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US 2004/0001741 A1Published application
Spur point drill insert
AssigneeAllied Machine & Engineering Corp.
InventorsWendell E. Mast, Brian Keim
Life of this patent
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Abstract
A cutting tool insert having a specialized spur point geometry at the center of the insert. The insert comprises a spur point cutting portion and a blade cutting portion wherein the spur point provides stability by providing a spot and allowing a flexible workpiece to partially spring back when the spur breaks through. The spur point insert facilitates the cutting of relatively thinner workpieces and workpieces requiring the tool to have a longer reach to the hole, while minimizing the burr resulting from the drilling operation.
Claims20
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 comprises a generally planar surface, wherein the second side comprises a first cutting portion formed on a first insert diameter and a second cutting portion formed on a second insert diameter, wherein the first cutting portion comprises at least two cutting edges forming a primary included angle and wherein the cutting edges of the first cutting portion extend from opposite ends of a chisel point to the first insert diameter, wherein the second cutting portion comprises at least two cutting edges forming a secondary angle, wherein the cutting edges of the second cutting portion extend from the first insert diameter to the second insert diameter.
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 a first cutting portion formed on a first insert diameter and a second cutting portion formed on a second insert diameter generally equivalent to the width of the drill insert body, wherein the first cutting portion comprises at least two cutting edges formed transverse to each other on parallel planes and forming a primary included angle and wherein the cutting edges of the first cutting portion extend from opposite ends of a chisel point to the first insert diameter, wherein the second cutting portion comprises at least two cutting edges formed on parallel planes and forming a secondary angle, wherein the cutting edges of the second cutting portion extend from the first insert diameter to the second insert diameter.
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 body having at least a first side and a second side, wherein the first side of the drill body comprises a generally planar surface, wherein the second side comprises a first cutting portion formed on a first insert diameter and a second cutting portion formed on a second insert diameter, wherein the first cutting portion comprises at least two cutting edges forming a primary included angle and wherein the cutting edges of the first cutting portion extend from opposite ends of a chisel point to the first insert diameter, wherein the second cutting portion comprises at least two cutting edges forming a secondary angle, wherein the cutting edges of the second cutting portion extend from the first insert diameter to the second insert diameter 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 first side of the drill insert body which cooperates with the locating boss of the bottom seating surface to allow the insert to be seated against the bottom seating surface.
Dependencies are inferred from the claim text.