WO2011056840A2

WO2011056840A2 - Round cutting insert with anti-rotation feature

Info

Publication number: WO2011056840A2
Application number: PCT/US2010/055247
Authority: WO
Inventors: Lewis Ray Morrison; Kumar Reddy Mylavaram Nikhilesh; Thomas Jerry Long; Jeffrey Francis Kovac; Suresh Mali
Original assignee: Kennametal Inc
Current assignee: Kennametal Inc
Priority date: 2009-11-03
Filing date: 2010-11-03
Publication date: 2011-05-12
Anticipated expiration: 2012-05-03
Also published as: DE112010004250T5; DE112010004250B4; WO2011056840A3; GB2488286A; US8573903B2; GB201209876D0; BR112012009453A2; CN102596465A; CN102596465B; US20110103905A1

Abstract

A round cutting insert (10) with an anti-rotation feature. The round cutting insert (10) includes a plurality of projections (26) formed on a first surface (12) and another plurality of projections (36) formed on an opposing surface (14). The round cutting (10) insert is reversible and indexable. The round cutting insert (10) is removably received in an insert receiving pocket (42) in a tool body (40) wherein the insert receiving pocket (42) includes a plurality of dimples (48) for receiving one of the plurality of first projections (26) or the plurality of second projections (36). This arrangement prevents rotation of the round cutting insert (10) while mounted in the insert receiving pocket (42).

Description

ROUND CUTTING INSERT WITH ANTI-ROTATION FEATURE

|00e.l The invention relates generally to catting inserts and. more particularly, re lates to round cuiting inserts having an. anti-rotation feature for preventing rotation of the round cutting insert mounted onto the body of a cutting tool.

[0002J The inserts used in tools such as, for example, milling cutters are mounted in complementari!y-shaped pockets spaced around the peripher of the too! body. The inserts are typically secured within their respective pockets by clamping screws inserted through a hole provided in the center of the insert. During a cutting operation, such inserts often experience not only compressive and. vibratory forces, but some amount of torque due to the angle between the cutting edge of th inserts and the workpiece. For cutting inserts of non- round shapes, such torque does not result in the rotation, of the insert due io the interference- type fit between the angled sidewaiis of Such inserts and the conipiemen.tarily-shaped walls of the pocket that receive them. By contrast, round inserts can. rotate within their respective pockets since no such mechanical interference naturall arises between the cylindrical or frustfo-cottical. sidewaiis of round inserts and the corresponding circular walls of the pockets which receive them. The resulting rotation can loosen the clamping screw that secures the insert within its respective pocket. If the clamping screw should become sufficiently loosened, it can vibrate within the surrounding pocket severely enough to become chipped or cracked not only ruining the insert, hut also jeopardizing the quality of the cut on the workpiece.

[0003 What is needed is an effective anti -rot tion feature for round cutting inserts which effectively prevents such inserts from rotating without creating local stresses in either the body of the cuiting insert or the pocket that receives it. Therefore, the present invention has been developed in view of the foregoing.

SUMMARY OF THE INVENTION

[0004^'| The present invention provides a round cutting insert with an anti-rotation feature. The round cutting insert includes a plurality of projections formed on a first surface and another plurality of projections formed on an opposing surface. The round cutting insert is reversible and indexable. The round cutting insert is removably received in an insert receiving pocket in a tool body wherein, the insert receiving pocket includes a pluralit of dimples for receiving one of the plurality of fust, projections or the plurality of second projections. This arrangement prevents rotation, of the round cutting insert while mounted in the Insert receiving pocket.

[0005} An aspect of the present invention is t provide a round cutting insert including a first outer surface that terminates generally outwardly in the first cuttm edge and terminates generally inwardly in a. first inner edge, A first inner surface extends generally inwardly from the first inner edge. The insert also includes a plurality of first projections formed adjacent to the first inner edge. A second surface terminates generally outwardly in a second cutting edge and terminates generally inwardly i a second inner edge and a second inner surface extends generally inwardly from the second inner edge. A plurality of second projections is formed, adjacent to the second inner edge. In addition, a generally circular side surface extends between the first outer surface and the second outer surface,

[0006) Another aspect of the present invention is to provide a round cutting insert including a plurality of first projec tions formed on a first surface and a first cutting edge disposed cireumferential!y about the plurality of first projections. The insert also includes a plurality of second projections formed on a second surface that is generally opposed to the first surface. A second cutting edge is disposed cireumferemially about the plurality of second projections.

[0007) A further aspect of the present invention is to provide an anti-rotation mounting arrangement between a round cutting insert and an insert receiving pocket in a too! body,. The round insert includes a first portion that terminates in a first cutting edge, a second portion that terminates in a second cuttmg edge, and a circular side surface between the first portion and the second portion. The anti-rotation mounting arrangement includes a plurality of first projections extending from the first portion, a plurality of second projections extending from the second portion, and a plurality of dimples formed in the insert receiving pocket for cooperating with and receiving one of the plurality of first projections or the plurality of second projections to prevent rotation of the round, cutting insert while mounted in the insert receiving pocket.

[0008) Another aspect of the present invention is to provide a cutting fool assembly having a tool body, an insert, and a -fastening screw. The tool body includes an Insert- receiving pocket. The Insert is received In the insert receiving pocket and the insert has a first portion ha ving a first, cutting edge generally disposed about an outer periphery of the first portion and a second portion having a. second cutting edge generally disposed about, an outer periphery of the second portion. The insert defines a non-cylindrical opening extending, axial!y through the insert from the first portion t the second portion. The fastening screw extends through the non-cylindrical opening to removably secure the insert to the insert receiving pocket of the tool body.

[βΟΘ9| These and other aspects of the present invention will be more fully understood following a revie of this specification and drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 is a perspective view of a culling insert, in accordance wit an aspect of the invention.

[0011 J Figure 2 is a top view of the cutting insert illustrated in Figure 1 , in

accordance with an aspect of the invention.

[0012] Figure 3 is a sectional view taken along, line 3-3 of Figure 2, in accordance with an aspect of the invention.

[0013] Figure 4 is a bottom view of ihe cutting insert illustrated in Figures 1 and 2. in accordance with an aspect of the invention.

[0014] Figure 5 is a side view of the cutting insert illustrated in Figure 1, in

accordance with an aspect of the invention.

[00.15] Figure 6 is an elevational view of a cutting tool assembly, in accordance with an aspect of the invention.

[001.6] Figure 7 is a partial, exploded view of a portion of the cutting tool assembly illustrated in Figure 6, in accordance with an aspect of the invention.

[0017] Figure 8 is an enlarged, partial view of portion of the cutting tool assembly illustrated in Figure 6, .in accordance with an aspect of the invention.

DETAILED DESCRIPTIO

[0018] Referring to the Figures, there is illustrated a. cutting insert 10, in accordance with an aspect of the invention. The cutting insert 10 includes a first or top portion 12 (see generally Figures 1. 2, 3 and 5) and a second or bottom portion 14 (see generally Figures 3, 4 and 5) and a generally circular side portion 16 that extends between the first portion 12 and the second portion 1 . Thus, it will be appreciated that the cutting insert ID is a generally round cutting insert tor positioning in a tool bod for performing a cutting operation on a workplace (not shown) as will be described in more detail herein.

[001 ] As shown in Figures 1 and 2, the cutting- insert 10 includes a first outer surface 18 that terminates in a generally outwardly direction in a first cutting edge 20 and terminates in a generally inwardly direction in a first inner edge 22. In one aspect, the first outer surface 1 S slopes from the first cutting edge 20 toward the firs inner edge 22. The cutting insert 10 also includes a first inner surface 24 that extends in a generally inwardly direction from the first inner edge 22 toward a non-cylindrical opening 23 that extends axially through the cutting insert 10. hi one aspect, the first outer surface 18 may be contained in a plane and the first inner surface 24 may be contained in another plane that is non-parallel to the plane containing the first outer surface 18.

[0020] Still referring to Figures 1 and 2, the cutting insert 10 further includes a plurality of first projections 26. In one aspect, the plurality of first projections 26 are formed, adjacent to the first inner edge 22. In another aspect, the plurality of first projections 26 are formed on the first inner surface 24 to create a raised profile projection, in another aspect, the plurality of first projections 26 are evenly circumferentiaUy spaced about the first inner surface 24. The first cutting edge 20 is circumferentiaUy disposed about the plurality of first projections 26 and in one aspect the plurality of first projections 26 each include a top surface 27 contained in a plane wherein at least a portion of the first cutting edge 20 is contained in a different plane.

[0021] Figure 4 illustrates the second or bottom portion 14 of the cutting insert 10, li will, be appreciated that the second or bottom portion 14 is essentially identical to the first or top portion 12 that is illustrated, for example, in Figures I and 2. More specifically, as illustrated in Figure 4 the second portion 14 of the cutting insert 1 includes a second outer surface 28 that terminates in a generally outwardly direction in a second cutting edge 30 and terminates in a generally inwardly direction in a second inner edge 32. In one aspect, the second outer surface 28 slopes from the second cutting edge 30 toward the second inner edge 32. The second portion 14 of the cutting insert 10 also includes a second inner surface 34 that extends in a generally inwardly direction from the second inner edge 32 toward the opening 23 that extends axially through, the cutting insert 10. hi one aspect, the second outer surface 28 may be contained in a plane and the second inner surface 34 may be contained in another plane that is non-parallel, to the plane containing the second outer surface 28.

[0022] Still referring to Figure 4, the bottom portion 14 of the cutting insert 10 further includes a plurality of second projections 36. In one aspect, the plurality of second projections 36 are formed adjacent to the second inner edge 32. In another aspect, the plurality of second projections 36 are formed on the second inner surface 34 to create a raised profile projection. In another aspect, the plurality of second projections 36 are evenly eireumferentially spaced about the second inner surface 34, The second cutting edge 30 is eireumferentially disposed about the plurality of second projections 36 and in one aspect the plurality of second projections 36 each include a top surface 3? contained in a. plane wherein at least a portion of the second cutting edge 30 is contained in a different plane.

[0023] Referring to Figures 6-8, there is illustrated a cutting too! .assembly wherein a plurality of the cutting inserts 10 are mounted to a tool body 40, More specifically, the cutting inserts 1.0 are removably mounted in an insert receiving pocket 42 of the tool body 40, The insert receiving pocket 42 includes a sidewall 44 and a support surface 46. The generally circular side surface 16 of the cutting inserts 10 are received in the insert recei ving pocket 42 adjacent to sidewall 44. In addition, one of the first portion 12 or second portion 14 of the cutting inserts 10 are received and supported on the support surface 46 of the insert receiving pocket 42. In one aspect of the invention, one of the first inner surface 24 or the second inner surface 34 of the cutting inserts 10 are received and supported on the support surface 4 of the insert receiving pocket 42. More specifically, the support surface 46 includes a plurality of dimples 48 formed therein, .for cooperating with and receiving one of the plurality of first projections 26 or the plurality of second projections 36. In one aspect, the dimples 48 are evenly ci.rcuniferen daily spaced about the surface 46. It will, be appreciated that if the plurality of second projections 36 are received in the plurality of dimples 48 then, the first cutting edge 20 is positioned to perform a cutting operation.

Similarly, if the plurality of first projections 26 are received in the pluralit of dimple^'s 48, then the second cutting edge 30 is positioned for performing a cutting operation.

Accordingly, it will be appreciated thai the cutting insert. 1.0 is reversible and provides for the first cutting edge 20 and the second cuiting edge 30 so as to provide for a longer life of operation for the cutting insert 10.

[00^'24j Still referring to .Figures 6-8, a fastening screw 50 is provided for extending throuah the opening 23 of the cuiting insert 10 and being received in a fastening hole 52 of the insert receiving pocket 42. The fastening screw SO provides for removably securing the insert 10 to the tool body 40 and, more particularly, for removably securing the cutting insert 10 to the insert receiving pocket 42 of the tool body 40,

[0025j As described herein, one of the plurality of first projections 26 or the plurality of second projections 3 is received in the dimples 48 of the insert receiving pocket 42.

Once the fastening screw 5 is positioned to secure the cutting insert 1.0 in the insert

receiving pocket 42, the cooperation between one of the plurality of first projections 26 or the plurality of second projections 36 and the dimples 48. prevents rotation of the insert 10 due to the projections 26 or 36 being received in the corresponding plurality of dimples 48.

Advantageously, the cutting insert 10 is therefore unable to rotate within the insert receiving pocket 42 during a cutting operation and thus providing the anti-rotation aspect of the invention.

[0026J In addition, the plurality of .first projections 26 each include a sidewaH 29 for cooperating with a sidewaH 49 of each, of the plurality of dimples 48. Similarly, the plurality of second projections 36 each include a sidewaH 39 for cooperating with the sidewa!l 49 of each of the plurality of dimples 48. Advantageously, this arrangement, iurJther prevents the cutting insert 1.0 from being unable to rotate within the insert receiving pocket 42.

[0027 j in accordance with another aspect of the invention, the cutting insert 10 is index able for both the first cutting edge 20 and the second cutting edge 30, For example, once a portion of either the first cutting edge 20 or the second cutting edge 30 has been used, then the .fastening screw 50 can be loosened and the cutting insert 10 lifted such that either the first projections 26 or the second projections 36 are removed from the plurality of dimples 48 and then the cutting insert 1.0 can. be turned or rotated and the projections 26 or the projections 36 reinserted into the plurality of dimples 48 followed by the fastening screw 50 being reinserted as well. By providing for the plurality of first projections 26 and the plurality of second projection 36, a user can easily identify how much the cutting insert 10 is rotated during the indexing of the cutting insert 10 as described. It will be appreciated that the first projections 26 are generally opposed to the second projections 3 in order to allow for a user to accurately position the projections 26 or 36 within the dimples 48.

[0028) Referring to Figures ί , 2 and 8, .for example, the opening 23 that extends axially through the cutting insert 10 has a general Sy non-cylindrical shape or configuration, in accordance with, an aspect of the invention. More particularly, the opening 23 adjacent the first portion 12 of the cutting insert includes a plurality of first contact surfaces 54 spaced cireurnferentkily about ihe opening 23. In addition, the opening 23 includes a corresponding ^•plurality of first recesses 56 positioned between the plurality of first contact surfaces 54 to space apart the first contact surfaces 54. It will be appreciated that in accordance with an aspect of the invention, ihe opening 23 adjacent the second portion 14 has essentially the identical structure of a plurality of contact surfaces spaced circumferentially about the opening 23 and spaced apart by a corresponding plurality of recesses.

[00291 As illustrated in Figure 8, when the fastening screw 50 is positioned through the opening 23 of the cutting insert 10, the head of the fastening screw contacts the plurality of first contact surfaces 54, but does not contact the corresponding plurality of first recesses 56.

(0030) Whereas particular embodiments of this invention have been described above for purposes of illustration, it will be evident to those skilled in the art that numerous variations of the details of the present invention may be made without departing .from the invention as defined in the appended claims.

Claims

WHAT IS CLAIMED IS;

1. A round cutting insert UL comprising:

a first outer surface i 8 that tenninates generally outwardly in a first cutting edge 20 and terminates generally inwardly in a first inner edge 22;

a first inner surface 24 extending generally inwardlv from the first inner edge 22;

a plurality of first projections 26 formed adjacent to the first inner edge

?? ^*

a second outer surface 28 that terminates generall outwardly i a second cutting edge 30 and tenninates generally inwardly in a second inner edge 32;

a second inner surface 34 extending generally inwardly from the second inner edge 32;

a plurality of second projections 36 formed adjacent to the second inner edge 32; and

a generally circular side surface 16 that extends between the first outer surface 18 and the second outer surface 28.

2. The round cutting Insert 10 of claim 1 , wherein the plurality of first projections 26 extend onto the first inner surface 24 and wherein the plurality of second projections 36 extend onto the second Inner surface 34.

3. The round cutting insert 10 of claim 2, wherein the plurality of first projections 26 are evenly circumterentiaUy spaced about the first inner surface 24 and wherein the plurality of second projections 36 are evenly eircurafereni ally spaced about the second inner surface 34,

4. The round cutting Insert 10 of claim I , wherein the first cutting edge 20 is circumferential ly disposed about the plurality of first projections 26 and wherein the second cutting edge 30 is clrcumferentialiy disposed about the plurality of second projections 36.

5, The round cutting Insert 10 of claim I , wherein the plurality of first projections 26 are generally opposed to the plurality of second projections 36.

6. The round cutting insert 10 of clai m 1 _s wherein the first ou ter surface

1 slopes from the first cutting edge 20 toward the first inner edge 22 and. wherein the second outer surface 28 lopes from, the second cutting edge 30 toward the second inner edge 32,

7. The round cutting insert 10 of claim I ;

wherein the firs outer surface 18 is contained in a plane and. the first inner surface 24 is contained in another plane that is non-parallel t the plane containing the first outer surface 1 S; and

wherein the second outer surface 28 is contained in a plane and the second inner surface 34 is contained in another plane that is non-parallel, to the plane containing the second outer surface 28,

8. The round cutting insert 10 of claim 1 :

wherein the plurality of first projections 26 each include a top surface 27 contained in a plane and the first cutting edge 20 is contained in a different plane; and wherein the plurality of second projections 36 each include a top surface 37 contained in a plane and the second cutting edge 30 is contained in a different plane.

9. A round cutting insert 1.0 , comprising;

a plurality of first projections 26 formed on a first surface 12;

a first, cutting edge 20 disposed cireumferentially about the plurality of first projections 26;

a plurality of second projections 36 formed on a second surface 14 that, is generally opposed to the first surface 12; and

a second cutting edge 30 disposed circiimfereniially about the plurality of second projections 36,

I.0, The round cutting insert 10 of claim 9, further comprising a generall circular side surface 16 thai extends between the first cutting edge 20 and the second cuiting edge 30.

I I , An anti-rotation mounting arrangemen between a round cutting insert 10 and an insert receiving pocket 42 in a tool, body 40, the round insert 10 including a first portion 12 that terminates in a first cutting edge .20, a second portion 14 that terminates in a - 1.0 - second cutting edge 30, and a circular side surface .16 between the first portion 12 and the second portion 14, comprising:

a pluralit of .first projections 26 extending from. the. first portion 12; a plurality of second projections 36 extending from the second portion

14;

a plurality of dimples 48 formed in the insert receiving pocket 42 for cooperating with and receiving one of the plurality of first projections 26 or the plurality of second projections 36 to prevent rotation of the round cutting 10 insert, while mounted in the insert receiving pocket 42.

12. The ami -rotation mounting mechan ism of claim ! I , wherei n one of the plurality of first projections 26 or the plurality of second projections 36 is removably received in the co.rrespond.ing plurality of dimples 48.

13. The ami -rotation mounting mechanism of claim 1.1. , v herein, the round cutting insert 10 is reversible.

14, The anti-rotation mounting mechanism of claim 1 1 , wherein the round cutting insert 10 is indexable.

1.5. The anti-rotation mounting mechanism of claim 1 1 , wherein the plurality of dimples 48 are evenly eircumferentiaUy spaced about, a pocket surface 46 of the insert receiving pocket 42.

16. A cutting tool assembly, comprising:

a tool body 40 having an insert receiving pocket 42;

an insert 10 that is received in the insert receiving pocket 42, the insert. 10 having a first portion 1.2 having first cutting edge 20 generally disposed, about an outer periphery of the first portion 12 and a second portion 1.4 ha ving a second cutting edge 30 generally disposed about an outer periphery of the second portion. 14, the insert 1.0 defining a non-cylindrical opening 23 extending axially through said insert 10 from the first portion 12 to the second portion 14; and

a fastening screw 50 that extends through the non-cylindrical opening 23 to removably secure the insert 10 to the insert receiving pocket 42 of the tool body 40.

17. The cutting tool assembly of claim Ϊ6, wherein for use of the first cutting edge 20 a first end of the non-cylindrical opening adjacent the first portion 12 includes a plurality of first, contact surfaces 54 spaced eireuiiiferernially thereabout whic are spaced apart by a. corresponding plurality of first recesses 56 such thai a head of the fastening screw 50 contacts the plurality of first contact surfaces 54 to secure the msert 10 to the insert receiving pocket 42 of the tool body 40 but the head does not contact the. plurality of first recesses 56.

18, The cutting tool assembly of claim 17, wherein for use of the second cutting edge 30 a second end of the non-cylindrical opening adjacent, the second port on 14 includes a. plurality of second contact surfaces spaced cireumferentially thereabout which are spaced apart by a corresponding plurality of second recesses such that the head of the fastening screw 50 contacts the plurality of second contact surfaces to secure the Insert 10 to the insert receiving pocket 42 of the tool, body 40 but the head does not contact the plurality of second recesses.

.19. The cutting tool assembly of claim 16, further comprising:

a. plurality of first projections 26 extending from the first portion 12; a plurality of second projections 36 extending from the second portion

14;

a plurality of dimples 48 formed in the insert receiving pocket 42 for cooperating with and receiving one of the plurality of first projections 26 or the plurality of second projections 36 to prevent rotation of the round cutting insert 10 while mounted in the insert recei ving pocket 42.

20 , The cutting tool assembly of claim 1 , wherein one of the plurality of first projections 26 or the plurality of second projections 36 is removably received in the corresponding plurality of dimples 48,