Thermal Damage of Micro Diameter Hole Drilled by Super-High-Speed Spindle in PWB
|
| Journal |
Key Engineering Materials (Volumes 389 - 390) |
| Volume |
Advances in Abrasive Technology XI |
| Edited by |
Tsunemoto Kuriyagawa, Libo Zhou, Jiwang Yan and Nobuhito Yoshihara |
| Pages |
55-60 |
| DOI |
10.4028/www.scientific.net/KEM.389-390.55 |
| Online since |
September, 2008 |
| Authors |
Hiroshi Nojiri,
Toshiki Hirogaki,
Eiichi Aoyama,
Keiji Ogawa,
Tsuyoshi Otsuka
|
| Keywords |
B-RING, Cutting Temperature, Drilling, Engineering Optimization, High Speed-Spindle, Printed Wiring Board |
| 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. |
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