Milling insert

Patent metadata

Field	Value
Publication number	US-10300538-B2
Application number	US-201615350994-A
Country	US
Kind code	B2
Filing date	Nov 14, 2016
Priority date	May 13, 2008
Publication date	May 28, 2019
Grant date	May 28, 2019

Abstract

A milling insert, including an upperside, an underside, and a reference plane parallel thereto. A plurality of indexable cutting edges are formed along a peripheral borderline in transitions between at least the upperside and a number of clearance surfaces. Each cutting edge includes a chip-removing main edge and a surface-wiping secondary edge. The main edge, from a first end of the main edge adjacent to the secondary edge, first declines toward the underside of the milling insert and then, from a lowest part, rises toward an opposite second end of the main edge. The secondary edge is inclined at an angle (ε) in relation to the reference plane as viewed perpendicularly to the clearance surface of the secondary edge, such that a first end of the secondary edge connected to the main edge is situated on a lower level than the opposite, second end of the secondary edge.

First claim

What is claimed is:

1. A face milling insert, comprising:
an upperside, an underside, and a reference plane parallel to the upperside and the underside;
a plurality of indexable cutting edges formed along a peripheral borderline in transitions between at least the upperside and a number of clearance surfaces;
each indexable cutting edge including a chip-removing main edge and a cooperating surface-wiping secondary edge, the cooperating surface-wiping secondary edge forming an obtuse angle with the main edge as viewed in plan view of the upperside; and
the main edge, from a first end of the main edge adjacent to the cooperating surface-wiping secondary edge, first declining toward the underside of the milling insert and then, from a lowest part, rising toward an opposite second end of the main edge, wherein the cooperating surface-wiping secondary edge is inclined at an angle (ε) in relation to the reference plane as viewed perpendicularly to the clearance surface of the cooperating surface-wiping secondary edge, such that a first end of the cooperating surface-wiping secondary edge connected to the main edge is situated on a lower level than the opposite, second end of the cooperating surface-wiping secondary edge, and the first end of the cooperating surface-wiping secondary edge is closer to the main edge than the second end of the cooperating surface-wiping secondary edge.

2. The face milling insert according to claim 1 , wherein the angle (ε) amounts to at least 1°.

3. The face milling insert according to claim 1 , wherein the angle (ε) amounts to at most 7°.

4. The face milling insert according to claim 1 , wherein the angle (ε) amounts to at least 2° and at most 5°.

5. The face milling insert according to claim 1 , wherein the cooperating surface-wiping secondary edge has a convexly arched shape.

6. The face milling insert according to claim 1 , wherein at the second end of each main edge and at the second end of a non-cooperating surface-wiping secondary edge, the borderline is interrupted by non-chip-removing edge lines inside which shoulders are formed having top surfaces, which are located in a common plane parallel to and situated on a higher level than a plane in which the second ends of the non-cooperating surface-wiping secondary edges are commonly situated.

7. The face milling insert according to claim 6 , wherein the top surface of the shoulders is plane.

8. The face milling insert according to claim 6 , wherein the top surface of each of the shoulders extends inward from an outer edge line flush with the clearance surface of the main edge.

9. The face milling insert according to claim 1 , wherein the face milling insert is double-sided.

10. The face milling insert according to claim 1 , wherein a first portion of the main edge closest to the cooperating surface-wiping secondary edge is inclined at a first angle (γ) in relation to the reference plane up to a transition point and wherein a third portion following the transition point forms a second angle relative to the reference plane that is smaller than the first angle, the transition point being situated closer to the cooperating surface-wiping secondary edge than the second end of the main edge.

11. A face milling insert, comprising:
a body having an upperside and an underside, the upperside opposite to the underside and separated therefrom by a plurality of clearance surfaces and a reference plane that is perpendicular to the plurality of clearance surfaces; and
a plurality of indexable cutting edges, each formed along a peripheral borderline at a transition between one of the plurality of clearance surfaces and at least one of the upperside or the underside,
wherein each indexable cutting edge includes
a main edge to remove chips formed during milling of a workpiece, and
a cooperating secondary edge to wipe the surface of the workpiece during milling, the cooperating secondary edge cooperating with the main edge during milling, and each cooperating secondary edge forming an obtuse angle with the main edge as viewed in plan view of the at least one upperside or underside,
wherein each main edge extends from a first end adjacent to the cooperating secondary edge to a second end,
wherein, in a direction along the main edge from the first end toward a point closest to the reference plane, each main edge is angled toward the reference plane,
wherein, in a direction along the main edge from the point closest to the reference plane toward the second end, each main edge is angled away from the reference plane,
wherein the cooperating secondary edge extends from a first end adjacent to the main edge to a second end,
wherein the first end of the cooperating secondary edge is closer to the main edge than the second end of the cooperating secondary edge, and
wherein, in a direction along the cooperating secondary edge from the second end of the cooperating secondary edge to the first end of the cooperating secondary edge, the cooperating secondary edge is inclined toward the reference plane at an angle ε.

12. The face milling insert according to claim 11 , wherein the cooperating secondary edge is convexly arched.

13. The face milling insert according to claim 11 , further comprising:
an inactive edge corresponding to each main edge, the inactive edge interrupting the peripheral borderline between the main edge and a neighboring, non-cooperating secondary edge; and
shoulders formed inside each inactive edge,
wherein the second ends of the cooperating secondary edges define a common plane, and each shoulder has a plane top surface that is parallel to and higher than the common plane.

14. The face milling insert according to claim 13 , wherein the top surface of each shoulder extends inward from an outer edge line flush with the clearance surface.

15. The face milling insert according to claim 11 , wherein the face milling insert has four indexable cutting edges on each of the upperside and the underside, and the cooperating secondary edges are disposed at corners of the milling insert.

16. A face milling insert, comprising:
a body having an upperside and an underside, the upperside opposite to the underside and separated therefrom by a plurality of clearance surfaces and a reference plane that is perpendicular to the plurality of clearance surfaces; and
a plurality of indexable cutting edges, each formed along a peripheral borderline at a transition between one of the plurality of clearance surfaces and at least one of the upperside or the underside,
wherein each indexable cutting edge includes
a main edge to remove chips formed during milling of a workpiece, and
a cooperating secondary edge to wipe the surface of the workpiece during milling, the cooperating secondary edge cooperating with the main edge during milling, and each cooperating secondary edge forming an obtuse angle with the main edge as viewed in plan view of the at least one upperside or underside; and
an inactive edge corresponding to each main edge, the inactive edge separating the main edge from a neighboring, non-cooperating secondary edge,
wherein each main edge extends from a first end adjacent to the cooperating secondary edge to a second end, in a direction along the main edge from the first end toward the second end, the main edge including
a part adjacent to the cooperating secondary edge, which is angled toward the reference plane at an angle γ until a transition point,
a part adjacent to the transition point,
a part between the part adjacent to the transition point and a lowest point of the main edge with respect to the reference plane

Assignees

• Sandvik Intellectual Property

Inventors

• Oprasic Amil
• Widin Leif
• Roman Stefan
• Wihlborg Lennart

Classifications

• B23C2200/082

  with an elevated clamping surface · CPC title

• B23C2200/087

  Operations & Transport · mapped topic

• B23C5/202 Primary

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

• B23C5/207 Primary

  Operations & Transport · mapped topic

• B23C2210/0428

  axial rake angle · CPC title