A method for processing sintered NdFeB spherical magnets

Abstract

This invention discloses a method for processing sintered NdFeB spherical magnets, comprising a body, which includes magnetic crown assemblies at both ends of the spherical magnet, a magnetic seat assembly in the middle of the spherical magnet, and a magnetic core at the central axis of the spherical magnet. The magnetic crown assembly includes an upper magnetic crown at the upper part of the spherical magnet and a lower magnetic crown at the lower part of the spherical magnet. The magnetic seat assembly includes an upper magnetic seat at the upper end of the middle part of the spherical magnet, a lower magnetic seat at the lower end of the middle part of the spherical magnet, and a mounting hole vertically disposed at the central axis of the magnetic seat assembly, with the magnetic core disposed within the mounting hole. This invention simplifies the processing of each component of the spherical magnet by dividing it into an upper magnetic crown, an upper magnetic seat, a magnetic core, a lower magnetic seat, and a lower magnetic crown, and enables mass production of large-sized spherical magnets through assembly.

Description

Technical Field

[0001] This invention relates to the field of magnetic material processing technology, and in particular to a method for processing sintered NdFeB spherical magnets. Background Technology

[0002] Neodymium iron boron (NdFeB) permanent magnets possess excellent properties such as high remanence, high coercivity, and high energy product. They are also easily processed into magnets of various shapes and specifications, making them widely used in permanent magnetic field devices and equipment in electroacoustics, telecommunications, motors, instruments, nuclear magnetic resonance, magnetic levitation, and magnetic sealing. They are particularly suitable for manufacturing various high-performance, complex-shaped products. The production process of sintered NdFeB includes steps such as batching, melting, hydrogen crushing, air jet milling, forming, and sintering, resulting in a magnetic material blank with certain magnetic properties. The processing of sintered NdFeB involves processing this blank through various grinding, cutting, and surface treatment processes to create the finished product. With the application of sintered NdFeB in fields such as medicine, a high-precision NdFeB spherical magnet has been designed and put into use. However, the problem is that the blank shape is mostly square, cylindrical, or ring-shaped, and processing mainly involves cutting and grinding. Due to the difficulty of operation during processing, the existing direct processing methods for spherical magnets are not currently used for mass production when the size of the spherical magnet is too large. Summary of the Invention

[0003] To address the shortcomings and defects of existing technologies, a processing method for sintered NdFeB spherical magnets is provided. Through multiple processing steps using different profile grinding, the tolerance design requirements are met, enabling mass production. The use of adhesive fixing fixtures further stabilizes the spherical magnets during the fixing process.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a method for processing sintered NdFeB spherical magnets, comprising a body, the body comprising magnetic crown assemblies disposed at both ends of the spherical magnet, a magnetic seat assembly disposed in the middle of the spherical magnet, and a magnetic core disposed at the central axis of the spherical magnet, the magnetic assembly comprising an upper magnetic crown disposed at the upper part of the spherical magnet and a lower magnetic crown disposed at the lower part of the spherical magnet; the magnetic seat assembly comprising an upper magnetic seat at the upper end of the middle part of the spherical magnet, a lower magnetic seat at the lower end of the middle part of the spherical magnet, and a mounting hole vertically disposed at the central axis of the magnetic assembly, the magnetic core being disposed in the mounting hole.

[0005] By adopting the above technical solution, the spherical magnet is divided into an upper magnetic crown, an upper magnetic base, a magnetic core, a lower magnetic base, and a lower magnetic crown, which makes it easy to process each component of the spherical magnet. Through assembly, large-sized spherical magnets can also be mass-produced.

[0006] The processing steps for the magnetic crown assembly, magnetic base assembly, and magnetic core are as follows: S1: The upper and lower magnetic crowns are made from cylindrical blanks. After cutting off excess material, the outer surfaces of the upper and lower magnetic crowns are ground into arc surfaces using a first profile grinding machine; S2: The upper and lower magnetic bases are made from ring blanks. The inner and outer diameters are rough-fitted using a hole-forming machine. Mounting holes are formed at the central axis of the upper and lower magnetic bases. Excess material on the outer diameter of the upper and lower magnetic bases is cut off, and the outer surfaces of the upper and lower magnetic bases are ground into arc surfaces using a second profile grinding machine; S3: The magnetic core is made from a cylindrical blank through external cylindrical grinding and surface grinding to form a cylindrical magnet, and the magnetic core mates with the mounting holes; S4: The maximum diameter end of the upper magnetic crown is surface A, the maximum diameter end of the lower magnetic crown is surface B, and the minimum diameter end of the upper magnetic base is surface C. The largest diameter end of the base is surface D, the smallest diameter end of the lower magnet base is surface E, and the largest diameter end of the lower magnet base is surface F. Surfaces A and C are completely fitted and bonded together. Surfaces B and E are completely fitted and bonded together. The assembly formed by surfaces A and C, and surfaces B and E is ground using a third profile grinding process to make the surfaces at the connection points of surfaces A and C, and surfaces B and E, smooth. S5: The magnetic core is placed in the mounting hole. Surfaces D and F are completely fitted and bonded together. The spherical magnet formed is ground using a fourth profile grinding process to make the surface of the body smooth.

[0007] By adopting the above technical solution, the outer surfaces of the upper and lower magnetic crowns are machined into arc surfaces using a first profile grinding process; the outer surfaces of the upper and lower magnetic seats are machined into arc surfaces using a second profile grinding process. Surfaces A and C, and surfaces B and E are completely fitted and bonded together to form an assembly. Then, the surface of the assembly is ground to a smooth finish using a third profile grinding process. The magnetic core is placed in the mounting hole, with surfaces D and F completely fitted together. The spherical magnet is arranged from top to bottom as an upper magnetic crown, an upper magnetic seat, a lower magnetic seat, and a lower magnetic crown. Then, the surface of the body is ground to a smooth finish using a fourth profile grinding process. By using multiple profile grinding processes, the spherical magnet achieves high precision and good consistency, meets tolerance design requirements, and can be mass-produced.

[0008] The diameter of the smallest end of the first irregular mill increases sequentially to the diameter of the largest end of the first irregular mill, and the trajectory is a smooth arc.

[0009] By adopting the above technical solution, the minimum end diameter of the first irregular mill increases sequentially to the maximum end diameter of the first irregular mill, and the trajectory is a smooth arc, which makes the outer wall surface of the upper and lower magnetic crowns have good flatness when processing the upper and lower magnetic crowns.

[0010] The diameter of the smallest end of the second shaped mill increases sequentially to the diameter of the largest end of the second shaped mill, and the trajectory is a smooth arc.

[0011] By adopting the above technical solution, the minimum end diameter of the second shaped mill increases sequentially to the maximum end diameter of the first shaped mill, and the trajectory is a smooth arc, which makes the outer wall surface of the upper and lower magnetic seats have good flatness after processing.

[0012] The diameter of the smallest end of the first shaped mill is the same as the diameter of the largest end of the second shaped mill. The trajectory from the smallest end of the third shaped mill to the largest end of the third shaped mill is an arc. The diameter of the smallest end of the third shaped mill is the same as the diameter of the smallest end of the second shaped mill. The diameter of the largest end of the third shaped mill is the same as the diameter of the largest end of the first shaped mill.

[0013] By adopting the above technical solution, after surface A and surface C are fixed together with glue, and surface B and surface E are fixed together with glue, due to the partial displacement between surface A and surface C and between surface B and surface E during assembly, surface A and surface C, as well as surface B and surface E, are ground with a third profile grinder to make the joint between surface A and surface C, and the joint between surface B and surface E smooth and flat.

[0014] The connection between the fourth profile mill and the main body is an arc, and the diameter of the arc is the same as the diameter of the main body. The length of the arc is greater than the axial arc length of the outer wall surface of the upper and lower magnetic bases.

[0015] By adopting the above technical solution, the diameter of the arc of the fourth profile mill is the same as the diameter of the required body, and the length of the arc is greater than the axial arc length of the outer wall of the upper and lower magnetic seats. This makes the various joints of the body smooth, flat and highly consistent when the fourth profile mill processes the body.

[0016] The fixing step includes an adhesive fixture for assisting in fixing the main body. The adhesive fixture includes a first fixture for fixing the upper magnetic crown and the upper magnetic base, and for fixing the lower magnetic crown and the lower magnetic base. The first fixture includes a first base, two support bars fixed on the first base and arranged opposite each other, and a pressure plate fixed on the support bars. The two sides of the pressure plate are respectively fixed on the support bars. Surface A and surface C, and surface B and surface E are connected by glue. Surface D and surface F are located on the first base. The crown tops of the upper and lower magnetic crowns abut against one end face of the pressure plate.

[0017] By adopting the above technical solution, during the fixing process between the upper magnetic crown and the upper magnetic seat, and during the fixing process between the lower magnetic crown and the lower magnetic seat, the relative positions of the upper magnetic crown and the upper magnetic seat are fixed by the first tooling, and the relative positions of the upper magnetic crown and the upper magnetic seat, as well as the relative positions of the lower magnetic crown and the lower magnetic seat, are fixed by the first tooling, so as to prevent the magnet from shifting due to the flow of glue.

[0018] The adhesive fixture includes a second fixture for fixing the main body as a whole. The second fixture includes a second base, several support columns on the base, and an upper cover fixed to the other end of the support columns. When the magnetic crown assembly, magnetic base assembly, and magnetic core are assembled into a spherical magnet, the minimum diameter of the upper magnetic crown is abutted at the center of the upper cover, and the crown top of the lower magnetic crown located at the bottom of the spherical magnet abuts at the center of the second base.

[0019] By adopting the above technical solution, the magnetic crown assembly, magnetic base assembly, and magnetic core are fixed by the second tooling, so that during the process of splicing the magnetic crown assembly, magnetic base assembly, and magnetic core into a spherical magnet, the relative position between the D side and the E side during splicing is prevented from changing due to the flow of glue.

[0020] The lower magnetic crown is provided with a first groove at the connection between the lower magnetic crown and the second base, and the lower magnetic crown is located in the first groove. The upper magnetic crown is provided with a second groove at the connection between the upper magnetic crown and the upper cover, and the upper magnetic crown is located in the second groove.

[0021] By adopting the above technical solution, the inner wall of the first groove abuts against the outer wall of the lower magnetic crown, and the inner wall of the second groove abuts against the outer wall of the upper magnetic crown, thus preventing the body from rotating.

[0022] The second tooling includes several clamping plates located on the inner end of the second base. The clamping plates are arranged circumferentially along the central axis of the second base. Each clamping plate includes an arc-shaped portion close to the main body, and the arc-shaped portion cooperates with the outer wall of the main body to restrict the horizontal movement of the main body.

[0023] By adopting the above technical solution, the card plate is arranged circumferentially along the central axis of the second base, and the card plate includes an arc-shaped part close to the body. The arc-shaped part restricts the horizontal movement of the body by abutting against the outer wall surface of the body, preventing the relative position of each magnet from moving during the glue fixing process. Attached Figure Description

[0024] Figure 1 This is a schematic cross-sectional view of the spherical magnet of the present invention;

[0025] Figure 2 This is a schematic diagram of the structure of the magnetic crown assembly and magnetic base assembly of the present invention in cooperation;

[0026] Figure 3 This is a schematic diagram of the structure of the upper magnetic crown cooperating with the three-jaw chuck of the present invention;

[0027] Figure 4 This is a schematic diagram of the structure of the lower magnetic crown and the three-jaw chuck of the present invention;

[0028] Figure 5 This is a schematic diagram of the structure of the first irregular mill of the present invention;

[0029] Figure 6This is a schematic diagram of the structure of the upper magnetic base, the fixed base, and the fixing nut of the present invention.

[0030] Figure 7 This is a schematic diagram of the structure of the lower magnetic base, the fixed base, and the fixing nut of the present invention.

[0031] Figure 8 This is a schematic diagram of the structure of the fixing base and fixing nut of the present invention;

[0032] Figure 9 This is a schematic diagram of the structure of the second profiled mill of the present invention;

[0033] Figure 10 This is a schematic diagram of the structure of the upper magnetic crown, upper magnetic base, and fixed base of the present invention.

[0034] Figure 11 This is a schematic diagram of the structure of the lower magnetic crown, lower magnetic base, and fixed base of the present invention.

[0035] Figure 12 This is a schematic diagram of the structure of the third profiled mill of the present invention;

[0036] Figure 13 This is a schematic diagram of the structure of the spherical magnet and the three-jaw chuck of the present invention.

[0037] Figure 14 This is a schematic diagram of the structure of the fourth profiled mill of the present invention;

[0038] Figure 15 This is a schematic diagram of the structure of the first tooling of the present invention in conjunction with the upper magnetic base and the upper magnetic crown;

[0039] Figure 16 This is a schematic diagram of the structure of the first tooling of the present invention in conjunction with the lower magnetic base and the lower magnetic crown;

[0040] Figure 17 This is a schematic diagram of the structure of the second tooling of the present invention in conjunction with the spherical magnet;

[0041] Figure 18 This is a cross-sectional schematic diagram of the second tooling of the present invention in conjunction with a spherical magnet.

[0042] In the diagram: 1. Magnetic crown assembly; 1.1. Upper magnetic crown; 1.1.1. Surface A; 1.2. Lower magnetic crown; 1.2.1. Surface B; 2. Magnetic base assembly; 2.1. Upper magnetic base; 2.1.1. Surface C; 2.1.2. Surface D; 2.2. Lower magnetic base; 2.2.1. Surface E; 2.2.2. Surface F; 2.3. Mounting hole; 3. Magnetic core; 4. First irregular mill; 5. Second irregular mill; 6. Third irregular mill; 7. 8. First tooling; 8.1 First base; 8.2 Support bar; 8.3 Pressure plate; 9. Second tooling; 9.1 Second base; 9.1.1 First groove; 9.2 Support column; 9.3 Top cover; 9.3.1 Second groove; 9.4 Clamping plate; 9.4.1 Arc-shaped part; 10. Three-jaw chuck; 11. Fixed seat; 11.1 Mounting bolt; 12. Fixing nut. Detailed Implementation

[0043] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0044] Please see Figure 1-18 The present invention discloses a method for processing sintered NdFeB spherical magnets, comprising a body, the body comprising magnetic crown assemblies 1 disposed at both ends of the spherical magnet, magnetic seat assembly 2 disposed in the middle of the spherical magnet, and magnetic core 3 disposed at the central axis of the spherical magnet. The magnetic crown assembly 1 comprises an upper magnetic crown 1.1 disposed at the upper part of the spherical magnet and a lower magnetic crown 1.2 disposed at the lower part of the spherical magnet. The magnetic seat assembly 2 comprises an upper magnetic seat 2.1 at the upper end of the middle of the spherical magnet, a lower magnetic seat 2.2 at the lower end of the middle of the spherical magnet, and a mounting hole 2.3 vertically disposed at the central axis of the magnetic seat assembly 2. The magnetic core 3 is disposed in the mounting hole 2.3.

[0045] The technical solutions in the above embodiments of this application have at least the following technical effects and advantages: the spherical magnet is divided into an upper magnetic crown 1.1, an upper magnetic base 2.1, a magnetic core 3, a lower magnetic base 2.2, and a lower magnetic crown 1.2, which makes it easy to process each part of the spherical magnet, and enables the mass production of large-sized spherical magnets through assembly.

[0046] A method for processing sintered NdFeB spherical magnets includes a body, the processing materials of which include cylindrical blanks and annular blanks. The body includes an upper magnetic crown 1.1, a lower magnetic crown 1.2, an upper magnetic seat 2.1, a lower magnetic seat 2.2, and a magnetic core 3. The processing equipment includes a first profile mill 4, a second profile mill 5, a third profile mill 6, a fourth profile mill 7, a hole punching machine, an EDM machine, a centerless mill, an internal grinding mill, an external grinding mill, and a surface grinding mill, as well as a three-jaw chuck 10, a fixing seat 11, a mounting nut, and adhesive for fixing the magnets. The specific processing steps of the body are as follows:

[0047] S1: The upper magnetic crown 1.1 and the lower magnetic crown 1.2 are made by cutting off the excess material from the cylindrical blank using an electric discharge wire cutting machine, leaving a margin. The first profile grinding machine 4 is used, and the cylindrical table is positioned using a three-jaw chuck 10. The arc surface is ground, leaving a margin of 0.5mm, so that the upper magnetic crown 1.1 and the lower magnetic crown 1.2 are hemispherical magnets with spherical ends.

[0048] S2: The upper magnetic seat 2.1 and the lower magnetic seat 2.2 are made from a circular ring blank. The outer diameter D151mm and the inner diameter D49.5mm are rough-fitted using a bushing machine. The outer diameters of the upper magnetic seat 2.1 and the lower magnetic seat 2.2 are then used for positioning. The inner diameters of the upper magnetic seat 2.1 and the lower magnetic seat 2.2 are machined using an internal grinding machine to form through holes. These holes are then used for positioning, and the upper magnetic seat 2.1 and the lower magnetic seat 2.2 are placed on a fixed base 11. The fixed base 11 is equipped with mounting bolts 11.1. The inner hole mates with the mounting bolt 11.1. The fixing nut 12 is tightened on the outer side of the upper magnetic seat 2.1 and the lower magnetic seat 2.2. Then, the outer diameter of the upper magnetic seat 2.1 and the lower magnetic seat 2.2 is ground to D150.5mm using an external cylindrical grinding machine. The excess material on the outer diameter of the upper magnetic seat 2.1 and the lower magnetic seat 2.2 is cut off by wire electrical discharge machining, leaving a margin. Then, the outer surface of the upper magnetic seat 2.1 and the lower magnetic seat 2.2 is ground into an arc surface by a second profile grinding machine 5, leaving a margin of 0.5mm, so that the upper magnetic seat 2.1 and the lower magnetic seat 2.2 are magnets located in the middle of the sphere.

[0049] S3: The magnetic core 3 is made from a cylindrical blank with a diameter of D51mm×101mm. The outer diameter is ground to D50mm using a centerless grinder, and then ground to 100mm using an end face grinder to form a cylindrical magnet. The magnetic core 3 is matched with the through hole of the mounting hole 2.3.

[0050] S4: The maximum diameter end of the upper magnetic crown 1.1 is surface A 1.1.1, the maximum diameter end of the lower magnetic crown 1.2 is surface B 1.2.1, the minimum diameter end of the upper magnetic base 2.1 is surface C 2.1.1, the maximum diameter end of the upper magnetic base 2.1 is surface D 2.1.2, the minimum diameter end of the lower magnetic base 2.2 is surface E 2.2.1, the maximum diameter end of the lower magnetic base 2.2 is surface F 2.2.2, and surfaces A 1.1.1 and C 2.1.1 are completely in contact. The parts are then joined and bonded together. Surface B 1.2.1 and Surface E 2.2.1 are fully bonded together and fixed with glue. After high-temperature curing, the assemblies formed by Surface A 1.1.1 and Surface C 2.1.1, as well as Surface B 1.2.1 and Surface E 2.2.1, are ground to SD150mm using a third profile grinder to make the surfaces at the joints of Surface A 1.1.1 and Surface C 2.1.1, and Surface B 1.2.1 and Surface E 2.2.1, smooth.

[0051] S5: The magnetic core 3 is placed in the mounting hole 2.3. The D surface 2.1.2 and the F surface 2.2.2 are completely attached and fixed with glue. After high temperature curing, the spherical magnet formed is fixed by the three-jaw chuck 10. Then, the surface of the body is ground to SD150mm by the fourth profile grinder to make the surface flat.

[0052] The technical solutions described in the above embodiments of this application have at least the following technical effects and advantages: the outer surfaces of the upper magnetic crown 1.1 and the lower magnetic crown 1.2 are machined into arc surfaces using the first profile grinder 4; the outer surfaces of the upper magnetic base 2.1 and the lower magnetic base 2.2 are machined into arc surfaces using the second profile grinder 5; surface A 1.1.1 and surface C 2.1.1, and surface B 1.2.1 and surface E 2.2.1 are completely fitted and bonded together; then surface A 1.1.1 and surface C 2.1 are ground using the third profile grinder. 1. The surface of the assembly formed by surface B 1.2.1 and surface E 2.2.1 is made flat; the magnetic core 3 is set in the mounting hole 2.3, surface D 2.1.2 and surface F 2.2.2 are completely attached, and the spherical magnet is set with upper magnetic crown 1.1, upper magnetic seat 2.1, lower magnetic seat 2.2 and lower magnetic crown 1.2 in sequence from top to bottom. Then, the surface of the body is ground to flat using a fourth profile grinding machine. Multiple profile grinding machines are used to make the spherical magnet have high precision and good consistency, meet the tolerance design requirements, and can be mass-produced.

[0053] The diameter of the smallest end of the first irregular mill 4 increases sequentially to the diameter of the largest end of the first irregular mill 4, and the trajectory is a smooth arc.

[0054] The technical solutions in the above embodiments of this application have at least the following technical effects and advantages: the minimum end diameter of the first irregular mill 4 increases sequentially to the maximum end diameter of the first irregular mill 4, and the trajectory is a smooth arc, so that when processing the upper magnetic crown 1.1 and the lower magnetic crown 1.2, the outer wall surface of the upper magnetic crown 1.1 and the lower magnetic crown 1.2 has good flatness.

[0055] The diameter of the smallest end of the second irregular mill 5 increases sequentially to the diameter of the largest end of the second irregular mill 5, and the trajectory is a smooth arc.

[0056] The technical solutions in the above embodiments of this application have at least the following technical effects and advantages: the minimum end diameter of the second irregular mill 5 to the maximum end diameter of the first irregular mill 4 increases sequentially, and the trajectory is a smooth arc, so that after processing the upper magnetic seat 2.1 and the lower magnetic seat 2.2, the outer wall surface of the upper magnetic seat 2.1 and the lower magnetic seat 2.2 has good flatness.

[0057] The diameter of the smallest end of the first irregular mill 4 is the same as the diameter of the largest end of the second irregular mill 5. The trajectory from the smallest end of the third irregular mill 6 to the largest end of the third irregular mill 6 is an arc. The diameter of the smallest end of the third irregular mill 6 is the same as the diameter of the smallest end of the second irregular mill 5. The diameter of the largest end of the third irregular mill 6 is the same as the diameter of the largest end of the first irregular mill 4.

[0058] The technical solutions in the above embodiments of this application have at least the following technical effects and advantages: When surface A 1.1.1 and surface C 2.1.1 are bonded and fixed together with glue, and surface B 1.2.1 and surface E 2.2.1 are bonded and fixed together with glue, due to partial displacement between surface A 1.1.1 and surface C 2.1.1 and between surface B 1.2.1 and surface E 2.2.1 during assembly, the assembly formed by surface A 1.1.1 and surface C 2.1.1 and between surface B 1.2.1 and surface E 2.2.1 is ground using a third profile grinder 6, so that the joint between surface A 1.1.1 and surface C 2.1.1 and the joint between surface B 1.2.1 and surface E 2.2.1 is ground to be smooth and flat.

[0059] The connection between the fourth shaped mill 7 and the main body is an arc, and the diameter of the arc meets SD150mm. The length of the arc is greater than the axial arc length of the outer wall surface of the upper magnetic seat 2.1 and the lower magnetic seat 2.2.

[0060] The technical solutions in the above embodiments of this application have at least the following technical effects and advantages: the diameter of the arc of the fourth profile mill 7 meets SD150, and the length of the arc is greater than the axial arc length of the outer side wall of the upper magnetic seat 2.1 and the lower magnetic seat 2.2, so that when the fourth profile mill 7 processes the body, the various joints of the body are smooth and flat with high consistency.

[0061] The fixing step includes an adhesive fixture to assist in fixing the main body. The adhesive fixture includes a first fixture 8 for fixing the upper magnetic crown 1.1 and the upper magnetic base 2.1, and for fixing the lower magnetic crown 1.2 and the lower magnetic base 2.2. The first fixture 8 includes a first base 8.1, two support bars 8.2 fixed to the first base 8.1 and arranged opposite each other, and a pressure plate 8.3 fixed to the support bars 8.2. The two sides of the pressure plate 8.3 are respectively fixed to the support bars 8.2. Surface A 1.1.1 and surface C 2.1.1, and surface B 1.2.1 and surface E 2.2.1 are connected by glue. Surface D 2.1.2 and surface F 2.2.2 are set on the first base 8.1. The crown tops of the upper magnetic crown 1.1 and the lower magnetic crown 1.2 abut against one end face of the pressure plate 8.3.

[0062] The technical solutions in the above embodiments of this application have at least the following technical effects and advantages: during the fixing process between the upper magnetic crown 1.1 and the upper magnetic seat 2.1, and during the fixing process between the lower magnetic crown 1.2 and the lower magnetic seat 2.2, the relative positions of the upper magnetic crown 1.1 and the upper magnetic seat 2.1, and the relative positions of the lower magnetic crown 1.2 and the lower magnetic seat 2.2 are fixed by the first tooling 8, so as to prevent the magnet from shifting due to the flow of glue.

[0063] The adhesive fixture includes a second fixture 9 for fixing the main body as a whole. The second fixture 9 includes a second base 9.1, a plurality of support columns 9.2 provided on the base, and an upper cover 9.3 fixed to the other end of the support columns 9.2. When the magnetic crown assembly 1, the magnetic base assembly 2, and the magnetic core 3 are spliced ​​into a spherical magnet, the crown top of the upper magnetic crown 1.1 abuts against the center of the upper cover 9.3, and the crown top of the lower magnetic crown 1.2 located at the bottom of the spherical magnet abuts against the center of the second base 9.1.

[0064] The technical solutions in the above embodiments of this application have at least the following technical effects and advantages: by fixing the magnetic crown assembly 1, the magnetic base assembly 2, and the magnetic core 3 with the second tooling 9, the relative positions between surface D 2.1.2 and surface F 2.2.2 during splicing are prevented from changing due to glue flow during the splicing process of splicing the magnetic crown assembly 1, the magnetic base assembly 2, and the magnetic core 3 into spherical magnets.

[0065] The second tooling 9 includes three clamping plates 9.4 located on the inner end of the second base 9.1. The three clamping plates 9.4 are arranged circumferentially along the central axis of the second base 9.1, and the distance between adjacent clamping plates 9.4 is the same. Each clamping plate 9.4 includes an arc-shaped portion 9.4.1 close to the body, and the arc-shaped portion 9.4.1 cooperates with the outer wall of the body to restrict the horizontal movement of the body.

[0066] The technical solutions in the above-described embodiments of this application have at least the following technical effects and advantages: three card plates 9.4 are arranged circumferentially along the central axis of the second base 9.1, and the distance between adjacent card plates 9.4 is the same. Each of the three card plates 9.4 includes an arc-shaped portion 9.4.1 close to the body. The arc-shaped portion 9.4.1 restricts the horizontal movement of the body by abutting against the outer wall surface of the body, preventing the relative position of each magnet from moving during the glue fixing process.

[0067] The lower magnetic crown 1.2 is provided with a first groove 9.1.1 at the connection between it and the second base 9.1, and the lower magnetic crown 1.2 is located in the first groove 9.1.1. The upper magnetic crown 1.1 is provided with a second groove 9.3.1 at the connection between it and the upper cover 9.3, and the upper magnetic crown 1.1 is located in the second groove 9.3.1.

[0068] The technical solutions in the above embodiments of this application have at least the following technical effects and advantages: the inner wall of the first groove 9.1.1 abuts against the outer wall of the lower magnetic crown 1.2, and the inner wall of the second groove 9.3.1 abuts against the outer wall of the upper magnetic crown 1.1, preventing the body from rotating.

[0069] The above description only illustrates the preferred embodiments of the present invention and should not be construed as limiting the scope of the claims. The present invention is not limited to the above embodiments, and variations in its specific structure are permitted. All modifications made within the scope of the independent claims of this invention are also within the scope of protection of this invention.

Claims

1. A method for processing sintered NdFeB spherical magnets, comprising a body, characterized in that: The main body includes magnetic crown assemblies (1) at both ends of the spherical magnet, magnetic base assembly (2) in the middle of the spherical magnet, and magnetic core (3) at the central axis of the spherical magnet. The magnetic crown assembly (1) includes an upper magnetic crown (1.1) at the upper part of the spherical magnet and a lower magnetic crown (1.2) at the lower part of the spherical magnet. The magnetic base assembly (2) includes an upper magnetic base (2.1) at the upper end of the middle of the spherical magnet, a lower magnetic base (2.2) at the lower end of the middle of the spherical magnet, and a mounting hole (2.3) vertically located at the central axis of the magnetic base assembly (2). The magnetic core (3) is located in the mounting hole (2.3). The processing steps for the magnetic crown assembly (1), magnetic base assembly (2), and magnetic core (3) are as follows: S1: The upper magnetic crown (1.1) and lower magnetic crown (1.2) are formed by grinding the outer surfaces of the upper magnetic crown (1.1) and lower magnetic crown (1.2) into arc surfaces by cutting off excess material from the cylindrical blank and using the first profile grinding mill (4); S2: The upper magnetic seat (2.1) and lower magnetic seat (2.2) are formed by roughing the inner and outer diameters of the ring blank through a hole-forming machine, machining the central axis of the upper magnetic seat (2.1) and lower magnetic seat (2.2) to form mounting holes (2.3), cutting off the excess material on the outer diameter of the upper magnetic seat (2.1) and lower magnetic seat (2.2), and grinding the outer surfaces of the upper magnetic seat (2.1) and lower magnetic seat (2.2) into arc surfaces by a second profile grinding machine (5). S3: The magnetic core (3) is made from a cylindrical blank by external cylindrical grinding and surface grinding into a cylindrical magnet, and the magnetic core (3) is matched with the mounting hole (2.3); S4: The maximum diameter end of the upper magnetic crown (1.1) is surface A (1.1.1), the maximum diameter end of the lower magnetic crown (1.2) is surface B (1.2.1), the minimum diameter end of the upper magnetic base (2.1) is surface C (2.1.1), the maximum diameter end of the upper magnetic base (2.1) is surface D (2.1.2), the minimum diameter end of the lower magnetic base (2.2) is surface E (2.2.1), the maximum diameter end of the lower magnetic base (2.2) is surface F (2.2.2), and surface A (1.1.1) is surface C (2.1.1). 1.1) The surface of surface B (1.2.1) is completely adhered to and fixed to surface C (2.1.1). The surface of surface B (1.2.1) is completely adhered to and fixed to surface E (2.2.1). The assembly formed by surface A (1.1.1) and surface C (2.1.1), and surface B (1.2.1) and surface E (2.2.1) is ground by a third profile grinder (6) to make the surfaces of the connection between surface A (1.1.1) and surface C (2.1.1), and the connection between surface B (1.2.1) and surface E (2.2.1) flat. S5: The magnetic core (3) is placed in the mounting hole (2.3), and the D surface (2.1.2) and F surface (2.2.2) are completely attached and fixed together. The spherical magnet formed is ground to a flat surface by the fourth profile grinder (7).

2. The processing method of sintered NdFeB spherical magnets according to claim 1, characterized in that: The diameter of the smallest end of the first shaped mill (4) increases sequentially to the diameter of the largest end of the first shaped mill (4), and the trajectory is an arc.

3. The processing method of sintered NdFeB spherical magnets according to claim 2, characterized in that: The diameter of the second irregular mill (5) increases sequentially from the smallest end to the largest end, and the trajectory is an arc.

4. The processing method of sintered NdFeB spherical magnets according to claim 3, characterized in that: The diameter of the smallest end of the first shaped mill (4) is the same as the diameter of the largest end of the second shaped mill (5). The trajectory from the smallest end of the third shaped mill (6) to the largest end of the third shaped mill (6) is an arc. The diameter of the smallest end of the third shaped mill (6) is the same as the diameter of the smallest end of the second shaped mill (5). The diameter of the largest end of the third shaped mill (6) is the same as the diameter of the largest end of the first shaped mill (4).

5. The processing method of sintered NdFeB spherical magnets according to claim 1, characterized in that: The connection between the fourth shaped mill (7) and the main body is an arc, and the diameter of the arc is the same as the diameter of the main body. The length of the arc is greater than the axial arc length of the outer wall surface of the upper magnetic seat (2.1) and the lower magnetic seat (2.2).

6. The processing method of sintered NdFeB spherical magnets according to claim 1, characterized in that: The bonding and fixing steps of surface A (1.1.1) and surface C (2.1.1) and surface B (1.2.1) and surface E (2.2.1) include an adhesive fixture to assist in fixing the main body. The adhesive fixture includes a first fixture (8) for fixing the upper magnetic crown (1.1) and the upper magnetic base (2.1) and for fixing the lower magnetic crown (1.2) and the lower magnetic base (2.2). The first fixture (8) includes a first base (8.1) and two support bars (8.2) fixed to the first base (8.1) and arranged opposite to each other. The first base (8.1) and the pressure plate (8.3) fixed on the support bar (8.2), with the two sides of the pressure plate (8.3) fixed on the support bar (8.2); the A surface (1.1.1) and the C surface (2.1.1), as well as the B surface (1.2.1) and the E surface (2.2.1) are connected by glue; the D surface (2.1.2) and the F surface (2.2.2) are provided on the first base (8.1); the crown tops of the upper magnetic crown (1.1) and the lower magnetic crown (1.2) abut against one end face of the pressure plate (8.3).

7. The processing method of sintered NdFeB spherical magnets according to claim 6, characterized in that: The adhesive tooling includes a second tooling (9) for fixing the main body as a whole. The second tooling (9) includes a second base (9.1), a plurality of support columns (9.2) provided on the base, and an upper cover (9.3) fixed to the other end of the support columns (9.2). When the magnetic crown assembly (1), magnetic base assembly (2), and magnetic core (3) are spliced ​​into a spherical magnet, the crown top of the upper magnetic crown (1.1) abuts against the center of the upper cover (9.3), and the crown top of the lower magnetic crown (1.2) located at the bottom of the spherical magnet abuts against the center of the second base (9.1).

8. The processing method of sintered NdFeB spherical magnets according to claim 7, characterized in that: The lower magnetic crown (1.2) and the second base (9.1) are provided with a first groove at the connection point. 9.1.1), the lower magnetic crown (1.2) is disposed in the first groove (9.1.1), and the connection between the upper magnetic crown (1.1) and the upper cover (9.3) is provided with a second groove ( 9.3.1), the upper magnetic crown (1.1) is disposed in the second groove (9.3.1).

9. The processing method of sintered NdFeB spherical magnets according to claim 7, characterized in that: The second tooling (9) includes several clamping plates (9.4) disposed on the inner end of the second base (9.1). The clamping plates (9.4) are arranged circumferentially along the central axis of the second base (9.1). The clamping plates (9.4) include an arc-shaped portion (9.4.1) close to the body, and the arc-shaped portion (9.4.1) cooperates with the outer wall of the body to restrict the horizontal movement of the body.

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