Improvement of product properties by selective induction of residual stresses in incremental sheet metal forming

• Applicants: Professor Dr.-Ing. Thomas Lampke; Professor Dr.-Ing. A. Erman Tekkaya
• Subject Area: Primary Shaping and Reshaping Technology, Additive Manufacturing ; Mechanical Properties of Metallic Materials and their Microstructural Origins
• Term: since 2017
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 372803376

The incremental sheet metal forming (ISF) process is suitable to manufacture components in small batch sizes according to specific requirements. The component properties are particularly determined by the residual stresses in the component. The aim of the research project is to improve the component properties through forming-induced residual stresses. The potential of influencing the residual stresses in a specific way through the forming process was proven in the previous funding period. It was shown that the process parameters of ISF directly influence the deformation mechanisms bending, shearing and normal stress component, which effects the residual stress state. In the second funding period the achievable improvement of the component properties by forming induced residual stresses was analyzed. Process enhancements enable an induction of higher residual stresses or an inversion of compressive to tensile residual stresses. The third funding period is focused on the prediction of the component property improvements and the residual stress stability under continuous operation in a corrosive environment. The generated knowledge will support the planning and manufacturing of components with specific requirements.

• DFG Programme: Priority Programmes
• Subproject of: SPP 2013: The utilization of residual stresses induced by metal forming
• Co-Investigators: Professor Dr.-Ing. Till Clausmeyer; Dr.-Ing. Thomas Grund