【作者】 张晖；

【导师】 刘志明；

【作者基本信息】 北京交通大学 ， 车辆工程， 2006， 硕士

【摘要】 随着货车快速化、重载化的发展,车轮故障已成为影响货车发展的主要因素,其中φ840D车轮辐板孔裂纹问题尤其突出,调查表明,该型车轮有15-20%存在长度不等的辐板孔裂纹。所以研制一套车轮辐板孔加工设备就显得很有意义。本论文采用有限元数值模拟技术,对各种铣削类型的φ840D车轮的机械应力及热应力进行了仿真研究,并且在此基础上分析了加工的可行性。本文首先对车轮进行了初步的失效分析,从金属基体组织、化学成分及力学性能方面排除了使得车轮幅板孔裂纹萌生的原因,将失效原因圈定于车轮的运行工况情况下。其次,本文就沿辐板孔两边各铣削0、5、10、15、20mm情况下φ840D车轮的机械工况应力及常用制动及坡道制动工况下的热应力进行了数值模拟,分析了加工的可行性。再次,根据车辆段和车辆厂实际生产情况,设计了一套车轮幅板孔铣削和滚压设备。最后,应用巴克豪森法对滚压后辐板孔表面残余应力进行了测量,并就残余应力对疲劳寿命的影响进行了评估。本论文共有图74幅,表11个,参考文献30篇。更多还原

【Abstract】 With the increasing of the speed and the loading of the freight train,wheel failure has been the main factor which affects the development of freight train and the problem of the holes on the web ofφ840HD wheel is especially extrusive.There are 15-20% unequal length plane hole cracks in this type of wheel, so it is significant to develop the machining equipment for the holes on the web ofφ840HD wheel.By using the FEA method, the mechanical stress and the heat stress of differentφ840D wheels are simulated, and the feasibility to the machining is analyzed.Firstly, primary failure analysis of wheel is put in practice in the paper. The reasons in aspects of metal matrix、chemical constitution and mechanical property are eliminated in crack initiation of wheel plane hole through analysing, and failure reasons are limited in the work conditions of the wheel.Secondly, the mechanical stress and the heat stress of theφ840D wheel which is milled 0、5、10、15、20mm in conditions of service braking and descent braking are simulated by FEA. Then the feasibility to develop the machining equipment for the holes on the web is analysed .Thirdly, develop a suit of machining equipment for the holes on the web ofφ840HD wheel on the basis of the conditions of the car repairing works.Finally, the distribution of the residual stress on the holes on the web is measured by magnetic elastic method. and the influence of the residual stress on the fatigue life-span of the wheel is discussed.更多还原