Milling insert

Patent metadata

Field	Value
Publication number	US-9475135-B2
Application number	US-201313932396-A
Country	US
Kind code	B2
Filing date	Jul 1, 2013
Priority date	Jul 5, 2012
Publication date	Oct 25, 2016
Grant date	Oct 25, 2016

Abstract

A milling insert having an upper side, an under side, a clearance face disposed between the upper and under side, and at least one cutting edge that includes two main edges, which converge toward a nose edge. The cutting edge is formed between two ground part surfaces situated on both sides of a cutting edge line, by on one hand, a primary clearance surface, which is included in the clearance face and is off-plane from a lower, secondary clearance surface, and, on the other hand, a peripheral chip surface, which is included in the upper side and situated on a higher level than a land disposed inside, and which is narrower than the primary clearance surface and has a width of at least 0.3 mm. The milling insert may advantageously be used in milling tools for gear hobbing.

First claim

The invention claimed is:

1. A milling insert, comprising:
an upper side;
an under side;
a clearance face extending between the upper and under side; and
a cutting edge, which runs along a cutting edge line and is formed in a transition between the upper side and the clearance face, the cutting edge including two main edges that converge toward and meet in a nose edge, the milling insert having a positive cutting geometry formed by a clearance angle between the clearance face and a normal to the upper side, the clearance angle being acute, and wherein the cutting edge is formed between two ground part surfaces situated on both sides of the cutting edge line one of the ground part surfaces being a primary clearance surface included in the clearance face, the primary clearance surface being off-plane and projecting from a secondary clearance surface, and the other ground part surface being a peripheral chip surface included in the upper side and situated on a higher level than a land located inside the peripheral chip surface, the peripheral chip surface being narrower than the primary clearance surface and having a width of at least 0.3 mm.

2. The milling insert according to claim 1 , wherein the width of the primary clearance surface is smaller than the width of the secondary clearance surface.

3. The milling insert according to claim 1 , wherein the width of the chip surface amounts to at most 50% of the width of the primary clearance surface.

4. The milling insert according to claim 1 , wherein the chip surface has a projection area of at most 20% of an entire projection area of the upper side.

5. The milling insert according to claim 1 , wherein the chip surface is planar.

6. The milling insert according to claim 5 , wherein the chip surface is in its entirety situated in a reference plane that defines the upper side of the milling insert.

7. The milling insert according to claim 1 , wherein the underside of the milling insert includes a first, long narrow groove running in the same direction as a longitudinal axis between the two main edges of the cutting edge.

8. The milling insert according to claim 7 , wherein the longitudinal axis is a bisector between the two main edges of the cutting edge.

9. The milling insert according to claim 7 , wherein the underside of the milling insert includes a second groove perpendicular to the first groove.

Assignees

• Sandvik Intellectual Property
• Sandvik Intellectual Property

Inventors

• Wandebäck Gustaf
• Jansson Jörgen

Classifications

• B23C5/202 Primary

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

• B23F21/128

  in exchangeable arrangement · CPC title

• B23F21/226

  in exchangeable arrangement · CPC title

• B23F21/166

  in exchangeable arrangement · CPC title

• B23C2200/126

  stepped · CPC title