MATEC Web Conf.
Volume 190, 20185th International Conference on New Forming Technology (ICNFT 2018)
|Number of page(s)||6|
|Section||Micro cold forming, Special session SFB 747|
|Published online||18 September 2018|
Eccentric rotary swaging variants
Leibniz Institute for Materials Engineering IWT
2 bime Bremen Institute for Mechanical Engineering
3 MAPEX Center for Materials and Processing
1 University of Bremen, Faculty of Production Engineering, 28359 Bremen, Germany
2 University of Bremen, Faculty of Production Engineering, 28359 Bremen, Germany
3 University of Bremen, Faculty of Production Engineering, 28359 Bremen, Germany
Corresponding author : firstname.lastname@example.org
Rotary swaging is an incremental cold forming process that changes beneath the geometry also the microstructure and mechanical properties of workpiece. Especially a new process design with Eccentric Flat Shaped Dies (EFSD) influences both the kind and amount of stress and plastic strain and consequently the material structure and hence the material and workpiece properties. Eccentric rotary swaging typically provides a helical material flow. According to the process parameters the microstructure features a typical eddy pattern with a spiral shaped grain orientation. The forming process can be carried out in one or more process steps. In a multi-stage process, it is possible to change the feed direction and, hence, the material flow helix direction. This approach can be used as a possibility to improve the homogeneity of the workpiece and material properties. In addition, for this aims an intermediate heat treatment in multi-stage forming operations could be realised. Following the goal of optimising the final properties, the question arises how these mechanical and thermal treatments affect the material microstructure and the forming properties of the workpiece and how they interact. Experiments were conducted with austenitic stainless steel rods of grade AISI304. The effects of the varied feed direction, feed velocity and heat treatment between the forming operations are discussed.
Key words: Cold forming / Micro structure / Metal forming
© The Authors, published by EDP Sciences, 2018
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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