@book{36412, author = {{Kersting, Lukas and Trächtler, Ansgar and Arian, Bahman and Homberg, Werner and Rozo Vasquez, Julian and Walther, Frank}}, isbn = {{978-3-948749-23-1 }}, publisher = {{Diedrich}}, title = {{{Echtzeitfähige Modellierung eines innovativen Drückwalzprozesses für die eigenschaftsgeregelte Herstellung gradierter Bauteile.}}}, year = {{2022}}, } @article{23469, abstract = {{The implementation of control systems in metal forming processes improves product quality and productivity. By controlling workpiece properties during the process, beneficial effects caused by forming can be exploited and integrated in the product design. The overall goal of this investigation is to produce tailored tubular parts with a defined locally graded microstructure by means of reverse flow forming. For this purpose, the proposed system aims to control both the desired geometry of the workpiece and additionally the formation of strain-induced α′-martensite content in the metastable austenitic stainless steel AISI 304 L. The paper introduces an overall control scheme, a geometry model for describing the process and changes in the dimensions of the workpiece, as well as a material model for the process-induced formation of martensite, providing equations based on empirical data. Moreover, measurement systems providing a closed feedback loop are presented, including a novel softsensor for in-situ measurements of the martensite content.}}, author = {{Riepold, Markus and Arian, Bahman and Vasquez, Julian Rozo and Homberg, Werner and Walther, Frank and Trächtler, Ansgar}}, issn = {{2666-9129}}, journal = {{Advances in Industrial and Manufacturing Engineering}}, title = {{{Model approaches for closed-loop property control for flow forming}}}, doi = {{10.1016/j.aime.2021.100057}}, year = {{2021}}, } @inproceedings{21477, author = {{Rostek, Tim and Makeieva, Hanna and Homberg, Werner}}, booktitle = {{Proceedings of the 13th International Conference on the Technology of Plasticity}}, editor = {{Daehn, G. and Cao, J. and Kinsey, B. and Tekkaya, A. E. and Vivek, A. and Yoshida, Y}}, isbn = {{978-3-030-75380-1}}, location = {{Columbus}}, pages = {{2115--2125}}, publisher = {{Springer, Cham}}, title = {{{Cutting Blades for Food Processing Applications Manufactured Using Innovative Spin Forming}}}, doi = {{10.1007/978-3-030-75381-8_178}}, year = {{2021}}, } @inbook{22766, author = {{Dahms, Frederik and Homberg, Werner}}, booktitle = {{Forming the Future}}, issn = {{2367-1181}}, location = {{Ohio, USA, VIRTUAL EVENT}}, pages = {{2249--2259}}, publisher = {{Springer, Cham}}, title = {{{Investigations and Improvements in 3D-DIC Optical Residual Stress Analysis—A New Temperature Compensation Method}}}, doi = {{10.1007/978-3-030-75381-8_189}}, year = {{2021}}, } @inproceedings{30297, author = {{Rozo Vasquez, Julian and Arian, Bahman and Riepold, Markus and Walther, Frank and Homberg, Werner and Trächtler, Ansgar}}, booktitle = {{Proceedings of the 11th International Work­shop NDT in Progress}}, location = {{Prague}}, title = {{{Magnetic Barkhausen noise analysis for microstructural effects separation during flow forming of metastable austenite 304L.}}}, year = {{2021}}, } @inproceedings{23465, abstract = {{One of the main objectives of production engineering is to reproducibly manufacture (complex) defect-free parts. To achieve this, it is necessary to employ an appropriate process or tool design. While this will generally prove successful, it cannot, however, offset stochastic defects with local variations in material properties. Closed-loop process control represents a promising approach for a solution in this context. The state of the art involves using this approach to control geometric parameters such as a length. So far, no research or applications have been conducted with closed-loop control for microstructure and product properties. In the project on which this paper is based, the local martensite content of parts is to be adjusted in a highly precise and reproducible manner. The forming process employed is a special, property-controlled flow-forming process. A model-based controller is thus to generate corresponding correction values for the tool-path geometry and tool-path velocity on the basis of online martensite content measurements. For the controller model, it is planned to use a special process or microstructure (correlation) model. The planned paper not only describes the experimental setup but also presents results of initial experimental investigations for subsequent use in the closed-loop control of α’-martensite content during flow-forming.}}, author = {{Arian, Bahman and Homberg, Werner and Riepold, Markus and Trächtler, Ansgar and Rozo Vasquez, Julian and Walther, Frank}}, isbn = {{978-2-87019-302-0}}, keywords = {{Flow-forming, Spinning, Process Strategy, Martensite Content, Property Control, Micromagnetic Measurement, Metastable Austenitic Stainless Steel}}, location = {{Liège, Belgium}}, publisher = {{ULiège Library}}, title = {{{Forming of metastable austenitic stainless steel tubes with axially graded martensite content by flow-forming}}}, year = {{2021}}, } @inbook{30296, author = {{Wiens, Eugen and Homberg, Werner and Arian, Bahman and Möhring, Kerstin and Walther, Frank}}, booktitle = {{Forming the Future}}, isbn = {{9783030753801}}, issn = {{2367-1181}}, location = {{Virtual Event}}, publisher = {{Springer International Publishing}}, title = {{{Forming of Parts with Locally Defined Mechanical and Ferromagnetic Properties by Flow-Forming}}}, doi = {{10.1007/978-3-030-75381-8_160}}, year = {{2021}}, } @article{26082, author = {{Wischer, Christian and Wiens, Eugen and Homberg, Werner}}, issn = {{2666-3309}}, journal = {{Journal of Advanced Joining Processes}}, publisher = {{Elsevier}}, title = {{{Joining with versatile joining elements formed by friction spinning}}}, doi = {{10.1016/j.jajp.2021.100060}}, volume = {{3}}, year = {{2021}}, } @proceedings{22453, editor = {{Wiens, Eugen and Wischer, Christian and Homberg, Werner}}, title = {{{Development of a novel adaptive joining technology employing Friction-Spun Joint Connectors (FSJC)}}}, doi = {{10.25518/esaform21.4682}}, year = {{2021}}, } @inproceedings{22965, author = {{Rozo Vasquez, Julian and Arian, Bahman and Riepold, Markus and Homberg, Werner and Trächtler, Ansgar and Walther, Frank}}, booktitle = {{ 54. Metallographie-Tagung}}, pages = {{75--81}}, title = {{{Microstructural investigation on phase transformation during flow forming of the metastable austenite AISI 304 }}}, year = {{2020}}, } @article{30713, author = {{Rostek, Tim and Wiens, Eugen and Homberg, Werner}}, journal = {{Procedia Manufacturing}}, pages = {{395--399}}, publisher = {{ Elsevier Ltd}}, title = {{{Joining with Versatile Friction-Spun Joint Connectors}}}, doi = {{10.1016/j.promfg.2020.04.313}}, volume = {{47}}, year = {{2020}}, } @inproceedings{21447, abstract = {{Even though the spectrum of parts is expected to shift over the long term as a result of increasing e-mobility, there is still an extremely high demand for complex components made of high-strength materials which can only be produced by hydroforming technologies. The innovative combination of hydroforming processes with other forming processes, as well as the improvement of the processes themselves, offers considerable potential for improvement. A number of promising ways of improving the hydroforming process chain are therefore the subject of this contribution. The focus of the article is on possible approaches for combining (incremental) pre- and post-forming operations, which can permit considerable improvements in both quality and features at a reduced cost. Furthermore, a novel combination of quasi-static and high-speed forming processes is presented, leading to an improved overall forming process (with a high application potential) for the production of complex parts. }}, author = {{Wiens, Eugen and Djakow, Eugen and Homberg, Werner}}, booktitle = {{Nebu/Nehy 2020}}, keywords = {{Hydroforming, Incremental Forming, Internal Flow-turning, High-speed Forming}}, title = {{{Some ideas for the further development of hydroforming process chains}}}, year = {{2020}}, } @inproceedings{21451, author = {{Rostek, Tim and Homberg, Werner}}, booktitle = {{AIP Conference Proceedings 2113, 170018}}, number = {{1}}, publisher = {{AIP Publishing}}, title = {{{Improved set up strategies for steel strip straightening machines}}}, doi = {{10.1063/1.5112734}}, volume = {{2113}}, year = {{2019}}, } @inproceedings{15068, author = {{Wiens, Eugen and Homberg, Werner}}, booktitle = {{PROCEEDINGS OF THE 22ND INTERNATIONAL ESAFORM CONFERENCE ON MATERIAL FORMING: ESAFORM 2019}}, title = {{{Forming analysis of tailored tubes with an internal contoured wall thickness and external axial ribs manufactured by internal flow-turning}}}, doi = {{10.1063/1.5112535}}, year = {{2019}}, } @inproceedings{21457, abstract = {{This paper presents the finite element model developed for the simulation of pipe elbow production by the so-called ‘Hamburg process’ in order to improve productivity and resource efficiency. To optimize the tooling design, a sensitivity analysis of the tool parameters that influence the quality of pipe elbows, such as mandrel height and length, is conducted. Different materials data sets including damage models were considered. Using numerical simulations, it is possible to determine an optimized tool geometry for the production of specific pipe elbow dimensions. Furthermore, as a result of the experiments and numerical simulations conducted, it is possible to increase the production velocity of the serial plant. Along with deformation, damage models are included in simulations in order to identify the right process boundaries. Finally, an experimentally validated model is developed for increasing resource efficiency in pipe elbow fabrication.}}, author = {{Diekmann, Uwe and Homberg, Werner and Prehm, Jens and Rostek, Tim and Schönhoff, Nils and Tabakajew, Dmitri and Trasca, Andreea and Uysal, Haris}}, booktitle = {{Materials Science Forum}}, issn = {{1662-9752}}, pages = {{159--164}}, publisher = {{Trans Tech Publications Ltd}}, title = {{{Optimization of Tooling Design for Hot Mandrel Bending of Pipe Elbows}}}, doi = {{10.4028/www.scientific.net/msf.918.159}}, volume = {{918}}, year = {{2018}}, } @inproceedings{21458, author = {{Rostek, Tim and Homberg, Werner}}, booktitle = {{AIP Conference Proceedings 1960, 100013}}, number = {{1}}, publisher = {{AIP Publishing}}, title = {{{Grading Technologies for the Tanufacture of Innovative Cutting Blades}}}, doi = {{10.1063/1.5034953}}, volume = {{1960}}, year = {{2018}}, } @inproceedings{21465, author = {{Homberg, Werner and Rostek, Tim and Schaper, Mirko and Grydin, Olexandr and Andreiev, Anatolii and Brosius, Alexander and Guilleaume, Christina}}, issn = {{2366-4061}}, pages = {{28--33}}, publisher = {{Universität Paderborn}}, title = {{{Hybride Verbundstrukturen aus Aluminium und Titan für Leichtbauanwendungen}}}, year = {{2018}}, } @techreport{30257, author = {{Wiens, Eugen and Homberg, Werner}}, isbn = {{978-3-946885-25-2}}, title = {{{Herstellung innovativer Stahlhalbzeuge mit wanddicke- und festigkeitsveränderlichen Eigenschaften für den Leichtbau durch Innendrückwalzen (IDW)}}}, volume = {{P 948}}, year = {{2018}}, } @article{15067, author = {{Wiens, Eugen and Homberg, Werner}}, issn = {{2261-236X}}, journal = {{MATEC Web of Conferences}}, location = {{Bremen}}, title = {{{Internal Flow-Turning – extended manufacturing possibilities in tailored tube production}}}, doi = {{10.1051/matecconf/201819011002}}, year = {{2018}}, } @article{21449, author = {{Rostek, Tim and Homberg, Werner}}, issn = {{1877-7058}}, journal = {{Procedia Engineering}}, location = {{Cambridge}}, pages = {{2185--2190}}, publisher = {{Elsevier Ltd}}, title = {{{Locally Graded Steel Materials for Self-Sharpening Cutting Blades}}}, doi = {{10.1016/j.proeng.2017.10.979}}, volume = {{207}}, year = {{2017}}, }