Laser Direct Energy Deposition (DED-LB) System

新制造技术和材料主席的研究重点在于开发新材料概念，考虑使用计算机辅助和实验方法的相关制造技术。除了用于熔化和粉末冶金工艺的材料开发外，还特别关注增材制造的材料开发。所考虑的材料组包括耐腐蚀钢、碳马氏体可硬化工具钢、难熔金属、功能材料和耐磨复合材料。在未来，主席将更多地关注激光直接能量沉积（DED-LB）工艺的材料开发。除了开发适用于DED-LB工艺的材料概念外，还必须回答有关凝固过程中微观结构形成过程和交替热输入的科学问题。研究的目的是了解工艺参数之间的相互作用，形成的微观结构，以及相关的局部材料性能。在技术问题的背景下，必须开发用于制造分级或混合多材料概念或调整所需属性以供DED-LB处理组件的后续热处理使用的策略。在Bergische Universität Wuppertal（BUW）的其他专业领域也对使用该系统有很高的兴趣，涉及产品质量，生成拓扑优化组件结构的可能性以及功能材料及其特性的处理。在BUW，适当的实验室设备可用于工艺适应材料的开发。在这方面，应该提到粉末雾化系统和必要的测量和分析技术，用于粉末材料和DED-LB处理的散装样品的表征和分类。因此，DED-LB系统是对现有实验室设备的有益补充，并将使材料开发变得灵活和快速。对于所描述的可能的研究应用范围，应用了最先进的系统，其具有用于处理Cu和Al基材料的输出为1.8kW的蓝色二极管激光器和用于更经济地处理钢的功率为4kW的近红外二极管激光器。混合结构的制造和多材料设计应该通过集成四个送粉器来实现。在本申请中使用非接触式扫描系统提供了工具的修复和具有复杂几何形状的基板上的结构的制造。

The research focus of the Chair for New Manufacturing Technologies and Materials lies in the development of new material concepts, considering the relevant manufacturing technologies using computer-aided and experimental methods. In addition to material development for the melting and powder metallurgical processes, particular focus is attributed to the material development for additive manufacturing. The material groups considered include the group of corrosion-resistant steels, carbon-martensitic hardenable tool steels, refractory metals, functional materials, and wear-resistant composite materials. In the future, the chair will focus more on material development for the Laser-Direct Energy Deposition (DED-LB) process. In addition to developing adapted material concepts for the DED-LB process, scientific questions regarding the microstructure formation process during solidification and the alternating heat input have to be answered. The research aim is to understand the interaction between the process parameters, the microstructure formed, and the associated local material properties. In the context of technological issues, strategies for manufacturing graded or hybrid multi-material concepts or adjusting the required properties for use by subsequent heat treatment of DED-LB-processed components have to be developed. There is also a high level of interest in using the system at the Bergische Universität Wuppertal (BUW) by other specialist areas, with questions relating to product quality, the possibility of generating topology-optimized component structures and the processing of functional materials and their properties. At BUW, appropriate laboratory equipment can be used for process-adapted material development. In this context, a powder atomization system and the necessary measurement and analysis technology for the characterization and classification of powder materials and the DED-LB-processed bulk specimens should be mentioned. Thus, the DED-LB system is a useful addition to the existing laboratory equipment and would enable flexible and rapid material development. For the described range of possible research applications, a state-of-the-art system is applied, which has a blue diode laser with an output of 1.8 kW for processing Cu and Al base materials and a near-infrared Diode laser with a power of 4 kW for the more economical processing of steel. The manufacture of hybrid structures and a multi-material design should be made possible by integrating four powder feeders. The repair of tools and the manufacturing of structures on substrates with complex geometric shapes are provided in this application using a non-contact scanning system.