Indexable turning tool blade

Abstract

The indexable turning tool blade is of a quadrangular frustum pyramid structure and comprises side faces, an upper end face and a lower end face, the upper end face and the lower end face are oppositely arranged, the periphery of the upper end face extends in the direction close to the side faces to form front tool faces, every two adjacent front tool faces are in radian transition through an auxiliary tool face, and each front tool face has a first gradient; a cutting edge is formed between the rake face and the side face and has a second gradient, a fastening screw hole is formed in the middle of the upper end face, the upper end face comprises a plane part and a slope part, a groove is formed in the plane part, the fastening screw hole penetrates through the groove, the groove wall of the groove is in slope transition from the plane part to the groove bottom of the groove, one side of the slope part is connected with the plane part, and the other side of the slope part is connected with the side face. A chip accommodating groove is formed between the slope part and the front cutter surface; and smooth bulges are protruded on the slope surface. The cutting efficiency and the chip breaking capacity can be effectively improved, and the chip removal difficulty is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of turning inserts, and in particular to an indexable turning insert. Background Art

[0002] High-temperature alloys are essential metal materials in modern aviation, aerospace, navigation and nuclear industries. In particular, the development of nickel-based high-temperature alloys has played an important role in improving the performance of my country's aviation engines. It has high strength, high hardness, good oxidation resistance, corrosion resistance, good fatigue performance, and comprehensive properties of fracture toughness. However, high-temperature alloys are typical difficult-to-process materials with poor cutting performance and low thermal conductivity. At the same time, the larger cutting force during cutting will cause the cutting temperature to be higher and the work hardening to be serious. When existing blades are used to cut high-temperature alloys, the difficulties are mainly reflected in the high cutting temperature, the difficulty of breaking chips, the difficulty of chip removal, the serious wear and damage of the blades, the low strength, and the short service life. These problems result in low production efficiency during high-temperature alloy processing, and it is difficult to ensure the processing accuracy and surface integrity of the workpiece. Summary of the invention

[0003] The technical problem to be solved by the present invention is that the cutting efficiency of the turning insert in the prior art is low and the chip breaking and chip removal are difficult during the cutting process.

[0004] In order to solve the problems existing in the prior art, an indexable turning insert for semi-finishing machining of a high-temperature alloy is disclosed. The indexable turning insert for semi-finishing machining of a high-temperature alloy is a quadrangular pyramid structure, including a pyramid side surface and an upper end surface and a lower end surface arranged oppositely. A rake face is extended around the upper end surface in a direction close to the pyramid side surface, and an auxiliary blade curvature transition is made between two adjacent rake faces. The rake face has a first slope, and a cutting edge is formed between the rake face and the pyramid side surface. The cutting edge has a second slope, and the direction of the second slope is opposite to the direction of the first slope.

[0005] A fastening screw hole is provided in the middle of the upper end surface, and the upper end surface includes a plane portion and a slope portion. The plane portion is provided with a groove, and the fastening screw hole passes through the groove. The groove wall of the groove slopes from the plane portion to the groove bottom of the groove. One side of the slope portion is connected to the plane portion, and the other side of the slope portion is connected to the front cutting edge. The slope portion has a third slope, and the direction of the third slope is opposite to the direction of the first slope. A chip groove is formed between the slope portion and the front cutting edge; a smooth protrusion protrudes from the slope surface.

[0006] In some embodiments, a side of the first slope close to the upper end surface is a slope starting bottom edge, and the slope starting bottom edge is lower than a connecting edge between the rake surface and the side surface.

[0007] In some embodiments, the rake angle α of the rake face is 9° to 11°, the clearance angle β of the rake face is 6° to 8°, and the rake angle γ of the cutting edge is 0°.

[0008] In some embodiments, a peach-shaped protrusion is also protruding from the upper end surface, and the peach-shaped protrusion transitions from the planar portion to the slope portion. The center of the peach-shaped protrusion is located at the slope portion, and the center is opposite to the auxiliary blade surface. The peach-shaped side surface of the peach-shaped protrusion is set with a slope, and an obtuse angle is formed between the peach-shaped side surface and the slope portion.

[0009] In some embodiments, the groove is a polygonal structure.

[0010] In some embodiments, a transition groove and a strip-shaped protrusion are also provided on the upper end surface, one end of the transition groove is connected to the groove, the other end of the transition groove is connected to the strip-shaped protrusion, and the other end of the strip-shaped protrusion extends toward the front cutting edge.

[0011] In some embodiments, the strip-shaped protrusion and the peach-shaped protrusion are both arranged around the central circumference of the indexable turning insert, and the strip-shaped protrusion and the peach-shaped protrusion are arranged adjacent to each other in sequence.

[0012] In some embodiments, the strip-shaped protrusion is arranged perpendicular to the cutting edge.

[0013] In some embodiments, a heat dissipation structure is provided on the lower end surface.

[0014] In some embodiments, the thickness of the indexable turning insert is 8 mm to 12 mm, wherein the thickness is the distance between AB.

[0015] The present invention includes but is not limited to the following beneficial effects: (1) By providing a rounded protrusion on the upper end surface, when the chips flow onto the rounded protrusion, the flow of the chips is hindered and changed in direction due to the presence of the rounded protrusion. Such obstruction and change of direction make the chips more easily broken, and the rounded protrusion can effectively improve the chip removal capacity of the blade; further, by designing a chip groove between the slope portion and the front cutting edge, both sides of the chip groove are designed with a slope, thereby improving the chip removal capacity of the blade during the cutting process, and the design of the chip groove can increase the heat dissipation surface, improve the chip holding capacity, and facilitate the inflow of cutting fluid, take away heat, and reduce temperature; (2) By providing a peach-shaped protrusion and making the peach-shaped protrusion located at the corner of the prism, the present invention increases the strength of the blade, improves the impact resistance of the blade, and increases the service life of the blade. Furthermore, the side surface of the peach-shaped protrusion is designed with a slope, and the slope design of the peach-shaped protrusion is conducive to the breaking and removal of chips. Control the flow of chips. When the chips flow onto the slope, due to the inclination angle and shape of the slope, the chips will be subjected to a downward force component, which helps to break the chips. At the same time, the design of the slope can also guide the chips to flow in a certain direction to avoid the accumulation and blockage of chips on the blade. The slope design of the peach-shaped protrusion can not only improve the chip cutting ability of the blade, but also improve the chip discharge effect; (3) The present invention increases the blade strength and improves the processing life by setting the strip protrusion; effectively limits the tool-chip contact length, reduces the friction of the tool-chip contact surface, and is beneficial to reducing the cutting temperature; (4) The present invention sets a cutting edge with a second slope, which can strengthen the cutting edge, make cutting more stable, and reduce cutting vibration, thereby improving the impact resistance of the blade; (5) The present invention sets a heat dissipation structure on the lower end face, which is beneficial to the inflow of cutting fluid and taking away heat, promotes blade cooling, and enables the blade to maintain good cutting performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below.

[0017] Figure 1 is a schematic structural diagram of an indexable turning insert according to an embodiment of the present invention;

[0018] Figure 2 is a schematic plan view of an indexable turning insert according to an embodiment of the present invention at an angle;

[0019] Figure 3 is a plan view of the indexable turning insert according to another embodiment of the present invention at another angle;

[0020] Figure 4 is a plan view of the indexable turning insert according to another embodiment of the present invention at another angle;

[0021] Figure 5 yes Figure 2 Sectional view along line AA;

[0022] Figure 6 yes Figure 5 The enlarged view of point I in the middle;

[0023] Figure 7 yes Figure 4 Sectional view along line BB;

[0024] Figure 8 This is the simulation diagram of strain results when the stress area is the cutting edge;

[0025] Fig. 9 This is a simulation diagram of the deformation results when the force-bearing area is the cutting edge;

[0026] Fig.10 This is the simulation diagram of strain results when peach-shaped structure and strip-shaped structure exist;

[0027] Fig.11 This is a simulation diagram of deformation results when peach-shaped structure and strip structure exist;

[0028] Fig.12 This is a simulation diagram of strain results when there is no peach-shaped structure or strip structure;

[0029] Fig.13 This is a simulation diagram of the deformation result when there is no peach-shaped structure and strip structure;

[0030] In the figure, 1-upper end face, 11-plane part, 12-slope part, 13-groove, 131-groove wall, 132-groove bottom, 14-slope starting bottom edge, 15-connecting edge, 16-smooth protrusion, 17-peach-shaped protrusion, 18-strip-shaped protrusion, 19-transition groove, 2-lower end face, 3-prism side, 4-front blade face, 5-cutting edge, 6-auxiliary blade face, 7-fastening screw hole, 8-chip groove, 9-heat dissipation structure, 91-disc part, 92-side wing part, 93-heat dissipation groove. DETAILED DESCRIPTION

[0031] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0032] The term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure or characteristic that may be included in at least one implementation of the present invention. In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "inner", "lower", etc. is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are used only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may include one or more of the features explicitly or implicitly. Moreover, the terms "first", "second", etc. are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein.

[0033] In order to solve the problems existing in the prior art, the present invention discloses an indexable turning blade, which is mainly used in the field of high-temperature alloy processing, especially the semi-finishing of high-temperature alloys. Among them, the high-temperature alloy can be but not limited to GH901 nickel-based high-temperature alloy, the turning blade can be but not limited to YT15 cemented carbide square indexable turning blade, the cutting speed can be 40m / min, the feed rate can be 0.18mm / r, the cutting depth can be 0.5mm, and the cutting force range can be 400N~600N (the main cutting force selected in the simulation is 500N). The yield strength of the indexable turning blade can be 4GPa, the elastic modulus can be 650GPa, the thermal conductivity can be 72W / mK, the Poisson's ratio can be 0.23, the linear expansion coefficient can be 6.5×10-6 / ℃, the bending strength can be 1180MPa, and the material density can be 11.1~11.6g / cm^3.

[0034] For details, see Figures 1 to 7 As shown, the indexable turning insert for semi-finishing machining of high-temperature alloys is a quadrangular pyramid structure, the indexable turning insert comprises a pyramid side surface 3 and an upper end surface 1 and a lower end surface 2 arranged oppositely, the upper end surface 1 has a rake face 4 extending around the periphery in the direction close to the pyramid side surface 3, the two adjacent rake faces 4 are transitioned by an auxiliary blade face 6, the rake face 4 has a first slope, a cutting edge 5 is formed between the rake face 4 and the pyramid side surface 3, the cutting edge 5 has a second slope, and the direction of the second slope is opposite to the direction of the first slope; continue to refer to Figure 1As shown, in the embodiment of the present application, the circumference of the lower end face 2 is smaller than the circumference of the upper end face 1. The auxiliary blade face 6 is a fan-shaped structure, located at the corner of the upper end face 1. In this example, the side of the first slope close to the upper end face 1 is the slope starting bottom edge 14, and the slope starting bottom edge 14 is lower than the connecting edge 15 between the front blade 4 and the side surface. Further, the connecting edge 15 serves as the top starting edge of the second slope, and the connecting edge between the cutting edge 5 and the prism side 3 serves as the bottom terminating edge of the second slope. It can be seen from the figure that the bottom terminating edge is lower than the top starting edge. It can be understood that by providing a cutting edge 5 with a second slope, the cutting edge 5 can be strengthened to make cutting smoother, while reducing cutting vibration and improving the impact resistance of the blade.

[0035] Furthermore, a fastening screw hole 7 is opened in the middle of the upper end surface 1. Specifically, the fastening screw hole 7 is used to install and fix the blade. The blade is fixed to the tool holder by passing the fastening screw through the fastening screw hole 7 to ensure that the blade will not loosen or fall off during the chip cutting process. At the same time, the design of the fastening screw hole 7 also takes the removal of cutting chips into consideration. The design of the through groove 13 helps to discharge cutting chips from the hole to avoid chip accumulation affecting the performance of the blade. Furthermore, the upper end surface 1 includes a plane portion 11 and a slope portion 12. A groove 13 is provided on the plane portion 11. The fastening screw hole 7 passes through the groove 13. The groove wall 131 of the groove 13 slopes from the plane portion 11 to the groove bottom 132 of the groove 13. One side of the slope portion 12 is connected to the plane portion 11, and the other side of the slope portion 12 is connected to the front cutting edge 4. The slope portion 12 has a third slope, and the direction of the third slope is opposite to the direction of the first slope. A chip groove 8 is formed between the slope portion 12 and the front cutting edge 4; a smooth protrusion 16 protrudes from the slope surface. In one example, the smooth protrusion 16 can be a hemispherical shape, or a spherical structure of other sizes greater than 1 / 2 sphere. By arranging the smooth protrusion 16 on the upper end face 1, when the chips flow onto the smooth protrusion 16, the flow of the chips is hindered and the direction is changed due to the presence of the smooth protrusion. Such hindering and changing the direction make the chips easier to be broken, and the smooth protrusion can effectively improve the chip removal capacity of the blade; further, by designing a chip groove 8 to be formed between the slope portion 12 and the rake face 4, both sides of the chip groove 8 are designed with a slope, thereby improving the chip removal capacity of the blade during the cutting process, and the design of the chip groove 8 can increase the heat dissipation surface, improve the chip holding capacity, and facilitate the inflow of cutting fluid, take away heat, and reduce the temperature;

[0036] In some embodiments, Figure 5 and Figure 7In the XY coordinate system, the front angle of the front cutting edge 4 is represented by the letter α, the back angle of the front cutting edge 4 is represented by the letter β, and the cutting edge inclination angle of the cutting edge 5 is represented by the letter γ. In one embodiment, the front angle α of the front cutting edge 4 is 9° to 11°, the back angle β of the front cutting edge 4 is 6° to 8°, and the cutting edge inclination angle γ of the cutting edge 5 is 0°. It can be understood that the design of the front angle is conducive to the curling of large chips, and the design of the back angle can reduce the degree of friction between the back face of the indexable turning insert and the machined surface of the workpiece being cut, reduce the wear of the back face of the indexable turning insert, and improve the durability of the indexable turning insert.

[0037] It can be understood that there are 4 front cutting surfaces, and the 4 front cutting surfaces correspond to four cutting edges. When a point is selected on the cutting edge, the surface passing through this point and parallel to the bottom surface is the base surface, and the surface passing through this point and perpendicular to the base surface is the cutting plane. This point is called the cutting edge selection point. The reason for selecting a point is that by selecting a point, we can simplify complex problems or phenomena and focus on this point for in-depth analysis. Furthermore, the blade inclination angle is the angle between the main cutting edge and the base surface made by the cutting tip, which is zero degrees. The advantages of zero degrees are small cutting force, easy chip removal, and smooth processing.

[0038] It should be noted that the design of the rake angle is crucial to chip formation and discharge during the cutting process. A larger rake angle can reduce the contact area between the cutting edge and the workpiece, thereby reducing the cutting force and cutting temperature, but an excessively large rake angle will reduce the cutting edge strength and make it easy to wear or break. A smaller rake angle can enhance the strength of the cutting edge, but the cutting force and cutting temperature will be relatively high. Therefore, an appropriate rake angle helps to curl and break the chips, reduce the risk of chip entanglement and blockage, and selecting a rake angle range of 9° to 11° is to optimize cutting performance and chip control while ensuring the strength of the cutting edge. Specifically, a smaller contact area helps to reduce cutting force and make the cutting process smoother.

[0039] Furthermore, the design of the back angle is intended to reduce the friction between the back face of the tool and the workpiece processing surface, thereby reducing the back face wear and improving the tool durability. A larger back angle can reduce friction, but it will also reduce the strength of the cutting edge. A smaller back angle can enhance the strength of the cutting edge, but it will increase friction and wear. Therefore, an appropriate back angle helps to reduce friction and extend the life of the blade. Selecting a back angle of 6° to 8° can extend the life of the blade while improving the quality of the processed surface.

[0040] Furthermore, the design of the rake angle mainly affects the cutting direction of the cutting edge and the distribution of cutting force. A rake angle of 0° means that the cutting edge is perpendicular to the cutting direction, which can ensure uniform distribution of cutting force, reduce vibration and instability during the cutting process, and improve the uniformity of cutting force distribution on the cutting edge, reduce local overload and wear, and further, a stable cutting process helps to obtain higher machining accuracy and surface quality.

[0041] In some embodiments, a peach-shaped protrusion 17 is further protruded from the upper end surface 1, and the peach-shaped protrusion 17 transitions from the plane portion 11 to the slope portion 12. The center of the peach-shaped protrusion 17 is located at the slope portion 12, and the center is opposite to the auxiliary blade surface 6. The peach-shaped side surface of the peach-shaped protrusion 17 is set as a slope, and an obtuse angle is formed between the peach-shaped side surface and the slope portion 12. In this example, there are four peach-shaped protrusions 17, which are respectively arranged at the four corners of the upper end surface 1. By providing the peach-shaped protrusion 17 and locating the peach-shaped protrusion 17 at the corner of the prism, not only the strength of the blade can be increased, but also the impact resistance of the blade can be improved, and the service life of the blade can be increased. Furthermore, the peach-shaped side surface is set as a slope. The slope design of the peach-shaped protrusion helps to break the chips and control the flow of the chips. When the chips flow onto the slope, due to the inclination angle and shape of the slope, the chips will be subjected to a downward component force, which helps to break the chips. At the same time, the slope design can also guide the chips to flow in a certain direction to avoid the accumulation and clogging of chips on the blade. The slope design of the peach-shaped protrusion can not only improve the chip cutting ability of the blade, but also improve the chip discharge effect.

[0042] In some embodiments, the groove 13 is a polygonal structure. Further, a transition groove 19 and a strip protrusion 18 are also provided on the upper end face 1, one end of the transition groove 19 is connected to the groove 13, the other end of the transition groove 19 is connected to the strip protrusion 18, and the other end of the strip protrusion 18 extends to the rake face 4. By providing the strip protrusion 18, the blade strength is increased and the processing life is improved; the tool-chip contact length is effectively limited, the friction of the tool-chip contact surface is reduced, and it is beneficial to reduce the cutting temperature. It can be understood that the groove 13 is mainly used to accommodate and fix the fastening screw, and the slope transition of the groove wall is conducive to the flow and discharge of the cutting chips. The transition groove 19 plays the role of connecting the groove 13 and the strip protrusion 18, making the structure more smoothly transitioned and avoiding stress concentration. In the absence of the transition groove 19, although the strip protrusion 18 can be directly connected to the groove 13, such a design may cause a sudden change in the structure, increase the risk of stress concentration, and is also not conducive to the smooth flow of cutting chips. The provision of the transition groove 19 makes the structure of the entire upper end face more reasonable, which helps to improve the overall performance of the blade.

[0043] In some embodiments, the strip-shaped protrusion 18 and the peach-shaped protrusion 17 are both arranged around the central circumference of the indexable turning insert, and the strip-shaped protrusion 18 and the peach-shaped protrusion 17 are arranged adjacent to each other in sequence.

[0044] In some embodiments, the strip protrusion 18 is arranged perpendicular to the cutting edge 5. By arranging the strip protrusion 18 perpendicular to the cutting edge 5, the overall strength of the blade during the cutting process is significantly increased, and the flow path of the chips is effectively restricted, so that the chips are more easily controlled and guided into the chip groove. It helps to increase the heat dissipation area on the blade surface. It helps to maintain the stability of the cutting edge 5 during the cutting process and reduce the processing error caused by tool vibration or deformation. It limits the contact length of the tool and the chip, and reduces the friction of the tool and the chip contact surface. It gives the blade a unique and orderly appearance. The appearance of the entire blade is made more unified and coordinated, the manufacturing process is simpler, and the structure is stable.

[0045] In some embodiments, continue to refer to Figure 6 As shown, a heat dissipation structure 9 is provided on the lower end surface 2. In one example, the heat dissipation structure 9 is a disc-shaped structure with side wings, including a disc portion 91 and a side wing portion 92, wherein a plurality of heat dissipation grooves 93 are provided in an annular shape on the disc portion 91, and the side wing portion 92 is a concave structure, and the area formed around the heat dissipation grooves 93 constitutes the support surface 10 of the indexable turning insert.

[0046] In some embodiments, the thickness of the indexable turning insert is 8 mm to 12 mm, wherein the thickness is the distance between AB.

[0047] In one example, the present application simulates the cutting force as 500N and the force area as the cutting edge, and the simulation results include: Figure 8 The strain results shown in the figure and Fig. 9 As shown in the deformation result diagram, it can be seen that the maximum stress of the blade is 174.9MPa, the maximum strain is 0.00047, and the maximum deformation is 0.00024127mm. The blade meets the actual processing conditions.

[0048] Furthermore, in order to further explain the effect of peach-shaped structure and strip-shaped structure on stress and strain, the force of cutting was 500N, and the force area was the total area of ​​peach-shaped area and strip-shaped area. The results are as follows: Fig.10 The strain analysis diagram shown and Fig.11 The deformation analysis diagram shown in the figure shows that the heart part is subjected to stress. The stress in actual processing is simulated and the result shows that the maximum stress is 23.784MP and the maximum strain is 4.0333×10 -5 , the maximum deformation is 5.0618×10 -5mm, further, in order to prove the improvement of the peach-shaped structure and the strip structure on stress and strain, further simulation was performed after removing the peach-shaped structure and the strip structure, and the obtained Fig.12 The strain analysis diagram shown and Fig.13 As shown in the deformation analysis diagram, it can be seen that after removing the heart-shaped structure and the strip-shaped structure, the maximum stress is 179.21MP, the maximum strain is 0.0004643, and the deformation is 0.00024266mm. By comparing the stress of the cutting edge with the heart-shaped part, it can be seen that after adding the heart-shaped part and the strip-shaped raised part, the stress and deformation are smaller, indicating that the structure can improve the blade's ability to resist stress and deformation.

[0049] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

[0050] The above shows and describes the basic principle, connection mode, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements fall within the scope of the present invention to be protected.

Claims

1. An indexable turning insert, characterized in that: The indexable turning insert is a quadrangular pyramid structure, comprising a pyramid side surface (3) and an upper end surface (1) and a lower end surface (2) arranged opposite to each other; a rake face (4) is extended around the upper end surface (1) in a direction close to the pyramid side surface (3); an auxiliary blade face (6) is used to transition the arc between two adjacent rake faces (4); the rake face (4) has a first slope; a cutting edge (5) is formed between the rake face (4) and the pyramid side surface (3); the cutting edge (5) has a second slope, and the direction of the second slope is opposite to the direction of the first slope; A fastening screw hole (7) is provided in the middle of the upper end surface (1), and the upper end surface (1) comprises a plane portion (11) and a slope portion (12). A groove (13) is provided on the plane portion (11), and the fastening screw hole (7) passes through the groove (13). The groove wall (131) of the groove (13) slopes from the plane portion (11) to the groove bottom (132) of the groove (13). One side of the slope portion (12) is connected to the plane portion (11), and the other side of the slope portion (12) is connected to the front cutting edge (4). The slope portion (12) has a third slope, and the direction of the third slope is opposite to the direction of the first slope. A chip groove (8) is formed between the slope portion (12) and the front cutting edge (4); and a smooth protrusion (16) protrudes from the slope surface.

2. The indexable turning insert according to claim 1, characterized in that: The side of the first slope close to the upper end surface (1) is a slope starting bottom edge (14), and the slope starting bottom edge (14) is lower than the connecting edge (15) between the rake face (4) and the side surface.

3. The indexable turning insert according to claim 1, characterized in that: The front angle α of the front cutting face (4) is 9° to 11°, the back angle β of the front cutting face (4) is 6° to 8°, and the rake angle γ of the cutting edge (5) is 0°.

4. The indexable turning insert according to claim 1, characterized in that: A peach-shaped protrusion (17) is also protruded from the upper end surface (1), and the peach-shaped protrusion (17) transitions from the plane portion (11) to the slope portion (12). The center of the peach-shaped protrusion (17) is located at the slope portion (12), and the center is opposite to the auxiliary blade surface (6). The peach-shaped side surface of the peach-shaped protrusion (17) is set as a slope, and an obtuse angle is formed between the peach-shaped side surface and the slope portion (12).

5. The indexable turning insert according to claim 4, characterized in that: The groove (13) is a polygonal structure.

6. The indexable turning insert according to claim 5, characterized in that: A transition groove (19) and a strip-shaped protrusion (18) are also provided on the upper end surface (1); one end of the transition groove (19) is connected to the groove (13); the other end of the transition groove (19) is connected to the strip-shaped protrusion (18); and the other end of the strip-shaped protrusion (18) extends toward the front cutting edge (4).

7. The indexable turning insert according to claim 6, characterized in that: The strip-shaped protrusion (18) and the peach-shaped protrusion (17) are both arranged around the central circumference of the indexable turning insert, and the strip-shaped protrusion (18) and the peach-shaped protrusion (17) are arranged adjacent to each other in sequence.

8. The indexable turning insert according to claim 7, characterized in that: The strip-shaped protrusion (18) is arranged perpendicularly to the cutting edge (5).

9. The indexable turning insert according to claim 1, characterized in that: A heat dissipation structure (9) is provided on the lower end surface (2).

10. The indexable turning insert according to claim 1, characterized in that: The thickness of the indexable turning insert is 8 mm to 12 mm, wherein the thickness is the distance between AB.

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