Milling blade and milling tool

Abstract

The present invention discloses a milling insert and a milling tool, wherein the milling insert is used in conjunction with a cutter body having an anti-rotation limiting protrusion. The milling insert includes a blade body for milling a workpiece, the blade body having a mounting hole formed axially through it for a screw to pass through; the blade body is provided with at least one anti-rotation groove on one side thereof axially close to the cutter body, the anti-rotation groove including a positive locking surface and a negative locking surface connected to each other; the positive locking surface is provided as an arc-shaped surface that tends to gradually approach the center of a circle along the circumferential direction, and the negative locking surface is provided as an arc-shaped surface that tends to gradually move away from the center of a circle along the circumferential direction; when installed and used, the limiting protrusion is located at the connection between the positive locking surface and the negative locking surface. The present invention can limit the rotation of the blade body relative to the cutter body, thereby extending the service life of the milling insert.

Description

Technical Field

[0001] The present invention relates to the technical field of cutting tools, and in particular to a milling blade and a milling tool with an anti-rotation function. Background Art

[0002] like Figure 1 As shown, traditional milling tools usually rely on the fastening force of screws 3 to fit and fix the circular blade (also called milling blade 1) on the cutter body 2. This traditional installation method lacks an anti-rotation structure and mainly relies on the locking effect of the screws 3 to prevent rotation. As a result, under harsh processing conditions, the milling blade 1 is prone to rotation beyond the allowed indicators on the cutter body 2, further resulting in a decrease in the surface quality of the workpiece being processed, affecting the service life of the milling blade 1 and the milling tool. Summary of the Invention

[0003] Therefore, the technical problem to be solved by the present invention is to overcome the defect that the milling tool in the prior art lacks an anti-rotation structure, which leads to the milling blade easily rotating on the cutter body beyond the allowed indicators under harsh processing conditions, affecting the service life of the milling blade and the milling tool, thereby providing a milling blade and milling tool.

[0004] According to a first aspect of the present invention, a milling insert is provided, which is used in conjunction with a cutter body having an anti-rotation limiting protrusion, and the milling insert comprises:

[0005] The blade body is used for milling a workpiece, and a mounting hole is formed through the blade body in the axial direction, and the mounting hole is used for a screw to pass through;

[0006] There is at least one anti-rotation groove, which is arranged on the side of the blade body close to the blade body in the axial direction, and each anti-rotation groove includes a positive locking surface and a reverse locking surface connected to each other;

[0007] The positive locking surface is set as an arc-shaped surface that tends to be distributed along the circumference gradually approaching the center of the circle, and the reverse locking surface is set as an arc-shaped surface that tends to be distributed along the circumference gradually away from the center of the circle; when installed and used, the limiting protrusion is located at the connection between the positive locking surface and the reverse locking surface.

[0008] According to the present invention, a milling insert has at least the following technical effects: 1. By arranging an anti-rotation groove on one side of the insert body axially close to the cutter body, after the milling insert is assembled on the cutter body with a limiting protrusion by screws, the limiting protrusion is located between the positive locking surface and the reverse locking surface; when the insert body rotates relative to the cutter body, the positive locking surface or the reverse locking surface will abut against the outer peripheral surface of the limiting protrusion, thereby limiting the rotation of the insert body relative to the cutter body. Even under harsh machining conditions, the milling insert will not rotate relative to the cutter body beyond the permitted specifications, thereby extending the service life of the milling insert. 2. By setting the positive locking surface as an arc-shaped surface that gradually approaches the center of a circle along the circumference and setting the reverse locking surface as an arc-shaped surface that gradually moves away from the center of a circle along the circumference, the contact area between the positive locking surface and the reverse locking surface and the outer peripheral surface of the limiting protrusion during the limiting rotation process is further increased, thereby better limiting the rotation of the insert body relative to the cutter body.

[0009] Preferably, a plurality of anti-rotation grooves are provided, and the plurality of anti-rotation grooves are arranged circumferentially at intervals on the side of the blade body axially close to the blade body; the diameter of the mounting hole is larger than the size of the screw, and the axis of the mounting hole and the axis of the screw assembly are radially offset.

[0010] Preferably, the graph of the positive positioning surface projected axially onto the side of the blade body axially close to the cutter body is a first power function curve; the graph of the negative positioning surface projected axially onto the side of the blade body axially close to the cutter body is a second power function curve.

[0011] Preferably, the power function formulas of the first power function curve and the second power function curve are both set to

[0012] Preferably, the connection between the positive locking surface and the reverse locking surface is configured as an arc transition or a chamfered transition; and / or, six anti-rotation grooves are provided.

[0013] Preferably, the anti-rotation groove further includes an upper surface connecting the positive locking surface and the reverse locking surface, and when installed and used, the upper surface abuts against the limiting protrusion along the axial direction.

[0014] According to a second aspect of the present invention, a milling tool is provided, comprising:

[0015] A cutter body, with a plurality of mounting seats arranged at intervals along the circumference of the cutter body, wherein the mounting seats are formed with first threaded holes along the thickness direction thereof, and a limiting protrusion for preventing rotation is provided at an eccentric position along the thickness direction thereof on one side of the mounting seats;

[0016] A plurality of milling blades are correspondingly arranged on the mounting seat by means of screws cooperating with the first threaded holes. The milling blades are the milling blades provided by the first aspect above.

[0017] A milling tool according to the present invention has at least the following technical effects:

[0018] 1. An anti-rotation groove is arranged on one side of the blade body close to the cutter body along the axial direction. After the milling blade and the cutter body are assembled into one body to form a milling tool by matching the screw and the first threaded hole, the limiting protrusion is located at the spatial position of the connection between the positive locking surface and the reverse locking surface; when the milling blade rotates relative to the cutter body, the positive locking surface or the reverse locking surface will abut against the outer peripheral surface of the limiting protrusion, thereby limiting the rotation of the milling blade relative to the cutter body, so that even under harsh processing conditions, the milling blade will not rotate relative to the cutter body beyond the allowed indicators, thereby extending the service life of the milling blade and the milling tool.

[0019] 2. By setting the positive locking surface as an arc-shaped surface that tends to gradually approach the center of the circle along the circumference and setting the reverse locking surface as an arc-shaped surface that tends to gradually move away from the center of the circle along the circumference, the contact area between the positive locking surface and the reverse locking surface and the outer peripheral surface of the limiting protrusion is further increased during the process of limiting the rotation, thereby better limiting the rotation of the milling blade relative to the cutter body.

[0020] Preferably, a plurality of anti-rotation grooves are provided, and the plurality of anti-rotation grooves are arranged circumferentially at intervals on the side of the blade body axially close to the knife body; the diameter of the mounting hole is larger than the size of the screw, and the radial distance between the screw assembly axis and the limiting protrusion axis is smaller than the radial distance between the milling blade axis and the limiting protrusion axis.

[0021] Preferably, the limiting protrusion is detachably arranged on the mounting seat.

[0022] Preferably, a threaded portion is provided on one end of the limiting protrusion facing the mounting seat; a second threaded hole is formed along the thickness direction of the mounting seat at an eccentric position on the side of the mounting seat facing the milling blade, and the second threaded hole matches the threaded portion.

[0023] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0025] Figure 1 A schematic diagram of the three-dimensional structure of an existing milling tool;

[0026] Figure 2 A schematic diagram of the three-dimensional structure of a milling insert according to an embodiment of the present invention;

[0027] Figure 3 for Figure 2 Schematic diagram of the right view structure;

[0028] Figure 4 for Figure 3 A magnified schematic diagram of point A in the middle;

[0029] Figure 5 is a schematic diagram of the three-dimensional structure of the milling insert according to an embodiment of the present invention from another angle;

[0030] Figure 6 A schematic diagram of the three-dimensional structure of a milling tool according to an embodiment of the present invention;

[0031] Figure 7 A schematic diagram of a partially cutaway three-dimensional structure of a milling tool according to an embodiment of the present invention, viewed from another angle;

[0032] Figure 8 for Figure 7 A magnified schematic diagram of point B in the middle;

[0033] Figure 9 Schematic diagram of the structure of the limiting protrusion in an embodiment of the present invention.

[0034] Description of reference numerals:

[0035] 1- milling blade, 11- blade body, 111- mounting hole, 12- anti-rotation groove, 121- positive locking surface, 122- reverse locking surface, 123- upper surface;

[0036] 2- blade body, 21- limiting protrusion, 211- threaded portion, 22- mounting seat, 221- first threaded hole, 222- second threaded hole;

[0037] 3- screws;

[0038] A1-mounting hole axis, A2-screw assembly axis, A3-limiting protrusion axis;

[0039] L1-first power function curve, L2-second power function curve. DETAILED DESCRIPTION

[0040] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0041] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0042] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0043] In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0044] Example 1

[0045] like Figures 2 to 4 The figure shows a milling insert provided by this embodiment, which is used in conjunction with a cutter body 2 having an anti-rotation limiting protrusion 21. The assembly diagram of the milling insert 1 and the cutter body 2 is shown in FIG. Figure 6 and Figure 7As shown, the milling blade 1 includes a blade body 11 for milling a workpiece, and the blade body 11 is axially penetrated with a mounting hole 111 for the screw 3 to pass through; the blade body 11 is axially provided with at least one anti-rotation groove 12 on one side close to the cutter body 2, and each of the anti-rotation grooves 12 includes a positive positioning surface 121 and a reverse positioning surface 122 connected to each other; the positive positioning surface 121 is set as an arcuate surface with a tendency to gradually approach the center of the circle along the circumferential direction, and the reverse positioning surface 122 is set as an arcuate surface with a tendency to gradually move away from the center of the circle along the circumferential direction; when assembled and used, the limiting protrusion 21 is located at the connection between the positive positioning surface 121 and the reverse positioning surface 122. It can be understood that the axial direction described in the embodiment of the present invention refers to Figure 2 The axial direction shown in the embodiment of the present invention refers to the circumferential direction. Figure 2 The circumferential direction of the blade body 11 in the viewing angle.

[0046] Compared with the prior art, the embodiment of the present invention arranges at least one anti-rotation groove 12 on one side of the blade body 11 axially close to the cutter body 2. After the milling blade 1 is assembled on the cutter body 2 with the limiting protrusion 21 by the screw 3, the limiting protrusion 21 is located between the positive locking surface 121 and the reverse locking surface 122; when the blade body 11 rotates relative to the cutter body 2, the positive locking surface 121 or the reverse locking surface 122 will abut against the outer peripheral surface of the limiting protrusion 21, thereby limiting the rotation of the blade body 11 relative to the cutter body 2, so that even under harsh processing conditions, the milling blade 1 will not rotate relative to the cutter body 2 beyond the allowed indicators, thereby extending the service life of the milling blade 1. At the same time, by setting the positive locking surface 121 to an arcuate surface that tends to gradually approach the center of the circle along the circumferential direction and setting the reverse locking surface 122 to an arcuate surface that tends to gradually move away from the center of the circle along the circumferential direction, the contact area between the positive locking surface 121 and the reverse locking surface 122 and the outer peripheral surface of the limiting protrusion 21 is further increased during the process of limiting the rotation, thereby better limiting the rotation of the blade body 11 relative to the blade body 2.

[0047] Specifically, in order to further increase the contact area between the positive locking surface 121 and the reverse locking surface 122 and the outer peripheral surface of the limiting protrusion 21 during the process of limiting the rotation, and to better limit the rotation of the blade body 11 relative to the blade body 2, the limiting protrusion 21 is configured as a cylindrical protrusion. Of course, this is only a preferred structural shape of the limiting protrusion 21 and does not limit its structural shape. In other embodiments, the limiting protrusion 21 can also be a protrusion of other structural shapes, for example, a protrusion projected along the axial direction into a triangle, a quadrilateral, or other polygon.

[0048] like Figure 3 and Figure 8As shown, as an improved embodiment of the present invention, in order to facilitate the use of the arc cutting edges at different positions of the blade body 11 for cutting after the rotating milling blade 1 is rotated, the anti-rotation function can still be maintained, and the effective cutting edges of the entire circumference of the blade body 11 can be fully utilized; at least two anti-rotation grooves 12 are provided to enable the blade body 11 to perform the rotation operation, and the number of the anti-rotation grooves 12 can be adaptively adjusted according to the type and size of the milling blade 1. In this embodiment, as shown in FIG. Figure 3 and Figure 5 As shown, the anti-rotation grooves 12 can be preferably provided with six, and the six anti-rotation grooves 12 are arranged at equal intervals along the circumferential direction on the side of the blade body 11 axially close to the cutter body 2. In order to facilitate the rotation of the milling blade 1 relative to the screw 3 after loosening the screw 3, the diameter of the mounting hole 111 is set to be larger than the size of the screw 3; at the same time, the axis A1 of the mounting hole and the axis A2 of the screw assembly are radially offset; in the process of rotating the milling blade 1 for rotation, as shown in FIG. Figure 8 As shown, it is only necessary to loosen the screw 3 to a smaller pitch. At this time, the distance between the axis A1 of the mounting hole and the axis A2 of the screw assembly increases. The blade body 11 is rotated to make the limiting protrusion 21 rotate relatively along the trajectory of the reverse locking surface 122. Under the action of the ejection force provided by the limiting protrusion 21, the limiting protrusion 21 of the blade body 11 will gradually separate from the original anti-rotation groove 12 along the trajectory of the reverse locking surface 122, and as the blade body 11 rotates, it is re-engaged in another adjacent anti-rotation groove 12, and then the screw 3 is tightened. At this time, the distance between the axis A1 of the mounting hole and the axis A2 of the screw assembly is reduced and enters a locked state, that is, the screw 3 forms a pressure on the side wall of the mounting hole 111 toward the limiting protrusion 21, and the limiting protrusion 21 also has a reaction force on the reverse locking surface 122 and the positive locking surface 121. The three are in a mutually squeezing relationship, thereby realizing the anti-rotation function. Compared with the traditional milling blade 1 indexing, which requires the complete disassembly of the screw 3 and the circular blade, this embodiment can achieve the indexing operation of the milling blade 1 by only rotating the screw 3 through a smaller pitch and using less force, which is convenient and efficient. It can be understood that the radial direction described in the embodiment of the present invention refers to Figure 3 The diameter direction of the mounting hole 111 in the viewing angle.

[0049] Specifically, when the milling blade 1 and the cutter body 2 are in a locked state, a gap is maintained between the positive locking surface 121 and the reverse locking surface 122 and the limiting protrusion 21, and the size of the gap is within the index range of allowable rotation. On the one hand, it is convenient for assembly and use. On the other hand, because the axis A1 of the mounting hole and the axis A2 of the screw assembly are radially offset, the eccentric force generated during the milling process drives the blade body 11 to rotate a certain angle so that the positive locking surface 121 or the reverse locking surface 122 abuts and cooperates with the limiting protrusion 21, thereby preventing the blade from rotating.

[0050] Specifically, the milling insert 1 can be configured as a circular insert, i.e., the cutting edge of the insert body 11 is a continuous arc cutting edge. Of course, this is merely a preference for the type of milling insert 1 and does not limit it. In other embodiments, the milling insert 1 can also be another type of insert, such as a milling insert that is axially projected as a triangle, quadrilateral, or other polygon. The surface of the insert body 11 can be deposited with a functional or decorative coating, such as a TiN coating, to improve the performance of the milling insert 1. At least a portion of the mounting hole 111 of the insert body 11 is designed to be slightly larger than the outer diameter of the screw thread 3, so that the insert body 11 can be rotated after the screw 3 has traveled a certain pitch, and the mounting hole 111 can have a portion designed to engage with the screw thread 3 to ensure the locking effect of the screw 3. In this embodiment, the portion of the mounting hole 111 near the anti-rotation groove 12 can be used to engage with the screw thread 3, and the size of the portion of the mounting hole 111 near the cutting edge can be slightly larger than the outer diameter of the screw thread 3.

[0051] like Figure 8 As shown, in some embodiments of the present invention, the positive locking surface 121 is radially projected onto the side of the blade body 11 axially close to the cutter body 2 as a first power function curve L1; the reverse locking surface 122 is radially projected onto the side of the blade body 11 axially close to the cutter body 2 as a second power function curve L2. Due to the characteristics of the power function, the intersection position between the first power function curve L1 and the second power function curve L2 is exactly the position closest to the axis A3 of the entire second power function curve L2 from the limiting protrusion, providing a locking space that better fits the limiting protrusion 21, with a better anti-rotation effect, and making it easier to rotate the milling blade 1 to complete the rotation operation using less force on the basis of loosening the screw 3 to pass a smaller pitch.

[0052] Specifically, the connection between the positive locking surface 121 and the reverse locking surface 122 is configured as an arc transition or a chamfered transition for ease of production and assembly.

[0053] Specifically, in order to facilitate maintaining the anti-rotation function when cutting using the arc cutting edges at different positions of the insert body 11 after the rotating milling insert 1 is repositioned, the anti-rotation grooves 12 are preferably six, and the six anti-rotation grooves 12 are arranged at intervals along the circumference on the side of the insert body 11 axially close to the cutter body 2. Of course, this is only a preferred number of anti-rotation grooves 12 and does not limit its specific number. In other embodiments, the number of anti-rotation grooves 12 can be set to three, five, or eight, etc.

[0054] like Figure 8 As shown, in some embodiments of the present invention, the power function formulas of the first power function curve L1 and the second power function curve L2 are both set to The characteristics of the power function are that the domain and range are both [0, +∞), and any curve of the power function can be used as the first power function curve L1 and the second power function curve L2. The power function is The curve provides a better fit for the positioning space of the limiting protrusion 21, and the anti-rotation effect is better, and the power function formula is The second power function curve L2 is more gentle. When the milling blade 1 is rotated to complete the indexing operation, it is only necessary to loosen the screw 3 to pass a smaller pitch. At this time, the distance between the axis A1 of the mounting hole and the axis A2 of the screw assembly increases. The blade body 11 is rotated with a smaller force. Under the action of the ejection force provided by the limiting protrusion 21, the limiting protrusion 21 will gradually and easily break away from the original anti-indexing groove 12 along the trajectory of the second power function curve L2 of the reverse locking surface 122, and as the blade body 11 is rotated, the limiting protrusion 21 will gradually break away from the original anti-indexing groove 12 along the trajectory of the second power function curve L2 of the reverse locking surface 122, and as the blade body 11 is rotated, the limiting protrusion 21 will gradually break away from the original anti-indexing groove 12. After rotating and re-engaging in another adjacent anti-rotation groove 12 along the first power function curve L1 of another adjacent anti-rotation groove 12, tighten the screw 3. At this time, the distance between the axis A1 of the mounting hole and the axis A2 of the screw assembly is reduced and enters a locked state, that is, the screw 3 forms a pressure on the side wall of the mounting hole 111 toward the limiting protrusion 21, and the limiting protrusion 21 also has a reaction force on the reverse locking surface 122 and the positive locking surface 121. The three are in a mutually squeezing relationship, thereby realizing the anti-rotation function.

[0055] like Figure 4 and Figure 5 As shown, in some embodiments of the present invention, the anti-rotation groove 12 further includes an upper surface 123 connecting the positive locking surface 121 and the reverse locking surface 122. When installed and used, the upper surface 123 axially abuts the limiting protrusion 21, and the upper surface 123 cooperates with the screw 3 to axially position and lock the blade body 11. Specifically, the connection between the upper surface 123 and the outer peripheral surface of the blade body 11 is a circular arc transition.

[0056] Example 2

[0057] like Figures 2 to 8 A milling tool provided in this embodiment is shown, comprising:

[0058] The blade body 2 has four mounting seats 22 arranged at intervals along the circumference of the blade body 2. The mounting seats 22 have first threaded holes 221 formed therethrough along the thickness direction of the mounting seats 22. A limiting protrusion 21 for preventing rotation is provided at an eccentric position on one side of the mounting seat 22 along the thickness direction of the mounting seat 22.

[0059] The milling insert 1 is correspondingly arranged on the mounting seat 22 by means of a screw 3 cooperating with the first threaded hole 221 . The milling insert 1 is the milling insert 1 described in the first embodiment.

[0060] In specific applications, the specific structure of the cutter body 2 can be adaptively adjusted according to the milling blade 1 and other processing conditions, and the number of mounting seats 22 on the cutter body 2 can also be reasonably increased or decreased. For example, the number of mounting seats 22 can be three, five, six or eight, etc.

[0061] It can be understood that the several described in this embodiment refers to one or more than one.

[0062] Compared with the prior art, the embodiment of the present invention arranges at least one anti-rotation groove 12 on one side of the blade body 11 axially close to the cutter body 2. After the screw 3 and the first threaded hole 221 are connected to assemble the milling blade 1 and the cutter body 2 into one body to form a milling tool, the limiting protrusion 21 is located at the spatial position of the connection between the positive locking surface 121 and the reverse locking surface 122; when the milling blade 1 rotates relative to the cutter body 2, the positive locking surface 121 or the reverse locking surface 122 will abut against the outer peripheral surface of the limiting protrusion 21, thereby limiting the rotation of the milling blade 1 relative to the cutter body 2, so that even under harsh processing conditions, the milling blade 1 will not rotate relative to the cutter body 2 beyond the allowed indicators, thereby extending the service life of the milling blade 1 and the milling tool. At the same time, by setting the positive locking surface 121 as an arc-shaped surface with a tendency to gradually approach the center of the circle along the circumferential direction and setting the reverse locking surface 122 as an arc-shaped surface with a tendency to gradually move away from the center of the circle along the circumferential direction, the contact area between the positive locking surface 121 and the reverse locking surface 122 and the outer peripheral surface of the limiting protrusion 21 is further increased during the process of limiting the indexing, thereby better limiting the rotation of the milling insert 1 relative to the cutter body 2. It can be understood that the thickness direction of the mounting seat 22 described in the embodiment of the present invention is parallel to the axial direction of the insert body 11.

[0063] like Figure 3 、 Figure 5 and Figure 8As shown, in some embodiments of the present invention, at least two anti-rotation grooves 12 are provided so that the blade body 11 can be rotated. The number of anti-rotation grooves 12 can be adaptively adjusted according to the type and size of the milling blade 1. In this embodiment, the anti-rotation grooves 12 can be preferably provided with six, and the six anti-rotation grooves 12 are arranged circumferentially at intervals on the side of the blade body 11 axially close to the cutter body 2; the diameter of the mounting hole 111 is larger than the size of the screw 3, and the radial distance between the screw assembly axis A2 and the limiting protrusion axis A3 is smaller than the radial distance between the milling blade axis and the limiting protrusion axis A3. Since the radial distance between the screw assembly axis A2 and the limiting protrusion axis A3 is smaller than the radial distance between the milling blade axis and the limiting protrusion axis A3, when the milling blade 1 needs to be rotated for rotation (that is, the milling blade 1 and the cutter body 2 need to be switched into a non-locking state), as shown in FIG. Figure 8 As shown, it is only necessary to loosen the screw 3 to move through a smaller pitch. At this time, the distance between the axis of the milling blade and the axis A3 of the limiting protrusion increases. Combined with the ejection force provided by the limiting protrusion 21, it is only necessary to use a smaller force to move the milling blade 1 clockwise, so that the milling blade 1 is axially projected along the reverse locking surface 122 on the side of the blade body 11 axially close to the cutter body 2 and rotates around the axis of the milling blade. The limiting protrusion 21 will gradually separate from the anti-rotation groove 1 in the original position along the trajectory of the reverse locking surface 122. 2, and as the blade body 11 rotates and re-engages into another adjacent anti-rotation groove 12, the screw 3 is tightened again. At this time, the distance between the axis of the milling blade and the screw assembly axis A2 is reduced, causing the milling blade 1 and the cutter body 2 to switch into a locked state, that is, the screw 3 forms a pressure on the side wall of the mounting hole 111 toward the limiting protrusion 21, and the limiting protrusion 21 also has a reaction force on the reverse locking surface 122 and the positive locking surface 121. The three are in a mutually squeezing relationship, thereby achieving the anti-rotation function. Compared with the traditional milling blade 1, which requires the complete disassembly of the screw 3 and the circular blade for rotation, this embodiment can achieve the rotation operation of the milling blade 1 with less force by only rotating the screw 3 through a smaller pitch, which is convenient and efficient. It can be understood that the axis of the milling blade and the axis A1 of the mounting hole refer to the same axis.

[0064] In some embodiments of the present invention, the limiting protrusion 21 is detachably mounted on the mounting seat 22. When it is not necessary to operate in a harsh working environment, the limiting protrusion 21 can be removed from the mounting seat 22 so that a conventional circular blade can be mounted on the mounting seat 22, thereby enabling conversion between conventional circular blades and anti-rotation milling inserts 1, with a wide range of applications. Specifically, in order to facilitate insertion into the anti-rotation groove 12, and out of consideration for the strength design of the milling insert 1 itself, combined with the effective anti-rotation limiting function of the limiting protrusion 21 on the milling insert 1, the dimension of the end of the limiting protrusion 21 that protrudes from the surface of the mounting seat 22 away from the mounting seat 22 is set to 0.6 mm to 1.0 mm.

[0065] like Figure 6 and Figure 9 As shown, specifically, the limiting protrusion 21 is provided with a threaded portion 211 at one end facing the mounting seat 22; a second threaded hole 222 is formed along the thickness direction of the mounting seat 22 at an eccentric position on the side of the mounting seat 22 facing the milling insert 1, and the second threaded hole 222 matches the threaded portion 211. The limiting protrusion 21 is detachably connected to the mounting seat 22 through the threaded connection between the threaded portion 211 and the second threaded hole 222. When the two are connected as one, the connection is compact and not easy to loosen, and the limiting protrusion 21 has an anti-rotation effect. When a conventional circular blade needs to be replaced for use, the limiting protrusion 21 only needs to be reversed and unscrewed from the second threaded hole 222, which is convenient to operate. Specifically, the limiting protrusion 21 is configured as a fastening screw 3. The limiting protrusion 21 is configured as a standard part, eliminating the need for special mold production as a non-standard part, further reducing manufacturing costs.

[0066] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A milling insert, characterized in that: The milling blade (1) is used in conjunction with a cutter body (2) having an anti-rotation limiting protrusion (21), and comprises: A blade body (11) is used for milling a workpiece, wherein the blade body (11) is formed with a mounting hole (111) extending through the blade body (111) in the axial direction, and the mounting hole (111) is used for a screw (3) to pass through. At least one anti-rotation groove (12) is provided and arranged on a side of the blade body (11) close to the blade body (2) in the axial direction, and each anti-rotation groove (12) includes a positive locking surface (121) and a reverse locking surface (122) connected to each other; The positive locking surface (121) is configured as an arc-shaped surface that gradually approaches the center of the circle along the circumferential direction, and the negative locking surface (122) is configured as an arc-shaped surface that gradually moves away from the center of the circle along the circumferential direction; when installed and used, the limiting protrusion (21) is located at the connection between the positive locking surface (121) and the negative locking surface (122); A plurality of anti-rotation grooves (12) are provided, and the plurality of anti-rotation grooves (12) are arranged at intervals along the circumference on a side of the blade body (11) axially close to the blade body (2); the diameter of the mounting hole (111) is larger than the size of the screw (3), and the axis (A1) of the mounting hole and the axis (A2) of the screw assembly are radially offset.

2. The milling insert according to claim 1, characterized in that: The graph of the positive locking surface (121) projected axially onto the side of the blade body (11) axially close to the blade body (2) is a first power function curve (L1); and the graph of the negative locking surface (122) projected axially onto the side of the blade body (11) axially close to the blade body (2) is a second power function curve (L2).

3. The milling insert according to claim 2, characterized in that: The power function formulas of the first power function curve (L1) and the second power function curve (L2) are both set to 4. The milling insert according to claim 1, characterized in that: The connection between the positive locking surface (121) and the reverse locking surface (122) is configured as an arc transition or a chamfered transition; and / or, six anti-rotation grooves (12) are provided.

5. The milling insert according to claim 1, characterized in that: The anti-rotation groove (12) further comprises an upper surface (123) connecting the positive locking surface (121) and the reverse locking surface (122); when installed and used, the upper surface (123) abuts against the limiting protrusion (21) along the axial direction.

6. A milling tool, characterized in that: include: A blade body (2), with a plurality of mounting seats (22) arranged at intervals along the circumference of the blade body (2), a first threaded hole (221) being formed through the mounting seat (22) along its thickness direction, and a limiting protrusion (21) for preventing rotation being provided at an eccentric position on one side of the mounting seat (22) along its thickness direction; A plurality of milling blades (1) are correspondingly arranged on the mounting seat (22) by means of screws (3) cooperating with the first threaded holes (221), and the milling blades (1) are the milling blades (1) according to any one of claims 1 to 5.

7. A milling tool according to claim 6, characterized in that: There are multiple anti-rotation grooves (12), and the multiple anti-rotation grooves (12) are arranged at intervals along the circumference on the side of the blade body (11) axially close to the knife body (2); the diameter of the mounting hole (111) is larger than the size of the screw (3), and the radial distance between the screw assembly axis (A2) and the limiting protrusion axis (A3) is smaller than the radial distance between the milling blade axis and the limiting protrusion axis (A3).

8. The milling tool according to claim 6, characterized in that: The limiting protrusion (21) is detachably arranged on the mounting seat (22).

9. The milling tool according to claim 8, characterized in that: A threaded portion (211) is provided on one end of the limiting protrusion (21) facing the mounting seat (22); a second threaded hole (222) is formed along the thickness direction of the mounting seat (22) at an eccentric position on one side of the mounting seat (22) facing the milling blade (1), and the second threaded hole (222) matches the threaded portion (211).

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