Manufacture of rotary drill bits

Powder metallurgy processes – Powder metallurgy processes with heating or sintering – Making composite or hollow article

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1481261, 148127, 164 97, 175329, 175409, 419 9, 419 11, 419 18, 419 66, 428552, 428565, 4289088, B22F 700

Patent

active

047802740

ABSTRACT:
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 postioned in spaced locations on the interior surface of the mould a plurality of cutting element, 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.

REFERENCES:
patent: 4592252 (1986-06-01), Ecer
patent: 4593776 (1986-06-01), Salesky et al.
patent: 4624830 (1986-11-01), Barr
patent: 4630692 (1986-12-01), Ecer
patent: 4669522 (1987-06-01), Griffin
patent: 4720371 (1988-01-01), Shirley

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