| Copper material,as the most widely used conductive material in our country,has good conductivity and mechanical properties.And the development of modern industry on the conductivity and strength of synchronous improvement.Once again,higher requirements are put forward for the performance and forming process of copper materials.Rolling technology is a common sheet forming processing technology,it is by the rolling mill work roll rotation and the friction generated by the plate to bite the plate into the gap between the roll,and at the same time rely on the vertical pressure exerted by the upper and lower rollers to make the rolled between the work roll compression deformation processing method.The material quality after processing has obvious advantages.The tension of sheet metal in the rolling mill production line is a very important process parameter in the rolling process,which has a direct influence on the forming quality and material properties of the rolled sheet metal.The unstable tension will cause the defects of the sheet metal and even the damage of the equipment.Therefore,it is very important to design stable and fast response tension control system for rolling quality.This thesis aims to design and establish a set of tension control system suitable for single-layer copper foil rolling at high temperature,and achieve tension stability and thickness accuracy of copper foil rolling and provide reliability for multi-layer copper foil rolling tension control through accurate adjustment and control of tension.Firstly,the research status of tension control is analyzed,the working flow of unwinding machine and the way of tension control are introduced,the generation of tension is analyzed,and the tension of copper foil at 600℃ is determined to be 12 N.The hardware bases such as actuator and detection components used in constant tension unwinding control system are analyzed and the selection of components is made.The overall scheme of unwinding tension control system is completed.Then the mathematical model of the tension control system is obtained through dynamic analysis of the tension in the unwinding process of the unwinding machine.Analyze the control strategy applied to the system and design a reasonable controller according to the system parameters.Finally,with the help of MATLAB\Simulink simulation platform,the tension changes under different control strategies are simulated and compared with the fuzzy adaptive PID control,the anti-interference is better and the robustness is stronger.The control accuracy and stability of fuzzy adaptive PID control were simulated under the conditions of different constant line speed,different line speed,tension set point mutation and different winding diameter.The optimal tension change condition was determined when the running line speed was 2mm/s,and the accuracy was ±0.4N.Finally,the unwinding tension control experimental platform based on magnetic powder brake was established to verify the performance of the experimental platform and the effectiveness of PID control with dead zone on the tension control system under different constant line speed,different line speed and tension set point mutation.Through the analysis of tension curves of different line speeds,it is found that when the speed of the line is 2mm/s,the running condition of the equipment,the fluctuation of the foil,tension fluctuations are in a relatively stable state.The experimental results show that the steady-state error of tension under normal operation is within ±5%,and the tension fluctuation under variable speed operation is within ±7%,which basically meets the expected results.It provides a certain role in the process of rolling to prepare layered copper composites. |
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