An assembly process of Halbach magnetic components

Abstract

The present invention relates to the field of magnet technology, and in particular to an assembly process of a Halbach magnetic assembly, comprising the following steps: S1, preparing a magnet body; S2, magnetizing the magnet body; S3, sorting the magnet body; S4, assembling; S5, detecting the direction of the magnetic field; S6, removing glue and curing. The present invention provides an assembly process of a Halbach magnetic assembly, wherein the magnets are closely arranged, the assembly work efficiency is improved, and the qualified rate of the product is improved.

Description

Technical Field

[0001] The invention relates to the technical field of magnets, and in particular to an assembly process of a Halbach magnetic component. Background Art

[0002] Halbach Array (Halbach Array, Halbach permanent magnet) is a magnet structure. In 1979, American scholar Klaus Halbach discovered this special permanent magnet structure during an electron acceleration experiment and gradually improved it, eventually forming the so-called "Halbach" magnet. It is an approximately ideal structure in engineering. It uses the arrangement of special magnet units to enhance the field strength in the unit direction. The goal is to use the least amount of magnets to produce the strongest magnetic field. This array is made entirely of rare earth permanent magnet materials. By arranging permanent magnets with different magnetization directions according to a certain pattern, it can gather magnetic lines of force on one side of the magnet and weaken them on the other side, thereby obtaining a relatively ideal unilateral magnetic field. This is of great significance in engineering. The Halbach Array is widely used in industrial fields such as nuclear magnetic resonance, magnetic levitation, and permanent magnet special motors due to its excellent magnetic field distribution characteristics.

[0003] At present, Halbach arrays include linear arrays and circular arrays. During the assembly process of the circular Halbach array, due to the mutual repulsive force between the magnets, the magnets are often not arranged tightly, resulting in large gaps, affecting the efficiency of the assembly work and causing a low product qualification rate. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides an assembly process of a Halbach magnetic component with high working efficiency and high product qualification rate.

[0005] The present invention adopts the following technical solution:

[0006] An assembly process of a Halbach magnetic assembly, characterized by comprising the following steps:

[0007] S1. Preparation of magnet body: Select NdFeB blanks that have passed the magnetic property test and meet the standard requirements, cut the NdFeB blanks into rectangular bar magnets according to different magnetization directions, use a grinding wheel and a guide rail to grind them, and cut them into rectangular bar magnets of a certain size again after processing, put the magnets into a chamfering machine, take them out after vibration grinding, and obtain the magnet body;

[0008] S2. Magnetizing the magnet: Place the magnet on a magnetizing fixture and put it into a magnetizing machine for magnetization;

[0009] S3, magnet body sorting: observe the direction of the magnetic lines of force of each magnet, and sort out 6 magnets with different magnetization directions, including the first magnet, the second magnet, the third magnet, the fourth magnet, the fifth magnet and the sixth magnet;

[0010] S4, assembly: prepare the tools for assembly, place the hardware on the assembly jig, and fix it on the assembly jig with a fixing ring; a cylinder with a plurality of grooves evenly arranged on the surface of one side of the hardware, insert the pins into the grooves, and form a keyway between two adjacent pins and the assembly jig and the hardware; apply glue to the first magnet and the sixth magnet respectively and install them into the keyway, then apply glue to the third magnet and the fourth magnet respectively and install them into the keyway, finally, move the pin upward to form a spatial position, apply glue to the second magnet and the fifth magnet and install them in the position, complete the assembly, and obtain the Halbach magnetic assembly;

[0011] S5. Detect the direction of the magnetic field: remove the cylinder on the hardware and check whether the magnetic field line pattern of the Halbach magnetic assembly meets the requirements. If not, find out the magnet with the wrong direction and rework it. If it meets the requirements, proceed to the next step.

[0012] S6. Glue removal and curing: After the residual glue on the surface of the Halbach magnetic component is initially removed, the component is placed in an oven for curing; the assembly jig is removed, and the residual glue on the surface of the Halbach magnetic component is secondary removed to obtain a prepared Halbach magnetic component.

[0013] A further improvement to the above technical solution is that, in S1, the grinding process is to process each magnet according to the process requirements of the outer R angle and the inner R angle;

[0014] A further improvement to the above technical solution is that in S1, after the grinding process, 2D projection inspection is used to confirm whether the magnet meets the process requirements. If it meets the requirements, subsequent steps are performed.

[0015] A further improvement to the above technical solution is that, in S1, corundum and chamfering stone are added into the chamfering machine.

[0016] A further improvement to the above technical solution is that, in S2, the magnet is arranged to be placed on a magnetizing fixture with its outer R facing upward.

[0017] A further improvement to the above technical solution is that, in S3, a magnetic display card is used to observe the direction of the magnetic lines of force of each magnet.

[0018] A further improvement to the above technical solution is that, in S3, the magnetizing direction of the second magnet is set axially outward; the magnetizing direction of the second magnet forms a first angle with the magnetizing direction of the first magnet; the magnetizing direction of the second magnet forms a second angle with the magnetizing direction of the third magnet; the magnetizing direction of the second magnet forms a third angle with the magnetizing direction of the fourth magnet; the magnetizing direction of the second magnet forms a fourth angle with the magnetizing direction of the fifth magnet; the magnetizing direction of the second magnet forms a fifth angle with the magnetizing direction of the sixth magnet; the first angle is set to 315°, the second angle is set to 45°, the third angle is set to 135°, the fourth angle is set to 180°, and the fifth angle is set to 225°.

[0019] A further improvement to the above technical solution is that, in S4, after the pin is inserted into the groove of the cylinder, it is fixed with a fixing belt.

[0020] A further improvement to the above technical solution is that, in S4, the first magnet, the second magnet, the third magnet, the fourth magnet, the fifth magnet and the sixth magnet are arranged in sequence along the circumferential direction and combined to form a magnet assembly, and two adjacent magnets are arranged closely to each other.

[0021] A further improvement to the above technical solution is that, in S6, the curing time is 1 hour to 3 hours.

[0022] The beneficial effects of the present invention are:

[0023] The present invention provides a cylinder with a plurality of grooves uniformly arranged on one side surface on the hardware, inserts the pins into the grooves and fixes them with fixing belts, forms keyways between two adjacent pins and the assembly jig and the hardware, installs the first magnet and the sixth magnet into the keyways after being glued, and then installs the third magnet and the fourth magnet into the keyways after being glued. Finally, the pin is moved upward to form a spatial position, and the second magnet and the fifth magnet are glued into the position to complete the assembly, thereby avoiding the problem of loose arrangement of magnets due to the mutually repulsive force between the magnets during the assembly process of the ring-shaped Halbach array, improving the efficiency of the assembly work and improving the qualified rate of the products. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A schematic diagram of the structure of a magnet assembly of the assembly process of the Halbach magnetic assembly of the present invention;

[0025] Figure 2 It is a schematic diagram of the various parts in the S4 assembly step in the assembly process of the Halbach magnetic component of the present invention.

[0026] Description of the reference numerals: hardware 10 , assembly jig 20 , fixing ring 30 , cylinder 40 , magnet assembly 50 , first magnet 51 , second magnet 52 , third magnet 53 , fourth magnet 54 , fifth magnet 55 , sixth magnet 56 , latch 60 , fixing belt 70 . DETAILED DESCRIPTION

[0027] In order to better understand the present invention, the present invention is further described below in conjunction with examples, but the embodiments of the present invention are not limited thereto.

[0028] An assembly process of a Halbach magnetic assembly, characterized by comprising the following steps:

[0029] S1. Preparation of magnet body: Select NdFeB blanks that have passed the magnetic property test and meet the standard requirements, cut the NdFeB blanks into rectangular bar magnets according to different magnetization directions, use grinding wheels and guide rails to grind them, and cut them into rectangular bar magnets of a certain size again after processing, put the magnets into a chamfering machine, take them out after vibration grinding, and electrolyze a layer of nickel on the surface of the magnets to obtain the magnet body;

[0030] S2. Magnetizing the magnet: Place the magnet on a magnetizing fixture and put it into a magnetizing machine for magnetization;

[0031] S3, magnet body sorting: observe the direction of the magnetic lines of force of each magnet, and sort out 6 magnets with different magnetization directions, including a first magnet 51, a second magnet 52, a third magnet 53, a fourth magnet 54, a fifth magnet 55 and a sixth magnet 56;

[0032] S4, assembly: prepare the tools for assembly, place the hardware 10 on the assembly jig 20, and fix it on the assembly jig 20 with a fixing ring 30; a cylindrical body 40 with a plurality of grooves evenly arranged on the surface of one side of the hardware 10, insert the pin 60 into the groove, and form a keyway between two adjacent pins 60 and the assembly jig 20 and the hardware 10; apply glue to the first magnet 51 and the sixth magnet 56 respectively and install them into the keyway, and then apply glue to the third magnet 53 and the fourth magnet 54 respectively and install them into the keyway, and finally, move the pin 60 upward to form a spatial position, apply glue to the second magnet 52 and the fifth magnet 55 and install them into the position, complete the assembly, and obtain the Halbach magnetic assembly;

[0033] S5, detecting the direction of the magnetic field: remove the cylinder 40 on the hardware 10, and check whether the magnetic field line pattern of the Halbach magnetic assembly meets the requirements. If not, find out the magnet with the wrong direction and rework it. If it meets the requirements, proceed to the next step;

[0034] S6, degumming and curing: After the residual glue on the surface of the Halbach magnetic component is initially degummed, the component is placed in an oven for curing; the assembly jig 20 is removed, and the residual glue on the surface of the Halbach magnetic component is degummed for a second time to obtain a prepared Halbach magnetic component.

[0035] A further improvement to the above technical solution is that, in S1, the grinding process is to process each magnet according to the process requirements of the outer R angle and the inner R angle;

[0036] A further improvement to the above technical solution is that in S1, after the grinding process, 2D projection inspection is used to confirm whether the magnet meets the process requirements. If it meets the requirements, subsequent steps are performed.

[0037] A further improvement to the above technical solution is that, in S1, corundum and chamfering stone are added into the chamfering machine.

[0038] A further improvement to the above technical solution is that, in S2, the magnet is arranged to be placed on a magnetizing fixture with its outer R facing upward.

[0039] A further improvement to the above technical solution is that, in S3, a magnetic display card is used to observe the direction of the magnetic lines of force of each magnet.

[0040] A further improvement to the above technical solution is that, in S3, the magnetizing direction of the second magnet 52 is set axially outward; the magnetizing direction of the second magnet 52 forms a first angle with the magnetizing direction of the first magnet 51; the magnetizing direction of the second magnet 52 forms a second angle with the magnetizing direction of the third magnet 53; the magnetizing direction of the second magnet 52 forms a third angle with the magnetizing direction of the fourth magnet 54; the magnetizing direction of the second magnet 52 forms a fourth angle with the magnetizing direction of the fifth magnet 55; the magnetizing direction of the second magnet 52 forms a fifth angle with the magnetizing direction of the sixth magnet 56; the first angle is set to 315°, the second angle is set to 45°, the third angle is set to 135°, the fourth angle is set to 180°, and the fifth angle is set to 225°.

[0041] A further improvement to the above technical solution is that in S4 , after the pin 60 is inserted into the groove of the cylindrical body 40 , it is fixed with a fixing belt 70 .

[0042] A further improvement to the above technical solution is that, in S4, the first magnet 51, the second magnet 52, the third magnet 53, the fourth magnet 54, the fifth magnet 55 and the sixth magnet 56 are arranged in sequence along the circumferential direction and combined to form a magnet assembly 50, and two adjacent magnets are arranged closely to each other.

[0043] A further improvement to the above technical solution is that, in S6, the curing time is 1 hour to 3 hours.

[0044] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. An assembly process of a Halbach magnetic assembly, characterized in that: The steps include: S1. Preparation of magnet body: Select NdFeB blanks that have passed the magnetic property test and meet the standard requirements, cut the NdFeB blanks into rectangular bar magnets according to different magnetization directions, use a grinding wheel and a guide rail to grind them, and cut them into rectangular bar magnets of a certain size again after processing, put the magnets into a chamfering machine, take them out after vibration grinding, and obtain the magnet body; S2. Magnetizing the magnet: Place the magnet on a magnetizing fixture and put it into a magnetizing machine for magnetization; S3, magnet body sorting: observe the direction of the magnetic lines of force of each magnet, and sort out 6 magnets with different magnetization directions, including the first magnet, the second magnet, the third magnet, the fourth magnet, the fifth magnet and the sixth magnet; S4, assembly: prepare the tools for assembly, place the hardware on the assembly jig, and fix it on the assembly jig with a fixing ring; a cylinder with a plurality of grooves evenly arranged on the surface of one side of the hardware, insert the pins into the grooves, and form a keyway between two adjacent pins and the assembly jig and the hardware; apply glue to the first magnet and the sixth magnet respectively and install them into the keyway, then apply glue to the third magnet and the fourth magnet respectively and install them into the keyway, finally, move the pin upward to form a spatial position, apply glue to the second magnet and the fifth magnet and install them in the position, complete the assembly, and obtain the Halbach magnetic assembly; S5. Detect the direction of the magnetic field: remove the cylinder on the hardware and check whether the magnetic field line pattern of the Halbach magnetic assembly meets the requirements. If not, find out the magnet with the wrong direction and rework it. If it meets the requirements, proceed to the next step. S6, glue removal and curing: After the residual glue on the surface of the Halbach magnetic component is initially removed, it is placed in an oven for curing; The assembly jig is removed, and the residual glue on the surface of the Halbach magnetic component is removed for a second time to obtain the prepared Halbach magnetic component.

2. The assembly process of the Halbach magnetic assembly according to claim 1, characterized in that: In the step S1, the grinding process is to process each magnet according to the process requirements of the outer R angle and the inner R angle.

3. The assembly process of the Halbach magnetic assembly according to claim 1, characterized in that: In S1, after the grinding process, 2D projection inspection is performed to confirm whether the magnet meets the process requirements. If it meets the requirements, the subsequent steps are carried out.

4. The assembly process of the Halbach magnetic assembly according to claim 1, characterized in that: In S1, corundum and chamfering stone are added into the chamfering machine.

5. The assembly process of the Halbach magnetic assembly according to claim 1, characterized in that: In S2, the magnet is arranged with its outer R facing upward and placed on a magnetizing fixture.

6. The assembly process of the Halbach magnetic assembly according to claim 1, characterized in that: In the above S3, the direction of the magnetic field lines of each magnet is observed using a magnetic display card.

7. The assembly process of the Halbach magnetic assembly according to claim 1, characterized in that: In S3, the magnetizing direction of the second magnet is set axially outward; the magnetizing direction of the second magnet forms a first angle with the magnetizing direction of the first magnet; the magnetizing direction of the second magnet forms a second angle with the magnetizing direction of the third magnet; the magnetizing direction of the second magnet forms a third angle with the magnetizing direction of the fourth magnet; the magnetizing direction of the second magnet forms a fourth angle with the magnetizing direction of the fifth magnet; the magnetizing direction of the second magnet forms a fifth angle with the magnetizing direction of the sixth magnet; the first angle is set to 315°, the second angle is set to 45°, the third angle is set to 135°, the fourth angle is set to 180°, and the fifth angle is set to 225°.

8. The assembly process of the Halbach magnetic assembly according to claim 1, characterized in that: In S4, after the pin is inserted into the groove of the cylinder, it is fixed with a fixing belt.

9. The assembly process of the Halbach magnetic assembly according to claim 1, characterized in that: In the S4, the first magnet, the second magnet, the third magnet, the fourth magnet, the fifth magnet and the sixth magnet are arranged in sequence along the circumferential direction and combined to form a magnet assembly, and two adjacent magnets are arranged closely to each other.

10. The assembly process of the Halbach magnetic assembly according to claim 1, characterized in that: In the S6, the curing time is 1 hour to 3 hours.

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