Metal tools and implements – making – Blank or process – Drill
Patent
1988-10-31
1990-08-21
Parker, Roscoe V.
Metal tools and implements, making
Blank or process
Drill
419 9, 419 36, B22F 708
Patent
active
049495984
ABSTRACT:
A rotary drill bit is manufactured by forming a main bit body part from a machinable metal, such as steel, machining sockets in the outer surface of the main bit, inserting in each socket a thermally stable cutting structure or former which substantially fills at least the mouth of the socket and projects beyond the outer surface of the main bit body part, applying to the surface of the main bit body part, at least in an area surrounding each socket, a compound comprising powdered matrix-forming material, such as powdered tungsten carbide, mixed with a binder to form a paste, and infiltrating the matrix-forming compound with a metal alloy in a furnace to form a hard matrix. The size, location and orientation of the sockets may thus be accurately determined using conventional machining techniques, as in the case of an ordinary steel-bodied bit, but the external parts of the bit body are formed of hard solid matrix material and are thus highly resistant to erosion.
REFERENCES:
patent: 4396077 (1983-08-01), Radtke
patent: 4499795 (1985-02-01), Radtke
patent: 4505342 (1985-03-01), Barr et al.
patent: 4608225 (1986-08-01), Sakuramoto et al.
patent: 4630692 (1986-12-01), Ecer
patent: 4676324 (1987-06-01), Barr et al.
patent: 4762028 (1988-08-01), Regan
Parker Roscoe V.
Reed Tool Company Limited
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