The Optimized Research On Technological Parameters Of Wheelset Mounting

On the train running, the wheelset bears vibration, torsion, alternation load and so on, sothe contact surface of axle and wheel, owing to stress concentration and uneven distribution,produces wear and fatigue cracks and other damage, then causes fatigue cutting axle, whichtends to serious result. The life of wheelset is determined by the quality of the contact surfaceof wheelset, which is determined by technological parameters of wheelset mounting, so Theoptimized research on technological parameters of wheelset mounting can improve the qualityof the contact surface of wheelset and extend the life of wheelset and ensure the safety of thevehicle operation on overloading or high-speed.Because wheelset is connected by interference fit, it is important to calculate correctlycontact stress and determine the distribution of contact stress. This paper which divides intosolid-axle and hollow-axle deduces analytical solutions for displacement and stress on theplane strain and space axial symmetry of smooth contact and entire contact, then comparesdifference of several methods. Analytical solutions are presented by establishing the boundaryconditions to the fringe stress concentration, then analyses the causes of it and proposes somemethods to reduce stress concentration.Based on finite element theory and applied ANSYS software, analyses the effect oftechnological parameters of mounting which Includes interference quantity and frictionalcoefficient and mounting speed for contact stress and Calculates contact stress which iscompared to analytical solutions, then analyses advantages and disadvantages for finiteelement solutions and analytical solutions on design and calculation of interference fit. On thebasis of the above analysis, analyses further the effect of cylindricity and roundness andsurface roughness for contact stress.Finally, the reasonable range of interference quantity and contact surface roughness andthe requirements of roundness and cylindricity and the size of mounting speed are presented,which gives theoretical basis to the design of wheelset.