US 11,583,942 B2Granted

Reversible square-shaped cutting insert and rotary cutting tool

AssigneeIscar, Ltd.

InventorsAlexander Passov, Alexander Bronshteyn

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Abstract

In a cutting tool rotatable about a tool axis, a reversible cutting insert is removably secured in a tool body. The cutting insert has opposing top and bottom end surfaces interconnected by a peripheral surface, and a median plane located therebetween. The peripheral surface includes four side surfaces alternating with four corner surfaces, the side and corner surfaces intersecting the top surface to form top major cutting edges and top corner cutting edges, respectively. Each side surface has a median surface and a top major relief surface. Each top major relief surface forms an acute internal top major relief angle with the median plane, and the median plane intersects the four median surfaces to define an imaginary median square. In a top end view of the cutting insert, the four top major cutting edges define an imaginary top major square rotationally offset from the imaginary median square.

A reversible cutting insert (20), comprising:

opposing top and bottom end surfaces (22, 122) interconnected by a continuous peripheral surface (24), with a median plane (M) located between the top and bottom end surfaces (22, 122) and intersecting the peripheral surface (24) to form an insert boundary line (LB), and an insert axis (AI) perpendicular to the median plane (M) about which the cutting insert (20) is indexable,
the peripheral surface (24) including four side surfaces (26) circumferentially alternating with four corner surfaces (28),
the side and corner surfaces (26, 28) intersecting the top end surface (22) at top side and top corner edges (32, 34), respectively, with each top side edge (32) having a top major cutting edge (36), and each top corner edge (34) having a top corner cutting edge (38), and
each side surface (26) including a median surface (46), and a top major relief surface (48) adjacent the respective top major cutting edge (36),
wherein:
in a cross-sectional view taken along one of the top major cutting edges (36), the respective top major relief surface (48) forms an acute internal top major relief angle ((31) with the median plane (M), and
the median plane (M) intersects the four median surfaces (46) to define an imaginary median square (SM) having an imaginary inscribed median circle (CM) with a median diameter (DM) and a center coincident with the insert axis (AI),
wherein, in a top end view of the cutting insert (20):
the four top major cutting edges (36) define an imaginary top major square (SJ) having an imaginary inscribed top major circle (CJ) with a top major diameter (DJ) and a center coincident with the insert axis (AI), and
the imaginary top major square (SJ) is rotationally offset from the imaginary median square (SM) about the insert axis (AI):
and
wherein in an end view of the cutting insert (20), no portion of the cutting insert (20) extends outside the insert boundary line (LB).

9 more elements

Facts

Application

17/392,850Filed 3 Aug 2021 · us provisional application

Priority

19 Oct 2020

Published

US 2022/0118533 A121 Apr 2022

Granted

21 Feb 2023

Term ends

Not estimatedThe source records don’t support an estimate.

Classification12 codes

B23C 5/202
With removable cutter bits or teeth or cutting inserts: plate-like cutting inserts with special form
B23C 5/20
Characterised by physical features other than shape: with removable cutter bits or teeth or cutting inserts
B23C 5/2213
For plate-like cutting inserts: having a special shape
B23C 5/06
Characterised by the shape of the cutter: face-milling cutters, i.e. having only or primarily a substantially flat cutting surface

Abstract

Claims25