Amorphous nanocrystalline magnetic core heat treatment device with constant magnetic permeability and magnetic core preparation method

Abstract

The invention relates to the field of heat treatment, and in particular to a heat treatment device for an amorphous nanocrystalline magnetic core with constant magnetic permeability and a method for preparing the magnetic core, comprising a control system and original strip rollers respectively connected to the control system; a constant tension mechanism, the constant tension mechanism comprising a first electromagnetic roller mechanism, a force measuring roller, a first transition roller, a second transition roller and a second electromagnetic roller mechanism which are arranged in sequence, and a tension sensor is arranged on the force measuring roller; a heat treatment mechanism, the heat treatment mechanism is provided with at least one group of laser heating equipment with adjustable laser intensity; a magnetic core winding mechanism, which is arranged at one side of the discharge end of the second electromagnetic roller mechanism, and the strip is wound and cut according to the winding signal output by the control system. The invention adopts a constant tension heat treatment-winding-heat treatment method, omitting the conventional process of winding after constant tension heat treatment, and does not require manual roll changing and installation, with a high degree of automation, thereby improving production efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of heat treatment, and in particular to a heat treatment device for an amorphous nanocrystalline magnetic core with a constant magnetic permeability and a method for preparing the magnetic core. Background Art

[0002] With the development of the power system, the increase in power electronic equipment, a large number of rectifiers, frequency converters and high-frequency switching power supply equipment have been more widely used, resulting in increasingly serious electromagnetic pollution in the line, which will gradually increase the DC component in the line, causing abnormal magnetic circuits in power electronic devices, thereby causing interference noise and mechanical vibration. In order to ensure that components such as transformers and inductors can still work normally in an environment with a large DC component, it is necessary to ensure that the magnetic cores in these components are not saturated when AC and DC are superimposed. For this reason, as a current transformer that resists DC components, the core material should have a high saturation magnetic induction intensity, and should also have characteristics such as high linear magnetic permeability and constant magnetic permeability.

[0003] At present, in order to obtain the above-mentioned magnetic core with the ability to resist DC bias, the amorphous nanocrystalline soft magnetic alloy strip is usually heat treated under constant tension to first obtain an amorphous nanocrystalline strip with high linearity and constant magnetic permeability, and then the strip is wound into magnetic cores of various specifications. Figure 1 The figure shows a conventional constant tension heat treatment device for amorphous nanocrystalline strips in the prior art. The main method is to place the original amorphous nanocrystalline strip on the original strip roller 71 of the existing heat treatment device, and pass the strip through the support roller 73, transition roller 72, force measuring roller 74 and heat treatment furnace 75 of the existing heat treatment device in sequence, and finally directly wind it up by the winding roller 76. However, the existing constant tension heat treatment equipment has the following shortcomings:

[0004] (1) The existing constant tension heat treatment process has poor tension control stability and cannot achieve constant tension control throughout the heat treatment process;

[0005] (2) Existing constant tension heat treatment equipment can only perform tension heat treatment on the entire roll of original strip. When preparing the magnetic core later, the heat-treated strip needs to be rewound into a magnetic core of specific specifications. However, the toughness of amorphous nanocrystalline strips after heat treatment is extremely poor and they are very easy to break. The subsequent magnetic core preparation process relies heavily on manpower, making it difficult to carry out automated production. The production efficiency is low and the production cost is greatly increased, which is not conducive to the mass application of constant magnetic permeability amorphous nanocrystalline magnetic cores and their components.

[0006] (3) After the constant tension heat-treated strip is wound into a magnetic core, a large internal stress is generated in the core strip, resulting in a large deviation in the magnetic permeability and other properties of the finished magnetic core.

[0007] Therefore, it is urgent to develop a constant magnetic permeability amorphous nanocrystalline magnetic core heat treatment device and a magnetic core preparation method of the supporting device. Summary of the invention

[0008] The purpose of the present invention is to provide a heat treatment device for amorphous nanocrystalline magnetic cores with constant magnetic permeability to solve the above technical problems;

[0009] The present invention also aims to provide a method for preparing an amorphous nanocrystalline magnetic core with constant magnetic permeability to solve the above technical problems.

[0010] The technical problem solved by the present invention can be achieved by adopting the following technical solutions:

[0011] A constant magnetic permeability amorphous nanocrystalline magnetic core heat treatment device comprises a control system and components respectively connected to the control system.

[0012] Raw strip rolls;

[0013] A constant tension mechanism, the constant tension mechanism comprising a first electromagnetic roller mechanism, a force measuring roller, a first transition roller, a second transition roller and a second electromagnetic roller mechanism arranged in sequence, the force measuring roller being provided with a tension sensor;

[0014] A heat treatment mechanism, wherein the heat treatment mechanism is provided with at least one set of laser heating equipment capable of adjusting laser intensity;

[0015] Preferably, the constant tension mechanism is arranged on the discharge end side of the original strip roller, and the control system adjusts the magnetic attraction force and rotation speed of the first electromagnetic roller mechanism and the second electromagnetic roller mechanism based on the received tension sensor signal and the set constant tension value output tension control signal.

[0016] Preferably, the first electromagnetic roller mechanism and the second electromagnetic roller mechanism each include at least one group of electromagnetic rollers having the same structure, and each group of electromagnetic rollers is respectively arranged on the upper surface and the lower surface of the strip.

[0017] Preferably, the electromagnetic roller is provided with a plurality of groups of electromagnets, coils are wound around the electromagnets, and the rest of the electromagnetic roller is made of non-magnetic material.

[0018] Preferably, the electromagnet on the electromagnetic roller is electrically connected to the control system, and the electromagnetic attraction of the electromagnetic roller to the strip is regulated by the control system.

[0019] Preferably, the heat treatment mechanism is disposed between the first transition roller and the second transition roller, and performs heat treatment on the strip based on a heat treatment signal output by the control system.

[0020] Preferably, the original strip roller, the constant tension mechanism, and the magnetic core winding mechanism are all connected to a driving device, and a controlled end of the driving device is connected to the control system.

[0021] Preferably, the laser heating device comprises a first laser heating device and a second laser heating device, which are respectively arranged on the upper and lower sides of the strip and can independently set different laser intensities.

[0022] Preferably, the laser heating device is connected to a temperature measuring element, and the temperature measuring element is connected to a display for displaying the temperature in real time.

[0023] Preferably, the magnetic core winding mechanism includes, arranged in sequence,

[0024] A traction roller assembly, comprising at least one pair of first traction rollers and second traction rollers respectively arranged on upper and lower sides of the strip;

[0025] A limit pressing block assembly, comprising a first limit pressing block and a second limit pressing block respectively arranged on the upper and lower sides of the strip;

[0026] A cutter assembly, comprising a first cutter and a second cutter respectively arranged on the upper and lower sides of the strip;

[0027] A first guide plate, horizontally arranged between the limiting pressure block assembly and the cutter assembly;

[0028] The winding roller comprises a winding core sleeved on a winding shaft, and a resistance welding mechanism arranged corresponding to the winding core, wherein the resistance welding mechanism comprises an external welding mechanism and an internal welding mechanism;

[0029] The second guide plate is horizontally arranged between the cutter assembly and the winding roller.

[0030] Preferably, a measuring sensor is provided on the side of the winding roller, and the measuring sensor includes an outer diameter measuring sensor and a strip turns sensor, which are respectively used to measure the outer diameter and the turns of the magnetic core of the strip winding in real time.

[0031] The method for preparing an amorphous nanocrystalline magnetic core with constant magnetic permeability is applied to the amorphous nanocrystalline magnetic core heat treatment device, and is characterized by comprising:

[0032] Step S1, unwinding and position adjustment: placing the strip on the original strip roller, and passing the strip through the constant tension mechanism, the heat treatment mechanism, the magnetic core winding mechanism in sequence, and conveying it to the winding roller;

[0033] Step S2, parameter setting: setting parameters including at least heat treatment temperature, strip internal tension value, strip transmission speed, strip width, strip thickness, magnetic core inner diameter, and magnetic core outer diameter to the control system;

[0034] Step S3, constant tension heat treatment: start the switches of all mechanisms on the control system, the device completes the heat treatment of the strip under constant tension control, and the magnetic core winding mechanism winds the strip into a magnetic core of a preset size;

[0035] Step S4, stress relief heat treatment: the magnetic core obtained after constant tension heat treatment and winding is placed in an external heat treatment furnace for stress relief heat treatment, and the finished magnetic core is obtained after cooling to room temperature.

[0036] Preferably, in step S4, the holding temperature of the stress relief heat treatment is 200° C.-400° C., the holding time is 1 h-5 h, and the heat treatment atmosphere is vacuum, inert gas or hydrogen.

[0037] Beneficial effects of the present invention:

[0038] (1) The present invention can control the tension stability of the strip during the entire heat treatment process by setting a series of equipment such as an electromagnetic roller mechanism, a force measuring roller, and a transition roller, so that the magnetic saturation ability of the strip is good. In addition, the internal and external tensions of the magnetic core are consistent when the magnetic core is wound, so that the performance consistency of the magnetic core is good;

[0039] (2) The constant tension heat treatment device of the present invention reasonably arranges the heat treatment mechanism and the magnetic core winding mechanism, which can continuously heat treat the original strip and directly wind the heat-treated strip into a magnetic core of a specific specification, thereby solving the problem of low yield of magnetic cores obtained by secondary winding due to poor toughness of the strip after conventional constant tension heat treatment. The whole process does not rely on manpower and has a high degree of automation, which improves production efficiency and greatly reduces production costs, and is conducive to the mass application of constant magnetic permeability amorphous nanocrystalline magnetic cores and their components.

[0040] (3) The present invention performs stress relief heat treatment on the strip after constant tension heat treatment after winding it into a magnetic core, which can effectively eliminate the residual stress inside the magnetic core and is beneficial to the stability of the magnetic permeability performance of the magnetic core. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 It is a structural schematic diagram of a strip heat treatment device in the prior art;

[0042] Figure 2 Schematic diagram of the structure of a magnetic core heat treatment device in an embodiment of the present invention;

[0043] Figure 3 This is a connection diagram of a control system in an embodiment of the present invention;

[0044] Figure 4 It is a schematic diagram of the structure of the electromagnetic roller in an embodiment of the present invention;

[0045] Figure 5Schematic diagram of the steps of a method for preparing a magnetic core according to an embodiment of the present invention.

[0046] In the attached drawings: 1. control system; 2. original strip roller; 3. constant tension mechanism; 31. first electromagnetic roller mechanism; 311. electromagnet; 312. coil; 313. remaining parts of electromagnetic roller; 32. force measuring roller; 321. tension sensor; 33. first transition roller; 34. second transition roller; 35. second electromagnetic roller mechanism; 36. third transition roller; 4. heat treatment mechanism; 41. laser heating device; 42. display; 5. magnetic core winding mechanism; 51. traction roller assembly; 52. limit pressure block assembly; 53. cutter assembly Parts; 54, winding roller; 541, measuring sensor; 542, winding shaft; 543, winding core; 544, resistance welding mechanism; 545, external welding mechanism; 546, internal welding mechanism; 55, first guide plate; 56, second guide plate; 6, driving device; 71, original strip roller of existing heat treatment device; 72, transition roller of existing heat treatment device; 73, supporting roller of existing heat treatment device; 74, force measuring roller of existing heat treatment device; 75, heat treatment furnace of existing heat treatment device; 76, winding roller of existing heat treatment device. DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0049] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but they are not intended to limit the present invention.

[0050] Amorphous nanocrystalline magnetic core heat treatment device with constant magnetic permeability, such as Figure 2 , Figure 3 As shown, it includes a control system 1 and includes, respectively connected to the control system,

[0051] Original strip roll 2;

[0052] The constant tension mechanism 3 includes a first electromagnetic roller mechanism 31, a force measuring roller 32, a first transition roller 33, a second transition roller 34 and a second electromagnetic roller mechanism 35 which are arranged in sequence. The force measuring roller 32 is provided with a tension sensor 321. Specifically, the tension sensor 321 is used to monitor and transmit the tension of the strip to the control system 1.

[0053] A heat treatment mechanism 4, wherein the heat treatment mechanism 4 is provided with at least one set of laser heating equipment 41 capable of adjusting laser intensity;

[0054] The magnetic core winding mechanism 5 is arranged at the discharge end side of the second electromagnetic roller mechanism 35, and is used to wind and cut the strip according to the winding signal output by the control system 1 to prepare the magnetic core.

[0055] Specifically, the present invention can ensure that the strip maintains a constant tension during the entire heat treatment process by adding magnetic pressure rollers, tension sensors, control systems, magnetic core winding mechanisms and other equipment, ensure that the internal and external tensions are consistent when the magnetic core is wound, improve the anti-magnetic saturation ability of the nanocrystalline soft magnetic alloy, and the prepared magnetic core has good performance consistency.

[0056] In a preferred embodiment, the constant tension mechanism 3 is arranged on the discharge end side of the original strip roller 2, and the control system 1 adjusts the magnetic attraction force and rotation speed of the first electromagnetic roller mechanism 31 and the second electromagnetic roller mechanism 35 based on the received tension sensor signal and the set constant tension value output tension control signal to control the stability of the strip tension.

[0057] Specifically, the constant tension mechanism 3 in the present invention is composed of at least two groups of electromagnetic rollers, at least two groups of transition rollers and a force measuring roller 32. The electromagnetic rollers are placed at the front and rear ends of the heat treatment mechanism 4. The force measuring roller 32 is equipped with a tension sensor 321 and is connected to the control system 1. The control system 1 collects the tension sensor signal on the tension sensor 321 in real time, and the system outputs a tension control signal to adjust the magnetic attraction value between the electromagnetic roller and the strip in real time to ensure constant tension heat treatment.

[0058] In a preferred embodiment, the first electromagnetic roller mechanism 31 and the second electromagnetic roller mechanism 35 each include at least one group of electromagnetic rollers with the same structure, and each group of electromagnetic rollers is respectively disposed on the upper surface and the lower surface of the strip.

[0059] In a preferred embodiment, Figure 4 As shown, the electromagnetic roller is provided with a plurality of groups of electromagnets 311, and coils 312 are wound around the electromagnets 311. The rest 313 of the electromagnetic roller is made of non-magnetic material.

[0060] In a preferred embodiment, the electromagnet 311 on the electromagnetic roller is electrically connected to the control system 1, and the control system 1 regulates the electromagnetic attraction of the electromagnetic roller to the amorphous nanocrystalline strip.

[0061] For details, please refer to Figure 2 As shown, a third transition roller 36 is further provided between the second electromagnetic roller mechanism 35 and the traction roller assembly 51 .

[0062] In a preferred embodiment, the heat treatment mechanism 4 is disposed between the first transition roller 33 and the second transition roller 34 , and performs heat treatment on the strip based on the heat treatment signal output by the control system 1 .

[0063] In a preferred embodiment, the original strip roller 2, the constant tension mechanism 3, and the magnetic core winding mechanism 5 are all connected to the driving device 6, and the controlled end of the driving device 6 is connected to the control system 1; specifically, in this embodiment, the driving device 6 adopts a servo motor.

[0064] More specifically, the original strip roller 2 , the constant tension mechanism 3 , and the magnetic core winding mechanism 5 are all driven by a driving device 6 , and the driving device 6 is controlled by a control system 1 .

[0065] In a preferred embodiment, at least one group of laser heating equipment 41 with adjustable laser intensity is provided in the heat treatment mechanism 4, and each group of laser heating equipment 41 includes a first laser heating equipment and a second laser heating equipment respectively arranged on the upper and lower sides of the strip and capable of independently setting different laser intensities.

[0066] Preferably, each laser heating device 41 in this embodiment can be individually set with different laser intensities to meet the requirements of multiple temperature zones, and the selected laser heating has an extremely high power density, can achieve rapid heating, and does not require a long heating tube, saving equipment space, reducing production costs, and thereby improving production efficiency.

[0067] In a preferred embodiment, the laser heating device 41 is connected to a temperature measuring element, and the temperature measuring element is connected to a display 42 for displaying the temperature in real time.

[0068] In a preferred embodiment, the magnetic core winding mechanism 5 includes:

[0069] The traction roller assembly 51 includes a plurality of first traction rollers and a second traction roller respectively arranged on the upper and lower sides of the strip;

[0070] The limiting pressing block assembly 52 includes a first limiting pressing block and a second limiting pressing block respectively arranged on the upper and lower sides of the strip;

[0071] The cutter assembly 53 includes a first cutter and a second cutter respectively disposed on the upper and lower sides of the strip;

[0072] A first guide plate 55 is horizontally disposed between the limiting pressure block assembly 52 and the cutter assembly 53;

[0073] The winding roller 54 includes a winding core 543 sleeved on a winding shaft 542, and a resistance welding mechanism 544 arranged corresponding to the winding core 543, wherein the resistance welding mechanism 544 includes an external welding mechanism 545 and an internal welding mechanism 546;

[0074] The second guide plate 56 is horizontally disposed between the cutter assembly 53 and the winding roller 54 .

[0075] In a preferred embodiment, a measuring sensor 541 is provided on the side of the winding roller 54. The measuring sensor 541 includes an outer diameter measuring sensor and a strip winding number sensor, which are respectively used to measure the outer diameter and number of windings of the magnetic core of the strip winding in real time.

[0076] The method for preparing an amorphous nanocrystalline magnetic core with constant magnetic permeability is applied to an amorphous nanocrystalline magnetic core heat treatment device in any one of the embodiments, such as Figure 5 As shown, including,

[0077] Step S1, unwinding and position adjustment: placing the strip on the original strip roller 2, and passing the strip through the constant tension mechanism 3, the heat treatment mechanism 4, the magnetic core winding mechanism 5 in sequence, and conveying it to the winding roller 54;

[0078] Step S2, parameter setting: setting parameters including at least heat treatment temperature, strip internal tension value, strip transmission speed, strip width, strip thickness, magnetic core inner diameter, and magnetic core outer diameter to the control system 1;

[0079] Specifically, based on the monitoring result of the tension sensor 321 on the force measuring roller 32, the tension sensor signal is transmitted to the control system 1, and the control system 1 controls the tension stability of the strip by adjusting the magnetic attraction force and rotation speed of the first electromagnetic roller mechanism 32 and the second electromagnetic roller mechanism 35;

[0080] Step S3, constant tension heat treatment: start the switches of all mechanisms on the control system 1, the device completes the heat treatment of the strip under constant tension control, and the magnetic core winding mechanism 5 winds the strip into a magnetic core of a preset size;

[0081] Specifically, the switches of the heat treatment mechanism 4, the driving device 6 and the magnetic core winding mechanism 5 on the control system 1 are started. After the strip passes through the heat treatment mechanism 4, the heat-treated strip is obtained. The electromagnetic roller controls the tension of the strip to be constant based on the tension control signal. The traction roller assembly 51 transmits the first guide plate 55 and the second guide plate 56 of the strip to the winding roller 54. The winding roller 54 grabs the heat-treated strip and starts to wind it. The measuring sensor 541 measures the outer diameter and the number of turns of the magnetic core wound on the strip. When the wound strip reaches the preset magnetic core size, the winding is stopped and the strip is cut by the cutter assembly 53 to obtain the wound magnetic core.

[0082] Specifically, the control system 1 obtains the size of the magnetic core on the winding machine through the data fed back by the measuring sensor 541 in the magnetic core winding mechanism 5. After the magnetic core is wound into place, it is automatically cut by the cutter assembly 53, all the pressure rollers stop, and the limit pressure block assembly 52 presses the heat-treated strip to keep the strip continuously tense.

[0083] Specifically, if there is unheated strip that has passed through the heat treatment mechanism 4, the unheat treated strip is transported to the core winding mechanism 5 by the traction roller assembly 51, and the unheat treated strip is cut off by the cutter assembly 53, so that only the heat treated strip remains to be wound by the winding roller 54.

[0084] Step S4, stress relief treatment: the magnetic core obtained after constant tension heat treatment and winding is placed in an external heat treatment furnace for stress relief heat treatment, and the finished magnetic core is obtained after cooling to room temperature.

[0085] In a preferred embodiment, the strip treatment in the present invention is applicable to nanocrystalline alloy strips and amorphous alloy strips. Specifically,

[0086] The heat treatment temperature of nanocrystalline alloy strip is 380-600℃;

[0087] The heat treatment temperature of amorphous alloy strip is 320-400℃;

[0088] The core stress relief heat treatment temperature is below 400℃;

[0089] The belt conveying speed is 10m / min-40m / min, preferably, the belt conveying speed is 20m / min-30m / min.

[0090] Specific embodiment 1,

[0091] Step S1, unloading and position adjustment: placing the Fe-Si-B-Ni-Cu nanocrystalline alloy strip on the original strip roller 2, and transferring the strip to the winding roller 54 through the constant tension mechanism 3, the heat treatment mechanism 4 and the magnetic core winding mechanism 5;

[0092] Step S2, parameter setting: set the heat treatment temperature to 500°C, the strip internal tension value to 9N, the strip transmission speed to 20m / min, the strip width to 5mm, the strip thickness to 20μm, the magnetic core inner diameter to 13mm, and the magnetic core outer diameter to 18mm in the control system 1;

[0093] Step S3, constant tension heat treatment: set the magnetic attraction force and the rotation speed of the front and rear electromagnetic rollers to set the tension in the strip. The tension is measured by the force measuring roller 32 and the tension sensor 321 and fed back to the control system 1, and the tension is adjusted by the control system 1; start the switches of the heat treatment mechanism 4, the drive device 6 and the magnetic core winding mechanism 5 on the control system 1. After the strip passes through the heat treatment mechanism 4, a heat-treated strip is obtained. The electromagnetic roller controls the tension of the strip to be constant based on the tension control signal; the traction roller assembly 51 conducts the strip to the winding roller 54 through the first guide plate 55 and the second guide plate 56. The winding roller 54 grabs the heat-treated strip and starts to wind it. The measuring sensor 541 measures the outer diameter and number of turns of the magnetic core wound by the strip. When the wound strip reaches the preset magnetic core size, the winding is stopped and cut by the cutter assembly 53. Then, the outer welding mechanism 545 and the inner welding mechanism 546 in the resistance welding mechanism 544 on the winding roller 54 are welded respectively to obtain the wound magnetic core.

[0094] Step S4, stress relief heat treatment: the magnetic core obtained after constant tension heat treatment and winding is placed in a vacuum heat treatment furnace at 300°C for stress relief heat treatment, with a heat preservation time of 2 hours, and the finished magnetic core is obtained after cooling to room temperature.

[0095] In a preferred embodiment, the present invention also provides a method for performing performance testing on the magnetic core after heat treatment in the above-mentioned embodiment 1, and the testing method is: winding a single turn of enameled copper wire on the magnetic core, using an impedance analyzer to test its inductance under the conditions of 1kHz, 10kHz, 100kHz, and 200kHz, and calculating that the magnetic permeability μ in the above frequency bands is 1190, 1170, 1100, and 1085 respectively.

[0096] Comparative Example 1,

[0097] This comparative example 1 uses an existing constant tension magnetic core heat treatment device, such as Figure 1 As shown, the same nanocrystalline alloy strip as in Example 1 is selected.

[0098] Step S1, unloading and position adjustment: placing the Fe-Si-B-Ni-Cu nanocrystalline alloy strip on the original strip roller 71 of the existing heat treatment device, and passing the strip through the transition roller 72 of the existing heat treatment device, the support roller 73 of the existing heat treatment device, the force measuring roller 74 of the existing heat treatment device and the heat treatment furnace 75 of the existing heat treatment device, and then being transferred from the support roller 73 of the existing heat treatment device to the existing winding roller 76;

[0099] Step S2, parameter setting: setting the control system of the existing heat treatment device to a heat treatment temperature of 500°C, a strip internal tension value of 9N, a strip transmission speed of 20m / min, a strip width of 5mm, and a strip thickness of 20μm;

[0100] Step S3, constant tension heat treatment: the temperature in the existing heat treatment furnace 75 is set to 500° C., the heat treatment device is started, the existing control system controls the tension of the strip and feeds back to the existing control system, and the tension is adjusted by the existing control system, and the heat-treated strip is wound up by the winding roller 76 of the existing heat treatment device;

[0101] Step S4, magnetic core winding: placing the heat-treated strip on an external magnetic core winding machine and winding it into a magnetic core with a size of 18*13*5mm;

[0102] The performance of the magnetic core after heat treatment in the comparative example 1 was tested by using the same testing method as that in the embodiment 1. The obtained performance parameters are shown in Table 1.

[0103] Specific embodiment 2,

[0104] Step S1, unloading and position adjustment: placing the Fe-Si-B amorphous alloy strip on the original strip roller 2, and transferring the strip to the winding roller 54 through the constant tension mechanism 3, the heat treatment mechanism 4 and the magnetic core winding mechanism 5;

[0105] Step S2, parameter setting: set the control system 1 to a heat treatment temperature of 350°C, a strip internal tension value of 4N, a strip transmission speed of 20m / min, a strip width of 5mm, a strip thickness of 20μm, a magnetic core inner diameter of 13mm, and a magnetic core outer diameter of 18mm;

[0106] Step S3, constant tension heat treatment: set the magnetic attraction force and the rotation speed of the front and rear electromagnetic rollers to set the tension in the strip. The tension is measured by the force measuring roller 32 and the tension sensor 321 and fed back to the control system 1, and the tension is adjusted by the control system 1; start the switches of the heat treatment mechanism 4, the drive device 6 and the magnetic core winding mechanism 5 on the control system 1. After the strip passes through the heat treatment mechanism 4, a heat-treated strip is obtained. The electromagnetic roller controls the tension of the strip to be constant based on the tension control signal; the traction roller assembly 51 conducts the strip to the winding roller 54 through the first guide plate 55 and the second guide plate 56. The winding roller 54 grabs the heat-treated strip and starts to wind it. The measuring sensor 541 measures the outer diameter and number of turns of the magnetic core wound by the strip. When the wound strip reaches the preset magnetic core size, the winding is stopped and cut by the cutter assembly 53. Then, the outer welding mechanism 545 and the inner welding mechanism 546 in the resistance welding mechanism 544 on the winding roller 54 are welded respectively to obtain the wound magnetic core.

[0107] Step S4, stress relief heat treatment: the magnetic core obtained after constant tension heat treatment and winding is placed in a vacuum heat treatment furnace at 400°C for stress relief heat treatment, with a heat preservation time of 2 hours, and the finished magnetic core is obtained after cooling to room temperature.

[0108] The performance of the magnetic core after heat treatment in the above embodiment 2 was tested. The testing method was as follows: a single turn of enameled copper wire was wound on the magnetic core, and its inductance at 1kHz, 10kHz, 100kHz, and 200kHz was tested using an impedance analyzer. The magnetic permeability μ in the above frequency bands was calculated to be 1080, 1050, 1010, and 1005, respectively.

[0109] Comparative Example 2,

[0110] The same amorphous alloy strip as in Example 2, the same heat treatment temperature as in Example 2, the same heat treatment device and preparation method as in Comparative Example 1 were selected, and the core was wound into 18*13*5mm to complete the heat treatment of the entire core.

[0111] The performance of the magnetic core after heat treatment in the above comparative example 2 was tested by using the same testing method as that of embodiment 2. The obtained performance parameters are shown in Table 1.

[0112] Table 1: Performance parameters of the magnetic cores after heat treatment of Examples 1-2 and Comparative Examples 1-2

[0113]

[0114] It can be seen from Table 1 that the heat treatment device and preparation method selected in the present invention make the prepared magnetic core have low attenuation of magnetic permeability, strong anti-saturation ability and good consistency of magnetic core performance.

[0115] In summary:

[0116] The present invention is provided with a series of equipment such as an electromagnetic roller mechanism, a force measuring roller, and a transition roller, which can control the tension stability of the strip during the entire heat treatment process, so that the magnetic saturation ability of the strip is good. In addition, the internal and external tensions of the magnetic core are consistent when the magnetic core is wound, so that the performance consistency of the magnetic core is good.

[0117] The present invention adopts a constant tension heat treatment device to reasonably set up a heat treatment mechanism and a magnetic core winding mechanism, which can continuously perform heat treatment on the original strip and directly wind the heat-treated strip into a magnetic core of a specific specification, thereby solving the problem of low yield of magnetic cores obtained by secondary winding due to poor toughness of the strip after conventional constant tension heat treatment. The whole process does not rely on manpower, has a high degree of automation, improves production efficiency, and greatly reduces production costs, which is conducive to the batch application of constant magnetic permeability amorphous nanocrystalline magnetic cores and components thereof. After the strip after constant tension heat treatment is wound into a magnetic core, a stress relief heat treatment is performed, which can effectively eliminate the residual stress inside the magnetic core, and is conducive to the stability of the magnetic permeability performance of the magnetic core.

[0118] The above description is only a preferred embodiment of the present invention, and does not limit the implementation mode and protection scope of the present invention. For those skilled in the art, it should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. A heat treatment device for amorphous nanocrystalline magnetic cores with constant magnetic permeability, characterized in that: It includes a control system and includes, respectively connected to the control system, Raw strip rolls; A constant tension mechanism, the constant tension mechanism comprising a first electromagnetic roller mechanism, a force measuring roller, a first transition roller, a second transition roller and a second electromagnetic roller mechanism arranged in sequence, the force measuring roller being provided with a tension sensor; A heat treatment mechanism, wherein the heat treatment mechanism is provided with at least one set of laser heating equipment capable of adjusting laser intensity; A magnetic core winding mechanism is provided at a side of a discharge end of the second electromagnetic roller mechanism, and is used to wind and cut the strip material according to a winding signal output by the control system to prepare a magnetic core; The constant tension mechanism is arranged at one side of the discharge end of the original strip roller, and the control system outputs a tension control signal based on the received tension sensor signal and the set constant tension value to adjust the magnetic attraction force and rotation speed of the first electromagnetic roller mechanism and the second electromagnetic roller mechanism; The heat treatment mechanism is disposed between the first transition roller and the second transition roller, and performs heat treatment on the strip based on a heat treatment signal output by the control system.

2. The amorphous nanocrystalline magnetic core heat treatment device according to claim 1, characterized in that: The first electromagnetic roller mechanism and the second electromagnetic roller mechanism each include at least one electromagnetic roller.

3. The amorphous nanocrystalline magnetic core heat treatment device according to claim 2, characterized in that: The electromagnetic roller is provided with a plurality of groups of electromagnets, the periphery of the electromagnets is wound with coils, and the rest of the electromagnetic roller is made of non-magnetic material.

4. The amorphous nanocrystalline magnetic core heat treatment device according to claim 3, characterized in that: The electromagnet on the electromagnetic roller is electrically connected to the control system, and the control system regulates the electromagnetic attraction of the electromagnetic roller on the strip.

5. The amorphous nanocrystalline magnetic core heat treatment device according to claim 1, characterized in that: The original strip roller, the constant tension mechanism, and the magnetic core winding mechanism are all connected to a driving device, and a controlled end of the driving device is connected to the control system.

6. The amorphous nanocrystalline magnetic core heat treatment device according to claim 1, characterized in that: The laser heating device comprises a first laser heating device and a second laser heating device, which are respectively arranged on the upper and lower sides of the strip and can independently set different laser intensities.

7. The amorphous nanocrystalline magnetic core heat treatment device according to claim 1, characterized in that: The laser heating device is connected to a temperature measuring element, and the temperature measuring element is connected to a display for displaying temperature in real time.

8. The amorphous nanocrystalline magnetic core heat treatment device according to claim 1, characterized in that: The magnetic core winding mechanism includes, arranged in sequence, A traction roller assembly, comprising at least one pair of first traction rollers and second traction rollers respectively arranged on upper and lower sides of the strip; A limit pressing block assembly, comprising a first limit pressing block and a second limit pressing block respectively arranged on the upper and lower sides of the strip; A cutter assembly, comprising a first cutter and a second cutter respectively arranged on the upper and lower sides of the strip; A first guide plate, horizontally arranged between the limiting pressure block assembly and the cutter assembly; The winding roller comprises a winding core sleeved on a winding shaft, and a resistance welding mechanism arranged corresponding to the winding core, wherein the resistance welding mechanism comprises an external welding mechanism and an internal welding mechanism; The second guide plate is horizontally arranged between the cutter assembly and the winding roller.

9. The amorphous nanocrystalline magnetic core heat treatment device according to claim 8, characterized in that: A measuring sensor is provided on the side of the winding roller. The measuring sensor includes an outer diameter measuring sensor and a strip winding number sensor, which are respectively used to measure the outer diameter and the number of windings of the magnetic core of the strip winding in real time.

10. A method for preparing an amorphous nanocrystalline magnetic core with constant magnetic permeability, applied to the amorphous nanocrystalline magnetic core heat treatment device according to any one of claims 1 to 9, characterized in that: include, Step S1, unwinding and position adjustment: placing the strip on the original strip roller, and passing the strip through the constant tension mechanism, the heat treatment mechanism, the magnetic core winding mechanism in sequence, and conveying it to the winding roller; Step S2, parameter setting: setting parameters including at least heat treatment temperature, strip internal tension value, strip transmission speed, strip width, strip thickness, magnetic core inner diameter, and magnetic core outer diameter to the control system; based on the monitoring result of the tension sensor on the force measuring roller, transmitting the tension sensor signal to the control system, and the control system adjusts the magnetic attraction and rotation speed of the first electromagnetic roller mechanism and the second electromagnetic roller mechanism; Step S3, constant tension heat treatment: start the switches of all mechanisms on the control system, the device completes the heat treatment of the strip under constant tension control, and the magnetic core winding mechanism winds the strip into a magnetic core of a preset size; Step S4, stress relief heat treatment: the magnetic core obtained after constant tension heat treatment and winding is placed in an external heat treatment furnace for stress relief heat treatment, and the finished magnetic core is obtained after cooling to room temperature.

11. The method for preparing an amorphous nanocrystalline magnetic core according to claim 10, characterized in that: In step S4, the holding temperature of the stress relief heat treatment is 200° C.-400° C., the holding time is 1 h-5 h, and the heat treatment atmosphere is vacuum, inert gas or hydrogen.

Images