Manufacture of rotary drill bits

Details Manufacture of rotary drill bits Manufacture of rotary drill bits

1994-05-25

1995-06-20

Watts, Douglas D.

Metal tools and implements, making

Blank or process

Drill

76DIG1, 76DIG12, 175434, B23P 1500, B21K 500

Patent

active

054252881

ABSTRACT:
A method of manufacturing a rotary drill bit includes the steps of forming the bit body with a plurality of sockets, inserting in each socket a projecting carbon former, applying a fusible hard facing material to the surface of the bit body, and around the formers, by the localised application of heat to the solid material so as to melt it and weld it to the surface of the bit body, and then replacing the formers with cutters. During the application of the hard facing material, each former is also heated by the application of heat directly to it, so as to raise the temperature of the former to a level greater than the temperature to which it would otherwise be raised solely by conduction of heat from the hard facing material. This increases the tendency for the molten material to wet the surface of the former so that the resulting aperture in the hard facing material, once the former has been removed, is accurately sized to the dimensions of the former and hence of the cutter which is subsequently to be inserted in the socket.

REFERENCES:
patent: 4499795 (1985-02-01), Radtke
patent: 4593776 (1986-06-01), Salesky et al.
patent: 4761191 (1988-08-01), Keller et al.
patent: 4762028 (1988-08-01), Regan

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