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耐热铝合金FVS0812板的成形性能差,拉深成形球面形零件更是困难.本文在实验研究的基础上提出了一种新型的拉深成形工艺,即包覆拉深,采用该工艺成功拉深出相对厚度小的球面形耐热铝合金零件.该工艺可以有效地防止皱曲和破裂的产生,可以使板料的变形均匀分散,从而提高板料的冲压成形性能.包覆拉深工艺是一种适合于低塑性材料拉深成形的工艺方法. 相似文献
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板料成形过程模具圆角摩擦测试实验装置的研究 总被引:2,自引:0,他引:2
板料成形研究中的一个难点是如何采用实验方法定量测定板料成形过程中板料与模具之间的摩擦系数.通过对板料成形时的变形特点进行分析,提出一种新的板料成形过程模具圆角摩擦测试实验方法,并研制出相应的摩擦测试实验装置.该实验装置考虑了板料成形时周向收缩、厚向增厚的变形特点,能够在线测试出室温和加热状态下板料成形过程模具圆角处的摩擦系数.摩擦测试结果表明,所研制的摩擦测试装置具有灵敏度高、可重复性好、使用方便的特点,为深入研究板料成形过程中摩擦系数随工艺参数的变化规律提供了实验手段. 相似文献
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曲面零件成形的数值模拟分析 总被引:1,自引:1,他引:0
运用板料成形有限元分析软件Dynaform,对曲面零件进行了多次拉深成形工艺方法的有限元模拟分析.通过计算机模拟技术的应用,对优化板料成形的工艺参数、改进工艺等具有较好的指导作用. 相似文献
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板料超塑性胀形成形是一种全新的金属成形工艺.用Pare-Stamp2G板料成形数值模拟软件对一个实际成形件的超塑性胀形过程进行了数值仿真,分析了超塑性胀形成形变形过程中成形件的应力、应变、摩擦和厚度分布,研究了超塑性胀形过程中金属变形规律和工艺参数对成形过程的影响.结果表明,Pam-Stamp 2G板料成形数值模拟软件是超塑性胀形成形工艺应用到实践中的有效分析工具. 相似文献
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粘性介质压力成形(Viscous pressure forming,VPF)适合于高强度难变形材料钣金零件的制造。本文应用有限元商业软件DEFORM^TM进行模拟,对比分析采用粘性介质压力和刚性凸模成形高温合金波纹形薄壁件过程中材料危险点的变化。发现前者板料成形的危险点会发生转移,释缓了应力集中,降低了缺陷了发生的可能性。因此,有利于提高板料的菜性。 相似文献
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Development of multistage sheet metal forming analysis method 总被引:1,自引:0,他引:1
The multistep sheet metal forming process for axisymmetric shapes has been modeled employing a simplified finite element analysis
method. The analysis is based on the idea of dividing the deformation history into several steps while applying the total
strain theory of plasticity in each step. An algorithm has been developed which satisfies the potential energy minimization
process at the entire nodal point grouping in each step of the forming process. Although numerical solutions have been obtained
up to a four-step process, there are no inherent limitations in the basic methodology to extend it to any number of steps.
The assumption of proportional loading in each step of forming was carefully examined by comparing the computed principal
strain ratios with those of experimentally observed values. It was found that some regions of the sheet material undergo nonproportional
straining; consequently, a single-step approximation for a multistage forming process may not give a valid result. Sensitivity
of the new model to the number of intermediate steps has also been examined. It is concluded that the new model is a good
approximation of the multistage sheet forming process. 相似文献
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基于有限元分析的覆盖件拉延筋设计与优化 总被引:1,自引:0,他引:1
结合等效拉延筋模型,采用基于有限元逆算法的三维有限元分析软件,对汽车后窗内板的拉延成形进行模拟。在确定合理的等效拉延筋阻力后,通过适当的优化算法对拉延筋的真实几何结构进行优化设计。并通过UG二次开发技术,获取优化的拉延筋几何参数和位置,在拉延件上生成真实的拉延筋模型。 相似文献
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金属板材数控渐进成形技术及加工轨迹坐标对位研究 总被引:1,自引:0,他引:1
金属板材数控渐进成形技术,是一种通过三轴数控成形机对金属板材进行逐层辗压而成形工件的柔性加工技术。本文探讨了金属板材数控渐进成形技术的过程、原理,同时,为了有效地排除成形过程中坐标对位对零件上出现的拉裂、材料堆积、材料硬化等现象的影响,本文提出了一种基于机器视觉的非接触式加工轨迹坐标对位方法,完成了金属板料数字化渐进成形中支撑模型的非接触式高精度快速定位。 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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板料冲压成形毛料计算方法研究进展 总被引:8,自引:2,他引:6
较准确地计算毛料外形,可以提高板料的可成形性、材料利用率和生产率。综述了板料冲压成形毛料计算的各种方法,提出了板料冲压成形毛料计算今后的研究发展方向。 相似文献
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Ravi Verma Louis G. Hector Paul E. Krajewski Eric M. Taleff 《JOM Journal of the Minerals, Metals and Materials Society》2009,61(8):29-37
Finite element (FE) simulations will be vitally important to advancing magnesium alloy sheet forming technologies for vehicle
component manufacturing. Although magnesium alloy sheet has been successfully formed into complex components at high temperatures,
material constitutive model development for FE simulations has not kept pace with the needs of forming process design. This
article describes the application of a new material constitutive model in FE simulations for hot forming of magnesium AZ31
alloy sheet. Simulations of forming both simple geometries from laboratory studies and complex parts from production trials
are presented and compared with experimental results. 相似文献
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A. Petek 《CIRP Annals》2009,58(1):283-286
Before starting, the production forming processes require real experiments in order to accurately define forming limits. For this reason and because incremental sheet metal forming technology requires a relatively long production time, an autonomous on-line system for fracture identification has been developed. The system is a versatile tool for the identification of the location and time of the occurrence of the fracture, without human influences or oversight. The system is based on an investigation of the forming forces, responsive to very small variations, appearing during the forming process, and works effectively with different material types, material thicknesses and product shapes. 相似文献