A magnetic core of a chip common mode inductor and its preparation process

Abstract

The present invention discloses a magnetic core of a patch common-mode inductor and a preparation process thereof, comprising: adding powder into a mold of a stamping device, then pressing the overall large-scale structure of the magnetic core through the mold, then processing the pressed magnetic core through a multifunctional processing machine to process it into a green semi-finished product according to the final product shape and structure, then sintering it at high temperature to complete the production of the semi-finished product, and finally subjecting the sintered magnetic core to silver dipping and silver baking treatments, and then electroplating nickel and tin to form an electrode layer to obtain a finished magnetic core with completed electrode metallization.

Description

Technical Field

[0001] The present invention relates to the technical field of magnetic cores, and more particularly to a magnetic core of a chip common-mode inductor and a preparation process thereof. Background Art

[0002] An inductor is an energy storage element, and one of its core components is the magnetic core. The current method for common-mode inductor cores involves creating winding slots and electrodes on the upper and lower molds of a die, then pressing the core material into shape. During the pressing process, the pressure distribution at the center column and the pressure distribution along the two side lobes are inconsistent, with pressure primarily concentrated on the center column. The density distribution between the center column and the two side lobes is uneven, particularly at the eight electrode pads. This can lead to a loose core, reducing the reliability of the subsequent inductor, resulting in low thrust test values ​​and the finished inductor falling off during a drop test on a PCB. Therefore, it is necessary to propose a common-mode inductor core and preparation process to at least partially address the problems existing in the prior art. Summary of the Invention

[0003] The Summary of the Invention introduces a series of simplified concepts that will be further described in the Detailed Description of the Invention. The Summary of the Invention is not intended to limit the key features and essential features of the claimed technical solution, nor is it intended to determine the scope of protection of the claimed technical solution.

[0004] To at least partially solve the above problems, the present invention provides a process for preparing a magnetic core of a chip common-mode inductor, comprising:

[0005] Step 1: Add powder to the mold of the stamping device and use the mold to press out the overall large-scale structure of the magnetic core;

[0006] Step 2: The pressed magnetic core is processed by a multifunctional processing machine and processed into a green semi-finished product according to the final shape and structure of the product;

[0007] Step 3: After high-temperature sintering, the semi-finished product is completed;

[0008] Step 4: After the sintered magnetic core is subjected to silver dipping and silver baking treatments, nickel and tin are electroplated to form an electrode layer to obtain a finished magnetic core with completed electrode metallization.

[0009] Preferably, the punching device comprises:

[0010] A base, a mounting seat is provided parallel to the top of the base, and the mounting seat is connected to the base via a plurality of columns;

[0011] A forming device is provided on the base.

[0012] Preferably, the forming device comprises: a hydraulic rod, the hydraulic rod is arranged on the mounting seat, a pressing plate is provided at the bottom end of the hydraulic rod, and the hydraulic rod is electrically connected to the controller;

[0013] A sliding sleeve, the sliding sleeve is sleeved on the column, and the outer wall of the sliding sleeve is connected to the pressing plate;

[0014] An upper die base, the top of which is arranged at the bottom of the pressing plate, and a plurality of punching blocks are evenly arranged at the bottom of the upper die base;

[0015] The lower die seat is arranged in the base, and a plurality of die grooves are evenly arranged on the top of the lower die seat.

[0016] Preferably, a sticker is provided at the bottom end of the punching block.

[0017] Preferably, a discharge device is provided between the lower die seat and the base, and the discharge device comprises:

[0018] A rotating chamber, wherein the rotating chamber is provided at the top of the base, the lower die seat is located in the rotating chamber, a reduction motor is provided on the inner wall of the rotating chamber, and the reduction motor is electrically connected to a controller;

[0019] A rotating plate, the rotating plate being sleeved on the lower die base, and the rotating plate is connected to the reduction motor via a first rotating rod;

[0020] Support device: two support devices are symmetrically provided at the bottom end of the rotating plate, and two adjacent support devices are located on both sides of the lower mold base.

[0021] Preferably, the unloading device further comprises: an ejection plate, the ejection plate being arranged in the rotating cavity, the ejection plate being arranged parallel to the lower die base, a plurality of ejection rods being evenly arranged on the top of the ejection plate, the ejection rods extending into the die groove and connected to the cleaning plate, the cleaning plate being slidably connected to the die groove, a spring being sleeved on the ejection rod, and the spring being arranged between the lower die base and the ejection plate;

[0022] a first connecting rod, one end of which is connected to the side of the ejection plate away from the ejection rod, and the other end of which is rotatably provided with a first sliding wheel;

[0023] An arc-shaped slide rail is arranged at the bottom end of the inner wall of the rotating chamber. A sliding groove is provided on the arc-shaped slide rail, and the first pulley is slidably connected to the sliding groove.

[0024] Preferably, the supporting device comprises:

[0025] A second connecting rod, the top end of which is arranged at the bottom end of the rotating plate, the bottom end of which is provided with a pulley groove, and a second pulley is provided in the pulley groove for rotation via a rotating shaft;

[0026] A circular rail is fixed in the rotating cavity, and the second pulley is slidably connected to the circular rail.

[0027] Preferably, the unloading device further comprises: an inclined plate, and the inclined plate is arranged on one side of the base.

[0028] Preferably, the inclined plate is made of rubber material.

[0029] A magnetic core of a chip common-mode inductor, comprising:

[0030] A central column, wherein both ends of the central column are provided with magnetic plates, the top ends of the magnetic plates are provided with a plurality of connection terminals, and the top ends of the connection terminals are provided with electrode layers.

[0031] Compared with the prior art, the present invention has at least the following beneficial effects:

[0032] The magnetic core and preparation process of a chip common-mode inductor described in the present invention are as follows: powder is added to a mold of a stamping device, and then the mold is used to press the overall large-scale structure of the magnetic core. The pressed magnetic core is then processed by a multi-functional processing machine to be processed into a green semi-finished product according to the final product shape and structure. After high-temperature sintering, the semi-finished product is completed. Finally, the sintered magnetic core is silver-dipped and then baked to form an electrode layer to obtain a finished magnetic core.

[0033] The present invention describes a magnetic core of a chip common-mode inductor and a preparation process. Other advantages, objectives, and features of the present invention will be partially reflected in the following description and will also be understood by technicians in this field through research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0035] Figure 1 It is a structural schematic diagram of the finished magnetic core of the present invention;

[0036] Figure 2 is a schematic top view of a finished magnetic core of the present invention;

[0037] Figure 3 It is a side view of the finished magnetic core of the present invention;

[0038] Figure 4 It is a structural schematic diagram of the punching device of the present invention;

[0039] Figure 5 It is a structural schematic diagram of the lower die base of the present invention;

[0040] Figure 6 It is a structural schematic diagram of the unloading device of the present invention;

[0041] Figure 7 It is a structural schematic diagram of the rotary chamber of the present invention;

[0042] Figure 8 It is a structural schematic diagram of the detection device of the present invention;

[0043] Figure 9 It is a structural schematic diagram of the detector of the present invention;

[0044] Figure 10 For the present invention Figure 9 Enlarged schematic diagram of point A in the middle.

[0045] Explanation of the accompanying symbols: 1. magnetic plate; 2. center column; 3. electrode layer; 4. terminal; 5. stamping device; 6. base; 7. mounting seat; 8. column; 9. pressing plate; 10. sliding sleeve; 11. hydraulic rod; 12. upper die base; 13. lower die base; 14. rotating cavity; 15. inclined plate; 16. die groove; 17. stamping block; 18. reduction motor; 19. rotating plate; 20. first rotating rod; 21. pulley groove; 22. second connecting rod; 23. second pulley; 24. circular rail; 25. arc slide rail; 26. first connecting rod; 27. clear 28. Spring; 29. ​​Push-out plate; 30. Push-out rod; 31. First sliding wheel; 32. Sliding groove; 33. First moving groove; 34. Second rotating rod; 35. First moving block; 36. Rack; 37. Gear; 38. Cleaning wheel; 39. Measuring device; 40. Servo motor; 41. Third rotating rod; 42. Flattening block; 43. Inner ring; 44. Contact block; 45. Measuring seat; 46. Pressure sensor; 47. Pressure spring; 48. Third connecting rod; 49. Measuring groove; 50. Second moving groove; 51. Second moving block. DETAILED DESCRIPTION

[0046] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments so that those skilled in the art can implement the invention with reference to the description.

[0047] It should be understood that terms such as “having”, “including” and “comprising” used herein do not preclude the existence or addition of one or more other elements or combinations thereof.

[0048] like Figures 4-10 As shown, the present invention provides a process for preparing a magnetic core of a patch common-mode inductor, comprising:

[0049] Step 1: Add powder to the mold of the stamping device and use the mold to press out the overall large-scale structure of the magnetic core;

[0050] Step 2: The pressed magnetic core is processed by a multifunctional processing machine and processed into a green semi-finished product according to the final shape and structure of the product;

[0051] Step 3: After high-temperature sintering, the semi-finished product is completed;

[0052] Step 4: After the sintered magnetic core is subjected to silver dipping and silver baking treatments, nickel and tin are electroplated to form an electrode layer to obtain a finished magnetic core with completed electrode metallization.

[0053] The working principle and beneficial effects of the above technical solution are as follows: powder is added to the mold of the stamping device, and then the mold is used to press out the overall large-scale structure of the magnetic core. The pressed magnetic core is then processed by a multifunctional processing machine and processed into a green semi-finished product according to the final product shape and structure. After high-temperature sintering, the semi-finished product is completed. Finally, the sintered magnetic core is subjected to silver dipping and silver baking treatments, and then electroplated with nickel and tin to form an electrode layer to obtain a finished magnetic core with completed electrode metallization. During the production process of the magnetic core prepared by the above method, the multifunctional processing machine can process and adjust the size of each part as needed, thereby achieving product diversification. At the same time, by pressing the overall large-scale structure of the product, the consistency of pressure in each part can be ensured, especially the density distribution of the 8 electrode pad positions is improved, which can withstand greater pressure, ensure that this position is more dense and has no loose state, improve the reliability of subsequent inductance, improve the thrust test value, and reduce or eliminate the falling off of the finished inductor during the drop test on the PCB board.

[0054] In one embodiment, the punching device 5 includes:

[0055] A base 6, a mounting seat 7 is provided on the top of the base 6 in parallel, and the mounting seat 7 is connected to the base 6 via a plurality of columns 8;

[0056] Forming device: a forming device is provided on the base 6.

[0057] The forming device includes: a hydraulic rod 11, the hydraulic rod 11 is arranged on the mounting seat 7, a pressing plate 9 is provided at the bottom end of the hydraulic rod 11, and the hydraulic rod 11 is electrically connected to the controller;

[0058] A sliding sleeve 10 is sleeved on the column 8, and an outer wall of the sliding sleeve 10 is connected to the pressing plate 9;

[0059] An upper die base 12, the top of which is located at the bottom of the pressing plate 9, and a plurality of punching blocks 17 are evenly arranged at the bottom of the upper die base 12;

[0060] The lower die base 13 is disposed in the base 6 , and a plurality of die grooves 16 are evenly disposed on the top of the lower die base 13 .

[0061] The working principle and beneficial effects of the above technical solution: During actual use, after the powder is added into the die groove 16, the hydraulic rod 11 is started, and the hydraulic rod 11 extends to drive the pressing plate 9 to move downward. The pressing plate 9 presses the punching block 17 into the die groove 16 through the upper die seat 12, thereby pressing the powder layer into a rectangular magnetic core.

[0062] In one embodiment, a sticker is provided at the bottom end of the punching block 17 .

[0063] The working principle and beneficial effects of the above technical solution are as follows: after the punching block 17 completes the punching, the provided sticker prevents the punching block 17 from being adsorbed on the pressed magnetic core, making it easier for the punching block 17 to be withdrawn.

[0064] In one embodiment, a discharge device is provided between the lower die base 13 and the base 6, and the discharge device includes:

[0065] A rotating chamber 14 is provided at the top of the base 6, the lower die base 3 is located in the rotating chamber 14, a reduction motor 18 is provided on the inner wall of the rotating chamber 14, and the reduction motor 18 is electrically connected to the controller;

[0066] A rotating plate 19 is sleeved on the lower die base 13 and is connected to the reduction motor 18 via a first rotating rod 20;

[0067] Support device: two support devices are symmetrically provided at the bottom end of the rotating plate 19, and the two adjacent support devices are located on both sides of the lower mold base 13;

[0068] An ejection plate 29 is disposed in the rotating cavity 14 and is arranged parallel to the lower die base 13. A plurality of ejection rods 30 are evenly arranged on the top of the ejection plate 29. The ejection rods 30 extend into the die groove 16 and are connected to the cleaning plate 27. The cleaning plate 27 is slidably connected to the die groove 16. A spring 28 is sleeved on the ejection rod 30. The spring 28 is disposed between the lower die base 13 and the ejection plate 29.

[0069] A first connecting rod 26, one end of which is connected to the side of the ejection plate 29 away from the ejection rod 30, and the other end of the first connecting rod 26 is rotatably provided with a first sliding wheel 31;

[0070] The arc-shaped slide rail 25 is provided at the bottom end of the inner wall of the rotating chamber 14. The arc-shaped slide rail 25 is provided with a sliding groove 32. The first pulley 31 is slidably connected to the sliding groove 32.

[0071] The supporting device comprises:

[0072] A second connecting rod 22, the top of which is disposed at the bottom of the rotating plate 19, and a pulley groove 21 is provided at the bottom of the second connecting rod 22, in which a second pulley 23 is provided for rotation via a rotating shaft;

[0073] The circular rail 24 is fixed in the rotating cavity 14 , and the second pulley 23 is slidably connected to the circular rail 24 .

[0074] The inclined plate 15 is provided on one side of the base 6 .

[0075] The working principle and beneficial effects of the above technical solution: During actual use, before the stamping begins, the second connecting rod 22 remains in a vertical state, so that the second connecting rod 22 supports the lower die base 13 through the rotating plate 19. At this time, the cleaning plate 27 is located at the bottom end of the inner wall of the die groove 16. During stamping, the stamping block cooperates with the die groove 16 and the cleaning plate 27 to complete the stamping to form a rectangular magnetic core; after the stamping is completed, the reduction motor is started, and the reduction motor 18 drives the rotating plate 19 to rotate 90 degrees through the first rotating rod 20. During the rotation process, the rotating plate 19 drives the second pulley to slide on the circular rail 24 through the second connecting rod 22, and the rotating plate 19 drives the lower die base 13 to rotate. The lower die base 13 drives the ejection plate 29 to rotate through a number of ejection rods 30, and the ejection plate 29 drives the first sliding wheel through the first connecting rod 26 31 slides in the sliding groove 32. During the sliding process, under the action of the arc-shaped slide rail 25, the arc-shaped slide rail drives the push rod 30 to move in the compression direction of the spring 28 through the first sliding wheel 31, the first connecting rod 26 and the push plate 29, so that the cleaning plate 27 slides in the die groove 16, thereby pushing the pressed rectangular magnetic core out of the die groove 16. After the lower die base 13 rotates 90 degrees, the rectangular magnetic core is just pushed out of the die groove 16 and falls on the inclined plate 15 under the action of gravity, completing the unloading, avoiding manual unloading by hammering the back of the lower die base 13, causing the lower die base 13 to deform. At the same time, during the unloading process, the cleaning plate 27 can clean the inner wall of the die groove 16, avoiding the powder solidification on the inner wall of the die groove 16 after long-term use, affecting the stamping of the punching block 17, thereby improving the stamping quality.

[0076] In one embodiment, the inclined plate 15 is made of rubber material.

[0077] The working principle and beneficial effects of the above technical solution are as follows: the rubber inclined plate 15 can act as a buffer when the magnetic core falls on the inclined plate, thereby preventing the magnetic core from being damaged by impact.

[0078] In one embodiment, the base 6 is further provided with a detection device, which includes:

[0079] A first movable groove 33 is provided on the inner wall of the rotating chamber 14 and is located above the servo motor 18. A servo motor 40 is provided on the inner wall of the first movable groove 33 and is electrically connected to a controller.

[0080] a first moving block 35 slidably connected to the first moving groove 33 ;

[0081] A second rotating rod 34, one end of which is connected to the servo motor 40, and the other end of which is rotatably connected to the inner wall of the first movable groove 33, wherein the second rotating rod 34 passes through the first movable block 35, and the first movable block 35 is connected to the second rotating rod 34 by a thread.

[0082] A second movable groove 50 is provided on the inner wall of the rotating chamber 14 , and a second movable block 51 is slidably connected in the second movable groove 50 . The second movable block 51 and the first movable block 35 are on the same horizontal plane;

[0083] A third rotating rod 41, the ends of which are rotatably connected to the first moving block 35 and the second moving block 51 respectively. A cleaning wheel 38 is sleeved on the third rotating rod 41, and a plurality of flattening blocks 42 are evenly arranged on the cleaning wheel 38;

[0084] a rack 36 disposed in the first movable groove 33;

[0085] a gear 37 , the gear 37 being sleeved on the third rotating rod 41 and meshing with the rack 36 ;

[0086] Measuring device 39, two measuring devices 39 are sleeved on the third rotating rod 41, and two adjacent measuring devices 39 are located on both sides of the cleaning wheel 38, and the measuring devices 39 include:

[0087] The inner ring 43 is sleeved on the third rotating rod 41. A plurality of measuring units are evenly arranged on the outer wall of the inner ring 43. The measuring units include:

[0088] A measuring seat 45 is provided on the outer wall of the inner ring 43 . A measuring groove 49 is provided on the measuring seat 45 . A pressure sensor 46 is provided on the inner wall of the measuring groove 49 . The pressure sensor 46 is electrically connected to the controller.

[0089] A third connecting rod 48, one end of which is slidably connected to the measuring slot 49, and the other end of which is provided with a contact block 44, which is arc-shaped;

[0090] A pressure spring 47 , one end of which is connected to the third connecting rod 48 , and the other end of which is connected to the pressure sensor 46 .

[0091] The working principle and beneficial effects of the above technical solution: in actual use, after completing a stamping, the unloading device drives the lower die base 13 back to its original position to add powder, and then starts the servo motor 40. The servo motor 40 drives the first moving block 35 to slide in the first moving groove 33 through the second rotating rod 34, so that the first moving block 35 drives the third rotating rod 41 to move. During the movement, the rack 36 drives the third rotating rod 41 to rotate through the gear 37. During the movement of the third rotating rod 41, the third rotating rod 41 causes the contact block 44 to contact one side edge of the lower die base 13. At this time, the contact block 44 squeezes the pressure sensor 46 through the third connecting rod 48 and the pressure spring 47, so that the pressure sensor 46 detects a pressure value, which is recorded as the first pressure value. When the third rotating rod 41 drives the contact block 44 to leave the lower die base 13, the pressure value measured by the pressure sensor 46 is recorded as the second pressure value. The first pressure value is compared with the second pressure value. When the two pressure values ​​are equal, it means that the lower die base maintains water. When the first pressure value is not equal to the second pressure value, it means that the lower die base 13 is in a tilted state. Start the reduction motor 18 to rotate and adjust the lower die base until the lower die base 13 is level, so as to avoid the lower die base 13 tilting so that the punching block 17 cannot enter the die groove 16, thereby causing stamping failure and damaging the lower die base 13 and the punching block 17; and during the movement of the third rotating rod 41, the third rotating rod 41 will drive the cleaning wheel 38 to clean the surface of the lower die base 13 to avoid residual on the surface of the lower die base. The powder is mixed into the pressed rectangular magnetic core along with the unloading device, affecting the subsequent processing, while ensuring the neatness of the stamping process; and during the cleaning process of the cleaning wheel 38, the tip of the flattening block 42 will process the powder in the die groove 16. Under the action of the tip, the conical powder pile becomes higher at both ends, thereby facilitating the upper die base to press the powder pile, avoiding the powder in the die groove 16 from being in a pointed cone pile after the feeding is completed, resulting in the inability to well press the overall shape of the magnetic core terminal, thereby improving the production yield of the magnetic core.

[0092] like Figure 1-Figure 3 As shown, the present invention also provides a shoe common mode inductor core, comprising:

[0093] A central column 2 is provided with magnetic plates 1 at both ends of the central column 2 , a plurality of connection terminals 4 are provided at the top of the magnetic plates 1 , and an electrode layer 3 is provided at the top of the connection terminals 4 .

[0094] The working principle and beneficial effects of the above technical solution: In actual use, a variety of winding structure solutions can be realized by providing multiple electrode layers 3.

[0095] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships 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 should not be understood as limiting the present invention.

[0096] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0097] Although the embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the description and implementation methods. They can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A process for preparing a magnetic core of a patch common-mode inductor, characterized in that: include: Step 1: Add powder to the mold of the stamping device and use the mold to press out the overall large-scale structure of the magnetic core; Step 2: The pressed magnetic core is processed by a multifunctional processing machine and processed into a green semi-finished product according to the final shape and structure of the product; Step 3: After high-temperature sintering, the semi-finished product is completed; Step 4: After the sintered magnetic core is silver-dipped and silver-baked, nickel and tin are electroplated to form an electrode layer to obtain a finished magnetic core with completed electrode metallization; The punching device (5) comprises: a base (6), and a forming device is provided on the base (6); The molding device comprises: an upper mold base (12), a lower mold base (13); A discharge device is provided between the lower die seat (13) and the base (6), and the discharge device comprises: A rotating cavity (14), wherein the rotating cavity (14) is provided at the top of the base (6), the lower die seat (13) is located in the rotating cavity (14), a reduction motor (18) is provided on the inner wall of the rotating cavity (14), and the reduction motor (18) is electrically connected to a controller; A rotating plate (19), the rotating plate (19) is sleeved on the lower die base (13), and the rotating plate (19) is connected to the reduction motor (18) via a first rotating rod (20); Supporting device, two supporting devices are symmetrically provided at the bottom end of the rotating plate (19), and two adjacent supporting devices are located on both sides of the lower die base (13); The unloading device further includes: an ejection plate (29), the ejection plate (29) is arranged in the rotating cavity (14), the ejection plate (29) is arranged parallel to the lower die base (13), a plurality of ejection rods (30) are evenly arranged on the top of the ejection plate (29), the ejection rods (30) extend into the die groove (16) and are connected to the cleaning plate (27), the cleaning plate (27) is slidably connected to the die groove (16), a spring (28) is sleeved on the ejection rod (30), and the spring (28) is arranged between the lower die base (13) and the ejection plate (29); a first connecting rod (26), one end of the first connecting rod (26) being connected to a side of the ejection plate (29) away from the ejection rod (30), and the other end of the first connecting rod (26) being rotatably provided with a first sliding wheel (31); The arc-shaped slide rail (25) is provided at the bottom end of the inner wall of the rotating chamber (14), and a sliding groove (32) is provided on the arc-shaped slide rail (25). The first sliding wheel (31) is slidably connected in the sliding groove (32).

2. The process for preparing a magnetic core of a chip common mode inductor according to claim 1, characterized in that: A mounting seat (7) is provided parallel to the top of the base (6), and the mounting seat (7) is connected to the base (6) via a plurality of columns (8).

3. The process for preparing a magnetic core of a chip common mode inductor according to claim 2, characterized in that: The forming device comprises: a hydraulic rod (11), the hydraulic rod (11) is arranged on the mounting seat (7), a pressing plate (9) is provided at the bottom end of the hydraulic rod (11), and the hydraulic rod (11) is electrically connected to a controller; A sliding sleeve (10), wherein the sliding sleeve (10) is sleeved on the column (8), and an outer wall of the sliding sleeve (10) is connected to the pressing plate (9); The top end of the upper die seat (12) is arranged at the bottom end of the pressing plate (9), and a plurality of punching blocks (17) are evenly arranged at the bottom end of the upper die seat (12); The lower die seat (13) is arranged in the base (6), and a plurality of die grooves (16) are evenly arranged on the top of the lower die seat (13).

4. The process for preparing a magnetic core of a chip common mode inductor according to claim 3, characterized in that: The bottom end of the punching block (17) is provided with a sticker.

5. The process for preparing a magnetic core of a chip common mode inductor according to claim 1, wherein: The supporting device comprises: A second connecting rod (22), the top end of the second connecting rod (22) is arranged at the bottom end of the rotating plate (19), a pulley groove (21) is provided at the bottom end of the second connecting rod (22), and a second pulley (23) is provided in the pulley groove (21) for rotation via a rotating shaft; A circular rail (24) is fixedly arranged in the rotating cavity (14), and the second pulley (23) is slidably connected to the circular rail (24).

6. The process for preparing a magnetic core of a chip common mode inductor according to claim 1, wherein: The unloading device further comprises an inclined plate (15), wherein the inclined plate (15) is arranged on one side of the base (6).

7. The process for preparing a magnetic core of a chip common mode inductor according to claim 6, characterized in that: The inclined plate (15) is made of rubber material.

8. A magnetic core of a chip common-mode inductor, suitable for the preparation process of a magnetic core of a chip common-mode inductor according to any one of claims 1 to 7, characterized in that: include: A middle column (2), wherein both ends of the middle column (2) are provided with magnetic plates (1), the top ends of the magnetic plates (1) are provided with a plurality of connection terminals (4), and the top ends of the connection terminals (4) are provided with electrode layers (3).

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