PSI - Issue 42

Yahar Sarafraz et al. / Procedia Structural Integrity 42 (2022) 125–132 Author name / Structural Integrity Procedia 00 (2019) 000 – 000

132

8

0.1 mm increased the inner volume of the friction drilled bore, which led to an incomplete deformation of the thread profiles and decreased static and cyclic strength accordingly. Although the friction drilling with an adaptive speed reduced the oversizing of the created bore compared to the friction drilled bores with a constant speed, measuring the volume of the formed threads into mentioned bores indicated an opposite trend. While the formed M6-threads in friction drilled bores with constant speed showed a better strength by subjecting to a quasi-static load, manufactured threads with an adaptive speed indicated a higher dynamic strength. The CT scan of the fractured thread indicated a thread stripping for the manufactured thread with constant friction drill speed. A reproducibility was observed in the measured change in potential and deformation-induced temperature during fatigue tests, which can be affected by contact surface and deformation of the thread profiles. Acknowledgments The authors thank the German Research Foundation (Deutsche Forschungsgemeinschaft, DFG) for its financial support within the research project “ Holistic development and characterization of an efficient manufacturing of detachable joints for aluminum and magnesium lightweight materials ” (No. 258976435). Further thanks to the Institute of Machining Technology of the TU Dortmund University (ISF, Germany) for the excellent scientific cooperation. Dehghan, S., Ismail, M.I.S., Ariffin , M.K.A. and Baharudin, B.T.H.T. (2019), “Measurement and analysis of thrust force and torque in friction drilling of difficult-to- machine materials”, The International Journal of Advanced Manufacturing Technology , Vol. 105 7-8, pp. 2749 – 2769. Felinks, N., Overberg, T., Sarafraz, Y., Walther, F. and Biermann, D. (2021a), “Adapted process strategies in front face flow drilling and thread forming of lightweight casting materials ”, Procedia CIRP , Vol. 103, pp. 213 – 218. Felinks, N., Sarafraz, Y., Saelzer, J., W alther, F. and Biermann, D. (2021b), “Influence of temperature in front face flow drilling and thread forming of lightweight cast alloys ”, Procedia CIRP , Vol. 104, pp. 780 – 785. Fernández Landeta, J., Fernández Valdivielso, A., López de Lacalle, L.N., Girot, F. and Pérez Pérez, J.M. (2015), “Wear of form taps in threading of steel cold forged parts ”, Journal of Manufacturing Science and Engineering , Vol. 137 No. 3. Fromentin, G., Poulachon, G., Moisan, A., Julien, B. and Giessler, J. (2005), “Precision and surface integrity of threads obtained by form tapping”, CIRP Annals , Vol. 54 No. 1, pp. 519 – 522. Heiler, R. (2018), “Cold thread forming – the chipless alternative for high resis tant internal threads”, MATEC Web of Conferences , Vol. 251, p. 2046. J.A. Geffen (1976), Piercing tools , US patent 3939683A. Miller, S.F., Blau, P.J. and Shih, A.J. (2005), “Microstructural alterations associated with friction drilling of steel, aluminum, and titanium ”, Journal of Materials Engineering and Performance , Vol. 14 No. 5, pp. 647 – 653. Sarafraz, Y., Koch, A., Felinks, N., Biermann, D. and Walther, F. (2021), “Influence of pre -drilling on hardness and tensile failure of formed internal threads in thin- walled AZ91 cast alloys”, Engineering Failure Analysis , Vol. 130, p. 105783. Timo, E., Dirk, B. and Andreas, Z. (2010), “Internal thread for thin -walled sections: The 12th International Conference on Aluminium Alloys”, Pacifico, Yokohama, Japan Proceedings , pp. 601 – 606. Wittke, P. (2019), Charakterisierung spanlos gefertigter Innengewinde in Aluminium- und Magnesium-Leichtbauwerkstoffen , Dissertation, Werkstofftechnische Berichte , Band 4, Springer Fachmedien Wiesbaden, ISBN 978-3-658-27942-4, https://doi.org/10.1007/978-3-658-27943-1. Wittke, P., Teschke, M. and Walther, F. (2018), “Mechanical characterization of friction drilled internal threads in AZ91 profiles”, The International Journal of Advanced Manufacturing Technology , Vol. 99 9-12, pp. 3111 – 3122. References Biermann, D. and Liu, Y. (2014), “Innovative flow drilling on magnesium wrought alloy AZ31”, Procedia CIRP , Vol. 18, pp. 209 – 214.