Milling tools

Abstract

The present invention provides a milling tool, which includes: a tool holder, having a mounting hole, the inner contour of the cross section of the mounting hole being a polygonal structure; a cutter disc, including a main body and a mounting protrusion connected to each other, the mounting protrusion being inserted into the mounting hole, the outer contour of the cross section of the mounting protrusion being adapted to the inner contour of the cross section of the mounting hole; a connecting piece, which is detachably arranged in the mounting hole, the first end of the connecting piece being connected to the tool holder, and the second end of the connecting piece being connected to the mounting protrusion. The technical solution provided by the present application can solve the problems of short tool life and high cost in the prior art.

Description

Technical Field

[0001] The invention relates to the technical field of processing equipment, and in particular to a milling cutter. Background Art

[0002] At present, the milling cutter disc is an integral structure, and the material of the milling cutter disc is cemented carbide, which makes the milling cutter disc difficult to process and has high cost. In addition, since the milling cutter disc is an integral structure, when using the milling cutter disc to process the workpiece, if the milling cutter disc is damaged, the milling cutter disc needs to be replaced as a whole, resulting in a short service life of the tool and high processing cost.

[0003] Therefore, there are problems in the prior art such as short tool life and high cost. Summary of the invention

[0004] The invention provides a milling cutter to solve the problems of short service life and high cost of the cutter in the prior art.

[0005] The present invention provides a milling tool, which comprises: a tool holder, which has a mounting hole, and the inner contour of the cross section of the mounting hole is a polygonal structure; a tool disc, which comprises a main body and a mounting protrusion that are connected to each other, and the mounting protrusion is inserted into the mounting hole, and the outer contour of the cross section of the mounting protrusion is adapted to the inner contour of the cross section of the mounting hole; a connecting piece, which is detachably arranged in the mounting hole, and the first end of the connecting piece is connected to the tool holder, and the second end of the connecting piece is connected to the mounting protrusion.

[0006] Furthermore, the tool holder and the mounting protrusion are both threadedly connected to the connecting piece, the first end of the connecting piece is provided with a first thread structure, and the second end of the connecting piece is provided with a second thread structure, and the thread rotation direction of the first thread structure is opposite to the thread rotation direction of the second thread structure.

[0007] Furthermore, the first end and the second end of the connecting piece are both provided with external threads, a threaded hole is provided on the bottom wall of the mounting hole, the cutter disc has a through hole passing through the main body and the mounting protrusion, at least part of the through hole is provided with an internal thread, and the second end of the connecting piece is provided with a tightening force portion, and the through hole is provided corresponding to the tightening force portion.

[0008] Furthermore, the milling tool also includes a blade, and an installation groove is provided at one end of the main body away from the installation protrusion, and the blade is detachably arranged in the installation groove.

[0009] Furthermore, the blade has a front end face, a first side face, a rear end face and a second side face that are relatively arranged. The first side face is arranged corresponding to the bottom wall of the mounting groove, the second side face is arranged corresponding to the notch of the mounting groove, the front end face is an inclined face, and the inclination angle of the front end face is between 10° and 20°.

[0010] Furthermore, the first side surface is a plane, and the bottom wall of the mounting groove is a plane.

[0011] Furthermore, the first side surface is a first inclined surface, the bottom wall of the mounting groove is a second inclined surface, and the first inclined surface is in contact with the second inclined surface.

[0012] Furthermore, the blade also includes a top surface and a bottom surface, a positioning groove is arranged on the top surface and / or the bottom surface, a positioning boss is arranged on the side wall of the installation groove, and the positioning boss is inserted into the positioning groove.

[0013] Furthermore, the positioning groove includes a first positioning surface and a second positioning surface which are connected to each other, and an angle is formed between the first positioning surface and the second positioning surface.

[0014] Furthermore, a locking hole penetrating the first side surface and the second side surface is provided on the blade, and an extending direction of the positioning groove is perpendicular to an axis of the locking hole.

[0015] By applying the technical solution of the present invention, the milling tool includes a tool holder, a cutter disc and a connecting piece, and the cutter disc is detachably connected to the tool holder. The inner contour of the cross section of the mounting hole of the tool holder is a polygonal structure, the mounting protrusion of the cutter disc is inserted into the mounting hole, and the outer contour of the cross section of the mounting protrusion is adapted to the inner contour of the cross section of the mounting hole. By detachably arranging the connecting piece in the mounting hole, connecting the tool holder with the first end of the connecting piece, and connecting the mounting protrusion with the second end of the connecting piece, the cutter disc and the tool holder can be detachably connected. With the above structure, the milling tool is divided into a tool holder and a cutter disc, which is convenient for processing the cutter disc, and in the process of processing a workpiece using the milling tool, if the milling tool is damaged, only the cutter disc needs to be replaced, without replacing the entire milling tool, which can increase the service life of the milling tool and reduce the manufacturing and processing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0017] Figure 1 A schematic structural diagram of a milling tool provided according to a first embodiment of the present invention is shown;

[0018] Figure 2 A schematic structural diagram of a blade of a milling tool provided according to a first embodiment of the present invention is shown;

[0019] Figure 3 A front view of a blade of a milling tool provided according to a first embodiment of the present invention is shown;

[0020] Figure 4 Shows Figure 3 Sectional view at AA in the middle;

[0021] Figure 5A top view of a blade of a milling tool provided according to a first embodiment of the present invention is shown;

[0022] Figure 6 A schematic structural diagram of a blade of a milling tool provided according to a second embodiment of the present invention is shown;

[0023] Figure 7 A front view of a blade of a milling tool provided according to a second embodiment of the present invention is shown;

[0024] Figure 8 Shows Figure 7 Sectional view at the middle BB;

[0025] Fig. 9 A top view of a blade of a milling tool provided according to a second embodiment of the present invention is shown;

[0026] Fig.10 A schematic structural diagram of a blade of a milling tool provided according to a third embodiment of the present invention is shown;

[0027] Fig.11 A front view of a blade of a milling tool provided according to a third embodiment of the present invention is shown;

[0028] Fig.12 Shows Fig.11 Sectional view at CC;

[0029] Fig.13 A top view of a blade of a milling tool provided according to a third embodiment of the present invention is shown;

[0030] Fig.14 A schematic diagram showing the angle of a blade of a milling tool provided according to the first embodiment of the present invention is shown;

[0031] Fig.15 Another angle schematic diagram of the blade of the milling tool provided according to the first embodiment of the present invention is shown.

[0032] The above drawings include the following reference numerals:

[0033] 10. Tool holder; 11. Mounting hole; 20. Tool disc; 21. Main body; 211. Mounting groove; 22. Mounting protrusion; 23. Through hole; 30. Connector; 40. Blade; 41. Front end face; 42. First side face; 43. Rear end face; 44. Second side face; 45. Top face; 46. Bottom face; 47. Positioning groove; 471. First positioning face; 472. Second positioning face; 48. Locking hole; 481. First section; 482. Second section; 483. Third section; 50. Adjusting screw; 60. Locking screw; a. Inclination angle of the front end face; b. Angle between the tangent at the junction of the end of the tool head and the first side face and the first side face. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] like Figures 1 to 5 As shown, a first embodiment of the present invention provides a milling tool, which includes a tool holder 10, a cutter disc 20 and a connecting member 30, wherein the cutter disc 20 is detachably connected to the tool holder 10 via the connecting member 30. The tool holder 10 has a mounting hole 11, and the inner contour of the cross section of the mounting hole 11 is a polygonal structure. The cutter disc 20 includes a main body 21 and a mounting protrusion 22 that are connected to each other, and the mounting protrusion 22 is inserted into the mounting hole 11, and the outer contour of the cross section of the mounting protrusion 22 is adapted to the inner contour of the cross section of the mounting hole 11. By setting the inner contour of the cross section of the mounting hole 11 to a polygonal structure, and adapting the outer contour of the cross section of the mounting protrusion 22 to the inner contour of the cross section of the mounting hole 11, after the mounting protrusion 22 of the cutter disc is inserted into the mounting hole 11 of the tool holder, the cutter disc 20 will not rotate relative to the tool holder 10, which is convenient for processing using a milling tool. Specifically, the connecting member 30 is detachably disposed in the mounting hole 11 , a first end of the connecting member 30 is connected to the tool holder 10 , and a second end of the connecting member 30 is connected to the mounting protrusion 22 , thereby achieving a detachable connection between the tool disc 20 and the tool holder 10 .

[0036] The milling tool provided in this embodiment is applied, by dividing the milling tool into a tool holder 10 and a cutter disc 20, and using a connecting piece 30 to realize a detachable connection between the cutter disc and the tool holder, so as to facilitate the processing and assembly of the cutter disc 20. In the process of processing the workpiece using the milling tool, since the inner contour of the cross section of the mounting hole 11 is a polygonal structure, the cutter disc 20 will not rotate relative to the tool holder 10, so as to facilitate the processing using the milling tool. If the milling tool is damaged, only the cutter disc 20 needs to be replaced, without replacing the entire milling tool, which can increase the service life of the milling tool and reduce the manufacturing and processing costs.

[0037] The polygonal structure includes shapes such as triangle, quadrilateral, hexagon and octagon. In this embodiment, the inner contour of the cross section of the mounting hole 11 is a triangular structure. Specifically, the cross section of the mounting hole 11 includes three sides connected end to end, and each side is an arc structure. The above structure is adopted, which is convenient for inserting the mounting protrusion of the cutter disc into the mounting hole of the tool holder, and can prevent the cutter disc from rotating relative to the tool holder.

[0038] In the present embodiment, the tool holder 10 and the mounting protrusion 22 are both threadedly connected to the connecting member 30, the first end of the connecting member 30 is provided with a first thread structure, and the second end of the connecting member 30 is provided with a second thread structure, and the thread rotation direction of the first thread structure is opposite to the thread rotation direction of the second thread structure. The connection between the tool holder 10 and the cutter disc 20 is achieved by threaded connection, which has the advantage of being easy to assemble. Among them, the connecting member 30 can be provided with both internal threads and external threads, as long as the connecting member can be threadedly connected to the tool holder and the cutter disc. By making the thread rotation direction of the first thread structure and the thread rotation direction of the second thread structure opposite, when assembling the cutter disc and the tool holder, it is only necessary to rotate the connecting member, and the connecting member can use the first thread structure and the second thread structure to drive the cutter disc to move toward the tool holder, thereby completing the assembly.

[0039] Specifically, both the first and second ends of the connector 30 are provided with external threads. In the present embodiment, the mounting hole 11 is a countersunk hole, and a threaded hole is provided on the bottom wall of the mounting hole 11, and the threaded hole can cooperate with the external thread of the first end of the connector 30 to achieve the threaded connection between the first end of the connector and the tool holder. The cutter head 20 has a through hole 23 that penetrates the main body 21 and the mounting protrusion 22, and at least part of the through hole 23 is provided with an internal thread, and the internal thread cooperates with the external thread of the second end of the connector 30 to achieve the threaded connection between the second end of the connector and the cutter head. In other embodiments, threaded holes can be provided on both the first and second ends of the connector 30, and then external threads can be provided on the tool holder 10 and the mounting protrusion 22 to achieve the threaded connection between the tool holder 10 and the mounting protrusion 22 and the connector 30. In the present embodiment, the second end of the connector 30 is provided with a tightening force receiving portion, and the through hole 23 is provided corresponding to the tightening force receiving portion, so that the installation tool can be inserted into the through hole, and then the tightening force receiving portion is used to drive the connector 30 to rotate. Specifically, the second end of the connecting member 30 is provided with an inner hexagonal hole, which forms a tightening force-bearing portion. An outer hexagonal wrench can be used in conjunction with the inner hexagonal hole to drive the connecting member to rotate, thereby achieving assembly of the cutter disc and the cutter holder.

[0040] like Figure 1 As shown, the milling tool further includes a blade 40, and a mounting groove 211 is provided at one end of the main body 21 away from the mounting protrusion 22, and the blade 40 is detachably disposed in the mounting groove 211. By detachably arranging the blade 40 on the cutter head 20, when the milling tool is used to process the workpiece, if part of the blade is damaged, only the damaged blade needs to be replaced, without replacing the entire milling tool, which can further reduce the processing cost.

[0041] like Fig.14As shown, the blade 40 has a front face 41, a first side face 42, a rear face 43 and a second side face 44 which are arranged opposite to each other. The first side face 42 is arranged corresponding to the bottom wall of the mounting groove 211, and the second side face 44 is arranged corresponding to the notch of the mounting groove 211. In this embodiment, the notch of the mounting groove refers to the side of the mounting groove opposite to the bottom wall. Among them, the front face 41 is an inclined surface, and the inclination angle a of the front face 41 is between 10° and 20°. By setting the inclination angle a of the front face 41 within the above range, it is convenient to use the tool head at the front face to mill the workpiece. If the inclination angle of the front face 41 is less than 10°, the front face will affect the milling effect. If the inclination angle of the front face 41 is greater than 20°, the structural strength of the tool head cannot be guaranteed. In this embodiment, the inclination angle a of the front face 41 is 15°. In other embodiments, the inclination angle of the front face 41 can be set to 12°, 14°, 16°, or 18°.

[0042] In this embodiment, the first side surface 42 is a plane, and the bottom wall of the installation groove 211 is a plane, which has the advantages of simple structure and low cost, convenient installation of the blade, and simple operation.

[0043] In this embodiment, a blade is provided with a cutter head, and the material of the cutter head includes PCBN and PCD, so as to increase the service life of the blade, and the base of the blade is cemented carbide, wherein PCBN is polycrystalline cubic boron nitride, and PCD is polycrystalline diamond.

[0044] like Fig.15 As shown, the blade head is a circular arc symmetrical structure, and the angle b between the tangent line at the junction of the end of the blade head and the first side surface and the first side surface is between 5° and 15°. In this embodiment, the angle b between the tangent line at the junction of the end of the blade head and the first side surface and the first side surface is 10°.

[0045] In this embodiment, the milling tool comprises a milling cutter disc. Specifically, the milling tool comprises a ballway hard milling cutter disc.

[0046] like Figure 1 As shown, the milling tool also includes an adjusting screw 50, the rear end face 43 of the blade 40 has a plurality of inclined surfaces, and the adjusting screw has a conical surface. The adjusting screw cooperates with the rear end face 43 of the blade 40 to achieve the function of adjusting the radial position of the blade.

[0047] like Figures 6 to 9As shown, the second embodiment of the present invention provides a milling tool. The difference between the second embodiment and the first embodiment is that in the second embodiment, the first side surface 42 is a first inclined surface, the bottom wall of the mounting groove 211 is a second inclined surface, and the first inclined surface fits the second inclined surface. By setting the inclined surface, when the blade is installed in the mounting groove, the first side surface of the blade and the bottom wall of the mounting groove are precisely matched, which can improve the assembly accuracy. Among them, the inclination angle of the first side surface 42 is between 1° and 5°. If the inclination angle of the first side surface 42 is less than 1°, it will not play the role of assembly positioning; if the inclination angle of the first side surface 42 is greater than 5°, the structural strength of the blade cannot be guaranteed. In this embodiment, the inclination angle of the first side surface 42 is 2°. In other embodiments, the inclination angle of the first side surface 42 can be set to 3° or 4°.

[0048] like Figures 10 to 13 As shown, the third embodiment of the present invention provides a milling tool, and the difference between the third embodiment and the first embodiment is that in the third embodiment, the blade 40 further includes a top surface 45 and a bottom surface 46, and a positioning groove 47 is provided on the top surface 45 and / or the bottom surface 46, and a positioning boss is provided on the side wall of the mounting groove 211, and the positioning boss is inserted in the positioning groove 47. By using the matching method of the positioning boss and the positioning groove, the blade is installed in the mounting groove more stably, and the matching accuracy between the side of the blade and the mounting groove is improved.

[0049] Among them, the positioning groove 47 can be set on the top surface 45, or the positioning groove 47 can be set on the bottom surface 46, or the positioning groove 47 can be set on both the top surface 45 and the bottom surface 46. In this embodiment, the positioning groove 47 is set on the bottom surface 46, and a positioning boss is set on one of the side walls of the installation groove. When the blade is assembled into the installation groove, the positioning boss and the positioning groove cooperate to play a guiding and positioning role, which can improve the assembly accuracy. In other embodiments, the positioning boss can be set on the blade, and the positioning groove can be set in the installation groove.

[0050] In this embodiment, the positioning groove 47 includes a first positioning surface 471 and a second positioning surface 472 connected to each other, and an angle is formed between the first positioning surface 471 and the second positioning surface 472. Specifically, a V-shaped positioning groove is provided on the bottom surface of the blade, and a V-shaped positioning boss is also provided on the side wall of the mounting groove that cooperates with the V-shaped positioning groove. In other embodiments, the cross-sectional shape of the positioning groove can be set to an arc structure or a polygonal structure, as long as it can play a role in positioning and reinforcement.

[0051] like Fig.12 As shown, the blade 40 is provided with a locking hole 48 which passes through the first side surface 42 and the second side surface 44, and the extension direction of the positioning groove 47 is perpendicular to the axis of the locking hole 48. In this way, the positioning groove and the positioning boss can cooperate to play a role in positioning and reinforcement, and the structural strength of the blade itself can be ensured.

[0052] The locking hole 48 includes a first section 481, a second section 482 and a third section 483 connected in sequence, and the locking hole is a symmetrical structure. Specifically, the first section 481 and the third section 483 are respectively located at the two ends of the locking hole, and the apertures of the first section and the third section are larger than the aperture of the second section. The hole wall of the second section 482 is an arc-shaped structure. The aperture of the locking hole is the smallest at the center of the second section, and the aperture of the second section gradually increases in the direction away from the center of the second section. The above structure makes it easy to lock the blade on the cutter disc using the locking screw 60. Since the locking hole is a symmetrical structure, the blade can be installed on both sides, which can improve assembly efficiency.

[0053] Specifically, the positioning groove extends along the length direction of the blade, and the positioning boss extends along the radial direction of the blade disc. In this way, during the process of assembling the blade into the installation groove, the positioning boss and the positioning groove can play a guiding and positioning role. After the blade is assembled, the positioning boss is stuck in the positioning groove, which can improve the stability of the blade in the installation groove.

[0054] The milling tool provided by the embodiment has the following beneficial effects:

[0055] (1) The milling tool is divided into a tool holder 10 and a cutter disc 20, and a connecting member 30 is used to realize a detachable connection between the cutter disc and the tool holder, so as to facilitate the processing and assembly of the cutter disc 20;

[0056] (2) The blade 40 is detachably arranged on the cutter head 20. When a workpiece is processed by the milling tool, if part of the blade is damaged, only the damaged blade needs to be replaced without replacing the entire milling tool, which can further reduce the processing cost.

[0057] (3) By providing an inclined surface on the blade, when the blade is installed in the installation groove, the first side surface of the blade and the bottom wall of the installation groove are precisely matched, thereby improving the assembly accuracy;

[0058] (4) By setting a positioning groove on the blade and setting a positioning boss in the mounting groove, the positioning boss cooperates with the positioning groove, so that the blade is installed in the mounting groove more stably, and the matching accuracy between the blade side and the mounting groove is improved.

[0059] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0060] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, numerical expressions and numerical values ​​do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0061] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0062] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0063] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0064] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A milling tool, characterized in that: The milling tool comprises: A tool holder (10) having a mounting hole (11), wherein the inner contour of the cross section of the mounting hole (11) is a polygonal structure; A cutter disc (20) comprises a main body (21) and a mounting protrusion (22) which are connected to each other, wherein the mounting protrusion (22) is inserted into the mounting hole (11), and the outer contour of the cross section of the mounting protrusion (22) is adapted to the inner contour of the cross section of the mounting hole (11); a connecting member (30) detachably disposed in the mounting hole (11), wherein a first end of the connecting member (30) is connected to the tool holder (10), and a second end of the connecting member (30) is connected to the mounting protrusion (22); A blade (40), wherein a mounting groove (211) is provided at one end of the main body (21) away from the mounting protrusion (22), and the blade (40) is detachably arranged in the mounting groove (211); the blade (40) comprises a front end face (41), a first side face (42), a rear end face (43) and a second side face (44) which are arranged opposite to each other; the first side face (42) is arranged corresponding to the bottom wall of the mounting groove (211), and the second side face (44) is arranged corresponding to the notch of the mounting groove (211); the front end face (41) is an inclined face, and the inclination angle of the front end face (41) is between 10° and 20°; the first side face (42) is a first inclined face, and the bottom wall of the mounting groove (211) is a second inclined face, the first inclined face is in contact with the second inclined face, and the inclination angle of the first side face (42) is between 1° and 5°; The inner contour of the cross section of the mounting hole (11) is a triangular-shaped structure, and the cross section of the mounting hole (11) comprises three sides connected end to end, and each side is an arc-shaped structure.

2. The milling tool according to claim 1, characterized in that The tool holder (10) and the mounting protrusion (22) are both threadedly connected to the connecting member (30); a first thread structure is provided at a first end of the connecting member (30); a second thread structure is provided at a second end of the connecting member (30); and the thread rotation direction of the first thread structure is opposite to the thread rotation direction of the second thread structure.

3. The milling tool according to claim 2, characterized in that The first end and the second end of the connecting member (30) are both provided with external threads, the bottom wall of the mounting hole (11) is provided with a threaded hole, the cutter disc (20) has a through hole (23) penetrating the main body (21) and the mounting protrusion (22), at least part of the through hole (23) is provided with an internal thread, the second end of the connecting member (30) is provided with a tightening force-bearing portion, and the through hole (23) is provided corresponding to the tightening force-bearing portion.

4. The milling tool according to claim 1, characterized in that The blade (40) further comprises a top surface (45) and a bottom surface (46); a positioning groove (47) is provided on the top surface (45) and / or the bottom surface (46); a positioning boss is provided on the side wall of the mounting groove (211); and the positioning boss is inserted into the positioning groove (47).

5. The milling tool according to claim 4, characterized in that The positioning groove (47) comprises a first positioning surface (471) and a second positioning surface (472) which are connected to each other, and an angle is formed between the first positioning surface (471) and the second positioning surface (472).

6. The milling tool according to claim 4, characterized in that The blade (40) is provided with a locking hole (48) penetrating the first side surface (42) and the second side surface (44); the extending direction of the positioning groove (47) is perpendicular to the axis of the locking hole (48).

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