International objectives towards improved resource and energy efficiency require new manufacturing processes, such as the proposed thermomechanical tangential profiled ring rolling process. A rapid cooling-down for microstructural adjustment and a final calibration step via cold forming are combined into one single step. The reduction of process steps and the reduced number of heating cycles present opportunities for improved energy efficiency compared to traditional processes. Based on a series of experiments, this paper aims at showing the potential of this new process in terms of obtainable hardness and microstructure. The influence of the active cooling system and the rolling feed is demonstrated. They are identified as essential with regard to both the geometry and the microstructural properties of the produced part. Finally, the repeatability of the process is analyzed, and potential disturbances are identified and ranked.
Non-destructive testing methods enable not only quality assurance but also material characterization. This is often done in offline application or as an intermediate step, in-line applications in close integration with manufacturing processes are more complex. By using a model integrated into a soft sensor on top of eddy current impedance measurement, we show that it is possible to obtain useful material data using comparatively simple sensor hardware in real time.
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