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Production of bead-shaped parts by cold extrusion of semi-finished products fabricated by composite hot extrusion

复合材料热挤压制造的半成品冷挤压生产珠状零件

基本信息

批准号：
404239924
负责人：
Professor Dr.-Ing. Mathias Liewald
金额：
--
依托单位：
Institut für Umformtechnik und Leichtbau (IUL)
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2018
资助国家：
德国
起止时间：
2017-12-31 至 2020-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/404239924?language=en
关键词：
Production bead shaped parts cold

项目摘要

The combination of different materials in the forming process can be used to adjust new product properties, such as the local increase of strength or wear resistance, heat or electrical conductivity. In studies on continuous composite extrusion, a material bond between aluminum matrix and steel wire could be produced. In investigations on composite extrusion with discontinuous reinforcement elements, only the quality of the embedding was examined by light microscopic images. Investigations on a material bond of the composite partners have not yet taken place for discontinuous composite extrusion process. In addition, no geometric and material requirements, in particular the relation of the strength of individual composite partners, were defined. Until now, research on composite lateral extrusion has focused on producing a form fit. The analysis of the state of research and the own preliminary work on composite extrusion and composite lateral extrusion show the following knowledge deficits. The influencing process parameters on the material bond after the discontinuous composite extrusion have not been explored. Furthermore, there is no knowledge about the influence of the boundary layer of the semifinished product produced by composite extrusion on the boundary layer of the component after the composite lateral extrusion. These knowledge deficits justify the focus of this research project on the composite extrusion of functional or reinforcing elements in the form of tubes out of material with the same or higher strength with an aluminum core in an aluminum matrix and the subsequent processing of the hybrid semifinished product by a composite upsetting or composite lateral extrusion process. The research needs to clarify the unknown material, geometric, surface-physical and forming interactions in relation to the process design of discontinuous composite extrusion and subsequent composite upsetting or composite lateral extrusion as well as on the properties of the generated hybrid component.

不同材料在成型过程中的组合可用于调整新产品的性能，如局部增加强度或耐磨性、导热性或导电性。在连续复合挤压研究中，可以在铝基体和钢丝之间形成材料结合。在对具有不连续增强元件的复合材料挤出的研究中，仅通过光学显微镜图像检查嵌入的质量。对于不连续复合材料挤出工艺，还没有对复合材料伙伴的材料结合进行研究。此外，没有定义几何和材料要求，特别是单个复合材料伙伴的强度关系。到目前为止，复合材料侧向挤压的研究集中在产生形状配合。通过对复合材料挤压和复合材料侧向挤压研究现状的分析和自己的初步工作，指出了以下几点认识上的不足。非连续复合挤压后工艺参数对材料结合的影响还没有被探索。此外，还没有关于通过复合挤压生产的半成品的边界层对复合侧向挤压之后的部件的边界层的影响的知识。这些知识的不足证明了本研究项目的重点是功能或加强元件的复合挤压管的形式，具有相同或更高的强度的材料与铝芯在铝基体和混合半成品的后续处理的复合镦粗或复合横向挤压过程。该研究需要澄清未知的材料，几何，表面物理和成形相互作用的不连续复合材料挤压和随后的复合材料镦粗或复合材料侧向挤压的工艺设计，以及对所产生的混合部件的性能。