Method and apparatus for bonding PDC blanks
AssigneeDennis Tool Company
InventorThomas M. Dennis
Life of this patent
Estimating the term…
Abstract
The present system is directed to both a method and apparatus for manufacture of teeth for use in drill bits. The desired tooth is formed by a hard carbide, a protective disc placed on the end of the support, the joinder being accomplished by a braze metal layer. The process contemplates positioning the disc in a matching receptacle within the head of a molding apparatus wherein the head and cavity of the head are exposed to the terminus of several coolant flow lines through the head so that the disc is brought into contact with flowing coolant. The fluid coolant is delivered by a compressor at elevated pressure and is a flow of cooled gas after dehydration. Rapid flow of heat into cooled support at the base prevent deterioration of the diamond layer while allowing use of higher temperature braze metals.
Claims14
An improved brazing apparatus for bonding different materials together to form a cutting tooth wherein one of the materials is selected from boron nitride or PDC in the form of a disc which is brazed to a supportive tooth body formed of a hard carbide metal, the apparatus including a frame having a pair of opposing supportive heads, and the apparatus further comprises;
- a) a press means for moving a pair of opposing heads to a spaced relationship so that the disc is held in one of said heads in a cavity therein aligned with the opposite of said support head for bonding the disc to a tooth body;
- b) RF induction heater for heating a braze metal layer between said disc and said tooth body;
- and
- c) a gas flow supply means for providing a flow of inert or reducing gases through a passage to deliver flowing gases into intimate contact with the exposed face of said disc during heating.
Dependencies are inferred from the claim text.