Earth boring drill bit with shell supporting an external drillin

Details Earth boring drill bit with shell supporting an external drillin Earth boring drill bit with shell supporting an external drillin

1997-07-30

1999-03-09

Watts, Douglas D.

Metal tools and implements, making

Blank or process

Drill

175417, B21K 502, E21B 1052

Patent

active

058786341

ABSTRACT:
A method for making an earth boring drill bit which includes an outer shell having an external surface adapted to carry cutting elements and a unitary shank and bit core which is fitted into the outer shell. The shell and bit core are threadably engaged with one another or are interferingly engaged. The shell and bit core may be welded, secured with brazing alloys or with high temperature adhesives. In one embodiment, a ridge formed on the shank is received in a groove formed on an interior surface of the shell to prevent relative rotational movement of the shank and shell during drilling. In another embodiment, the shell is formed using matrix infiltration techniques. After the shell is formed, it is heated to braze cutters thereto. While still hot from the brazing process, the shell and shank are fitted together. After cooling the shell contracts to form heat shrink connection between the shell and the shank.

REFERENCES:
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patent: 2039494 (1936-05-01), Sanderson
patent: 4083415 (1978-04-01), Kita et al.
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patent: 4454922 (1984-06-01), Jamison et al.
patent: 4919221 (1990-04-01), Pascale
patent: 5000273 (1991-03-01), Horton et al.
patent: 5101692 (1992-04-01), Simpson
patent: 5150636 (1992-09-01), Hill
patent: 5322139 (1994-06-01), Rose et al.

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