Indexable cutting insert and cutting tool
By designing a polygonal insert body and a chip-breaking protrusion that work in tandem, the problem of unstable cutting under different parameters is solved, achieving stable cutting and efficient machining.
Patent Information
- Application Number
- CN202520339371.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-28
- Publication Date
- 2026-01-30
- Estimated Expiration
- 2035-02-28
AI Technical Summary
Existing cutting inserts are difficult to achieve stable and controllable chip breaking and chip removal under different machining parameters, resulting in unstable cutting process and low machining efficiency.
Design an indexable cutting insert, including a polygonal insert body, an arc-shaped cutting edge and multiple side cutting edges, and a chip-breaking protrusion on the angle bisector of the arc-shaped cutting edge. Through the linkage between the chip-breaking protrusion and the multiple side cutting edges, the chip curling and breaking and stable cutting are achieved.
Maintaining stability in the cutting process under different cutting parameters reduces vibration and offset, improves machining efficiency, reduces cutting resistance, and ensures smooth chip removal.
Smart Images
Figure CN223848235U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of cutting tools, in particular to a indexable cutting insert and a cutting tool. BACKGROUND
[0002] In the process of metal cutting, many metal processing enterprises usually adopt a tool for rough and fine machining in order to pursue higher machining efficiency and convenient tool management. In this case, different machining parameters may be involved, so that the chip breaking performance of the tool is required to be high, and higher universality is required. Therefore, when designing the insert groove, it is necessary to realize chip removal and chip winding under different feeds and different cutting depths as much as possible, so as to ensure a stable and controllable cutting process. CONTENT OF THE UTILITY MODEL
[0003] The present application provides an indexable cutting insert and a cutting tool. The problem of the prior art that an indexable cutting insert with good cutting performance is urgently needed can be solved, and the technical solution is as follows:
[0004] In one aspect, an indexable cutting insert is provided, which comprises:
[0005] An insert body, the insert body is a polygonal body, the insert body has an upper surface and a bottom surface oppositely arranged along a first direction, and a side surface connecting the upper surface and the bottom surface, and the upper surface and the side surface intersect to form a cutting edge;
[0006] The cutting edge comprises a circular arc cutting edge at a tool tip position and two side cutting edges arranged on both sides of the circular arc cutting edge, the circular arc cutting edge connects the two side cutting edges, and each side cutting edge comprises a first side edge, a second side edge, a third side edge and a fourth side edge arranged in sequence in a direction away from the circular arc cutting edge;
[0007] The upper surface is provided with a chip breaking protrusion extending and distributed along an angle bisector of the circular arc cutting edge, and the height of the chip breaking protrusion gradually increases in a direction away from the circular arc cutting edge;
[0008] Wherein, the circular arc cutting edge is parallel to the bottom surface, the first side edge is tangent to and coplanar with the circular arc cutting edge; the second side edge is a straight line edge and is inclined toward the bottom surface; the third side edge is a circular arc edge tangent to the second side edge and curved toward the bottom surface; and the fourth side edge is a straight line edge tangent to the third side edge and parallel to the first side edge.
[0009] Optionally, the included angle between the side surface and a vertical plane is in the range of 5 degrees to 11 degrees, and the vertical plane is a plane passing through the cutting edge and parallel to the first direction.
[0010] Optionally, the height difference between the fourth side edge and the first side edge in the first direction is 0.05-0.15 mm.
[0011] Optionally, the length of the first side edge is 0.1-0.3 mm, the length of the second side edge is 0.3-0.8 mm, and the radius of the third side edge is 4-8 mm.
[0012] Optionally, the included angle between the second side edge and a first horizontal plane is 5-10 degrees, the first horizontal plane is parallel to the first side edge and is perpendicular to the first direction; and the upper surface has a land surface connected to the cutting edge, and a rake surface distributed on the side of the land surface away from the cutting edge, the rake surface being inclined towards the bottom surface relative to the land surface.
[0013] Optionally, the land surface is parallel to the bottom surface, and the width of the land surface is 0.04-0.08 mm.
[0014] Optionally, the rake surface comprises a first rake surface corresponding to the arc cutting edge, and a second rake surface and a third rake surface arranged in sequence along the extension direction of the side cutting edge.
[0015] Optionally, the inclination angle of the first rake surface is 10-18 degrees, and the inclination angle of the third rake surface is 5-10 degrees; the second rake surface comprises a circular-arc concave surface and a circular-arc convex surface connected to each other, one side of the circular-arc concave surface away from the circular-arc convex surface being connected to the first rake surface, and one side of the circular-arc convex surface away from the circular-arc concave surface being connected to the third rake surface.
[0016] Optionally, the upper surface is provided with a chip breaker extending and distributed along the angle bisector of the arc cutting edge, the chip breaker being distributed on the side of the rake surface away from the land surface.
[0017] Optionally, the chip breaker has a top surface located at the top of the chip breaker and parallel to the bottom surface, and two chip breaker side surfaces distributed on both sides of the top surface, the two chip breaker side surfaces being inclined towards the angle bisector of the arc cutting edge, and the connection of one side of the two chip breaker side surfaces close to the arc cutting edge forming an arc convex surface, the distance between the chip breaker side surface and the cutting edge gradually increasing in the direction from the arc cutting edge to the side cutting edge.
[0018] Optionally, the included angle between the center line of the arc convex surface and a second horizontal plane is 10-15 degrees, the second horizontal plane being a plane parallel to the top surface.
[0019] In another aspect, there is provided a cutting tool comprising a tool body and an indexable cutting insert, an insert body of the indexable cutting insert being mounted to the tool body, the indexable cutting insert being any one of the indexable cutting inserts given above.
[0020] The technical solutions provided by the embodiments of the present application have at least the following beneficial effects:
[0021] By providing a plurality of side edges cooperating with the arc cutting edge in the side cutting edge of the insert body, and providing a chip breaking protrusion on the angle bisector of the arc cutting edge, the design of the chip breaking protrusion and the plurality of side edges is linked. In this way, when cutting with small parameters, especially when the cutting depth is less than the radius of the arc cutting edge, the chip flows from the arc cutting edge to the chip breaking protrusion, and the chip is curled and broken by the contact and collision of the chip breaking protrusion at the corresponding position. When cutting with large parameters, the chip breaking protrusion cooperates with the plurality of side edges, and the second side edge and the third side edge in the plurality of side edges form a positive edge inclination at the side edge position, which helps to maintain stability during cutting, reduces vibration and deviation. The height of part of the side edges in the side cutting edge is lower than that of the arc cutting edge, which can make the cutting easier to chip and discharge, reduce chip accumulation, thereby reducing cutting resistance and improving processing efficiency. BRIEF DESCRIPTION OF DRAWINGS
[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.
[0023] Figure 1 is a structural schematic diagram of an indexable cutting insert provided by an embodiment of the present application;
[0024] Figure 2 is Figure 1 is a partial enlarged schematic view at A;
[0025] Figure 3 is Figure 1 is a front view of the indexable cutting insert shown;
[0026] Figure 4 is Figure 3 is a partial enlarged schematic view at B;
[0027] Figure 5 is a partial structural schematic diagram of an indexable cutting insert provided by an embodiment of the present application;
[0028] Figure 6 is a top view of an indexable cutting insert provided by an embodiment of the present application;
[0029] Figure 7 is Figure 6 a cross-sectional view at A-A';
[0030] Figure 8 is Figure 6 a cross-sectional view at B-B';
[0031] Figure 9 is Figure 6 a cross-sectional view at C-C'.
[0032] Wherein, the blade body 100, the upper surface m1, the bottom surface m2, the side surface m3, the first direction f1, the cutting edge R, the circular arc cutting edge R1, the side cutting edge R2, the first side edge R21, the second side edge R22, the third side edge R23, the fourth side edge R24, the edge width surface k, the rake face d, the first rake face d1, the second rake face d2, the third rake face d3, the angle bisector z of the circular arc cutting edge, the chip breaking protrusion 101, the top surface 101a, the chip breaking side surface 101b, the arc convex surface 101c, the vertical plane P1, the first horizontal plane P2, the second horizontal plane P3.
[0033] The specific embodiments of the present application have been shown in the above drawings, and will be described in more detail hereinafter. These drawings and the written description are not intended to restrict the scope of the present application concept in any way, but to illustrate the present application concept to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION
[0034] In order to make the purpose, technical scheme and advantages of the present application more clear, the embodiments of the present application will be described in more detail below with reference to the drawings.
[0035] The technical scheme in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.
[0036] It should be understood that the "one embodiment" or "an embodiment" mentioned throughout the specification means that the specific features, structures or characteristics related to the embodiment are included in at least one embodiment of the present application. Therefore, "in one embodiment" or "in an embodiment" appearing throughout the specification does not necessarily mean the same embodiment. In addition, these specific features, structures or characteristics can be combined in one or more embodiments in any suitable manner.
[0037] Please refer to Figure 1 , Figure 2 ,Figure 3 and Figure 4 , Figure 1 is a structural schematic diagram of a indexable cutting insert provided by an embodiment of the present application, Figure 2 is Figure 1 is a local enlarged schematic view at A, Figure 3 is Figure 1 is a front view of the indexable cutting insert shown, Figure 4 is Figure 3 is a local enlarged schematic view at B. The indexable cutting insert can include an insert body 100, which can have an upper surface m1 and a bottom surface m2 oppositely arranged along a first direction f1, and a side surface m3 connecting the upper surface m1 and the bottom surface m2. The upper surface m1 of the insert body 100 can form a cutting edge R at an intersection with the side surface m3.
[0038] The cutting edge R in the insert body 100 can include a circular-arc cutting edge R1 at a nose location of the insert body 100 and two side cutting edges R2 arranged on both sides of the circular-arc cutting edge R1, the circular-arc cutting edge R1 can connect the corresponding two side cutting edges R2. Each side cutting edge R2 can include a first side edge R21, a second side edge R22, a third side edge R23 and a fourth side edge R24 arranged in sequence in a direction away from the circular-arc cutting edge R1. It should be noted that a plurality of nose locations can be formed at a plurality of top corners of the polygonal insert body 100. For example, the insert body 100 can be a quadrangular prism, the insert body 100 can have a group of upper surfaces m1 and bottom surfaces m2, the insert body 100 can have 4 top corners at the upper surface m1, corresponding to 4 cutting units respectively. A group of opposite corners among the four top corners can be acute angles, and the other group of opposite corners can be obtuse angles, for example, the angle of the acute angle can be 80 degrees. In other embodiments, the insert body 100 can be set as a triangular prism or a pentagonal prism according to actual production needs, having 3 or 5 top corners, and the specific shape of the insert body is not limited here, and can be adjusted according to actual conditions.
[0039] It should be further noted that the fourth side edges R24 in the two side cutting edges R2 distributed between every two adjacent circular-arc cutting edges R1 are connected to each other.
[0040] The upper surface m1 of the insert body 100 is provided with a chip-breaking protrusion 101 extending and distributed along an angle bisector z of the circular-arc cutting edge R1, and the height of the chip-breaking protrusion 101 gradually increases in a direction away from the circular-arc cutting edge R1.
[0041] In this design, the circular arc cutting edge R1 in the insert body 100 can be arranged parallel to the bottom surface m2, and the first side edge R21 can be tangent to and coplanar with the circular arc cutting edge R1. The second side edge R22 can be a straight edge, and the second side edge R22 can be inclined towards the bottom surface m2 of the insert body 100. The third side edge R23 in the insert body 100 can be a circular arc edge tangent to the second side edge R22, and the circular arc edge is curved towards the bottom surface m2. The fourth side edge R24 in the insert body 100 can be a straight edge tangent to the third side edge R23, and the fourth side edge R24 is parallel to the first side edge R21.
[0042] In this embodiment, multiple side edges that cooperate with the arc-shaped cutting edge R1 are provided in the side cutting edge R2 of the insert body 100, and a chip-breaking protrusion 101 is provided on the angle bisector of the arc-shaped cutting edge R1, thereby achieving a design linkage between the chip-breaking protrusion 101 and the multiple side edges. Thus, during machining with smaller parameters, especially when the depth of cut is less than the radius of the arc-shaped cutting edge R1, the chips flow from the arc-shaped cutting edge R1 to the chip-breaking protrusion 101, where they collide and curl and break. During machining with larger parameters, the linkage between the chip-breaking protrusion 101 and the multiple side edges, and the positive rake angle formed by the second side edge R22 and the third side edge R23 at their respective positions, helps maintain stability during cutting and reduces vibration and deviation. The height of some side edges in the side cutting edge R2 is lower than that of the arc-shaped cutting edge R1, making chip breaking and removal easier, reducing chip accumulation, thereby reducing cutting resistance and improving machining efficiency.
[0043] For example, such as Figure 4 As shown, the length L1 of the first side cutting edge R21 can range from 0.1 mm to 0.3 mm, for example, the length of the first side cutting edge R21 can be 0.1 mm, 0.15 mm, or 0.3 mm, etc. The length L2 of the second side cutting edge R22 in the blade body 100 can range from 0.3 mm to 0.8 mm, for example, the length of the second side cutting edge R22 can be 0.3 mm, 0.5 mm, or 0.8 mm, etc. The radius r1 of the arc of the third side cutting edge R23 in the blade body 100 can range from 4 mm to 8 mm, for example, the radius r1 of the arc of the third side cutting edge R23 can be 4 mm, 6 mm, or 8 mm, etc.
[0044] Optional, such as Figure 3As shown, the angle a between the side surface m3 in the insert body 100 and the vertical plane P1 (i.e. the insert relief angle) can range from 5 degrees to 11 degrees, and the vertical plane P1 can be a plane passing through the cutting edge R and parallel to the first direction f1. In this way, the strength of the cutting edge R can be ensured while avoiding unnecessary contact with the working surface being processed of the workpiece. For example, the angle a between the side surface m3 in the insert body 100 and the vertical plane P1 can be 5 degrees, 7 degrees, 11 degrees, etc.
[0045] In the embodiments of the present application, as shown in Figure 4 As shown, the height difference h1 of the fourth side edge R24 and the first side edge R21 in the insert body 100 along the first direction f1 can range from 0.05 mm to 0.15 mm. For example, the height difference h1 of the fourth side edge R24 and the first side edge R21 in the insert body 100 along the first direction f1 can be 0.05 mm, 0.1 mm, 0.15 mm, etc. In this way, within the height difference h1, the second side edge R22 and the third side edge R23 form a positive rake angle at the side edge position, which helps to maintain stability during cutting, reduces vibration and deviation. The height of part of the side cutting edge R2 is lower than that of the circular arc cutting edge R1, which can make cutting easier to discharge, reduce chip accumulation, thereby reducing cutting resistance and improving machining efficiency.
[0046] In the embodiments of the present application, as shown in Figure 4 As shown, the angle β between the second side edge R22 in the insert body 100 and the first horizontal plane P2 can range from 5 degrees to 10 degrees, and the first horizontal plane P2 can be parallel to the first side edge R21 and perpendicular to the first direction f1.
[0047] Optionally, please refer to Figure 5 and Figure 6 , Figure 5 is a partial structure diagram of a indexable cutting insert provided by the embodiments of the present application, Figure 6 is a top view of an indexable cutting insert provided by the embodiments of the present application. The upper surface m1 in the insert body 100 can have an edge width surface k connected with the cutting edge R, and a rake surface d distributed on the side of the edge width surface k away from the cutting edge R, and the rake surface d in the insert body 100 can be inclined towards the bottom surface m2 relative to the edge width surface k. Among them, the edge width surface k in the insert body 100 can be parallel to the bottom surface m2, and the width of the edge width surface k can range from 0.04 mm to 0.08 mm. In this way, the edge width surface k can be distributed around the entire circumference of the insert body 100, and within the width range, the sharpness of the insert body 100 under small cutting depth and small feed can be ensured, and the strength under large cutting depth and large feed can also be ensured.
[0048] In the embodiments of the present application, please refer to Figure 5 ,Figure 6 、 Figure 7 、 Figure 8 and Figure 9 , Figure 7 is Figure 6 a sectional view at A-A', Figure 8 is Figure 6 a sectional view at B-B', Figure 9 is Figure 6 a sectional view at C-C'. The rake face d in the insert body 100 can comprise a first rake face d1 arranged corresponding to the circular-arc cutting edge R1 in the insert body 100, and a second rake face d2 and a third rake face d3 arranged in sequence along the extension direction of the side cutting edge R2. The inclination angle δ1 of the first rake face d1 relative to the land face k towards the bottom face m2 is 10 degrees to 18 degrees, and the inclination angle δ2 of the third rake face d3 relative to the land face k towards the bottom face m2 is 5 degrees to 10 degrees. The second rake face d2 can comprise a circular-arc concave face d21 and a circular-arc convex face d22 connected to each other, one side of the circular-arc concave face d21 away from the circular-arc convex face d22 can be connected to the first rake face d1, and one side of the circular-arc convex face d22 away from the circular-arc concave face d21 can be connected to the third rake face d3. It should be noted that Figure 8 is cut down at a position 0.1 mm away from and parallel to the side cutting edge R2.
[0049] It should be noted that the inclination angle δ1 of the first rake face d1 is greater than the inclination angle δ2 of the third rake face d3, and when the second rake face d2 connects the first rake face d1 and the third rake face d3, the second rake face d2 has a downward trend from the circular-arc concave face d21 to the circular-arc convex face d22 away from the circular-arc cutting edge R1 and along the extension direction of the side cutting edge R2.
[0050] For example, the first rake face d1 can be a sector arc face, the curvature radius r2 of the circular-arc concave face d21 in the second rake face d2 can be in the range of 1 mm to 1.8 mm, for example, the curvature radius r2 of the circular-arc concave face d21 in the second rake face d2 can be 1 mm, 1.5 mm or 1.8 mm, etc. The curvature radius r3 of the circular-arc convex face d22 in the second rake face d2 can be in the range of 1.2 mm to 2.5 mm, for example, the curvature radius r3 of the circular-arc convex face d22 in the second rake face d2 can be 1.2 mm, 2 mm or 2.5 mm, etc.
[0051] Optionally, as Figure 5 、 Figure 6 and Figure 7As shown, the upper surface m1 of the insert body 100 is provided with a chip breaker protrusion 101 extending along the angle bisector z of the circular-arc cutting edge R1, which can be distributed on the side of the rake face d away from the land face k. The chip breaker protrusion 101 can have a top surface 101a located at the top of the chip breaker protrusion 101 and arranged in parallel with the bottom surface m2 of the insert body 100, and two chip breaker side surfaces 101b distributed on both sides of the top surface 101a and inclined towards the angle bisector of the circular-arc cutting edge R1. The two chip breaker side surfaces 101b are connected at one edge close to the circular-arc cutting edge R1 to form an arc convex surface 101c, and the distance between each chip breaker side surface 101b and the cutting edge R gradually increases in the direction from the circular-arc cutting edge R1 to the side cutting edge R2. In this way, in small-parameter cutting processing, especially when the cutting depth is less than the radius of the circular-arc cutting edge, the chip flows from the circular-arc cutting edge R1 to the arc convex surface 101c of the chip breaker protrusion 101 through the first rake face d1. Because the arc convex surface 101c has a certain length and height, the chip will collide at the corresponding position of the arc convex surface 101c with a certain inclination according to different cutting depths, feeds and materials, and the arc convex surface 101c provides a reaction force to the chip, so that the chip is curled and broken. In large-parameter cutting processing, especially when the cutting depth is greater than the radius of the circular-arc cutting edge R1, the chip flows along the circular-arc cutting edge R1 and the side cutting edge R2 through the first rake face d1, the second rake face d2 and the third rake face d3. Because the second rake face d2 has an upward trend in the direction from the circular-arc cutting edge R1 to the side cutting edge R2, the chip will receive a bending force upward when passing through the position of the second rake face d2. In addition, the distance between the side surface 101b of the chip breaker protrusion 101 and the cutting edge R gradually increases in the direction from the circular-arc cutting edge R1 to the side cutting edge R2, so that the chip will collide at the corresponding position of the chip breaker side surface and be curled and broken according to different cutting depths, feeds and materials, thereby realizing large cutting depth processing without chip jamming. Here, the side surface 101b of the chip breaker protrusion 101 can be an inclined plane.
[0052] As shown in the example, Figure 7 As shown, the angle β1 between the center line z1 of the arc convex surface 101c formed by the connection of the two side surfaces 101b at one edge close to the circular-arc cutting edge R1 and the second horizontal plane P3, which can be a plane parallel to the top surface 101a, can be in the range of 10 degrees to 15 degrees. For example, the angle β1 can be 10 degrees, 12 degrees or 15 degrees, etc.
[0053] In this application, the chip breaker protrusion 101 is a V-shaped protrusion, which is symmetrical about the angle bisector z of the arc cutting edge R1. The vertical distance h2 between the top surface 101a of the chip breaker protrusion 101 and the arc cutting edge R1 in the first direction f1 can be 0.1mm-0.3mm. For example, the vertical distance h2 between the top surface 101a of the chip breaker protrusion 101 and the arc cutting edge R1 in the first direction f1 can be 0.1mm, 0.15mm, or 0.3mm, etc. The minimum horizontal distance L3 between the top surface 101a of the chip breaker protrusion 101 and the arc cutting edge R1 can be 1mm-2mm. For example, the minimum horizontal distance L3 between the top surface 101a of the chip breaker protrusion 101 and the arc cutting edge R1 can be 1mm, 1.5mm, or 2mm, etc.
[0054] In summary, this application provides an indexable cutting insert, which may include an insert body 100. Multiple side edges that cooperate with a circular arc cutting edge R1 are provided in the side cutting edge R2 of the insert body 100, and a chip-breaking protrusion 101 is provided on the angle bisector of the circular arc cutting edge R1, thereby achieving a design linkage between the chip-breaking protrusion 101 and the multiple side edges. Thus, during low-parameter cutting, especially when the depth of cut is less than the radius of the circular arc cutting edge R1, the chips flow from the circular arc cutting edge R1 to the chip-breaking protrusion 101, where they contact and collide at the corresponding position, causing the chips to curl and break. During high-parameter cutting, the linkage between the chip-breaking protrusion 101 and the multiple side edges, and the positive rake angle formed by the second side edge R22 and the third side edge R23 at the side edge positions, helps maintain stability during cutting and reduces vibration and deviation. The height of part of the side cutting edge R2 is lower than that of the circular arc cutting edge R1, which makes it easier to break and remove chips, reduce chip accumulation, thereby reducing cutting resistance and improving machining efficiency.
[0055] This embodiment also provides a cutting tool, including: a tool body and an indexable turning insert, wherein the insert body 100 of the indexable turning insert is mounted on the tool body. In specific applications, the surface of the insert body 100 may be deposited with a functional or decorative coating, such as a titanium nitride coating, to improve the performance of the insert.
[0056] In this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The term "multiple" refers to two or more unless otherwise expressly defined.
[0057] The above description is merely an optional embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.
Claims
1. An indexable cutting insert, characterized by The utility model relates to a cutting insert, comprising: a blade body having an upper surface and a bottom surface oppositely arranged along a first direction, and a side surface connecting the upper surface and the bottom surface, the upper surface and the side surface intersecting to form a cutting edge; the cutting edge comprises a circular-arc cutting edge at a nose location and two side cutting edges arranged on both sides of the circular-arc cutting edge, the circular-arc cutting edge connecting the two side cutting edges, each side cutting edge comprising a first side edge, a second side edge, a third side edge and a fourth side edge arranged in sequence in a direction away from the circular-arc cutting edge; the upper surface is provided with a chip breaker protrusion extending along an angular bisector of the circular-arc cutting edge, and the height of the chip breaker protrusion gradually increases in a direction away from the circular-arc cutting edge; wherein the circular-arc cutting edge is parallel to the bottom surface, the first side edge is tangent to and coplanar with the circular-arc cutting edge; the second side edge is a straight edge and is inclined towards the bottom surface; the third side edge is a circular-arc edge tangent to the second side edge and curved towards the bottom surface; and the fourth side edge is a straight edge tangent to the third side edge and parallel to the first side edge.
2. The indexable cutting insert according to claim 1, characterized in that The included angle between the side surface and a vertical plane, which is a plane passing through the cutting edge and parallel to the first direction, ranges from 5 degrees to 11 degrees.
3. The indexable cutting insert according to claim 1, characterized in that The height difference between the fourth side edge and the first side edge in the first direction is 0.05 mm to 0.15 mm.
4. The indexable cutting insert according to claim 3, characterized in that The length of the first side edge ranges from 0.1 mm to 0.3 mm; the length of the second side edge ranges from 0.3 mm to 0.8 mm; and the radius of the circular-arc of the third side edge ranges from 4 mm to 8 mm.
5. The indexable cutting insert according to claim 3, wherein The included angle between the second side edge and a first horizontal plane, which is parallel to the first side edge and perpendicular to the first direction, ranges from 5 degrees to 10 degrees.
6. The indexable cutting insert according to any one of claims 1-5, characterized in that, The upper surface has a land surface abutting the cutting edge, and a rake surface distributed on a side of the land surface away from the cutting edge, the rake surface being inclined towards the bottom surface relative to the land surface; wherein the land surface is parallel to the bottom surface, and the width of the land surface ranges from 0.04 mm to 0.08 mm.
7. The indexable cutting insert according to claim 6, characterized in that The rake surface comprises a first rake surface corresponding to the circular-arc cutting edge, and a second rake surface and a third rake surface arranged in sequence in an extension direction of the side cutting edge; wherein the inclination angle of the first rake surface ranges from 10 degrees to 18 degrees; the inclination angle of the third rake surface ranges from 5 degrees to 10 degrees; and the second rake surface comprises a circular-arc concave surface and a circular-arc convex surface connected to each other, one side of the circular-arc concave surface away from the circular-arc convex surface being connected to the first rake surface, and one side of the circular-arc convex surface away from the circular-arc concave surface being connected to the third rake surface.
8. The indexable cutting insert according to claim 7, characterized in that The chip breaker protrusion is distributed on the flank surface of the rake face away from the land, and has a top surface at the top of the chip breaker protrusion and parallel to the bottom surface, and two chip breaker side surfaces distributed on both sides of the top surface, the two chip breaker side surfaces are both inclined towards the angle bisector of the circular-arc cutting edge, and the junction of the two chip breaker side surfaces near one side of the circular-arc cutting edge forms an arc-shaped convex surface, and the distance between the chip breaker side surface and the cutting edge gradually increases from the circular-arc cutting edge to the side cutting edge.
9. The indexable cutting insert according to claim 8, characterized in that The included angle between the center line of the arc-shaped convex surface and a second horizontal plane is in the range of 10 degrees to 15 degrees, and the second horizontal plane is a plane parallel to the top surface.
10. A cutting tool characterized by, Comprising: A tool body and an indexable cutting insert according to any one of claims 1 to 9, the insert body being mounted to the tool body.