.
2. Contact the cutting head manufacturer.
3. Check whether the ceramic body and nozzle are locked. If they are loose, they need to be reinforced.
Fiber optic interlock alarm?
cause of issue
1. The optical fiber installation is not in place.
2. QBH internal contact problem.
3. Laser fiber connector problem.
Troubleshooting plan
1. Re-lock the fiber according to the instruction of the cutting head.
2. Contact the cutting head manufacturer for processing
3. Contact the laser manufacturer for processing
Abnormal cutting effect?
cause of issue
1. Check whether the cutting parameters are called correctly.
2. Whether the adjustment of the cutting focus is correct.
3. The problem of cutting air source.
4. The problem of cutting head lens.
Troubleshooting plan
1. Check the cutting parameters and cutting focus position.
2. Check whether the gas is sufficient and the gas purity.
According to the selected cutting gas (O2, N2), observe the barometer on the gas cylinder. If the oxygen is about 10 kg, check whether the output gas voltage value of the cutting system corresponds to the value displayed by the gas proportional valve, generally 10V corresponds to 10 kg; Nitrogen needs to be adjusted according to the thickness of the cut sheet. The purity can be satisfied by checking the gas cylinder label to meet the purity of more than 99.9%. If nitrogen gas is used for cutting, it can also be detected by cutting the stainless steel end face. The yellowing of the end face is low in purity, and high-purity gas needs to be replaced immediately.
3. Take out the protective lens and check if there is any pollution. If there is pollution, the lens needs to be cleaned.
4. Check whether the inner lens of the cutting head and the end face of the optical fiber are normal according to the method in the third troubleshooting plan. If the position is not correct, adjust to the correct position.
The focus dial cannot be adjusted?
cause of issue
1. The focusing stroke is exceeded during the focusing process.
2. The damage of the sealing ring at the position of the protective lens seat causes the auxiliary gas to enter between the focusing module and the protective lens.
Troubleshooting plan
1. Check whether the focusing range has been exceeded. If it exceeds the focusing range, first loosen the locking screw on the left side of the cutting head where the signal amplifier is installed, and then try to adjust and re-tighten the screw.
2. Check whether the sealing ring with steel ring under the protective lens is damaged. If it is damaged, the sealing ring needs to be replaced.
Abnormal capacitance value alarm?
cause of issue
1. The ceramic body is damaged and loose.
2. The nozzle is damaged or loose.
3. The nozzle connector is damaged when touched.
4. Signal line problem.
Troubleshooting plan
1. Check whether the ceramic body and nozzle are damaged or loose. If damaged or loose, replace and reinforce.
2. After removing the ceramic body and the nozzle, check whether the contacts at the installation position of the ceramic body of the cutting head are damaged. If there is damage, contact the supplier for replacement.
3. Check whether the signal line is disconnected.
If there is no obvious damage, you can use a multimeter to do a specific inspection under the guidance of an after-sales engineer.
Nozzle temperature too high during processing?
cause of issue
1. Centering offset.
2. Protect the lens from contamination.
3. Contamination of focusing lens or collimating lens.
4. Optical fiber pollution.
Troubleshooting plan
1. Check whether the alignment is offset, if there is any offset, adjust it.
2. Take out the protective lens for inspection. After taking out the protective lens holder, be sure to use textured paper to seal the empty position of the cutting head. Do not blow air after removing the protective lens holder. If the protective lens is contaminated, it needs to be cleaned.
3. Check the optical lens inside the cutting head.
Lift the cutting head to the highest position, turn on the red light, unscrew the nozzle, place a piece of white paper within 20-40mm of the lower end of the ceramic body, and move it up and down to observe the uniformity of the red light. When observing the red light, try to block the periphery of the red light to ensure a certain contrast and enable clearer observation. If there are obvious black spots, it can be judged that the internal focusing or collimating lens or the fiber end face is polluted. This needs to be handled by contacting the after-sales service engineer. Do not disassemble the laser head without authorization, and do not continue to use it, so as not to cause greater damage .
