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


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

April 1, 2014
August 26, 2014
November 5, 2014
micro drill, lead-free brass, oil mist, nick, thrust force, chip evacuation

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:
Hideharu Kato, Shingo Nakata, Noriaki Ikenaga, and
and Hiroaki 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.
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