Understand the abnormal faults of the laser marking machine, teach yourself how to operate and easily solve the problems.
Many companies and manufacturers have purchased optical fiber laser marking machines, and some abnormal problems have occurred, such as the decrease of output power of krypton lamp laser marking machines, the laser power display e004, the laser beam can not play the marking function, the expected marking depth, printing deformation, etc, It is a waste of money and resources to look around for human maintenance. Learn the following articles, you can complete and easily solve the problem yourself
1、 How to eliminate the causes of abnormal phenomena
1. The power indicator is not on. 1) The AC 220V connection is incorrect. 2) The indicator light is broken. Connect the power cord and replace it.
2. The protection indicator is on and there is no RF output. 1) Internal overheating, protection unit activated. 2) The external protection contact is disconnected. 3) The Q element does not match the drive, or the connection between the two is unreliable, which causes excessive reflection and causes the internal protection unit to work. Improve heat dissipation conditions. Check the external protective contacts. Measure the standing wave ratio.
3. The operation indicator is on and there is no RF output. 1) The luminous control signal is always valid. 2) The position of the RUN/T-on/T-off selector switch is incorrect. Check the dimming signal pulse. Turn the switch to the correct position.
4. Handle graphics and text confusion. The effective level of light emission is set incorrectly. Resets the effective brightness.
5. The laser power can be turned off too low. 1) There is a problem with the Q switching element. 2) The output RF power is too small. Check the Q switch. Adjust the output RF power.
6. The peak power of the laser pulse is too small. 1) The average laser power is too small. 2) There is a problem with the Q switching element. Adjust the light path. Check the Q switch element.
2、 Common faults and solutions:
1. Reasons for weak laser output power of new equipment that has not been used for a long time:
① Whether the laser output power measured by the factory reaches the technical indicators;
② Whether the adjustment accuracy of the resonator meets the requirements;
③ Whether the total reflective film leaks light;
④ Whether the insertion loss of acousto-optic switch is within the specified range.
2. Reasons for the decrease of laser output power after using the laser for a period of time:
① Whether the laser resonator changes: fine tune the resonator lens to optimize the output facula;
② Whether the total reflection and exit apertures are polluted;
③ The displacement of acousto-optic crystal or the low output energy of acousto-optic power supply: adjust the position of acousto-optic crystal;
④ Whether the temperature difference between the set value of the water temperature of the cooling water tank and the ambient temperature exceeds 5 ℃;
⑤ Whether the service life of lamp has expired;
⑥ Laser eccentricity entering galvanometer: adjust laser;
⑦ If the current is adjusted to about 20A and the sensitivity is not strong enough:: The lamp is aging, please replace it with a new one.
3. The laser output power is normal, but the laser beam cannot play the role of marking:
① Whether the adjustment of the optical path system is accurate;
② Whether the acousto-optic switch can play a switching role;
③ D/A card controls whether the acousto-optic output signal reaches 5V.
4. The reasons why the acousto-optic switch cannot switch the laser:
① Whether the RF output power of the acousto-optic power supply is normal;
② Whether the power switch is in the correct position;
③ Whether the RF cable is connected reliably;
④ Whether the luminous end of the Q switch is dirty
5. Reasons for not reaching the expected marking depth:
① Whether the laser output power meets the requirements;
② Whether the turning 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 beam expander are adjusted correctly;
⑤ Whether the lens surface is polluted;
⑥ Whether the workpiece surface is on the focal plane;
⑦ Whether the 28V DC voltage of the laser power supply decreases, resulting in a decrease in the laser output power.
6. Reasons for failure to light lamp:
① Whether the lamp has reached the service life;
② Whether the electrodes at both ends of the lamp are firmly connected to the laser power line;
③ Whether the laser power supply works normally.
7. Several main problems of D/A card:
① There is no acousto-optic opening signal (+5V) on pin 4, which causes the acousto-optic power supply cannot be turned on;
② The analog signal output can not accurately reflect the design content, that is, there is garbled code;
③ AD cannot work normally with krypton lamp laser marking machine, the laser power supply displays e004, and the print line is damaged.
8. Galvanometer scanning head shows several main problems:
① The standard square is printed as trapezoid or diamond;
② The square frame is deformed into pillow shape or barrel shape.
9. Solve the problem of deformation of galvanometer scanning head:
① The pillow shaped or barrel shaped deformation is an inherent phenomenon of the galvanometer mark, which is determined by the scanning method of the galvanometer. The solution is to correct the distortion;
② There are two correction methods, one is hardware correction, which is seldom used at present. The other is software calibration, which means we currently use more software;
③ The hardware calibration method is to change the voltage value of the analog signal output by the D/A card through the calibration card according to certain rules, and then transmit it to the vibrating lens.
④ The method of software correction is to mark that the software itself has correction function. In the marking process, digital signals are processed according to certain methods, and then sent to the D/A card.
10. Laser print line becomes dotted line:
① Whether the signal line is well connected and whether there is false welding;
② Whether there is a problem with the connecting line between the driving plate of the vibrating lens and the motor;
③ Whether the position of the D/A card is correct when it is inserted into the PCI slot;
④ Whether AD works normally.
1 1. Circuit problems:
① Due to long-term operation, the terminals of the lamp are loose, resulting in non combustion or spark of the causing lamp;
② Due to long-term operation, the air conditioner has no cooling. First, check whether the connecting parts are fastened; Secondly, check whether the upper and lower temperature limits of the temperature controller are set reasonably. The upper and lower limits of the temperature controller shall be set according to the ambient temperature ± 4 ℃. In case of Freon leakage, the connecting parts shall be strengthened and professionals shall be required to add Freon.
1 2. Optical path problem:
① The lamp is aging due to long-term operation, resulting in a decrease in laser output power;
② Due to long-term operation, the dielectric film is polluted to varying degrees, resulting in light leakage or the output power of the entire mirror is reduced;
③ Due to human factors, the customer adjusts the position of the resonant cavity or the position of the dielectric diaphragm without knowing the specific situation, which will reduce the laser output power or increase the laser divergence angle, resulting in a large change in the position of the output laser.
1 3. Adjustment of beam expander:
① Adjustment requirements for beam expander: the incident light shall be at the center of the beam expander entering the perforation, and the outgoing light shall be at the center of the beam expander;
② The adjustment of beam expander has a great influence on the laser marking effect. It is mainly shown in:
a。 Laser power decreases;
b。 The laser intensity in the marked area is uneven;
c。 The design center of computer software deviates from the physical center of light output of vibrating lens;
d。 The beam spreading effect cannot be achieved.
1 4. Laser output point flashes:
① Whether the adjustment of the resonator is accurate;
② Whether the diaphragm support is firmly fixed;
③ Is there any problem in fixing the condenser cavity?
④ Whether YAG crystals are firmly fixed.
1 5. Problems to be noted when software calls PLT files:
① When converting dwg files to plt files, pay attention to the printer settings;
② The graph size after calling shall be readjusted;
③ A fixed scale shall be used for scaling to avoid distortion of the design graphics.
