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Das Versuchsfeld des LUF Show image information
Temperaturüberwachung der Ölhydraulik einer Umformpresse Show image information
Thermomechanische Behandlung einer Stahlprobe (Presshärten) Show image information
Reibdrücken: Verschließen eines Rohres Show image information
Werkzeug zum Innendrückwalzen Show image information
Spanende Bearbeitung eines Umformwerkzeuges (Vorlesung Werkzeugtechnologie) Show image information

Das Versuchsfeld des LUF

Temperaturüberwachung der Ölhydraulik einer Umformpresse

Thermomechanische Behandlung einer Stahlprobe (Presshärten)

Reibdrücken: Verschließen eines Rohres

Werkzeug zum Innendrückwalzen

Spanende Bearbeitung eines Umformwerkzeuges (Vorlesung Werkzeugtechnologie)

LUF Staff

Dina Hijazi

 Dina Hijazi

Institut für Leichtbau mit Hybridsystemen (ILH)

Member - Research Student - ILH representative for Forming and Machining Technology

Umformende und Spanende Fertigungstechnik

Research Assistant

+49 5251 60-5466
+49 5251 60-5342
Pohlweg 53
33098 Paderborn

Open list in Research Information System


Al2O3/ZrO2-8Y2O3 and (Cr,Ti)AlSiN tool coatings to influence the temperature and surface quality in friction-spinning processes

W. Tillmann, A. Fehr, D. Stangier, M. Dildrop, W. Homberg, B. Lossen, D. Hijazi, Production Engineering (2019), pp. 449-457

Friction-spinning is an incremental forming process, which is accompanied by complex thermal and mechanical loads in the tool and the formed part. To influence the process temperature, two main process parameters, i.e. the rotation speed and the feed rate, can be adapted. With the objective to improve the tool performance and the quality of the workpiece, this study focuses on a coating concept for friction-spinning tools made of high speed steel (HS6 5 2C, 1.3343). On the one hand, atmospheric plasma sprayed (APS) Al2O3 and ZrO2-8Y2O3 coatings serve as a thermal insulator, and, on the other hand, physically vapor deposited (PVD) TiAlSi7.9N and CrAlSi7.5N films are applied to increase the hardness and wear resistance of the tools. In addition, duplex coatings, combining the APS and PVD technique, are synthesized to influence both the heat transfer and the tribological properties of friction-spinning tools. Subsequently, all coated tools are tested in a friction-spinning process to form flanges made of AW-6060 (AlMgSi 3.3206) tube materials. The tool temperatures are determined in-situ to investigate the impact of the tool coating on the process temperature. Compared to an uncoated tool, the alumina and zirconia coatings contribute to a reduction of the tool temperature by up to half, while the PVD films increase the hardness of the tool by 20 GPa. Furthermore, it is shown that the surface quality of thermally sprayed (TS) or PVD coated tools is directly related to the surface roughness of the resulting workpiece.

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