Double-sided indexable cutting insert and cutting tool therefor

Patent metadata

Field	Value
Publication number	US-9289836-B2
Application number	US-201414151629-A
Country	US
Kind code	B2
Filing date	Jan 9, 2014
Priority date	Jan 9, 2014
Publication date	Mar 22, 2016
Grant date	Mar 22, 2016

Abstract

A cutting insert having two end surfaces and a peripheral surface, the end surfaces located on opposite sides of a mid-plane, each end surface having three primary apexes and three secondary apexes. Six cutting portions are formed along the intersection of the peripheral surface and the end surfaces. Each cutting portion has a first cutting edge and a second cutting edge extending transversely thereto. A ramping cutting edge extends between the second cutting edge of each cutting portion and the first cutting edge of an adjacent cutting portion. The peripheral surface has a clearance surface extending from each of the second cutting edges towards the mid-plane. The abutment planes of the insert are parallel to the mid-plane. Each of the first cutting edges lies between an adjacent abutment plane and adjacent primary apex.

First claim

What is claimed is:

1. A double sided indexable cutting insert ( 100 ) having a central insert axis (A) extending perpendicular to an insert mid-plane (P), and comprising:
two end surfaces ( 102 ) and a peripheral surface ( 104 ) extending therebetween, the end surfaces ( 102 ) located on opposite sides of the mid-plane (P), each end surface ( 102 ) having three primary apexes ( 106 ) and three secondary apexes ( 108 ); and
six cutting portions ( 110 ), each formed along the intersection of the peripheral surface ( 104 ) and one of the end surfaces ( 102 ), each cutting portion ( 110 ) comprising a first cutting edge ( 112 ) and a second cutting edge ( 114 ) extending transversely to the first cutting edge ( 112 ), and a tip cutting edge ( 116 ) extending therebetween at one of the primary apexes ( 106 );
wherein:
the peripheral surface ( 104 ) has a plurality of clearance surfaces ( 120 ), each extending from one of the second cutting edges ( 114 ) in the direction of the mid-plane (P),
each of the first cutting edges ( 112 ) has a major portion ( 122 ) extending from the respective tip cutting edge ( 116 ) towards the mid-plane (P), and a curved portion ( 124 ) extending from the major portion ( 122 ) and curving away from the mid-plane (P),
each end surface ( 102 ) has an insert abutment surface ( 126 ) on an abutment plane (AP), the abutment planes (AP) being parallel to the mid-plane (P) and equidistant therefrom, and
each of the curved portions ( 124 ) lies between an adjacent abutment plane (AP) and an adjacent primary apex ( 106 ), in a direction parallel to the central insert axis (A).

2. The double sided indexable cutting insert ( 100 ) according to claim 1 , wherein each of the end surfaces ( 102 ) has three abutment recesses ( 128 ), each formed adjacent one of the secondary apexes ( 108 ), between the secondary apex ( 108 ) and the insert axis (A).

3. The double sided indexable cutting insert ( 100 ) according to claim 1 , wherein the peripheral surface ( 104 ) has a plurality of side flanks ( 136 ), each extending between a pair of primary apexes ( 106 ) located on opposite sides of the mid-plane (P), and an adjacent pair of secondary apexes ( 108 ) located on opposite sides of the mid-plane (P), and at each primary apex ( 106 ), each pair of side flanks ( 136 ) forms a first acute angle (α) therebetween.

4. The double sided indexable cutting insert ( 100 ) according to claim 3 , wherein the first acute angle (α) is in the range of 82°-86°.

5. The double sided indexable cutting insert ( 100 ) according to claim 3 , wherein the first acute angle (α) is an 84° angle.

6. The double sided indexable cutting insert ( 100 ) according to claim 3 , wherein the side flanks ( 136 ) are planar and parallel to the insert axis (A).

7. The double sided indexable cutting insert ( 100 ) according to claim 1 , wherein each of the major portions ( 122 ) forms a second acute angle (β) with the mid-plane (P), in a side view of the cutting insert ( 100 ) taken along the mid-plane (P) and along a bisector (B) and viewed from the secondary apex ( 108 ).

8. The double sided indexable cutting insert ( 100 ) according to claim 1 , wherein each cutting portion ( 110 ) further comprises a ramping cutting edge ( 118 ) extending from the second cutting edge ( 114 ) towards the curved portion ( 124 ) of an adjacent cutting portion ( 110 ).

9. The double sided indexable cutting insert ( 100 ) according to claim 8 , wherein the ramping cutting edge ( 118 ) forms a third acute angle (γ) with the mid-plane (P) in a side view of the cutting insert ( 100 ) taken along the mid-plane (P) and along a bisector (B) and viewed from the secondary apex ( 108 ).

10. The double sided indexable cutting insert ( 100 ) according to claim 1 , wherein in each cutting portion ( 110 ), the major portion ( 122 ) of the first cutting edge ( 112 ) is longer than the second cutting edge ( 114 ).

11. The double sided indexable cutting insert ( 100 ) according to claim 1 , further comprising a clamping hole ( 130 ) extending along the insert axis (A), and opening out at least to one of the end surfaces ( 102 ).

12. The double sided indexable cutting insert ( 100 ) according to claim 11 , wherein the clamping hole ( 130 ) opens out to both of the end surfaces ( 102 ).

13. The double sided indexable cutting insert ( 100 ) according to claim 1 , wherein each cutting portion ( 110 ) includes a rake surface ( 132 ) extending along the respective first cutting edge ( 112 ), second cutting edge ( 114 ), and tip cutting edge ( 116 ), obliquely towards the mid-plane (P).

14. The double sided indexable cutting insert ( 100 ) according to claim 13 , wherein each rake surface ( 132 ) also extends along a respective ramping cutting edge ( 118 ) extending from the second cutting edge ( 114 ) towards the curved portion ( 124 ) of an adjacent cutting portion ( 110 ).

15. The double sided indexable cutting insert ( 100 ) according to claim 1 , wherein the peripheral surface ( 104 ) has a plurality of relief surfaces ( 134 ), each extending along one of the cutting portions ( 110 ), from the first cutting edge ( 112 ) and the tip cutting edge ( 116 ) towards the mid-plane (P).

16. The double sided indexable cutting insert ( 100 ) according to claim 1 , wherein in each cutting portion ( 110 ), the major portion ( 122 ) is substantially perpendicular to the second cutting edge ( 114 ).

17. A cutting tool ( 150 ) having a rotation axis (R), and comprising:
a tool body ( 152 ) having a plurality of insert pockets ( 154 ) formed on the periphery thereof arranged symmetrically about the rotation axis (R); and
a plurality of cutting inserts ( 100 ) according to claim 1 , retained in the insert pockets ( 154 ).

18. The cutting tool ( 150 ) according to claim 17 , wherein:
the peripheral surface ( 104 ) of each cutting insert ( 100 ) has a plurality of side flanks ( 136 ), each extending between a pair of primary apexes ( 106 ) located on opposite sides of the mid-plane (P), and an adjacent pair of secondary apexes ( 108 ) located on opposite sides of the mid-plane (P), and
each insert pocket ( 154 ) comprises a pocket abutment surface ( 156 ) for receiving one of the insert abutment surfaces ( 126 ) of the cutting insert ( 100 ), and a plurality of clamping walls ( 158 ) extending transversely to the pocket abutment surface ( 156 ), for receiving the side flanks ( 136 ) of the cutting insert ( 100 ).

19. The cutting tool ( 150 ) according to claim 17 , wherein:
each of the end surfaces ( 102 ) of the cutting insert ( 100 ) has three abutment recesses ( 128 ), each formed adjacent one of the secondary apexes ( 108 ), between the secondary apex ( 108 ) and the insert axis (A), and
each pocket abutment surface ( 156 ) has three spaced apart pocket recesses ( 160 ) formed therein, each pocket recess ( 160 ) at least partially overlapping with one of the abutment recesses ( 128 ).

20. The cutting tool ( 150 ) according to claim 17 , wherein a pocket fastening hole ( 162 ) opens out to a pocket abutment surface ( 156 ) of each insert pocket ( 154 ), and a clamping member ( 164 ) passes through a clamping hole ( 130 ) of the cutting insert ( 100 ) and the fastening hole ( 162 ) of the insert pocket ( 154 ), to fasten the cutting insert ( 100 ) to the insert pocket ( 154 ).

21. The cutting tool ( 150 ) according to claim 17 , wherein a plurality of coolant channels pass through the tool body ( 152 ), each coolant channel opening out at a coolant outlet ( 166 ) towards one

Assignees

• Iscar Ltd

Inventors

• Koifman Alexander
• Passov Alexander
• Bronshteyn Alexander
• Kunitsa Yanina

Classifications

• Y10T407/235

  with integral chip breaker, guide or deflector · CPC title

• Y10T407/23

  including tool having plural alternatively usable cutting edges · CPC title

• B23C2210/084

  Curved cutting edges · CPC title

• B23C2200/123

  curved · CPC title

• Y10T407/192

  with separate means to fasten tool to holder · CPC title