Dovetail groove cutter and dovetail groove machining method

Abstract

The invention relates to the technical field of machining, and particularly discloses a dovetail groove cutter and a dovetail groove machining method.The dovetail groove cutter is provided with a left hand cutter and a right hand cutter which are used for machining the right side and the left side of a dovetail groove correspondingly, and the left hand cutter and the right hand cutter are both made of diamond materials, so that it can be effectively guaranteed that the surface roughness of an aluminum profile after machining is low; for the left-hand knife, the left-knife main edge is arranged to cut a workpiece in the radial direction, the left-knife first auxiliary edge and the left-knife second auxiliary edge are arranged to cut the workpiece in the axial direction, the cutting directions are opposite, the right-hand knife is similar to the left-hand knife, and the left-hand knife and the right-hand knife are matched to ensure that the surface roughness of a finally-machined dovetail groove meets the requirement.

Description

Technical Field

[0001] The invention relates to the technical field of machining, and in particular to a dovetail groove tool and a dovetail groove machining method. Background Art

[0002] In the process of semiconductor component assembly and sealing, it is usually necessary to open an annular dovetail groove on the surface of the aluminum profile and use an O-ring to achieve sealing. In order to further improve the sealing performance, it is necessary to ensure that the surface roughness of the dovetail groove is low. However, the material hardness of the aluminum profile is low, and it is impossible to machine a dovetail groove with surface roughness that meets the requirements when using ordinary dovetail groove tools for processing. In addition, due to the soft aluminum profile, potholes will appear at the bottom of the groove, resulting in a low yield rate. Summary of the invention

[0003] The object of the present invention is to provide a dovetail groove tool, namely a dovetail groove processing method, so as to solve the problem that the surface roughness of the dovetail groove processed by the existing tool does not meet the requirements and the yield rate is reduced.

[0004] The present invention provides a dovetail groove tool, comprising a left-handed tool and a right-handed tool, wherein the left-handed tool is used for processing the right side of the dovetail groove, and the right-handed tool is used for processing the left side of the dovetail groove, the left-handed tool comprises a left tool rod, the left tool rod is fixedly connected with a left blade, the left blade is fixedly provided with a left tool head, the left tool head is made of diamond material, the left tool head is provided with a left tool rake face, a left tool main flank face, a left tool first secondary flank face and a left tool second secondary flank face, the left tool rake face and the left tool main flank face form a left tool main edge, the left tool rake face and the left tool first secondary flank face form a left tool first secondary edge, the left tool rake face and the left tool second secondary flank face form a left tool second secondary edge, the left tool main edge is used for radial cutting of a workpiece, and the left tool first secondary edge and the left tool second secondary edge are used for axial cutting of the workpiece The right-hand knife comprises a right knife bar, the right knife bar is fixedly connected with a right knife body, the right knife body is fixedly provided with a right knife head, the right knife head is made of diamond material, the right knife head is provided with a right knife rake face, a right knife main rear face, a right knife first rear face and a right knife second rear face, the right knife rake face and the right knife main rear face form a right knife main edge, the right knife rake face and the right knife first rear face form a right knife first secondary edge, the right knife rake face and the right knife second rear face form a right knife second secondary edge, the right knife main edge is used for radial cutting of the workpiece, the right knife first secondary edge and the right knife second secondary edge are used for axial cutting of the workpiece, and the cutting directions of the right knife first secondary edge and the right knife second secondary edge are opposite.

[0005] As a preferred technical solution for the dovetail groove tool, the back angle of the first secondary edge of the left tool is 4°-7°, and the back angle of the first secondary edge of the right tool is 4°-7°.

[0006] As a preferred technical solution for the dovetail groove tool, the back angle of the second secondary edge of the left tool is 1°-2°, and the back angle of the second secondary edge of the right tool is 1°-2°.

[0007] As a preferred technical solution of the dovetail groove tool, the left tool rake face, the left tool main flank face and the left tool first secondary flank face form a left tool first tool tip, and the radius of the left tool first tool tip is 0.2±0.02mm;

[0008] The right knife rake face, the right knife main flank face and the right knife first secondary flank face form a right knife first cutting edge, and the radius of the right knife first cutting edge is 0.2±0.02 mm.

[0009] As a preferred technical solution of the dovetail groove tool, the left tool rake face, the left tool main flank face and the left tool second secondary flank face form a left tool second tool tip, and the radius of the left tool second tool tip is 0.05mm-0.1mm;

[0010] The right knife rake face, the right knife main flank face and the right knife second secondary flank face form a right knife second knife tip, and the radius of the right knife second knife tip is 0.05mm-0.1mm.

[0011] As a preferred technical solution for the dovetail groove tool, the angle between the extension direction of the left tool main edge and the length direction of the left tool bar is 86°-88°;

[0012] The angle between the extension direction of the right knife main edge and the length direction of the right knife rod is 86°-88°.

[0013] As a preferred technical solution of the dovetail groove tool, the angle between the first secondary edge of the left tool and the main edge of the left tool is equal to the angle between the right side wall and the bottom wall of the dovetail groove;

[0014] The included angle between the first auxiliary edge of the right knife and the main edge of the right knife is equal to the included angle between the left side wall and the bottom wall of the dovetail groove.

[0015] As a preferred technical solution of the dovetail groove tool, the angle between the second secondary edge of the left tool and the main edge of the left tool is 99°-100°;

[0016] The angle between the second auxiliary edge of the right knife and the main edge of the right knife is 99°-100°.

[0017] As a preferred technical solution of the dovetail groove tool, the height of the left cutter head is greater than the depth of the dovetail groove;

[0018] The height of the right cutter head is greater than the depth of the dovetail groove.

[0019] The present invention provides a dovetail groove processing method, using a straight groove tool and a dovetail groove tool of any of the above schemes to process a workpiece, and the dovetail groove processing method comprises the following steps:

[0020] S1, machining a straight groove on the workpiece, and making the width of the straight groove larger than the width of the left-hand knife and the right-hand knife and smaller than the width of the dovetail groove; and making the depth of the straight groove smaller than the depth of the dovetail groove;

[0021] S2. Use the left-hand tool to perform axial cutting and radial cutting on the right side wall of the straight groove, and use the right-hand tool to perform axial cutting and radial cutting on the left side wall of the straight groove.

[0022] The beneficial effects of the present invention are:

[0023] The present invention provides a dovetail groove tool. A left-hand tool and a right-hand tool are arranged to process the right side and the left side of the dovetail groove respectively. Both the left-hand tool and the right-hand tool are made of diamond material, which can effectively ensure that the surface roughness of the aluminum profile after processing is low. For the left-hand tool, the left-hand main edge is arranged to perform radial cutting on the workpiece, and the left-hand first secondary edge and the left-hand second secondary edge perform axial cutting on the workpiece in opposite cutting directions. The right-hand tool is similar to the left-hand tool. Through the cooperation of the left-hand tool and the right-hand tool, it is ensured that the surface roughness of the dovetail groove finally processed meets the requirements.

[0024] The present invention provides a method for processing a dovetail groove. By using the dovetail groove tool of the present invention, a straight groove is cut using a straight groove cutter, and the dovetail groove tool is used for fine processing, thereby ensuring that the surface roughness of the dovetail groove meets the requirements while also reducing the frequency and duration of use of the dovetail groove tool, thereby increasing its service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the structure of a left-hand knife in an embodiment of the present invention;

[0026] Figure 2 It is a structural schematic diagram of a right-hand knife in an embodiment of the present invention;

[0027] Figure 3 A schematic diagram of the structure of a left blade and a left blade head in an embodiment of the present invention;

[0028] Figure 4 It is a schematic structural diagram of a right blade body and a right blade head in an embodiment of the present invention;

[0029] Figure 5 It is a front view of a left-hand knife in an embodiment of the present invention;

[0030] Figure 6It is a partial enlarged view of the left blade head of the left-hand knife in the embodiment of the present invention;

[0031] Figure 7 It is a front view of a right-hand knife in an embodiment of the present invention;

[0032] Figure 8 It is a partial enlarged view of the right blade head of the right-hand knife in the embodiment of the present invention;

[0033] Fig. 9 The cutting paths of the left-hand tool and the right-hand tool when machining the dovetail groove in the embodiment of the present invention are shown in FIG.

[0034] In the figure:

[0035] 11. Left blade; 12. Left blade; 13. Left blade head;

[0036] 131, front blade of left knife; 132, main back blade of left knife; 133, first secondary back blade of left knife; 134, main edge of left knife; 135, first secondary edge of left knife; 136, second secondary edge of left knife; 137, first tip of left knife; 138, second tip of left knife;

[0037] 21. Right knife handle; 22. Right knife body; 23. Right knife head;

[0038] 231. The front blade surface of the right knife; 232. The main back blade surface of the right knife; 233. The first secondary back blade surface of the right knife; 234. The main edge of the right knife; 235. The first secondary edge of the right knife; 236. The second secondary edge of the right knife; 237. The first tip of the right knife; 238. The second tip of the right knife. DETAILED DESCRIPTION

[0039] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] In the description of the present invention, it should be noted that the orientations or positional relationships indicated by the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. are based on the orientations or positional relationships shown in the accompanying 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 therefore cannot be understood as limiting 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. Among them, the terms "first position" and "second position" are two different positions, and the first feature "above", "above" and "above" the second feature include the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. The first feature "below", "below" and "below" the second feature include the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0041] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0043] like Figure 1-Figure 8As shown, the present invention provides a dovetail groove tool, which is used for turning an annular dovetail groove. The dovetail groove tool includes a left-hand tool and a right-hand tool. The left-hand tool is used to process the right side of the dovetail groove, and the right-hand tool is used to process the left side of the dovetail groove. The left-hand tool includes a left tool bar 11, and a left blade 12 is fixedly connected to the left tool bar 11. The left tool bar 11 is provided with a groove matching the shape of the left blade 12. The left blade 12 is embedded in the groove and fixedly connected to the left tool bar 11 by bolts. A left cutter head 13 is fixedly provided on the left blade 12, and the left cutter head 13 is made of diamond. The left cutter head 13 is provided with a left cutter rake face 131, a left cutter main back face 132, a left cutter first secondary back face 133 and a left cutter second secondary back face (not shown in the figure). The left tool rake face 131 and the left tool main flank face 132 form a left tool main edge 134, the left tool rake face 131 and the left tool first secondary flank face 133 form a left tool first secondary edge 135, and the left tool rake face 131 and the left tool second secondary flank face form a left tool second secondary edge 136. The left tool main edge 134 is used for radial cutting of the workpiece, that is, for cutting along the depth direction of the dovetail groove, and the left tool first secondary edge 135 and the left tool second secondary edge 136 are used for axial cutting of the workpiece, that is, for cutting along the width direction of the dovetail groove. The cutting directions of the left tool first secondary edge 135 and the left tool second secondary edge 136 are opposite. Similarly, the right tool head 23 is provided with a right tool rake face 231, a right tool main flank face 232, a right tool first secondary flank face 233 and a right tool second secondary flank face (not shown in the figure). The right knife rake face 231 and the right knife main flank face 232 form a right knife main edge 234, the right knife rake face 231 and the right knife first secondary flank face 233 form a right knife first secondary edge 235, and the right knife rake face 231 and the right knife second secondary flank face form a right knife second secondary edge 236. The right knife main edge 234 is used for radial cutting of the workpiece, that is, for cutting along the depth direction of the dovetail groove, and the right knife first secondary edge 235 and the right knife second secondary edge 236 are used for axial cutting of the workpiece, that is, for cutting along the width direction of the dovetail groove. The cutting directions of the right knife first secondary edge 235 and the right knife second secondary edge 236 are opposite. A left-handed tool and a right-handed tool are set to process the right side and the left side of the dovetail groove respectively, and both the left-handed tool and the right-handed tool are made of diamond material, which can effectively ensure that the surface roughness of the aluminum profile after processing is low. For the left-handed tool, the left-handed tool main edge 134 is set to perform radial cutting on the workpiece, and the left-handed tool first auxiliary edge 135 and the left-handed tool second auxiliary edge 136 are set to perform axial cutting on the workpiece and the cutting directions are opposite. The right-handed tool is the same as the left-handed tool. Through the cooperation of the left-handed tool and the right-handed tool, it is ensured that the surface roughness of the finally processed dovetail groove meets the requirements.

[0044] Further, the back angle of the first auxiliary edge 135 of the left knife is 4°-7°, and the back angle of the first auxiliary edge 235 of the right knife is 4°-7°. For example, the back angle of the first auxiliary edge 135 of the left knife can be 4°, 5°, 6° or 7°, and the back angle of the first auxiliary edge 235 of the right knife can be 4°, 5°, 6° or 7°. The back angle of the second auxiliary edge 136 of the left knife is 1°-2°, and the back angle of the second auxiliary edge 236 of the right knife is 1°-2°. For example, the back angle of the second auxiliary edge 136 of the left knife can be 1° or 2°, and the back angle of the second auxiliary edge 236 of the right knife can be 1° or 2°. Through the above settings, it can be ensured that the surface roughness of the side wall and the bottom wall of the dovetail groove after processing meets the requirements, and the deterioration of the surface quality after processing due to the vibration of the tool during the processing is avoided.

[0045] Furthermore, if Figure 3-Figure 4 As shown, the left knife rake face 131, the left knife main back knife face 132 and the left knife first secondary back knife face 133 form a left knife first cutting edge 137, and the radius of the left knife first cutting edge 137 is 0.2±0.02mm. The right knife rake face 231, the right knife main back knife face 232 and the right knife first secondary back knife face 233 form a right knife first cutting edge 237, and the radius of the right knife first cutting edge 237 is 0.2±0.02mm. By setting the radii of the left knife first cutting edge 137 and the right knife first cutting edge 237 to 0.2±0.02mm, the vibration of the cutting edge is smaller during the processing, which is more conducive to improving the surface quality after processing and further reducing the surface roughness. In addition, please continue to refer to Figure 3-Figure 4 , and combined with Figure 5 and Figure 7The left knife rake face 131, the left knife main back face 132 and the left knife second secondary back face form a left knife second knife tip 138, and the radius of the left knife second knife tip 138 is 0.05mm-0.1mm. For example, the radius of the left knife second knife tip 138 can be 0.05mm, 0.06mm, 0.07mm, 0.08mm, 0.09mm or 0.1mm. The right knife rake face 231, the right knife main back face 232 and the right knife second secondary back face form a right knife second knife tip 238, and the radius of the right knife second knife tip 238 is 0.05mm-0.1mm. For example, the radius of the right knife second knife tip 238 can be 0.05mm, 0.06mm, 0.07mm, 0.08mm, 0.09mm or 0.1mm. The radius of the left knife second blade tip 138 and the right knife second blade tip 238 is set to a smaller value, so that the vibration of the blade tip is smaller during the processing, which is more conducive to improving the surface quality after processing and further reducing the roughness. The radius of the left knife first blade tip 137 in this embodiment is smaller than the radius of the left knife second blade tip 138, and the radius of the right knife first blade tip 237 is smaller than the radius of the right knife second blade tip 238. It can be understood that during the processing, the left knife first blade tip 137 is mainly used to process the right side wall of the dovetail groove and ensure the surface roughness of the side wall of the dovetail groove, and the left knife second blade tip 138 is mainly used to process the bottom wall of the dovetail groove and ensure the surface roughness of the bottom wall of the dovetail groove. In the actual processing, the cutting amount of the first blade tip 137 of the left knife is greater than the cutting amount of the second blade tip 138 of the left knife. Therefore, the radius of the first blade tip 137 of the left knife is set to be greater than the radius of the second blade tip 138 of the left knife, so as to meet the surface quality requirements after processing and improve the service life, and the surface quality of the bottom wall of the dovetail groove processed by the second blade tip 138 of the left knife is better. The first blade tip 237 of the right knife is mainly used to process the left side wall of the dovetail groove and ensure the surface roughness of the side wall of the dovetail groove. The second blade tip 238 of the right knife is mainly used to process the bottom wall of the dovetail groove and ensure the surface roughness of the bottom wall of the dovetail groove. In the actual processing, the cutting amount of the first blade tip 237 of the right knife is greater than the cutting amount of the second blade tip 238 of the right knife. Therefore, the radius of the first blade tip 237 of the right knife is set to be greater than the radius of the second blade tip 238 of the right knife, so as to meet the surface quality requirements after processing and improve the service life, and the surface quality of the bottom wall of the dovetail groove processed by the second blade tip 238 of the right knife is better.

[0046] Specifically, Figure 5-Figure 8 As shown, the angle between the extension direction of the left main blade 134 and the length direction of the left blade rod 11 is 86°-88°. For example, the angle between the extension direction of the left main blade 134 and the length direction of the left blade rod 11 is 86°, 87° or 88°. Figure 6The left main cutting edge 134 is cut along the radial direction during machining. By setting it in this way, the contact length between the left main cutting edge 134 and the workpiece is longer, so that the cutting force is dispersed more evenly, avoiding deformation of the workpiece. Similarly, the angle between the extension direction of the right main cutting edge 234 and the length direction of the right tool bar 21 is 86°-88°. For example, the angle between the extension direction of the right main cutting edge 234 and the length direction of the right tool bar 21 is 86°, 87° or 88°. Please refer to Figure 8 The right main cutting edge 234 is fed and cut in the radial direction during machining. By setting it in this way, the contact length between the right main cutting edge 234 and the workpiece is longer, so that the cutting force is dispersed more evenly, avoiding the deformation of the workpiece.

[0047] Further, to ensure processing efficiency, the angle between the left first auxiliary edge 135 and the left main edge 134 is equal to the angle between the right side wall and the bottom wall of the dovetail groove. Figure 6 The angle between the first auxiliary edge 235 of the right knife and the main edge 234 of the right knife is equal to the angle between the left wall and the bottom wall of the dovetail groove. Please refer to Figure 8 By setting the included angle between the left first secondary edge 135 and the left main edge 134 to be equal to the included angle between the right side wall and the bottom wall of the dovetail groove, and setting the included angle between the right first secondary edge 235 and the right main edge 234 to be equal to the included angle between the left side wall and the bottom wall of the dovetail groove, the side wall of the dovetail groove can be directly cut and formed during the processing.

[0048] For further information, please refer to Figure 6 and Figure 8 As shown, the angle between the left knife second auxiliary edge 136 and the left knife main edge 134 is 99° or 100°. Please refer to Figure 6 The angle between the second auxiliary edge 236 of the right knife and the main edge 234 of the right knife is 99°-100°. Please refer to Figure 8 The angle B3 is shown in FIG. 4. Through the above arrangement, the surface roughness after processing can be further guaranteed.

[0049] Optionally, the height of the left cutter head 13 is greater than the depth of the dovetail groove, and the height of the right cutter head 23 is greater than the depth of the dovetail groove, thereby ensuring that the inner wall of the finally formed dovetail groove is processed by the left cutter head 13 and the right cutter head 23 made of diamond material, ensuring that the surface roughness of the inner wall of the dovetail groove has a high consistency.

[0050] The present invention provides a dovetail groove processing method, which uses a straight groove tool and the dovetail groove tool in this embodiment to process a workpiece. The dovetail groove processing method includes the following steps:

[0051] S1. Use a straight groove cutter to process a straight groove on a workpiece, and make the width of the straight groove greater than the width of the left-hand cutter and the right-hand cutter, so as to ensure that the left-hand cutter and the right-hand cutter can smoothly enter the straight groove during the subsequent processing. The width of the straight groove is smaller than the width of the dovetail groove, and the depth of the straight groove is smaller than the depth of the dovetail groove, so as to ensure that the left-hand cutter and the right-hand cutter have sufficient margin to cut the dovetail groove. By using a straight groove cutter to process the straight groove first, the cutting workload of the left-hand cutter and the right-hand cutter is reduced, thereby reducing the wear of the left cutter head 13 and the right cutter head 23, extending the service life and reducing the tool cost.

[0052] S2. Use the left-hand tool to perform axial and radial cutting on the right side wall of the straight groove. Please refer to the movement trajectory of the left-hand tool. Fig. 9 The path shown by the dotted line; use the right-hand tool to perform axial and radial cutting on the left side wall of the straight groove. For the movement trajectory of the right-hand tool, please refer to Fig. 9 The path shown by the dotted line in the middle. And the workpiece can be cut multiple times according to the actual processing requirements and the remaining margin after processing the straight groove to ensure that the surface roughness of the inner wall of the final dovetail groove meets the requirements.

[0053] By using the dovetail groove tool in this embodiment, using a straight groove tool to cut the straight groove, and using the dovetail groove tool for fine processing, while ensuring that the surface roughness of the dovetail groove meets the requirements, the frequency and duration of use of the dovetail groove tool are reduced, thereby increasing its service life.

[0054] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. Dovetail groove tool, characterized in that: It comprises a left-hand knife and a right-hand knife, wherein the left-hand knife is used for processing the right side of the dovetail groove, and the right-hand knife is used for processing the left side of the dovetail groove; The left-hand knife comprises a left knife bar (11), a left knife body (12) is fixedly connected to the left knife bar (11), a left knife head (13) is fixedly arranged on the left knife body (12), the left knife head (13) is made of diamond material, the left knife head (13) is provided with a left knife rake face (131), a left knife main rear face (132), a left knife first auxiliary rear face (133) and a left knife second auxiliary rear face, the left knife rake face (131) and the left knife main rear face (132) form a left knife main edge (134), the left knife The front cutting surface (131) of the left cutting tool and the first auxiliary flank surface (133) of the left cutting tool form a first auxiliary cutting edge (135) of the left cutting tool, the front cutting surface (131) of the left cutting tool and the second auxiliary flank surface of the left cutting tool form a second auxiliary cutting edge (136) of the left cutting tool, the main cutting edge (134) of the left cutting tool is used for radial cutting of the workpiece, the first auxiliary cutting edge (135) of the left cutting tool and the second auxiliary cutting edge (136) of the left cutting tool are used for axial cutting of the workpiece, and the cutting directions of the first auxiliary cutting edge (135) of the left cutting tool and the second auxiliary cutting edge (136) of the left cutting tool are opposite; The right-hand knife comprises a right knife bar (21), a right knife body (22) is fixedly connected to the right knife bar (21), a right knife head (23) is fixedly arranged on the right knife body (22), the right knife head (23) is made of diamond material, the right knife head (23) is provided with a right knife rake face (231), a right knife main back knife face (232), a right knife first secondary back knife face (233) and a right knife second secondary back knife face, the right knife rake face (231) and the right knife main back knife face (232) form a right knife main edge (234), the right knife The front cutting edge (231) and the first secondary back cutting edge (233) of the right cutting tool form a first secondary cutting edge (235) of the right cutting tool, the front cutting edge (231) and the second secondary back cutting edge (236) of the right cutting tool form a second secondary cutting edge (236) of the right cutting tool, the main cutting edge (234) of the right cutting tool is used for radial cutting of the workpiece, the first secondary cutting edge (235) of the right cutting tool and the second secondary cutting edge (236) of the right cutting tool are used for axial cutting of the workpiece, and the cutting directions of the first secondary cutting edge (235) of the right cutting tool and the second secondary cutting edge (236) of the right cutting tool are opposite.

2. The dovetail groove tool according to claim 1, characterized in that: The back angle of the first auxiliary edge (135) of the left knife is 4°-7°, and the back angle of the first auxiliary edge (235) of the right knife is 4°-7°.

3. The dovetail groove tool according to claim 1, characterized in that: The back angle of the second auxiliary edge (136) of the left knife is 1°-2°, and the back angle of the second auxiliary edge (236) of the right knife is 1°-2°.

4. The dovetail groove tool according to claim 1, characterized in that: The left knife rake face (131), the left knife main flank face (132) and the left knife first secondary flank face (133) form a left knife first knife tip (137), and the radius of the left knife first knife tip (137) is 0.2±0.02 mm; The right knife front cutting surface (231), the right knife main back cutting surface (232) and the right knife first auxiliary back cutting surface (233) form a right knife first cutting edge (237), and the radius of the right knife first cutting edge (237) is 0.2±0.02mm.

5. The dovetail groove tool according to claim 1, characterized in that: The left knife rake face (131), the left knife main flank face (132) and the left knife second secondary flank face form a left knife second knife tip (138), and the radius of the left knife second knife tip (138) is 0.05 mm-0.1 mm; The right knife front cutting surface (231), the right knife main back cutting surface (232) and the right knife second auxiliary back cutting surface form a right knife second cutting tip (238), and the radius of the right knife second cutting tip (238) is 0.05mm-0.1mm.

6. The dovetail groove tool according to claim 1, characterized in that: The angle between the extension direction of the left knife main edge (134) and the length direction of the left knife rod (11) is 86°-88°; The angle between the extension direction of the right main blade (234) and the length direction of the right blade rod (21) is 86°-88°.

7. The dovetail groove tool according to claim 1, characterized in that: The included angle between the left knife first auxiliary edge (135) and the left knife main edge (134) is equal to the included angle between the right side wall and the bottom wall of the dovetail groove; The included angle between the first auxiliary edge (235) of the right knife and the main edge (234) of the right knife is equal to the included angle between the left side wall and the bottom wall of the dovetail groove.

8. The dovetail groove tool according to claim 1, characterized in that: The angle between the second auxiliary edge (136) of the left knife and the main edge (134) of the left knife is 99°-100°; The included angle between the second auxiliary edge (236) of the right knife and the main edge (234) of the right knife is 99°-100°.

9. The dovetail groove tool according to any one of claims 1 to 8, characterized in that: The height of the left cutter head (13) is greater than the depth of the dovetail groove; The height of the right cutter head (23) is greater than the depth of the dovetail groove.

10. A method for processing a dovetail groove, characterized in that: A dovetail groove cutting tool according to any one of claims 1 to 9 is used to process a workpiece, wherein the dovetail groove processing method comprises the following steps: S1, machining a straight groove on the workpiece, and making the width of the straight groove larger than the width of the left-hand knife and the right-hand knife and smaller than the width of the dovetail groove; and making the depth of the straight groove smaller than the depth of the dovetail groove; S2. Use the left-hand tool to perform axial cutting and radial cutting on the right side wall of the straight groove, and use the right-hand tool to perform axial cutting and radial cutting on the left side wall of the straight groove.

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