Rotor core skew rotation forming process

Abstract

The invention discloses a rotor core skew rotation forming process which comprises the following steps: conveying a raw material sheet to a first station, stamping to form a wire slot, rotating an upper die of the station by a set angle every time the station is stamped, conveying the raw material sheet to a second station, stamping to form a buckling point, conveying the raw material sheet to a third station, and stamping to form a center hole. The raw material sheets are conveyed to a fourth station, the rotor punching sheets are obtained through punching and blanking, the rotor punching sheets fall into a blanking groove, after each rotor punching sheet falls into the blanking groove, the blanking groove rotates by a set angle, and the rotor punching sheets are laminated in the blanking groove to obtain the rotor iron core. The harmonic torque is effectively reduced, the magnetic field distribution of the motor is optimized, the efficiency of the motor is improved, and the circumferential angles of the rotor punching sheets are different due to the rotation of the blanking grooves during blanking, so that the error superposition of the same area of the rotor punching sheets is avoided, and the uniformity and the performance of a rotor iron core are improved.

Description

Technical Field

[0001] The invention relates to the field of rotor cores, and in particular to a skew rotation forming process for rotor cores. Background Art

[0002] The rotor core is a key component of the motor rotor. It is usually made of materials with high magnetic conductivity, generally stacked silicon steel sheets. There is an insulating coating on the surface of the silicon steel sheets, which can reduce eddy current losses in the core. Its function is to provide a good path for the motor's magnetic field and support the rotor winding.

[0003] In the actual production process, the rotor core is mainly formed by stacking several rotor punchings. Since there will be differences in errors in different areas of the rotor punchings during production, once all the rotor punchings are stacked, the errors in the same area will accumulate and superimpose, resulting in poor uniformity of the rotor core, which will ultimately affect the performance of the rotor core and needs further improvement. Summary of the invention

[0004] In order to further improve uniformity and performance, the present application provides a rotor core skew rotation forming process.

[0005] The present application provides a rotor core skew rotation forming process, which adopts the following technical solution: A rotor core skew rotation forming process, characterized in that it comprises the following steps: S1, the raw material sheet is transported to the first station, and the wire groove is formed by punching. The upper die of the station rotates a set angle after each punching; S2, the raw material sheet is transported to the second station and punched to form buckle points; S3, the raw material sheet is transported to the third station and punched to form a center hole; S4, the raw material sheet is transported to the fourth station, punched and blanked to obtain rotor punchings, and the rotor punchings fall into the blanking chute; S5, after each rotor punch falls into the blanking chute, the blanking chute rotates by a set angle; S6, the rotor punching sheets are stacked in the blanking trough to obtain the rotor core.

[0006] Optionally, in step S1, the upper mold rotates at an angle of 6° each time.

[0007] Optionally, in step S5, the angle of each rotation of the blanking chute is 120°.

[0008] Optionally, in step S5, a blanking rotary mechanism is used to receive the rotor punching sheet, and the blanking rotary mechanism includes a die base, a rotating sleeve and a die, the blanking groove is opened on the die, the rotating sleeve is rotatably connected to the die base, the die base is provided with a driving assembly for driving the rotating sleeve to rotate, and the die is connected to the rotating sleeve.

[0009] Optionally, the driving assembly includes a driving motor, a worm wheel and a worm, the worm wheel is mounted on a rotating sleeve, the worm is meshed with the worm wheel, and the driving motor drives the worm to rotate.

[0010] Optionally, a positioning sleeve is provided under the die, the inner diameter of the positioning sleeve is consistent with the inner diameter of the blanking trough, a lifting cylinder is provided at the bottom of the rotating sleeve, a lifting plate is provided at the output end of the lifting cylinder, the lifting cylinder drives the lifting plate to rise and fall, and the lifting plate is used to receive the rotor punching sheet.

[0011] Optionally, corresponding connecting holes are provided on the rotating sleeve and the die, and connecting pins for connecting the two are inserted into the connecting holes.

[0012] Optionally, a vertical rod is vertically slidably connected in the connecting hole on the rotating sleeve, and a driving rod is vertically slidably connected to the inner wall of the rotating sleeve. The driving rod has a driving end, and the driving end is located on the downward path of the lifting plate and is used to be pushed downward by the lifting plate. A linkage part is provided between the driving rod and the vertical rod to link the two to move in opposite directions, and the concave mold is horizontally slidably connected to the mold base.

[0013] Optionally, the linkage member includes a transmission gear, which is rotatably connected to the rotating sleeve, and one side of the drive rod and the vertical rod has a rack meshing with the transmission gear, and the racks of the drive rod and the vertical rod are respectively meshed on both sides of the transmission gear.

[0014] Optionally, a magnet block is embedded on the vertical rod, and an electromagnet for adsorbing the magnet block is embedded on the rotating sleeve. When the electromagnet adsorbs the magnet block, the connecting pin is in a state of being out of the connecting hole on the rotating sleeve.

[0015] In summary, the present application includes at least one of the following beneficial technical effects: 1. The side wall slots of the rotor core formed by the above forming process are inclined, which effectively reduces the harmonic torque, optimizes the magnetic field distribution of the motor, improves the motor efficiency, and realizes the one-time forming of the skewed rotor core. In addition, the circumferential angle of each rotor punching sheet is different through the rotation of the blanking trough during blanking, thereby avoiding the phenomenon of error superposition in the same area of ​​the rotor punching sheet, effectively improving the uniformity of the rotor core, and improving the performance of the rotor core; 2. The design of the lifting cylinder and the lifting plate allows the lifting plate to receive the rotor punching well in the blanking trough, and the lifting plate will continue to drop as the thickness of the rotor punching increases, thus improving the stability of the rotor punching blanking; 3. The connection between the rotating sleeve and the die is detachable. In actual production, it can be adjusted as needed whether the blanking trough of the die needs to be rotated to improve practicality. After completing the blanking of a rotor core sheet, the lifting plate descends to drive the driving rod downward, which in turn drives the vertical rod upward to push the connecting pin upward. The connecting pin is disengaged from the connecting hole of the rotating sleeve, and the die is pushed horizontally to dislocate the blanking trough and the rotating sleeve. At this time, the lifting cylinder drives the lifting plate upward to further punch the stacked rotor sheets for press-fitting, thereby improving the connection firmness of adjacent rotor sheets and ultimately improving the stability of the rotor core. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a flow chart of an embodiment of the present application.

[0017] Figure 2 It is a schematic diagram of the stamping sequence of the raw material sheet in the embodiment of the present application.

[0018] Figure 3 It is a structural diagram of the blanking rotary mechanism in the embodiment of the present application.

[0019] Description of reference numerals: 1. Raw material sheet; 2. First station; 3. Wire groove; 4. Second station; 5. Buckle point; 6. Third station; 7. Center hole; 8. Fourth station; 9. Rotor punch; 10. Blanking rotary mechanism; 11. Blanking trough; 12. Die base; 13. Rotating sleeve; 14. Die; 15. Mounting groove; 16. Positioning sleeve; 17. Connecting pin; 18. Connecting hole; 19. Worm; 20. Worm wheel; 21. Lifting cylinder; 22. Lifting plate; 23. Slide; 24. Vertical rod; 25. Drive rod; 26. Transmission gear; 27. Rack; 28. Magnet block; 29. ​​Electromagnet; 30. Reset spring. DETAILED DESCRIPTION

[0020] The following is combined with Figure 1-3 This application is described in further detail.

[0021] A rotor core skew rotation forming process, such as Figure 1-Figure 3 As shown, it mainly includes the following steps: S1, when the raw material sheet 1 is conveyed to the first station 2, a wire groove 3 is formed on the raw material sheet 1 by means of up and down punching, and the upper die of the stamping die at the first station 2 rotates a set angle each time it punches. The angle set in this embodiment is 6°. In this way, as the raw material sheet 1 is continuously conveyed forward, multiple punchings are performed at the first station 2 to form a plurality of continuous wire grooves 3 with a certain angle of twist.

[0022] S2, when the raw material sheet 1 is conveyed to the second workstation 4, buckle points 5 are formed on the raw material sheet 1 by means of upper and lower punching. This workstation does not punch through the raw material sheet 1 during punching, but instead punches the raw material sheet 1 down at the punching position to form buckle points 5 on the bottom surface of the raw material sheet 1 and concave points on the top surface of the raw material sheet 1. During subsequent stacking, the buckle points 5 and concave points of the upper and lower punching sheets can be buckled together to achieve connection and fixation.

[0023] S3, the raw material sheet 1 is conveyed to the third station 6, and a center hole 7 is formed on the raw material sheet 1 by means of up and down punching, and the center hole 7 penetrates the raw material sheet 1.

[0024] S4, the raw material sheet 1 is transported to the fourth station 8, and is punched and blanked by up and down punching to obtain a rotor punching sheet 9, and the rotor punching sheet 9 falls into the blanking trough 11 of the blanking rotary mechanism 10.

[0025] S5, when each rotor punching sheet 9 falls into the blanking chute 11, the blanking chute 11 rotates by a set angle to achieve rotation. In this embodiment, the angle of each rotation of the blanking chute 11 is 120°.

[0026] S6, the rotor punching sheets 9 are stacked in the blanking trough 11 to obtain the rotor core.

[0027] The side wall grooves 3 of the rotor core formed by the above-mentioned forming process are inclined, which effectively reduces the harmonic torque, optimizes the magnetic field distribution of the motor, improves the motor efficiency, and realizes the one-time forming of the skewed rotor core. In addition, the circumferential angle of each rotor punching sheet 9 is different through the rotation of the blanking trough 11 during blanking, thereby avoiding the error superposition phenomenon of the same area of ​​the rotor punching sheet 9, effectively improving the uniformity of the rotor core, and improving the performance of the rotor core.

[0028] like Figure 3 As shown, the blanking rotary mechanism 10 includes a die base 12, a rotating sleeve 13 and a die 14. The rotating sleeve 13 is rotatably connected to the center position of the die base 12. The center of the die base 12 has an installation groove 15 for installing the rotating sleeve 13. The interior of the rotating sleeve 13 is hollow. The die 14 is arranged above the die base 12. The blanking trough 11 is opened in the center of the die 14. After the rotor punching 9 falls into the blanking trough 11, it is circumferentially linked with it, that is, the rotation of the blanking trough 11 drives the rotor punching 9 inside it to rotate synchronously. A positioning sleeve 16 is embedded in the rotating sleeve 13. The positioning sleeve 16 is colinearly arranged with the center of the blanking trough 11, and the inner diameter of the positioning sleeve 16 is consistent with the inner diameter of the blanking trough 11. As the rotor punching 9 continues to fall into the blanking trough 11, the rotor punching 9 will gradually fall into the positioning sleeve 16. The positioning sleeve 16 is used to position the rotor punching 9 to ensure that the rotor punching 9 is stably stacked vertically.

[0029] like Figure 3As shown, a connecting pin 17 connecting the two is provided between the die 14 and the rotating sleeve 13. The connecting pin 17 is vertically arranged. In this embodiment, the connecting pin 17 adopts a connecting bolt. Corresponding connecting holes 18 are provided on the die 14 and the rotating sleeve 13. When the connecting pin 17 is placed in the connecting hole 18, the two ends of the connecting pin 17 connect the die 14 and the rotating sleeve 13 to achieve circumferential linkage. In addition, a driving assembly for driving the rotating sleeve 13 to rotate is provided on the die base 12. The driving assembly includes a driving motor, a worm gear 20 and a worm 19. The worm The wheel 20 is fixedly mounted on the rotating sleeve 13, the worm 19 is meshed with the worm wheel 20, the driving motor drives the worm 19 to rotate, and the transmission of the worm wheel 20 is used to drive the rotating sleeve 13 to rotate. The rotation of the rotating sleeve 13 drives the die 14 to rotate to realize the circumferential rotation of the blanking trough 11. After each rotor punching 9 is punched by the fourth station 8 and falls into the blanking trough 11, the driving component drives the blanking trough 11 to rotate 120 degrees, so as to avoid the error superposition phenomenon of the same area of ​​the rotor punching 9, effectively improve the uniformity of the rotor core, and improve the performance of the rotor core.

[0030] like Figure 3 As shown, a lifting cylinder 21 is arranged at the bottom of the mounting groove 15 of the die base 12. The lifting cylinder 21 is arranged vertically and a lifting plate 22 is fixedly arranged at its output end. The outer diameter of the lifting plate 22 is consistent with the aperture of the positioning sleeve 16 and the blanking groove 11. The lifting plate 22 is driven to lift vertically by the lifting cylinder 21. In actual use, the lifting plate 22 mainly receives the falling rotor punchings 9. As the stacking height of the rotor punchings 9 gradually increases, the lifting plate 22 gradually descends to avoid the situation where the rotor punchings 9 fall to a large height when being blanked, thereby improving the stability of the blanking of the rotor punchings 9.

[0031] like Figure 3As shown, a slide groove 23 connected to the connection hole 18 of the rotating sleeve 13 is provided at the bottom thereof, a vertical rod 24 is vertically slidably connected in the slide groove 23, a driving rod 25 is vertically slidably connected on the inner wall of the rotating sleeve 13, and a linkage member for transmitting the reverse movement of the vertical rod 24 and the driving rod 25 is provided between the vertical rod 24 and the driving rod 25. In this embodiment, the linkage member includes a transmission gear 26 and a rack 27, the transmission gear 26 is rotatably connected to the rotating sleeve 13, the rack 27 is respectively provided on one side of the vertical rod 24 and the driving rod 25, and the racks 27 on the vertical rod 24 and the driving rod 25 are respectively meshed. On the opposite sides of the transmission gear 26, the linkage of the vertical rod 24 and the driving rod 25 in opposite directions is realized. In other embodiments, the linkage member can also be a connecting rod, the middle part of the connecting rod is rotatably connected to the rotating sleeve 13, and the two ends of the connecting rod are respectively movably hinged with the ends of the vertical rod 24 and the driving rod 25; the side of the driving rod 25 facing away from the rack 27 protrudes from the inner wall of the rotating sleeve 13 to form a driving end, and the driving end is located on the downward movement path of the lifting plate 22. In this way, in actual use, as the rotor punchings 9 are continuously stacked on the lifting plate 22, the lifting plate 22 is continuously lowered. After the rotor punchings 9 of the rotor core are stacked, the lifting plate 22 continues to descend, the lifting plate 22 pushes the driving rod 25 downward and then links the vertical rod 24 to move upward, the vertical rod 24 pushes the connecting pin 17 upward, so that the connecting pin 17 is disconnected from the rotating sleeve 13, at this time, the die 14 and the rotating sleeve 13 are no longer circumferentially linked, and in this embodiment, the die 14 is horizontally slidably connected to the die base 12, and the die base 12 has a guide groove for the horizontal sliding of the die 14, and the horizontal movement of the die 14 can be driven by a hydraulic cylinder. The die 14 removes other parts of the blanking trough 11. The position is a solid plate body. At this time, the die 14 is driven horizontally to move horizontally until the blanking groove 11 and the positioning sleeve 16 are in a misaligned state. At this time, the plate body of other parts of the die 14 covers the top of the positioning sleeve 16, and then the lifting plate 22 is driven to move up with the help of the lifting cylinder 21 to drive the stacked rotor punchings 9 to move up, so that the stacked rotor punchings 9 are pressed against the plate body of the die 14 to achieve further press-fitting and fixing, so that the connection between adjacent rotor punchings 9 is better. In this way, the blanking rotary mechanism 10 has the function of receiving materials while taking into account the pressing function, and is more practical.

[0032] like Figure 3 As shown, a magnet block 28 is embedded on the vertical rod 24, and an electromagnet 29 is embedded on the inner wall of the slide groove 23 corresponding to the rotating sleeve 13. The electromagnet 29 is used to attract the magnet block 28 to lock the position of the vertical rod 24. When the magnet block 28 and the electromagnet 29 are in corresponding positions, the connecting pin 17 is pushed up by the vertical rod 24 to be disconnected from the rotating sleeve 13. In this way, the rotating sleeve 13 and the die 14 can always be kept in a state of circumferential non-coupling. It is still applicable when some rotor cores do not need the blanking trough 11 to be produced for circumferential rotation, and has better applicability.

[0033] like Figure 3As shown, a reset spring 30 for resetting is provided at the bottom of the slide groove 23, one end of the reset spring 30 is fixed to the bottom end of the vertical rod 24, and the other end is fixed to the bottom wall of the slide groove 23. The reset spring 30 is used to drive the vertical rod 24 to move and reset. When the vertical rod 24 moves upward under the action of the downward movement of the lifting plate 22, the reset spring 30 is in a stretched state. Subsequently, when the lifting plate 22 moves upward, the reset spring 30 can drive the vertical rod 24 to reset to its initial state.

[0034] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A rotor core skew rotation forming process, characterized in that: The following steps are involved: S1, a raw material sheet (1) is transported to a first station (2), and a wire groove (3) is formed by punching, and the upper die of the station rotates by a set angle each time punching is performed; S2, the raw material sheet (1) is transported to the second station (4) and punched to form buckle points (5); S3, the raw material sheet (1) is transported to the third station (6) and punched to form a center hole (7); S4, the raw material sheet (1) is transported to the fourth station (8), punched and blanked to obtain a rotor punch (9), and the rotor punch (9) falls into a blanking trough (11); S5, after each rotor punching sheet (9) falls into the material drop chute (11), the material drop chute (11) rotates by a set angle; S6, the rotor punching sheets (9) are stacked in the blanking trough (11) to obtain a rotor core.

2. A rotor core skew rotation forming process according to claim 1, characterized in that: In step S1, the upper mold rotates by 6° each time.

3. A rotor core skew rotation forming process according to claim 2, characterized in that: In step S5, the angle of each rotation of the blanking chute (11) is 120°.

4. The rotor core skew rotation forming process according to claim 1, characterized in that: In step S5, a blanking rotary mechanism (10) is used to receive the rotor punching sheet (9), the blanking rotary mechanism (10) comprises a die base (12), a rotating sleeve (13) and a die (14), the blanking trough (11) is provided on the die (14), the rotating sleeve (13) is rotatably connected to the die base (12), the die base (12) is provided with a driving component for driving the rotating sleeve (13) to rotate, and the die (14) is connected to the rotating sleeve (13).

5. A rotor core skew rotation forming process according to claim 4, characterized in that: The driving assembly comprises a driving motor, a worm wheel (20) and a worm (19); the worm wheel (20) is mounted on a rotating sleeve (13); the worm (19) is meshed with the worm wheel (20); and the driving motor drives the worm (19) to rotate.

6. A rotor core skew rotation forming process according to claim 4, characterized in that: A positioning sleeve (16) is arranged below the die (14), and the inner diameter of the positioning sleeve (16) is consistent with the inner diameter of the blanking trough (11). A lifting cylinder (21) is arranged at the bottom of the rotating sleeve (13), and a lifting plate (22) is arranged at the output end of the lifting cylinder (21). The lifting cylinder (21) drives the lifting plate (22) to rise and fall, and the lifting plate (22) is used to receive the rotor punching sheet (9).

7. A rotor core skew rotation forming process according to claim 6, characterized in that: The rotating sleeve (13) and the concave mold (14) are provided with corresponding connecting holes (18), and a connecting pin (17) for connecting the two is inserted into the connecting hole (18).

8. The rotor core skew rotation forming process according to claim 7, characterized in that: A vertical rod (24) is vertically slidably connected in the connection hole (18) on the rotating sleeve (13), and a driving rod (25) is vertically slidably connected to the inner wall of the rotating sleeve (13). The driving rod (25) has a driving end, and the driving end is located on the downward movement path of the lifting plate (22) and is used to be pushed downward by the lifting plate (22). A linkage member is provided between the driving rod (25) and the vertical rod (24) for linking the two to move in opposite directions. The female mold (14) is horizontally slidably connected to the mold base (12).

9. A rotor core skew rotation forming process according to claim 8, characterized in that: The linkage member comprises a transmission gear (26) which is rotatably connected to the rotating sleeve (13); one side of the driving rod (25) and the vertical rod (24) has a rack (27) which meshes with the transmission gear (26); and the racks (27) of the driving rod (25) and the vertical rod (24) are respectively meshed with the two sides of the transmission gear (26).

10. The rotor core skew rotation forming process according to claim 9, characterized in that: A magnet block (28) is embedded on the vertical rod (24), and an electromagnet (29) for adsorbing the magnet block (28) is embedded on the rotating sleeve (13). When the electromagnet (29) adsorbs the magnet block (28), the connecting pin (17) is in a state of being out of the connecting hole (18) on the rotating sleeve (13).

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