Interference Fit Design Assessment and Improvement for the Railway wagon Wheelset with 30 Ton Axle Weigh
Design reliability is analyzed for the interference fits of the railway wagon wheelset with 30 ton axle weigh. Aim focus on eliminating fretting fatigue damage of the wheelset. An extreme wheelset loads set is deduced by which can yields the thermal mechanical loads on the wheel same to the code AAR S 660. Integrated wheelset model of finite element method is applied to calculate the stresses on the fits to consider the physical fit relationship of wheelset, in which the rail pieces, wheels, axle, bearings, and adapters are fitted together by contact phases. It is revealed that the fits are all in the press stress states for the original design. But the stresses seem smaller than the least reasonable value for the reliable fits between wheels-axle. An improvement suggestion is provided to rise the fit scale to 0.23 mm equal to 0.01 percentage of the wheel-hub hole diameter. Calculation results verify that the press stresses have been controlled in the reasonable range.
Effect of wheelset flexibility on wheel–rail contact behavior and a specific coupling of wheel–rail contact to flexible wheelset
The f exibility of a train’s wheelset can have a large effect on vehicle–track dynamic responses in the medium to high frequency range. To investigate the effects of wheelset bending and axial deformation of the wheel web, a specifi coupling of wheel–rail contact with a f exible wheelset is presented and integrated into a conventional vehicle–track dynamic system model. Both conventional and the proposed dynamic system models are used to carry out numerical analyses on the effects of wheelset bending and axial deformation of the wheel web on wheel–rail rolling contact behaviors. Excitations with various irregularities and speeds were considered. The irregularities included measured track irregularity and harmonic irregularities with two different wavelengths. The speeds ranged from 200 to 400 km/h. The results show that the proposed model can characterize the effects of f exible wheelset deformation on the wheel–rail rolling contact behavior very well.
By using the finite element method (FEM), we comprehensively analyzed the fields of temperature, organization, and stress in 35CrMo train axles during the quenching process is conducted, and experimentally studied the formation and evolution of inner stresses in axles during the quenching process. The results show that in the quenching process, stresses on the axle surface change from tensile to compressive gradually, while stresses in the axle core change from compressive to tensile gradually. Heat stresses and the amount of martensitic transformation are all increased with the increase of cooling rate. As a result, the maximum instantaneous stresses in the axle are increased greatly when the cooling rate is increased with brine quenching. Large instantaneous tensile stress in the axle core with brine quenching is very likely to cause quench cracking and should be avoided.
The Application Characteristics of Disc Brake Disc
重载运输，是铁路运输扩能提效的有效措施，但轴重的增加导致轮轨接触应力增大，货车车轮作为货车安全运行的关键部件之一，在货车所有部件之中工作条件是最恶劣的。车辆运行中，车轮不仅要支撑重载货车的全部质量，同时要承受大量的轨道冲击载荷，这些轨道冲击和车上载荷同时对车轮持续不断的施加作用力，引起很高的机械应力，并由此造成机械损伤。本文将根据UIC 和欧洲EN 的有关标准确定车轮的机械载荷及载荷工况，考虑到轮轴过盈配合，计算了通用货车车轮的应力，对该车轮进行了静强度和疲
7th -12th September,2013 We entertain five guests from Finland，which respectively visited the production line and the control center of Railteco factory，Exchanges and learning of technical issues related to the project , it has laid the foundation for the development of the Finland marketing；This time, Also take us the biggest project for Axle,wheel and Wheelset, It it business begining of us，I believe there will be a brighter future！