Title of Invention

A TANGENTIAL CUTTING INSERT ADAPTABLE IN A MILLING CUTTER

Abstract A tangential milling coning insert (10) having two idenoenl opposing end surfaces (12) with two identical opposing major side surfaces (18) of a geoerally parallelogrammnatic shape and two identical opposing minor wide surraces (16) extending between them. Each end surface (12) has a periphcral edge (40) contaicting cuttin edges. (52) ond four cornes of which two diagortally opprosed tomers are Jowered (24) and the other two are raised (26) Each end surface is provided with an abutment (28) member having an ataurment surfnce In each cross section of she cutting insert inken in a planc partical to a menor plane of the cutting insert. The abutmcnt surfuce (30) is cheser 1n the median plene than a respective leading secution of a major cutting edge (54).
Full Text

WO 2004/5083 PCT/IL2003/000737
TANGENTIAL CUTTING INSERT AND MILLING CUTTER
FIELD OF THE INVENTION
The present invention relates to a tangential indexable cutting insert
and a milling outter for use in metal cutting processes in general and for milling a
square shoulder in a workpiece in particular,
5
BACKGROUND OF THE INVENTION
Tangential cutting inserts, also known as on-edge, or. jay down,
cutting inserts, are eriented in an insert holder in such a manner that during a
cutting oparation on a workpiece the cutting forces are directed along a major
10 (thicker) dimension of the cutting insert. An advantage of such an attangement
being that the cutting insert can withstand greater tutting forces than when
Oriented in such, a manner that the cutting forces are directed along a minor
(thinner) dimension of the cutting insert.
There is disclosed in EP 0 769 341 a face milling cutter employing a
15 double-sided indexable tangential cutting insert, having a prismoidal shape with
two opposed generally rectangular rake surfaces connected by side surfaces. The
cutting insert has a basic "aegative" geometry and therefore in order to provide
the necessary clearance between the cutting insert and the workpiece when
mounted in a foce-mill, the catting insert is orienied with a negative axial rake

WO 2004/5083 PCT/IL2003/000737
angle. However negative axial rake angles arc disadvantageous, e.g., they have
been found to be deficient in cutting efficiency for applications involving
difficult to machine materiels.
A double-sided indexable tangential cutting insert for a baring too]
5 head is disclosed in US 5,333,972. The insert is provided at each end with a
protruding flat island, Each long cutting edge is inclined at an angle of 3°
relative to the protruding flat island, defining an 'insert axial rake angle".
Rearward of each cutting edge is a descending land surface that merges "with an
increasing incident angle surface to form a chip breaker groove. Each increasing
10 incident angle surface extends from its associated descending land surface to an
adjacent island, at either the top or the bottom of the cutting insert. The cutting
insert is left or right handed It is manufactured to be right-handed and, when
flipped around, is left-handed. It will be appreciated that the magnitude of the
insert axial rake angle is limited for practical reasons. Any increase in the insert
15 axial rake angle will result in an increase in the " vertical" extent of the increasing
incident angle surface (see Fig. 3 of US 5,333,972) that will have an adverse
effect on chip development and evacuation.
There is disclosed in WO 96/35536 a double-sided indexable
tangential, cutting insert which when mounted in a face-mill has a positive axial
20 take angle, even when the necessary clearance between the cutting insert and the
wotkpieoe is provided. This cutting insert presents two peripheral cutting edges
for a right-hand face mill and two peripheral cutting edges for a left-hand face
mill In a side view (see Fig. 9) the cutting insert is generally Thomboidal in
shape. The main cutting edges 10 of each end surface are parallel (see also Figs-
25 7 and 8) to each other and to a centrally located protruding abutment member 12.
The cutting insert is retained in an insert pocket with the abutment member of a
non-operative end surface and an adjacent non-operative relief surface in
abutment with respective support surfaces of the insert pocket The abutment
member of the non-operative end surface and the adjacent non-operative relief

WO 2004/5083 PCT/IL2003/000737
surface merge at an acute-angled mounting corner, In order to change the axial
rake angle of the operative cutting edge, either the insert pocket has to be rotated,
or a cutting insert having a mounting corner with, a different mounting angle has
to be used. In either case, a different milling cutter has to be used. Moreover,
5 the axial rake and relief angles are interdependent and any change in the axial
relief angle results in a corresponding change in the relief angler, which is not
always desirable.
It is an object of the preseat inverriioc to provide a doubls-sided
indexable tangential cutting insert first substantially overcomes- the above
10 mantined problems,
It is a further object of the present invention to provide a, double-sided
indexable tangential tutting insert having four main cutting edges, for a given
direction of rotation of the milling cutter, each main cutting edge having a
positive axial rake angle when mounted as an operative cutting edge in a milling
15 cutter.
It is yet a further object of the present invention to provide a double-
sided indexable tangential cutting insert capable of milling a square shoulder in a
workpiece.
20 SUMMARY OF THE INVENTION
In accordance with the present invention there is provided a tangential
curting insert, for use in a milling ouller, comprising:
two idenlical opposing end surfaces of a generally rectaugular shspe in an
end view of the cutting insert;
25 a periphoral side surface extending between the two opposing end surfaces,
the peripheral side surface comprising two identical opposing major side surfaces
of a genferally parallelogrammatic shape, two opposing minor side surfaces and
corner side surfaces located between adjacent major and minor side surfaces; and
a peripheral edge formed at the intersection of each end surface and the

WO 2004/5083 PCT/IL2003/000737
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peripheral side surface, two sections of each peripheral edge constituting cutting
edges;
each end surface having four comers, two diagonally opposed lowered,
comers and two diagonally opposed raised comers, the lowered corners being
5 closer to a median plans of the cutting insert than the raised comers;
each cutting edge comprising a major outting edge formed by the
intersection of a given major side surface with a given end surface;
each end surface being provided with an abutment member having an
abutment surfece;
10 wherein, in each cross section of the cutting insert taken in a plane parallel
to a minor plane of the cutting insert, the abutment surface of a particular end
surface is closer to the median plane than a leading section of one of the major
cutting edgss of the particular end surface.
Typically, the leading section of each major nutting edge extends from
15 adjacent a respective raised comer to at least the minor plane.
Preferably, each cutting edge further comprises a minor cutting edge
and a corner cutting edge formed, respectively, by the intersection of minor and
corner side surfaces with either end surface.
Further preferably, the two end surfaces have 180o rotational
20 symmetry about a first axis passing therethrough.
Yet further preferably, the major side surfaces have 180o rotational
symmetry about a second axis passing therethrough, the second axis being
perpendicular to the first axis.
Yet further preferably, the two minor side surfaces have 180o
25 rotational symmetry about a third axis passing therethrough, the third axis being
perpendicular to the first axis and the second axis.
If desired, each miner side surface is divided into two minor side sub-
surfaces by a major plane along a join where the major plane intersects the minor
side surface, each minor side sub-surface extenditig away from the join at an

WO 2004/5083 PCT/IL2003/000737
-5-
angle a with respect to a plane passing through the join and parallel to the minor
plane.
Generally, the angle a is in the range of one to two degrees.
In accordance with, the present invention, in an end-view of the cutting
5 insert the abutment surface is elongated in form having two long edges extending
between two short edges.
Preferably, the two short edges are substantially parallel.
Further preferably, a larger portion of one of the two short edges is
located on one side of the major plane and a larger portion of the other one of the
10 two short edges is located on the opposite side of the major plane.
There is also provided in accordance with the present invention, a
milling cutter comprising:
at least one cutting insert in accordance with the present invention; and
a cutter body having at icast one insert pocket in which the at least one
15 cutting insert is retained, the at least one insert packet comprising adjacent side
and rear walls generally transverse to a base, the rear wall being generally convex;
the side wall being provided with an axial location surface that abuts a given minor
side surface of the at least one cutting insert at a given axial abutment region; the
rear wall being provided with two protruding tangential location surfaces, located
20 on either side of a central region of the rear wall, a first of the two tangential
location surfaces abuts a first tangential abutment surface located on the abutment
surface of the at least one cutting insert, a second of the two tangential location
surfaces abuts a second tangerntial abutment surface located on the abutment
surface.
25 In accordance with the present invention, the given axial abutment
region is located on a forward region of a radially outer minor side sub-surface of
the given minor side surface, the forward region being distal the rear wall of the
insert pocket.
Further in accordance with the present invention, the first and second

WO 2004/5083 PCT/IL2003/000737
- 6 -
tangential abutment surfaces arc located on opposite sides of the minor plane.
BRIEF DESCRIPTION OF THE DRAWINGS
For a better understanding, the invention will now be described, by
5 way of example only, with reference to the accompanying drawings in which:
Fig, 1 is a perspective view of a cutting insert in accordance with the present
invention;
Fig. 2 is a first side view of the cutting insert in Fig. 1;
Pig. 3 is an end view of the cutting insert shown in Fig, 1;
10 Fig. 4 is a second side view of the cutting insert shown in Fig. 1;
Fig. 5 is a cross-sectional view of the cutting insert shown in Fig- 1 taken
along V-Vin Fig. 4;
Fig, 6A is a partial cross section of the cutting insert shown in Fig. 1 taken
along VIA-VIA in Fig. 3.
15 Fig. 6B is a partial cross section of the cutting insert shown in Fig. 1 taken
along VIB-VIB in Fig - 3.
Fig. 6C is a partial cross section of the cutting insert shown in Fig- 1 taken
along VIC-VIC in Fig, 3.
Fig- 7 is a perspective view of a milling cutler in accordance with the present
20 invention; and
Fig, 8 is a perspective view of a portion of the cutter body of the milling cutter
in accordance with the present invention, showing in detail an insert pocket.
DETAILED DESCRIPTION OF THE INVENTION
25 Altention is first drawn to Figs. 1 to 5, showing a cutting insert 10 in
accordance with the present invention there. The cutting insert 10 is tangential
and indexable, and is typically manufactured by form-pressing and sintering
carbide powders. The cutting insert 10 is generally rectangular in an end view
and has two identical opposing end surfaces 12. Each end surface 12 has 180°

WO 2004/5083 PCT/IL2003/000737
each outer flat portion 32 of the abutment surface 30, extends from a respective
short edge 38 to the inner flat portion 34, The two short edges 38 are preferably
substantially parallel to each other. As can be seen in Fig: 3, is an end view of
the outting insert 10, a longitudimal axis C of the abutment member 28 makes an
5 acute angle XXX with the major plane P2, so that the two short edges 38 are
substantially located on opposite sides of the major plane P2. In other words, a
larger portion of one of the two short edges 38 is located on one side of the major
plan P2 and a larger portion of the other one of the two short edges 38 is located
on the opposite side of the major plane.
10 A peripheral edge 40 is formed at the intersection of each end surface
12 and the peripheral side surface 14, For each end surface 12, the peripheral
edge 40 comprises two major edges 42, formed by the intersection of the major
side surfaces 18 with the end surface 12; two minor edges 44, formed by the
inlersection of the minor side surfaces 16 with the end surface 12; and two corner
15 edges 42, formed by the intersection of the corner side surfaces 72 with the end
surface 12.
In. the cutting insert 10 of the present invention at least two sections of'
each peripheral edge 40 constitute cutting edges 52. Each cutting edge 52
comprises a major cutting edge 54, extending from a respective raised comer .24
20 along substantially the whole length of its associated major edge 42; a minor
cutting edge 56, extending along at least half of the length of its associated minor
edge 44; and a corner cutting edge 58, associated with a raised comer 24 and at
which the major and minor cutting edges 54, 56 merge. Adjacent each cutting
edge 52 in the end surfaces 12 is a rake surface 60 along which chips, removed
25 from a workpiece during a milling isperstion, flow. A leading section 54' of each
major cutting edge 54 extends from adjacent a respective raised corner 24 to at
least the minor plane p1 and a trailing section 54" extends from the leading
section 54' to a respective lowered corner 26. Between the rake surface 60
adjacent the trailing section 54" and the abutment member 28 there is a chip

WO 2004/5083 PCT/IL2003/000737
-9-
groove 62, The portion of the abutment member 28 adjacent the chip forming
groove 62 constitutes a chip deflector 64.
Referring to Fig. 2, it is seen that each minor side-surface 16 is divided
into two minor side sub-surfaces 70 by a join 72 where the major plane P2
5 intersects the minor side surface 16. Each minor side sub-surface 70 extends
away from the join 72 at an acute angle a with respect to a plane P3 passing
through the join 72 and parallel to the minor plane P1. In accordance with a
specific application this angle is approximately 1.5o. The cutting insert is
provided with a through bore 74 extending between the major side surfaces 18
10 and having a bore axis B coinciding with the second axis A2.
As can be seen in Figs. 6A to 6C, in each cross section of the cutting
insert taken in a plane parallel to the minor plane P1 of the catting insert 10, the
abutment surface 30 of a particular end surface 12 is closer to the median plane
M than a leading section 54' of one of the major cutting edges 54 of the
15 particular end surface 12. Fox example in the cross section shown in Fig. 6A,
the leading section 54' of the major cutting edge 54 to the left of the figure, is
located at a distance D1 from the median plane M, whereas, the respective
abutment surface 30 is located at a distance d1, where D1 is greater than d1.
Similarly, in the cross section shown, in Fig. 6B, the leading section 54' of the
20 major cutting edge 54 is located at a distance D2 from the median plane M,
whereas, the abutment surface 30 is located at a distance d2, where D2 is greater
thsm d2. Similarly, in the cross section shown in Fig, 6C, taken at ttut location of
the minor plane P1, the leading section 54' of the major cutting edge 54 is
located at a distance D3 from the median plane M, whereas, the abutment surface
25 30 is legated at a distance d3, where D3 is greater than d3. In other words, the
abutment memher 28 in the region of the leading section 54' of major cutting
edge 54 and up to, and a little beyond the minor plane P1 (as can be seen in Fig.
4), does not protrude above the major cutting edge 54. As a consequence, chips
cut from a workplace in the region leading section 54' of the major cutting edge

WO 2004/5083 PCT/IL2003/000737
-12-
surfaces 70 are ground. With these surfaces ground, good positioning of the
cutting insert 10 in the insert pocket 84 is ensured
Although the present invention has been described to a certain degree
of particularity, it should be understood that various alteiatioms and modifications
5 could be made without departing from the spirit or scope of the invention as
bereinaftet claimed.

WO 2004/050283 PCT/IL2003/000737
-15-
and a larger portion of the other one of the two short edges (38) is located on the
opposite side of the major place P2.
12. A milling cutter (80) comprising:
at least one cutting insert (10) in accordance with any one of claims 1 to 11;
5 and
a cutter body (82) having at least one insert pocket (84) in which the at least
one cutting insert (10) is retained, the at least one insert pocket (84) comprising
adjacent side and rear walls (88, 90) generally transverse to a base (92), the rear
wall (90) being generally convex; the side wall (88) beiog. provided with an axial
10 location surface (94) that abuts a given minor side surface (16) of the at least one
cutting insert (10) at a given axial abutment region (96); the rear wall (90) being
provided with two protruding tangential location surfaces (98, 100), located on
either side of a central region (102) of the rear wall (90), a first of the two tangential
location surfaces (98- 100) abuis a first tangential abutment surface located on the
15 abutraonl surface (30) of the at least one cutting insert (10), a second of the two
tangential location surfaces (98, 100) abuts a second tangential abutment surface
located on the abutment surface (30).
13. The milling cutter (80) according to claim 12, wherein the given axial
abutment region (96) is located on a forward region (108) of a radially outer minor
20 side sub-surface (110) of the given minor side surface (16), the forward region
(108) being distal the rear wall (90) of the insert pocket (84).
14. The milling cutter (80) according ro claim 12. wherein the first and
second tangential abutment surfaces (104, 106) are located on opposite sides of the
minor plane P1.
Dated this 2nd of June 2005

A tangential
milling coning insert (10)
having two idenoenl opposing
end surfaces (12) with two
identical opposing major side
surfaces (18) of a geoerally
parallelogrammnatic shape and
two identical opposing minor
wide surraces (16) extending
between them. Each end surface
(12) has a periphcral edge (40)
contaicting cuttin edges. (52)
ond four cornes of which two
diagortally opprosed tomers are
Jowered (24) and the other two
are raised (26) Each end surface
is provided with an abutment
(28) member having an ataurment
surfnce In each cross section
of she cutting insert inken in a
planc partical to a menor plane of
the cutting insert. The abutmcnt
surfuce (30) is cheser 1n the
median plene than a respective
leading secution of a major cutting
edge (54).

Documents:

01050-kolnp-2005-abstract.pdf

01050-kolnp-2005-description provisional.pdf

01050-kolnp-2005-drawings.pdf

01050-kolnp-2005-form 1.pdf

01050-kolnp-2005-form 2.pdf

01050-kolnp-2005-form 3.pdf

01050-kolnp-2005-form 5.pdf

01050-kolnp-2005-international publication.pdf

1050-KOLNP-2005-ABSTRACT.pdf

1050-KOLNP-2005-CANCELLED PAGES.pdf

1050-KOLNP-2005-CLAIMS.pdf

1050-KOLNP-2005-CORRESPONDENCE 1.1.pdf

1050-KOLNP-2005-CORRESPONDENCE-1.2.pdf

1050-kolnp-2005-CORRESPONDENCE.pdf

1050-KOLNP-2005-DESCRIPTION (COMPLETE).pdf

1050-KOLNP-2005-DRAWINGS.pdf

1050-KOLNP-2005-FORM 1.pdf

1050-KOLNP-2005-FORM 13.pdf

1050-KOLNP-2005-FORM 2.pdf

1050-KOLNP-2005-FORM 3.pdf

1050-KOLNP-2005-FORM 5.pdf

1050-kolnp-2005-FORM 6.pdf

1050-KOLNP-2005-FORM-27-1.pdf

1050-KOLNP-2005-FORM-27.pdf

1050-kolnp-2005-others 1.2.pdf

1050-KOLNP-2005-OTHERS-1.1.pdf

1050-KOLNP-2005-OTHERS.pdf

1050-KOLNP-2005-PCT PRIORITY DOCUMENT NOTIFICATION.pdf

1050-KOLNP-2005-PETITION UNDER RULE 137.pdf

1050-KOLNP-2005-REPLY TO EXAMINATION REPORT.pdf

abstract-01050-kolnp-2005.jpg


Patent Number 240315
Indian Patent Application Number 1050/KOLNP/2005
PG Journal Number 19/2010
Publication Date 07-May-2010
Grant Date 04-May-2010
Date of Filing 02-Jun-2005
Name of Patentee ISCAR LTD
Applicant Address P.O.BOX 11, Tefen 24959
Inventors:
# Inventor's Name Inventor's Address
1 DAGAN, DANNY 100/8 HERTZEL STREET, 22445, NAHRIYA, ISRAEL.
2 SATRAN, AMIR 6 MORAN STREET, 25147 KFAR VRADIM, ISRAEL.
PCT International Classification Number B23C 5/22
PCT International Application Number PCT/IL2003/000757
PCT International Filing date 2003-09-22
PCT Conventions:
# PCT Application Number Date of Convention Priority Country
1 153252 2002-12-04 Israel