Axial flux motor magnetic steel partition grain boundary diffusion system and control method

Abstract

The application discloses an axial flux motor magnetic steel partition grain boundary diffusion system and a control method, and relates to the technical field of permanent magnet material processing. The method obtains the surface profile of the magnetic steel, the installation orientation and the anti-demagnetization requirement of each surface position, establishes the magnetic steel orientation requirement information, divides the grain boundary diffusion partition according to the anti-demagnetization requirement, determines the partition boundary and the unit area supply amount, sequentially isolates the supply of each grain boundary diffusion partition after positioning the magnetic steel, verifies the diffusion source coverage boundary and the coverage continuous state, removes the out-of-bound diffusion source and compensates the supply of the uncovered area, and then performs the grain boundary diffusion heat treatment while maintaining the partition orientation, so as to obtain the partition grain boundary diffusion magnetic steel. The application can improve the corresponding accuracy of the diffusion partition and the local anti-demagnetization requirement and the consistency of the partition coating.

Description

Technical Field

[0001] This invention relates to the field of permanent magnet material processing technology, specifically to an axial flux motor magnet partitioning grain boundary diffusion system and control method. Background Technology

[0002] Axial flux motors typically employ a disc-shaped rotor with multiple permanent magnets arranged circumferentially on it. During motor operation, the magnets are subjected to the combined effects of operating temperature and the armature's reverse magnetic field. The strength of the reverse magnetic field varies at different locations on the same magnet, easily creating regions with varying demagnetization resistance. To maintain the magnetic properties of the magnets under high temperature and reverse magnetic field conditions, current technology typically employs grain boundary diffusion treatment. This involves placing a diffusion source containing dysprosium or terbium on the surface of the neodymium iron boron magnet, followed by heat treatment to allow the diffusion elements to penetrate the magnet's interior along the grain boundaries, thereby improving the magnet's coercivity and demagnetization resistance.

[0003] Patent CN102859621A discloses a coating apparatus for grain boundary diffusion treatment, which coats a diffusion material onto the surface of a magnet using a grid with a predetermined transmission pattern. While this method can form a predetermined coating pattern, the pattern is primarily defined by the grid and does not establish a continuous data correspondence between the axial flux motor operating conditions, the magnet installation orientation, local anti-demagnetization requirements, the actual workpiece position, and the material supply results.

[0004] For example, patent CN111653407A discloses a gradient-distributed neodymium iron boron magnet and its preparation method, which sets different amounts of heavy rare earth diffusion materials in each region according to the demagnetization risk of different regions of the magnet. This scheme can form a differentiated magnetic property distribution, but it still lacks a complete closed loop for the orientation consistency of fan-shaped or trapezoidal magnets before and after material feeding, the correspondence between the partition boundary and the actual magnet surface, the verification of the coverage status, and the feedback of the verification results to the original partition material feeding rules.

[0005] Therefore, the key technical problem that the existing technology needs to solve is: how to use the same magnet's orientation reference and workpiece association information to integrate the acquisition of anti-demagnetization requirements, partition generation, positioning correspondence, isolated feeding, coverage verification, correction feedback and grain boundary diffusion heat treatment without relying on the internal mechanical structure of each actuator, so that the feeding position and feeding degree of each grain boundary diffusion partition are consistent with the local anti-demagnetization requirements. Summary of the Invention

[0006] To address the shortcomings of existing technologies, the technical problem this invention aims to solve is to provide a grain boundary diffusion system and control method for axial flux motor magnet partitioning. This system establishes a unified data association between magnet orientation requirements and partition diffusion control information, ensuring that anti-demagnetization requirements, partition boundaries, and material supply per unit area correspond to the same magnet and the same installation orientation. Through positioning status verification, isolated material supply, coverage verification, and correction feedback, over-covered and uncovered areas are returned to their respective grain boundary diffusion partitions for processing. After successful coverage, grain boundary diffusion heat treatment is performed while maintaining the partition orientation, thus forming a closed-loop system control system for the magnet partitioning grain boundary diffusion process. To solve the above technical problems, this invention provides the following technical solution: The first aspect of this application relates to a control method for an axial flux motor magnet partitioned grain boundary diffusion system, comprising: Step S1: Obtain the surface contour, installation orientation, and anti-demagnetization requirements of each surface position of the magnet. Determine the inner circumferential side, outer circumferential side, and circumferential side based on the installation orientation, and associate each surface position with the anti-demagnetization requirements to obtain the magnet orientation requirement information. Step S2: Based on the magnetic steel orientation requirement information, divide the grain boundary diffusion zones according to the anti-demagnetization requirement, determine the zone boundary and unit area material supply of each grain boundary diffusion zone, and obtain the zone diffusion control information. Step S3: Align the inner circumferential side, outer circumferential side, and circumferential side with the positioning reference, and define the position and orientation of the magnet to obtain the positioning magnet corresponding to the orientation of the partition diffusion control information; Step S4: According to the partitioned diffusion control information, the diffusion partitions of the positioning magnet are sequentially isolated and fed with materials so that the diffusion source is attached according to the corresponding unit area material supply amount, thereby obtaining the partitioned coated magnet. Step S5: Verify the coverage boundary and coverage continuity of the partitioned coated magnets, remove the cross-boundary diffusion sources, and compensate for the uncovered areas by feeding materials to obtain qualified partitioned coated magnets. Step S6: Maintain the orientation of the qualified partitioned coated magnet and perform grain boundary diffusion heat treatment to allow the diffusion source to diffuse inward along the grain boundary, thereby obtaining a partitioned grain boundary diffusion magnet that corresponds to the anti-demagnetization requirement.

[0007] Further, step S1 includes: Obtain the surface profile of the magnet and the installation position of the magnet in the rotor of the axial flux motor; Based on the installation position, the side of the magnet closer to the center of the axial flux motor shaft is defined as the inner circumferential side, the side farther from the center of the shaft is defined as the outer circumferential side, and the two sides connecting the inner circumferential side and the outer circumferential side are defined as the circumferential side. Obtain the anti-demagnetization requirement distribution corresponding to the installation position, and map the anti-demagnetization requirement distribution to each surface position of the magnet according to the installation orientation; The anti-demagnetization requirements corresponding to each surface location are associated with the inner peripheral side, the outer peripheral side, and the circumferential side. By associating the surface profile, the installation orientation, and the anti-demagnetization requirements based on the location association, the magnetic steel orientation requirement information is obtained.

[0008] Further, step S2 includes: The anti-demagnetization requirement in the magnetic steel orientation requirement information is mapped to the grain boundary diffusion surface of the magnetic steel; By comparing the anti-demagnetization requirements corresponding to adjacent surface locations, the locations where the anti-demagnetization requirements change are identified. A partition boundary is set along the location where the anti-demagnetization requirement changes, and the grain boundary diffusion surface is divided by the partition boundary to obtain multiple grain boundary diffusion partitions; Based on the anti-demagnetization requirements corresponding to each grain boundary diffusion zone, the unit area material supply of each grain boundary diffusion zone is determined from the correspondence between the anti-demagnetization requirements and the material supply per unit area. By associating each grain boundary diffusion zone, the corresponding zone boundary, and the feed rate per unit area, the diffusion control information of the zone is obtained.

[0009] Further, step S3 includes: The magnet is placed at the magnet bearing position of the partitioned grain boundary diffusion system; The inner circumferential side of the magnet is brought into contact with the inner circumferential positioning reference to determine the inner circumferential orientation of the magnet. The circumferential side of the magnet is brought into contact with the circumferential positioning reference to determine the circumferential orientation of the magnet. The outer peripheral positioning reference is driven to abut against the outer peripheral side of the magnet, so that the surface contour of the magnet corresponds to the partition boundary in the partition diffusion control information. The magnet corresponding to the completed position is clamped to obtain the positioning magnet corresponding to the orientation of the partition diffusion control information.

[0010] Further, step S4 includes: Extract the current grain boundary diffusion partition and its partition boundary from the partition diffusion control information; Adjust the opening position of the shielding component according to the partition boundary so that the opening edge of the shielding component corresponds to the partition boundary of the current grain boundary diffusion partition. The shielding element covers the grain boundary diffusion surface outside the current grain boundary diffusion zone; The current grain boundary diffusion partition is exposed through the opening of the shielding member, and the edge of the opening of the shielding member is made to fit against the grain boundary diffusion surface of the positioning magnet. The area defined by the opening of the shielding member is determined as the isolation feeding area corresponding to the current grain boundary diffusion partition.

[0011] Furthermore, step S4 also includes: The corresponding partition area is determined based on the partition boundary of the current grain boundary diffusion partition, and the unit area feed amount corresponding to the current grain boundary diffusion partition is extracted from the partition diffusion control information. The diffusion source supply quality of the current grain boundary diffusion zone is determined based on the partition area and the corresponding unit area feed rate. According to the quality of the diffusion source supply, the diffusion source is delivered to the isolation supply area corresponding to the current grain boundary diffusion zone; The feeding position is controlled to move sequentially along the boundary of the current grain boundary diffusion zone and inside the zone, so that adjacent feeding trajectories are continuously connected, and the diffusion source covering layer of the current grain boundary diffusion zone is obtained. After the diffusion source attachment of the current grain boundary diffusion zone is completed, the opening position of the shielding member is adjusted according to the partition boundary of the next grain boundary diffusion zone to obtain the isolation feeding area corresponding to the next grain boundary diffusion zone. The diffusion source is attached to each grain boundary diffusion zone in sequence to obtain the coated magnet.

[0012] Further, step S5 includes: According to the required magnet orientation information, place the partition-coated magnets at the coverage inspection position; The grain boundary diffusion surface of the partitioned magnet is directionally illuminated, and surface images of each grain boundary diffusion partition are acquired. The actual coverage area of ​​each grain boundary diffusion zone is determined based on the image difference between the diffusion source-covered surface and the exposed magnet surface. Extract the outer perimeter of the actual coverage area to obtain the actual coverage boundary, and compare the position of the actual coverage boundary with the corresponding partition boundary to obtain the out-of-bounds coverage area; Within the partition boundaries of each grain boundary diffusion zone, the regions separated by the exposed magnet surface are determined, thus obtaining the uncovered regions; The over-boundary covered area and the uncovered area are associated with the corresponding grain boundary diffusion partition to obtain the partition coverage verification result.

[0013] Furthermore, step S5 also includes: Extract the out-of-bounds coverage area from the partition coverage verification results, and determine the grain boundary diffusion partition corresponding to the out-of-bounds coverage area; The location for recovering the diffusion source is controlled to move along the over-boundary coverage area, and the diffusion source in the over-boundary coverage area is removed by negative pressure suction. Extract the uncovered areas from the partition coverage verification results and determine the grain boundary diffusion partition to which the uncovered areas belong; The isolation feeding area is re-formed according to the partition boundary of the grain boundary diffusion partition to which the uncovered area belongs, and the feeding position is moved to the uncovered area; Compensation is provided according to the unit area material supply of the grain boundary diffusion zone to which the uncovered area belongs, and the coverage boundary and coverage continuity are re-verified after compensation. Repeat the process of diffusion source removal, compensation feeding, and coverage verification until the actual coverage boundary of each grain boundary diffusion zone is located within the corresponding zone boundary and the zone is continuously covered, thus obtaining the qualified zone-coated magnet.

[0014] Further, step S6 includes: According to the magnetic steel orientation requirements, the qualified partition coated magnetic steel is clamped so that the orientation of the inner circumferential side, the outer circumferential side, and the circumferential side remains unchanged during the transfer process; The qualified zone-coated magnet is placed on a heat treatment support with a corresponding orientation positioning position, so that the zone orientation of the qualified zone-coated magnet corresponds to the heat treatment support position. The diffusion source covering surface of each grain boundary diffusion zone is kept separate from the heat treatment support, and adjacent qualified zones are coated with magnets and placed at intervals. The heat-treated carrier bearing the qualified partitioned coated magnet is placed in a protective atmosphere for grain boundary diffusion heat treatment, so that the diffusion source in each grain boundary diffusion partition diffuses from the corresponding surface along the grain boundary of the magnet inward. The magnet that has undergone grain boundary diffusion heat treatment is tempered to obtain the partitioned grain boundary diffusion magnet that corresponds to the anti-demagnetization requirement.

[0015] A second aspect of this application relates to an axial flux motor magnet partitioned grain boundary diffusion system, comprising: The magnet orientation calibration module is used to obtain the magnet surface contour, installation orientation, and anti-demagnetization requirements of each surface position. Based on the installation orientation, the inner circumferential side, outer circumferential side, and circumferential side are determined, and each surface position is associated with the anti-demagnetization requirements to obtain the magnet orientation requirement information. The partition diffusion control module is used to divide the grain boundary diffusion partitions according to the anti-demagnetization requirements based on the magnetic steel orientation requirement information, determine the partition boundary and unit area feed of each grain boundary diffusion partition, and obtain partition diffusion control information. A magnet positioning module is used to align the inner circumferential side, the outer circumferential side, and the circumferential side with a positioning reference, and to define the position and orientation of the magnet, thereby obtaining a positioning magnet that corresponds to the orientation of the partition diffusion control information. The partitioned isolation feeding module is used to sequentially isolate and feed each grain boundary diffusion partition of the positioning magnet according to the partitioned diffusion control information, so that the diffusion source attaches according to the corresponding unit area feeding amount, and obtains partitioned coated magnet. The coverage verification and compensation module is used to verify the coverage boundary and coverage continuity of the partitioned coated magnets, remove the cross-boundary diffusion source, and compensate the uncovered area to obtain qualified partitioned coated magnets. The grain boundary diffusion treatment module is used to maintain the partition orientation of the qualified partitioned coated magnets and perform grain boundary diffusion heat treatment, so that the diffusion source diffuses inward along the grain boundary to obtain partitioned grain boundary diffused magnets corresponding to the anti-demagnetization requirements.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. By using the inner circumferential side, outer circumferential side, and circumferential side as common orientation references, the surface position of the magnet, anti-demagnetization requirements, grain boundary diffusion partitioning, partitioning boundary, and unit area material supply are associated with the same magnet. This allows the partitioning results to be continuously retrieved during positioning, material supply, verification, and heat treatment, reducing partitioning misalignment caused by magnet orientation confusion or data mismatch.

[0017] 2. By verifying the correspondence between the surface contour of the magnet and the position of the partition boundary before actual material supply, and forming isolated material supply areas partition by partition according to the partition diffusion control information, the material supply range and quality of each grain boundary diffusion partition are constrained by the corresponding partition boundary and the material supply per unit area, thereby improving the consistency of differentiated material supply.

[0018] 3. By mapping the actual coverage boundary, over-coverage area, uncovered area, and coverage continuity state to the original grain boundary diffusion partition, and implementing clearing and compensation feeding according to the unit area feeding amount of the original partition, a terminateable coverage correction feedback path is formed, so that the magnets entering the grain boundary diffusion heat treatment maintain the partition coverage state as qualified. Attached Figure Description

[0019] Figure 1 This is a flowchart illustrating a control method for a partitioned grain boundary diffusion system of an axial flux motor magnet, according to an embodiment of the present invention. Figure 2 This is a schematic diagram showing the correspondence between the installation orientation, surface position, and grain boundary diffusion partition of a magnet according to an embodiment of the present invention. Figure 3 This is a schematic diagram of a closed-loop control process for coverage verification, boundary clearing, and coverage compensation provided in an embodiment of the present invention. Figure 4This is a functional block diagram of an axial flux motor magnet partitioned grain boundary diffusion system provided in an embodiment of the present invention. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions in the embodiments of this invention will be described more clearly and completely below. Obviously, the described embodiments are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0021] This invention is implemented according to a system method technical solution. The magnet orientation calibration module, zoned diffusion control module, magnet positioning module, zoned isolation feeding module, coverage verification and compensation module, and grain boundary diffusion processing module are functional modules divided according to input data, processing rules, control output, and feedback relationships, and can be configured in the same controller or in mutually communicating control nodes. The positioning, feeding, imaging, diffusion source recovery, and heat treatment execution ends receive module outputs through corresponding control interfaces.

[0022] The "anti-demagnetization requirement" referred to in this invention refers to a discrete requirement level pre-formed by the axial flux motor design end for the target operating conditions and input along with the magnet installation position. The design end determines the required safety margin based on the effective reverse component of the reverse magnetic field in the magnetization direction of the magnet, the operating temperature, and the reference intrinsic coercivity of the magnet substrate at the corresponding temperature, and marks each surface position as a finite number of anti-demagnetization requirement levels according to predetermined design specifications. This system reads the requirement level markings and does not reclassify continuous requirement safety margins. Each anti-demagnetization requirement level corresponds to a local magnetic performance compliance requirement; surface positions located at the level's critical position are assigned to the adjacent level with the higher anti-demagnetization requirement. When the design data records the anti-demagnetization requirement as continuous values, it is first converted into discrete requirement levels by the design end before being input into this system.

[0023] The term "feed quantity per unit area" in this invention refers to the mass of diffusion source command output by the feeding system for a unit grain boundary diffusion surface, provided that the diffusion source formulation, solid mass fraction, feeding state, and adhesion state have been calibrated for the same batch. This feed quantity per unit area already includes the conversion relationship from the command output mass to the effective diffusion source load under a fixed feeding state; when the diffusion source batch, formulation, or feeding state changes, the correspondence between the anti-demagnetization requirement and the feed quantity per unit area is re-established.

[0024] In this invention, both coverage verification and correction are performed before the diffusion source completes drying and curing, ensuring that out-of-bounds diffusion sources remain in a state where they can be removed by negative pressure. The system only identifies magnets that meet the requirements for coverage boundary and coverage continuity as qualified zone-coated magnets; magnets that fail to meet the requirements even after reaching the preset maximum number of corrections are output as abnormal states and withdraw from subsequent heat treatment, and are not output as qualified zone-coated magnets.

[0025] Reference Figure 1 The diagram shown is a flowchart illustrating a control method for a partitioned grain boundary diffusion system of an axial flux motor magnet according to an embodiment of the present invention. In this embodiment, the control method for the partitioned grain boundary diffusion system of the axial flux motor magnet includes: Step S1: Obtain the surface contour, installation orientation, and anti-demagnetization requirements of each surface position of the magnet. Determine the inner circumferential side, outer circumferential side, and circumferential side based on the installation orientation, and associate each surface position with the anti-demagnetization requirements to obtain the magnet orientation requirement information. In this embodiment of the invention, step S1 includes: Obtain the surface profile of the magnet and the installation position of the magnet in the rotor of the axial flux motor; Based on the installation position, the side of the magnet closer to the center of the axial flux motor shaft is defined as the inner circumferential side, the side farther from the center of the shaft is defined as the outer circumferential side, and the two sides connecting the inner circumferential side and the outer circumferential side are defined as the circumferential side. Obtain the anti-demagnetization requirement distribution corresponding to the installation position, and map the anti-demagnetization requirement distribution to each surface position of the magnet according to the installation orientation; The anti-demagnetization requirements corresponding to each surface position are associated with the inner peripheral side, the outer peripheral side, and the circumferential side. By associating the surface profile, the installation orientation, and the anti-demagnetization requirements based on the location association, the magnetic steel orientation requirement information is obtained.

[0026] The boundary of the magnet mounting slot, the center position of the shaft, and the circumferential direction of the rotor are read from the design drawing of the axial flux motor rotor. The outer edge line of the magnet that mates with the magnet mounting slot is read from the magnet manufacturing drawing. The outer edge line of the magnet is aligned with the placement direction of the mounting slot to the rotor disk surface. The surface contour of the magnet is determined by the area enclosed by the outer edge line of the magnet. The installation position of the magnet is determined by the corresponding area of ​​the outer edge line of the magnet in the rotor disk surface. The installation orientation of the magnet is determined by the fixed orientation after the magnet is installed in the mounting slot.

[0027] Along the radial direction from the center of the rotating shaft to the installation position of the magnet, the distances between the two opposite sides of the magnet surface profile are compared. The side closer to the center of the rotating shaft is determined as the inner circumferential side, and the side opposite to the inner circumferential side and farther from the center of the rotating shaft is determined as the outer circumferential side. The remaining two sides of the surface profile that connect the inner circumferential side and the outer circumferential side are determined as the circumferential side. This completes the determination of the orientation of each side of the magnet relative to the center of the rotating shaft and the circumferential direction of the rotor.

[0028] The anti-demagnetization requirement distribution corresponding to the installation position of the magnet in the rotor design data of the axial flux motor is read. The anti-demagnetization requirement distribution records the anti-demagnetization requirement of the area where the magnet is located according to the center of the shaft, the boundary of the magnet mounting slot, and the circumferential direction of the rotor. The boundary of the magnet mounting slot in the anti-demagnetization requirement distribution is aligned with the surface contour, and the inner circumferential direction, outer circumferential direction, and circumferential direction are unified according to the installation orientation, so that each position in the anti-demagnetization requirement distribution corresponds one-to-one with each surface position of the magnet, thereby determining the anti-demagnetization requirement corresponding to each surface position.

[0029] When reading the anti-demagnetization requirement distribution, simultaneously read the requirement level markings and corresponding local magnetic performance compliance requirements for each surface location. (Refer to...) Figure 2 As shown, the first-level anti-demagnetization requirement, the second-level anti-demagnetization requirement, and the third-level anti-demagnetization requirement are used to represent the relative high-low relationship between a finite number of discrete levels, without limiting the actual number of levels; for surface locations that do not carry requirement level markers, the requirement data missing status is output, and the generation of grain boundary diffusion partitions for the magnet is stopped, without inferring the anti-demagnetization requirement of the missing location based on the level of adjacent surface locations.

[0030] Along the direction from the inner circumferential side to the outer circumferential side and the direction between the two circumferential sides, the positions of each surface of the magnet are continuously arranged. The anti-demagnetization requirement corresponding to each surface position is recorded at that surface position. The surface positions close to the inner circumferential side, the outer circumferential side, or the circumferential side are respectively established with the corresponding side, so that the anti-demagnetization requirement of each surface position can be located according to the inner circumferential side, the outer circumferential side, and the circumferential side, and the anti-demagnetization requirement after position association is obtained.

[0031] The surface profile, installation position, installation orientation, inner peripheral side, outer peripheral side, circumferential side, and the anti-demagnetization requirement associated with the position are recorded for the same magnet. The surface profile defines the range of the magnet's grain boundary diffusion surface, the installation orientation defines the placement orientation of the magnet during subsequent positioning and feeding processes, each side defines the orientation reference of the surface position, and the anti-demagnetization requirement associated with the position defines the grain boundary diffusion requirement of each surface position, thus obtaining the magnet's orientation requirement information.

[0032] The beneficial effects are that by determining the inner circumferential side, outer circumferential side, and circumferential side based on the actual installation position and orientation of the magnet in the rotor of the axial flux motor, and by associating the anti-demagnetization requirements corresponding to each surface position with the orientation reference, the subsequent grain boundary diffusion partitioning can be determined simultaneously based on the magnet surface profile, the actual installation orientation, and the local anti-demagnetization requirements. This avoids partitioning misalignment caused by the inconsistency between the magnet placement direction and the diffusion partitioning direction, and provides a clear positional basis for the boundary determination and differentiated material supply of each grain boundary diffusion partition.

[0033] Step S2: Based on the magnetic steel orientation requirement information, divide the grain boundary diffusion zones according to the anti-demagnetization requirement, determine the zone boundary and unit area material supply of each grain boundary diffusion zone, and obtain the zone diffusion control information. In this embodiment of the invention, step S2 includes: The anti-demagnetization requirement in the magnetic steel orientation requirement information is mapped to the grain boundary diffusion surface of the magnetic steel; By comparing the anti-demagnetization requirements corresponding to adjacent surface locations, the locations where the anti-demagnetization requirements change are identified. A partition boundary is set along the location where the anti-demagnetization requirement changes, and the grain boundary diffusion surface is divided by the partition boundary to obtain multiple grain boundary diffusion partitions; Based on the anti-demagnetization requirements corresponding to each grain boundary diffusion zone, the unit area material supply of each grain boundary diffusion zone is determined from the correspondence between the anti-demagnetization requirements and the material supply per unit area. By associating each grain boundary diffusion zone, the corresponding zone boundary, and the feed rate per unit area, the diffusion control information of the zone is obtained.

[0034] The surface contour in the magnetic steel orientation requirement information is mapped to the surface of the magnetic steel to be coated. The surface of the magnetic steel to be coated is determined as the grain boundary diffusion surface. The inner circumferential side, outer circumferential side and circumferential side in the magnetic steel orientation requirement information are used as directional references. The anti-demagnetization requirements after position association are transferred to the grain boundary diffusion surface one by one according to the corresponding surface position, so that each surface position on the grain boundary diffusion surface has a definite anti-demagnetization requirement.

[0035] The demand level markers of consecutive adjacent surface positions are compared position by position along the direction from the inner circumferential side to the outer circumferential side, and the same comparison is performed along the direction between the two circumferential sides. When the demand level markers of adjacent surface positions are the same, their continuity is maintained; when the demand level markers are different, the demand conversion position is recorded at the boundary between the two adjacent positions. When the boundary passes through the smallest surface position unit, the surface position unit is assigned to the adjacent level with a higher demagnetization resistance requirement. Isolated demand regions consisting of one or more consecutive surface positions with demand levels different from the surrounding positions are retained and used as candidate regions for independent grain boundary diffusion partitions, and are not incorporated into the surrounding regions with lower demagnetization resistance requirements according to area size.

[0036] According to the positions where the anti-demagnetization requirements change on the grain boundary diffusion surface, the dividing lines are extended sequentially to connect the positions of requirement changes in the same continuous direction, and the ends of the dividing lines are extended to adjacent dividing lines or the outer edge of the grain boundary diffusion surface. The dividing lines form the partition boundaries, and the partition boundaries and the outer edge of the grain boundary diffusion surface enclose multiple non-overlapping continuous regions. Each continuous region is defined as the grain boundary diffusion partition, so that the surface position inside each grain boundary diffusion partition corresponds to the same anti-demagnetization requirement.

[0037] The correspondence between the anti-demagnetization requirement and the unit area supply amount was established using the grain boundary diffusion verification results of the same batch of magnetic steel samples. For each anti-demagnetization requirement level, the corresponding local magnetic performance qualification requirements were read from the design data, and multiple sequentially increasing unit area diffusion source supply amounts were set. Diffusion source attachment, grain boundary diffusion heat treatment, and tempering treatment were performed on magnetic steel samples with the same material composition and initial magnetic properties, respectively. The local magnetic performance of the corresponding treated area of ​​each sample was tested using the same detection method. When the test results met the local magnetic performance qualification requirements corresponding to the requirement level, the sample was determined to meet the corresponding anti-demagnetization requirement level, and the supply amount used by the sample with the lowest unit area diffusion source supply amount among those meeting the requirements was determined as the unit area supply amount corresponding to that anti-demagnetization requirement level. Each requirement level, local magnetic performance qualification requirement, and corresponding unit area supply amount were correlated one by one to establish the correspondence between the anti-demagnetization requirement and the unit area supply amount.

[0038] When establishing the above correspondence, the composition of the diffusion source, solid mass fraction, feeding state, grain boundary diffusion temperature and holding time, tempering temperature and holding time, protective atmosphere conditions, and local magnetic property detection methods were all read from the confirmed process cards and calibration records corresponding to the same material grade and the same diffusion source batch, and were kept consistent across all samples; this control method only changes the diffusion source supply per unit area for each sample. When any diffusion source batch, feeding state, or heat treatment conditions change, the original correspondence is no longer directly invoked, and a new correspondence is established according to the same verification process.

[0039] Based on the correspondence between the anti-demagnetization requirement and the unit area supply, according to the anti-demagnetization requirement corresponding to the internal surface position of each grain boundary diffusion partition, the unit area supply that is consistent with the anti-demagnetization requirement is found, and the unit area supply is determined as the unit area supply of the corresponding grain boundary diffusion partition, so that grain boundary diffusion partitions with different anti-demagnetization requirements have a unit area supply corresponding to their anti-demagnetization requirements.

[0040] According to the inner circumferential side, outer circumferential side, and circumferential side of the magnetic steel orientation requirement information, the orientation of each grain boundary diffusion partition on the grain boundary diffusion surface is recorded. The surface range included by each grain boundary diffusion partition and its corresponding partition boundary are recorded. Each grain boundary diffusion partition is associated with the corresponding unit area feeding amount, so that any grain boundary diffusion partition can retrieve the corresponding unit area feeding amount according to its orientation and partition boundary to obtain the partition diffusion control information.

[0041] The beneficial effects are that by accurately mapping the anti-demagnetization requirements of each surface of the magnet to the grain boundary diffusion surface, and determining the partition boundaries based on the locations where the anti-demagnetization requirements change, each grain boundary diffusion partition is kept consistent with the local anti-demagnetization requirements. Furthermore, the material supply per unit area is determined for each grain boundary diffusion partition, thereby providing a clear partition range and material supply basis for subsequent partition positioning, isolation material supply, and coverage verification. This reduces diffusion source mismatch and ineffective supply, and improves the matching degree between the partitioned grain boundary diffusion treatment and the actual anti-demagnetization requirements of the magnet.

[0042] Step S3: Align the inner circumferential side, outer circumferential side, and circumferential side with the positioning reference, and define the position and orientation of the magnet to obtain the positioning magnet corresponding to the orientation of the partition diffusion control information; In this embodiment of the invention, step S3 includes: The magnet is placed at the magnet bearing position of the partitioned grain boundary diffusion system; The inner circumferential side of the magnet is brought into contact with the inner circumferential positioning reference to determine the inner circumferential orientation of the magnet. The circumferential side of the magnet is brought into contact with the circumferential positioning reference to determine the circumferential orientation of the magnet. The outer peripheral positioning reference is driven to abut against the outer peripheral side of the magnet, so that the surface contour of the magnet corresponds to the partition boundary in the partition diffusion control information. The magnet corresponding to the completed position is clamped to obtain the positioning magnet corresponding to the orientation of the partition diffusion control information.

[0043] The magnet is placed in the magnet bearing position of the partitioned grain boundary diffusion system with the grain boundary diffusion surface facing the feeding direction, so that the surface contour of the magnet completely falls within the bearing range defined by the magnet bearing position, and the inner circumferential side of the magnet faces the inner circumferential positioning reference, the outer circumferential side faces the outer circumferential positioning reference, and the circumferential side faces the circumferential positioning reference, thereby establishing the initial correspondence between the magnet and each positioning reference.

[0044] The magnet is pushed to move along the bearing surface of the magnet bearing position to the inner circumferential positioning reference until the inner circumferential side of the magnet continuously abuts against the inner circumferential positioning reference. The inner circumferential positioning reference restricts the magnet from moving further inward in the direction of the inner circumference. The abutment position of the inner circumferential side is used as the position reference of the magnet in the radial direction to determine the inner circumferential orientation of the magnet.

[0045] Keep the inner circumference of the magnet in contact with the inner circumference positioning reference, and push the magnet to move in the circumferential direction until the circumferential side of the magnet continuously contacts the circumferential positioning reference. The circumferential positioning reference restricts the magnet from continuing to move in the circumferential direction, and the contact position of the circumferential side is used as the position reference of the magnet in the circumferential direction to determine the circumferential orientation of the magnet.

[0046] While keeping the inner and circumferential orientations of the magnet unchanged, the outer circumferential positioning reference is driven to move in the direction from the outer circumferential side to the inner circumferential side until the outer circumferential positioning reference abuts against the outer circumferential side of the magnet. The inner circumferential positioning reference, the circumferential positioning reference, and the outer circumferential positioning reference jointly define the planar position and placement orientation of the magnet, so that the inner circumferential side, outer circumferential side, and circumferential side of the magnet surface contour are respectively consistent with the orientation reference in the partition diffusion control information, and each partition boundary corresponds to a predetermined position on the grain boundary diffusion surface of the magnet.

[0047] After the inner circumferential positioning reference, circumferential positioning reference, and outer circumferential positioning reference are aligned with the magnet, the magnet is kept in an unclamped state. A positioning image of the magnet's grain boundary diffusion surface is acquired. The actual surface contour of the magnet in the positioning image is mapped to the surface contour of the magnet in the partition diffusion control information according to the inner circumferential side, outer circumferential side, and circumferential side. The boundaries of each partition in the partition diffusion control information are superimposed onto the positioning image. The positional deviation of each partition boundary relative to the actual surface contour of the magnet is determined. The positional deviation is compared with the positioning allowable range determined based on the positioning accuracy of the shielding opening edge. When the positional deviation of each partition boundary is within the positioning allowable range, the position and orientation of the magnet are determined to meet the partition feeding requirements. When the positional deviation of any partition boundary exceeds the positioning allowable range, the contact state of the outer circumferential positioning reference is released, and the position of the magnet is adjusted along the corresponding deviation direction. The positioning and positional deviation comparison of the inner circumferential side, circumferential side, and outer circumferential side are completed again until the positional deviation of each partition boundary is within the positioning allowable range.

[0048] After the positional deviations of each partition boundary are all within the allowable positioning range, the driving clamp moves toward the magnet, so that the clamp applies a holding effect toward the magnet bearing position, and the inner circumferential positioning reference, circumferential positioning reference and outer circumferential positioning reference respectively restrict the movement of the magnet in the corresponding direction, thereby maintaining the positional correspondence between the surface contour of the magnet and the partition boundary in the partition diffusion control information, and obtaining the positioning magnet corresponding to the orientation of the partition diffusion control information.

[0049] The beneficial effects are that the radial position, circumferential position and placement orientation of the magnet are defined sequentially by the inner circumferential positioning reference, the circumferential positioning reference and the outer circumferential positioning reference. After verifying and correcting the positional deviation between the actual surface contour of the magnet and the partition boundary, the magnet is clamped, so that the magnet maintains a stable orientational correspondence during the subsequent partition isolation and diffusion source feeding process. This avoids the situation where only mechanical contact is completed but the partition boundary still shifts positionally, and improves the accuracy of the feeding position of each grain boundary diffusion partition and the consistency of repeated positioning.

[0050] Step S4: According to the partitioned diffusion control information, the diffusion partitions of the positioning magnet are sequentially isolated and fed with materials so that the diffusion source is attached according to the corresponding unit area material supply amount, thereby obtaining the partitioned coated magnet. In this embodiment of the invention, step S4 includes: Extract the current grain boundary diffusion partition and its partition boundary from the partition diffusion control information; Adjust the opening position of the shielding component according to the partition boundary so that the opening edge of the shielding component corresponds to the partition boundary of the current grain boundary diffusion partition. The shielding element covers the grain boundary diffusion surface outside the current grain boundary diffusion zone; The current grain boundary diffusion partition is exposed through the opening of the shielding member, and the edge of the opening of the shielding member is made to fit against the grain boundary diffusion surface of the positioning magnet. The area defined by the opening of the shielding member is determined as the isolation feeding area corresponding to the current grain boundary diffusion partition.

[0051] The orientation, surface range, and partition boundary of each grain boundary diffusion partition on the grain boundary diffusion surface of the positioning magnet are read from the partition diffusion control information. The feeding order is determined according to the positional relationship between each grain boundary diffusion partition on the inner circumferential side, outer circumferential side, and circumferential side. The grain boundary diffusion partition in the current feeding order is determined as the current grain boundary diffusion partition, and all partition boundaries surrounding the current grain boundary diffusion partition are extracted.

[0052] While maintaining the position and orientation of the positioning magnet, the boundaries of each partition of the current grain boundary diffusion zone are decomposed into continuously connected short boundary segments according to the positioning allowable range. Straight partition boundaries are represented by one or more collinear short boundary segments, and curved partition boundaries are approximated by multiple sequentially connected short boundary segments. Each shielding portion constituting the opening edge of the shielding element is driven to move independently along a direction parallel to the grain boundary diffusion surface, so that the inner edge of each shielding portion corresponds to one or more short boundary segments. When the maximum positional deviation between the opening edge formed by the inner edges and the original partition boundary does not exceed the positioning allowable range, the opening edge is determined to correspond to the partition boundary of the current grain boundary diffusion zone.

[0053] When the positional deviation between any opening edge and the original partition boundary exceeds the allowable positioning range, an opening correspondence anomaly is output and the current partition feeding is stopped; the corresponding shielding part is readjusted until all opening edges meet the positional deviation requirements before the shielding part is driven to move toward the positioning magnet. Thus, when the partition boundary is curved, an opening profile matching its allowable positional range is formed through continuous short boundary segments, without requiring the shielding part to form an arbitrary curve without error.

[0054] The shielding member, after completing the opening adjustment, moves toward the positioning magnet, so that the shielding member covers the grain boundary diffusion surface of the positioning magnet, and all grain boundary diffusion surfaces outside the current grain boundary diffusion zone are within the shielding range of the shielding member, thereby preventing the subsequently supplied diffusion source from attaching to the grain boundary diffusion surface outside the current grain boundary diffusion zone.

[0055] Keeping the opening edge of the shielding member aligned with the boundary position of the current grain boundary diffusion zone, the shielding member continues to move toward the positioning magnet until all the opening edges forming the opening are continuously in contact with the grain boundary diffusion surface of the positioning magnet, so that the current grain boundary diffusion zone is fully exposed through the opening, and the movement path of the diffusion source from the opening edge into the adjacent grain boundary diffusion zone is blocked.

[0056] The exposed area enclosed by the opening edge of the shielding component and the grain boundary diffusion surface of the positioning magnet is defined as the isolation feeding area corresponding to the current grain boundary diffusion partition. The isolation feeding area is then correlated with the current grain boundary diffusion partition and its unit area feeding amount, so that the subsequent supplied diffusion source only enters the isolation feeding area and attaches to the current grain boundary diffusion partition according to the corresponding unit area feeding amount.

[0057] The beneficial effect is that by adjusting the opening position of the shielding component according to the partition boundary, and by having the shielding component cover the grain boundary diffusion surface outside the current grain boundary diffusion partition, the opening edge is accurately aligned with the partition boundary and fits into the positioning magnet, thereby forming an independent isolation feeding area for each grain boundary diffusion partition, restricting the diffusion source from moving beyond the boundary to the adjacent grain boundary diffusion partition, and providing a clear feeding range for subsequent partition feeding according to the corresponding unit area feeding amount and obtaining partition coated magnets.

[0058] Step S4 further includes: The corresponding partition area is determined based on the partition boundary of the current grain boundary diffusion partition, and the unit area feed amount corresponding to the current grain boundary diffusion partition is extracted from the partition diffusion control information. The diffusion source supply quality of the current grain boundary diffusion zone is determined based on the partition area and the corresponding unit area feed rate. According to the quality of the diffusion source supply, the diffusion source is delivered to the isolation supply area corresponding to the current grain boundary diffusion zone; The feeding position is controlled to move sequentially along the boundary of the current grain boundary diffusion zone and inside the zone, so that adjacent feeding trajectories are continuously connected, and the diffusion source covering layer of the current grain boundary diffusion zone is obtained. After the diffusion source attachment of the current grain boundary diffusion zone is completed, the opening position of the shielding member is adjusted according to the partition boundary of the next grain boundary diffusion zone to obtain the isolation feeding area corresponding to the next grain boundary diffusion zone. The diffusion source is attached to each grain boundary diffusion zone in sequence to obtain the coated magnet.

[0059] Based on the current grain boundary diffusion partition boundary, the surface range enclosed by the partition boundary is mapped to the area calibration map. The complete areas completely located within the partition boundary and the edge areas crossed by the partition boundary are counted. The corresponding area is determined according to the actual occupied range of each edge area within the partition boundary. All areas are merged to obtain the partition area of ​​the current grain boundary diffusion partition. At the same time, the unit area feed quantity associated with the current grain boundary diffusion partition is read from the partition diffusion control information.

[0060] The current diffusion source supply quality for the grain boundary diffusion zone is determined by the product of the zone area and the corresponding feed rate per unit area, specifically expressed as follows: ; In the formula, For the first The quality of diffusion source supply to each grain boundary diffusion zone. For the first Feed rate per unit area corresponding to each grain boundary diffusion zone For the first The diffusion source supply quality of the current grain boundary diffusion partition is obtained by substituting the partition area of ​​the current grain boundary diffusion partition and the corresponding unit area feed rate into the formula.

[0061] A diffusion source of equal mass to the diffusion source supply is loaded into a weighing and feeding container, which is connected to a feeding head located above the current grain boundary diffusion zone. The opening edge of the shielding member is kept in contact with the grain boundary diffusion surface of the positioning magnet. The weighing and feeding container is driven to continuously feed the diffusion source into the feeding head, which then transports the diffusion source to the isolation feeding area corresponding to the current grain boundary diffusion zone. The feeding is stopped when all the diffusion source in the weighing and feeding container is output, so that the mass of the diffusion source entering the isolation feeding area is consistent with the mass of the diffusion source supply.

[0062] Under the condition that the diffusion source formulation, feeding status, and feed head working status are kept consistent within the same batch, the feed head's discharge status, moving speed, effective feeding width, and spacing between adjacent feeding trajectories are pre-calibrated, and the feeding parameter combination that can form the corresponding unit area feeding quantity is associated with the unit area feeding quantity. When feeding is executed, the feeding parameter combination corresponding to the current grain boundary diffusion partition is called, and the feed head is controlled to pass through the partition boundary and the interior of the partition sequentially along the pre-generated feeding path, while simultaneously recording the feeding trajectory executed by the feed head and its corresponding surface range; when the subsequent feeding path enters the surface range where feeding has been completed, the output of the diffusion source stops, and the output resumes after leaving the surface range, so that the boundary feeding trajectory and the feeding trajectory inside the partition are continuously connected at the predetermined connection position and do not repeatedly pass through the same surface range, thereby distributing the determined diffusion source supply quality in the current grain boundary diffusion partition.

[0063] The feed head is driven to move continuously along all partition boundaries from one partition boundary of the current grain boundary diffusion zone, so that the diffusion source covers the periphery of the inner side of the partition boundary. Then, the feed head is driven to move parallel back and forth along the interior of the current grain boundary diffusion zone, so that the starting edge of the next feed trajectory is continuously connected with the ending edge of the previous feed trajectory, and the diffusion source is continuously attached at the position where the feed head passes, until the entire isolated feed area is completely covered, thus obtaining the diffusion source covering layer of the current grain boundary diffusion zone.

[0064] After the diffusion source attachment of the current grain boundary diffusion zone is completed, the diffusion source delivery is stopped and the feed head is moved out of the isolation feed area. The shielding member is driven to leave the grain boundary diffusion surface of the positioning magnet. The next grain boundary diffusion zone and its partition boundary are extracted from the partition diffusion control information. The opening position of the shielding member is adjusted according to the partition boundary of the next grain boundary diffusion zone. The shielding member covers the grain boundary diffusion surface outside the next grain boundary diffusion zone again, and the opening edge is attached to the grain boundary diffusion surface of the positioning magnet to obtain the isolation feed area corresponding to the next grain boundary diffusion zone.

[0065] According to the feeding sequence of each grain boundary diffusion zone, the next grain boundary diffusion zone is sequentially subjected to zone area determination, diffusion source supply quality determination, diffusion source conveying and feeding trajectory movement, and a corresponding diffusion source covering layer is formed after the completion of a grain boundary diffusion zone, until all grain boundary diffusion zones of the positioning magnet have completed diffusion source attachment, and the positioning magnet with multiple diffusion source covering layers corresponding to different unit area feeding amounts is determined as the zone coated magnet.

[0066] The beneficial effects are that by determining the diffusion source supply quality based on the partition area and the amount of material supplied per unit area of ​​each grain boundary diffusion partition, and by continuously moving the supply position within the isolated supply area according to the partition boundary and the interior of the partition, each grain boundary diffusion partition forms a diffusion source covering layer corresponding to its surface range and anti-demagnetization requirements. At the same time, by adjusting the opening position of the shielding component partition by partition, the independent supply of materials to different grain boundary diffusion partitions is completed, thereby improving the accuracy of the correspondence between the diffusion source supply quality, the covering position and the partition range, and reducing the situation of insufficient diffusion source supply, excessive supply and diffusion into adjacent grain boundary diffusion partitions.

[0067] Step S5: Verify the coverage boundary and coverage continuity of the partitioned coated magnets, remove the cross-boundary diffusion sources, and compensate for the uncovered areas by feeding materials to obtain qualified partitioned coated magnets. Reference Figure 3 The diagram shown is a schematic of the coverage verification, cross-boundary diffusion source removal, and uncovered area compensation process provided in an embodiment of the present invention.

[0068] In this embodiment of the invention, step S5 includes: According to the required magnet orientation information, place the partition-coated magnets at the coverage inspection position; The grain boundary diffusion surface of the partitioned magnet is directionally illuminated, and surface images of each grain boundary diffusion partition are acquired. The actual coverage area of ​​each grain boundary diffusion zone is determined based on the image difference between the diffusion source-covered surface and the exposed magnet surface. Extract the outer perimeter of the actual coverage area to obtain the actual coverage boundary, and compare the position of the actual coverage boundary with the corresponding partition boundary to obtain the out-of-bounds coverage area; Within the partition boundaries of each grain boundary diffusion zone, the regions separated by the exposed magnet surface are determined, thus obtaining the uncovered regions; The over-boundary covered area and the uncovered area are associated with the corresponding grain boundary diffusion partition to obtain the partition coverage verification result.

[0069] The placement orientation of the partitioned coated magnet is determined according to the inner circumferential side, outer circumferential side, and circumferential side in the magnet orientation requirement information. The partitioned coated magnet is placed in the coverage inspection position with its grain boundary diffusion surface facing the inspection direction. The inner circumferential side, outer circumferential side, and circumferential side are respectively aligned with the corresponding orientation reference of the coverage inspection position. The position of the partitioned coated magnet is then maintained so that the orientation of each grain boundary diffusion partition is consistent with the partition orientation in the partition diffusion control information.

[0070] An illuminator is positioned above the grain boundary diffusion surface of the partitioned magnet, so that the illumination direction is fixed relative to the grain boundary diffusion surface and the illumination range covers the entire grain boundary diffusion partition. An imaging device sequentially acquires surface images of each grain boundary diffusion partition along a direction perpendicular to the grain boundary diffusion surface, so that the reflection state of the diffusion source-covered surface and the bare magnet surface is recorded simultaneously in the same surface image.

[0071] Before surface image identification, under the same illumination direction, imaging direction, and exposure settings as the surface image, a reference image of the exposed surface of the same batch of magnets and a reference image forming a complete coverage according to the current diffusion source state are acquired. Exposed magnet reference features and diffusion source coverage reference features are established respectively. For each location in the surface image, brightness and darkness state and surface texture features are extracted and compared with the two types of reference features. The comparisons are performed in a fixed order: brightness and darkness state first, then surface texture features. It is determined whether the brightness and darkness state at that location is closer to the exposed magnet reference feature or the diffusion source coverage reference feature, and whether the surface texture feature at that location is closer to the exposed magnet reference feature or the diffusion source coverage reference feature. When the comparison results of brightness and darkness state and surface texture features both point to the same reference state, that location is determined as the exposed magnet location or diffusion source coverage location corresponding to that reference state. When the two comparison results point to different reference states, the comprehensive feature differences corresponding to the two types of reference states are the same, or the difference between the two types of comprehensive feature differences does not exceed the discrimination margin, that location is marked as a critical location. The discrimination margin is determined based on repeated acquisition results of bare surface reference images and complete coverage reference images from the same batch, and is associated with and recorded with the corresponding imaging element, lighting conditions, and exposure settings. Critical positions located within the corresponding partition boundary are treated as exposed magnet positions, while critical positions located outside the corresponding partition boundary are treated as diffusion source coverage positions, to conservatively verify uncovered and over-boundary coverage states. Then, the interconnected diffusion source coverage positions are merged into a continuous surface range to obtain the actual coverage area of ​​each grain boundary diffusion partition.

[0072] Edge positions are continuously extracted along the boundary between each actual covered area and the adjacent non-covered position. The interconnected edge positions are connected sequentially to obtain the actual covered boundary of the corresponding grain boundary diffusion partition. The actual covered boundary is then mapped to the partition boundary in the partition diffusion control information according to the orientation of the inner peripheral side, outer peripheral side and circumferential side. The actual covered area located outside the corresponding partition boundary is determined as the over-boundary covered area.

[0073] Within the boundary of each grain boundary diffusion zone, the location of exposed magnets is checked position by position. All exposed magnets located within the zone boundary are grouped into one or more continuous surface ranges according to their continuous adjacency. Regardless of whether the exposed magnet location is surrounded by a diffusion source coverage location, located between adjacent diffusion source coverage locations, or connected to the zone boundary, it is determined as an uncovered area, and only exposed magnet locations located outside the corresponding zone boundary are excluded.

[0074] For each grain boundary diffusion partition, a continuity check is performed on the actual coverage area. A diffusion source coverage position in the actual coverage area is determined as the starting position of the check. The check is then extended position by position along the diffusion source coverage positions that are continuously adjacent to the starting position in the surface image. All positions that can be reached from each other through continuously adjacent diffusion source coverage positions are included in the same continuous coverage range. The remaining diffusion source coverage positions in the current grain boundary diffusion partition are checked in the same way. When all diffusion source coverage positions in the grain boundary diffusion partition are included in the same continuous coverage range and there is no uncovered area, the coverage continuity state of the grain boundary diffusion partition is determined to be continuous coverage. When two or more unconnected continuous coverage ranges are formed or there is an uncovered area that separates adjacent diffusion source coverage positions, the coverage continuity state of the grain boundary diffusion partition is determined to be discontinuous coverage.

[0075] According to the magnetic steel orientation requirement information, record the position of each actual coverage boundary, over-boundary coverage area and uncovered area on the grain boundary diffusion surface. Associate the over-boundary coverage area with the grain boundary diffusion partition corresponding to its diffusion source, and associate the uncovered area with the grain boundary diffusion partition corresponding to its partition boundary. Record the actual coverage boundary, over-boundary coverage area, uncovered area and coverage continuity status of each grain boundary diffusion partition accordingly to obtain the partition coverage verification result.

[0076] The beneficial effects are that by acquiring surface images of each grain boundary diffusion zone under a unified orientation reference, and determining the actual covered area, actual covered boundary, over-boundary covered area, and uncovered area based on the image differences between the diffusion source covered surface and the exposed magnet surface, the coverage state of the diffusion source can be distinguished and corresponded to the predetermined zone boundary one by one. This provides a clear location basis for subsequent removal of over-boundary diffusion sources and compensation feeding of uncovered areas, thereby improving the accuracy of the coverage boundary and coverage continuity of each grain boundary diffusion zone.

[0077] Step S5 further includes: Extract the out-of-bounds coverage area from the partition coverage verification results, and determine the grain boundary diffusion partition corresponding to the out-of-bounds coverage area; The location for recovering the diffusion source is controlled to move along the over-boundary coverage area, and the diffusion source in the over-boundary coverage area is removed by negative pressure suction. Extract the uncovered areas from the partition coverage verification results and determine the grain boundary diffusion partition to which the uncovered areas belong; The isolation feeding area is re-formed according to the partition boundary of the grain boundary diffusion partition to which the uncovered area belongs, and the feeding position is moved to the uncovered area; Compensation is provided according to the unit area material supply of the grain boundary diffusion zone to which the uncovered area belongs, and the coverage boundary and coverage continuity are re-verified after compensation. Repeat the process of diffusion source removal, compensation feeding, and coverage verification until the actual coverage boundary of each grain boundary diffusion zone is located within the corresponding zone boundary and the zone is continuously covered, thus obtaining the qualified zone-coated magnet.

[0078] The location range of each over-boundary coverage area on the grain boundary diffusion surface and its positional relationship relative to the partition boundary are read from the partition coverage verification results. The over-boundary coverage area is mapped to the partition coated with magnet according to the magnet orientation requirement information. The diffusion source is determined according to the actual coverage area connected to the over-boundary coverage area. The grain boundary diffusion partition where the diffusion source is located is determined as the grain boundary diffusion partition corresponding to the over-boundary coverage area.

[0079] Keeping the placement orientation of the partitioned coated magnet unchanged at the coverage inspection position, move the suction port of the diffusion source recovery component to one edge of the over-boundary coverage area, so that the suction port faces the over-boundary coverage area and is close to the grain boundary diffusion surface. Start negative pressure suction and control the suction port to move continuously along the edge and inside of the over-boundary coverage area, so that the over-boundary attached diffusion source enters the diffusion source recovery component until the over-boundary coverage area is restored to the bare magnet surface, thereby removing the diffusion source in the over-boundary coverage area.

[0080] The location range of each uncovered region on the grain boundary diffusion surface is read from the partition coverage verification results. The uncovered regions are mapped to the partition coated magnets according to their positions relative to the inner, outer, and circumferential sides. The partition boundary surrounding the uncovered region is mapped to the partition boundary in the partition diffusion control information. The grain boundary diffusion partition defined by the partition boundary is determined as the grain boundary diffusion partition to which the uncovered region belongs.

[0081] Keeping the position and orientation of the coated magnet unchanged, adjust the opening position of the shielding member according to the partition boundary of the grain boundary diffusion partition to which the uncovered area belongs, so that the shielding member covers the grain boundary diffusion surface outside the grain boundary diffusion partition, and the opening edge of the shielding member is aligned with the corresponding partition boundary, thereby re-forming the isolation feeding area corresponding to the grain boundary diffusion partition. Then, move the feeding head along the isolation feeding area to the starting edge of the uncovered area, so that the feeding position accurately corresponds to the uncovered area.

[0082] The area of ​​the uncovered region is determined based on its location range, and the mass of the diffusion source required for this compensation feed is determined based on the area of ​​the uncovered region and the unit area feed rate of its corresponding grain boundary diffusion zone. During compensation feed, the feed parameter combination corresponding to the grain boundary diffusion zone to which the uncovered region belongs is called, controlling the feed head to feed only along the edge and interior of the uncovered region where no diffusion source cover layer has been formed, and stopping the output of diffusion source to adjacent covered regions, so that the newly formed diffusion source cover layer is continuously connected with the adjacent original diffusion source cover layer. After the compensation feed is completed, the surface image of the grain boundary diffusion surface is re-acquired according to the same illumination direction and imaging direction, and the actual coverage boundary, the over-boundary coverage area, and the uncovered area are determined again, thereby re-verifying the coverage boundary and coverage continuity state after compensation.

[0083] Based on the re-verified partition coverage verification results, each grain boundary diffusion partition is checked sequentially. If there is an over-boundary coverage area, the corresponding diffusion source is removed again by negative pressure suction. If there is an uncovered area, an isolation supply area is formed again and compensation supply is implemented. The corrected grain boundary diffusion surface is then verified for coverage until the actual coverage boundary of each grain boundary diffusion partition is within the corresponding partition boundary, there are no uncovered areas, and the coverage continuity is continuous. The partition-coated magnets that meet the requirements of coverage boundary and coverage continuity are determined as the qualified partition-coated magnets.

[0084] The beneficial effects are as follows: by mapping the over-boundary covered area and the uncovered area to specific grain boundary diffusion zones, and by using negative pressure suction to remove the over-boundary diffusion source and implementing directional compensation feeding in the newly formed isolation feeding area, the actual coverage boundary of the zoned coated magnet is kept consistent with the predetermined zone boundary and the coverage gap inside the zone is eliminated. At the same time, the continuous coordination of correction and verification ensures that each grain boundary diffusion zone meets the complete coverage requirement, thereby improving the accuracy of diffusion source zone adhesion and the processing consistency of qualified zone coated magnets.

[0085] Step S6: Maintain the orientation of the qualified partitioned coated magnet and perform grain boundary diffusion heat treatment to allow the diffusion source to diffuse inward along the grain boundary, thereby obtaining a partitioned grain boundary diffusion magnet that corresponds to the anti-demagnetization requirement.

[0086] In this embodiment of the invention, step S6 includes: According to the magnetic steel orientation requirements, the qualified partition coated magnetic steel is clamped so that the orientation of the inner circumferential side, the outer circumferential side, and the circumferential side remains unchanged during the transfer process; The qualified zone-coated magnet is placed on a heat treatment support with a corresponding orientation positioning position, so that the zone orientation of the qualified zone-coated magnet corresponds to the heat treatment support position. The diffusion source covering surface of each grain boundary diffusion zone is kept separate from the heat treatment support, and adjacent qualified zones are coated with magnets and placed at intervals. The heat-treated carrier bearing the qualified partitioned coated magnet is placed in a protective atmosphere for grain boundary diffusion heat treatment, so that the diffusion source in each grain boundary diffusion partition diffuses from the corresponding surface along the grain boundary of the magnet inward. The magnet that has undergone grain boundary diffusion heat treatment is tempered to obtain the partitioned grain boundary diffusion magnet that corresponds to the anti-demagnetization requirement.

[0087] According to the required orientation information of the magnet, determine the inner circumference, outer circumference, and circumferential side of the qualified partition-coated magnet. The clamping mechanism clamps the qualified partition-coated magnet on the side without a diffusion source cover layer. The qualified partition-coated magnet is lifted in a direction perpendicular to the bearing surface, and the orientation of the clamping mechanism remains unchanged during the transfer process to prevent the qualified partition-coated magnet from rotating or flipping. This ensures that the orientation of the inner circumference, outer circumference, and circumferential side remains unchanged during the transfer process.

[0088] The qualified partition-coated magnet is moved above the heat treatment support, with its inner circumferential side facing the inner circumferential positioning position of the heat treatment support, its outer circumferential side facing the outer circumferential positioning position of the heat treatment support, and its circumferential side facing the circumferential positioning position of the heat treatment support. The qualified partition-coated magnet is then placed in the heat treatment support position defined by the positioning positions in each direction, so that the surface contour of the qualified partition-coated magnet corresponds to the heat treatment support position, thereby ensuring that the partition orientation of the qualified partition-coated magnet corresponds to the heat treatment support position.

[0089] The qualified zone coated magnets without diffusion source covering layers are supported by the bearing protrusions at the bottom of the heat treatment bearing positions, so that the diffusion source covering surfaces of each grain boundary diffusion zone face the open side of the heat treatment bearing and remain separated from the heat treatment bearing. At the same time, adjacent qualified zone coated magnets are placed at heat treatment bearing positions that are spaced apart from each other, so that the diffusion source covering surfaces and sides of adjacent qualified zone coated magnets do not contact each other.

[0090] The heat treatment carrier bearing the qualified zone-coated magnet is placed in a grain boundary diffusion furnace and the furnace cavity is sealed. After the air in the furnace cavity is extracted, argon gas is continuously introduced into the furnace cavity to form a protective atmosphere. Under the protective atmosphere, the furnace cavity is heated to the temperature required for grain boundary diffusion treatment and maintained, so that the diffusion source in each grain boundary diffusion zone enters the magnet from the corresponding diffusion source covering surface and migrates inward along the grain boundaries between the magnet grains. After the grain boundary diffusion is completed, it is cooled under the protective atmosphere to obtain the magnet that has completed the grain boundary diffusion heat treatment.

[0091] Under the protective atmosphere, the magnet that has undergone grain boundary diffusion heat treatment is heated to a tempering temperature lower than the grain boundary diffusion treatment temperature and held, so that the diffusion elements distributed along the grain boundary are stably combined with the grain boundary structure of the magnet. Then, while maintaining the protective atmosphere, the magnet is cooled to room temperature, so that different grain boundary diffusion partitions form a grain boundary diffusion state that matches the corresponding anti-demagnetization requirements, and the partitioned grain boundary diffusion magnet corresponding to the anti-demagnetization requirements is obtained.

[0092] The beneficial effects are that by continuously maintaining the inner, outer, and circumferential orientations of the qualified zone-coated magnets during the transfer and heat treatment process, and keeping the diffusion source covering surface separate from the heat-treated carrier and adjacent magnets, it is possible to avoid contact damage, position confusion, and mutual adhesion of the diffusion source covering layer during the transfer and heat treatment process. This allows the diffusion source in each grain boundary diffusion zone to diffuse from the predetermined surface along the grain boundary inward, thereby ensuring that the grain boundary diffusion state of the zone corresponds to the anti-demagnetization requirements of each surface position and improving the processing consistency of the zone-diffused magnets.

[0093] Reference Figure 4 The diagram shown is a functional block diagram of an axial flux motor magnet partitioned grain boundary diffusion system provided in an embodiment of the present invention.

[0094] The axial flux motor magnet partitioned grain boundary diffusion system 100 of the present invention includes a magnet orientation calibration module 101, a partitioned diffusion control module 102, a magnet positioning module 103, a partitioned isolation feeding module 104, a coverage verification and compensation module 105, and a grain boundary diffusion processing module 106. Each module transmits data according to magnet orientation requirements, partitioned diffusion control information, and partitioned coverage verification results, and connects workpiece states according to the processing sequence of positioning magnets, partitioned coating magnets, and qualified partitioned coating magnets, so that the information or processing results output by the previous module serve as the execution basis for the next module. The grain boundary diffusion processing module 106 performs grain boundary diffusion heat treatment based on the magnet orientation requirements, maintaining the partitioned orientation of the qualified partitioned coated magnets.

[0095] In this embodiment, the functions of each module are as follows: The magnet orientation calibration module 101 is used to obtain the magnet surface contour, installation orientation and anti-demagnetization requirements of each surface position, determine the inner circumferential side, outer circumferential side and circumferential side according to the installation orientation, and associate each surface position with the anti-demagnetization requirements to obtain magnet orientation requirement information. The partition diffusion control module 102 is connected to the magnet orientation calibration module 101. It is used to divide the grain boundary diffusion partition according to the anti-demagnetization requirement based on the magnet orientation requirement information, determine the partition boundary and unit area feed of each grain boundary diffusion partition, and obtain partition diffusion control information. The magnet positioning module 103 is connected to the partition diffusion control module 102 and is used to align the inner circumferential side, the outer circumferential side and the circumferential side with the positioning reference, and to define the position and orientation of the magnet to obtain a positioning magnet corresponding to the orientation of the partition diffusion control information. The partition isolation feeding module 104 is connected to the magnet positioning module 103 and is used to sequentially isolate and feed each grain boundary diffusion partition of the positioning magnet according to the partition diffusion control information, so that the diffusion source attaches according to the corresponding unit area feeding amount, and obtains partition coated magnet. The coverage verification and compensation module 105 is connected to the partition isolation material supply module 104. It is used to verify the coverage boundary and coverage continuity of the partition coated magnet, remove the cross-boundary diffusion source, and compensate the uncovered area to obtain qualified partition coated magnet. The grain boundary diffusion treatment module 106 is connected to the coverage verification and compensation module 105. It is used to maintain the partition orientation of the qualified partition coated magnets and perform grain boundary diffusion heat treatment, so that the diffusion source diffuses inward along the grain boundary to obtain partition grain boundary diffusion magnets corresponding to the anti-demagnetization requirements.

[0096] In terms of data and control relationships, the magnet orientation calibration module 101 transmits the magnet orientation requirement information to the partition diffusion control module 102, which is then used by the magnet positioning module 103, the coverage verification and compensation module 105, and the grain boundary diffusion processing module 106. The partition diffusion control module 102 transmits partition diffusion control information to the magnet positioning module 103 and the partition isolation feeding module 104, which is then used by the coverage verification and compensation module 105 when determining the source partition and the compensation feeding amount. The magnet positioning module 103 will... The completion status and positioning magnet are transmitted to the partition isolation feeding module 104; the partition isolation feeding module 104 transmits the partition coating magnet to the coverage verification and compensation module 105. When there is an over-boundary coverage area or an uncovered area, the coverage verification and compensation module 105 outputs correction control information to the partition isolation feeding module 104. When the coverage is qualified, the qualified partition coating magnet is transmitted to the grain boundary diffusion processing module 106; the grain boundary diffusion processing module 106 only starts the grain boundary diffusion heat treatment after receiving the coverage qualified status.

[0097] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. A control method for a partitioned grain boundary diffusion system of an axial flux motor magnet, characterized in that, include: Step S1: Obtain the surface contour, installation orientation, and anti-demagnetization requirements of each surface position of the magnet. Determine the inner circumferential side, outer circumferential side, and circumferential side based on the installation orientation, and associate each surface position with the anti-demagnetization requirements to obtain the magnet orientation requirement information. Step S2: Based on the magnetic steel orientation requirement information, divide the grain boundary diffusion zones according to the anti-demagnetization requirement, determine the zone boundary and unit area material supply of each grain boundary diffusion zone, and obtain the zone diffusion control information. Step S3: Align the inner circumferential side, outer circumferential side, and circumferential side with the positioning reference, and define the position and orientation of the magnet to obtain the positioning magnet corresponding to the orientation of the partition diffusion control information; Step S4: According to the partitioned diffusion control information, the diffusion partitions of the positioning magnet are sequentially isolated and fed with materials so that the diffusion source is attached according to the corresponding unit area material supply amount, thereby obtaining the partitioned coated magnet. Step S5: Verify the coverage boundary and coverage continuity of the partitioned coated magnets, remove the cross-boundary diffusion sources, and compensate for the uncovered areas by feeding materials to obtain qualified partitioned coated magnets. Step S6: Maintain the orientation of the qualified partitioned coated magnet and perform grain boundary diffusion heat treatment to allow the diffusion source to diffuse inward along the grain boundary, thereby obtaining a partitioned grain boundary diffusion magnet that corresponds to the anti-demagnetization requirement.

2. The control method for the axial flux motor magnet partitioned grain boundary diffusion system according to claim 1, characterized in that, Step S1 includes: Obtain the surface profile of the magnet and the installation position of the magnet in the rotor of the axial flux motor; Based on the installation position, the side of the magnet closer to the center of the axial flux motor shaft is defined as the inner circumferential side, the side farther from the center of the shaft is defined as the outer circumferential side, and the two sides connecting the inner circumferential side and the outer circumferential side are defined as the circumferential side. Obtain the anti-demagnetization requirement distribution corresponding to the installation position, and map the anti-demagnetization requirement distribution to each surface position of the magnet according to the installation orientation; The anti-demagnetization requirements corresponding to each surface location are associated with the inner peripheral side, the outer peripheral side, and the circumferential side. By associating the surface profile, the installation orientation, and the anti-demagnetization requirements based on the location association, the magnetic steel orientation requirement information is obtained.

3. The control method for the axial flux motor magnet partitioned grain boundary diffusion system according to claim 1, characterized in that, Step S2 includes: The anti-demagnetization requirement in the magnetic steel orientation requirement information is mapped to the grain boundary diffusion surface of the magnetic steel; By comparing the anti-demagnetization requirements corresponding to adjacent surface locations, the locations where the anti-demagnetization requirements change are identified. A partition boundary is set along the location where the anti-demagnetization requirement changes, and the grain boundary diffusion surface is divided by the partition boundary to obtain multiple grain boundary diffusion partitions; Based on the anti-demagnetization requirements corresponding to each grain boundary diffusion zone, the unit area material supply of each grain boundary diffusion zone is determined from the correspondence between the anti-demagnetization requirements and the material supply per unit area. By associating each grain boundary diffusion zone, the corresponding zone boundary, and the feed rate per unit area, the diffusion control information of the zone is obtained.

4. The control method for the axial flux motor magnet partitioned grain boundary diffusion system according to claim 1, characterized in that, Step S3 includes: The magnet is placed at the magnet bearing position of the partitioned grain boundary diffusion system; The inner circumferential side of the magnet is brought into contact with the inner circumferential positioning reference to determine the inner circumferential orientation of the magnet. The circumferential side of the magnet is brought into contact with the circumferential positioning reference to determine the circumferential orientation of the magnet. The outer peripheral positioning reference is driven to abut against the outer peripheral side of the magnet, so that the surface contour of the magnet corresponds to the partition boundary in the partition diffusion control information. The magnet corresponding to the completed position is clamped to obtain the positioning magnet corresponding to the orientation of the partition diffusion control information.

5. The control method for the axial flux motor magnet partitioned grain boundary diffusion system according to claim 1, characterized in that, Step S4 includes: Extract the current grain boundary diffusion partition and its partition boundary from the partition diffusion control information; Adjust the opening position of the shielding component according to the partition boundary so that the opening edge of the shielding component corresponds to the partition boundary of the current grain boundary diffusion partition. The shielding element covers the grain boundary diffusion surface outside the current grain boundary diffusion zone; The current grain boundary diffusion partition is exposed through the opening of the shielding member, and the edge of the opening of the shielding member is made to fit against the grain boundary diffusion surface of the positioning magnet. The area defined by the opening of the shielding member is determined as the isolation feeding area corresponding to the current grain boundary diffusion partition.

6. The control method for the axial flux motor magnet partitioned grain boundary diffusion system according to claim 5, characterized in that, Step S4 further includes: The corresponding partition area is determined based on the partition boundary of the current grain boundary diffusion partition, and the unit area feed amount corresponding to the current grain boundary diffusion partition is extracted from the partition diffusion control information. The diffusion source supply quality of the current grain boundary diffusion zone is determined based on the partition area and the corresponding unit area feed rate. According to the quality of the diffusion source supply, the diffusion source is delivered to the isolation supply area corresponding to the current grain boundary diffusion zone; The feeding position is controlled to move sequentially along the boundary of the current grain boundary diffusion zone and inside the zone, so that adjacent feeding trajectories are continuously connected, and the diffusion source covering layer of the current grain boundary diffusion zone is obtained. After the diffusion source attachment of the current grain boundary diffusion zone is completed, the opening position of the shielding member is adjusted according to the partition boundary of the next grain boundary diffusion zone to obtain the isolation feeding area corresponding to the next grain boundary diffusion zone. The diffusion source is attached to each grain boundary diffusion zone in sequence to obtain the coated magnet.

7. The control method for the axial flux motor magnet partitioned grain boundary diffusion system according to claim 1, characterized in that, Step S5 includes: According to the required magnet orientation information, place the partition-coated magnets at the coverage inspection position; The grain boundary diffusion surface of the partitioned magnet is directionally illuminated, and surface images of each grain boundary diffusion partition are acquired. The actual coverage area of ​​each grain boundary diffusion zone is determined based on the image difference between the diffusion source-covered surface and the exposed magnet surface. Extract the outer perimeter of the actual coverage area to obtain the actual coverage boundary, and compare the position of the actual coverage boundary with the corresponding partition boundary to obtain the out-of-bounds coverage area; Within the partition boundaries of each grain boundary diffusion zone, the regions separated by the exposed magnet surface are determined, thus obtaining the uncovered regions; The over-boundary covered area and the uncovered area are associated with the corresponding grain boundary diffusion partition to obtain the partition coverage verification result.

8. The control method for the axial flux motor magnet partitioned grain boundary diffusion system according to claim 7, characterized in that, Step S5 further includes: Extract the out-of-bounds coverage area from the partition coverage verification results, and determine the grain boundary diffusion partition corresponding to the out-of-bounds coverage area; The location for recovering the diffusion source is controlled to move along the over-boundary coverage area, and the diffusion source in the over-boundary coverage area is removed by negative pressure suction. Extract the uncovered areas from the partition coverage verification results and determine the grain boundary diffusion partition to which the uncovered areas belong; The isolation feeding area is re-formed according to the partition boundary of the grain boundary diffusion partition to which the uncovered area belongs, and the feeding position is moved to the uncovered area; Compensation is provided according to the unit area material supply of the grain boundary diffusion zone to which the uncovered area belongs, and the coverage boundary and coverage continuity are re-verified after compensation. Repeat the process of diffusion source removal, compensation feeding, and coverage verification until the actual coverage boundary of each grain boundary diffusion zone is located within the corresponding zone boundary and the zone is continuously covered, thus obtaining the qualified zone-coated magnet.

9. The control method for the axial flux motor magnet partitioned grain boundary diffusion system according to claim 1, characterized in that, Step S6 includes: According to the magnetic steel orientation requirements, the qualified partition coated magnetic steel is clamped so that the orientation of the inner circumferential side, the outer circumferential side, and the circumferential side remains unchanged during the transfer process; The qualified zone-coated magnet is placed on a heat treatment support with a corresponding orientation positioning position, so that the zone orientation of the qualified zone-coated magnet corresponds to the heat treatment support position. The diffusion source covering surface of each grain boundary diffusion zone is kept separate from the heat treatment support, and adjacent qualified zones are coated with magnets and placed at intervals. The heat-treated carrier bearing the qualified partitioned coated magnet is placed in a protective atmosphere for grain boundary diffusion heat treatment, so that the diffusion source in each grain boundary diffusion partition diffuses from the corresponding surface along the grain boundary of the magnet inward. The magnet that has undergone grain boundary diffusion heat treatment is tempered to obtain the partitioned grain boundary diffusion magnet that corresponds to the anti-demagnetization requirement.

10. A partitioned grain boundary diffusion system for axial flux motor magnets, characterized in that, A control method for implementing the axial flux motor magnet partitioned grain boundary diffusion system as described in claim 1 includes: The magnet orientation calibration module is used to obtain the magnet surface contour, installation orientation, and anti-demagnetization requirements of each surface position. Based on the installation orientation, the inner circumferential side, outer circumferential side, and circumferential side are determined, and each surface position is associated with the anti-demagnetization requirements to obtain the magnet orientation requirement information. The partition diffusion control module is used to divide the grain boundary diffusion partitions according to the anti-demagnetization requirements based on the magnetic steel orientation requirement information, determine the partition boundary and unit area feed of each grain boundary diffusion partition, and obtain partition diffusion control information. A magnet positioning module is used to align the inner circumferential side, the outer circumferential side, and the circumferential side with a positioning reference, and to define the position and orientation of the magnet, thereby obtaining a positioning magnet that corresponds to the orientation of the partition diffusion control information. The partitioned isolation feeding module is used to sequentially isolate and feed each grain boundary diffusion partition of the positioning magnet according to the partitioned diffusion control information, so that the diffusion source attaches according to the corresponding unit area feeding amount, and obtains partitioned coated magnet. The coverage verification and compensation module is used to verify the coverage boundary and coverage continuity of the partitioned coated magnets, remove the cross-boundary diffusion source, and compensate the uncovered area to obtain qualified partitioned coated magnets. The grain boundary diffusion treatment module is used to maintain the partition orientation of the qualified partitioned coated magnets and perform grain boundary diffusion heat treatment, so that the diffusion source diffuses inward along the grain boundary to obtain partitioned grain boundary diffused magnets corresponding to the anti-demagnetization requirements.

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