The Optimization Design Of Sectional Rolling Mill Housing Of Wide Plate Mill

It is difficult to cast large and wide plate mill housing through the integral casting processing. And it is also difficult to transport and install such huge housing. Design one piece of mill housing as sectional structure can effectively solve the above problems. Sectional rolling mill housing is combined with four parts, the upper /lower beam and the left/right column. Through eight preload rods, the housing can achieve the same mechanical properties as the integral frame. At present, a lot of large domestic mills are used sectional mill housing structure, which designed by German SMS(SMS). But the vast majority of research on the mechanical behavior of this kind of housing is confined to the study of rod preload. Therefore, optimization analysis this type of housing has a certain value. It is not only can increase mechanical properties of the housing to the greatest extent, but also promote the development of our country’s generous plate equipment level.The main purpose of this study is to optimize analysis the housing and get the optimal preload values and diameter values as will as a new housing structure, which can make the mill housing has the optimum mechanical properties.The main contents and conclusions of this paper studies:(1) Use Yingkou 5000 mm sectional roughing mill housing as research object, and establish 3D model of the housing in the ANSYS WORKBENCH. According to the engineering practice of the housing, have done statics analysis pretreatment, and done statics analysis. Statics analysis indicates that the safety factor of the original housing is not enough big. The window deformation is big, which can easy to cause the roll bearing seat damaged under the extrusion. It is important to improve the strength of the housing and the stiffness of the window.(2) Use the multi-objective optimization method based on genetic algorithm and the response surface to optimize the targets of the housing. Have done step by step optimization at first, that is, optimized the preload of the rods, the diameter of the rods, and the angle of the bosses. Obtained the optimized the optimal parameters and the best mechanical properties of the housing. Then have done the one step optimization, namely optimize the pre-load, rod diameter and the angle at the same time and obtained the optimal parameters and mechanical properties. Compared the upper optimizations, the mechanical properties of the step by step optimization are better, so let them as the optimized parameters, and got a new kind of structure housing. In the future, multi-objective optimization should follow the principle of "a small amount many times".(3) To avoid the housing occurs resonance phenomenon during work, the modal analysis has carried out on the housing before and after optimization. Got each order frequency and vibration mode of the housing, and checked the first order natural frequency of the new housing. Compared with the original housing, the natural frequency values of the optimized housing have increased slightly. And the natural frequencies are far away from the working frequency, which can effectively avoid resonance phenomenon during the work.