| Virtual Reality(VR) provides a more idealized form of human-machine interface between the computer and the user. It has been used in the roaming of production line and display of equipment and technological processes in metallurgical enterprises now. But the study of simulation system combined with the rolling process model is not yet mature. Since the 21 st century, Chinese iron and steel industry has reached the most rapid development stage. Many brilliant achievements have been accomplished in the study of theoretical rolling model, industrial on-line control technology and virtual simulation for rolling process. At the same time, industrial VR system has developed rapidly with the improvement of the computer hardware and software capability, which lays a solid foundation for the realization of organic combination of rolling model and VR. The subject is completed under the support of the open projects of the National Engineering Research Center for Equipment and Technology of Cold Strip Rolling in YSU, which named “Research on the Development and Application of Virtual reality Simulation System and its’ Key Technology for Heavy Mill”. Aiming at the 650 mm UCM four/ six-high cold/hot mill in the pilot plant of NECSR, the development and research of rolling process virtual reality system based on model-driven has been carried out in this thesis. The main research contents include:(1) Based on VRML and modular design concept, virtual scene of 650 mm six-high mill and its pilot workshop is established.(2) A calculation program on rolling schedule optimization design is developed on MATLAB platform with the integration of all existing rolling models. With the support of connection between VRML and MATLAB, the model-driven interface used to display the component motion of UCM roll gap adjustment and intermediate roll shifting is developed. It presents the 3D virtual reality of a mathematical model-driven rolling process.(3) The virtual strip technology based on 3D complex surface modeling of VRML Elevation Grid node is proposed. Combined with the strip transverse tension stress distribution and shape buckling discriminant model, shape defect prediction and 3D virtual display system of cold rolling strip is established for quantitative analytical prediction and 3D dynamic virtual display of common shape defects such as edge wave, central wave during strip rolling process. Compared with the data collected from the shape meter of 2230 mm cold tandem mill, the geometric parameters prediction results of wave defects and buckling discriminant model show comprehensive coincidence and are further validated, which lays a solid foundation for the development of virtual rolling and virtual shape meter system.(4) Using MATLAB/GUI as the platform support for virtual rolling system, the rolling model program is embedded to drive the mill VR system. Through imputing the rolling parameters, formulating the rolling process, presetting shape control and all other parameters, dynamic simulation, prediction and dynamic presentation of the rolled shape defect is realized. Finally the shape control suggestion is given according to the data.The model-driven technology between virtual mill and 3D scene of virtual strip has been studied through the above research. This thesis has also developed a virtual rolling simulation system, which integrates the technology of VR, rolling simulation, rolling model, human-machine interface control and data management and so on. The system makes it possible to simulate operation and conduct scientific experiments without affecting the actual production, which exerts a positive effect on development and validation of new theoretical rolling models, rapid transplanting of the industrial control model and promotion of the information construction of the Center. |
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