Cutting insert

Patent metadata

Field	Value
Publication number	US-11980952-B2
Application number	US-202017422224-A
Country	US
Kind code	B2
Filing date	Aug 27, 2020
Priority date	Aug 28, 2019
Publication date	May 14, 2024
Grant date	May 14, 2024

Abstract

The present disclosure provides a cutting insert that is economical and can be stably fixed to a tool body. A first edge line ( 10 R) of a cutting insert ( 2 ) is a rectangle having a first side ( 11 ) and a third side ( 13 ) as long sides and a second side ( 12 ) and a fourth side ( 14 ) as short sides. Cutting edges are formed at the first side ( 11 ), the second side ( 12 ) and the third side ( 13 ); on the other hand no cutting edge is formed at the fourth side ( 14 ). At a second edge line ( 20 R) having the same shape as the first edge line ( 10 R), a sixth side ( 22 ) where a cutting edge is formed is opposite to the fourth side ( 14 ), and an eighth side ( 24 ) where a cutting edge is not formed is opposite to the second side ( 12 ). A peripheral side surface ( 30 ) includes a fourth side surface ( 34 ) facing the fourth side ( 14 ) and the sixth side ( 22 ). The fourth side surface ( 34 ) extends from a first end surface ( 10 ) to a second end surface ( 20 ) and is inclined in a direction from the second side ( 12 ) to the fourth side ( 14 ).

First claim

The invention claimed is:

1. A cutting insert having a first end surface, a second end surface opposite to the first end surface, and a peripheral side surface connecting the first end surface and the second end surface, wherein
a first edge line at which the first end surface intersects the peripheral side surface is a rectangle having a first side and a third side as long sides and a second side and a fourth side as short sides; a cutting edge is respectively formed only at the first side, the second side, and the third side of the first edge line; and no cutting edge is formed at the fourth side of the first edge line;
a second edge line at which the second end surface intersects the peripheral side surface is a rectangle having an identical shape to the first edge line; a sixth side where a cutting edge is formed is opposite to the fourth side, and an eighth side where a cutting edge is not formed is opposite to the second side;
the peripheral side surface comprises a fourth side surface facing the fourth side and the sixth side; and
the fourth side surface extends from the first end surface to the second end surface and is inclined in a direction from the second side to the fourth side.

2. The cutting insert according to claim 1 , wherein a pair of two cutting inserts are attached to a tool body to form an end mill capable of drilling;
the two cutting inserts have an identical shape and are interchangeable;
one of the cutting inserts is a center edge in which the first side extends from an outer peripheral surface of the tool body to a rotation axis of the tool body in a state where the fourth side is attached in a direction along the rotation axis;
the other of the cutting inserts is an outer peripheral edge in which the second side is located on an outer peripheral surface opposite to the center edge in a state where the third side is attached in the direction along the rotation axis.

3. The cutting insert according to claim 2 , wherein
in addition to a main cutting edge of the center edge, a wiper cutting edge for smoothing a finished surface of a material cut by the main cutting edge of the outer peripheral edge is also provided at the second side;
the wiper cutting edge of the outer peripheral edge is inclined with respect to the main cutting edge of the center edge.

4. The cutting insert according to claim 2 , wherein
the cutting insert is provided with a mounting hole through which a fastening screw screwed into the tool body passes;
the mounting hole penetrates the first end surface and the second end surface, and a center axis of the mounting hole is inclined with respect to the first end surface and the second end surface.

5. The cutting insert according to claim 2 , wherein
the peripheral side surface comprises a first side surface facing the first side;
when viewed from the first side surface, the main cutting edge of the outer peripheral edge bulges in a direction from the second end surface to the first end surface.

Assignees

• Tungaloy Corp

Inventors

• Yoshida Satoru

Classifications

• B23C5/202

  Plate-like cutting inserts with special form (special form related to securing of the insert B23C5/22) · CPC title

• B23C2200/0494

  Rectangular · CPC title

• B23C5/109 Primary

  with removable cutting inserts · CPC title

• B23C5/20 Primary

  with removable cutter bits or teeth {or cutting inserts} · CPC title

• B23B27/00 Primary

  Tools for turning or boring machines (for drilling machines B23B51/00); Tools of a similar kind in general; Accessories therefor · CPC title