Development Of Laser Cutting Capacitor Raising Servo Control System

Due to the laser cutting has the advantages of strong controllability,cutting heataffected zone and small thermal distortion,strong material adaptability,the laser cutting technology has been developed rapidly in recent years,gradually replacing the traditional cutting technology such as wire cutting,flame cutting,plasma cutting.Compared with the traditional cutting technology,laser cutting technology reduces the production cost of enterprises,improve the quality of product processing,no need for secondary processing,in line with the concept of green development.Therefore,laser cutting technology is widely used in automotive manufacturing,engineering machinery,aerospace and other fields,which has become the mainstream cutting technology.With the rise of laser processing technology,laser cutting machines have increasingly high requirements for tracking accuracy and speed of the servo control system in the Z-axis direction.In order to solve this problem,this thesis studies the key technology of capacitor height control system which affects laser cutting,and develops a high precision capacitor height control system,which realizes the automatic high precision and high speed of cutting head in the process of laser cutting.In the process of development,the factors affecting the precision of capacitance sensor are analyzed,and the microcapacitance measurement module based on capacitor three-point LC oscillator circuit is developed.Secondly,the modulation controller based on FPGA slave controller and STM32 master controller is designed.The system measures the capacitance signal through the micro-capacitance measurement module,and sends the measurement signal to the height controller.The height controller controls the laser cutting head to move vertically in the Z-axis direction to realize the height following.In order to meet the different needs of users,the controller has two kinds of height-setting mode,independent mode and bus mode.This thesis first analyzes the functional requirements of the system and designs the overall scheme.This thesis introduces the design of the micro-capacitance measuring module and the hardware circuit of the elevation controller.The software development of embedded system is carried out with the sequential execution architecture of front and back.The system calibration program and height following program are designed,and the sliding average filtering algorithm is improved.Finally,a test platform was built to verify the error accuracy of the capacitor elevation servo control system within0.01 mm through the actual computer test.