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Effect of cutting environment and heat treatment on the surface roughness of drilled Al/SiC MMC

Published/Copyright: March 29, 2016
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Abstract

In the last decades, the use of metal matrix composites (MMCs) has increased enormously in many engineering applications such as aerospace, automotive, marine and railway. Such materials are known as difficult to machine materials due to the presence of very hard and abrasive reinforcements. The purpose of this study is to determine the influence of the cutting parameters, cutting environment and heat treatments on the surface roughness after drilling A 356/15 SiC MMCs. Experiments were conducted at different cutting speeds, feed rates, heat treatments (as-received, solution annealed and aged) and cutting environments (MQL, compressed air and dry). Improved surface roughness values were obtained with increased cutting speeds and decreased feed rates. The surface roughness using the MQL technique was lower than the surface roughness obtained for the other cutting environment. The optimal machining parameter combination has been obtained and the cutting conditions in terms of the cutting speed of 15 m × min−1, the feed rate of 0.1 mm × rev−1 and the cutting environment MQL represent applicable solutions for the annealed materials.

Kurzfassung

In den letzten Jahrzehnten hat die Verwendung von Metallmatrix-Kompositen (Metal Matrix Composites (MMC)) in vielen technischen Anwendungsfeldern enorm zugenommen, wie zum Beispiel im Flugzeugbau, Automobilbau, Schiffbau und Schienenfahrzeugbau. Diese Werkstoffe sind wegen ihrer schwierigen maschinellen Bearbeitbarkeit bekannt, und zwar aufgrund der Anwesenheit von sehr harten und abrasiven Verstärkungen. Der Zweck der diesem Beitrag zugrunde liegenden Studie bestand darin, den Einfluss der Schneidparameter, der Schneidumgebung und der Wärmebehandlung auf die Oberflächenrauheit nach dem Drehen von Al 356/15 SiC-MMCs zu bestimmen. Hierzu wurden Versuche bei verschiedenen Schnittgeschwindigkeiten, Vorschubraten, Wärmebehandlungen (im Anlieferungszustand, lösungsgeglüht und gealtert) und Schneidumgebungen (MQL, Druckluft und trockene Umgebung) durchgeführt. Verbesserte Werte der Oberflächenrauheit ergaben sich für steigende Schnittgeschwindigkeiten und reduzierte Vorschubraten. Die Oberflächenrauheit bei Verwendung der MQL-Technik war niedriger als die Oberflächenrauheit für die anderen Schneidumgebungen. Die optimale Kombination der Bearbeitungsparameter wurde ermittelt. Mit einer Schnittgeschwindigkeit von 15 m × min−1, einer Vorschubrate von 0.1 mm × rev−1 und der Schneidumgebung MQL wurden Schneidbedingungen gefunden, die für die angelassenen Werkstoffe zu anwendbaren Lösungen führen.


*Correspondence Address, Assoc. Prof. Dr. Erol Kilickap, Department of Mechanical Engineering, Dicle University, 21280 Diyarbakir, Turkey. E-mail:

Assoc. Prof. Dr. Erol Kilickap received his BSc, MSc and PhD degrees in Mechanical Engineering from Firat University in Elazığ, Turkey, in 1991, 1997 and 2003, respectively. He is working as Associate Professor at Dicle University, Diyarbakır, Turkey. His general area of interest includes machining of composites and metal cutting mechanics.


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Published Online: 2016-03-29
Published in Print: 2016-04-04

© 2016, Carl Hanser Verlag, München

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