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    • 9. 发明专利
    • Drill
    • 钻头
    • JP2014008549A
    • 2014-01-20
    • JP2012145133
    • 2012-06-28
    • Sumitomo Electric Hardmetal Corp住友電工ハードメタル株式会社
    • KURITSUKA KAZUMASAKAMISHIRO MASAAKINISHI KENTA
    • B23B51/00
    • B23B51/02B23B2251/04B23B2251/122B23B2251/125B23B2251/443B23P15/32B24B3/32
    • PROBLEM TO BE SOLVED: To suppress damage to a drill tip by devising a drill tip shape having a thinning part at the center of a distal end, and also to make the drill compatible with a wide variety of cutting conditions.SOLUTION: A cutting edge of a thinning part arranged in the center part of rotation is constituted of a sharp ridge line formed in an intersection between a flank and a rake face having a negative axial rake angle. An outer circumference cutting edge 2b extending from the outer end of the thinning part cutting edge to the outside in the radial direction has a cross-sectional shape in which a first curved surface 11a of a radius R1, a second curved surface 11b of a radius R2 having a curvature smaller than that of the radius R1, and a third curved surface 11c connecting between the first curved surface and the second curved surface and having a curvature smaller than that of radii R1, R2.
    • 要解决的问题:通过设计具有在远端中心处的变薄部分的钻头形状并且还使得钻头与各种切割条件相兼容来抑制对钻头的损坏。解决方案:切削刃 布置在旋转中心部分的变薄部分由形成在侧面和具有负轴向前角的前刀面之间的交叉处形成的尖锐脊线构成。 从减薄部切削刃的外端向径向外侧延伸的外周切削刃2b具有半径R1的第一曲面11a,半径R1的第二曲面11b, R2的曲率小于半径R1的曲率,第三曲面11c连接在第一曲面和第二曲面之间,曲率比半径R1,R2的曲率小。