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对近几年在国外获得迅速发展的新型轧辊——液压胀形轧辊的胀形凸度进行了弹性有限元分析,提出了受动应力边界条件逼近真实应力边界条件这一新方法。本文的有限元计算结果与实验结果符合。某些结论可用于指导液压胀形轧辊系统的开发与应用。 相似文献
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液压胀形轧辊胀形凸度的弹性有限元分析 总被引:6,自引:0,他引:6
对近几个在国外获得迅速发展的新型轧辊-液压胀形轧辊的胀形凸度进行了弹性有限元分析,提出了变动应力边界条件逼近真实应力边界条件这一新方法。本文的有限元计算结果与实验结果符合。某些结论可用于指导液压胀形轧辊系统的开发与应用。 相似文献
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针对大型封头单件,小批量生产模具费用高、生产成本高的问题,设计并实施了封头无模液压胀形的工艺试验,获得内压与封头高度的关系,确定了封头无模液压胀形的可行性;取得了大型封头无模液压胀形的基础数据,为类似容器成形提供一定的依据. 相似文献
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对管件的液压胀形工艺进行了研究,在此基础上以消音管为例进行了液压胀形数值模拟。基于Dynaform仿真软件,分析了消音管的成形过程,并对其成形极限和厚度变化情况进行了研究。针对液压胀形过程中出现的胀裂缺陷,通过优化加载路径等得到了合格的消音管成形状态,零件的最大变薄率为29. 6%。在数值模拟的基础上,根据最佳工艺方案进行了实际液压胀形试验,比较了仿真结果与试验结果的零件厚度,其相对偏差均在3%以内,并且相对变化趋势一致。研究结果表明,基于数值模拟的液压胀形仿真分析可以准确预测零件成形状态,从而提升设计生产效率。 相似文献
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三通管复合胀形与轴向压缩胀形工艺研究 总被引:4,自引:2,他引:2
采用显示动力分析软件ANSYS/LS—DYNA建立复合胀形三维有限元模型,深入研究了三通管液压胀形过程中应力应变分布规律,系统比较了轴向压缩胀形和复合胀形过程中应力应变变化规律、胀形支管高度、壁厚分布的差异。研究表明:复合胀形较轴向压缩胀形应力应变分布更均匀、壁厚分布更均匀、更易获得较大的支管高度。 相似文献
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W. N. Lambert E. S. Madrzyk F. E. Gibson 《JOM Journal of the Minerals, Metals and Materials Society》1960,12(11):857-860
To date there has been no completely satisfactory method for determining the drawability of a sheet. Employing a hydraulic bulge tester, it is possible to utilize the instability point of a metal under biaxial tension as a sensitive criterion of drawability. 相似文献
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Q. Pang Z. L. Hu X. Pan X. Q. Zuo 《JOM Journal of the Minerals, Metals and Materials Society》2014,66(10):2137-2144
In this article, the large-diameter thin-walled aluminum alloy tubes were produced using a hybrid process combining friction-stir welding (FSW) and spinning. For this novel process, rolled aluminum alloy sheets with a thickness about 2–3 times the wall thickness of target tube, were FSW to form cylinders, and then the cylinders were subjected to spinning to get thin-walled aluminum alloy tubes. Both experimental and simulation study were conducted to investigate the deformation characterization of the FSW tube during hydraulic bulge testing, and the stress and strain states and thickness distribution of the FSW tube were investigated. It was found that the common defects of FSW tube can be significantly improved by specific welding devices. The ductility of the tube is considerably improved with nearly two times higher bulge ratio than as-spun tube after annealing treatment at 300°C. But the annealed tube still shows a high nonuniform wall thickness distribution due to the inhomogeneous deformation characteristics. With increasing deformation of the tube, the gap between the hoop and axial stress for the weld and base metal (BM) decreases. However, the hoop and axial stress of the weld are always greater than those of the BM at the same pressure. 相似文献
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为了从工艺上提高双金属板成形精度,通过实验结合有限元分析的方法探究了不同工艺参数对成形精度的影响,研究表明:成形角度和成形深度分别是影响底部精度和侧壁精度的最关键因素,当成形角度由30°增大至60°时,底部鼓包高度降低29%,侧壁鼓凸量增加18.5%;当工具头直径由10 mm增大至20 mm时,底部鼓包高度下降13%,侧壁鼓凸量下降16%;当下压量由0.5 mm减小至0.2 mm时,底部鼓包高度下降24%,侧壁鼓凸量增加18.3%;最后优选了合理的工艺参数,使得底面鼓包高度下降49%,侧壁鼓凸量下降41%。 相似文献
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建立了转子屏蔽套真空热胀形过程的二维轴对称有限元模型。借助非线性有限元软件MSC.Marc的二次开发功能,将Hastelloy C-276合金的蠕变本构模型与真空热胀形过程的有限元模型相结合,模拟了转子屏蔽套的真空热胀形过程。计算了真空热胀形过程中转子屏蔽套和模具内部的瞬时温度场和径向位移场,预测了转子屏蔽套的胀形量。研究了模具厚度、保温时间和保温温度等工艺参数对转子屏蔽套真空热胀形胀形量的影响。开展了真空热胀形工艺实验,模拟结果与实验结果吻合较好。 相似文献
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F.S. Jarrar F.K. Abu-Farha L.G. Hector Jr. M.K. Khraisheh 《Journal of Materials Engineering and Performance》2009,18(7):863-870
High-temperature bulge forming of AA5083 aluminum sheet was simulated with the commercial finite element (FE) code ABAQUS™.
A material model that is strain rate sensitive and accounts for strain hardening and softening was used. Results were compared
with data from AA5083 bulge forming experiments at 450 °C where the gas pressure was a prescribed constant value. The results
show that the material model is capable of predicting the deformation and thinning behavior at different constant pressure
levels. In ancillary simulations, time-varying pressure profiles were computed (rather than prescribed) with an internal ABAQUS™
routine that attempts to maintain the strain rate at the bulge dome pole within a specified range. The time-varying profiles,
for which no experimental AA5083 bulge forming data exist, can be programmed into existing bulge testing instrumentation to
validate the associated predictions of bulge dome height and thinning. The present effort represents a necessary step toward
predicting gas pressure profiles by coupling the pressure profile with a desired sheet deformation rate. 相似文献
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钛合金筒形件真空热胀形壁厚效应的数值模拟 总被引:1,自引:0,他引:1
建立了钛合金筒形件真空热胀形的二维非线性热力耦合有限元模型。使用有限元软件MSC-Marc对钛合金简形件真空热胀形过程进行数值模拟。计算了钛合金筒形件真空热胀形过程的温度场和变形场,并进行了相应的实验验证。模拟结果与实验结果吻合较好。用建立的模型对真空热胀形过程中钛合金筒形件壁厚效应进行数值模拟,讨论了一定工艺条件下钛合金筒形件壁厚与弯曲角度、胀形量和残余应力之间的关系,为实际生产中制定和优化钛合金筒形件真空热胀形工艺参数提供理论与实践依据。 相似文献
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