DRILLING TOOL FOR COMPOSITE MATERIAL
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United States of America Patent
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Issued Date -
Nov 27, 2014
app pub date -
Sep 18, 2012
filing date -
Sep 23, 2011
priority date (Note) -
Abandoned
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Abstract
A cutting tool is suitable for cutting a composite material. A drilling tool according to one embodiment includes a drill body and a shank. The drill body includes ribs formed in a spiral shape along the axis direction of the drill body, chip discharging grooves formed between the ribs, and a drill head formed at one end of the drill body where the shank is not formed. The drill head is formed in a multi-stage and first and second cutting edges are formed interposing a step portion therebetween, and the second cutting edge is formed toward the drill head. A point angle of the first cutting edge is 90° to 130°, a dish angle of the second cutting edge is 5° to 15°, and a twist angle between the chip discharging groove and the rotational axis of the drill body is 20° to 40°.
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