Patent ID: 7836792
Filing Date: 2010-11-23
Classification: E21B

Abstract:
1. A method of forming a rock bit, the method comprising: forming at least one pocket in a roller cone to a first axial depth with a first bottom, the at least one pocket having a cylindrical shape with a first diameter that is smaller than a diameter of a cutting element; carburizing an interior surface of the at least one pocket at a first depth to form a circumferential waistband of carburization about the interior surface of the at least one pocket at the first depth; deepening the at least one pocket to a second axial depth having a second bottom and removing any carburization on the first bottom, the circumferential waistband of carburization remaining in the at least one pocket; heating the roller cone; cooling the at least one pocket; placing a material on the second bottom of the at least one pocket; and installing the cutting element in the at least one pocket, the material being located between the second bottom and a base of the cutting element.