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作 者:蔡宣明[1] 张伟[2] 范志强 高玉波 CAI Xuan-ming;ZHANG Wei;FAN Zhi-qiang;GAO Yu-bo(School of Science,North University of China,Taiyuan 030051,China;School of Aeronautics,Harbin Institute of Technology,Harbin 150080,China)
机构地区:[1]中北大学理学院,太原030051 [2]哈尔滨工业大学航天学院,哈尔滨150080
出 处:《车辆与动力技术》2018年第4期1-5,共5页Vehicle & Power Technology
基 金:国家自然科学基金资助项目(11602233);中北大学国防重点学科实验室开放研究基金项目(DXMBJJ2017-04);2016年中北大学校科研基金项目(110248);山西省高等学校科技创新项目(201802082)
摘 要:针对液压胀形工艺费用昂贵、结构不合理性及周期长3个急需解决的问题,应用大变形弹塑性有限元理论对某汽车后桥壳液压胀形工艺进行仿真探索研究.建立管坯、模具及挡板三维有限元模型,经计算分析,将胀形工艺加载路径分为两个工步较为合理,并分别研究两个工步加载路径、以及模具和挡板与管坯接触表面摩擦系数对胀形结果的影响.理想胀形仿真结果表明,第1步胀形工艺多项式加载路径使得轴向进给位移与管坯内部载荷压力匹配度达到最佳值,从而避免胀形过程中出现屈曲、褶皱以及破裂等失效现象;在第2步胀形工艺最优线性相关载荷作用下,管坯胀形壁厚分布均匀、最大胀形系数远小于许可胀形系数,获得了理想胀形结果,其胀形工艺加载路径可为试验研究提供重要依据.In order to solve the problem of high cost,unreasonable structure and long period of the hydraulic bulging process,this paper uses the large deformation elastoplastic finite element theory to simulate the hydraulic bulging technology of a car rear axle shell.The three-dimensional finite element model of tube billet,die and baffle is established,and it is reasonable to divide the loading path of bulging process into two steps by calculation and simulation.The influence of two steps loading paths,the friction coefficient of die and baffle and the contact surface of tube billet on the bulging results are studied.The ideal bulging simulation results show that the polynomial loading path on the first step expansion process makes the axial feed displacement and the internal load pressure matching degree of the billet to reach the best value,which can avoid the buckling,folding and rupture in the bulging process.The bulging wall thickness of tube billet is uniformly distributed under the linear correlation loading path on the action of the second bulging.The maximum bulging coefficient is far less than the permissible bulging coefficient.The ideal bulging result also shows that the loading path of the bulging process can provide an important basis for the experimental study.
分 类 号:TG386[金属学及工艺—金属压力加工]
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