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US 2015/0352646 A1Published application
Cutting insert and indexable rotary cutting tool
AssigneeTungaloy Corporation
InventorsKedar Suresh BHAGATH, Yuji SHINJYO, Isamu SAITO
Life of this patent
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Abstract
A cutting insert includes a cutting edge having an involute-curve approximate shape. A cutting edge is formed so as to wholly take on a first curved shape with a first curvature radius when the cutting insert is viewed from the end surface, and is formed so that a large part of the cutting edge takes on a second curved shape with a second curvature radius when the cutting insert is viewed from the side surface.
Claims18
-15. (canceled)
A cutting insert comprising:
- a first end surface;
- a second end surface being opposite to the first end surface;
- and a peripheral side surface extending between the first end surface and the second end surface,
- wherein at least one cutting edge having an arc shape is formed on an intersecting ridgeline portion between the peripheral side surface and at least one of the first end surface and the second end surface, and
- wherein the cutting edge is formed so as to follow one first curved shape having a constant first curvature radius when the cutting insert is viewed from the end surface thereof, and is formed so that at least over half the cutting edge follows one second curved shape having a constant second curvature radius when the cutting insert is viewed from the side surface thereof.
2 more elements
A cutting insert comprising:
- opposing first and second end surfaces, each having a substantially parallelogram shape and four corner portions;
- a peripheral side surface extending between the first end surface and the second end surface, the peripheral side surface comprising a pair of opposing long side surfaces connecting to a pair of opposing short side surfaces;
- an insert median plane (1M) passing through the peripheral side surface, and between the first and second end surfaces, the cutting insert having mirror symmetry about the insert median plane;
- a mounting hole passing between the first and second end surfaces;
- an axis of rotation (A) passing through the mounting hole, the first and second end surfaces having 180° rotational symmetry about the axis of rotation (A);
- an intersecting ridgeline portion formed between the pair of long side surfaces and each of the first and second end surfaces;
- wherein:
- a cutting edge is formed on each intersecting ridgeline portion and extends the entire length from one short side surface to another;
- when viewed from its associated end surface, each cutting edge follows a first curved shape having a constant first curvature radius for its entire length;
- when viewed from its associated long side surface, said each cutting edge follows a second curved shape having a constant second curvature radius for more than one-half of its length but less than its entire length;
- and
- the first radius of curvature differs from the second radius of curvature.
9 more elements
Dependencies are inferred from the claim text.