CN114898964A - Combined inductor and preparation mold and preparation method thereof - Google Patents

Abstract

The present disclosure relates to a combined inductor, a mold for manufacturing the same, and a method for manufacturing the same, wherein the combined inductor comprises: a magnetic core; the enameled coil is electrically connected with the pin; the outer shell is made of a magnetic insulating material, the enameled coil is completely wrapped by the outer shell, the pins are exposed out of the side face of the outer shell, a mounting hole matched with the magnetic core is formed in the middle of the outer shell, and the mounting hole and the enameled coil are arranged coaxially and are positioned on the inner side of the enameled coil; the magnetic core is inserted into the mounting hole and an insulating connecting layer is filled between the magnetic core and the mounting hole so as to connect the magnetic core and the outer shell. The preparation mold and the preparation method are both used for preparing the combined inductor. This openly can avoid enameled coil to shift noise signal appearing in the use, improves inductance numerical value precision and the stability of use, can improve the yield of inductance product simultaneously.

Description

Combined inductor and preparation mold and preparation method thereof

Technical Field

The disclosure relates to the technical field of inductor preparation, in particular to a combined inductor and a preparation mold and a preparation method thereof.

Background

The inductor is a common electronic component for short, and the circuit symbol is "L", and can realize functions of filtering, power regulation, voltage transformation and the like. Current inductance is mostly the integral type structure, mainly includes the enameled coil, establish the magnetic core in the enameled coil with the pin that the enameled coil electricity is connected, cover and play the guard action's shell outside the enameled coil.

At present, the integral inductor is mostly prepared in a dry pressing mode, and the specific method comprises the steps of placing an enameled coil which is wound and welded with copper pins in a die cavity of a die, then pouring magnetic powder into the die cavity, pressing the magnetic powder in the die cavity through an upper die to form the enameled coil, forming a columnar magnetic core at the center of the enameled coil after the magnetic powder is formed, and forming a shell outside the enameled coil and the magnetic core to obtain an integral inductor finished product. The inductor preparation method has the following defects:

firstly, magnetic powder is filled into a die cavity in a dry powder form after being insulated, and is not easy to fill in gaps and central positions of an enameled coil, so that sufficient filling cannot be realized, and therefore, the internal residual air cannot be discharged, the amount of the filled magnetic powder is changed during each processing, gaps are left at the enameled coil in a finished inductor product, and the enameled coil can shift or vibrate to cause noise signals in the use process of the finished inductor product, so that the normal performance of the inductor is influenced;

secondly, in the pressing process, when the magnetic core is formed by pressing, in order to avoid damage to the inner side of the enameled coil, the pressing pressure is generally small, and when the shell is formed by pressing, large pressure needs to be applied, so that the density difference between the shell and the magnetic core in the finished inductor product is large, the external magnetic field of the inductor is not uniform, and errors are brought to the inductance value of the inductor;

thirdly, when the inductance of different inductance values is prepared, the enameled coil with different diameters of the wires can only be replaced, and once the enameled coil is formed, the enameled coil is buried in the packaged magnetic powder, so that the enameled coil cannot be replaced to change or adjust the inductance value.

Disclosure of Invention

In order to solve the above problems in the prior art, an object of the present disclosure is to provide a combined inductor, a second object of the present disclosure is to provide a mold for manufacturing a combined inductor, and a third object of the present disclosure is to provide a method for manufacturing a combined inductor. This openly can avoid enameled coil to shift noise signal appearing in the use, improves inductance numerical value precision and the stability of use, can improve the yield of inductance product simultaneously.

The combined inductor of the present disclosure includes:

a magnetic core;

the enameled coil is electrically connected with the pin;

the outer shell is made of a magnetic insulating material, the enameled coil is completely wrapped by the outer shell, the pins are exposed out of the side face of the outer shell, a mounting hole matched with the magnetic core is formed in the middle of the outer shell, and the mounting hole and the enameled coil are arranged coaxially and are positioned on the inner side of the enameled coil;

the magnetic core is inserted into the mounting hole and an insulating connecting layer is filled between the magnetic core and the mounting hole so as to connect the magnetic core and the outer shell.

The present disclosure provides a mold for manufacturing a combined inductor, which is used for manufacturing the combined inductor, and includes:

the combined inductor comprises a lower die, a die cavity for containing materials is formed in the lower die, a fixing column is formed in the middle of the bottom surface of the die cavity in an upward extending mode, and the fixing column is the same as the magnetic core of the combined inductor in shape and size;

the upper die is arranged above the die cavity in a vertically sliding mode and used for sliding downwards to stretch into the die cavity to compress materials, and the lower surface of the upper die is provided with a position avoiding groove matched with the fixing column at a position corresponding to the fixing column.

The method for preparing the combined inductor applies the mold for preparing the combined inductor, and comprises the following steps:

s01, preparing a magnetic core and an enameled coil with pins for later use;

s02, placing the obtained enameled coil into a die cavity, and sleeving the enameled wire on the outer side of the fixed column;

s03, pouring a proper amount of magnetic powder into the die cavity, and enabling the enameled coil to be wrapped by the magnetic powder;

s04, pressing the upper die downwards to enable the upper die to extend into the die cavity to compress the magnetic powder, compressing and forming the magnetic powder, demolding to obtain a semi-finished inductor with a mounting hole in the middle, and taking out the semi-finished inductor;

and S05, placing the magnetic core obtained in the step S01 into the mounting hole of the semi-finished inductor, enabling the magnetic core to be flush with the upper end surface and the lower end surface of the semi-finished inductor, and connecting the magnetic core with the semi-finished inductor to obtain the finished inductor.

Preferably, the step S05 is specifically:

and step S01, coating adhesive on the outer side surface of the magnetic core obtained in the step S01, then placing the magnetic core into the mounting hole of the obtained semi-finished inductor, enabling the magnetic core to be flush with the upper end surface and the lower end surface of the semi-finished inductor correspondingly, and connecting the magnetic core and the semi-finished inductor through the adhesive.

Preferably, the adhesive is heat-resistant glue, heat-dissipation coating composite glue, high-molecular glue or mixture glue.

Preferably, in the step S01, the raw material of the magnetic core is manganese-zinc-ferrite MnO-ZnO-Fe ₂ O ₃ NiO-ZnO-Fe of nickel-zinc ferrite ₂ O ₃ Manganese-magnesium-zinc ferrite MnO-MgO-ZnO-Fe ₂ O ₃ Iron powder Fe, iron silicon Fe-3Si, iron nickel Fe-50Ni, iron cobalt vanadium Fe-50Si-1V, iron silicon chromium powder Fe-3Si-6Cr, iron silicon aluminum Fe-3Si-6Al or stainless steel Fe-Cr-Ni.

Preferably, the manganese-zinc ferrite MnO-ZnO-Fe ₂ O ₃ The ferrite contains 50-99 wt% of ferrite Fe ₂ O ₃ And the balance being additives; the nickel-zinc ferrite NiO-ZnO-Fe ₂ O ₃ The ferrite contains 50-99 wt% of ferrite Fe ₂ O ₃ And the balance being additives; the manganese-magnesium-zinc ferrite MnO-MgO-ZnO-Fe ₂ O ₃ The ferrite contains 50-99 wt% of ferrite Fe ₂ O ₃ And the balance being additives; the Fe-Si Fe-3Si comprises 95-99 wt% of Fe and the balance of Si; the Fe-Ni-Fe-50 Ni comprises 49-51 wt% Fe and the balance Ni; the Fe-Co-V-Fe-50 Si-1V comprises 48-50 wt% of Co, 0.5-1 wt% of V and the balance Fe; the Fe-Si-Cr powder Fe-3Si-6Cr comprises 3-4 wt% of Si, 5-7 wt% of Cr and the balance Fe; the Fe-Si-Al Fe-3Si-6Al comprises 3-4 wt% of Si, 5-7 wt% of Al and the balance of Fe; the stainless steel Fe-Cr-Ni comprises 1-16 wt% of Cr, 1-16 wt% of Ni, and the balance Fe.

Preferably, in step S01, the preparing the magnetic core specifically includes:

adding a proper amount of adhesive into the raw materials, fully mixing the raw materials and the adhesive, and then performing injection, pressing or extrusion molding to obtain the magnetic core.

Preferably, in the step S01, the prepared magnetic core is cylindrical, conical or stepped cylindrical; the shape and size of the fixing post of the preparation mold in step S02 are the same as those of the magnetic core.

The combined inductor and the preparation mold and the preparation method thereof have the advantages that:

1. the magnetic core and the outer shell are of a split structure and are connected through the insulating connecting layer filled inside, and the magnetic core and the outer shell can be formed through split pressing, so that compression parameters in the independent pressing process can be unified, magnetic powder can be fully filled in gaps and central positions of enameled coils, gaps at the enameled coils are reduced, and the insulating connecting layer is filled between the magnetic core and the outer shell, so that the gaps can be further reduced, the enameled coils and magnetism are tightly and stably arranged, noise signals caused by displacement or vibration of the enameled coils in the using process are reduced or avoided, and the normal using performance of an inductor is ensured;

2. according to the split type processing mode, when the outer shell is formed by pressing the exterior of the enameled coil, the magnetic core is not required to be formed by pressing the center position inside the enameled coil, so that the problem that the inner side of the enameled coil is damaged when the pressure of the center position is too large is not required to be worried about, pressure parameters of all positions when the outer shell is formed by pressing can be kept consistent, so that the overall texture and the density of the outer shell are uniform, on the other hand, the same material and pressure parameters as those of the outer shell can be adopted when the magnetic core is formed by pressing, so that the densities of the magnetic core and the outer shell are close or equal, so that the densities of all parts of an assembled inductance product are close or even equal, the external magnetic field of the inductance is uniform, and the accuracy of the inductance value is ensured;

3. this magnetic core and shell body are split type structure, can make different materials, the magnetic core of different shape sizes is supporting with the shell body, can make up according to the inductance value of demand, and is more nimble convenient during the assembly, can prepare the inductance of multiple different specifications, and the suitability is more extensive.

Drawings

Fig. 1 is a schematic structural diagram of a combined inductor according to the present disclosure;

fig. 2 is a schematic structural diagram of a mold for manufacturing a combined inductor according to the present disclosure;

fig. 3 is a schematic diagram of step S02 in the method for manufacturing a combined inductor according to the present disclosure;

fig. 4 is a schematic diagram of step S03 in the method for manufacturing a combined inductor according to the present disclosure;

fig. 5 is a schematic diagram of step S04 in the method for manufacturing a combined inductor according to the present disclosure;

fig. 6 is a schematic structural diagram of a semi-finished inductor manufactured in step S04 in the method for manufacturing a combined inductor according to the present disclosure;

fig. 7 is a schematic diagram of step S05 in the method for manufacturing a combined inductor according to the present disclosure;

fig. 8 is a schematic structural diagram of a finished inductor manufactured in step S05 in the method for manufacturing a combined inductor according to the present disclosure.

Description of the reference numerals: 1-magnetic core, 2-enameled coil, 3-outer shell, 31-mounting hole, 4-insulating connecting layer, 5-preparation mold, 51-lower mold, 511-mold cavity, 512-fixed column, 52-upper mold, 521-avoiding groove and 6-magnetic powder.

Detailed Description

As shown in fig. 1, a combined inductor according to the present disclosure includes

The magnetic core 1, the magnetic core 1 is a column body made of magnetic insulating material.

The enameled coil 2 is of a multi-turn wire wrapping structure, an insulating wire skin is formed outside the wire, and two ends of the enameled coil 2 are electrically connected with tinned copper pins after being peeled for being electrically connected with an external circuit.

The outer shell 3 is generally a cuboid structure and made of a magnetic insulating material, the outer shell 3 completely wraps the enameled coil 2, and the end of a pin connected with the enameled coil 2 is exposed on the side face of the outer shell 3 so as to facilitate the electrical connection of an external circuit. The middle part of outer casing 3 is formed with the mounting hole 31 with magnetic core 1 looks adaptation, and the mounting hole 31 runs through outer casing 3 along thickness direction, and the mounting hole 31 sets up with enameled coil 2 coaxial and is located enameled coil 2's inboard for insert magnetic core 1.

The magnetic core 1 and the outer shell 3 are of a split structure, the magnetic core 1 is inserted into the mounting hole 31, an insulating connecting layer 4 is filled between the magnetic core 1 and the mounting hole 31, and the magnetic core 1 and the outer shell 3 are connected through the insulating connecting layer 4.

Foretell combination formula inductance is split type structure between magnetic core 1 and shell body 3, the enameled coil 2, can form shell body 3 back in the outside suppression of enameled coil 2, reserves mounting hole 31 at the middle part, then packs into mounting hole 31 with the magnetic core 1 of independent suppression again, realizes shell body 3 and magnetic core 1's independent processing.

In order to manufacture the combined inductor, the embodiment further provides a mold 5 for manufacturing the combined inductor, as shown in fig. 2, which includes:

the lower die 51, the lower die 51 is internally provided with a die cavity 511 which is opened at the upper part and is used for containing materials, and the die cavity 511 is generally in a square cavity structure and is used for forming the outer shell 3 in a cuboid shape. The middle of the bottom surface of the die cavity 511 extends upwards to form a fixing column 512, the fixing column 512 is the same as the magnetic core 1 of the combined inductor in shape and size, namely the fixing column 512 can be used for sleeving and fixing the enameled coil 2, and when the enameled coil 2 is sleeved for pressing, a mounting hole 31 matched with the shape and size of the magnetic core 1 can be formed in the middle of the outer shell 3.

The upper die 52 and the upper die 52 are matched with the die cavity 511 in shape, the upper die 52 is slidably arranged above the die cavity 511 up and down and is used for sliding downwards to extend into the die cavity 511 to compress materials, and specifically, the upper die 52 can be driven by a conventional hydraulic or oil pressure mechanism to slide up and down and compress the materials when being pressed into the die cavity 511. The lower surface of the upper die 52 is provided with a position avoiding groove 521 matched with the fixing column 512 at a position corresponding to the fixing column 512, so that the fixing column 512 is accommodated for avoiding in the process of pressing down the upper die 52.

The preparation mold 5 of the combined inductor can be used for pressing the outer part of the enameled coil 2 to form the outer shell 3 with the mounting hole 31 in the middle, and then the magnetic core 1 is inserted into the mounting hole 31 to be connected, so that the preparation and assembly of the combined inductor can be completed.

In order to use the above-mentioned mold 5 to prepare the above-mentioned combined inductor, this embodiment further provides a method for preparing a combined inductor, which includes the following steps:

s01, preparing the magnetic core 1 and the enameled coil 2 with pins for use, the magnetic core 1 may be formed by injection, pressing or extrusion, depending on the material of the magnetic core 1 used for the magnetic core 1. The enameled coil 2 can be formed by wrapping a wire, and is externally connected with a tinned copper pin after being peeled at the end part of the wire.

S02, as shown in fig. 3, placing the enameled coil 2 into the mold cavity 511, so that the enameled coil 2 is sleeved on the outer side of the fixing column 512;

s03, as shown in fig. 4, a proper amount of magnetic powder 6 is poured into the mold cavity 511 so that the magnetic powder 6 is over the top of the enameled coil 2 by a certain height to make the magnetic powder 6 completely wrap the enameled coil 2.

S04, as shown in fig. 5, pressing down the upper die 52 to make the upper die 52 extend into the die cavity 511, the lower surface of the upper die 52 contacts with the magnetic core 1 powder and presses the magnetic core 1 powder downwards to compact the magnetic core 1 powder, the upper die 52 applies a certain pressure to compress the magnetic core 1 powder to a designated density, because of the structure of the fixing post 512 arranged in the middle of the lower die 51, the magnetic core 1 powder cannot be filled in the middle of the enameled coil 2, so that the mounting hole 31 with the same shape and size as the fixing post 512 is left in the middle of the outer shell 3, and the semi-finished inductor with the mounting hole 31 in the middle as shown in fig. 6 is obtained by demolding and taken out.

S05, as shown in fig. 7, the magnetic core 1 obtained in the step S01 is installed in the installation hole 31 of the semi-finished inductor, so that the magnetism is flush with the upper and lower end surfaces of the semi-finished inductor, and the magnetic core 1 is connected with the semi-finished inductor, so as to obtain the finished inductor shown in fig. 8.

The utility model discloses a magnetic core 1 is split type structure with shell body 3, insulating articulamentum 4 through inside packing is connected, detachable suppression forms magnetic core 1 and shell body 3, can make the compression parameter unified in the solitary pressing process like this, make magnetic powder 6 can fully fill clearance and the central point to enamelled coil 2, reduce the clearance of enamelled coil 2 department, and fill between magnetic core 1 and the shell body 3 through insulating articulamentum 4, can further reduce the clearance, make closely firm between enamelled coil 2 and the magnetism, it shifts or vibrations phenomenon causes noise signal to reduce or avoid enamelled coil 2 to appear in the use, ensure the normal performance of inductance.

This is disclosed owing to adopt split type processing's mode, when enameled coil 2 outside suppression forms shell body 3, owing to need not to put the suppression at the inside central point of enameled coil 2 and form magnetic core 1, also need not worry the problem that damages enameled coil 2 inboard when central point puts too big pressure yet, the pressure parameter that can make each position when suppression forms shell body 3 keeps unanimous, so that the whole texture of shell body 3 and density are even, on the other hand, can adopt the same material and pressure parameter with shell body 3 when suppression forms magnetic core 1, make magnetic core 1 and shell body 3's density close or equal, just so make the density of the inductance product of post assembling close or even equal, make the external magnetic field of inductance even, thereby the precision of its inductance value has been guaranteed.

This magnetic core 1 and shell body 3 are split type structure, can make different materials, different shape and size's magnetic core 1 and shell body 3 are supporting, can make up according to the inductance value of demand, and it is more nimble convenient during the assembly, can prepare the inductance of multiple different specifications, and the suitability is more extensive.

Further, in this embodiment, step S05 specifically includes:

and (4) after the adhesive is uniformly coated on the outer side surface of the magnetic core 1 obtained in the step (S01), inserting the magnetic core 1 into the mounting hole 31 of the semi-finished inductor to enable the magnetic core 1 to be flush with the upper end surface and the lower end surface of the semi-finished inductor correspondingly, and forming an insulating connecting layer 4 after the adhesive is dried by air to bond the magnetic core 1 with the semi-finished inductor. Through the mode that the adhesive bonds, have the connection firm, convenient assembling's advantage, and liquid adhesive inserts the mounting hole 31 back in at magnetic core 1, mobile packing to clearance everywhere, and then makes magnetic core 1, enameled coil 2 be connected closely firmly with shell body 3, can further reduce or avoid enameled coil 2 to appear shifting or shake the phenomenon and cause the noise signal in the use, ensures the normal performance of inductance.

Further, in this embodiment, the adhesive is a common adhesive such as a heat-resistant adhesive, a heat-dissipating coating composite adhesive, a polymer adhesive or a mixture adhesive, and the above adhesives have good adhesion and fluidity.

Further, in this example, in step S01, the raw material of the magnetic core 1 is manganese-zinc-ferrite MnO-ZnO-Fe ₂ O ₃ NiO-ZnO-Fe of nickel-zinc ferrite ₂ O ₃ Manganese-magnesium-zinc ferrite MnO-MgO-ZnO-Fe ₂ O ₃ Any one of iron powder Fe, iron silicon Fe-3Si, iron nickel Fe-50Ni, iron cobalt vanadium Fe-50Si-1V, iron silicon chromium powder Fe-3Si-6Cr, iron silicon aluminum Fe-3Si-6Al or stainless steel Fe-Cr-Ni.

More specifically, the magnetic core 1 can be prepared by adopting the following raw materials and processes:

manganese zinc ferrite MnO-ZnO-Fe ₂ O ₃ The ferrite contains 50-99 wt% of ferrite Fe ₂ O ₃ And the balance is conventional additive, 1-45% of adhesive is added into the raw materials, when the volume ratio of the added adhesive is lower, such as 1-3%, the magnetic core 1 can be formed by pressing, and when the volume ratio of the added adhesive is higher, the magnetic core 1 can be formed by extruding or injecting magnetic powder.

NiO-ZnO-Fe of adopted nickel-zinc ferrite ₂ O ₃ The ferrite contains 50-99 wt% of ferrite Fe ₂ O ₃ And the balance is conventional additive, 1-45% of adhesive is added into the raw materials, when the volume ratio of the added adhesive is lower, such as 1-3%, the magnetic core 1 can be formed by pressing, and when the volume ratio of the added adhesive is higher, the magnetic core 1 can be formed by extruding or injecting magnetic powder.

The adopted manganese-magnesium-zinc ferrite MnO-MgO-ZnO-Fe ₂ O ₃ The ferrite contains 50-99 wt% of ferrite Fe ₂ O ₃ And the balance being conventional additives. The raw materials are added with 1-45% of the adhesive by volume, when the volume of the added adhesive is low, such as 1-3%, the adhesive can be pressed to form the magnetic core 1, and when the volume of the added adhesive is high, the magnetic core 1 can be formed by extruding or injecting magnetic powder.

The iron powder Fe used comprises water-atomised iron powder and carbonyl iron powder, which contains 0.5 wt.% of conventional additives. And adding a binder with the volume ratio of 10-55% of the raw materials into the raw materials, and extruding or injection molding to form the magnetic core 1.

The Fe-Si Fe-3Si used contains 95-99 wt% Fe and the balance Si. And adding a binder with the volume ratio of 10-55% of the raw materials into the raw materials, and extruding or injection molding to form the magnetic core 1.

The Fe-Ni-Fe-50 Ni is 49-51 wt% Fe, and the balance Ni. And adding a binder with the volume ratio of 10-55% of the raw materials into the raw materials, and extruding or injection molding to form the magnetic core 1.

The Fe-Co-V-Fe-50 Si-1V used comprises 48-50 wt% of Co, 0.5-1 wt% of V, and the balance Fe. And adding a binder with the volume ratio of 10-55% of the raw materials into the raw materials, and extruding or injection molding to form the magnetic core 1.

The adopted Fe-Si-Cr powder Fe-3Si-6Cr comprises 3-4 wt% of Si, 5-7 wt% of Cr and the balance of Fe. And adding a binder with the volume ratio of 10-55% of the raw materials into the raw materials, and extruding or injection molding to form the magnetic core 1.

The Fe-Si-Al Fe-3Si-6Al used comprises 3-4 wt% of Si, 5-7 wt% of Al and the balance of Fe. And adding a binder with the volume ratio of 10-55% of the raw materials into the raw materials, and extruding or injection molding to form the magnetic core 1.

The stainless steel Fe-Cr-Ni comprises 1-16 wt% of Cr, 1-16 wt% of Ni, and the balance Fe. And adding a binder with the volume ratio of 10-55% of the raw materials into the raw materials, and extruding or injection molding to form the magnetic core 1.

According to the preparation process, a proper amount of adhesive is added according to the types of the raw materials, and the magnetic core 1 with uniform texture and regular shape can be prepared through the corresponding forming process.

Further, in this embodiment, the magnetic core 1 may be a common cylindrical shape, and may also be a conical shape or a stepped cylindrical shape, the shape and size of the fixing column 512 of the preparation mold 5 in step S02 are the same as those of the magnetic core 1, and the magnetic core 1 and the outer shell 3 are pressed separately, so that cores with diversified shapes can be prepared and formed without being limited by overall pressing, and diversified preparation requirements are met.

In the description of the present disclosure, it is to be understood that the orientation or positional relationship indicated by the directional terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc., are generally based on the orientation or positional relationship shown in the drawings, and are used for convenience in describing and simplifying the present disclosure, and in the absence of a contrary explanation, these directional terms are not intended to indicate and imply that the device or element being referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore, should not be considered as limiting the scope of the present disclosure.

Various other modifications and changes may be made by those skilled in the art based on the above-described technical solutions and concepts, and all such modifications and changes should fall within the scope of the claims of the present disclosure.

Claims (9)

1. A combined inductor, comprising:

a magnetic core;

the enameled coil is electrically connected with the pin;

the outer shell is made of a magnetic insulating material, the enameled coil is completely wrapped by the outer shell, the pins are exposed out of the side face of the outer shell, a mounting hole matched with the magnetic core is formed in the middle of the outer shell, and the mounting hole and the enameled coil are arranged coaxially and are positioned on the inner side of the enameled coil;

the magnetic core is inserted into the mounting hole and an insulating connecting layer is filled between the magnetic core and the mounting hole so as to connect the magnetic core and the outer shell.

2. A mold for manufacturing a combined inductor according to claim 1, comprising:

the combined inductor comprises a lower die, a die cavity for containing materials is formed in the lower die, a fixing column is formed in the middle of the bottom surface of the die cavity in an upward extending mode, and the fixing column is the same as the magnetic core of the combined inductor in shape and size;

the upper die is arranged above the die cavity in a vertically sliding mode and used for sliding downwards to stretch into the die cavity to compress materials, and the lower surface of the upper die is provided with a position avoiding groove matched with the fixing column at a position corresponding to the fixing column.

3. A method for manufacturing a combined inductor, which applies the mold for manufacturing a combined inductor according to claim 2, for manufacturing a combined inductor according to claim 1, comprising the steps of:

s01, preparing a magnetic core and an enameled coil with pins for later use;

s02, placing the obtained enameled coil into a die cavity, and sleeving the enameled wire on the outer side of the fixed column;

s03, pouring a proper amount of magnetic powder into the die cavity, and enabling the enameled coil to be wrapped by the magnetic powder;

s04, pressing the upper die downwards to enable the upper die to extend into the die cavity to compress the magnetic powder, compressing and forming the magnetic powder, demolding to obtain a semi-finished inductor with a mounting hole in the middle, and taking out the semi-finished inductor;

and S05, placing the magnetic core obtained in the step S01 into the mounting hole of the obtained semi-finished inductor, enabling the magnetic core to be flush with the upper end surface and the lower end surface of the semi-finished inductor, and connecting the magnetic core with the semi-finished inductor to obtain the finished inductor.

4. The method for preparing the combined inductor according to claim 3, wherein the step S05 specifically comprises:

and S01, coating adhesive on the outer side surface of the magnetic core obtained in the step S01, then loading the magnetic core into the mounting hole of the obtained semi-finished inductor, enabling the magnetic core to be flush with the upper end surface and the lower end surface of the semi-finished inductor correspondingly, and connecting the magnetic core with the semi-finished inductor through the adhesive.

5. The method for manufacturing a combined inductor according to claim 4, wherein the adhesive is a heat-resistant adhesive, a heat-dissipating composite coating adhesive, a polymer adhesive, or a mixture adhesive.

6. The method as claimed in claim 3, wherein in step S01, the magnetic layer is formed byThe raw material of the core is manganese zinc ferrite MnO-ZnO-Fe ₂ O ₃ NiO-ZnO-Fe of nickel-zinc ferrite ₂ O ₃ Manganese-magnesium-zinc ferrite MnO-MgO-ZnO-Fe ₂ O ₃ Iron powder Fe, iron silicon Fe-3Si, iron nickel Fe-50Ni, iron cobalt vanadium Fe-50Si-1V, iron silicon chromium powder Fe-3Si-6Cr, iron silicon aluminum Fe-3Si-6Al or stainless steel Fe-Cr-Ni.

7. The method of claim 6, wherein the Mn-Zn ferrite MnO-ZnO-Fe ₂ O ₃ The ferrite contains 50-99 wt% of ferrite Fe ₂ O ₃ And the balance being additives; the nickel-zinc ferrite NiO-ZnO-Fe ₂ O ₃ The ferrite contains 50-99 wt% of ferrite Fe ₂ O ₃ And the balance being additives; the manganese-magnesium-zinc ferrite MnO-MgO-ZnO-Fe ₂ O ₃ The ferrite contains 50-99 wt% of ferrite Fe ₂ O ₃ And the balance being additives; the Fe-Si Fe-3Si comprises 95-99 wt% of Fe and the balance of Si; the Fe-Ni-Fe-50 Ni comprises 49-51 wt% Fe and the balance Ni; the Fe-Co-V-Fe-50 Si-1V comprises 48-50 wt% of Co, 0.5-1 wt% of V and the balance Fe; the Fe-Si-Cr powder Fe-3Si-6Cr comprises 3-4 wt% of Si, 5-7 wt% of Cr and the balance Fe; the Fe-Si-Al Fe-3Si-6Al comprises 3-4 wt% of Si, 5-7 wt% of Al and the balance of Fe; the stainless steel Fe-Cr-Ni comprises 1-16 wt% of Cr, 1-16 wt% of Ni, and the balance Fe.

8. The method for preparing the combined inductor according to claim 6 or 7, wherein in the step S01, the preparing the magnetic core specifically comprises:

adding a proper amount of adhesive into the raw materials, fully mixing the raw materials and the adhesive, and then performing injection, pressing or extrusion molding to obtain the magnetic core.

9. The method for preparing a combined inductor according to claim 3, wherein in step S01, the prepared magnetic core is cylindrical, conical or stepped cylindrical; the shape and size of the fixing post of the preparation mold in step S02 are the same as those of the magnetic core.

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