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    • 5. 发明申请
    • A DRILLING TOOL
    • 钻井工具
    • WO2006114306A1
    • 2006-11-02
    • PCT/EP2006/003887
    • 2006-04-26
    • IRWIN INDUSTRIAL TOOL COMPANY A/SPEDERSEN, Hans, Christian
    • PEDERSEN, Hans, Christian
    • E21B10/44B23B51/02
    • B28D1/146B23B51/02B23B2226/75B23B2251/043B23B2251/204B23B2251/406B23B2251/50E21B10/445
    • A drill, such as a hammer drill, comprises a shank part adapted to be received in a tool-holder, an axially opposite drill head (13), and a conveying part. (11) interconnecting said shank part and said drill head (13). The drill head has a free end surface defining a diametrically extending main cutting edge ( 16) having a tip (17), and a pair of auxiliary cutting edges (18) extending radially in relation to the tip and defining with the main cutting edge a pair of opposite obtuse angles (180° - o) so as to define a pair of opposite sectors (20) of said free end surface. The conveying part (11) defines only two helical flutes (12) opening into the opposite obtuse angled sectors (20). In order to increase the possible drilling speed of the drill, the total cross sectional area of the flutes (12) amounts to 45 - 55 % of the total circular cross-sectional area of the conveying part (11) of the drill. An axially extending inlet portion (22) of each of the flutes (12) has an axial length (I), which is 25 - 35 % of the axial width (w) of each of the helical flutes. The pitch angle of the helical flutes (12) is 30° - 45°, preferably 35° - 40°.
    • 诸如锤钻的钻头包括适于容纳在工具架中的柄部分,轴向相对的钻头(13)和输送部分。 (11),其将所述柄部和所述钻头(13)相互连接。 所述钻头具有限定具有尖端(17)的径向延伸的主切削刃(16)的自由端表面,以及一对相对于所述尖端径向延伸并且与所述主切削刃a形成的辅助切削刃(18) 一对相对的钝角(180°-o),以便限定所述自由端表面的一对相对的扇形部分(20)。 输送部分(11)限定仅有两个螺旋槽(12),该螺旋槽(12)通向相对的钝角部分(20)。 为了增加钻头的可能的钻削速度,凹槽(12)的总横截面面积相当于钻头输送部分(11)的总圆形横截面面积的45-55%。 每个凹槽(12)的轴向延伸的入口部分(22)具有轴向长度(I),其为每个螺旋槽纹的轴向宽度(w)的25-35%。 螺旋槽(12)的桨距角为30°-45°,优选为35°-40°。