Research And Simulation Optimization Of Mechanical Properties Of Highly Wear-resistant Guide Wheels For Trams

With the development of modern industrial civilization and the unprecedented accelerat-ion of urbanization,modern trams are gradually favored by people and become an important part of the development of modern urban rail systems.Among them,modern trams with rubber wheel guides are driven by rubber tires,which have great advantages in power,braking and turning.However,due to the long-term contact between the steel guide wheel and the guide rail,the wheel and rail wear is more serious,and at the same time,the vibration caused by the wheel and rail wear causes greater friction noise.In view of the serious wear and noise problems between the wheels and rails,it is necessary to study a new type of material-oriented guide wheel with high wear resistance and vibration absorption and noise reduction effect instead of the steel guide wheel.In this paper,particle-reinforced polytetrafluoroethylene?PTFE?matrix composites are taken as the research object.First,the tribological and mechanical properties of the particle-reinforced PTFE-based composite material model were simulated.Second,the tribological experiments were carried out on the friction and wear tester with samples of different proportions,and the universal tensile tester and Shore hardness tester were used to perform tensile,compression and hardness test analysis.Finally,optimized strength check and vibration analysis of the new type guide wheel The detailed research content is as follows:?1?Among many materials,polytetrafluoroethylene?PTFE?has the advantages of good self-lubricating performance,small density,strong impact resistance and good chemical stability.Therefore,PTFE has become an indispensable material in modern science and technology,military industry and civil industry,solving many key technologies.To this end,this paper takes PTFE as the research object,and adds different reinforcing particles to PTFE in order to further obtain the material of the guide wheel with good comprehensive performance.It is mainly filled with Ni,Al and Al,and Fe₂O₃ as reinforced particles.and the PTFE-based composite material after particle reinforcement is used as a new type of guide wheel material.?2?Through friction simulation experiments,it was found that during the friction process,the junction temperature of the secondary contact area of the friction was about 500°C.After adding the reinforcing particles,the overall tribological performance of the composite material was improved;The tensile and compressive modulus were simulated and predicted,and it was found that the tensile and compressive modulus of the composite material were significantly improved after adding the reinforcing particles.?3?Through friction and wear and mechanical tests,it is found that after adding reinforcing particles,the tribological and mechanical properties of the composite material are greatly improved.Compared with pure PTFE,the wear rate is reduced by two orders of magnitude,and the wear resistance,tensile modulus,compression modulus and hardness are all improved.As the composite material of the guide wheel,the rigidity and the resistance to deformation are both improved;it is found that when the filler is 25wt.%,the friction and mechanical properties of the composite material are optimized,and the comprehensive performance of Ni and Al filler is better than that of Al,Fe₂O₃;Finally,the composite material with the best comprehensive performance is selected as the new guide wheel material.?4?Analyze the guiding principle of the rubber guide rail tram and the force of the guide wheel during operation,and analyze the tensile strength,compressive strength and vibration of the new material guide wheel.The optimized design and analysis of the guide wheel found that the natural frequency of the guide wheel became larger after optimization,which made it easier to protect the guide wheel from damage due to resonance during work,making the design of the new material guide wheel more reasonable.In this paper,the friction and mechanical properties of particle-reinforced PTFE-based composites are simulated and tested.It is concluded that when the content of reinforced particles is 25wt.%,the friction and mechanical properties are optimal.The composite material at this time is selected as the new guide wheel material.The new type of guide wheel material has good wear resistance and shock absorption and noise reduction effects,so that the problems of the traditional guide wheel can be solved.