Cutting insert and face milling cutter using the same

Patent metadata

Field	Value
Publication number	US-9616506-B2
Application number	US-201414409832-A
Country	US
Kind code	B2
Filing date	Jan 16, 2014
Priority date	Mar 26, 2013
Publication date	Apr 11, 2017
Grant date	Apr 11, 2017

Abstract

An object is to provide a cutting insert for a milling cutter with which efficiency in machining can be increased. The cutting insert includes two polygonal main surfaces facing each other and side surfaces each connected to a corresponding side of each of the main surfaces. The side surfaces include a major side surface through which an attachment hole extends, a first minor side surface perpendicular to the major side surface, and a second minor side surface disposed between the first minor side surface and the major side surface. A ridge between each of the main surfaces and the major side surface forms a major cutting edge, and a ridge between each of the main surfaces and the second minor side surface forms a minor cutting edge. An angle between the major cutting edge and the minor cutting edge is 145° or larger.

First claim

The invention claimed is:

1. A cutting insert for a milling cutter, the cutting insert comprising two polygonal main surfaces facing each other and a plurality of side surfaces each connected to a corresponding side of each of the main surfaces, the main surfaces being used as rake faces and ridges where the main surfaces and the side surfaces intersect being used as cutting edges,
wherein the plurality of side surfaces include a major side surface through which an attachment hole extends, a first minor side surface perpendicular to the major side surface, and a second minor side surface disposed between the first minor side surface and the major side surface, wherein a ridge where each of the main surfaces and the major side surface intersect forms a major cutting edge, and a ridge where each of the main surfaces and the second minor side surface intersect forms a minor cutting edge, and wherein an angle between the major cutting edge and the minor cutting edge is 145° or larger, and
wherein the major cutting edge has a convex arc shape in view from a direction perpendicular to the major side surface.

2. The cutting insert according to claim 1 , wherein a length of the minor cutting edge is 1 mm or larger.

3. A face milling cutter comprising the cutting insert according to claim 1 attached to a support base that is disposed at a periphery of an end of a cutter body, wherein the sum of an approach angle and an angle between the major cutting edge and the minor cutting edge is less than 180°.

4. A face milling cutter comprising the cutting insert according to claim 2 attached to a support base that is disposed at a periphery of an end of a cutter body, wherein the sum of an approach angle and an angle between the major cutting edge and the minor cutting edge is less than 180°.

5. A cutting insert for a milling cutter, the cutting insert comprising:
two octagonal main surfaces facing each other; and
a plurality of side surfaces each connected to a corresponding side of each of the main surfaces,
wherein the plurality of side surfaces include a major side surface through which an attachment hole extends, a first minor side surface perpendicular to the major side surface, a second minor side surface disposed between the first minor side surface and the major side surface, and the major side surface and the second minor side surface form a parallelogram having two different angles in view from a direction perpendicular to the major side surface,
wherein a ridge where each of the main surfaces and the major side surface intersect forms a major cutting edge, and a ridge where each of the main surfaces and the second minor side surface intersect forms a minor cutting edge, and wherein an angle between the major cutting edge and the minor cutting edge is 145° or larger, and
wherein the major cutting edge and the minor cutting edge form a straight line when viewed in a direction perpendicular to the major side surface.

Assignees

• Sumitomo Electric Hardmetal Corp

Inventors

• Matsubara Kouki
• Maeta Atsuhiko
• Nakakihara Katsuya

Classifications

• Y10T407/192

  with separate means to fasten tool to holder · CPC title

• B23C5/06 Primary

  Face-milling cutters, i.e. having only or primarily a substantially flat cutting surface · CPC title

• B23C2200/208

  Wiper, i.e. an auxiliary cutting edge to improve surface finish · CPC title

• B23C2200/085

  discontinuous · CPC title

• B23C2200/361

  Fixation holes · CPC title