The laser power stability of the sheet metal laser cutting machine directly determines the cutting quality, and power fluctuations may lead to rough cuts, slag accumulation, and even cutting interruptions. To solve this problem, we need to start from the entire chain of laser generation, transmission, and energy control, and rebuild the stability of power output through systematic troubleshooting and targeted intervention.
The abnormality of the laser generator is the core source of power fluctuations. As an energy generation device, the parameter deviation of the resonant cavity inside the generator will directly affect the output power. For example, the small deformation of the resonant cavity lens caused by long-term high temperature may change the laser oscillation path, leading to periodic fluctuations in power. At this point, it is necessary to recalibrate the parallelism of the resonant cavity using professional instruments, and at the same time check the output waveform of the excitation power supply - if the filtering capacitor of the power module ages, it will cause ripples in the pump energy, leading to high-frequency jitter in the laser power. The repair approach is to locate the power failure point through waveform detection, replace aging components, and re match the coupling efficiency between pump energy and resonant cavity.
The loss variation of the optical transmission system is another key factor. When laser is transmitted through optical fibers or mirror groups, any obstruction will cause energy attenuation fluctuations. The smoke particles attached to the surface of the focusing lens will form an uneven thermal lens effect with temperature changes, causing an imbalance in the energy distribution of the focused spot; The slight looseness of fiber optic connectors may result in intermittent reflection losses due to vibration. The investigation needs to follow the path from the light source to the focus: first, use a laser power meter to detect the transmission loss in sections, locate the abnormal section, perform ultrasonic cleaning on the optical components, and re calibrate the concentricity of the connecting components to ensure the consistency of the optical path transmission efficiency.
The response lag of the energy control system can also cause power deviation. If there is a delay between the power command issued by the CNC system and the actual output of the executing mechanism, instantaneous power mismatch is prone to occur during high-speed cutting of complex contours. For example, when the movement speed of a laser head driven by a servo motor suddenly changes, if the power adjustment module fails to respond synchronously, it will result in excess or insufficient energy at the corner. The solution needs to start from both software and hardware aspects: by optimizing the control algorithm to shorten the instruction response time, and upgrading the sampling frequency of the power feedback sensor, a real-time closed-loop adjustment is formed to control the deviation between the actual output and the set value within an acceptable range.
The core logic for dealing with unstable laser power lies in establishing a full chain diagnostic framework of "occurrence transmission control": first, identify hardware abnormalities in the energy generation link, then eliminate loss fluctuations in the transmission path, and finally optimize the dynamic response of the control system. This hierarchical investigation and precise intervention approach can quickly locate the fault point and fundamentally restore the stability of laser power, ensuring the continuity and consistency of the cutting process.