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

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...

Full description

Saved in:
Bibliographic Details
Published inInternational journal of automation technology Vol. 8; no. 6; pp. 874 - 879
Main Authors Kato, Hideharu, Nakata, Shingo, Ikenaga, Noriaki, Sugita, Hiroaki
Format Journal Article
LanguageEnglish
Published Tokyo Fuji Technology Press Co. Ltd 05.11.2014
Subjects
Aspect ratio
Cutting force
Drilling
Drills
Environmental impact
Evacuation
Integrated circuits
Jigs
Lead free
Miniaturization
Thrust
Tool life
Online AccessGet full text

Cover

More Information
Summary: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.
ISSN:1881-7629
1883-8022
DOI:10.20965/ijat.2014.p0874