Lehrstuhl für Fertigungstechnologie, Universität Erlangen-Nürnberg

Mechanical joining without auxiliary elements (DFG SFB/TR 285 - C01)

Project Status: Active


Resource-saving manufacturing is a current trend both socially and industrially. Therefore, the aim is to use the right material in the right place for each component in terms of function, durability, production and costs. In particular, semi-finished products made of endless fibre-reinforced plastic composites (EFRPC) have a very high potential for lightweight construction for flexible series production due to their high strength and rigidity combined with low density. In addition, lightweight metallic materials such as high-strength steel and aluminium are also becoming increasingly important due to their lightweight design capabilities.. However, when combining EFRPC with metal as well as joining dissimilar metals to form a multi-material system, the joining technology poses a central challenge. This results in a high demand for new, robust, economical and versatile joining technologies. An efficient approach with enormous potential for hybrid structures is the joining without auxiliary elements through a form- and force-fitting connection by using metallic pins. Such pins can be produced in a short process chain using forming technology. The cylindrical pin structures are manufactured from the sheet metal by full forward extrusion. Subsequently, they are joined by either caulking or direct pin-pressing. The realized connections are analyzed.

The goal of the project, which is being carried out in cooperation with the Institute of Polymer Technology (https://www.lkt.tf.fau.de/), is the basic scientific investigation of the described approach for joining without auxiliary elements. In addition, material and process knowledge for the joining of multi-material systems by using formed pin structures in shortened, versatile process chains is to be established.The project is part of the Collaborative Research Centre (CRC) / Transregio 285, which is funded by the German Research Foundation (DFG) and focuses on the development of methods for mechanical joining in versatile process chains (project number 418701707 - TRR 285).

C01 process ENG

Research Groups



    • Kraus, M.; Merklein, M.:
      Potential of Joining Dissimilar Materials by Cold Formed Pin-Structures.
      Journal of Materials Processing Technology, https://doi.org/10.1016/j.jmatprotec.2020.116697 (2020), published


    • Kraus, M.; Frey, P.; Kleffel, T.; Drummer, D.; Merklein, M.:
      Mechanical Joining Without Auxiliary Element by Cold Formed Pins for Multi-Material-Systems.
      In: AIP Conference Proceedings 2113, 050006 (Edtr.): Proceedings of the 22nd International ESAFORM Conference on Material Forming, DOI: 10.1063/1.5112570, 2019, pp. 1-6

    • Kraus, M.; Merklein, M.:
      Potential of Joining Dissimilar Materials by Cold Formed Pin-Structures.
      In: (Edtr.): 1st International Conference on Advanced Joining Processes 2019, 2019, published on CD

    Letztes Update: 03.02.2020