Control of component properties in rotary swaging process

旋压成形是一种成熟的增量式冷成形生产技术。第一次尝试描述材料的修改，如加工硬化和残余应力的产生，以及导致材料流动历史的增量材料流动是已知的。由于相同最终形状的材料流的高度可变性，旋转锻压是一种特别适合的成型工艺，以便通过过程控制产生残余应力。本项目的最终目的是描述由工艺控制控制的材料流、由此产生的材料修改（特别是残余应力状态）和由此产生的部件机械性能之间的相互关系。因此，应该可以根据旋转模压工艺参数或相反的方式来预测机械性能，以定义所需的工艺参数，以实现所需的部件的机械性能。这一目标是基于这样的假设：一方面，机械性能与加工硬化和残余应力产生方面产生的材料改性相关，另一方面，这些材料改性是由工艺的材料流动历史造成的。为实现总体目标，第三个资助期确定了四个子目标：设计和优化多阶段生产的旋转冲压工艺；残余应力的构件自适应调整；在实际使用条件下验证和预测性能改进；整体方法的设计与可移植性。

Rotary swaging is an established incremental cold forming production technique. First attempts to describe the material modifications such as work hardening and residual stress generation as well as the incremental material flow leading to a material flow history are already known. Due to its high variability of the material flow for the same final shape, rotary swaging is a particularly suitable forming process in order to generate residual stresses by process control. The final aim of this project is to describe the interrelation between the material flow, which is controlled by the process control, the resulting material modifications - in particular the residual stress state - and the resulting mechanical properties of the components. As a result, it should be possible to predict the mechanical properties depending on the rotary swaging process parameters or the other way round, to define the required process parameters in order to achieve the desired mechanical properties of the components. This goal is based on the hypothesis that on the one hand, the mechanical properties correlate with the generated material modifications in terms of work hardening and residual stress generation, and on the other hand that these material modifications are resulting from the material flow history of the process. To achieve the overall objective, four sub-objectives are defined for the third funding period: Design and optimization of the rotary swaging process for multi-stage production; component-adapted adjustment of residual stresses; verification and prediction of property improvements under realistic service conditions; design and transferability of the overall method.