公开(公告)号：EP4410461A1

公开(公告)日：2024-08-07

申请号：EP24153347.0

申请日：2024-01-23

申请人： Subaru Corporation

发明人： NAKAMOTO, Rei ,  YOKONO, Tsukasa ,  MASE, Aoi ,  SAITO, Shunsuke

IPC分类号： B23B51/02 ,  B23B35/00 ,  B23B37/00 ,  B23B51/06

CPC分类号： B23B51/02 ,  B23B2251/1820130101 ,  B23B2251/1420130101 ,  B23B2251/0420130101 ,  B23B35/00 ,  B23B51/063 ,  B23B2222/8820130101 ,  B23B2226/31520130101 ,  B23B2251/04720220101 ,  B23B2251/12220130101 ,  B23B2251/18220220101 ,  B23B2251/44320130101 ,  B23B37/00 ,  B23B2222/2820130101

摘要： The drill (1) has two to four cutting edges (2) each made of cemented carbide or polycrystalline diamond. Helical flutes (5) are formed alternately with the cutting edges (2). X-shaped thinning has been applied to the cutting edges (2). A rake angle (θ2) of the cutting edges (2) is not less than 30° and not more than 40°. A clearance angle (θ3) of the cutting edges (2) is more than 0° and not more than 8°. The cutting edges (2) each has a honed face (8) by chamfer honing. A honing angle of the honed face (8) is not less than -3° and not more than 8°.