Magnetic back plate and manufacturing method thereof

Abstract

The invention discloses a magnetic back plate and a manufacturing method thereof. The magnetic back plate comprises a bottom plate and a magnetic assembly embedded in the bottom plate. The magnetic attraction assembly comprises a plurality of groups of magnets and a cover plate, and the magnets are bonded with the cover plate; the bottom plate comprises a first groove, a plurality of sets of second grooves are formed in the bottom of the first groove, the magnets are arranged in the second grooves and embedded into the second grooves, and the cover plate is arranged in the first groove and attached to the bottom of the first groove. The problems that an existing suspension magnetic backboard is not high in strength, prone to deformation and high in production cost are solved.

Description

Technical Field

[0001] The invention belongs to the technical field of electronic product accessories, and in particular relates to a magnetic back plate and a manufacturing method thereof. Background Art

[0002] With the changes in market demand and the development of technology, tablet computer auxiliary keyboards are becoming more and more diverse. Magnetic suspension uses built-in magnets to enable the tablet computer's suspended magnetic back panel to be quickly adsorbed and fixed to the tablet computer, ensuring that the tablet computer can be securely fixed in a specific position, such as on a desktop or stand, when in use, and will not slip or move. At present, the magnetic suspension back panel accessories of keyboards are injection molded with plastic as the material, but the strength of plastic products is low and they are easy to deform. The other is made by lamination process with multiple layers of electronic glass fiber cloth as the material. Although this type of back panel is light and large, the material and equipment costs are high, the investment is large, and it is not suitable for production without the support of large-scale orders. Summary of the invention

[0003] The technical problem solved by the present invention is: to provide a magnetic back plate and a manufacturing method thereof, so as to solve the problems of low strength, easy deformation and high production cost of the existing suspended magnetic back plate.

[0004] The technical solution of the present invention is: a magnetic attraction back plate provided by the present invention comprises a bottom plate and a magnetic attraction component embedded in the bottom plate;

[0005] The magnetic attraction assembly includes a plurality of groups of magnets and a cover plate, and the magnets are bonded to the cover plate;

[0006] The bottom plate includes a first groove, a plurality of groups of second grooves are arranged at the bottom of the first groove, the magnet is arranged in the second groove and is embedded in the second groove, and the cover plate is arranged in the first groove and is fitted with the bottom of the first groove.

[0007] Furthermore, a grid structure is provided on one side of the bottom plate facing the magnetic attraction component.

[0008] The present invention also provides a method for manufacturing a magnetic back plate, comprising:

[0009] Step 1: Cut the semi-cured PP and short fiber glass fiber raw materials respectively to obtain a first raw material and a second raw material;

[0010] Step 2: placing the magnet into an assembly jig, placing the assembly jig with the magnet into a glue dispenser, and applying glue to the magnet;

[0011] Step 3: taking out the glue-dispensed magnet and the assembly jig from the glue-dispensing machine, and covering the surface of the glue-dispensed magnet with a cover plate;

[0012] Step 4: Place the magnet covered with the cover plate and the assembly jig into a hot press for hot pressing and fixing to obtain an assembled magnetic attraction component, and remove the magnetic attraction component from the assembly jig;

[0013] Step 5: hot pressing the magnetic attraction component, the first raw material and the second raw material to obtain a semi-finished magnetic attraction back plate;

[0014] Step 6: Cut and mill the semi-finished magnetic back panel to obtain a finished magnetic back panel.

[0015] Furthermore, in step 2, the magnet is placed in the assembly jig, specifically: the magnet is placed in the third groove of the assembly jig, the magnet is engaged with the third groove, and the third groove has the same shape as the second groove on the bottom plate.

[0016] Furthermore, in step 2, the assembly jig equipped with the magnet is placed in a glue dispenser to dispense glue on the magnet, specifically:

[0017] The assembly jig is placed on the glue dispensing workbench of the glue dispensing machine, and the glue dispensing needle dispenses glue on the surface of the magnet placed in the assembly jig in sequence.

[0018] Furthermore, in step 5, the magnetic component, the first raw material and the second raw material are hot pressed to obtain a semi-finished magnetic backplane, specifically: the magnetic component, the first raw material and the second raw material are sequentially loaded onto the female mold of the hot pressing mold, and the pressure of the male mold of the hot pressing mold on the female mold is controlled by a CNC hydraulic press.

[0019] Furthermore, step 5 hot presses the magnetic attraction component, the first raw material and the second raw material to obtain a semi-finished magnetic attraction backplane, and also includes: a water cooling pipe and an oil heating pipe are provided in the hot pressing mold, and the water cooling pipe and the oil heating pipe are connected to the mold temperature controller to control the temperature of the hot pressing mold.

[0020] Furthermore, the water cooling pipe and the oil heating pipe are connected to a mold temperature controller to control the temperature of the hot pressing mold, specifically:

[0021] The hot pressing mold is maintained at a first preset temperature by the mold temperature controller, and the CNC hydraulic press is gradually increased to a first preset pressure to hot press the magnetic suction component, the first raw material and the second raw material. After maintaining the preset time, the temperature is slowly lowered to a second preset temperature, and the second preset pressure is maintained to hot press the raw materials to obtain a semi-finished magnetic suction backplane.

[0022] Furthermore, a preset area is provided on the edge of the semi-finished magnetic back plate, the width of the preset area is 1-2 mm, and a draft angle is provided on the contour of the semi-finished magnetic back plate, and the draft angle is 3°.

[0023] Furthermore, step 6 performs cutting and milling processing on the semi-finished magnetic backboard to obtain a finished magnetic backboard, specifically: placing the semi-finished magnetic backboard into a CNC machine to perform cutting and milling processing on the preset area to obtain a finished magnetic backboard.

[0024] The beneficial effects of the present invention are as follows: the magnetic component of the suspended magnetic backboard provided by the present invention is embedded in the base plate, and the magnet is provided with a special positioning groove and a cover plate to ensure its stability and firmness. The magnetic component and the base plate can be tightly combined without falling off or displacement; the manufacturing method of the magnetic backboard provided by the present invention adopts a hot pressing process for glass fiber short fiber raw materials, and the strength is between plastic and multi-layer glass fiber cloth, which meets the mechanical requirements of general magnetic backboard applications. The process can be carried out on conventional pressing equipment, without the need for expensive customized equipment, and the production cost is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0026] Figure 1 A schematic diagram of a magnetic backplane structure provided in an embodiment of the present application;

[0027] Figure 2 A schematic diagram of the assembly fixture structure provided in this embodiment;

[0028] Figure 3 A schematic diagram of the hot pressing mold structure provided in this embodiment;

[0029] Figure 4 A line graph of hot pressing forming parameters provided in this embodiment;

[0030] Figure 5 A schematic diagram of a top view of the semi-finished magnetic back plate provided in this embodiment;

[0031] Figure 6 for Figure 1 Schematic diagram of the draft angle structure of the middle and outer contours;

[0032] Description of reference numerals:

[0033] 1-base plate, 2-magnetic suction component, 3-assembly fixture, 4-hot pressing mold, 5-preset area;

[0034] 11-grid structure, 12-first groove, 13-second groove, 21-cover plate, 22-magnet, 31-third groove, 41-male mold, 42-female mold, 43-male mold pad, 44-female mold pad, 45-buffer spring, 46-oil heating pipeline, 47-water cooling pipeline. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] In the present invention, the terms "first", "second", etc. are mainly used to distinguish different devices, elements or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise specified, "plurality" means two or more.

[0037] The following is a detailed description of the implementation of the present invention in conjunction with the specific drawings:

[0038] Figure 1 A schematic diagram of a magnetic backplane structure provided in an embodiment of the present application, the magnetic backplane is a finished magnetic backplane, the magnetic backplane includes a base plate 1 and five groups of magnetic components 2 embedded in the base plate, each group of magnetic components 2 includes a cover plate 21 and magnets 22 arranged in an array, five groups of first grooves 12 are provided on the base plate 1, the shape of the first groove 12 corresponds to the shape of the cover plate 21, the bottom of the first groove 12 is provided with a second groove 13 arranged in an array, the magnet 22 is embedded in the second groove 13, the top of the magnet 22 is flush with the bottom of the first groove 12, the cover plate 21 is bonded to the magnet 22, and the bottom of the cover plate 21 is fitted with the bottom of the first groove 12. The array-arranged magnets are designed to make the magnetic field distribution more reasonable, which can not only ensure the adsorption force, but also avoid the local magnetic field being too strong to affect the circuits and components inside the tablet computer.

[0039] A grid structure 11 is provided on one side of the bottom plate 1 close to the magnetic attraction component 2. The grid structure is a rectangular grid. The grid structure can significantly improve the overall rigidity and bending resistance of the back plate by forming a grid-like support frame, making the back plate more stable when subjected to external forces. The grid structure adopts a hollow design. Compared with a solid back plate, it can reduce the amount of material used while ensuring strength, thereby reducing costs.

[0040] The present invention also provides a method for manufacturing a magnetic back plate, comprising:

[0041] Step 1: Cut the semi-cured PP and short fiber glass fiber raw materials respectively to obtain a first raw material and a second raw material;

[0042] Step 2: placing the magnet into an assembly jig, placing the assembly jig with the magnet into a glue dispenser, and applying glue to the magnet;

[0043] Step 3: taking out the glue-dispensed magnet and the assembly jig from the glue-dispensing machine, and covering the surface of the glue-dispensed magnet with a cover plate;

[0044] Step 4: Place the magnet covered with the cover plate and the assembly jig into a hot press for hot pressing and fixing to obtain an assembled magnetic attraction component, and remove the magnetic attraction component from the assembly jig;

[0045] Step 5: hot pressing the magnetic attraction component, the first raw material and the second raw material to obtain a semi-finished magnetic attraction back plate;

[0046] Step 6: Cut and mill the semi-finished magnetic back panel to obtain a finished magnetic back panel.

[0047] In step 1, the backboard 1 is made of two raw materials, semi-cured PP and short fiber glass fiber. The two raw materials are cut by a CNC vibrating knife cutting machine to obtain a first raw material and a second raw material. The first raw material includes a group of semi-cured PP materials, and the second raw material includes two groups of short fiber glass fibers. The short fibers are randomly distributed in the material, which helps to evenly disperse the external stress and reduce the risk of local stress concentration. The short fiber glass fiber can be evenly mixed with matrix materials such as resin and plastic, and is more suitable for various molding processes such as injection molding and compression molding.

[0048] Figure 2 A schematic diagram of an assembly jig structure is provided in an embodiment of the present application, wherein the assembly jig 3 includes third grooves 31 arranged in an array, the third grooves 31 corresponding to the positions of the second grooves 13, and chamfers are provided on the four corners of the third grooves 31 to facilitate the removal and placement of the magnet 22. The magnet 22 is placed in the third grooves 31 and engaged with the third grooves 31 to prevent the magnet 22 from shifting during the dispensing process.

[0049] Step 2: Place the magnet into the assembly jig, place the assembly jig with the magnet into the glue dispenser, and dispense glue on the magnet, specifically: place the magnet 22 into the third groove 31 of the assembly jig 3, place the assembly jig 3 with the magnet 22 on the glue dispensing workbench of the glue dispensing machine, and use the glue dispensing needle to dispense glue on the upper surface of the magnet 22 one by one. The glue dispensing glue uses HHD 8540 hot melt glue for easy bonding. Use the assembly jig to fix the magnet to ensure that the magnet maintains a stable position during the glue dispensing process and avoid position displacement, thereby improving the accuracy and consistency of glue dispensing; the use of the assembly jig simplifies the operation process, can achieve rapid clamping and positioning, and is suitable for mass production. The automated glue dispensing machine cooperates with the jig to operate continuously and significantly improve production efficiency. Using HHD 8540 hot melt glue dispensing can achieve rapid curing, improve bonding strength, and ensure a firm bond between the magnet and the bonding surface, effectively preventing it from falling off or shifting. The positioning of the fixture and the precise control of the dispensing needle can avoid glue overflow or uneven dispensing, reduce material waste and improve cost-effectiveness. Hot melt adhesive has no solvent volatilization, is environmentally friendly and safe, and helps create a safer working environment. The use of fixtures to fix magnets also reduces the complexity and error rate of manual operations. This process is suitable for integration into automated production lines, using the CNC system of the dispensing machine for programming control to achieve full automation of the dispensing process and improve the intelligence level of the production line.

[0050] Figure 3 A schematic diagram of the hot pressing mold structure provided for this embodiment; the hot pressing mold 4 includes a male mold 41 and a female mold 42 that are symmetrically buckled, and a water cooling pipe 46 and an oil heating pipe 47 are provided on the male mold 41 and the female mold 42. The water cooling pipe 46 and the oil heating pipe 47 are connected to the mold temperature controller to control the temperature of the hot pressing mold 4. A closed circulation loop is provided in the mold temperature controller. The heat-conducting medium flows through the heater or cooler under the promotion of the circulation pump, and then flows into the mold channel, taking away or transferring heat from the mold, and then returns to the mold temperature controller to continue the circulation. The mold temperature controller has a built-in precision temperature controller to monitor and adjust the temperature of the heat-conducting medium in real time. According to the set temperature, the temperature of the heat-conducting medium is adjusted by the heater or cooling system to keep the temperature of the mold stable.

[0051] Step 5: hot pressing the magnetic component, the first raw material and the second raw material to obtain a semi-finished magnetic back plate, specifically: the magnetic component, the first raw material and the second raw material are respectively loaded onto the hot pressing mold, and the raw materials are hot pressed to obtain the semi-finished magnetic back plate. The first raw material, the second raw material and the magnetic component are stacked from top to bottom on the mother mold 42 of the hot pressing mold 4, and then the CNC hydraulic press is started for hot pressing.

[0052] A male mold pad 43 and a buffer plate are provided on the side of the male mold 41 away from the female mold 42, and a female mold pad 44 and a buffer plate are provided on the side of the female mold 42 away from the male mold 41. A buffer spring 45 is also provided between the female mold pad 44 and the female mold 42. The hot pressing mold is placed on the workbench of the CNC hydraulic press, and the first raw material, the second raw material and the magnetic suction component are pressed together to form a semi-finished magnetic suction component by acting on the male mold 43. The CNC hydraulic press is used to generate and transmit pressure through a hydraulic system. The hydraulic system includes an oil pump, a hydraulic cylinder, a control valve and hydraulic oil. The oil pump converts mechanical energy into hydraulic energy and delivers high-pressure oil to the hydraulic cylinder through a pipeline. The numerical control system (CNC) accurately controls various parameters of the hydraulic press, such as pressure, speed, displacement, stroke, holding time, etc., through a pre-set program. The sensor feeds back data to the CNC system in real time for closed-loop control to ensure processing accuracy.

[0053] The design of the male mold pad, buffer plate, female mold pad and buffer spring can effectively absorb pressure changes and ensure that the pressure is evenly distributed on both sides of the mold, preventing damage or deformation of the material due to local overpressure. This makes the pressure during the hot pressing process more uniform, thereby ensuring the quality of the semi-finished magnetic suction component. The buffer plate and buffer spring effectively reduce the impact force and pressure between the molds, avoiding the damage to the mold and the raw material caused by the impact of hard objects. The buffer device can protect the mold surface and extend the service life of the mold, while preventing the raw material from being damaged by uneven pressure during the pressing process. By adjusting the stiffness of the buffer spring, the pressure applied by the mold on the raw material can be accurately controlled, so that the first raw material, the second raw material and the magnetic suction component can be evenly compressed, and all the raw materials in the molding process can be fully integrated, and finally a high-quality semi-finished magnetic suction component is formed. The design of the male and female mold pads can effectively reduce the deformation of the mold during the pressurization process, avoid the problem of inaccurate size caused by mold relaxation or deformation, and ensure the size and shape accuracy of the molded semi-finished product. Due to the design of the buffer device, defects such as bubbles and cracks caused by uneven pressure are avoided, and the stability of the production process and the consistency of the product are improved. By setting the buffer plate and buffer spring, the vibration or instability of the mold caused by pressure changes is reduced, thereby improving the stability of the hot pressing process, ensuring efficient and high-quality pressing in each production, and shortening the production cycle.

[0054] Figure 4 The hot pressing molding parameter line chart provided for this embodiment; the CNC hydraulic press and the mold temperature controller cooperate to control the pressure and temperature as shown in the following table:

[0055] Serial number Temperature ℃ Time Pressure bar 1 125-130 15 30 2 125-130 15 35 3 125-130 10 40 4 125-130 5 40 5 125-130 500 70 6 100 95 60

[0056] The hot pressing mold is kept at the first preset temperature by the mold temperature controller, and the CNC hydraulic press is gradually raised to the first preset pressure to hot press the magnetic suction component, the first raw material and the second raw material. After the preset time, the temperature is slowly lowered to the second preset temperature, and the raw materials are hot pressed at the second preset pressure to obtain a semi-finished magnetic suction backplane. The temperature of the hot pressing mold is precisely controlled by the mold temperature controller, which helps the raw materials to be heated evenly at the optimal temperature, thereby improving the fluidity and bonding properties of the raw materials, ensuring high product molding quality, and reducing defects such as bubbles, cracks or deformation. Accurate time control: By presetting the hot pressing time, the raw materials are ensured to complete curing and molding within the optimal time, avoiding quality problems caused by overpressure or underpressure, and shortening the production cycle, which is suitable for mass production. It can accurately control pressure and displacement to ensure the dimensional stability and consistency of the magnetic suction backplane during the molding process, reducing the need for subsequent processing. Through the process of gradually increasing pressure and cooling, it is ensured that the magnetic suction component and the material of the backplane are tightly combined, thereby maintaining or optimizing the magnetic suction characteristics and avoiding the influence of temperature or pressure changes on the magnetic properties. The first raw material and the second raw material may have different thermal expansion coefficients or melting points. Through segmented temperature and pressure control, the hot pressing process can be optimized for different material properties to ensure that they can be stably combined. Accurate temperature and pressure control reduces the production of defective products, thereby reducing raw material waste and rework costs, and reducing production costs.

[0057] Figure 5 This is a structural schematic diagram of a semi-finished magnetic back panel provided in an embodiment of the present application, wherein a preset area is provided at the edge of the semi-finished magnetic back panel, and the width of the preset area is 1-2 mm, and preferably the width of the preset area is 1.5 mm.

[0058] Figure 6 for Figure 5 Schematic diagram of the draft angle structure of the middle and outer contours; there is a 3° draft angle between the upper and lower molds of the outer contour of the magnetic back panel, and the product is easily scratched or deformed during demolding. The existence of the draft angle can ensure smooth demolding of the product and maintain the integrity of the appearance.

[0059] Step 6: Cut and mill the semi-finished magnetic backplane to obtain the finished magnetic backplane, specifically: put the semi-finished magnetic backplane into the CNC machine to cut and mill the preset area to obtain the finished magnetic backplane. CNC machining (Computer Numerical Control machining) is a process of using a CNC machine to control machine tools to perform precision machining such as material cutting, drilling, engraving, and milling. Through pre-written CNC programs, various complex machining tasks can be automatically completed, with the advantages of high precision, high efficiency, and good repeatability.

[0060] After step 6, product quality inspection is also included, specifically:

[0061] Quality inspection of magnetic components: Use a magnetometer or magnetic strength tester to test whether the magnetic component's suction meets the design requirements. Check whether the magnetism is evenly distributed to ensure that the back panel can be evenly adsorbed and remain stable during use. Check the magnetic component for scratches, cracks, bubbles and other defects through visual inspection or microscope magnification.

[0062] The quality inspection of the backplane uses precision instruments to measure the thickness, length, width and other dimensions of the backplane material to ensure that it meets the design standards. Such as bending strength, tensile strength, temperature resistance, moisture resistance, etc., to ensure the durability of the backplane material in actual applications. The surface finish of the backplane is checked by instruments such as gloss meters to prevent surface defects from affecting subsequent processes and assembly.

[0063] Obviously, the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

[0064] Note that in the description of this specification, the description with reference to the terms "some embodiments", "other embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

Claims

1. A magnetic back plate, characterized in that: It includes a bottom plate and a magnetic attraction component embedded in the bottom plate; The magnetic attraction assembly includes a plurality of groups of magnets and a cover plate, and the magnets are bonded to the cover plate; The bottom plate includes a first groove, a plurality of groups of second grooves are arranged at the bottom of the first groove, the magnet is arranged in the second groove and is embedded in the second groove, and the cover plate is arranged in the first groove and is fitted with the bottom of the first groove.

2. A magnetic back plate as claimed in claim 1, characterized in that: A grid structure is provided on one side of the bottom plate facing the magnetic attraction component.

3. A method for manufacturing a magnetic back plate, characterized in that: include: Step 1: Cut the semi-cured PP and short fiber glass fiber raw materials respectively to obtain a first raw material and a second raw material; Step 2: placing the magnet into an assembly jig, placing the assembly jig with the magnet into a glue dispenser, and applying glue to the magnet; Step 3: taking out the glue-dispensed magnet and the assembly jig from the glue-dispensing machine, and covering the surface of the glue-dispensed magnet with a cover plate; Step 4: Place the magnet covered with the cover plate and the assembly jig into a hot press for hot pressing and fixing to obtain an assembled magnetic attraction component, and remove the magnetic attraction component from the assembly jig; Step 5: hot pressing the magnetic attraction component, the first raw material and the second raw material to obtain a semi-finished magnetic attraction back plate; Step 6: Cut and mill the semi-finished magnetic back panel to obtain a finished magnetic back panel.

4. The method for manufacturing a magnetic back plate according to claim 3, characterized in that: In step 2, place the magnet into the assembly fixture, specifically: The magnet is placed in the third groove of the assembly fixture, and the magnet is embedded in the third groove. The third groove has the same shape as the second groove on the bottom plate.

5. The method for manufacturing a magnetic back plate according to claim 3, characterized in that: In step 2, the assembly jig with the magnet is placed in a glue dispenser, and glue is dispensed on the magnet, specifically: The assembly jig is placed on the glue dispensing workbench of the glue dispensing machine, and the glue dispensing needle dispenses glue on the surface of the magnet placed in the assembly jig in sequence.

6. The method for manufacturing a magnetic back plate according to claim 3, characterized in that: In step 5, the magnetic attraction component, the first raw material and the second raw material are hot-pressed to obtain a semi-finished magnetic attraction backplane, specifically: The magnetic attraction component, the first raw material and the second raw material are sequentially loaded onto the female mold of the hot pressing mold, and the pressure of the male mold of the hot pressing mold on the female mold is controlled by a CNC hydraulic press.

7. The method for manufacturing a magnetic back plate according to claim 6, characterized in that: Step 5 hot presses the magnetic component, the first raw material and the second raw material to obtain a semi-finished magnetic backplane, and also includes: a water cooling pipe and an oil heating pipe are provided in the hot pressing mold, and the water cooling pipe and the oil heating pipe are connected to a mold temperature controller to control the temperature of the hot pressing mold.

8. The method for manufacturing a magnetic back plate according to claim 7, characterized in that: The water cooling pipe and the oil heating pipe are connected to the mold temperature controller to control the temperature of the hot pressing mold, specifically: The hot pressing mold is maintained at a first preset temperature by the mold temperature controller, and the CNC hydraulic press is gradually increased to a first preset pressure to hot press the magnetic suction component, the first raw material and the second raw material. After maintaining the preset time, the temperature is slowly lowered to a second preset temperature, and the second preset pressure is maintained to hot press the raw materials to obtain a semi-finished magnetic suction backplane.

9. The method for manufacturing a magnetic back plate according to claim 8, characterized in that: A preset area is provided on the edge of the semi-finished magnetic back plate, and the width of the preset area is 1-2 mm. A draft angle is provided on the contour of the semi-finished magnetic back plate, and the draft angle is 3°.

10. The method for manufacturing a magnetic back plate according to claim 9, characterized in that: Step 6: Cut and mill the semi-finished magnetic back plate to obtain a finished magnetic back plate, specifically: The semi-finished magnetic back plate is placed on a CNC machine to perform cutting and milling on the preset area to obtain a finished magnetic back plate.

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