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1.
板液压成形及无模充液拉深技术   总被引:22,自引:0,他引:22  
板液压成形技术是液压成形技术中重要的一类 ,广泛地应用于宇航、汽车等工业领域。近年来由于新材料和复杂几何形状零件的不断出现 ,更加突出此种技术的关键性。本文就板液压成形技术原理、数值模拟技术和分类进行了研究 ,探讨了此种技术将来的发展 ,介绍了基于板液压成形技术的无模充液拉深技术 ,利用实验和数值模拟技术对此技术进行了分析 ,验证了此项技术的可行性 ,并取得了较好的结果  相似文献   

2.
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   

3.
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   

4.
液压成形技术较传统的其他金属成形技术有许多优点,而国内基于该技术的实验与仿真研究相对匮乏。为研究钣金件液压成形规律,设计并搭建了用于钣金件液压成形的系统进行实验测试分析,并基于ABAQUS非线性有限元软件对钣金件液压成形进行了有限元仿真分析,通过对最小曲率半径等参数的对比研究验证了仿真分析的正确性。以此为基础,通过仿真分析研究了钣金件成形过程中压边力、摩擦系数等参数对板件厚度变化的影响规律,仿真结果表明,在该模型下压边力的最佳取值应在60~90 MPa之间;随着摩擦系数的减小,摩擦力对成形厚度的影响增大。  相似文献   

5.
对发动机盖外板充液拉伸成形过程进行了有限元仿真,以分析液压加载路径对制件成形的影响。结果表明,初始反胀使拉伸过程产生皱褶;延迟液压的加载和减小成形压力有利于制件刚度提升,而适当提早液压加载和增大成形压力有利于提升制件成形极限。  相似文献   

6.
叶勇  王金彦 《热处理》2013,(1):10-13
从铝合金的特点出发,综述了铝合金板在汽车工业中的应用现状及成形过程中遇到的难题。介绍了温成形、液压成形和变压边力技术等三种最新的成形工艺,详细论述了变压边力对铝合金成形性能的影响。此外总结了铝合金拉伸性能的某些研究成果。  相似文献   

7.
简要介绍了轿车用新材料、新工艺.内容包括,快速凝固铝合金,TiAl金属间化合物、铝蜂窝板、泡沫铝材、铝复合材料、铝拼焊冲压坯料;AVT工艺,反压力液压成形、铸锻工艺,同步成形工艺,HDT技术,半固态成形.  相似文献   

8.
AZ31B镁合金板液压-机械拉深试验研究   总被引:3,自引:1,他引:2  
对AZ31B镁合金板进行液压-机械拉深试验,分析其变形特点和液压力对其成形性能的影响规律,并对液压拉深件的破裂现象进行了分析.试验结果表明,AZ31B镁合金板在液压-机械拉深时的成形性能比普通拉深时的差,主要原因是AZ31B镁合金板本身的塑性变形能力差,液压力未能及时发挥作用.  相似文献   

9.
《塑性工程学报》2016,(3):103-107
基于工艺过程的制造成本评估方法,建立热冲压成形、液压成形、激光焊管、辊压成形、高强钢冷冲压、激光拼焊和变厚板等多种先进成形工艺的制造成本模型系统。基于该制造成本模型系统,评估了汽车B柱和副车架U型梁等零件多种成形解决方案的制造成本,并对多种成形解决方案使用性能和轻量化效果进行综合对比与分析。进行先进成形技术路线探讨,针对用户不同需求推荐合适的技术路线,支持宝钢汽车板EVI(Early Vendor Involvement)整体解决方案的提供。  相似文献   

10.
基于汽车轻量化技术,对板料液压成形(Sheet hydroforming)技术进行了研究,研究了液压成形工艺原理、液压成形工艺特点、以及液压成形模具结构设计,并对发动机盖板冲压件进行液压成形模拟实验及物理试验验证,实验和试验结果一致,均得到质量合格的冲压件。板料液压成形技术的应用,有效的促进汽车轻量化技术的发展。  相似文献   

11.
复杂冲压件液压成形装备的设计与制造   总被引:2,自引:0,他引:2  
介绍了一种板料液压成形成套装备,包括模具结构、液压控制系统和计算机控制系统。该装备具有结构简单、经济实用、可实现变压边力控制等特点,可获得高质量的复杂板料成形件。  相似文献   

12.
针对某型飞机上蒙皮零件,基于有限元分析软件Dynaform,对主动式充液成形和被动式充液成形两种方案进行了数值模拟对比分析。根据数值模拟结果,认为该零件较适合采用主动式充液成形,其次,通过修改工艺补充面和优化成形工艺参数,有效地控制零件的最大减薄量。同时,保证一定的减薄量,使板料达到塑性变形状态,从而有效减小回弹。再通过回弹分析,根据回弹量计算结果,运用Think Design软件对模具型面进行回弹补偿,将回弹量控制在合格范围内。最终通过实际试模,验证了数值模拟的准确性及适用性,加工出表面质量良好、精度满足要求的合格产品。  相似文献   

13.
Modern lightweight construction, especially in the automotive industry, requires more and more complex components, which can be manufactured in one process step using the hydroforming technology. The combination of the tube and double sheet hydroforming is a new forming process, where a tube and two blanks are formed simultaneously in a die cavity, combining the advantages of both hydroforming variants. This paper deals with the fundamental considerations and investigations related to connection between tube and double sheet. The finite element analysis and laboratory trials were used in order to design the shape of the die cavity and to avoid wrinkles, material tearing and the collapse of the tube section during forming. The paper will also illustrate an analytical model for the prediction of the edge shape in the constrained bulging of a rectangular cup together with several technical solutions, which enabled a complete forming of the investigated part. Finally, the definition of a hydroforming material factor based on the analytical model of the hydraulic bulging process enables the right choice of sheets with different material strength and thickness for the hydroforming of hybrid components.  相似文献   

14.
Hydroforming of inhomogeneous sheet pairs with counterpressure   总被引:1,自引:0,他引:1  
Double sheet hydroforming is a technology which allows to manufacture lightweight hollow components with complex geometries in one forming operation. One major challenge in hydroforming regards the manufacturing of inhomogeneous double sheet parts, i.e., of components, where the two halves are made up of different materials or have a different initial thickness. The failure mechanisms taking place in this case are due to the different amount of draw-in of material in the die during the preforming, which causes the occurrence of wrinkling in the flange, and to the different bursting pressure of the two blanks during the successive calibrating stage. An innovative strategy is proposed, in which a counterpressure is applied at the outer surface of one of the two sheets in order to compensate the different behaviors of the two forming partners, allowing thus to exploit their forming potential.  相似文献   

15.
Technology of sheet hydroforming with a movable female die   总被引:2,自引:0,他引:2  
An improved sheet hydroforming process is proposed and investigated experimentally and numerically. A movable female die keeps in contact with the deformed area of the sheet blank so that further deformation of the deformed area is restricted. Under the sealing, the sheet blank under the flange can be drawn in. So the hydroformed part has less thinning than the hydrobulge formed part only, and the limit drawing ratio of the sheet can be remarkably improved. This process is especially suitable for forming of small batch production of sheet metal parts with complicated shapes. The female die can be replaced with other female die of various shapes, and can also be made of very cheap materials such as plaster and hard wood instead of metal when the part number is very small. Thus complex-shaped sheet parts can be formed with less expensive tool systems.In this paper, the hydroforming processes of part A (without a movable die) and part B (with a movable die) were investigated by experiment and by elastoplastic FEM. The effects of various process parameters on the deformation of the sheet blanks were investigated. The forming conditions affecting wrinkling and rupture have been analyzed. The effects of friction and contacting force acting on the experimental results are also discussed.  相似文献   

16.
板料液压成形的数值模拟研究   总被引:1,自引:0,他引:1  
首先对板料液压成形技术相关知识进行了介绍,接着以阶梯圆筒形制件的液压拉伸数值模拟仿真为例,采用DYANFORM软件来说明应用数值模拟技术对板料液压成形过程进行有限元分析的具体步骤。最后,分析了板材液压成形数值模拟的特点并对板料液压成形数值模拟技术的发展趋势进行了展望。  相似文献   

17.
High strain rate (HSR) forming has been found to be able to enhance the formability of sheet metals like electro-magnetic forming. Impact hydroforming (IHF) is proposed, in which the sheet is formed with high-pressure pulse combining hydroforming and HSR forming. An IHF bulge test setup was designed, 5A06 aluminium sheet was tested with strain rate of 2 × 103 s?1 showing remarkable thickness strain increase compared with quasi-static condition. A new IHF equipment is designed, the IHF process was verified effective with the equipment, complicated aluminium aircraft sheet part with high drawing ratio was formed that cannot be formed with quasi-static hydroforming.  相似文献   

18.
Stringer sheets are sheet metal structures stiffened by bifurcations in the cross-section. In order to create spatially curved light-weight structures they may serve as preforms for sheet metal hydroforming. The stiffness of sheets altered by stringers is expected to affect the hydroforming results. In particular influences of the geometric inhomogeneity on the extent and orientation of springback are of interest. They are investigated by means of mathematical analysis and forming experiments. A modal analysis of formed stringer sheets is conducted in order to understand the different impacts of stringers on the elastic behaviour of parts and springback after forming.  相似文献   

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