Kurzfassung
Der vorliegende Beitrag befasst sich mit der spanenden Bearbeitung von kohlenstofffaserverstärkten Kunststoffen (CFK) mittels Kreissä-gewerkzeugen. Durch experimentelle Untersuchungen werden die Auswirkungen von Prozess- und Werkzeugparametern auf die Bearbeitungsqualität aufgezeigt.
Das Ziel dieser Arbeit ist es, die Trocken- und Nasszerspanung von CFK zu verbessern. Für die Trockenzerspanung liegt der Schwerpunkt auf der Entwicklung eines Spannfutters mit integrierter Absaugung. Dadurch soll ein höherer CFK-Partikelerfassungsgrad erreicht werden, der weitere Absaugsysteme und eine lange Belüftungszeit des Maschinenarbeitsraumes unnötig macht. Bei der Nasszerspanung wird der Einfluss von Kühlschmierstoff auf den Werkzeugverschleiß, die Bearbeitungsqualität und die Klebefestigkeit von CFK analysiert.
The objective of this work is to improve dry and wet machining of CFRP. For dry machining the focus lies on the development of a collet chuck exhaust system. This should achieve a higher CFRP-particle collection efficiency which renders further exhaust systems and additional exhaust times unnecessary. For wet machining, the objective is to analyze the influence of cooling lubricant on the tool wear, the machined quality and the bonding strength of CFRP.
In the context of high tool wear concerning machining of carbon fiber reinforced plastic (CFRP), it is desirable to study new processes and techniques which are able to lower the wear and thus induced costs. Therefore, this article presents a novel minimum quantity dry lubrication (MQDL)-process. It delivers minimal amounts of graphite powder, using compressed air as a conveying medium to its operating area between the tool and workpiece. For this purpose a prototypical fluidisation device for conditioning, dosing and conveying the graphite powder was built. The investigations have shown that the constructed prototype is already able to deliver tiniest amounts of graphite mass flows (less than 3 g/h) reliably. Furthermore, first results of drilling tests with internal MQDL-supply are presented. The cutting edge radius of the solid carbide drilling tools has been chosen as the wear measuring quantity. With the use of MQDL at drilling CFRP, a clear reduction in wear is shown, in comparison to pure compressed air. Finally the article shows further research and application areas of this new MQDL-technology.
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