公开(公告)号：EP3199279A1

公开(公告)日：2017-08-02

申请号：EP15845359.7

申请日：2015-09-28

申请人： Mitsubishi Materials Corporation

发明人： MABUCHI Masayuki ,  NARUKE Koichiro ,  TAKAHASHI Souhei ,  HIBI Takahiro ,  YAMAMOTO Tadashi ,  YANAGIDA Kazuya

IPC分类号： B23B51/00

CPC分类号： B23B51/02 ,  B23B51/00 ,  B23B51/06 ,  B23B2226/275 ,  B23B2251/04 ,  B23B2251/043 ,  B23B2251/085 ,  B23B2251/14 ,  B23B2251/18 ,  B23B2251/204 ,  B23B2251/40 ,  B23B2251/44

摘要： A drill comprising: a drill main body; a chip discharge flute; and a tip cutting edge. The tip cutting edge includes: a first tip cutting edge which extends toward the axially posterior end as it goes toward the outside in a radial direction; and a second tip cutting edge which is disposed outside the first tip cutting edge in the radial direction. The second tip cutting edge extends toward the tip in the axis direction as it goes toward the outside in the radial direction or extends to be perpendicular to the axis. The radially inner end of the second tip cutting edge is disposed on the axially posterior end with respect to the radially outer end of the first tip cutting edge. The radially outer end of the second tip cutting edge is disposed on a virtual extension line of the first tip cutting edge.

摘要翻译： 一种钻头，包括：钻头主体; 切屑排出槽; 和尖端切削刃。 前端切削刃包括：第一前端切削刃，其随着朝向径向外侧而向轴向后端延伸; 以及第二前端切削刃，该第二前端切削刃配置在第一前端切削刃的径向外侧。 第二前端切削刃随着朝向径向外侧而朝向轴线方向的前端延伸，或者延伸至与轴线正交。 第二顶端切削刃的径向内端相对于第一顶端切削刃的径向外端布置在轴向后端上。 第二顶端切削刃的径向外端布置在第一顶端切削刃的虚拟延长线上。

公开(公告)号：EP3957421A1

公开(公告)日：2022-02-23

申请号：EP20791466.4

申请日：2020-04-07

申请人： Mitsubishi Materials Corporation

发明人： YAMAMOTO Tadashi ,  HIBI Takahiro

IPC分类号： B23B51/00

摘要： In this drill, a cutting edge (3), which is formed at an intersecting ridge line part between a wall surface (5A), facing a drill rotation direction (T), of a chip discharging flute (5) formed at an outer periphery of a tip portion of a drill main body (1) that is rotated around an axis (O), and a tip flank face (4), includes an inner peripheral cutting edge (3A) located on a radially inner peripheral side with respect to the axis (O); and an outer peripheral cutting edge (3B) connected to a radially outer peripheral side of the inner peripheral cutting edge (3A). A point angle (θA) of a portion of the inner peripheral cutting edge (3A) on an inner peripheral side with respect to the axis (O) is within a range of 90° to 170°. A radial width of the outer peripheral cutting edge (3B) with respect to the axis (O) in a cross section, along the axis (O), of a rotation locus around the axis (O) is within a range of 5% to 20% of a diameter (D) of the cutting edge (3), and a point angle (θB) is larger than the point angle (θA) of the inner peripheral cutting edge (3A).