发明名称 |
ROTARY DRILL BIT WITH CUTTING INSERT HAVING EDGE PREPARATION |
摘要 |
A rotary drill bit for engaging an earth strata material includes an elongate drill bit body having an axial forward end and an axial rearward end, and a cutting insert attached to the axial forward end of the elongate drill bit body. The cutting insert has an elongate insert body rotatable about a central axis and includes a pair of symmetrical halves symmetrical about the central axis, each symmetrical half including a leading face, a top surface having a relief surface, a T-land surface extending between the leading face and the relief surface and a cutting edge formed at the intersection of the T-land surface and the relief surface. The cutting edge can have a negative axial rake angle. The relief surface can include a primary relief surface and a secondary relief surface. |
申请公布号 |
US2014318871(A1) |
申请公布日期 |
2014.10.30 |
申请号 |
US201313871006 |
申请日期 |
2013.04.26 |
申请人 |
KENNAMETAL INC. |
发明人 |
Paros Nicholas J.;George Stephen M.;Sheffler Glenn W.;Rowlett Don C. |
分类号 |
E21B10/58 |
主分类号 |
E21B10/58 |
代理机构 |
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代理人 |
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主权项 |
1. A rotary drill bit for engaging an earth strata material, the rotary drill bit comprising:
an elongate drill bit body having an axial forward end and an axial rearward end; and a cutting insert attached to the axial forward end of the elongate drill bit body, the cutting insert having an elongate insert body rotatable about a central axis, the elongate insert body having a pair of symmetrical halves symmetrical about the central axis, each symmetrical half comprising:
a leading face;a top surface having a relief surface;a T-land surface extending between the leading face and the relief surface of the top surface; anda cutting edge formed at the intersection of the T-land surface and the relief surface of the top surface. |
地址 |
Latrobe PA US |