Drill reamer
AssigneeExactaform Cutting Tools Limited
InventorsJohn Inglis, Peter Raynor
Life of this patent
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Abstract
A drill reamer (20) comprises an elongate body (21) disposed about a longitudinal axis. The elongate body comprises flutes (22a-22d) having separate hard cutting sections (27a, 28′a, 28″a, 28′b, 28″b) and a soft cutting section (24a, 24b). The soft cutting section is formed of a material such as carbide having a hardness that is less than that of the hard cutting sections, which may be formed of polycrystalline diamond. At least one first hard cutting section (27a) is axially displaced relative to at least one second hard cutting section (28′a, 28″a). The reamer has a tip cutting edge (23a, 23c) and tapered cutting edge portions (24a-24d) disposed at an acute angle relative to the longitudinal axis.
Claims11
A drill reamer, comprising:
- an elongate body disposed about a longitudinal axis, the elongate body comprising a plurality of separate hard cutting sections and a soft cutting section, wherein said soft cutting section is formed of a material having a hardness that is less than said hard cutting sections and at least one first hard cutting section is axially displaced relative to at least one second hard cutting section;
- and a tip at a leading end of the drill reamer, the tip having a tip cutting edge that defines a drilling angle:
- and a plurality of flutes each having a tapered cutting edge portion disposed at an acute angle relative to the longitudinal axis, the tapered cutting edge portions being operative for drilling a tapered hole during a machining process:
- wherein the drilling angle relative to the longitudinal axis is greater than said acute angle, wherein said first hard cutting section is disposed at the tip and defines all of said tip cutting edge and defines part of said tapered cutting edge portion of at least one of said flutes.
Dependencies are inferred from the claim text.