High speed milling tool and tangential ramping milling insert therefor

Patent metadata

Field	Value
Publication number	US-9527142-B2
Application number	US-201313770512-A
Country	US
Kind code	B2
Filing date	Feb 19, 2013
Priority date	Feb 19, 2013
Publication date	Dec 27, 2016
Grant date	Dec 27, 2016

Abstract

A single-sided tangential ramping milling insert for high speed milling includes opposite insert seating and top surfaces and a peripheral surface which extends therebetween. The milling insert has a reference plane (P) which passes through the entire peripheral surface, midway between the seating and top surfaces. The peripheral surface includes two opposite side surfaces. Each side surface includes a first cutting edge, a second cutting edge connected to the first cutting edge and extending transversely thereto, a ramping cutting edge connected to the second cutting edge and located opposite the first cutting edge, and a rake surface which extends from at least a portion of the first cutting edge toward the insert seating surface. The milling insert includes two ramping relief surfaces, each of which extends from a ramping cutting edge of one side surface towards the first cutting edge of the opposite side surface.

First claim

What is claimed is:

1. A single-sided tangential ramping milling insert ( 14 ) for high speed milling comprising opposite insert seating and top surfaces ( 20 , 22 ), and a peripheral surface ( 24 ) extending therebetween, the milling insert ( 14 ) having a reference plane (P) passing through the entire peripheral surface ( 24 ), midway between the seating and top surfaces ( 20 , 22 ),
the peripheral surface ( 24 ) comprising two opposite side surfaces ( 26 ) having a first axis (X) passing midway therebetween and lying in the reference plane (P), each side surface ( 26 ) comprising:
a first cutting edge ( 40 ) formed at an intersection of the side surface ( 26 ) and the insert top surface ( 22 ),
a second cutting edge ( 42 ) connected to the first cutting edge ( 40 ) and extending transversely thereto in a direction of the insert seating surface ( 20 ),
a ramping cutting edge ( 44 ) connected to the second cutting edge ( 42 ) and extending further in said direction of the insert seating surface ( 20 ), the ramping cutting edge ( 44 ) and the first cutting edge ( 40 ) being spaced apart from one another in a side view of said each side surface ( 26 ); and
a rake surface ( 38 ) extending from at least a portion of the first cutting edge ( 40 ) towards the insert seating surface ( 20 ),
wherein

the milling insert ( 14 ) has 180° rotational symmetry about a third axis (Z) which is perpendicular to the reference plane (P), but lacks 90° rotational symmetry about said third axis (Z); and
the milling insert ( 14 ) comprises two ramping relief surfaces ( 60 ), each of which extends from the ramping cutting edge ( 44 ) of one side surface ( 26 ) towards the first cutting edge ( 40 ) of the opposite side surface ( 26 ), said one side surface ( 26 ) having 180° rotational symmetry with said opposite side surface ( 26 ) about said third axis (Z).

2. The milling insert ( 14 ) according to claim 1 , wherein each ramping relief surface ( 60 ) extends from a ramping cutting edge ( 44 ) of one side surface ( 26 ) and at least partially meets the rake surface ( 38 ) of the opposite side surface ( 26 ).

3. The milling insert ( 14 ) according to claim 1 , wherein the ramping relief surfaces ( 60 ) are planar.

4. The milling insert ( 14 ) according to claim 1 , wherein at least a portion of the ramping cutting edge ( 44 ) is straight.

5. The according to claim 1 , wherein the ramping cutting edge ( 44 ) comprises a straight first ramping edge ( 56 ) and a second ramping edge ( 58 ) connected transversely thereto; and wherein the second ramping edge ( 58 ) is connected to the second cutting edge ( 42 ).

6. The milling insert ( 14 ) according to claim 5 , wherein the second cutting edge ( 42 ) is raised above the second ramping edge ( 58 ).

7. The milling insert ( 14 ) according to claim 5 , wherein in a plan view of each rake surface ( 38 ), the first ramping edge ( 56 ) forms a ramping edge angle (α) with the reference plane (P).

8. The milling insert ( 14 ) according to claim 7 , wherein the ramping edge angle is between 0° and 45° .

9. The milling insert ( 14 ) according to claim 7 , wherein the ramping edge angle is between 7° and 20° .

10. The milling insert ( 14 ) according to claim 1 , wherein the milling insert ( 14 ) comprises a clamping bore ( 28 ) which opens out to the insert seating and top surfaces ( 20 , 22 ), and said third axis (Z) passes through the clamping bore ( 28 ).

11. The milling insert ( 14 ) according to claim 1 , wherein the first cutting edge ( 40 ) is formed at least at an intersection of the insert top surface ( 22 ) and a respective side surface ( 26 ).

12. The milling insert ( 14 ) according to claim 1 , wherein at least portion of the first cutting edge ( 40 ) is helical.

13. The milling insert ( 14 ) according to claim 1 , wherein the first cutting edge ( 40 ) comprises a main cutting edge ( 52 ) connected to a corner cutting edge ( 54 ).

14. The milling insert ( 14 ) according to claim 1 , wherein at least a portion of the rake surface ( 38 ) extends inwardly.

15. The milling insert ( 14 ) according to claim 1 , wherein the rake surface ( 38 ) comprises an inwardly extending first rake surface ( 46 ) and a second rake surface ( 48 ) which extends transversely therefrom.

16. The milling insert ( 14 ) according to claim 1 , wherein the rake surface ( 38 ) comprises a ramping rake surface ( 50 ) which extends from the ramping cutting edge ( 44 ) towards the insert top surface ( 22 ).

17. The milling insert ( 14 ) according to claim 1 , wherein the milling insert ( 14 ) comprises two insert support surfaces ( 64 ), each of which extends from the insert top surface ( 22 ) towards the insert seating surface ( 20 ).

18. A high speed milling tool ( 10 ) having a rotation axis (R) and comprising:
a tool body ( 12 ) having a pocket ( 16 ), and
the tangential milling insert ( 14 ) according to claim 1 secured in the pocket ( 16 ).

19. The high speed milling tool ( 10 ) according to claim 18 , wherein:
the pocket ( 16 ) comprises a pocket seating surface ( 66 ) oriented tangentially and pocket abutment and support surfaces ( 70 , 72 ) extending transversely to the pocket seating surface ( 66 ), wherein
the insert seating surface ( 20 ) abuts the pocket seating surface ( 66 ),
at least a portion of the rake surface ( 38 ) abuts the pocket abutment surface ( 70 ), and
the insert support surface 64 abuts the pocket support surface ( 72 ).

20. The high speed milling tool ( 10 ) according to claim 19 , wherein:
the milling insert ( 14 ) projects a maximum projection (M) from a tool body end ( 18 ) in the rotation axis (R) direction; and
the maximum projection (M) is larger than a quarter of an insert length (L).

21. The high speed milling tool ( 10 ) according to claim 19 wherein the milling insert ( 14 ) is secured in the pocket ( 16 ) via a screw which passes through an insert clamping bore ( 28 ) and is screw threaded into a threaded pocket bore ( 68 ) which opens out to the pocket seating surface ( 66 ).

22. A single-sided tangential ramping milling insert ( 14 ) for high speed milling comprising:
opposite insert seating and top surfaces ( 20 , 22 );
a peripheral surface ( 24 ) extending between the insert seating and top surfaces ( 20 , 22 ) and comprising two opposite side surfaces ( 26 );
a reference plane (P) passing through the entire peripheral surface ( 24 ) midway between the seating and top surfaces ( 20 , 22 ), the reference plane (P) defined by a first axis (X) passing midway between the side surfaces ( 26 ), and a second axis (Y) passing through the side surfaces ( 26 ) and intersecting the first axis (X);
a clamping bore ( 28 ) which opens out to the insert seating and top surfaces ( 20 , 22 ), the clamping bore ( 28 ) having a third axis (Z) perpendicular to the reference plane (P);
wherein each of said opposite side surfaces ( 26 ) comprises:

a first cutting edge ( 40 ) formed at an intersection of the side surface ( 26 ) and the insert top surface ( 22 );
a second cutting edge ( 42 ) connected to the first cutting edge ( 40 ) and extending transversely thereto in a direction of the insert seating surface ( 20 );
a ramping cutting edge ( 44 ) connected to the second cutting edge ( 42 ); and
a rake surface ( 38 ) extending from at least a portion of the first cutting edge ( 40 ) towards the insert seating surface ( 20 );
wherein

in a side view along the second axis (Y), a main cutting edge portion ( 52 ) of the first

Assignees

• Iscar Ltd

Inventors

• Atar Osama
• Satran Amir

Classifications

• B23C5/109

  with removable cutting inserts · CPC title

• B23C5/202 Primary

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

• B23C2200/208

  Wiper, i.e. an auxiliary cutting edge to improve surface finish · CPC title

• B23C2200/085

  discontinuous · CPC title

• B23C2200/367

  Mounted tangentially, i.e. where the rake face is not the face with largest area · CPC title