Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : October 22, 2016 - October 23, 2016
Series of drilling tests of PCB have been carried out to investigate the shape of chips produced and the chips evacuation behavior out of drilling hole at the drilling rotational speed of from 20×103min-1 to 160×103min-1. With an increase in the drilling rotational speed, the chips evacuation out of drilling hole is very well, the chips of GFRP are short and small pieces and both of maximum cutting torque and average cutting torque are decreasing. On the other hand, the chips evacuation behavior out of drilling hole is worse because of increasing coefficient of between surface of drill flute and chip with an increase in the drilling rotational speed, and both of maximum cutting torque and average cutting torque are increasing. The chips of GFRP grow long and large pieces after adhering one chip to another chip when the drill flutes are full with chips.
