| 摘要 |
This invention relates to a nicked cutting tool suitable for cutting fiber-reinforced composite materials. It has an even number of twisted grooves and lands on the cutting part and the lands have nicks thereon. The nicks are preferably designed so as to incline to the longitudinal axis of the tool, and the nicks on two lands adjacent to each other in the circumferential direction incline in opposite directions to the longitudinal axis of the tool. It is possible to design the nicks so as to incline with regard to the tangent of the helix line of the twisted grooves, and in this case, the nicks on two lands adjacent to each other in the circumferential direction incline in opposite directions with regard to the helix line. In the rotation of the tool, the lands having nicks inclining in opposite directions contact alternately with the workpiece, and the fibers of the workpiece are thereby cut securely, and the shavings are discharged smoothly. The heat generated when cutting can also be dispersed.
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