US 10,744,576 B2Granted

Cutting insert for a milling tool and milling tool

AssigneeHartmetall-Werkzeugfabrik Paul Hom GmbH

InventorChristian Stark

Life of this patent

Estimating the term…

Loading patent…

Abstract

A cutting insert for a milling tool, having a first side, a second side which is identical to the first side and a circumferential surface which extends between the first and the second sides, with a bore which extends along a bore axis. The cutting insert is 120° rotationally symmetrical with respect to the bore axis and includes on each of the first side and the second side three identically formed cutting regions, respectively, which are situated at a transition between the first side and the circumferential surface or at a transition between the second side and the circumferential surface, respectively. Each of the in total six cutting regions includes a first rectilinear cutting edge, a second rectilinear cutting edge, and a third arcuate cutting edge, wherein a first end of the first cutting edge is connected to a first end of the third cutting edge, and a first end of the second cutting edge is connected to a second end of the third cutting edge, wherein the first and the second cutting edges are of same length. The cutting insert includes on the first side a first contact surface which extends orthogonally to the bore axis and lies in a first contact plane, and on the second side includes a second contact surface which extends orthogonally to the bore axis and lies in a second contact plane, and wherein each of the first cutting edges are connected at their second ends, which are located opposite the first ends, to one of a total of six arcuate edges, a vertex of which is located between the first and the second contact planes.

Claims12

Dependent claims

A cutting insert for a milling tool, having a first side, a second side which is identical to the first side, a circumferential surface which extends between the first and the second sides, and a bore which extends along a bore axis,

wherein the cutting insert is 120° rotationally symmetrical with respect to the bore axis and comprises six identical cutting regions,
wherein three of said six cutting regions are arranged at a transition between the first side and the circumferential surface, and wherein another three of said six cutting regions are arranged at a transition between the second side and the circumferential surface,
wherein each of the six cutting regions comprises a first rectilinear cutting edge, a second rectilinear cutting edge, and a third arcuate cutting edge, wherein in each of the six cutting regions a first end of the first rectilinear cutting edge is connected to a first end of the third arcuate cutting edge, and a first end of the second rectilinear cutting edge is connected to a second end of the third arcuate cutting edge, and wherein the first and the second rectilinear cutting edges are of same length,
wherein the cutting insert further comprises on the first side a first contact surface which extends orthogonally to the bore axis and lies in a first contact plane, and on the second side comprises a second contact surface which extends orthogonally to the bore axis and lies in a second contact plane,
wherein each of the first rectilinear cutting edges has a second end located opposite the first end of the respective first rectilinear cutting edge, wherein each of the second ends of the first rectilinear cutting edges is connected to one of six arcuate edges,
wherein each of said six arcuate edges has a vertex which is located between the first and the second contact planes, and
wherein an imaginary circle, a center of which lies on the bore axis, is tangent to each of the first and second rectilinear cutting edges arranged on the first side.

4 more elements

A milling tool having:

a cutting insert having a first side, a second side which is identical to the first side, a circumferential surface which extends between the first and the second sides, and a bore which extends along a bore axis, wherein the cutting insert is 120° rotationally symmetrical with respect to the bore axis and comprises six identical cutting regions, wherein three of said six cutting regions are arranged at a transition between the first side and the circumferential surface, and wherein another three of said six cutting regions are arranged at a transition between the second side and the circumferential surface, wherein each of the six cutting regions comprises a first rectilinear cutting edge, a second rectilinear cutting edge, and a third arcuate cutting edge, wherein in each of the six cutting regions a first end of the first rectilinear cutting edge is connected to a first end of the third arcuate cutting edge, and a first end of the second rectilinear cutting edge is connected to a second end of the third arcuate cutting edge, and wherein the first and the second rectilinear cutting edges are of same length, wherein the cutting insert further comprises on the first side a first contact surface which extends orthogonally to the bore axis and lies in a first contact plane, and on the second side comprises a second contact surface which extends orthogonally to the bore axis and lies in a second contact plane, wherein each of the first rectilinear cutting edges has a second end located opposite the first end of the respective first rectilinear cutting edge, wherein each of the second ends of the first rectilinear cutting edges is connected to one of six arcuate edges, wherein each of said six arcuate edges has a vertex which is located between the first and the second contact planes, and wherein an imaginary circle, a center of which lies on the bore axis, is tangent to each of the first and second rectilinear cutting edges arranged on the first side;
a tool holder;
and
a fastening element for fastening the cutting insert to the tool holder.

1 more element

Dependencies are inferred from the claim text.

Facts

Application: 16/196,054Filed 20 Nov 2018 · continuation
Priority: DE 10 2016 109 45223 May 2016
Published: US 2019/0084059 A121 Mar 2019
Granted: 18 Aug 2020
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

B23C 5/109
Shank-type cutters, i.e. with an integral shaft: with removable cutting inserts
B23C 5/205
Plate-like cutting inserts with special form: characterised by chip-breakers of special form
B23C 2200/0411
Hexagonal: irregular
B23C 2200/201
Top or side views of the cutting edge: details of the nose radius and immediately surrounding areas