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IJAT Vol.8 No.6 pp. 874-879
doi: 10.20965/ijat.2014.p0874
(2014)

Paper:

Improvement of Chip Evacuation in Drilling of Lead-Free Brass Using Micro Drill

Hideharu Kato*, Shingo Nakata*, Noriaki Ikenaga*,
and Hiroaki Sugita**

*Kanazawa Institute of Technology, 3-1 Yatsukaho, Hakusan, Ishikawa 924-0838, Japan

**OSG Corporation, 1-15 Honnogahara, Toyokawa, Aichi 442-8544, Japan

Received:
April 1, 2014
Accepted:
August 26, 2014
Published:
November 5, 2014
Keywords:
micro drill, lead-free brass, oil mist, nick, thrust force, chip evacuation
Abstract

As the miniaturization of integrated circuits has progressed, the penetration holes of bonding jigs have become smaller. However, micro drills have a tendency to break when drilling small holes with high aspect ratios. Moreover, to reduce the impact on the environment, there has been a recent trend towards the use of lead-free brass as jig materials, but these are very difficult to drill. In the present study, small holes are drilled in lead-free brass using a micro drill, and the effects of web thinning, the helix angle, and the nick geometry on chip evacuation are investigated. The results indicate that drills with a helix angle of 15° have the longest tool life. The formation of a nick on the cutting edge is found to help decrease the thrust force during deep drilling. A drill with a relatively shallow nick perpendicular to the cutting edge have excellent chip discharge performance, and its cutting force is stable. Nick treatment effectively decreases the thrust force at a deep drilling position.

Cite this article as:
H. Kato, S. Nakata, N. Ikenaga, and <. Sugita, “Improvement of Chip Evacuation in Drilling of Lead-Free Brass Using Micro Drill,” Int. J. Automation Technol., Vol.8, No.6, pp. 874-879, 2014.
Data files:
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Last updated on Dec. 10, 2019