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公开(公告)号:US07101125B2
公开(公告)日:2006-09-05
申请号:US10738469
申请日:2003-12-17
IPC分类号: B23B51/02
CPC分类号: B23B51/02 , B23B2250/12 , B23B2251/046 , B23B2251/402 , B23B2251/50 , Y10T408/9097
摘要: A twist drill including a cutting tip having a front flank face, a substantially cylindrical tool body extending rearwardly from the cutting tip, and a shank. The tool body includes a rotational axis therethrough and at least one flute formed on an outer peripheral surface thereof and extending to the front flank face. The at least one flute includes a first helical portion opening to the front flank face and a second helical portion extending from the rear end of the first helical portion toward the rear portion of the tool body. The second helical portion twists in a direction opposite of the first helical portion.
摘要翻译: 一种麻花钻,包括具有前侧面的切割尖端,从切割尖端向后延伸的大致圆柱形的工具主体和柄。 工具主体包括穿过其中的旋转轴线和至少一个形成在其外周表面上的并且延伸到前侧面的凹槽。 所述至少一个凹槽包括通向所述前侧面的第一螺旋部分和从所述第一螺旋部分的后端朝向所述工具主体的后部延伸的第二螺旋部分。 第二螺旋部分在与第一螺旋部分相反的方向上扭转。