Method and system for uniformly controlling laser power

Abstract

The invention discloses a method for uniformly controlling laser power. The method includes the following steps that S1, light on-off parameters and a collection period are preset; S2, after cutting is started, a motion controller collects motion vector speed of current cutting; S3, according to the motion vector speed and the collection period, distance parameters are obtained; S4, according to the distance parameters and the light on-off parameters, the number of light on-off times is obtained; S5, according to the number of light on-off times, the PWM waveform is obtained, and the on-off state of a CO2 laser device switch is controlled by means of the PWM waveform, wherein the magnitude of the power of the PWM waveform is the number of light on times. The method for uniformly controlling laser power can precisely control cutting power of a laser tube in real time so that when cutting speed changes, the technical requirement of ablation uniformity of a cutting workpiece can also be met.

Description

technical field [0001] The invention relates to the field of laser cutting, in particular to a method and system for uniformly controlling laser power. Background technique [0002] The CO2 laser cutting control system uses a focused high-power laser beam to irradiate the workpiece, so that the irradiated material is rapidly melted or ablated, and at the same time, the desired graphic shape is processed on the workpiece by setting a specific trajectory. The power of the CO2 laser tube is controlled by the CO2 laser, and the motion controller controls the output power of the CO2 laser tube by controlling the CO2 laser. Usually, the interface used by CO2 to control the laser power is an analog quantity (0~5V). So as long as the motion controller outputs an analog value (0~5V) to the CO2 laser, it can indirectly control the power of the CO2 laser tube. [0003] The existing scheme is mainly to output a voltage of 0~5V to the CO2 laser by externally connecting a variable resist...

AI Technical Summary

Problems solved by technology

The biggest disadvantage of this solution is that in a cutting movement, the power of the CO2 laser tube is a constant value, while the speed of the cutting path is constantly changing, which leads to a serious laser ablation of the workpiece material at places with low speed, while Where the speed is high, the degree of laser ablation of the workpiece may not be sufficient to meet the process requirements of cutting workpiece ablation uniformity

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