| With the continuous development of the manufacturing industry in the direction of high precision and high intelligence,laser processing is widely used in various fields due to its high precision,high efficiency,and non-contact characteristics.Existing control systems often use traditional devices such as programmable logic controllers(PLC)or personal computers(PC)to control lasers,which have problems such as high cost,inflexibility,and poor real-time performance.As well as the scanning distortion of the galvanometer and the position tracking performance of the galvanometer motor and the problem of laser control,this paper conducts in-depth research on the control of lasers and scanning galvanometers in laser processing and designs a collaborative control system based on ARM+FPGA.The specific research content is as follows:First of all,aiming at the problem of poor weld seam quality in the laser processing and welding process,the influence of laser power and welding speed on the welding effect in the welding process is analyzed,and two flexible adjustment strategy models for laser power are proposed.Secondly,analyze the cause of the error in the scanning process of the galvanometer,and perform static error correction for the distortion in the scanning process of the galvanometer.The mathematical model of the galvanometer motor system is established.In order to improve the working performance of the galvanometer system,a robust adaptive integral backstepping control strategy based on friction compensation is designed to dynamically optimize the position tracking control of the scanning galvanometer,and the simulation verification is carried out through MATLAB/Simulink.Third,a collaborative control scheme for laser processing and welding based on ARM+FPGA is designed.Carry out hardware circuit design and software programming.The hardware part of the controller includes a power supply module,a main chip module,a human-computer interaction module,an external communication module,and a collaborative control module circuit design.The controller software program mainly includes laser processing parameter setting,scanning galvanometer control module,laser control module and processing cooperative control module.Finally,build a laser processing and welding platform for testing and verification.On the basis of completing the basic function test of the laser galvanometer control module and the laser power control module,the static correction effect of the scanning error is tested,and the overall performance of the laser processing and welding system is inspected.The experimental test results show that: the control output signal of the scanning galvanometer can meet the control requirements;after the scanning distortion of the galvanometer is corrected by fitting,it can realize high-precision positioning scanning with a side length of 200 mm square pattern range deviation within 0.04mm;laser processing The overall performance of the welding system and the quality of the weld seam are significantly improved,and the depth of the pit is only 15% of that of the traditional welding method.It solves the problems of poor quality of laser-processed welds and unstable welding,and expands the application range of laser-processed welding. |
