Production and characterization of complex folded cellular structures made of sheet metal

由金属板材制成的复杂折叠蜂窝结构的生产和表征

• 批准号: 427257349
• 负责人: Professor Dr.-Ing. Mathias Liewald
• 金额: --
• 依托单位: Institut für Umformtechnik (IFU)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2019
• 资助国家: 德国
• 起止时间: 2018-12-31 至 2021-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/427257349?language=en
• 关键词: Production; characterization; complex; folded; cellular

By folding flat semi-finished products, three-dimensional cellular structures can be produced. Folding structures can be used in various technical fields, especially as sandwich core material between two covering sheets. Sandwich construction methods offer the possibility to put rigid, large-area components into effect. These components have considerable weight and material savings compared to conventional monolithic or differential construction methods.Today’s cellular folding structures can only be produced from initial materials with very small sheet thicknesses (s0 ≤ 0.2 mm). In addition to their use as sandwich elements, folded structures with thicker sheet metals offer considerable potential for the industrial use as cladding elements, crash and carrying structures.The cellular folding cores made of sheet metal are based on isometric folded structures. In the initial state, a mostly flat semi-finished product is formed into repeating unit cells by local bending processes around one or more bending axis orientations (BAO). Bending according to DIN 8582 takes an exceptional position, since the formation of local bending axes enables complex shaping of the workpiece (here the core), which enables an extraordinarily application and application-specific component design. The aim of the research project is the production and characterization of complex cellular structures made of aluminium or steel sheet with thicknesses greater than 0.5mm. For this purpose, a workflow is being developed that covers all aspects from the geometric and structural design to the newly developed production technologies and their technological limits to the manufacture and inspection / quality assurance of optimized structures made of sheet metal in the above-mentioned thickness range. The following sub-targets are addressed in particular: - Development and transfer of analytical design methods for folding thicker sheets - Development of methods for pre-structuring sheet metal - Process development for the production of folded sandwich cores - Modelling of the mechanical properties of sandwich panels and definition of process boundariesThe scientific findings of this project on the one hand enable a more precise estimation of the potential of folded structures made of sheet metal as a new type of core material for two-dimensional sandwich applications and on the other hand extend the basic knowledge on the behaviour and processing of sheet metal in complex, previously unfinished isometric forming processes.

通过折叠扁平的半定型产品，可以产生三维细胞结构。折叠结构可用于各个技术领域，尤其是在两个覆盖纸之间的三明治核心材料中。三明治建设方法提供了将僵化的大面积组件生效的可能性。与传统的单片或差分构造方法相比，这些组件具有相当大的重量和材料节省。TODAY的细胞折叠结构只能由具有非常小的板厚厚度（S0≤0.2mm）的初始材料产生。除了用作三明治元素外，具有厚度板金属的折叠结构为工业用途，层层元素，崩溃和携带结构提供了巨大的潜力。由钣金制成的蜂窝折叠芯是基于等距折叠结构。在最初的状态下，通过一个或多个弯曲轴方向（BAO）局部弯曲过程（BAO），将大部分平坦的半成生成产物形成重复单元细胞。根据DIN 8582的弯曲，由于局部弯曲轴的形成可以使工作场所的复杂塑造（此处为核心），因此具有出色的位置，这可以实现非常出色的应用程序和特定于应用程序的组件设计。研究项目的目的是生产和表征由铝或钢板制成的复杂细胞结构，厚度大于0.5mm。为此，正在开发一个工作流程，该工作流程涵盖了从几何和结构设计到新开发的生产技术及其技术限制到上述厚度范围内由钣金制成的优化结构的制造和质量保证的各个方面。特别是： - 用于折叠较厚的较厚床单的分析设计方法的开发和转移 - 开发用于制作床单的方法 - 生产折叠夹心芯的过程开发 - 夹心板的机械性能的建模以及夹心面板的机械性能和过程边界的定义，以构成了一种构成一部分构成的构造，从而构成了一种构成一组构成的构造，以构成一组折叠的构造，构成折叠的一部分，构成了折叠的一部分，二维三明治应用以及另一方面，在复杂的，以前未完成的等距形成过程中扩展了有关钣金的行为和处理的基本知识。