Self-rotating cooling air milling cutter for dry cutting

Abstract

The invention discloses a self-rotating cooling air milling cutter for dry cutting, which relates to the technical field of machine tool tools, and comprises a milling cutter disc, a cutter body, a turbofan, a wheel set, a tail pipe, a guide cover and a vortex generator. The milling cutter disc has an internal flow channel, and the cutter body has a first central hole. The turbofan rotates synchronously with the cutter body. The wheel set comprises a rotor and a reverse turbine, the rotor rotates synchronously with the cutter body, and the reverse turbine is rotatably connected with the cutter body. The blades of the rotor and the reverse turbine rotate in opposite directions, and the rotor and the turbofan rotate in the same direction. The tail pipe is fixedly connected to the cutter body and has a blind hole facing the cutter body. An air inlet side hole is provided at one end of the blind hole close to the cutter body, and an air outlet side hole is provided at one end of the blind hole away from the cutter body. The guide cover is fixedly connected to the tail pipe, and the airflow is introduced into the blind hole through the air inlet side hole. The vortex generator is fixedly connected to the cutter body and extends into the blind hole. The vortex generator has a second central hole. The milling cutter of the invention can obtain a low-temperature airflow by using the kinetic energy of its own rotation, and achieve cooling of the cutting processing area by the low-temperature airflow.

Description

Technical Field

[0001] The invention relates to the technical field of machine tool cutting tools, in particular to a self-rotating cooling air cooling milling cutter for dry cutting. Background Art

[0002] In the field of aerospace, titanium alloys, high-temperature alloys and other tough and difficult-to-process metal materials, as well as high-temperature and erosion-resistant lightweight high-strength composite materials are widely used, including composite materials of different reinforcements such as carbon fiber, silicon carbide fiber, silicon carbide particles and different matrices such as resin-based, metal-based, and ceramic-based. However, due to the extremely low thermal conductivity and high chemical activity of difficult-to-process materials such as titanium alloys, high-temperature alloys, carbon fiber composites, and resin-based composites, cutting fluids cannot be used during the cutting process, resulting in the inability to dissipate heat. It is very easy to cause cutting deformation, microcracks and other defects caused by high cutting temperatures, which seriously affects the surface quality of the workpiece and greatly reduces the product forming rate. Summary of the invention

[0003] The purpose of the present invention is to provide a self-rotating cooling air milling cutter for dry cutting, so as to solve the problems existing in the above-mentioned related technologies and achieve cooling by using airflow.

[0004] To achieve the above object, the present invention provides the following solutions:

[0005] The invention discloses a self-rotating cooling air milling cutter for dry cutting, comprising:

[0006] A milling cutter disc for performing milling processing, wherein the milling cutter disc has an internal flow channel;

[0007] A cutter body fixedly connected to the milling cutter disc, wherein the cutter body has a first central hole communicating with the internal flow channel;

[0008] A turbofan mounted on the cutter body, the turbofan and the cutter body rotating synchronously;

[0009] A plurality of wheel groups are mounted on the cutter body, the wheel group comprising a rotor and a reverse turbine; the rotor is located on the side of the turbofan away from the milling cutter disc and rotates synchronously with the cutter body; the reverse turbine is located on the side of the rotor away from the milling cutter disc and is rotatably connected to the cutter body; the blades of the rotor and the reverse turbine have opposite rotation directions, and the rotor and the turbofan have the same rotation direction;

[0010] A tail pipe fixedly connected to the cutter body, the tail pipe is located on a side of the cutter body away from the milling cutter disc and has a blind hole opening toward the cutter body, the blind hole is connected to the first center hole; an air inlet side hole is provided at one end of the blind hole close to the cutter body, and an air outlet side hole is provided at one end of the blind hole away from the cutter body;

[0011] A fairing fixedly connected to the tail pipe, wherein the small-diameter end of the fairing is fixedly connected to the outer side of the tail pipe and is located between the air inlet side hole and the air outlet side hole, and the large-diameter end of the fairing is arranged on the outer side of the turbofan to guide the airflow through the air inlet side hole into the blind hole;

[0012] A vortex generator is fixedly connected to the tool body, one end of the vortex generator is fixedly connected to the end surface of the tool body facing away from the milling cutter disc, and the other end of the vortex generator extends into the blind hole, so that the gas entering the blind hole through the air inlet side hole forms an outer vortex and an inner vortex whose energy is consumed by the outer vortex; the vortex generator has a second center hole, and the two ends of the second center hole are respectively connected to the blind hole and the first center hole; the outer layer vortex is used to flow out through the air outlet side hole; the inner layer vortex is used to be forced to flow back by the bottom of the blind hole, and then flow out through the second center hole and the internal flow channel, and expand and cool down.

[0013] Preferably, the internal flow channel includes a central flow channel and a plurality of branch flow channels connected to the central flow channel; one end of the central flow channel is connected to the first center hole, and the other end of the central flow channel is connected to the branch flow channels; the plurality of branch flow channels are evenly distributed along the circumferential direction with the central flow channel as the center.

[0014] Preferably, the wheel group is arranged in two stages, namely a primary wheel group and a secondary wheel group, the primary wheel group is located on the side of the secondary wheel group close to the milling cutter disc; the primary wheel group includes a primary rotor and a primary reverse turbine, and the secondary wheel group includes a secondary rotor and a secondary reverse turbine.

[0015] Preferably, the turbofan and the first-stage rotor are both key-connected to the blade body, the second-stage rotor is welded to the blade body, and the first-stage reverse turbine and the second-stage reverse turbine are both rotatably connected to the blade body via bearings.

[0016] Preferably, the inner ring of the bearing corresponding to the second-stage reverse turbine is welded to the cutter body.

[0017] Preferably, the turbofan is separated from the first-stage rotor by a fixing ring, and the fixing ring is key-connected to the blade body; the first-stage rotor and the first-stage reverse turbine, the first-stage reverse turbine and the second-stage rotor, and the second-stage rotor and the second-stage reverse turbine are all separated by a retaining ring.

[0018] Preferably, a groove is provided on the end surface of the cutter body facing away from the milling cutter disc, and one end of the vortex generator is inserted into the groove and welded to the groove.

[0019] Preferably, the tail pipe has a plurality of the air inlet side holes and the air outlet side holes, the plurality of the air inlet side holes are evenly distributed along the circumferential direction of the tail pipe, and the plurality of the air outlet side holes are evenly distributed along the circumferential direction of the tail pipe.

[0020] Preferably, the small diameter end of the air guide cover is welded to the outer side surface of the tail pipe.

[0021] Preferably, the air guide cover is conical.

[0022] Compared with the related art, the present invention has achieved the following technical effects:

[0023] The self-rotating refrigerated air cooling milling cutter for dry cutting of the present invention can utilize the kinetic energy of its own rotation to obtain a low-temperature airflow, and realize cooling of the cutting processing area through the low-temperature airflow, thereby solving the problem of defects such as cutting deformation and micro cracks caused by the inability to use cutting fluid during the cutting process due to the low thermal conductivity and high high-temperature chemical activity of difficult-to-process materials such as titanium alloys, high-temperature alloys, carbon fiber composites, and resin-based composites. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or related technologies, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1a It is a schematic diagram of the overall structure assembly of a self-rotating cooling air milling cutter for dry cutting according to an embodiment of the present invention;

[0026] Figure 1b for Figure 1a Cross-sectional view along AA direction;

[0027] Figure 1c for Figure 1b A partial enlarged view of point Ⅰ in the middle;

[0028] Figure 2a It is a schematic diagram of the partial structure assembly of a self-rotating cooling air cooling milling cutter for dry cutting according to an embodiment of the present invention;

[0029] Figure 2b for Figure 2a Cross-sectional view along AA direction;

[0030] Figure 2c for Figure 2b A partial enlarged view of point Ⅰ in the middle;

[0031] Figure 2d for Figure 2b A partial enlarged view of the middle II;

[0032] Figure 3 The overall CFD simulation flow field distribution diagram of the self-rotating cooling air cooling milling cutter for dry cutting according to the embodiment of the present invention;

[0033] Figure 4 The overall CFD simulation temperature field distribution diagram of the self-rotating cooling air cooling milling cutter for dry cutting according to the embodiment of the present invention;

[0034] Figure 5 The contour distribution diagram of the temperature field of the whole CFD simulation of the self-rotating cooling air cooling milling cutter for dry cutting according to the embodiment of the present invention;

[0035] Figure 6 This is a CFD simulation flow field distribution diagram of the acceleration and pressurization zone of the self-rotating cooling air cooling milling cutter for dry cutting according to an embodiment of the present invention;

[0036] Figure 7 This is a CFD simulation dynamic pressure field distribution diagram of the acceleration pressurization zone of the self-rotating cooling air cooling milling cutter for dry cutting according to an embodiment of the present invention;

[0037] Figure 8 This is a diagram showing the influence of the rotor and the reverse turbine of the self-rotating cooling air cooling milling cutter for dry cutting on the gas motion trajectory according to an embodiment of the present invention;

[0038] Fig. 9 It is the velocity curve of air in Z direction under two-stage compression;

[0039] Fig.10a is a schematic diagram of the structure of a first-stage rotor at a first-viewing angle;

[0040] Fig.10b is a structural schematic diagram of a first-stage rotor at a second viewing angle;

[0041] Fig.10c It is a schematic diagram of the structure of the first-stage rotor from a third perspective;

[0042] Fig.11a It is a schematic diagram of the structure of a first-stage reverse turbine from the first perspective;

[0043] Fig.11b It is a schematic diagram of the structure of the first-stage reverse turbine at the second viewing angle;

[0044] Fig.12a is a schematic diagram of the structure of the secondary rotor at the first perspective;

[0045] Figure 12b is a structural schematic diagram of the secondary rotor at a second viewing angle;

[0046] Fig.12c It is a schematic diagram of the structure of the secondary rotor from a third perspective;

[0047] Fig.13a It is a schematic diagram of the structure of the two-stage reverse turbine in the first perspective;

[0048] Fig.13b It is a schematic diagram of the structure of the two-stage reverse turbine at a second viewing angle;

[0049] Fig.14a is a schematic structural diagram of a vortex generator in a first perspective;

[0050] Fig.14b for Fig.16a Cross-sectional view along AA direction;

[0051] Fig.14c is a schematic structural diagram of the vortex generator at a second viewing angle;

[0052] Fig.14d It is a schematic diagram of the structure of the vortex generator in the third perspective;

[0053] Fig.15 A schematic diagram of a vortex generator generating vortex;

[0054] Fig.16a It is a schematic diagram of the structure of the knife body in the first perspective;

[0055] Fig.16b for Fig.18a Cross-sectional view along AA direction;

[0056] Fig.16c is a schematic diagram of the structure of the knife body at a second viewing angle;

[0057] Fig.16d It is a schematic diagram of the structure of the knife body in the third perspective;

[0058] Fig.17a It is a structural schematic diagram of the tailstock in the first perspective;

[0059] Fig.17b for Fig.17a Cross-sectional view along AA direction;

[0060] Fig.17c is a structural schematic diagram of the tailstock at a second viewing angle;

[0061] Fig.17d It is a structural schematic diagram of the tailstock in the third perspective;

[0062] Fig.18a It is a schematic diagram of the structure of the milling cutter disc in the first perspective;

[0063] Fig.18b for Fig.20a Cross-sectional view along AA direction;

[0064] Fig.18c is a schematic diagram of the structure of the milling cutter disc at a second viewing angle;

[0065] Fig.18d It is a schematic diagram of the structure of the milling cutter disc in the third perspective;

[0066] Fig.19a It is a schematic diagram of the structure of the turbofan at the first perspective;

[0067] Fig.19b is a schematic diagram of the structure of the turbofan at a second viewing angle;

[0068] Fig.19c It is a schematic diagram of the structure of the turbofan from a third-person perspective;

[0069] Fig.20a It is a schematic diagram of the fixed ring structure;

[0070] Fig.20b for Fig.22a Cross-sectional view along AA direction;

[0071] Fig.21a is a schematic diagram of the structure of the retaining ring in the first perspective;

[0072] Figure 21b for Fig.23a Cross-sectional view along AA direction;

[0073] Fig.21c is a schematic diagram of the structure of the retaining ring at a second viewing angle;

[0074] Fig.22a is a schematic diagram of the structure of the stepped retaining ring in the first perspective;

[0075] Figure 22b for Fig.22a Cross-sectional view along AA direction;

[0076] Fig.22c is a schematic diagram of the structure of the stepped retaining ring at a second viewing angle;

[0077] Fig.23a is a structural schematic diagram of a bearing;

[0078] Figure 23b for Fig.23a Cross-sectional view along the AA direction.

[0079] Explanation of the reference numerals: 1-cutter body; 2-turbofan; 3-first-stage rotor; 4-first-stage reverse turbine; 5-second-stage rotor; 6-second-stage reverse turbine; 7-vortex generator; 8-fixing ring; 9-retaining ring; 10-step retaining ring; 11-bearing; 12- fairing; 13-milling cutter disc; 14-tail pipe. DETAILED DESCRIPTION

[0080] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, 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.

[0081] The purpose of the present invention is to provide a self-rotating cooling air milling cutter for dry cutting, so as to solve the problems existing in the above-mentioned related technologies and achieve cooling by using airflow.

[0082] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0083] Reference Figure 1a to Figure 23b The present embodiment provides a self-rotating cooling air milling cutter for dry cutting, comprising a milling cutter disc 13, a cutter body 1, a turbofan 2, a wheel set, a tail pipe 14, a guide cover 12 and a vortex generator 7.

[0084] The milling disc 13 is used for milling processing, and the milling disc 13 has an internal flow channel. The cutter body 1 is fixedly connected to the milling disc 13, and the cutter body 1 has a first center hole connected to the internal flow channel. The turbofan 2 is installed on the cutter body 1, and the turbofan 2 rotates synchronously with the cutter body 1. Several stages of wheel groups are installed on the cutter body 1, and the wheel group includes a rotor and a reverse turbine. The rotor is located on the side of the turbofan 2 away from the milling disc 13, and rotates synchronously with the cutter body 1. The reverse turbine is located on the side of the rotor away from the milling disc 13, and is rotatably connected to the cutter body 1. The blades of the rotor and the reverse turbine have opposite rotation directions, and the rotor and the turbofan 2 have the same rotation direction. The tail pipe 14 is fixedly connected to the cutter body 1, and the tail pipe 14 is located on the side of the cutter body 1 away from the milling disc 13, and has a blind hole with an opening facing the cutter body 1, and the blind hole is connected to the first center hole. An air inlet side hole is provided at one end of the blind hole close to the cutter body 1, and an air outlet side hole is provided at one end of the blind hole away from the cutter body 1. The air guide 12 is fixedly connected to the tail pipe 14. The small diameter end of the air guide 12 is fixedly connected to the outer side of the tail pipe 14 and is located between the air intake side hole and the air outlet side hole. The large diameter end cover of the air guide 12 is arranged on the outside of the turbofan 2 to guide the air flow into the blind hole through the air intake side hole. The vortex generator 7 is fixedly connected to the cutter body 1. One end of the vortex generator 7 is fixedly connected to the end surface of the cutter body 1 away from the milling cutter disc 13, and the other end of the vortex generator 7 extends into the blind hole so that the gas entering the blind hole through the air intake side hole forms an outer vortex and an inner vortex whose energy is consumed by the outer vortex. The vortex generator 7 has a second center hole, and the two ends of the second center hole are connected to the blind hole and the first center hole respectively. The outer vortex is used to flow out through the air outlet side hole. The inner vortex is used to be forced to flow back at the bottom of the blind hole, and then flow out through the second center hole and the internal flow channel, and expand and cool down.

[0085] The working principle of the self-rotating cooling air cooling milling cutter for dry cutting in this embodiment is as follows:

[0086] The turbofan 2 and the rotor rotate together with the blade body 1, and work together with the air deflector 12 to compress the air, drive the air to rotate, and accelerate the air. Under the action of wind, the reverse turbine rotates at a low speed in the same direction relative to the rotor, or rotates in the opposite direction, or is stationary, to slow down the rotation of the air in exchange for a higher air pressure. Therefore, an acceleration pressurization zone is formed on the inner side of the air deflector 12, generating a high-speed and high-pressure airflow, which enters the blind hole of the tail pipe 14 from the air inlet side hole. The gas entering the blind hole forms a vortex under the action of the vortex generator 7, and the vortex includes an inner vortex and an outer vortex. The kinetic energy of the inner vortex is greater than that of the outer vortex. The inner and outer vortices transfer energy, so that the internal energy of the inner vortex is consumed by the outer vortex, resulting in a decrease in the temperature of the inner vortex, and the outer vortex is discharged from the air outlet side hole after absorbing the energy of the inner vortex. After the inner eddy current is forced to flow back by the bottom of the blind hole, it flows out through the second center hole and the internal flow channel, expands and cools down, and acts on the cutting processing area to achieve cooling of the cutting processing area.

[0087] Therefore, the self-rotating cooling air cooling milling cutter for dry cutting in this embodiment can use the kinetic energy of its own rotation to obtain low-temperature airflow, and realize cooling of the cutting processing area through the low-temperature airflow, thereby solving the problem of cutting deformation, microcracks and other defects caused by the inability to use cutting fluid during the cutting process due to the low thermal conductivity and high high-temperature chemical activity of difficult-to-process materials such as titanium alloys, high-temperature alloys, carbon fiber composites, and resin-based composites.

[0088] As a possible example, in this embodiment, the internal flow channel includes a central flow channel and a plurality of branch flow channels connected to the central flow channel. One end of the central flow channel is connected to the first central hole, and the other end of the central flow channel is connected to the branch flow channel. The plurality of branch flow channels are evenly distributed along the circumferential direction with the central flow channel as the center. The low-temperature airflow flows out through the plurality of branch flow channels, thereby achieving uniform blowing and cooling of the cutting processing area in the circumferential direction of the milling cutter disc 13.

[0089] As a possible example, in this embodiment, the wheel set is provided with two stages, namely, a primary wheel set and a secondary wheel set, and the primary wheel set is located on the side of the secondary wheel set close to the milling cutter disc 13. The primary wheel set includes a primary rotor 3 and a primary reverse turbine 4, and the secondary wheel set includes a secondary rotor 5 and a secondary reverse turbine 6. According to different actual needs, those skilled in the art may also select other numbers of wheel sets.

[0090] As a possible example, in this embodiment, the turbofan 2 and the first-stage rotor 3 are key-connected to the blade body 1, and the second-stage rotor 5 is welded to the blade body 1. Specifically, an inner spline is provided on the inner side of the turbofan 2 and the first-stage rotor 3, and an outer spline is provided on the outer side of the blade body 1, and the key connection of the turbofan 2, the first-stage rotor 3 and the blade body 1 is achieved by the cooperation of the inner spline and the outer spline. The second-stage rotor 5 and the blade body 1 are first installed by interference fit, and then connected by welding. The first-stage anti-turbine 4 and the second-stage anti-turbine 6 are both interference fit with the outer ring of the corresponding bearing 11, and the inner ring of the corresponding bearing 11 is both interference fit with the blade body 1.

[0091] As a possible example, in this embodiment, the inner ring of the bearing 11 corresponding to the second-stage reverse turbine 6 is welded to the cutter body 1 to achieve axial positioning. On the side of the turbofan 2 close to the milling cutter disc 13, the turbofan 2 is limited by a shaft shoulder set on the cutter body 1. Therefore, the turbofan 2, the first-stage rotor 3, the first-stage reverse turbine 4, and the second-stage rotor 5 are limited in the middle by the shaft shoulder of the cutter body 1 and the bearing 11 corresponding to the second-stage reverse turbine 6.

[0092] As a possible example, in this embodiment, the turbofan 2 is separated from the first-stage rotor 3 by a fixing ring 8, and the fixing ring 8 is key-connected to the blade body 1. The first-stage rotor 3 is separated from the first-stage reverse turbine 4, the first-stage reverse turbine 4 is separated from the second-stage rotor 5, and the second-stage rotor 5 is separated from the second-stage reverse turbine 6 by a retaining ring.

[0093] The retaining ring between the secondary rotor 5 and the secondary reverse turbine 6 is a stepped retaining ring 10 , and the retaining rings between the primary rotor 3 and the primary reverse turbine 4 , and between the primary reverse turbine 4 and the secondary rotor 5 are common retaining rings 9 .

[0094] As a possible example, in this embodiment, a groove is provided on the end surface of the cutter body 1 facing away from the milling cutter disc 13, and one end of the vortex generator 7 is inserted into the groove and welded to the groove. By combining the plug connection with the welding connection, the firmness of the connection position between the cutter body 1 and the vortex generator 7 is improved to prevent the two from being separated.

[0095] As a possible example, in this embodiment, the tail pipe 14 has multiple air intake side holes and air outlet side holes, and the multiple air intake side holes are evenly distributed along the circumferential direction of the tail pipe 14, and the multiple air outlet side holes are evenly distributed along the circumferential direction of the tail pipe 14 to achieve uniform air intake and outlet in the circumferential direction of the tail pipe 14.

[0096] As a possible example, in this embodiment, the small diameter end of the air deflector 12 is welded to the outer side of the tail pipe 14. The air deflector 12 may be in a conical, pyramidal or other shape, as long as the cross-sectional area of ​​the inner region thereof decreases gradually or in a stepped manner or in a combination of the two from the end close to the milling cutter disc 13 to the end away from the milling cutter disc 13.

[0097] It is to be understood that the specific connection method is illustrated in this embodiment, and the actual implementation is not limited thereto. For example, the welding connection can be replaced by a screw fixing connection.

[0098] In the above structure, according to different functions, the airflow area inside the air guide cover 12 is called the acceleration and pressurization area, the airflow area in the blind hole of the tail pipe 14 is called the vortex generation area, and the airflow area in the internal flow channel of the milling cutter disc 13 is called the cold flow recirculation area. In order to more clearly illustrate the technical effect of this embodiment, it is described in detail below in conjunction with the CFD simulation drawings.

[0099] like Figure 6 , Figure 8 As shown: after the air enters the acceleration and pressurization zone, under the action of the first-stage rotor 3, the first-stage anti-turbine 4, the second-stage rotor 5, and the second-stage anti-turbine 6, the flow direction is: rotation-anti-rotation-rotation-anti-rotation, which accelerates and pressurizes the air.

[0100] like Figure 7 , Fig. 9 As shown: after two-stage compression, the air speed increases from 0 to 2.51 m / s, and the dynamic pressure increases to 155 Pa. This indicates that the first-stage rotor 3, the first-stage anti-turbine 4, the second-stage rotor 5, and the second-stage anti-turbine 6 are all effective.

[0101] like Figure 3 to Figure 5 As shown: The simulation results show that after the air passes through the acceleration and pressurization area, it enters the vortex generating area from the tailstock air inlet and rotates under the action of the vortex generator 7, so that the air is stratified, the hot and cold fluids are separated, the outer fluid flows out from the exhaust port, and the cold fluid gathers inside and flows back to the milling cutter disc 13, and flows out through the internal flow channel of the milling cutter disc 13. The temperature field results show that the lowest air flow temperature is 279.366K, which is much lower than the room temperature of 293.15K. It shows that the structure is effective and the self-rotating cooling air cooling milling cutter for dry cutting has excellent cooling ability.

[0102] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A self-rotating cooling air milling cutter for dry cutting, characterized in that: include: A milling cutter disc for performing milling processing, wherein the milling cutter disc has an internal flow channel; A cutter body fixedly connected to the milling cutter disc, wherein the cutter body has a first central hole communicating with the internal flow channel; A turbofan mounted on the cutter body, the turbofan and the cutter body rotating synchronously; A plurality of wheel groups are mounted on the cutter body, wherein the wheel group includes a rotor and a reverse turbine; the rotor is located on the side of the turbofan away from the milling cutter disc and rotates synchronously with the cutter body; The reverse turbine is located on the side of the rotor away from the milling cutter disc and is rotatably connected to the cutter body; the blades of the rotor and the reverse turbine have opposite rotation directions, and the rotor has the same rotation direction as the turbofan; A tail pipe fixedly connected to the cutter body, the tail pipe is located at a side of the cutter body away from the milling cutter disc and has a blind hole opening toward the cutter body, the blind hole being connected to the first center hole; An air inlet side hole is provided at one end of the blind hole close to the knife body, and an air outlet side hole is provided at one end of the blind hole away from the knife body; A fairing fixedly connected to the tail pipe, wherein the small-diameter end of the fairing is fixedly connected to the outer side of the tail pipe and is located between the air inlet side hole and the air outlet side hole, and the large-diameter end of the fairing is arranged on the outer side of the turbofan to guide the airflow through the air inlet side hole into the blind hole; A vortex generator is fixedly connected to the tool body, one end of the vortex generator is fixedly connected to the end surface of the tool body facing away from the milling cutter disc, and the other end of the vortex generator extends into the blind hole, so that the gas entering the blind hole through the air inlet side hole forms an outer vortex and an inner vortex whose energy is consumed by the outer vortex; the vortex generator has a second center hole, and the two ends of the second center hole are respectively connected to the blind hole and the first center hole; the outer layer vortex is used to flow out through the air outlet side hole; the inner layer vortex is used to be forced to flow back by the bottom of the blind hole, and then flow out through the second center hole and the internal flow channel, and expand and cool down.

2. The self-rotating cooling air milling cutter for dry cutting according to claim 1, characterized in that: The internal flow channel includes a central flow channel and a plurality of branch flow channels connected to the central flow channel; one end of the central flow channel is connected to the first center hole, and the other end of the central flow channel is connected to the branch flow channels; the plurality of branch flow channels are evenly distributed along the circumferential direction with the central flow channel as the center.

3. The self-rotating cooling air milling cutter for dry cutting according to claim 1, characterized in that: The wheel set is arranged in two stages, namely a primary wheel set and a secondary wheel set. The primary wheel set is located on the side of the secondary wheel set close to the milling cutter disc; the primary wheel set includes a primary rotor and a primary reverse turbine, and the secondary wheel set includes a secondary rotor and a secondary reverse turbine.

4. The self-rotating cooling air milling cutter for dry cutting according to claim 3, characterized in that: The turbofan and the first-stage rotor are both connected to the blade body with a key, the second-stage rotor is connected to the blade body by welding, and the first-stage reverse turbine and the second-stage reverse turbine are both rotatably connected to the blade body via bearings.

5. The self-rotating cooling air milling cutter for dry cutting according to claim 4, characterized in that: The inner ring of the bearing corresponding to the second-stage reverse turbine is welded to the cutter body.

6. The self-rotating cooling air milling cutter for dry cutting according to claim 3, characterized in that: The turbofan is separated from the first-stage rotor by a fixing ring, and the fixing ring is key-connected to the blade body; the first-stage rotor is separated from the first-stage reverse turbine, the first-stage reverse turbine is separated from the second-stage rotor, and the second-stage rotor is separated from the second-stage reverse turbine by a retaining ring.

7. The self-rotating cooling air milling cutter for dry cutting according to claim 1, characterized in that: The end surface of the cutter body facing away from the milling cutter disc is provided with a groove, and one end of the vortex generator is inserted into the groove and welded to the groove.

8. The self-rotating cooling air milling cutter for dry cutting according to claim 1, characterized in that: The tail pipe has a plurality of the air inlet side holes and the air outlet side holes, the plurality of the air inlet side holes are evenly distributed along the circumferential direction of the tail pipe, and the plurality of the air outlet side holes are evenly distributed along the circumferential direction of the tail pipe.

9. The self-rotating cooling air milling cutter for dry cutting according to claim 1, characterized in that: The small diameter end of the air deflector is welded to the outer side surface of the tail pipe.

10. The self-rotating cooling air milling cutter for dry cutting according to claim 1, characterized in that: The deflector is conical.

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