Cutting insert with lower anti-slip recess, insert holder and cutting tool

Abstract

A cutting blade comprises a blade peripheral surface and a blade lower surface, wherein the blade peripheral surface comprises at least one planar main blade side abutting surface, and the blade lower surface comprises an anti-skid recessed in the blade lower surface. The anti-skid recess comprises at least one elongated and straight anti-skid groove. Each main blade side abutting surface is oriented parallel to the longitudinal axis of the corresponding anti-skid groove. A blade holder comprises a holder cavity. The holder cavity comprises a cavity peripheral surface, wherein the cavity peripheral surface comprises a planar main cavity side abutting surface and a cavity base surface having an elongated and straight anti-skid rib. When the cutting blade is attached to the blade holder in a releasable manner, in order to constitute a fastening position of the cutting tool, the anti-skid rib is located in the anti-skid groove, and the anti-skid groove is oriented parallel to the main blade side abutting surface adjacent to the main cavity side abutting surface.

Description

Technical Field

[0001] The subject matter of the present application relates to a cutting tool of the type in which a cutting insert is releasably retained in a holder pocket of a insert holder, and in particular to such a cutting tool having an anti-slip arrangement. Background Art

[0002] The cutting blade can be releasably clamped in the holder pocket of the blade holder by a mounting mechanism, such as a set screw or a clamping arm. In the event of a failure of the mounting mechanism, the cutting blade can be displaced in the holder pocket. This event is particularly problematic for cutting tools that are not fixed cutting tools, such as rotating cutting tools (e.g., milling cutters), in which the cutting blade can be completely removed from the holder pocket at a high speed, thereby causing damage and / or injury to the machine and / or the user. Therefore, the cutting tool can be provided with an anti-slip arrangement structure for preventing the cutting blade from sliding out of the holder pocket.

[0003] In some such anti-slip arrangements, the cutting insert may include a recess and the retainer pocket may include a protrusion that is located in the recess when the cutting tool is in the assembled position. For example, an example is disclosed in US 7,645,100, in which a turning insert engages with an insert seat via an engagement portion that includes elongated and straight female and male engagement members that in turn engage with each other to prevent the turning insert from rotating within the insert pocket.

[0004] Another example is disclosed in US 9,481,038, in which the anti-slip arrangement structure of the cutting insert includes a first insert abutment surface having a dovetail portion, a second insert abutment surface and a third insert abutment surface, each of the dovetail portions forming an outer acute dovetail angle with the insert base surface. The dovetail portion is configured to fix the cutting insert to a machine tool. Summary of the invention

[0005] According to a first aspect of the subject matter of the present application, there is provided a cutting insert having an insert center axis defining opposite upward and downward directions, the cutting insert comprising:

[0006] opposing upper and lower blade surfaces and a blade peripheral surface extending therebetween, the blade peripheral surface extending circumferentially about a blade central axis and including at least one major blade side abutment surface that is planar;

[0007] at least one upper cutting edge formed at the intersection of the insert peripheral surface and the insert upper surface and circumferentially displaced relative to the at least one main insert side abutment surface; and

[0008] An anti-skid recess is recessed in the lower surface of the blade, the anti-skid recess defines a lower anti-skid recess, the lower anti-skid recess includes at least one elongated and straight anti-skid groove, the at least one anti-skid groove has:

[0009] The longitudinal axis of the groove;

[0010] a first slot plane, the first slot plane containing the slot longitudinal axis and the insert center axis;

[0011] a second slot plane perpendicular to the first slot plane and containing the insert central axis; and

[0012] Two opposite axially extending groove end portions and a groove middle portion located between the two axially extending groove end portions, the groove middle portion intersecting the central axis of the blade; wherein,

[0013] The cutting insert is devoid of through holes opening to the insert upper surface and the insert lower surface for receiving a retaining screw; and

[0014] Each main blade side abutment surface is oriented parallel to the groove longitudinal axis of the corresponding anti-skid groove.

[0015] According to a second aspect of the subject matter of the present application, there is provided a blade holder having a holder longitudinal axis defining opposite forward and rearward directions, and comprising:

[0016] a retainer major surface that intersects the retainer end surface; and

[0017] A retainer pocket, the retainer pocket being recessed in the retainer major surface and opening to the retainer major surface at a pocket major opening, the retainer pocket having a pocket major axis and comprising:

[0018] Surface of the hole base;

[0019] a pocket peripheral surface oriented generally perpendicular to and forming a partial boundary of the pocket base surface, the pocket base surface not bounded by the pocket peripheral surface at the pocket main opening, the pocket peripheral surface extending circumferentially about the pocket main axis and including a planar pocket main side abutment surface located opposite and facing the pocket main opening;

[0020] a hole suspension portion formed integrally with the holder hole, the hole suspension portion being suspended on the hole base surface; and

[0021] An elongated and straight anti-skid rib protruding from the surface of the base of the well, the anti-skid rib extending longitudinally along the rib longitudinal axis and comprising:

[0022] a first rib plane containing the rib longitudinal axis and the pocket major axis; and

[0023] A second rib plane is perpendicular to the first rib plane and contains the main axis of the hole; wherein,

[0024] The main cavity side abutment surface is oriented parallel to the rib longitudinal axis.

[0025] According to a third aspect of the subject matter of the present application, there is provided a cutting tool comprising:

[0026] A cutting insert having an insert center axis defining opposite upward and downward directions, the cutting insert comprising:

[0027] opposing upper and lower blade surfaces and a blade peripheral surface extending between the upper and lower blade surfaces, the blade peripheral surface extending circumferentially about the blade central axis and including at least one major blade side abutment surface that is planar;

[0028] at least one upper cutting edge formed at the intersection of the insert peripheral surface and the insert upper surface and circumferentially displaced relative to the at least one main insert side abutment surface; and

[0029] An anti-skid recess is recessed in the lower surface of the blade, the anti-skid recess defines a lower anti-skid recess, the lower anti-skid recess includes at least one elongated and straight anti-skid groove, the at least one anti-skid groove has:

[0030] The longitudinal axis of the groove;

[0031] a first slot plane, the first slot plane containing the slot longitudinal axis and the insert center axis;

[0032] a second slot plane perpendicular to the first slot plane and containing the insert central axis; and

[0033] Two opposite axially extending groove end portions and a groove middle portion located between the two axially extending groove end portions, the groove middle portion intersecting the central axis of the blade; wherein,

[0034] Each primary blade side abutment surface is oriented parallel to a groove longitudinal axis of a corresponding anti-skid groove; and

[0035] A blade holder having a holder longitudinal axis defining opposite forward and rearward directions and comprising:

[0036] a retainer major surface that intersects the retainer end surface; and

[0037] A retainer pocket recessed in the retainer major surface and opening to the retainer major surface at a pocket major opening, the retainer pocket having a pocket major axis and comprising:

[0038] Surface of the hole base;

[0039] a pocket peripheral surface oriented generally perpendicular to and forming a partial boundary of the pocket base surface, the pocket base surface not bounded by the pocket peripheral surface at the pocket main opening, the pocket peripheral surface extending circumferentially about the pocket main axis and including a planar main pocket side abutment surface located opposite and facing the pocket main opening; and

[0040] An elongated and straight anti-skid rib protruding from the surface of the base of the well, the anti-skid rib extending longitudinally along the rib longitudinal axis and comprising:

[0041] a first rib plane containing the rib longitudinal axis and the pocket major axis; and

[0042] A second rib plane is perpendicular to the first rib plane and contains the main axis of the hole; wherein,

[0043] The main cavity side abutment surface is oriented parallel to the rib longitudinal axis; wherein,

[0044] The cutting tool is adjustable between a released position and a secured position; and

[0045] In the fastening position of the cutting tool:

[0046] The cutting insert is releasably retained in the holder pocket;

[0047] The main cavity side abutment surface abuts against the main blade side abutment surface on which operation is performed;

[0048] at least one pocket support surface on the pocket base surface abuts a lower blade bearing surface on the lower blade surface; and

[0049] The anti-skid rib is located in an operative anti-skid groove oriented parallel to the operative primary blade side abutment surface.

[0050] It should be understood that the above description is general and the features described below can be applied to the subject matter of the present application in any combination. For example, any of the following features can be applied to a cutting insert, a blade holder or a cutting tool:

[0051] The cutting blade may be N-directionally indexable on the upper surface of the blade. The at least one upper cutting edge may include N upper cutting edges spaced circumferentially around the central axis of the blade, where N is a positive integer greater than 1. The at least one anti-skid groove may include M anti-skid grooves, where M=N / 2 when N is an even number, or M=N when N is an odd number.

[0052] The lower anti-slip recess may include a plurality of anti-slip grooves that are arranged at equal angles around the central axis of the blade and intersect with each other.

[0053] The plurality of anti-slip grooves may be identical.

[0054] The lower anti-slip recess may exhibit rotational symmetry about a central axis of the insert.

[0055] The at least one anti-slip groove may exhibit mirror symmetry about a first groove plane and also exhibit mirror symmetry about a second groove plane.

[0056] The at least one anti-slip groove may be spaced apart from the blade peripheral surface.

[0057] The blade lower surface may include a blade lower support surface that is planar and oriented perpendicular to the blade central axis.

[0058] The at least one anti-skid groove may include two opposite groove side walls and a groove central surface extending between the two opposite groove side walls, wherein the two opposite groove side walls and the groove central surface all extend longitudinally along the groove longitudinal axis. In a cross-sectional view taken along the first groove plane, the groove central surface may decrease in depth in a direction away from the groove middle portion and toward the two groove end portions.

[0059] The groove central surface may be curved in a concave manner in a direction along the groove longitudinal axis and may have a groove radius.

[0060] In a cross-sectional view taken along a plane perpendicular to the groove longitudinal axis and passing through the at least one anti-skid groove, the two groove side walls may converge with each other in a direction from the blade lower surface toward the blade upper surface.

[0061] The lower anti-slip recess may not open to the blade upper surface.

[0062] The insert peripheral surface may further comprise a planar secondary insert side abutment surface which is circumferentially spaced from the at least one primary insert side abutment surface about the insert central axis.

[0063] The cutting blade may also include: at least one lower cutting edge, which is formed at the intersection of the blade peripheral surface and the blade lower surface; and an additional anti-slip recess, which is recessed in the blade upper surface, and the additional anti-slip recess defines an upper anti-slip recess, and the upper anti-slip recess and the lower anti-slip recess have the same number of anti-slip grooves.

[0064] The upper anti-slip recesses and the lower anti-slip recesses may be identical.

[0065] The cutting blade may include exactly two upper cutting edges and exactly two lower cutting edges. The upper anti-skid recess and the lower anti-skid recess may each include exactly one anti-skid groove. The anti-skid groove at the lower anti-skid recess may be oriented perpendicular to the anti-skid groove at the upper anti-skid recess.

[0066] The cutting insert may include exactly four upper cutting edges.The lower anti-slip recess may include exactly two anti-slip grooves oriented perpendicularly to each other.

[0067] The at least one anti-slip groove may be a pressed groove having no marks due to grinding and no undercut in the direction of the insert center axis.

[0068] The at least one anti-slip groove may extend continuously along the groove longitudinal axis.

[0069] The anti-slip rib may include two opposite axially extending rib end portions and a rib middle portion located between the two axially extending rib end portions, wherein the rib middle portion intersects with the main axis of the pocket.

[0070] The pocket base surface may include at least one pocket support surface that is planar and oriented perpendicular to the pocket major axis.

[0071] The at least one pocket support surface may include exactly two coplanar pocket support surfaces located on opposite sides of the anti-slip rib.

[0072] The hole main axis may intersect the hole suspension portion.

[0073] The pocket peripheral surface may further include a planar secondary pocket-side abutment surface that is circumferentially spaced from the primary pocket-side abutment surface about the pocket primary axis.

[0074] The anti-slip rib may be spaced apart from the secondary pocket side abutment surface.

[0075] The holder pocket opens to the pocket outer lateral surface of the blade holder at the pocket secondary opening opposite the secondary pocket side abutment surface, the pocket base surface being not bounded by the pocket peripheral surface at the pocket secondary opening.

[0076] The pocket outer lateral surface may be formed on the retainer end surface.

[0077] The anti-slip rib may be spaced apart from the pocket opening.

[0078] The anti-skid rib may exhibit mirror symmetry about a first rib plane and also exhibit mirror symmetry about a second rib plane.

[0079] The anti-skid rib may include two rib side walls and a rib central surface extending between the two rib side walls, wherein the two rib side walls and the rib central surface all extend longitudinally in the direction of the rib longitudinal axis. In a cross-sectional view taken along the first rib plane, the rib central surface may decrease in height in a direction away from the rib middle portion and toward the two rib terminal portions.

[0080] The rib central surface may be curved in a convex manner in a direction along the rib longitudinal axis and may have a rib radius.

[0081] In a cross-sectional view taken along a plane perpendicular to the rib longitudinal axis and passing through the anti-slip rib, the two rib side walls may converge with each other in a direction away from the pocket base surface towards the pocket overhang portion.

[0082] The retainer pocket may be free of a threaded hole opening to the pocket base surface and adapted for threaded engagement with a retaining screw.

[0083] The hole suspension portion may include a suspension inner surface facing the hole base surface and a suspension transverse surface intersecting the suspension inner surface and oriented transversely to the suspension inner surface. The retainer hole may include a hole with a threaded hole that is recessed in at least the suspension transverse surface and opens to at least the suspension transverse surface.

[0084] The anti-skid rib may extend continuously along the rib longitudinal axis. The lower anti-skid recess may include a plurality of anti-skid grooves. In the fastening position of the cutting tool, any anti-skid groove oriented not parallel to the main cavity side abutment surface for operation may be unoccupied.

[0085] In the fastened position of the cutting tool, the anti-skid rib may not abut against the operative anti-skid groove.

[0086] The insert peripheral surface may also include at least one planar secondary insert side abutment surface, which is circumferentially spaced from the at least one primary insert side abutment surface around the insert center axis. The hole peripheral surface may also include a planar secondary hole side abutment surface, which is circumferentially spaced from the primary hole side abutment surface around the hole main axis. In the tightening position of the cutting tool, the secondary hole side abutment surface may abut the secondary insert side abutment surface in operation.

[0087] The upper surface of the blade may include an upper clamping surface of the blade. The blade holder may include an independent clamping member, which includes a clamping male threaded portion and a clamping female portion. The holder hole may also include a hole with a threaded hole and a hole suspension portion, the hole with a threaded hole is recessed in at least the suspension transverse surface and is open to at least the suspension transverse surface, the hole suspension portion is formed as a whole with the holder hole, the hole suspension portion is suspended on the hole base surface, the hole suspension portion includes a suspension inner surface and a suspension transverse surface, the suspension inner surface faces the hole base surface, the suspension transverse surface intersects with the suspension inner surface and is oriented transversely to the suspension inner surface. In the tightening position of the cutting tool, the cutting blade can be releasably retained to the blade holder by the clamping male threaded portion and the clamping female portion, the clamping male threaded portion is received in the hole with a threaded connection, and the clamping female portion is adjacent to the upper clamping surface of the blade when clamped. BRIEF DESCRIPTION OF THE DRAWINGS

[0088] In order to better understand the present application and to show how the present application may be implemented in practice, reference will now be made to the accompanying drawings, in which:

[0089] Figure 1 is a three-dimensional view of a holder pocket and a double-sided cutting insert of a cutting tool;

[0090] Figure 2 yes Figure 1 Exploded diagram of

[0091] Figure 3 According to the present invention Figure 1 A three-dimensional view of a cutting blade in FIG.

[0092] Figure 4 The cutting blade is along Figure 5 A cross-sectional view taken along line IV-IV in FIG.

[0093] Figure 4a yes Figure 4 Details in;

[0094] Figure 5 yes Figure 3 A bottom view of the cutting blade in FIG.

[0095] Figure 6 is a perspective view of a single-sided cutting insert according to the present invention;

[0096] Figure 7 is a perspective view of another double-sided cutting insert according to the present invention;

[0097] Figure 8 yes Figure 1 A three-dimensional view of a retaining element cavity in FIG.

[0098] Fig. 9 is Figure 8 A first side view of the holder pocket in the embodiment of the present invention viewed in front of the pocket opening, wherein a clamping member is attached;

[0099] Fig.10 is Figure 8 a second side view of the retainer pocket in the embodiment of the present invention as viewed in front of the main opening of the pocket, with the clamping member attached;

[0100] Fig.10a It is along Fig.11 A partial cross-sectional view taken along line Xa-Xa in FIG.

[0101] Fig.11 yes Figure 8 A top view of the retaining member cavity in the embodiment of the present invention; and

[0102] Fig.12 is a cross-sectional view of the cutting tool in a secured position taken along a plane perpendicular to the longitudinal axis of the rib and passing through the anti-slip rib.

[0103] It will be appreciated that for simplicity and clarity of illustration, the elements shown in the figures are not necessarily drawn to scale. For example, the dimensions of some elements may be exaggerated relative to other elements for clarity, or multiple physical components may be included in one functional block or element. Where deemed appropriate, reference numerals may be repeated in the figures to indicate corresponding or similar elements. DETAILED DESCRIPTION

[0104] In the following description, various aspects of the subject matter of the present application will be described. For the purpose of illustration, specific configurations and details are fully elaborated in detail to provide a thorough understanding of the subject matter of the present application. However, it will also be apparent to those skilled in the art that the subject matter of the present application can be practiced without the specific configurations and details presented herein.

[0105] First note Figure 1 and Figure 2, which shows a cutting tool 20 for chip removal according to an embodiment of the subject matter of the present application. The cutting tool 20 has a cutting blade 22, which can generally be made of cemented carbide or ceramic. The cutting tool 20 also has a blade holder 24, which has a holder pocket 26. The blade holder 24 can typically be made of steel. In this non-limiting example, the cutting tool 20 is a rotary milling tool, and the cutting blade 22 is a milling blade. However, it should be noted that the subject matter of the present application is also applicable to other types of cutting tools and cutting blades, such as but not limited to turning tools and turning blades. The cutting tool 20 is adjustable between a release position and a tightening position. In the tightening position of the cutting tool 20, the cutting blade 22 is attached to the blade holder 24 in a releasable manner, for example, by a clamping member 28 that clamps the cutting blade 22 in the holder pocket 26.

[0106] Now refer to Figures 3 to 6 , which shows a cutting insert 22 according to the subject matter of the present application and relating to the first aspect of the present invention. The cutting insert 22 has an integral one-piece structure. The cutting insert 22 has an insert center axis A. The insert center axis A defines an opposite upward direction D U and downward direction D D The cutting insert 22 includes opposing upper and lower insert surfaces 30, 32 and an insert peripheral surface 34 extending between the upper and lower insert surfaces 30, 32. The upper and lower insert surfaces 30, 32 define the thickness of the cutting insert 22. The insert center axis A extends through (i.e., intersects) the upper and lower insert surfaces 30, 32. The cutting insert 22 has an insert midplane M oriented perpendicular to the insert center axis A and passing midway between the upper and lower insert surfaces 30, 32. See Figure 4 The cutting insert 22 has an insert height IH measured between an insert upper surface 30 and an insert lower surface 32 in the direction of the insert center axis A.

[0107] It should be noted that the terms "upwardly" and "downwardly" used throughout the specification and claims refer to Figure 4 and Figure 4a The relative positions of the longitudinal axis A of the tool blade in the vertically upward and vertically downward directions respectively.

[0108] Reference Figures 4 to 6According to some embodiments of the subject matter of the present application, the blade lower surface 32 may include a blade lower support surface 36. The blade lower support surface 36 is configured to contact a corresponding surface in the holder pocket 26 when the cutting blade 22 is seated in the holder pocket 26. The blade lower support surface 36 can be planar and oriented perpendicular to the blade center axis A. The blade upper surface 30 may include a blade upper clamping surface 38. The blade upper clamping surface 38 is configured to be clamped by the clamping member 28. Similar to the blade lower support surface 36, the blade upper clamping surface 38 can be planar and oriented perpendicular to the blade center axis A (i.e., parallel to the blade lower support surface 36).

[0109] The blade peripheral surface 34 extends circumferentially around the blade center axis A. The blade peripheral surface 34 includes at least one plane main blade side abutment surface 40. The at least one main blade side abutment surface 40 is configured to contact the corresponding surface in the holder cavity 26 when the cutting blade 22 is seated in the holder cavity 26. In this non-limiting example shown in the figure, the blade peripheral surface 34 includes exactly four main blade side abutment surfaces 40, and these four main blade side abutment surfaces 40 can allow the cutting blade 22 to be indexed on each side (four-way indexing). Each pair of adjacent main blade side abutment surfaces 40 can be perpendicular to each other. All main blade side abutment surfaces 40 can be identical to each other. In this configuration (as shown in the non-limiting example shown in the figure), the cutting blade 22 can have a rectangular basic shape, wherein the blade upper surface 30 and the blade lower surface 32 are non-circular.

[0110] According to some embodiments of the subject matter of the present application, the blade peripheral surface 34 may include at least one planar secondary blade side abutment surface 42, which is circumferentially spaced from the at least one primary blade side abutment surface 40 around the blade center axis A. In this non-limiting example shown in the figures, the blade peripheral surface 34 includes exactly four secondary blade side abutment surfaces 42. Each secondary blade side abutment surface 42 can be formed at a corresponding primary blade side abutment surface 40.

[0111] The cutting insert 22 includes at least one upper cutting edge 44. The at least one upper cutting edge 44 is formed at the intersection of the blade peripheral surface 34 and the blade upper surface 30. It should be noted that the at least one upper cutting edge 44 does not extend in the thickness direction of the cutting insert 22, which is different from the cutting edge disclosed in US7,121,769 351. Each upper cutting edge 44 is circumferentially displaced relative to a corresponding one of the at least one blade side abutment surfaces 40. In the case of a four-sided blade, each upper cutting edge 44 is circumferentially opposite to its corresponding blade side abutment surface 40 (by rotating 180° around the blade center axis A). According to some embodiments of the subject matter of the present application, the cutting insert 22 may include N upper cutting edges 44 spaced apart circumferentially around the blade center axis A, wherein N is a positive integer greater than 1. That is, the cutting insert 22 can be N-directionally indexable on the blade upper surface 30. Thus, in the case of a three-sided cutting insert, the upper cutting edge 44 will be circumferentially adjacent (through a 120° rotation about the insert centre axis A) to its corresponding side abutment surface.

[0112] According to some embodiments of the subject matter of the present application, the cutting insert 22 may include at least one lower cutting edge 46 formed at the intersection of the insert peripheral surface 34 and the insert lower surface 32. In this case, the cutting insert 22 is double-sided and can be seated in the retainer pocket 26 on either the insert upper bearing surface 36 and the insert lower bearing surface 38. In other words, the cutting insert 22 is "reversible" (i.e., it is capable of rotating 180° around the insert secondary axis I oriented perpendicular to the insert center axis A and contained in the insert middle plane M), so that the insert lower surface 32 becomes the insert upper surface 30, and the insert upper surface 30 becomes the insert lower surface 32. The cutting insert 22 may include the same number of lower cutting edges 46 as the upper cutting edges 44. Therefore, the cutting insert 22 may include N lower cutting edges 46 spaced circumferentially around the insert center axis A. That is, the cutting insert 22 may be N-directionally indexable on the insert lower surface 30.

[0113] The insert upper surface 30 includes at least one upper rake surface 48 extending along the at least one upper cutting edge 44. According to some embodiments of the subject matter of the present application, the at least one upper rake surface 48 can connect the at least one upper cutting edge 44 to the insert upper clamping surface 38. The insert peripheral surface 34 includes at least one upper relief surface 50 extending along the upper cutting edge 44. In a double-sided configuration, similarly, the insert lower surface 32 may include at least one lower rake surface 52, which may be configured and oriented in the same manner as the at least one upper rake surface 48. The insert peripheral surface 34 includes at least one lower relief surface 54 extending along the lower cutting edge 46.

[0114] The cutting insert 22 includes an anti-skid recess 56 recessed in the lower surface 32 of the insert, the anti-skid recess 56 defining a lower anti-skid recess 56a. The lower anti-skid recess 56a is primarily used to prevent the cutting insert 22 from sliding out of the retainer pocket 26. As a secondary function, the lower anti-skid recess 56a is used to give the following notification: the cutting insert 22 is in the correct indexable position in the retainer pocket 26. According to some embodiments of the subject matter of the present application, the lower anti-skid recess 56 can be centrally positioned on the lower surface 32 of the insert. The lower anti-skid recess 56a may not be open to the upper surface 30 of the insert. That is, the lower anti-skid recess 56a is a blind recess that is only open to the lower surface 32 of the insert at a single opening. According to some embodiments of the subject matter of the present application, the cutting insert 22 may include exactly one lower anti-skid recess 56a recessed in the lower surface 32 of the insert.

[0115] The lower anti-skid recess 56a includes at least one straight and elongated anti-skid groove 58. The at least one anti-skid groove 58 is designed to receive a complementary anti-skid rib located in the retainer pocket 26. The at least one anti-skid groove 58 has a groove longitudinal axis G. The at least one anti-skid groove 58 extends longitudinally along the corresponding groove longitudinal axis G. Preferably, the at least one anti-skid groove 58 can extend continuously along the corresponding groove longitudinal axis G, rather than having two (or more) spaced-apart sections. Each main blade side abutment surface 40 is oriented parallel to the groove longitudinal axis G of the corresponding anti-skid groove 58. According to some embodiments of the subject matter of the present application, the at least one anti-skid groove 58 can present a mirror symmetry about a first groove plane GP1, the first groove plane GP1 containing the groove longitudinal axis G and the blade center axis A. The at least one anti-skid groove 58 can present a mirror symmetry about a second groove plane GP2, the second groove plane GP2 is oriented perpendicular to the groove longitudinal axis G and contains the blade center axis A. Therefore, the at least one anti-skid groove 58 can present a bidirectional rotational symmetry about the blade center axis A. The at least one anti-skid groove 58 may be spaced apart from (i.e., not extend to) the blade peripheral surface 34. That is, the lower anti-skid recess 56a may be spaced apart from the blade peripheral surface 34. Thus, advantageously, the cutting insert 22, and in particular the blade peripheral surface 34, is not adversely weakened by the removal or absence of material forming the groove 58.

[0116] Each anti-skid groove 58 includes two opposite groove end portions 60 and a groove middle portion 62 located between the two opposite groove end portions 60. The two groove end portions 60 extend along the groove longitudinal axis G and are therefore "axially extending". The groove middle portion 62 intersects the blade center axis A.

[0117] like Figure 5 As seen in FIG. 5 , the anti-skid groove 58 may have a groove length GL that is less than the blade length IL, both of which are measured along the groove longitudinal axis G. In some embodiments, the groove length GL is between 20% and 80% of the blade length IL. Thus, in such an embodiment, the opposite end of the groove 58 (i.e., the groove terminal end 60) is spaced from the blade peripheral surface 34 by between 10% and 40% of the blade length IL. The anti-skid groove 58 also has a groove width GW measured in a direction perpendicular to the groove longitudinal axis G. In some embodiments, the groove width GW is between 10% and 40% of the groove length GL.

[0118] According to some embodiments of the subject matter of the present application, the at least one anti-skid groove 58 may include two opposite groove side walls 64 and a groove central surface 66 extending between the two opposite groove side walls 64. The two opposite groove side walls and the groove central surface 66 may all extend longitudinally in the direction of the groove longitudinal axis G. In other words, the two groove side walls 64 and the groove central surface 66 all extend between the two groove end portions 60. Figure 4a , in a cross-sectional view taken along the first groove plane GP1, the groove central surface 66 has a groove depth GD measured from the lower support surface 36 of the blade in the direction of the blade center axis A, and the groove depth GD can decrease in the direction away from the groove middle part 62 and toward the two groove end portions 60. Therefore, the groove depth GD can be maximum at the blade center axis A. The maximum groove depth GD can be less than 2mm. The maximum groove depth GD can be less than 20% of the blade height IH. In a cross-sectional view taken along the first groove plane GP1, the groove central surface 66 can be curved in a concave manner in the direction along the groove longitudinal axis G and can have a groove radius GR. In a cross-sectional view taken perpendicular to the groove longitudinal axis G (i.e., parallel to the second groove plane GP2) and through the plane of the at least one anti-skid groove 58, the two groove side walls 64 can converge with each other in the direction from the lower surface 30 of the blade toward the upper surface 32 of the blade.

[0119] Thus, the cutting insert 22 can be manufactured by pressing and allows the cutting insert 22 to be manufactured without any post-processing (e.g., grinding) to form the groove 56. As such, the groove 58 is a pressed groove 58 without marks formed by grinding (i.e., a non-ground groove). One of ordinary skill in the art can determine whether such a groove has been formed by grinding based on marks such as surface smoothness and / or the presence of wear marks. In addition, the pressed groove has no undercut in the direction of the insert center axis A.

[0120] According to some embodiments of the subject matter of the present application, the lower anti-skid recess 56a may include M anti-skid grooves 58, wherein M is a positive integer. The number of anti-skid grooves 58 determines the number of indexable positions that the cutting blade 22 has on each side (i.e., on the lower surface 30 of the blade or the upper surface 32 of the blade) when it is seated in the retainer cavity 26. When the number N of cutting edges is an even number, M can be equal to N / 2. Therefore, each anti-skid groove 58 allows two indexable positions. When N is an odd number, M can be equal to N. Therefore, each anti-skid groove 58 allows one indexable position. In a configuration in which one of the faces of the anti-skid groove 58 has an anti-skid groove 58, the one anti-skid groove 58 can have the appearance of a negative mathematical symbol.

[0121] According to some embodiments of the subject matter of the present application, the lower anti-skid recess 56a may include a plurality of anti-skid grooves 58 (i.e., M>=2). In such a configuration, the plurality of anti-skid grooves 58 all intersect with each other at the groove middle portion 62. It should be noted that the groove middle portion 62 of any anti-skid groove 58 is common to all other anti-skid grooves 58. The plurality of anti-skid grooves 58 may be identical. The plurality of anti-skid grooves 58 may be arranged at equal angles around the blade center axis A and intersect with each other. In particular, the plurality of anti-skid grooves 58 may be arranged so that the lower anti-skid recess 56a may present rotational symmetry about the blade center axis A.

[0122] In the double-sided configuration of the cutting blade 22, according to some embodiments of the subject matter of the present application, the cutting blade 22 may include an additional anti-skid recess 56 recessed in the blade upper surface 30, and the additional anti-skid recess 56 defines an upper anti-skid recess 56b. It should be noted that all features related to the lower anti-skid recess 56a described herein can be applied to the upper anti-skid recess 56b. The upper anti-skid recess 56b can be the same as the lower anti-skid recess 56a. The upper anti-skid recess 56b can be spaced apart from the lower anti-skid recess 56a (i.e., not connected to the lower anti-skid recess 56a). Like the lower anti-skid recess 56a, the cutting blade 22 may include exactly one upper anti-skid recess 56b recessed in the blade upper surface 30.

[0123] Furthermore, in a double-sided configuration of the cutting insert 22, according to some embodiments of the subject matter of the present application, the cutting insert 22 may include exactly two upper cutting edges 44 and exactly two lower cutting edges 46 ( Figure 7 ). The cutting insert 22 is bidirectionally indexable on each side. The insert peripheral surface 34 may include a plurality of curved corner surfaces 68, which alternate with a plurality of main insert side abutment surfaces 40 in the circumferential direction. Each of the lower anti-skid recess 56a and the upper anti-skid recess 56b may include exactly one anti-skid groove 58. The anti-skid groove 58 at the lower anti-skid recess 56a may be oriented to be perpendicular to the anti-skid groove 58 at the upper anti-skid recess 56b. Therefore, the lower anti-skid recess 56a and the upper anti-skid recess 56b are not aligned in the view along the insert center axis A. This prevents the user from attaching the cutting insert 22 to the retainer pocket 26 in an incorrect position.

[0124] According to some other embodiments of the present subject matter, the cutting insert 22 may include exactly four upper cutting edges 44 ( Figure 3). Thus, the cutting insert 22 is four-way indexable on the lower surface 32 of the insert. The lower anti-skid recess 56a may include exactly two anti-skid grooves 58 oriented perpendicularly to each other. The two anti-skid grooves 58 may form a cross shape. The two anti-skid grooves 58 may have the appearance of a plus mathematical symbol. In a double-sided configuration, the cutting insert 22 may include exactly four lower cutting edges 46. The upper anti-skid recess 56b may include exactly two anti-skid grooves 58 oriented perpendicularly to each other. Each anti-skid groove 58 at the lower anti-skid recess 56a may be oriented parallel to the corresponding anti-skid groove 58 at the upper anti-skid recess 56b. Thus, the lower anti-skid recess 56a and the upper anti-skid recess 56b may be aligned in a view along the center axis A of the insert.

[0125] A second aspect of the subject matter of the present application relates to the blade holder 24. Note Figures 8 to 10 The blade holder 24 has an opposite forward direction D F and backward direction D R The blade holder 24 includes a holder major surface 70 that intersects a holder end surface 72. The holder major surface 70 extends circumferentially around the holder longitudinal axis H. The holder end surface 72 intersects the holder longitudinal axis H and faces generally in the forward direction D. F .

[0126] It should be noted that the terms "forward" and "backward" used throughout the specification and claims refer to Fig.10 The longitudinal axis B of the tool holder is respectively vertically upward and downward (and toward and away from Fig. 9 and Fig.11 In general, the forward direction D F This is the direction toward the cutting insert 22 .

[0127] The blade holder 24 includes a holder pocket 26 for attaching the cutting blade 22 in a releasable manner in the holder pocket 26. The holder pocket 26 has a pocket main axis B. The holder pocket 26 has an integral one-piece structure. The holder pocket 26 is recessed in the holder main surface 70. The holder pocket 26 opens to the holder main surface 70 at the pocket main opening 74. According to some embodiments of the subject matter of the present application, the holder pocket 26 can be opened to the pocket outer lateral surface 76 of the blade holder 24 at the pocket secondary opening 78. In the non-limiting example shown in the figure, the pocket outer lateral surface 76 can be formed at the holder end surface 72. Alternatively, the blade holder 24 may include a peripheral recess (not shown) adjacent to the holder pocket 26, which is recessed in the holder main surface 70 and opens to the holder main surface 70. The pocket outer lateral surface 76 can be formed at the peripheral recess. The holder longitudinal axis H and the cavity main axis B may not be parallel to each other. The holder longitudinal axis H may be inclined relative to the cavity main axis B.

[0128] The holder pocket 26 includes a pocket base surface 82 and a pocket peripheral surface 84. The pocket peripheral surface 84 is oriented generally perpendicular to the pocket base surface 82 and forms a portion of the pocket base surface 82. The pocket base surface 82 is not bounded by the pocket peripheral surface 84 at the pocket primary opening 74, and optionally at the pocket secondary opening 78 if present. The pocket base surface 82 intersects the pocket primary axis B.

[0129] Reference Figures 8 to 10 , the pocket base surface 82 includes at least one pocket support surface 86. The at least one pocket support surface 86 is configured to contact a corresponding surface in the cutting insert 22 when the cutting insert 22 is seated in the at least one pocket support surface 86. According to some embodiments of the subject matter of the present application, the at least one pocket support surface 86 can be planar and oriented perpendicular to the pocket main axis B.

[0130] The pocket peripheral surface 84 extends circumferentially about the pocket major axis B. The pocket peripheral surface 84 includes a planar main pocket side abutment surface 88 positioned opposite and facing the pocket main opening 74. The main pocket side abutment surface 88 is configured for contacting a corresponding surface in the cutting insert 22 when the cutting insert 22 is seated in the main pocket side abutment surface 88.

[0131] According to some embodiments of the subject matter of the present application, the pocket peripheral surface 84 may also include a planar secondary pocket side abutment surface 90 that is circumferentially spaced from the primary pocket side abutment surface 88 about the pocket major axis B. The secondary pocket side abutment surface 90 is configured to contact a corresponding surface in the cutting insert 22 when the cutting insert 22 is seated in the secondary pocket side abutment surface 90. The secondary pocket side abutment surface 90 may be located opposite the pocket secondary opening 78. The secondary pocket side abutment surface 90 may be oriented perpendicular to the primary pocket side abutment surface 88.

[0132] According to some embodiments of the subject matter of the present application, the retainer pocket 26 may include a pocket overhang portion 92 formed integrally with the retainer pocket 26. The pocket overhang portion 92 may overhang the pocket base surface 82. The pocket major axis B may intersect the pocket overhang portion 92. The pocket overhang portion 92 may overhang the pocket base surface 82 to such an extent that it would hinder access to a retaining screw that is used to threadably engage a threaded hole in the pocket base surface 82 to releasably clamp the cutting insert 22 in the retainer pocket 26. Therefore, the retainer pocket 26 may not have a threaded hole opening to the pocket base surface 82 because the retaining screw cannot be used for clamping purposes.

[0133] According to some embodiments of the subject matter of the present application, the pocket overhang portion 92 may include an overhanging inner surface 94 facing the pocket base surface 82. The overhanging inner surface 94 may be planar and parallel to the at least one pocket support surface 86. The pocket overhang portion 92 may include an overhanging lateral surface 96 intersecting the overhanging inner surface 94 and oriented transversely to the overhanging inner surface 94. In general, the overhanging lateral surface 96 may be formed on the retainer major surface 70. Preferably, the overhanging lateral surface 96 may be concave (i.e., inclined toward the retainer longitudinal axis H).

[0134] Reference Figure 2 and Fig.11 . Instead of a retaining screw passing through the cutting insert 22, according to some embodiments of the subject matter of the present application, the retainer pocket 26 may include a pocket threaded hole 98 designed to receive the clamping member 28 in a threaded manner to secure the cutting insert 22 to the insert holder 24. The pocket threaded hole 98 may be recessed in at least the overhanging lateral surface 96 and open to at least the overhanging lateral surface 96. Optionally, the pocket threaded hole 98 may also open to the overhanging inner surface 94. The pocket threaded hole 98 extends along the threaded hole axis S. The threaded hole axis S and the pocket main axis B may not be parallel to each other. That is, the threaded hole axis S may be inclined relative to the pocket main axis B.

[0135] The retainer pocket 26 includes an elongated and straight anti-skid rib 100 protruding from the pocket base surface 82. The anti-skid rib 100 is designed to be received in a corresponding one of the anti-skid grooves 58. The anti-skid rib 100 has a rib longitudinal axis R. The anti-skid rib 100 extends longitudinally along the rib longitudinal axis R. Preferably, the anti-skid rib 100 can extend continuously along the rib longitudinal axis R. The main pocket side abutment surface 88 is oriented parallel to the rib longitudinal axis R. Therefore, advantageously, when manufacturing the main pocket side abutment surface 88, there is no need to reconfigure the rotation angle of the rotary cutting tool (for manufacturing the anti-skid rib 100) (or, when manufacturing the anti-skid rib 100, there is no need to reconfigure the rotation angle of the rotary cutting tool for manufacturing the main pocket side abutment surface 88).

[0136] According to some embodiments of the subject matter of the present application, the anti-skid rib 100 may present mirror symmetry about a first rib plane RP1, which contains the rib longitudinal axis R and the main hole axis B. The anti-skid rib 100 may present mirror symmetry about a second rib plane RP2, which is oriented perpendicular to the rib longitudinal axis R and contains the main hole axis B. Therefore, the anti-skid rib 100 may be bidirectionally (180°) rotationally symmetrical about the main hole axis B. The anti-skid rib 100 may be spaced apart from the secondary hole side abutment surface 90 (i.e., not extending to the secondary hole side abutment surface 90). Similarly, the anti-skid rib 100 may be spaced apart from the secondary hole opening 78. The rib longitudinal axis R may be parallel to the retainer longitudinal axis H.

[0137] The anti-slip rib 100 comprises two opposite rib end portions 102 and a rib middle portion 104 located between the two opposite rib end portions 102. The two rib end portions 102 extend along the rib longitudinal axis R and are thus "axially extending". The rib middle portion 104 intersects the pocket main axis B.

[0138] According to some embodiments of the subject matter of the present application, the anti-skid rib 100 may include two rib side walls 106 and a rib central surface 108 extending between the two rib side walls 106. The two rib side walls 106 and the rib central surface 108 may all extend longitudinally in the direction of the rib longitudinal axis R. In other words, the two rib side walls 106 and the rib central surface 108 all extend between the two rib end portions 102. The anti-skid rib may have a shape corresponding to the corresponding anti-skid groove 58. For example, in a cross-sectional view taken along the first rib plane RP1, the rib central surface 108 has a rib height RH measured from the hole support surface 86 in the direction of the hole main axis B, and the rib height RH may decrease in a direction away from the rib middle portion 104 to any one of the two rib end portions 102 (see Fig.10a). Therefore, the rib height RH is maximum at the cavity main axis B. The maximum rib height RH may be less than 2 mm. In a cross-sectional view taken along the first rib plane RP1, the rib central surface 108 may be curved in a convex manner in the direction along the rib longitudinal axis R and have a rib radius RR. In a cross-sectional view taken along a plane perpendicular to the rib longitudinal axis R (i.e. parallel to the second rib plane RP2) and passing through the anti-slip rib 100, the two rib side walls 106 may converge with each other in a direction away from the cavity base surface 82 and toward the cavity overhang portion 92.

[0139] According to some embodiments of the subject matter of the present application, the at least one pocket support surface 86 may include exactly two coplanar pocket support surfaces 86 located on opposite sides of the anti-slip rib 100 .

[0140] Will refer to Figure 1 , Figure 2 and Fig.11 The seating and support of the cutting insert 22 in the holder pocket 26 is described. In the tightened position of the cutting tool 20, the cutting insert 22 is releasably retained in the holder pocket 26 of the insert holder 24. In the non-limiting example shown in the figures, the clamping member 28 includes a clamping male threaded portion 110 and a clamping female portion 112. Figure 2 As seen in the figure, the clamping male threaded portion 110 can have a first end configured to engage with the hole with threaded hole 98 and a second end configured to engage with the clamping female portion 112. According to some embodiments of the subject matter of the present application, the clamping male threaded portion 110 and the clamping female portion 112 can be attached to each other in a threaded manner. The clamping threaded portion 110 can be spaced apart from the clamping non-threaded portion 112 along the longitudinal axis of the clamping member.

[0141] The cutting insert 22 is releasably held to the insert holder 24 by a clamping male threaded portion 110 which is threadably received in the hole threaded hole 98 and a clamping female portion 112 which abuts against the insert upper surface 30 when clamped. It should be noted that in this clamping configuration, the cutting insert 22 may not have a through hole (of the type disclosed in US Pat. No. 7,645,100) which opens to the insert upper surface 30 and the insert lower surface 32 for accommodating a retaining screw. The insert center axis A and the hole main axis B may coincide. Therefore, the hole base surface 82 faces in the upward direction D. U .

[0142] Reference Fig.11, which shows a cross-sectional view of the cutting tool 20 in an assembled position, taken along a plane perpendicular to the rib longitudinal axis R and passing through the anti-slip rib 100, wherein the at least one pocket support surface 86 is adjacent to the insert lower bearing surface 36. The main pocket side abutment surface 88 is adjacent to the "operative" main insert side abutment surface 40. The anti-slip rib 100 is located in an "operative" anti-slip groove 58, which is oriented parallel to the main insert side abutment surface 40 adjacent to the main pocket side abutment surface 88. This prevents the cutting insert 22 from sliding out of the retainer pocket 28 in a radially outward direction (relative to the retainer longitudinal axis H) during operation. However, replacement or indexing of the cutting insert 22 is allowed by displacing the cutting insert 22 in the direction of the rib longitudinal axis R. In the configuration of the lower anti-skid recess 56a including a plurality of anti-skid grooves 58, the groove end portion 60 of the anti-skid groove 58 oriented transversely to (e.g., not parallel to) the main hole side abutment surface 88 may not be occupied. In other words, the "non-operative" anti-skid groove 58 is considered to be unoccupied (even if the common groove middle portion 62 has an anti-skid rib 100).

[0143] According to some embodiments of the subject matter of the present application, the secondary pocket side abutment surface 90 may abut the "operating" secondary blade side abutment surface 42. And even though the anti-skid rib 100 may be located in the operating anti-skid groove 58, the anti-skid rib 100 may not abut the operating anti-skid groove 58. Thus, an overly constrained positioning relative to the abutment between the primary pocket side abutment surface 88 and the corresponding primary blade side abutment surface 40 is avoided.

[0144] It should also be noted that the above-mentioned anti-skid groove is particularly suitable for ceramic inserts. For example, the groove central surface 66 can be configured to have a radius and / or shallow depth to reduce tool stress during the cutting operation. In addition, the cutting insert 22 may not have a through hole of the type for receiving a retaining screw.

[0145] Although the subject matter of this application has been described with a certain degree of particularity, it will be appreciated that various changes and modifications could be made without departing from the spirit or scope of the invention as hereinbefore claimed.

Claims

1. A cutting tool (20), comprising: The cutting blade (22) has a pair of opposite upward directions (D U ) and downward direction (D D ) is defined by a blade center axis (A), the cutting blade (22) comprising: Opposing upper blade surfaces (30) and lower blade surfaces (32) and a blade peripheral surface (34) extending between the upper blade surface (30) and the lower blade surface (32), the blade peripheral surface (34) extending circumferentially around the blade central axis (A) and including at least one planar primary blade side abutment surface (40); at least one upper cutting edge (44) formed at the intersection of the insert peripheral surface (34) and the insert upper surface (30) and circumferentially displaced relative to the at least one main insert side abutment surface (40); and An anti-slip recess (56) is recessed in the blade lower surface (32), the anti-slip recess (56) defines a lower anti-slip recess (56a), the lower anti-slip recess (56a) includes at least one elongated and straight anti-slip groove (58), the at least one anti-slip groove (58) having: The longitudinal axis of the groove (G); a first groove plane (GP1), the first groove plane (GP1) containing the groove longitudinal axis (G) and the insert center axis (A); a second groove plane (GP2), the second groove plane (GP2) being perpendicular to the first groove plane (GP1) and containing the insert center axis (A); and Two opposite axially extending groove end portions (60) and a groove middle portion (62) located between the two opposite axially extending groove end portions (60), wherein the groove middle portion (62) intersects with the blade center axis (A); wherein, The cutting insert (22) is free of through holes opening to the insert upper surface (30) and the insert lower surface (32) to receive a retaining screw; and Each primary blade side abutment surface (40) is oriented parallel to the groove longitudinal axis (G) of the corresponding anti-skid groove (58); and The blade holder (24) has a blade holder (24) with a forward direction (D F ) and backward direction (D R ) defines a longitudinal axis (H) of the holder, and the blade holder (24) comprises: a retainer major surface (70) intersecting a retainer end surface (72); and A retainer pocket (26) recessed in the retainer major surface (70) and opening to the retainer major surface (70) at a pocket major opening (74), the retainer pocket (26) having a pocket major axis (B) and comprising: Surface of the base of the hole (82); a pocket peripheral surface (84) oriented generally perpendicular to the pocket base surface (82) and forming a partial boundary of the pocket base surface (82), the pocket base surface (82) not being bounded by the pocket peripheral surface (84) at the pocket main opening (74), the pocket peripheral surface (84) extending circumferentially about the pocket main axis (B) and including a planar main pocket side abutment surface (88) positioned opposite and facing the pocket main opening (74); and An elongated and straight anti-skid rib (100) protrudes from the pocket base surface (82), the anti-skid rib (100) extending longitudinally along a rib longitudinal axis (R) and comprising: a first rib plane (RP1 ), said first rib plane (RP1 ) containing said rib longitudinal axis (R) and said pocket main axis (B); and a second rib plane (RP2), the second rib plane (RP2) being perpendicular to the first rib plane (RP1) and containing the cavity main axis (B); wherein: The main cavity side abutment surface (88) is oriented parallel to the rib longitudinal axis (R); wherein: The cutting tool (20) is adjustable between a release position and a tightening position; and In the fastening position of the cutting tool (20): The cutting blade (22) is releasably retained in the retainer pocket (26); The main hole side abutment surface (88) is adjacent to the main blade side abutment surface (40) for operation; at least one pocket support surface (86) on the pocket base surface (82) is adjacent to a lower blade support surface (36) on the lower blade surface (32); and The anti-skid rib (100) is located in an anti-skid groove (58) for operation, and the anti-skid groove (58) for operation is oriented parallel to the main blade side abutment surface (40) for operation; The cutting insert (22) is N-indexable on the insert upper surface (30) to provide notification that the cutting insert is in a correct indexable position in the holder pocket.

2. The cutting tool (20) according to claim 1, wherein: The at least one upper cutting edge (44) comprises N upper cutting edges (44) spaced apart circumferentially around the insert center axis (A), N being a positive integer greater than 1; and The at least one anti-skid groove (58) comprises M anti-skid grooves (58), wherein when N is an even number, M=N / 2, or when N is an odd number, M=N.

3. The cutting tool (20) according to claim 1, wherein: The lower anti-slip recess (56a) comprises a plurality of anti-slip grooves (58) which are arranged at equal angles around the central axis (A) of the blade and intersect with each other.

4. The cutting tool (20) according to claim 3, wherein: The plurality of anti-slip grooves (58) are identical.

5. The cutting tool (20) according to claim 1, wherein: The lower anti-slip recess (56a) presents rotational symmetry about the blade center axis (A).

6. The cutting tool (20) according to claim 1, wherein: The at least one anti-slip groove (58) exhibits mirror symmetry about the first groove plane (GP1), and also exhibits mirror symmetry about the second groove plane (GP2).

7. The cutting tool (20) according to claim 1, wherein: The at least one anti-skid groove (58) is spaced apart from the blade peripheral surface (34).

8. The cutting tool (20) according to claim 1, wherein: The at least one anti-skid groove (58) includes two opposite groove side walls (64) and a groove central surface (66) extending between the two opposite groove side walls (64), wherein the two opposite groove side walls (64) and the groove central surface (66) all extend longitudinally along the groove longitudinal axis (G); and In a cross-sectional view taken along the first groove plane (GP1), the groove central surface (66) decreases in depth in a direction away from the groove middle portion (62) and toward the two groove end portions (60).

9. The cutting tool (20) according to claim 8, wherein: The groove central surface (66) is curved in a concave manner in a direction along the groove longitudinal axis (G) and has a groove radius (GR).

10. The cutting tool (20) according to claim 8, wherein: In a cross-sectional view taken along a plane perpendicular to the groove longitudinal axis (G) and passing through the at least one anti-skid groove (58), the two groove side walls (64) converge toward each other in a direction from the blade lower surface (32) toward the blade upper surface (30).

11. The cutting tool (20) according to claim 1, wherein the cutting insert (22) further comprises: at least one lower cutting edge (46) formed at the intersection of the insert peripheral surface (34) and the insert lower surface (32); and An additional anti-slip recess (56) is recessed in the blade upper surface (30), the additional anti-slip recess (56) defines an upper anti-slip recess (56b), and the upper anti-slip recess (56b) and the lower anti-slip recess (56a) have the same number of anti-slip grooves (58).

12. The cutting tool (20) according to claim 11, wherein The cutting blade (22) includes exactly two upper cutting edges (44) and exactly two lower cutting edges (46); The upper anti-slip recess (56b) and the lower anti-slip recess (56a) each include exactly one anti-slip groove (58); and The anti-slip groove (58) at the lower anti-slip recess (56a) is oriented perpendicular to the anti-slip groove (58) at the upper anti-slip recess (56b).

13. The cutting tool (20) according to claim 1, wherein: The cutting insert (22) comprises exactly four upper cutting edges (44); The lower anti-slip recess (56a) includes exactly two anti-slip grooves (58) oriented perpendicularly to each other.

14. The cutting tool (20) according to claim 1, wherein: The anti-slip rib (100) comprises two opposite axially extending rib end portions (102) and a rib middle portion (104) located between the two opposite axially extending rib end portions (102), wherein the rib middle portion (104) intersects with the cavity main axis (B).

15. The cutting tool (20) according to claim 1, wherein The retainer hole (26) includes a hole suspension portion (92), the hole suspension portion (92) is formed as a whole with the retainer hole (26), the hole suspension portion (92) is suspended on the hole base surface (82), and the hole main axis (B) intersects with the hole suspension portion (92).

16. The cutting tool (20) according to claim 1, wherein The pocket peripheral surface (84) further includes a planar secondary pocket side abutment surface (90) that is circumferentially spaced from the primary pocket side abutment surface (88) about the pocket major axis (B).

17. The cutting tool (20) according to claim 16, wherein: The anti-slip rib (100) is spaced apart from the secondary pocket side abutment surface (90).

18. The cutting tool (20) according to claim 16, wherein: The holder pocket (26) opens to the pocket outer lateral surface (76) of the blade holder (24) at a pocket secondary opening (78) opposite the pocket secondary side abutment surface (90), and the pocket base surface (82) is not bounded by the pocket peripheral surface (84) at the pocket secondary opening (78).

19. The cutting tool (20) according to claim 18, wherein The anti-slip rib (100) is spaced apart from the hole pair opening (78).

20. The cutting tool (20) according to claim 1, wherein The anti-slip rib (100) exhibits mirror symmetry about the first rib plane (RP1) and also exhibits mirror symmetry about the second rib plane (RP2).

21. The cutting tool (20) according to claim 14, wherein: The anti-slip rib (100) comprises two rib side walls (106) and a rib central surface (108) extending between the two rib side walls (106), wherein the two rib side walls (106) and the rib central surface (108) all extend longitudinally in the direction of the rib longitudinal axis (R); as well as In a cross-sectional view taken along the first rib plane (RP1), the rib central surface (108) decreases in height in a direction away from the rib middle portion (104) and towards the two rib terminal portions (102).

22. The cutting tool (20) according to claim 21, wherein The rib central surface (108) is curved in a convex manner in a direction along the rib longitudinal axis (R) and has a rib radius (RR).

23. The cutting tool (20) according to claim 22, wherein: The retainer hole (26) includes a hole suspension portion (92), which is formed as a whole with the retainer hole (26), and the hole suspension portion (92) is suspended on the hole base surface (82). In a cross-sectional view taken along a plane perpendicular to the rib longitudinal axis (R) and passing through the anti-slip rib (100), the two rib side walls (106) converge with each other in a direction away from the hole base surface (82) and toward the hole suspension portion (92).

24. The cutting tool (20) according to claim 1, wherein The retainer pocket (26) lacks a threaded hole opening to the pocket base surface (82) for threadably engaging a retaining screw.

25. The cutting tool (20) according to claim 1, wherein The lower anti-slip recess (56a) includes a plurality of anti-slip grooves (58); and In the fastening position of the cutting tool (20): Any anti-skid groove (58) oriented non-parallel to the main pocket side abutment surface (88) operating on is unoccupied.

26. The cutting tool (20) according to claim 1, wherein In the fastening position of the cutting tool (20): The anti-skid rib (100) is not adjacent to the anti-skid groove (58) in operation.

Images