【作者】 李冰；

【导师】 孟工戈； 刘志臣；

【作者基本信息】 哈尔滨理工大学 ， 材料工程， 2005， 硕士

【摘要】 为了适应我国国民经济建设迅速发展的需要,我国铁路自1997 年起至今已进行了四次客运列车的大提速,主要铁路干线提速区段的最高运行速度已达140-160km/h,今后我国铁路旅客运输还将进一步全面提速。由于我国铁路网基本上是客车、货车共线运输的铁路网,随着客运速度的提高,要求货运速度相应提高,因此货车提速也是势在必行。21t 轴重交叉支撑转转向架是由我公司与美国标准转向架公司(SCT 公司)联合设计的、适用于在我国铁路运用的提速货车转向架,其中交叉支撑装置是引进SCT 公司的侧架下交叉支撑技术。交叉支撑装置可以提高转向架的抗菱刚度,从而提高了车辆的运行速度。交叉支撑装置是提高转向架抗菱刚度,确保转向架在质量保证期内能否安全运行的关键部件。交叉支撑装置承受的载荷又主要是车辆运行中的动载荷,因此对交叉支撑装置的制造要求非常高。本文通过对交叉杆扣板直焊缝、端头环焊缝等各部位裂纹的分析,找出了其断裂机理及与疲劳寿命的相关因素。以此为依据对交叉杆的焊接工艺进行了改进,经过细化晶粒焊接、杆身压型等工艺试验确定了相关的工艺参数。为检验工艺改进的效果,还对杆身与扣板焊缝、杆身与端头等主要焊缝做了疲劳寿命分析,进行了交叉杆实验室疲劳试验及实际运用考验。最终证明了交叉杆焊接工艺的有效性。更多还原

【Abstract】 In order to satisfy the development of Chinese national economy and construction, Chinese railway has raised its operating speed of vehicles four times since 1997, and nowadays the max. moving operating speed of rolling stocks reaches at 140-160km/h for some tangent lines. Passenger transportation will also raise its speed for coaches later. Since the infrastructure basically are required to operate for both passenger cars and freight cars, and once the passenger transportation raises its speed, then it is necessary to raise the speed of freight transportation accordingly. The frame brace bogie of 21 ton axle-load is developed through a jointly design of Qiqihar Railway Rolling Stock (Group) Co., Ltd. and Standard Car Truck Company, USA, to be suitable for the raised speed of freight transportation. Bottom frame brace system was imported from SCT and it intends to increase the anti-warp performance so that the freight car operating speed can be raised. The frame brace device is to up-level the performance of anti-warp for the bogie as a key part with a bogie for safety operation in a grantee period, and the load for frame brace is of dynamic load during freight car operation, the manufacturing quality for frame brace is highly required. This article is to confirm the corresponding factors for crack causing and the fatigue life, through an analysis of cracks at fastening plate, welding seams at the end of frame brace. The welding process is improved based on frame brace requirement, and some process parameters are confirmed after various tests. In order to verify process effectiveness, fatigue life analysis is performed for major welding seams, as well as lab fatigue test and actual operating test are performed. Finally it is proved that the welding process for frame brace is effective.更多还原