Drill and method of forming perforations

专利名称：Drill and method of forming perforations发明人：沢辺 輝雄,斉藤 耕治,加藤 勝申请号：JP2014545750申请日：20131107公开号：JP6393620B2公开日：20180919

摘要：A drill capable of efficiently performing high-quality drilling machining on amaterial which is hard to be cut such as CFRP and the like is provided. The drill includes adrill body 4 having a shank portion 2 at a rear side of the drill main body and a cuttingportion 3 at a front side of the drill main body, a first land A to a fourth land D at thecutting portion 3, a first cutting portion groove 5a to a fourth cutting portion groove 5dprovided between the lands of the first land A to the fourth land D, a pilot blade 6formed at the tip of the cutting portion 3, a diameter-enlarging spiral thread portion 9having a group of threads of diameter-enlarging spiral threads AK1-DK4 continuouslyfollowing the pilot blade 6, a finished spiral thread portion 12 having a group of threadsof finishing spiral threads AF1-DF5, which have the same height, and continuouslyfollowing the diameter-enlarging spiral thread portion 9, a diameter-enlarging spiralblade portion 18 having a group of blades of the diameter-enlarging spiral threads AK1-DK4, and a finishing spiral blade portion 19 having a group of blade of the finishing spiralthreads AF1-DF5. A cutting feed rate is set to an amount so that a spiral convex part willnot be formed on the wall surface of a cutting hole formed in a material to be machined,and therefore the wall surface will be finished as a flat wall.

申请人：株式会社ミヤギタノイ,秋田県

地址：宮城県刈田郡七ケ宿町字萩崎１５番地１号,秋田県秋田市山王４丁目１番１号

国籍：JP,JP

代理人：松下 亮

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