naa a22 4500 510823831 CHVBK 20180411083547.0 cr unu---uuuuu 180411e20130801xx s 000 0 eng 10.1007/s12541-013-0200-1 doi (NATIONALLICENCE)springer-10.1007/s12541-013-0200-1 Controlling heat balance in hot aluminum extrusion by additive manufactured extrusion dies with conformal cooling channels [Elektronische Daten] [Ramona Hölker, Andreas Jäger, Nooman Ben Khalifa, A. Tekkaya] To prevent overheating of the workpiece material, an extrusion die with integrated local cooling was designed and manufactured by selective laser melting (SLM) as an additive manufacturing technology. The major advantage of SLM is the geometric freedom of the components that can be manufactured, which has been used to produce a die with integrated multidirectional channels for a cooling medium and the integration of thermocouples for temperature measurement. To analyze the influence of the die cooling on the heat balance in hot extrusion, extrusion trials at different ram speeds and billet preheating temperatures with and without applying die cooling were performed. Compressed air was used as coolant. At lower ram speeds, a significant reduction of the profile's exit temperature in hot aluminum extrusion was achieved without causing an excessive rising of the extrusion force. At higher production speeds, surface defects in the shape of stripes of rough surfaces occurred but could be prevented by applying internal die cooling. Due to focusing of the heat exchange on the area of the die bearings, only a little influence of the cooling on the microstructure can be observed. Korean Society for Precision Engineering and Springer-Verlag Berlin Heidelberg, 2013 Additive manufacturing nationallicence Rapid tooling nationallicence Conformal cooling nationallicence Hot aluminum extrusion nationallicence HRC : Rockwell hardness nationallicence Ra : surface roughness nationallicence T die : die temperature nationallicence T extr. : exit temperature extrudate nationallicence TC : thermocouple nationallicence v ex : profile exit speed nationallicence Hölker Ramona Institute of Forming Technology and Lightweight Construction (IUL), Technische Universität Dortmund, Baroper Straße 301, 44227, Dortmund, Germany aut Jäger Andreas Institute of Forming Technology and Lightweight Construction (IUL), Technische Universität Dortmund, Baroper Straße 301, 44227, Dortmund, Germany aut Ben Khalifa Nooman Institute of Forming Technology and Lightweight Construction (IUL), Technische Universität Dortmund, Baroper Straße 301, 44227, Dortmund, Germany aut Tekkaya A. Institute of Forming Technology and Lightweight Construction (IUL), Technische Universität Dortmund, Baroper Straße 301, 44227, Dortmund, Germany aut International Journal of Precision Engineering and Manufacturing Springer Berlin Heidelberg 14/8(2013-08-01), 1487-1493 2234-7593 14:8<1487 2013 14 12541 https://doi.org/10.1007/s12541-013-0200-1 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s12541-013-0200-1 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Hölker Ramona Institute of Forming Technology and Lightweight Construction (IUL), Technische Universität Dortmund, Baroper Straße 301, 44227, Dortmund, Germany aut NATIONALLICENCE 700 1- Jäger Andreas Institute of Forming Technology and Lightweight Construction (IUL), Technische Universität Dortmund, Baroper Straße 301, 44227, Dortmund, Germany aut NATIONALLICENCE 700 1- Ben Khalifa Nooman Institute of Forming Technology and Lightweight Construction (IUL), Technische Universität Dortmund, Baroper Straße 301, 44227, Dortmund, Germany aut NATIONALLICENCE 700 1- Tekkaya A. Institute of Forming Technology and Lightweight Construction (IUL), Technische Universität Dortmund, Baroper Straße 301, 44227, Dortmund, Germany aut NATIONALLICENCE 773 0- International Journal of Precision Engineering and Manufacturing Springer Berlin Heidelberg 14/8(2013-08-01), 1487-1493 2234-7593 14:8<1487 2013 14 12541 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer