Manufacturing method of magnetic type protective backboard

Abstract

The invention relates to the technical field of electronic product accessories, and discloses a manufacturing method of a magnetic type protective backboard, which comprises the following steps: S1, material preparation: respectively carrying out size design, material selection and cutting molding on the magnetic type protective backboard according to requirements; s2, protective main board forming, wherein a surface layer main board and a middle layer main board are subjected to hot press forming; s3, machining is conducted; s4, magnetic attraction parts are installed and fixed, specifically, the magnetic attraction parts are arranged in the corresponding assembling grooves respectively, and hot pressing is carried out to solidify the glue; and S5, mounting and fixing the cover plates: continuously dispensing glue on each magnetic attraction part of the protection main plate in the step S4, and respectively placing the cover plates in the corresponding assembly grooves for hot pressing. The protection main board, the magnetic attraction part and the cover plate of the magnetic attraction type protection backboard are subjected to forming hot pressing, the situation that due to the existence of the magnetic attraction part, the hot pressing thickness is different, and the final effect is affected is prevented, the reject ratio of the magnetic attraction type protection backboard is reduced, the quality of the magnetic attraction type protection backboard is improved, and the thickness of the corresponding position of the magnetic attraction part is controllable.

Description

Technical Field

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

[0002] The protective back panel of electronic products is a product that provides protection for electronic products. It is usually used to protect the back of electronic devices such as smartphones and tablets. It can effectively prevent the device from external damage such as scratches and collisions, thereby extending the service life of electronic products and maintaining their appearance intact.

[0003] The magnetic protective back panel is a product that uses magnetic adsorption technology to provide protection for electronic products. It is usually used to protect the back of electronic devices such as smartphones and tablets. The back panel is tightly attached to the back of the device through magnetic force to provide protection against dust, scratches, and falls.

[0004] With the changes in market demand and the development of technology, the materials and designs of tablet computer protective cases have begun to diversify. The current magnetic protective back panels are usually made by laminating multiple layers of materials. The magnetic sheet and other material layers are laminated together, and the layered materials at the location of the magnetic sheet are changed in density and thickness. During the production process of the back panel, the back panel is prone to unevenness after lamination, which not only affects the appearance of the back panel, but also affects the overall use of the back panel, so that the back panel cannot be fully attached to the back of the electronic product, thereby reducing the protective effect of the electronic product. Summary of the invention

[0005] In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is: to provide a method for manufacturing a magnetic protective back plate to solve the problem that the magnetic protective back plate becomes uneven after lamination and installation of the magnetic part.

[0006] In order to solve the above technical problems, a technical solution adopted by the present invention is: providing a method for manufacturing a magnetic protective back plate, comprising the following steps:

[0007] S1. Material preparation: Based on the magnetic protective backplane, the protective mainboard, the magnetic part and the cover plate are designed in size, selected in materials and cut into shape according to the requirements;

[0008] S2, forming the protective mainboard: stacking the two surface mainboards and at least one intermediate mainboard sandwiched between the two surface mainboards, which are included in the protective mainboard designed and formed in step S1, in sequence, and placing them in a hot pressing mold for hot pressing to form an integrated protective mainboard, cooling the hot-pressed protective mainboard, and taking it out from the hot pressing mold after the temperature drops;

[0009] S3, mechanical processing: positioning the protective mainboard formed by hot pressing in step S2 through a first clamping fixture, and mechanically processing the protective mainboard on the first clamping fixture using a lathe;

[0010] S4, installation and fixation of the magnetic attraction part: transfer the protective mainboard processed in step S3 to a second clamping fixture and position the protective mainboard, dispense glue into a plurality of assembly grooves formed after hot pressing on the protective mainboard, place each magnetic attraction part in the corresponding assembly groove, and use a hot pressing device to hot press the magnetic attraction part on the second clamping fixture to solidify the glue;

[0011] S5. Installation and fixation of the cover plate: continue to apply glue to each of the magnetic suction parts of the protective mainboard in step S4, and place the cover plates in the corresponding assembly grooves respectively, and use a hot pressing device to hot press the cover plates on the second clamping fixture to solidify the glue.

[0012] According to the above method, the magnetic protective back plate is divided into a protective main board, a magnetic part and a cover plate. After the protective main board is hot-pressed separately, the magnetic part and the cover plate are sequentially pasted on the protective main board and hot-pressed separately. In this way, the magnetic part and the cover plate can be adjusted as needed according to the thickness of the protective main board, avoiding the bulge at the position of the magnetic part after hot pressing, thereby ensuring the quality of the entire magnetic protective back plate.

[0013] Furthermore, in the step S1, the draft angle of the outer sides of the two stacked surface layer main boards and the middle layer main board is 4 to 6 degrees, and a 1.5 mm margin is added to each side of each surface layer main board and the middle layer main board.

[0014] According to the above method, it is convenient to demould during hot pressing, and the setting of the remaining part is convenient for subsequent processing.

[0015] Furthermore, the hot pressing mold includes an upper mold and a lower mold that can be interlocked with each other, the top of the lower mold is concavely provided with a molding cavity consistent with the shape contour of the protective main board, the bottom of the upper mold is convexly provided with a pressure plate for blocking one side of the molding cavity opening, and a heating unit for heating the molding cavity and the pressure plate is provided between the upper mold and the lower mold; in step S2, the two stacked surface layer main boards and the middle layer main board are placed in the molding cavity, the pressure plate is extended into the molding cavity and presses the surface layer main board and the middle layer main board in the molding cavity, the heating unit is started and heats the molding cavity until the protective main board is formed, thereby realizing hot pressing molding.

[0016] Furthermore, the heating unit includes a first heating part and a first water-cooling part arranged on the lower mold, and a second heating part and a second water-cooling part arranged on the upper mold; in step S2, the first heating part and the second heating part are started to heat the molding cavity, and the first water-cooling part and the second water-cooling part control the temperature in the molding cavity through heat exchange to ensure that the temperature during hot pressing remains constant to avoid overheating.

[0017] Furthermore, a side surface of the protective mainboard having the device groove is defined as a processing surface, and the first clamping fixture has a first working surface for supporting the protective mainboard and adapted to the processing surface; in step S3, the first clamping fixture positions the protective mainboard by vacuum adsorption, and then cuts the protective mainboard, the excess part is cut off, and each corner is rounded.

[0018] According to the above method, the excess part is cut through cutting processing until the possible defects at the edge are removed and trimmed, thereby increasing the possibility of modification and ensuring the quality of the final product.

[0019] Furthermore, the second clamping fixture has a second working surface for supporting the protective main board, a working area adapted to the processing surface is formed on the second working surface, and a first positioning structure for limiting the movement of the protective main board in the horizontal direction is provided on the second working surface and outside each side edge of the working area, and a avoidance groove extending into the working area is recessed on the outer side edge of the second clamping fixture; in step S4, one side of the processing surface of the protective main board is facing and attached to the working area, and each of the first positioning structures limits the movement of the protective main board in the horizontal direction to position the protective main board.

[0020] Furthermore, each of the assembly grooves is recessed with a plurality of independent secondary grooves, and the magnetic attraction parts are arranged in each secondary groove corresponding to the secondary grooves; the hot pressing device includes a first frame, a supporting part arranged on the first frame, a holding part arranged on the first frame and located above the supporting part, and a third heating part arranged on the bottom of the holding part and adapted to the assembly groove and the secondary groove, and a second positioning structure for positioning the second clamping fixture is provided on the supporting part; in step S4, after the installation of the magnetic attraction part is completed, the second clamping fixture is matched with the second positioning structure to be installed on the supporting part, and the holding part drives the started third heating part to move in a vertical direction toward each magnetic attraction part until it is pressed on each magnetic attraction part and heats each magnetic attraction part for a certain period of time, and then the third heating part is turned off and the holding part is reset, so that the glue between the magnetic attraction part and the protective mainboard is quickly solidified to complete the hot pressing between the magnetic attraction part and the protective mainboard alone.

[0021] Furthermore, a first through-hole is formed on the second clamping fixture at a position vertically opposite to each device slot, and the supporting part includes an elastic supporting part arranged on the first frame and a fixed supporting part arranged on the first frame and arranged on both sides of the elastic supporting part, the top surface of the elastic supporting part has a first supporting surface for supporting the second clamping fixture, the second positioning structure is arranged on the first supporting surface, and a supporting block for movably inserting into the first through-hole is convexly formed on the fixed supporting part at a position corresponding to the first through-hole, the top surface of each of the supporting blocks has a second supporting surface adapted to the shape of each assembly groove for supporting the protective mainboard, and the pressing part has upper and lower convexly formed pressing surfaces for respectively pressing each magnetic suction part; in step S4, after the second clamping fixture is installed on the first supporting surface, the elastic supporting part elastically supports it, and the pressing part drives the third heating part to press down the second clamping fixture until the protective mainboard abuts against the second supporting surface, and each of the second supporting surfaces is respectively opposite to each assembly groove.

[0022] According to the above method, the elastic support part ensures the height position of the protective mainboard, and the fixed support part ensures the stability of the support at the device groove, so that the pressing part and the second support surface cooperate to only hot-press the magnetic suction part and the assembly groove, avoiding adverse effects on other positions of the protective mainboard.

[0023] Furthermore, the support portion also includes a sliding portion arranged between the two fixed support portions, and the elastic support portion is connected to the sliding portion. In step S4, the sliding portion is used to drive the elastic support portion to move in a horizontal direction when installing and removing the second clamping fixture, thereby facilitating the installation and disassembly of the second clamping fixture.

[0024] Furthermore, the hot pressing device also includes an alarm arranged on the first frame. In step S4, when the hot pressing device fails, the alarm sounds an alarm to facilitate timely discovery and repair, thereby avoiding deeper damage to the equipment and stopping the loss in time.

[0025] The manufacturing method of the magnetic protective backplane of the present invention has at least the following beneficial effects: by separately molding and hot-pressing the protective main board, the magnetic part and the cover plate of the magnetic protective backplane, it is prevented that the different hot-pressing thicknesses caused by the presence of the magnetic part will affect the final effect, the defective rate of the magnetic protective backplane is reduced, the quality is improved, and the thickness at the corresponding position of the magnetic part is controllable. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0027] Figure 1It is a flowchart of the manufacturing method of the magnetic protective back plate of the present invention;

[0028] Figure 2 It is a structural schematic diagram of the magnetic protective back plate of the present invention;

[0029] Figure 3 An exploded view of the magnetic protective back plate of the present invention;

[0030] Figure 4 for Figure 3 An enlarged view of section A is shown;

[0031] Figure 5 An exploded view of the protective mainboard of the present invention;

[0032] Figure 6 It is a partial cross-sectional view of the magnetic protective back plate of the present invention;

[0033] Figure 7 It is a structural schematic diagram of the hot pressing mold of the present invention;

[0034] Figure 8 It is a structural schematic diagram of the upper mold of the present invention;

[0035] Fig. 9 It is a schematic diagram of the upper mold, the stacked protective main board and the lower mold after being separated according to the present invention;

[0036] Fig.10 is a side sectional view of a hot pressing mold of the present invention;

[0037] Fig.11 It is a structural schematic diagram of a first clamping fixture of the present invention;

[0038] Fig.12 It is a partial front cross-sectional view of the first clamping fixture of the present invention;

[0039] Fig.13 It is a schematic diagram of the matching structure of the hot pressing device and the second clamping fixture of the present invention;

[0040] Fig.14 It is a structural schematic diagram of the support portion, the pressing portion and the second clamping fixture of the present invention in a state where the pressing portion and the second clamping fixture are separated;

[0041] Fig.15 for Fig.14 An enlarged view of portion B is shown;

[0042] Fig.16 It is a schematic diagram of the structure of the support part and the second clamping fixture of the present invention;

[0043] Fig.17 It is a schematic structural diagram of the support portion of the present invention.

[0044] The meanings of the symbols in the accompanying drawings are:

[0045] Protective main board-1; assembly groove-11; step surface-111; secondary groove-112; processing surface-12; rib-13; connection hole-14; surface main board-15a; middle main board-15b; first main board-151; second main board-152; third main board-153; fourth main board-154; profiling opening-155; avoidance perforation-16; folding structure-17;

[0046] Magnetic attraction part-2;

[0047] Cover-3;

[0048] Upper mold-4; pressing plate-41; top plate-42; pad-43; second heat insulation plate-44; male mold-45; positioning hole-46; male mold-47;

[0049] Lower mold-5; molding cavity-51; first base-52; bottom plate-521; side plate-522; mounting groove-523; first heat insulation plate-53; mother mold-54; forming groove-541; molding protruding structure-542; ejector pin-55; connecting plate-551; height limiting block-561; first positioning column-562; movable block-563;

[0050] Heating unit-6; first heating part-61; second heating part-62; first water cooling part-63; second water cooling part-64;

[0051] first clamping fixture-7; second base-71; protrusion-72; air cavity-73; air hole-74; first working surface-7a;

[0052] The second clamping fixture-8; the third base-81; the second working surface-82; the first positioning structure-83; the second positioning column-831; the limit block-832; the avoidance groove-84; the third positioning hole-85; the first through hole-96;

[0053] Hot pressing device-9; first frame-91; universal wheel-911; enclosure-912; support part-92; second positioning structure-921; third positioning column-9211; elastic support part-922; first fixing block-9221; support plate-9222; spring-9223; first supporting surface-9224; guide column-9225; guide hole-9226; fixed support part-923; fourth base-9231; third heat insulation board-9232; first connecting plate-9233 ; Support block-9234; Second support surface-9235; Sliding part-924; Slide rail-9241; Sliding block-9242; First driving member-9243; Connecting strip-9244; Holding part-93; Bracket-931; Control box-9311; Second driving member-932; Second connecting plate-933; Fourth heat insulation plate-934; Third heating part-94; Heating plate-941; Thermocouple-942; Holding block-943; Holding foot-9431; Alarm-95. DETAILED DESCRIPTION

[0054] The present invention will be further described below in conjunction with the accompanying drawings.

[0055] like Figures 1 to 17 As shown, the present invention provides a method for manufacturing a magnetic protective backplane. The manufacturing method involves the design of a magnetic protective mainboard itself and a magnetic protective mainboard manufacturing system for manufacturing the magnetic protective mainboard. The manufacturing method is implemented in cooperation with the magnetic protective mainboard manufacturing system. The magnetic protective mainboard manufacturing system includes a hot pressing mold, a first clamping fixture 7, a second clamping fixture 8 and a hot pressing device 9.

[0056] like Figures 2 to 6 As shown, the magnetic protection back plate of the present invention comprises a protection main board 1 adapted for electronic products, a magnetic attraction portion 2 arranged in the protection main board 1, and a cover plate 3 arranged on the protection main board 1 to block the magnetic attraction portion 2. The protection main board 1 is used to protect the electronic products, and the magnetic attraction portion 2 is convenient for magnetic attraction with the metal structure or magnetic attraction structure on the electronic products to increase the tightness of the connection between the protection back plate and the electronic products and increase the protection stability. The cover plate 3 is convenient for the installation of the magnetic attraction portion 2. The electronic products described in this embodiment include but are not limited to tablet computers, and the protection main board 1 is used to protect the back shell of the tablet computer.

[0057] In this embodiment, a plurality of assembly slots 11 adapted to the magnetic attraction structure corresponding to the electronic product are concavely provided on one side of the protective mainboard 1 corresponding to the electronic product, and the size, shape and position of each assembly slot 11 are different. The side of the protective mainboard 1 on which the assembly slot 11 is concave is defined as the processing surface 12, and the other side of the protective mainboard 1 is defined as the back surface, which is a plane, and ribs 13 with a grid-like structure are convexly provided on the processing surface 12 of the protective mainboard 1, and each assembly slot 11 is located on the part surrounded by the inner side of each rib 13, and each rib 13 constitutes a part of the assembly slot 11 so that the notch position of the assembly slot 11 is flush with the rib 13, so as to reduce the contact between the processing surface 12 and the object surface during subsequent processing or use, thereby increasing the protection effect. Since the shapes and sizes of each assembly slot 11 are different, in order to facilitate the production and installation of the magnetic attraction part 2, a plurality of independent sub-slots 112 are concavely formed in each assembly slot 11, and each sub-slot 112 can be a square slot, or other shapes that are convenient for forming and opening. In order to facilitate the arrangement and installation of the cover plate 3, a stepped surface 111 is formed between the notch of each secondary groove 112 and the notch of the assembly groove 11, so that the total outer circumference of each secondary groove 112 in each assembly groove 11 is formed with a stepped surface 111 around the notch of the assembly groove 11, and the stepped surface 111 is flush with the notch of each secondary groove 112, so that the cover plate 3 can be abutted against the notch and the stepped surface 111 of each secondary groove 112 when installed in the assembly groove 11. A connecting hole 14 is formed through the protective main board 1, which can be easily connected with other structures in subsequent processing and production. An avoidance structure is provided on the protective main board 1 corresponding to the through structure of the electronic product, and the avoidance structure is an avoidance perforation 16, so as to facilitate the adaptation of other electronic parts. An integrally formed folding structure 17 is convexly provided along the width direction on the edge where one of the long sides of the protective main board 1 is located. The folding structure 17 is designed to be assembled with the edge part of a similar product, so as to form a folded edge with other protective structures in subsequent processing.

[0058] In the content defined in this embodiment, the protective main board 1 includes two-layer main boards 15a and at least one intermediate main board 15b sandwiched between the two-layer main boards 15a, which are stacked and hot-pressed. The two-layer main boards 15a include a first main board 151 and a second main board 152, and the intermediate main board 15b includes a third main board 153 and a fourth main board 154. The third main board 153 is located on the side close to the first main board 151, and the fourth main board 154 is located on the side close to the second main board 152, so that the first main board 151, the third main board 153, the fourth main board 154 and the second main board 152 are arranged in sequence. In this embodiment, the first main board 151, the second main board 152, the third main board 153 and the fourth main board 154 are all rectangular sheet structures and are stacked in sequence. Among them, the first main board 151 and the third main board 153 are both semi-cured sheet materials, specifically plain PP-2116, fiber tow 23.6*22.8, fiber cloth thickness 0.084mm, fiber weight 103±3 (g / m2), resin content 45~49 (by wt%), density 1.8~2.0 (g / cm3), PP weight 206~224 (g / m2), titanium dioxide 3~5% (by wt%), molding thickness 0.10mm. The second main board 152 and the fourth main board 154 are both long fiber materials, specifically sheet molding materials, type Chopped-12.5mm, specification HT301512-1.5, density 1.5g / cm 3, resin content 50%, fiber content 30%, glass beads 12%, other 8%, flame retardant grade UL94HB. The combination of long fiber material and prepreg is not only strong and durable, but also has low material cost and is easy to manufacture. In this embodiment, after the first main board 151, the third main board 153, the fourth main board 154 and the third main board 153 are stacked, and before hot pressing, one side of the first main board 151 is used as the parting line, and the four outer sides of the stacked first main board 151, the third main board 153, the fourth main board 154 and the second main board 152 form a draft angle of 4 to 6° from one side of the parting line to the other side along the thickness direction, preferably 5°, for easy demolding, and the draft angle is 0° after hot pressing. To facilitate subsequent fine processing, the length and width of each of the first main board 151, the second main board 152, the third main board 153 and the fourth main board 154 are 3 mm longer than the length and width of the magnetic electronic product protective back panel after processing, so that each side of the first main board 151, the second main board 152, the third main board 153 and the fourth main board 154 has a 1.5 mm margin, which is convenient for cutting during subsequent mechanical fine processing. During cutting, the four corners of the protective main board 1 are chamfered. In order to facilitate the formation of the step surface 111 and the notch of the assembly groove 11 and reduce the difficulty of hot pressing, a plurality of profiling openings 155 are opened through the second main board 152 at the position corresponding to the magnetic attraction structure of the electronic product. The shape of each profiling opening 155 is adapted to the magnetic attraction structure of the electronic product, and each profiling opening 155 forms the notch portion of the assembly groove 11 after the first main board 151, the second main board 152, the third main board 153 and the fourth main board 154 are hot-pressed, while the fourth main board 154, the first main board 151 and the second main board 152 cooperate to form the secondary groove 112 portion.

[0059] In this embodiment, the number and size of the magnetic attraction parts 2 are arranged in one-to-one correspondence with the number and size of each secondary slot 112. A magnetic attraction part 2 is provided in each secondary slot 112. The magnetic attraction part 2 is a magnet that can be magnetically matched with metal or other magnetic attraction structures. The magnet is a square block structure or a sheet structure, and it is divided into small blocks to facilitate the setting of various shapes.

[0060] In this embodiment, the cover plates 3 are arranged one by one at the notches of the assembly slots 11 to block the magnetic attraction parts 2 in each secondary slot 112 and the notches of the assembly slots 11, to prevent the magnetic attraction parts 2 from being directly exposed, and to protect the magnetic attraction parts 2. At the same time, the arrangement of the cover plates 3 enables the magnetic attraction parts 2 to be installed on the protective main board 1 after the protective main board 1 is hot-pressed, which is more convenient to assemble than the existing protective plates, and can also avoid the unevenness caused by the hot pressing of the magnetic attraction parts 2 as needed. The cover plates 3 are made of metal materials such as steel, and the material is N45SH-100RC, which is not magnetized, to ensure the protection of the magnetic attraction parts 2. The cover plates 3 can be arranged to be consistent with the number of secondary slots 112. Preferably, one cover plate 3 is arranged corresponding to each assembly slot 11. For this reason, the shape of the cover plates 3 is consistent with the shape of the assembly slots 11, so that when the magnetic attraction parts 2 are installed in the secondary slots 112, they can be installed in the assembly slots 11 to block the magnetic attraction parts 2 in each secondary slot 112. The cover plate 3 is pasted on the magnetic part 2 and the stepped surface 111 by gluing. The glue uses a two-component AB glue of model HHD 8190R, with an A:B mixing ratio of 10:1, so that it can be cured after hot pressing to stick to the cover plate 3. The magnetic part 2 is also glued in the secondary groove 112. It should be noted that the depth of the notch of the assembly groove 11, that is, the depth between the stepped surface 111 and the outer rib 13 of the notch of the assembly groove 11 is greater than or equal to the thickness of the cover plate 3, so that the cover plate 3 does not protrude from the rib 13.

[0061] like Figures 7 to 10 As shown, the hot pressing mold of the present invention includes an upper mold 4, a lower mold 5 and a heating unit 6. The upper mold 4 and the lower mold 5 can be interlocked to enclose a cavity structure that is completely consistent with the outer contour of the magnetic electronic product protection mainboard 1. The first mainboard 151, the third mainboard 153, the fourth mainboard 154 and the second mainboard 152 stacked in sequence are placed in the corresponding cavity structure, and the upper mold 4 and the lower mold 5 are heated by the heating unit 6 to heat the mainboards in the cavity structure until the protection mainboard 1 is hot-pressed into shape. In this embodiment, a molding cavity 51 consistent with the contour of the protective main board 1 is formed on the top of the lower mold 5, that is, the molding cavity 51 is adapted to the outer contour structure and size of the protective main board 1, and a pressure plate 41 capable of blocking one side of the opening of the molding cavity 51 is correspondingly convexly provided on the bottom of the upper mold 4, so that after each main board is stacked in the molding cavity 51, the pressure plate 41 blocks the opening of the molding cavity 51 and presses each main board by buckling the upper mold 4, and the heating unit 6 is used to heat the molding cavity 51 and the pressure plate 41 to ensure comprehensive, sufficient and uniform heating, thereby improving the effect and quality of hot pressing.

[0062] In this embodiment, the lower mold 5 includes a first base 52, a first heat insulation board 53, a mother mold 54 and a ejector pin 55 which are arranged in sequence from bottom to top. The first base 52 is used to support the mother mold 54. The first heat insulation board 53 prevents the high temperature during hot pressing from being transmitted to the first base 52 and the workbench for placing the first base 52, which affects the service life. The molding cavity 51 is formed on the mother mold 54 for cooperation with the upper mold 4 for hot pressing molding. The ejector pin 55 facilitates the separation of the protective main board 1 which is closely attached to the molding cavity 51 after hot pressing molding.

[0063] In the content defined in this embodiment, the first base 52 includes a bottom plate 521 and two side plates 522 spaced apart on the top surface of the bottom plate 521, the side plates 522 are arranged in parallel and make the first base 52 present a "concave" shape, so that a concave installation groove 523 is formed between the top surface of the bottom plate 521 and the side plates 522, the two sides of the installation groove 523 are through-set along the length direction of the side plates 522, and the side plates 522 are arranged in parallel along the width direction thereof. The top of the installation groove 523 is open and arranged directly opposite to the mother mold 54 and the molding cavity 51 on the mother mold 54.

[0064] In the content defined in this embodiment, the first insulation board 53 is a rectangular sheet or block structure. The first insulation board 53 adopts insulation materials such as cotton rock board, and the width of the first insulation board 53 is greater than the width between the two side plates 522. The two sides of the first insulation board 53 are respectively placed on the top surface of the two side plates 522 so that the cover plate 3 is covered above the installation groove 523.

[0065] In the content defined in this embodiment, the mother mold 54 is directly placed or fixedly installed on the top surface of the first heat insulation board 53, so as to block the temperature transfer of the mother mold 54 to a certain extent. The mother mold 54 is a rectangular block structure, and a forming groove 541 is formed on the top surface of the mother mold 54. The length and width of the forming groove 541 are the same as the length and width of the second main board 152. A forming protrusion structure 542 that is completely consistent with the shape of the processing surface 12 of the protective main board 1 is formed on the bottom surface of the forming groove 541. The forming protrusion structure 542 includes various partial structures corresponding to each assembly groove 11, rib 13 and avoidance through hole 16. The bottom surface of the forming groove 541 is also adapted to the remaining part of the first main board 151, the second main board 152, the third main board 153 and the fourth main board 154, so that the second main board 152 can be placed in the forming groove 541 more adaptably. The side of the forming groove 541 is adapted to the draft angle of the protective main board 1 and the bottom angle is 95° to facilitate demoulding after molding. The forming cavity 51 is formed at the bottom of the forming groove 541. When the upper mold 4 and the mother mold 54 are interlocked and combined with the upper mold 4 contacting the top surface of the mother mold 54, the pressing plate 41 is suspended in the forming groove 541. At this time, the forming groove 541 part from the bottom surface of the pressing plate 41 and below is the forming cavity 51. The pressing plate 41 is also located at the cavity mouth of the forming cavity 51. The forming groove 541 also provides space for the pressing plate 41 to ensure the close fit between the pressing plate 41 and the forming groove 541, so that the pressing plate 41 can evenly and comprehensively press each main board into the forming cavity 51, thereby forming the protective main board 1 by hot pressing. The height limiting block 561 is installed on the top surface of the mother mold 54 and outside the groove of the forming groove 541. Each height limiting block 561 is symmetrically arranged on the outer periphery of the forming groove 541 and the top surface is convex to the top surface of the mother mold 54. The top surface height of each height limiting block 561 is consistent and flush. The height limiting blocks 561 are set to be two groups or four groups. When there are two groups, the two groups of height limiting blocks 561 can be symmetrically arranged on the opposite sides of the forming groove 541. When there are four groups, the four groups of height limiting blocks 561 can be symmetrically arranged on the four sides of the forming groove 541. The height limiting blocks 561 can control the thickness of the pressure plate 41. The top surface height of the height limiting blocks 561 can be adjusted to facilitate the adjustment and replacement of pressure plates 41 of different thicknesses. However, it should be ensured that when the bottom surface of the upper mold 4 is buckled and abutted against the height limiting blocks 561 on the top surface of the mother mold 54, the pressure plate 41 just hovers at the cavity mouth position of the molding cavity 51. In order to facilitate the rapid alignment of the upper mold 4 and the lower mold 5 and ensure that the position of the pressure plate 41 is not offset and is accurately aligned, at least two first positioning columns 562 are provided on the top surface of the mother mold 54 and on the outer periphery of the groove 541, protruding upward in the vertical direction, and two of the first positioning columns 562 are located on both sides of the diagonal corners. Positioning holes 46 can be adapted to be arranged on the upper mold 4 at positions corresponding to the first positioning columns 562 to ensure that the first positioning columns 562 are inserted into the positioning holes 46 when the upper mold 4 and the lower mold are interlocked.In this embodiment, grooves are provided on both sides of the female mold 54 and on two opposite sides of the forming groove 541. The grooves on the side facing the forming groove 541 can penetrate the forming groove 541. A loose piece 563 embedded in the grooves in a riveted form is screwed in the grooves, so that the protective mainboard 1 formed after molding can be pried out from the side by removing the loose piece 563 when it is difficult to demold. Due to the setting of the margin, even if the side of the protective mainboard 1 formed after molding may have defects due to the loose piece 563 or other factors, it can be removed during the subsequent cutting and finishing, thereby ensuring the quality of the protective backplane of the magnetic electronic product. The loose piece 563 can also be a temperature sensor, so as to detect the temperature of the male mold 47 and the female mold 54 at the same time.

[0066] In the content defined in this embodiment, a connecting plate 551 capable of moving vertically in the installing groove 523 is provided in the installing groove 523, a plurality of ejector pins 55 are provided and symmetrically arranged on the connecting plate 551, and each ejector pin 55 protrudes from the connecting plate 551 in the vertical direction. A plurality of first through holes are provided at positions corresponding to each ejector pin 55 on the first heat insulation board 53, and the ejector pin 55 can freely pass through the first through holes, and each ejector pin 55 is always arranged in the first through hole, and the first through hole guides the ejector pin 55. On the bottom surface of the mother mold 54, at the position corresponding to each first through hole, a second through hole is opened upward in the vertical direction, penetrating the bottom surface of the forming groove 541. When the connecting plate 551 abuts against the bottom surface of the mounting groove 523, the top end of each ejector pin 55 passes through the first through hole and is located in the second through hole. After the protective main board 1 is hot-pressed, the connecting plate 551 is moved upward to enable each ejector pin 55 to vertically pass through the first heat insulation plate 53 and penetrate into the molding cavity 51, so as to separate the protective main board 1 from the molding cavity 51, thereby assisting demolding and reducing the difficulty of demolding.

[0067] In this embodiment, the upper mold 4 includes a top plate 42, a pad 43, a second heat insulation plate 44 and a male mold 47 connected in sequence from top to bottom. The pressure plate 41 is convexly formed on the bottom surface of the male mold 47. The top plate 42 is convenient for connection with other driving devices to drive the top plate 42 to move in the vertical direction, thereby providing support for the male mold 47, etc. The pad 43 is used to increase the thickness between the top plate 42 and the second heat insulation plate 44. The second heat insulation plate 44 prevents the high temperature during hot pressing from being transmitted to the top plate 42 and other driving devices to affect the connection and use. The female mold 54 cooperates with the female mold 54 to interlock with each other, and the pressure plate 41 and the forming groove 541 are interlocked to compress the stacked main boards.

[0068] In the content defined in this embodiment, the top plate 42 and the pad 43 are both rectangular block or sheet structures, and the driving structure can drive the upper mold 4 to move by sucking the top plate 42 with bolts or using a suction cup. The material of the second heat insulation board 44 is consistent with the material of the first heat insulation board 53 and is fixedly connected to the bottom surface of the pad 43. The male mold 47 is fixedly connected to the bottom surface of the second heat insulation board 44 and the length and width are consistent with the length and width of the female mold 54, so that the male mold 47 and the female mold 54 can be more closely and evenly matched. The pressing plate 41 is integrally formed on the bottom surface of the male mold 47, the length of the pressing plate 41 is consistent with the length of the forming groove 541, and the width of the pressing plate 41 is consistent with the width of the forming groove 541, so that the pressing plate 41 can penetrate into the forming groove 541 and is used to protect the formation of the back of the main board 1. The male mold 47 and the female mold 54 are both made of high hardness and high temperature resistant materials such as cast iron alloy. The positioning hole 46 is recessed on the bottom surface of the male mold 47 corresponding to the first positioning column 562 and is located at the periphery of the pressing plate 41 without interfering with the pressing plate 41. A height limiting block 561 is also fixedly arranged on the bottom surface of the male mold 47. The height limiting block 561 on the male mold 47 is convex from the bottom surface of the male mold 47, and the thickness of the height limiting block 561 on the male mold 47 that is convex from the bottom surface of the male mold 47 is the same as the thickness of the height limiting block 561 on the female mold 54 that is convex from the top surface. The height limiting block 561 of the male mold 47 and the height limiting block 561 on the female mold 54 are staggered to further ensure the matching of the pressing plate 41 and the forming groove 541.

[0069] In this embodiment, the heating unit 6 includes a first heating part 61 arranged inside the female mold 54 and evenly distributed below the molding cavity 51, a second heating part 62 arranged inside the male mold 47 and evenly distributed above the pressing plate 41, a first water-cooling part 63 arranged inside the female mold 54 and evenly distributed below the molding cavity 51, and a second water-cooling part 64 arranged inside the male mold 47 and evenly distributed above the pressing plate 41. The first heating part 61 is used to heat the molding cavity 51, the second heating part 62 is used to heat the pressing plate 41, the first water-cooling part 63 is used to adjust the temperature of the first heating part 61 so that the molding cavity 51 can maintain a constant stability, thereby making the hot pressing molding more stable, and the second water-cooling part 64 is used to adjust the temperature of the second heating part 62 so that the temperature of the pressing plate 41 remains constant and more stable. In the content defined in this embodiment, the first heating part 61 and the second heating part 62 both include oil heating pipes. The oil heating pipe can be one and evenly distributed in a circular shape inside the female mold 54 and the male mold 47. The oil heating pipe of the female mold 54 is located directly below the molding cavity 51, and the oil heating pipe of the male mold 47 is located directly above the pressing plate 41. When in use, high-temperature hot oil is injected into the oil heating pipe through an external heating structure to heat the oil heating pipe, thereby heating the female mold 54 and the molding cavity 51 as well as the male mold 47 and the pressing plate 41. A temperature sensor can be set on the female mold 54 to detect the temperature of the female mold 54 and the male mold in real time. The first water-cooling part 63 is located on the side away from the molding cavity 51 relative to the first heating part 61, and the second water-cooling part 64 is located on the side away from the pressing plate 41 relative to the second heating part 62. The first water-cooling part 63 and the second water-cooling part 64 both include water-cooling pipes, and the arrangement of the water-cooling pipes is the same as that of the oil-heating pipes. The first water-cooling part 63 and the second water-cooling part 64 are used to adjust the hot pressing temperature. When the temperature is too high, the temperature of the male mold 47 and the female mold 54 is reduced by water cooling until the temperature is at a suitable temperature. The first water-cooling part 63 and the second water-cooling part 64 are both located on the side away from the molding cavity 51 to avoid the temperature in the molding cavity 51 from cooling down too quickly during cooling, which affects the hot pressing effect. At the same time, the first water-cooling part 63 and the second water-cooling part 64 can respectively reduce the temperature of the female mold 54 on the side close to the first heat insulation plate 53 and the temperature of the male mold 47 on the side close to the second heat insulation plate 44, thereby improving the heat insulation effect.

[0070] It should be noted that all structures of the hot pressing mold are made of high temperature resistant materials to ensure the hot pressing work.

[0071] When in use, one of the working principles of the hot pressing mold is as follows: first, the first main board 151, the third main board 153, the fourth main board 154 and the second main board 152 are stacked in sequence, and the first heating unit 61 and the second heating unit 62 heat the molding cavity 51 and the pressing plate 41 respectively, and then the second main board 152 faces the bottom side of the molding cavity 51 to put the stacked main boards into the molding cavity 51, and the external driving device drives the upper mold 4 to move, and after the first positioning column 562 is aligned with the positioning hole 46, the pressing plate 41 gradually approaches each main board, Afterwards, the pressing plate 41 gradually presses each main board, thereby heating and squeezing each main board, until the male mold 47 and the female mold 54 abut against the height limit block 561, which is sufficient to extrude and deform each main board and fill the molding cavity 51 until it is formed. After hot pressing for a certain period of time, such as 700 seconds, each protective main board 1 is formed. After it cools down, the protective main board 1 is expelled with the assistance of the ejector pin 55. After that, the magnetic part 2 and the cover plate 3 are installed in the assembly groove 11 in turn, and the remaining part is finely processed until the formation and assembly of the magnetic electronic product protective backplane is completed.

[0072] like Figure 11 to Figure 12 As shown, the first clamping fixture 7 of the present invention includes a second base 71 with a horizontal surface on the top surface, and a convex block 72 is convex on the top surface of the second base 71 corresponding to the concave portion formed by the ribs 13 on the processing surface 12 of the protective main board 1. The shape and size of each convex block 72 correspond to the shape, size and position of the concave portion formed by the ribs 13 on the processing surface 12, so that the gap between each convex block 72 forms a space consistent with each rib 13, so that each rib 13 on the processing surface 12 of the protective main board 1 can be partially attached to the top surface of the second base 71, and each convex block 72 penetrates and fits each concave portion of the processing surface 12, and the corresponding assembly groove 11 portion can be directly avoided to form a vacancy. In this way, each convex block 72 and the corresponding part of the top surface of the second base 71 together form a first working surface 7a for supporting the protective main board 1 and matching the processing surface 12. The second base 71 includes an upper half and a lower half that are sealed and buckled with each other. An air cavity 73 is formed in the upper half at a position corresponding to the first working surface 7a. The air cavity 73 forms a sealed space after the upper half and the lower half are buckled together. The air cavity 73 is connected to an external air pump. Air holes 74 are provided on the top surface of the air cavity 73 at positions corresponding to the protrusions 72 in the vertical direction. Each air hole 74 is connected to the air cavity 73. When the processing surface 12 of the protective main board 1 is attached to the first working surface 7a, air can be sucked through the rear air cavity 73 to form a negative pressure to suck the protective main board 1, thereby fixing the protective main board 1.

[0073] like Fig.16As shown, the second clamping fixture 8 of the present invention includes a third base 81 in a rectangular plate-like structure, and the third base 81 is made of a metal alloy that is resistant to high temperatures and has high hardness, such as cast iron. A second working surface 82 for supporting the protective mainboard 1 is formed on the top surface of the second base 71. The length and width of the second working surface 82 are respectively greater than the length and width of the protective mainboard 1, that is, the length of the second working surface 82 is greater than the length of the protective mainboard 1, and the width of the second working surface 82 is greater than the width of the protective mainboard 1. A working area adapted to the processing surface 12 is formed on the second working surface 82, that is, the length and width of the working area are respectively the same as the length and width of the protective mainboard 1. A first positioning structure 83 for limiting the movement of the protective mainboard 1 in the horizontal direction is provided on the second working surface 82 and outside each side edge of the working area. The first positioning structure 83 includes a second positioning column 831 and a limit block 832. The second positioning columns 831 are provided in a plurality and are arranged at intervals corresponding to the outer contour shape of the protective mainboard 1. Each second positioning column 831 is formed by protruding upward from the second working surface 82 to enclose the working area on the second working surface 82 corresponding to the outer contour shape of the protective mainboard 1, so that when the protective mainboard 1 needs to be fixed, the protective mainboard 1 is placed in the working area, and each second positioning column 831 is used to block the protective mainboard 1 in the horizontal direction to prevent the protective mainboard 1 from moving horizontally. The second positioning columns 831 can be provided correspondingly from the four sides of the protective mainboard 1. The limit block 832 can be arranged only on two sides thereof and also arranged on the second working surface 82 corresponding to the outer contour shape of the protective mainboard 1. The limit block 832 and the second positioning column 831 are also arranged around the edge of the working area. While limiting the lateral movement of the protective mainboard 1, they can also play a guiding reference role, so that when installing the protective mainboard 1, the protective mainboard 1 can be quickly aligned according to the direction of the limit block 832, thereby accelerating the installation efficiency of the protective mainboard 1. Preferably, since the protective mainboard 1 is attached to the working area after being installed in the working area, in order to facilitate the removal of the protective mainboard 1, a relief groove 84 extending into the working area is recessed on the outer side of the third base 81. The relief groove 84 penetrates the third base 81 in the vertical direction, and the relief groove 84 penetrates toward the side away from the working area in the horizontal direction, so that when the protective mainboard 1 needs to be removed, the protective mainboard 1 is lifted upward from the bottom surface or side of the third base 81 through the relief groove 84, thereby removing the protective mainboard 1. The number of avoidance grooves 84 is not limited to two. The two avoidance grooves 84 are respectively arranged on two opposite sides of the third base 81 .

[0074] like Figures 13 to 17As shown, the hot pressing device 9 of the present invention includes a first frame 91, a supporting portion 92 arranged on the first frame 91, a holding portion 93 arranged on the first frame 91 and located above the supporting portion 92, a third heating portion 94 arranged on the bottom of the holding portion 93 and adapted to the assembly groove 11 and the secondary groove 112, and an alarm 95 arranged on the first frame 91, a second positioning structure 921 for positioning the second clamping fixture 8 is provided on the supporting portion 92, so that the supporting portion 92 is used to support the second clamping fixture 8, the second positioning structure 921 limits the movement of the second clamping fixture 8, the holding portion 93 is used to press the magnetic attraction portion 2 and the cover plate 3 on the second clamping fixture 8, the third heating portion 94 is used to heat the holding portion 93 when the holding portion 93 presses the magnetic attraction portion 2 or the cover plate 3, and the alarm 95 emits an alarm sound when other devices fail.

[0075] In the content defined in this embodiment, universal wheels 911 are provided at the four corners of the bottom of the first frame 91 for easy movement. A horizontal work surface is provided on the top of the first frame 91, and the support portion 92 and the holding portion 93 are both provided on the work surface. A U-shaped enclosure 912 is provided on the work surface to surround the outside of the support portion 92 and the holding portion 93 to achieve a certain protective effect.

[0076] In the content defined in this embodiment, the support part 92 includes an elastic support part 922 arranged on the first frame 91, a fixed support part 923 arranged on the first frame 91 and arranged on both sides of the elastic support part 92, and a sliding part 924 arranged between the two fixed support parts 923. The elastic support part 922 is used to support the second clamping fixture 8 and locate the position of the second clamping fixture 8 to ensure that the holding part 93 can accurately hot-press the magnetic attraction part 2 or the cover plate 3 to ensure the fixation of the magnetic attraction part 2 or the cover plate 3. The fixed support part 92 provides support for the holding part 93 to ensure that the holding part 93 can press the magnetic attraction part 2 or the cover plate 3. The sliding part 924 facilitates the movement of the position of the elastic support part 92 to facilitate the installation and disassembly of the second clamping fixture 8, thereby simplifying the operation.

[0077] In the content defined in this embodiment, the elastic support part 922 includes two first fixed blocks 9221, a support plate 9222 located above the two first fixed blocks 9221, and a spring 9223 arranged between the support plate 9222 and the two first fixed blocks 9221. The two first fixed blocks 9221 are symmetrically arranged and have the same size. The springs 9223 are arranged in two groups. The two groups of springs 9223 are symmetrically arranged on the two first fixed blocks 9221. Each group of springs 9223 is set to at least two, and the two groups of springs 9223 can be distributed in a rectangular array. Both ends of each spring 9223 are fixedly connected to the first fixed block 9221 and the support plate 9222, respectively. The elastic coefficient and other properties of each spring 9223 support and keep the top surface of the support plate 9222 level. The length of the support plate 9222 is smaller than the length of the protective main board 1. The top surface of the support plate 9222 is provided with a first support surface 9224 for supporting the second clamping fixture 8, so that after the protective main board 1 is installed on the first support surface 9224 and the center is aligned with the center of the first support surface 9224, the two sides of the protective main board 1 extend symmetrically to the outside of the support plate 9222. Guide columns 9225 are provided on the top surfaces of the two first fixing blocks 9221 in a vertically upwardly protruding manner, and guide holes 9226 are provided in a vertical direction at positions corresponding to the guide columns 9225 on the support plate 9222. The top of the guide column 9225 is always penetrated in the guide hole 9226 in a vertical direction to prevent the support plate 9222 from being squeezed or other reasons from causing the support plate 9222 to shake in the horizontal direction relative to the first fixing block 9221. The second positioning structure 921 is disposed on the first support surface 9224, and includes at least two third positioning columns 9211, and two of the third positioning columns 9211 are diagonally disposed at the diagonals of the first support surface 9224. Third positioning holes 8546 are provided on the second clamping fixture 8 at positions corresponding to the third positioning columns 9211 for the third positioning columns 9211 to pass through in the vertical direction, so as to ensure accurate installation and positioning of the second clamping fixture 8.

[0078] In the content defined in this embodiment, the two fixed support parts 923 are arranged outside the two sides of the two first fixed blocks 9221 along the width direction or the length direction and are symmetrically distributed. Both fixed support parts 923 include a fourth base 9231, a third heat insulation board 9232 arranged on the top surface of the fourth base 9231, a first connecting plate 9233 arranged on the top surface of the third heat insulation board 9232, and a support block 9234 arranged on the top of the first connecting plate 9233. The fourth base 9231 is fixedly connected to the working table of the first frame 91, the third heat insulation board 9232 is used to block heat transfer to a certain extent, and the first connecting plate 9233 provides support for the support block 9234. In this embodiment, the second clamping fixture 8 is vertically opposite to each assembly groove 11. The first through-holes 96 are all through-opened, and each first through-hole 96 is located on the part of the protective main board 1 extending outside the first support surface 9224 when installed on the support plate 9222. The support blocks 9234 for movably penetrating into the first through-holes 96 are convexly formed at the positions corresponding to the first through-holes 96 on the fixed support portion 923. The horizontal cross-sectional shapes of the support blocks 9234 and the first through-holes 96 are similar to the shapes of the corresponding assembly grooves 11. Therefore, the top surface of each support block 9234 has a second support surface 9235 that is adapted to the shape of the assembly grooves 11 for supporting the protective main board 1. When the protective main board 1 is installed on the first support surface 9224, each support block 9234 passes through each first through-hole 96 to contact the back side of the protective main board 1.

[0079] In the interior defined in this embodiment, the sliding part 924 includes two parallel and spaced slide rails 9241, two sliders 9242 respectively slidably arranged on the vertical rods of the two slide rails 9241, and a first driving member 9243 arranged between the two slide rails 9241, and two first fixed blocks 9221 are respectively fixedly connected to the tops of the two sliders 9242, so that the support plate 9222 can slide along the length direction of the slide rails 9241. The first driving member 9243 can be an electric push rod or a cylinder, and the output shaft of the first driving member 9243 is arranged parallel to the slide rail 9241 and a connecting strip 9244 is fixedly connected to the output shaft, and the two ends of the connecting strip 9244 are respectively fixedly connected to the two first fixed blocks 9221, so that after the first driving member 9243 is started, the elastic support part 92 is driven to slide back and forth along the length direction of the slide rail 9241 through the expansion and contraction of the output shaft, so that the support plate 9222 of the elastic support part 92 slides to the right below the holding part 93 and slides to one side of the holding part 93. Preferably, the length direction of the slide rail 9241 is perpendicular to the arrangement direction of the two fixed support parts 923 so that the slide rail 9241 and the fourth base 9231 do not interfere with each other.

[0080] In the content defined in this embodiment, the holding part 93 includes a bracket 931 connected to the work surface of the first frame 91 and mounted on the elastic support part 922 and the fixed support part 923, a second driving member 932 arranged on the frame, a second connecting plate 933 connected to the output shaft of the second driving member 932 and arranged facing the support plate 9222, and a fourth heat insulation plate 934 connected to the bottom surface of the second connecting plate 933. The bracket 931 provides support for the second driving member 932, and the second driving member 932 is used to drive the second connecting plate 933, the fourth heat insulation plate 934 and the third heating part 94 to move in the vertical direction, so as to approach or move away from the support plate 9222. The second connecting plate 933 provides connection support for the heating plate 941, and the fourth heat insulation plate 934 blocks heat transfer to a certain extent, thereby ensuring the service life of the output shaft of the second driving member 932. The third heating unit 94 includes a heating plate 941 disposed at the bottom of the fourth heat insulating plate 934 and a thermocouple 942 penetrating the heating plate 941 , so as to heat the heating plate 941 when started.

[0081] In this embodiment, the bracket 931 includes four support rods extending in the vertical direction and a panel. The four support rods are arranged in a rectangular array and the bottom ends are connected to the work surface. The top ends of the four support rods are fixedly connected to the four corners of the panel. A control box 9311 with a controller installed is provided on the panel. The control box 9311 is provided with a temperature / time control switch electrically connected to the controller. The thermocouple 942, the first drive member 9243, and the second drive member 932 are all electrically connected to the controller. The temperature / time control switch is used to adjust the heating temperature and time of the thermocouple 942. The controller is used to control the start of the first drive member 9243 and the second drive member 932 when necessary. It can be started manually or automatically controlled by setting an induction sensor. The second driving member 932 is a linear cylinder whose output shaft is telescopic in a straight line. The second driving member 932 is fixedly mounted on the panel. A second through hole is formed on the panel for the output shaft of the second driving member 932 to freely pass through in the vertical direction. The output shaft of the second driving member 932 passes through the second through hole to telescope downward and pass out from under the second through hole. In this embodiment, the second driving member 932 is coaxial with the midpoint of the support plate 9222. The second connecting plate 933 and the fourth heat insulation plate 934 are both rectangular or square plate structures. The center position of the top surface of the second connecting plate 933 is fixedly connected to the output shaft of the second driving member 932, and the fourth heat insulation plate 934 is fixedly connected to the bottom surface of the second connecting plate 933 and is arranged in an overlapping manner with the second connecting plate 933 in size. Sliding rods are fixedly connected in the vertical direction at the four corners of the top surface of the second connecting plate 933. Linear bearings or linear guides are fixedly arranged on the panel at the positions corresponding to the four sliding rods. The four sliding rods are respectively slidably inserted into the four linear bearings and pass through the second connecting plate 933 to increase the movement stability of the second connecting plate 933.

[0082] In this embodiment, two heating plates 941 are provided and arranged in the vertical direction at the position where the fourth heat insulation plate 934 is directly opposite to the two first connection blocks. A plurality of thermocouples 942 are inserted in the heating plates 941 to ensure that the heating plates 941 can be heated. On the bottom surfaces of the two heating plates 941, at the positions corresponding to the positions of the device slots, there are respectively formed downwardly protruding holding blocks 943 for respectively holding the magnetic suction parts 2. The bottom heights of the holding blocks 943 are all located at the same horizontal plane so that the holding blocks 943 are arranged flush with the support blocks 9234 and correspond to each other. Since there are multiple magnetic suction parts 2 in each assembly slot 11, in order to ensure that each magnetic suction part 2 is pressed tightly, the bottom of each holding block 943 is provided with a holding foot 9431 extending downwardly at the position corresponding to each magnetic suction part 2, that is, one magnetic suction part 2 corresponds to one holding foot 943. 1. Each pressing foot 9431 is independent and spaced from each other, and the cross section of each pressing foot 9431 falls within each edge line of the magnetic attraction part 2 when pressing on the magnetic attraction part 2, so as to ensure that each pressing foot 9431 only presses the magnetic attraction part 2, and the bottom surface of each pressing foot 9431 is defined as the pressing surface. Each pressing foot 9431 on each pressing block 943 corresponds to a support block 9234, so that the support block 9234 and the pressing surface cooperate to press the magnetic attraction part 2, reduce or even avoid the impact on other parts of the protective mainboard 1, and ensure the hot pressing accuracy and equipment accuracy of the magnetic attraction part 2. The heating plate 941 and the pressing block 943 are made of materials that are resistant to high temperatures and have good thermal conductivity, such as metal alloy materials tungsten, or non-metallic materials such as graphite. In order to ensure the curing speed of the glue at the magnetic attraction part 2 by hot pressing, a thermocouple 942 can be set on the first connecting plate 9233. Therefore, the first connecting plate 9233 and the support block 9234 are also made of high temperature resistant and high thermal conductivity materials, and the support block 9234 does not contact the inner wall of the first perforation 96 when passing through the first perforation 96, so that the setting of the first perforation 96 can also prevent the effect of heat conduction to a certain extent, thereby improving the service life of the second clamping fixture 8.

[0083] It should be noted that the same hot pressing device 9 can be used for hot pressing of the cover plate 3. By adjusting the hot pressing temperature and time, the same hot pressing effect can be achieved to complete the installation of the cover plate 3. In another embodiment, another hot pressing device 9 is used for hot pressing the cover plate 3. The hot pressing device 9 is different from the structure of the aforementioned hot pressing device 9 only in the structure of the holding block 943. The rest of the structures are the same and will not be described here. The holding block 943 of the hot pressing device 9 corresponding to the cover plate 3 is adapted to the shape of the support block 9234 without the holding foot 9431.

[0084] like Figure 1 As shown, the manufacturing method of the magnetic protective back plate of the present invention comprises the following steps:

[0085] S1. Material preparation: Based on the magnetic protective backplane, the protective main board 1, the magnetic part 2 and the cover plate 3 are designed in size, selected in materials and cut into shape according to the requirements;

[0086] S2, forming the protective mainboard 1: stacking the two-layer mainboard 15a and at least one intermediate mainboard 15b sandwiched between the two-layer mainboard 15a, which are designed and formed in step S1, in sequence, and placing them in a hot pressing mold for hot pressing to form an integrated protective mainboard, cooling the hot-pressed protective mainboard, and taking it out from the hot pressing mold after the temperature drops;

[0087] S3, mechanical processing: the protective mainboard 1 formed by hot pressing in step S2 is positioned by a first clamping fixture 7, and the protective mainboard 1 on the first clamping fixture 7 is mechanically processed by a lathe;

[0088] S4, installation and fixation of the magnetic attraction part 2: transfer the protective main board 1 processed in step S3 to a second clamping fixture 8 and position the protective main board 1, dispense glue into a plurality of assembly grooves 11 formed after hot pressing on the protective main board 1, place each magnetic attraction part 2 in the corresponding assembly groove 11, and use a hot pressing device 9 to hot press the magnetic attraction part 2 on the second clamping fixture 8 to solidify the glue;

[0089] S5. Installation and fixation of the cover plate 3: Continue to apply glue to each magnetic attraction portion 2 of the protective main board 1 in step S4, and place the cover plates 3 in the corresponding assembly grooves 11 respectively, and use the hot pressing device 9 to hot press the cover plates 3 on the second clamping fixture 8 to solidify the glue.

[0090] In step S1, the length × width × height of the magnetic protective back panel of one embodiment finally determined is 127.73 × 244.41 × 2.22 mm, of which the thickness is 2.22 mm. In order to ensure the later cutting process, a 1.5 mm margin is provided on each side. Correspondingly, the first main board 151 and the third main board 153 are made of the same material and have a size of 130.73 × 247.41 × 0.1 mm, the size of the fourth main board 154 is 130.73 × 247.41 × 1 mm, and the size of the second main board 152 is 130.73 × 247.41 × 2 mm. After the size design is completed, the first main board 151 and the third main board 153 are made of the same material: semi-cured sheet, the specification is PP-2116 epoxy fast-curing resin; the second main board 152 and the fourth main board 154 are made of sheet molding material, the specification is Chopped-12.5 mm epoxy fast-curing resin. Use an external CNC vibration knife cutting machine to cut into corresponding sizes to complete the material preparation of the protective motherboard 1. The magnetic attraction parts 2 are all magnets, which are cut to corresponding sizes according to requirements; the cover plate 3 is selected and designed according to the size of each assembly groove 11. After the cover plate 3 is installed in the assembly groove 11, there must be a certain gap between its side and the inner wall of the groove of the assembly groove 11 to facilitate the installation of the cover plate 3 and the coverage of glue. According to the above requirements, the design and cutting of each cover plate 3 are completed.

[0091] In step S2, the cut two-layer main board 15a and the middle layer main board 15b are stacked in sequence, and the first main board 151, the third main board 153, the fourth main board 154 and the second main board 152 are arranged and stacked in the molding cavity 51 in sequence from top to bottom, and each contour opening 155 corresponds to the molded structure on the bottom surface of the molding cavity 51 one by one to ensure the formation of the assembly groove 11 and the step surface 111. Subsequently, the first positioning column 562 is aligned with the first positioning hole 46 and the upper mold 4 is moved in the vertical direction toward one side of the molding cavity 51, so that the pressing plate 41 extends into the molding cavity 51 and presses the surface layer main board 15a and the middle layer main board 15b in the molding cavity 51, and the heating unit 6 is started to start the first heating part 61 and the second heating part 62 to heat the molding cavity 51 and the pressing plate 41 until each main board is hot-pressed and formed until the protective main board 1 is formed into a whole. During this process, the first water-cooling part 63 and the second water-cooling part 64 control the temperature in the molding cavity 51 through heat exchange to prevent overheating from affecting the service life and the hot pressing effect, and at the same time adjust the hot pressing temperature to ensure a certain degree of constant temperature during hot pressing.

[0092] In step S3, after the protective main board 1 is installed on the first working surface 7a, and each assembly groove 11 on the processing surface 12 is aligned with each protrusion 72 and fits each other, the protective main board 1 is positioned by vacuum adsorption by starting an external vacuum pump to form a negative pressure in the air cavity 73, and then the adsorption state is maintained, and the remaining part of the protective main board 1 is cut and processed, and the corresponding avoidance structure on the protective main board 1 is cut at the same time, the remaining part is cut off, and each corner is rounded. Compared with not setting a remaining part, the design of the molding cavity 51 and the remaining part of the present invention can make the protective main board 1 reach the required size as much as possible by calculating and cutting off the remaining part when the edge of the protective main board 1 has errors or burrs and other non-standard conditions after hot pressing, so as to avoid waste caused by errors after hot pressing.

[0093] In step S4, first, the cut protective main board 1 is transferred to the second clamping fixture 8, and the processing surface 12 of the protective main board 1 is facing and fitted to the working area. Each second positioning column 831 and the limit block 832 correspondingly limit the movement of the protective main board 1 in the horizontal direction of each of the first positioning structures 83. Then, the second clamping fixture 8 is transferred to the glue dispenser, and glue is applied to each groove 112. After the glue is dispensed, each magnetic part 2 is placed in each secondary groove 112 manually or mechanically in turn, so that each magnetic part 2 is placed on the glue in each secondary groove 112 and ensures that the magnetic part 2 is fitted with the secondary groove 112. Among them, the glue dispensing head is 0.5mm, the glue dispensing thickness is 0.1±0.07mm, the glue dispensing speed is 8*3mm / h, the glue dosage is 0.5g, the glue dispensing cycle is 76s, and the glue opening time is 120~240s.

[0094] In step S4, after the magnetic attraction part 2 is installed, the second driving member 932 is operated to drive the elastic support part 922 to slide out from under the holding part 93, and the second clamping fixture 8 is matched with the second positioning structure 921 to be installed on the first supporting surface 9224 of the elastic support part 922, and the elastic support part 922 elastically supports it. The second driving member 932 is operated again to reset the elastic support part 922 to move to the position directly below the holding part 93; then, the third heating part 94 is started and the temperature of the heating plate 941 and the holding block 943 reaches 100°C, and the pressure is between 0.4 and 0. 5Mpa, then the pressing part 93, driven by the second driving member 932, moves the third heating part 94 along the vertical direction toward each magnetic attraction part 2 until the pressing surface of each pressing foot 9431 is pressed on each magnetic attraction part 2, until the back side of the protective main board 1 on the supporting plate 9222 abuts against the second supporting surface 9235, then the timing starts and the pressure is maintained at 100℃ for 180s to allow the glue to gradually solidify. After the hot pressing time is completed, the third heating part 94 is turned off and the second driving member 932 drives the pressing part 93 to return to its original position; thereafter, the first driving member 9243 drives the supporting part 92 to move to the outside below the pressing part 93. In this step, before the holding portion 93 squeezes the protective main board 1, the top surface height of the support block 9234 is lower than the bottom surface height of the second clamping fixture 8 under the support of the spring 9223 of the second clamping fixture 8. At this time, the support block 9234 is not in the first through hole 96, so that the elastic support portion 922 can move laterally (i.e. horizontally, specifically in the length direction of the slide rail 9241) driven by the sliding portion 924, and when the holding portion 93 drives the third heating portion 94 to heat the magnetic suction portion 2, the spring 9223 moves the support portion 92 downward and the support block 9234 penetrates into the first through hole 96, thereby avoiding obstruction. It should be noted that in step S4, when the hot pressing device 9 fails, the alarm 95 sounds an alarm, and the alarm 95 is a buzzer.

[0095] In step S5, after the hot-pressed magnetic suction part 2 cools down, the second clamping fixture 8 is removed and transferred to the glue dispensing machine, and glue is applied to each magnetic suction part 2, wherein the glue dispensing head is 0.5mm, the glue dispensing thickness is 0.1±0.07mm, the glue dispensing speed is 8*3mm / h, the glue dosage is 0.5g, the glue dispensing cycle is 76s, and the glue opening time is 120s. Subsequently, each cover plate 3 is respectively fitted into the corresponding assembly groove 11 by manual or automatic machinery. After the installation of the cover plate 3 is completed, the second clamping fixture 8 is transferred to the support plate 9222 of the hot pressing device 9, and the cover plate 3 is hot-pressed for a certain period of time in the same steps and manner as the hot pressing step of the magnetic suction part 2, and then reset, and then the second clamping fixture 8 is removed, and the magnetic suction protective back plate is taken out. Finally, the molded product is quality inspected.

[0096] Compared with the prior art, the manufacturing method of the magnetic protective back plate of the present invention divides the magnetic protective back plate into a protective main board 1, a magnetic part 2 and a cover plate 3, and hot presses them separately to avoid the hidden dangers and defects of hot pressing together, so as to improve the quality of the magnetic protective back plate after molding.

Claims

1. A method for manufacturing a magnetic protective back plate, characterized in that: The following steps are involved: S1. Material preparation: Based on the protective main board, magnetic part and cover plate of the magnetic protective back plate, the size design, material selection and cutting and forming are carried out according to the requirements; S2, forming the protective mainboard: stacking the two surface mainboards and at least one intermediate mainboard sandwiched between the two surface mainboards, which are included in the protective mainboard designed and formed in step S1, in sequence, and placing them in a hot pressing mold for hot pressing to form an integrated protective mainboard, cooling the hot-pressed protective mainboard, and taking it out from the hot pressing mold after the temperature drops; S3, mechanical processing: positioning the protective mainboard formed by hot pressing in step S2 through a first clamping fixture, and mechanically processing the protective mainboard on the first clamping fixture using a lathe; S4, installation and fixation of the magnetic attraction part: transfer the protective mainboard processed in step S3 to a second clamping fixture and position the protective mainboard, dispense glue into a plurality of assembly grooves formed after hot pressing on the protective mainboard, place each magnetic attraction part in the corresponding assembly groove, and use a hot pressing device to hot press the magnetic attraction part on the second clamping fixture to solidify the glue; S5. Installation and fixation of the cover plate: continue to apply glue to each of the magnetic suction parts of the protective mainboard in step S4, and place the cover plates in the corresponding assembly grooves respectively, and use a hot pressing device to hot press the cover plates on the second clamping fixture to solidify the glue.

2. The method for manufacturing a magnetic protective back plate according to claim 1, characterized in that: In the step S1, the draft angle of the outer sides of the two stacked surface layer main boards and the middle layer main board is 4-6 degrees, and a 1.5 mm margin is added to each side of each surface layer main board and the middle layer main board.

3. The method for manufacturing a magnetic protective back plate according to claim 1, characterized in that: The hot pressing mold comprises an upper mold and a lower mold that can be buckled with each other, the top of the lower mold is concavely provided with a molding cavity consistent with the shape contour of the protective mainboard, the bottom of the upper mold is convexly provided with a pressing plate for blocking one side of the molding cavity opening, and a heating unit for heating the molding cavity and the pressing plate is provided between the upper mold and the lower mold; In step S2, the two stacked surface main boards and the middle layer main board are placed in the molding cavity, the pressing plate is extended into the molding cavity and presses the surface main board and the middle layer main board in the molding cavity, and the heating unit is started and heats the molding cavity until the protective main board is formed.

4. The method for manufacturing a magnetic protective back plate according to claim 3, characterized in that: The heating unit comprises a first heating part and a first water cooling part arranged on the lower mold, and a second heating part and a second water cooling part arranged on the upper mold; In step S2, the first heating part and the second heating part are started to heat the molding cavity, and the first water cooling part and the second water cooling part control the temperature in the molding cavity through heat exchange.

5. The method for manufacturing a magnetic protective back plate according to claim 2, wherein: A side surface of the protective mainboard having the installation groove is defined as a processing surface, and the first clamping fixture has a first working surface for supporting the protective mainboard and matching the processing surface; In step S3, the first clamping fixture positions the protective mainboard by vacuum adsorption, and then the protective mainboard is cut, the excess part is cut off, and each corner is rounded.

6. The method for manufacturing a magnetic protective back plate according to claim 1, characterized in that: The second clamping fixture has a second working surface for supporting the protective mainboard, a working area adapted to the processing surface is formed on the second working surface, a first positioning structure for limiting the movement of the protective mainboard in the horizontal direction is provided on the second working surface and outside each side edge of the working area, and an avoidance groove extending into the working area is recessed on the outer side edge of the second clamping fixture; In step S4, one side of the processing surface of the protective main board is facing and attached to the working area, and each of the first positioning structures limits the movement of the protective main board in the horizontal direction.

7. The method for manufacturing a magnetic protective back plate according to claim 6, characterized in that: A plurality of independent secondary grooves are recessed in each of the assembly grooves, and the magnetic attraction parts are arranged in each of the secondary grooves corresponding to the secondary grooves; the hot pressing device comprises a first frame, a support part arranged on the first frame, a holding part arranged on the first frame and located above the support part, and a third heating part arranged on the bottom of the holding part and adapted to the assembly groove and the secondary groove, and a second positioning structure for positioning the second clamping fixture is provided on the support part; In step S4, after the magnetic attraction part is installed, the second clamping fixture is cooperated with the second positioning structure to be installed on the supporting part, and the pressing part drives the started third heating part to move toward each magnetic attraction part in the vertical direction until it is pressed on each magnetic attraction part and heats each magnetic attraction part for a certain period of time, and then the third heating part is turned off and the pressing part is reset.

8. The method for manufacturing a magnetic protective back plate according to claim 7, characterized in that: The second clamping fixture is provided with a first through hole at a position vertically opposite to each device slot, and the support portion includes an elastic support portion arranged on the first frame and a fixed support portion arranged on the first frame and arranged on both sides of the elastic support portion, the top surface of the elastic support portion has a first support surface for supporting the second clamping fixture, the second positioning structure is arranged on the first support surface, and the fixed support portion is convexly formed with a support block for movably penetrating into the first through hole at a position corresponding to the first through hole, the top surface of each support block has a second support surface adapted to the shape of each assembly groove for supporting the protective mainboard, and the pressing portion is convexly formed with pressing surfaces for respectively pressing each magnetic suction portion on the upper and lower sides; In step S4, after the second clamping fixture is installed on the first supporting surface, the elastic supporting part elastically supports it, and the pressing part drives the third heating part to press down the second clamping fixture until the protective mainboard abuts against the second supporting surface, and each of the second supporting surfaces is opposite to each assembly groove.

9. The method for manufacturing a magnetic protective back plate according to claim 8, characterized in that: The support portion further comprises a sliding portion disposed between the two fixed support portions, and the elastic support portion is connected to the sliding portion; In step S4, the sliding part is used to drive the elastic supporting part to move in the horizontal direction when installing or removing the second clamping fixture.

10. The method for manufacturing a magnetic protective back plate according to claim 7, characterized in that: The hot pressing device further comprises an alarm device arranged on the first frame. In step S4, when the hot pressing device fails, the alarm device emits an alarm sound.

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