公开(公告)号：US20050252691A1

公开(公告)日：2005-11-17

申请号：US11083540

申请日：2005-03-18

申请人： Kenneth Bramlett ,  Anthony Griffo ,  Dah-Ben Liang ,  Adam Potticary

发明人： Kenneth Bramlett ,  Anthony Griffo ,  Dah-Ben Liang ,  Adam Potticary

IPC分类号： E21B10/00 ,  E21B10/08

CPC分类号： E21B10/08 ,  B23K26/356

摘要： The present invention relates to a roller cone drill bit that includes a bit body adapted to be rotated about a longitudinal axis, where the bit body has at least one leg depending therefrom, wherein the leg comprises a treated portion that provides a residual compressive stress, and a roller cone rotatably mounted on a journal. The treated portion treatment may comprise one selected from shot peening, laser-shock peening, and hammer peening. Further, the present invention relates to a method of manufacturing a roller cone drill bit that includes inducing a compressive stress, through plastic deformation, in at least a portion of at least one leg depending from a bit body. The inducing a compressive stress may comprise one selected from shot peening, laser-shock peening, and hammer peening.

摘要翻译： 本发明涉及一种滚子锥钻头，其包括适于围绕纵向轴线旋转的钻头体，其中所述钻头体具有从其延伸的至少一个腿部，其中所述腿部包括提供残余压应力的处理部分， 以及可旋转地安装在轴颈上的辊筒。 经处理的部分处理可以包括选自喷丸硬化，激光冲击硬化和锤击锤中的一种。 此外，本发明涉及一种制造滚子锥形钻头的方法，该方法包括通过塑性变形在至少一个腿部的至少一部分中从钻头体引起的压缩应力。 诱导压应力可以包括选自喷丸硬化，激光冲击硬化和锤击锤中的一种。