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Proceedings Paper

Reliability evaluation of micro drills
Author(s): Gun H. Kim; Seong K. Lee; Kyu S. Kwon; Kyu C. Cho
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Paper Abstract

This research analyzed the specification and machinability of micro drills, which were currently manufactured and used for drilling, obtained from five different manufacturing companies (one sample from Korea, two samples from Japan, one sample each from Taiwan and German), and suggested a criterion for the evaluation of reliability of micro drills. Breaking force of micro drills (φ0.3 mm) was analyzed using samples. Also, dimension and shape of micro drills of five different manufacturing companies of Korea, German, Taiwan and Japan were analyzed. Machinability of micro drills (φ0.3 mm) obtained from five different manufacturing companies also was analyzed using a steel plate (SKS 3, 70×70×2.0 mm) with operation conditions of the spindle speed of 10,000 rpm, feed rate of 1.8 μm/min, return stroke of 0.05 mm/sec, and cycle time of 82 sec/hole for 100 times repeated drilling hole operation. On the machinability test of micro drill, wear and chip discharge of micro drill, machining accuracy (i.e., hole shape), and durability of micro drill was analyzed. The wear, locating accuracy, and durability of micro drills for high-speed repeated drilling operation were major concerning factors for the reliability evaluation. The dimension of each part of micro drill (φ0.3 mm) was almost different for five different manufacturing companies. The characteristics and dimensions of flute were also different for four different manufacturing companies. The breaking force of micro drills without flute increased as the diameter of micro drill (φ0.10, 0.15, 0.20, and 0.30 mm) increased from 0.38 to 1.73 N, but the breaking force of micro drill with flute did not showed the same trend as the diameter of micro drill increased.

Paper Details

Date Published: 21 March 2006
PDF: 7 pages
Proc. SPIE 6040, ICMIT 2005: Mechatronics, MEMS, and Smart Materials, 60401H (21 March 2006); doi: 10.1117/12.664223
Show Author Affiliations
Gun H. Kim, Jeonju Univ. (South Korea)
Seong K. Lee, HANA Mechtronics Co., Ltd. (South Korea)
Kyu S. Kwon, Jeonju Univ. (South Korea)
Kyu C. Cho, Jeonju Univ. (South Korea)

Published in SPIE Proceedings Vol. 6040:
ICMIT 2005: Mechatronics, MEMS, and Smart Materials
Yunlong Wei; Kil To Chong; Takayuki Takahashi; Shengping Liu; Zushu Li; Zhongwei Jiang; Jin Young Choi, Editor(s)

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