Cutting elements for rotary drill bits

Details Cutting elements for rotary drill bits Cutting elements for rotary drill bits

1996-04-19

1998-04-21

Dang, Hoang C.

Boring or penetrating the earth

Bit or bit element

Specific or diverse material

175431, E21B 1046

Patent

active

057408742

ABSTRACT:
A preform cutting element for a rotary drag-type drill bit includes a facing table of polycrystalline diamond having a rear surface bonded to a tungsten carbide substrate. The cutting element is formed with an angled chamfer to form a straight cutting edge on the facing table. The junction between one end of the cutting edge and the remainder of the peripheral surface of the facing table is chamfered in a part-circular arc to provide a smooth transition between the cutting edge and the rest of the peripheral surface. Such transition may reduce the spalling or other damage which may be caused by steady state and impact loads in this region.

REFERENCES:
patent: 4221270 (1980-09-01), Vezirian
patent: 4705122 (1987-11-01), Wardley et al.
patent: 4724913 (1988-02-01), Morris
patent: 5379853 (1995-01-01), Lockwood et al.
patent: 5383527 (1995-01-01), Azar
patent: 5437343 (1995-08-01), Cooley et al.
patent: 5469927 (1995-11-01), Griffin

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