Double-sided cutting insert and milling tool

Abstract

A double-sided cutting insert for milling, comprising: - first and second major faces (2, 3); - a peripheral surface (10) arranged between the major faces (2, 3) and comprising a first major flank face (11); - a first major cutting edge (21) formed at the intersection between the first major flank face and the first major face; - a second major cutting edge (22) formed at the intersection between the first major flank face and the second major face; - first and second inclined side surfaces (31, 32) formed on the first major flank face (11) and inclined towards each other to form a depression (D1) on the first major flank face; and - a chip deflecting member (50) formed on the first major flank face in the form of a protrusion through the depression (D1) and comprising a chip deflecting surface (51) configured to deflect a chip hitting the first major flank face away from the depression.

Description

Technical Field

[0001] This invention relates to a double-sided cutting insert for milling. The invention also relates to a milling tool comprising such a double-sided cutting insert. Background Technology

[0002] Milling cutters are rotary cutting tools that may be provided with one or more cutting inserts detachably mounted in corresponding insert holders within the tool body of the milling cutter. The cutting inserts may have a basic polygonal shape and may be provided with several identical cutting edges, allowing each individual cutting insert to be rotated to different working positions. When the cutting edge of a cutting insert has worn, the cutting insert can be repositioned in its insert holder and installed in a new working position, while another cutting edge is in an active cutting position. Such cutting inserts may, for example, be in the form of double-sided cutting inserts, having one or more primary cutting edges positioned along the outer periphery of a first principal face of the cutting insert, and one or more corresponding primary cutting edges positioned along the outer periphery of an opposing second principal face of the cutting insert, wherein the first and second principal faces serve as the top and bottom faces of the cutting insert.

[0003] The type of double-sided cutting insert described above is known in various configurations, and examples of such cutting inserts are disclosed, for example, in US 2014 / 0212229 A1 and EP 2 596 889 A1. Summary of the Invention

[0004] The purpose of this invention

[0005] The object of the present invention is to provide a double-sided cutting insert of the above type, which has a new and advantageous design.

[0006] Overview of the Invention

[0007] According to the present invention, the objective is achieved by a double-sided cutting insert having the following defined features.

[0008] The double-sided cutting insert according to the present invention has a polygonal basic shape and is capable of rotating to different working positions, and includes:

[0009] - A first main surface and a second main surface, the first main surface and the second main surface are arranged on opposite sides of the cutting insert and serve as the top surface and bottom surface of the cutting insert, and each of the first main surface and the second main surface has a polygonal shape when viewed in a plan view of the cutting insert;

[0010] - A central axis that extends between the first main surface and the second main surface;

[0011] - An outer peripheral surface that extends around the cutting blade between the first main surface and the second main surface, and includes at least a first main side surface that forms a first outer peripheral side surface of the cutting blade;

[0012] - A first primary cutting edge, which is formed at the intersection between the first primary side surface and the first primary surface;

[0013] - A second primary cutting edge, formed at the intersection between the first primary side surface and the second primary surface; and

[0014] - A first inclined side surface and a second inclined side surface are formed on the first main side surface, wherein the first inclined side surface is located between the first main surface and the second inclined side surface and is configured to form a clearance surface for the first main cutting edge in a first working position of the working position, and the second inclined side surface is located between the second main surface and the first inclined side surface and is configured to form a clearance surface for the second main cutting edge in a second working position of the working position, wherein the first inclined side surface is inclined inward when viewed from a first edge facing the first main surface toward a opposite second edge facing the second inclined side surface, and the second inclined side surface is inclined inward when viewed from a first edge facing the second main surface toward a opposite second edge facing the second inclined side surface, wherein the first inclined side surface and the second inclined side surface are positioned relative to each other and inclined toward each other, thereby forming a recess on the first main side surface between the first main cutting edge and the second main cutting edge; and

[0015] - A first chip deflection member formed on the first main side surface, in the form of a protrusion extending through the recess formed by the first inclined side surface and the second inclined side surface, wherein the first chip deflection member has a first end facing the first main cutting edge, an opposing second end facing the second main cutting edge, and at least a first chip deflection surface extending between the first end and the second end, and the first chip deflection surface is configured to deflect chips impacting the first main side surface away from the recess; and wherein each of the first inclined side surface and the second inclined side surface includes a first sub-surface located on a first side of the first chip deflection member and a second sub-surface located on an opposing second side of the first chip deflection member.

[0016] The first and second sub-surfaces of the first inclined side surface are preferably arranged in the same plane. The first and second sub-surfaces of the second inclined side surface are preferably arranged in the same plane.

[0017] The aforementioned polygonal basic shape of the cutting insert means that, when viewed in the circumferential direction, the cutting insert has several different and distinct sides that are interconnected by intermediate corner regions, and these sides, together with the intermediate corner regions, form the outer peripheral surface of the cutting insert. Therefore, the polygonal basic shape of the cutting insert means that, when viewed in a cross-section perpendicular to the central axis of the cutting insert, the body of the cutting insert has a non-circular and non-elliptical shape.

[0018] When the cutting insert is mounted in the insert holder within the tool body of the milling cutter and positioned in the first working position, the first primary cutting edge is positioned to form an active primary cutting edge within the milling cutter, and the first inclined side surface is positioned to form a clearance surface for this active primary cutting edge. When the cutting insert is mounted in the insert holder and positioned in the second working position, the second primary cutting edge is positioned to form an active primary cutting edge within the milling cutter, and the second inclined side surface is positioned to form a clearance surface for this active primary cutting edge. In both working positions, the first primary side surface, having both the first and second inclined side surfaces, is radially outward within the tool body. This means that when the active primary cutting edge contacts the workpiece, chips generated by the rotating milling cutter during milling may scrape against the first primary side surface during that portion of each revolution, or when the active primary cutting edge disengages from the workpiece, multiple chips or chips formed by the active primary cutting edge may impact the first primary side surface at that time. Chips impacting the first primary side can cause harmful erosion of the beveled side surface closest to the non-functional primary cutting edge, and may also damage the non-functional primary cutting edge. Damage to the non-functional primary cutting edge can reduce the life of the cutting insert and, in the worst case, render it unusable later. If the beveled side surface closest to the non-functional primary cutting edge is configured to serve as the abutment surface of the cutting insert in another working position and abut against a corresponding support surface in the insert holder within the tool body, severe erosion of the beveled side surface can lead to improper installation of the cutting insert in the insert holder when the cutting insert is subsequently positioned in the working position and the eroded beveled side surface serves as the working abutment surface. The chip deflection mechanism described above will deflect chips impacting the first primary side away from the beveled side surface closest to the non-functional primary cutting edge, thereby reducing erosion of the beveled side surface and reducing chip-induced damage to the non-functional primary cutting edge.

[0019] The aforementioned central axis of the cutting insert extends between the center point of the first principal face and the center point of the second principal face. The center point refers to the centroid or geometric center. The cutting insert may be provided with a through hole that extends centrally through the cutting insert between the first and second principal faces, wherein the central axis of the through hole coincides with the central axis of the cutting insert.

[0020] According to an embodiment of the present invention, the first chip deflection member includes a second chip deflection surface and a third chip deflection surface disposed on opposite sides of the first chip deflection surface. The second chip deflection surface is inclined outward from the first chip deflection surface and abuts the first sub-surface of the first inclined side surface and the first sub-surface of the second inclined side surface. The third chip deflection surface is inclined outward from the first chip deflection surface and abuts the second sub-surface of the first inclined side surface and the second sub-surface of the second inclined side surface. The inclined second and third chip deflection surfaces help the first chip deflection surface deflect chips impacting the first main side surface away from the depression formed by the first and second inclined side surfaces.

[0021] Another embodiment of the present invention is characterized in that:

[0022] - The first chip deflection surface has a first longitudinal edge extending between the first end and the second end of the first chip deflection member and an opposing second longitudinal edge extending between the first end and the second end of the first chip deflection member;

[0023] - The second chip deflection surface is adjacent to the first longitudinal edge of the first chip deflection surface and extends completely along the first longitudinal edge of the first chip deflection surface; and

[0024] - The third chip deflection surface is adjacent to the second longitudinal edge of the first chip deflection surface and extends completely along the second longitudinal edge of the first chip deflection surface.

[0025] Therefore, the first chip deflection surface, the second chip deflection surface, and the third chip deflection surface can cover all the outer and exposed sides of the first chip deflection member.

[0026] To accommodate the shape of the recess formed by the first and second inclined side surfaces, the first chip deflection surface may have a parallelogram shape, and the second and third chip deflection surfaces may be triangular.

[0027] According to another embodiment of the invention, the first primary side has 180° rotational symmetry about an imaginary reference axis that extends through the center point of the first primary side and perpendicular to the central axis of the cutting blade.

[0028] Another embodiment of the present invention is characterized in that:

[0029] - In the first working position, the clearance surface formed by the first inclined side surface is configured to serve as an auxiliary clearance surface for the first main cutting edge, wherein the first main clearance surface is formed on the first main side surface, the first main clearance surface is adjacent to the first main cutting edge and located between the first main cutting edge and the first inclined side surface, thereby serving as the main clearance surface for the first main cutting edge in the first working position; and

[0030] - In the second working position, the clearance surface formed by the second inclined side surface is configured to serve as an auxiliary clearance surface for the second main cutting edge, wherein the second main clearance surface is formed on the first main side surface, the second main clearance surface is adjacent to the second main cutting edge and is located between the second main cutting edge and the second inclined side surface, thereby serving as the main clearance surface for the second main cutting edge in the second working position.

[0031] In this configuration, the first chip deflection surface preferably abuts the first main gap surface at the first end of the first chip deflection member and the second main gap surface at the second end of the first chip deflection member. This means that the gap between the first and second main gap surfaces formed by the aforementioned recess is spanned by the first chip deflection member. Therefore, the first chip deflection member can effectively deflect chips impacting the first main side away from the recess between the first and second main gap surfaces.

[0032] According to another embodiment of the invention, the cutting insert has an intermediate plane extending halfway between the first main face and the second main face, perpendicular to the central axis of the cutting insert. Each of the first and second main clearance surfaces is perpendicular to the intermediate plane when viewed in a cross-section of the cutting insert's central plane, which is parallel to the center point of the central axis of the cutting insert and the center point of the first main face. Alternatively, the first main clearance surface may be tilted outwards when viewed from a first longitudinal edge facing the first main cutting edge or coinciding with the first main cutting edge toward a opposite second longitudinal edge facing the first inclined side surface. The second main clearance surface is tilted outwards when viewed from a first longitudinal edge facing the second main cutting edge or coinciding with the second main cutting edge toward a opposite second longitudinal edge facing the second inclined side surface. Both alternatives imply that the main clearance surfaces associated with the functioning main cutting edge facilitate chip removal from the cutting insert.

[0033] According to another embodiment of the invention, the cutting insert is provided with a through hole extending centrally through the cutting insert between the first main facet and the second main facet, wherein the central axis of the through hole coincides with the central axis of the cutting insert. In this case, the first chip deflector is preferably arranged at the center of the first main facet, meaning that the first chip deflector is arranged on the first main facet in a region where the thickness of the hole wall between the through hole and the first main facet typically has its minimum value. The first chip deflector contributes to a local increase in the thickness of the hole wall between the through hole and the first main facet, and thereby serves as a reinforcement on the cutting insert. This reinforcement allows for a reduction in certain dimensions of the cutting insert without compromising its strength.

[0034] According to another embodiment of the invention, the first chip deflection surface is traversed by the aforementioned central plane along an intersecting line extending between the first and second ends of the first chip deflection member. This ensures that the first chip deflection member effectively contributes to the reinforcement of the cutting insert along its entire length.

[0035] Another embodiment of the present invention is characterized in that:

[0036] - The outer peripheral surface includes a second main side surface, which forms the second outer peripheral side surface of the cutting blade;

[0037] - The third main cutting edge is formed at the intersection between the second main side surface and the first main surface;

[0038] - The fourth main cutting edge is formed at the intersection between the second main side surface and the second main surface;

[0039] - A third inclined side surface and a fourth inclined side surface are formed on the second main side surface, wherein the third inclined side surface is located between the first main surface and the fourth inclined side surface and is configured to form a clearance surface for the third main cutting edge in the third working position of the working position, and the fourth inclined side surface is located between the second main surface and the third inclined side surface and is configured to form a clearance surface for the fourth main cutting edge in the fourth working position of the working position. When viewed from a first edge of the third inclined side surface facing the first main surface toward a opposite second edge of the third inclined side surface facing the fourth inclined side surface, the third inclined side surface is inclined inward, and when viewed from a first edge of the fourth inclined side surface facing the second main surface toward a opposite second edge of the fourth inclined side surface facing the third inclined side surface, the fourth inclined side surface is inclined inward, wherein the third inclined side surface and the fourth inclined side surface are positioned opposite each other and inclined toward each other, thereby forming a recess on the second main side surface between the third main cutting edge and the fourth main cutting edge.

[0040] - The cutting insert includes a second chip deflection member formed on the second primary side surface, in the form of a protrusion extending through the recess formed by the third and fourth inclined side surfaces, wherein the second chip deflection member has a first end facing the third primary cutting edge, an opposing second end facing the fourth primary cutting edge, and at least a first chip deflection surface extending between the first and second ends of the second chip deflection member and configured to deflect chips impacting the second primary side surface away from the recess formed by the third and fourth inclined side surfaces; and

[0041] - Each of the third and fourth inclined side surfaces includes a first sub-surface located on a first side of the second chip deflector and a second sub-surface located on the opposite second side of the second chip deflector.

[0042] In this configuration, the cutting insert has at least four distinct working positions. Increasing the number of possible working positions of the cutting insert also leads to an increase in its service life. To obtain a double-sided cutting insert with four or more working positions, the cutting insert is preferably rotationally symmetric about its central axis at 360° / n, where n is an integer of 2 or greater, preferably a value of 2, 3, 4, 5, 6, 7, or 8.

[0043] According to another embodiment of the invention, each of the inclined side surfaces is configured to serve as an abutment surface of the cutting insert in at least one working position of the cutting insert, and abuts against a corresponding support surface in the insert holder when the cutting insert is mounted in the insert holder of the milling tool body in that at least one working position. Thus, the same inclined side surface can serve as a clearance surface for the active main cutting edge in one working position of the cutting insert, and as an abutment surface of the cutting insert in another working position of the cutting insert. Two inclined side surfaces on the same main side surface can be configured to jointly serve as an abutment surface of the cutting insert in some of the possible working positions of the cutting insert. However, alternatively, two inclined side surfaces on the same main side surface can be configured to serve as abutment surfaces of the cutting insert, one at a time, in different working positions of the cutting insert. To ensure good stability of contact between the abutment surface formed by one of the inclined side surfaces and the corresponding support surface in the insert holder of the tool body, it is preferable that the sub-surfaces of the inclined side surfaces on both sides of the intermediate chip deflector are jointly included in the abutment surface. However, as an alternative, the abutting surface may include only one of the two sub-surfaces of the inclined side surface in question.

[0044] According to another embodiment of the present invention, the cutting blade comprises:

[0045] - A first curved corner cutting edge and a first surface wiping cutting edge, the first curved corner cutting edge and the first surface wiping cutting edge being formed at the intersection between the outer peripheral surface and the first main surface, wherein the first main cutting edge, the first curved corner cutting edge and the first surface wiping cutting edge are arranged one after another, wherein the first curved corner cutting edge is located between the first main cutting edge and the first surface wiping cutting edge;

[0046] - A second curved corner cutting edge and a second surface wiping cutting edge, the second curved corner cutting edge and the second surface wiping cutting edge being formed at the intersection between the outer peripheral surface and the second main surface, wherein the second main cutting edge, the second curved corner cutting edge and the second surface wiping cutting edge are arranged one after another, wherein the second curved corner cutting edge is located between the second main cutting edge and the second surface wiping cutting edge;

[0047] - A third curved corner cutting edge and a third surface wiping cutting edge, the third curved corner cutting edge and the third surface wiping cutting edge being formed at the intersection between the outer peripheral surface and the first main surface, wherein the third main cutting edge, the third curved corner cutting edge and the third surface wiping cutting edge are arranged one after another, wherein the third curved corner cutting edge is located between the third main cutting edge and the third surface wiping cutting edge; and

[0048] - A fourth curved corner cutting edge and a fourth surface wiping cutting edge, the fourth curved corner cutting edge and the fourth surface wiping cutting edge being formed at the intersection between the outer peripheral surface and the second main surface, wherein the fourth main cutting edge, the fourth curved corner cutting edge and the fourth surface wiping cutting edge are arranged one after another, wherein the fourth curved corner cutting edge is located between the fourth main cutting edge and the fourth surface wiping cutting edge.

[0049] In this case, the cutting insert may be in the form of a square shoulder milling insert or a face milling insert.

[0050] Other advantageous features of the double-sided cutting insert according to the invention will become apparent from the following description.

[0051] The present invention also relates to a milling tool comprising cutting inserts of the type described above.

[0052] Other advantageous features of the milling tool according to the invention will become apparent from the following description. Attached Figure Description

[0053] Referring to the accompanying drawings, the following is a detailed description of embodiments of the present invention, cited by way of example. In the drawings:

[0054] Figures 1a-1d These are perspective views of a double-sided cutting blade according to a first embodiment of the present invention from different directions.

[0055] Figure 1e yes Figures 1a-1d Top view of the cutting insert.

[0056] Figure 1f yes Figures 1a-1d A bottom view of the cutting insert.

[0057] Figure 1g It is based on Figure 1e A cross-sectional view of line Ig-Ig in the middle.

[0058] Figure 1h yes Figures 1a-1d Side view of the cutting blade.

[0059] Figures 2a-2d These are perspective views of a double-sided cutting blade according to a second embodiment of the present invention from different directions.

[0060] Figure 2e yes Figures 2a-2d Top view of the cutting insert.

[0061] Figure 2f yes Figures 2a-2d A bottom view of the cutting insert.

[0062] Figure 2g It is based on Figure 2e A sectional view of line IIg-IIg in the middle.

[0063] Figure 2h yes Figures 2a-2d Side view of the cutting blade.

[0064] Figure 3a and Figure 3b These are perspective views of a double-sided cutting blade according to a third embodiment of the present invention from different directions.

[0065] Figure 3c yes Figure 3a and Figure 3b Top view of the cutting insert.

[0066] Figure 3d yes Figure 3a and Figure 3b A bottom view of the cutting insert.

[0067] Figure 3e It is based on Figure 3c A sectional view of line IIIe-IIIe in the middle.

[0068] Figure 3f yes Figure 3a and Figure 3b Side view of the cutting blade.

[0069] Figure 4 It is set according to the following: Figures 1a-1h The side view of the milling cutter with the cutting insert shown in the embodiment is shown.

[0070] Figure 5 yes Figure 4 Perspective view of a milling cutter.

[0071] Figure 6 From Figure 4 A perspective view of the milling tool from another direction, and

[0072] Figure 7 It corresponds to Figure 6 The perspective view, as seen, shows the cutting insert being removed from its insert holder within the tool body of the milling cutter. Detailed Implementation

[0073] Three different embodiments of the double-sided cutting inserts 1, 1', and 1" according to the present invention are presented in... Figures 1a-1h , Figures 2a-2h and Figures 3a-3f As shown in the diagram. Cutting inserts 1, 1', and 1" are configured for milling and are configured for milling tools, such as... Figures 4-7 Milling cutter 80 of the type shown.

[0074] Cutting inserts 1, 1', 1" have a basic polygonal shape and are rotatable to different working positions. Cutting inserts 1, 1', 1" include a first main face and second main faces 2, 3, which are arranged on opposite sides of the cutting insert and serve as the top and bottom surfaces of the cutting insert. As seen in the plan view of cutting inserts 1, 1', 1", the first main face and second main faces 2, 3 have a polygonal shape, or at least a substantially polygonal shape. The cutting insert has a central axis C extending between the first main face and the second main faces 2, 3. Figure 1h , Figure 2h and Figure 3f As shown, the intermediate plane MP that constitutes the imaginary plane extends perpendicularly to the central axis C halfway between the first principal plane and the second principal plane 2, 3.

[0075] In the illustrated embodiment, the cutting blades 1, 1', 1" are provided with through holes 5, which extend centrally through the cutting blades between the first main face and the second main face 2, 3. The through holes 5 are configured to receive fastening elements 6, such as screws (see [reference needed]). Figures 4-7 Through this fastening element, the cutting inserts can be releasably secured to the insert holder 84 of the milling cutter 80. The central axis C of the cutting inserts 1, 1', 1" coincides with the central axis of the through hole 5. Alternatively, the cutting inserts 1, 1', 1" may not have the through hole 5, wherein the cutting inserts are configured to be releasably secured to the insert holder of the milling cutter by a suitable clamping device.

[0076] The outer peripheral clearance surface 10 extends around the cutting inserts 1, 1', 1" between the first principal face and the second principal faces 2, 3. The outer peripheral clearance surface 10 includes a first principal side face 11, which forms the first outer peripheral side of the cutting insert. The first principal side face 11 surrounds an imaginary reference axis A1 (see...). Figure 1h , Figure 2h and Figure 3f It has 180° rotational symmetry, and the reference axis A1 extends through the center point P1 of the first main side surface 11 and extends perpendicularly to the central axis C of the cutting tool. The first main cutting edge 21 is formed at the intersection between the first main side surface 11 and the first main surface 2, and the second main cutting edge 22 is formed at the intersection between the first main side surface 11 and the second main surface 3.

[0077] A first inclined side surface 31 and a second inclined side surface 32 are formed on the first main side surface 11 between the first main cutting edge 21 and the second main cutting edges 22. The first inclined side surface 31 is located between the first main surface 2 and the second inclined side surface 32 and is configured to form a clearance surface for the first main cutting edge 21 in a first working position of the working position. The second inclined side surface 32 is located between the second main surface 3 and the first inclined side surface 31 and is configured to form a clearance surface for the second main cutting edge 22 in a second working position of the working position. When viewed from the first edge 31a of the first inclined side surface 31 facing the first main surface 2 toward the opposite second edge 31b of the first inclined side surface 31 facing the second inclined side surface 32, the first inclined side surface 31 is inclined inward. Correspondingly, when viewed from the first edge 32a of the second inclined side surface 32 facing the second main surface 32 toward the opposite second edge 32b of the second inclined side surface 32 facing the first inclined side surface 31, the second inclined side surface 32 is inclined inward. The first inclined side surface 31 and the second inclined side surface 32 are positioned opposite each other and inclined toward each other, thereby forming a recess D1 on the first main side surface 11, between the first main cutting edge 21 and the second main cutting edge 22. Figures 1a-1h In the illustrated embodiment, as seen from a cross-section through the recess, the recess D1 has a V-shaped profile.

[0078] In the illustrated embodiment, the first inclined side surface 31 is separated from the second inclined side surface 32 by an elongated transition region 35, which is adjacent to the second edges 31b, 32b of the first and second inclined side surfaces and extends in the circumferential direction of the outer peripheral surface 10. Figures 1a-1h and 3a- Figure 3f In the illustrated embodiment, the transition region 35 extends obliquely relative to the intermediate plane MP. Figures 2a-2h In the embodiment shown, the transition region 35 extends parallel to the intermediate plane MP.

[0079] The cutting inserts 1, 1', 1" include a first chip deflecting member 50 formed on a first main side surface 11. The first chip deflecting member 50 is in the form of a protrusion extending through the aforementioned recess D1, wherein the first chip deflecting member 50 has a first end 50a facing the first main cutting edge 21 and an opposing second end 50b facing the second main cutting edge 22. The first inclined side surface and the second inclined side surface 31, 32 are both at least partially penetrated by the first chip deflecting member 50, wherein the first inclined side surface 31 has a first sub-surface and a second sub-surface 31', 31" located on opposite sides of the first chip deflecting member 50, and wherein the second inclined side surface 32 correspondingly has a first sub-surface and a second sub-surface 32', 32" located on opposite sides of the first chip deflecting member 50. Figures 1a-1h and Figures 2a-2h In the embodiment shown, the first sub-surface and the second sub-surface 31', 31" of the first inclined side surface 31 are located together in one plane, and the first sub-surface and the second sub-surface 32', 32" of the second inclined side surface 32 are located together in another plane.

[0080] The first chip deflection member 50 includes a first chip deflection surface 51 extending between a first end 50a and a second end 50b of the first chip deflection member and configured to deflect chips impacting the first main side surface 11 away from the recess D1. In the illustrated embodiment, the first chip deflection member 50 further includes a second chip deflection surface 52 and a third chip deflection surface 53 disposed on opposite sides of the first chip deflection surface 51, wherein the second chip deflection surface 52 is inclined outward from the first chip deflection surface 51 and abuts the first sub-surfaces 31', 32' of the first inclined side surface and the second inclined side surface 31, 32, and wherein the third chip deflection surface 53 is inclined outward from the first chip deflection surface 51 and abuts the second sub-surfaces 31”, 32 of the first inclined side surface and the second inclined side surface 31, 32. In the illustrated embodiment, the second chip deflecting surface 52 is adjacent to and extends completely along the first longitudinal edge 51a of the first chip deflecting surface 51, and the third chip deflecting surface 53 is adjacent to and extends completely along the opposite second longitudinal edge 51b of the first chip deflecting surface 51, wherein each of these first and second longitudinal edges 51a, 51b extends between the first end and the second ends 50a, 50b of the first chip deflecting member 50. Figures 1a-1h In the illustrated embodiment, the first chip deflection surface 51 has a parallelogram shape, and the second and third chip deflection surfaces 52 and 53 are triangular.

[0081] Cutting inserts 1, 1', 1" have a central plane CP that includes the central axis C of the cutting insert and the center point P1 of the first main side surface 11 (see...). Figure 1h , Figure 2h and Figure 3f The first chip deflection member 50 is preferably arranged at the center of the first main side surface 11, such that the first chip deflection surface 51 is traversed by the central plane CP along the intersection line L extending between the first end and the second end 50a, 50b of the first chip deflection member 50.

[0082] exist Figures 1a-1h In the illustrated embodiment, in the first working position, the clearance surface formed by the first inclined side surface 31 is configured to serve as an auxiliary clearance surface for the first main cutting edge 21, and in the second working position, the clearance surface formed by the second inclined side surface 32 is configured to serve as an auxiliary clearance surface for the second main cutting edge 22, wherein the first main clearance surface 41 and the second main clearance surface 42 are formed on the first main side surface 11. The first main clearance surface 41 is adjacent to the first main cutting edge 21 and located between the first main cutting edge 21 and the first inclined side surface 31, thereby serving as the main clearance surface for the first main cutting edge 21 in the first working position. The second main clearance surface 42 is adjacent to the second main cutting edge 22 and located between the second main cutting edge 22 and the second inclined side surface 32, thereby serving as the main clearance surface for the second main cutting edge 22 in the second working position. In this case, the first chip deflection surface 51 preferably extends between the first main gap surface and the second main gap surfaces 41, 42, wherein the first chip deflection surface 51 is adjacent to the first main gap surface 41 at the first end 50a of the first chip deflection member 50, and is adjacent to the second main gap surface 42 at the second end 50b of the first chip deflection member 50.

[0083] The first primary clearance surface 41 has a first longitudinal edge 41a facing or coinciding with the first primary cutting edge 21 and an opposing second longitudinal edge 41b facing the first inclined side surface 31. Correspondingly, the second primary clearance surface 42 has a first longitudinal edge 42a facing or coinciding with the second primary cutting edge 22 and an opposing second longitudinal edge 42b facing the second inclined side surface 32. Figures 1a-1hIn the illustrated embodiment, when viewed from the first longitudinal edge 41a of the first primary clearance surface 41 toward the second longitudinal edge 41b of the first primary clearance surface 41, the first primary clearance surface 41 is inclined outwards, and when viewed from the first longitudinal edge 42a of the second primary clearance surface 42 toward the second longitudinal edge 42b of the second primary clearance surface 42, the second primary clearance surface 42 is inclined outwards. Alternatively, the first and second primary clearance surfaces 41, 42 may be perpendicular to the intermediate plane MP, as seen in a cross-section through which the central plane CP of the cutting insert 1 passes parallel to the first and second primary clearance surfaces 41, 42.

[0084] Figures 1a-1h The cutting insert 1 shown has the form of a square-shoulder milling insert. In this case, the outer peripheral surface 10 includes a second main side surface 12 forming a second outer peripheral side of the cutting insert 1, a third main side surface 13 forming a third outer peripheral side of the cutting insert 1, and a fourth main side surface 14 forming a fourth outer peripheral side of the cutting insert 1. The first main side surface and the second main side surface 11, 12 form a first pair of opposing main side surfaces, and the third main side surface and the fourth main side surface 13, 14 form a second pair of opposing main side surfaces. Therefore, the first main side surface and the second main side surface 11, 12 are positioned relative to each other on the mutually opposing sides of the central axis C of the cutting insert 1. Correspondingly, the third main side surface and the fourth main side surface 13, 14 are positioned relative to each other on the mutually opposing sides of the central axis C of the cutting insert 1.

[0085] The second primary facet 12 is identical to the first primary facet 11 within manufacturing tolerances and is rotationally symmetrical about an imaginary reference axis that extends through the center point P2 of the second primary facet 12 and perpendicular to the central axis C of the cutting insert. A third primary cutting edge 23 is formed at the intersection of the second primary facet 12 and the first primary facet 2, and a fourth primary cutting edge 24 is formed at the intersection of the second primary facet 12 and the second primary facet 3.

[0086] The third inclined side surface 33 and the fourth inclined side surface 34 are formed on the second main side surface 12 between the third main cutting edge and the fourth main cutting edge 23, 24. The third inclined side surface 33 is located between the first main surface 2 and the fourth inclined side surface 34, and is configured to form a clearance surface for the third main cutting edge 23 in the third working position of the working position. The fourth inclined side surface 34 is located between the second main surface 3 and the third inclined side surface 33, and is configured to form a clearance surface for the fourth main cutting edge 24 in the fourth working position of the working position. When viewed from the first edge 33a of the third inclined side surface 33 facing the first main surface 2 toward the opposite second edge 33b of the third inclined side surface 33 facing the fourth inclined side surface 34, the third inclined side surface 33 is inclined inward. Correspondingly, when viewed from the first edge 34a of the fourth inclined side surface 34 facing the second main surface 3 towards the opposite second edge 34b of the fourth inclined side surface 34 facing the third inclined side surface 33, the fourth inclined side surface 34 is inclined inward. The third and fourth inclined side surfaces 33 and 34 are positioned relative to each other and inclined towards each other, thereby forming a recess D2 on the second main side surface 12 between the third and fourth main cutting edges 23 and 24.

[0087] The cutting insert 1 includes a second chip deflecting member 60 formed on the second main side surface 12. The second chip deflecting member 60 is in the form of a protrusion extending through the aforementioned recess D2, wherein the second chip deflecting member 60 has a first end 60a facing the third main cutting edge 23 and an opposing second end 60b facing the fourth main cutting edge 24. The third and fourth inclined side surfaces 33 and 34 are traversed by the second chip deflecting member 60, wherein the third inclined side surface 33 has a first sub-surface and a second sub-surface 33' and 33'' located on the opposing side of the second chip deflecting member 60, and wherein the fourth inclined side surface 34 correspondingly has a first sub-surface and a second sub-surface 34' and 34'' located on the opposing side of the second chip deflecting member 60. Figures 1a-1h In the embodiment shown, the first sub-surface and the second sub-surfaces 33' and 33" of the third inclined side surface 33 are located together in one plane, and the first sub-surface and the second sub-surfaces 34' and 34" of the fourth inclined side surface 34 are located together in another plane.

[0088] The second chip deflection member 60 includes a first chip deflection surface 61 extending between a first end 60a and a second end 60b of the second chip deflection member, and is configured to deflect chips impacting the second main side surface 12 away from the recess D2. In the illustrated embodiment, the second chip deflection member 60 further includes a second chip deflection surface 62 and a third chip deflection surface 63 disposed on opposite sides of the first chip deflection surface 61, wherein the second chip deflection surface 62 is inclined outward from the first chip deflection surface 61 and abuts the first sub-surfaces 33', 34' of the third inclined side surface and the fourth inclined side surface 33, 34, and wherein the third chip deflection surface 63 is inclined outward from the first chip deflection surface 61 and abuts the second sub-surfaces 33', 34 of the third inclined side surface and the fourth inclined side surface 33, 34.

[0089] exist Figures 1a-1h In the illustrated embodiment, in the third working position, the clearance surface formed by the third inclined side surface 33 is configured to serve as an auxiliary clearance surface for the third main cutting edge 23, and in the fourth working position, the clearance surface formed by the fourth inclined side surface 34 is configured to serve as an auxiliary clearance surface for the fourth main cutting edge 24, wherein the third main clearance surface 43 and the fourth main clearance surface 44 are formed on the second main side surface 12. The third main clearance surface 43 is adjacent to the third main cutting edge 23 and is located between the third main cutting edge 23 and the third inclined side surface 33, thereby serving as the main clearance surface for the third main cutting edge 23 in the third working position. The fourth main clearance surface 44 is adjacent to the fourth main cutting edge 24 and is located between the fourth main cutting edge 24 and the fourth inclined side surface 34, thereby serving as the main clearance surface for the fourth main cutting edge 24 in the fourth working position.

[0090] exist Figures 1a-1hIn the illustrated embodiment, the outer peripheral surface 10 further includes a first corner side surface 15 located between the first main side surface and the third main side surface 11, 13; a second corner side surface 16 located between the second main side surface and the third main side surface 12, 13; a third corner side surface 17 located between the third main side surface and the fourth main side surface 13, 14; and a fourth corner side surface 18 located between the fourth main side surface and the first main side surface 14, 11. A first curved corner cutting edge 25a extends along the first corner side surface 15 and forms at the intersection between the first corner side surface 15 and the first main surface 2. A second curved corner cutting edge 25b extends along the fourth corner side surface 18 and forms at the intersection between the fourth corner side surface 18 and the second main surface 3. A third curved corner cutting edge 25c extends along the third corner side surface 17 and forms at the intersection between the third corner side surface 17 and the first main surface 2. The fourth curved corner cutting edge 25d extends along the second corner side surface 16 and forms at the intersection between the second corner side surface 16 and the second main surface 3. The first curved corner cutting edge and the third curved corner cutting edges 25a and 25c are positioned diagonally opposite each other on the first main surface 2, and the second curved corner cutting edge and the fourth curved corner cutting edge 25b and 25d are positioned diagonally opposite each other on the second main surface 3.

[0091] exist Figures 1a-1h In the illustrated embodiment, the first surface-wiping cutting edge 26a and the first beveling cutting edge 27a extend successively along a portion of the third main side surface 13 and form at the intersection between the third main side surface 13 and the first main surface 2. The second surface-wiping cutting edge 26b and the second beveling cutting edge 27b extend successively along a portion of the fourth main side surface 14 and form at the intersection between the fourth main side surface 14 and the second main surface 3. The third surface-wiping cutting edge 26c and the third beveling cutting edge 27c extend successively along another portion of the fourth main side surface 14 and form at the intersection between the fourth main side surface 14 and the first main surface 2. The fourth surface-wiping cutting edge 26d and the fourth beveling cutting edge 27d extend successively along another portion of the third main side surface 13 and form at the intersection between the third main side surface 13 and the second main side surface 3.

[0092] A first curved-angle cutting edge 25a extends between a first main cutting edge 21 and a first surface-wiping cutting edge 26a; a second curved-angle cutting edge 25b extends between a second main cutting edge 22 and a second surface-wiping cutting edge 26b; a third curved-angle cutting edge 25c extends between a third main cutting edge 23 and a third surface-wiping cutting edge 26c; and a fourth curved-angle cutting edge 25d extends between a fourth main cutting edge 24 and a fourth surface-wiping cutting edge 26d. The first main cutting edge 21, the first curved-angle cutting edge 25a, the first surface-wiping cutting edge 26a, and the first beveling cutting edge 27a form a first set of cutting edges, which constitute the functional cutting edges of the cutting insert 1 when the insert is in a first working position. The second main cutting edge 22, the second curved-angle cutting edge 25b, the second surface-wiping cutting edge 26b, and the second beveling cutting edge 27b form a second set of cutting edges, which constitute the functional cutting edges of the cutting insert 1 when the insert is in a second working position. The third main cutting edge 23, the third curved corner cutting edge 25c, the third surface wiping cutting edge 26c, and the third beveling cutting edge 27c form a third set of cutting edges, wherein when the cutting insert is in the third working position, this third set of cutting edges constitutes the functional cutting edges of the cutting insert 1. The fourth main cutting edge 24, the fourth curved corner cutting edge 25d, the fourth surface wiping cutting edge 26d, and the fourth beveling cutting edge 27d form a fourth set of cutting edges, wherein when the cutting insert is in the fourth working position, this fourth set of cutting edges constitutes the functional cutting edges of the cutting insert 1. Figures 1a-1h In the illustrated embodiment, the portion 28 of the outer peripheral edge of the first main surface 2 extending between the first beveling cutting edge 27a and the third main cutting edge 23, and between the third beveling cutting edge 27c and the first main cutting edge 21, constitutes a non-functional transition portion. The portion 29 of the outer peripheral edge of the second main surface 3 extending between the fourth beveling cutting edge 27d and the second main cutting edge 22, and between the second beveling cutting edge 27b and the fourth main cutting edge 24, also constitutes a non-functional transition portion.

[0093] Figures 4-7A milling cutter 80 in the form of a face milling cutter is shown. The milling cutter 80 includes an elongated cutter body 81 and is configured to rotate about a rotation axis 82. The cutter body 81 has a rear end 81a and an opposing front end 81b. A longitudinal axis 83 of the cutter body 81 extends between the rear end 81a and the front end 81b, wherein the longitudinal axis 83 coincides with the rotation axis 82 of the milling cutter 80. At the rear end 81a, the cutter body 81 is mounted to the rotary spindle of a milling machine or the like, for example, via a tool holder. At the front end 81b, the cutter body 81 is provided with insert holders 84 configured to receive cutting inserts 1. In the illustrated example, the cutter body 81 is provided with four insert holders 84, which are evenly distributed around the longitudinal axis 83 of the cutter body and configured to receive cutting inserts 1. However, alternatively, particularly depending on the diameter of the cutter body, the cutter body 81 may be provided with any other suitable number of insert holders 84. A tool body with a smaller diameter may have, for example, two insert holders, while a tool body with a larger diameter may have more than four insert holders.

[0094] The cutting insert 1 is installed in each insert holder 84 within the tool body 81. Figures 4-7 In the embodiment shown, the milling cutter 80 is provided with Figures 1a-1h Cutting inserts 1 of the type shown. Each cutting insert 1 is configured to be releasably mounted to an associated insert holder 84. In the illustrated embodiment, each cutting insert 1 is secured to the associated insert holder 84 by a fastening element 6 in the form of a screw, which extends through a through-hole 5 in the cutting insert 1 and engages a threaded hole 85 in a tangential support surface 86 in the insert holder (see [link to documentation]). Figure 7 The insert holder 84 is also provided with a radial support surface 87 and an axial support surface 88. The cutting insert 1 is provided with at least one radial abutment surface on each of the first main side and the second main side 11, 12, and at least one axial abutment surface 7a-7d on each of the third main side and the fourth main side 13, 14.

[0095] A recess 89 is provided in the radial support surface 87, wherein the recess 89 is configured to receive chip deflecting members 50, 60 disposed on the main side surfaces 11, 12 currently facing the radial support surface 87. The recess 89 is sized such that the chip deflecting members 50, 60 are accommodated with clearance within the recess 89, i.e., without contacting any surface of the recess 89 or any other surface of the blade holder 84. Figures 4-7 In the illustrated embodiment, the recess 89 has the form of a groove that extends through the radial support surface 87 and divides the radial support surface 87 into two separate sub-surfaces.

[0096] Figures 1a-1h Each of the aforementioned inclined side surfaces 31-34 of the cutting insert 1 shown is configured to serve as a radial abutment surface of the cutting insert 1 in at least one working position of the cutting insert 1, and abuts against a corresponding radial support surface 87 in the insert holder 84 of the tool body 81 when the cutting insert 1 is mounted in that at least one working position. In the illustrated example:

[0097] - When the cutting insert 1 is in the first working position, the fourth inclined side surface 34 abuts against the radial support surface 87, and the first axial abutting surface 7a on the fourth main side surface 14 abuts against the axial support surface 88.

[0098] - When the cutting insert 1 is in the second working position, the third inclined side surface 33 abuts against the radial support surface 87, and the second axial abutting surface 7b on the third main side surface 13 abuts against the axial support surface 88.

[0099] - When the cutting insert 1 is in the third working position, the second inclined side surface 32 abuts against the radial support surface 87, and the third axial abutment surface 7c on the third main side surface 13 abuts against the axial support surface 88; and

[0100] - When the cutting insert 1 is in the fourth working position, the first inclined side surface 31 abuts against the radial support surface 87, and the fourth axial abutting surface 7d on the fourth main side surface 14 abuts against the axial support surface 88.

[0101] Alternatively, the third and fourth inclined side surfaces 33 and 34 can be configured to jointly serve as the abutment surfaces of the cutting insert 1 in both the first and second working positions, and abut against the corresponding radial support surfaces 87 and 87' in the insert holder 84, wherein the first and second inclined side surfaces 31 and 32 are configured to jointly serve as the abutment surfaces of the cutting insert 1 in both the third and fourth working positions. As a further alternative, the second sub-surfaces 33” and 34” of the third and fourth inclined side surfaces 33 and 34 can be used one at a time as the radial abutment surfaces of the cutting insert 1 in both the first and second working positions, wherein the second sub-surfaces 31” and 32” of the first and second inclined side surfaces 31 and 32 serve one at a time as the radial abutment surfaces of the cutting insert 1 in both the third and fourth working positions.

[0102] When the cutting insert 1 is in either the first working position or the third working position, the second main surface 3 or at least a portion thereof abuts against the tangential support surface 86 in the insert holder 84, and when the cutting insert 1 is in either the second working position or the fourth working position, the first main surface 2 or at least a portion thereof abuts against the tangential support surface 86.

[0103] The cutting inserts 1, 1', 1" of the present invention are preferably rotationally symmetrical about the central axis C of the cutting insert at 360° / n, where n is an integer of 2 or greater, preferably 2, 3, 4, 5, 6, 7, or 8. Figures 1a-1h In the embodiment shown, the cutting blade 1 has a basic rectangular shape and is capable of rotating to four different working positions, wherein the cutting blade 1 has 180° rotational symmetry about the central axis C of the cutting blade.

[0104] Figures 2a-2h The cutting insert 1' shown is in the form of a face milling insert, having a basic square shape and being able to rotate to eight different working positions. In this case, the cutting insert 1' has 90° rotational symmetry about the central axis C of the cutting insert, which means that the cutting insert 1' has four main facets 11-14 that are identical to each other within manufacturing tolerances. Therefore, each main facet 11-14 is provided with a first main cutting edge 21 formed at the intersection between the main facet 11-14 and the first main face 2, and a second main cutting edge 22 formed at the intersection between the main facet 11-14 and the second main face 3. Furthermore, a first inclined side surface 31 and a second inclined side surface 32 are formed on each main facet 11-14 between the first main cutting edge and the second main cutting edge 21, 22, wherein the first inclined side surface and the second inclined side surface 31, 32 on each main facet 11-14 are inclined toward each other in the manner described above, so as to form a recess D1 between the first main cutting edge and the second main cutting edge 21, 22 on the main facet 11-14 in question. The chip deflection member 50 of the above type is formed on each main side 11-14 in the form of a protrusion extending through the recess D1 on the main side 11-14 in question.

[0105] exist Figures 2a-2h In the illustrated embodiment, the surface wiping cutting edges 26' are located at the corners between each pair of adjacent first main cutting edges 21 and between each pair of adjacent second main cutting edges 22. Each surface wiping cutting edge 26' is connected at each end to the adjacent main cutting edges 21, 22 via curved corner cutting edges 25'. Thus, each surface wiping cutting edge 26' is connected to two curved corner cutting edges 25' arranged on opposite sides of the surface wiping cutting edge 26'.

[0106] exist Figures 2a-2hIn the illustrated embodiment, each of the inclined side surfaces 31, 32 on the main side surfaces 11-14 is configured to serve as a radial abutment surface of the cutting blade 1' in at least one working position of the cutting blade, and is configured to serve as an axial abutment surface of the cutting blade 1' in at least one other working position of the cutting blade.

[0107] Figures 3a-3f The cutting insert 1” shown is in the form of a high-feed milling insert, having a generally triangular basic shape and capable of rotating to six different working positions. In this case, the cutting insert 1” has 120° rotational symmetry about the central axis C of the cutting insert, which means that the cutting insert 1” has three main facets 11-13 that are identical to each other within manufacturing tolerances. Therefore, each main facet 11-13 is provided with a first main cutting edge 21 formed at the intersection between the main facet 11-13 and the first main facet 2, and a second main cutting edge formed at the intersection between the main facet 11-13 and the second main facet 3. 22. Furthermore, a first inclined side surface 31 and a second inclined side surface 32 are formed on each main side surface 11-13 between the first main cutting edge and the second main cutting edge 21, 22, wherein the first inclined side surface and the second inclined side surface 31, 32 on each main side surface 11-13 are inclined toward each other in the manner described above, so as to form a recess D1 on the main side surface 11-13 between the first main cutting edge and the second main cutting edge 21, 22. A chip deflecting member 50 of the above type is formed on each main side surface 11-13 in the form of a protrusion extending through the recess D1 on the main side surface 11-13.

[0108] exist Figures 3a-3f In the illustrated embodiment, as seen from the circumferential direction of the cutting blade 1”, the first main cutting edge and the second main cutting edges 21, 22, as well as the main side surfaces 11-13, have convex shapes.

[0109] exist Figures 3a-3f In the illustrated embodiment, the curved corner cutting edge 25” is located at the corner between each pair of adjacent first main cutting edges 21 and at the corner between each pair of adjacent second main cutting edges 22. Therefore, each main cutting edge 21, 22 is connected to the adjacent main cutting edge 21, 22 at each end via the curved corner cutting edge 25”.

[0110] This invention is not, of course, limited in any way to the embodiments described above. Rather, it will be apparent to those skilled in the art that many possibilities exist for modifications to the invention without departing from the basic spirit of the invention as defined in the appended claims.

Claims

1. A double-sided cutting insert for milling, wherein the cutting insert (1; 1’； 1) It has a basic polygonal shape and is capable of rotating to different working positions, and includes: - A first main face and a second main face (2, 3), the first main face and the second main face (2, 3) are arranged on opposite sides of the cutting insert (1; 1'; 1") and serve as the top and bottom surfaces of the cutting insert, each of the first main face and the second main face (2, 3) having a polygonal shape when viewed in a plan view of the cutting insert (1; 1'; 1"); - A central axis (C) extending between the first main surface and the second main surface (2, 3); - An outer peripheral surface (10) extends around the cutting blade (1; 1'; 1") between the first main surface and the second main surface (2, 3) and includes at least a first main side surface (11) forming a first outer peripheral side of the cutting blade; - A first main cutting edge (21) is formed at the intersection between the first main side surface (11) and the first main surface (2); - A second primary cutting edge (22), which is formed at the intersection between the first primary side surface (11) and the second primary surface (3); and - A first inclined side surface (31) and a second inclined side surface (32) are formed on the first main side surface (11), wherein the first inclined side surface (31) is located between the first main surface (2) and the second inclined side surface (32) and is configured to form a clearance surface for the first main cutting edge (21) in a first working position of the working position, and the second inclined side surface (32) is located between the second main surface (3) and the first inclined side surface (31) and is configured to form a clearance surface for the second main cutting edge (22) in a second working position of the working position, when the first edge (31a) of the first inclined side surface (31) facing the first main surface (2) moves towards the second inclined side surface (32) When viewed from the direction of the opposing second edge (31b) of the first inclined side surface (31) of 32), the first inclined side surface (31) is inclined inward, and when viewed from the direction of the opposing second edge (32b) of the second inclined side surface (32) facing the second main surface (3), the second inclined side surface (32) is inclined inward, wherein the first inclined side surface and the second inclined side surface (31, 32) are positioned relative to each other and inclined toward each other, thereby forming a recess (D1) between the first main cutting edge and the second main cutting edge (21, 22) on the first main side surface (11), characterized in that: - The cutting insert (1; 1'; 1") includes a first chip deflection member (50) formed on the first main side surface (11), in the form of a protrusion extending through the recess (D1) formed by the first inclined side surface and the second inclined side surface (31, 32), wherein the first chip deflection member (50) has a first end (50a) facing the first main cutting edge (21), an opposing second end (50b) facing the second main cutting edge (22), and at least a first chip deflection surface (51) extending between the first end and the second end (50a, 50b), and the first chip deflection surface (51) is configured to deflect chips impacting the first main side surface (11) away from the recess (D1); and - Each of the first inclined side surface and the second inclined side surface (31, 32) includes a first sub-surface (31', 32') located on a first side of the first chip deflector (50) and a second sub-surface (31', 32') located on the opposite second side of the first chip deflector (50), wherein the working position is such that the main cutting edge of the cutting insert is positioned to form a main cutting edge that functions in milling.

2. The double-sided cutting blade according to claim 1, characterized in that, The first chip deflection member (50) includes a second chip deflection surface (52) and a third chip deflection surface (53) disposed on opposite sides of the first chip deflection surface (51), wherein the second chip deflection surface (52) is inclined outward from the first chip deflection surface (51) and adjacent to the first sub-surface (31') of the first inclined side surface (31) and the first sub-surface (32') of the second inclined side surface (32), and wherein the third chip deflection surface (53) is inclined outward from the first chip deflection surface (51) and adjacent to the second sub-surface (31") of the first inclined side surface (31) and the second sub-surface (32") of the second inclined side surface (32").

3. The double-sided cutting insert according to claim 2, characterized in that: - The first chip deflection surface (51) has a first longitudinal edge (51a) extending between the first end and the second end (50a, 50b) of the first chip deflection member (50) and an opposing second longitudinal edge (51b) extending between the first end and the second end (50a, 50b) of the first chip deflection member (50). - The second chip deflection surface (52) is adjacent to the first longitudinal edge (51a) of the first chip deflection surface (51) and extends completely along the first longitudinal edge (51a) of the first chip deflection surface (51); and - The third chip deflection surface (53) is adjacent to the second longitudinal edge (51b) of the first chip deflection surface (51) and extends completely along the second longitudinal edge (51b) of the first chip deflection surface (51).

4. The double-sided cutting blade according to claim 2 or 3, characterized in that, The first chip deflection surface (51) has a parallelogram shape, and the second chip deflection surface and the third chip deflection surface (52, 53) are triangular.

5. The double-sided cutting insert according to any one of claims 1-3, characterized in that, The first main side surface (11) has 180° rotational symmetry about an imaginary reference axis (A1) that extends through the center point (P1) of the first main side surface (11) and is perpendicular to the central axis (C) of the cutting blade.

6. The double-sided cutting insert according to any one of claims 1-3, characterized in that: - In the first working position, the clearance surface formed by the first inclined side surface (31) is configured to serve as an auxiliary clearance surface for the first main cutting edge (21), wherein the first main clearance surface (41) is formed on the first main side surface (11), the first main clearance surface (41) is adjacent to the first main cutting edge (21) and located between the first main cutting edge (21) and the first inclined side surface (31), thereby serving as the main clearance surface for the first main cutting edge (21) in the first working position; and - In the second working position, the clearance surface formed by the second inclined side surface (32) is configured to serve as an auxiliary clearance surface of the second main cutting edge (22), wherein the second main clearance surface (42) is formed on the first main side surface (11), the second main clearance surface (42) is adjacent to the second main cutting edge (22) and is located between the second main cutting edge (22) and the second inclined side surface (32), thereby serving as the main clearance surface of the second main cutting edge (22) in the second working position.

7. The double-sided cutting blade according to claim 6, characterized in that, The first chip deflection surface (51) is adjacent to the first main clearance surface (41) at the first end (50a) of the first chip deflection member (50) and adjacent to the second main clearance surface (42) at the second end (50b) of the first chip deflection member (50).

8. The double-sided cutting insert according to claim 6, wherein, The cutting blade (1) has an intermediate plane (MP) extending halfway between the first main face and the second main face (2, 3) perpendicular to the central axis (C) of the cutting blade, characterized in that: - When viewed in a cross-section passing through the first primary clearance surface and the second primary clearance surface (41, 42) of the cutting blade, which is parallel to the center plane (CP) of the cutting blade containing the central axis (C) and the center point (P1) of the first primary side surface (11), each of the first primary clearance surface and the second primary clearance surface (41, 42) is perpendicular to the intermediate plane (MP); or - When viewed from the first longitudinal edge (41a) of the first main clearance surface (41) facing the first main cutting edge (21) or coinciding with the first main cutting edge (21) toward the opposite second longitudinal edge (41b) of the first main clearance surface (41) facing the first inclined side surface (31), the first main clearance surface (41) is inclined outward, wherein when viewed from the first longitudinal edge (42a) of the second main clearance surface (42) facing the second main cutting edge (22) or coinciding with the second main cutting edge (22) toward the opposite second longitudinal edge (42b) of the second main clearance surface (42) facing the second inclined side surface (32), the second main clearance surface (42) is inclined outward.

9. The double-sided cutting insert according to any one of claims 1-3, characterized in that: - The cutting insert (1; 1'; 1") is provided with a through hole (5), which extends centrally through the cutting insert between the first main face and the second main face (2, 3), wherein the central axis of the through hole (5) coincides with the central axis (C) of the cutting insert (1; 1'; 1"); and - The first chip deflection member (50) is arranged at the center of the first main side (11).

10. The double-sided cutting insert according to claim 9, wherein, The cutting insert (1; 1'; 1") has a central plane (CP) that includes the central axis (C) of the cutting insert and the center point (P1) of the first main side surface (11), characterized in that the first chip deflection surface (51) is traversed by the central plane (CP) along an intersecting line (L) that extends between the first end and the second end (50a, 50b) of the first chip deflection member (50).

11. The double-sided cutting insert according to any one of claims 1-3, characterized in that: - The outer peripheral surface (10) includes a second main side surface (12), which forms the second outer peripheral side of the cutting blade; - The third main cutting edge (23) is formed at the intersection between the second main side surface (12) and the first main surface (2); - The fourth main cutting edge (24) is formed at the intersection between the second main side surface (12) and the second main surface (3); - A third inclined side surface (33) and a fourth inclined side surface (34) are formed on the second main side surface (12), wherein the third inclined side surface (33) is located between the first main surface (2) and the fourth inclined side surface (34) and is configured to form a clearance surface for the third main cutting edge (23) in the third working position of the working position, and the fourth inclined side surface (34) is located between the second main surface (3) and the third inclined side surface (33) and is configured to form a clearance surface for the fourth main cutting edge (24) in the fourth working position of the working position, when the first edge (33a) of the third inclined side surface (33) facing the first main surface (2) moves towards the fourth inclined side surface (34) When viewed from the direction of the opposing second edge (33b) of the third inclined side surface (33) of the surface (34), the third inclined side surface (33) is inclined inward, and when viewed from the first edge (34a) of the fourth inclined side surface (34) facing the second main surface (3) toward the opposing second edge (34b) of the fourth inclined side surface (34) facing the third inclined side surface (33), the fourth inclined side surface (34) is inclined inward, wherein the third inclined side surface and the fourth inclined side surface (33, 34) are positioned relative to each other and inclined toward each other, thereby forming a recess (D2) between the third main cutting edge and the fourth main cutting edge (23, 24) on the second main side surface (12). - The cutting blade (1) includes a second chip deflection member (60) formed on the second main side surface (12), in the form of a protrusion extending through the recess (D2) formed by the third inclined side surface and the fourth inclined side surface (33, 34), wherein the second chip deflection member (60) has a first end (60a) facing the third main cutting edge (23), an opposing second end (60b) facing the fourth main cutting edge (24), and at least a first chip deflection surface (61) extending between the first end and the second end (60a, 60b) of the second chip deflection member, and is configured to deflect chips impacting the second main side surface (12) away from the recess (D2) formed by the third inclined side surface and the fourth inclined side surface; and - Each of the third and fourth inclined side surfaces (33, 34) includes a first sub-surface (33', 34') on the first side of the second chip deflector (60) and a second sub-surface (33", 34") on the opposite second side of the second chip deflector (60).

12. The double-sided cutting blade according to claim 11, characterized in that, The first main side surface and the second main side surface (11, 12) are positioned opposite each other on opposite sides of the central axis (C) of the cutting blade (1).

13. The double-sided cutting blade according to claim 11, characterized in that, Each of the inclined side surfaces (31-34) is configured to serve as an abutment surface of the cutting insert (1) in at least one working position of the cutting insert, and abuts against the corresponding support surface (87) in the insert holder (84) in the cutter body (81) of the milling cutter when the cutting insert (1) is mounted in the at least one working position.

14. The double-sided cutting blade according to claim 11, characterized in that, The cutting blade includes: - A first curved corner cutting edge (25a) and a first surface wiping cutting edge (26a) are formed at the intersection between the outer peripheral surface (10) and the first main surface (2), wherein the first main cutting edge (21), the first curved corner cutting edge (25a) and the first surface wiping cutting edge (26a) are arranged one after another, wherein the first curved corner cutting edge (25a) is located between the first main cutting edge (21) and the first surface wiping cutting edge (26a); - A second curved corner cutting edge (25b) and a second surface wiping cutting edge (26b), the second curved corner cutting edge (25b) and the second surface wiping cutting edge (26b) are formed at the intersection between the outer peripheral surface (10) and the second main surface (3), wherein the second main cutting edge (22), the second curved corner cutting edge (25b) and the second surface wiping cutting edge (26b) are arranged one after another, wherein the second curved corner cutting edge (25b) is located between the second main cutting edge (22) and the second surface wiping cutting edge (26b); - A third curved corner cutting edge (25c) and a third surface wiping cutting edge (26c), the third curved corner cutting edge (25c) and the third surface wiping cutting edge (26c) being formed at the intersection between the outer peripheral surface (10) and the first main surface (2), wherein the third main cutting edge (23), the third curved corner cutting edge (25c) and the third surface wiping cutting edge (26c) are arranged one after another, wherein the third curved corner cutting edge (25c) is located between the third main cutting edge (23) and the third surface wiping cutting edge (26c); and - A fourth curved corner cutting edge (25d) and a fourth surface wiping cutting edge (26d) are formed at the intersection between the outer peripheral surface (10) and the second main surface (3), wherein the fourth main cutting edge (24), the fourth curved corner cutting edge (25d) and the fourth surface wiping cutting edge (26d) are arranged one after another, wherein the fourth curved corner cutting edge (25d) is located between the fourth main cutting edge (24) and the fourth surface wiping cutting edge (26d).

15. The double-sided cutting insert according to any one of claims 1-3, characterized in that, The cutting insert is a square shoulder milling insert (1) or a face milling insert (1').

16. The double-sided cutting insert according to any one of claims 1-3, characterized in that, The cutting insert (1; 1'; 1") has 360° / n rotational symmetry about the central axis (C) of the cutting insert, where n is an integer of 2 or greater.

17. The double-sided cutting blade according to claim 16, characterized in that, n is 3, 4, 5, 6, 7 or 8.

18. A milling tool comprising at least one double-sided cutting insert (1; 1'; 1") according to any one of claims 1-17.

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