Journal
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
Volume 213, Issue 4, Pages 553-559Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jmatprotec.2012.11.005
Keywords
Ultrasonic machining; Wax coating; Glass; Surface quality; Cracks
Funding
- Priority Research Centers Program through the National Research Foundation of Korea (NRF)
- Ministry of Education, Science and Technology (MEST) of the Korean Government [2010-0020089]
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We present a new fabrication method that enables precision hole machining to be achieved by sacrificing the coating on the substrate in ultrasonic machining (USM). A hard wax coating is deposited on the glass substrate, and holes are precisely fabricated in the coated glass using USM. Finally, a wax coating is removed using a cleaning process. The wax coating protects the surface of the glass so that cracks are generated in the wax rather than on the surface. The surface accuracy of the glass substrate is evaluated at the hole entrance using the new tools in USM as a function of the thickness of the coating. The entrance diameters of the machined holes and the machining forces at the beginning of cutting are measured as a function of the thickness of the coating. The entrance cracks and out-of-roundness of the machined holes are generated in the sacrificed coating on the glass substrate; hence, the surface quality of the glass holes is enhanced in USM. (C) 2012 Elsevier B.V. All rights reserved.
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