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    • 3. 发明公开
    • DEEP HOLE MACHINING METHOD
    • EP3680046A1
    • 2020-07-15
    • EP17924329.0
    • 2017-09-07
    • OSG Corporation
    • YAMAMOTO, Takahiro
    • B23B35/00B23B41/00B23B51/02
    • A drill is a long drill that is provided with a discharge groove having a helix angle of 25 degrees, in which a groove length is 30D or more. Thinning processing is performed on a leading end portion of the drill and a gash portion that is connected to the discharge groove further to an inner side in the radial direction than an outer peripheral surface. A circular arc groove is formed in a section connecting a thinning face and a gash face, and a chip discharge performance is improved. When forming a deep hole, in a guide hole forming process, a guide hole with an inner diameter d of D + 0.03 mm or less and with a depth W of 3D or more, is formed (S2 to S6). In an insertion process, the drill is rotated in a reverse direction and is inserted into the guide hole to a position just before a bottom portion of the guide hole (S11 to S13). In a deep hole forming process, the drill is rotated in a positive direction, cutting is performed from the bottom portion of the guide hole, and a deep hole is formed (S16 to S18).