Method of making tool inserts and drill bits
OwnerNicoll A. D. Campbell, Henry B. Dyer +3inventors
InventorsNicoll A. D. Campbell, Henry B. Dyer, Rainer Dietrich, Cornelius Phaal, Douglas J. Reid
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Abstract
A method of making inserts suitable for tool or drill bits which includes the step of fragmenting, e.g. by means of a laser beam, an abrasive compact in a plurality of discrete, non-segmental fragments. The inserts may have a variety of shapes, some of which are new, such as conical, truncated conical or truncated pyrimidal. The inserts are particularly useful for wire-drawing die blanks and core or oil-well drill bits.
Claims2
A wire-drawing die insert comprising an abrasive compact fragment selected from the group consisting of diamond and cubic boron nitride in the shape of a truncated pyramid or a truncated cone and having a centrally located hole extending from the base to the truncated apex and suitably embedded in a metal or cemented carbide support so that the direction of wire drawing will be from the base to the truncated apex.
A drill bit comprising a plurality of fragments of abrasive compact selected from the group consisting of diamond and cubic boron nitride in the shape of a truncated pyramid or a truncated cone with the base of each fragment suitably mounted in a metal matrix.
Dependencies are inferred from the claim text.