US 11,097,362 B2Granted

Cutting insert having two upper cutting edges and a lower central protuberance with four abutment walls defining an imaginary quadrilateral, and rotary cutting tool

AssigneeIscar, Ltd.

InventorYuri Men

Life of this patent

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Abstract

A cutting insert has opposing upper and lower surfaces interconnected by a peripheral side surface, an insert axis passing through the upper and lower surfaces, and first and second upper cutting edges formed at the intersection of the upper surface and the peripheral side surface. A lower central protuberance having first, second, third and fourth abutment walls extends downwardly from the lower surface. In a cross-section taken in a first horizontal plane perpendicular to the insert axis and intersecting the lower central protuberance, the first, second, third and fourth abutment walls define an imaginary quadrilateral having diagonally opposing first and third internal angles and diagonally opposing second and fourth internal angles. The first and third internal angles are equal to each other, and the second and fourth internal angles are not equal to each other. Two cutting inserts are removably secured in a rotary cutting tool.

Claims26

Dependent claims

A single-sided cutting insert (20), comprising:

opposing upper and lower surfaces (22, 24) interconnected by a peripheral side surface (26) and an insert axis (A1) passing through the upper and lower surfaces (22, 24),
an upper peripheral edge (30) at the intersection of the upper surface (22) and the peripheral side surface (26), the upper peripheral edge (30) having first and second upper cutting edges (32, 34), and
a lower central protuberance (40) extending downwardly from the lower surface (24) and away from the upper surface (22), the lower central protuberance (40) including first, second, third and fourth abutment walls (42a, 42c, 42b, 42d) transverse to the lower surface (24), the first, second, third and fourth abutment walls (42a, 42c, 42b, 42d) sequentially arranged on an envelope surface (43) extending around a perimeter of the lower central protuberance (40),
wherein in a cross-section taken in a first horizontal plane (PH1) perpendicular to the insert axis (A1) and intersecting the envelope surface (43), the first, second, third and fourth abutment walls (42a, 42b, 42c, 42d) define an imaginary quadrilateral (QI) having diagonally opposing first and third internal angles (α1, α3) and diagonally opposing second and fourth internal angles (α2, α4),
wherein the imaginary quadrilateral (QI) has first, second, third and fourth sides (S1, S2, S3, S4) associated with the first, second, third and fourth abutment walls (42a, 42b, 42c, 42d), respectively, the first internal angle (α1) formed between the first and second sides (S1, S2), the second internal angle (α2) formed between the second and third sides (S2, S3), the third internal angle (α3) formed between the third and fourth sides (S3, S4), and the fourth internal angle (α4) formed between the fourth and first sides (S4, S1), and
wherein the first and third internal angles (α1, α3) are equal to each other, and the second and fourth internal angles (α2, α4) are not equal to each other.

3 more elements

A single-sided cutting insert (20), comprising:

opposing upper and lower surfaces (22, 24) interconnected by a peripheral side surface (26) and an insert axis (A1) passing through the upper and lower surfaces (22, 24),
a through bore (28) extending along the insert axis (A1) and connecting the upper and lower surfaces (22, 24),
an upper peripheral edge (30) at the intersection of the upper surface (22) and the peripheral side surface (26), the upper peripheral edge (30) having first and second upper cutting edges (32, 34) which are spaced apart from one another by opposing first and second nose edges (33, 35), and
a lower central protuberance (40) extending downwardly from the lower surface (24) and away from the upper surface (22), the lower central protuberance (40) having an envelope surface (23) extending around a perimeter thereof and including sequentially arranged first, second, third and fourth abutment walls (42a, 42c, 42b, 42d) transverse to the lower surface (24), wherein:
in a cross-section taken in a first horizontal plane (PH1) perpendicular to the insert axis (A1) and intersecting the envelope surface (43), the first, second, third and fourth abutment walls (42a, 42b, 42c, 42d) define an imaginary quadrilateral (QI) through which the insert axis (A1) passes;
the imaginary quadrilateral (QI) lacks rotational symmetry about the insert axis (A1);
in the cross-section taken in the first horizontal plane (PH1), the through bore (28) is entirely located inside the imaginary quadrilateral (QI);
and
the first and second upper cutting edges (32, 34) lack rotational symmetry about the insert axis (A1).

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 16/708,826Filed 10 Dec 2019
Published: US 2021/0170504 A110 Jun 2021
Granted: 24 Aug 2021
Term ends: Not estimatedThe source records don’t support an estimate.

Classification5 codes

B23C 5/1045
With one or more removable cutting inserts: having a cutting insert, the cutting edge of which subtends substantially 90 degrees
B23C 5/2213
For plate-like cutting inserts: having a special shape
B23C 2200/161
Supporting or bottom surfaces: with projections
B23C 2210/168
Fixation of inserts or cutting bits in the tool: seats for cutting inserts, supports for replacable cutting bits