Preform cutting elements for rotary drill bits

Details Preform cutting elements for rotary drill bits Preform cutting elements for rotary drill bits

1997-10-10

2000-05-23

Tsay, Frank S.

Boring or penetrating the earth

Bit or bit element

Specific or diverse material

175431, E21B 1046

Patent

active

060655542

ABSTRACT:
A preform cutting element for a rotary drag-type drill bit comprises a front facing table of superhard material having a front surface, a peripheral surface, a rear surface bonded to a substrate of less hard material, and a cutting edge formed by at least part of the junction between the front surface and the peripheral surface. The front surface of the facing table is formed with a chip-breaking formation which is located adjacent the cutting edge and is shaped to deflect transversely of the front surface of the facing table cuttings which, in use, are removed by the cutting edge from the formation being drilled. The chip-breaking formation may comprise a peripheral groove or rebate, or an upstanding ridge or insert.

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