Milling tool and milling insert thereof

Abstract

The utility model provides a milling tool and a milling blade thereof. A front tool face of the milling blade comprises a main front tool face, an auxiliary front tool face and an angle front tool face, a rear tool face comprises a main rear tool face, an auxiliary rear tool face and an angle rear tool face, a main cutting edge is formed at the intersection of the main front tool face and the main rear tool face, an auxiliary cutting edge is formed at the intersection of the auxiliary front tool face and the auxiliary rear tool face, and an angle edge is formed at the intersection of the angle front tool face and the angle rear tool face. The angle rake face comprises a first rake face and a second rake face, one side of the first rake face is connected with the angle edge, the other side of the first rake face is in transition connection with the second rake face, the rake angle of the first rake face is a first rake angle, the rake angle of the second rake face is a second rake angle, and the first rake angle is smaller than the second rake angle. The corner edges of the milling blade and the milling tool are high in strength, and the problem that the corner edges are prone to breakage during high-feed machining can be solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to mechanical processing equipment field, especially a kind of milling cutter and its milling blade. BACKGROUND

[0002] When manufacturing mechanical parts, milling blade is needed to be used to mill plane, contour milling, groove milling and other processes on various steels to obtain the required size and accuracy. During the process of steel manufacturing, a large amount of processed steel needs to be quickly removed to shorten the processing time and improve the production efficiency, and high-feed processing milling blade needs to be used.

[0003] For high-feed processing milling blade, the strength of its cutting edge needs to be strong to ensure its high milling capacity. Since the milling blade is installed on the tool holder, the corner edge of the milling blade is easy to be damaged when it first contacts the workpiece during milling, which affects the normal work of the milling blade. SUMMARY

[0004] One object of the present utility model is to provide a milling blade with a corner edge part having high strength.

[0005] To solve the above technical problems, the present utility model adopts the following technical solutions:

[0006] A milling blade comprises: oppositely arranged upper and lower surfaces in polygonal shape, and a peripheral side surface connected between the upper and lower surfaces, wherein the intersection of the peripheral side surface and the upper surface forms a cutting edge, the cutting edge comprises a corner edge located at the apex of the polygon, and a main cutting edge and a secondary cutting edge located between two adjacent corner edges, the upper surface is provided with a rake surface along the cutting edge, and the peripheral side surface is provided with a relief surface along the cutting edge.

[0007] The rake surface comprises a main rake surface, a secondary rake surface and a corner rake surface, the relief surface comprises a main relief surface, a secondary relief surface and a corner relief surface, the intersection of the main rake surface and the main relief surface forms the main cutting edge, the intersection of the secondary rake surface and the secondary relief surface forms the secondary cutting edge, and the intersection of the corner rake surface and the corner relief surface forms the corner edge.

[0008] The corner rake surface comprises a first rake surface and a second rake surface, one side of the first rake surface is connected with the corner edge, the other side of the first rake surface is transitionally connected with the second rake surface, the rake angle of the first rake surface is a first rake angle, and the rake angle of the second rake surface is a second rake angle, wherein the first rake angle is smaller than the second rake angle.

[0009] In one embodiment, the rake angle of the primary rake surface is a primary rake angle, the rake angle of the secondary rake surface is a secondary rake angle, and the primary rake angle and the secondary rake angle are both greater than the first rake angle.

[0010] In one embodiment, the first rake angle ranges from 10° to 15°.

[0011] In one embodiment, the first rake angle gradually decreases from the two ends of the first rake surface to the middle.

[0012] In one embodiment, the upper surface is provided with a first connecting portion and a second connecting portion, when viewed from the upper surface, one end of the first rake surface is connected to the secondary cutting edge through the first connecting portion, the other end of the first rake surface is connected to the primary cutting edge through the second connecting portion, the width of the first connecting portion gradually decreases from the first rake surface towards the secondary rake surface and extends to the secondary cutting edge, and the width of the second connecting portion gradually decreases from the first rake surface towards the primary rake surface and extends to the primary cutting edge.

[0013] The upper surface is also provided with a third connecting portion and a fourth connecting portion, when viewed from the upper surface, one end of the second rake surface is connected to the secondary rake surface through the third connecting portion, the other end of the second rake surface is connected to the primary rake surface through the fourth connecting portion, the width of the second rake surface gradually increases from one end close to the fourth connecting portion to the other end, the width of the third connecting portion gradually increases from the second rake surface towards the secondary rake surface, and the width of the fourth connecting portion gradually increases from the second rake surface towards the primary rake surface.

[0014] In one embodiment, the milling insert is provided with a central hole passing through the upper surface and the lower surface, and in the direction from the upper surface to the lower surface, the primary clearance surface is inclined away from the central hole, and the secondary clearance surface is inclined towards the central hole.

[0015] In one embodiment, when viewed from the primary clearance surface and the secondary clearance surface, the secondary cutting edge is in a straight line shape, the primary cutting edge is in a curved shape protruding upwards, and the primary cutting edge and the secondary cutting edge are smoothly connected.

[0016] A milling tool includes a tool holder and a milling insert mounted on the tool holder, the front end of the tool holder is provided with a mounting groove for mounting the milling insert, and in the side view of the tool holder, the bottom surface of the mounting groove gradually inclines away from the direction close to the axial center line of the tool holder in the direction from the front end of the tool holder to the rear end of the tool holder, that is, the axial rake angle of the bottom surface of the mounting groove is negative.

[0017] In one embodiment, the outermost point of the corner blade is the vertex, the line connecting the central axis of the handle and the vertex is the reference line, and the angle between the first rake face and the reference line is negative.

[0018] In one embodiment, in a top view of the handle, the cutting angle of the main cutting edge of the blade is 10° to 20°.

[0019] As can be seen from the above technical solution, this utility model has at least the following advantages and positive effects:

[0020] This invention relates to a milling cutter and its insert, which improves the strength of the corner cutting edge by setting the corner cutting edge to have two different angles: a first rake face and a second rake face. Furthermore, the bottom surface of the mounting groove on the cutter shank is set with a negative axial rake angle, so that after the insert is installed, the actual cutting rake angle of the first rake face becomes negative, increasing the included angle at the insert's entry point, enhancing the strength of the corner cutting edge, and improving its resistance to chipping. This solves the problem of corner cutting edge chipping during high-feed machining. Attached Figure Description

[0021] Figure 1 This is a perspective view of the milling insert of this embodiment;

[0022] Figure 2 yes Figure 1 The front view of the milling insert shown;

[0023] Figure 3 yes Figure 1 A top view of the milling insert shown;

[0024] Figure 4 yes Figure 3 The milling insert shown is a cross-sectional view along CC.

[0025] Figure 5 yes Figure 3 The milling insert shown is a cross-sectional view along DD;

[0026] Figure 6 yes Figure 3 The milling insert shown is a cross-sectional view along BB;

[0027] Figure 7 yes Figure 3 The milling insert shown is a cross-sectional view along AA;

[0028] Figure 8 This is a top view of the milling tool in this embodiment;

[0029] Figure 9 yes Figure 8 Side view of the milling cutter shown;

[0030] Figure 10 yes Figure 8 The side view shown is of the milling cutter without the milling insert installed.

[0031] Figure 11 yes Figure 8 The milling cutter shown is in cross-sectional view along EE;

[0032] Figure 12 yes Figure 11 A magnified view of part M shown.

[0033] The annotations in the attached figures are explained as follows:

[0034] 10. Milling insert; 101. Center hole; 11. Upper surface; 111. Primary rake face; 1111. First primary rake face; 1121. Second secondary rake face; 112. Secondary rake face; 113. Angular rake face; 114. First rake face; 115. Second rake face; 116. First connecting part; 117. Second connecting part; 118. Third connecting part; 119. Fourth connecting part;

[0035] 12. Lower surface;

[0036] 13. Peripheral side face; 131. Main flank face; 132. Secondary flank face; 133. Corner flank face;

[0037] 14. Corner blade; 141. First corner blade; 142. Second corner blade; 143. Third corner blade;

[0038] 15. Primary cutting edge; 151. First primary cutting edge; 152. Second primary cutting edge;

[0039] 16. Secondary cutting edge; 161. First secondary cutting edge; 162. Secondary cutting edge;

[0040] 1. Milling cutter; 20. Tool holder; 21. Mounting slot; 22. Mounting hole;

[0041] a1, primary anterior angle; a2, secondary anterior angle; b1, b1', first anterior angle; b2, second anterior angle; c1, c2, angle of entry; d, axial anterior angle. Detailed Implementation

[0042] Typical embodiments embodying the features and advantages of this utility model will be described in detail in the following description. It should be understood that this utility model can have various variations in different embodiments, all of which do not depart from the scope of this utility model, and the descriptions and illustrations therein are for illustrative purposes only and not intended to limit this utility model.

[0043] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0044] This application provides a milling tool and its milling insert. A milling tool includes a tool holder and a milling insert mounted on the tool holder.

[0045] Please see Figure 1 and Figure 2 This embodiment provides a milling insert 10. The milling insert 10 includes an upper surface 11 and a lower surface 12 that are oppositely arranged and polygonal. The milling insert 10 also includes a peripheral side surface 13 connecting the upper surface 11 and the lower surface 12. The upper surface 11 and the lower surface 12 of the milling insert 10 have a polygonal structure. Specifically, in this embodiment, the polygon is approximately triangular and has three vertices. A central hole 101 is provided in the middle of the milling insert 10, which passes through the upper surface 11 and the lower surface 12. The central hole 101 serves as a key connection part for securely installing and fixing with the tool holder 20, ensuring a tight fit between the milling insert 10 and the tool holder, and preventing safety hazards such as loosening of the milling insert 10 during high-speed rotation.

[0046] The cutting edge is formed at the intersection of the peripheral side 13 and the upper surface 11. The cutting edge includes a corner cutting edge 14 located at the apex and a main cutting edge 15 and a secondary cutting edge 16 located between two adjacent corner cutting edges 14. The main cutting edge 15 and the secondary cutting edge 16 are smoothly connected. This smooth connection design makes the cutting process smoother and more continuous, reduces the surface roughness of the machined workpiece, and improves the machining accuracy.

[0047] Milling inserts 10 are typically made of high-performance materials such as superhard alloys and cermets. Superhard alloys have extremely high hardness and wear resistance, and can withstand high-intensity cutting forces, extending the service life of the inserts. Cermets combine the high hardness of ceramics with the toughness of metals, making the inserts sharp and not easy to break, adapting to a variety of complex working conditions.

[0048] Please see Figure 3 The upper surface 11 extends along the cutting edge and is provided with a rake face (not shown in the figure). The rake face includes a main rake face 111, a secondary rake face 112, and an angular rake face 113. The main rake face 111 and the secondary rake face 112 are smoothly connected and work together. The main rake face 111, the secondary rake face 112, and the angular rake face 113 are used to separate the workpiece material.

[0049] Please see Figure 4 and Figure 5 The rake angle of the primary rake face 111 is the primary rake angle a1, and the rake angle of the secondary rake face 112 is the secondary rake angle a2. Both the primary rake angle a1 of the primary rake face 111 and the secondary rake angle a2 of the secondary rake face 112 are relatively large, making the primary cutting edge 15 and the secondary cutting edge 16 quite sharp, thus effectively ensuring the cutting performance of the insert. Specifically, the size of the primary rake angle a1 and the secondary rake angle a2 is approximately 20°. This angle setting ensures the sharpness of the milling insert 10, allowing the insert to successfully complete milling operations even under high feed conditions.

[0050] The peripheral side 13 has a flank face (not shown) along the cutting edge. The flank face includes a main flank face 131, a secondary flank face 132, and an angular flank face 133. In the direction from the upper surface 11 to the lower surface 12, the main flank face 131 is inclined away from the center hole 101, which can increase the thickness of the main cutting edge 15 at the cutting position and improve the strength of the cutting edge of the insert. The secondary flank face 132 is inclined towards the center hole 101, so that when the insert is performing oblique downward machining, the secondary flank face 132 can better avoid interference between the secondary flank face 132 and the machined surface of the workpiece.

[0051] The intersection of the main front cutting face 111 and the main rear cutting face 131 forms the main cutting edge 15, the intersection of the secondary front cutting face 112 and the secondary rear cutting face 132 forms the secondary cutting edge 16, and the intersection of the corner front cutting face 113 and the corner rear cutting face 133 forms the corner cutting edge 14.

[0052] Please see Figure 2 When viewed from the front, the primary flank face 131 and the secondary flank face 132, the secondary cutting edge 16 is straight, while the primary cutting edge 15 is an upwardly convex curve, with a smooth transition between the primary and secondary cutting edges 15 and 16. When the milling insert 10 processes a workpiece, the upwardly convex curve of the primary cutting edge 15 allows the most prominent point of the primary cutting edge 15 to contact the workpiece first, followed by other points on the curve that gradually come into contact with the workpiece. This avoids the entire primary cutting edge 15 contacting the workpiece at once, reducing cutting impact force.

[0053] Please see Figure 3The rake face 113 includes a first rake face 114 and a second rake face 115. The first rake face 114 and the second rake face 115 are distributed radially along the milling insert 10. One side of the first rake face 114 is connected to the corner cutting edge 14, and the other side of the first rake face 114 is transitionally connected to the second rake face 115.

[0054] Please see Figure 6 The rake angle of the first rake face 114 is the first rake angle b1, that is, the first rake angle b1 is the angle between the first rake face 114 and the reference line parallel to the upper surface 11 and passing through the cutting edge 14; the rake angle of the second rake face 115 is the second rake angle b2, that is, the second rake angle b2 is the angle between the second rake face 115 and the reference line parallel to the upper surface 11 and passing through the cutting edge 14. Both the first rake angle b1 and the second rake angle b2 are positive values, which can ensure cutting performance.

[0055] Furthermore, the first rake angle b1 is smaller than the second rake angle b2. That is, the angle α between the first rake face 114 and the corner cutting edge face 133 is greater than the angle β between the second rake face 115 and the corner cutting edge face 133. The angle at the cutting position of the blade becomes larger, which enhances the strength of the corner cutting edge 14 and prevents the corner cutting edge 14 from being too sharp and breaking during processing.

[0056] Specifically, the angle range of the first anterior angle b1 is 10° to 15°. The angles of the primary anterior angle a1 and the secondary anterior angle a2 are both greater than the angle of the first anterior angle b1.

[0057] The angle of the first rake angle b1 gradually decreases from both ends of the first rake face 114 towards the middle to ensure that the middle part of the cutting edge has sufficient strength. That is, please refer to... Figure 7 The first rake angle b1' corresponding to one end of the first rake face 114 is greater than the first rake angle b1 corresponding to the middle of the first rake face 114.

[0058] Please see Figure 3 For ease of explanation, the multiple cutting edges 14 of the milling insert 10 are defined as follows: a first cutting edge 141, a second cutting edge 142, and a third cutting edge 143. The cutting edge between the first cutting edge 141 and the second cutting edge 142 is the first primary cutting edge 151 and the first secondary cutting edge 161; the cutting edge between the first cutting edge 141 and the third cutting edge 143 is the second primary cutting edge 152 and the second secondary cutting edge 162. That is, the first primary cutting edge 151 and the second secondary cutting edge 162 are located on either side of the first cutting edge 141. Correspondingly, the primary rake face corresponding to the first primary cutting edge 151 is the first primary rake face 1111, and the primary rake face corresponding to the second secondary cutting edge 162 is the second secondary rake face 1121.

[0059] The upper surface 11 is provided with a first connecting portion 116 and a second connecting portion 117. When viewed directly, one end of the first front cutting face 114 is transitionally connected to the second secondary cutting edge 162 through the first connecting portion 116, and the other end of the first front cutting face 114 is transitionally connected to the first main cutting edge 151 through the second connecting portion 117. The width of the first connecting portion 116 gradually decreases from the first front cutting face 114 toward the second secondary front cutting face 1121 and extends to meet the second secondary cutting edge 161. The width of the second connecting portion 117 gradually decreases from the first front cutting face 114 toward the first main front cutting face 1111 and extends to meet the first main cutting edge 151.

[0060] The upper surface 11 is also provided with a third connecting portion 118 and a fourth connecting portion 119. When viewed directly from the upper surface 11, one end of the second rake face 115 is connected to the second secondary rake face 1121 via the third connecting portion 118, and the other end of the second rake face 115 is connected to the first main rake face 1111 via the fourth connecting portion 119. The width of the second rake face 115 gradually increases from the end closest to the fourth connecting portion 119 towards the other end, and the width of the third connecting portion 118 gradually increases from the second rake face 115 toward the second secondary rake face 1121. The width of the fourth connecting portion 119 gradually increases from the second rake face 115 toward the first main rake face 1111.

[0061] Please see Figure 8 and Figure 9 This embodiment also provides a milling cutter 1, which includes a tool holder 20 and a milling insert 10 mounted on the tool holder 20. The tool holder 20 is cylindrical and rotates along its axial direction, driving the milling insert 10 to cut the workpiece in the cutting direction.

[0062] Please see Figure 10 The tool holder 20 has a dedicated mounting groove 21 at its front end for mounting the milling insert 10. The opening of the mounting groove 21 faces the periphery of the tool holder 20, and a mounting hole 22 is provided on the bottom surface of the mounting groove 21. Through the mounting hole 22, the milling insert 10 can be securely mounted in the mounting groove 21 using bolts or other fasteners. The shape of the mounting groove 21 is adapted to the shape of the milling insert 10. The lower surface 12 of the milling insert 10 contacts the bottom surface of the mounting groove 21, and the peripheral side 13 of the milling insert 10 abuts against the inner side of the mounting groove 21, thus limiting the position of the milling insert 10. This tight-fitting mounting method ensures that the insert will not shift or loosen during high-speed rotating cutting, guaranteeing machining accuracy and operator safety.

[0063] In the side view of the tool holder 20, the bottom surface of the mounting groove 21 gradually slopes towards the axial center line H of the tool holder 20 from the front end to the rear end, meaning the axial rake angle d of the bottom surface of the mounting groove 21 is negative. A negative value represents clockwise rotation from the bottom surface of the mounting groove 21 towards the axial center line H of the tool holder 20, while a positive value represents counterclockwise rotation.

[0064] Please see Figure 8 , Figure 11 and Figure 12 When the milling insert is mounted on the tool holder, on the section EE perpendicular to the central axis H of the tool holder 20 and passing through the corner cutting edge 14, the outermost point of the corner cutting edge 14 is the vertex. The line connecting the central axis of the tool holder 20 and the vertex is the baseline F. An angle θ is formed between the first rake face 114 and the baseline F. The angle θ is negative. Specifically, in this embodiment, the angle θ is approximately -4°.

[0065] Please see Figure 6 The angle α between the first rake face 114 and the corner cutting edge flank face 133 is greater than the angle β between the second rake face 115 and the corner cutting edge flank face 133. This increases the angle at the insert's entry point, enhancing the strength of the corner cutting edge 14 and preventing it from chipping during machining. Before insert installation, the rake angles of both the first and second rake faces 114 and 115 are positive, ensuring cutting performance. Therefore, this insert can simultaneously achieve both machinability and chip resistance during cutting.

[0066] In the top view of the tool holder, the approach angle c1 of the primary cutting edge of the milling insert is 10° to 20°. The cutting thickness is determined by the tool's approach angle; reducing the approach angle increases the feed rate. Under the same chip thickness conditions, if the approach angle is set to 90° and the feed per cutting edge of the tool holder is set to 0.2 mm / t, where mm is millimeters and t is the number of milling inserts, i.e., the number of cutting edges, a high-feed tool holder can increase this to 0.77 mm / t. When the approach angle c1 is set smaller, the cutting resistance is lower, and the resistance experienced by the corner cutting edge is also reduced, which can increase the cutting feed rate and achieve high-speed, high-efficiency machining. In addition, in this embodiment, the approach angle c2 of the secondary cutting edge of the milling insert is 19° to ensure that the secondary cutting edge can perform downward slope machining.

[0067] The milling cutter 1 and its milling insert 10 of this invention improve the strength of the corner cutting edge 14 by setting the corner cutting edge 14 to have two different angles: a first rake face 114 and a second rake face 115. Furthermore, the bottom surface of the mounting groove 21 on the tool holder 20 of the milling cutter 1 is set with a negative axial rake angle d, so that after the insert is installed, the actual cutting rake angle of the first rake face 114 becomes negative, increasing the included angle at the cutting position of the milling insert 10, enhancing the strength of the corner cutting edge 14, and improving its resistance to chipping. This solves the problem of easy chipping of the corner cutting edge 14 when the milling insert 10 performs high-feed machining.

[0068] Although the present invention has been described with reference to several typical embodiments, it should be understood that the terminology used is descriptive and exemplary, and not restrictive. Since the present invention can be embodied in many forms without departing from the spirit or essence of the invention, it should be understood that the above embodiments are not limited to any of the foregoing details, but should be interpreted broadly within the spirit and scope defined by the appended claims. Therefore, all variations and modifications falling within the scope of the claims or their equivalents should be covered by the appended claims.

Claims

1. A milling insert, characterized in that, include: The device has an upper and lower polygonal surface and a peripheral side surface connected between the upper and lower surfaces. The intersection of the peripheral side surface and the upper surface forms a cutting edge. The cutting edge includes a corner cutting edge located at the apex of the polygon and a main cutting edge and a secondary cutting edge located between two adjacent corner cutting edges. The upper surface extends along the cutting edge and has a rake face. The peripheral side surface extends along the cutting edge and has a flank face. The rake face includes a main rake face, a secondary rake face, and a corner rake face; the flank face includes a main flank face, a secondary flank face, and a corner flank face; the intersection of the main rake face and the main flank face forms the main cutting edge; the intersection of the secondary rake face and the secondary flank face forms the secondary cutting edge; and the intersection of the corner rake face and the corner flank face forms the corner cutting edge. The rake face includes a first rake face and a second rake face. One side of the first rake face is connected to the corner cutting edge, and the other side of the first rake face is transitionally connected to the second rake face. The rake angle of the first rake face is the first rake angle, and the rake angle of the second rake face is the second rake angle. The first rake angle is smaller than the second rake angle.

2. The milling insert according to claim 1, characterized in that, The rake angle of the primary rake face is the primary rake angle, and the rake angle of the secondary rake face is the secondary rake angle. The angles of both the primary rake angle and the secondary rake angle are greater than the angle of the primary rake angle.

3. The milling insert according to claim 1, characterized in that, The angle range of the first front angle is 10° to 15°.

4. The milling insert according to claim 1, characterized in that, The angle of the first rake angle gradually decreases from both ends of the first rake face toward the middle.

5. The milling insert according to claim 1, characterized in that, The upper surface is provided with a first connecting part and a second connecting part. When the upper surface is viewed directly, one end of the first rake face is connected to the secondary cutting edge through the first connecting part, and the other end of the first rake face is connected to the main cutting edge through the second connecting part. The width of the first connecting part gradually decreases from the first rake face toward the secondary rake face and extends to connect with the secondary cutting edge. The width of the second connecting part gradually decreases from the first rake face toward the main rake face and extends to connect with the main cutting edge. The upper surface is also provided with a third connecting portion and a fourth connecting portion. When the upper surface is viewed directly, one end of the second rake face is connected to the secondary rake face through the third connecting portion, and the other end of the second rake face is connected to the main rake face through the fourth connecting portion. The width of the second rake face gradually increases from the end closest to the fourth connecting portion toward the other end. The width of the third connecting portion gradually increases from the second rake face toward the secondary rake face, and the width of the fourth connecting portion gradually increases from the second rake face toward the main rake face.

6. The milling insert according to claim 1, characterized in that, The milling insert has a central hole that passes through the upper and lower surfaces. In the direction from the upper surface to the lower surface, the main flank face is inclined away from the central hole, and the secondary flank face is inclined towards the central hole.

7. The milling insert according to claim 1, characterized in that, When viewed from the front, the main back face and the secondary back face are straight, the secondary cutting edge is straight, the main cutting edge is an upwardly convex curve, and the main cutting edge and the secondary cutting edge are smoothly connected.

8. A milling tool, characterized in that, The tool holder includes a tool holder and a milling insert as described in any one of claims 1-7 mounted on the tool holder. The tool holder has a mounting groove at its front end for mounting the milling insert. In a side view of the tool holder, the bottom surface of the mounting groove gradually slopes towards the axial centerline of the tool holder from the front end toward the rear end of the tool holder, i.e., the axial rake angle of the bottom surface of the mounting groove is negative.

9. The milling tool according to claim 8, characterized in that, The outermost point of the corner blade is the vertex, and the line connecting the central axis of the handle and the vertex is the baseline. The angle between the first rake face and the baseline is negative.

10. The milling tool according to claim 8, characterized in that, In the top view of the handle, the cutting angle of the main cutting edge of the blade is 10° to 20°.

Images