Magnetic core tightness testing device and magnetic core processing system

Abstract

The utility model provides a magnetic core tightness testing device and a magnetic core processing system, the magnetic core tightness testing device comprises a clamping part used for positioning and clamping a magnetic core workpiece, and one side of the clamping part corresponding to the periphery of the magnetic core workpiece clamped by the clamping part is provided with a bearing support; a pressurizing part is arranged beside the clamping part, the pressurizing part comprises a baffle and a pressing driving device, the baffle is arranged on the other side corresponding to the periphery of the magnetic core workpiece, the pressing driving device drives the baffle to reciprocate towards the magnetic core workpiece, and the pressing driving device is electrically connected with a pressure gauge; and a limiting mechanism for limiting the driving distance of the baffle is arranged between the clamping part and the pressurizing part. Through the arrangement of the magnetic core tightness testing device, the tightness condition of the magnetic core workpiece can be effectively detected, and a preliminary judgment basis can be made for the subsequent magnetic performance processing condition of the magnetic core workpiece.

Description

Technical Field

[0001] The utility model relates to the technical field of magnetic core processing, in particular to a magnetic core tightness testing device and a magnetic core processing system. Background Art

[0002] Amorphous material strips, due to their high magnetic permeability, are gradually replacing silicon steel sheets and have become a key material for high-performance transformer cores. Amorphous transformers feature low loss, high permeability, compact size, and the absence of transformer oil cooling. Due to the thinness of amorphous material strips, a large transformer core requires tens or even hundreds of thousands of layers, making manual winding laborious and inefficient. The varying shapes of winding dies for transformer cores place high demands on automated winding. Round dies are easiest to wind because they offer easy speed control and uniform force distribution during the winding process. However, rectangular dies can experience dynamic changes in the die radius within one rotation of the winding motor, leading to unstable surface linear velocity on the core, uneven force distribution, and varying core tightness. Excessive tightness can affect the core's shape stability and, in severe cases, lead to flake loosening. Furthermore, the tightness of the core winding can affect its magnetic properties after heat treatment. Utility Model Content

[0003] The purpose of the utility model is to overcome the shortcomings of the existing technology and provide a magnetic core tightness testing device and a magnetic core processing system for application; through the application of the magnetic core tightness testing device, the tightness of the wound magnetic core workpiece is clearly confirmed first, so as to confirm that the workpiece meets the tightness requirements of the target product before the subsequent processing steps are performed on the magnetic core workpiece.

[0004] A magnetic core tightness testing device includes a clamping part for positioning and clamping a magnetic core workpiece, the clamping part having a supporting support on one side corresponding to the outer periphery of the magnetic core workpiece it clamps; a pressurizing part is provided next to the clamping part, the pressurizing part includes a baffle provided on the other side corresponding to the outer periphery of the magnetic core workpiece and a pressing drive device for driving the baffle to reciprocate toward the magnetic core workpiece, the pressing drive device is electrically connected to a pressure gauge; a limiting mechanism is provided between the clamping part and the pressurizing part for limiting the driving distance of the baffle.

[0005] The magnetic core workpiece is effectively clamped and supported by the clamping part, and the pressurizing distance is limited by the limit mechanism. Under the condition of a uniform preset pressurizing distance, the pressurizing part is used to pressurize the magnetic core workpiece; the magnetic core workpiece is deformed after pressurization, and the pressure displayed by the pressure gauge under the deformation state of each magnetic core workpiece is recorded to confirm the tightness of the magnetic core workpiece.

[0006] Furthermore, the magnetic core workpiece is arranged in an annular shape, and the magnetic core workpiece is in a circular ring shape or a runway ring shape. The clamping part is adapted to clamp the annular magnetic core workpiece in the width direction, and the pressurizing part applies height-direction pressure to the magnetic core workpiece from the upper outer periphery in the height direction of the magnetic core workpiece.

[0007] Furthermore, the clamping part includes two side clamping members for clamping the thickness position of the magnetic core and a bottom plate supporting the bottom side of the outer periphery of the magnetic core workpiece. The distance adjustment mechanism is connected between the two side clamping members, and the clamping members on both sides and the bottom plate are arranged in a U shape; the baffle is arranged corresponding to the upper position of the space between the two side clamping members.

[0008] Furthermore, the pressing drive device includes a linear driving cylinder connected to the baffle, and the linear driving cylinder drives the baffle to perform a reciprocating linear driving pressing motion toward the space between the clamping members on both sides.

[0009] Furthermore, a fixed distance is set between the linear drive cylinder and the clamping part, and the limiting mechanism includes a control module electrically connected to the linear drive cylinder, and the control module controls the driving end of the linear drive cylinder to link the baffle to perform a limiting driving movement of a preset distance.

[0010] Furthermore, the limiting mechanism includes a mounting bracket, and the linear drive cylinder and the baffle are mounted on the mounting bracket, and the horizontal drive device and the lifting drive device are connected between the mounting bracket and the linear drive cylinder.

[0011] Furthermore, the pressure gauge includes a pressure sensor, which is arranged on a side of the baffle facing the clamping portion, and the pressure sensor is electrically connected to a digital display screen.

[0012] A magnetic core processing system, which uses the magnetic core tightness testing device described above; also includes a heat treatment device for heat treating the magnetic core workpiece after the tightness test, a magnetizing device for magnetizing the magnetic core workpiece; and also includes a magnetic detection device for detecting the magnetic properties of the magnetic core product prepared after the heat treatment and / or magnetization treatment.

[0013] The beneficial effects of the present invention are:

[0014] The utility model provides a magnetic core tightness testing device to effectively detect the tightness of a magnetic core workpiece, thereby making a preliminary judgment on the subsequent magnetic performance processing of the magnetic core workpiece. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the structure of the magnetic core tightness testing device of the present invention;

[0016] Figure 2 This is a schematic diagram of the deformation of the magnetic core workpiece during the tightness test of the magnetic core workpiece of the utility model;

[0017] Figure 3 Schematic diagram of the relationship between pressure value and baffle downward movement distance;

[0018] Figure 4 Schematic diagram of the relationship between the test inductance Ls of the magnetic core product and the tightness F of the magnetic core workpiece used to prepare it;

[0019] Figure 5 is the fitting curve of the toroidal core inductance Ls and tightness F;

[0020] Figure 6 Schematic diagram of the dimensions of the toroidal core and the racetrack core;

[0021] Figure 7 It is the fitting curve of the inductance Ls and tightness F of the racetrack-shaped magnetic core.

[0022] Reference numerals:

[0023] Clamping part 1, clamping member 11, bottom plate 12, distance adjustment mechanism 13,

[0024] Pressurizing part 2, baffle 21, pressing drive device 22, pressure sensor 23,

[0025] Limiting mechanism 3, mounting bracket 31, horizontal drive device 32, lifting drive device 33, control module 34,

[0026] Magnetic core workpiece 4, digital display screen 5. DETAILED DESCRIPTION

[0027] In order to make the technical solution, purpose and advantages of the present invention more clearly understood, the present invention is further explained below with reference to the accompanying drawings and embodiments.

[0028] The magnetic core processing system of the present invention includes a heat treatment device and a magnetization device. The heat treatment device can be used to heat the magnetic core workpiece 4; the magnetization device can be used to magnetize the magnetic core workpiece 4. Based on the application of heating and / or magnetization treatment to the magnetic core, the magnetic properties of the corresponding magnetic core workpiece 4 are optimized to obtain a magnetic core product with target magnetic properties for use in different types of inductor products and transformer products. After the magnetic core product is prepared, it is generally necessary to test the magnetic properties of the magnetic core product with a magnetic detection device to ensure the product's magnetic performance.

[0029] As for the processing of the magnetic core workpiece 4, one of the conventional processing methods in this field is winding processing. The magnetic core workpiece 4 obtained by winding processing involves the problem of winding tightness. If the tightness of the wound magnetic core workpiece 4 is too loose, it will affect the stability of the core shape, and in severe cases it will cause the pieces to fall apart. Winding too tightly will also affect the core structure. At the same time, different tightness conditions will also affect the magnetic properties of the magnetic core workpiece 4 after heat treatment or magnetization treatment.

[0030] like Figure 1 and Figure 2 As shown, in view of this, in the magnetic core processing system of the present invention, it is proposed to use a magnetic core tightness testing device to perform a pre-processing test on the magnetic core workpiece 4 before heat treatment and / or magnetization treatment, and only when the tightness of the magnetic core workpiece 4 reaches the tightness required for the preparation of the target magnetic core product can the subsequent processing steps be carried out, thereby effectively saving the processing cost of the magnetic core and avoiding the unqualified magnetic core workpiece 4 from still undergoing subsequent processing applications.

[0031] The processing steps are as follows: Step 01, obtain an annular magnetic core workpiece; Step 02, execute a pretreatment method for magnetic core processing to pre-process, screen and distinguish the magnetic core workpiece; Step 03, further process the screened qualified magnetic core workpiece to obtain a magnetic core product; Step 04, set a magnetic performance test standard, and screen the obtained magnetic core products according to the magnetic performance test standard to select qualified magnetic core products.

[0032] Specifically, the basic structure of the magnetic core tightness testing device is applied as follows: it includes a clamping part 1 for positioning and clamping the magnetic core workpiece 4, and the clamping part 1 has a supporting support on one side corresponding to the outer periphery of the magnetic core workpiece 4 clamped by it; a pressurizing part 2 is provided next to the clamping part 1, and the pressurizing part 2 includes a baffle 21 provided on the other side corresponding to the outer periphery of the magnetic core workpiece 4 and a pressing drive device 22 for driving the baffle 21 to reciprocate toward the magnetic core workpiece 4, and the pressing drive device 22 is electrically connected to a pressure gauge; a limiting mechanism 3 is provided between the clamping part 1 and the pressurizing part 2 to limit the driving distance of the baffle 21.

[0033] The application principle of this magnetic core tightness test device is as follows: through the cooperation of the clamping part 1 and the pressurizing part 2, the baffle 21 in the pressurizing part 2 can press the end face of the magnetic core workpiece 4, causing the end face to deform. The degree of tightness can be effectively judged by the relationship between the specific shape change and the applied pressure. Based on preliminary experiments, a suitable standard for the tightness of the magnetic core of a specific structural shape and alloy composition is determined. This is used as the tightness test standard. The tightness of each subsequent magnetic core workpiece 4 is tested and judged accordingly, and the magnetic core workpiece 4 is screened and classified. Only magnetic core workpieces 4 that meet the tightness test standard can be processed in the next stage, which serves as a pre-processing screening and differentiation.

[0034] Example 1:

[0035] For the wound magnetic core workpiece 4 of iron-based amorphous alloy or iron-based amorphous nanocrystalline alloy, its shape is basically set to be ring-shaped, and is optionally set to be a circular ring or a racetrack ring; this embodiment is used to illustrate the processing application of the magnetic core workpiece 4 with the above-mentioned optional alloy composition and shape structure.

[0036] This embodiment provides a specific structural setting scheme of a magnetic core tightness testing device to meet the pre-processing application of the magnetic core workpiece 4: Figure 1 As shown, the clamping part 1 includes two side clamping members 11 for clamping the thickness position of the magnetic core and a bottom plate 12 for supporting the bottom side of the outer periphery of the magnetic core workpiece 4. The distance adjustment mechanism 13 is connected between the two side clamping members 11, and the two side clamping members 11 and the bottom plate 12 are arranged in a U shape; the baffle 21 is set corresponding to the upper position of the space between the two side clamping members 11.

[0037] The pressing drive device 22 includes a linear drive cylinder connected to the baffle 21. The linear drive cylinder is set at a fixed distance from the clamping portion 1. The linear drive cylinder drives the baffle 21 to perform a reciprocating linear drive pressing motion toward the space between the two clamping members 11. The limiting mechanism 3 includes a control module 34 electrically connected to the linear drive cylinder. The control module 34 controls the driving end of the linear drive cylinder to drive the baffle 21 to perform a limited driving motion of a preset distance.

[0038] Furthermore, the limiting mechanism 3 includes a mounting bracket 31 arranged on the base plate 12, and the linear drive cylinder and baffle 21 are mounted on the mounting bracket 31, and a horizontal drive device 32 and a lifting drive device 33 are connected between the mounting bracket 31 and the linear drive cylinder to meet the position adjustment requirements of the linear drive cylinder and the baffle 21 relative to the base plate 12 and the clamping parts 11 on both sides.

[0039] In the pressure gauge, its pressure sensor 23 is arranged on the lower side of the baffle 21 (toward the clamping part 1), and the pressure sensor 23 is electrically connected to a digital display screen 5, which can display the sensed value of the pressure sensor 23 in real time. The digital display screen 5 is installed on the base plate 12 to realize the integrated setting of the magnetic core tightness testing device.

[0040] During application, under normal conditions, the pressurizing portion 2 is staggered relative to the clamping portion 1 to make room for the magnetic core workpiece 4. When testing the tightness of the magnetic core workpiece 4, the magnetic core workpiece 4 is first placed in the clamping portion 1, and then the horizontal drive device 32 and the lifting drive device 33 connected between the mounting bracket 31 and the linear drive cylinder are driven, so that the linear drive cylinder and the baffle 21 in the initial working state are lightly touched to the upper side of the magnetic core workpiece 4. At this time, the sensing value fed back by the pressure sensor 23 returns to zero.

[0041] Then, the control module 34 controls and drives the linear drive cylinder to drive the baffle 21 to press down and cause the magnetic core workpiece 4 to deform. The deformation of the magnetic workpiece is as follows: Figure 2 As shown, the deformation distance is a fixed up-and-down displacement distance h. After the pressing movement, the data of the pressure sensor 23 at this time is recorded. The data is the tightness value of the magnetic core workpiece 4.

[0042] The specific application steps of the above-mentioned pretreatment method of the magnetic core workpiece are as follows:

[0043] Step S1: Place the runway ring-shaped magnetic core workpiece 4 into the clamping portion 1, and place one end of the magnetic core workpiece 4 in the longitudinal direction into the space between the U-shaped two-side clamping members 11 and the bottom plate 12. Drive the two-side clamping members 11 to position and clamp the magnetic core workpiece 4 in the width direction, and the bottom plate 12 supports the magnetic core workpiece 4 in the longitudinal direction. Then, drive the baffle 21 with the pressing drive device 22 to apply pressure to the other end of the magnetic core workpiece 4 in the longitudinal direction.

[0044] Step S2: As the baffle 21 applies pressure to the other end of the lengthwise side of the magnetic core workpiece 4, the magnetic core workpiece 4 undergoes a shape change in which it moves downward and narrows in the height direction and extends horizontally in the length direction; when the applied pressure causes the magnetic core workpiece 4 to move downward to the target distance in the height direction, it is considered that the magnetic tool has deformed to a specific shape change, and the pressure value applied at this time is recorded as the tightness value, thereby completing the tightness test of the magnetic core workpiece 4.

[0045] Step S3: Based on the preliminary experimental conditions, it is clear that under the condition of the shape of the runway ring magnetic core and the composition of the iron-based amorphous alloy, there will be a suitable range of the core tightness of the magnetic core workpiece 4. The range of the core tightness is used as the tightness detection standard of the magnetic core workpiece 4; and then according to the tightness detection standard, the magnetic core workpiece 4 undergoing the tightness test is screened to select qualified magnetic core workpieces 4 for subsequent processing preparation.

[0046] Example 2:

[0047] The tighter the core workpiece 4 is, the greater its lamination factor is, the harder it is to deform the coil, and the greater the pressure required for deformation. Therefore, the pressure applied by the baffle 21 to the core workpiece 4 to cause the workpiece to deform quantitatively can be used as a value that can reflect the tightness of the core workpiece 4. The following describes an application example of tightness detection of a core workpiece 4:

[0048] For a ring-shaped magnetic core workpiece 4, the relationship between the height change (movement distance of the baffle 21) and the applied pressure during its deformation process is as follows: Figure 3 As shown, the curve changes in a trend. As the distance increases, more pressure needs to be applied to deform the core, and the slope will become larger and larger, showing a nonlinear relationship. The measured results can be approximately fitted into a curve (formula). The applied curve formula is pressure = a * moving distance of the baffle 21 2 +b*movement distance of the baffle 21 +c (the specific numerical ranges of a, b, and c will be set differently according to different materials and lamination conditions; a, b, and c are obtained through fitting).

[0049] As for the application in step S3 of the above embodiment, the relationship between the inductance value and the tightness of the magnetic core obtained by heat treatment and magnetization treatment of the iron core workpiece based on a certain iron-based amorphous alloy composition is as follows: Figure 4 shown.

[0050] If the tightness of the core workpiece 4 is too loose, its lamination coefficient K is low, the effective cross-sectional area Ae of the core is low, and the inductance value Ls is low; if the tightness of the core workpiece 4 is too tight, its stress cannot be released after heat treatment and magnetization treatment, and the inductance value Ls is low. Figure 2 The relationship between the above curves can guide the control of the tightness F: in order to control the inductance Ls of the target magnetic core product within the range of Ls1 and Ls2, the corresponding magnetic core workpiece 4 before heat treatment and magnetization treatment will need to meet the tightness F within the range of F1 to F2 or F3 to F4.

[0051] Specifically, a (40*64*20) mm annular Fe-based alloy magnetic core workpiece (strip thickness of 20 μm) was placed between the clamps 11 and the base plate 12 on both sides. The baffle 21 was driven to move downward toward the circular cross-section of the magnetic core workpiece 4 until it came into contact with the magnetic core workpiece 4 and stopped. At this point, the downward movement distance of the baffle 21 was calculated to be 0, and the pressure was also 0. The test was then started, and the downward movement distance and pressure were measured. The test ended when the baffle 21 moved down to 20 mm. A curve of pressure changing with the downward movement distance of the baffle 21 was obtained. The maximum pressure value F was the current tightness of the magnetic core workpiece 4.

[0052] The core workpiece was then subjected to heat treatment and magnetization treatment at 560°C, followed by magnetization at 450°C for 60 minutes with a magnetization current of 350A. The core product was obtained, and the inductance value Ls of the core product was tested. The corresponding test data of Ls and F are as follows:

[0053]

[0054] According to the data, the relationship curve between the sense value Ls and the tightness F is fitted, as shown in the figure: Figure 5 The curve formula is Ls = -1.4176F 2 +55.486F-420.03, according to the set magnetic performance test standard, determine the Ls range of the target magnetic core products produced this time (the Ls range of qualified products is 90~125μH). The setting range of the tightness F test standard is a continuous range (the tightness F range is 14.7~24.3N).

[0055] When the tightness test is done on a circular ring, the relevant values are related to the size of the core. The inductance is affected by the size of the core. If the core size is different, the inductance will also be different. μ' is the magnetic permeability, Ae and Le are the effective core cross-sectional area and average magnetic path length, respectively, which are related to the core size.

[0056] Example 3:

[0057] Based on the application principle of the above embodiment, this embodiment describes the processing settings of a racetrack-shaped magnetic core workpiece 4 with an A*C+B*D / E structure.

[0058] The A*C+B*D / E racetrack core is formed by inserting the corresponding ID*OD*HT ring core into the inner and outer molds. Figure 6As shown; for a toroidal core, OD-ID is the ring width of the toroidal core, OD is the height of the toroidal core in the vertical direction, and the length of the toroidal core in the horizontal direction, and HT is the width of the core; for a racetrack core, AC and BD are generally equidistant and regarded as the ring width of the core, the horizontal dimension A is the length of the core, the vertical dimension B is the height of the core, and the dimension E is the width of the core.

[0059] During the tightness detection process of the magnetic core, the clamping part supports the lower part of the magnetic core workpiece and clamps the magnetic core workpiece in the width direction. The pressure applied to the magnetic core workpiece includes applying pressure from the upper side to the magnetic core workpiece in the height direction downward; in step S2, the magnetic core workpiece undergoes a shape change in which it narrows in the height direction and lengthens in the length direction.

[0060] In the case where the magnetic core workpiece is narrowed in the height direction, the narrowing change in this direction is set to be greater than 10% of the height of the magnetic core workpiece and less than 50% of the height of the magnetic core workpiece; or in the case where the magnetic core workpiece is narrowed in the height direction, the narrowing change in this direction is set to be greater than 10% of the ring width and less than 50% of the height of the magnetic core workpiece.

[0061] Among them, Bπ+2(CD)=OD*π, Dπ+2(CD)=ID*π, and E=HT. Specifically, for a (50*30+40*20 / 15)mm racetrack-shaped core, it is shaped from a (26.3*46.3*15)mm annular core. After the annular core is wound, the baffle 21 of the tightness tester is moved down 10mm to end the test method to test the tightness F of the annular core. After the test, the corresponding mold is installed and fixed, and heat-treated at 450℃ for shaping. After shaping, the mold is removed, and the shaped racetrack-shaped core is heat-treated at 560℃, and then magnetized at 350℃ for 60min with a magnetizing current of 350A to test the Ls of the core. The data of Ls and F are as follows:

[0062]

[0063] According to the data, a curve is fitted, such as Figure 7 shown.

[0064] The curve formula obtained is Ls = -1.3865F 2 +48.845F-287.57, according to the set magnetic performance test standard, determine the Ls range of the target magnetic core product of this production (the Ls range of qualified products is 110~140μH), and the setting range of the tightness F test standard is a discontinuous range (the tightness F test standard range is 12.7~16.2N or 18.9~22.4N).

[0065] The above is only a preferred embodiment of the present invention. Those skilled in the art can modify the embodiment without departing from the implementation principle of the present invention, and the corresponding modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A magnetic core tightness testing device, characterized in that: It includes a clamping part for positioning and clamping the magnetic core workpiece, and the clamping part has a supporting support on one side corresponding to the outer periphery of the magnetic core workpiece it clamps; a pressurizing part is set next to the clamping part, and the pressurizing part includes a baffle set on the other side corresponding to the outer periphery of the magnetic core workpiece and a pressing drive device that drives the baffle to reciprocate toward the magnetic core workpiece, and the pressing drive device is electrically connected to a pressure gauge; a limiting mechanism is set between the clamping part and the pressurizing part to limit the driving distance of the baffle.

2. The magnetic core tightness testing device according to claim 1, characterized in that: The magnetic core workpiece is arranged in an annular shape, and the magnetic core workpiece is in a circular ring shape or a racetrack ring shape. The clamping part is adapted to clamp the magnetic core workpiece in the width direction, and the pressurizing part applies height-direction pressure to the magnetic core workpiece from the upper outer periphery in the height direction of the magnetic core workpiece.

3. The magnetic core tightness testing device according to claim 2, characterized in that: The clamping part includes two side clamping parts for clamping the thickness position of the magnetic core and a bottom plate supporting the bottom side of the outer periphery of the magnetic core workpiece. The distance adjustment mechanism is connected between the two side clamping parts, and the clamping parts on both sides and the bottom plate are arranged in a U shape; the baffle is arranged corresponding to the upper position of the space between the two side clamping parts.

4. The magnetic core tightness testing device according to claim 3, characterized in that: The pressing drive device includes a linear driving cylinder connected to the baffle, and the linear driving cylinder drives the baffle to perform a reciprocating linear driving pressing motion toward the space between the clamping members on both sides.

5. The magnetic core tightness testing device according to claim 4, characterized in that: A fixed distance is set between the linear drive cylinder and the clamping part, and the limiting mechanism includes a control module electrically connected to the linear drive cylinder. The control module controls the driving end of the linear drive cylinder to link the baffle to perform a limiting driving movement of a preset distance.

6. The magnetic core tightness testing device according to claim 5, characterized in that: The limiting mechanism includes a mounting bracket, and the linear drive cylinder and the baffle are mounted on the mounting bracket, and the horizontal drive device and the lifting drive device are connected between the mounting bracket and the linear drive cylinder.

7. The magnetic core tightness testing device according to claim 1, characterized in that: The pressure gauge includes a pressure sensor, which is arranged on a side of the baffle facing the clamping portion, and is electrically connected to a digital display screen.

8. Magnetic core processing system, characterized in that, A magnetic core tightness testing device as described in any one of claims 1 to 7 is used; it also includes a heat treatment device for heat treating the magnetic core workpiece after the tightness test, and a magnetization device for magnetizing the magnetic core workpiece; it also includes a magnetic detection device for detecting the magnetic properties of the magnetic core product prepared after the heat treatment and / or magnetization treatment.

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