圆角滚压强化曲轴的疲劳强度研究

通过对形状系数的分析及试验，评定夏利曲轴不同圆角形态及强化处理的疲劳强度。圆角经深滚压处理的夏利曲轴弯曲疲劳强度有大幅度提高。     

半精加工曲轴圆角滚压工艺试验研究

对两种型号曲轴的半精加工圆角滚压工艺和疲劳强度进行了研究，结果表明，选择合造的精磨余量和滚压工艺参数，曲轴疲劳强度可持高175%左右，圆角处疲劳极限应力达552-605N/mm^2，曲轴的疲劳强度较之精磨后滚压没有下降。     

用圆角滚压加工提高曲轴强度

本文介绍了圆角滚压加工条件对弯曲疲劳强度的影响、对提高强度因素的研究以及圆角滚压加工在锻造曲轴上的应用。     

曲轴滚压校直工艺的应用与分析

本文以滚压及滚压校直工艺在ＳＯＦＩＭ发动机ＱＴ８８０－５球墨铸铁曲轴生产中的运用及相应的实验数据，分析了滚压及滚压校直工艺对曲轴疲劳性能的影响，指出通过圆角滚压，在曲轴疲劳强度的敏感区域内形成一个局部压应力场，曲轴的疲劳强度可以提高到滚压加工以前疲劳强度的１．６～２．５倍。滚压校直工艺既有利于曲轴直线度，又不破坏疲劳强度。     

用深滚压技术提高曲轴疲劳强度的应用研究

发动机曲轴圆角采用深滚压工艺可大幅提高曲轴疲劳强度。通过对370Q型汽油机、376Q型汽油机和376Q型柴油机进行的曲轴负荷分析、强度估算及弯曲疲劳强度试验表明,与未滚压曲轴相比,经圆角滚压的曲轴疲劳强度增加92．3％,安全系数由1．18增加到2．28。     

球墨铸铁曲轴滚压工艺试验研究

研究了某型号柴油机球铁曲轴滚压工艺参数对曲轴疲劳强度的影响，最佳的滚压工艺参数能使曲轴弯曲疲劳强度提高175％，圆角处的疲劳极限应力达553N／mm^2。     

圆角滚压球铁曲轴在柴油机中的应用研究

通过试验，确定了某增压中冷柴油机球铁曲轴毛坯材质和滚压工艺参数。弯曲疲劳试验及发动机台架试验表明，球铁曲轴用于该发动机是安全可靠的。确定了批量生产工艺流程，并实现了批量装机。     

基于圆角滚压工艺的曲轴疲劳行为研究

利用有限元计算软件Abaqus,采用三维显式动力学计算,模拟曲轴圆角滚压过程。利用软件自带的二次开发程序,编写数据采集程序,得到了曲轴圆角表面和内部的应力分布情况。参照曲轴真实疲劳试验,对曲轴进行模拟弯曲疲劳试验,得到不同弯矩水平下曲轴圆角应力分布情况。将模拟弯曲疲劳试验得到的圆角工作应力与滚压后的圆角残余应力进行耦合计算,获得更为准确的曲轴疲劳强度,并依此对曲轴滚压参数进行优化,优化后的曲轴疲劳极限弯矩提高15.7%。     

圆角滚压球铁曲轴在柴油机中的应用研究

通过试验，确定了某增压中冷柴油机球铁曲轴毛坯材质和滚压工艺参数。弯曲疲劳试验及发动机台架试验表明，球铁曲轴用于该发动机是安全可靠的。确定了批量生产工艺流程，并实现了批量装机。     

柴油机曲轴的制造技术

伴随着汽车工业的发展,我国的发动机曲轴生产得到较大的发展,总量已具相当的规模,无论是设计水平,还是产品品种、质量、生产规模、生产方式都有很大的发展.     

提高高速发动机曲轴修复质量的研究

首先，介绍了电弧喷涂的优越性，其次，分析了电弧喷涂修复发动机曲轴存在的问题，即采用该方法修复的发动机曲轴产生涂层脱落、颗粒磨损等现象，采用新工艺和复合材料对曲轴进行电弧喷涂，试验结果表明，修复过的曲轴使用效果良好。     

Model for dynamic behavior of the crankshaft of an air cooled diesel engine subjected to severe functioning

The dynamic behavior of the engine organs in severe conditions is complicated to identify. In this paper, the dynamic behavior of the crankshaft of the diesel engine Deutz F8L413 direct injection-type air cooled in the severe operating conditions is investigated in a 3D global model. The maximum operating characteristics of the engine are experimentally measured on a bench test equipped with a hydraulic brake. The most stressed areas of the crankshaft are determined by numerical simulations. In addition, an analysis of the fatigue behavior of the crankshaft is carried out by using two fatigues criteria. The efficiency of the model is demonstrated by comparing between the numerical results and the experimental data obtained with the natural modes of vibration test.     

粉末锻造连杆的结构强度与疲劳分析

依据有限元计算理论,使用Hypermesh网格划分软件和Abaqus高级非线性有限元分析软件,对某汽车发动机粉末锻造连杆的三维模型进行有限元静力分析。对装配完后的连杆组件的极限拉伸和压缩工况进行仿真,模拟连杆在工作过程中的接触与受力情况,确定连杆的应力分布及危险区域,并根据非对称循环下的构件的疲劳强度计算公式计算出连杆主要部位的疲劳安全系数。实践证明,此方法对连杆的研发与设计有很大的指导作用。     

内燃机零件疲劳断裂的快速诊断

基于对零件疲劳断裂断口进行的分析,在不采用电子显微镜的情况下,建立了一套零件疲劳断裂的快速诊断体系,可以快速查找发动机零件断裂原因,及时整改和预防零件故障。     

曲轴整体式磨削产生的问题与解决措施

针对曲轴修理中整体式磨削产生的曲轴磨削后装入气缸时活塞顶偏高或偏低,工作时发动机漏油,产生异响或振动,并伴有拉缸、拉瓦现象等问题,分析影响曲轴磨削质量问题的多方面因素,认为曲轴磨削前的校正方法、磨削定位基准和夹紧力、磨削精度是影响曲轴修理质量的关键,并提出了解决措施。     

Optimum design of tilting bogie frame in consideration of fatigue strength and weight

This paper addresses the use of finite-element (FE) analysis to calculate the fatigue strength of a bogie frame, for the development of tilting trains in Korea. A multi-body dynamic analysis was performed to extract the load condition by tilting on curves. Using the results of the multi-body dynamic analysis and the load scenario setout in the UIC standard, FE analysis was performed to obtain the stress distribution and to calculate the fatigue strength. An attempt was made to minimize the weight of the bogie frame using a back-propagation artificial neural network (ANN). The results of this study reveal that the stresses at some nodes are near the fatigue limit in the Goodman diagram and by using back-propagation ANN, the weight of the bogie frame could be reduced by 4.7%.     

Optimum design of tilting bogie frame in consideration of fatigue strength and weight

This paper addresses the use of finite-element (FE) analysis to calculate the fatigue strength of a bogie frame, for the development of tilting trains in Korea. A multi-body dynamic analysis was performed to extract the load condition by tilting on curves. Using the results of the multi-body dynamic analysis and the load scenario setout in the UIC standard, FE analysis was performed to obtain the stress distribution and to calculate the fatigue strength. An attempt was made to minimize the weight of the bogie frame using a back-propagation artificial neural network (ANN). The results of this study reveal that the stresses at some nodes are near the fatigue limit in the Goodman diagram and by using back-propagation ANN, the weight of the bogie frame could be reduced by 4.7%.