Enhancement of joinability and joint characteristics in mechanical joining processes by tailor heat-treated aluminium semi-finished products

通过定制热处理铝半成品，增强机械连接工艺中的可连接性和连接特性

• 批准号: 454200985
• 负责人: Professorin Dr.-Ing. Marion Merklein
• 金额: --
• 依托单位: Lehrstuhl für Fertigungstechnologie (LFT)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2021
• 资助国家: 德国
• 起止时间: 2020-12-31 至 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/454200985?language=en
• 关键词: Enhancement; joinability; joint; characteristics; mechanical

The increasing demands on the automotive industry to reduce the vehicle weight and simultaneously increase the crash safety require new design approaches. A material mix of steel and aluminum with increased strengths provides a possible solution for both problems. However, a material mix is also associated with new challenges for joining technology. In this context the use of mechanical joining processes has been intensively investigated in recent years. However, as it is known from the state of the art, the joining of high-strength materials is not yet unlimited possible. Therefore, the aim of the research project is the enhancement of joinability and the resulting bonding strength of high-strength dissimilar materials by the use of a local short-term heat treatment. The softening effect that occurs during the short-term heat treatment of aluminum alloys of the 7000 series can be used to improve the material flow of the high-strength aluminum material located on the punch side. Based on fundamental scientific investigations, the influence of tailor heat-treated blanks on the joining process and on the bonding strength of the joining point will be analyzed. This represents a new field of application for tailor heat-treated semi-finished products, which until now have only been used to expand the forming limits in part manufacturing. By analyzing the complex material flow in the shear-clinching process, a holistic process understanding will be established. Taking into account the interactions involved, an ideal strength distribution in the joining zone should be determined based on numerical models of the short-term heat treatment and the shear-clinching process. By means of experimental investigations the numerical results should be validated and the mechanical properties and the joint strength should be identified.

对汽车行业的需求越来越多，以减轻车辆的重量并同时提高碰撞安全性需要新的设计方法。钢和铝的材料混合具有增加的强度，为这两个问题提供了一种解决方案。但是，材料组合也与加入技术的新挑战有关。在这种情况下，近年来对机械加入过程的使用进行了深入研究。但是，正如从最新的状态中知道的那样，高强度材料的连接尚未无限。因此，研究项目的目的是通过使用局部短期热处理通过使用局部短期热处理来提高可加入性和高强度不同材料的结合强度。 7000系列的铝合金的短期热处理期间发生的软化效果可用于改善打孔侧的高强度铝材料的材料流量。基于基本的科学研究，将分析量身定制的热处理空白对联接过程和联合点的粘结强度的影响。这代表了量身定制的半生产产品的新应用领域，到目前为止，该产品仅用于扩大部分制造的形成极限。通过分析剪切临床过程中的复杂材料流，将建立整体过程的理解。考虑到所涉及的相互作用，应根据短期热处理和剪切临床过程的数值模型来确定连接区的理想强度分布。通过实验研究，应验证数值结果，并应鉴定机械性能和关节强度。