公开(公告)号：US20040065482A1

公开(公告)日：2004-04-08

申请号：US10603657

申请日：2003-06-26

Applicant: SANDVIK AB

Inventor： Kenneth Larsson

IPC: E21B010/36

CPC classification number: E21B10/003 ,  E21B10/36

Abstract: A rock drill bit for percussive drilling, especially top hammer drilling, includes a drill head provided with rock removing members. The rock drill bit is provided with a number of external grooves for conducting cuttings, the grooves extending in the axial direction of the rock drill bit. Formed between adjacent grooves are lands which also extend in the axial direction of the rock drill bit. The rock drill bit has a thread for connection of the rock drill bit to a drill rod. Rear end portions of at least some of the lands define retrac teeth. Each retrac tooth has at least one cutting edge. At least some of the lands comprise a chip surface and a clearance surface that form therebetween an edge angle not greater than 100null.

Abstract translation: 用于冲击钻的岩石钻头，特别是顶锤钻孔，包括设置有岩石移除构件的钻头。 岩石钻头设置有多个用于进行切割的外部凹槽，凹槽沿岩石钻头的轴向延伸。 在相邻的槽之间形成的也是在凿岩钻头的轴向上延伸的焊盘。 岩石钻头具有用于将岩石钻头连接到钻杆的螺纹。 至少一些地面的后端部分限定了回拉牙齿。 每个后掠齿具有至少一个切削刃。 至少一些焊盘包括芯片表面和在其之间形成不大于100°的边缘角度的间隙表面。