Research On Hydraulic Roll Gap Control System Of Φ400 Tube Rolling Mills

The roll gap control is the key of product quality on the tube rolling mill, the level of design and manufacture directly influence the end product quality of seamless steel pipe and the benefit of production enterprise. So the technique of roll gap control has been always one of the important research questions on rolling mills.This paper mainly studies the technique of the roll gap control system ofΦ400 tube rolling mill.It introduces the development of the technique.In addition,this paper describes hydraulic roll gap control technique ofΦ400 tube rolling mill in detail,including the composing and the control principle ofΦ400 tube rolling mill hydraulic system. Hydraulic roll gap control can be explained as follows:Because of the change of rolling force,the space between two rollers of mill change followed,and then the equipment installed hydraulic roll gap control adjust the press down displacement to compensate the changing.Before building the math modeling of the hydraulic roll gap control system,reasonable simplification was made.And also because of the adoption of classical theories,the modeling of the hydraulic roll gap control system is not only simple,but also reflecting the affection of the main factors of the system.With the MATLAB/Simulink,the simulation has been made.Because all the process and data correspond to real system,the results are correct.Based on the principle that the transfer function of open-loop system has only one closed-loop configuration with unit feedback,compensator of the hydraulic roll gap control system is designed with the tool box of MATLAB/sisotool. This paper also proves the usage of the sisotool,and provides an example for further spreading use of the sisotool.