Magnetic core integrated forming mold and integrated magnetic core production method

Abstract

The invention discloses a magnetic core integral forming mold and an integral magnetic core production method. When the magnetic core integral forming mold is in a mold opening state, magnetic powder is filled into the column part forming through hole, then the first forming plate and the first forming column move downwards to enable the first forming plate and the second forming plate to be closed, and then the second forming column moves upwards relative to the second forming plate to transfer and fill part of the magnetic powder into the swing part forming through hole. Then the first forming column moves downwards relative to the first forming plate, the second forming column moves upwards relative to the second forming plate to form a magnetic core in a press fit mode, and then the magnetic core integrated forming mold is reset, opened and moved out of the magnetic core; according to the mold for pressing the magnetic core, a pipe body structure is not used, so that the durability of the mold is improved, the rebound directions of the swing part forming surface and the column part forming surface are opposite during mold opening, and the joint of the swing part and the column part of the magnetic core is not prone to dark cracks.

Description

Technical Field

[0001] The present invention relates to the field of magnetic cores, and in particular to an integrated magnetic core molding die and an integrated magnetic core production method. Background Art

[0002] Magnetic cores are usually provided in electronic devices, and the magnetic cores play a role in conducting magnetism. Some existing magnetic cores include a swing part and a column part, wherein the swing part is relatively flat and has a large width, and the column part is connected to one side of the swing part, and the column part is relatively small in width, so that the magnetic core is approximately T-shaped. At present, when such magnetic cores are produced, a mold can be used to press the magnetic powder material to form a magnetic core. At present, the mold for producing magnetic cores includes a forming plate, an upper forming column, a lower tube body and a lower inner column. The forming plate is provided with forming through holes along the upper and lower sides, the lower inner column is slidably penetrated in the lower tube body, and the lower tube body is slidably penetrated in the forming through hole, the upper forming column can be inserted into or out of the forming through hole, and the upper forming column is located above the lower tube body. During production, the magnetic powder material is filled into the forming through hole, and then the upper forming column is pressed down and inserted into the forming through hole. The upper forming column, the lower tube body and the lower inner column are close to each other to press the magnetic powder material to form a magnetic core, and then the upper forming column is separated from the forming through hole, and the lower tube body and the lower inner column are moved up relative to the forming plate to eject the magnetic core. Since the wall thickness of the lower tube is relatively thin, the lower tube is easily worn or deformed and damaged during production, resulting in insufficient durability of the integral core molding mold, and hidden cracks are prone to occur at the junction of the swing part and the column part of the produced magnetic core. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a magnetic core integral molding die, which can have high durability and reduce the risk of hidden cracks at the junction of the swing part and the column part of the magnetic core.

[0004] The present invention also provides a method for producing an integrated magnetic core using the above-mentioned integrated magnetic core forming mold.

[0005] The magnetic core integral molding die according to the first aspect of the present invention includes a first molding plate, a first molding column, a second molding plate and a second molding column. The first molding plate is provided with a swing portion molding through hole along the up-down direction; the first molding column is slidably arranged in the swing portion molding through hole along the up-down direction, and the lower end of the first molding column has a swing portion molding surface; the second molding plate is located below the first molding plate, and the second molding plate is provided with a column molding through hole along the up-down direction; the second molding column is slidably arranged in the column molding through hole along the up-down direction, the second molding column is located below the first molding column, and the upper end of the first molding column has a column molding surface; wherein the magnetic core integral molding mold has an open mold state and a closed mold state, in the open mold state, the first molding plate is separated from the second molding plate; in the closed mold state, the first molding plate is abutted against the second molding plate, the lower end of the swing portion molding through hole is butted and connected with the upper end of the column molding through hole, the swing portion molding surface, the hole wall of the swing portion molding through hole and the upper surface of the second molding plate can enclose a swing portion molding cavity, the hole wall of the column molding through hole and the column molding surface can enclose a column molding cavity, and the lower end of the swing portion molding cavity is connected with the upper end of the column molding cavity.

[0006] The magnetic core integral molding mold according to the first aspect of the present invention has at least the following beneficial effects: when the magnetic core integral molding mold is in the mold opening state, the magnetic powder material is filled into the column molding through hole, and then the first molding plate and the first molding column move downward to make the first molding plate and the second molding plate close together, and then the second molding column moves upward relative to the second molding plate to transfer part of the magnetic powder material to fill into the swing portion molding through hole, and then the first molding column moves downward relative to the first molding plate, and the second molding column moves upward relative to the second molding plate to press together to form a magnetic core, and then the magnetic core integral molding mold resets to open the mold and removes the magnetic core; the above-mentioned mold pressing magnetic core does not use a tube structure, so that the durability of the mold is improved, and when the mold is opened, the rebound directions of the swing portion molding surface and the column portion molding surface are opposite, so that hidden cracks are not easy to occur at the intersection of the swing portion and the column portion of the magnetic core.

[0007] According to some embodiments of the present invention, the thickness of the swing portion forming cavity is A, satisfying A≥0.25 mm.

[0008] According to some embodiments of the present invention, the column-forming through hole is a circular hole, and the diameter of the column-forming through hole is B, satisfying B≥1.5 mm.

[0009] According to some embodiments of the present invention, the cross-sectional area of ​​the column-shaped through hole is C, and the cross-sectional area of ​​the swing-shaped through hole is D, satisfying 3C=D.

[0010] According to some embodiments of the present invention, the first molding plate is provided with at least two swing portion molding through holes, the second molding columns are provided with at least two and are correspondingly penetrated through the swing portion molding through holes, the second molding plate is provided with at least two column portion molding through holes, the second molding columns are provided with at least two and are correspondingly penetrated through the column portion molding through holes, and the swing portion molding through holes are opposite to the column portion molding through holes one by one in the up and down directions.

[0011] According to some embodiments of the present invention, all of the column forming through holes are evenly arranged in the left-right direction, and the second forming plate is provided with a discharge plate portion, which is located on one side of the column forming through holes along the front-back direction, and the discharge plate portion is inclined downward in a direction away from the column forming through holes.

[0012] According to some embodiments of the present invention, all of the column-shaped through holes form a through-hole row, and the left-right width of the discharge plate portion is greater than the left-right width of the through-hole row.

[0013] According to some embodiments of the present invention, a powder spreading box is further included. The powder spreading box is slidably disposed on the upper side of the second forming plate along the front-rear direction, and the powder spreading box is provided with a powder outlet.

[0014] According to some embodiments of the present invention, the first mold frame, the second mold frame and the third mold frame are arranged in sequence along the up-down direction, the first mold frame and the second mold frame are both slidably connected to the third mold frame along the up-down direction, the first molding column is arranged on the first mold frame, the first molding plate is slidably arranged on the first mold frame along the up-down direction, an elastic member is arranged between the first molding plate and the first mold frame, the second molding plate is arranged on the second mold frame, and the second molding column is arranged on the third mold frame.

[0015] According to the one-piece magnetic core production method of the second aspect of the present invention, the above-mentioned magnetic core one-piece molding mold is used, including the following steps: powder feeding: the magnetic core one-piece molding mold is in the mold opening state, and the magnetic powder material is filled into the column molding through hole; powder transfer: the first molding plate and the first molding column are synchronously moved down, so that the first molding plate and the second molding plate are abutted and enter the mold closing state, and then the first molding plate, the first molding column and the second molding plate are synchronously moved down, so that part of the magnetic powder material in the column molding through hole is transferred to the swing part molding through hole; pressing the magnetic core: the first molding column is moved down and the magnetic powder material in the swing part molding through hole is pressed to form the magnetic core swing part, and then the first molding plate, the first molding column and the second molding plate are synchronously moved down and the magnetic powder material in the column molding through hole is pressed to form the magnetic core column part; mold opening and discharging: the first molding plate, the first molding column and the second molding plate are reset and moved to separate the first molding plate from the second molding plate and leave the mold, and the second molding column is moved up relative to the second molding plate to eject the magnetic core, and then the second molding column is moved and reset.

[0016] The integrated magnetic core production method according to the second aspect of the present invention has at least the following beneficial effects: due to the use of the above-mentioned integrated magnetic core molding mold, hidden cracks are less likely to occur at the junction of the swing part and the column part of the magnetic core, thereby improving the yield rate of the produced magnetic core.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0019] Figure 1 It is a schematic cross-sectional view of the principle of the magnetic core integral molding die in the powder feeding step of an embodiment of the present invention;

[0020] Figure 2 It is a schematic cross-sectional view of the principle of the magnetic core integral molding die in the powder material transfer step according to an embodiment of the present invention;

[0021] Figure 3 It is a schematic cross-sectional view of the principle of the magnetic core integral molding die in the step of pressing the magnetic core according to an embodiment of the present invention;

[0022] Figure 4 It is a schematic cross-sectional view of the principle of the magnetic core integral molding mold in the mold opening and discharging step according to an embodiment of the present invention;

[0023] Figure 5It is a three-dimensional schematic diagram of a magnetic core integral molding mold according to an embodiment of the present invention;

[0024] Figure 6 It is a schematic diagram of the process of the integrated magnetic core production method according to an embodiment of the present invention.

[0025] Reference numerals:

[0026] A first forming plate 100, a swing portion forming through hole 110;

[0027] A first forming column 200, a swing forming surface 210;

[0028] The second forming plate 300, the column forming through hole 310, the discharge plate portion 320, and the positioning column 330;

[0029] A second forming column 400, a column forming surface 410;

[0030] Powder box 500;

[0031] A first mold frame 610, a second mold frame 620, a third mold frame 630, an elastic member 640, and a vibrator 650;

[0032] A magnetic core 700, a pendulum portion 710, and a column portion 720;

[0033] Magnetic powder material 800. DETAILED DESCRIPTION

[0034] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0035] In the description of the present invention, it should be understood that descriptions involving orientation, such as orientation or positional relationship indicated as up, down, etc., are based on the orientation or positional relationship shown in the 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 a limitation on the present invention.

[0036] In the description of the present invention, "a plurality" means more than two. If there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0037] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0038] Reference Figures 1 to 5 , is a magnetic core integrated molding mold of an embodiment of the present invention, comprising a first molding plate 100, a first molding column 200, a second molding plate 300, and a second molding column 400. The first molding plate 100 is provided with a swing portion molding through hole 110 along the up-down direction; the first molding column 200 is slidably penetrated through the swing portion molding through hole 110 along the up-down direction, and the lower end of the first molding column 200 has a swing portion molding surface 210; the second molding plate 300 is located below the first molding plate 100, and the second molding plate 300 is provided with a column molding through hole 310 along the up-down direction; the second molding column 400 is slidably penetrated through the column molding through hole 310 along the up-down direction, and the second molding column 400 is located below the first molding column 200, and the upper end of the first molding column 200 has a column molding surface 410; wherein the magnetic core is integrated The mold has an open state and a closed state. In the open state, the first molding plate 100 is separated from the second molding plate 300; in the closed state, the first molding plate 100 is abutted against the second molding plate 300, the lower end of the swing portion molding through hole 110 is connected to and communicated with the upper end of the column portion molding through hole 310, the swing portion molding surface 210, the hole wall of the swing portion molding through hole 110 and the upper surface of the second molding plate 300 can form a swing portion molding cavity, the hole wall of the column portion molding through hole 310 and the column portion molding surface 410 can form a column portion molding cavity, and the lower end of the swing portion molding cavity is connected with the upper end of the column portion molding cavity.

[0039] When the integral molding mold for the magnetic core is in the mold opening state, the magnetic powder material is filled into the column molding through hole 310, and then the first molding plate 100 and the first molding column 200 are moved downward, so that the first molding plate 100 and the second molding plate 300 are molded together, and then the second molding column 400 is moved upward relative to the second molding plate 300 to transfer part of the magnetic powder material to fill into the swing molding through hole 110, and then the first molding column 200 is moved downward relative to the first molding plate 100, and the second molding column 400 is moved upward relative to the second molding plate 300 to press together to form a magnetic core, and then the integral molding mold for the magnetic core is reset to open the mold and remove the magnetic core; the above-mentioned mold pressing magnetic core does not use a tube structure, so that the durability of the mold is improved, and when the mold is opened, the rebound directions of the swing molding surface 210 and the column molding surface 410 are opposite, so that hidden cracks are not easy to occur at the intersection of the swing part and the column part of the magnetic core.

[0040] Specifically, a slender mold structure is prone to a little elastic deformation when subjected to force, while the plate body is difficult to undergo elastic deformation. When the mold is closed, the first molding column 200 and the second molding column 400 are subjected to force and will have a little elastic deformation. At the initial stage of the reset mold opening movement, the first molding column 200 has a tendency to rebound downward through the swing molding surface 210, and the second molding column 400 has a tendency to rebound upward through the column molding surface 410. Since the swing molding surface 210 and the column molding surface 410 have opposite rebound directions, the forces of the two on the magnetic core offset each other, and at this time, dark cracks are not likely to occur at the intersection of the swing part and the column.

[0041] Specifically, in the previous molds, at the initial stage of the reset and mold opening movement, both the lower tube body and the lower inner column rebound upward. At this time, the upper end of the lower tube body and the upper end of the lower inner column have different rebound amplitudes, but the same rebound direction, which can easily cause different degrees of rebound pushing on the swing part and the column part of the magnetic core, which may cause hidden cracks at the junction of the swing part and the column part of the magnetic core.

[0042] Specifically, the swing portion molding surface 210 is usually higher than the lower end of the swing portion molding through hole 110 to allow the magnetic powder material to enter the swing portion molding through hole 110; the column portion molding surface 410 is usually lower than the upper end of the column portion molding through hole 310 to allow the magnetic powder material to enter the column portion molding through hole 310. When the magnetic core needs to be ejected, the column portion molding surface 410 can be higher than the upper end of the column portion molding through hole 310.

[0043] In an embodiment, the thickness of the swing part molding cavity is A, satisfying A≥0.25mm. Specifically, the thickness of the swing part molding cavity is the upper and lower dimensions between the swing part molding surface 210 and the upper surface of the second molding plate 300. If the thickness of the swing part molding cavity is too small, that is, the thickness of the swing part of the finally molded magnetic core is too thin, the swing part of the magnetic core is prone to breakage during the pressing and demolding of the magnetic core, that is, the processing and production of the magnetic core is relatively difficult. Therefore, limiting the thickness of the swing part molding cavity to not less than 0.25mm can prevent the swing part of the magnetic core from breaking easily during the pressing and demolding of the magnetic core, thereby improving the production yield of the magnetic core.

[0044] Specifically, the thickness of the swing part molding cavity may be 0.3 mm, 0.4 mm, 0.5 mm, 1 mm, 2 mm or other values, and those skilled in the art may configure the thickness according to actual needs.

[0045] In the embodiment, the column forming through hole 310 is a circular hole, and the diameter of the column forming through hole is B, satisfying B≥1.5mm. If the column diameter of the magnetic core is too small, it is easy to break during the pressing and demolding process, and the second forming column 400 is also easy to be damaged. Therefore, when the diameter of the column forming through hole 310 is not less than 1.5mm, it is beneficial to improve the production yield of the magnetic core, reduce the risk of the column of the magnetic core breaking, and also help to reduce the risk of damage to the second forming column 400, and further improve the durability of the magnetic core integral molding mold.

[0046] In the embodiment, the cross-sectional area of ​​the column forming through hole 310 is C, and the cross-sectional area of ​​the swing forming through hole 110 is D, satisfying 3C = D. The column forming through hole 310 and the swing forming through hole 110 described above are conducive to the transfer of magnetic powder in the column forming through hole 310 into the swing forming through hole 110 and filling the swing forming cavity, thereby producing a magnetic core with a reasonable structure and good durability.

[0047] Specifically, in some embodiments, the cross-sections of the column and the pendulum of the magnetic core may be non-circular, that is, the cross-section of the column may be polygonal or elliptical, or other shapes, and the cross-section of the pendulum may be polygonal or elliptical, or other shapes; technical personnel in this field can make specific configurations according to actual needs.

[0048] In the embodiment, the first molding plate 100 is provided with four swing molding through holes 110, the second molding column 400 is provided with four and one-to-one correspondingly penetrates the swing molding through holes 110, the second molding plate 300 is provided with four column molding through holes 310, the second molding column 400 is provided with four and one-to-one correspondingly penetrates the column molding through holes 310, and the swing molding through holes 110 and the column molding through holes 310 are opposite to each other in the up and down direction. By providing four swing molding through holes 110, four first molding columns 200, four column molding through holes 310 and four second molding columns 400, four magnetic cores can be produced by opening and closing the mold at one time, so that the production efficiency of the magnetic core is higher. It can be understood that it is also possible to provide two, three or more swing molding through holes 110, and the corresponding first molding columns 200, column molding through holes 310 and second molding columns 400 are also provided with two, three or more numbers, which is not limited here.

[0049] In the embodiment, all column forming through holes 310 are evenly arranged in the left-right direction, and the second forming plate 300 is provided with a discharge plate portion 320, which is located on one side of the column forming through hole 310 in the front-back direction, and the discharge plate portion 320 is tilted downward in a direction away from the column forming through hole 310. The above layout method facilitates the transfer of all magnetic cores to the discharge plate portion 320 at one time, avoids mutual interference between different magnetic cores when the magnetic cores are transferred, and the distance for each magnetic core to be transferred to the discharge plate portion 320 is relatively short.

[0050] In the embodiment, all column forming through holes 310 form a through hole row, and the left and right width of the discharge plate portion 320 is greater than the left and right width of the through hole row. When the pusher mechanism pushes the magnetic core toward the discharge plate portion 320, the magnetic core can directly reach the discharge plate portion 320, avoiding magnetic core residue and reducing the risk of the magnetic core not entering the discharge plate portion 320.

[0051] In the embodiment, a powder box 500 is further included, and the powder box 500 is slidably disposed on the upper side of the second molding plate 300 along the front-back direction, and the powder box 500 is provided with a powder outlet. When the powder box 500 is provided and magnetic powder needs to be loaded, the powder box 500 can be moved to align the powder outlet with the column molding through hole 310, and then the magnetic powder inside the powder box 500 is filled into the column molding through hole 310.

[0052] Specifically, a slide groove is formed on the upper side of the second forming plate 300, and the powder spreading box 500 is slidably connected to the slide groove. It is conceivable that in other embodiments, the powder spreading box 500 can also be slidably connected to the second forming plate 300 through a guide column and guide sleeve structure.

[0053] In the embodiment, the first mold frame 610, the second mold frame 620 and the third mold frame 630 are arranged in sequence in the up-down direction. The first mold frame 610 and the second mold frame 620 are both slidably connected to the third mold frame 630 in the up-down direction. The first molding column 200 is arranged on the first mold frame 610. The first molding plate 100 is slidably arranged on the first mold frame 610 in the up-down direction. An elastic member 640 is arranged between the first molding plate 100 and the first mold frame 610. The second molding plate 300 is arranged on the second mold frame 620, and the second molding column 400 is arranged on the third mold frame 630. The above-mentioned magnetic core integral molding mold can adopt a three-layer mold frame to complete the entire production process, with a simple structure and easy implementation.

[0054] Specifically, the second mold frame 620 is connected to a vibrator 650. The vibrator 650 can make the magnetic powder material fully fill the column forming through hole 310, so that the quality of the pressed magnetic core product is better.

[0055] Specifically, the powder box 500 is also connected to a vibrator 650 to facilitate the flow of magnetic powder to fill the column forming through hole 310 .

[0056] Specifically, a positioning column 330 is provided on the upper side of the second molding plate 300, and a positioning hole is provided on the lower side of the first molding plate 100, and the positioning column 330 is adapted to the positioning hole. The positioning column 330 and the positioning hole are provided to facilitate the first molding plate 100 to maintain alignment with the second molding plate 300 when in contact.

[0057] Specifically, the positioning column 330 is opposite to the column forming through hole 310 along the left and right direction. The positioning column 330 is located on the bottom wall of the slide groove, so that the positioning column 330 also has the function of limiting the powder box 500. When the powder box 500 contacts the positioning column 330, the powder outlet is aligned with the column forming through hole 310.

[0058] Specifically, it also includes a pusher mechanism, which is used to drive the magnetic core to move toward the discharge plate portion 320. After the magnetic core is pushed out of the column forming through hole 310 by the second forming column 400, the pusher mechanism can move the magnetic core to the discharge plate portion 320 in one step, and the discharge plate portion 320 guides the magnetic core to a designated position for collection, which is convenient for continuous production. Specifically, the pusher mechanism can use a pneumatic method to push the magnetic core. For example, the pusher mechanism includes a pusher seat and an air pump. The pusher seat is arranged with a plurality of blowing holes in a horizontal direction. The air pump blows air out through the blowing holes, thereby directly blowing the magnetic core remaining on the second forming plate 300 to the discharge plate portion 320, and then transferring it to the designated position through the discharge plate portion 320. The structure is simple and easy to implement. It is conceivable that the pushing mechanism can also use physical methods to push the magnetic core. For example, the pushing mechanism includes a push plate and a cylinder. The piston rod of the cylinder is connected to the push plate, driving the push plate to move along the upper surface of the second forming plate 300, thereby pushing the magnetic core into the discharge plate portion 320, so that the magnetic core moves through the discharge plate portion 320 to a designated position for collection.

[0059] Reference Figure 6 This embodiment also discloses a method for producing an integrated magnetic core, which uses the above-mentioned integrated magnetic core molding mold and includes the following steps:

[0060] S10: feeding powder material: the magnetic core integral molding mold is in the mold opening state, and the magnetic powder material is filled into the column molding through hole 310;

[0061] S20: powder material transfer: the first molding plate 100 and the first molding column 200 move downward synchronously, so that the first molding plate 100 abuts against the second molding plate 300 and enters a mold closing state, and then the first molding plate 100, the first molding column 200 and the second molding plate 300 move downward synchronously, so that part of the magnetic powder material in the column forming through hole 310 is transferred to the swing forming through hole 110;

[0062] S30: Pressing the magnetic core: The first forming column 200 moves downward and presses the magnetic powder material in the swing forming through hole 110 to form the swing part of the magnetic core, and then the first forming plate 100, the first forming column 200 and the second forming plate 300 move downward synchronously and press the magnetic powder material in the column forming through hole 310 to form the column part of the magnetic core;

[0063] S40: Mold opening and material discharge: The first molding plate 100, the first molding column 200 and the second molding plate 300 are reset and moved to separate the first molding plate 100 from the second molding plate 300 and leave the mold, the second molding column 400 moves upward relative to the second molding plate 300 to eject the magnetic core, and then the second molding column 400 moves and resets.

[0064] The above-mentioned integrated magnetic core production method adopts the above-mentioned integrated magnetic core forming mold, so that hidden cracks are not likely to occur at the intersection of the swing part and the column part of the magnetic core, thereby improving the yield rate of the produced magnetic core.

[0065] Specifically, in the step of pressing the magnetic core, the swing portion of the magnetic core and the magnetic core column are pressed and formed in sections, which can reduce the risk of uneven density of the entire magnetic core.

[0066] Specifically, in the swing part pressing step, the pressing speed of the first molding plate 100, the first molding column 200, and the second molding plate 300 is E, which satisfies 10mm / s≤E≤20mm / s. During the mold closing process, the first molding plate 100, the first molding column 200, the second molding plate 300, and the second molding column 400 need to press the magnetic powder material to form a magnetic core. If the pressing speed is too fast, it may cause the magnetic core to be not compacted enough; if the pressing speed is too slow, it will affect the production efficiency. Therefore, the pressing speed is 10mm / s≤E≤20mm / s. At this time, the compaction effect of the magnetic core is better, and it can have a relatively high production efficiency.

[0067] Specifically, the pressing speed E can be any value within the above range, such as 15 mm / s, etc. Those skilled in the art can make a specific selection according to actual needs.

[0068] In an embodiment, the step of pressing the swing part further includes: after pressing, the swing part forming cavity and the column forming cavity are pressurized, and the pressurization time is F, which satisfies 1s≤F≤5s. After pressing, the swing part forming cavity and the column forming cavity are pressurized, which is conducive to the relatively dense pressing between the magnetic powder materials and reduces the risk of magnetic core fragmentation.

[0069] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0070] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A magnetic core integral molding mold, characterized in that: include: The first forming plate (100) is provided with a swing portion forming through hole (110) in the up-down direction; A first forming column (200) is slidably disposed in the swing portion forming through hole (110) in the up-down direction, and the lower end of the first forming column (200) has a swing portion forming surface (210); A second molding plate (300) is located below the first molding plate (100), and the second molding plate (300) is provided with column molding through holes (310) along the up-down direction; A second molding column (400) is slidably disposed in the column molding through hole (310) in the up-down direction, the second molding column (400) is located below the first molding column (200), and the upper end of the first molding column (200) has a column molding surface (410); The magnetic core integral molding mold has an open mold state and a closed mold state. In the open mold state, the first molding plate (100) is separated from the second molding plate (300); in the closed mold state, the first molding plate (100) is abutted against the second molding plate (300), the lower end of the swing portion molding through hole (110) is butted against and connected to the upper end of the column portion molding through hole (310), the swing portion molding surface (210), the hole wall of the swing portion molding through hole (110) and the upper surface of the second molding plate (300) can form a swing portion molding cavity, the hole wall of the column portion molding through hole (310) and the column portion molding surface (410) can form a column portion molding cavity, and the lower end of the swing portion molding cavity is connected to the upper end of the column portion molding cavity.

2. The magnetic core integral molding die according to claim 1, characterized in that: The thickness of the swing part forming cavity is A, satisfying A≥0.25 mm.

3. The magnetic core integral molding die according to claim 1, characterized in that: The column forming through hole (310) is a circular hole, and the diameter of the column forming through hole is B, satisfying B≥1.5 mm.

4. The magnetic core integral molding die according to claim 1, characterized in that: The cross-sectional area of ​​the column-shaped through hole (310) is C, and the cross-sectional area of ​​the swing-shaped through hole (110) is D, satisfying 3C=D.

5. The magnetic core integral molding die according to claim 1, characterized in that: The first forming plate (100) is provided with at least two swing forming through holes (110), the second forming column (400) is provided with at least two and one-to-one correspondingly penetrated through the swing forming through holes (110), the second forming plate (300) is provided with at least two column forming through holes (310), the second forming column (400) is provided with at least two and one-to-one correspondingly penetrated through the column forming through holes (310), and the swing forming through holes (110) and the column forming through holes (310) are opposite to each other in the up-down direction.

6. The magnetic core integral molding die according to claim 5, characterized in that: All of the column forming through holes (310) are evenly arranged in the left-right direction, and the second forming plate (300) is provided with a discharge plate portion (320), and the discharge plate portion (320) is located on one side of the column forming through hole (310) in the front-back direction, and the discharge plate portion (320) is inclined downward in a direction away from the column forming through hole (310).

7. The magnetic core integral molding die according to claim 6, characterized in that: All of the column-shaped through holes (310) form a through hole row, and the left-right width of the discharge plate portion (320) is greater than the left-right width of the through hole row.

8. The magnetic core integral molding die according to claim 6, characterized in that: It also includes a powder spreading box (500), which is slidably arranged on the upper side of the second forming plate (300) along the front-rear direction, and the powder spreading box (500) is provided with a powder outlet.

9. The magnetic core integral molding die according to claim 1, characterized in that: The invention also comprises a first mold frame (610), a second mold frame (620) and a third mold frame (630) which are arranged in sequence along the up-down direction; the first mold frame (610) and the second mold frame (620) are both slidably connected to the third mold frame (630) along the up-down direction; the first molding column (200) is arranged on the first mold frame (610); the first molding plate (100) is slidably arranged on the first mold frame (610) along the up-down direction; an elastic member (640) is arranged between the first molding plate (100) and the first mold frame (610); the second molding plate (300) is arranged on the second mold frame (620); and the second molding column (400) is arranged on the third mold frame (630).

10. A method for producing an integrated magnetic core, using the integrated magnetic core forming mold according to any one of claims 1 to 9, characterized in that: The following steps are involved: Feeding powder material: the magnetic core integral molding mold is in an open mold state, and the magnetic powder material is filled into the column molding through hole (310); Powder material transfer: the first molding plate (100) and the first molding column (200) are synchronously moved downward, so that the first molding plate (100) and the second molding plate (300) are abutted and enter a mold closing state, and then the first molding plate (100), the first molding column (200) and the second molding plate (300) are synchronously moved downward, so that part of the magnetic powder material in the column part molding through hole (310) is transferred to the swing part molding through hole (110); Pressing the magnetic core: the first forming column (200) moves downward and presses the magnetic powder material in the swing portion forming through hole (110) to form a swing portion of the magnetic core, and then the first forming plate (100), the first forming column (200) and the second forming plate (300) move downward synchronously and press the magnetic powder material in the column portion forming through hole (310) to form a column portion of the magnetic core; Mold opening and unloading: the first molding plate (100), the first molding column (200) and the second molding plate (300) are reset and moved to separate the first molding plate (100) from the second molding plate (300) and to leave the mold; the second molding column (400) is moved upward relative to the second molding plate (300) to eject the magnetic core; and then the second molding column (400) is moved and reset.

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