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钣金凸包具有提高板材刚度的作用,应用广泛。应用Deform有限元软件仿真分析了钣金凸包冲压成形过程中应力、应变的分布规律,以及板料载荷与速度场的变化规律。通过仿真分析,确认冲压成形过程中板料与凹模接触处的应力值减小,冲压成形完成时板料与凸模接触处的应力值最大,边缘处的应力值为0。冲压成形过程中,凸凹模刃口处应变值最大,板料载荷则先较大波动,后平稳增大,最后急剧增大。试验结果与仿真分析结果的误差在1%内,验证了仿真分析准确可靠。 相似文献
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针对复杂钣金产品在设计阶段无法凭经验准确预测成形质量的情况,以摩托车排气管为例,通过四边形网格的划分,设计合理的截面线创建出凹模有限元模型,采取“一步成形法”计算出产品坯料,通过设置如压边力等冲压工艺参数,模拟计算得到产品的成形极限图FLD和厚度分布云图,通过分析为进一步模具设计提供参考. 相似文献
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杆系柔性成形模具及其板成形加工关键技术 总被引:5,自引:0,他引:5
提出了一种可重构、低成本、高效率的板件成形加工模具———杆系柔性成形模,该装置可以快速重构各种形状的板件成形加工模具。详细地分析了杆系柔性成形模的结构及其重构方案,采用可更换的“变形冲压头”与离散杆配合,较好地构成模具成形面,保证板件有较好的成形精度;提出了一种新颖的板成形方法———模内压板与成形复合工艺,通过这种工艺方法与杆系柔性成形模相结合,可以抑制板件在成形过程中的受压屈曲与起皱,并可以减小成形板件的回弹量。该模具对复杂曲面板件的成形加工具有明显的优越性。 相似文献
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采用Dynaform软件对某汽车油底壳的拉深成形过程进行了数值模拟.研究了压边力、凹模圆角半径以及有无拉延筋时对零件冲压成形的影响,通过FLD,厚薄图和成形结果对比,调整成形时压边力和凹模圆角半径,得到了优化的压边力和凹模圆角半径,为同类零件以及模具的设计提供参考. 相似文献
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1.问题的提出膜片是5600系列膜式感温探测器内部零件,如图1所示,材料为黄铜,料厚0.04mm,直径40.5mm。要求零件成形后无拉裂现象,波纹表面无凸凹点,波纹深度一致,切口整齐无毛刺。最初模具由美国进口,模具结构如图2所示,模具用在冲制机上。工作时,气缸推动下模向上运动,上升到规定的高度后,落料凸模9和落料凹模3先冲出毛坯,紧接着凸模波纹成形模芯6和凹模波纹成形芯子10对制件成形。该模具在最初的生产中工作基本正常。但使用一段时间后, 相似文献
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Electromagnetic blank restrainer (EMBR) is a new technology that was recently developed to control material movement in sheet metal forming processes. Magnetic attraction on the ferrous sheet metal is the intrinsic property of EMBR. Such magnetic force is quantified using Maxwell's stress tensor to assess the feasibility of EMBR in the sheet metal forming process. The 3D finite element analysis (FEA) of an electromagnetic system is conducted to determine the distribution of magnetic flux density on contacting surfaces of the sheet metal. The distribution is then used to estimate the magnetic force. Experiments have been conducted to measure the magnetic force and compare with results from the FEA. Biaxial-loading apparatus has been built to measure restraining forces on the sheet metal with blankholder, drawbead, and EMBR. All the restraining forces are put together in a chart to see where each method stands with respect to one another. In order to evaluate the quality of forming with each method, an experimental die has been built. The die forms a channel in a single stroke and provides a direct indication of how each restraining method controls blank movement in the die. The real advantage of EMBR lies in the effectiveness of force control and its flexible location in a sheet metal forming die. To prove this, a prototype has been built in a tryout die where house appliance panel is formed with blankholder and EMBR. EMBRs are locally installed in the die and actively controlled during the forming process. The part formed with EMBR shows a significant improvement in the forming quality. At the end of this paper, two immediate impacts that EMBR can bring to the sheet metal forming industry are also discussed. 相似文献
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Liu Jie Mo Jianhua Department of Advanced Manufacturing Technology Engineering Shenzhen polytechnic Shenzhen China State Key Laboratory of Plastic Forming Simulation Die & Mould Technology Huazhong Universty of Science Technology Wuhan China 《机械工程学报(英文版)》2004,17(2):230-232
Sheet metal dieless forming is a new metal forming technology. This technology adopts theprinciple of rapid prototyping technology, so it can form sheet metal parts without traditional die andmoulds. According to the charateristic of sheet metal dieless forming technology a new way of toolpath generation based on the STL file for sheet metal dieless forming is proposed. 相似文献
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板料成型数值模拟技术在工艺方案预测、毛坯尺寸估算和优化模具设计等方面具有重要的作用。板料成型模拟软件 Dynaform 具有强大的板料成型分析功能及前、后处理功能,主要用于板料成型工艺中模具的设计与开发。本文以汽车多角弯曲件为研究对象,根据板料成型特点,采用 Dynaform 软件,对零件冲压过程进行了成型模拟和回弹分析,确定了最佳工艺参数,优化了模具结构,完成了模具设计,改变了传统的依靠经验或反复试验和试模的模式,缩短了开发周期,提高了设计可靠性,降低了模具成本。 相似文献
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板料固体颗粒介质成形新工艺及其数值模拟 总被引:7,自引:3,他引:4
在板料成形技术中,板料软模成形是板料成形工艺中发展最快的工艺。但传统的板料软模成形工艺存在着许多缺点。为此,提出了既能克服现有软模成形工艺的缺点,又汲取各自优点的新的软模成形工艺——板料固体颗粒介质成形新工艺。板料固体颗粒介质成形新工艺是采用固体颗粒介质代替刚性凸模(或弹性体、液体)的作用对板料进行软模成形的先进工艺。该工艺具有模具结构简单,零件表面质量好,能够有效提高板材成形极限,节省多套模具和设备等优点。应用本工艺成功试制出深曲面类典型零件。通过将固体颗粒介质作为连续体介质处理,建立了子午面为抛物线形件的有限元模型。模拟和实测结果对比表明,应用连续体材料模型的模拟结果和实测结果较为接近。 相似文献
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随着航空发动机的不断发展提高,发动机上的钣金冲压零件的壁厚越来越薄,零件形状越来越复杂,尺寸精度要求越来越高,零件成形难度也越来越大。在钣金冲压成形过程中,经常会发生板料成形回弹、起皱和开裂等现象,这些现象直接影响到冲压零件的成形质量。隔热环是典型的薄壁钣金件,本文通过板料成形CAE软件Dynaform,模拟分析零件成形过程并指导零件成形,确定合理的成形工艺方案。 相似文献
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FASTAMP-NX是一款由华中科技大学材料成形与模具技术国家重点实验室开发的专业板料成形模拟软件,文中介绍了基本该软件为使用NX进行金属冲压件成形和冲压件模具制造的工艺分析及设计步骤和方法。 相似文献
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Harish Kumar Nirala Prashant K. Jain J. J. Roy M. K. Samal Puneet Tandon 《Journal of Mechanical Science and Technology》2017,31(2):599-604
Incremental sheet forming (ISF) is a recently developed manufacturing technique. In ISF, forming is done by applying deformation force through the motion of Numerically controlled (NC) single point forming tool on the clamped sheet metal blank. Single Point Incremental sheet forming (SPISF) is also known as a die-less forming process because no die is required to fabricate any component by using this process. Now a day it is widely accepted for rapid manufacturing of sheet metal components. The formability of SPISF process improves by adding some intermediate stages into it, which is known as Multi-stage SPISF (MSPISF) process. However during forming in MSPISF process because of intermediate stages stepped features are generated. This paper investigates the generation of stepped features with simulation and experimental results. An effective MSPISF strategy is proposed to remove or eliminate this generated undesirable stepped features. 相似文献