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    • 2. 发明申请
    • MULTI-BIT DRILL
    • 多钻头
    • WO98056527A2
    • 1998-12-17
    • PCT/IB1998/001134
    • 1998-06-05
    • B23B51/02B23B
    • B23B51/02B23B2210/12B23B2224/20B23B2224/28B23B2224/32B23B2228/10B23B2251/406Y10S408/712Y10T407/1904Y10T408/78Y10T408/892Y10T408/904Y10T408/9046Y10T408/906
    • A drill (20) having an elongated body (11) including a fluted land (12) and a shank (25). The fluted land (12) includes a plurality of radial grooves (47, 49, 51) of reduced material thickness formed therein to the depth of the flutes (27, 29, 31). The grooves (47-51) define discrete segments (53, 55, 57) of the drill (20). Each segment (53, 55, 57) has a facet (59, 61, 63) which has the relief of a drill tip (12) so that when the exposed drill tip (12) becomes dull, the segment (53) can be broken off at the notch exposing a successive, sharp drill tip. The drill (20) can have the cutting edges coated with an appropriate protective material such as TiN, titianium nitride, titanium carbide, titanium carbonitride or any other appropriate coating material to improve cutting and preserve the edge.
    • 具有细长主体(11)的钻头(20),所述细长主体(11)包括槽纹脊(12)和柄(25)。 带槽纹的区域(12)包括形成在其中的凹槽(27,29,31)的深度的减小的材料厚度的多个径向槽(47,49,51)。 凹槽(47-51)限定了钻(20)的离散段(53,55,57)。 每个段(53,55,57)具有小面(59,61,63),其具有钻头(12)的浮雕,使得当暴露的钻头(12)变钝时,段(53)可以是 在切口处断裂,暴露出连续尖锐的钻尖。 钻头(20)可以具有涂覆有适当的保护材料如TiN,氮化钛,碳化钛,碳氮化钛或任何其他合适的涂层材料的切割边缘,以改善切割和保留边缘。