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http://dx.doi.org/10.3795/KSME-A.2007.31.10.1039

Roundness Improvement and Exit Crack Prevention in Micro-USM of Soda-Lime Glass  

Hong, Ji-Hoon (서울대학교 기계항공공학부)
Kim, Duck-Hwan ((주)현대자동차)
Chu, Chong-Nam (서울대학교 기계항공공학부)
Kim, Bo-Hyun (안동대학교 기계공학부)
Publication Information
Transactions of the Korean Society of Mechanical Engineers A / v.31, no.10, 2007 , pp. 1039-1045 More about this Journal
Abstract
Ultrasonic machining (USM) is suitable for machining hard, brittle and non-conductive materials such as silicon, glass and ceramics. Usually, when micro holes are machined on glass by USM, roundness of hole entrance is poor and cracks appear around the hole exit. In this paper the machining characteristics were studied for roundness improvement and exit crack prevention. From experiments, the tool bending and the shape of tool tip affect hole roundness. When the tool tip is hemispherical, good roundness of holes was obtained. The feedrate and the rotational speed of the tool affect the exit crack. With the machining conditions of 150 rpm in spindle speed and $0.5\;{\mu}m/s$ in feedrate, micro holes with less than $100\;{\mu}m$ in diameter were machined without an exit crack.
Keywords
Micro Machining; Ultrasonic Machining; Glass;
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