Composite Extrusion of Thin Aluminum Profiles with High Reinforcing Volume
Composite Extrusion of Thin Aluminum Profiles with High Reinforcing Volume
复制标题
高补强体积薄铝型材的复合挤压
DOI：
10.4028/www.scientific.net/kem.554-557.801
复制
发表时间：
2013
期刊：
影响因子：
--
通讯作者：
A. Tekkaya
中科院分区：
文献类型：
--
作者：
D. Pietzka;N. Ben Khalifa;Stephanie Gerke;A. Tekkaya
各种不同截面的挤压铝型材主要用于运输工具的轻量化结构。例如，飞机机身中的纵梁型材或火车和汽车底盘中的型材。目前，轻量化结构的质量减轻是实现低油耗和低二氧化碳排放的一个重要问题。随着铝型材比例的增加，由于铝的密度较低，与钢件的应用相比，结构的质量可以大大减少。然而，这也伴随着诸如材料的比刚度和强度较低等缺点。在不显著增加铝型材重量的情况下改善其机械性能的一种可能性是在挤压过程中嵌入增强元件。特殊的分流挤压模具用于以高强度钢丝的形式输送增强元件，与铝材料流动分开。在模具的焊接室中，两种材料粘结在一起形成复合型材。为了实现该技术在轻量化应用方面的高度优势，目标是高强度的铝型材。可以通过大量的加强元件或通过减小型材壁厚来达到相对较高的加强体积。加强件数量较多，导致型材横截面中单个件之间的距离较小。本文将给出试验和数值分析的结果，以确定加固元件之间的最小距离和最小型材厚度。在试验中，考虑了剖面截面和剖面厚度中元素的不同布置。对影响工艺稳定性的主要工艺参数进行了分析，得出了制造高增强体薄型材的工艺窗口。
Extruded aluminium profiles with a variety of different cross-sections are mainly used in lightweight structures for transportation means. Examples are stringer profiles in the fuselage of airplanes or profiles in chassis of trains and cars. Nowadays, the mass reduction of a lightweight structure is an important issue to achieve lower fuel consumption and CO2 emissions. With an increased portion of aluminium profiles the mass of structures can be reduced considerably in contrast to the application of steel parts, due to the lower density of aluminium. However, this is coupled with disadvantages such as the lower specific stiffness and strength of the material. One possibility to improve the mechanical properties of aluminium profiles without a considerable increase of their weight is the embedding of reinforcing elements during the extrusion process. Special porthole extrusion dies are used to feed reinforcing elements in form of high strength steel wires separate from the aluminium material flow. In the welding chamber of the die both materials bond together to a composite profile. To achieve a high advantage of the technology for lightweight applications a high reinforcing volume of aluminium profiles is targeted. A comparatively high reinforcing volume can be reached either by a high number of reinforcing elements or through a reduction of the profile wall thickness. A high number of reinforcing elements leads to a small distance between the single elements in the profile cross-section. The paper will show the results of an experimental and numerical analysis which were carried out to determine the minimum distance between the reinforcing elements as well as the minimum profile thickness. In the trials different arrangements of the elements in the profile cross-section and profile thicknesses were considered. Main parameters which have an influence on the process stability were analyzed and a process window for the manufacture of thin profiles with high reinforcing volume was deduced.
挤压型材中嵌入高强度增强材料的实验研究
影响因子：
4.1
作者：
M. Schikorra;A. E. Tekkaya;M. Kleiner
通讯作者：
M. Kleiner