04780274 is referenced by 68 patents and cites 6 patents.

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.

Title
Manufacture of rotary drill bits
Application Number
676697
Publication Number
4780274
Application Date
October 24, 1986
Publication Date
October 25, 1988
Inventor
John D Barr
Gloucestershire
GB
Agent
Browning Bushman Zamecki & Anderson
Assignee
Reed Tool Company
GB
IPC
B22F 7/00
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