| 摘要 |
<p>An object of the present invention is to provide an ultrasonic vibration cutting method which can improve the smoothness of a worked surface as well as the service life of a drill by reducing the cutting resistance owing to excessive friction caused during a drilling process by reinforcing fibers included in a fiber reinforced plastic member, and a fiber reinforced plastic member manufactured by the method. According to the present invention, there is provided an ultrasonic vibration cutting method for drilling a workpiece by using a drill, to which ultrasonic torsional mode vibration in its rotational direction is applied. It is characterized in that said workpiece is a fiber reinforced plastic member including therein carbon fibers as reinforcing fibers as well as a fiber reinforced plastic member including therein carbon fibers as reinforcing fibers. The drilling by a drill, to which ultrasonic torsional mode vibration in its rotational direction is applied, is characterized in that a drilled surface(s) is (are) substantially smooth.</p> |
