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US 6,685,402 B2Granted
Drill insert geometry having V-notched web
AssigneeAllied Machine & Engineering Corp.
InventorsWendell E. Mast, Joseph P. Nuzzi
Life of this patent
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Abstract
The present invention relates to a V-notched web formed on a drill insert of a drill tool assembly. The V-notched web allows greater stability and feed rates, while decreasing the heat generated at the insert tip. The present invention is provided by a drill insert comprising a drill insert body having at least two cutting edges, a web between the two cutting edges, and a web thinning notch formed on either side of the web. Each web thinning notch forms a notch cutting edge having a positive rake angle.
Claims25
A drilling tool assembly comprising:
- a holder having first and second ends and a rotational axis, wherein the second end is adapted to be fixedly attached in a drilling machine, and the first end comprises a holder slot having a bottom seating surface over at least a portion of the holder slot, the holder slot also including a locating boss extending from the bottom seating surface,
- a drill insert comprising a first and a second side, at least two cutting edges formed transverse to each other on the second side, a web between the two cutting edges, and a single web thinning notch formed on either side of the web, wherein each notch forms a notch cutting edge having a positive rake angle;
- and
- wherein the first side is adapted to have at least a portion thereof positioned in the holder slot in seating engagement with the bottom seating surface and including a locating slot formed in the bottom side which cooperates with the locating boss of the bottom seating surface to allow the insert to be seated against the bottom seating surface;
- wherein the notch has a cross-sectional geometry in the form of a “V” having a radius at the apex of the notch and transitioning to planar side walls, wherein the apex of the notch is formed along an angle transverse to a rotational axis of the drilling tool assembly.
2 more elements
A drill insert comprising:
- a drill insert body having at least a first side and a second side,
- wherein the first side of the drill body is a generally planar surface having at least one recess formed in the first side;
- wherein the second side comprises at least two cutting edges formed transverse to each other, a web formed between the two cutting edges, and a web thinning notch formed on either side of the web;
- wherein each notch forms a notch cutting edge having a positive rake angle, wherein each notch has a cross-sectional geometry in the form of a “V” having a radius at the apex of the notch and transitioning to substantially planar side walls.
1 more element
A drill insert comprising:
- a drill insert body having at least a first side, a second side, and at least two apertures,
- wherein the first side of the drill body is a generally planar surface having at least one recess formed in the first side;
- wherein the second side comprises at least two cutting edges formed transverse to each other, a web formed between the two cutting edges, and a web thinning notch formed on either side of the web;
- wherein each notch forms a notch cutting edge adjacent to and radially inward from one cutting edge of the at least two cutting edges, wherein each notch cutting edge has a positive rake angle;
- and
- wherein each notch has a cross-sectional geometry in the form of a “V” having a radius at the apex of the notch and transitioning to substantially planar side walls.
3 more elements
Dependencies are inferred from the claim text.