Sie haben Javascript deaktiviert!
Sie haben versucht eine Funktion zu nutzen, die nur mit Javascript möglich ist. Um sämtliche Funktionalitäten unserer Internetseite zu nutzen, aktivieren Sie bitte Javascript in Ihrem Browser.

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

Thomas Borgert

 Thomas Borgert

Transregional Collaborative Research Centre 285

Research Associate - Teilprojekt C03

Umformende und Spanende Fertigungstechnik

Research Associate

Institute for Lightweight Design with Hybrid Systems

Collegiate - PhD student at the Research College "Leicht - Effizient - Mobil"

+49 5251 60-3168
Pohlweg 53
33098 Paderborn

Open list in Research Information System


Analysis of temperature effect on strength and microstructure in friction induced recycling process (FIRP)

T. Borgert, W. Homberg, in: Materials Research Proceedings, Materials Research Forum LLC, 2023

<jats:p>Abstract. In order to reduce global energy consumption in production and industry along with the associated CO2 emissions, existing resources must be used more efficiently. This includes the energy-efficient and comprehensive recycling of a wide range of metals. Especially for the production of aluminium, there is a large potential for saving energy using efficient recycling processes. With regard to the recycling of aluminium studies have shown that solid-state recycling processes are significantly more efficient considering the used energy and resources compared to the conventional, smelting-metallurgical recycling process. In this paper, the direct and energy-efficient friction-induced recycling process (FIRP) based on the conform process is further described and analysed in terms of the temperature-property relationships. For this purpose, the influence of the processing temperature on the microstructure and properties of the recycled semi-finished products is investigated using the toll system that enables an ECAP forming. Specific sections of the (in theory) infinite, recycled semi-finished product are taken and analysed at different process temperatures of the solid state recycling process. Based on these sections, the properties in terms of mechanical hardness, strength, ductility and grain size are analysed and a degressive relationship between process temperature and mechanical hardness up to a temperature of 270 °C can be shown. Applying the Hall-Petch relationship, it is analysed whether there is a correlation between the strength and the microstructure in the form of the grain size. </jats:p>

Influence of thermo-mechanical joining process on the microstructure of a hypoeutectic aluminium cast alloy

T. Borgert, M. Neuser, E. Wiens, O. Grydin, W. Homberg, M. Schaper, in: Materials Research Proceedings, Materials Research Forum LLC, 2023, pp. 187-194

<jats:p>Abstract. Requirements of multi-material construction involve adjustments to standard joining techniques. Especially the growing importance of integral cast components poses additional engineering challenges for the industry. One approach to achieve these goals are adaptable joining elements formed by friction spinning. This approach uses friction-induced heat to form customisable joining elements to join sheets for different boundary conditions, even for brittle cast materials. It is possible to react immediately to adapt to the joining process inline and reduce the amount of different joining elements. As the joining partner serve casting plates of the aluminium casting alloy EN AC–AlSi9, which is processed in the sand casting. Joining hypoeutectic AlSi alloys constitutes a challenge because the brittle character of these cause cracks in the joint during conventional mechanical joining. Furthermore, the friction-induced heat of the novel joining process causes a finer microstructure in the hypoeutectic AlSi9 casting alloy. In particular, the eutectic Si is more fine-grained, resulting in higher joint ductility. This study indicates the joining suitability of a hypoeutectic aluminium casting alloy in combination with adaptive manufactured additional joining elements. Here, various mechanical and microstructural investigations validate the influence of the thermomechanical joining technique. In conclusion, the potential of this joining process is presented regarding the joinability of cast aluminium components. </jats:p>


Assessment of mechanical and optical properties of Al 6060 alloy particles by removal of contaminants

P. Vieth, T. Borgert, W. Homberg, G. Grundmeier, Advanced Engineering Materials (2022)


Energy saving potentials of an efficient recycling process of different aluminum rejects

T. Borgert, W. Homberg, Energy Reports (2022), 8, pp. 399-404



Friction-Induced Recycling Process for User-Specific Semi-Finished Product Production

T. Borgert, W. Homberg, Metals (2021), 663

<jats:p>Modern forming processes often allow today the efficient production of complex parts. In order to increase the sustainability of forming processes it would be favorable if the forming of workpieces becomes possible using production waste. At the Chair of Forming and Machining Technology of the Paderborn University (LUF) research is presently conducted with the overall goal to produce workpieces directly from secondary aluminum (e.g., powder and chips). Therefore, friction-based forming processes like friction spinning (or cognate processes) are used due to their high efficiency. As a pre-step, the production of semi-finished parts was the subject of accorded research work at the LUF. Therefore, a friction-based hot extrusion process was used for the full recycling or rework of aluminum chips into profiles. Investigations of the recycled semi-finished products show that they are comparable to conventionally produced semi-finished products in terms of dimensional stability and shape accuracy. An analysis of the mechanical properties of hardness and tensile strength shows that a final product with good and homogeneously distributed properties can be produced. Furthermore, significant correlations to the friction spinning process could be found that are useful for the above-mentioned direct part production from secondary aluminum.</jats:p>

Open list in Research Information System

The University for the Information Society