Indexable cutting insert and cutting tool

Abstract

The application discloses an indexable cutting blade and a cutting tool, and relates to the technical field of metal cutting, which comprises a front surface, a rear surface and a peripheral side surface, the peripheral side surface is arranged between the front surface and the rear surface and extends along the circumference of the indexable cutting blade, a cutting edge is formed between the peripheral side surface and the front surface, the front surface comprises a reference plane, a first rake surface and a second rake surface, a first included angle alpha 1 is formed between the first rake surface and the reference plane, a second included angle alpha 2 is formed between the second rake surface and the reference plane, and the second included angle alpha 2 is smaller than the first included angle alpha 1. The indexable cutting blade of the technical scheme works in the large rake angle area of the first rake surface when the cutting depth is small and the feed is large, so that the sharpness and surface quality are ensured, and when the cutting depth is large, the small rake angle area of the second rake surface is involved in the work, so that sufficient cutting edge strength and impact resistance are provided. The dynamic adaptability greatly expands the applicable machining range of the indexable cutting blade.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of metal cutting, in particular to a indexable cutting insert and a cutting tool. BACKGROUND

[0002] In the technical field of metal cutting, indexable cutting inserts are widely used due to their economy and convenience. However, the existing indexable cutting inserts often have compromised performance. In order to balance finishing, a large rake angle is adopted, which results in insufficient strength of the cutting edge and makes it difficult to cope with rough machining conditions with large cutting depth and high load. In order to enhance the performance of rough machining, a small rake angle is adopted, which results in excessive cutting force and poor surface quality during finishing. SUMMARY

[0003] The present application aims to at least partially solve one of the problems in the related art. To this end, the present application provides an indexable cutting insert.

[0004] To achieve the above-mentioned purpose, the first aspect of the present application discloses an indexable cutting insert, which comprises a front surface, a rear surface and a peripheral side surface, the peripheral side surface is arranged between the front surface and the rear surface and extends along the circumference of the indexable cutting insert, a cutting edge is formed between the peripheral side surface and the front surface, the cutting edge comprises a first cutting edge and a second cutting edge, the second cutting edge is arranged at the corner of the indexable cutting insert, and the first cutting edge is arranged between two adjacent second cutting edges.

[0005] The front surface comprises:

[0006] a reference plane arranged within the profile range of the cutting edge;

[0007] a first rake surface arranged between the cutting edge and the reference plane, the first rake surface extends from the inner side of the second cutting edge to the inner side of the first cutting edge at both ends of the second cutting edge, a plurality of first rake surfaces are arranged in intervals along the circumference of the indexable cutting insert, the first rake surface is arranged obliquely from its outer edge to the reference plane and to the rear surface, a reference plane is made through the center line of the indexable cutting insert, a straight line segment formed by the intersection of the first rake surface and the reference plane forms a first included angle a1 with the reference plane;

[0008] a second rake surface arranged between the cutting edge and the reference plane, the second rake surface is arranged at the inner side of the first cutting edge to separate two adjacent first rake surfaces, the second rake surface is arranged obliquely from its outer edge to the reference plane and to the rear surface, the second rake surface is a plane and forms a second included angle a2 with the reference plane, and the second included angle a2 is smaller than the first included angle a1.

[0009] In some embodiments of the present application, the interface between the first rake surface and the second rake surface forms an arc structure.

[0010] In some embodiments of the present application, the inner edge of the second rake surface is recessed away from the center line of the indexable cutting insert.

[0011] In some embodiments of the present application, the first included angle a1 gradually increases in the direction from the second cutting edge to the first cutting edge.

[0012] In some embodiments of the present application, the first included angle a1 is less than 30°.

[0013] In some embodiments of the present application, the second included angle a2 is not greater than 5°.

[0014] In some embodiments of the present application, when viewed from the top of the front surface, the extension length of the first cutting edge is L1, the length of the second rake surface in the extension direction of the first cutting edge is L2, and 1 / 2≤L2 / L1≤3 / 4 is satisfied.

[0015] In some embodiments of the present application, the front surface further comprises a third rake surface arranged between the second rake surface and the reference plane, and the second rake surface is higher than the third rake surface relative to the reference plane, with the direction from the back surface to the front surface being defined as the height direction.

[0016] The third rake surface is arranged inclined from its outer edge towards the reference plane and towards the back surface, the third rake surface is a plane and forms a third included angle a3 with the reference plane, and the third included angle a3 is greater than the second included angle a2.

[0017] In some embodiments of the present application, the third included angle a3 is not greater than 35°.

[0018] In some embodiments of the present application, when viewed from the top of the front surface, in the direction perpendicular to the extension direction of the first cutting edge, the maximum width of the second rake surface is W1, and the distance between the middle position of the third rake surface in the extension direction of the first cutting edge and the first cutting edge is W2, and 1 / 4≤W2 / W1≤3 / 4 is satisfied.

[0019] In some embodiments of the present application, the front surface further comprises a fourth rake surface arranged between the first rake surface and the reference plane, the fourth rake surface is arranged inclined from its outer edge towards the reference plane and towards the back surface, and a straight line segment formed by the intersection of the fourth rake surface and the reference plane forms a fourth included angle a4 with the reference plane, and the fourth included angle a4 is greater than the first included angle a1.

[0020] In some embodiments of the present application, the fourth included angle a4 is greater than 45°.

[0021] In some embodiments of the present application, the first cutting edge is symmetrically arc-shaped, the direction from the back surface to the front surface is defined as the height direction, and the height of the two ends of the first cutting edge is greater than the height of the center thereof.

[0022] A second aspect of the present application discloses a cutting tool, comprising a tool body and the indexable cutting insert as described above, the tool body is provided with at least one mounting seat, and the indexable cutting insert is detachably connected to the mounting seat.

[0023] The indexable cutting insert of the technical scheme of the present application works in the large rake angle region of the first rake surface when the cutting depth is small and the feed is large, so as to ensure sharpness and surface quality, and works in the small rake angle region of the second rake surface when the cutting depth is large, so as to provide sufficient cutting edge strength and impact resistance, which greatly expands the applicable machining range of the indexable cutting insert.

[0024] Other advantages of the present application will be given in part in the following description, will become apparent in part from the following description, or will be learned by practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description. Obviously, the drawings in the following description only show some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from the structures shown in the drawings without creative labor.

[0026] Figure 1 The schematic diagram of the indexable cutting insert in some embodiments;

[0027] Figure 2 The schematic diagram of the indexable cutting insert in some embodiments; Figure 1 The top view of the indexable cutting insert shown in the schematic diagram;

[0028] Figure 3 The P-P cross-sectional view of the indexable cutting insert shown in the schematic diagram; Figure 2

[0029] Figure 4 The P-P cross-sectional view of the indexable cutting insert shown in the schematic diagram; Figure 2

[0030] The schematic diagram of another indexable cutting insert in some embodiments; Figure 5

[0031] Figure 6 ​​Fig. 1 shows a schematic view of a cutting tool according to some embodiments.

[0032] Reference signs:

[0033] Indexable cutting insert 100, front surface 110, first rake surface 111, second rake surface 112, third rake surface 113, fourth rake surface 114, reference plane 115, land width 116, rear surface 120, peripheral surface 130, cutting edge 140, first cutting edge 141, second cutting edge 142, fastening hole 150, center line 151, corner 160, tool body 200, mounting seat 210, screw 220.

[0034] The implementation, functional features and advantages of the present application will be further described with reference to the embodiments in conjunction with the drawings. DETAILED DESCRIPTION

[0035] Embodiments of the present application are described below in detail, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary only, and are used only for the purpose of explaining the present application, and cannot be understood as limiting the present application.

[0036] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the features defined as "first", "second" can be explicitly or implicitly included one or more features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0037] In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0038] A first aspect of the present application discloses a indexable cutting insert 100, in some embodiments, in combination with Figures 1 to 5 As shown, the indexable cutting insert 100 comprises a front surface 110, a rear surface 120 and a peripheral side surface 130, the peripheral side surface 130 is disposed between the front surface 110 and the rear surface 120 and extends along a circumferential direction of the indexable cutting insert 100, a cutting edge 140 is formed between the peripheral side surface 130 and the front surface 110, the cutting edge 140 comprises a first cutting edge 141 and a second cutting edge 142, the second cutting edge 142 is disposed at a corner 160 of the indexable cutting insert 100, the first cutting edge 141 is disposed between two adjacent second cutting edges 142;

[0039] The front surface 110 comprises a reference plane 115, a first rake surface 111 and a second rake surface 112; the reference plane 115 is disposed within a profile range of the cutting edge 140; the first rake surface 111 is disposed between the cutting edge 140 and the reference plane 115, and the first rake surface 111 extends from an inner side of the second cutting edge 142 towards an inner side of the first cutting edge 141 at two ends of the second cutting edge 142, a plurality of first rake surfaces 111 are arranged at intervals along the circumferential direction of the indexable cutting insert 100, the first rake surface 111 is disposed obliquely from an outer edge thereof towards the reference plane 115 and towards the rear surface 120, with reference to a reference plane passing through a center line 151 of the indexable cutting insert, a straight line segment formed by the intersection of the first rake surface 111 and the reference plane forms a first included angle a1 with the reference plane 115; the second rake surface 112 is disposed between the cutting edge 140 and the reference plane 115, and the second rake surface 112 is disposed at an inner side of the first cutting edge 141 to separate two adjacent first rake surfaces 111, the second rake surface 112 is disposed obliquely from an outer edge thereof towards the reference plane 115 and towards the rear surface 120, the second rake surface 112 is a plane and forms a second included angle a2 with the reference plane 115, the second included angle a2 is smaller than the first included angle a1.

[0040] Specifically, the indexable cutting insert 100 is generally in a cubic structure, of course, other three-dimensional structures are also possible, one end surface of the indexable cutting insert 100 constitutes the front surface 110, the other opposite end surface constitutes the rear surface 120, and the surface of the indexable cutting insert 100 between the front surface 110 and the rear surface 120 constitutes the peripheral side surface 130, the peripheral side surface 130 extends along the circumferential direction of the indexable cutting insert 100, thus the cutting edge 140 can be formed between the peripheral side surface 130 and the front surface 110, and generally the blade width band 116 is also provided between the cutting edge 140 and the front surface 110. It can be understood that the indexable cutting insert 100 has a fastening hole 150, the fastening hole 150 penetrates from the front surface 110 to the rear surface 120, the fastening hole 150 is used for the fastener (such as a screw 220) to pass through so as to fix the indexable cutting insert 100 to a predetermined position (such as a mounting seat 210 mentioned below).

[0041] The cutting edges 140 include first cutting edges 141 and second cutting edges 142, the second cutting edges 142 are arranged at the corners 160 of the indexable cutting insert 100, and the first cutting edges 141 are arranged between two adjacent second cutting edges 142. Referring to Figure 1 and Figure 5 As shown, the indexable cutting insert 100 has four corners 160, which can be in the form of a circular arc or a straight line. The cutting edges 140 formed between the front surface 110 and the peripheral surface 130 include four second cutting edges 142 and four first cutting edges 141. The second cutting edges 142 are arranged at the corners 160 of the indexable cutting insert 100, and the first cutting edges 141 are arranged between two adjacent second cutting edges 142.

[0042] The front surface 110 includes a reference plane 115, a first rake surface 111 and a second rake surface 112. The reference plane 115 is arranged within the profile of the cutting edges 140. When viewed from above, the cutting edges 140 surround the reference plane 115 and are arranged alternately with the reference plane 115. The first rake surface 111 and the second rake surface 112 are arranged between the cutting edges 140 and the reference plane 115, respectively.

[0043] The first rake surface 111 extends from the inner side of the second cutting edge 142 to the inner side of the first cutting edge 141 at both ends of the second cutting edge 142. In this way, part of the first rake surface 111 is located on the inner side of the second cutting edge 142, and the other part is located on the inner side of the first cutting edge 141. A plurality of first rake surfaces 111 are arranged along the circumferential direction of the indexable cutting insert 100. Figure 1 and Figure 5 As shown, the indexable cutting insert 100 has four corners 160, and therefore has four first rake surfaces 111. The second rake surface 112 is arranged on the inner side of the first cutting edge 141 and separates two adjacent first rake surfaces 111, i.e. along the circumferential direction of the indexable cutting insert 100, two adjacent first rake surfaces 111 are separated by the second rake surface 112, which is equivalent to the second rake surface 112 dividing different functional areas, so as to cope with complex working environments and improve applicability. It can be understood that the position relatively close to the center line 151 (the center line 151 is the central axis of the fastening hole 150) of the indexable cutting insert 100 is regarded as the inner side, and the position relatively far away from the center line 151 of the indexable cutting insert 100 is regarded as the outer side.

[0044] Further, the first rake surface 111 is arranged to be inclined from its outer edge towards the reference plane 115 and the rear surface 120, for example, the first rake surface 111 and the land 116 meet, and the land 116 is arranged to be inclined from the land 116 towards the reference plane 115 and the rear surface 120, with reference to the center line 151 of the indexable cutting insert as a reference plane (i.e. the center line 151 is located in the reference plane), the straight line segment formed by the intersection of the first rake surface 111 and the reference plane and the reference plane 115 forms a first included angle a1. The second rake surface 112 is arranged to be inclined from its outer edge towards the reference plane 115 and the rear surface 120, for example, the second rake surface 112 and the land 116 meet, and the land 116 is arranged to be inclined from the land 116 towards the reference plane 115 and the rear surface 120, the second rake surface 112 is a plane and forms a second included angle a2 with the reference plane 115, the second included angle a2 is smaller than the first included angle a1.

[0045] The first rake surface 111 is arranged to be inclined from its outer edge towards the reference plane 115 and the rear surface 120, and the second rake surface 112 is arranged to be inclined from its outer edge towards the reference plane 115 and the rear surface 120, i.e. the first included angle a1 and the second included angle a2 are respectively smaller than 90°, in this embodiment, the second included angle a2 is smaller than the first included angle a1, so that the first rake surface 111 with large rake angle region works in small cutting depth and large feed, to ensure sharpness and surface quality, and the second rake surface 112 with small rake angle region works in large cutting depth, to provide sufficient cutting edge strength and impact resistance, which greatly expands the applicable machining range of the indexable cutting insert 100. It can be understood that the reference plane can be at any position around the center line 151 of the indexable cutting insert, so as to intersect with the first rake surface 111 at any position to form the first included angle a1.

[0046] In some embodiments, in combination with Figure 1 and Figure 2 It is shown that the interface boundary between the first rake surface 111 and the second rake surface 112 forms an arc structure. In this embodiment, the arc structure includes but is not limited to an arc line and an arc surface, for example, the arc structure is formed as an arc line when viewed from the front surface 110. Through the arrangement of the arc structure, the interface boundary between the first rake surface 111 and the second rake surface 112 can provide a gradual buffer zone, which can cope with complex machining environment and ensure stable machining performance, and also can make the chip begin to curl along the second rake surface 112 in the process from the first rake surface 111 to the second rake surface 112, to avoid the problems of concentrated cutting and too small curling angle.

[0047] In some embodiments, in combination with Figure 1 and Figure 2As shown, the inner edge of the second rake face 112 is concave away from the center line 151 of the indexable cutting insert 100.

[0048] In the present embodiment, the inner edge of the second rake face 112 is concave away from the center line 151 of the indexable cutting insert 100, so that when the indexable cutting insert 100 is working at a large cutting depth, the chip enters the second rake face 112 with high load resistance, which can avoid excessive contact area and prevent the cutting heat from concentrating on the indexable cutting insert 100 to cause thermal damage, thereby helping to prolong the service life of the indexable cutting insert 100.

[0049] In some embodiments, in combination with Figures 1 to 3 As shown, the first included angle α1 gradually increases in the direction from the second cutting edge 142 to the first cutting edge 141.

[0050] In the present embodiment, the gradual change of the first included angle α1 can make the indexable cutting insert 100 have a sharp rake angle in the cutting mode of small cutting depth and large feed, which can guarantee the processing efficiency while taking into account the surface quality of the processing, and the arrangement of the rake angle corresponding to the first rake face 111 is more reasonable, which can avoid the tool damage caused by the excessive angle of part of the rake angle (near the corner 160) and improve the service life of the tool.

[0051] In some embodiments, in combination with Figures 1 to 3 As shown, the first included angle α1 is less than 30°. It can be understood that the first included angle α1 can be any value within the range of less than 30°, for example, the first included angle α1 can be but not limited to 25°, 20°, 15°, etc. By satisfying the allowable range of the first included angle α1, the finishing performance is further optimized.

[0052] In some embodiments, in combination with Figures 1 to 4 As shown, the second included angle α2 is not greater than 5°. It can be understood that the second included angle α2 can be any value within the range of not greater than 5°, for example, the second included angle α2 can be but not limited to 5°, 4°, 3°, 2°, etc. By satisfying the allowable range of the second included angle α2, the second rake face 112 has a small-angle rake angle, which improves the strength and cutting resistance of the indexable cutting insert 100, and guarantees a higher service life and applicability in a large cutting depth and harsh processing environment.

[0053] In some embodiments, in combination with Figure 1 and Figure 2As shown, the first cutting edge 141 has an extension length L1, and the second rake surface 112 has a length L2 along the extension direction of the first cutting edge 141, and 1 / 2≤L2 / L1≤3 / 4 is satisfied. It can be understood that the ratio of L2 and L1 can be any value in the range of 1 / 2 to 3 / 4, for example, L2 / L1 can be, but is not limited to, 1 / 2, 2 / 3, 3 / 4, etc. By controlling the ratio of L2 and L1 within the above-mentioned allowable range, the stability of the performance of the indexable cutting insert 100 in general working conditions and harsh environments can be controlled, and the performance of the indexable cutting insert 100 during the working condition switching process can be effectively guaranteed based on the setting of the joint boundary of the first rake surface 111 and the second rake surface 112.

[0054] In some embodiments, in combination with Figures 1 to 4 As shown, the front surface 110 further includes a third rake surface 113 disposed between the second rake surface 112 and the reference plane 115, and the second rake surface 112 is higher than the third rake surface 113 relative to the reference plane 115 in the height direction defined by the direction from the rear surface 120 to the front surface 110; the third rake surface 113 is inclinedly disposed from the outer edge thereof toward the reference plane 115 and toward the rear surface 120, the third rake surface 113 is a plane and forms a third included angle a3 with the reference plane 115, and the third included angle a3 is greater than the second included angle a2.

[0055] In the present embodiment, the second rake surface 112 and the third rake surface 113 are circularly arc transitioned, and the third rake surface 113 and the reference plane 115 are circularly arc transitioned. When the indexable cutting insert 100 is used for cutting, the cutting passes through the second rake surface 112, the cutting resistance is large, and the cutting load is high, and the chip flows to the third rake surface 113 with a large angle after passing through the second rake surface 112 with a small angle, so that a large amount of load can be released.

[0056] Optionally, the third included angle a3 is not greater than 35°. It can be understood that the third included angle a3 can be any value in the range of not greater than 35°, for example, the third included angle a3 can be, but is not limited to, 35°, 30°, 25°, 20°, 15°, etc. By satisfying the third included angle a3 in the above-mentioned allowable range, the load release is further enhanced. Moreover, by limiting the third included angle a3, not only the third rake surface 113 can smoothly break the cutting, effectively avoiding the entanglement and accumulation of the cutting, but also a "thermal isolation zone" can be established between the indexable cutting insert 100 and the cutting, so that the transmission of cutting heat to the indexable cutting insert 100 is greatly reduced.

[0057] In some embodiments, in combination with Figure 1 and Figure 2As shown, the maximum width of the second rake surface 112 along the front surface 110 in a direction perpendicular to the extension direction of the first cutting edge 141 is W1, and the distance between the middle position of the third rake surface 113 along the extension direction of the first cutting edge 141 and the first cutting edge 141 is W2, which satisfies 1 / 4≤W2 / W1≤3 / 4.

[0058] It can be understood that the ratio of W2 / W1 can be any value in the range of 1 / 4 to 3 / 4, for example, W2 / W1 can be but is not limited to 1 / 4, 1 / 2, 3 / 4, etc. Since the second rake surface 112 has high strength and high cutting resistance, and the cutting heat generated by the second rake surface 112 is high relative to other rake surfaces, by optimizing the ratio of W2 / W1, the contact area and time between the workpiece and the indexable cutting insert 100 in the area where the cutting heat is most concentrated can be controlled, so that the cutting heat is directly taken away by the chip, and the temperature is prevented from being too high to be transferred to the indexable cutting insert 100.

[0059] In some embodiments, in combination with Figures 1 to 3 As shown, the front surface 110 further comprises a fourth rake surface 114 disposed between the first rake surface 111 and the reference plane 115. The fourth rake surface 114 is inclined from the outer edge thereof toward the reference plane 115 and toward the rear surface 120. The straight line segment formed by the intersection of the fourth rake surface 114 and the reference plane 115 and the reference plane 115 forms a fourth included angle a4. The fourth included angle a4 is greater than the first included angle a1. In this way, the cutting heat generated during cutting can be reduced and transferred to the indexable cutting insert 100. The first rake surface 111 can be arc transitioned with the fourth rake surface 114, and the fourth rake surface 114 can be arc transitioned with the reference plane 115.

[0060] Optionally, the fourth included angle a4 is greater than 45°. It can be understood that the fourth included angle a4 can be any value in the range of greater than 45°, for example, the fourth included angle a4 can be but is not limited to 50°, 55°, 60°, etc. By satisfying the allowable range of the fourth included angle a4, the cutting process is concentrated on the first rake surface 111, the cutting heat generated is effectively reduced and transferred to the indexable cutting insert 100, and thermal damage to the indexable cutting insert 100 is avoided.

[0061] At the same time, by optimizing the combination of the angles of the first rake surface 111, the second rake surface 112, the third rake surface 113, and the fourth rake surface 114, stress concentration is avoided, plastic deformation, chipping, and thermal cracks of the indexable cutting insert 100 are fundamentally inhibited, and the service life of the indexable cutting insert 100 is multiplied.

[0062] In some embodiments, in combination with Figure 1 and Figure 5As shown, the first cutting edge 141 is symmetrically arc-shaped, and the height direction is defined as the direction from the rear surface 120 to the front surface 110. The heights of the two ends of the first cutting edge 141 are greater than the height of the center thereof. In this way, a positive rake angle is provided, which reduces the cutting force and makes the cutting applicable to a wider range and more applicable.

[0063] A second aspect of the present application discloses a cutting tool, in some embodiments, in combination with Figures 1 to 6 As shown, the cutting tool comprises a tool body 200 and the indexable cutting insert 100 described above.

[0064] The indexable cutting insert 100 comprises a front surface 110, a rear surface 120, and a peripheral side surface 130 arranged between the front surface 110 and the rear surface 120 and extending along the circumferential direction of the indexable cutting insert 100. A cutting edge 140 is formed between the peripheral side surface 130 and the front surface 110, and the cutting edge 140 comprises a first cutting edge 141 and a second cutting edge 142. The second cutting edge 142 is arranged at a corner 160 of the indexable cutting insert 100, and the first cutting edge 141 is arranged between two adjacent second cutting edges 142.

[0065] The front surface 110 comprises a reference plane 115, a first rake surface 111, and a second rake surface 112. The reference plane 115 is arranged within the profile range of the cutting edge 140. The first rake surface 111 is arranged between the cutting edge 140 and the reference plane 115, and the first rake surface 111 extends from the inner side of the second cutting edge 142 to the inner side of the first cutting edge 141 at the two ends of the second cutting edge 142. A plurality of first rake surfaces 111 are arranged at intervals along the circumferential direction of the indexable cutting insert 100. The first rake surface 111 is arranged obliquely from the outer edge thereof toward the reference plane 115 and the rear surface 120. With reference to a reference plane passing through the center line 151 of the indexable cutting insert, the first rake surface 111 and the reference plane intersect to form a straight line segment, and the straight line segment and the reference plane 115 form a first included angle α1. The second rake surface 112 is arranged between the cutting edge 140 and the reference plane 115, and the second rake surface 112 is arranged at the inner side of the first cutting edge 141 to separate two adjacent first rake surfaces 111. The second rake surface 112 is arranged obliquely from the outer edge thereof toward the reference plane 115 and the rear surface 120. The second rake surface 112 is a plane and forms a second included angle α2 with the reference plane 115, and the second included angle α2 is smaller than the first included angle α1.

[0066] The tool body 200 is provided with at least one mounting seat 210, and the indexable cutting insert 100 is detachably connected to the mounting seat 210. Specifically, a screw 220 passes through the fastening hole 150 to fix the indexable cutting insert 100 to the mounting seat 210.

[0067] Through the cooperation of the tool body 200 and the indexable cutting insert 100, the same indexable cutting insert 100 can be used for left cutting, right cutting and other processes, reducing tool inventory and tool changing time, convenient operation and cost saving. It can be understood that the indexable cutting insert 100 of the cutting tool of the embodiment adopts the technical solutions of the above-mentioned embodiments, and therefore at least has the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here.

[0068] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the exemplary description of the above terms does not necessarily mean the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0069] Although the embodiments of the present application have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. An indexable cutting insert, characterized by The indexable cutting insert comprises a front surface (110), a rear surface (120), and a peripheral side surface (130) disposed between the front surface (110) and the rear surface (120) and extending along a peripheral direction of the indexable cutting insert, a cutting edge (140) is formed between the peripheral side surface (130) and the front surface (110), the cutting edge (140) comprises first cutting edges (141) and second cutting edges (142), the second cutting edges (142) are disposed at corners (160) of the indexable cutting insert, and the first cutting edges (141) are disposed between two adjacent second cutting edges (142); The front surface (110) comprises: a reference plane (115) disposed within a profile range of the cutting edge (140); a first rake surface (111) disposed between the cutting edge (140) and the reference plane (115), and extending from an inner side of the second cutting edge (142) to an inner side of the first cutting edge (141) at two ends of the second cutting edge (142), a plurality of the first rake surfaces (111) are arranged at intervals along the peripheral direction of the indexable cutting insert, the first rake surface (111) is inclined from an outer edge thereof to the reference plane (115) and to the rear surface (120), and a straight line segment formed by intersection of the first rake surface (111) and a reference plane passing through a center line (151) of the indexable cutting insert forms a first included angle a1 with the reference plane (115); a second rake surface (112) disposed between the cutting edge (140) and the reference plane (115), and disposed at an inner side of the first cutting edge (141) to separate two adjacent first rake surfaces (111), the second rake surface (112) is inclined from an outer edge thereof to the reference plane (115) and to the rear surface (120), the second rake surface (112) is a plane and forms a second included angle a2 with the reference plane (115), and the second included angle a2 is smaller than the first included angle a1; a third rake surface (113) disposed between the second rake surface (112) and the reference plane (115), and defining a height direction from the rear surface (120) to the front surface (110), the second rake surface (112) is higher than the third rake surface (113) relative to the reference plane (115), the third rake surface (113) is inclined from an outer edge thereof to the reference plane (115) and to the rear surface (120), the third rake surface (113) is a plane and forms a third included angle a3 with the reference plane (115), and the third included angle a3 is greater than the second included angle a2.

2. The indexable cutting insert according to claim 1, wherein An interface boundary between the first rake surface (111) and the second rake surface (112) forms an arc structure.

3. The indexable cutting insert according to claim 1, wherein An inner edge of the second rake surface (112) is recessed away from a center line (151) of the indexable cutting insert.

4. The indexable cutting insert according to claim 1, wherein The first included angle (α1) gradually increases in a direction from the second cutting edge (142) to the first cutting edge (141).

5. The indexable cutting insert according to claim 1, wherein The first included angle (α1) is less than 30°.

6. The indexable cutting insert according to claim 1, wherein The second included angle (α2) is not greater than 5°.

7. The indexable cutting insert according to claim 1, wherein Viewing the front surface (110) from above, an extension length of the first cutting edge (141) is L1, a length of the second rake surface (112) in an extension direction of the first cutting edge (141) is L2, and 1 / 2≤L2 / L1≤3 / 4 is satisfied.

8. The indexable cutting insert according to claim 1, wherein The third included angle (α3) is not greater than 35°.

9. The indexable cutting insert according to claim 1, wherein Viewing the front surface (110) from above, in a direction perpendicular to an extension direction of the first cutting edge (141), a maximum width of the second rake surface (112) is W1, a distance between a middle position of the second rake surface (112) in the extension direction of the first cutting edge (141) and the first cutting edge (141) is W2, and 1 / 4≤W2 / W1≤3 / 4 is satisfied.

10. The indexable cutting insert according to claim 1, wherein The front surface (110) further comprises a fourth rake surface (114) disposed between the first rake surface (111) and the reference plane (115), the fourth rake surface (114) is inclined from an outer edge thereof towards the reference plane (115) and towards the rear surface (120), a straight line segment formed by the intersection of the fourth rake surface (114) and the reference plane forms a fourth included angle (α4) with the reference plane (115), and the fourth included angle (α4) is greater than the first included angle (α1).

11. The indexable cutting insert according to claim 10, wherein The fourth included angle (α4) is greater than 45°.

12. The indexable cutting insert according to claim 1, wherein The first cutting edge (141) is a symmetrical circular arc, a direction from the rear surface (120) to the front surface (110) is defined as a height direction, and heights of two ends of the first cutting edge (141) are greater than a height of a center thereof.

13. A cutting tool characterized by The indexable cutting insert according to any one of claims 1 to 12, and a tool body (200) provided with at least one mounting seat (210), wherein the indexable cutting insert is detachably connected to the mounting seat (210).

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