The dissemination of TFP technology into industrial processes is the top priority.
The dissemination of TFP technology into industrial processes is the top priority. This technology is extremely promising, especially in the age of limited resources and CO2 emissions for production processes: CO2 can be saved in the transport sector by reducing vehicle weight, and the reduction of fibre waste means that there are no waste volumes that need to be recycled at all. In addition, the TFP process will be used specifically for the functionalisation of fibre composite structures. The TFP textiles are to be specifically equipped with metallic inserts and thus be available as a joining technology for fibre composite and metal components.
Introduction & Key Points
The development of a highly automated manufacturing process for fibre composite hybrid
components should allow the production of functionalised reinforcement textiles using TFP.
> Increasing demand for detachable joining technologies, in particular in the automotive industry
> The design of hybrid components is increasing and is to be made easier. For this purpose, metallic inserts are suitable as joining technology for fibre composite and metal parts.
> Adhesive and mechanical joining technologies are currently used for this purpose.
> The limiting factors are bonding surfaces and bonding strengths.
> Increased tool wear when drilling FRP components
Quelle: https://www.audi-mediacenter.com/de/fotos/detail/audi-r8-21589 | Verbindungstechniken in der Karosserie | Bild-Nr: A155355 | Copyright: AUDI AG
and carbon fibre reinforced plastics (CFRP). The CFRPs are characterized by the absorption of high forces and stresses that occur in the car body and can contribute to a lower vehicle weight and centre of gravity due to the low component density. One of the major challenges is the (detachable)
joining of the fibre composite and metal components.
Vision & Idea
Design & Draft
Fibre paths are designed according to the load and CAD drawings are created for the preform and tool.
SKETCH FIBER FLOW
LOAD CONDITION SPIDER PART
LOAD CONDITION SPIDER PART
Machine programming for the TFP process requires an in-depth knowledge of the material with a high productivity in mind.
Preforming TFP Manufacturing
Machine programming for the TFP process requires an in-depth knowledge of the material with a high productivity in mind. The inserts in the TFP process are placed with an accuracy of a tenth of a millimetre.
Due to the near-net-shape placement of the fibre structures in the TFP process, tools for resin infusion must be manufactured precisely. This results in very light, high-performance composite components.
The bonding strength can be examined by means of mechanical test methods, e.g. with an insert pull-out test in a test laboratory.
Active double-wire fibre supply units
Active double-wire carbon supply units
ZSK a lifetime
Pneumatic clamping frame
Scope & approach
> Automated TFP process for the functionalised TFP preforms – in a single process step.
> High-precision fixation of metallic inserts into TFP semi-finished products
> The use of Tailored Fibre Placement (TFP) is justified by tailor-made, near-net-shape preforms and the reduction of fibre waste to less than 5
> The „InsertApplicator“ can be mounted directly on the TFP machine and enables the automated depositing of metallic inserts and precise fixing of the inserts during TFP preforming
The embedding of the inserts in the preform and the simultaneous hole reinforcement in the TFP process enables maximum optimisation of mechanical performance
Results & application
> Fully automatic integration process of inserts into the TFP process.
> The pull-out strength due of the TFPInsert approach can increase by 20 to 40%.
> Process time is reduced when integrating inserts
- minimisation of the necessary process steps
- minimisation of the total time from 200 s to only 16 s
> Bicycle brake disc as demonstrator component
- No fibre waste is generated during production
- fibre layers are compacted by the TFP process
- Composite part and wheel hub can be joined detachably
Composite integrated insert
TFP composite part
IS2000 6-hole connectors
Involved, Contact & Literature
Institut für Textiltechnik (ITA) der RWTH Aachen University
Otto-Blumenthal-Straße 1, 52074 Aachen, Germany
Telefon: +49 241 80-23400
Fax: +49 241 80-22422
Hollmann GmbH, Cologne, Germany
Poller Kirchweg 78-90, 51105 Köln, Germany
Telefon: +49 221 422 93 93
 Leichtbau BW GmbH, Fraunhofer ISI: Wertschöpfungspotenziale im Leichtbau und  Lauter, C.; Tröster, T.; Sköck-Hartmann, B.; Gries, T.; Linke, M.: Höchstfeste  Schwab, M., Oppitz, S., Biche, W.: Anbindung von Inserts in Faserverbundkunststoffbauteile.
deren Bedeutung für Baden-Württemberg, 2014.
Multimaterialsysteme aus Stahl und Faserverbundkunststoffen, Konstruktion 11-12, p.
ATZ Prod. 7, p. 58-63 (2020)
 Leichtbau BW GmbH, Fraunhofer ISI: Wertschöpfungspotenziale im Leichtbau und
 Lauter, C.; Tröster, T.; Sköck-Hartmann, B.; Gries, T.; Linke, M.: Höchstfeste
 Schwab, M., Oppitz, S., Biche, W.: Anbindung von Inserts in Faserverbundkunststoffbauteile.
Acknowledgement We would like to thank the Federal Ministry of Economic Affairs and Energy (BMWi) for the financial support of the research project „TFPInsert“ within the framework of the Central Innovation Programme for SMEs (ZIM).