Manufacture of rotary drill bits

Details Manufacture of rotary drill bits Manufacture of rotary drill bits

E - Fixed Constructions

21

B

57/23

E21B 10/46 (2006.01) B22F 7/06 (2006.01) E21B 10/56 (2006.01)

Patent

CA 1287224

"Improvements in or relating to the manufacture of rotary drill bits" ABSTRACT OF THE DISCLOSURE A method of manufacturing by a powder metallurgy process a rotary drill bit including a bit body having a plurality of cutting elements mounted on the outer surface thereof comprises the steps of forming a hollow mould for moulding at least a portion of the bit body, packing the mould with powdered matrix material, and infiltrating the material with a metal alloy in a furnace to form a matrix. Before packing the mould with powdered matrix material, there are positioned in spaced locations on the interior surface of the mould a plurality of cutting elements, each of which is formed of a material, such as a polycrystalline diamond material, which is thermally stable at the temperature necessary to form the matrix. Also positioned in the mould, adjacent the rearward side of each cutting element, is a support material such that, at least after formation of the matrix, the support material has a higher modulus of elasticity than the matrix.

469189

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