Research On Constant Tension Control System Of Reversible Warm Rolling Mill For Magnesium Alloy

In recent years,with the rapid development of China’s industrial modernization, magnesium alloy is gradually taken seriously and application fields are also expanding unceasingly.Especially in the field of the requirements of lightweight materials,such as 3C electronic products,automobiles and aerospace industries and so on.Magnesium alloy has the advantages of its products with light weight,good mechanical properties and corrosion resistance,etc..Therefore, the focus in magnesium alloy is the r&d and production of magnesium alloy sheet strip.As the last procedure in the production process, the control accuracy of coiling technology directly affects the quality of the final product.Coiling tension has great influence on the quality of strip shape and thickness accuracy.To ensure the stability of the coiling tension is the goal of our research and direction.In this paper, it is as the experimental background that the reversible six-roller warm rolling mill is produced by experimental research center of magnesium alloys in our school.We study deeply in the process of magnesium alloy strip rolling,the characteristics of tension control system and control means,finally realizes the constant tension winding control tasks.Firstly,according to the principle of tension generation and the comparison of several tension control methods, we select method of constant tension control based on constant line speed.Then establishing relevant mathematical models.According to the fluctuation of tension generated by coiling motor speed and diameter change in the process,put forward the compensation of dynamic torque and instantaneous coil diameter calculation.This paper establishes process parameter monitoring system for reversible six-roller warm rolling mill through the actual working conditions and related detection instrument, and uses Siemens S7-200 industrial equipment.The scene in real-time operation via the HMI display for monitoring.Because of the complexity of magnesium alloy rolling technology process and combining with the variable parameters system problems,we discuss in the tension control system to join gain self-adjusting PID algorithm.According to site specific parameters, simulation and analysis is carried out based on the conventional PID and the gain scheduling PID control system.The result shows that the self-adjusting PID control method has better dynamic performance and robustness,which can avoid the system performance affected by parameter change.Finally,according to the technological requirements and control principle to program to PLC,and to establish a friendly HMI.Though the collection,processing and analysis of experimental data,the result shows algorithm is feasible and effective.So it can be provided for adaptive control means and new tension control system equipment as theoretical support,and lays a theoretical foundation on the tension control system of computer simulation for in-depth study.