Drilled hole damage of small diameter drilling in printed wiring board

Drilling of fiber reinforced plastics: A review

“…In order to investigate the effect of the angle between the cutting edge and the fibre direction, Aoyoma et al [25] carried out an experimental work on glass reinforced plastic 1.6 mm thick using a drill with 1 mm of diameter, a cutting speed of 15.7 m/min and a feed rate of 0.063 mm/rev. The authors concluded that the damage is larger when the angle between the cutting edge and fibre direction is 45 • .…”

Effects of high speed in the drilling of glass fibre reinforced plastic: Evaluation of the delamination factor

“…Aoyama et al [8] investigated the damage after drilling holes of small diameter in printed wiring boards and concluded that delamination (which leads to ion migration) is generated along the fibre in the hole wall surface as the surface roughness increases. According to these authors, the thickness of the fibre bundle affects the internal damage of the hole, which increases together with the thickness of the fibre bundle for the same edge position angle.…”

Refined Delamination Factor Failure Characterization of Composite Wind Turbine Blade

“…Arul et al (2006) induced axial vibrations in the feed direction and studied the influence of the vibration frequency and amplitude when drilling GFRP composites. Aoyama et al (2001) investigated the damage after drilling holes of small diameter in printed wiring boards and concluded that the delamination (which leads to ion migration) is generated along the fiber in the hole wall surface as the surface roughness increases. Inoue et al (1997) investigated the relationship between the internal damage around the drilled hole and the number of holes produced.…”