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Parametric Experimental Study and Design of Experiment Modelling of Sapphire Grinding

K. Wasmer, P.-M. Pochon, D. Sage, J.H. Giovanola

Journal of Cleaner Production, vol. 141, pp. 323-335, January 10, 2017.


This study investigates and models the grinding process of single crystal sapphire. Five parameters: the wheel speed, the feed speed, the vertical feed, the ultrasonic assistance and the crystallographic direction were considered via a design of experiments (DoE) approach. The responses were multiple but can be divided in three groups: the process, the machine and the grinding quality. DoE results revealed that the parameters interact in a complex manner and depends on the responses. Therefore, to gain a better understanding of the grinding process of sapphire, the interactions between parameters have also to be taken into consideration. It was found that three main parameters have the largest influences on the tangential grinding forces: the wheel speed, the feed speed and the vertical feed. In contrast, the median defect area is mainly impacted by the quadratic effects of the wheel speed and vertical feed followed by various interactions. After an optimization procedure, the second optimum for the tangential forces was found to be very close to the best optimum for the median defect area. The optimum solution is: a wheel speed of 7'500 rpm, a feed speed of 60 mm∕min, a vertical feed of 12.5 μm∕pass, no ultrasonic assistance and grinding along the c-axis. This set of parameters was validated with additional and repeated tests on both Verneuil and Kyropouloas sapphire. Finally, it came out that the optimum solution has also a very good productivity.

@ARTICLE(http://bigwww.epfl.ch/publications/wasmer1701.html,
AUTHOR="Wasmer, K. and Pochon, P.-M. and Sage, D. and Giovanola, J.H.",
TITLE="Parametric Experimental Study and Design of Experiment Modelling
	of Sapphire Grinding",
JOURNAL="Journal of Cleaner Production",
YEAR="2017",
volume="141",
number="",
pages="323--335",
month="January 10,",
note="")

© 2017 Elsevier. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from Elsevier. This material is presented to ensure timely dissemination of scholarly and technical work. Copyright and all rights therein are retained by authors or by other copyright holders. All persons copying this information are expected to adhere to the terms and constraints invoked by each author's copyright. In most cases, these works may not be reposted without the explicit permission of the copyright holder.
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