CUTTING INSERT AND CUTTING TOOL, AND METHOD FOR PRODUCING CUT WORKPIECES USING CUTTING TOOL

• US 20160082518A1
• Filed: 05/28/2014
• Published: 03/24/2016
• Est. Priority Date: 05/28/2013
• Status: Active Grant

• Current Assignee: Kyocera Corporation
• Original Assignee: Kyocera Corporation
• Inventors: SAKAI, Kouhei
• Granted Patent: US 9,849,514 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: B23B 2200/0447 Parallelogram
• CPC Class Codes: B23B 2200/081 with projections chip breaking projections in general B23B2200/321
• CPC Class Codes: B23B 2200/201 Details of the nose radius and immediately surrounding area
• CPC Class Codes: B23B 27/143 characterised by having chip-breakers

Abstract

A cutting insert of one embodiment is provided with: an insert body having a top surface that has a corner section, a bottom surface, and side surfaces; a cutting edge that is positioned at an intersection between the top surface and the side surfaces, and includes a corner cutting edge, a first cutting edge and a second cutting edge; a rake face that slopes downward away from the cutting edge; and a first raised port that is positioned inside the rake face, and rises upward. The first raised part includes a protruding section that protrudes toward the corner cutting edge. The cutting insert is further provided with a second raised part that extends toward the first cutting edge and the second cutting edge from the protruding section, and has a convex curved shape in which, when viewed from above, the outer peripheral edge on the corner section side.

Claims

1. A cutting insert comprising:

an insert body comprising

a polygonal-shaped top surface including a corner section, and a first side and a second side each adjacent to the corner section,

a polygonal-shaped bottom surface corresponding to the top surface, and

side surfaces positioned between the top surface and the bottom surface;

a cutting edge positioned at an intersection between the top surface and the side surfaces, the cutting edge comprising

a corner cutting edge positioned at the corner section,

a first cutting edge positioned on the first side, and

a second cutting edge positioned on the second side;

a rake face positioned along the cutting edge on the top surface, the rake face sloping downward away from the cutting edge; and

a first raised part positioned inside the rake face on the top surface and rising upward;

wherein

the first raised part comprises a protruding section positioned so as to include a bisecting line of the corner section, protruding toward the corner cutting edge, and having a width in a direction orthogonal to the bisecting line that decreases toward the corner cutting edge when viewed from above; and

the cutting insert further comprises a second raised part positioned on a tip side of the protruding section, extending toward the first cutting edge and the second cutting edge from the protruding section, and having a convex curved shape in which, when viewed from above, an outer peripheral edge on the corner section side forms a protuberance extending toward the corner section.

2. The cutting insert according to claim 1, wherein a width in a direction orthogonal to the bisecting line of the second raised part is greater than a width in a direction orthogonal to the bisecting line of the corner section of the corner cutting edge when viewed from above.

3. The cutting insert according to claim 1, wherein the outer peripheral edge on the corner section side of the second raised part and the corner cutting edge have arc shapes, and a radius of curvature of the outer peripheral edge is greater than a radius of curvature of the corner cutting edge.

4. The cutting insert according to claim 1, wherein the second raised part is positioned on the rake face.

5. The cutting insert according to claim 1, wherein, when a reference plane is provided so as to intersect a central axis that connects a center of the top surface and a center of the bottom surface and to be positioned downward from the top surface,

the second raised part has a height from the reference plane that is constant from a middle portion positioned on the bisecting line to both end portions that extend toward the first cutting edge and the second cutting edge.

6. The cutting insert according to claim 1, wherein, when a reference plane is provided so as to intersect a central axis that connects a center of the top surface and a center of the bottom surface and to be positioned downward from the top surface,

the second raised part has a height from the reference plane of both end portions that extend toward the first cutting edge and the second cutting edge that is greater than a height from the reference plane in the middle portion positioned on the bisecting line.

7. The cutting insert according to claim 1, further comprises a third raised part positioned on the protruding section and connected to the second raised part, the third raised part comprises a section having a width in a direction orthogonal to the bisecting line that decreases toward the corner cutting edge.

8. The cutting insert according to claim 1, wherein a recess portion is formed between both end portions of the second raised part and the first raised part.

9. A cutting tool comprising:

a holder including an insert pocket on a tip side; and

the cutting insert described in claim 1 mounted in the insert pocket so that the cutting edge protrudes from a tip of the holder.

10. A method for producing a cut workpiece, the method comprising the steps of:

rotating a work material;

making the cutting edge of the cutting tool described in claim 9 come into contact with the rotating work material; and

separating the cutting tool from the rotating work material.