Process Stability and Reproducibility of the Dieless Drawing Process for AZ31 Magnesium Wires

Research output: Contributions to collected editions/worksArticle in conference proceedingsResearchpeer-review


Magnesium (Mg)-based wires are in the focus of interest for numerous applications like micro-forming technologies or medical engineering. Manufacturing thin Mg-based wires is widely realized by applying a conventional multiple pass cold wire drawing process. This requires a complex manufacturing schedule of multiple passes with intermediate heat treatments to overcome work hardening, because of the cold forming process. Especially Mg and its alloys are known for their rather low formability at room temperature associated with the hexagonal close-packed lattice structure. The dieless drawing process uses local heating to initialize a localized plastic zone under an external tensile load to achieve higher reductions in diameter in a single wire drawing pass. It can therefore present a solution for a more efficient warm manufacturing process of Mg-based wires. In this study, the stability of the steady state material flow during a dieless wire drawing process and its reproducibility was investigated. For this purpose, a variation of process parameters was selected and wire manufacturing was carried out using magnesium alloy AZ31. A single and double dieless drawing process was applied. Additionally, a conventional cold wire drawing process including a die with the same forming schedule was executed as a benchmark experiment. The results of this study show, that the dieless drawing process is not only a stable process after reaching the steady state, but it is also a reproducible and accurately adjustable process. Moreover, the dieless drawing process maintains the property profile of the starting material to a large extend.

Original languageEnglish
Title of host publicationAchievements and Trends in Material Forming : Peer-reviewed extended papers selected from the 25 th International Conference on Material Forming (ESAFORM 2022)
EditorsGabriela Vincze, Frédéric Barlat
Number of pages12
Place of PublicationBaech
PublisherTrans Tech Publications Ltd
Publication date2022
ISBN (print)978-3-0357-1759-4
ISBN (electronic)978-3-0357-3750-9
Publication statusPublished - 2022
EventConference - 25th International Conference on Material Forming, ESAFORM 2022 - Altice Forum Braga, Braga, Portugal
Duration: 27.04.202229.04.2022
Conference number: 25

Bibliographical note

Funding Information:
The authors would like to thank Mrs. Maria Nienaber for her help with the extrusion of the wires and Mr. Chee Hans Ho for his help with carrying out wire drawing experiments and surface measurements. Furthermore, the authors would like to thank Mr. Axel Dieckmann for his valuable comments and his prior work with the design of the experimental setup.

Publisher Copyright:
© 2022 The Author(s). Published by Trans Tech Publications Ltd, Switzerland.

    Research areas

  • cold wire drawing, dieless wire drawing, hot forming, magnesium wire, process stability
  • Engineering