Affiliation:
1. Doshisha University
2. University of Shiga Prefecture
Abstract
Recently, a new drilling technology has been attracting attention using a
super-high-speed spindle and micro diameter drills (less than 0.2 mm). In these drilling conditions,
B-RING damage extends more than internal damage around the drilled holes. Therefore, we
investigated the best drilling conditions for control of the B-RING, considering productivity. The
following conclusions were obtained. (1) The temperature of the drilling tool is raised by decreasing
the heat capacity of the drill. B-RING damage around the drilled hole is especially generated under
drilling conditions using the super-high-speed spindle and micro diameter drill. (2) B-RING is
mainly caused by the heat being conducted to the hole wall of the PWB. (3) Raising the R point
height is an effective method for preventing B-RING damage. (4) We confirm obtaining the best
drilling condition by considering B-RING and productivity.
Publisher
Trans Tech Publications, Ltd.
Subject
Mechanical Engineering,Mechanics of Materials,General Materials Science
Cited by
2 articles.
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