Manufacture of rotary drill bits

Details Manufacture of rotary drill bits Manufacture of rotary drill bits

1988-10-31

1989-10-17

Parker, Roscoe V.

Metal tools and implements, making

Blank or process

Drill

B21K 502, E21B 1046

Patent

active

048738956

ABSTRACT:
There is provided a method of manufacturing a rotary drill bit of the kind including a plurality of cutting structures mounted in sockets in the bit body and projecting from the face of the bit. The method comprises providing a clearance between each cutting structure and its socket and filling the clearance with a settable liquid, the settable liquid being such as to solidify at a temperature less than 400.degree. C. and to retain its integrity, after solidification, at least up to a temperature of 180.degree. C. The solidified liquid acts as a gap filler and provides an interference fit between the cutting structure and the socket. Suitable gap filing settable liquids are: anaerobic adhesive, epoxy resin, dental amalgam, tin/lead solder and bismuth/antimony alloy.

REFERENCES:
patent: 4605157 (1986-08-01), Barr et al.

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