A preparation method of a laminated amorphous and nanocrystalline core

Abstract

The application provides a preparation method of a laminated amorphous and nanocrystalline core. Amorphous and nanocrystalline alloy strips are cut into a plurality of amorphous and nanocrystalline alloy single pieces with the same shape according to the cross-sectional design of the core. The cut amorphous and nanocrystalline alloy single pieces are stacked and pressed by using an automatic lamination device to obtain a lamination combination of an amorphous and nanocrystalline laminated piece and a lamination jig. Then, the lamination combination is subjected to heat treatment, paint dipping and curing treatment. The amorphous and nanocrystalline laminated piece after curing and shaping is disassembled from the lamination jig to obtain a core blank, and the core blank is subjected to surface treatment to obtain a finished core. The preparation method in the application is a lamination fixing method. The amorphous and nanocrystalline core prepared by the method has lower core loss and soft magnetic characteristics than the amorphous and nanocrystalline core prepared by a conventional method, is suitable for efficient mass production, has a short preparation process and can utilize remelting of waste strips to effectively reduce production cost.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of magnetic circuit components of electric machines, and particularly relates to a preparation method of a stacked non-crystalline and nanocrystalline iron core. BACKGROUND

[0002] Electric machines are the highest power consumption electrical equipment in the world, and improving the efficiency of electric machines is of great significance to energy saving and emission reduction, energy shortage relief and environmental pollution. The improvement of the efficiency of electric machines is highly valued by countries all over the world, and more and more application fields have put forward higher requirements for the performance of electric machines, such as aerospace, electric vehicles, robots, high-speed compressors, high-speed flywheel energy storage, turbo molecular pumps, high-speed machine tools and other application fields. Not only are electric machines required to have high power density or high speed, but also are required to have high efficiency. To achieve high power density or high speed of electric machines, the frequency of electric machines must be improved. However, with the increase of the frequency of electric machines, the core loss of electric machines will increase sharply, which seriously affects the efficiency of electric machines.

[0003] Traditional electric machine cores are mostly made of silicon steel cores, but the silicon steel core has high core loss and serious core heating. With the wide application of high-speed and high-frequency electric machines, the traditional silicon steel core has gradually failed to meet the use requirements of high-speed and high-frequency electric machines. A new material is needed to replace the silicon steel material to prepare the core. Compared with the traditional silicon steel material, the non-crystalline and nanocrystalline alloy has the advantages of high magnetic permeability and low loss, and has shown good application advantages and prospects in high-speed and high-frequency electric machines. For example, Chinese patent CN105118653A "Preparation method of non-crystalline alloy core for electric machines and transformers" proposes a method: first, double-sided coating treatment is performed on the non-crystalline alloy strip, then the coated non-crystalline alloy strip is dried, the non-crystalline alloy strip is cut, and the stack or the core blank is pressed or wound into a core blank, the core blank is fixed in a clamp and heated / annealed / solidified, and finally surface coating treatment is performed to form the required core part. However, the preparation process is too complex, and the coating process requires high requirements. In addition, the existing preparation of non-crystalline and nanocrystalline electric machine cores also adopts the preparation process of "strip pressing forming-heat treatment-paint dipping and solidification-wire cutting". This preparation method usually winds the strip into a magnetic ring or punches it into a sheet stack, then presses it into a magnetic block on a fixed clamp, and then performs a series of heat treatment, paint dipping and solidification, wire cutting and other processes to finally obtain the core. However, the method has the disadvantages of long processing time, high cost, and is not suitable for batch and large-scale production and application. Moreover, the cutting waste in the production process cannot be recycled, resulting in serious waste of raw materials and increasing the production cost. SUMMARY

[0004] In view of the problems in the prior art, the present application aims to provide a preparation method of laminated amorphous and nanocrystalline core, which cuts amorphous and nanocrystalline alloy strip into a plurality of amorphous and nanocrystalline alloy single pieces with the same shape according to the cross-sectional design of the core, and stacks and presses the cut amorphous and nanocrystalline alloy single pieces by using an automatic laminating device to obtain a laminated combination of amorphous and nanocrystalline laminated pieces and a laminated jig, then performs heat treatment, paint dipping and curing treatment on the laminated combination, disassembles the amorphous and nanocrystalline laminated pieces after curing and shaping from the laminated jig to obtain a core blank, and performs surface treatment on the core blank to obtain a core finished product.

[0005] Preferably, the preparation method comprises the following steps:

[0006] Step S1, slicing: cutting amorphous and nanocrystalline alloy strip according to the cross-sectional shape and size of the core finished product to obtain a plurality of amorphous and nanocrystalline alloy single pieces with the same shape and size as the cross section of the core finished product;

[0007] Step S2, laminating: stacking each amorphous and nanocrystalline alloy single piece on the laminated jig in sequence to form an amorphous and nanocrystalline laminated piece, then placing the amorphous and nanocrystalline laminated piece and the laminated jig on a workbench in the automatic laminating device, and compacting and preliminarily shaping the amorphous and nanocrystalline laminated piece by the automatic laminating device to obtain a laminated combination;

[0008] Step S3, heat treatment: placing the laminated combination in a heat treatment furnace for heat treatment;

[0009] Step S4, paint dipping treatment: placing the laminated combination after heat treatment in a vacuum pressure paint dipping device for paint dipping treatment;

[0010] Step S5, curing and shaping: baking and curing the laminated combination after paint dipping, then disassembling the amorphous and nanocrystalline laminated piece after curing and shaping from the laminated jig to obtain a core blank;

[0011] Step S6, surface treatment: removing redundant insulating paint on the surface of the core blank, and performing surface loss reduction treatment and surface protection treatment on the core blank to obtain a core finished product.

[0012] Preferably, the base of the laminated jig is provided with at least one set of laminating positioning devices and at least one handle, and each set of laminating positioning devices comprises at least one outer positioning column and one middle positioning column.

[0013] Preferably, each of the amorphous, nanocrystalline alloy single pieces is provided with a center hole, and each of the outer rings of the amorphous, nanocrystalline alloy single pieces is provided with at least one notch, and in the step S2, the notches of the amorphous, nanocrystalline alloy single pieces are respectively clamped into the outer positioning columns, and the center holes of the amorphous, nanocrystalline alloy single pieces are respectively penetrated into the middle positioning columns, to form the amorphous, nanocrystalline stack.

[0014] Preferably, the lamination device comprises a workbench, a stack jig, a pressing mechanism and a screwing mechanism, the stack jig is placed on the workbench, a pressing mechanism is arranged above the stack jig, and a screwing mechanism is arranged above the pressing mechanism, and in the step S2, a pressing block and a pressing nut are sequentially penetrated into the middle positioning columns, then the pressing mechanism is controlled to extrude the pressing block for compaction treatment, and the screwing mechanism is controlled to tighten the pressing nut for preliminary shaping treatment, to obtain the lamination assembly.

[0015] Preferably, the step S5 comprises:

[0016] In the step S51, the lamination assembly after paint immersion treatment is baked at a temperature of 130-200℃, and is kept for 1-8 hours.

[0017] In the step S52, the lamination assembly after baking treatment is cooled to room temperature, and then the lamination assembly is disassembled to obtain the core blank.

[0018] Preferably, in the step S1, the cutting mode of the amorphous, nanocrystalline alloy strip is at least one of punching cutting, die cutting, electric spark cutting, plasma cutting, laser cutting and water jet cutting.

[0019] Preferably, in the step S3, the heat treatment temperature is 250-580℃, the holding time is 1-5 hours, and after the holding time ends, the temperature of the stack body is reduced to below 200℃ along with the furnace body, and then is cooled to room temperature.

[0020] Preferably, the material of the stack jig is one of stainless steel, tool steel, titanium alloy and ceramic.

[0021] Preferably, in the step S6, the surface loss reduction treatment of the core blank is weak acid solution immersion, and the surface protection treatment of the core blank is uniform coating of self-drying insulating paint.

[0022] The above technical solution has the following advantages or beneficial effects:

[0023] 1) The preparation method in the application can cut the strip material in a batch cutting mode such as punching and die cutting, greatly improving the production efficiency, without the need for wire cutting process in the whole process, and the waste strip material cut off can also be remelted and utilized, greatly reducing the production cost, and making the production of amorphous and nanocrystalline cores more environmentally friendly and energy-saving;

[0024] 2) The preparation method in the application adopts a pressing mechanism and a screwing mechanism to press and fix the lamination body, which is accurate in positioning, high in automatic lamination production efficiency, realizes the standardization of production process parameters, and is beneficial to batch production. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 For the preferred embodiments of the application, the step flowchart of the method;

[0026] Figure 2 For the preferred embodiments of the application, the structure diagram of the lamination jig;

[0027] Figure 3 For the preferred embodiments of the application, the structure diagram of the automatic lamination device;

[0028] Figure 4 For the preferred embodiments of the application, the specific flowchart of step S5;

[0029] Figure 5 For the preferred embodiments of the application, the core loss curve diagram of the amorphous and nanocrystalline cores in Example 1, Example 2, Comparative Example 1 and Comparative Example 2.

[0030] BRIEF DESCRIPTION OF DRAWINGS: 1, lamination jig; 2, base; 3, handle; 4, outer positioning column; 5, middle positioning column; 6, center hole; 7, notch; 8, amorphous and nanocrystalline lamination body; 9, workbench; 10, pressing mechanism; 11, screwing mechanism; 12, pressing block; 13, pressing nut. DETAILED DESCRIPTION

[0031] The application will be described in detail below in combination with the drawings and specific embodiments. The application is not limited to this embodiment, and other embodiments can also belong to the scope of the application as long as they meet the main idea of the application.

[0032] In the preferred embodiment of the present application, in order to solve the above problems existing in the prior art, a preparation method of a nanocrystalline alloy stator core for a motor is provided. The amorphous and nanocrystalline alloy strip is cut into a plurality of amorphous and nanocrystalline alloy single pieces with the same shape according to the cross-sectional design of the core. An automatic laminating device is used to stack and laminate the cut amorphous and nanocrystalline alloy single pieces to obtain a laminated assembly of the amorphous and nanocrystalline lamination and the lamination jig. Then, the laminated assembly is subjected to heat treatment, paint dipping and curing treatment. The amorphous and nanocrystalline lamination after curing and shaping is disassembled from the lamination jig to obtain a core blank. The core blank is subjected to surface treatment to obtain a finished core.

[0033] In the preferred embodiment of the present application, as shown in Figure 1 The preparation method comprises the following steps:

[0034] Step S1, slicing: the amorphous and nanocrystalline alloy strip is cut according to the pre-set cross-sectional shape and size of the finished core to obtain a plurality of amorphous and nanocrystalline alloy single pieces with the same shape and size as the cross section of the finished core;

[0035] Step S2, laminating: the amorphous and nanocrystalline alloy single pieces are stacked on the lamination jig in sequence to form an amorphous and nanocrystalline lamination. Then, the amorphous and nanocrystalline lamination and the lamination jig are placed on a workbench in an automatic laminating device. The amorphous and nanocrystalline lamination is compacted and preliminarily shaped by the automatic laminating device to obtain a laminated assembly.

[0036] Step S3, heat treatment: the laminated assembly is placed in a heat treatment furnace for heat treatment.

[0037] Step S4, paint dipping treatment: the laminated assembly after heat treatment is placed in a vacuum pressure paint dipping equipment for paint dipping treatment.

[0038] Step S5, curing and shaping: the laminated assembly after paint dipping is baked and cured. Then, the amorphous and nanocrystalline lamination after curing and shaping is disassembled from the lamination jig to obtain a core blank.

[0039] Step S6, surface treatment: the redundant insulating paint on the surface of the core blank is removed. The core blank is subjected to surface loss reduction treatment and surface protection treatment to obtain a finished core.

[0040] Specifically, in the present embodiment, the amorphous and nanocrystalline alloy single pieces are fixed by the interlayer bonding method in the prior art. Considering the problem of unfirm bonding and interlayer cracking, the automatic laminating device is used to fix the amorphous and nanocrystalline lamination, so that the mechanical stability of the core is ensured, and the problem of core damage caused by interlayer cracking due to unfirm bonding and uneven stress is avoided.

[0041] Specifically, in the embodiment, a plurality of amorphous and nanocrystalline alloy single pieces of the same shape can be obtained by cutting once, and the whole preparation process of the core only needs to be heat treated once, greatly shortening the time of the preparation process, and the magnetic and mechanical properties of the prepared amorphous and nanocrystalline core are excellent.

[0042] Specifically, in the embodiment, the preparation method is suitable for preparing both amorphous and nanocrystalline cores. When an amorphous core is needed, a plurality of amorphous alloy single pieces of the same shape can be obtained by cutting the amorphous alloy strip, and then the amorphous core can be prepared through the subsequent steps of the preparation method. When a nanocrystalline core is needed, a plurality of nanocrystalline alloy single pieces of the same shape can be obtained by cutting the nanocrystalline alloy strip, and then the nanocrystalline core can be prepared through the subsequent steps of the preparation method.

[0043] Preferably, the temperature of heat treatment needs to be adjusted when the amorphous and nanocrystalline cores are prepared by the preparation method.

[0044] In the preferred embodiment of the present application, as shown in Figure 2 The base 2 of the lamination jig 1 is provided with at least one set of lamination positioning devices and at least one handle 3. Each set of lamination positioning devices includes at least one outer positioning column 4 and one middle positioning column 5.

[0045] In the preferred embodiment of the present application, a center hole 6 is formed on each amorphous and nanocrystalline alloy single piece, and a notch 7 is formed on the outer ring of each amorphous and nanocrystalline alloy single piece. In step S2, the notch 7 of each amorphous and nanocrystalline alloy single piece is clamped into the outer positioning column 4, and the center hole 6 of each amorphous and nanocrystalline alloy single piece is inserted into the middle positioning column 5, so as to form an amorphous and nanocrystalline lamination body 8.

[0046] Specifically, in the embodiment, the cross section of the outer positioning column 4 is wedge-shaped, and the vertex of the wedge shape faces the outer positioning column 4. The outer positioning column 4 is marked with a size to facilitate the measurement and calculation of the height of the amorphous and nanocrystalline lamination body 8 by the operator.

[0047] Preferably, the cross section of the notch 7 on the amorphous and nanocrystalline alloy single piece is adapted to the size of the cross section of the outer positioning column 4.

[0048] Preferably, the amorphous and nanocrystalline lamination body 8 is formed by stacking a plurality of layers of amorphous and nanocrystalline alloy single pieces on the lamination jig 1. Each amorphous and nanocrystalline alloy single piece has a notch 7, and the notch 7 is completely clamped with one side of the outer positioning column 4. The pressing block 12 is also provided with the same notch 7. The notch 7, the outer positioning column 4, and the middle positioning column 5 enable the amorphous and nanocrystalline alloy single pieces to be arranged in order. The amorphous and nanocrystalline alloy single pieces are pressed and immersed by the pressing block 12, and are tightly fixed by the automatic lamination device to obtain a lamination assembly.

[0049] Preferably, when the magnetic flux density is 1.0T and the frequency is 1000Hz, the core loss of the nanocrystalline core prepared by the preparation method is only 2.52W / kg, which is much lower than the core loss of the nanocrystalline core prepared by the traditional method.

[0050] In the preferred embodiment of the present application, as shown in Figure 3 The laminating device comprises a workbench 9, a lamination jig 1, a pressing mechanism 10, and a screwing mechanism 11. The lamination jig 1 is placed on the workbench 9, a pressing mechanism 10 is arranged above the lamination jig 1, and a screwing mechanism 11 is arranged above the pressing mechanism 10 (the remaining devices and connection modes are not shown in the figure). In step S2, a pressing block 12 and a pressing nut 13 are sequentially inserted into the center positioning column 5, then the pressing mechanism 10 is controlled to extrude the pressing block 12 for compaction treatment, and the screwing mechanism 11 is controlled to tighten the pressing nut 13 for preliminary shaping treatment, so as to obtain a laminated assembly.

[0051] In the preferred embodiment of the present application, as shown in Figure 4 Step S5 comprises:

[0052] In step S51, the laminated assembly after paint dipping treatment is baked at a temperature of 130-200℃ and is kept for 1-8 hours.

[0053] In step S52, the laminated assembly after baking treatment is cooled to room temperature, and then the laminated assembly is disassembled to obtain an iron core blank.

[0054] In the preferred embodiment of the present application, in step S1, the cutting mode of the amorphous and nanocrystalline alloy strip is at least one of punching cutting, die cutting, electric spark cutting, plasma cutting, laser cutting, and water jet cutting.

[0055] Specifically, in the present embodiment, considering that there are many common cutting modes, the cutting mode is not limited in the present embodiment, and the amorphous and nanocrystalline alloy strip can be cut by at least one of punching cutting, die cutting, electric spark cutting, plasma cutting, laser cutting, and water jet cutting.

[0056] In the preferred embodiment of the present application, in step S3, the heat treatment temperature is 250-580℃, the holding time is 1-5 hours, and after the holding time ends, the temperature of the lamination body is reduced to below 200℃ along with the furnace body, and then is cooled to room temperature.

[0057] Specifically, in the embodiment, the process of heat treatment is generally divided into heating, holding and cooling, the preparation method heats the laminated assembly to 250-580 DEG C in the heating stage, holds the heated laminated assembly for 1-5 hours in the holding stage, and then lowers the laminated assembly to below 200 DEG C after holding is completed, and then cools to normal temperature.

[0058] In the preferred embodiment of the present application, the material of the lamination jig 1 is one of stainless steel, tool steel, titanium alloy and ceramic.

[0059] Specifically, in the embodiment, the material of the lamination jig 1 is not limited, and stainless steel or tool steel or titanium alloy or ceramic can be used.

[0060] Preferably, in the embodiment, stainless steel is used as the material of the lamination jig 1.

[0061] In the preferred embodiment of the present application, the surface loss reduction treatment of the core blank in step S6 is weak acid solution immersion.

[0062] In the preferred embodiment of the present application, the surface protection treatment of the core blank in step S6 is uniform coating of self-drying insulating paint.

[0063] Embodiment one:

[0064] In the embodiment, Fe-Si-B-Nb-Cu iron-based nanocrystalline soft magnetic alloy strip with an average thickness of 20±2 μm is selected, and in order to test the performance, the embodiment and the comparative example are all prepared into a circular ring-shaped core, and the specific steps are as follows:

[0065] Step S1, slicing: according to the shape of the circular ring-shaped core product, the iron-based nanocrystalline soft magnetic alloy strip is transversely cut by punching and cutting to obtain a plurality of circular ring-shaped nanocrystalline alloy single pieces with a size of 50*40 mm;

[0066] Step S2, laminating: the nanocrystalline alloy single pieces are stacked on the lamination jig 1 in sequence to obtain a nanocrystalline lamination body, the pressing block 12 is pressed on the upper surface of the nanocrystalline lamination body, and then the automatic laminating device is used to compact and preliminarily shape the nanocrystalline lamination body to obtain a laminated assembly. Specifically, the height of the obtained nanocrystalline lamination body is 20 mm;

[0067] Step S3, heat treatment: the compacted and preliminarily shaped laminated assembly is heat treated under vacuum and at a heat treatment temperature of 550 DEG C or higher, and is held for 2 hours, and then the temperature of the nanocrystalline lamination body is lowered to below 200 DEG C with the furnace body and then cooled to normal temperature;

[0068] Step S4, varnish treatment: the laminated assembly after heat treatment is placed in a vacuum pressure varnish equipment for varnish treatment;

[0069] Step S5, curing and shaping: the laminated assembly after varnish treatment is baked and cured, and then the nanocrystalline laminated sheet is disassembled to obtain an iron core blank with a size of 50*40*20mm;

[0070] Step S6, surface treatment: the redundant insulating varnish on the surface of the iron core blank is removed, and the iron core blank is subjected to surface loss reduction treatment and surface protection treatment to obtain an iron core finished product.

[0071] The laminated nanocrystalline iron core prepared is tested by using an AC-DC superimposed soft magnetic test device MATS-2010SA, and it is found that the iron core loss of the laminated nanocrystalline iron core is only 2.52W / kg at a frequency of 1kHz and a magnetic flux density of 1.0T.

[0072] Comparative Example One:

[0073] In this comparative example, the same soft magnetic alloy strip as in Example One is selected, and Fe-Si-B-Nb-Cu iron-based nanocrystalline soft magnetic alloy strip with an average thickness of 20±2μm is selected. The specific steps are as follows:

[0074] Step S1, strip pressing and forming: the iron-based nanocrystalline soft magnetic alloy strip is wound into a magnetic ring with a size of 65*55*63mm or cut into a square sheet with a size of 60*60mm. The magnetic ring or sheet is placed on a steel plate with a fixing device, and then another steel plate is pressed on the magnetic ring or sheet, and the upper and lower steel plates are fixed by screws, so that the magnetic ring or sheet is pressed into a magnetic block with a height of 20mm;

[0075] Step S2, heat treatment: the magnetic block obtained in step S1 is placed in a vacuum heat treatment furnace for heat treatment at 550℃ and heat preservation for 2 hours. After the temperature of the magnetic block is reduced to 200℃ along with the furnace body, it is cooled to room temperature;

[0076] Step S3, varnish treatment and curing: the magnetic block obtained in step S2 is subjected to varnish treatment, and then subjected to curing treatment at 150℃. After heat preservation for 2 hours, it is air-cooled to room temperature;

[0077] Step S4, wire cutting: the magnetic block after curing in step S3 is wire cut according to the structure and size of the iron core finished product to obtain an iron core finished product with a size of 50*40*20mm.

[0078] The iron core prepared is tested by using an AC-DC superimposed soft magnetic test device MATS-2010SA, and it is found that the average iron core loss of the nanocrystalline iron core is only 4.48W / kg at a frequency of 1kHz and a magnetic flux density of 1.0T.

[0079] Example Two:

[0080] In this embodiment, a different amorphous alloy strip is selected, Fe-Si-B iron-based amorphous soft magnetic alloy strip with an average thickness of 20±2 μm is selected, the heat treatment temperature is 390℃, and the rest of the preparation method is the same as that of Example 1. The size of the prepared iron core is the same as that of Example 1. The loss test results of the iron core prepared by this method are shown in Table 1.

[0081] Comparative Example 2:

[0082] In this comparative example, the same amorphous alloy strip as in Example 2 is selected, Fe-Si-B iron-based amorphous soft magnetic alloy strip with an average thickness of 20±2 μm is selected, and the rest of the preparation method is the same as that of Comparative Example 1. The size of the prepared iron core is the same as that of Example 2. The loss test results of the iron core prepared by this method are shown in Table 1.

[0083] Table 1 Iron core loss of the iron cores prepared in Example 1, Example 2, Comparative Example 1 and Comparative Example 2 under different frequencies f and magnetic flux densities Bm

[0084]

[0085] Under the test environment of a frequency f of 1 kHz and a magnetic flux density Bm of 1 T, the iron core loss of the nanocrystalline iron core prepared in Example 1 is only 2.52 W / kg, the iron core loss of the amorphous iron core prepared in Example 2 is 4.832 W / kg, the iron core loss of the nanocrystalline iron core prepared in Comparative Example 1 is 4.48 W / kg, and the iron core loss of the amorphous iron core prepared in Comparative Example 2 is 6.99 W / kg. It can be seen that under the same test environment, the iron core loss of the nanocrystalline iron core prepared by the method of the present application is lower than that of the nanocrystalline iron core prepared by the traditional method.

[0086] Under the condition that the magnetic flux density Bm is constant, the frequency f is gradually increased, and it can be found that the difference in iron core loss between the amorphous iron core prepared by the traditional method and the amorphous iron core prepared by the method of the present application, and between the nanocrystalline iron core prepared by the traditional method and the nanocrystalline iron core prepared by the method of the present application, is getting larger and larger. However, the amorphous iron core and the nanocrystalline iron core prepared by the method of the present application still have lower iron core loss and much better performance than the iron cores prepared by other methods.

[0087] In summary, as shown in Table 1, the amorphous and nanocrystalline iron cores prepared by the method of the present application have excellent soft magnetic properties, and the iron core loss is lower than that of the amorphous and nanocrystalline iron cores prepared by the traditional method. Therefore, it is proved that the amorphous and nanocrystalline iron cores prepared by using the amorphous and nanocrystalline alloy strip and the preparation method of the present application have excellent high magnetic permeability and low iron core loss, and by Figure 5The iron core loss curve in the figure can find that, under the premise of constant magnetic flux density, the reduction effect of the amorphous and nanocrystalline iron core prepared by the preparation method of the application is more obvious with the increase of the frequency in the test environment.

[0088] The above merely describes preferred embodiments of the present application, and is not intended to limit the embodiments and protection scope of the present application. Those skilled in the art should realize that any equivalent replacement and obvious changes made according to the present application and drawings should be included in the protection scope of the present application.

Claims

1. A method for manufacturing a laminated amorphous, nanocrystalline core, characterized in that, The amorphous and nanocrystalline alloy strip is cut into a plurality of amorphous and nanocrystalline alloy single pieces with the same shape according to the cross-sectional design of the core, and the amorphous and nanocrystalline alloy single pieces are stacked and pressed by an automatic stacking and pressing device to obtain a stacking and pressing assembly of the amorphous and nanocrystalline stacking piece and the stacking jig, then the stacking and pressing assembly is subjected to heat treatment, paint dipping and curing treatment, the amorphous and nanocrystalline stacking piece after curing and shaping is disassembled from the stacking jig to obtain a core blank, and the core blank is subjected to surface treatment to obtain a core finished product; The process of pressing the stacking and pressing assembly by the automatic stacking and pressing device includes: stacking the amorphous and nanocrystalline alloy single pieces on the stacking jig to form the amorphous and nanocrystalline stacking piece, then placing the amorphous and nanocrystalline stacking piece and the stacking jig on a workbench in the automatic stacking and pressing device, and compacting and preliminarily shaping the amorphous and nanocrystalline stacking piece by the automatic stacking and pressing device to obtain the stacking and pressing assembly.

2. The production method according to claim 1, characterized by, The preparation method comprises the following steps: Step S1, slicing: cutting the amorphous and nanocrystalline alloy strip according to the cross-sectional shape and size of the core finished product to obtain a plurality of amorphous and nanocrystalline alloy single pieces with the same shape and size as the cross section of the core finished product; Step S2, stacking and pressing: stacking the amorphous and nanocrystalline alloy single pieces on the stacking jig to form the amorphous and nanocrystalline stacking piece, then placing the amorphous and nanocrystalline stacking piece and the stacking jig on a workbench in the automatic stacking and pressing device, and compacting and preliminarily shaping the amorphous and nanocrystalline stacking piece by the automatic stacking and pressing device to obtain the stacking and pressing assembly; Step S3, heat treatment: placing the stacking and pressing assembly in a heat treatment furnace for heat treatment; Step S4, paint dipping treatment: placing the stacking and pressing assembly after heat treatment in a vacuum pressure paint dipping device for paint dipping treatment; Step S5, curing and shaping: baking and curing the stacking and pressing assembly after paint dipping, then disassembling the amorphous and nanocrystalline stacking piece after curing and shaping from the stacking jig to obtain the core blank; Step S6, surface treatment: removing the redundant insulating paint on the surface of the core blank, and performing surface loss reduction treatment and surface protection treatment on the core blank to obtain the core finished product.

3. The production method according to claim 2, characterized by, The base of the stacking jig is provided with at least one set of stacking positioning devices and at least one handle.

4. The production method according to claim 3, characterized by, Each of the amorphous and nanocrystalline alloy single pieces is provided with a center hole, and each of the outer rings of the amorphous and nanocrystalline alloy single pieces is provided with at least one notch, and in the step S2, the notches of the amorphous and nanocrystalline alloy single pieces are respectively clamped into the outer positioning columns, and the center holes of the amorphous and nanocrystalline alloy single pieces are respectively penetrated into the middle positioning columns to form the amorphous and nanocrystalline stacking piece.

5. The preparation method according to claim 3, characterized in that, The laminating device comprises a workbench, a lamination jig, a pressing mechanism and a screwing mechanism, the lamination jig is placed on the workbench, a pressing mechanism is arranged above the lamination jig, and a screwing mechanism is arranged above the pressing mechanism; in step S2, a pressing block and a pressing nut are sequentially threaded into the positioning column, then the pressing mechanism is controlled to extrude the pressing block for compaction treatment, and the screwing mechanism is controlled to screw the pressing nut for preliminary shaping treatment, so as to obtain the laminated assembly.

6. The preparation method according to claim 2, characterized in that, The step S5 comprises: Step S51, baking the laminated assembly after paint immersion treatment at a temperature of 130-200℃, and keeping warm for 1-8 hours; Step S52, cooling the laminated assembly after baking treatment to room temperature, and then disassembling the laminated assembly to obtain the core blank.

7. The preparation method according to claim 2, characterized in that, In step S1, the cutting mode of the amorphous and nanocrystalline alloy strip is at least one of punching cutting, die cutting, electric spark cutting, plasma cutting, laser cutting and water jet cutting.

8. The preparation method according to claim 2, characterized in that, In step S3, the heat treatment temperature is 250-580℃, the holding time is 1-5 hours, and after the holding time ends, the temperature of the lamination body is reduced to below 200℃ along with the furnace body, and then cooled to room temperature.

9. The method of claim 1, wherein, The material of the lamination jig is one of stainless steel, tool steel, titanium alloy and ceramic.

10. The method of claim 2, wherein, In step S6, the surface loss reduction treatment of the core blank is weak acid solution immersion; the surface protection treatment of the core blank is uniform coating of self-drying insulation paint.

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