In milling, burrs are formed on entry and exit edges of the workpiece to be machined like in all material removal processes. In the subsequent production these burrs have to be removed. Understanding the influencing factors and burr formation mechanisms can help to avoid or reduce burrs. Another possibility for saving costs is to reduce the process materials, for example, cutting fluids. This can be realised by using minimum quantity lubrication or dry machining. The investigations show which influence both methods have on burr formation.
Machining with minimum quantity lubrication (MQL) is state of the art. Previous investigations were, however, concerned with tool optimisation and the surface quality of workpieces as well as coating technology. By now the same or partly better machining results than in conventional cutting with flood lubrication can be achieved due to adjusted tool geometries, workpiece materials and coatings. Tests about burr formation in short hole drilling exist for dry cutting or the machining with emulsion. This paper expands these results to the burr formation in machining with MQL.
Kurzfassung
Bei der Bearbeitung mit Minimalmengenschmierung muss beachtet werden, dass sie in ihrer Effizienz insbesondere von der Art der Zuführung des Mediums zum Werkzeug abhängt. Ferner wird dieses auf dem Weg von der Erzeugung bis zur Wirkstelle durch die Strömungsverhältnisse beeinflusst. In diesem Artikel werden Ergebnisse zur Messung der Medienmenge bei asymmetrisch mit Hartmetall-Wendeschneidplatten besetzten Bohrwerkzeugen, so genannten Kurzlochbohrern, vorgestellt. Die Ergebnisse der am Markt befindlichen Bohrer belegen das immer noch vorhandene Potenzial zur Optimierung dieser Werkzeuge.
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