INDEXABLE INSERT

• US 20090226269A1
• Filed: 03/06/2009
• Published: 09/10/2009
• Est. Priority Date: 03/06/2008
• Status: Active Grant

• Current Assignee: Sumitomo Electric Hardmetal Corp (Sumitomo Corporation)
• Original Assignee: Hokkaido Sumiden Precision Co. Ltd. (Sumitomo Corporation), Sumitomo Electric Hardmetal Corp (Sumitomo Corporation)
• Inventors: TSUDA, Keiichi, IYORI, Hideto, KIMURA, Norihide
• Granted Patent: US 7,976,251 B2
• Time in Patent Office: Days
• US Class Current: 407/114
• CPC Class Codes: B23B 2200/081 with projections chip breaking projections in general B23B2200/321
• CPC Class Codes: B23B 27/143 characterised by having chip-breakers
• CPC Class Codes: Y10T 407/23 including tool having plural alternatively usable cutting edges
• CPC Class Codes: Y10T 407/235 with integral chip breaker, guide or deflector
• CPC Class Codes: Y10T 407/24 with chip breaker, guide or deflector
• CPC Class Codes: Y10T 407/245 comprising concave surface in cutting face of tool

Abstract

An indexable insert has a rake face on which a first ridge (2) and a second ridge (3) are provided. The first ridge (2) protrudes from a boss surface (1) towards a nose, and the second ridge (3) extends continuously from the first ridge (2) to a slope (8) connected to a cutting-edge land (7) of a linear cutting edge (6). The second ridge (3) has a height lower than that of the first ridge (2) and is convex-curved towards a bisecting line (CL) of an apex angle of the nose in plan view, thereby achieving both enhanced chip processability and reduction of load received when raking a chip.

Claims

1. A polygonal indexable insert used for turning, equipped with a nose cutting-edge (5) and a linear cutting edge (6) extending continuously therefrom, the indexable insert comprising:

a rake face;

a first ridge (2) formed on the rake face; and

a second ridge (3) formed on the rake face,

wherein the first ridge (2) protrudes from a boss surface (1) towards a nose, and

wherein the second ridge (3) extends continuously from the first ridge (2) to a slope (8) connected to a cutting-edge land (7) of the linear cutting edge (6), the second ridge (3) having a height lower than that of the first ridge (2) and being convex-curved towards a bisecting line (CL) of an apex angle of the nose in plan view.

2. The indexable insert according to claim 1, wherein the second ridge (3) is disposed symmetrically with respect to the bisecting line (CL) of the apex angle of the nose.

3. The indexable insert according to claim 2, wherein the second ridge (3) comprises two second ridges (3, 3) that are disposed symmetrically with respect to the bisecting line (CL) of the apex angle of the nose,

wherein the indexable insert further comprises a flat breaker base (9) surrounded by the first ridge (2), the two second ridges (3, 3), and the nose cutting-edge (5),

wherein a length of the breaker base (9) in an extending direction of the bisecting line (CL) of the apex angle is set to 30% to 70% of a distance (L) between an apex of the nose and a protruding edge of a top surface of the first ridge (2), and a depth (d) of the breaker base (9) measured from the cutting edge is set within a range between 0.03 mm and 0.15 mm.

4. The indexable insert according to claim 1, wherein the first ridge (2) has a rising surface (2a) defined by a concave-curved slope.

5. The indexable insert according to claim 2, wherein the first ridge (2) has a rising surface (2a) defined by a concave-curved slope.

6. The indexable insert according to claim 3, wherein the first ridge (2) has a rising surface (2a) defined by a concave-curved slope.