Roller cone for drill bit having improved resistance to fatigue cracking
US6598689B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 17, 2000 |
| Grant date | Jul 29, 2003 |
| Priority date | — |
| Expiry date | Aug 17, 2020 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB23K26/356
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A roller cone for a drill bit is disclosed which includes a cone body having a plurality of sockets. An interior portion of at least one of the sockets is treated on an interior surface of the socket to provide a residual compressive stress proximate the interior of the socket to reduce stress cracking. Forms of treating include shot peening, laser shock peening and hammer peening. In one embodiment, the socket is treated over approximately the lower 50 percent of the lateral wall. In another embodiment, the socket is treated on the bottom surface from the lateral wall inward approximately 33 percent of the diameter of the socket. Another aspect of the invention is a roller cone for a drill bit including a cone body having a plurality of sockets formed in the cone. In this aspect, an interior portion of at least one of the sockets is locally annealed on an interior surface of the socket. In one embodiment, the socket is locally annealed over approximately the lower 50 percent of the lateral wall. In another embodiment, the socket is locally annealed on the bottom surface from the lateral wall inward approximately 33 percent of the diameter of the socket.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.