发明名称 |
Rotary drill bit shank, rotary drill bits so equipped, and methods of manufacture |
摘要 |
A shank configuration for rotary drill bits, is disclosed for positioning of the shank in relation to the bit body. A tapered surface or feature of the shank may be configured and sized to matingly engage a complementarily shaped surface or feature of the drill bit body and thereby become centered or positioned in relation thereto. A deformable element may be disposed between the shank and bit body. Also, the shank may comprise a material having a carbon equivalent of less than about 0.35%. A multi-pass weld procedure may be employed to affix the shank and bit body to one another wherein welds may be formed so that one weld originates at a circumferential position that differs from the origination circumferential position of its immediately preceding weld by at least about 90°. Further, a stress state may be developed within the multi-pass weld. A method of manufacture is also disclosed.
|
申请公布号 |
US2006213693(A1) |
申请公布日期 |
2006.09.28 |
申请号 |
US20050090932 |
申请日期 |
2005.03.25 |
申请人 |
ZAHRADNIK ANTON F;SULLIVAN ERIC C;SMITH R S;RUFF DANIEL E;ROBERTS DANIELLE V;MASSEY ALAN J |
发明人 |
ZAHRADNIK ANTON F.;SULLIVAN ERIC C.;SMITH R. S.;RUFF DANIEL E.;ROBERTS DANIELLE V.;MASSEY ALAN J. |
分类号 |
E21B10/36 |
主分类号 |
E21B10/36 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|