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.



Analysis of Quenching Stresses in 35CrMo Axle


 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


 The Application Characteristics of Disc Brake Disc



橡胶弹性车轮的运用特点(Application and characteristics of rubber elastic wheels)




我公司1676mm轨距25吨轴重转向架产品完成设计工作


      应阿根廷客户的要求,瑞铁股份与阿根廷客户签署了110组转向架的设计、生产、交付和服务协议,为其现有车辆更换转向架。

阿根廷客户与我公司的合作时间较长,在长期的合作当中,对瑞铁股份的技术能力、生产能力较为了解,与我司建立了良好的沟通渠道。双方彼此拥有良好的互信基础。在双方共同签订了合同之后,瑞铁股份技术部随即组织转向架工程师成立了项目组。在项目开始之初,技术部在报请公司领导批示后,设定了该项目的四个主要目标:1、满足客户需求,充分考虑产品实际使用环境,完成转向架系统设计;2、在确保安全的前提下,结构上要优于客户现有产品;3、完成新加入的技术人员的培养,使其具备转向架设计工作及验证、测试工作的能力;4、践行IRIS体系,应用PDM系统,提高项目管理能力,确保该项目的时间、质量、费用控制在设定范围内。

在确定了上述项目目标的情况下,项目组首先与客户进行多次交流沟通。在前期了解的客户需求的基础上,组织了内部设计评审、专家评审、客户评审等多次评审,最终确定了最终的设计方案,并在根据客户的实际使用环境,对产品细节进行了优化设计。

经过验证,该转向架摇枕、侧架强度疲劳均符合设计预期,已形成验证报告。截止本文发稿为止,该转向架的动力学性能的计算也已经结束,生产图纸已进入校对审核环节,生产的前期准备工作已经开始。

该转向架是瑞铁股份独立研发设计的一款产品,填补了公司在宽轨转向架设计方面的空白。通过该产品设计工作的成功实施,满足了客户需求,最终产品在结构上优于客户已有产品,锻炼了新的团队成员,确保项目在限定范围内完成。瑞铁股份的技术团队,在挑战与机遇中经受住了考验,实现了自身的成长。



基于有限元法的通用货车车轮强度计算及评定


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

劳强度评定。计算结果表明,车轮的静强度和疲劳强度均满足标准规定的设计要求。



Guests from Finland visit Railteco factory


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!



Design of railway bogies with EN 13749




How bogies work