Feasibility Study Of Locomotive Bearing Bush Remanufacturing

The development of the national economy is closely related to the manufacturing industry,and the disposal of waste products is one of the difficult problems to be solved.In this case,the remanufacturing industry is applied in this situation,which not only solves the problem of the disposal of waste product parts but also saves the resources and protects the environment.Therefore,the remanufacturing industry is an emerging industry with international economic development and resource recycling.At the same time,the development of the national economy is closely related to the railway transport,and diesel locomotive is one of the indispensable power plants,such as in some cold and mountainous area,in the whole railway transport.Under normal working conditions,the bearing bush is the main friction pair of diesel locomotive engine,which is subjected to high non-stability load and is prone to wear and wear failure.The bearing bush is replaced during each major overhaul of the internal combustion engine.And if remanufacturing of the bearing bush and making full use of its value,it can save a lot of resources,and reduce labor and time of the new bearing manufacturing.In this paper,the remanufacturing bearing bush of internal combustion engine as the research object,The key engineering technology and process of bearing bush remanufacturing were further analyzed and chose the coating material needed for remanufacturing,In addition,the coating material,polyimide based composite,was prepared with the requirements of the performance of the bearing bush material,and the friction and wear properties were experimentally studied.And finally analyzes and calculates the theoretical basis,main structure and assembly parameters of the bearing bush.Finite element analysis was performed to demonstrate the feasibility of remanufacturing the coating material using polyimide-based composite materials as bearings.The main research contents and results of this paper are as follows.Firstly,the key engineering technologies for the remanufacturing of locomotive bearing bush and the remanufacturing process are elaborated and analyzed to verify the feasibility of the process flow.Next the process of remanufacturing bush were designed and the coating materials were selected.Secondly,the required coating materials for the bearing bush remanufacturing,Polyimide/Graphene(PI/GO)and Polyimide/Graphite(PI/GT)composite,were prepared by in-situ polymerization method.Their tribological properties such as friction coefficient and wear rate under different load and speed conditions were tested.The analysis of the results shows that the properties of these two composite coating materials are sufficient to meet the requirements of the wear-reducing coating materials for the bearing bush.Further,the surfacewear condition of the coating and the transfer film of the mating part were characterized and analyzed,and the mechanism of them was discussed,which can be the foundation for the application of the coating material as a remanufacturing anti-friction coating.Thirdly,the structure,working condition,failure mechanism analysis,lubrication film forming principle and bearing material performance requirements of the diesel locomotive bearing bush are introduced in detail.The assembling method of the bearing bush is explained and the assembly interference is calculated.Finally,the ABAQUS finite element analysis software was used to perform finite element analysis of original and remanufactured bearing bushes under assembly conditions and working conditions,and the deformation maps,equivalent stress diagrams,contact area diagrams and contact statuses of two different bushes were obtained.The results showed that the force analysis of remanufactured bearing bush was the same as the new bearing bushes,again demonstrating the feasibility of the composite material as a friction-reducing coating,so that replacement bushes in the overhaul period have another kind of simple recycling and remanufacturing way,which can greatly reduce the waste of resources and the consumption of labor costs.