A magnetic core heat treatment tool

Abstract

This invention provides a heat treatment fixture for magnetic cores, relating to the field of magnetic core heat treatment technology, and applied to the heat treatment process of permalloy magnetic cores. The permalloy magnetic core includes a central leg and three parallel side legs (a first, a second, and a third) arranged perpendicularly to the central leg. The first and second side legs are located at the ends of the central leg on both sides, and the third side leg is located between the first and second side legs, with the distance between the third and first side legs being greater than the distance between the third and second side legs. The heat treatment fixture includes spaced-apart crossbeams with upward-facing support planes on them. The support planes are horizontally aligned with the first side legs, allowing the permalloy magnetic core to lie vertically on the crossbeams. The width of the support planes is less than the distance between the third and first side legs. This invention, through adaptive design of the magnetic core and the heat treatment fixture, can reduce thermal deformation during magnetic core heat treatment and improve heat treatment efficiency.

Description

Technical Field

[0001] This utility model relates to the field of magnetic core heat treatment technology, and in particular to a magnetic core heat treatment tool. Background Technology

[0002] A magnetic core heat treatment fixture is a specialized tooling device used in the processing of magnetic materials to support and fix the magnetic core workpiece and ensure the stability of its heat treatment process. Its core function is to prevent deformation of the magnetic core due to stress release or its own weight during high-temperature treatment through reasonable structural design. Especially for magnetic cores with irregular structures, the support stability of the fixture directly affects the final dimensional accuracy of the product.

[0003] Currently, the industry commonly uses flat-lay material boxes as heat treatment material racks. These boxes consist of perforated trays or rectangular containers with horizontally arranged perforations. Magnetic cores are directly laid flat on the bottom of the box for loading into the furnace. For example, with irregularly shaped permalloy magnetic cores, existing processes typically place them horizontally inside the box, with each leg of the core in natural contact with the bottom of the box. Material properties are controlled through overall heating during heat treatment.

[0004] However, the contact surface between the irregularly shaped permalloy core and the material box is only linear. When heat conduction is uneven, it will aggravate local stress concentration, thereby inducing end face distortion and causing warping in some areas. This deformation problem directly affects the assembly accuracy and electromagnetic performance of the core. Customers need to perform additional reshaping during use, increasing production costs and making it difficult to guarantee the yield rate. At the same time, the horizontal placement of the core in a single layer requires the reservation of anti-collision gaps, resulting in insufficient furnace loading density, low single-batch processing volume, and ultimately low overall heat treatment efficiency. Utility Model Content

[0005] Based on this, the purpose of this utility model is to provide a heat treatment tool for magnetic cores, which aims to reduce thermal deformation and improve heat treatment efficiency when heat treating irregularly shaped permalloy magnetic cores.

[0006] To achieve the above objectives, this utility model proposes a heat treatment fixture for magnetic cores, applied in the heat treatment process of permalloy magnetic cores. The permalloy magnetic core includes a central leg and a first side leg, a second side leg, and a third side leg arranged parallel to each other and perpendicular to the central leg. The first side leg and the second side leg are respectively located at the ends of the two sides of the central leg. The third side leg is located between the first side leg and the second side leg, and the distance between the third side leg and the first side leg is greater than the distance between the third side leg and the second side leg. The heat treatment fixture includes a crossbeam arranged at intervals. The crossbeam has an upward-facing support plane. The support plane is horizontally attached to the first side leg so that the permalloy magnetic core lies vertically on the crossbeam. The width of the support plane is less than the distance between the third side leg and the first side leg.

[0007] In addition, the magnetic core heat treatment tool described above according to this utility model may also have the following additional technical features: Furthermore, the crossbeam is provided with positioning planes on both sides of the width direction of the support plane, and both positioning planes are perpendicular to the support plane.

[0008] Furthermore, the length of the first side leg is greater than the length of the second side leg, the length of the first side leg is greater than the length of the third side leg, and the width of a set of positioning planes is less than the length of the first side leg.

[0009] Furthermore, the width of the other set of positioning planes is greater than the length of the third leg.

[0010] Furthermore, the length of the second side leg is equal to the length of the third side leg.

[0011] Furthermore, the crossbeams are arranged in parallel, and the distance between the permalloy magnetic cores placed on two adjacent crossbeams is set to 5mm to 10mm.

[0012] Furthermore, both sides of the crossbeam along its length are connected by connecting plates to form a frame structure.

[0013] Furthermore, the frame structure is provided with bases at its four corners.

[0014] The beneficial effects of this invention include at least the following: Placing the open side of the middle leg of the magnetic core flat against the support plane on the crossbeam ensures that the magnetic core does not tilt or slip, allowing the permalloy magnetic core to be stably placed on the crossbeam in a vertical, horizontal position. This allows the side legs, perpendicular to the middle leg, to hang naturally, maintaining a straight shape under their own weight, thus avoiding the localized warping and deformation that occurs with traditional horizontal placement. Simultaneously, the close arrangement of adjacent magnetic cores creates a mutually compressive constraint structure between the middle cores, while the adjacent cores on either side form lateral restraints, which can suppress the movement of the magnetic core. The free deformation of the two end faces at high temperatures ensures that the magnetic core does not shift or twist during heat treatment. In addition, the magnetic core is placed in a vertical insertion manner, while the crossbeam adopts a parallel arrangement and frame structure, which makes the overall structure stable, facilitates batch loading and unloading, and improves operating efficiency. Compared with the traditional flat laying mode, the loading density is effectively improved, the amount of heat treatment per batch is greatly increased, and the production efficiency is improved. Furthermore, the optimized design of the width of the support plane (less than the distance between the third leg and the first leg) can ensure that permalloy magnetic cores of various sizes can be placed stably, avoiding the magnetic core tilting or slippage caused by the support plane being too wide. Attached Figure Description

[0015] Figure 1 This is a first-view structural schematic diagram of the magnetic core heat treatment tool in one embodiment of the present invention. Figure 2 This is a second-view structural schematic diagram of the magnetic core heat treatment tool in one embodiment of the present invention. Figure 3 This is a third-view structural schematic diagram of the magnetic core heat treatment tool in one embodiment of the present invention; Explanation of key component symbols: Middle leg 100, first side leg 200, second side leg 300, third side leg 400, crossbeam 500, support plane 510, positioning plane 520, connecting plate 530, base 540; The following detailed description, in conjunction with the accompanying drawings, will further illustrate this utility model. Detailed Implementation

[0016] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. Several embodiments of this utility model are shown in the drawings. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this utility model will be more thorough and complete.

[0017] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0018] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0019] Please see Figures 1 to 3 This embodiment provides a heat treatment fixture for a magnetic core, applied in the heat treatment process of permalloy magnetic cores. Permalloy, also known as a permeable alloy, is a special alloy with iron and nickel as its main components. Specifically, the permalloy magnetic core includes a central leg 100 and three parallel side legs 200, 300, and 400. The first side legs 200, 300, and 400 are all perpendicular to the central leg 100. The first side legs 200 and 300 are respectively located at the upper and lower ends of the central leg 100. The third side leg 400 is located between the first side legs 200 and 300, and the distance between the third side leg 400 and the first side leg 200 is greater than the distance between the third side leg 400 and the second side leg 300. The heat treatment fixture includes spaced-apart crossbeams 500, with an upward-facing support plane 510 on the crossbeams 500. The width of the support plane 510 is less than the distance between the third leg 400 and the first leg 200 to ensure that the area between the third leg 400 and the first leg 200 of the magnetic core can match the width of the support plane 510, so that the crossbeam 500 will not interfere with the position of the magnetic core. The distance between the third leg 400 and the first leg 200 is set to be greater than the distance between the third leg 400 and the second leg 300 to avoid the weight of the part between the third leg 400 and the second leg 300 of the magnetic core being greater than the weight of the part between the third leg 400 and the second leg 300 of the magnetic core, and to ensure that the magnetic core does not tilt or slip when placed on the crossbeam 500.

[0020] In this embodiment, during loading, the permalloy core is positioned with the open side facing downwards until the plane of the first leg 200 of the core facing the open side is horizontally aligned with the supporting plane 510. At this point, the entire core lies vertically on the crossbeam 500. Optionally, to ensure that the crossbeam 500 has good heat transfer capacity and structural strength during heat treatment, the crossbeam 500 can be made of materials such as iron or steel.

[0021] In some alternative embodiments, such as Figure 1 and Figure 2 As shown, the crossbeam 500 has positioning planes 520 on both sides of the support plane 510 in the width direction. Both positioning planes 520 are perpendicular to the support plane 510. This prevents the magnetic core from moving laterally during heat treatment, ensuring that all magnetic cores maintain a consistent vertical posture. Furthermore, when the magnetic core is placed vertically on the crossbeam 500, the positioning planes 520, perpendicular to the support plane 510, facilitate the vertical sliding of the third side leg 400 and the first side leg 200, improving the placement accuracy of the magnetic core. In addition, since the width of the support plane 510 is less than the distance between the third side leg 400 and the first side leg 200, direct contact between the crossbeam 500 and the third side leg 400 and the first side leg 200 is avoided, reducing the uneven temperature distribution of the side legs and minimizing thermal deformation caused by localized thermal stress imbalances in the side legs.

[0022] In some alternative embodiments, such as Figure 3 As shown, the length of the first side leg 200 is greater than the length of the second side leg 300, and the length of the first side leg 200 is greater than the length of the third side leg 400. The width of a set of positioning planes 520 is less than the length of the first side leg 200. This arrangement ensures that the weight of the first side leg 200, the second side leg 300, and the third side leg 400 of the magnetic core is balanced along the axial direction of the middle leg 100, guaranteeing the stability of the magnetic core's center of gravity and ensuring that the magnetic core is stably placed on the crossbeam 500 in a vertical, horizontal position. Simultaneously, the width of the positioning planes 520 is less than the length of the first side leg 200, facilitating the retrieval of the magnetic core via the longer first side leg 200.

[0023] In some alternative embodiments, such as Figure 3 As shown, the width of the other set of positioning planes 520 is greater than the length of the third leg 400. With this configuration, when the magnetic core experiences slight oscillations due to thermal expansion or mechanical vibration, the third leg 400 of the magnetic core is always located within the containment space of the positioning plane 520. This allows for self-correction through the frictional resistance generated when the two collide, thereby reducing the attenuation rate of the oscillation amplitude.

[0024] In some alternative embodiments, such as Figure 3As shown, the length of the second leg 300 is equal to the length of the third leg 400. This arrangement can form a locally symmetrical structure and avoid torsional stress in the magnetic core due to asymmetrical thermal expansion during heat treatment.

[0025] In some alternative embodiments, such as Figure 1 , Figure 2 As shown, the crossbeams 500 are arranged in parallel, which makes the magnetic cores neatly arranged, which can increase the loading capacity and the amount of heat treatment per batch. At the same time, while ensuring a certain amount of heat treatment per batch, it is convenient for the magnetic cores to dissipate heat. The distance L between the permalloy magnetic cores placed on two adjacent crossbeams 500 is set to 5mm to 10mm.

[0026] In some alternative embodiments, such as Figure 1 , Figure 2 As shown, both sides of the crossbeam 500 along its length are connected by connecting plates 530 to form a frame structure, thereby enhancing the overall structural strength of the crossbeam 500.

[0027] In some alternative embodiments, such as Figures 1 to 3 As shown, bases 540 are provided at the four corners of the frame structure so that the crossbeam 500 is suspended in the air, allowing the magnetic core on the crossbeam 500 to be fully heat-treated.

[0028] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0029] The above-described embodiments are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of protection of this utility model. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the scope of protection of this utility model. Therefore, the scope of protection of this utility model should be determined by the appended claims.

Claims

1. A tool for heat treatment of magnetic cores, characterized in that, In the heat treatment process of permalloy magnetic cores, the permalloy magnetic core includes a central leg and three parallel side legs, a first side leg, a second side leg, and a third side leg, all perpendicular to the central leg. The first and second side legs are located at the ends of the central leg on both sides. The third side leg is located between the first and second side legs, and the distance between the third side leg and the first side leg is greater than the distance between the third side leg and the second side leg. The heat treatment fixture for the magnetic core includes spaced-apart crossbeams. The crossbeams have an upward-facing support plane. The support plane is horizontally attached to the first side leg so that the permalloy magnetic core lies vertically on the crossbeam. The width of the support plane is less than the distance between the third side leg and the first side leg.

2. The magnetic core heat treatment fixture according to claim 1, characterized in that, The crossbeam is provided with positioning planes on both sides of the width direction of the support plane, and both positioning planes are perpendicular to the support plane.

3. The magnetic core heat treatment fixture according to claim 2, characterized in that, The length of the first side leg is greater than the length of the second side leg, the length of the first side leg is greater than the length of the third side leg, and the width of a set of positioning planes is less than the length of the first side leg.

4. The magnetic core heat treatment fixture according to claim 3, characterized in that, The width of the other set of positioning planes is greater than the length of the third leg.

5. The magnetic core heat treatment tool according to claim 4, characterized in that, The length of the second side leg is equal to the length of the third side leg.

6. The magnetic core heat treatment tool according to any one of claims 1 to 5, characterized in that, The crossbeams are arranged in parallel, and the distance between the permalloy magnetic cores placed on two adjacent crossbeams is set to 5mm to 10mm.

7. The magnetic core heat treatment fixture according to claim 6, characterized in that, Both sides of the crossbeam along its length are connected by connecting plates to form a frame structure.

8. The magnetic core heat treatment fixture according to claim 7, characterized in that, The frame structure has bases at its four corners.

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