Common faults of laser marking machine and treatment measures:
1. The use of new equipment is not long, laser laser output power is weak reasons:
① Whether the output power of the laser measured when leaving the factory reaches the technical index;
(2) Whether the accuracy of the resonant cavity adjustment meets the requirements;
(3) Whether there is light leakage in the full reverse diaphragm;
④ Whether the insertion loss of the acoustooptic switch is within the specified range.
2. After the laser marking machine is used for a period of time, the laser output power of the laser decreases.
(1) Whether the laser resonator changes: fine tuning the resonator lens, so that the output spot is the best;
(2) Whether the total reflection and output diaphragm are polluted;
③ acoustooptic crystal offset or acoustooptic power supply output energy is low: adjust the position of acoustooptic crystal;
(4) Whether the temperature difference between the water temperature of the cooling tank and the ambient temperature exceeds 5℃;
⑤ Whether the service life of krypton lamp expires;
⑥ The laser into the galvanometer deviates from the center: adjust the laser;
⑦ If the current is adjusted to about 20A is still not strong enough: krypton lamp aging, replace the new lamp.
3. The laser output power of the laser marking machine is normal, but the laser beam cannot play the marking role:
① Whether the optical path system adjustment is accurate;
② Whether the acoustooptic switch can play a switching role;
③ The D/A card controls whether the acoustooptic output signal reaches 5V.
4. The reasons why the acoustooptic switch of laser marking machine can not play the role of switching laser:
① Whether the RF output power of the acoustooptic power supply is normal;
(2) Whether the power switches are in the correct position;
(3) Whether the radio frequency wire connection is reliable;
④ Whether the end face of the Q switch through light is polluted or not.
5. Laser marking machine can not reach the expected marking depth reasons:
① Whether the laser output power meets the requirements;
② Whether the off power of the acousto-optic switch meets the requirements;
(3) Whether the optical path adjustment is accurate;
(4) Whether the position and direction of the beam expanding mirror are adjusted accurately;
(5) The surface of the lens is pollution-free;
⑥ Whether the workpiece surface is on the focal plane;
⑦ laser power supply output DC voltage 28V is down, resulting in laser output power down.
6. Reasons why Krypton lamp of laser marking machine cannot be lit:
① Whether the krypton lamp has reached the service life;
(2) Whether the electrodes at both ends of the krypton lamp are securely connected to the laser power supply;
③ Whether the working state of laser power supply is normal.
7 laser marking machine D/A card shows several main problems:
(1) The 8th pin has no acousto-optic turn on signal (+5V), resulting in acousto-optic power supply can not be turned on;
(2) Analog signal output can not accurately reflect the design content, that is, garbled characters appear;
(3) AD7237 is not working properly, which shows that the printing line is dotted line.
8. Several main problems shown by the vibration mirror scanning head of laser marking machine:
① The standard square is printed as a trapezoid or diamond;
The square frame has pillow shape or barrel shape deformation.
9 laser marking machine vibration mirror scanning head printing distortion solution:
① Pillow or barrel distortion is an inherent phenomenon of galvanometer marking, which is determined by the scanning mode of the galvanometer. The solution is to correct the distortion;
② There are two kinds of correction methods, one is hardware correction, currently used less. The other is software correction, which we use a lot nowadays;
(3) The method of hardware correction is to change the voltage value of the analog signal output by D/A card through a correction card according to a certain law, and then send the signal to the vibrator lens;
(4) The method of software correction is the marking software itself with the correction function, in the marking process, the first digital signal in accordance with A certain method for processing, and then the signal is transmitted to the D/A card.
10 laser marking machine laser printing lines into dotted lines:
① Whether the signal line is connected well, there is no virtual welding;
(2) Whether there is a problem between the vibration lens driving plate and the motor connection line;
③ Whether the D/A card is correctly inserted into the ISA slot;
④ Whether AD7237 works normally.
11. Problems of laser marking electromechanical circuit:
① Due to the long time operation, the krypton lamp wiring terminal appears loose, resulting in the krypton lamp spot non-ignition or ignition phenomenon;
② Due to the long time operation, the air conditioning does not refrigeration phenomenon, first of all, we should find out whether the connected parts are tight, and then we should check whether the upper and lower limit temperature setting of the temperature controller is reasonable. The upper and lower limits of the temperature controller should be set according to the ambient temperature of ±4 ° C. If there is freon leakage, reinforce the connecting parts and have a professional add freon.
12 laser marking machine optical path problems:
(1) Because of the long-term operation, the krypton lamp appears aging, resulting in the decrease of laser output power;
(2) Due to the long time operation, the diaphragm of the medium appears different degrees of dirt, resulting in the full mirror light leakage or output power decrease;
(3) Due to human factors, the customer does not understand the specific circumstances, adjust the position of the resonant cavity or the position of the dielectric diaphragm, resulting in the laser output power decrease or laser divergence Angle becomes large, resulting in a large change in the position of the output laser.
13. Adjustment of beam expanding mirror of laser marking machine:
(1) The adjustment requirements of the beam expanding mirror are as follows: the incident light should be in the center of the beam expanding mirror's incoming light hole, and the outgoing light should be in the center of the outgoing light hole;
(2) The adjustment of beam expanding mirror has a great influence on the laser marking effect. It is mainly manifested in:
a. Laser power decreases;
b. The laser intensity is not uniform in the marking format;
c. The computer software design center deviates from the optical physics center of the vibra-lens;
d. Can not play the beam expanding effect.
14. Laser marking machine laser output spot flicker phenomenon:
① Whether the resonant cavity adjustment is accurate;
(2) Whether the diaphragm frame is fixed firmly;
(3) Whether there is a problem in fixing the concentrating cavity;
④ Whether the YAG crystal fixation tightness is appropriate.
15. Problems needing attention when calling PLT file by PROLASE software of laser marking machine:
① Pay attention to the printer Settings when converting dwg files into plt files;
② The size of the graph after the call should be adjusted from new;
③ Amplification and reduction should use a fixed proportion, so as not to cause distortion of the design graphics.
