Talking about the common faults and measures of laser marking machine

Talking about the common faults and measures of laser marking machine

After the laser marking machine has been used for a period of time, some problems occur probably, such as the power drop down. How to solve the problem of laser power drop down? Let's learn about common faults and treatment measures with DOTSLASER.

1. Reasons for the weak laser output of the new machine that has not been used for a long time:

   ① Whether the laser output measured at the factory reaches the technical index or not;

   ② Whether the accuracy of resonant cavity adjustment meets the requirements;

   ③ Whether there is light leakage in the all-reflection diaphragm;

   ④ Whether the insertion loss of the acousto-optic switch is within the specified range.

   
   

2. After the laser marking machine has been used for a period of time, the reason of laser output decreases:

   ① Whether the laser resonant cavity has changed: fine-tune the resonant cavity lens to make the best output spot;

   ② Whether the total reflection and output diaphragm are stained;

   ③ The acousto-optic crystal shifts or the output energy of the acousto-optic power supply is low: adjust the position of the acousto-optic crystal;

       ④ Whether the temperature difference between the cooling water tank water temperature setting and the ambient temperature exceeds 5℃;

       ⑤ Whether the service life of the krypton lamp has expired;

       ⑥ The laser entering the galvanometer is off-center: adjust the laser;

   　⑦ If the current is adjusted to about 20A and the sensitivity is not strong enough: the krypton lamp is aging, replace it with a new one.

  3.The laser output power of the laser marking machine is normal, but the laser beam cannot play a marking role:

      ① Whether the adjustment of the optical path system is accurate;

      ② Whether the sound and light switch can function as a switch;

      ③ The D/A card controls whether the sound and light output signal reaches 5V.

  4. The reason why the acousto-optic switch of the laser marking machine cannot switch the laser:

     ① Whether the RF output power of the acousto-optic power supply is normal;

     ② Whether the power switches are in the correct position;

     ③ Whether the radio frequency line connection is reliable;

     ④ Whether the light-on end of the Q switch is dirty.

  5. The reason why the laser marking machine cannot reach the expected marking depth:

     ① Whether the laser output power meets the requirements;

     ② Whether the turn-off power of the acousto-optic switch meets the requirements;

     ③ Whether the light path adjustment is accurate;

     ④ Whether the position and direction of the beam expander are adjusted accurately;

     ⑤ Whether the lens surface is polluted;

     ⑥ Whether the surface of the workpiece is on the focal position;

     ⑦ Whether the 28V DC voltage of the laser power supply has dropped, causing the laser output power to drop.

  6. The reason why the krypton lamp cannot be ignited in the laser marking machine:

     ① Whether the Krypton lamp has reached its service life;

     ② Whether the connection between the electrodes at both ends of the krypton lamp and the laser power cable is secure;

     ③ Whether the laser power supply is working normally.

  7. Several main problems of laser marking machine D/A card:

     ① There is no acousto-optic turn-on signal (+5V) on the 8th pin, causing the acousto-optic power supply to fail to turn on;     

     ② The analog signal output cannot accurately reflect the design content, that is, garbled characters appear;

     ③ AD7237 does not work normally, and the displayed phenomenon is that the printed lines are broken lines.

  8. Several main problems from the galvo head:

     ① The standard square is printed as a trapezoid or diamond;

     ② The square frame is deformed into a pincushion or barrel shape.

  9. The solution from galvo scan head :

     ① Pincushion or barrel distortion is an inherent phenomenon of galvanometer marking, which is determined by the scanning mode of galvanometer. The solution is to correct the distortion;

     ② There are two correction methods, one is hardware correction, which is rarely used at present. The other is software calibration, which is the one we use more currently;

     ③ The method of hardware calibration is to change the voltage value of the analog signal output by the D/A card through a calibration card according to a certain rule, and then transmit the signal to the vibrating lens;

     ④ The method of software correction is that the marking software itself has a correction function. In the marking process, the digital signal is processed according to a certain method, and then the signal is transmitted to the D/A card.

  10. The laser marking machine laser prints lines into a dotted line:

     ① Whether the signal line is well connected, and whether there is any false welding;

     ② Whether there is a problem with the connecting line between the vibrating lens drive board and the motor;

     ③ Whether the D/A card is in the correct position when inserted into the ISA slot;

     ④ Whether AD7237 works normally.

  11. Problems from circuit:

     ① Due to long-term operation, the terminal of the krypton lamp is loosened, causing the krypton lamp to not burn or spark;

 　② Due to long-term operation, the air conditioner is not cooling. First, check whether the connecting parts are tight, and secondly, check whether the upper and lower limit temperature settings of the temperature controller are reasonable. The upper and lower limits of the temperature controller should be set according to the ambient temperature ±4℃. If there is a Freon leakage, the connecting parts should be reinforced, and professionals should be asked to add Freon.

  12. Problems from optical path:

     ① Due to long-term operation, the krypton lamp is aging, which causes the laser output power to drop;

     ② Due to long-term operation, the dielectric film has different degrees of contamination, resulting in light leakage or a decrease in output power of the total mirror;

     ③ Due to human factors, the customer adjusts the position of the resonator cavity or the position of the dielectric diaphragm without knowing the specific situation, which causes the laser output power to decrease or the laser divergence angle to increase, resulting in a large change in the output laser position.

   13. The adjustment problem of the beam expander:

 　① The adjustment requirements of the beam expander: the incident light should be at the center of the beam expander's entrance hole, and the exit light should be at the center of the light exit hole;

     ② The adjustment of the beam expander has a great influence on the laser marking effect. Mainly manifested in:

     A. The laser power drops;

     B. Uneven laser intensity in the marking area;

     C. The computer software design center deviates from the physical center of the light output of the vibrating lens;

     D. Can not achieve beam expansion effect.

   14. The laser output spot flickers:

     ① Whether the adjustment of the resonant cavity is accurate;

     ② Whether the diaphragm holder is firmly fixed;

     ③ Whether there is any problem with the fixation of the condenser cavity;

     ④ Is the YAG crystal fixed tightly properly?

   15. Issues that need to be noticed when the software calls PLT files:

     ① Pay attention to the settings when converting dwg files to plt files;

     ② The graphic size after calling should be adjusted again;

     ③ A fixed ratio should be used for zooming in and out to avoid distortion of the design graphics.