Coupling Analysis Of Caster Mold Flow And Temperature Fields And Study Of Mold Oscillation System Control Technique

The mold and its oscillation system are the important part of the caster. In the inside of the mold,the molten steel is flowing strongly,at the same time the style of the flowing is influencing strongly the inner course of thermal transmission. Moreover,the flowing is influencing the molten solidification and the oscillation load. So to want to roundly study the course of the thermal transmission of the inner mold,the coupling of velocity field and temperature field of the inner molten steel should be fully analyzed. In this paper,the 3DM flow field and temperature field of the inner mold have been solved simultaneously,the coupling study by using a simulate software is finished. The conclusion of the study can be a reference for the technics parameters of the optimization flow and temperature fields. Moreover that can be used to set down the oscillation technics parameters.Nowadays the continuous casting producing extensively uses the direct current machine and alternating current frequency conversion machine to drive the double rocking lever mechanism through eccentric cam to realize mold. The style of above oscillation is almost sinusoidal. It is very difficult to adjust the oscillation parameter. On the other hand,the sinusoidal oscillation which controls the negative shrip time by adjusting frequency can't improve the lubricate condition and the surface quality of casting block at the same time. However the nonsinusoidal oscillation driven by electro-hydraulic servo system can autocontrol on-line the amplitude,frequency and deflectivity rate conveniently,and it can fully overcome the sinusoidal oscillation's disadvantage. In this paper,the nonsinusoidal oscillation wave of caster mold and the oscillation hydraulic system have been studied and tested. How to make the mold move stable under high frequency,not be distorted under high and low frequency and some other questions.In this paper,the nonsinusoidal reverse oscillation synchronization control model which can overcome the traditional model's disadvantage that the negative shrip time is raised along with the drawing speed's raising leading to the numericarea's raising is studied. The model opposite to the traditional model can make up for traditional model's disadvantage. Through the reverse adjusting the trend of the amplitude and frequency changing along wkh the drawing speed,the protectingslag's lubricate and the surface quality of casting block are improved.In addition,the control strategy of the mold oscillation is discussed in the final part of the paper. The digital PID program is exploitured and tested,and the algorithm's improving methods are also discussed. For the KP KI KD parameter of PID controller can't adjust self-adapted along with the changing of the given wave and controlled plant's parameter,the neural element self-adapted PID control algorithm is also studied. The advantage of the algorithm is that the off-line training weight,the on-line monitoring and control,self-adapting the disturbance brought by the given value and surroundings' changing can all be realized.To solve the limitation of the new 3rd caster of WISCO during the using course,in the final part of paper,the on-line monitoring is studied. Eemphasized particularly on the computer hardware,the design scheme is simply brought out.