公开(公告)号：US20040245023A1

公开(公告)日：2004-12-09

申请号：US10808457

申请日：2004-03-25

Applicant: SANDVIK AB

Inventor： John Barry

IPC: E21B010/36

CPC classification number: E21B10/58 ,  E21D21/0053

Abstract: A drill bit assembly includes a drill bit having a leading end to which a drill tip is bonded. The drill tip has a front cutting edge, a pair of side cutting edges, a rear end and a pair of parallel side walls extending between the respective edges. The leading end is arranged to support the drill tip along the rear end and against the parallel side walls. The drill bit includes a bore extending axially therethrough and opening into the leading end. The drill tip extends across the bore but permits egress of flushing liquid from the bore. The drill tip includes projections arranged to cooperate with an engagement face formed at the leading end to locate the drill tip in a bonding position relative to the leading end prior to bonding of the drill tip to the leading end. The cooperation is such as to resist shifting movement of the drill tip in a direction of elongation of the tip and out of the bonding position.

Abstract translation: 钻头组件包括钻头，其具有与钻头接合的前端。 钻头具有前切削刃，一对侧切削刃，后端和在相应的边缘之间延伸的一对平行的侧壁。 前端被布置成沿着后端和平行的侧壁支撑钻头尖端。 该钻头包括一个轴向延伸穿过并穿过其前端的孔。 钻尖延伸穿过孔，但允许从孔中排出冲洗液。 钻尖包括突出部，其布置成与形成在前端处的接合面协作，以在将钻头接合到前端之前将钻头定位在相对于前端的结合位置。 这种协作是为了抵抗钻头在尖端的伸长方向上的移动而脱离接合位置。