Split type ferrite magnetic core, mold and manufacturing method

Abstract

The invention discloses a split type ferrite magnetic core, a mold and a manufacturing method, the magnetic core comprises a first magnetic core block, a second magnetic core block and a magnetic rod, the magnetic rod is fixedly connected with the first magnetic core block, the magnetic rod is provided with a fixing hole extending along the axial direction, the second magnetic core block is provided with a fixing rod, the fixing rod is arranged in the fixing hole, and two ends of the second magnetic core block are provided with clamping grooves. The two ends of the first magnetic core block are arranged in the clamping grooves; the die comprises a fixing plate, a bottom die, a guide block and a pressing die, the bottom die is arranged on the fixing plate, a forming groove is formed in the bottom die, the guide block is arranged between the bottom die and the pressing die and fixedly connected with the bottom die, a guide hole is formed in the guide block, the bottom of the guide hole is communicated with the forming groove, and the guide hole is provided with an inclined hole wall. The manufacturing method comprises five steps of S1 to S5. The connection effect and the connection strength of the first magnetic core block and the second magnetic core block can be improved, the internal density of the formed magnetic core is consistent, and the quality of the magnetic core is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of ferrite cores, and particularly relates to a split ferrite core, a mold and a manufacturing method thereof. Background Art

[0002] A ferrite core is a high-frequency magnetic conductive material, mainly used for high-frequency transformers, high-frequency magnetic rings, etc. The ferrite core is mainly composed of three metal elements: iron (Fe), manganese (Mn), and zinc (Zn), and is usually called manganese-zinc ferrite. The toroidal ferrite core has no air gap and a uniform cross-sectional area, so the magnetic effect is very high. The ferrite core is made of a dense and homogeneous ceramic-structured non-metallic magnetic material, with low coercivity, and is also called soft ferrite. The ferrite raw material is pressed, then sintered at a high temperature of 1300 °C, and finally processed by a machine to make a finished core that meets the application requirements. Compared with other types of magnetic materials, the advantages of ferrite are high magnetic permeability, high resistance and low eddy current loss in a wide frequency range.

[0003] The docking effect between the existing split ferrite cores is poor, resulting in poor connection between the two, affecting the magnetic performance, and due to the non-uniform internal density during the production process of the core, the quality of the core is low. Summary of the Invention

[0004] The purpose of the present invention is to solve the above-mentioned technical problems in the prior art, and provide a split ferrite core, a mold and a manufacturing method thereof, which can improve the docking effect and connection strength between ferrite cores, improve the compactness inside the core, and improve the core quality.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] A split ferrite core, characterized in that: it includes a first core block, a second core block and a magnetic rod. The magnetic rod is fixedly connected to the first core block. The magnetic rod is provided with a fixing hole extending along the axial direction. The second core block is provided with a fixing rod, and the fixing rod is arranged in the fixing hole. The two ends of the second core block are provided with clamping grooves, and the two ends of the first core block are arranged in the clamping grooves.

[0007] Furthermore, the first core block is provided with a through hole, and the through hole is communicated with the fixing hole.

[0008] The present invention also discloses a split ferrite core mold, characterized in that: it includes a fixing plate, a bottom mold, a guiding block and a pressing mold. The bottom mold is arranged on the fixing plate. The bottom mold is provided with a forming groove. The guiding block is arranged between the bottom mold and the pressing mold and is fixedly connected to the bottom mold. The guiding block is provided with a guiding hole, the bottom of the guiding hole is communicated with the forming groove, and the guiding hole is provided with an inclined hole wall.

[0009] Further, a pressing rod and a docking block are provided at the top of the pressing die. A slider is provided at the end of the pressing rod. The fixing plate is provided with a slide rail, and the slider is arranged in the slide rail and is slidably connected to the slide rail.

[0010] Further, a receiving hole is formed at the bottom of the bottom die. The receiving hole communicates with the forming groove. A compression assembly is arranged in the receiving hole. The compression assembly includes a movable block, a spring and a fixed block. The movable block, the spring and the fixed block are sequentially arranged in the receiving hole from top to bottom. The movable block is movably connected to the receiving hole, and the fixed block is fixed in the receiving hole.

[0011] Further, a locking assembly is arranged between the guiding block and the pressing die. The locking assembly includes a fixing member, a movable member and a clamping member. The movable member is arranged on the fixing member and is movably connected to the fixing member. The clamping member includes a clamping screw and a clamping nut. The clamping screw passes through the fixing member and the movable member, and the clamping nut is threadedly connected to the clamping screw and clamps the fixing member and the movable member.

[0012] Further, the fixing member is provided with a guiding post, and the movable member is provided with a sleeve. The sleeve is arranged on the guiding post and is slidably connected to the guiding post.

[0013] Further, the fixing member is provided with a clamping rod. The clamping rod is clamped on the guiding block and the pressing die. The clamping rod is provided with a positioning protrusion portion. Both the guiding block and the pressing die are provided with positioning grooves, and the positioning protrusion portion is arranged on the positioning groove.

[0014] The present invention also discloses a manufacturing method of a split ferrite magnetic core, which is characterized by including the following steps:

[0015] S1. Slide all the pressing dies upward to open them, and then horizontally insert and fix a movable rod in the die corresponding to the first magnetic core block;

[0016] S2. After mixing, pre-burning and ball-milling the raw material ratio, weigh the raw material powder and place it into the bottom die and level it;

[0017] S3. Connect the pressing die to the cylinder, and then start the cylinder to press the pressing die against the guiding block;

[0018] S4. Clamp the locking assembly on the guiding block and the pressing die, then tighten the clamping nut to fix it, and then send the die into the furnace for sintering and forming;

[0019] S5. Demold the sintered and formed ferrite magnetic core, and then grind and polish the ferrite magnetic core.

[0020] Further, in step S2, the mass of the raw material powder placed into the bottom die should be 1.02 - 1.05 times the mass of the raw material powder designed to be accommodated in the volume of the bottom die.

[0021] Due to the adoption of the above technical solution, the present invention has the following beneficial effects:

[0022] In the present invention, by providing a fixing hole inside the magnetic rod and disposing a fixing rod in the fixing hole, the contact area between the first magnetic core block and the second magnetic core block is increased, playing a positioning role and improving the connection effect and connection strength between the first magnetic core block and the second magnetic core block.

[0023] Due to the provision of the guiding block and the guiding hole in the mold of the present invention, it can ensure that all the raw material powder can fall into the forming groove, avoiding the raw material powder remaining on the top surface of the bottom mold, which makes it difficult to compact the raw material powder, making the manufacture of the magnetic core more convenient. And due to the provision of the compression assembly in the mold, it can make the magnetic powder in the bottom mold be uniformly pressed, and the internal density of the formed magnetic core is consistent, improving the quality of the magnetic core. Brief Description of the Drawings

[0024] The present invention will be further described below in conjunction with the drawings:

[0025] Figure 1 It is a schematic structural diagram of a split ferrite magnetic core of the present invention;

[0026] Figure 2 It is a schematic structural diagram of a mold for a split ferrite magnetic core of the present invention;

[0027] Figure 3 It is a schematic structural diagram of the mold for the first magnetic core block of the present invention when it is opened;

[0028] Figure 4 It is a schematic structural diagram of the mold for the second magnetic core block of the present invention when it is opened;

[0029] Figure 5 It is a schematic structural diagram of the bottom mold of the first magnetic core block of the present invention;

[0030] Figure 6 It is a schematic structural diagram of the bottom mold of the second magnetic core block of the present invention;

[0031] Figure 7 It is a schematic structural diagram of the compression assembly of the present invention;

[0032] Figure 8 It is a schematic structural diagram of the locking assembly of the present invention;

[0033] Figure 9 It is an exploded view of the locking assembly of the present invention.

[0034] In the figure, 1 - first magnetic core block; 2 - second magnetic core block; 3 - magnetic rod; 4 - fixing hole; 5 - fixing rod; 6 - clamping groove; 7 - through hole; 8 - fixing plate; 9 - bottom mold; 10 - guiding block; 11 - pressing mold; 12 - forming groove; 13 - guiding hole; 14 - hole wall; 15 - pressing rod; 16 - docking block; 17 - sliding block; 18 - sliding rail; 19 - accommodating hole; 20 - compression assembly; 21 - movable block; 22 - spring; 23 - fixing block; 24 - locking assembly; 25 - fixing piece; 26 - movable piece; 27 - clamping piece; 28 - clamping screw; 29 - clamping nut; 30 - guiding column; 31 - sleeve; 32 - clamping rod; 33 - positioning convex part; 34 - positioning groove; 35 - movable rod. Detailed implementation mode

[0035] As Figure 1 shown, a split ferrite magnetic core of the present invention includes a first magnetic core block 1, a second magnetic core block 2 and a magnetic rod 3. The magnetic rod 3 is fixedly connected to the first magnetic core block 1. The magnetic rod 3 is provided with a fixing hole 4 extending axially. The second magnetic core block 2 is provided with a fixing rod 5, and the fixing rod 5 is arranged in the fixing hole 4. Both ends of the second magnetic core block 2 are provided with clamping grooves 6, and both ends of the first magnetic core block 1 are arranged in the clamping grooves 6. Through the above settings, the first magnetic core block 1 and the second magnetic core block 2 can be in full contact, improving the connection effect between the first magnetic core block 1 and the second magnetic core block 2, making the connection between the two more tight. At the same time, the setting of the clamping groove 6 can facilitate the positioning connection between the first magnetic core block 1 and the second magnetic core block 2, improving the connection effect.

[0036] As an implementation method, the first magnetic core block 1 is provided with a through hole 7, and the through hole 7 is communicated with the fixing hole 4. Through the above settings, on the one hand, the fixing hole 4 is made to penetrate, facilitating the insertion of the fixing rod 5. On the other hand, it can facilitate the formation of the fixing hole 4 during mold forming and facilitate demolding.

[0037] As Figures 2 to 9 shown, the present invention also discloses a split ferrite magnetic core mold, including a fixing plate 8, a bottom mold 9, a guiding block 10 and a pressing mold 11. The bottom mold 9 is arranged on the fixing plate 8. The bottom mold 9 is provided with a forming groove 12. The guiding block 10 is arranged between the bottom mold 9 and the pressing mold 11 and is fixedly connected to the bottom mold 9. The guiding block 10 is provided with a guiding hole 13, and the bottom of the guiding hole 13 is communicated with the forming groove 12. The guiding hole 13 is provided with an inclined hole wall 14. Through the above settings, all the raw material powder can fall into the forming groove 12, avoiding the raw material powder remaining on the top surface of the bottom mold 9, which makes it difficult to compact the raw material powder and makes the manufacture of the magnetic core more convenient.

[0038] As an implementation manner, a pressure rod 15 and a docking block 16 are provided at the top of the die 11. A slider 17 is provided at the end of the pressure rod 15. The fixed plate 8 is provided with a slide rail 18. The slider 17 is arranged in the slide rail 18 and is slidably connected to the slide rail 18. Through the above settings, it is convenient to connect the die 11 with the air cylinder and to close the die 11 with the bottom die 9. The settings of the slide rail 18 and the slider 17 can play a guiding role and improve the docking effect between the die 11 and the bottom die 9.

[0039] As an implementation manner, a receiving hole 19 is formed at the bottom of the bottom die 9. The receiving hole 19 communicates with the forming groove 12. A compression assembly 20 is arranged in the receiving hole 19. The compression assembly 20 includes a movable block 21, a spring 22 and a fixed block 23. The movable block 21, the spring 22 and the fixed block 23 are arranged in the receiving hole 19 from top to bottom in sequence. The movable block 21 is movably connected to the receiving hole 19, and the fixed block 23 is fixed in the receiving hole 19. Through this, the magnetic powder in the bottom die 9 can be uniformly pressed, the internal density of the formed magnetic core is consistent, and the quality of the magnetic core is improved. The spring 22 can provide a certain pressure. Only when the internal pressure of the raw material powder is greater than the pressure of the spring 22 can the fixed block 23 be pushed, so as to ensure the tightness of the raw material powder and make the density of the sintered magnetic core consistent.

[0040] As an implementation manner, a locking assembly 24 is arranged between the guiding block 10 and the die 11. The locking assembly 24 includes a fixing member 25, a movable member 26 and a clamping member 27. The movable member 26 is arranged on the fixing member 25 and is movably connected to the fixing member 25. The clamping member 27 includes a clamping screw 28 and a clamping nut 29. The clamping screw 28 passes through the fixing member 25 and the movable member 26, and the clamping nut 29 is threadedly connected to the clamping screw 28 and clamps the fixing member 25 and the movable member 26. Through the above settings, it is convenient to lock and fix the bottom die 9 and the die 11, and it is convenient for firing the magnetic core. The locking assembly 24 is convenient to clamp and has a good clamping effect.

[0041] Specifically, the fixing member 25 is provided with a guiding post 30, and the movable member 26 is provided with a sleeve 31. The sleeve 31 is arranged on the guiding post 30 and is slidably connected to the guiding post 30. Through the above settings, it can play a guiding role and facilitate the sliding of the movable member 26.

[0042] In this embodiment, the fixing member 25 is provided with a clamping rod 32. The clamping rod 32 is clamped on the guiding block 10 and the die 11. The clamping rod 32 is provided with a positioning convex portion 33. The guiding block 10 and the die 11 are both provided with positioning grooves 34. The positioning convex portion 33 is arranged on the positioning groove 34.

[0043] A manufacturing method of a split ferrite magnetic core, characterized by comprising the following steps:

[0044] S1. Slide all the die presses 11 upward to open them, and then horizontally insert the movable rod 35 into the die corresponding to the first magnetic core block 1 and fix it. This facilitates the subsequent laying of raw material powder and improves production efficiency.

[0045] S2. After proportioning, mixing, pre-sintering, and ball-milling the raw materials, weigh the raw material powder and place it into the bottom die 9 and level it. The even laying of the raw material powder can ensure consistent pressure inside the bottom die 9 and improve the quality of the manufactured magnetic core.

[0046] S3. Connect the die press 11 to the cylinder, and then start the cylinder to press the die press 11 tightly against the guide block 10. Compact the raw material powder.

[0047] S4. Snap the locking assembly 24 onto the guide block 10 and the die press 11, then tighten the clamping nut 29 to fix it, and then send the die into the furnace for sintering and forming.

[0048] S5. Demold the sintered ferrite magnetic core, and then grind and polish the ferrite magnetic core. The protrusions generated by the sintering of the excess raw material powder are removed through polishing to improve the surface quality of the magnetic core.

[0049] In step S2, the mass of the raw material powder placed into the bottom die 9 should be 1.02 - 1.05 times the mass of the raw material powder designed to be accommodated in the volume of the bottom die 9. By placing more raw material powder than the designed capacity and enabling the excess raw material powder to be pushed into the accommodation holes 19 of the bottom die 9 under pressure, it can ensure that the pressure on the raw material powder inside the bottom die 9 is consistent, the internal density of the sintered magnetic core is consistent, and the quality of the magnetic core is improved.

[0050] The present invention is manufactured by the above method, which can conveniently and quickly produce high-quality magnetic materials with consistent internal density and no bubbles, and has higher production efficiency.

[0051] The above are only specific embodiments of the present invention, but the technical features of the present invention are not limited thereto. Any simple changes, equivalent substitutions, or modifications made based on the present invention to solve substantially the same technical problems and achieve substantially the same technical effects are all covered by the protection scope of the present invention.

Claims

1. A split ferrite core, characterized in that: It includes a first magnetic core block, a second magnetic core block and a magnetic rod, wherein the magnetic rod is fixedly connected to the first magnetic core block, the magnetic rod is provided with a fixing hole extending along the axial direction, the second magnetic core block is provided with a fixing rod, the fixing rod is arranged in the fixing hole, and the two ends of the second magnetic core block are provided with slots, and the two ends of the first magnetic core block are arranged in the slots.

2. A split ferrite core according to claim 1, characterized in that: The first magnetic core block is provided with a through hole, and the through hole is connected with the fixing hole.

3. A split ferrite core mold, characterized in that: It includes a fixed plate, a bottom mold, a guide block and a pressing mold, wherein the bottom mold is arranged on the fixed plate, the bottom mold is provided with a molding groove, the guide block is arranged between the bottom mold and the pressing mold and is fixedly connected to the bottom mold, the guide block is provided with a guide hole, the bottom of the guide hole is connected with the molding groove, and the guide hole is provided with an inclined hole wall.

4. The split ferrite core mold according to claim 3, characterized in that: A pressing rod and a docking block are provided on the top of the pressing die, a sliding block is provided at the end of the pressing rod, a sliding rail is provided on the fixing plate, and the sliding block is arranged in the sliding rail and is slidably connected with the sliding rail.

5. The split ferrite core mold according to claim 3, characterized in that: A accommodating hole is provided at the bottom of the bottom mold, and the accommodating hole is communicated with the forming groove. A compression assembly is provided in the accommodating hole, and the compression assembly includes a movable block, a spring and a fixed block. The movable block, the spring and the fixed block are arranged in the accommodating hole from top to bottom in sequence, the movable block is movably connected to the accommodating hole, and the fixed block is fixed in the accommodating hole.

6. The split ferrite core mold according to claim 3, characterized in that: A locking assembly is provided between the guide block and the die, and the locking assembly includes a fixed part, a movable part and a clamping part. The movable part is provided on the fixed part and movably connected with the fixed part. The clamping part includes a clamping screw and a clamping nut. The clamping screw is passed through the fixed part and the movable part. The clamping nut is threadedly connected to the clamping screw and clamps the fixed part and the movable part.

7. The split ferrite core mold according to claim 6, characterized in that: The fixing member is provided with a guide column, and the movable member is provided with a sleeve. The sleeve is arranged on the guide column and is slidably connected with the guide column.

8. The split ferrite core mold according to claim 6, characterized in that: The fixing member is provided with a clamping rod, the clamping rod is clamped on the guide block and the die, the clamping rod is provided with a positioning protrusion, the guide block and the die are both provided with a positioning groove, and the positioning protrusion is arranged on the positioning groove.

9. A method for manufacturing a split ferrite core, characterized in that The steps include: S1, slide all the dies upward to open them, then horizontally insert a movable rod into the mold corresponding to the first magnetic core block and fix it; S2, after mixing the raw materials in proportion and pre-calcining and ball milling, the raw material powder is weighed and placed in a bottom mold and flattened; S3, connecting the die to the cylinder, and then starting the cylinder to press the die against the guide block; S4, clamp the locking assembly on the guide block and the die, then tighten the clamping nut to fix it, and then send the die into the furnace for sintering; S5, demolding the sintered ferrite core, and then grinding and polishing the ferrite core.

10. The method for manufacturing a split ferrite core according to claim 9, characterized in that: In step S2, the mass of the raw material powder placed in the bottom mold should be 1.02 to 1.05 times the mass of the raw material powder designed to be accommodated in the volume of the bottom mold.

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