U.S. patent application number 13/490197 was filed with the patent office on 2013-12-12 for cutting insert and tool having an anti-slip arrangement.
This patent application is currently assigned to Iscar, Ltd.. The applicant listed for this patent is Gil HECHT. Invention is credited to Gil HECHT.
Application Number | 20130330136 13/490197 |
Document ID | / |
Family ID | 48794147 |
Filed Date | 2013-12-12 |
United States Patent
Application |
20130330136 |
Kind Code |
A1 |
HECHT; Gil |
December 12, 2013 |
Cutting Insert and Tool Having an Anti-Slip Arrangement
Abstract
A cutting tool and a cutting insert each include a base surface
and an anti-slip arrangement. Each anti-slip arrangement includes
an actuator surface and non-parallel first and second abutment
surfaces, and the actuator surface of the cutting tool is a surface
of a clamp of the cutting tool. The cutting insert is mounted on
the cutting tool via engagement of the base surfaces thereof and
the clamp is operable to bias the actuator surfaces against each
other and thereby force the first and second abutment surfaces
against each other, for preventing slippage of the cutting insert
along the tool's base surface.
Inventors: |
HECHT; Gil; (Nahariya,
IL) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
HECHT; Gil |
Nahariya |
|
IL |
|
|
Assignee: |
Iscar, Ltd.
Tefen
IL
|
Family ID: |
48794147 |
Appl. No.: |
13/490197 |
Filed: |
June 6, 2012 |
Current U.S.
Class: |
407/113 |
Current CPC
Class: |
B23C 5/2221 20130101;
B23C 2200/161 20130101; Y10T 407/22 20150115; B23C 5/2468 20130101;
B23C 2210/168 20130101; Y10T 407/228 20150115; B23C 5/2465
20130101; Y10T 407/1934 20150115; B23C 5/2269 20130101; Y10T
407/192 20150115; B23C 2270/08 20130101; Y10T 407/1906 20150115;
B23B 2200/161 20130101; Y10T 407/23 20150115 |
Class at
Publication: |
407/113 |
International
Class: |
B23P 15/28 20060101
B23P015/28 |
Claims
1. A cutting insert comprising opposing insert top and base
surfaces which are connected by an insert peripheral surface, at
least one cutting edge, and an insert anti-slip arrangement formed
adjacent to the insert base surface; the insert anti-slip
arrangement comprising first and second insert abutment surfaces
which are non-parallel to each other and to the insert base
surface, and an insert actuator surface having a blunt shape and
lying in an insert actuator surface plane which is oriented
transverse to the insert base surface; wherein pairs of closest
points of the first and second insert abutment surfaces lie within
respective common insert abutment surface planes which are parallel
to the insert actuator surface plane, are a predetermined distance
apart; and at least one of the predetermined distances has a
greater magnitude than another predetermined distance which is
associated with a pair of points further spaced from the insert
actuator surface plane.
2. The cutting insert according to claim 1, wherein, in a bottom
view of the cutting insert, each of the first and second insert
abutment surfaces and the insert actuator surface face outward from
the insert.
3. The cutting insert according to claim 1, wherein each pair of
points of the first and second insert abutment surfaces which are
closer to the insert actuator surface plane than another pair of
points, have a predetermined distance of greater magnitude than the
latter pair of points.
4. The cutting insert according to claim 1, wherein, in a bottom
view of the cutting insert, the first and second insert abutment
surfaces extend at an acute angle to each other.
5. The cutting insert according to claim 1, wherein the first and
second insert abutment surfaces and the insert actuator surface
extend in a direction away from the insert top surface.
6. The cutting insert according to claim 1, wherein the insert
actuator surface and/or the first and second insert abutment
surfaces of the cutting insert are perpendicular to the insert base
surface or are at least partially slanted in a downward-outward
direction.
7. The cutting insert according to claim 1, wherein the insert
actuator surface and the first and second insert abutment surfaces
are formed on a single protuberance.
8. The cutting insert according to claim 1, wherein the insert
actuator surface has a curvature which is only apparent in a
magnified view
9. The cutting insert according to claim 1, further comprising an
insert cutting plane which extends perpendicular to the insert base
surface and an insert longitudinal plane, the insert longitudinal
plane extending longitudinally through the cutting insert and
perpendicular to the insert base surface; wherein, in a bottom view
of the cutting insert, the insert cutting plane theoretically
divides the cutting insert into imaginary first and second insert
halves; wherein, in a bottom view of the cutting insert, the first
and second insert abutment surfaces are at least partially located
at the first insert half and the insert actuator surface is located
at the second insert half.
10. The cutting insert according to claim 1, wherein, in a bottom
view of the cutting insert, the insert anti-slip arrangement is
asymmetric about an insert longitudinal plane.
11. The cutting insert according to claim 1, wherein the insert
base surface extends along the entire insert peripheral
surface.
12. The cutting insert according to claim 1, wherein a first insert
base width of the insert base surface which extends from, and
perpendicular to, the first insert abutment surface, can be greater
than a second insert base width which extends from, and
perpendicular to, the second insert abutment surface.
13. The cutting insert according to claim 1, further comprising an
additional insert anti-slip arrangement.
14. A tool having a cutting direction and comprising: an insert
seating region comprising a tool base surface, tool inner and
peripheral regions located on opposing sides of the insert seating
region, the cutting direction being defined as extending from the
tool inner region towards the tool peripheral region, and a tool
anti-slip arrangement; the tool anti-slip arrangement comprising
first and second tool abutment surfaces formed adjacent to the tool
base surface and being non-parallel to each other and to the tool
base surface, and a clamp located at the tool inner region and
comprising a tool actuator surface lying in a tool actuator surface
plane which is oriented transverse to the tool base surface;
wherein pairs of closest points of the first and second tool
abutment surfaces lie within respective common tool abutment
surface planes which are parallel to the tool actuator surface
plane, are a predetermined distance apart; at least one of the
predetermined distances has a greater magnitude than another
predetermined distance which is associated with a pair of points
further spaced from the tool actuator surface plane; and the clamp
is configured for force application in the cutting direction via
the tool actuator surface.
15. The tool according to claim 14, wherein the tool actuator
surface has a blunt shape.
16. The tool according to claim 14, wherein the force application
is in a direction parallel to the tool base surface.
17. The tool according to claim 14, wherein the clamp and/or tool
is configured for linear motion of the clamp.
18. The tool according to claim 17, wherein the linear motion of
the clamp is in a direction transverse to the cutting
direction.
19. The tool according to claim 14, wherein the tool is formed with
a track which is bounded by an inner wall of the tool, the track
and clamp being configured for continuous contact of the inner wall
and clamp at each position thereof.
20. The tool according to claim 14, wherein each pairs of points of
the first and second tool abutment surfaces which are closer to the
tool actuator surface plane than another pair of points of the
first and second tool abutment surfaces, have a predetermined
distance of greater magnitude than the latter pair of points.
21. The tool according to claim 14, wherein the first and second
tool abutment surfaces and the tool actuator surface are recessed
into the insert seating region.
22. The tool according to claim 14, wherein the first and second
tool abutment surfaces are formed in a single tool recess.
23. The tool according to claim 14, wherein a first tool base width
of the tool base surface which extends from, and perpendicular to,
the first tool abutment surface, can be greater than a second tool
base width which extends from, and perpendicular to, the second
tool abutment surface.
24. A tool assembly comprising in combination a tool configured for
cutting in a cutting direction and a cutting insert mounted to the
tool: the tool comprising an insert seating region comprising a
tool base surface, tool inner and peripheral regions located on
opposing sides of the insert seating region, the cutting direction
being defined as extending from the tool inner region towards the
tool peripheral region, and a tool anti-slip arrangement; the tool
anti-slip arrangement comprising first and second tool abutment
surfaces formed adjacent to the tool base surface and being
non-parallel to each other and to the tool base surface, and a
clamp located at the tool inner region and comprising a tool
actuator surface which is oriented transverse to the insert base
surface; the cutting insert comprising opposing insert top and base
surfaces which are connected by an insert peripheral surface, at
least one cutting edge, and an insert anti-slip arrangement formed
adjacent to the insert base surface the insert anti-slip
arrangement comprising first and second insert abutment surfaces
which are non-parallel to each other and to the insert base
surface, and an insert actuator surface which is oriented
transverse to the insert base surface; wherein: the cutting insert
and the tool are configured for a position in which the insert base
surface contacts the tool base surface; and the clamp is configured
to bias the tool actuator surface against the insert actuator
surface which consequently biases the first and second insert
abutment surfaces against the first and second tool abutment
surfaces for preventing slippage of the cutting insert along the
tool base surface.
25. The tool assembly according to claim 24, wherein the tool
anti-slip arrangement and the insert anti-slip arrangement are
configured to prevent motion of the cutting insert in a plane
parallel with the tool base surface.
26. The tool assembly according to claim 24, wherein the tool
further comprises a biasing arrangement configured to bias the
insert base surface against the tool base surface and the biasing
arrangement is configured to allow slippage of the cutting insert
along the tool base surface.
27. The tool assembly according claim 24, wherein the only surfaces
of the tool which contact a periphery of the cutting insert are the
tool actuator surface and the first and second tool abutment
surfaces.
28. The tool assembly according to claim 24, wherein the only
surfaces of the tool which contact the cutting insert are the tool
actuator surface, the tool base surface and the first and second
tool abutment surfaces.
29. The tool assembly according to claim 24, wherein: pairs of
closest points of the first and second tool abutment surfaces lie
within respective common tool abutment surface planes which are
parallel to a tool actuator surface plane, are a predetermined
distance apart; at least one of the predetermined distances has a
greater magnitude than another predetermined distance which is
associated with a pair of points further spaced from the tool
actuator surface plane; and pairs of closest points of the first
and second insert abutment surfaces lie within respective common
insert abutment surface planes which are parallel to an insert
actuator surface plane, are a predetermined distance apart; and at
least one of the predetermined distances has a greater magnitude
than another predetermined distance which is associated with a pair
of points further spaced from the insert actuator surface
plane.
30. The tool assembly according to claim 24, wherein the tool
actuator surface and the insert actuator surface are both
blunt.
31. The tool assembly according to claim 30, wherein one of the
tool actuator surface and the insert actuator surfaces is flat, and
the other is curved.
32. A method of clamping a cutting insert to a tool: the tool
comprising an insert seating region comprising a tool base surface,
tool inner and peripheral regions located on opposing sides of the
insert seating region, and a tool anti-slip arrangement; the tool
anti-slip arrangement comprising first and second tool abutment
surfaces formed adjacent to the tool base surface and being
non-parallel to each other and to the tool base surface, and a
clamp located at the tool inner region and comprising a tool
actuator surface which is oriented transverse to the tool base
surface; the cutting insert comprising opposing insert top and base
surfaces which are connected by an insert peripheral surface, at
least one cutting edge, and an insert anti-slip arrangement formed
adjacent to the insert base surface; the insert anti-slip
arrangement comprising first and second insert abutment surfaces
which are non-parallel to each other and to the insert base
surface, and an insert actuator surface which is oriented
transverse to the insert base surface; wherein the method
comprises: a. mounting the cutting insert on the tool in a position
in which the insert base surface contacts the tool base surface;
and b. biasing the clamp's tool actuator surface against the insert
actuator surface, thereby biasing the first and second insert
abutment surfaces respectively against the first and second tool
abutment surfaces for preventing slippage of the cutting insert
along the tool base surface.
33. The method of clamping according to claim 32, wherein said
biasing is in a cutting direction defined as extending from the
tool inner region towards the tool peripheral region.
Description
FIELD OF THE INVENTION
[0001] The subject matter of the present application relates to
cutting inserts and tools for holding same, in particular cutting
inserts and tools designed for metal-working machines. More
specifically, the application relates to a construction and/or
method relating to prevention of slippage of a cutting insert
mounted on a tool.
BACKGROUND OF THE INVENTION
[0002] Precise positioning of a cutting insert in a tool can allow
for high precision cutting. However, cutting inserts are often
subjected to high forces during cutting operations which can cause
displacement or change of orientation of the cutting insert in a
tool which hold them.
[0003] U.S. Pat. No. 6,536,996 discloses a cutting tool comprising
a tool body and two cutting inserts mounted therein. An insert
receiving pocket of the tool body has a pocket base wall. An
indentation that opens to the pocket base wall has a lower wall
that is bounded by first, second, third and fourth side walls. The
cutting insert has an insert base wall. A protuberance extends
downwards from the insert base wall and has a lower wall bounded by
first, second, third and fourth lateral walls. The insert base wall
abuts the pocket base wall, the first lateral wall abuts the first
side wall, the third lateral wall abuts the third side wall, the
first lateral wall is distanced from a center line by a first
distance, the cutting edge close to the center line is distanced
therefrom by a second distance where the first distance is at least
three times greater than the second distance and where a relief
surface of the cutting insert is relieved from the insert receiving
pocket.
SUMMARY OF THE INVENTION
[0004] The subject matter of the present invention relates to,
inter alia, an anti-slip arrangement for maintaining a precise
mounted operative position of a cutting insert in a tool.
[0005] Such arrangement may be particularly beneficial for rotating
tools and in particular high-speed rotating tools, which are
subjected to high cutting forces. High-speed tools can be defined
as those which are configured for operation in which a friction
lock is insufficient to withstand centrifugal forces during
rotation. Further elaboration can be found in ISO 15641.
[0006] Such arrangements could also be particularly beneficial for
lateral cutting operations (including, for example, ramp-down
operations), even at lower speeds, in which cutting inserts can
tend to be subjected to high displacement forces.
[0007] In accordance with a first aspect of the subject matter of
the present application, there is provided a method of clamping a
cutting insert to a tool or, stated differently, securing a cutting
insert against slippage in an operative position on a tool.
[0008] The method comprises mounting the cutting insert on the tool
in a position in which an insert base surface contacts a tool base
surface, and biasing a clamp's tool actuator surface against an
insert actuator surface to thereby force non-parallel first and
second insert abutment surfaces respectively against non-parallel
first and second tool abutment surfaces.
[0009] Abutment of the base surfaces and abutment surfaces can be
configured to prevent slippage of the cutting insert along the tool
base surface.
[0010] For the purposes of the specification and claims, slippage
of the cutting insert along the tool base surface can include
rotational and/or translational motion. In preferred embodiments
the slippage could be visible slippage, i.e. there could be
sufficient constructional tolerance of the tool and/or cutting
insert to allow visible relative motion thereof, which could allow
the clamp to suitably position the cutting insert. However, the
slippage could also be non-visible slippage, i.e. extremely small,
such that it is not visible without magnification, but which can
occur during cutting operations.
[0011] More precisely, the method can comprise: the tool comprising
an insert seating region comprising a tool base surface, tool inner
and peripheral regions located on opposing sides of the insert
seating region, and a tool anti-slip arrangement; the tool
anti-slip arrangement comprising first and second tool abutment
surfaces formed adjacent to the tool base surface and being
non-parallel to each other and to the tool base surface, and a
clamp located at the tool inner region and comprising a tool
actuator surface which is oriented transverse to the tool base
surface; the cutting insert comprising opposing insert top and base
surfaces which are connected by an insert peripheral surface, at
least one cutting edge, and an insert anti-slip arrangement formed
adjacent to the insert base surface; the insert anti-slip
arrangement comprising first and second insert abutment surfaces
which are non-parallel to each other and to the insert base
surface, and an insert actuator surface which is oriented
transverse to the insert base surface; wherein the method
comprises: [0012] a. mounting the cutting insert on the tool in a
position in which the insert base surface contacts the tool base
surface; and [0013] b. biasing the clamp's tool actuator surface
against the insert actuator surface, thereby biasing the first and
second insert abutment surfaces respectively against the first and
second tool abutment surfaces for preventing slippage of the
cutting insert along the tool base surface.
[0014] In accordance with another aspect of the subject matter of
the present application, there is provided a tool assembly. The
tool assembly can be configured for application of the methods
detailed in the first aspect. The cutting insert and the tool can
be configured such that the insert base surface contacts the tool
base surface and the clamp is configured to bias the tool actuator
surface against the insert actuator surface. Such biasing can
consequently bias the first and second insert abutment surfaces
against the first and second tool abutment surfaces. This
arrangement can prevent slippage of the cutting insert along the
tool base surface.
[0015] More precisely, the tool assembly can comprise in
combination a tool configured for cutting in a cutting direction
and a cutting insert mounted to the tool: the tool comprising an
insert seating region comprising a tool base surface, tool inner
and peripheral regions located on opposing sides of the insert
seating region, the cutting direction being defined as extending
from the tool inner region towards the tool peripheral region, and
a tool anti-slip arrangement; the tool anti-slip arrangement
comprising first and second tool abutment surfaces formed adjacent
to the tool base surface and being non-parallel to each other and
to the tool base surface, and a clamp located at the tool inner
region and comprising a tool actuator surface which is oriented
transverse to the tool base surface; the cutting insert comprising
opposing insert top and base surfaces which are connected by an
insert peripheral surface, at least one cutting edge, and an insert
anti-slip arrangement formed adjacent to the insert base surface
the insert anti-slip arrangement comprising first and second insert
abutment surfaces which are non-parallel to each other and to the
insert base surface, and an insert actuator surface which is
oriented transverse to the insert base surface; wherein: the
cutting insert and the tool are configured for a position in which
the insert base surface contacts the tool base surface; and the
clamp is configured to bias the tool actuator surface against the
insert actuator surface which consequently biases the first and
second insert abutment surfaces against the first and second tool
abutment surfaces for preventing slippage of the cutting insert
along the tool base surface.
[0016] In accordance with still another aspect of the subject
matter of the present application, there is provided a cutting
insert comprising first and second insert abutment surfaces which
are non-parallel to each other and an insert actuator surface,
which are together configured for positioning of the insert in a
tool. The cutting insert can be configured for use in the tool
assembly or in application of the methods detailed in the previous
aspects. The first and second insert abutment surfaces and the
insert actuator surface can be, in a bottom view of the cutting
insert, in a triangular configuration. The first and second insert
abutment surfaces can partially or along the entire length thereof,
converge towards each other.
[0017] More precisely, the cutting insert can comprise opposing
insert top and base surfaces which are connected by an insert
peripheral surface, at least one cutting edge, and an insert
anti-slip arrangement formed adjacent to the insert base surface;
the insert anti-slip arrangement comprising first and second insert
abutment surfaces which are non-parallel to each other and to the
insert base surface, and an insert actuator surface having a blunt
shape and lying in an insert actuator surface plane which is
oriented transverse to the insert base surface; wherein pairs of
closest points of the first and second insert abutment surfaces lie
within respective common insert abutment surface planes which are
parallel to the insert actuator surface plane, are a predetermined
distance apart; and at least one of the predetermined distances has
a greater magnitude than another predetermined distance which is
associated with a pair of points further spaced from the insert
actuator surface plane.
[0018] In accordance with a further aspect of the subject matter of
the present application, there is provided a cutting insert
comprising opposing insert top and base surfaces which are
connected by an insert peripheral surface, opposing first and
second cutting ends arranged along an insert longitudinal plane
perpendicular to the insert top and base surfaces, a protuberance
surrounded by the insert base surface and spaced apart from the
insert peripheral surface, and first and second insert anti-slip
arrangements formed on the protuberance, each insert anti-slip
arrangement comprising: outwardly facing first and second insert
abutment surfaces which are non-parallel to the insert base
surface, and an outwardly facing insert actuator surface oriented
transverse to the insert base surface, wherein: the first and
second insert abutment surfaces of one insert anti-slip arrangement
converge in a direction towards the insert actuator surface of the
other anti-slip arrangement and also towards an associated cutting
end.
[0019] In accordance with another aspect of the subject matter of
the present application, there is provided a tool comprising first
and second tool abutment surfaces which are non-parallel to each
other and a tool actuator surface, which are configured for
positioning of an insert in a tool. The tool can be configured for
use in the tool assembly or application of the methods detailed in
the previous aspects. The first and second tool abutment surfaces
and the tool actuator surface can be, in a plan view thereof, in a
triangular configuration. The first and second tool abutment
surfaces can partially or along the entire length thereof, converge
towards each other.
[0020] More precisely, the tool can have a cutting direction and
can comprise an insert seating region comprising a tool base
surface, tool inner and peripheral regions located on opposing
sides of the insert seating region, the cutting direction being
defined as extending from the tool inner region towards the tool
peripheral region, and a tool anti-slip arrangement; the tool
anti-slip arrangement comprising first and second tool abutment
surfaces formed adjacent to the tool base surface and being
non-parallel to each other and to the tool base surface, and a
clamp located at the tool inner region and comprising a tool
actuator surface lying in a tool actuator surface plane which is
oriented transverse to the tool base surface; wherein pairs of
closest points of the first and second tool abutment surfaces lie
within respective common tool abutment surface planes which are
parallel to the tool actuator surface plane, are a predetermined
distance apart; at least one of the predetermined distances has a
greater magnitude than another predetermined distance which is
associated with a pair of points further spaced from the tool
actuator surface plane; and the clamp is configured for force
application in the cutting direction via the tool actuator
surface.
[0021] In summary, the cutting insert or tool of the aspects above
can comprise a base surface and an anti-slip arrangement. Each
anti-slip arrangement can comprise an actuator surface and first
and second abutment surfaces. The anti-slip arrangement of the tool
can comprise a clamp. The cutting insert can be mounted on the
cutting tool via engagement of the base surfaces thereof and the
clamp can be operated to bias the actuator surfaces and first and
second abutment surfaces against each other for preventing slippage
of the cutting insert along the tool's base surface.
[0022] It is understood that the above-said is a summary, and that
any of the aspects above may further comprise any of the features
described in connection with any of the other aspects or described
hereinbelow. For example, any of the following features may be
applicable to any of the above-aspects of the present application:
[0023] i. Biasing of the tool actuator surface can be in the
cutting direction. The cutting direction can be defined as
extending from the tool inner region towards the tool peripheral
region. [0024] ii. Biasing of the tool actuator surface can
comprise moving at least a portion of the clamp in a motion
direction transverse to the cutting direction. Moving the clamp can
comprise moving the entire clamp in a motion direction transverse
to the cutting direction. [0025] iii. An internal direction angle
formed between the cutting direction and the motion direction can
be an acute angle. Preferably, the direction angle can be between
30.degree. and 80.degree.. [0026] iv. The cutting insert's at least
one cutting edge can be formed at an intersection of the insert top
surface and the insert peripheral surface. [0027] v. At least a
portion of the insert top surface can be configured as a rake
surface and at least a portion of the insert peripheral surface
adjacent to the rake surface can be configured as a relief surface.
[0028] vi. The cutting insert can comprise a through hole opening
out to the top insert surface and another surface of the cutting
insert. In a bottom view of the cutting insert, the insert actuator
surface can be located on one side of the through hole and the
first and second insert abutment surfaces can be located on an
opposing side of the through hole. [0029] vii. In a bottom view of
the cutting insert, each of the first and second insert abutment
surfaces and the insert actuator surface can face outward from the
insert. [0030] viii. Each pair of points of the first and second
insert abutment surfaces which are closer to the insert actuator
surface plane than another pair of points of the first and second
insert abutment surfaces located further from the insert actuator
surface plane, can have a predetermined distance of greater
magnitude than the latter pair of points. [0031] ix. In a bottom
view of the cutting insert, the first and second insert abutment
surfaces can extend at an angle of less than 180.degree. to each
other. [0032] x. In a bottom view of the cutting insert, the first
and/or second insert abutment surfaces extend in a straight line.
[0033] xi. In a bottom view of the cutting insert, the first and
second insert abutment surfaces can extend at an acute insert
abutment angle to each other. [0034] xii. In a bottom view of the
cutting insert, the first insert abutment surface can be longer
than the second insert abutment surface. [0035] xiii. The first and
second insert abutment surfaces and the insert actuator surface can
extend in a direction away from the insert top surface. [0036] xiv.
The insert actuator surface and/or the first and second insert
abutment surfaces of the cutting insert can be perpendicular to the
insert base surface or at least partially slanted in a
downward-outward direction. Such construction can be beneficial in
prevention of a tool actuator surface propelling the cutting insert
in a direction away from the tool base surface. [0037] xv. The
first and second insert abutment surfaces can be formed on a single
protuberance. The insert actuator surface and the first and second
insert abutment surfaces can be formed on a single protuberance.
Every insert actuator surface and the first and second insert
abutment surfaces of the cutting insert can be formed on a single
protuberance. Every insert actuator surface and the first and
second insert abutment surfaces of the cutting insert can be
connected to form a periphery of, or enclose, a single
protuberance. [0038] xvi. The bluntness of the insert actuator
surface can be for providing a consistent or controlled force
application direction. The insert actuator surface can have a
curvature which does not extend along, or is free of, portions
which are tangential to surfaces connected to the insert actuator
surface. The insert actuator surface can be convexly curved. The
insert actuator surface can have a curvature which is only apparent
in a magnified view (i.e. to the naked eye the insert actuator
surface appears flat, yet using any magnification means, a
magnifying glass, etc., curvature is viewable). [0039] xvii. In a
bottom view of the cutting insert, the insert actuator surface can
follow a straight line. The blunt shape of the insert actuator
surface can be flat. [0040] xviii. The cutting insert can comprise
an insert cutting plane which extends perpendicular to the insert
base surface and an insert longitudinal plane, the insert
longitudinal plane extending longitudinally through the cutting
insert and perpendicular to the insert base surface. In a bottom
view of the cutting insert, the insert cutting plane can
theoretically divide the cutting insert into imaginary first and
second insert halves. In a bottom view of the cutting insert, the
first and second insert abutment surfaces can be at least partially
located at the first insert half and the insert actuator surface
can be located at the second insert half. At least a majority of
the first insert abutment surface and/or the second insert abutment
surfaces can be located at the first insert half. An entirety of
the second insert abutment surface can be located at the first
insert half. An entirety of each of the first and second insert
abutment surfaces can be located at the first insert half. [0041]
xix. In a bottom view of the cutting insert, closest portions of
the first and second insert abutments surfaces can be closer to the
cutting edge than to the insert cutting plane. [0042] xx. In a
bottom view of the cutting insert, the insert anti-slip
arrangement, or each insert anti-slip arrangement, can be
asymmetric about an insert longitudinal plane. [0043] xxi. The
insert base surface can extend along the entire insert peripheral
surface. [0044] xxii. A first insert base width of the insert base
surface which extends from, and perpendicular to, the first insert
abutment surface (of each anti-slip arrangement), can be greater
than a second insert base width which extends from, and
perpendicular to, the second insert abutment surface (of each
anti-slip arrangement). [0045] xxiii. The insert base surface can
be flat. [0046] xxiv. The cutting insert can be indexable. The
cutting insert can comprise an additional, i.e. a second, insert
anti-slip arrangement. Such construction could be for a different
indexed position. The additional insert anti-slip arrangement can
have any feature of the first anti-slip arrangement. The additional
insert anti-slip arrangement can have the same features as the
first anti-slip arrangement. Each insert actuator surface of one of
the insert anti-slip arrangements can connect the first and second
insert abutments surfaces of the other insert anti-slip
arrangement. [0047] xxv. The cutting insert can have 180.degree.
rotational symmetry around an insert central axis extending
perpendicular to, and through the center of, the insert base
surface. [0048] xxvi. The clamp's force application can be in a
direction parallel to the tool base surface. [0049] xxvii. The tool
actuator surface can extend perpendicular to the tool base surface.
[0050] xxviii. The clamp and/or tool can be configured for linear
motion of the clamp. The linear motion of the clamp is in a
direction transverse to the cutting direction. The tool can be
formed with a track. The track can be a linear track within which
the clamp is permitted linear motion. The track can be bounded by
an inner wall of the tool. The track and the clamp can be
configured for continuous contact of the inner wall and clamp at
each position thereof. [0051] xxix. The clamp can have a clamp wall
surface which forms an internal acute clamp angle .alpha. with the
tool actuator surface. The clamp angle .alpha. can fulfill the
condition 30.degree.<.alpha.<80.degree.. [0052] xxx. In a
clamped position, the clamp can have a clamp wall surface which
contacts an inner wall of the tool. [0053] xxxi. In a plan view of
the tool, each of the first and second insert abutment surfaces and
the insert actuator surface can face inwardly. [0054] xxxii. Each
pair of points of the first and second tool abutment surfaces which
are closer to the tool actuator surface plane than another pair of
points, can have a predetermined distance of greater magnitude than
the latter pair of points. In a plan view of the insert seating
region, the first and second tool abutment surfaces can extend at
an angle of less than 180.degree. to each other. [0055] xxxiii. In
a plan view of the insert seating region, the first and/or second
tool abutment surfaces can extend in a straight line. [0056] xxxiv.
In a plan view of the insert seating region, the first and second
tool abutment surfaces extend at an acute angle to each other.
[0057] xxxv. In a plan view of the insert seating region, the first
tool abutment surface can be longer than the second tool abutment
surface. [0058] xxxvi. The first and second tool abutment surfaces
and the tool actuator surface can be recessed into the insert
seating region. [0059] xxxvii. The tool actuator surface and/or the
first and second tool abutment surfaces of the tool can be
perpendicular to the tool base surface or at least partially
slanted in an upward-inward direction. [0060] xxxviii. The first
and second tool abutment surfaces can be formed in a single tool
recess. [0061] xxxix. The tool actuator surface and the first and
second tool abutment surfaces can be portions of a single
continuous shape. [0062] xl. The tool actuator surface can have a
blunt shape. The bluntness of the tool actuator surface can be for
providing a consistent or controlled force application direction.
The tool actuator surface can have a curvature which does not
extend along, or is free of, portions which are tangential to
surfaces connected thereto. The tool actuator surface can be
convexly curved. The tool actuator surface can have a curvature
which is only apparent in a magnified view. [0063] xli. In a plan
view of the insert seating region, the tool actuator surface can
follow a straight line. The blunt shape of the tool actuator
surface can be flat. [0064] xlii. The tool base surface can extend
along the entire insert seating region except for a portion
completed by the clamp. [0065] xliii. A first tool base width of
the tool base surface which extends from, and perpendicular to, the
first tool abutment surface, can be greater than a second tool base
width which extends from, and perpendicular to, the second tool
abutment surface. [0066] xliv. The tool base surface can be flat.
[0067] xlv. The tool anti-slip arrangement and the insert anti-slip
arrangement can be configured to prevent motion of the cutting
insert in a plane parallel with the tool base surface. [0068] xlvi.
The tool anti-slip arrangement and the insert anti-slip arrangement
can be configured to prevent motion of the cutting insert only in a
plane parallel with the tool base surface. [0069] xlvii. The tool
can be additionally configured to apply a clamping force or
otherwise prevent disengagement of the cutting insert's base
surface from the tool base surface. For example, the tool can
comprise a biasing arrangement configured to bias the insert base
surface against the tool base surface. [0070] xlviii. The biasing
arrangement can be configured to allow slippage of the cutting
insert along the tool base surface. The slippage allowed can be
visible slippage. [0071] xlix. The cutting insert and/or the tool
can be configured so that the only surfaces of the tool which
contact a periphery of the cutting insert are the tool actuator
surface and the first and second tool abutment surfaces. [0072] l.
The cutting insert and/or the tool can be configured so that the
only surfaces of the tool which contact the cutting insert are the
tool actuator surface, the tool base surface and the first and
second tool abutment surfaces. [0073] li. The tool actuator surface
and the insert actuator surface can be both blunt. Preferably,
exactly one of the two actuator surfaces can be flat. [0074] lii.
The first and second tool abutment surfaces can be integrally
formed with the tool. [0075] liii. The first and second insert
abutment surfaces can be integrally formed with the cutting insert.
[0076] liv. The insert seating region can be formed with an insert
pocket comprising at least two walls. [0077] lv. Clamping of the
cutting insert to the tool can comprise sliding motion of the
cutting insert's insert base surface along the tool base surface.
[0078] lvi. The insert anti-slip arrangement can be spaced apart
from or separate from the insert peripheral surface.
BRIEF DESCRIPTION OF THE DRAWINGS
[0079] For a better understanding of the subject matter of the
present application, and to show how the same may be carried out in
practice, reference will now be made to the accompanying drawings,
in which:
[0080] FIG. 1A is a perspective view of a tool assembly;
[0081] FIG. 1B is a plan view of the tool assembly in FIG. 1;
[0082] FIG. 1C is a side view of the tool assembly in FIGS. 1 and
2;
[0083] FIG. 1D is an exploded view of the tool assembly in FIGS. 1
to 3;
[0084] FIG. 2 is a plan view of a tool of the tool assembly in
FIGS. 1A to 1D;
[0085] FIG. 3A is a side view of the cutting insert in FIGS. 1A to
1D;
[0086] FIG. 3B is a bottom perspective view of a cutting insert in
FIG. 3A;
[0087] FIG. 3C is a bottom view of the cutting insert in FIGS. 3A
and 3B;
[0088] FIG. 3D is an enlarged bottom view of the cutting insert in
FIGS. 3A to 3D;
[0089] FIG. 3E is a schematic view of an abutment surface, a
non-abutment surface and connecting surfaces thereto;
[0090] FIG. 4A is a top perspective view of a clamp in FIGS. 1A to
1D;
[0091] FIG. 4B is a side view of the clamp in FIG. 4A;
[0092] FIG. 4C is a perspective side view of the clamp in FIGS. 4A
and 4B;
[0093] FIG. 4D is a plan view of the clamp in FIGS. 4A to 4C;
[0094] FIG. 5A is a plan view of a tool, including a screw and
clamp thereof, in FIGS. 1A to 1D;
[0095] FIG. 5B is an enlarged view of a portion of the tool, screw
and clamp in FIG. 5A; and
[0096] FIG. 5C is an enlarged view of a portion of the tool, screw
and clamp in FIG. 5A, with the clamp located in a different
position to FIGS. 5A and 5B.
DETAILED DESCRIPTION
[0097] An example of the subject matter of the present example is
described as follows.
[0098] Referring to FIGS. 1A to 1D, which illustrate a tool
assembly 10 comprising a tool 12 and at least one cutting insert 14
clamped thereto. For simplification purposes, the tool exemplified
is a milling tool-head, however any tool-head or tool including a
shaft or body, etc., could also be defined as a tool for the
purposes of the specification and claims, provided that such
component comprises an insert seating region configured for
clamping of a cutting insert thereto.
[0099] The tool assembly 10, in this non-limiting example, is
configured to mill a workpiece (not shown) by rotating about a tool
axis A.sub.T in a rotation direction D.sub.R, which in this
non-limiting example can be counterclockwise.
[0100] Referring also to FIG. 2, the tool 12 can comprise an insert
seating region 16 comprising a tool base surface 18, tool inner and
peripheral regions 20, 22 located on opposing sides of the insert
seating region 16, and a tool anti-slip arrangement 24.
[0101] More precisely, the tool anti-slip arrangement 24 can
comprise first and second tool abutment surfaces 26A, 26B formed
adjacent to the tool base surface 18, and a clamp 28 comprising a
tool actuator surface 30.
[0102] The clamp 28 can be located at the tool inner region 20. The
tool actuator surface 30 can be oriented transverse to the tool
base surface 18.
[0103] Referring now also to FIGS. 3A to 3C, the cutting insert 14
can comprise opposing insert top and base surfaces 32, 34 which are
connected by an insert peripheral surface 36, at least one cutting
edge 38, and an insert anti-slip arrangement 40 formed adjacent to
the insert base surface 34.
[0104] The insert anti-slip arrangement 40 can comprise first and
second insert abutment surfaces 42A, 42B and an insert actuator
surface 44 which is oriented transverse to the insert base surface
34. Thus, the periphery of the cutting insert 14 may be considered
to include not only the insert peripheral surface 36, but also the
insert actuator surface 44 and first and second insert abutment
surfaces 42A, 42B, which are oriented transverse to the insert base
surface 34.
[0105] The first and second tool abutment surfaces 26A, 26B and
first and second insert abutment surfaces 42A, 42B are configured
for engaging each other. As best shown in FIGS. 2 and 3C, the
abutment surfaces 26A, 26B, 42A, 42B can have corresponding shapes
(in this example following straight lines) and orientations and can
extend at a cutting insert abutment or tool abutment angle
.gamma..sub.CA, .gamma..sub.TA of less than 180.degree. to each
other. In this non-limiting example, each pair of abutment surfaces
can respectively form a wedge-shaped arrangement.
[0106] To clamp the cutting insert 14 to the tool 12, the cutting
insert 14 is mounted on the tool 12 in a position in which the
insert base surface 34 contacts the tool base surface 18. Stated
differently, the cutting insert 14 can be seated on the tool 12,
via the tool and insert base surfaces 18, 34 thereof. Subsequently,
the clamp's tool actuator surface 30 can be biased against the
insert actuator surface 44 resulting in the first and second insert
abutment surfaces 42A, 42B being respectively biased against the
first and second tool abutment surfaces 26A, 26B.
[0107] It will be understood that such clamping can be advantageous
for preventing slippage of a cutting insert along a tool base
surface since a cutting insert can be simultaneously clamped on
three surfaces thereof, namely an insert actuator surface, and
first and second insert abutment surfaces thereof. It will be
understood that in cases of non-parallel abutment surfaces,
simultaneous three-point contact can be achieved, the three points
(or three surfaces) being located in a non-linear arrangement and
hence can constitute a triangular arrangement. In particular, such
arrangement of the abutment surfaces and actuator surfaces is
suitable for preventing translation and rotation, of a cutting
insert relative to a tool, along a base plane P.sub.B (FIGS. 1B and
2) which is parallel with the tool base surface 18 and insert base
surface 34.
[0108] A further advantage may be possibly achieved by biasing the
tool actuator surface 30 in a cutting direction D.sub.C (FIG. 2).
It will be understood that a tendency of cutting insert 14 to slide
or be moved out of a desired position, can be greatest at an active
first cutting end 46 thereof (FIG. 1C) when it is in contact with a
workpiece (not shown). By securing the active first cutting end 46
of the cutting insert, through applying clamping force outward from
the tool, maintenance of a precise location of the cutting insert
or active first cutting end 46 is achievable.
[0109] The cutting direction D.sub.C can be defined as extending
from the tool inner region 20 towards the tool peripheral region
22. More precisely, a cutting insert is normally mounted at a
peripheral part of a tool, and normally protrudes from the tool to
ensure that only the cutting insert, and not the tool contacts a
workpiece (not shown). Therefore, such tool peripheral region 22
can be considered as comprising a peripheral edge 48 (FIG. 1D)
surrounding a protruding cutting edge 38 of the cutting insert 14,
when mounted to the tool 12, or, when the cutting insert 14 is not
mounted to the tool 12, the tool peripheral region 22 can be
considered as a peripheral edge 48 surrounding the insert seating
region 16. Stated alternatively, i.e. in relation to the cutting
insert 14, the cutting direction can be considered to extend from a
non-cutting end 50 thereof (FIG. 1C) in towards an active first
cutting end 46 thereof.
[0110] It is noted that the cutting insert 14 and/or the tool 12
can be configured so that the only surfaces of the tool 12 which
contact a periphery of the cutting insert 14 are the tool actuator
surface 30 and the first and second tool abutment surfaces 26A,
26B. Stated differently, surfaces of the tool which extend upwardly
from the tool 12, or, surfaces adjacent the insert peripheral
surface 36, such as tool wall surfaces 52A, 52B (FIGS. 1C and 2),
are spaced-apart from the cutting insert 14. As such tool wall
surfaces do not contact the insert peripheral surface 36, which in
this example forms, at an intersection with the top surface 32, the
cutting edge 38. The tool 12 can be suitable to hold cutting
inserts of different shapes. Stated differently yet, the
above-construction can configure a tool for holding different
shaped cutting inserts (albeit which have a correspondingly shaped
anti-slip arrangement). Accordingly it can be an advantageous for a
cutting insert or tool to have spaced-apart anti-slip arrangements
and cutting edges or tool wall surfaces, respectively.
[0111] Further, more specific exemplary features will now be
described.
[0112] The cutting edge 38 in this example here extends along the
entire intersection of the insert top surface 32 and insert
peripheral surface 36. However, in the mounted position shown in
FIG. 1C, the active first cutting end 46, in this non-limiting
example, comprises only a portion of the edge including first and
second lateral cutting edge portions 54A, 54B and an end cutting
edge portion 54C extending therebetween.
[0113] The insert top surface 32, at least a portion thereof
adjacent to the active first cutting end 46, can be configured as a
rake surface over which chips (not shown) pass, and at least a
portion of the insert peripheral surface 36 adjacent thereto can be
configured as a relief surface.
[0114] Drawing attention to FIG. 3C, the cutting insert 14 can
comprise an insert cutting plane P.sub.IC which extends
perpendicular to the insert base surface 34 and an insert
longitudinal plane P. The insert longitudinal plane P.sub.IL
extends longitudinally through the cutting insert 14, connects
opposing first and second cutting ends 46, 46' and is perpendicular
to the insert base surface 34. The insert cutting plane P.sub.IC
theoretically divides the cutting insert 14 into imaginary first
and second insert halves 56A, 56B. As shown, the first and second
insert abutment surfaces 42A, 42B can be at least partially located
at the first insert half 56A and the insert actuator surface 44 can
be located at the second insert half 56B. In the present
non-limiting example an entirety of the second abutment surface 42A
is located at the first insert half 56A.
[0115] It will be understood that the insert actuator surface 44
and/or tool actuator surface 30 can be more suitable for stable
engagement if at least one, and preferably both, of the two has a
blunt shape.
[0116] At least when viewing FIG. 3D, i.e. in a non-magnified view,
it can be noticed that the insert actuator surface 44 appears flat
and hence can lie in an insert actuator plane P.sub.IA.
[0117] The insert actuator plane P.sub.IA can be oriented
transverse to the insert base surface 34, that the insert actuator
surface can extend in a direction away from the insert top surface
32, and that the insert actuator surface can follow a straight
line.
[0118] When the clamp 28 is mounted to the tool 12, the tool
actuator surface 30 can extend perpendicular to the tool base
surface 18.
[0119] The first and second insert abutment surfaces 42A, 42B and
the insert actuator surface 44 constitute a first set of engagement
surfaces which are associated with the first cutting end 46.
[0120] Referring to FIG. 3E, the insert actuator surface 44 of this
first set can extend between two other surfaces, which in the
present example (showing an indexable insert) can be additional
first and second insert abutment surfaces 42A', 42B' belonging to a
second, additional set of engagement surfaces and are associated
with the second cutting end 46'. The additional first and second
insert abutment surfaces 42A', 42B'can comprise end points 58A, 58B
which can be connection points with the insert actuator surface
44.
[0121] It has been found that when using a blunt actuator surface
(i.e. the insert actuator surface 44 and/or the tool actuator
surface 30), there can be an advantageous effect of achieving a
consistent or controlled force application direction. In other
words, a cutting insert can be directed in a precise direction to
best achieve a precise, stable mounting arrangement. It will be
understood that an actuator surface which is not blunt (i.e. having
a small radius of curvature, such as shown by the imaginary line
designated by the numeral 60 in FIG. 3E, or a V-shape in a plan
view) is likely to be more prone to allowing an applied force to be
directed in inconsistent or uncontrolled directions, especially
during application of cutting forces on a cutting insert or
associated tool.
[0122] Notably, the example shown in FIG. 3D, while appearing
flat/straight in a plan view from afar, would be shown to have a
slight convex curvature if magnified. This is because,
surprisingly, it has been found that the most preferred
configuration is a very slightly curved, preferably
convexly-curved, (e.g. as schematically exemplified in FIG. 3E)
insert actuator surface (or, alternatively, a very slightly
convexly-curved tool actuator surface), which can allow precise,
consistent contact on a single point thereof. It has also been
found that the most preferable configuration is one in which the
alternate actuator surface (i.e. the actuator surface which is not
convexly-curved, in this case the tool actuator surface 30) is flat
(i.e. without curvature).
[0123] To elaborate, a blunt actuator surface, in this example
being the insert actuator surface 44, can be more precisely defined
as having a curvature which does not extend along, or is free of,
portions which are tangential to the additional first and second
insert abutment surfaces 42A', 42B' (or other surfaces connected to
the insert actuator surface 44).
[0124] Referring only to FIG. 3E, to elaborate further, and for the
purpose of comparison only, the imaginary surface 60 is shown which
has a smaller radius of curvature than the exemplified, and
exaggeratedly curved for the purpose of understanding, insert
actuator surface 44. The imaginary surface 60 has portions 61A, 61B
between end points 58A, 58B and a middle section thereof, which are
tangential to imaginary tangent lines 62A, 62B. The imaginary
surface 60 is not considered blunt due to the small radius of
curvature thereof. Rather, an actuator surface having a greater
curvature, or being flat, and approaching a straight reference line
L.sub.R which extends between the end points 58A, 58B is considered
blunt. It is reiterated that the insert actuator surface 44 in FIG.
3E is exaggeratedly curved and a more realistic view thereof is
shown in FIG. 3D. In summary, it is preferable that at least one of
the actuator surfaces 30, 44 of the tool assembly 10 approach or
tend towards being flat, without being perfectly flat. It is also
preferable, yet not essential, that the alternate actuator surface
30, 44 be flat. Regarding the tendency to flatness, the actuator
surface 30, 44 should be flatter than an imaginary surface 60
having a curvature extending along tangent lines. Preferably, such
actuator surface 30, 44 should be far flatter than such imaginary
surface 60. For example, if an outermost point 61C of the imaginary
surface 60 extends a first distance D.sub.1 perpendicular to the
straight reference line L.sub.R, the outermost point 44A of the
actuator surface 44 should preferably extend a second distance
D.sub.2 which is 25% of, or less than, the first distance D.sub.1,
and, even more preferably, 10% of, or less than, the first distance
D.sub.1.
[0125] While not shown, it will be understood that an actuator
surface may still be considered blunt in a case where there is a
mere intermediary change of radius at the end points 58A, 58B. This
is because the purpose of the bluntness is most relevant at the
outermost point 44A, or contact point, or, least a central portion
of the actuator surface 44, which is configured to engage another
associated actuator surface.
[0126] Referring to FIG. 3D the first and second insert abutment
surfaces 42A, 42B and the insert actuator surface 44 face outward
from the cutting insert 14 (exemplified by outwardly directed
arrows designated 62A, 62B and 62C).
[0127] As best shown in FIG. 3A, the first and second insert
abutment surfaces 42A, 42B and the insert actuator surface 44 can
extend in a direction away from the insert top surface 32
(exemplified by a downwardly directed arrow designated as 64).
[0128] Referring now to FIG. 3B, in the non-limiting example shown,
all of the first and second insert abutment surfaces 42A, 42B, and
the insert actuator surface 44 are formed on a single protuberance
70 which has a non-contacting lower protuberance surface 71 (FIG.
3B). The insert actuator surface 44 and the first and second insert
abutment surfaces 42A, 42B can be formed on a single protuberance
70 which itself may be formed in a central area of the insert base
surface 34 and spaced apart on all sides from the insert peripheral
surface 36 by the insert base surface 34.
[0129] The exemplary cutting insert 14 shown is indexable, and can
have 180.degree. rotational symmetry around an insert central axis
A.sub.IC (FIG. 3D) extending perpendicular to, and through the
center of, the insert base surface 34. Accordingly, the cutting
insert 14 can be configured with a second insert anti-slip
arrangement 40'. The second insert anti-slip arrangement 40' can
comprise the additional first and second insert abutment surfaces
42A', 42B' mentioned above, and an additional insert actuator
surface 44'.
[0130] As shown, the surfaces 42A, 42B, 44, 42A', 42B', 44' of the
first and second insert anti-slip arrangements 40, 40' form all
sides of or enclose the single protuberance 70. Thus, the single
protuberance 70 of the non-limiting example cutting insert 14
shown, can be considered to have two sets of engagement surfaces, a
first set including surfaces 42A, 42B and 44 and a second set
including surfaces 42A', 42B' and 44'.
[0131] Referring now to the surfaces of the tool anti-slip
arrangement 24, as shown in FIG. 2, it will be understood that they
can have corresponding features to the insert anti-slip arrangement
40, mutatis mutandis.
[0132] Additionally, the first and second tool abutment surfaces
26A, 26B and the tool actuator surface 30 can face inwardly (i.e.,
toward the center of the insert seating region 16, as exemplified
by inwardly directed arrows designated 72A, 72B and 72C).
[0133] The first and second tool abutment surfaces 26A, 26B and the
tool actuator surface 30 can be recessed into the insert seating
region 16. Stated differently, the first and second tool abutment
surfaces 26A, 26B and the tool actuator surface 30 can be side
surfaces of a recess 74 formed in the insert seating region 16.
[0134] While the exemplary tool actuator surface 30 and the first
and second tool abutment surfaces 26A, 26B shown are perpendicular
to the tool base surface 18, they could also be at least partially
slanted in a upward-inward direction (for example, as shown in FIG.
4B, the tool actuator surface 30 could be slanted in the
upward-inward direction shown by the arrow designated as 76.
Similarly, while the exemplary insert actuator surface 44 and the
first and second insert abutment surfaces 42A, 42B shown are
perpendicular to the insert base surface 34, they could also be at
least partially slanted in a downward-outward direction (for
example the insert actuator surface 44 could be slanted in the
downward-outward direction shown by the arrow designated as 66; for
comparison, the arrow designated as 68 is directed a
downward-inward direction).
[0135] Referring to FIG. 3D, it will be understood that there can
be insert abutment surface planes, for example first and second
insert abutment surface planes P.sub.1, P.sub.2, each of which are
parallel to the insert actuator surface plane P.sub.IA. It is noted
that the first insert abutment surface plane P.sub.1 is closer to
the insert actuator surface plane P.sub.IA and that a pair of
points 78A, 78B of the first and second insert abutment surfaces
42A, 42B which lie on the first insert abutment surface plane
P.sub.1 are spaced apart from each other a greater magnitude of
distance than a pair of points 80A, 80B which lie on the second
insert abutment surface plane P.sub.2. Thus, again with reference
to FIG. 3D, the first and second insert abutment surfaces 42A, 42B
belonging to the first set of engagement surfaces converge in a
direction toward the additional insert actuator surface 44'
belonging to the second set of engagement surfaces and also toward
the associated first cutting end 46. Similarly, the additional
first and second insert abutment surfaces 42A', 42B' belonging to
the second set of engagement surfaces converge in a direction
toward the insert actuator surface 44 belonging to the first set of
engagement surfaces and also toward the associated second cutting
end 46'.
[0136] The construction above can also be possible for the tool
anti-slip arrangement 24, mutatis mutandis (For example see FIG.
5A, wherein the tool actuator surface plane P.sub.TA corresponds to
the insert actuator surface plane P.sub.IA; first and second tool
abutment surface planes P.sub.3 and P.sub.4 correspond to first and
second insert abutment surface planes P.sub.1, P.sub.2; points 78C,
78D correspond to points 78A, 78B; and points 80C, 80D correspond
to points 80A, 80B). Accordingly, tool abutment surfaces 26A, 26B
converge as they tend toward the tool peripheral region 22
[0137] Referring to FIGS. 3A and 3B, the protuberance 70 on which
the insert first and second abutment surfaces 42A, 42B are formed
can be entirely spaced apart from the insert peripheral surface 36.
Stated differently, the insert base surface 34 can extend
continuously along the entire insert peripheral surface 36 and can
completely surround the insert first and second abutment surfaces
42A, 42B and the insert actuator surface 44. The base surface 34
can be flat.
[0138] It will be understood that any of the above features, e.g. a
continuous insert base surface 34, a base surface which extends
along a periphery of a cutting insert, a flat base surface, etc.,
can provide stable mounting of a cutting insert on a tool.
[0139] Any of the above constructional features can also be
possible for the tool base surface 18, mutatis mutandis. However,
the tool base surface can, for example, extend along the entire
insert peripheral surface except for a portion completed by the
clamp 28.
[0140] Referring to FIGS. 1D and 2, a first portion 80 of the tool
base surface 18 adjacent to the first tool abutment surface 26A has
less material thereunder than a second portion 82 of the tool base
surface 18 which is closer to the tool axis A.sub.T (FIG. 1C). In
such cases, it has been found that forming the first portion 80 of
the tool base surface 18 to be larger than the second portion 82 of
the tool base surface 18 can possibly provide advantageous
constructional strength, especially in such cylindrical tools.
[0141] Such enlargement can be achieved by widening the first
portion 80. For example, a first tool base width W.sub.T1 of the
first portion 80 of the tool base surface 18 which extends from,
and perpendicular to, the first tool abutment surface 26A, can be
greater than a second tool base width W.sub.T2 which extends from,
and perpendicular to, the second tool abutment surface 26B.
[0142] The insert base surface 34 can be configured to correspond
to the tool base surface 18. For example, referring to FIG. 3D, a
first insert base width W.sub.I1 of the insert base surface 34
which extends from, and perpendicular to, the first insert abutment
surface 42A, can be greater than a second insert base width
W.sub.I2 which extends from, and perpendicular to, the second
insert abutment surface 42B.
[0143] While it will be understood that a cutting insert can be
clamped to a tool in various ways, the following is an exemplary
clamping arrangement.
[0144] The tool and insert base surfaces 18, 34 can be clamped
against each other by a biasing arrangement 84 (FIG. 1D). This
biasing arrangement 84 or a different one, can, in any case, be
configured to prevent movement of a cutting insert in a direction
away from a tool base surface.
[0145] The biasing arrangement 84 can comprise a biasing
arrangement screw 86 configured to extend through a through hole 88
of the cutting insert 14, and a threaded bore 90 formed in the tool
12 to which the biasing arrangement screw 86 is securable.
[0146] Drawing attention to FIGS. 1D, and 4A to 4D, the clamp 28
can be configured to receive a clamp screw 97 via a clamp bore 95
(FIG. 4D) formed in the clamp 28.
[0147] More precisely, the clamp 28 can comprise a slanted clamp
surface 92 located between the tool actuator surface 30 and the
clamp bore which is comprised to be abutted by the clamp screw
97.
[0148] While a clamp could conceivably comprise a bendable portion
which could cause a change of position, or orientation, of a tool
actuator surface, the non-limiting example shown is one where the
entire clamp 28 is movable upon engagement by the clamp screw
97.
[0149] It will be understood that the biasing arrangement 84, or a
different arrangement, can be configured to allow slippage of the
cutting insert 14 along the tool base surface 18, as the biasing
arrangement screw 86 will normally allow limited slippage along the
base plane P.sub.B.
[0150] Consequently, clamping of the cutting insert 14 to the tool
12 can comprise sliding motion of the cutting insert's insert base
surface 34 along the tool base surface 18.
[0151] It has been found that wedging at least a portion of a clamp
between an insert and a tool wall can provide a stable clamping
arrangement.
[0152] For example, referring to FIGS. 5A to 5C, the clamp 28 can
be moved a motion direction D.sub.M which is transverse to the
cutting direction D.sub.C. FIG. 5B shows a first position wherein
there is a gap 98 between the tool actuator surface 30 and insert
actuator surface 44, and FIG. 5C shows contact of the tool actuator
surface 30 and insert actuator surface 44.
[0153] As shown best in FIG. 2, the tool 12 can be formed with a
track 94 bounded by an inner wall 96. Said wedging can occur
between the insert actuator surface 44 and the inner wall 96.
[0154] An internal direction angle A.sub.D formed between the
cutting direction D.sub.C and the motion direction D.sub.M can be
an acute angle. Preferably, the direction angle A.sub.D can be
between 30.degree. and 80.degree..
[0155] Referring to FIG. 4D, an internal clamp angle .alpha. of a
clamp wall surface 100 with the tool actuator surface 30 (or at
least extensions thereof) can be an acute. The clamp angle .alpha.
can fulfill the condition 30.degree.<.alpha.<80.degree..
[0156] The description above includes one or more exemplary
embodiments and details for enablement, if needed, of claimed
subject matter, and does not exclude non-exemplified embodiments
and details from the claim scope of the present application.
* * * * *