US 10,391,567 B2Granted

Rotary cutting tool and cutting insert therefor

AssigneeTaeguTec, Ltd.

InventorsChang Hee Choi, Chang Gyu Park, Su Jin Ryu

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Abstract

A rotary cutting tool for slotting and a cutting insert replaceably mounted to such a rotary cutting tool. The cutting insert is mounted to an insert pocket of a tool body of the rotary cutting tool and is pressed by an elastic pressure portion provided in the tool body. The cutting insert has an upper surface, a lower surface and four peripheral side surfaces. The top and lower surfaces have an inclined surface pressed by the elastic pressure portion. When the cutting insert is mounted to the insert pocket, the inclined surface of the upper surface is pressed by the elastic pressure portion. The inclined surface is inclined with respect to a cross section of the cutting insert such that the lower surface and two peripheral side surfaces of the cutting insert are contacted with the insert pocket by pressure of the elastic pressure portion.

Claims19

Dependent claims

A cutting insert comprising an upper surface, a lower surface, and first to fourth peripheral side surfaces extending between the upper surface and the lower surface,

wherein the cutting insert is replaceably mounted to an insert pocket provided in a tool body of a rotary cutting tool and is pressed by an elastic pressure portion provided in the tool body,
wherein the first and third peripheral side surfaces are opposite to each other and the second and fourth peripheral side surfaces are opposite to each other,
wherein each of the upper surface and the lower surface includes an inclined surface pressed by the elastic pressure portion,
wherein the inclined surface is inclined with respect to a cross section of the cutting insert such that the first peripheral side surface, the second peripheral side surface and the lower surface are contacted with the insert pocket by a pressure of the elastic pressure portion,
wherein when the second peripheral side surface is positioned in a YZ-plane of an XYZ-coordinate system and a vertex, which meets the first peripheral side surface and the lower surface among four vertexes of the second peripheral side surface, is positioned at the origin of the XYZ-coordinate system, the inclined surface is located in a plane defined by three points of an X-axis, a Y-axis and a Z-axis in the XYZ-coordinate system, and
wherein the three points have coordinates of P(x, 0, 0), Q(0, y, 0) and R(0, 0, z), respectively, and x, y and z have a positive value.

3 more elements

A cutting insert comprising an upper surface, a lower surface, and first to fourth peripheral side surfaces extending between the upper surface and the lower surface,

wherein the cutting insert is replaceably mounted to an insert pocket provided in a tool body of a rotary cutting tool and is pressed by an elastic pressure portion provided in the tool body,
wherein the first and third peripheral side surfaces are opposite to each other and the second and fourth peripheral side surfaces are opposite to each other,
wherein each of the upper surface and the lower surface includes an inclined surface pressed by the elastic pressure portion,
wherein the inclined surface is inclined with respect to a cross section of the cutting insert such that the first peripheral side surface, the second peripheral side surface and the lower surface are contacted with the insert pocket by a pressure of the elastic pressure portion,
wherein the upper surface includes first and second protrusion portions which are symmetrically opposite to each other in a direction orthogonal to a central axis passing through centers of the second and fourth peripheral side surfaces,
wherein the lower surface includes third and fourth protrusion portions which are symmetrically opposite to each other in the direction orthogonal to the central axis,
wherein each of the first to fourth protrusion portions includes a protrusion surface and a contact side surface slantly connecting with the protrusion surface, and
wherein the inclined surface is formed at the contact side surface of the first protrusion portion which is located in a radially inward direction of the tool body among the first and second protrusion portions when the cutting insert is mounted to the insert pocket.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 15/529,154Filed 7 Dec 2015
Priority: KR 10-2014-01742195 Dec 2014
Published: US 2017/0368617 A128 Dec 2017
Granted: 27 Aug 2019
Term ends: Not estimatedThe source records don’t support an estimate.

Classification15 codes

B23C 5/2273
For plate-like cutting inserts: having a special shape
B23C 3/305
Milling straight grooves, e.g. keyways: in which more than one milling tool is used simultaneously, e.g. for sheet material
B23C 5/08
Characterised by the shape of the cutter: disc-type cutters
B23C 5/202
With removable cutter bits or teeth or cutting inserts: plate-like cutting inserts with special form