CN217485280U - Magnetic core forming die and forming module - Google Patents

Abstract

The utility model discloses a magnetic core forming die and shaping module relates to the magnetic core and makes technical field. The magnetic core forming die provided by the utility model has the advantages that by arranging the die core blocks capable of moving relatively, the magnetic core blank is sleeved outside all the die core blocks, and the conical punch extrudes all the die core blocks to move outwards in the radial direction, so that the magnetic core blank is circumferentially stretched and outwards expanded under the action of the circumferential tensile stress of the die core blocks to form a magnetic core; the magnetic core forming die is simple in structure and easy to operate, can effectively avoid the phenomenon that the magnetic core strip after the existing drawing forming is wound and broken, and improves the product percent of pass; the core forming module can form a plurality of magnetic cores in batches at one time by arranging a plurality of magnetic core forming dies, so that the performance of the magnetic cores in the same batch can be kept consistent, and the production efficiency of the magnetic cores can be improved.

Description

Magnetic core forming die and forming module

Technical Field

The utility model relates to a magnetic core manufacturing technical field especially relates to a magnetic core forming die and shaping module.

Background

In the field of modern power electronic technology, measurement of alternating current, voltage and electric energy is generally carried out by adopting a mutual inductor, wherein a core component in the mutual inductor is a magnetic core, and the performance of the magnetic core directly determines the measurement accuracy of the mutual inductor. When measuring a sine wave current without a direct current component, a magnetic core is generally made of a soft magnetic material with high magnetic permeability to improve the accuracy of measurement. Amorphous and nanocrystalline alloys have excellent soft magnetic properties, and especially nanocrystalline alloys have high saturation magnetic induction, high magnetic permeability and low loss at the same time, and have been widely used for measuring magnetic cores of transformers without direct current components. However, when a sine wave current containing a dc component is measured, in order to avoid saturation of magnetization of the nanocrystalline alloy core due to the dc component, a core having a linear hysteresis loop characteristic is required to realize a dc resistance function, and at the same time, the core needs to have a low remanent polarization and a small coercive force to reduce a measurement error.

In the prior art, to form a nanocrystalline alloy magnetic core with linear hysteresis loop characteristics, a forming mode of drawing and crystallizing heat treatment of a single strip in a tube furnace is generally adopted. US20120262266, US20150255203 and US20160329140 all disclose methods and processes for manufacturing a nano gold alloy core for an anti-dc transformer using a drawing method. The nanocrystalline alloy magnetic core prepared by the method has excellent performance, for example, the nanocrystalline alloy magnetic core has a linear hysteresis loop, and the nonlinearity is less than 3 percent; the relative magnetic permeability of the magnetic core can be adjusted by applying tensile stress, and can be adjusted in the optimal range of 1000-3500; the remanence ratio Jr/Js of the magnetic core is less than 0.1, and the ratio Hc/Hk of the coercive force Hc and the anisotropy field Hk is less than 0.1. However, the nanocrystalline strip prepared and formed by the preparation method is formed by adopting a single drawing mode, so that the requirement on the uniformity of the quenched strip before drawing is good, and because the transverse dimensional tolerance and the longitudinal dimensional tolerance of the quenched strip influence the uniformity of stress in the drawing process of the strip, performance fluctuation and even strip breakage can be caused; and the magnetic core is prepared by winding the magnetic core by adopting the single strip after drawing and heat treatment, the production efficiency is very low, on one hand, the drawing speed of the single strip is very low, the tension and the temperature in the drawing process are not easy to control, the manufacturing process and equipment are very complex, on the other hand, the strip after drawing and crystallization is easy to embrittle, the embrittled strip is wound into the annular magnetic core, the strip breakage is serious, and the production efficiency is also low.

Disclosure of Invention

In order to overcome the prior art at least one kind defect, the utility model discloses a first aim at provides a magnetic core forming die, its simple structure not only, easily operation, and can avoid the magnetic core strip coiling broken band after the current draw forming, improve product percent of pass and production efficiency.

The utility model discloses a reach the technical scheme that above-mentioned purpose adopted and be:

a magnetic core molding die, comprising: the magnetic core forming die comprises a conical punch and a die core assembly, wherein the die core assembly is positioned in a middle cavity of a magnetic core blank which is formed by winding a strip, the die core assembly comprises at least two die core blocks capable of moving relatively, a punched hole matched with the conical punch is arranged between all the die core blocks, the conical punch is inserted into the punched hole and can move in the conical punch, and under the action of external force, the conical punch can move relatively to extrude all the die core blocks to move outwards in the radial direction, so that the magnetic core blank is subjected to circumferential stretching and outward expanding forming to form a magnetic core under the action of circumferential tensile stress of the die core blocks.

The magnetic core forming die provided by the utility model is provided with at least two die core blocks capable of moving relatively, and the magnetic core blank is sleeved outside all the die core blocks, under the action of external force, the conical punch can move relatively in a punching way, for example, the conical punch moves downwards, and the conical punch can extrude all the die core blocks to move outwards in the radial direction, so that the magnetic core blank is subjected to circumferential stretching and outward expanding forming under the action of circumferential tensile stress of the die core blocks to form a magnetic core; not only simple structure, easy to operate, and because this magnetic core forming die need not to carry out heat treatment to the strip before the inflation shaping, can effectively avoid the magnetic core strip coiling broken string phenomenon after the current draw forming, improve product percent of pass and production efficiency, in addition, mold core assembly comprises at least two mold core blocks that can the relative movement, make this magnetic core forming die can be according to the requirement of not unidimensional magnetic core, realize through the displacement distance that the corresponding mold core block quantity of adjustment or the relative punching of adjustment toper drift, strengthen this magnetic core forming die's application scope.

Preferably, the magnetic core blank is annular, and the inner annular surface of the magnetic core blank is tightly attached to the outer peripheral surface of the mold core component.

Preferably, the die core blocks are arc-shaped blocks, and the outer arc surface of each die core block is attached to the inner ring surface of the magnetic core blank.

Preferably, the radians of the outer cambered surfaces of all the die core blocks are equal, the sum of the radians of the outer cambered surfaces of all the die core blocks is 360 degrees, and the inner cambered surfaces of all the die core blocks form the punched hole.

Preferably, the height of the die core block is not less than the height of the magnetic core blank, and both end surfaces of the magnetic core blank cannot extend out of the end surfaces of the die core block.

Preferentially, magnetic core forming die includes the hammering block template, mold core assembly install in hammering block template and can its removal relatively, hammering block template is equipped with keeps away the dead slot, mold core assembly punch a hole and correspond keep away the dead slot, and the back is moved down to the toper drift, its tip can insert keep away the dead slot.

Preferably, the ribbon is an amorphous alloy thin ribbon.

Preferably, after the magnetic core blank is wound by the strip, two ends of the strip are respectively welded on the inner cavity surface and the outer cavity surface of the magnetic core blank.

Based on the same invention concept, the utility model discloses a second aim at provides a magnetic core forming die set that production efficiency is high, batch magnetic core performance uniformity is good.

The utility model adopts the technical proposal that the purpose is achieved: magnetic core shaping module include cope match-plate pattern and a plurality of the aforesaid magnetic core forming die, every mold core assembly all overlaps outward and is equipped with magnetic core material embryo, the bottom surface of cope match-plate pattern is equipped with a plurality of constant head tanks, and the upper end of a plurality of toper drifts is inserted and is realized the location in corresponding constant head tank, and the template is pressed down to external force, and the cope match-plate pattern promotes all toper drifts and moves down the mold core piece radial outwards that the extrusion corresponds simultaneously, and then a plurality of magnetic cores of one-time molding.

The utility model provides a magnetic core shaping module can once only a plurality of magnetic cores of batch shaping, not only makes same batch magnetic core performance unanimous, and can show improvement magnetic core production efficiency, practices thrift manufacturing cost.

Preferably, all the die core assemblies are arranged on the anvil die plate in a sliding mode, the anvil die plate is provided with a plurality of the clearance grooves, punched holes of all the die core assemblies respectively correspond to the corresponding clearance grooves, and after the conical punch moves downwards, the end part of the conical punch can be inserted into the corresponding clearance groove.

To sum up, the utility model provides a magnetic core forming die, magnetic core shaping module and magnetic core forming method have following technological effect:

the magnetic core forming die is characterized in that at least two relatively-movable die core blocks are arranged, a magnetic core blank is sleeved outside all the die core blocks, and a conical punch can move relative to a punched hole under the action of external force, for example, the conical punch moves downwards, and the conical punch can extrude all the die core blocks to move outwards in the radial direction, so that the magnetic core blank is subjected to circumferential stretching and outward expanding under the action of circumferential tensile stress of the die core blocks to form a magnetic core; the magnetic core forming die is simple in structure and easy to operate, and the strip does not need to be subjected to heat treatment before the magnetic core forming die is subjected to expansion forming, so that the phenomenon that the strip of the magnetic core strip is wound and broken after the magnetic core strip is subjected to drawing forming in the prior art can be effectively avoided, and the product percent of pass and the production efficiency are improved; in addition, the mold core assembly is composed of at least two mold core blocks capable of moving relatively, so that the magnetic core forming mold can be realized by adjusting the number of the corresponding mold core blocks or adjusting the moving distance of the conical punch relative to the punched hole according to the requirements of magnetic cores with different sizes, and the application range of the magnetic core forming mold is widened.

Magnetic core shaping module is through setting up cope match-plate pattern and a plurality of magnetic core forming die, a plurality of magnetic cores of disposable batch shaping not only make same batch of magnetic core performance can keep higher uniformity, and can show improvement magnetic core production efficiency, practice thrift manufacturing cost.

Drawings

Fig. 1 is a schematic sectional view of a magnetic core forming mold in embodiment 1 of the present invention;

fig. 2 is a schematic view of a three-dimensional structure of a hidden anvil template of a magnetic core forming mold according to embodiment 1 of the present invention;

fig. 3 is a DSC graph of middle fe73.5cu1nb3si15.5b7 (at.%) amorphous alloy of the present invention;

fig. 4 is a hysteresis loop diagram of a nanocrystalline alloy magnetic core formed by fe73.5cu1nb3si15.5b7 (at.%) amorphous alloy under 1380 kg of pressure in example 1 of the present invention;

fig. 5 is a hysteresis loop diagram of a nanocrystalline alloy magnetic core formed by Fe73.5Cu1Nb3Si15.5B7 (at.%) amorphous alloy under different pressure conditions in example 1 of the present invention;

fig. 6 is a schematic view of a layout structure of a magnetic core forming module according to embodiment 2 of the present invention;

fig. 7 is a magnetic permeability distribution diagram of a nanocrystalline alloy magnetic core formed by Fe73.5Cu1Nb3Si15.5B7 (at.%) amorphous alloy in the same batch in a magnetic core forming module according to embodiment 2 of the present invention.

Wherein the reference numerals have the following meanings:

1-a conical punch;

2-die core block;

3-magnetic core material blank;

4-anvil template.

Detailed Description

For better understanding and implementation, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

Example 1

Referring to fig. 1 and 2, the utility model discloses a magnetic core forming die, including toper drift 1 and mold core assembly, mold core assembly is located and is wound the middle part cavity of the magnetic core material embryo 3 of making by the strip, also is the outer peripheral face of magnetic core material embryo 3 parcel at mold core assembly promptly. In this embodiment, the magnetic core blank 3 is annular, but may be in other shapes, such as square. The strip may be any thin strip material which can be crystallized from an amorphous alloy into a nanocrystalline alloy, specifically, the strip of the present embodiment is a quenched amorphous alloy strip of fe73.5cu1nb3si15.5b7 (at.%), the thickness of the strip is 20nm, the width of the strip is 5mm, and the strip is wound into an annular magnetic core blank 3 with an inner diameter of 12.9mm, an outer diameter of 18.1mm, and a height of 5mm under a constant tension of 1N. Wherein, the tolerance range of the thickness of the amorphous alloy strip is plus or minus 2nm, and the tolerance range of the width of the amorphous alloy strip is plus or minus 0.1 mm; the tolerance range of the inner diameter and the outer diameter of the magnetic core blank 3 is plus or minus 0.1 mm. After the non-alloy strip is wound into the magnetic core blank 3, two ends of the non-alloy strip are respectively welded on the inner ring surface and the outer ring surface of the magnetic core blank 3, so that the magnetic core blank 3 is prevented from being scattered.

As shown in fig. 1 and 2, the core assembly includes at least two core pieces 2 capable of moving relatively, i.e. the core blank 3 is tightly wrapped outside all the core pieces 2. In this embodiment, there are three mold core blocks 2, and all the mold core blocks 2 are arc-shaped blocks, preferably, the radians of the outer arc surfaces of all the mold core blocks 2 are equal, and the outer arc surface of each mold core block 2 is closely attached to the inner ring surface of the magnetic core blank 3, so that the expansion force of each mold core block 2 acting on the magnetic core blank 3 in each direction is balanced. Of course, according to actual requirements, the number of the die core blocks 2 can be set at will, the shapes of the die blocks can be different, and the magnetic core blank 3 can be sleeved outside the die core blocks only by meeting the requirement that the sum of the radians of the outer arc surfaces of all the die core blocks 2 is 360 degrees. The die core assembly is divided into more die core blocks 2, namely the number of the die core blocks 2 is increased, so that the contact surfaces of the outer arc surfaces of the die core blocks 2 after being punched and the inner ring surface of the magnetic core blank 3 are more, and the size of the formed magnetic core is closer to the ideal design size.

As shown in fig. 1 and 2, punched holes matched with the conical punch 1 are arranged between all the die core blocks 2, and in the embodiment, the punched holes are preferably conical punched holes, so that the conical punched holes have more contact surfaces matched with the conical punch 1, and the pressure of the conical punched holes can be smoothly transmitted to the die core blocks 2 and can push the die core blocks to move radially outwards. The inner arc surfaces of all the die core blocks 2 form the conical punched holes, the conical punch 1 is inserted into the conical punched holes, under the action of external force, the conical punch 1 moves downwards in the conical punched holes and can extrude all the die core blocks 2 to move outwards in the radial direction, so that the magnetic core blank 3 is stretched and expanded in the circumferential direction under the action of the tensile stress in the circumferential direction of the die core blocks 2 to form a magnetic core, wherein the circumference increasing range of the inner perimeter or the outer perimeter of the magnetic core after stretching is 5-25%. Of course, all the die core blocks 2 can be moved relative to the conical punch 1 by external force, and the expansion forming of the magnetic core can be realized by only moving the conical punch 1 towards the small-taper end thereof in the conical punched hole and pressing all the die core blocks 2 to move outwards in the radial direction.

The utility model provides a magnetic core forming die, through setting up three mold core pieces 2 that can relative movement, and cover all mold core pieces 2 outside magnetic core material embryo 3, under the external force effect, toper drift 1 moves down, toper drift 1 can extrude all mold core pieces 2 and radially move outwards to make magnetic core material embryo 3 carry out the peripheral tensile under the effect of the tensile stress of circumference of mold core piece 2 and expand outward and shape into the magnetic core; the magnetic core forming die is simple in structure and easy to operate, and the strip does not need to be subjected to heat treatment before the magnetic core forming die is subjected to expansion forming, so that the phenomenon that the strip of the magnetic core strip is wound and broken after the magnetic core strip is subjected to drawing forming in the prior art can be effectively avoided, and the product percent of pass and the production efficiency are improved; in addition, the mold core component comprises at least two mold core blocks 2 capable of moving relatively, so that the magnetic core forming mold can be realized by adjusting the number of the corresponding mold core blocks 2 or adjusting the moving distance of the conical punch 1 relative to the conical punch according to the requirements of magnetic cores with different sizes, the application range of the magnetic core forming mold is enlarged, and the practicability is high.

As shown in fig. 1, the taper angle of the tapered punch 1 is θ, and the expansion molding of magnetic cores of different sizes can be realized by adjusting the magnitude of θ and the moving distance of the tapered punch 1. For example, if theta is small, the moving stroke of the conical punch 1 can be increased to increase the size of the bulge of the die core piece 2, and if theta is large, the moving stroke of the conical punch 1 can be shortened to increase the size of the bulge of the die core piece 2.

As shown in fig. 1, the height of the die core block 2 is h2, the height of the magnetic core blank 3 is h1, so that all inner ring surfaces of the magnetic core blank 3 are attached to the outer ring surface of the die core assembly, h2 is not less than h1, and both upper and lower end surfaces of the magnetic core blank 3 cannot extend out of the upper and lower end surfaces of all the die core blocks 2. In the initial state, the diameter of the mold core component is phi 1, phi 1 is approximately equal to the diameter of the inner ring of the magnetic core blank 3, the diameter of the outer ring of the magnetic core blank 3 is phi 2, and phi 1 and phi 2 can be correspondingly adjusted according to the design size of the magnetic core.

As shown in fig. 1, the magnetic core forming mold further includes an anvil plate 4, the mold core assembly is mounted on the anvil plate 4 and can move relative to the anvil plate 4, the anvil plate 4 is provided with a clearance groove, the tapered punched hole of the mold core assembly corresponds to the clearance groove, and after the tapered punch 1 moves downward, the lower end portion of the tapered punch can be inserted into the clearance groove. Certainly, in order to make the die core block 2 slide smoothly, the anvil die plate 4 may be provided with a sliding rail or a sliding groove, correspondingly, the bottom surface of the die core block 2 is provided with a sliding groove or a sliding rail, and the die core block 2 is matched with the sliding groove through the sliding rail to realize smooth radial sliding on the anvil die plate 4.

As shown in fig. 1 and 2, the method for forming a nano alloy magnetic core by using the magnetic core forming die comprises the following steps:

preparing a magnetic core blank 3: a quenched amorphous alloy ribbon having a thickness of 20nm, a width of 5mm and a composition of Fe73.5Cu1Nb3Si15.5B7 (at.%) was wound into a magnetic core billet 3 having an inner diameter of 12.9mm, an outer diameter of 18.1mm and a height of 5mm while applying a constant tension of 1N to the amorphous alloy ribbon. In addition, the tolerance range of the thickness of the amorphous alloy strip is plus or minus 2nm, and the tolerance range of the width of the amorphous alloy strip is plus or minus 0.1 mm; the tolerance range of the inner diameter and the outer diameter of the magnetic core blank 3 is plus or minus 0.1 mm. The quenched amorphous alloy strip can be prepared by adopting a rapid solidification technology or a plane casting strip technology.

And (3) die filling: sleeving the magnetic core blank 3 outside the mold core assembly, putting the magnetic core forming mold with the magnetic core blank 3 in a hot pressing furnace, vacuumizing the hot pressing furnace, and filling nitrogen to normal pressure.

Pressurizing and heating: as shown in fig. 3, the glass transition temperature Tg of the non-alloy ribbon was determined to be 423.7 ℃, and the initial crystallization temperature Tx of the non-alloy ribbon was determined to be 509.5 ℃, so that the supercooled liquid region of the non-alloy ribbon was determined to be 423.7 ℃ to 509.5 ℃. Heating the magnetic core blank 3 in a hot-pressing furnace to 424 ℃ at a heating rate of 20 ℃/min, and preserving the heat for 10 minutes to realize homogenization of the temperature of the magnetic core blank 3; after the heat preservation is finished, applying 1380 kg of pressure to the conical punch 1 by using a pressure head of the hot pressing furnace, and keeping the pressure constant by a pressure closed-loop control system to move for a preset stroke, wherein the pressure closed-loop control system is the prior art; then, at the heating rate of 10 ℃/min, raising the temperature of the magnetic core material blank 3 to the initial crystallization temperature of 510 ℃, and keeping the temperature and the pressure for 10 minutes to realize full expansion processing in a supercooled liquid phase region; the core was then heated to 550 c at a heating rate of 10 c/min for 10 minutes, during which time the pressure of the conical punch 1 was maintained. In the process, the magnetic core blank 3 induces in-plane transverse anisotropy vertical to the circumferential direction under the action of circumferential external expansion stress of the mold core block 2 to crystallize into nano alloy, and then the nano crystal alloy magnetic core with a linear hysteresis loop is formed.

Cooling and unloading: and after the heat preservation is finished, cooling the nanocrystalline alloy magnetic core at a cooling rate of 20 ℃/min, keeping the pressure of the conical punch 1 unchanged in the cooling process, cooling the nanocrystalline alloy magnetic core to 150 ℃ or below, unloading the pressure of the conical punch 1, and unloading the nanocrystalline alloy magnetic core from the forming die.

And after the formed nanocrystalline alloy magnetic core is naturally cooled to the room temperature, measuring the size and the performance of the nanocrystalline alloy magnetic core. Through measurement, the inner diameter of the nanocrystalline alloy magnetic core is 14.8mm, and the elongation is 14.7%; the outer diameter was 19.9mm, and the elongation was 9.9%. As shown in fig. 4, the magnetic hysteresis loop of the nanocrystalline alloy core has a relative permeability of 1500, a ratio Jr/Js of residual magnetic polarization to saturated magnetic polarization of 0.005, and a ratio Hc/Hk of coercive force Hc to an anisotropic field Hk of 0.003, where Hk is (Hk + + Hk-)/2 and Hk + and Hk-are magnetic field strengths corresponding to the intersection points of the tangent lines of the graph of fig. 4.

Repeating the above magnetic core forming method, only adjusting the pressure F of the hot pressing of the magnetic core blank 3 in the supercooled liquid phase region, and obtaining the nanocrystalline alloy magnetic core with different magnetic conductivities, wherein the hysteresis loop is shown in fig. 5. As can be seen from fig. 5, by adjusting the pressure F, the relative permeability of the nanocrystalline alloy magnetic core can be adjusted between 500-6000, and preferably between 1000-3500, the remanence ratio Jr/Js is less than 0.01, and the ratio Hc/Hk of the coercive force Hc to the anisotropic field Hk is less than 0.01, so that the nanocrystalline alloy magnetic cores formed under different pressures F can both realize the dc resistance function, and simultaneously have low residual magnetic polarization strength and small coercive force, and can reduce the measurement error.

The utility model provides a magnetic core forming method, through the super-cooled liquid phase district that utilizes the metallic glass strip, adopt magnetic core forming die to carry out the inflation plastic working to it, recycle amorphous crystallization temperature and go up crystallization process to make magnetic core material embryo 3 produce with circumference vertically in the face horizontal anisotropy in order to crystallize into nanometer alloy under the effect of the outer expansion stress of circumference, and then make the excellent nanocrystalline alloy magnetic core that has linear hysteresis loop of each item performance, the process is simple, easily operation.

Example 2

The embodiment discloses a magnetic core shaping module, as shown in fig. 6, it includes cope match-plate pattern and a plurality of embodiment 1's magnetic core forming die, every mold core assembly all overlaps outward and is equipped with magnetic core material embryo 3, the bottom surface of cope match-plate pattern is equipped with a plurality of constant head tanks, the upper end of a plurality of toper drifts 1 is inserted and is realized fixing a position in corresponding the constant head tank, template is pressed down to external force, the cope match-plate pattern promotes all toper drifts 1 and moves down simultaneously and extrudees the radial outside removal of corresponding mold core piece 2, and then can once only form a plurality of magnetic cores. The upper surface of the upper template is a plane, so that a pressure head of the hot pressing furnace is attached to the upper template conveniently and applies pressure to the upper template.

Furthermore, all the die core assemblies are arranged on the anvil die plate 4 in a sliding mode, the anvil die plate 4 is provided with a plurality of clearance grooves, the conical punched holes of all the die core assemblies correspond to the corresponding clearance grooves, and after the conical punch 1 moves downwards, the end portion of the conical punch can be inserted into the corresponding clearance groove.

In this embodiment, as shown in fig. 6, 10 × 20 core assemblies are disposed on the anvil plate 4 and arranged in a matrix. The specific forming process of the nanocrystalline alloy magnetic core is as follows:

preparing a plurality of magnetic core blanks 3: a quenched amorphous alloy strip with the thickness of 20nm, the width of 5mm and the composition of Fe73.5Cu1Nb3Si15.5B7 (at.%) is coiled into a plurality of magnetic core blanks 3 with the inner diameter of 12.9mm, the outer diameter of 18.1mm and the height of 5mm for standby under the condition that the constant tension of 1N is applied to the amorphous alloy strip. In addition, the tolerance range of the thickness of the amorphous alloy strip is plus or minus 2nm, and the tolerance range of the width of the amorphous alloy strip is plus or minus 0.1 mm; the tolerance range of the inner diameter and the outer diameter of the magnetic core blank 3 is plus or minus 0.1 mm.

Die filling: and respectively assembling the magnetic core blanks 3 on the mold core components for pairing, specifically as shown in fig. 6, putting the mold core components into a hot pressing furnace, vacuumizing the hot pressing furnace, and filling nitrogen to normal pressure.

Pressurizing and heating: from FIG. 3, it was confirmed that the supercooled liquid region temperature of the above-mentioned unalloyed strip was in the range of 423.7 ℃ to 509.5 ℃. Heating all the magnetic core blanks 3 in a hot pressing furnace at a heating rate of 15 ℃/min, heating to 423 ℃, and preserving heat for 30 minutes to realize homogenization of the temperatures of all the magnetic core blanks 3; after the heat preservation is finished, applying pressure F of 280 tons to the upper template by using a pressure head of the hot pressing furnace, converting the average pressure of each conical punch 1 into 1400 kilograms, and keeping the pressure of the conical punch 1 constant and moving downwards for a preset stroke by using a pressure closed-loop control system of the hot pressing furnace, wherein the pressure closed-loop control system is the prior art; then, at the heating rate of 10 ℃/min, the temperature of the magnetic core material blank 3 is raised to 510 ℃, and the temperature is preserved for 30 minutes to realize the full expansion processing in the supercooled liquid region; and heating the magnetic core blank 3 to 545 ℃ at a heating rate of 10 ℃/min, and keeping the temperature for 30 minutes, wherein the pressure of the conical punch 1 is kept unchanged. In the process, the magnetic core blank 3 induces in-plane transverse anisotropy vertical to the circumferential direction under the action of circumferential external expansion stress of the mold core component to crystallize into nano alloy, and then the nano crystal alloy magnetic core with a linear hysteresis loop is manufactured.

Cooling and pressure relief: and after the heat preservation is finished, cooling the nanocrystalline alloy magnetic core at a cooling rate of 20 ℃/min, keeping the pressure of the conical punch 1 unchanged all the time in the cooling process, cooling the nanocrystalline alloy magnetic core to 150 ℃ or below, unloading the pressure of all the conical punches 1, and unloading all the nanocrystalline alloy magnetic cores from all the die core assemblies.

And after the formed nanocrystalline alloy magnetic core is naturally cooled to the room temperature, measuring the relative permeability of the nanocrystalline alloy magnetic core. The measured relative permeability values of 200 nanocrystalline alloy magnetic cores are shown in FIG. 7, and the average value x of the relative permeability of the heat magnetic core can be calculated according to the permeability data of the 200 magnetic cores _A 1503, the standard deviation of the magnetic permeability is 6.3, and the requirement of consistency of mass production performance is met. Wherein, the standard deviation adopts a formula

Is calculated to obtain, wherein x _i The magnetic core has a permeability, n is 200, and the average value x of the relative permeability _A Is an arithmetic mean of the relative permeability of 200 cores.

The utility model provides a magnetic core shaping module can once only make the nanocrystalline alloy magnetic core performance of same batch can keep higher uniformity in a plurality of nanocrystalline alloy magnetic cores of batch shaping, and can show improvement magnetic core production efficiency, practices thrift manufacturing cost.

The technical means disclosed by the scheme of the present invention is not limited to the technical means disclosed by the above embodiments, but also includes the technical scheme formed by the arbitrary combination of the above technical features. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications are also considered as the protection scope of the present invention.

Claims (10)

1. Magnetic core forming die, its characterized in that, including toper drift and mold core assembly, mold core assembly is located and is wound the middle part cavity of the magnetic core material embryo of making by the strip, mold core assembly includes two piece at least mould core pieces that can move relatively, be equipped with between all mould core pieces with toper drift complex punch a hole, the toper drift inserts and punches a hole and can move in it, under the exogenic action, toper drift relative punching hole removes and can extrude all mold core pieces radial outwards to make the magnetic core material embryo carry out the tensile outer shaping of circumference under the tensile stress effect of circumference of mold core piece and be the magnetic core.

2. The magnetic core forming die of claim 1, wherein the magnetic core blank is annular, and an inner annular surface of the magnetic core blank is tightly attached to an outer peripheral surface of the die core assembly.

3. The magnetic core forming die of claim 2, wherein the die core blocks are arc-shaped blocks, and an outer arc surface of each die core block is attached to an inner annular surface of the magnetic core blank.

4. The magnetic core forming die according to claim 3, wherein the radian of the outer arc surfaces of all the die core blocks are equal, and the sum of the radian of the outer arc surfaces of all the die core blocks is 360 degrees, and the inner arc surfaces of all the die core blocks constitute the punched hole.

5. The magnetic core forming die according to any one of claims 1 to 4, wherein the height of the die core block is not less than the height of the magnetic core blank, and neither end surface of the magnetic core blank can protrude out of the end surface of the die core block.

6. A magnetic core forming die according to any one of claims 1 to 4, wherein the magnetic core forming die comprises an anvil plate, the die core assembly is mounted on the anvil plate and can move relative to the anvil plate, the anvil plate is provided with a clearance groove, the punched hole of the die core assembly corresponds to the clearance groove, and the end of the conical punch can be inserted into the clearance groove after moving downwards.

7. Magnetic core forming die according to any of claims 1-4, wherein the strip is an amorphous alloy thin strip.

8. The magnetic core forming die of any one of claims 1 to 4, wherein after the strip is wound into the magnetic core blank, two ends of the strip are respectively welded to the inner cavity surface and the outer cavity surface of the magnetic core blank.

9. The magnetic core forming module is characterized by comprising an upper template and a plurality of magnetic core forming dies according to any one of claims 1 to 8, wherein the magnetic core blank is sleeved outside each mold core assembly, a plurality of positioning grooves are formed in the bottom surface of the upper template, the upper ends of a plurality of conical punches are inserted into the corresponding positioning grooves to realize positioning, external force is applied to press the upper template downwards, the upper template pushes all the conical punches to simultaneously downwards move to extrude the corresponding mold core blocks to move outwards in the radial direction, and then a plurality of magnetic cores are formed at one time.

10. The magnetic core forming module of claim 9, wherein the magnetic core forming die comprises an anvil plate, all the die core assemblies are slidably disposed on the anvil plate and can move relative to the anvil plate, the anvil plate is provided with a plurality of clearance grooves, the punched holes of each die core assembly correspond to the corresponding clearance groove, and after the conical punch moves downwards, the end of the conical punch can be inserted into the corresponding clearance groove.

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