Radiation magnetic field heat treatment device and radiation magnetic field heat treatment method for permanent magnet ring

Abstract

The application provides a radiation magnetic field heat treatment device and method for a permanent magnet ring, and belongs to the technical field of permanent magnet material preparation, and comprises a heating unit, a convex pole head for penetrating through the inner hole of the permanent magnet ring, and a concave pole head provided with an accommodating hole for accommodating the permanent magnet ring; the convex pole head and the concave pole head both have magnetism in the working state and the magnetic poles thereof are opposite; when the convex pole head approaches the concave pole head, the convex pole head is inserted into the accommodating hole, and an annular accommodating part for accommodating the permanent magnet ring is formed between the peripheral surface of the convex pole head and the contour of the accommodating hole; and the convex pole head and the concave pole head form a radial magnetic field in the annular accommodating part through the opposite magnetic poles. The application has the beneficial effect that the device can provide a high-temperature heat treatment environment and a radial magnetic field, and can meet the requirement of heat treatment of the permanent magnet ring in the radial magnetic field.

Description

Technical Field

[0001] The invention belongs to the technical field of permanent magnetic material preparation, relates to a radiation magnetic field heat treatment device for a permanent magnetic ring, and also relates to a radiation magnetic field heat treatment method. Background Art

[0002] As an important device, radiating magnetic rings (permanent magnetic rings) play an irreplaceable role in the motor, medical, communication and inertial navigation industries. The complexity of the application environment places higher requirements on the magnetic properties of radiating rings.

[0003] Currently, there are some methods for manufacturing radiation magnetic rings. For example, an invention patent with application number CN200810226970.8, entitled "Processing method of RTB alloy powder for radiation magnetic rings", discloses a scheme for preparing permanent magnet rings using powder metallurgy. This method orients magnetic powder in a radiation magnetic field press to form a blank, so that the easy magnetization direction of the magnetic powder is radially distributed, and then the blank is heat treated. The above method uses a radiation magnetizer to perform radiation orientation magnetization to obtain a radiation-oriented radiation ring. The radiation magnetic ring prepared by powder metallurgy process requires the magnetic powder to be first oriented by radiation magnetic field and then heat treated to obtain the permanent magnet ring. It is not suitable for permanent magnets that induce phase change under magnetic field conditions. In addition, some high-performance permanent magnets are usually prepared by casting process, which requires radiation magnetic field heat treatment under high temperature magnetic field conditions to precipitate radial precipitation phases. The preparation process of conventional rare earth radiation permanent magnet rings cannot meet the conditions of permanent magnet rings made by casting process.

[0004] In addition, an invention patent with application number CN201310242575.X is named "A radial magnetic ring and its preparation method". This method uses a conventional magnetic field orientation press to press magnetic powder into a block. The easy magnetization direction of the magnetic powder is consistent with the direction of the horizontal magnetic field. The block is then heat treated and processed into magnetic tiles. The magnetic tiles are bonded together to form a magnetic ring using colloid, and magnetized using a radiation magnetizer to obtain a radially oriented spliced ​​radial ring. The magnetic ring obtained by the above splicing method is prone to high surface magnetism in the middle and low surface magnetism on both sides after magnetization. Although the surface magnetic consistency can be improved by reducing the size of the magnetic tiles or modifying the edge of the magnetic tiles, this will increase the complexity of the preparation process.

[0005] Alnico permanent magnet materials have been widely used in important fields such as instrumentation, traveling wave tubes, and sensors due to their high operating temperature, excellent temperature stability, mechanical properties, corrosion resistance and other comprehensive properties. Alnico materials undergo phase change at 600℃-860℃, and the magnetic field can be used to guide the directional precipitation of the precipitated phase to further improve the magnetic properties. The complex application environment makes the magnetic signal of the Alnico radiation ring changeable during use. Therefore, the radiation magnetic field heat treatment process can provide the radiation ring with a variable magnetic state to adapt to the complex environment. In addition, the widely used Alnico radiation ring also places higher requirements on the efficiency of the radiation magnetic field heat treatment.

[0006] Therefore, AlNiCo permanent magnet rings need to use radiation magnetic field to induce precipitation phase under high temperature conditions. Radiation magnetic field heat treatment process is an important link in preparing high-performance AlNiCo radiation rings and improving the precision of magnetic devices. However, the existing technology lacks equipment and methods to solve the magnetic field heat treatment of AlNiCo permanent magnet rings under high temperature conditions. Summary of the Invention

[0007] The purpose of the present invention is to address the above-mentioned problems existing in the prior art and to propose a radiation magnetic field heat treatment device for a permanent magnet ring and a radiation magnetic field heat treatment method.

[0008] The object of the present invention can be achieved by the following technical solutions: A radiation magnetic field heat treatment device for a permanent magnet ring, comprising:

[0009] A heating unit, the heating unit comprising a housing and a heating element, wherein a working chamber is provided in the housing, and the heating element is installed in the working chamber and is used to generate a heat treatment environment in the working chamber;

[0010] A salient pole head for passing through the inner hole of the permanent magnet ring;

[0011] A concave pole head, wherein the concave pole head is provided with an accommodating hole for accommodating a permanent magnetic ring;

[0012] In which, the salient pole head and the concave pole head are both located in the working chamber and can be close to or far away from each other. In the working state, the salient pole head and the concave pole head are both magnetic and have opposite magnetic poles. When the salient pole head is close to the concave pole head, the salient pole head is inserted into the accommodating hole and an annular accommodating portion for accommodating a permanent magnet ring is formed between the circumferential surface of the salient pole head and the contour of the accommodating hole. The salient pole head and the concave pole head form a radial magnetic field in the annular accommodating portion through opposite magnetic poles.

[0013] Preferably, the permanent magnet ring is configured as an AlNiCo permanent magnet ring or an FeCrCo permanent magnet ring, and the permanent magnet ring utilizes the radial magnetic field to induce precipitation of radial precipitation phases in the heat treatment environment in the working chamber.

[0014] Preferably, the salient pole head is aligned with the accommodating hole, and a center line of the salient pole head is coaxially arranged with a center line of the accommodating hole.

[0015] Preferably, the end of the salient pole head close to the accommodating hole is set to a cone-like structure whose outer peripheral surface is formed by rotating an arc curve, the diameter of the salient pole head gradually increases along its own axial direction from the end close to the accommodating hole to the end away from the accommodating hole, and the end of the concave pole head close to the salient pole head is provided with an arc chamfer.

[0016] Preferably, the magnetic poles of the salient pole head and the concave pole head in a working state are respectively an N pole and an S pole or an S pole and an N pole.

[0017] Preferably, it further includes a first base and a second base, the salient pole head is detachably connected to the first base, the concave pole head is detachably connected to the second base, and the first base and the second base are both configured as electromagnetic components with adjustable magnetic field strength.

[0018] Preferably, both the salient pole head and the concave pole head are made of a material having both low thermal conductivity and high magnetic permeability.

[0019] Preferably, the top end of the salient pole head in a working state extends out from the inner hole of the permanent magnet ring.

[0020] A radiation magnetic field heat treatment method is also provided, comprising the radiation magnetic field heat treatment device for the permanent magnet ring, and further comprising the following steps:

[0021] S1: heating the working chamber, using a heating element to heat the working chamber to a set temperature to form a heat treatment environment in the working chamber;

[0022] S2: Sleeve the permanent magnet ring onto the salient pole head so that the inner hole wall of the permanent magnet ring is in close contact with the outer peripheral surface of the salient pole head. At this time, the top end of the salient pole head protrudes from the inner hole of the permanent magnet ring.

[0023] S3: The salient pole head and the concave pole head are brought close together so that the salient pole head is inserted into the receiving hole of the concave pole head. The contour of the permanent magnet ring on the salient pole head fits with the wall surface of the receiving hole, so that the permanent magnet ring is located in the annular receiving portion.

[0024] S4: The salient pole head and the concave pole head are connected in a magnetic circuit, and a radial magnetic field is formed in the annular accommodation portion through the opposite magnetic poles of the salient pole head and the concave pole head. At the same time, the permanent magnet ring is kept in the radial magnetic field and heat treatment environment for a certain period of time, thereby inducing the precipitation of radial precipitation phase in the permanent magnet ring;

[0025] S5: disconnecting the magnetic circuit, moving the salient pole head and the concave pole head away from each other, thereby separating the permanent magnet ring from the receiving hole;

[0026] S6: Tempering treatment of the permanent magnet ring. Remove the permanent magnet ring from the salient pole head, place it in a heat treatment furnace and keep it warm for a preset time, then cool it down to room temperature and take it out.

[0027] Preferably, the method further includes step S7: magnetizing the permanent magnet ring, using a radiation pulse device to perform radiation magnetization on the permanent magnet ring, and using a three-dimensional surface magnetometer to test the surface magnetic parameters of the permanent magnet ring.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] 1. The device can provide a high-temperature heat treatment environment and a radial magnetic field to meet the needs of heat treatment of permanent magnet rings in a radial magnetic field.

[0030] 2. Setting the salient pole head to a cone-like structure can make the magnetic field distribution more uniform and the magnetic field intensity stronger, thereby making the radial magnetic field more uniform and stronger, and the concave pole head is provided with an arc chamfer to avoid magnetic leakage during operation.

[0031] 3. Since the first base and the second base are electromagnetic components (electromagnets), the intensity of the radial magnetic field and the magnetic field holding time can be adjusted by controlling the current, which is convenient for adjustment during the radiation magnetic field heat treatment process to meet the requirements of heat treatment of the permanent magnet ring under different radiation magnetic field strength conditions.

[0032] 4. The center lines of the salient pole head and the concave pole head are coaxially arranged, which can realize the concentric placement of the permanent magnet ring and provide the requirements of uniform radiation magnetic field, thereby improving the uniformity of the surface magnetism of the permanent magnet ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the state when the salient pole head and the concave pole head of the present invention are close to each other.

[0034] Figure 2 It is a schematic diagram of the state when the salient pole head and the concave pole head are away from each other according to the present invention.

[0035] Figure 3 This is a schematic diagram of the heat treatment of the permanent magnet ring of the present invention in a radial magnetic field.

[0036] Figure 4 It is a schematic diagram of the salient pole head of the present invention forming a radial magnetic field in the receiving hole.

[0037] Figure 5 It is a structural schematic diagram of the magnetized state of the permanent magnet ring of the present invention.

[0038] Figure 6 This is a schematic structural diagram of the magnetized state of comparative example 1.

[0039] Figure 7 Schematic diagram of the structure of the magnetized state of comparative example 2.

[0040] In the figure, 100, shell; 110, heating element; 120, working chamber; 200, first base; 210, salient pole head; 211, top end; 300, second base; 310, concave pole head; 311, receiving hole; 400, permanent magnet ring; 500, annular receiving portion. DETAILED DESCRIPTION

[0041] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solutions of the present invention, but the present invention is not limited to these embodiments.

[0042] Example 1:

[0043] like Figure 1-5 As shown, a radiation magnetic field heat treatment device for a permanent magnet ring includes: a heating unit, a salient pole head 210 and a concave pole head 310, the heating unit includes a shell 100 and a heating element 110, a working chamber 120 is provided in the shell 100, the heating element 110 is installed in the working chamber 120 and is used to generate a heat treatment environment in the working chamber 120; the salient pole head 210 is used to pass through the inner hole of the permanent magnet ring 400; the concave pole head 310 is provided with a receiving hole 311 for receiving the permanent magnet ring 400; wherein the salient pole head 210 and the concave pole head 310 are provided with a receiving hole 311 for receiving the permanent magnet ring 400; The heads 310 are both located in the working chamber 120 and the two can be close to or far away from each other. In the working state, the salient pole head 210 and the concave pole head 310 are both magnetic and their magnetic poles are opposite; when the salient pole head 210 is close to the concave pole head 310, the salient pole head 210 is inserted into the accommodating hole 311 and the circumferential surface of the salient pole head 210 and the contour of the accommodating hole 311 form an annular accommodating portion 500 for accommodating the permanent magnet ring 400. The salient pole head 210 and the concave pole head 310 form a radial magnetic field in the annular accommodating portion 500 through opposite magnetic poles.

[0044] In this embodiment, the salient pole head 210 and the concave pole head 310 can approach or move away from each other. When the salient pole head 210 and the concave pole head 310 are close to each other, the permanent magnet ring 400 can be fixed in the annular accommodating portion 500. When the salient pole head 210 and the concave pole head 310 are moved away from each other, the permanent magnet ring 400 that has been heat-treated can be taken out. The heating element 110 is preferably based on a principle that can achieve a heating effect, such as an electric heating tube. The heating element 110 can generate high temperature in the working chamber 120 to form a heat treatment environment.

[0045] During the heat treatment of the permanent magnet ring 400, the salient pole head 210 can be inserted into the inner hole of the permanent magnet ring 400 until the salient pole head 210 is tightly fitted with the inner hole of the permanent magnet ring 400, and the permanent magnet ring 400 is located in the receiving hole 311. The outline of the permanent magnet ring 400 is tightly fitted with the receiving hole 311. The permanent magnet ring 400 is confined to the annular receiving portion 500. More specifically, the salient pole head 210 is inserted into the inner hole of the permanent magnet ring 400, and the concave pole head 310 surrounds the permanent magnet ring 400. 00, so at this time the salient pole head 210 and the concave pole head 310 form an internal and external corresponding arrangement. Since the magnetic poles of the salient pole head 210 and the concave pole head 310 are opposite in the working state, a radial magnetic field can be formed passing through the annular accommodating portion 500. In the high-temperature heat treatment environment in the working chamber 120, the permanent magnet ring 400 can be heat treated in the radial magnetic field, and induce the precipitation of radial precipitation phases, thereby improving the radial surface magnetism and radial surface magnetic uniformity of the permanent magnet ring 400.

[0046] The device can provide a high-temperature heat treatment environment and a radial magnetic field to meet the needs of heat treatment of the permanent magnet ring 400 in a radial magnetic field. The permanent magnet ring 400 performs radiation magnetic field heat treatment in a radial magnetic field, which can improve the radiation surface magnetism and radiation surface magnetism uniformity of the permanent magnet ring 400.

[0047] In this embodiment, the salient pole head 210 and the concave pole head 310 in the working state are both magnetic and have opposite magnetic poles. Specifically, the magnetic poles of the salient pole head 210 and the concave pole head 310 are N pole and S pole or S pole and N pole respectively.

[0048] Example 2:

[0049] like Figure 1-5 As shown, this embodiment defines the permanent magnet ring 400 on the basis of the first embodiment, and the permanent magnet ring 400 is set as an aluminum nickel cobalt permanent magnet ring 400 or an iron chromium cobalt permanent magnet ring 400, and the permanent magnet ring 400 uses the radial magnetic field to induce the precipitation of radial precipitation phase in the heat treatment environment in the working chamber 120.

[0050] Example 3:

[0051] like Figure 1-4 As shown, this embodiment refines the positional relationship between the salient pole head 210 and the concave pole head 310 on the basis of the first embodiment. The salient pole head 210 is aligned with the accommodating hole 311 , and the center line of the salient pole head 210 is coaxially arranged with the center line of the accommodating hole 311 .

[0052] In this embodiment, the salient pole head 210 and the concave pole head 310 can move along the axial direction of the central axis, thereby approaching or moving away from each other.

[0053] The center lines of the salient pole head 210 and the concave pole head 310 are coaxially arranged, which can realize the requirements of concentric placement of the permanent magnet ring 400 and provide a uniform radiated magnetic field, thereby improving the uniformity of the surface magnetism of the permanent magnet ring 400.

[0054] Example 4:

[0055] like Figure 1-3 As shown, this embodiment refines the shapes of the salient pole head 210 and the concave pole head 310 on the basis of the first embodiment. The end of the salient pole head 210 close to the accommodating hole 311 is set as a cone-like structure with an outer peripheral surface rotated by an arc curve. The diameter of the salient pole head 210 gradually increases along its own axial direction from the end close to the accommodating hole 311 to the end away from the accommodating hole 311, and the end of the concave pole head 310 close to the salient pole head 210 is provided with an arc chamfer.

[0056] The salient pole head 210 is not a standard conical structure, but a cone-like structure whose outer circumference is formed by rotating an arc curve. The outer circumference of the salient pole head 210 is formed by rotating an arc curve. The shape of the arc circumference of the salient pole head 210 can make the magnetic field distribution more uniform and the magnetic field intensity stronger, thereby making the radial magnetic field more uniform and stronger, so the radial precipitation phase induced by the radial magnetic field is more uniform.

[0057] An arc-shaped chamfer is provided at one end of the concave pole head 310 close to the salient pole head 210 , so that the end of the concave pole head is smoother, thereby preventing magnetic leakage during operation of the concave pole head 310 .

[0058] Preferably, in a working state, the top end portion 211 of the salient pole head 210 extends from the inner hole of the permanent magnet ring 400 .

[0059] It should be noted that the diameter of the top portion 211 is slightly smaller than the inner hole diameter of the permanent magnet ring 400 . When the permanent magnet ring 400 is mounted on the salient pole head 210 , the top portion 211 extends from the inner hole of the permanent magnet ring 400 .

[0060] Embodiment 5:

[0061] like Figure 1-3 As shown, it also includes a first base 200 and a second base 300. The salient pole head 210 is detachably connected to the first base 200, and the concave pole head 310 is detachably connected to the second base 300. The first base 200 and the second base 300 are both configured as electromagnetic components with adjustable magnetic field strength.

[0062] Since the first base 200 and the second base 300 are electromagnetic components and electromagnets, the intensity of the radiating magnetic field and the magnetic field retention time can be adjusted by controlling the current size, which is convenient for adjustment during the radiation magnetic field heat treatment process to meet the requirements of heat treatment of the permanent magnet ring 400 under different radiation magnetic field strength conditions.

[0063] Preferably, the salient pole head 210 and the concave pole head 310 are both made of a material having both low thermal conductivity and high magnetic permeability, for example, the salient pole head 210 and the concave pole head 310 can be made of an iron-cobalt-vanadium alloy or an iron-cobalt alloy or pure iron.

[0064] It should also be added that the housing 100 can be made of a material that has both high temperature resistance and heat preservation properties, such as mullite or boron nitride.

[0065] like Figure 1-5 As shown, a radiation magnetic field heat treatment method is also provided, including the radiation magnetic field heat treatment device of the permanent magnet ring, and further comprising the following steps:

[0066] S1: heating the working chamber, using a heating element to heat the working chamber to a set temperature to form a heat treatment environment in the working chamber;

[0067] S2: Sleeve the permanent magnet ring onto the salient pole head so that the inner hole wall of the permanent magnet ring is in close contact with the outer peripheral surface of the salient pole head. At this time, the top end of the salient pole head protrudes from the inner hole of the permanent magnet ring.

[0068] S3: The salient pole head and the concave pole head are brought close together so that the salient pole head is inserted into the receiving hole of the concave pole head. The contour of the permanent magnet ring on the salient pole head fits with the wall surface of the receiving hole, so that the permanent magnet ring is located in the annular receiving portion.

[0069] S4: The salient pole head and the concave pole head are connected in a magnetic circuit, and a radial magnetic field is formed in the annular accommodation portion through the opposite magnetic poles of the salient pole head and the concave pole head. At the same time, the permanent magnet ring is kept in the radial magnetic field and heat treatment environment for a certain period of time, thereby inducing the precipitation of radial precipitation phase in the permanent magnet ring;

[0070] S5: disconnecting the magnetic circuit, moving the salient pole head and the concave pole head away from each other, thereby separating the permanent magnet ring from the receiving hole;

[0071] S6: Tempering treatment of the permanent magnet ring. Remove the permanent magnet ring from the salient pole head, place it in a heat treatment furnace and keep it warm for a preset time, then cool it down to room temperature and take it out.

[0072] Preferably, the temperature of the above-mentioned heat treatment environment is 550℃-600℃; in step S4, the magnetic field strength of the radial magnetic field is ≥2000Oe, and the holding time is ≥10min; in step S6, the tempering process of the permanent magnet ring 400 is 600-630℃ for 3-5h, or 570-600℃ for 6-9h, or 540-570℃ for 9-16h.

[0073] The invention also provides a radiation magnetization step, which includes step S7: magnetizing the permanent magnet ring 400, using a radiation pulse device to perform radiation magnetization on the permanent magnet ring 400, and using a three-dimensional surface magnetometer to test the surface magnetic parameters of the permanent magnet ring 400.

[0074] In step S7, the magnetizing voltage of the radiation pulse device is adjusted to 1000V, the permanent magnet ring 400 is subjected to radiation magnetization by the radiation pulse device, and the surface magnetic parameters of the permanent magnet ring 400 in the radiation magnetization direction are tested using a three-dimensional surface magnetometer.

[0075] Example 6:

[0076] This embodiment is a specific implementation of the radiation magnetic field heat treatment method. The permanent magnet ring 400 selected in this embodiment is an AlNiCo 5 material, and the ingot is an isotropic ingot. The ingot is processed into a permanent magnet ring 400 with a diameter of 20 mm*10 mm*8 mm. The permanent magnet ring 400 is kept at 1260°C for 10 minutes and then cooled by air at a rate of 8°C / s. The first base 200 and the second base 300 are both made of iron, cobalt and vanadium. The shell 100 is made of mullite. The radiation magnetic field heat treatment method of the AlNiCo permanent magnet ring 400 includes the following steps:

[0077] 1. Heat the working chamber 120 to 600° C.

[0078] 2. Cool the AlNiCo permanent magnet ring from 400°C to 800°C;

[0079] 3. Place the 800°C AlNiCo permanent magnet ring 400 on the salient pole head 210 of the first base 200, ensuring that one end of the permanent magnet ring 400 is in close contact with the salient pole head 210 of the first base 200, and the top end 211 just comes out from the other end of the permanent magnet ring 400;

[0080] 4. Quickly move the first base 200 toward the second base 300 to ensure that the receiving hole 311 just covers the AlNiCo permanent magnet ring 400;

[0081] 5. Connect the magnetic circuit and adjust the magnetic field strength to 2000 Oe and maintain it for 13 minutes;

[0082] 6. Disconnect the magnetic circuit and move the first base 200 in the opposite direction to ensure that the AlNiCo permanent magnet ring 400 is completely exposed from the second base 300;

[0083] 7. Remove the AlNiCo permanent magnet ring 400 from the salient pole head 210, place it in a heat treatment chamber and keep it warm for a period of time, then cool it down to room temperature with the furnace. The holding process parameters are 630℃*3h, 600℃*6h, and 570℃*9h.

[0084] 8. Use a surface grinder and an internal and external cylindrical grinder to process the permanent magnet ring 400 into a permanent magnet ring 400 with a size of Ф18mm*Ф12mm*6mm;

[0085] 9. Adjust the magnetizing voltage of the radiation pulse equipment to 1000V, use the radiation pulse equipment to perform radiation magnetization on the AlNiCo permanent magnet ring 400, and use a three-dimensional surface magnetometer to test the surface magnetic parameters of the radiation magnetization direction of the AlNiCo permanent magnet ring 400. The above-mentioned radiation magnetic field heat treatment device is easy to operate, and the radiation magnetic field heat treatment method is simple, which can realize radial heat treatment of the permanent magnet ring 400. After magnetization, the maximum value of the radiation direction surface magnetism of the permanent magnet ring 400 is 175mT, the minimum value is 134mT, and the difference is 41mT.

[0086] Embodiment seven:

[0087] This embodiment is a specific implementation of the radiation magnetic field heat treatment method. The permanent magnet ring 400 selected in this embodiment is an AlNiCo 5 material, and the ingot is an isotropic ingot. The ingot is processed into a permanent magnet ring 400 with a diameter of 20 mm*10 mm*8 mm. The permanent magnet ring 400 is kept at 1260°C for 10 minutes and then cooled by air at a rate of 8°C / s. The first base 200 and the second base 300 are both made of iron, cobalt and vanadium. The shell 100 is made of mullite. The radiation magnetic field heat treatment method of the AlNiCo permanent magnet ring 400 includes the following steps:

[0088] 1. Heat the working chamber 120 to 550° C.

[0089] 2. Cool the AlNiCo permanent magnet ring 400 to 810°C;

[0090] 3. Place the 810°C AlNiCo permanent magnet ring 400 onto the salient pole head 210 of the first base 200, ensuring that one end of the permanent magnet ring 400 is in close contact with the salient pole head 210 of the first base 200, and the top end 211 just comes out of the other end of the permanent magnet ring 400;

[0091] 4. Quickly move the first base 200 toward the second base 300 to ensure that the receiving hole 311 just covers the AlNiCo permanent magnet ring 400;

[0092] 5. Connect the magnetic circuit and adjust the magnetic field strength to 3500Oe and maintain it for 12 minutes;

[0093] 6. Disconnect the magnetic circuit and move the first base 200 in the opposite direction to ensure that the AlNiCo permanent magnet ring 400 is completely exposed from the second base 300;

[0094] 7. Remove the AlNiCo permanent magnet ring 400 from the salient pole head 210, place it in a heat treatment chamber and keep it warm for a period of time, then cool it to room temperature with the furnace. The holding process parameters are 620℃*4h, 580℃*6h, and 560℃*12h.

[0095] 8. Use a surface grinder and an internal and external cylindrical grinder to process the permanent magnet ring 400 into a permanent magnet ring 400 with a size of Ф18mm*Ф12mm*6mm;

[0096] 9. Adjust the magnetizing voltage of the radiation pulse device to 1000V, use the radiation pulse device to perform radiation magnetization on the aluminum nickel cobalt permanent magnet ring 400, and use a three-dimensional surface magnetometer to test the surface magnetic parameters of the radiation magnetization direction of the aluminum nickel cobalt permanent magnet ring 400. The above-mentioned radiation magnetic field heat treatment device is easy to operate, and the radiation magnetic field heat treatment method is simple, which can realize radial heat treatment of the permanent magnet ring 400. After magnetization, the maximum value of the surface magnetism in the radiation direction of the permanent magnet ring 400 is 192mT, the minimum value is 160mT, and the difference is 32mT. Compared with Example 6, the surface magnetism increases from 134-175mT to 160-192mT, and the surface magnetism difference decreases from 41mT to 32mT, indicating that optimizing the radiation magnetic field heat treatment process can improve the surface magnetism and reduce the surface magnetism volatility.

[0097] Embodiment 8:

[0098] This embodiment is a specific implementation of the radiation magnetic field heat treatment method. The permanent magnet ring 400 selected in this embodiment is an AlNiCo 5 material, and the ingot is an isotropic ingot. The ingot is processed into a permanent magnet ring 400 with a diameter of 20 mm*10 mm*8 mm. The permanent magnet ring 400 is kept at 1260°C for 10 minutes and then cooled by air at a rate of 8°C / s. The first base 200 and the second base 300 are both made of iron, cobalt and vanadium. The shell 100 is made of mullite. The radiation magnetic field heat treatment method of the AlNiCo permanent magnet ring 400 includes the following steps:

[0099] 1. Heat the working chamber 120 to 550° C.

[0100] 2. Cool the AlNiCo permanent magnet ring 400 to 820°C;

[0101] 3. Place the 820°C AlNiCo permanent magnet ring 400 onto the salient pole head 210 of the first base 200, ensuring that one end of the permanent magnet ring 400 is in close contact with the salient pole head 210 of the first base 200 and the top end 211 just comes out of the other end of the permanent magnet ring 400;

[0102] 4. Quickly move the first base 200 toward the second base 300 to ensure that the receiving hole 311 just covers the AlNiCo permanent magnet ring 400;

[0103] 5. Connect the magnetic circuit and adjust the magnetic field strength to 3500Oe and maintain it for 12 minutes;

[0104] 6. Disconnect the magnetic circuit and move the first base 200 in the opposite direction to ensure that the AlNiCo permanent magnet ring 400 is completely exposed from the second base 300;

[0105] 7. Remove the AlNiCo permanent magnet ring 400 from the salient pole head 210, place it in a heat treatment chamber and keep it warm for a period of time, then cool it down to room temperature with the furnace. The holding process parameters are 610℃*3h, 570℃*7h, and 550℃*16h.

[0106] 8. Use a surface grinder and an internal and external cylindrical grinder to process the permanent magnet ring 400 into a permanent magnet ring 400 with a size of Ф18mm*Ф12mm*6mm;

[0107] 9. Adjust the magnetizing voltage of the radiation pulse equipment to 1000V, use the radiation pulse equipment to perform radiation magnetization on the AlNiCo permanent magnet ring 400, and use a three-dimensional surface magnetometer to test the surface magnetic parameters of the radiation magnetization direction of the AlNiCo permanent magnet ring 400. The above-mentioned radiation magnetic field heat treatment device is easy to operate, and the radiation magnetic field heat treatment method is simple, which can realize radial heat treatment of the permanent magnet ring 400. After magnetization, the maximum value of the radiation direction surface magnetism of the permanent magnet ring 400 is 175mT, the minimum value is 134mT, and the difference is 41mT. The above-mentioned radiation magnetic field heat treatment device is easy to operate, and the radiation magnetic field heat treatment method is simple, and can realize radial heat treatment of the permanent magnet ring 400. After magnetization, the maximum value of the surface magnetism of the permanent magnet ring 400 in the radiation direction is 220mT, the minimum value is 202mT, and the difference is 18mT. Compared with Example 6 and Example 7, the surface magnetism increases from 134-175mT to 202-220mT, and the surface magnetism difference decreases from 41mT to 18mT, indicating that optimizing the radiation magnetic field heat treatment process can improve the surface magnetism and reduce the volatility of the surface magnetism.

[0108] Embodiment 9:

[0109] This embodiment is a specific implementation of the radiation magnetic field heat treatment method. The permanent magnet ring 400 selected in this embodiment is an AlNiCo 5 material, and the ingot is an isotropic ingot. The ingot is processed into a permanent magnet ring 400 with a diameter of 20 mm*10 mm*8 mm. The permanent magnet ring 400 is kept at 1260°C for 10 minutes and then cooled by air at a rate of 8°C / s. The first base 200 and the second base 300 are both made of iron, cobalt and vanadium. The shell 100 is made of mullite. The radiation magnetic field heat treatment method of the AlNiCo permanent magnet ring 400 includes the following steps:

[0110] 1. Heat the working chamber 120 to 500° C.

[0111] 2. Cool the AlNiCo permanent magnet ring 400 to 830°C;

[0112] 3. Place the 830°C AlNiCo permanent magnet ring 400 onto the salient pole head 210 of the first base 200, ensuring that one end of the permanent magnet ring 400 is in close contact with the salient pole head 210 of the first base 200 and the top end 211 just comes out of the other end of the permanent magnet ring 400;

[0113] 4. Quickly move the first base 200 toward the second base 300 to ensure that the receiving hole 311 just covers the AlNiCo permanent magnet ring 400;

[0114] 5. Connect the magnetic circuit and adjust the magnetic field strength to 4000Oe and maintain it for 10 minutes;

[0115] 6. Disconnect the magnetic circuit and move the first base 200 in the opposite direction to ensure that the AlNiCo permanent magnet ring 400 is completely exposed from the second base 300;

[0116] 7. Remove the AlNiCo permanent magnet ring 400 from the salient pole head 210, place it in a heat treatment chamber and keep it warm for a period of time, then cool it to room temperature with the furnace. The holding process parameters are 600°C*5h, 570°C*9h, and 540°C*16h.

[0117] 8. Use a surface grinder and an internal and external cylindrical grinder to process the permanent magnet ring 400 into a permanent magnet ring 400 with a size of Ф18mm*Ф12mm*6mm;

[0118] 9. Adjust the magnetizing voltage of the radiation pulse equipment to 1000V, use the radiation pulse equipment to perform radiation magnetization on the aluminum nickel cobalt permanent magnet ring 400, and use a three-dimensional surface magnetometer to test the surface magnetic parameters of the radiation magnetization direction of the aluminum nickel cobalt permanent magnet ring 400. The above-mentioned radiation magnetic field heat treatment device is easy to operate, and the radiation magnetic field heat treatment method is simple, which can realize radial heat treatment of the permanent magnet ring 400. After magnetization, the maximum value of the surface magnetism in the radiation direction of the permanent magnet ring 400 is 201mT, the minimum value is 173mT, and the difference is 28mT. Compared with Example 6 and Example 7, the surface magnetism increases from 134-175mT to 173-201mT, and the surface magnetism difference decreases from 41mT to 28mT. Compared with Example 8, the surface magnetism decreases from 202-220mT to 173-201mT, and the surface magnetism difference increases from 18mT to 28mT, indicating that the radiation magnetic field heat treatment process of Example 8 is the best.

[0119] Comparative Example 1:

[0120] like Figure 6 As shown, the permanent magnet ring selected in Comparative Example 1 is made of AlNiCo 5 material, the ingot is an isotropic ingot, four 90° magnetic tiles are cut from the ingot, the size of the magnetic tiles is R10mm*R5mm*8mm, the magnetic tiles are kept at 1260°C for 10 minutes, and then cooled by air at a rate of 8°C / s. The heat treatment method for the AlNiCo permanent magnet ring radiating a magnetic field includes the following steps:

[0121] 1. Heat the working chamber to 550°C;

[0122] 2. Cool the magnetic tile to 820℃;

[0123] 3. Heat treat the magnetic tile under the action of the magnetic field and keep it warm for 12 minutes to ensure that the radial direction of the magnetic tile is parallel to the horizontal field direction and the horizontal magnetic field intensity is 3500Oe;

[0124] 4. Disconnect the magnetic circuit and remove the magnetic tile;

[0125] 5. Place the product in the heat treatment chamber and keep it warm for a period of time, then cool it down to room temperature with the furnace. The heat preservation process parameters are 610℃*3h, 570℃*7h, and 550℃*16h.

[0126] 6. Use a demagnetization machine to demagnetize the magnetic tiles, and use a surface grinder and internal and external cylindrical grinder to remove the surface oxide scale of the magnetic tiles;

[0127] 7. Use curing glue to bond the four magnetic tiles into a spliced ​​permanent magnet ring, and use a surface grinder and an internal and external cylindrical grinder to process the permanent magnet ring into a permanent magnet ring with a size of Ф18mm*Ф12mm*6mm;

[0128] 8. Adjust the magnetizing voltage of the radiation pulse equipment to 1000V, use the radiation pulse equipment to perform radiation magnetization on the AlNiCo permanent magnet ring, and use a three-dimensional surface magnetometer to test the surface magnetic parameters of the AlNiCo permanent magnet ring in the radiation magnetization direction. The surface magnetic value in the radiation field direction is 145-188mT, and the surface magnetic difference is 43mT. Compared with Example 8, it can be seen that the surface magnetism of the spliced ​​permanent magnet ring is low, the surface magnetic volatility is high, and the bonding process is complicated and the placement position of the magnetic tiles is not easy to control, resulting in large surface magnetic volatility.

[0129] Comparative Example 2:

[0130] like Figure 7 As shown, the permanent magnet ring selected in Comparative Example 2 is made of AlNiCo 5 material, the ingot is an isotropic ingot, 16 22.5° magnetic tiles are cut from the ingot, the size of the magnetic tiles is R10mm*R5mm*8mm, the magnetic tiles are kept at 1260°C for 10 minutes, and then cooled by air at a rate of 8°C / s. The heat treatment method for the radiation magnetic field of the AlNiCo permanent magnet ring includes the following steps:

[0131] 1. Heat the working chamber to 550°C;

[0132] 2. Cool the magnetic tile to 820℃;

[0133] 3. Heat treat the magnetic tile under the action of the magnetic field and keep it warm for 12 minutes to ensure that the radial direction of the magnetic tile is parallel to the horizontal field direction and the horizontal magnetic field intensity is 3500Oe;

[0134] 4. Disconnect the magnetic circuit and remove the magnetic tile;

[0135] 5. Keep the magnetic tile in the heat treatment chamber for a period of time and then cool it to room temperature with the furnace. The heat preservation process parameters are 610℃*3h, 570℃*7h, and 550℃*16h.

[0136] 6. Use a demagnetization machine to demagnetize the magnetic tiles, and use a surface grinder and internal and external cylindrical grinder to remove the surface oxide scale of the magnetic tiles;

[0137] 7. Use curing glue to bond 16 magnetic tiles into a spliced ​​permanent magnet ring, and use a surface grinder and an internal and external cylindrical grinder to process the permanent magnet ring into a permanent magnet ring with a size of Ф18mm*Ф12mm*6mm;

[0138] 8. The radiation pulse device magnetizing voltage was adjusted to 1000V, and the radiation pulse device was used to perform radiation magnetization on the AlNiCo permanent magnet ring. A three-dimensional surface magnetometer was used to test the AlNiCo permanent magnet ring's surface magnetic parameters in the radiation magnetization direction. The surface magnetic values ​​in the radiation field direction were 164-192mT, and the surface magnetic difference was 28mT. Compared with Comparative Example 6, the surface magnetic field increased from 145-188mT to 164-192mT, and the surface magnetic difference decreased from 43mT to 28mT, indicating that increasing the number of magnetic tiles can increase the surface magnetic field of the permanent magnet ring and reduce the surface magnetic fluctuation. Compared with Example 8, the surface magnetic field was lower and the surface magnetic fluctuation was poorer. At the same time, the bonding process was more complicated and difficult to operate.

[0139] It should be noted that all directional indications such as up, down, left, right, front, back, etc. in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components in a certain specific posture as shown in the accompanying drawings. If the specific posture changes, the directional indication will also change accordingly.

[0140] In addition, in the present invention, descriptions such as "first," "second," and "one" are for descriptive purposes only and should not be understood to indicate or imply their relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0141] In the present invention, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will be able to understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0142] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in this field can implement it. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0143] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope of the appended claims.

Claims

1. A radiation magnetic field heat treatment device for a permanent magnet ring, characterized in that: include: A heating unit, comprising a housing (100) and a heating element (110), wherein a working chamber (120) is provided in the housing (100), and the heating element (110) is installed in the working chamber (120) and is used to generate a heat treatment environment in the working chamber (120); A salient pole head (210) for passing through the inner hole of the permanent magnet ring (400); A concave pole head (310), wherein the concave pole head (310) is provided with an accommodating hole (311) for accommodating a permanent magnet ring (400); The salient pole head (210) and the concave pole head (310) are both located in the working chamber (120) and can be moved closer to or farther away from each other. In a working state, the salient pole head (210) and the concave pole head (310) are both magnetic and have opposite magnetic poles. When the salient pole head (210) is close to the concave pole head (310), the salient pole head (210) is inserted into the accommodating hole (311), and an annular accommodating portion (500) for accommodating a permanent magnet ring (400) is formed between the circumference of the salient pole head (210) and the contour of the accommodating hole (311). The salient pole head (210) and the concave pole head (310) form a radial magnetic field in the annular accommodating portion (500) through opposite magnetic poles. The salient pole head (210) is aligned with the accommodating hole (311), and a center line of the salient pole head (210) is coaxially arranged with a center line of the accommodating hole (311); The magnetic poles of the salient pole head (210) and the concave pole head (310) in a working state are respectively an N pole and an S pole or an S pole and an N pole; The invention also includes a first base (200) and a second base (300), wherein the salient pole head (210) is detachably connected to the first base (200), and the concave pole head (310) is detachably connected to the second base (300), and the first base (200) and the second base (300) are both configured as electromagnetic components capable of adjusting the magnetic field strength.

2. A radiation magnetic field heat treatment device for a permanent magnet ring as claimed in claim 1, characterized in that: The permanent magnet ring (400) is configured as an aluminum nickel cobalt permanent magnet ring (400) or an iron chromium cobalt permanent magnet ring (400), and the permanent magnet ring (400) utilizes the radial magnetic field to induce precipitation of a radial precipitation phase in a heat treatment environment within the working chamber (120).

3. The radiation magnetic field heat treatment device for a permanent magnet ring as claimed in claim 1, characterized in that: The end of the salient pole head (210) close to the accommodating hole (311) is configured as a pyramidal structure whose outer peripheral surface is formed by rotating an arc curve; the diameter of the salient pole head (210) gradually increases along its own axial direction from the end close to the accommodating hole (311) to the end away from the accommodating hole (311); and the end of the concave pole head (310) close to the salient pole head (210) is configured with an arc chamfer.

4. The radiation magnetic field heat treatment device for a permanent magnet ring as claimed in claim 1, characterized in that: The salient pole head (210) and the concave pole head (310) are both made of a material having both low thermal conductivity and high magnetic permeability.

5. A radiation magnetic field heat treatment device for a permanent magnet ring as claimed in claim 1 or 3, characterized in that: In a working state, the top end portion (211) of the salient pole head (210) extends from the inner hole of the permanent magnet ring (400).

6. A radiation magnetic field heat treatment method, characterized in that: The radiation magnetic field heat treatment device comprising the permanent magnet ring according to any one of claims 1 to 5 further comprises the following steps: S1: heating the working chamber (120), using the heating element (110) to heat the working chamber (120) to a set temperature, thereby forming a heat treatment environment in the working chamber (120); S2: The permanent magnetic ring (400) is sleeved onto the salient pole head (210), so that the inner hole wall surface of the permanent magnetic ring (400) is in close contact with the outer peripheral surface of the salient pole head (210), and the top end portion (211) of the salient pole head (210) protrudes from the inner hole of the permanent magnetic ring (400); S3: The salient pole head (210) and the concave pole head (310) are brought close to each other so that the salient pole head (210) is inserted into the receiving hole (311) of the concave pole head (310), and the contour of the permanent magnet ring (400) on the salient pole head (210) is fitted with the wall surface of the receiving hole (311), so that the permanent magnet ring (400) is located in the annular receiving portion (500); S4: The salient pole head (210) and the concave pole head (310) are connected to the magnetic circuit, and a radial magnetic field is formed in the annular accommodation portion (500) through the opposite magnetic poles of the salient pole head (210) and the concave pole head (310), and the permanent magnet ring (400) is kept warm for a certain period of time in the radial magnetic field and the heat treatment environment, thereby inducing the permanent magnet ring (400) to precipitate a radial precipitation phase; S5: disconnecting the magnetic circuit, moving the salient pole head (210) away from the concave pole head (310), thereby separating the permanent magnetic ring (400) from the receiving hole (311); S6: Tempering treatment of the permanent magnetic ring (400), removing the permanent magnetic ring (400) from the salient pole head (210), placing it in a heat treatment furnace for a preset time, and then cooling it to room temperature and taking it out.

7. A radiation magnetic field heat treatment method as claimed in claim 6, characterized in that: The method further comprises step S7: magnetizing the permanent magnetic ring (400), using a radiation pulse device to perform radiation magnetization on the permanent magnetic ring (400), and using a three-dimensional surface magnetometer to test the surface magnetic parameters of the permanent magnetic ring (400).

Images