A method for manufacturing a magnetic circuit structure of a Halbach magnetic component

Abstract

The invention discloses a manufacturing method of a magnetic circuit structure of a Halbach magnetic component. The method comprises the following steps: firstly cutting a NdFeB blank block into a main magnet and a guide magnet, processing an inner hole on the main magnet, wherein the shape of the inner hole is the same as that of the guide magnet, then electroplating copper on the surface of the main magnet and then chemically plating nickel, then performing multi-stage magnetization on the main magnet, then electroplating nickel-copper-nickel on the surface of the guide magnet, and then performing single-pole magnetization on the guide magnet; then gluing the bottom surface of the main magnet to a patch, and finally embedding the guide magnet into the inner hole with the help of a guide tooling. The guide tooling can overcome the repulsive force encountered when the guide magnet is just embedded into the inner hole. When the guide magnet is embedded to a depth of 40-50% of the inner hole, the repulsive force is converted into a downward adsorption force, and the guide magnet is adsorbed to the bottom of the inner hole. The manufacturing method of the invention can greatly reduce the assembly difficulty of the Halbach magnetic component, and has a high assembly qualification rate and low cost.

Description

Technical Field

[0001] The invention belongs to the technical field of magnet processing and preparation, and in particular relates to a method for manufacturing a magnetic circuit structure of a Halbach magnetic component. Background Art

[0002] Halbach magnetic circuit has multiple advantages such as magnetic concentration and self-shielding. In particular, the characteristic of magnetic concentration can achieve a magnetic force or suction force several times higher than that of ordinary magnets of the same volume. Halbach magnetic components prepared with Halbach magnetic circuit structure have been widely used in magnetic attraction, motors, magnetic transmission, scientific research and other fields. At present, most of Halbach magnetic components are glued together by gluing multiple single-polarity magnets with different magnetization directions according to the requirements of the magnetic circuit structure. The structure is as follows: Figure 1 As shown, this is because anisotropy is the basis of strong magnetic materials, that is, there is only one direction that is the magnetization direction. At present, some bonded magnets can achieve one-piece magnetization that approximates the Halbach magnetic circuit, but this type of magnet itself has low magnetic properties and is an isotropic material. The mainstream is still the Halbach magnetic assembly through gluing.

[0003] The current mainstream process is to glue together multiple magnets with different magnetization directions according to the requirements of the magnetic circuit structure. However, according to the Halbach magnetic circuit structure, the polarity of each adjacent magnet is different and repulsive to each other. When multiple magnets with different polarities are arranged according to the Halbach magnetic circuit, the repulsive force is greater and it is very easy to adsorb together in a disorderly manner. Therefore, when gluing, it is necessary to find a way to overcome the repulsive force between each other, otherwise it will not be possible to form a qualified Halbach magnetic component. Therefore, a large number of jigs are required in the assembly process to achieve positioning, extrusion, pressure holding and other actions. The investment cost of the jigs is too high. The use of a large number of jigs is also prone to derivative problems. For example, the magnet surface is easily scratched during the extrusion process and the jig is accidentally glued due to overflow glue. The jig needs to be de-glueed. The glue also needs excessive investment to fill the bonding gap and strengthen the bonding strength. Even if a large amount of glue is used for bonding, it is still inevitable that there will be poor debonding. The above problems make the assembly process of Halbach magnetic components complicated and cumbersome, with high cost and low pass rate, and become the bottleneck of the entire Halbach magnetic component process industry. Summary of the invention

[0004] The object of the present invention is to provide a method for manufacturing a magnetic circuit structure of a Halbach magnetic component, which greatly reduces the difficulty of assembling the Halbach magnetic component, and has a high assembly qualification rate and low cost.

[0005] To achieve the above object, the present invention provides a method for manufacturing a magnetic circuit structure of a Halbach magnetic component, comprising the following steps:

[0006] S1. Use multi-wire cutting to cut the NdFeB blank into main magnets;

[0007] S2. Processing an inner hole on the main magnet that passes through the main magnet from top to bottom;

[0008] S3, electroplating copper and then chemically plating nickel on the surface of the main magnet;

[0009] S4, multi-stage magnetization is performed on the main magnet, and both sides of the top and bottom surfaces of the main magnet have two magnetic poles with opposite magnetic properties, and the two magnetic poles corresponding to the top and bottom surfaces have opposite polarities, and the magnetic pole dividing lines of the top and bottom surfaces of the main magnet are both located at the center line of the inner hole;

[0010] S5, cutting the NdFeB blank block into guide magnets, the size of the guide magnets being the same as the size of the inner hole;

[0011] S6, electroplating the surface of the guide magnet with nickel-copper-nickel;

[0012] S7, performing monopolar magnetization on the guide magnet, with the magnetization direction being horizontal;

[0013] S8, spraying glue on the bottom surface of the main magnet by using a spraying process to bond the iron sheet to the bottom surface of the main magnet;

[0014] S9. Glue is dispensed in the inner hole, and then the guide magnet is embedded in the inner hole. When the guide magnet is first embedded, the magnetic poles on both sides of the guide magnet are respectively the same as the magnetic poles on both sides of the top surface of the main magnet. There is a repulsive force between the guide magnet and the main magnet, and the guide magnet needs to be embedded in the inner hole with the help of a guide tool. The guide tool includes a first lifting cylinder, a guide plate, a guide push rod, and a positioning plate. The positioning plate is provided with a positioning groove for positioning the main magnet, and the guide plate is provided with a guide hole for placing the guide magnet. The guide plate is arranged above the positioning plate, and the guide magnet in the guide hole is aligned with the inner hole of the main magnet in the positioning groove up and down. The guide push rod is arranged above the guide hole, and the first lifting cylinder drives the connecting guide push rod;

[0015] After glue is dispensed into the inner hole, the main magnet is first installed into the positioning groove, and then the guide magnet is installed into the guide hole. Then the first lifting cylinder is started to drive the guide push rod to descend. The guide push rod pushes the guide magnet downward to the inner hole embedded in the main magnet. When the guide magnet is embedded to a depth of 40-50% of the inner hole, the repulsive force is converted into a downward adsorption force, and the guide magnet is adsorbed to the bottom of the inner hole.

[0016] Further, in step S9, a material trough and an adsorption magnet are further provided on the guide plate, and the material trough and the adsorption magnet are respectively arranged on both sides of the guide hole, and the material trough is a horizontal trough, one end of which is connected to the guide hole, and a plurality of mutually adsorbed guide magnets are mounted on the material trough, and the adsorption magnets are fixedly arranged on the guide plate and mutually adsorbed with the guide magnets in the guide hole, and when the guide push rod pushes the guide magnet in the guide hole downward to embed into the inner hole of the main magnet and then resets upward, the next guide magnet on the material trough is automatically adsorbed into the guide hole through the adsorption effect of the adsorption magnet.

[0017] Further, in step S9, a second lifting cylinder and a first side-pushing cylinder are respectively provided at the bottom and one side of the positioning plate. When the guide magnet is embedded in the inner hole, the second lifting cylinder drives the positioning plate to descend, and then the first side-pushing cylinder pushes the positioning plate sideways to stagger the positioning plate and the guide plate. Then, the Halbach magnetic assembly assembled on the positioning plate is removed, and the new main magnet is placed in the positioning groove. Then, the first side-pushing cylinder drives the positioning plate to reset, and the second lifting cylinder drives the positioning plate to move upward until it contacts the guide plate, and then the guide push rod moves downward to push the guide magnet in the guide hole to embed into the inner hole.

[0018] Further, in step S9, the positioning plate is provided with a mounting position, a jig plate is detachably mounted on the mounting position, the jig plate is provided with a plurality of positioning grooves, the guide plate is provided with a plurality of guide holes corresponding to the positioning grooves, and the number of the guide push rods corresponds to the guide holes.

[0019] Further, in step S1 and step S5, the raw material components of the NdFeB blank block material include the following elements in mass percentage:

[0020] PrNd: 18-20%, DyFe: 1-1.4%, Nd: 10-12%; Co: 1-1.5%; B: 0.93-0.97%, and the rest is Fe.

[0021] Further, in step S1 and step S5, the raw material components of the NdFeB blank block material include the following elements in mass percentage:

[0022] PrNd: 18.8%, DyFe: 1.2%, Nd: 10%; Co: 1.2%; B: 0.95%, Fe: 67.85%.

[0023] Further, in step S9, when the guide magnet is embedded to a depth of 40% of the inner hole, the repulsive force is transformed into a downward adsorption force.

[0024] Furthermore, in step S2, the inner hole is processed by laser cutting, and the processing tolerance of the inner hole is +0.04 / 0 mm.

[0025] Further, in step S2, when the laser cutting process is used to cut the inner hole of the main magnet, nitrogen is introduced into the cutting gap, the nitrogen pressure is 0.2-0.4MPa, the injection frequency is 2.6KHz, and the power is 270-350W.

[0026] Further, in step S5, the NdFeB blank block is cut into guide magnets by multi-wire cutting, and the machining tolerance of the guide magnets is 0 / -0.04 mm.

[0027] After adopting the above scheme, the beneficial effects of the present invention are:

[0028] 1. The present invention changes the existing main magnet from a plurality of unipolar independent magnets into an integral multipolar magnet, so that the repulsive force between the main magnets becomes a repulsive force inside a magnet, so that there is no repulsive force between the main magnets of different polarities, which is conducive to assembly and greatly reduces the difficulty of assembly. In addition, the number of magnets is reduced, avoiding the influence of cumulative tolerances, which is very beneficial to the control accuracy, especially for magnets of complex shapes. Moreover, the magnetic poles of different main magnets are in the same magnet, and the guide magnet is an embedded structure. Compared with the original fixing of different unipolar magnets by gluing, the strength is greatly increased, which can avoid the original industry bottleneck of debonding and save the amount of glue used.

[0029] 2. The guide magnet is an embedded structure. When it is first installed, it will be affected by the internal polarity of the main magnet and will have a downward repulsive force. This is beneficial to the contact and solidification between the guide magnet and the iron sheet, and helps to improve the assembly strength of the guide magnet. When the guide magnet is embedded to about half the depth of the inner hole, the repulsive force between the guide magnet and the main magnet will be transformed into an adsorption force, and the guide magnet will be adsorbed to the bottom of the inner hole, which is very beneficial to the curing of the glue. In addition, when dispensing glue in the inner hole, the glue is easy to control and will not overflow, thus eliminating the glue removal process.

[0030] 3. Since there is a repulsive force between the guide magnet and the main magnet when it is just embedded, manual assembly will be difficult. Therefore, the present invention uses a guide fixture for assembly. Through the guiding and limiting function of the guide hole, the thrust of the guide push rod can overcome the repulsive force on the guide magnet, and the guide magnet can be smoothly pushed into the inner hole. The assembly difficulty is low, and there is no need to use a large number of jigs to achieve positioning, extrusion, pressure holding and other actions, which reduces the investment cost of the jig, is not easy to scratch the surface of the magnet, and improves the yield rate.

[0031] 4. When the main magnet is subjected to surface treatment, due to the relatively small inner hole, ordinary electroplating nickel and zinc will produce a deep hole effect due to the skin effect principle of the current, resulting in poor electroplating effect of the inner hole. The present invention adopts a surface treatment method of first electroplating copper and then chemically plating nickel. The deep plating effect of electroplating copper is better and it is suitable for electroplating of the inner hole. Chemical nickel plating is a chemical deposition principle, and the deposition thickness of the surface is uniform, and the surface is smooth and flat, which is suitable for electroplating of the main magnet with an inner hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the structure of the existing Halbach magnetic assembly;

[0033] Figure 2 It is a schematic diagram of the upper and lower cooperation between the guide magnet and the inner hole of the present invention;

[0034] Figure 3 This is a schematic diagram of the guide magnet of the present invention when it is embedded into the inner hole to a depth of 40%;

[0035] Figure 4 A schematic diagram of the structure of a Halbach magnetic assembly of a single guide magnet according to an embodiment of the present invention;

[0036] Figure 5 This is a schematic diagram of the structure of a Halbach magnetic assembly with two guide magnets according to an embodiment of the present invention;

[0037] Figure 6 A schematic diagram of the structure of a Halbach magnetic assembly according to another embodiment of the present invention;

[0038] Figure 7 for Figure 4 AA section view;

[0039] Figure 8 The structure of the guide tooling of the present invention is schematically shown in FIG. Figure 1 ;

[0040] Fig. 9 The structure of the guide tooling of the present invention is schematically shown in FIG. Figure 2 ;

[0041] Fig.10 The structure of the guide tooling of the present invention is schematically shown in FIG. Figure 3 ;

[0042] Fig.11 It is a schematic diagram of the vertical cooperation between the guide push rod and the guide plate of the present invention;

[0043] Fig.12 for Fig.11 A local enlarged view of point A in FIG.

[0044] Fig.13 It is a structural schematic diagram of the guide plate of the present invention;

[0045] Fig.14 It is a structural schematic diagram of the positioning plate of the present invention;

[0046] Fig.15 It is a curve diagram showing the change of the repulsive force when the guide magnet of the present invention is embedded in the inner hole;

[0047] Fig.16 It is a process flow chart of the production method of the present invention.

[0048] Description of labels:

[0049] 1', main magnet; 2', guide magnet; 1, main magnet; 11, inner hole; 2, guide magnet; 3, iron sheet; 4, first lifting cylinder; 41, lifting plate; 5, guide plate; 51, guide hole; 52, material trough; 53, adsorption magnet; 54, extension plate; 55, mounting groove; 56, cover plate; 6, guide push rod; 7, positioning plate; 71, positioning groove; 72, mounting position; 73, fixture plate; 8, base; 81, second lifting cylinder; 9, mounting plate; 91, first side push cylinder; 92, second side push cylinder; 93, push plate; 10, frame. DETAILED DESCRIPTION

[0050] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0051] like Figure 1 As shown, in the existing Halbach magnetic circuit, the main magnet 1' and the guide magnet 2' are fixed on the iron sheet by gluing according to the requirements of the magnetic circuit. The main magnets are each independent unipolar magnets, and the polarity changes alternately NS every one or several guide magnets 2'. Such a structure is relatively optimal from the perspective of magnetic circuit principle. However, too many independent magnets not only make assembly difficult, but also the cumulative tolerance will be relatively large, affecting the assembly accuracy.

[0052] To this end, the present invention provides a method for manufacturing a magnetic circuit structure of a Halbach magnetic component. The prepared Halbach magnetic component structure is as follows: Figure 4 and Figure 5 As shown, it is composed of a main magnet 1 and one or more guide magnets 2. The Halbach magnetic circuit structure of a guide magnet 2 is as follows Figure 4 As shown, the Halbach magnetic circuit structure of the two guide magnets 2 is as follows Figure 5 As shown. Figure 7As shown, the main magnet 1 is a multipolar magnet, and both sides of the top and bottom surfaces thereof have two magnetic poles with opposite magnetic properties, and the two magnetic poles corresponding to the top and bottom surfaces have opposite polarities. An inner hole 11 penetrating from top to bottom is provided inside the main magnet 1, and a guide magnet 2 is embedded in the inner hole 11. The guide magnet 2 is a unipolar magnet, and the magnetic poles on both sides of the guide magnet 2 are respectively the same as the magnetic poles on both sides of the top surface of the main magnet 1. This structure is equivalent to changing the existing main magnet 1 from a plurality of unipolar independent magnets to an integral multipolar magnet, so that the repulsive force between the main magnets becomes a repulsive force inside a magnet, so that there is no repulsive force between the main magnets 1 of different polarities, which is conducive to assembly and greatly reduces the difficulty of assembly. In addition, the number of magnets is reduced, and the influence of cumulative tolerance is avoided, which is very beneficial to the control accuracy, especially for magnets of complex shapes. Moreover, the magnetic poles of different main magnets are in the same magnet, and the guide magnet 2 is an embedded structure. Compared with the original different unipolar magnets fixed by gluing, the strength is greatly increased, the original industry bottleneck of debonding can be avoided, and the amount of glue used can be saved.

[0053] The shape of the Halbach magnetic assembly of the present invention is not limited. In one embodiment, the shape of the Halbach magnetic assembly is as follows: Figure 4 and Figure 5 In another embodiment, the shape of the Halbach magnetic component is as follows Figure 6 The circular shape shown, at this time the main magnet 1 is a circular ring, which is easy to process. Of course, in addition to rectangle and circle, the Halbach magnetic assembly can also be a ring or other shapes.

[0054] like Fig.16 As shown, the manufacturing method specifically comprises the following steps:

[0055] S1. Using a multi-wire cutting method, a large NdFeB blank block is cut into small main magnets 1. At this time, the inner hole 11 of the main magnet 1 has not been processed.

[0056] The NdFeB blank block material can be selected as a magnet with the grade of NdFeB N52H, and its raw material components can contain the following elements in mass percentage: PrNd: 18-20%, DyFe: 1-1.4%, Nd: 10-12%; Co: 1-1.5%; B: 0.93-0.97%, and the rest is Fe.

[0057] Among them, PrNd alloy is cheaper than pure Nd, and PrNd has similar magnetic properties to NdFeB, but slightly higher intrinsic coercivity, which is helpful for forming the necessary main phase and improving the intrinsic coercivity; DyFeB compound has a higher magnetocrystalline anisotropy field and can provide a higher intrinsic coercivity. 1-1.4% DyFe can meet the performance of intrinsic coercivity Hcj ≥ 17kOe; Nd can provide the necessary rare earth phase for the formation of NdFeB magnets, and NdFeB has the highest remanence. Adding 10% pure neodymium can make up for the reduction in remanence caused by adding Dy and Co to meet the remanence Br ≥ 14.2kGs; Co can form Nd2(Fe,Co) 14 The B phase and the new intergranular phase Nd3Co can inhibit the disproportionation reaction and weaken the magnetic coupling between the main phase grains, thereby improving the temperature resistance; B is used to form the necessary main phase, and the remaining Fe is used to form the main phase and stabilize the crystal structure. Therefore, the main magnet 1 is made using the above raw material components. The remanence Br of the main magnet 1 is ≥14.2kGs, the intrinsic coercive force Hcj is ≥17kOe, the standard sample is resistant to temperature of 120°C, has good magnetic properties, and meets the preparation requirements of the main magnet 1.

[0058] Preferably, the raw material components of the NdFeB blank block specifically include the following elements in mass percentage: PrNd: 18.8%, DyFe: 1.2%, Nd: 10%; Co: 1.2%; B: 0.95%, Fe: 67.85%. The main magnet 1 made of this raw material component has the best magnetic properties.

[0059] S2. Process an inner hole 11 that runs through the main magnet 1 from top to bottom on the main magnet 1. The shape of the inner hole 11 is the same as that of the phase-conducting magnet. The inner hole 11 can be processed by laser cutting technology. The laser cutting technology has the advantages of high efficiency, precision, and flexible programming. It is suitable for processing the inner hole 11 of thin sheets. In order to facilitate assembly and minimize the assembly gap, the processing tolerance of the inner hole 11 is controlled to +0.04 / 0mm (that is, the upper tolerance is +0.04mm and the lower tolerance is 0).

[0060] It should be noted that the high temperature generated by the laser during the laser cutting process will instantly reach 1500°C, which is enough to melt the NdFeB magnet matrix in the light gap. However, due to the high temperature, the magnet will also be oxidized, which will cause fatal damage to the magnetic properties. Therefore, when laser cutting the main magnet 1 to process the inner hole 11, nitrogen with a purity of more than 99% should be introduced into the cutting gap. The nitrogen pressure is 0.2-0.4MPa, the injection frequency is 2.6KHz, and the power is 270-350W. The introduction of nitrogen protective atmosphere can achieve inert gas protection to prevent oxidation of the NdFeB magnet matrix, and the high-speed nitrogen can also quickly take away heat, thereby achieving rapid cooling.

[0061] S3. Surface treatment is performed on the main magnet 1. Since the inner hole 11 is relatively small, ordinary electroplating of nickel and zinc will produce a deep hole effect due to the skin effect principle of the current, resulting in poor electroplating effect of the inner hole 11. Therefore, the present invention adopts a surface treatment method of first electroplating copper and then chemically plating nickel. The deep plating effect of electroplating copper is better and it is suitable for the electroplating of the inner hole 11. Chemical nickel plating is a chemical deposition principle, and the deposition thickness of the surface is uniform, and the surface is smooth and flat, which is suitable for the electroplating of the main magnet 1 with the inner hole 11.

[0062] S4, performing multi-stage magnetization on the main magnet 1, the magnetic pole boundary lines of the top surface and the bottom surface of the main magnet 1 are both located at the center line position of the inner hole 11.

[0063] S5. Cut the NdFeB blank block into guide magnets 2. The raw material composition of the NdFeB blank block is the same as that of the main magnet 1. The outer contour size of the guide magnet 2 is the same as the inner contour size of the inner hole 11. The NdFeB blank block can also be cut into the guide magnet 2 by multi-wire cutting. The processing tolerance of the guide magnet 2 is controlled to 0 / -0.04mm (that is, the upper tolerance is 0 and the lower tolerance is -0.04mm). This setting will not interfere with the installation of the guide magnet 2 into the inner hole 11, and the gap after assembly is relatively small.

[0064] S6, electroplating the surface of the guide magnet 2 with nickel-copper-nickel.

[0065] S7, performing monopolar magnetization on the guide magnet 2, with the magnetization direction being horizontal.

[0066] S8. Bond the bottom surface of the main magnet 1 to the iron sheet 3. Since the main magnet 1 is an integral structure and has multi-pole magnetization inside, there is attraction with the iron sheet 3, so the bonding is not difficult. In order to control the residual glue at the middle inner hole 11, the glue spraying process is used to spray the bottom surface of the main magnet 1. The glue is anaerobic structural glue. Anaerobic structural glue has the characteristics of rapid solidification after isolation from oxygen and non-solidification in the atmospheric environment. It is very beneficial to the control of the glue dispensing process, and the strength can reach 20N / mm² shear strength after complete solidification.

[0067] S9. Glue is dispensed in the inner hole 11. Anaerobic structural glue is also used. Anaerobic structural glue is very suitable for such products with small gaps and small glue dispensing space. Then, the guide magnet 2 is embedded in the inner hole 11. When it is just embedded, the magnetic poles on both sides of the guide magnet 2 are respectively the same as the magnetic poles on both sides of the main magnet 1. There is a repulsive force between the guide magnet 2 and the main magnet 1, so the guide magnet 2 needs to be embedded in the inner hole 11 with the help of a guide tooling.

[0068] Key References Figure 8-14The guide fixture includes a first lifting cylinder 4, a guide plate 5, a guide push rod 6, and a positioning plate 7. The positioning plate 7 is provided with a positioning groove 71 for positioning the main magnet 1. The guide plate 5 is provided with a guide hole 51 for placing the guide magnet 2. The guide plate 5 is arranged above the positioning plate 7. The guide magnet 2 in the guide hole 51 is aligned with the inner hole 11 of the main magnet 1 in the positioning groove 71. The guide push rod 6 is arranged above the guide hole 51. The first lifting cylinder 4 drives the guide push rod 6 to drive the guide push rod 6 to rise and fall.

[0069] After the inner hole 11 is glued, the main magnet 1 is first installed into the positioning groove 71, and then the guide magnet 2 is installed into the guide hole 51. When installing, the magnetizing directions on both sides of the guide magnet 2 are placed in the same way as the magnetizing directions on both sides of the top surface of the main magnet 1, and the guide magnet 2 is aligned with the inner hole 11 up and down; then the first lifting cylinder 4 is started to drive the guide push rod 6 to descend, and the guide push rod 6 pushes the guide magnet 2 to move downward. Through the guiding and limiting effect of the guide hole 51, the thrust of the guide push rod 6 can overcome the repulsive force on the guide magnet 2, and the guide magnet 2 can be smoothly pushed into the inner hole 11. The assembly difficulty is low, and there is no need to use a large number of jigs to achieve positioning, extrusion, pressure holding and other actions, which reduces the investment cost of the jigs, is not easy to scratch the surface of the magnet, and improves the yield rate.

[0070] Moreover, when the guide magnet 2 is just beginning to be embedded, affected by the internal polarity of the main magnet 1, the guide magnet 2 will have a downward repulsive force, which is beneficial to the contact and curing of the guide magnet 2 and the iron sheet 3, and is helpful to improve the assembly strength of the guide magnet 2. When the guide magnet 2 is embedded to a depth of 40-50% of the inner hole, that is, about half the depth, the repulsive force between the guide magnet 2 and the main magnet 1 will be transformed into an adsorption force, and the guide magnet 2 will be adsorbed to the bottom of the inner hole 11, which is very beneficial to the curing of the glue. In addition, when dispensing glue in the inner hole 11, the glue is easy to control and will not overflow, thereby eliminating the glue removal process.

[0071] The present invention selects a magnet of NdFeB N52H to manufacture the main magnet 1 and the guide magnet 2. According to the magnetic properties of the magnet, the repulsive force F on the guide magnet 2 changes with the embedding depth L as shown in the following figure: Fig.15 As shown, the total depth of the inner hole 11 is 3 mm. When the guide magnet 2 is embedded to a depth of 1.2 mm, the repulsive force F exerted on the guide magnet 2 is 0. From this depth, the upward repulsive force exerted on the guide magnet 2 will turn into a downward attractive force, that is, when the guide magnet 2 is embedded to a depth of 40% of the inner hole, the repulsive force between the guide magnet 2 and the main magnet 1 will turn into an attractive force.

[0072] As a preferred embodiment, the shape of the guide hole 51 can be the same as that of the guide magnet 2. Guide holes 51 of different shapes can be set according to guide magnets 2 of different shapes. The shape of the positioning groove 71 is not limited and can be used to position the main magnet 1.

[0073] Key References Figure 11-13 , the guide plate 5 is also provided with a material trough 52 and an adsorption magnet 53, the material trough 52 and the adsorption magnet 53 are respectively arranged on both sides of the guide hole 51, the material trough 52 can be specifically a horizontal trough structure, one end of the material trough 52 is connected to the guide hole 51, the material trough 52 can be loaded with a plurality of mutually adsorbed guide magnets 2, the guide magnets 2 are arranged in a row, the adsorption magnet 53 is fixedly arranged on the guide plate 5 and mutually adsorbed with the guide magnet 2 in the guide hole 51, and the guide magnet 2 will be positioned in the guide hole 51 through the adsorption of the adsorption magnet 53 and the guide magnet on the material trough 52. Moreover, when the guide push rod 6 pushes the guide magnet 2 in the guide hole 51 downward to be embedded in the inner hole 11 of the main magnet 1 and then resets upward, the next guide magnet 2 on the material trough 52 will be automatically adsorbed into the guide hole 51 through the adsorption effect of the adsorption magnet 53, eliminating the process of frequently loading the guide magnet 2 into the guide hole 51, and only multiple guide magnets 2 need to be loaded into the guide hole 51.

[0074] like Fig.13 As shown, the material trough 52 is specifically arranged on the left side of the guide hole 51, and the right end of the material trough 52 is connected to the guide hole 51. If the length of the material trough 52 is not enough, an extension plate 54 can be added to the left side of the guide plate 5 to extend the length of the material trough 52 so that more guide magnets 2 can be loaded. An installation groove 55 for installing the adsorption magnet 53 is provided on the right side of the guide hole 51.

[0075] like Fig. 9 As shown, a cover plate 56 is provided above the material trough 52, and the cover plate 56 is placed on the left side of the guide hole 51. To achieve the limit of the guide hole 51 when the guide magnet 2 is embedded, the distance between the guide hole 51 and the inner hole 11 should be small, and the guide plate 5 should be in contact with or close to the positioning plate 7, which may cause the guide magnet 2 on the material trough 52 to be affected by the main magnet 1, which may cause the guide magnet 2 to tilt and affect its arrangement, thereby affecting the subsequent guide magnet 2 to be adsorbed to the guide hole 51. The cover plate 56 can prevent the guide magnet 2 from tilting and make its arrangement flat. In addition, the left end of the material trough 52 is not covered by the cover plate 56, and the guide magnet 2 can be loaded into the material trough 52 here.

[0076] Key References Figure 9-10The bottom and one side of the positioning plate 7 are respectively provided with a second lifting cylinder 81 and a first side pushing cylinder 91. When the guide magnet 2 is embedded in the inner hole 11, the second lifting cylinder 81 drives the positioning plate 7 to descend to move away from the guide plate 5. Then the first side pushing cylinder 91 pushes the positioning plate 7 sideways to stagger the positioning plate 7 and the guide plate 5. At this time, it is easy to remove the Halbach magnetic assembly assembled on the positioning plate 7, and it is also convenient to put the new main magnet 1 into the positioning groove 71. After the main magnet 1 is put into the positioning groove 71, the first side pushing cylinder 91 drives the positioning plate 7 to reset, so that the guide magnet 2 in the guide hole 51 is aligned with the inner hole 11 below. Then the second lifting cylinder 81 drives the positioning plate 7 to move upward until it contacts with the guide plate 5, and then the guide push rod 6 can move downward to push the guide magnet 2 in the guide hole 51 to embed into the inner hole 11.

[0077] Specifically, a mounting plate 9 is provided below the positioning plate 7, the first side-thrust cylinder 91 is horizontally arranged on the mounting plate 9, the positioning plate 7 is arranged on the first side-thrust cylinder 91 and is connected to the telescopic rod of the first side-thrust cylinder 91, the second lifting cylinder 81 is vertically arranged below the mounting plate 9, a base 8 is provided at the bottom of the second lifting cylinder 81, and frames 10 are provided on both sides of the base 8, and the guide plate 5 and the first lifting cylinder 4 are fixed on the frame 10.

[0078] Key References Fig.10 , Fig.11 and Fig.14 , the positioning plate 7 is provided with a mounting position 72, and a jig plate 73 is detachably mounted on the mounting position 72, and the jig plate 73 is provided with a plurality of positioning grooves 71, and the guide plate 5 is provided with a plurality of guide holes 51 corresponding to the positioning grooves 71, and the number of the guide push rods 6 corresponds to the guide holes 51, and the piston rod of the first lifting cylinder 4 is provided with a lifting plate 41, and a plurality of guide push rods 6 can be connected to the lifting plate 41. During assembly, the main magnets 1 with a plurality of glued iron sheets 3 are first loaded into the positioning grooves 71 of the jig plate 73, and then the jig plate 73 is loaded into the mounting position 72, so that the loading of the main magnet 1 can be completed, and a plurality of main magnets 1 can be installed at one time, and the embedded installation of a plurality of guide magnets 2 can be completed, and the first lifting cylinder 4 can complete the assembly of a plurality of Halbach magnetic components by descending once, which greatly improves the processing efficiency.

[0079] Specifically, one side of the mounting position 72 is provided with a side wall for the jig plate 73 to abut against, and the mounting plate 9 is also provided with a horizontally arranged second side push cylinder 92 on one side of the first side push cylinder 91, and the piston rod of the second side push cylinder 92 is connected to a push plate 93, and the push plate 93 pushes against one side of the jig plate 73 to position the jig plate 73 on the mounting position 72, thereby preventing the jig plate 73 from shifting, ensuring that the guide magnet 2 can be aligned with the inner hole 11 up and down, and improving the assembly accuracy.

[0080] The above description is only a preferred embodiment of the present invention and is not a limitation on the design of this case. Any equivalent changes made based on the design key of this case shall fall within the protection scope of this case.

Claims

1. A method for manufacturing a magnetic circuit structure of a Halbach magnetic component, characterized in that: The following steps are involved: S1. Use multi-wire cutting to cut the NdFeB blank into main magnets; S2. Processing an inner hole on the main magnet that passes through the main magnet from top to bottom; S3, electroplating copper and then chemically plating nickel on the surface of the main magnet; S4, multi-stage magnetization is performed on the main magnet, and both sides of the top and bottom surfaces of the main magnet have two magnetic poles with opposite magnetic properties, and the two magnetic poles corresponding to the top and bottom surfaces have opposite polarities, and the magnetic pole dividing lines of the top and bottom surfaces of the main magnet are both located at the center line of the inner hole; S5, cutting the NdFeB blank block into guide magnets, the size of the guide magnets being the same as the size of the inner hole; S6, electroplating the surface of the guide magnet with nickel-copper-nickel; S7, performing monopolar magnetization on the guide magnet, with the magnetization direction being horizontal; S8, spraying glue on the bottom surface of the main magnet by using a spraying process to bond the iron sheet to the bottom surface of the main magnet; S9. Glue is dispensed in the inner hole, and then the guide magnet is embedded in the inner hole. When the guide magnet is first embedded, the magnetic poles on both sides of the guide magnet are respectively the same as the magnetic poles on both sides of the top surface of the main magnet. There is a repulsive force between the guide magnet and the main magnet, and the guide magnet needs to be embedded in the inner hole with the help of a guide tool. The guide tool includes a first lifting cylinder, a guide plate, a guide push rod, and a positioning plate. The positioning plate is provided with a positioning groove for positioning the main magnet, and the guide plate is provided with a guide hole for placing the guide magnet. The guide plate is arranged above the positioning plate, and the guide magnet in the guide hole is aligned with the inner hole of the main magnet in the positioning groove up and down. The guide push rod is arranged above the guide hole, and the first lifting cylinder drives the connecting guide push rod; After glue is dispensed into the inner hole, the main magnet is first installed into the positioning groove, and then the guide magnet is installed into the guide hole. Then the first lifting cylinder is started to drive the guide push rod to descend. The guide push rod pushes the guide magnet downward to the inner hole embedded in the main magnet. When the guide magnet is embedded to a depth of 40-50% of the inner hole, the repulsive force is converted into a downward adsorption force, and the guide magnet is adsorbed to the bottom of the inner hole.

2. The method for manufacturing a magnetic circuit structure of a Halbach magnetic component according to claim 1, characterized in that: In step S9, a material trough and an adsorption magnet are further provided on the guide plate, and the material trough and the adsorption magnet are respectively arranged on both sides of the guide hole. The material trough is a horizontal trough, one end of which is connected to the guide hole, and the material trough is equipped with a plurality of guide magnets that adsorb each other. The adsorption magnets are fixedly arranged on the guide plate and adsorbed each other with the guide magnets in the guide hole. When the guide push rod pushes the guide magnet in the guide hole downward to embed into the inner hole of the main magnet and then resets upward, the next guide magnet on the material trough is automatically adsorbed into the guide hole through the adsorption effect of the adsorption magnet.

3. The method for manufacturing a magnetic circuit structure of a Halbach magnetic component according to claim 1, characterized in that: In step S9, a second lifting cylinder and a first side-pushing cylinder are respectively provided at the bottom and one side of the positioning plate. When the guide magnet is embedded in the inner hole, the second lifting cylinder drives the positioning plate to descend, and then the first side-pushing cylinder pushes the positioning plate sideways to stagger the positioning plate and the guide plate. Then the Halbach magnetic assembly assembled on the positioning plate is removed, and the new main magnet is placed in the positioning groove. Then the first side-pushing cylinder drives the positioning plate to reset, and the second lifting cylinder drives the positioning plate to move upward until it contacts the guide plate, and then the guide push rod moves downward to push the guide magnet in the guide hole to embed into the inner hole.

4. A method for manufacturing a magnetic circuit structure of a Halbach magnetic component according to any one of claims 1 to 3, characterized in that: In step S9, the positioning plate is provided with an installation position, a jig plate is detachably installed on the installation position, the jig plate is provided with a plurality of positioning grooves, the guide plate is provided with a plurality of guide holes corresponding to the positioning grooves, and the number of the guide push rods corresponds to the guide holes.

5. The method for manufacturing a magnetic circuit structure of a Halbach magnetic component according to claim 1, characterized in that: In step S1 and step S5, the raw material components of the NdFeB blank block material include the following elements in mass percentage: PrNd: 18-20%, DyFe: 1-1.4%, Nd: 10-12%; Co: 1-1.5%; B: 0.93-0.97%, and the rest is Fe.

6. The method for manufacturing a magnetic circuit structure of a Halbach magnetic component according to claim 5, characterized in that: In step S1 and step S5, the raw material components of the NdFeB blank block material include the following elements in mass percentage: PrNd: 18.8%, DyFe: 1.2%, Nd: 10%; Co: 1.2%; B: 0.95%, Fe: 67.85%.

7. A method for manufacturing a magnetic circuit structure of a Halbach magnetic component as claimed in claim 5 or 6, characterized in that: In step S9, when the guide magnet is embedded to a depth of 40% of the inner hole, the repulsive force is transformed into a downward adsorption force.

8. The method for manufacturing a magnetic circuit structure of a Halbach magnetic component according to claim 1, characterized in that: In step S2, the inner hole is processed by laser cutting, and the processing tolerance of the inner hole is +0.04 / 0mm.

9. The method for manufacturing a magnetic circuit structure of a Halbach magnetic component according to claim 1, characterized in that: In step S2, when the laser cutting process is used to cut the inner hole of the main magnet, nitrogen is introduced into the cutting gap, the nitrogen pressure is 0.2-0.4MPa, the injection frequency is 2.6KHz, and the power is 270-350W.

10. The method for manufacturing a magnetic circuit structure of a Halbach magnetic component according to claim 1, characterized in that: In step S5, the NdFeB blank block is cut into guide magnets by multi-wire cutting, and the machining tolerance of the guide magnets is 0 / -0.04 mm.

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