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    • 10. 发明授权
    • Deep-hole drill having back-tapered web
    • 深孔钻具有后锥形网
    • US07740426B2
    • 2010-06-22
    • US11483626
    • 2006-07-11
    • Takahiro Yamamoto
    • Takahiro Yamamoto
    • B23B51/02
    • B23B51/02B23B2250/12B23B2251/244B23B2251/402Y10T408/455Y10T408/9097
    • A drill having a web which is provided by a central portion of a cylindrical main body of the drill and which includes a back-tapered portion and a constant-thickness portion. The cylindrical main body has a large diameter portion and a small diameter portion contiguous to the large diameter portion, such that a step is provided between the large and small diameter portions. The large diameter portion provided by the axially distal end portion of the cylindrical main body has an axial length which is larger than an axial length of the back tapered portion of the web provided by the axially distal end portion of the web, such that a boundary between the back-tapered portion and the constant-thickness portion of the web is located in the large diameter portion of the cylindrical main body.
    • 一种钻头,其具有由钻头的圆柱形主体的中心部分提供并且包括后锥形部分和恒定厚度部分的腹板。 圆筒形主体具有与大直径部分相邻的大直径部分和小直径部分,使得在大直径部分和小直径部分之间设置台阶。 由圆柱形主体的轴向远端部分提供的大直径部分具有的轴向长度大于由幅材的轴向远端部分提供的幅材的后锥形部分的轴向长度,使得边界 在腹板的后锥形部分和恒定厚度部分之间位于圆柱形主体的大直径部分中。