Rear magnetizing device of mobile phone shell and aramid fiber strong magnetic mobile phone shell

Abstract

The utility model discloses a mobile phone shell rear magnetizing device and an aramid fiber strong magnetic mobile phone shell, the device comprises a magnetizing jig, the magnetizing jig comprises a magnetizing upper die and a magnetizing lower die, the magnetizing lower die is provided with a profiling cavity, the shape of the profiling cavity is the shape of a mobile phone shell to be magnetized, an unmagnetized mobile phone shell is positioned and placed in the profiling cavity, and the magnetizing upper die and the magnetizing lower die are arranged in the profiling cavity. A magnetic steel ring is arranged in an interlayer of the mobile phone shell, the magnetizing upper die comprises an upper magnetizing magnetic ring, the magnetizing lower die comprises a lower magnetizing magnetic ring, the central axis of the upper magnetizing magnetic ring is coaxial with the central axis of the lower magnetizing magnetic ring, and during magnetizing, the central axis of the upper magnetizing magnetic ring and the central axis of the lower magnetizing magnetic ring are coaxial with the central axis of the magnetic steel ring. According to the mobile phone shell post-magnetizing device and the mobile phone shell, the magnetic steel ring is embedded into the aramid fiber shell, the mobile phone shell is formed at high temperature, and then the magnetic steel ring is strongly magnetized, so that the magnetism of the magnetic steel ring can be effectively enhanced, the magnetic attraction force is strong, and the magnetism is not attenuated after long-term use.

Description

Technical Field

[0001] This utility model relates to the field of mobile phone accessory processing technology, specifically to a mobile phone case magnetization device and an aramid fiber strong magnetic mobile phone case. Background Technology

[0002] Most existing mobile phone cases are made of materials such as plastic and silicone, which have drawbacks such as being not durable, not drop-resistant, unattractive, having a poor feel, and being heavy.

[0003] Aramid fiber phone cases are becoming increasingly popular among users. Their unique texture allows for more stylish designs, a thinner and lighter structure, and a better feel.

[0004] Existing aramid fiber phone cases with magnetic functionality incorporate permanent magnets, allowing them to be clipped onto or attached to car mounts, or to attach extended functionality modules to the back of the phone, such as Apple's MagSafe card holder. The magnetic card holder attaches directly to the back of the phone case where the magnets are located.

[0005] However, existing aramid fiber phone cases with magnetic attraction have the following drawbacks:

[0006] Aramid fiber phone cases require high temperature and high pressure to be formed. When a permanent magnet is embedded in the phone case, the thermal motion of the atoms in the permanent magnet becomes more intense due to the high temperature and high pressure, which disrupts the orderly arrangement of electron spins and weakens the magnetism. Therefore, aramid fiber phone cases have low magnetism, weak magnetic attraction, poor adsorption effect, and poor user experience. Summary of the Invention

[0007] Based on this, in order to solve the above-mentioned problems in traditional technology, this utility model proposes a method of first embedding a magnetic steel ring inside an aramid fiber housing, then molding it at high temperature, and then strongly magnetizing the magnetic steel ring to avoid the influence of high temperature and high pressure environment on the magnetism, effectively enhancing the magnetism of the magnetic steel ring, resulting in a strong magnetic attraction force and no magnetic attenuation after long-term use, as well as an aramid fiber strong magnetic mobile phone case.

[0008] In a first aspect, this utility model relates to a magnetizing device for a mobile phone case, comprising a magnetizing fixture, which includes an upper magnetizing mold and a lower magnetizing mold. The lower magnetizing mold has a contoured cavity, the shape of which is the shape of the mobile phone case to be magnetized. An unmagnetized mobile phone case is positioned in the contoured cavity. A magnetic steel ring is provided in the interlayer of the mobile phone case. The upper magnetizing mold includes an upper magnetizing ring, and the lower magnetizing mold includes a lower magnetizing ring. The central axes of the upper magnetizing ring and the lower magnetizing ring are coaxial. During magnetization, the central axes of the upper magnetizing ring, the lower magnetizing ring, and the magnetic steel ring are all coaxial.

[0009] The upper magnetizing mold has multiple interconnected upper cooling channels, and the lower magnetizing mold has multiple interconnected lower cooling channels. The upper magnetizing ring is installed in the upper fixed seat, which is detachably installed in the upper magnetizing mold. The lower magnetizing ring is installed in the lower fixed seat, which is detachably installed in the lower magnetizing mold.

[0010] Regarding the overall device, the magnetizing device behind the phone case also includes a cooling machine and a magnetizer. The cooling machine includes a first delivery pipe and a second delivery pipe. The first delivery pipe is connected to the input ports of the upper cooling channel and the lower cooling channel, and the second delivery pipe is connected to the output ports of the upper cooling channel and the lower cooling channel. The magnetizer includes a positive terminal and a negative terminal. The positive terminal is connected to the first electrode terminals of the upper magnetizing coil and the lower magnetizing coil, and the negative terminal is connected to the second electrode terminals of the upper magnetizing coil and the lower magnetizing coil.

[0011] In the manual operation embodiment, the lower magnetizing mold is fixed on the base plate, and the base plate is equipped with a first guide post and a second guide post on both sides of the lower magnetizing mold. A pressure plate is slidably installed between the first guide post and the second guide post, and the pressure plate is connected to the upper magnetizing mold. The top of the first guide post and the second guide post are connected by a fixed beam, and a motor that drives the pressure plate is installed on the fixed beam. The motor is connected to the pressure plate through a telescopic rod.

[0012] In the automatic feeding embodiment, the magnetizing lower mold is fixed on the base plate. The base plate is provided with a first guide rail and a second guide rail in front of and behind the magnetizing lower mold. A first feeding component is slidably installed on the first guide rail, and a second feeding component is slidably installed on the second guide rail. The first feeding component and the second feeding component are connected by a connecting rod, and the second feeding component is connected to a stroke cylinder.

[0013] Similarly, in the automatic feeding embodiment, the base plate is equipped with a first guide post and a second guide post on both sides of the magnetizing lower mold. A pressure plate is slidably installed between the first guide post and the second guide post. The pressure plate is connected to the magnetizing upper mold. The top of the first guide post and the second guide post are connected by a fixed beam. A motor that drives the pressure plate is installed on the fixed beam. The motor is connected to the pressure plate through a telescopic rod.

[0014] Secondly, this utility model relates to an aramid fiber strong magnetic mobile phone case, including an aramid fiber inner shell layer, an aramid fiber outer shell layer, a sandwich layer, and a post-magnetized magnetic steel ring. The sandwich layer is cut with an installation ring groove, and the non-magnetic magnetic steel ring is placed in the installation ring groove. The mobile phone case is first formed under high temperature and high pressure and then placed in a post-magnetizing device to strongly magnetize the magnetic steel ring in the sandwich layer. The post-magnetizing device includes a magnetizing upper mold and a magnetizing lower mold. The magnetizing upper mold includes an upper magnetizing magnetic ring, and the magnetizing lower mold includes a lower magnetizing magnetic ring. The central axes of the upper magnetizing magnetic ring and the lower magnetizing magnetic ring are coaxial. During magnetization, the central axes of the upper magnetizing magnetic ring, the lower magnetizing magnetic ring, and the magnetic steel ring are all coaxial.

[0015] This utility model discloses a magnetic charging device for mobile phone cases. A magnetic ring is first embedded inside the aramid fiber mobile phone case and formed at high temperature before being strongly magnetized. This avoids the influence of high temperature and high pressure on the magnetism, effectively enhancing the magnetism of the magnetic ring. The strong magnetic attraction and long-term magnetic attenuation result in a mobile phone case with strong magnetic function. For example, when using a mobile phone equipped with this aramid fiber strong magnetic mobile phone case, the phone adheres stably and firmly to a wireless charger or car mount, ensuring the phone will not slip during navigation and improving driving safety. Furthermore, the mobile phone case and magnetic card holder fit perfectly, greatly improving the card holder's stability and reducing the risk of loss.

[0016] This utility model discloses a magnetic charging device for mobile phone cases. It features a contoured cavity, allowing for easy magnetization of an unmagnetized phone case upon insertion. The device offers convenient, quick, and precise magnetization. For manual magnetization, the upper magnetizing mold is raised, the unmagnetized phone case is inserted, and the upper and lower magnetizing rings are energized via a magnetizer for a set time. The upper magnetizing mold is then lifted. The magnetic charging device is simple to operate manually.

[0017] The present invention relates to a mobile phone case remagnetization device, which integrates the remagnetization device into an automated production line by combining it with an automatic feeding mechanism, thereby achieving semi-automatic remagnetization of mobile phone cases.

[0018] This utility model relates to an aramid fiber strong magnetic phone case. The magnetic steel ring is first embedded inside the aramid fiber phone case and then formed at high temperature before being strongly magnetized. This avoids the influence of high temperature and high pressure environment on the magnetism and effectively enhances the magnetism of the magnetic steel ring. In addition, during magnetization, the upper and lower magnetic rings are coaxial with the central axis of the magnetic steel ring to ensure the strong magnetization effect of the magnetic steel ring. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] in:

[0021] Figure 1 This is a cross-sectional view of the aramid fiber strong magnetic mobile phone case in this embodiment;

[0022] Figure 2 This is a schematic diagram of the assembly structure of the aramid fiber strong magnetic mobile phone case in this embodiment;

[0023] Figure 3 This is a simplified structural diagram of the first embodiment of the mobile phone case back magnetization device in this embodiment;

[0024] Figure 4 This is a cross-sectional view of the first embodiment of the mobile phone case back magnetization device in this embodiment;

[0025] Figure 5 This is a cross-sectional view of the second embodiment of the magnetic charging device for the phone case in this embodiment;

[0026] Figure 6 This is a cross-sectional view of the magnetizing fixture of the second embodiment of the mobile phone case magnetizing device in this embodiment;

[0027] Figure 7 for Figure 6 Perspective view of the internal structure of the magnetizing fixture in the second embodiment;

[0028] Figure 8 for Figure 6 A diagram of the magnetized lower mold and the lifting and pressing mechanism in the second embodiment;

[0029] Figure 9 This is a schematic diagram showing the positional relationship between the upper and lower magnetized magnetic rings and the magnetic steel ring in this embodiment;

[0030] Figure 10 This is a structural diagram of the phone magnetization positioning device for the phone case back magnetization device in this embodiment;

[0031] Figure 11 This is a structural diagram of the third embodiment of the mobile phone case magnetization device in this embodiment;

[0032] Figure 12 This is an overall structural diagram of the magnetic charging device on the back of the phone case in this embodiment; Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0034] Example 1

[0035] like Figure 1 as well as Figure 2 As shown, the aramid fiber strong magnetic mobile phone case 9 of this embodiment includes an aramid fiber inner shell layer 92, an aramid fiber outer shell layer 93, a sandwich layer 98, and a magnetized steel ring 95.

[0036] In this embodiment, the aramid fiber inner shell layer 92 and the aramid fiber outer shell layer 93 are made of aramid fiber woven material and pre-impregnated with epoxy resin, with a stylish texture, thin and light structure and good feel.

[0037] The interlayer 98 is cut with mounting ring grooves 981. Before high-temperature hot pressing, a non-magnetic magnetic steel ring 95 is placed in the mounting ring groove 981. In this embodiment, the mobile phone case 9 is first formed by high temperature and high pressure, and then the already made mobile phone case 9 is placed into the magnetizing device to strongly magnetize the magnetic steel ring 95 in the interlayer 98.

[0038] In this embodiment, the aramid fiber strong magnetic phone case first embeds the magnetic steel ring 95 inside the aramid fiber phone case 9. After the phone case is formed at high temperature, the magnetic steel ring 95 is then strongly magnetized. This avoids the influence of high temperature and high pressure environment on the magnetism, effectively enhances the magnetism of the magnetic steel ring 95, and results in strong magnetic attraction with no magnetism decay over long-term use. This achieves the production of an aramid fiber phone case 9 with strong magnetic function.

[0039] Please refer to this as well. Figure 4 or Figure 6 To ensure a strong magnetization effect on the magnet ring 95, the post-magnetization device includes an upper magnetization mold 5 and a lower magnetization mold 3. The upper magnetization mold 5 includes an upper magnetization ring 6. The lower magnetization mold 3 includes a lower magnetization ring 4. The central axis X1 of the upper magnetization ring 6 and the central axis X2 of the lower magnetization ring 4 are coaxial. The central axis of the magnet ring 96 is X3. During magnetization, the upper magnetization ring 6, the lower magnetization ring 4, and the central axis (X1-X3) of the magnet ring 96 are all coaxial.

[0040] Example 2

[0041] like Figures 3 to 12 The diagram shown is a structural diagram of different embodiments of the magnetic charging device for the back of the phone case in this embodiment.

[0042] Please refer to this as well. Figure 12 In different embodiments of the magnetizing device on the back of the mobile phone case, a cooling machine 200, a magnetizer 300, and a magnetizing worktable 100 are all included. A magnetizing fixture is installed on the magnetizing worktable 100. The magnetizing fixture includes an upper magnetizing mold 5 and a lower magnetizing mold 3. The magnetizer 300 controls the magnetizing power through a control panel 310.

[0043] In different embodiments of the magnetizing device behind the phone case, the difference lies in the magnetizing fixture, while the aramid fiber strong magnetic phone case structure, the cooling machine 200, and the magnetizing machine 300 are the same.

[0044] Please refer to Figure 3 as well as Figure 4 The diagram shows a structural diagram and a cross-sectional view of the first embodiment of the magnetizing device for a mobile phone case. This first embodiment is the simplest form of the magnetizing device.

[0045] In the first embodiment, the magnetizing fixture includes an upper magnetizing mold 5 and a lower magnetizing mold 3. The upper magnetizing mold 5 has multiple interconnected upper cooling channels, for example... Figure 3The upper cooling channel inlet 571 is visible in the middle. Multiple interconnected lower cooling channels are formed in this magnetized lower mold 3, for example, Figure 3 The lower cooling channel inlet 372 is visible in the middle.

[0046] The phone case 9 has a magnetic ring 95 in the interlayer 98. The magnetizing upper mold 5 includes an upper fixing base 51, in which an upper magnetizing ring 6 is disposed. The magnetizing lower mold 3 includes a lower fixing base 31, in which a lower magnetizing ring 4 is disposed. Referring to the figure of the upper mold 9, the central axis X1 of the magnetic ring 6 and the central axis X2 of the lower magnetizing ring 4 are coaxial. During magnetization, the central axes (X1-X3) of the upper magnetizing ring 6, the lower magnetizing ring 4, and the magnetic ring 95 are all coaxial.

[0047] Please refer to Figures 5 to 10 The diagram shown is a structural diagram of the second embodiment of the mobile phone case magnetization device. The mobile phone case magnetization device in Embodiment 2 can be manually operated for magnetization.

[0048] In the second embodiment, the aramid fiber strong magnetic phone case 9, the cooling machine 200, and the magnetizer 300 have the same structure, but differ in the magnetization fixture. This magnetization fixture includes an upper magnetization mold 5 and a lower magnetization mold 3. The lower magnetization mold 3 has a contour cavity 35 and an operating cavity 38, as shown below. Figure 8 As shown. The shape of the contoured cavity 35 is the same as that of the phone case 9 to be magnetized, and the unmagnetized phone case 9 is positioned in the contoured cavity 35. The operating cavity 38 facilitates the removal of the magnetized phone case 9.

[0049] like Figure 6 as well as Figure 8 As shown, in this embodiment, the upper magnetizing ring 6 is installed in the upper fixed base 52, which is detachably installed in the upper magnetizing mold 5. The lower magnetizing ring 4 is installed in the magnetizing position 33 of the lower fixed base 32, which is detachably installed in the lower magnetizing mold 3. This allows for the replacement of magnetizing rings of different specifications according to actual application needs.

[0050] Similarly, please refer to Figure 9 The central axis X1 of the upper magnetizing coil 6 is coaxial with the central axis X2 of the lower magnetizing coil 4. During magnetization, the central axes (X1-X3) of the upper magnetizing coil 6, the lower magnetizing coil 4, and the magnetic ring 95 are all coaxial. The upper magnetizing coil 6 includes a first electrode terminal 61 (positive terminal) and a second electrode terminal 62 (negative terminal). The lower magnetizing coil 4 includes a first electrode terminal 41 (positive terminal) and a second electrode terminal 42 (negative terminal).

[0051] The magnetizer 300 includes a positive terminal 321 and a negative terminal 322. The positive terminal 321 is connected to the first electrode terminals (61, 41) of the upper magnetizing coil 6 and the lower magnetizing coil 4, and the negative terminal 322 is connected to the second electrode terminals (62, 42) of the upper magnetizing coil 6 and the lower magnetizing coil 4.

[0052] Please refer to Figure 5 In the manual operation embodiment, the lower magnetizing mold 3 is fixed to the base plate 1. A first guide post 12 and a second guide post 13 are mounted on both sides of the lower magnetizing mold 3 on the base plate 1. A pressure plate 19 is slidably mounted between the first guide post 12 and the second guide post 13, and the pressure plate 19 is connected to the upper magnetizing mold 5. The tops of the first guide post 12 and the second guide post 13 are connected by a fixed beam 16. A motor 17 that drives the pressure plate 19 is mounted on the fixed beam 16. The motor 17 is connected to the pressure plate 19 via a telescopic rod 18.

[0053] Please refer to Figure 10 When manually magnetizing, the starter motor 17 raises the upper magnetizing mold 5 via the telescopic rod 18, and the unmagnetized mobile phone case 9 is placed in the contour cavity 35 of the lower magnetizing mold 3. The shape of the contour cavity is the same as that of the mobile phone case, which plays a positioning role and aligns the magnetic ring 95 inside the mobile phone case 9 with the lower magnetizing magnetic ring 4 in the magnetizing position 33. Placing the mobile phone case 9 in the mold achieves positioning and alignment.

[0054] The upper magnetizing mold 5 and the lower magnetizing mold 3 are closed by the telescopic rod 18 and the pressure plate 19. The magnetizer 300 controls the power output to conduct the upper magnetizing ring 6 and the lower magnetizing ring 4, and magnetization is completed within the set magnetization time. The motor 17 is started to lift the upper magnetizing mold 5 through the telescopic rod 18 to complete the post-magnetization of the magnetic ring 95 of the phone case 9. The worker can then remove the phone case 9 from the operating cavity 38 using the notch 96. The magnetizing device is simple and convenient to operate manually.

[0055] Please refer to Figure 7 The magnetized upper mold 5 has multiple interconnected upper cooling channels, for example, Figure 7 The upper cooling channel inlets 571 and 572 and the upper cooling channel outlet 573 are visible. This magnetized lower mold 3 has multiple interconnected lower cooling channels, for example... Figure 7 The lower cooling channel inlets 371 and 372 and the lower cooling channel outlet 373 are visible. The cooler 200 includes a first conveying pipe 210 and a second conveying pipe 220. The first conveying pipe 210 connects the inlets (571 and 572) of the upper cooling channel and the inlets (371 and 372) of the lower cooling channel, and the second conveying pipe 220 connects the outlet 573 of the upper cooling channel and the outlet 373 of the lower cooling channel.

[0056] Please refer to Figure 11The diagram shown is a structural diagram related to the automatic feeding of the third embodiment of the mobile phone case back magnetization device in this embodiment.

[0057] In the automatic feeding embodiment, the magnetized lower mold 3 is fixed on the base plate 1, and the base plate 1 is provided with a first guide rail 23 and a second guide rail 21 before and after the magnetized lower mold 3. A first feeding component 24 is slidably installed on the first guide rail 23. A second feeding component 22 is slidably installed on the second guide rail 21, and the first feeding component 24 is located below the feeding plate 25.

[0058] The lower magnetizing mold 3 is fixed on the base plate 1. A first guide post 12 and a second guide post 13 are mounted on both sides of the lower magnetizing mold 3 on the base plate 1. A sliding pressure plate 19 connects the first guide post 12 and the second guide post 13, and the pressure plate 19 is connected to the upper magnetizing mold 5. The tops of the first guide post 12 and the second guide post 13 are connected by a fixed beam 16. A motor 17 that drives the pressure plate 19 is mounted on the fixed beam 16. The motor 17 is connected to the pressure plate 19 via a telescopic rod 18.

[0059] In this embodiment, the post-magnetization device can be integrated into an automated production line by combining an automatic feeding mechanism, thus semi-automatically realizing the post-magnetization operation of the mobile phone case.

[0060] The above-disclosed embodiments are merely preferred embodiments of the present utility model and should not be construed as limiting the scope of the present utility model. Therefore, any equivalent variations made in accordance with the claims of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A magnetic charging device for a mobile phone case, characterized in that, The device includes a magnetizing fixture, comprising an upper magnetizing mold and a lower magnetizing mold. The lower magnetizing mold has a contoured cavity shaped like the phone case to be magnetized. An unmagnetized phone case is positioned within the contoured cavity. A magnetic ring is provided in the interlayer of the phone case. The upper magnetizing mold includes an upper magnetizing ring, and the lower magnetizing mold includes a lower magnetizing ring. The central axes of the upper and lower magnetizing rings are coaxial. During magnetization, the central axes of the upper and lower magnetizing rings and the magnetic ring are all coaxial.

2. The mobile phone case back magnetization device according to claim 1, characterized in that, The upper magnetizing mold has multiple interconnected upper cooling channels, and the lower magnetizing mold has multiple interconnected lower cooling channels; the upper magnetizing ring is installed in the upper fixed seat, and the upper fixed seat is detachably installed in the upper magnetizing mold; the lower magnetizing ring is installed in the lower fixed seat, and the lower fixed seat is detachably installed in the lower magnetizing mold.

3. The mobile phone case back magnetization device according to claim 2, characterized in that, It also includes a cooling machine and a magnetizer. The cooling machine includes a first conveying pipe and a second conveying pipe. The first conveying pipe is connected to the input port of the upper cooling channel and the lower cooling channel, and the second conveying pipe is connected to the output port of the upper cooling channel and the lower cooling channel.

4. The mobile phone case back magnetization device according to claim 3, characterized in that, The magnetizer includes a positive terminal and a negative terminal. The positive terminal is connected to the first electrode terminal of the upper magnetizing coil and the lower magnetizing coil, and the negative terminal is connected to the second electrode terminal of the upper magnetizing coil and the lower magnetizing coil.

5. The mobile phone case back magnetization device according to any one of claims 1-4, characterized in that, The lower magnetizing mold is fixed on the base plate. The base plate is equipped with a first guide post and a second guide post on both sides of the lower magnetizing mold. A pressure plate is slidably installed between the first guide post and the second guide post. The pressure plate is connected to the upper magnetizing mold. The tops of the first guide post and the second guide post are connected by a fixed beam. A motor that drives the pressure plate is installed on the fixed beam. The motor is connected to the pressure plate through a telescopic rod.

6. The mobile phone case back magnetization device according to any one of claims 1-4, characterized in that, The magnetizing lower mold is fixed on the base plate. The base plate is provided with a first guide rail and a second guide rail in front of and behind the magnetizing lower mold. A first feeding component is slidably installed on the first guide rail, and a second feeding component is slidably installed on the second guide rail. The first feeding component and the second feeding component are connected by a connecting rod, and the second feeding component is connected to a stroke cylinder.

7. The mobile phone case back magnetization device according to claim 6, characterized in that, The base plate is equipped with a first guide post and a second guide post on both sides of the lower magnetizing mold. A pressure plate is slidably installed between the first guide post and the second guide post. The pressure plate is connected to the upper magnetizing mold. The tops of the first guide post and the second guide post are connected by a fixed beam. A motor that drives the pressure plate is installed on the fixed beam. The motor is connected to the pressure plate through a telescopic rod.

8. A type of aramid fiber strong magnetic mobile phone case, characterized in that, The device includes an aramid fiber inner shell layer, an aramid fiber outer shell layer, a sandwich layer, and a post-magnetized magnetic steel ring. The sandwich layer is cut with mounting ring grooves, and a non-magnetic magnetic steel ring is placed in the mounting ring grooves. The phone case is first formed under high temperature and high pressure and then placed in a post-magnetizing device to strongly magnetize the magnetic steel ring in the sandwich layer. The post-magnetizing device includes a magnetizing upper mold and a magnetizing lower mold. The magnetizing upper mold includes an upper magnetizing magnetic ring, and the magnetizing lower mold includes a lower magnetizing magnetic ring. The central axes of the upper magnetizing magnetic ring and the lower magnetizing magnetic ring are coaxial. During magnetization, the central axes of the upper magnetizing magnetic ring, the lower magnetizing magnetic ring, and the magnetic steel ring are all coaxial.

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