共查询到18条相似文献,搜索用时 140 毫秒
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为研究基于液压成形的汽车钣金件成形规律,以汽车中空异形板件为研究对象,自行设计并搭建板材液压成形实验测试系统,以此开展板件液压成形的实验研究,借助DYNAFORM有限元软件对板材液压成形进行有限元仿真分析,通过与实验测试结果的对比,验证了建立的有限元模型与数值模拟的正确性。以此为基础,探究压边力、压边力加载路径、液室压力、压边间隙和板材与凹模之间的摩擦系数等关键工艺参数对板材液压成形厚度的影响规律,提出汽车中空异形板件液压成形工艺,为板材液压成形技术在汽车钣金件成形中的应用提供参考。 相似文献
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金属板材成形的静力隐式有限元分析与程序设计 总被引:2,自引:0,他引:2
阐述了用于板材成形过程静力隐式数值模拟的弹塑性大变形有限元方法,基于给出的方法编制了板材成形过程数值模拟软件,并对矩形板的液压胀形进行了有限元分析,计算结果与典型的实验结果吻合很好。对球形模具拉伸成形过程进行了数值,给出了计算结果。 相似文献
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介绍了树脂板多点热成形的原理,选择具有良好综合性能的聚甲基丙烯酸甲酯(PMMA)和聚碳酸酯(PC)为研究对象,测试了其玻璃态转变温度。建立了树脂板多点热成形有限元模型,得到了球形面和鞍面件多点热成形的数值模拟结果,结果表明多点热成形技术可以实现PMMA、PC等树脂板三维曲面件的高精度成形。进行了PMMA板球面件和PC板鞍面件多点热成形实验,结果表明实验件的轮廓形状较好、壁厚分布较均匀,验证了树脂板多点热成形技术的可行性和实用性。对树脂板多点热成形实验结果和数值模拟结果进行对比分析,结果表明,在合理的偏差及测量误差范围内,实验结果与数值模拟结果吻合较好,验证了树脂板多点热成形数值模拟的正确性。 相似文献
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板金液压柔性技术及其产品设计 总被引:1,自引:0,他引:1
板金液压柔性成形具有诸多的优点,受到了汽车、航空航天等领域设计和研究者的普遍重视。文章主要介绍了板金液压柔性成形技术的内涵和外延,针对所提出的无模液压柔性成形技术和复合液压柔性成形技术,从不同的工艺方法入手,基于所研制的液压柔性成形设备,介绍了相关的飞机等领域产品特点以及设计要点,并对其中的关键工艺参数进行了描述。 相似文献
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无模液压胀形技术——王仲仁教授的一项发明 总被引:3,自引:0,他引:3
介绍了无模液压胀形技术的基本原理和主要工序,对无模液压胀形技术发明以来的几个重要发展阶段进行了阐述,并对球形容器、椭球及环壳的无模液压成形过程进行了数值模拟,给出了壳体的成形规律,同时对壳体成形过程中存在的缺陷进行了准确的预报,最后给出了该技术在实际工程中的具体应用实例。 相似文献
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钣金成形过程中常会发生起皱、开裂缺陷,采用数值模拟技术进行钣金成形过程仿真,可修正模具设计,是开展精密成形的方法之一。针对模拟结果中工件出现的缺陷,提出了初步的改进方案,以橡皮囊液压成形为例,对成形过程的零件厚度变化、应力分布、起皱进行了数值仿真研究,从而控制了板料成形过程的缺陷,进一步修正了模具和板料,实现了无余量装配。 相似文献
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The further development of innovative forming processes like sheet metal hydroforming is only possible with the help of detailed knowledge about the workpiece properties and their formation depending on the particular process strategy. Up to now, the detailed understanding regarding the formation of residual stresses in hydroforming processes like the high-pressure sheet metal forming (HBU) is insufficient. Therefore, numerical (FEM) and experimental investigations on the residual stresses induced in HBU-formed workpieces have been carried out. The results show that a higher fluid pressure leads to significantly lower residual stresses in addition to an improved accuracy of form and dimensions. 相似文献
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Lihui Lang Joachim Danckert Karl Brian Nielsen 《International Journal of Machine Tools and Manufacture》2004,44(5):495-502
Sheet hydroforming has many virtues and has gained increasing interest in industries recently. In this paper, hydromechanical deep drawing (HDD) with uniform pressure onto the blank is proposed and investigated in detail both primarily in experiments and simulation. Final cups with drawing ratios of 2.46 and 3.11 were, respectively, obtained using Al–Mg–Si alloy (Al6016-T4) and soft aluminum (Al1050-H0) that have the strong anisotropic properties. The influence of process parameters on the sheet deformation was studied and the typical failure types including fracture and wrinkling were discussed. Finally, FEM was used to analyze the forming process, and the results from the FEM simulations were in good agreement with those from the experiments. 相似文献
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Springback is a really troublesome effect in sheet metal forming processes. In fact changes in geometry after springback are
a big and costly problem in the automotive industry. In this paper the authors want to analyse the springback phenomenon experimentally
in sheet metal hydroforming. Compared with conventional deep drawing, sheet hydroforming technology has many remarkable advantages,
such as a higher drawing ratio, better surface quality, less springback, better dimensional freezing and capability to manufacture
complicated shapes. The springback phenomenon has been extensively analysed in deep drawing processes but there are not many
works in the literature about springback in sheet metal hydroforming. In order to study it, the authors have performed an
accurate measuring phase on the chosen test cases through a coordinate measuring machine and the obtained measurements have
been utilised for the determination of springback parameters, taking into account the method proposed by Makinouchi et al.
The authors have focused their attention on the possibility of adopting a modified Makinouchi et al. approach in order to
measure the springback of the large size considered test cases. Through the implemented methodology it has been possible to
calculate the values of the springback parameters. The obtained results correspond to the observed experimental deformations.
Analysing the springback parameter values of the different combinations investigated experimentally, the authors have also
studied the pre-bulging influence on the springback amount. 相似文献
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