Research On Non-sinusoidal Oscillation System Of Continuous Casting Mold Based On Predictive Control

The development of modern continuous casting is mainly aiming at improving the yield and quality of continuous casting slabs. The oscillation of continuous casting mold is an important factor that has effect on casting production. The oscillation of continuous casting mold has experienced four kinds: Synchronisiru Negative slide >. Sinusoidal and Non-sinusoidal oscillation. Non-sinusoidal oscillation has the characters that the upward time of the continuous casting mold is longer than the downward time. It can reduce the friction between the mold wall and the strand surface, and prevents the strand from leaking and cracking, it can also improve the surface quality of slabs. It is the main development of continuous casting mold in the future.The aim in this paper is to study the hydraulic servo system that drives continuous casting mold. Compared with traditional mold oscillation device, this system can conveniently change oscillation wave and alter on-line oscillatory frequency and magnitude according to the continuous casting technological requirements. According to the analysis of the hydraulic dynamic machine, the system is a semi-closed loop system because the stroke feedback comes from piston rod.Aiming at the mathematical model of continuous casting mold control system driven by the hydraulic servo system, the predictive controller is designed. The test results demonstrate that the control system has not only better dynamic properties, but also strong robustness, and better self-adaptation for parameters variation and external disturbances.The computer system and its software are introduced for continuous casting mold oscillation driven by hydraulic servo. The software is programmed by Visual Basic 6.0 language; it is based on Windows 2000 platform. Experiment results indicate that it completely satisfies the requirements for production.