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US 7,241,089 B2Granted
Drill insert having curved cutting edges
AssigneeAllied Machine & Engineering Corp.
InventorsWendell E. Mast, Joseph P. Nuzzi
Life of this patent
Estimating the term…
Abstract
A spade drill insert and drilling tool assembly is provided wherein the spade drill insert body comprises curved cutting edges and a lip groove having a trough substantially parallel to a plane formed through each adjacent curved cutting edge, which provides a significant improvement in chip formation during cutting operations.
Claims20
A drill insert comprising:
- a drill insert body having a first end opposite a second end, a first face side opposite and parallel to a second face side, and a first land side opposite a second land side, the first and second land sides formed between the ends and the face sides;
- wherein the second end comprises at least two cutting edges formed transverse to each other, wherein at least a portion of each cutting edge is curved;
- and
- a groove formed in each face side adjacent the cutting edge, the groove having a trough substantially parallel to the adjacent curved cutting edge, wherein the depth of the groove decreases, in a direction away from a center of the drill insert body and toward one of the land sides of the drill insert body, at the portion of each cutting edge that is curved.
1 more element
A drill insert comprising:
- a drill insert body having a first end opposite a second end, a first face side opposite and parallel to a second face side, and a first land side opposite a second land side, the first and second land sides formed between the ends and the face sides;
- a groove formed in each face side of the drill insert body adjacent to and parallel to at least a portion of the second end;
- and
- wherein the depth of the groove decreases, in a direction away from a center of the drill insert body and toward one of the land sides of the drill insert body, along at least a portion of each groove.
1 more element
A drilling tool assembly comprising:
- a holder having a first end and a second end, wherein the second end comprises a shank portion adapted to be fixedly attached in a drilling machine, wherein the first end comprises a holder slot having a bottom seating surface over at least a portion of the holder slot and at least one attachment arm positioned on each side of the holder slot, wherein each attachment arm has at least one aperture formed therein;
- and
- a drill insert comprising a drill insert body having a first end opposite a second end, a first face side opposite and parallel to a second face side, and a first land side opposite a second land side, the first and second land sides formed between the ends and the face sides, wherein the second end comprises at least two cutting edges formed transverse to each other, wherein at least a portion of each cutting edge is curved, and a groove formed in each face side adjacent the cutting edge, the groove having a trough substantially parallel to the adjacent curved cutting edge, wherein the depth of the groove decreases, in a direction away from a center of the drill insert body and toward one of the land sides of the drill insert body, at the portion of each cutting edge that is curved.
Dependencies are inferred from the claim text.