共查询到18条相似文献,搜索用时 218 毫秒
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轴对称件智能拉深系统中的神经网络参数识别 总被引:2,自引:0,他引:2
建立了轴对称拉深件的材料性能参数和摩擦系数实时识别前馈神经网络,采用LM算法优化网络,将参数识别精度提高到一个新水平,为智能化拉深成形的。实时预测和实时控制这两个基本要素提供了前提保证,为实现整个拉深成形过程的智能化控制奠定基础。 相似文献
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在分析了薄壁锥形件拉深过程中侧壁压缩失稳破坏方式后,利用薄板在板平面内难以承受压应力,锥壁纬向收缩靠经向拉伸的变形特点,根据薄壁锥形件小端危险面所能提供的最大经向拉应力,求得了锥壁纬向无压缩失稳的最大相对拉深高度;从而建立了薄壁锥形件拉深侧壁无压缩失稳的条件。针对板材性能的影响,提出了相对锥顶半径特征方程和特征值的概念。以SPCC深拉深钢板和S754铝合金板的试验表明,理论计算与实测结果相近。 相似文献
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Numerical simulation of various cross sectional workpieces using conventional deep drawing and hydroforming technologies 总被引:2,自引:0,他引:2
This study focuses on the determination of optimum sheet metal forming process and process parameters for various cross sectional workpieces by comparing the numerical results of high-pressure sheet metal forming, hydro-mechanical deep drawing (DD) and conventional DD simulations. Within the range of each cross section, depth, characteristic dimensions ratio and fillet radius have been altered systematically. Steel of types St14 and DC04 have been used as the specimen material in the numerical analyses and the experimental verification throughout the study. All numerical simulations have been carried out by using a dynamic–explicit commercial finite element code and an elasto-plastic material model. During the analyses each workpiece was simulated by the three competing processes. The results of analyses, such as sheet thickness distribution, necking, forming of radii etc., are used for assessing the success of each forming process alternative. The analyses revealed that depending on the workpiece geometry and dimensional properties certain processes are preferable for obtaining more satisfactory products. Working windows for each process have been established based on the analyzed parameters of the circular, elliptic, rectangular and square cross sectional product geometries. This data is expected to be useful for selecting the appropriate production process for a given workpiece geometry and understand the limits of each sheet metal forming processes. 相似文献
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在金属板材的电磁脉冲拉深成形中,采用一种使成形件凸缘部分的材料可以径向流动的方法。形成了一种拉深—胀形特点相结合的成形工艺,可以提高材料的拉深极限。在此基础上通过改变电压和板料直径等工艺参数,可获得更大拉深高度。 相似文献
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为了提高冲压件的成形质量,用理想的方法来确定成形质量和工艺参数之间的关系,本文将均匀设计与有限元模拟相结合对方盒件成形工艺参数进行优化,优化后的仿真结果在提高成形裕度和抑制厚度变化方面取得较理想的效果.该方法明显地减少了模拟实验次数,提高了参数优化效率,改善了板料冲压成形的仿真计算精度. 相似文献
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AZ31B镁合金薄板拉深成形模拟分析 总被引:1,自引:0,他引:1
用Dyanform软件模拟AZ31B镁合金的拉深成形过程,通过自动设置模块进行参数设置,并最终得到接近实验结果的变形过程、成形极限以及壁厚分布趋势。模拟结果表明:基于Dynaform的数值模拟可以用于镁合金的成形过程分析及试件破损预测等,对于指导拉深物理实验具有重要作用。 相似文献
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