Dynamic Modeling And Simulation Of Strip Rolling Mill Based On Bearing Stiffness Characteristics

With the development of the strip rolling mill towards high speed and large scale,higher requirements are put forward for the stability of the equipment operation process.At present,under the conditions of high-speed and heavy-load operation of the strip rolling mill equipment,the problem of irregular roll system vibration during the rolling process becomes more and more obvious.The smooth operation of the rolling mill directly affects the product quality accuracy and quality stability.The strip rolling mill is a complex mechanical system composed of multiple components such as a rack,a roll system,a balance device,and a transmission device.The coupling between the components caused by internal and external excitation makes the strip mill system a complex multi-body coupling dynamic system.Therefore,comprehensively considering the impact of bearing stiffness characteristics,the dynamic mechanism of the plate and strip rolling mill system is studied to provide a theoretical basis for revealing the inherent relationship between the rolling process parameters and the dynamic characteristics of the rolling mill system.This paper takes a 1400 mm rolling mill in a certain factory as the research object,and conducts vibration test research on the on-site operating state of the rolling mill.It is found that the rolling mill has vibration problems during operation,resulting in quality defects in the finished plate.In order to improve the product qualification rate,the reason for the vibration of the rolling mill is explored.The collected data analyzes the operating status of the equipment;establishes a theoretical model of the stiffness between the roll trains of the rolling mill,between the roll train and the rolling piece,and the bearing.At the same time,establishes the force and displacement relationship model of the roll train and the bearing.The force state of four-row tapered roller bearings and the stress changes of the work rolls during the rolling of the strip are analyzed by finite element analysis,and the natural frequencies and vibration modes of the roll system and bearings are extracted;and the finite element method is used to calculate the roll system and For the stiffness value of the bearing,the collected data and finite element calculation results were imported into the Maple Sim software to simulate the rolling process of the rolling mill;at the same time,based on the established three-dimensional model,different process parameters(rolling speed,friction coefficient,pressure It is found that among the three process parameters,the rolling speed has the greatest impact on the stability of the rolling mill.By reducing the rolling mill speed,the vibration of the rolling mill can be greatly suppressed,thereby reducing the impact on the plate due to vibration.Serious hazards brought by the product.The above modeling and simulation research work can better grasp the motion law and vibration characteristics of rolling mill rolls and bearings in space,and propose rolling mill vibration suppression measures based on the analysis results,which can provide a theoretical reference for relevant rolling enterprises to understand rolling mill characteristics,And finally achieve the goal of reducing the vibration of the rolling mill,so as to obtain high-quality products.