Cutting tool

Abstract

The cutting tool comprises a rotating body, a first cutting assembly and a second cutting assembly. The first cutting assembly comprises at least two first tool bits, the second cutting assembly comprises at least two second tool bits, and the first tool bits and the second tool bits are alternately distributed on the circumferential surface of the rotating body at equal intervals around the symmetry axis. The cutter width D1 of the first main cutting edge is larger than the cutter width D2 of the first auxiliary cutting edge. The deviation angle alpha 1 of the first main beveling blade is larger than the deviation angle alpha 2 of the first auxiliary beveling blade. The cutter width D3 of the second main cutting edge is larger than the cutter width D4 of the second auxiliary cutting edge. The deviation angle alpha 3 of the second main beveling edge is larger than the deviation angle alpha 4 of the second auxiliary beveling edge, D1 is equal to D3, and alpha 1 is equal to alpha 3. According to the cutter, D1 is larger than D2, and alpha 1 is larger than alpha 2, so that when the first cutter head and the second cutter head alternately conduct cutting machining on a workpiece, two cuttings with different widths can be generated, the widths of the two cuttings are smaller than the width of a milling groove formed by cutting, and therefore the situation that the cuttings remain in the milling groove is avoided.

Description

Technical Field

[0001] The present application relates to the technical field of workpiece cutting, and in particular to a cutting tool. Background Art

[0002] With the development of workpiece cutting technology, there has emerged a process of using an integrated slot milling tool to perform forming processing on the workpiece. However, it is common to have chips remaining in the slot during slot milling.

[0003] In the related art, generally, the chips in the groove are removed manually by operators in a timely manner, or a chip breaker groove is added to the cutting edge of the slot milling tool to break the chips.

[0004] However, the method of removing chips from the groove by operators in the related art is labor-intensive, and the design of adding chip breaker grooves will destroy the overall rigidity of the tool, resulting in reduced tool tip strength and poor wear resistance / breakage resistance. Therefore, the solution to improve the phenomenon of chips remaining in the groove in the above-mentioned related art is less effective. Summary of the invention

[0005] Based on this, it is necessary to provide a cutting tool to address the problem that the solution to improve the phenomenon of chips remaining in the groove in the related art is less effective.

[0006] A cutting tool, comprising:

[0007] A swivel, the swivel having an axis of symmetry and an axis of symmetry;

[0008] A first cutting assembly, wherein the first cutting assembly comprises at least two first cutting heads, wherein the cutting edge of the first cutting head is divided into a first main cutting edge and a first secondary cutting edge along the symmetry axis plane, wherein the widths of the first main cutting edge and the first secondary cutting edge relative to the symmetry axis plane are D1 and D2 respectively, wherein the first main cutting edge and the first secondary cutting edge respectively comprise a first main bevel cutting edge and a first secondary bevel cutting edge near the cutting tip, wherein the deviation angles of the first main bevel cutting edge and the first secondary bevel cutting edge relative to the symmetry axis plane are α1 and α2 respectively;

[0009] A second cutting assembly, wherein the second cutting assembly comprises at least two second cutting heads, wherein the cutting edge of the second cutting head is divided into a second main cutting edge and a second secondary cutting edge along the symmetry axis plane, wherein the widths of the second main cutting edge and the second secondary cutting edge relative to the symmetry axis plane are D3 and D4 respectively, wherein the second main cutting edge and the second secondary cutting edge respectively comprise a second main bevel cutting edge and a second secondary bevel cutting edge near the cutting tip, wherein the deviation angles of the second main bevel cutting edge and the second secondary bevel cutting edge relative to the symmetry axis plane are α3 and α4 respectively;

[0010] The first cutter head and the second cutter head are alternately and evenly distributed on the circumferential surface of the rotator around the axis of symmetry, and the first main cutting edge and the second main cutting edge are respectively located on both sides of the axis of symmetry, wherein D1 is greater than D2, D3 is greater than D4, α1 is greater than α2, α3 is greater than α4, D1 is equal to D3, and α1 is equal to α3.

[0011] In one embodiment, the value range of α1 is 40°-90°, and the value of α2 is equal to (α1-10°).

[0012] In one embodiment, the value of α1 is 60°.

[0013] In one embodiment, the tip of the first cutting head is provided with a first chamfer, the radius corresponding to the first chamfer is R1, the tip of the second cutting head is provided with a second chamfer, the radius corresponding to the second chamfer is R2, and R1 is equal to R2.

[0014] In one embodiment, the value range of R1 is 0.28 mm-0.32 mm.

[0015] In one embodiment, the value of R1 is 0.30 mm.

[0016] In one embodiment, the first main cutting edge further comprises a first main straight cutting edge connected to the first main bevel cutting edge, a third chamfer is provided at a connection portion between the first main bevel cutting edge and the first main straight cutting edge, and a radius corresponding to the third chamfer is R3;

[0017] The second main cutting edge also includes a second main straight cutting edge connected to the second main bevel cutting edge. A fourth chamfer is provided at the connection portion between the second main bevel cutting edge and the second main straight cutting edge. The radius corresponding to the fourth chamfer is R4, and R3 is equal to R4.

[0018] In one embodiment, the number of the first cutting heads is the same as the number of the second cutting heads.

[0019] In one embodiment, the tip of the first cutting head is connected to the center of the swivel to form a first line, and the deviation angle of the cutting edge of the first cutting head from the first line is α5. The tip of the second cutting head is connected to the center of the swivel to form a second line, and the deviation angle of the cutting edge of the second cutting head from the second line is α6, and α5 is equal to α6.

[0020] In one embodiment, a socket is provided at the center of the swivel, and the socket is used for installing a swivel column.

[0021] In the above-mentioned cutting tool, the tool width D1 of the first main cutting edge relative to the symmetry axis plane is greater than the tool width D2 of the first secondary cutting edge relative to the symmetry axis plane, and the deviation angles of the first main bevel cutting edge relative to the symmetry axis plane are α1 and α2, respectively, which are greater than the deviation angles of the first secondary bevel cutting edge relative to the symmetry axis plane, so that the area involved in cutting by the first main cutting edge is greater than that of the first secondary cutting edge; similarly, the tool width D3 of the second main cutting edge relative to the symmetry axis plane is greater than the tool width D4 of the second secondary cutting edge relative to the symmetry axis plane, and the deviation angles α3 of the second main bevel cutting edge relative to the symmetry axis plane are greater than the deviation angles α4 of the second secondary bevel cutting edge relative to the symmetry axis plane, respectively, so that the area involved in cutting by the second main cutting edge is greater than that of the second secondary cutting edge, and then when the first tool head and the second tool head alternately perform cutting processing on the workpiece, two cutting processings are realized on the workpiece, and two chips of different widths are generated, and the widths of the two chips are both smaller than the width of the milling groove formed by cutting, which helps to improve the situation where chips remain in the groove. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] FIG. 1 is a schematic structural diagram of a cutting tool according to an embodiment of the present application.

[0023] FIG. 2 is a cross-sectional view of the cutting tool shown in FIG. 1 at AA.

[0024] FIG. 3 is an enlarged view of the cross-sectional view shown in FIG. 2 at point C. FIG.

[0025] FIG. 4 is a cross-sectional view of the cutting tool shown in FIG. 1 at position BB.

[0026] FIG. 5 is an enlarged view of the cross-sectional view shown in FIG. 4 at point D. FIG.

[0027] FIG. 6 is a schematic diagram of a milling groove of a workpiece when a cutting tool according to an embodiment of the present application is cutting the workpiece.

[0028] FIG. 7 is a schematic diagram of a milling groove of a workpiece when a cutting tool according to another embodiment of the present application is cutting the workpiece.

[0029] Description of Figure Numbers

[0030] 10. Cutting tool; L1. first connecting line; L2. second connecting line; 20. workpiece; 100. swivel; 100a. symmetry axis; 100b. symmetry axis plane; 100c. socket; 100d. slot; 200. first tool head; 210. first main cutting edge; 211. first main bevel cutting edge; 212. first main straight cutting edge; 220. first secondary cutting edge; 221. first secondary bevel cutting edge; 222. first secondary straight cutting edge; 300. second tool head; 310. second main cutting edge; 311. second main bevel cutting edge; 312. second main straight cutting edge; 320. second secondary cutting edge; 321. second secondary bevel cutting edge; 322. second secondary straight cutting edge. DETAILED DESCRIPTION

[0031] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0032] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0033] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0034] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0035] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0036] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0037] Referring to FIG. 1 , FIG. 1 shows a schematic structural diagram of a cutting tool 10 according to an embodiment of the present application, and FIG. 2 is a cross-sectional view of the cutting tool 10 shown in FIG. 1 at AA. The cutting tool 10 according to an embodiment of the present application comprises a swivel 100, a first cutting assembly and a second cutting assembly. The swivel 100 has an axis of symmetry 100a and an axis of symmetry surface 100b. The first cutting assembly comprises at least two first cutter heads 200, and the second cutting assembly comprises at least two second cutter heads 300. The first cutter heads 200 and the second cutter heads 300 are alternately and evenly distributed on the circumferential surface of the swivel 100 around the axis of symmetry 100a.

[0038] As shown in FIG3 , FIG3 is an enlarged view of the cross-sectional view shown in FIG2 at point C. ...

[0039] The blade of the first cutting head 200 is divided into a first main cutting edge 210 and a first secondary cutting edge 220 along the symmetry axis plane 100b. The blade widths of the first main cutting edge 210 and the first secondary cutting edge 220 relative to the symmetry axis plane 100b are D1 and D2 respectively. The first main cutting edge 210 and the first secondary cutting edge 220 respectively include a first main beveled edge 211 and a first secondary beveled edge 221 near the blade tip. The deviation angles of the first main beveled edge 211 and the first secondary beveled edge 221 relative to the symmetry axis plane 100b are α1 and α2 respectively.

[0040] Combined with FIG. 5 , FIG. 5 is an enlarged view of the cross-sectional view shown in FIG. 4 at D. As shown in FIG.

[0041] The blade of the second cutting head 300 is divided into a second main cutting edge 310 and a second secondary cutting edge 320 along the symmetry axis plane 100b. The blade widths of the second main cutting edge 310 and the second main cutting edge 310 relative to the symmetry axis plane 100b are D3 and D4 respectively. The second main cutting edge 310 and the second secondary cutting edge 320 respectively include a second main bevel edge 311 and a second secondary bevel edge 321 near the blade tip. The deviation angles of the second main bevel edge 311 and the second secondary bevel edge 321 relative to the symmetry axis plane 100b are α3 and α4 respectively.

[0042] Furthermore, the first main cutting edge 210 and the second main cutting edge 310 are respectively located on both sides of the symmetry axis plane 100b, wherein D1 is greater than D2, D3 is greater than D4, α1 is greater than α2, α3 is greater than α4, D1 is equal to D3, and α1 is equal to α3.

[0043] In the above-mentioned cutting tool 10, the tool width D1 of the first main cutting edge 210 relative to the symmetry axis plane 100b is greater than the tool width D2 of the first secondary cutting edge 220 relative to the symmetry axis plane 100b, and the deviation angles of the first main chamfered edge 211 relative to the symmetry axis plane 100b are respectively α1 and α2, respectively, which are greater than the deviation angles of the first secondary chamfered edge 221 relative to the symmetry axis plane 100b, so that the area involved in cutting by the first main cutting edge 210 is larger than that of the first secondary cutting edge 220; similarly, the tool width D3 of the second main cutting edge 310 relative to the symmetry axis plane 100b is greater than that of the second secondary cutting edge 320 relative to the symmetry axis plane 100b. The tool width D4 of the axial surface 100b, the deviation angle α3 of the second main bevel cutting edge 311 relative to the symmetry axis surface 100b is greater than the deviation angle α4 of the second secondary bevel cutting edge 321 relative to the symmetry axis surface 100b, so that the area involved in the cutting of the second main cutting edge 310 is larger than the second secondary cutting edge 320, and then when the first cutter head 200 and the second cutter head 300 alternately cut the workpiece 20, the workpiece 20 is cut twice and two chips of different widths are generated, and the widths of the two chips are smaller than the width of the milling groove formed by the cutting, which helps to avoid chips remaining in the milling groove.

[0044] As shown in FIG. 6 , FIG. 6 is a schematic diagram of the milling groove of the workpiece 20 when the cutting tool 10 according to an embodiment of the present application is cutting the workpiece 20 . The cutting process of the cutting tool 10 according to the above scheme is further analyzed below.

[0045] First, since the first tool head 200 and the second tool head 300 perform cutting processing on the workpiece 20 alternately, FIG6 includes both the cutting traces of the first tool head 200 and the cutting traces of the second tool head 300. Specifically, the dotted outline portion represents the cutting trace of the first tool head 200 on the workpiece 20, and the solid outline portion represents the cutting trace of the second tool head 300 on the workpiece 20.

[0046] Secondly, assume that in one cutting process, the first cutter head 200 first cuts the workpiece 20, and then the second cutter head 300 cuts the workpiece 20, and then the first cutter head 200 and the second cutter head 300 cut the workpiece 20 alternately in sequence. Further analysis is performed under this assumption.

[0047] As can be seen from FIG6 , the final result of the first cutter head 200 and the second cutter head 300 cutting the workpiece 20 alternately in sequence is to generate a milling groove with a width of (d1+D4+D2+d2). In the above-mentioned milling groove formation process, since the first cutter head 200 cuts the workpiece 20 first, a milling groove with a width of (D1+D2) is formed first, and when the second cutter head 300 cuts the workpiece 20, the second cutter head 300 will have repeated cutting at the position with a width of (D4+D2), so the second cutter head 300 does not participate in the cutting at the position with a width of (D4+D2), and the actual cutting width is d2. It can be seen that in the two cutting processes, a chip with a width of (D1+D2) and a chip with a width of d2 will eventually be generated, and since the widths of the two chips are both smaller than the total width Z of the milling groove, it is possible to avoid the two chips from being stuck and remaining in the milling groove.

[0048] Combined with FIG7 , the V-shaped portion of the milling groove formed by the first main bevel edge 211, the first secondary bevel edge 221, the second main bevel edge 311 and the second secondary bevel edge 321 cutting the workpiece 20 is further analyzed. The final result of the first cutter head 200 and the second cutter head 300 cutting the workpiece 20 alternately in sequence is to generate a V-shaped groove with a total angle of (α1+α3). In the above-mentioned V-shaped groove formation process, since the first cutter head 200 cuts the workpiece 20 first, a V-shaped groove with an angle of (α1+α2) is first formed, and when the second cutter head 300 cuts the workpiece 20, the second cutter head 300 will have repeated cutting at the angle of (α4+α2), so the second cutter head 300 does not participate in cutting at the angle of (α4+α2), and the actual cutting angle is (α3-α2). It can be seen that in the two cutting processes, a chip with an angle of (α1+α2) and a chip with an angle of (α3-α2) will eventually be generated. Since the angles of the two chips are smaller than the total angle of the V-groove (α1+α3), the two chips can be prevented from getting stuck and remaining in the milling groove.

[0049] Based on the above analysis, it can be seen that during the two processing processes of the first cutter head 200 and the second cutter head 300 on the workpiece 20, two chips will be generated, wherein the first cutter head 200 will form a chip with a width of (D1+D2) and an angle of (α1+α2), and the second cutter head 300 will form another chip with a width of d2 and an angle of (α3-α2). Both chips will be smaller than the total width Z and the total V-shaped angle (α1+α3) of the milling groove, thus helping to prevent the chips from being stuck and remaining in the milling groove.

[0050] It should be noted that when using traditional tools for milling grooves, the width of the blade part of the tool is generally equal to the width of the final milling groove, and chips of equal width are generated. This will cause chips of equal width to be stuck and remain in the milling groove. The above-mentioned scheme of the present application effectively reduces the width and V-shaped angle of the chips, and avoids the chips being stuck and remaining in the milling groove.

[0051] It should be noted that the above content of the present application only analyzes the situation where the first cutter head 200 first cuts the workpiece 20 and then the second cutter head 300 cuts the workpiece 20. It is understandable that the situation where the second cutter head 300 first cuts the workpiece 20 and then the first cutter head 200 cuts the workpiece 20 is similar to the above analysis and will not be repeated here.

[0052] Furthermore, in the above scheme, the final shape of the milling groove depends on the shape and size of the first main cutting edge 210 and the second main cutting edge 310, which have a wider blade width and a larger deviation angle than their respective secondary cutting edges. Therefore, the first main cutting edge 210 and the second main cutting edge 310 in the above scheme are respectively located on both sides of the symmetry axis plane 100b, and D1 is equal to D3, and α1 is equal to α3. In this way, the first main cutting edge 210 and the second main cutting edge 310 can form a "complementary" cutting effect, and finally the milling groove is axially symmetrical, thereby ensuring the effect of the milling groove processing.

[0053] In some embodiments, the value range of α1 is 40°-90°, and the value of α2 is (α1-10°). As mentioned above, α1 can be 40°, 60° or 90°.

[0054] Specifically, in some embodiments, α1 and α2 may be 40° and 30°, respectively. In some embodiments, α1 and α2 may be 60° and 50°, respectively. In other embodiments, α1 and α2 may be 90° and 80°, respectively.

[0055] Preferably, in some embodiments, the value of α1 is 60°, and the value of α2 is 50°.

[0056] As shown in combination with FIG3 and FIG5, in some embodiments, the tip of the first cutting head 200 is provided with a first chamfer, and the radius corresponding to the first chamfer is R1. The tip of the second cutting head 300 is provided with a second chamfer, and the radius corresponding to the second chamfer is R2, and R1 is equal to R2, so that the milling groove formed by the final cutting can have a chamfer effect, and the chamfer effect is an axisymmetric shape.

[0057] Specifically, as shown in FIG. 7 , since R1 is equal to R2, in the V-groove portion of the milling groove, during the cutting process of the first cutter head 200 and the second cutter head 300, the chamfers formed by the cutting of their respective cutting tips will overlap and be axially symmetrical, which helps to improve the milling effect.

[0058] Further, referring to Figures 3 and 5, in some embodiments, the first main cutting edge 210 further includes a first main straight cutting edge 212 connected to the first main bevel cutting edge 211, and a third chamfer is provided at the connection between the first main bevel cutting edge 211 and the first main straight cutting edge 212, and the radius corresponding to the third chamfer is R3. The second main cutting edge 310 further includes a second main straight cutting edge 312 connected to the second main bevel cutting edge 311, and a fourth chamfer is provided at the connection between the second main bevel cutting edge 311 and the second main straight cutting edge 312, and the radius corresponding to the fourth chamfer is R4, and R3 is equal to R4.

[0059] Specifically, as shown in FIG. 7 , since R3 is equal to R4, in the V-groove portion of the milling groove, the third chamfer and the fourth chamfer formed by the cutting process of the first cutter head 200 and the second cutter head 300 respectively will be axially symmetrically distributed, which helps to improve the milling groove processing effect.

[0060] In some embodiments, the value range of R1 is 0.28mm-0.32mm. Specifically, R1 can be 0.28mm, 0.30mm or 0.32mm. Correspondingly, since R2 is equal to R1, the value range of R2 is also 0.28mm-0.32mm. Specifically, R2 can also be 0.28mm, 0.30mm or 0.32mm. Preferably, in some embodiments, the values ​​of R1 and R2 are both 0.30mm.

[0061] In some embodiments, the number of the first cutting heads 200 and the number of the second cutting heads 300 are the same, which helps to improve the wear uniformity of the cutting tools and thus increase the service life of the cutting tools.

[0062] As shown in FIG1 , in some embodiments, the tip of the first cutter head 200 is connected to the center of the swivel 100 to form a first line L1, and the deviation angle of the blade of the first cutter head 200 from the first line L1 is α5. The tip of the second cutter head 300 is connected to the center of the swivel 100 to form a second line L2, and the deviation angle of the blade of the second cutter head 300 from the second line L2 is α6, and α5 is equal to α6, so that the consistency of the deviation angles of the blades of the first cutter head 200 and the second cutter head 300 can be ensured, which helps to improve the wear uniformity or force uniformity of the cutter, thereby improving the life of the cutter.

[0063] Further, in some embodiments, the deviation angle α5 of the blade of the first cutting head 200 from the first connecting line L1 ranges from 8° to 12°. Specifically, α5 can be 8°, 10° or 12°. Correspondingly, since α5 is equal to α6, the value range of α6 is also 8° to 12°. Specifically, α6 can also be 8°, 10° or 12°. Preferably, in some embodiments, the values ​​of α5 and α6 are both 10°.

[0064] As shown in FIG. 1 , in some embodiments, a socket 100c is provided at the center of the swivel 100, and the socket 100c is used to install a rotating column (not shown), and the rotating column is used to connect a power mechanism, and the power mechanism drives the rotating body 100 to rotate by driving the rotating column to rotate, thereby realizing the operation of the cutting tool 10 of the present application. Furthermore, the socket 100c is also provided with a slot 100d, and the rotating column can be snapped into the slot 100d to achieve a stable installation, and prevent the relative rotation between the rotating column and the swivel 100, thereby improving the working reliability of the cutting tool 10.

[0065] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0066] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A cutting tool, characterized in that: include: A swivel, the swivel having an axis of symmetry and an axis of symmetry; A first cutting assembly, wherein the first cutting assembly comprises at least two first cutting heads, wherein the cutting edge of the first cutting head is divided into a first main cutting edge and a first secondary cutting edge along the symmetry axis plane, wherein the widths of the first main cutting edge and the first secondary cutting edge relative to the symmetry axis plane are D1 and D2 respectively, wherein the first main cutting edge and the first secondary cutting edge respectively comprise a first main bevel cutting edge and a first secondary bevel cutting edge near the cutting tip, wherein the deviation angles of the first main bevel cutting edge and the first secondary bevel cutting edge relative to the symmetry axis plane are α1 and α2 respectively; A second cutting assembly, wherein the second cutting assembly comprises at least two second cutting heads, wherein the cutting edge of the second cutting head is divided into a second main cutting edge and a second secondary cutting edge along the symmetry axis plane, wherein the widths of the second main cutting edge and the second secondary cutting edge relative to the symmetry axis plane are D3 and D4 respectively, wherein the second main cutting edge and the second secondary cutting edge respectively comprise a second main bevel cutting edge and a second secondary bevel cutting edge near the cutting tip, wherein the deviation angles of the second main bevel cutting edge and the second secondary bevel cutting edge relative to the symmetry axis plane are α3 and α4 respectively; The first cutter head and the second cutter head are alternately and evenly distributed on the circumferential surface of the rotator around the axis of symmetry, and the first main cutting edge and the second main cutting edge are respectively located on both sides of the axis of symmetry, wherein D1 is greater than D2, D3 is greater than D4, α1 is greater than α2, α3 is greater than α4, D1 is equal to D3, and α1 is equal to α3.

2. The cutting tool according to claim 1, characterized in that: The value range of α1 is 40°-90°, and the value of α2 is equal to (α1-10°).

3. The cutting tool according to claim 2, characterized in that: The value of α1 is 60°.

4. The cutting tool according to claim 1, characterized in that: The tip of the first tool head is provided with a first chamfer, the radius corresponding to the first chamfer is R1, the tip of the second tool head is provided with a second chamfer, the radius corresponding to the second chamfer is R2, and R1 is equal to R2.

5. The cutting tool according to claim 4, characterized in that: The value range of R1 is 0.28mm-0.32mm.

6. The cutting tool according to claim 5, characterized in that: The value of R1 is 0.30mm.

7. The cutting tool according to claim 1, characterized in that: The first main cutting edge further comprises a first main straight cutting edge connected to the first main bevel cutting edge, a third chamfer is provided at a connection portion between the first main bevel cutting edge and the first main straight cutting edge, and a radius corresponding to the third chamfer is R3; The second main cutting edge also includes a second main straight cutting edge connected to the second main bevel cutting edge. A fourth chamfer is provided at the connection portion between the second main bevel cutting edge and the second main straight cutting edge. The radius corresponding to the fourth chamfer is R4, and R3 is equal to R4.

8. The cutting tool according to claim 1, characterized in that: The number of the first cutting heads is the same as the number of the second cutting heads.

9. The cutting tool according to claim 1, characterized in that: The tip of the first cutting head is connected to the center of the swivel to form a first connecting line, and the deviation angle of the cutting edge of the first cutting head from the first connecting line is α5. The tip of the second cutting head is connected to the center of the swivel to form a second connecting line, and the deviation angle of the cutting edge of the second cutting head from the second connecting line is α6, and α5 is equal to α6.

10. The cutting tool according to claim 1, characterized in that: A plug hole is provided at the center of the rotating body, and the plug hole is used for installing a rotating column.

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