Theoretical And Experimental Research Strength Combined Film Babbitt Bearings And Steel Body

Oil-film bearing is the bearing assembly which is mounted in support rollor work roll of rolling mill machinery and equipment. It is widely used in keyparts of high-end, precision, or sophisticated device because of its’ feature oflarge-scale and overloads. The applications’ range contains steel, mining,metallurgy, electric power, aerospace and so on. The weakest part of oil-filmbearing is Babbitt layer of bushing due to enduring overloads or greater impactloads. The fine bonding between Babbitt layer and steel body is the basiccondition for bearing bush to able to play the role. If the interfacial bondingproperty is bad, it is easy to fall off for Babbitt layer in the case of differentconditons of application environment. It will cause the failure or damage ofbearing, and directly relates to the ultimate performance of oil-film bearing.Meanwhile, with the development of surface engineering and nanotechnology, itis essential to research the theoretical model of interfacial adhesion strengthbetween Babbitt layer and steel body of oil-film bearing. It has the veryimportant theoretical and practical significance for evaluating casting/sprayingquality of Babbitt layer, optimizing the preparation process, and developing newbonding and multiplexing technology.Based on the working conditons of mechanical system of oil-film bearingwhich in patent ‘A comprehensive test rig of oil-film bearing in rolling mill’ andstructural composition of mechanical system of oil-film bearing which in patent‘A comprehensive testing device for oil-film bearing’, the comparison table ofmodel evaluation of interfacial adhesion strength in the different types of contactsurface adhered some metal is abtained in the teating data of bonding strengthwith static load method. It is convenient for corporate to choose a reasonableproduction process in order to save costs and obtain optimal performance,according to actual requirement of oil-film bearing series. The main contentsand innovations are as follows.Firstly, by force analysis of interfacial joint area between Babbitt layer andsteel body, the analytic function is abtained based on thick-walled sylindertheory and theoretical derivation for ‘transition zone’ stress. The criticalmaximum of actual load of oil-film bearing is obtained according to allowable adhesion strength. For circular arc joint surface, the peak stress of interficalbonding has been deduced based on hertz contace theory. The simulationanalysis ang comparison of interface stress model is carried out by using ComsolMultiphysics coupling software.Secondly, the formula of impact factor of Babbitt is proposed. Though thetest of young’s modulus of composites which have different Babbitt proportionor whether there is a hanging Sn layer process, the mathematical expression ofyoung’s modulus of composite and mpact factor of Babbitt depended onproportion of Babbitt are obtained by using idea of data fitting approximation.Two more important conclusions are obtained in the comparative analysis, andwill provide scientific basis for the certainty of optimum thickness of Babbitt.Thirdly, a multiple linear regression model is eatablished and the functionalrelationship of Sn layer thickness depended on effecting parameters is obtained.The simulation analysis of interfacial architecture system’s energy compositionis carried out by using molecular dynamics simulation software—‘MS’. And thefitting cruve of interfacial binding energy depended on the ratio of Sn layer isobtained. Then, the optimum Sn layer thickness is determined according toactual size of bushing and the expression of Sn layer. Also, experimentalverification is conducted.Finally, under the consideration of contact surface type of steel body, thequalitative analysis of forces, internal stresses, and metallographic structure ofadhered alloy surface are carried out for three different adhered alloy surfaces.And the theoretical model of interfacial adhesion strength is established underdifferent types of contact surface adhered some metal. The stress field of bindinginterface is simulated by building tiny unit model in Comsol Multiphysicscoupling software. Then, the interfacial stress distribution of different processingconditions is analyzed. At last, the comparative analysis by experimental test iscarried out, and the constructed model is analyzed and evaluated.