Contact Mechanism And Geometric Design Of Roller-bearing System In High Precision Mill

As one of the main materials for auto,building and construction industrial,cold rolled steel is mainly rolled by Sendzimir cluster mill,and one of the most critical parts of Sendzimir mill is backing bearing with high precision.It not only plays the role of transferring speed,but also,undertakes rolling force.The reliability of backing bearing is the guarantee for the normal operation of the mill.In the application of backing bearing,the contact performance under given structure size and service performance under multiple sets of assembling are the key factors.Therefore,it is with great significance and value to study the design and machining of backing bearing deeply.This article takes typical 20-roller Sendzimir cluster mill as study object,establish the contact mechanics model of the backing bearing and the contact mechanism simulation model of the rolling roll-group bearing system under single and double contact mode,the finite element method is applied to simulate the complex force transfer system of Sendzimir rolling mill and the contact stress and elastic deformation of the roller and backing bearing caused by the force transfer process.This research contents and the results obtained of this article as follows:1)Firstly,two typical contact mechanics models of single backing bearing and middle roller are established,and the finite element method is applied to solve the two models.The contact pressure distribution of the outer ring of the backing bearing under different contact forms and rolling forces,as well as the stress and deformation distribution of the inner and outer raceway are compared and analyzed.2)Then,based on the contact model and analysis results of single roller and double roller contact mode,the contact mechanism analysis model of saddle,supporting roller,assembled bearing and intermediate roller system is established,and the contact performance between supporting roller device and intermediate roller is studied,as well as the influence of the deformation of roller system on the internal contact stress distribution of assembled bearing.3)Using the established contact mechanical simulation model of single bearing – roll system and contact mechanism simulation model of assembled bearing-roll system,analyses the different roller arrangement,different type roller patching slope length,slope depth parameters and outer wall thickness difference of roll bending deformation and the stress distribution inside the backing bearings and,for a given condition of backup roll bearing assembling design requirements and provides the reference for the structural design of the backing bearings,gives the preliminary backing type bearing roller repairing and wall thickness difference structure design optimization suggestions from the view of the bearing contact and service performance.4)The performance of single set and assembled bearing and its components are verified and studied from two aspects of simulated performance test and actual installation test.Thedesign and manufacture of the bearing are verified by simulating the working condition of the bearing in the steel plant,and the operating temperature and vibration noise of the bearing are obtained.After the bearing simulation performance test is passed,the actual installation operation of the backing bearing is verified again.This paper studies the contact performance of roll-bearing system respectively from the backing bearing itself and assembling of multiple sets of backing bearings,the established model overcomes the disadvantages that the similar mill roll analysis model does not consider the actual bearing structure size,reveals the backing bearing work contact mechanism in the process of roll system,and optimization suggestions for structure design of backing bearings itself and the key parameters of assembling multiple sets bearings are put forward and the relevant verification experiment have been proceeded.