Research On The Cutting Edge Rewinding Machine And Tension Control For Electroplated Diamond Wire

With the rapid development of the photovoltaic and semiconductor industries,in order to meet the increasingly stringent requirements for cutting efficiency and quality of silicon wafers,it is necessary to perform edge cutting and rewinding treatment on new lines of electroplated diamond wires.The trend of thin wire development has led to more stringent requirements for tension control accuracy in this process.The cutting-edge rewinding machine is an electromechanical device that integrates the cutting-edge and rewinding functions of electroplated diamond wire.The performance and efficiency of the cutting-edge rewinding machine directly affect the overall production efficiency of relevant production enterprises.Tension control technology is the key technology of the cutting-edge rewinding machine.Therefore,studying the multi axis speed synchronization and tension control technology of the electroplated diamond wire cutting and rewinding machine is of great significance for improving the performance of the cutting and rewinding machine and improving the sawing performance of the electroplated diamond wire.The main research work of this article is summarized as follows:(1)According to the actual requirements for cutting,trimming,and rewinding of electroplated diamond wire,the overall design of the cutting and rewinding machine was completed.The expected technical specifications of the cutting-edge rewinding machine are proposed,and the structure of the wire feeding system of the cutting-edge rewinding machine is designed.Using a multi axis servo motion control system based on EtherCat,a functional scheme for equipment communication,coupling control of each axis,and motion control has been developed.The layout scheme and deviation correction compensation method are designed,and the estimation method for continuous and discontinuous variation of coil diameter is proposed.(2)According to the overall plan of the blade rewinding machine,the hardware design,selection,assembly,and software design of the electromechanical part of the blade rewinding machine have been completed.The frame of the rewinder is made of Q235 steel plate and square steel,and important parts such as Timing belt drive,traction wheel,driven wheel and trunking sleeve are designed.The pulley and some parts are made of aluminum alloy to reduce inertia moment,and the trunking sleeve is made of polyurethane.JZHL-L1 single pulley tension sensor is adopted,CX9020 is selected as the motion controller,and all parameters are communicated and controlled through the touch screen of Ethernet communication and relevant I/O modules.The framework of the motion control program,the principle of the program operation process,and the structure of the human-machine interface were determined.The design and development of the motion program and the human-machine interface were completed using TwinCAT2 and EasyBuilder Pro.The feedback task program cycle was set to a minimum value of 2ms,ensuring rapid and accurate control.(3)Analyzed the principles of electromechanical transmission system and tension system,established a single feedback PID tension control system simulation model,and conducted simulation analysis.Simplify the Timing belt transmission system in the servo motor driven pay off end Timing belt transmission mechanism,and establish a single feedback PID tension control system simulation model combined with the simulation model of servo motor driven traction wheel transmission mechanism.Taking the speed of 20m/s as an example,the speed response errors of the pay-off wheel and the traction wheel are 0.0074rad/s and 0.0025rad/s respectively,indicating high response accuracy.When the tension is set to 6 N,the speed is 20 m/s,and the acceleration is 4 m/s2,2 m/s2,and 1.33 m/s2-respectively,the swing angle fluctuation range is ± 0.5°,±0.45°,and ± 0.42 °,and the tension fluctuation range is ± 0.5 N,± 0.37 N,and ± 0.3 N,respectively.The maximum steady-state deviation of tension is 0.507 N,0.436 N,and 0.412 N,respectively.The simulation results verify the feasibility of the designed wire feeding system and multi axis synchronous motion control system,and further propose a dual feedback tension control system.(4)The design of a fuzzy PID controller was completed with Deviation from pendulum angle eε and tension deviation eras the input,and real-time adjustments were made to the PID controller parameters.A simulation model of a dual feedback fuzzy PID tension control system was established based on a single feedback PID control system.At a tension of 6N and a speed of 20m/s,the simulated swing angle fluctuation range of both control strategies is ± 0.36°,and the tension fluctuation range is ± 0.45N and ± 0.25N,respectively.The tension control effect of dual feedback fuzzy PID control is better.Based on a matrix diameter of 60μm,The electroplated diamond wire with a tension of 6N and a speed of 20m/s was used as an example to conduct tension control tests under single and double feedback conditions.The swing angle fluctuation range at the discharge end was ± 0.8°,and the tension fluctuation range was ± 1.3N and ± 0.4N,respectively,verifying the superiority of the dual feedback fuzzy PID tension control system for tension control and achieving the expected technical indicators.This control accuracy can meet the usage requirements of the cutting edge rewinding machine for electroplating diamond wire with a diameter range of 50-60μm matrix at a speed of 0-40m/s,have a wider application.