Milling insert and method for determining edge width of milling insert

Abstract

The milling blade comprises a connecting section, a first end face and a second end face, the first end face and the second end face are located at the two ends of the connecting section respectively, the first end face and the second end face are circular, and the periphery of the first end face is obliquely arranged in the direction of the second end face with the circle center of the first end face as the center; a first edge strip is formed at the joint of the first end surface and the connecting section; the milling cutter blade is provided with a plurality of positioning parts, the connecting part of the cutter head is connected with each positioning part, and the plurality of positioning parts are arranged around the connecting part; the edge width of the first edge strip corresponding to the first center line is the minimum value of the edge width of the first edge strip, the edge width of the first edge strip corresponding to the second center line is the maximum value of the edge width of the first edge strip, the first center line is the center line of the positioning part, and the second center line is the center line of the distance between the two adjacent positioning parts. Based on this, the machining performance of the milling blade is further improved through the variable first margin width design.

Description

Technical Field

[0001] The present invention belongs to the field of machining, and particularly relates to a milling insert and a method for determining the edge width of the milling insert. Background Art

[0002] For rough milling single-sided profiling milling inserts used in the machining industry, in order to ensure their structural strength, the edge width of their land is usually designed to be uniformly the same width. For milling inserts with equal edge width, the cutting edge length of their cutting edges is greater, and they have a stronger cutting force sharing ability, so they are more durable. However, if the edge width of the entire circular milling insert is all set to be equal edge width, it will cause the strength in the high-load area to be possibly insufficient (easy to chip), and the friction in the low-load area will increase due to the too thick edge (reducing the service life and surface quality).

[0003] Therefore, in order to solve the above problems, in the prior art, the width of the cutting edge is usually adjusted so that the milling insert can take into account the sharpness and strength of the cutting edge and enhance the chipping resistance of the insert. Among them, the patent with the publication number CN202517098U proposes a circular milling insert. The circular insert is a cone with a positioning through hole in the center, and the cone is evenly divided into 4 to 8 cutting units with the same structure along the radial direction; each cutting unit includes a bottom surface, a top surface, and a conical side surface connecting the top surface and the bottom surface. The top surface and the side surface intersect at an acute angle in the axial section to form a cutting edge. The outermost side of the upper surface of the cutting edge is a land plane, and the land plane extends from the inclined rake face towards the axis. The land width plane and the rake face form a rake angle γ in the axial section; the width of the land plane varies between 0.05 mm and 0.4 mm with the circumferential angle, and the rake angle γ varies between 10° and 30° with the circumferential angle. Thus, through the cutting edge width and the rake angle that can vary with the cutting depth, the sharpness and strength of the cutting edge can be taken into account, the chipping resistance of the insert can be enhanced, the service life of the insert can be improved, the machining surface quality can be guaranteed, and the insert can adapt to the changes in the chip breaking range, feed rate, and cutting depth.

[0004] However, the above patent ignores the dynamic load differences at different circumferential positions (such as the cutting-in / cutting-out points, the lowest point) during the cutting process. As a result, the uniformly distributed cutting units lead to local strength redundancy or insufficiency, the high-load area is easy to chip, and the friction and wear in the low-load area are aggravated due to the too thick edge. There are still technical problems of poor cutting performance in the prior art. Summary of the Invention

[0005] The present invention provides a milling insert and a method for determining the edge width of the milling insert, which improves the cutting performance of the milling insert.

[0006] According to the first aspect of the present invention, a milling insert is provided, which may include:

[0007] A connecting section, a first end face and a second end face respectively located at two ends of the connecting section. Both the first end face and the second end face are circular. The outer periphery of the first end face is inclined towards the second end face with the center of the first end face as the center, so that a first cutting edge band is formed at the connection between the first end face and the connecting section.

[0008] The milling blade is provided with a plurality of positioning parts. The connecting part of the cutter head is connected to each positioning part, and the plurality of positioning parts are arranged around the connecting part.

[0009] The cutting edge width of the first cutting edge band corresponding to the first median line is the minimum value of the cutting edge width of the first cutting edge band. The cutting edge width of the first cutting edge band corresponding to the second median line is the maximum value of the cutting edge width of the first cutting edge band. The first median line is the median line of the positioning part, and the second median line is the median line of the distance between two adjacent positioning parts.

[0010] Optionally, the positioning part is a clamping surface. The clamping surface is arranged on the outer periphery of the connecting section and is located at one end of the milling blade away from the first end face. The area of the first end face is larger than that of the second end face. The cutting edge width of the first cutting edge band corresponding to the first median line of the clamping surface is the minimum value of the cutting edge width of the first cutting edge band. The cutting edge width of the first cutting edge band corresponding to the distance between two clamping surfaces is the maximum value of the cutting edge width of the first cutting edge band.

[0011] Optionally, a plurality of clamping surfaces are sequentially connected to each other to form a connecting line. The cutting edge width of the first cutting edge band corresponding to the connecting line is the maximum value of the cutting edge width of the first cutting edge band.

[0012] Optionally, the positioning part is a positioning post. The positioning post is arranged on the first end face. The cutting edge width of the first cutting edge band corresponding to the first median line of the positioning post is the minimum value of the cutting edge width of the first cutting edge band. The cutting edge width of the first cutting edge band corresponding to the second median line of the distance between two adjacent positioning posts is the maximum value of the cutting edge width of the first cutting edge band.

[0013] Optionally, the positioning post is arranged on the second end face, and the positioning post arranged on the first end face and the positioning post arranged on the second end face are coaxially arranged.

[0014] Optionally, the surface of the first end face is arranged in a wavy shape.

[0015] Optionally, the first cutting edge band corresponding to the first median line of the positioning part and the first cutting edge band corresponding to the second median line between two adjacent positioning parts are smoothly and transitionally connected.

[0016] Optionally, a second cutting edge band is formed at the connection between the second end face and the connecting section. The cutting edge width of the second cutting edge band corresponding to the first median line is the minimum value of the cutting edge width of the second cutting edge band. The cutting edge width of the second cutting edge band corresponding to the second median line is the maximum value of the cutting edge width of the second cutting edge band.

[0017] Optionally, a through hole is formed in the first end face, and the through hole penetrates through the connecting section to the second end face. The connecting part of the cutter head passes through the through hole and is connected to each positioning part.

[0018] According to a second aspect of the present invention, an embodiment of the present invention provides a method for determining the edge width of a blade, which is applied to a milling insert as described in any one of the first aspects.

[0019] Obtain the first principal cutting edge angle of the first median line, the second principal cutting edge angle of the second median line, and the feed rate of the milling insert in the milling insert; calculate the minimum edge width and the maximum edge width by the following formula:

[0020] W = K × L × sinα

[0021] Wherein, W is the edge width, K is a preset value, L is the feed rate, and α is the first principal cutting edge angle or the second principal cutting edge angle.

[0022] The technical solution provided by the embodiment of the present invention at least brings the following beneficial effects:

[0023] The embodiment of the present invention provides a milling insert and a method for determining the edge width of the milling insert. The milling insert includes: a connecting section and a first end face and a second end face respectively located at both ends of the connecting section. Both the first end face and the second end face are circular. The outer periphery of the first end face is inclined towards the second end face with the center of the first end face as the center, so that a first cutting edge band is formed at the connection between the first end face and the connecting section; the milling insert is provided with a plurality of positioning parts, and the connecting part of the tool holder is connected to each positioning part, and the plurality of positioning parts are arranged around the connecting part; the edge width of the first cutting edge band corresponding to the first median line is the minimum edge width of the first cutting edge band, and the edge width of the first cutting edge band corresponding to the second median line is the maximum edge width of the first cutting edge band. The first median line is the median line of the positioning part, and the second median line is the median line of the distance between two adjacent positioning parts. Based on this, when the circular milling insert processes a workpiece, it can be better adapted to the rotational processing of the milling insert during the processing. Through the design of the variable first cutting edge band width, the first cutting edge band becomes stronger at the large-force part and sharper at the low-force part, thereby further improving the processing performance of the milling insert.

[0024] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings here are incorporated into the specification and constitute a part of this specification, showing embodiments consistent with the present invention, and are used together with the specification to explain the principles of the present invention and do not constitute an improper limitation of the present invention.

[0026] Figure 1 is a schematic structural diagram of a milling insert shown according to an exemplary embodiment;

[0027] Figure 2 is another schematic structural diagram of a milling insert shown according to an exemplary embodiment;

[0028] Figure 3 It is another structural schematic diagram of a milling insert shown according to an exemplary embodiment.

[0029] Legend description:

[0030] Legend Name Legend Name 1 Milling insert 10 First end face 11 First land 12 Through hole 20 Second end face 21 Second land 30 Connection section 40 Positioning part 41 Clamping surface 42 Positioning post Detailed implementation manners

[0031] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. are based on the orientation or positional relationships shown in the drawings, and are 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 thus should not be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the number of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality" means two or more, unless otherwise specifically defined.

[0032] In the present invention, unless otherwise clearly defined and limited, the terms such as "mounted", "connected", "connected to", "fixed" and the like should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or a communication; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0033] In the present invention, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention.

[0034] In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiments or examples. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. Many specific details are set forth in the following description to facilitate a full understanding of the present disclosure, but the present disclosure may also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only a part of the embodiments of the present disclosure, rather than all the embodiments.

[0035] In order to be able to more clearly understand the above objects, features, and advantages of the present disclosure, the solutions of the present disclosure will be further described below. It should be noted that, without conflict, the embodiments of the present disclosure and the features in the embodiments may be combined with each other.

[0036] Based on this, the present invention provides a milling insert and a method for determining the edge width of the milling insert. First, the milling insert provided by the embodiments of the present invention will be introduced below.

[0037] As Figure 1-3 shown;

[0038] Embodiment 1;

[0039] The milling insert 1 may include:

[0040] A connecting section 30 and a first end face 10 and a second end face 20 respectively located at both ends of the connecting section 30. The first end face 10 and the second end face 20 are both circular. The outer periphery of the first end face 10 is inclined towards the second end face 20 with the center of the first end face 10 as the center, so that a first edge band 11 is formed at the connection between the first end face 10 and the connecting section 30;

[0041] The milling insert 1 is provided with a plurality of positioning portions 40. The connecting portion of the cutter head is connected to each positioning portion 40, and the plurality of positioning portions 40 are arranged around the connecting portion;

[0042] The edge width of the first edge band 11 corresponding to the first median line is the minimum value of the edge width of the first edge band 11, and the edge width of the first edge band 11 corresponding to the second median line is the maximum value of the edge width of the first edge band 11. The first median line is the median line of the positioning portion 40, and the second median line is the median line of the distance between two adjacent positioning portions 40.

[0043] In the above example, the milling insert 1 consists of one milling insert 1, which includes a first end face 10 and a second end face 20 arranged oppositely. Among them, both the first end face 10 and the second end face 20 are circular. The connecting section 30 connects the first end face 10 and the second end face 20. By inclining the center of the first end face 10 towards the second end face 20, a first land 11 can be formed between the outer periphery of the first end face 10 and the connecting section 30. On the milling insert 1 of the milling insert 1, a plurality of positioning parts 40 are provided. The connecting part of the milling cutter head is connected with the positioning part 40 of the milling insert 1, so that the cutter head and the milling insert 1 are positioned. Since both the first end face 10 and the second end face 20 of the milling insert 1 are circular, in order to improve the positioning accuracy between the positioning part 40 and the cutter head, the positioning part 40 can be arranged around the connecting part of the cutter head. Specifically, the positioning part 40 can be arranged on any one of the structures such as the first end face 10, the second end face 20, and the milling insert 1. The midline of the positioning part 40 is the first midline, and the midline of the distance between two adjacent positioning parts 40 is the second midline. The cutting edge width at the intersection of the first midline and the first land 11 is set as the minimum cutting edge width of the entire first land 11, and the cutting edge width at the intersection of the second midline and the first land 11 is set as the maximum cutting edge width of the entire first land 11.

[0044] In this example, the milling insert 1 is positioned and connected with the cutter head through the positioning part 40. When the milling insert 1 processes the workpiece, the first land 11 corresponding to the positioning part 40 is the lowest point during the cutting process, and the cutting edge trajectory of the circular milling insert 1 is an arc. When the milling insert 1 rotates to the lowest point, the included angle between the instantaneous movement direction of the first land 11 and the workpiece surface approaches zero (tangential contact). At this time, the cutting thickness (the theoretical thickness of the chip) of the milling insert 1 reaches the minimum value, even approaching zero. This is because at the lowest point, the cutting direction of the cutting edge is almost parallel to the workpiece surface, resulting in the chip being "scraped" rather than effectively sheared. Therefore, the cutting edge width of the first land 11 corresponding to the first midline of the positioning part 40 is set as the minimum cutting edge width of the entire first land 11, and the cutting edge width of the first land 11 of the adjacent positioning parts 40 is set as the maximum cutting edge width of the entire first land 11. Thus, when the circular milling insert 1 processes the workpiece, it can better adapt to the rotational processing of the milling insert 1 during the processing. Through the design of the varying width of the first land 11, the first land 11 becomes stronger at the large-force part and sharper at the low-force part, thereby further improving the processing performance of the milling insert 1.

[0045] Optionally, in one example, the positioning portion 40 is a clamping surface 41. The clamping surface 41 is disposed on the outer periphery of the connecting section 30, and the clamping surface 41 is located at one end of the milling blade 1 away from the first end face 10. The area of the first end face 10 is larger than the area of the second end face 20. The blade width of the first land 11 corresponding to the first median line of the clamping surface 41 is the minimum value of the blade width of the first land 11, and the blade width of the first land 11 corresponding to the distance between the two clamping surfaces 41 is the maximum value of the blade width of the first land 11.

[0046] In the above example, the area of the first end face 10 is larger than the area of the second end face 20, so that the connecting section 30 is in the shape of a frustum of a cone. The positioning portion 40 is located at one end away from the first end face 10, that is, at the small end of the frustum-shaped connecting section 30. Therefore, the positioning portion 40 can be a clamping surface 41, and a plurality of clamping surfaces 41 are annularly disposed on the outer periphery of the connecting section 30, thereby increasing the contact area between the cutter head and the milling blade 1 and improving the installation effect of the milling blade 1 and the cutter head.

[0047] When the positioning portion 40 is the clamping surface 41, the blade width of the first land 11 corresponding to the first median line of the clamping surface 41 is the minimum value of the blade width of the entire first land 11, and the blade width of the first land 11 corresponding to the distance between the two clamping surfaces 41 is the maximum value of the blade width of the entire first land 11.

[0048] Optionally, in one example, a plurality of clamping surfaces 41 are sequentially connected to each other to form a connecting line, and the blade width of the first land 11 corresponding to the connecting line is the maximum value of the blade width of the first land 11.

[0049] In the above example, by sequentially connecting a plurality of clamping surfaces 41 to each other, the area of the clamping surface 41 is further enlarged, the contact area between the cutter head and the milling blade 1 is further increased, and the installation effect of the milling blade 1 and the cutter head is improved.

[0050] Optionally, in one example, the positioning portion 40 is a positioning post 42. The positioning post 42 is disposed on the first end face 10. The blade width of the first land 11 corresponding to the first median line of the positioning post 42 is the minimum value of the blade width of the first land 11, and the blade width of the first land 11 corresponding to the second median line of the distance between two adjacent positioning posts 42 is the maximum value of the blade width of the first land 11.

[0051] In the above example, the positioning portion 40 is set as the positioning post 42. By engaging and cooperating the positioning post 42 with the positioning hole provided on the cutter head, the installation stability of the milling blade 1 and the cutter head can be better improved, and further the installation effect of the milling blade 1 and the cutter head is improved.

[0052] Thus, the blade width of the first land 11 corresponding to the first median line of the positioning post 42 is the minimum value of the blade width of the entire land; while the blade width of the first land 11 corresponding to the second median line of the distance between two adjacent positioning posts 42 is the maximum value of the blade width of the entire land.

[0053] Optionally, in an example, the positioning posts 42 are arranged on the second end face 20, and the positioning posts 42 arranged on the first end face 10 and the positioning posts 42 arranged on the second end face 20 are coaxially arranged.

[0054] In the above example, further, positioning posts 42 are also arranged on the second end face 20, and the positioning posts 42 on the first end face 10 and the positioning posts 42 on the second end face 20 are coaxially arranged with each other, so that positioning posts 42 are arranged on both the first end face 10 and the second end face 20 of the milling insert 1, thereby better improving the installation stability between the milling insert 1 and the cutter head, and further improving the installation effect of the milling insert 1 and the cutter head.

[0055] Embodiment 2:

[0056] Optionally, in an example, the surface of the first end face 10 is arranged in a wavy shape.

[0057] In the above example, the geometric shape of the wavy surface is essentially a "bending rib", similar to the compressive principle of corrugated cardboard. The undulation of the corrugations increases the effective moment of inertia (section modulus in bending) of the side surface, thereby enhancing the lateral bending and torsional resistance of the milling insert 1, and making the milling cutter more impact-resistant.

[0058] Optionally, in an example, the first land 11 corresponding to the first median line of the positioning portion 40 and the first land 11 corresponding to the second median line between two adjacent positioning portions 40 are smoothly transitionally connected.

[0059] In the above example, by smoothly transitionally connecting the first land 11 and the second land 21, and arranging a plurality of positioning portions 40 evenly along the circumferential direction of the milling insert 1, it is ensured that the force on the land transition region corresponding to each positioning portion 40 is balanced. The smooth transition avoids the cutting force fluctuation caused by geometric mutation, and the gradual change structure can disperse the impact energy and avoid the chipping caused by local overload.

[0060] Optionally, in an example, a second land 21 is formed at the connection between the second end face 20 and the connecting section 30. The blade width of the second land 21 corresponding to the first median line is the minimum value of the blade width of the second land 21, and the blade width of the second land 21 corresponding to the second median line is the maximum value of the blade width of the second land 21.

[0061] In the above example, by forming a second cutting edge band 21 at the connection between the second end face 20 and the connecting section 30, the milling insert 1 is formed with cutting edges on both the first end face 10 and the second end face 20, which can cut the workpiece, thereby improving the cutting effect of the milling insert 1.

[0062] Optionally, in one example, a through hole 12 is provided on the first end face 10, and the through hole 12 penetrates through the connecting section 30 to the second end face 20. The connecting portion of the tool disc passes through the through hole 12 and is connected to each positioning portion 40.

[0063] In the above example, by providing a through hole 12 on the first end face 10 and making the through hole 12 penetrate through the connecting section 30 to the second end face 20, the connecting portion of the tool disc can pass through the through hole 12 and be fixed to the connecting section 30, and is positioned and connected by the positioning portion 40, thereby further improving the connection stability between the tool disc and the milling insert 1.

[0064] In Embodiment 2, all the processes of Embodiment 1 can be realized and the same technical effects can be achieved. To avoid repetition, they will not be elaborated here.

[0065] Next, the method for determining the cutting edge width of the milling insert provided by the embodiments of the present invention will be introduced.

[0066] Embodiment 3:

[0067] In one example, the method for determining the cutting edge width of the milling insert may include:

[0068] W = K × L × sinα

[0069] Wherein, W is the cutting edge width, K is a preset value, L is the feed rate, and α is the first principal cutting edge angle or the second principal cutting edge angle.

[0070] In the above S101, since the milling insert is positioned when installed on the tool disc through the positioning portion, each time the milling insert contacts the workpiece, it contacts the workpiece at the same position, and its principal cutting edge angle can be determined. Therefore, the principal cutting edge angle of the positioning portion of the milling insert in the numerical control lathe can be determined through the design drawing of the milling insert or by sensing with a sensor in the numerical control lathe.

[0071] According to the workpiece material (such as steel, aluminum, titanium alloy) and the machining type (rough machining, finish machining), select the recommended feed rate of the milling insert from the cutting manual or database; alternatively, the actual feed rate of the milling insert during the machining process can also be deduced by the servo motor current or force sensor of the numerical control machine tool.

[0072] In the above S102, K is a fixed value used to compensate for the influence of factors such as tool wear and material elastic deformation in actual cutting on the edge width. The staff can make a setting according to the material of the workpiece or the material of the milling insert. After determining K, it is calculated through the following formula 1, so as to determine the edge width of the first land at this place. The edge width calculated according to the main cutting edge angle of the positioning part is the edge width corresponding to the first center line, that is, the minimum value of the edge width of the first land.

[0073] Edge width = K × Feed rate × sin Main cutting edge angle (Formula 1)

[0074] Furthermore, the main cutting edge angle corresponding to the second center line between the two positioning parts can also be obtained. The feed rate of the insert is constant. Therefore, the feed rate corresponding to the second center line is the same as the feed rate corresponding to the positioning part. According to the main cutting edge angle and feed rate corresponding to the second center line, the edge width corresponding to the second center line can be obtained according to the above formula 1. After determining the maximum value (the edge width corresponding to the second center line) and the minimum value (the edge width corresponding to the first center line of the positioning part) of the edge width of the first land, the edge width of the first land gradually changes from the maximum value of the edge width to the minimum value of the edge width.

[0075] The above is only the specific implementation manner of the present invention. Those skilled in the art can clearly understand that for the convenience and simplicity of description, the specific working processes of the above-described systems, modules, and units can refer to the corresponding processes in the foregoing method embodiments and will not be described herein again. It should be understood that the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of various equivalent modifications or substitutions, and these modifications or substitutions should be covered within the protection scope of the present invention.

Claims

1. A milling insert, characterized in that: The milling blade comprises: A connecting section and a first end face and a second end face respectively located at two ends of the connecting section, the first end face and the second end face are both circular, and the outer periphery of the first end face is inclined toward the second end face with the center of the first end face as the center, so that a first edge band is formed at the connection between the first end face and the connecting section; The milling blade is provided with a plurality of positioning parts, the connecting part of the cutter disc is connected to each of the positioning parts, and the plurality of positioning parts are arranged around the connecting part; The blade width of the first blade band corresponding to the first center line is the minimum blade width of the first blade band, and the blade width of the first blade band corresponding to the second center line is the maximum blade width of the first blade band. The first center line is the center line of the positioning portion, and the second center line is the center line of the interval between two adjacent positioning portions.

2. The milling insert according to claim 1, characterized in that The positioning portion is a clamping surface, which is arranged on the outer periphery of the connecting section and is located at an end of the milling cutter away from the first end face. The area of ​​the first end face is larger than the area of ​​the second end face. The blade width of the first blade band corresponding to the first center line of the clamping surface is the minimum blade width of the first blade band, and the blade width of the first blade band corresponding to the spacing between the two clamping surfaces is the maximum blade width of the first blade band.

3. The milling insert according to claim 2, characterized in that: The plurality of clamping surfaces are sequentially connected to each other to form a connecting line, and the blade width of the first blade band corresponding to the connecting line is the maximum blade width of the first blade band.

4. The milling insert according to claim 1, characterized in that The positioning portion is a positioning column, and the positioning column is arranged on the first end face. The blade width of the first blade band corresponding to the first center line of the positioning column is the minimum blade width of the first blade band, and the blade width of the first blade band corresponding to the second center line of the interval between two adjacent positioning columns is the maximum blade width of the first blade band.

5. The milling insert according to claim 4, characterized in that The positioning column is arranged on the second end surface, and the positioning column arranged on the first end surface and the positioning column arranged on the second end surface are arranged coaxially.

6. The milling insert according to any one of claims 1 to 5, characterized in that The surface of the first end surface is arranged in a wave shape.

7. The milling insert according to any one of claims 1 to 5, characterized in that The first edge band corresponding to the first center line of the positioning portion and the first edge band corresponding to the second center line between two adjacent positioning portions are smoothly transitionally connected.

8. The milling insert according to any one of claims 1 to 5, characterized in that A second edge band is formed at the connection between the second end surface and the connecting section, the edge width of the second edge band corresponding to the first center line is the minimum edge width of the second edge band, and the edge width of the second edge band corresponding to the second center line is the maximum edge width of the second edge band.

9. The milling insert according to any one of claims 1 to 5, characterized in that The first end surface is provided with a through hole, the through hole passes through the connecting section to the second end surface, and the connecting portion of the cutter disc passes through the through hole and is connected to each of the positioning portions.

10. A method for determining the blade width of a milling insert, characterized in that: The method is applied to the milling insert according to claims 1-9, and the method comprises: Obtaining a first main deflection angle of the first center line of the milling cutter, a second main deflection angle of the second center line, and a feed rate of the milling cutter; The minimum blade width and the maximum blade width are obtained by calculating the following formula: W=K×L×sinα Wherein, W is the blade width, K is a preset value, L is the feed amount, and α is the first main deflection angle or the second main deflection angle.

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