US 2018/0001400 A1Published application

Cutting tool and triangular-shaped indexable cutting insert therefor

AssigneeIscar, Ltd.

InventorYURI MEN

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Abstract

An indexable cutting insert has opposing upper and lower end surfaces, and a peripheral surface including three side surfaces and three corner surfaces. Each corner surface intersects the upper end surface to form an upper cutting edge, and each side surface has a locating surface. The lower end surface has three radially outward facing lower abutment surfaces. The three locating surfaces define a first imaginary triangle having three first bisector planes and three locating planes, and the three lower abutment surfaces define a second imaginary triangle having three second bisector planes. None of the first and second bisector planes are coplanar, and each locating plane intersects two of the upper cutting edges. For each index position of the cutting insert in an insert receiving pocket of a cutting tool, one of the locating surfaces and one of the lower abutment surfaces is in contact with pocket walls thereof.

Claims23

Dependent claims

An indexable triangular-shaped cutting insert (20) comprising:

opposing upper and lower end surfaces (22, 24) with a peripheral surface (26) extending therebetween and a central axis (A1) extending therethrough,
the peripheral surface (26) including three side surfaces (28) circumferentially alternating with three corner surfaces (30), each corner surface (30) intersecting the upper end surface (22) to form an upper cutting edge (32), and each side surface (28) having an inwardly recessed locating surface (34),
the lower end surface (24) having a raised lower support surface (36) and three lower abutment recesses (38) circumferentially spaced around the lower support surface (36), each lower abutment recess (38) including a radially outward facing lower abutment surface (40),
wherein:
in a first cross-section taken in a median plane (M) perpendicular to the central axis (A1) and intersecting the three locating surfaces (34), the three locating surfaces (34) define a first imaginary triangle (T1) having:
three first sides and three first corners,
three first bisector planes (PB1), each first bisector plane (PB1) containing the central axis (A1) and bisecting one of the three first corners, and
three vertical locating planes (PVL), each vertical locating plane (PVL) being perpendicular to the median plane (M) and containing one of the three first sides,
in a second cross-section taken in a horizontal lower plane (PHL) parallel to the median plane (M) and intersecting the three lower abutment surfaces (40), the three lower abutment surfaces (40) define a second imaginary triangle (T2) having:
three second sides and three second corners, and
three second bisector planes (PB2), each second bisector plane (PB2) containing the central axis (A1) and bisecting one of the three second corners,
none of the three second bisector planes (PB2) is coplanar with any of the three first bisector planes (PB1), and
each vertical locating plane (PVL) intersects two of the upper cutting edges (32).

10 more elements

A cutting tool (66), comprising:

a cutting body (68) comprising an insert receiving pocket (70) having a base surface (72) and spaced apart first and second pocket walls (74, 76) transverse to the base surface (72), the first and second pocket walls (74, 76) forming an external pocket angle (δ1) in a front view of the insert receiving pocket (70), and
an indexable triangular-shaped cutting insert (20) removably secured in the insert receiving pocket (70) of the cutting body (68), the cutting insert (20) comprising:
opposing upper and lower end surfaces (22, 24) with a peripheral surface (26) extending therebetween and a central axis (A1) extending therethrough,
the peripheral surface (26) including three side surfaces (28) circumferentially alternating with three corner surfaces (30), each corner surface (30) intersecting the upper end surface (22) to form an upper cutting edge (32), and each side surface (28) having a locating surface (34),
the lower end surface (24) having a raised lower support surface (36) and three lower abutment recesses (38) circumferentially spaced around the lower support surface (36), each lower abutment recess (38) including a radially outward facing lower abutment surface (40), and
in a first cross-section taken in a median plane (M) perpendicular to the central axis (A1) and intersecting the three locating surfaces (34), the three locating surfaces (34) define a first imaginary triangle (T1) having:
three first sides and three first corners,
three first bisector planes (PB1), each first bisector plane (PB1) containing the central axis (A1) and bisecting one of the three first corners, and
three vertical locating planes (PVL), each vertical locating plane (PVL) being perpendicular to the median plane (M) and containing one of the three first sides,
wherein:
the lower support surface (36) makes contact with the base surface (72);
only one of the three locating surfaces (34) is operative, making contact with the first pocket wall (74), and
only one of the three lower abutment surfaces (40) is operative, making contact with the second pocket wall (76).

10 more elements

Dependencies are inferred from the claim text.