Round double-sided cutting insert having a peripheral surface provided with protruding indexing latches, insert holder therefor and cutting tool

Patent metadata

Field	Value
Publication number	US-10646927-B2
Application number	US-201815898956-A
Country	US
Kind code	B2
Filing date	Feb 19, 2018
Priority date	Feb 19, 2018
Publication date	May 12, 2020
Grant date	May 12, 2020

Abstract

A round double-sided cutting insert includes an insert peripheral surface that includes a plurality of angularly spaced apart indexing latches protruding therefrom and a plurality of cylindrical insert side abutment surfaces that circumferentially alternate with the plurality of indexing latches. An insert holder has a pocket peripheral surface which includes at least one indexing gap and a plurality of pocket side abutment surfaces that circumferentially alternate with the at least one indexing gap. When the cutting insert is releasably attached to the insert holder, to constitute a fastened position of a cutting tool, each of the plurality of pocket side abutment surfaces abuts a respective insert side abutment surface and each indexing gap has a respective indexing latch located therein.

First claim

What is claimed is:

1. A round indexable cutting insert ( 22 ), having insert central axis (A), the cutting insert ( 22 ) comprising:
opposing insert upper and lower surfaces ( 30 , 32 ) and an insert peripheral surface ( 34 ) extending therebetween, the insert peripheral surface ( 34 ) extending about the insert central axis (A); and
upper and lower cutting edges ( 40 , 42 ) formed at the intersection of the insert peripheral surface ( 34 ) and the insert upper and lower surfaces ( 30 , 32 ), respectively, wherein:
the insert peripheral surface ( 34 ) comprises a plurality of angularly spaced apart indexing latches ( 54 ) protruding radially outwardly therefrom and a plurality of insert side abutment surfaces ( 64 ) that circumferentially alternate with the plurality of indexing latches ( 54 ); and
the plurality of insert side abutment surfaces ( 64 ) lie on an external cylindrical surface (IC) of an imaginary insert cylinder that is co-axial with the cutting insert ( 22 ).

2. The cutting insert ( 22 ), according to claim 1 , wherein the plurality of indexing latches ( 54 ) extend beyond the upper and lower cutting edge ( 40 , 42 ) in the radially outward direction.

3. The cutting insert ( 22 ), according to claim 1 , wherein each of the plurality of angularly spaced apart indexing latches ( 54 ) is convexly shaped in the axial direction.

4. The cutting insert ( 22 ), according to claim 1 , wherein the insert peripheral surface ( 34 ) lies on the external cylindrical surface (IC).

5. The cutting insert ( 22 ), according to claim 1 , wherein the plurality of indexing latches ( 54 ) are spaced apart from the insert upper and lower surfaces ( 30 , 32 ) by an indexing latch distance (D).

6. The cutting insert ( 22 ), according to claim 5 , wherein the indexing latch distance (D) is in the range, 0.3 mm≤D≤0.5 mm.

7. The cutting insert ( 22 ), according to claim 1 , wherein:
the plurality of indexing latches ( 54 ) protrude from the insert peripheral surface ( 34 ) in the radially outward direction by a latch protruding distance (E); and
the latch protruding distance (E) is in the range, 0.2 mm≤D≤0.4 mm.

8. The cutting insert ( 22 ), according to claim 1 , wherein:
each of the plurality of indexing latches ( 54 ) has an angular dimension about the insert central axis (A) defined by a latch angle (a); and
the latch angle (a) is in the range, 11°≤α≤25°.

9. The cutting insert ( 22 ), according to claim 1 , wherein:
the plurality of indexing latches ( 54 ) are angularly spaced apart from one another about the insert central axis (A) by a latch spacing angle (β); and
the latch spacing angle (β) is in the range, 35°≤θ≤49°.

10. The cutting insert ( 22 ), according to claim 1 , wherein:
each of the plurality of indexing latches ( 54 ) has an angular dimension about the insert central axis (A) defined by a latch angle (α);
the plurality of indexing latches ( 54 ) are angularly spaced apart from one another about the insert central axis (A) by a latch spacing angle (β); and
the latch angle (α) is less than the latch spacing angle (β).

11. The cutting insert ( 22 ), according to claim 10 , wherein the latch angle (α) is less than half the latch spacing angle (β).

12. The cutting insert ( 22 ), according to claim 1 , wherein:
each indexing latch ( 54 ) comprises axially opposite latch upper and lower central surfaces ( 60 , 62 ), the latch upper central surface ( 60 ) being closer to the insert upper surface ( 30 ) than the latch lower central surface ( 62 ) and vice versa; and
each of the latch upper and lower central surfaces ( 60 , 62 ) slopes radially inwardly in a direction towards its adjacent one of the insert upper and lower surfaces ( 30 , 32 ).

13. The cutting insert ( 22 ), according to claim 12 , wherein:
the latch upper central surfaces ( 60 ) all lie on an imaginary latch upper cone (CU) that is co-axial with the cutting insert ( 22 ); and
the latch lower central surfaces ( 62 ) all lie on an imaginary latch lower cone (CL) that is co-axial with the cutting insert ( 22 ).

14. The cutting insert ( 22 ), according to claim 13 , wherein:
the plurality of indexing latches ( 54 ) protrude from the insert peripheral surface ( 34 ) in the radially outward direction by a latch protruding distance (E); and
the latch protruding distance (E) is in the range, 0.2 mm≤D≤0.4 mm.

15. The cutting insert ( 22 ), according to claim 13 , wherein:
the latch upper cone (CU) has a latch upper cone aperture ( 2 γ);
the latch lower cone (CL) has a latch lower cone aperture ( 2 θ); and
the latch upper cone aperture ( 2 γ) and the latch lower cone aperture ( 2 θ) are each in the range, 5°≤2γ, 2θ≤20°.

16. The cutting insert ( 22 ), according to claim 1 , wherein the cutting insert ( 22 ) is mirror symmetrical about an insert median plane (M) that is oriented perpendicular to the insert central axis (A) and passes midway between the insert upper and lower surfaces ( 30 , 32 ).

17. The cutting insert ( 22 ), according to claim 1 , wherein the cutting insert ( 22 ) is rotationally symmetrical about the insert central axis (A).

18. The cutting insert ( 22 ), according to claim 1 , wherein the plurality of indexing latches ( 54 ) are identical.

19. The cutting insert ( 22 ), according to claim 1 , wherein the cutting insert ( 22 ) comprises an insert through bore ( 52 ) extending between, and opening out to, the insert upper and lower end surfaces ( 30 , 32 ) along the insert central axis (A).

20. An insert holder ( 24 ) comprising:
a holder main surface ( 66 ) that intersects a holder end surface ( 68 ), and
a holder pocket ( 26 ) recessed in the holder main surface ( 66 ) and opening out to the holder end surface ( 68 ) at a pocket opening ( 70 ), the holder pocket ( 26 ) having a pocket major axis (B) and comprising:
a pocket base surface ( 72 ), and a pocket peripheral surface ( 74 ) oriented substantially perpendicularly thereto and forming a partial boundary thereof, the pocket base surface ( 72 ) being unbounded by the pocket peripheral surface ( 74 ) at the pocket opening ( 70 ) and comprising a pocket support surface ( 76 ); wherein:
the pocket peripheral surface ( 74 ) comprises:
an axially extending internal cylindrical pocket lateral surface ( 80 ) divided into a plurality of angularly spaced apart concave right cylindrical pocket side abutment surfaces ( 88 ) by at least one non-lateral indexing gap ( 85 ) recessed therein, each non-lateral indexing gap ( 85 ) located between a pair of adjacent concave right cylindrical pocket side abutment surfaces ( 88 ).

21. The insert holder ( 24 ), according to claim 20 , wherein the pocket lateral surface ( 80 ) is located on a partially annular pocket raised part ( 82 ) extending circumferentially along, and projecting from, the pocket peripheral surface ( 74 ).

22. The insert holder ( 24 ), according to claim 20 , wherein:
each of the plurality of right cylindrical pocket side abutment surfaces ( 88 ) has an angular dimension about the pocket major axis (B) defined by a pocket side abutment surface angle (μ); and
the pocket side abutment surface angle (μ) is in the range, 34°≤μ≤48°.

23. The insert holder ( 24 ), according to claim 20 , wherein:
each non-lateral indexing gap ( 85 ) has an angular dimension about the pocket major axis (B) defined by a gap angle ( 6 );
each of the plurality of right cylindrical pocket side abutment surfaces ( 88 ) has an angular dimension about the p

Assignees

• Iscar Ltd

Inventors

• Hecht Gil

Classifications

• B23C2210/163

  Indexing · CPC title

• B23B29/043

  with cutting-off, grooving or profile cutting tools, i.e. blade- or disc-like main cutting parts (B23B29/14 takes precedence) · CPC title

• B23B27/1618

  characterised by having chip-breakers · CPC title

• B23B29/12

  Special arrangements on tool holders · CPC title

• B23C2200/045

  Round · CPC title