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    • 4. 发明公开
    • DRILL BIT
    • 钻头
    • EP2572849A1
    • 2013-03-27
    • EP11783209.7
    • 2011-04-19
    • Kabushiki Kaisha Miyanaga
    • MIYANAGA, Masaaki
    • B28D1/14
    • B28D1/146B23B51/00B23B2226/75B23B2251/205B23B2251/282B23B2270/62E21B10/602Y10T408/455
    • An object is to provide a drill bit with improved strength of joint between a bit tip and a bit shaft without diminishing dust suction performance of the drill bit. A drill bit 1 includes: a bit tip 3 including at least three cutting edge portions arranged at the distal end of the bit tip 3 such that they are spaced apart from each other in a circumferential direction, each cutting edge portion 3c having a rake face 3s and a relief face 3e forming a joint ridge L1 serving as a cutting edge; and a bit shaft 2 having a distal end face 2F welded to a proximal end face of the bit tip 3 such that the bit shaft 2 rotates integrally with the bit tip 3. The bit shaft 2 includes a dust suction passage 4 extending in the longitudinal direction of the bit shaft 2, such that the distal end of the dust suction passage 4 extends to a distal end portion of the bit shaft. A dust suction auxiliary passage 6 is formed at the distal end portion of the bit shaft 2, such that the dust suction auxiliary passage 6 extends from the dust suction passage 4 orthogonally or substantially orthogonally to the dust suction passage 4, and a radially outer end 6t of the dust suction auxiliary passage 6 is open at an outer peripheral face 1F of the bit shaft 2. A proximal end portion 3b of the bit tip 3 is integrally attached to the distal end face of the bit shaft 2.
    • 本发明的目的在于提供一种钻头,其在钻头尖端和钻头轴之间具有改善的接头强度,而不会降低钻头的吸尘性能。 钻头1包括:钻头尖端3,其包括至少三个切削刃部分,所述至少三个切削刃部分布置在钻头尖端3的远端处,使得它们在圆周方向上彼此间隔开,每个切削刃部分3c具有前刀面 3s和形成用作切削刃的接合脊L1的后刀面3e; 以及具有远端面2F的钻头轴2,所述远端面2F焊接到钻头尖端3的近端面上,使得钻头轴2与钻头尖端3一体地旋转。钻头轴2包括吸尘通道4, 以便吸尘通道4的远端延伸到钻头杆的远端部分。 吸尘器辅助通道6形成在钻头杆2的远端部分,使得吸尘辅助通道6从吸尘通道4垂直或基本正交于吸尘通道4延伸,并且径向外端 吸尘辅助通道6的开口6t在钻头轴2的外周面1F开口。钻头前端3的基端部3b一体地安装在钻头轴2的前端面。