Torsional Vibration Analysis On Main Transmission System Of Down Coiler

With the rapid development of steel rolling industrial technology, the requirement of steelplate quality is increasing.Coiler as an important auxiliary equipment of steel rolling，its workingcondition directly affects the production of steel rolling.In the production process,the suddenlychange of work load will cause unstable torsional vibration of main transmission system,and themaximum torque of shaft will increase dramatically,which affecting the safety of coilingequipment and the quality of products. Since the traditional coiling control is likely to causemore intense torsional vibration in rolling thicker steel strip,it becomes more important toexplore the law of torsional vibration in coiling and optimize the control of system for improvingthe quality of product and keeping safety in working.According to the capacity checking project of down-coiler,Wuhan university of science andtechnology do some ifeld tests on coiler.On the basis of the tests,this thesis study deeply on thetorsional vibration of the coiler’s main transmission system by the mechanical dynamics.Firstly，the torsional vibration dynamic model，which can relfect the real situation correctly,wasbuilt. Secondly,the model is used for modal analysis and dynamic response analysis by numericalanalysis.By calculating^the natural frequency，main modes and the torque response of main shaftcan be got.The research results show that,the torsional vibration of main shaft occur mainly atthe coiling start,between coiling end and braking start,and the braking end,especially in the timeof between coiling end and braking start,the torsional vibration become more intensity.Analyze the time values in each stage of coiling by the torque response simulation,the lawof torsional vibration can be got,and the optimization method of speed control can help toworking safety in coiling.