Manufacture of rotary drill bits

Details Manufacture of rotary drill bits Manufacture of rotary drill bits

1986-10-24

1988-10-25

Lechert, Jr., Stephen J.

Powder metallurgy processes

Powder metallurgy processes with heating or sintering

Making composite or hollow article

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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