Patent ID: 8347683
Filing Date: 2013-01-08
Classification: B24C,C21D,E21B,F16J,Y10T

Abstract:
1. A rock bit, comprising: a shaft including a sealing surface and further including a cylindrical bearing surface adjacent the sealing surface; a roller cone having an annular gland; wherein the roller cone is rotatably mounted to the shaft such that the annular gland aligns with the sealing surface; and wherein the sealing surface has a surface texture comprised of a plurality of dimples having a random distribution formed by shot peening in a two step process including a first shot peening action wherein the sealing surface is bombarded at a first intensity level by first small spherical media of a first average size and a subsequent second shot peening action wherein the sealing surface is bombarded at a second intensity level by second small spherical media of a second average size.