A folding forming process of a transfer box and the transfer box

Abstract

The present application relates to the technical field of transfer box manufacturing, and provides a transfer box bending forming process and a transfer box, which comprises the following steps: S100, cutting a composite sandwich panel into a plurality of unit panels, the unit panels comprising one end face unit panel and four side wall unit panels; S200, laying the four side wall unit panels around the end face unit panel, and sequentially laying a hot melt adhesive layer and a wear-resistant fabric layer on the end face unit panel and the four side wall unit panels, and hot curing to form a panel blank; S300, folding the panel blank along the gap between the edges of the side wall unit panels and the end face unit panel to form a box cover preliminary blank or a box bottom preliminary blank with an open top; and S400, bonding an angle material at the corners of the box cover preliminary blank or the box bottom preliminary blank to form a finished product box cover or a finished product box bottom. The box cover and / or the box bottom are assembled with a box body to form the transfer box, and the technical problem of high mold opening cost in the prior art for manufacturing a lightweight transfer box is solved.

Description

Technical Field

[0001] This invention relates to the field of transfer box manufacturing technology, specifically to a transfer box bending forming process and a transfer box. Background Technology

[0002] Transport crates are widely used in long-distance transport and air freight of products such as LED display modules, precision testing instruments, and industrial electronic equipment. They require high levels of impact resistance, reliability, and environmental tolerance. Currently, most mainstream transport crates use an "aluminum alloy frame + wooden plywood" structure, with metal corner protectors and rivets for reinforcement, and internal cushioning material. While this structure provides basic protection, it has significant drawbacks in practical applications: First, it has poor environmental resistance; the wooden plywood and metal connectors are prone to mold and corrosion in humid, salt spray, and high-temperature / high-humidity environments, and corrosion gradually reduces the structural strength, resulting in a lifespan of less than one year. Second, it is relatively heavy; the solid wood base and numerous metal connectors contribute to the high weight of the crate, which, coupled with the fact that freight transport is often charged by weight, leads to higher logistics costs. Third, it has low assembly efficiency; assembling the crate requires numerous rivets and sealant application, a cumbersome process with high labor costs, and the sealing quality is greatly affected by manual operation, resulting in poor consistency.

[0003] To achieve lightweight cases, carbon fiber composite materials are being used in the manufacture of transport cases. Currently, carbon fiber cases are mainly manufactured using hand lay-up molding or resin transfer molding (RTM) processes. For example, Chinese invention patent CN104626608B discloses a lightweight carbon fiber carrying case integral molding process, which uses a method of molding the case body and lid by combining multiple separate molds and then channeling resin. While this makes the case lighter overall, this type of process still has limitations. For instance, the resin channeling process requires auxiliary components such as a channeling mesh, resin inlet pipes, and air extraction pipes, making the process complex. It also presents challenges in controlling the uniformity and content of resin impregnation, and can easily lead to problems such as high porosity and uneven mechanical properties. Summary of the Invention

[0004] To overcome the above-mentioned defects, embodiments of the present invention provide a bending forming process for a transfer box and a transfer box, which solves the technical problem of high mold opening cost in the production of lightweight transfer boxes in the prior art.

[0005] According to one aspect, at least one embodiment of the present invention provides a bending and forming process for a transfer box, used to manufacture accessories for the transfer box, said accessories being one of a box lid, box bottom, or box body, comprising: S100, which manufactures composite sandwich panels into several unit panels; S200, the unit plate is laid face down on a plane according to the unfolded material shape of the accessory, and there is a gap between two adjacent unit plates. A hot melt adhesive layer and a wear-resistant fabric layer are sequentially applied to the back of the unit plate to form an assembly. The assembly is thermo-cured to form a blank. S300, fold the blank along the gap between adjacent unit plates to form the initial blank of the accessory; S400, corner pieces are bonded to the corners of the component blank, so that the corner pieces are connected to the adjacent unit plates to form finished components.

[0006] For example, in a bending and forming process for a transfer box provided in at least one embodiment of the present invention, when the accessory is either a box lid or a box bottom, The composite sandwich panel described in S100 is made into one end face unit panel and four side wall unit panels; In S200, with the end face unit plate as the center, four side unit plates are circumferentially spaced around the end face unit plate.

[0007] For example, in a transfer box bending forming process provided by at least one embodiment of the present invention, the edges of the side panel unit plate adjacent to other side panel unit plates and the edges of the side panel unit plate adjacent to the end panel unit plate are all recessed steps, and the four sides of the end panel unit plate are all recessed steps. The two sides of the angle piece are respectively used to bond to the recessed steps of two adjacent side panel unit plates or the side panel unit plate and the end panel unit plate, so that the assembly maintains the shape of the finished part.

[0008] For example, in a transfer box bending and forming process provided by at least one embodiment of the present invention, when the accessory is a box body, The composite sandwich panel described in S100 is made into at least four side panel units; In S200, several of the side panel units are laid out in a linear array.

[0009] For example, in a transfer box bending forming process provided by at least one embodiment of the present invention, the edge of the side panel unit adjacent to other side panel unit plates has a recessed step, and the two sides of the angle piece are respectively used to bond to the recessed steps of two adjacent side panel unit plates so that the assembly maintains the shape of the finished part.

[0010] For example, in a transfer box bending and forming process provided by at least one embodiment of the present invention, in step S200, the step of thermosetting the assemblies to form a blank specifically includes: S221, A vacuum bag is placed over the outside of the ligand and a vacuum is drawn; S222, the vacuum bag and the assemblies are placed together in an oven for thermosetting to form the slab.

[0011] For example, in a transfer box bending forming process provided by at least one embodiment of the present invention, before the step of thermosetting the assemblies to form a blank, the process further includes: S211, support strips are laid in the gaps between several of the unit plates to form positioning supports; S212, support substrates are laid on both sides of the assembly, and the support strips support the support substrates on both sides to prevent the composite sandwich panel from deforming.

[0012] For example, in a transfer box bending forming process provided by at least one embodiment of the present invention, the outer periphery of the support strip is covered with an isolation film, and an isolation film is also provided between the support substrate and the assembly. The isolation film is used to isolate the hot melt adhesive so that the support strip and the support substrate can be separated from the blank before bending forming.

[0013] For example, in a transfer box bending and forming process provided by at least one embodiment of the present invention, the hot melt adhesive layer includes a continuous adhesive film layer and a mesh adhesive film layer, and the continuous adhesive film layer and the mesh adhesive film layer are used in combination to increase the bonding strength.

[0014] According to another aspect, at least one embodiment of the present invention also provides a transfer box, including a box body, a box lid and / or a box bottom, wherein the box body, the box lid and / or the box bottom are prepared using the transfer box bending forming process according to any one of claims 1 to 8, and the box body and the box lid are connected by connectors.

[0015] The beneficial effects of this invention are as follows: In this invention, unit panels are cut and laid flat according to the unfolded material of the accessory. These are then connected into a plate-shaped blank using hot melt adhesive and a wear-resistant fabric layer. By bending the wear-resistant fabric layer corresponding to the gaps between adjacent unit panels, the blank is formed into a box-shaped lid, bottom, or body with an open top, or a box-shaped body with open top and bottom, thus obtaining the initial blank of the accessory. Finally, L-shaped corner pieces are bonded to the corners, which increases the corner strength of the initial blank and maintains right angles at the corners, ultimately forming the finished accessory. The finished accessory only needs to be connected to other accessories via connectors to form a complete transport box. Compared to traditional transport boxes, this method saves on the connectors required for assembling the lid, bottom, or body, reducing the weight of the transport box. Furthermore, the above method is simple to form, requiring only the cutting of unit panels and wear-resistant fabric layers of appropriate sizes using machining equipment, saving on the mold opening costs of lightweight transport boxes. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are merely some exemplary embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the content of the exemplary embodiments of the present invention and these drawings without any creative effort.

[0017] Figure 1 This is a schematic diagram of the process flow of the present invention; Figure 2 This is a schematic diagram showing the installation method of the end face unit panels and side panel unit panels of the box lid or box body; Figure 3 A schematic diagram showing the installation method for the side panel units of the enclosure; Figure 4 A schematic diagram of the first angle structure for laying unit panels and support strips; Figure 5 A schematic diagram of the second-angle structure for laying unit panels and support strips; Figure 6 A schematic diagram of the overall structure of a composite material for pre-curing application; Figure 7 for Figure 6 Schematic diagram of the cross-sectional structure of the ligand shown; Figure 8 A schematic diagram of a slab structure in which the support strips and support substrate are removed after thermosetting; Figure 9 A schematic diagram of the first angle structure after concealing a side panel unit plate in the lid or bottom of the finished box; Figure 10 A schematic diagram of the second angle structure after concealing a side panel unit plate in the lid or bottom of the finished box; Figure 11 A schematic diagram of the structure after concealing a side panel unit in the finished box body; Figure 12 This is a schematic diagram of the finished product transfer box after concealing the connecting parts. Figure 13 This is a schematic diagram of the structure of another type of finished transport box with the connectors concealed. In the diagram: 100, unit board; 110, end face unit board; 120, side panel unit board; 130, recessed step; 200, support strip; 300, support substrate; 400, release film; 500, hot melt adhesive layer; 510, continuous adhesive layer; 520, mesh adhesive layer; 600, angle piece; 700, lid; 800, box body; 900, bottom of box. Detailed Implementation

[0018] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it.

[0019] To keep the drawings concise, each drawing only schematically shows the parts relevant to the invention; these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some drawings, only one of components with the same structure or function is schematically shown, or only one is labeled. In this document, "one" not only means "only one," but can also mean "more than one," and "several" includes "two" and "more than two."

[0020] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0021] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0022] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of description and simplification of operation, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0023] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0024] This process is applied to the mass production of composite material transfer boxes, specifically involving the processing of box lids, bottoms, or bodies by bending composite sandwich panels. These transfer boxes are mostly used for the storage and transportation of precision electronic equipment and instruments, and have specific requirements for their weight, weather resistance, and structural strength. Traditional metal-framed boxes with wooden panels are too heavy, while integrally molded composite material boxes require customized three-dimensional molds, resulting in excessively high mold costs for small-batch production. The planar composite and bending process reduces mold investment while ensuring structural integrity.

[0025] like Figure 1 As shown, this illustrates a bending and forming process for a transfer box according to an embodiment of the present invention, used to manufacture transfer box accessories. The transfer box accessories are one of the following: box body 800, box lid 700, and box bottom 900. Specifically, the process includes four steps: material preparation and cutting, laying and assembly, bending and forming, and edge and corner reinforcement. (Refer to...) Figure 2 and Figure 3 In the material preparation and cutting process, the raw material is a composite sandwich panel, preferably a carbon fiber composite sandwich panel. The composite sandwich panel is cut into several unit panels 100 according to a preset size using machining equipment. The form of the unit panels 100 varies depending on the accessories being manufactured. For example... Figure 2As shown, when manufacturing a box-shaped lid 700, bottom 900, or body 800 with only a top opening, one of several unit panels is an end face unit panel 110, and the other four are side panel units 120. The planar outline of the end face unit panel 110 is consistent with the end face shape of the lid 700, bottom 900, or body 800, and the four side panel units 120 correspond to the four side walls of the lid 700, bottom 800, or body 800, respectively. During the installation and assembly process, the four side panel units 120 are laid flat around the end face unit panel 110, with a gap between each side panel unit panel 120 and the adjacent edges of the end face unit panel 110. After the end face unit plate 110 and the four side wall unit plates 120 are formed, a hot melt adhesive layer 500 and a wear-resistant fabric layer are sequentially applied to the outer surface. After heating and curing, the end face unit plate 110 and the side wall unit plates 120 are connected as a whole through the wear-resistant fabric layer. After the assembly cools and sets, it becomes a blank. In the bending and forming process, the blank is folded upward along the gap between the side wall unit plates 120 and the end face unit plate 110. All four side wall unit plates 120 are bent to a position perpendicular to the end face unit plate 110, forming a box cover blank or box bottom blank with a top opening. In the corner reinforcement process, corner pieces 600 are bonded to the inner corners of the box cover blank or box bottom blank. The corner pieces 600 are also bonded and fixed to the two adjacent unit plates to obtain the finished box cover or box bottom. In addition to strengthening the corners, the corner pieces 600 can also prevent the blank from springing back after bending through their own structure, thereby ensuring the uniform shape of the finished box cover or box bottom. The angle bar 600 is preferably an L-shaped cross-section beam formed by pultrusion, and the material is preferably a carbon fiber plate formed by curing carbon fiber fabric prepreg.

[0026] The finished components formed using the above method are a box-shaped lid 700 with a top opening, a box body 800, or a box bottom 900. Assembling the lid 700, box body 800, and box bottom 900 according to requirements will form the transport box. For example... Figure 11 As shown, a box body 800 and a box cover 700 can be assembled into a transfer box by means of a connector.

[0027] On the other hand, unlike the above embodiments, the box 800 is a box shape with openings at the top and bottom, and its manufacturing process differs from that of the above embodiments as follows: Figure 3 As shown, several unit panels 100 are laid out in a linear array of four side panel units 120, which together form a box-shaped box 800 with openings at the top and bottom.

[0028] The combination of the pre-reserved gap between adjacent unit panels 100 and the outer surface composite wear-resistant fabric layer is the core of achieving planar blank bending and forming. When the blank is not bent, the gap is only connected by the wear-resistant fabric layer and the hot melt adhesive layer, without a rigid core layer filling it. During bending, the inner spacing of the gap decreases, and the outer spacing is supported by the wear-resistant fabric layer to bear the tensile stress. The blank can be bent along the center line of the gap, and the core layer end faces of the side unit panel 120 and the end face unit panel 110 will not squeeze each other. After bending to 90 degrees, the wear-resistant fabric layer forms a continuous fiber connection on the outer side of the corner, ensuring the tensile strength at the corner. If there is no pre-reserved gap between the unit panels, the core layer is continuously distributed at the corner. During bending, the inner side of the core layer is compressed and the outer side is stretched. The sandwich foam material is prone to breakage and delamination, and cannot maintain an intact outer surface structure.

[0029] Reference Figure 2 , Figure 3 , Figure 9 , Figure 10 Each unit panel 100 has a recessed step 130 machined along its adjacent edges. The recessed step 130 can be formed by machining a complete panel surface. The recessed step 130 is located on the side of the unit panel 100 facing inwards, and the depth of the step matches the wall thickness of the angle member 600. The angle member 600 has a right-angled cross-section, and its two right-angled sides are respectively bonded to the surfaces of the recessed steps 130 of the two adjacent unit panels 100. After bonding, the inner surface of the angle member 600 is flush with the inner surface of the unit panel 100 and will not protrude into the box, ensuring the flatness of the box's interior surface. The stepped surface formed between the recessed step 130 and the unit plate 100 of normal thickness can provide installation positioning for the angle bracket 600, allowing the two opposite sides of the angle bracket 600 to abut against the stepped surface of the adjacent unit plate 100, preventing the angle bracket 600 from shifting during the bonding process. Simultaneously, increasing the side contact between the angle bracket 600 and the recessed step 130 of the unit plate 100 can position the adjacent unit plates 100, allowing the wear-resistant fabric layer between adjacent unit plates 100 to be stretched. If the recessed step 130 is not provided at the edge of the unit plate 100, the angle bracket 600 will be directly bonded to the inner surface of the unit plate 100, causing the angle bracket 600 to protrude into the box and occupy the loading space inside the box 800.

[0030] The composite sandwich panel adopts a sandwich structure, with the upper and lower layers being carbon fiber layers formed by curing carbon fiber prepreg, and the middle core layer being a foamed sandwich panel. The carbon fiber layers bear the in-plane tensile and bending loads, while the foamed core layer maintains the panel thickness and provides impact resistance and cushioning. The combination of these two materials achieves high structural stiffness with a relatively low areal density. The fiber arrangement direction of the surface layer can be adjusted according to the stress requirements of the enclosure, and the core layer density can be selected within the range of 30 kg / m³ to 80 kg / m³ according to the impact resistance requirements.

[0031] The thermosetting step in the assembly process is implemented using vacuum bag sealing and oven heating. After the components are laid, a vacuum bag is placed over the entire assembly, the edges of the vacuum bag are sealed, and the internal air is extracted, reducing the air pressure inside the vacuum bag to 10 kPa to 20 kPa. Atmospheric pressure is applied evenly to the surface of the components through the vacuum bag, ensuring tight adhesion between the layers and preventing air bubbles or delamination. After sealing, the vacuum bag, along with the components inside, is placed in an oven and heated to the curing temperature according to a preset temperature rise curve. After holding at that temperature for a specified time, it is cooled in the oven to obtain a cured slab. The vacuum environment eliminates residual air between layers, improving the bonding uniformity of the hot melt adhesive layer 500; the overall heating in the oven ensures consistent temperature across all areas of the slab, resulting in more uniform curing.

[0032] Preferably, the hot melt adhesive layer 500 is PP adhesive, and the compound should be kept in an oven at a temperature between 110°C and 130°C for at least 30 minutes.

[0033] Reference Figure 4 and Figure 5 Before the thermosetting process begins, to prevent deformation of the vacuum-extruded composite sandwich panel, a support strip 200 is first laid in the gap between the end face unit panel 110 and the side wall unit panel 120. The cross-sectional shape of the support strip 200 matches the gap cross-section, and its length is consistent with the side length of the unit panel. After being laid, it fills the gap, and the support strip 200 determines the size of the gap between adjacent unit panels, forming a positioning support to ensure the consistency of the box lids or bottoms of the same batch. Preferably, the step surface formed between the recessed step 130 on the side of the unit panel and the normal thickness unit panel is a slope, and the support strip 200 has a trapezoidal cross-section adapted to the step surface. This facilitates assembly and increases the contact area between the support strip 200 and the unit panel, reducing the compressive force per unit area of ​​the unit panel.

[0034] Reference Figure 6 , Figure 7 After the support strips are laid, support substrates 300 are laid on the upper and lower sides of the assembly, respectively. The wear-resistant fabric layer and hot melt adhesive layer 500 are located between the two support substrates 300. The support substrates 300 are rigid flat plates. The upper and lower surfaces of the support strips 200 abut against the support substrates 300 on both sides, providing intermediate support for the support substrates 300. The support substrates 300 can ensure the flatness of the slab surface during forming. (Refer to...) Figure 6 and Figure 7 During vacuum pressing, the support strip 200 can counteract the atmospheric pressure on the support substrate 300, preventing the blank from denting and deforming under pressure. If the support strip 200 and support substrate 300 are missing, there will be no rigid support at the gap during vacuum pressing, and the blank will dent into the gap under pressure. After curing, the surface flatness will be insufficient, and the verticality of the side panel 120 after bending cannot be guaranteed.

[0035] Furthermore, to prevent the support strip and support substrate from sticking together with the adhesive film, the outer surface of the support strip 200 is covered with a release film 400, and the side of the two support substrates 300 that contacts the assembly is also covered with a release film 400. The release film 400 has a low surface energy and is a non-porous film material that does not react with the hot melt adhesive. After curing, the support strip 200 and support substrate 300 can be easily separated from the blank through the release film 400 without sticking to the blank surface, ensuring the smooth progress of the bending process. If the release film 400 is not provided, the hot melt adhesive will seep into the surface pores of the support strip 200 and support substrate 300 after melting, and form an adhesive after curing. This will damage the surface structure of the blank during disassembly, affecting the appearance and bending accuracy of the finished product.

[0036] Preferably, both the support strip 200 and the support substrate 300 are made of carbon fiber fabric. In actual production, waste carbon fiber sheets can be used for cutting and manufacturing to improve material utilization.

[0037] Optionally, in the assembly and installation process, the installation can be carried out in the order from bottom to top, such as in the order of first support substrate 300, first release film 400, composite sandwich panel and support strip 200, hot melt adhesive layer 500, wear-resistant fabric layer, second release film 400, and second support substrate 300.

[0038] The wear-resistant fabric layer is preferably made of polypropylene blended fiber sheet, with the sheet's width covering the entire outer surface of the finished box lid or bottom. After curing, the wear-resistant fabric layer is bonded to the outer surface of all unit panels using a hot melt adhesive layer 500. This serves both as an outer surface wear-resistant layer to improve the box's scratch resistance and as a continuous fiber connecting layer to bear tensile loads at corners. The weave density of the fabric can be adjusted according to wear resistance requirements, and the weave pattern can be plain or twill.

[0039] Preferably, the hot melt adhesive layer 500 includes a continuous adhesive layer 510 and a mesh adhesive layer 520 with release paper as the carrier. The combined use of the two hot melt adhesive layers can improve the bonding strength between the wear-resistant fabric layer and the unit board. The order of laying the release paper adhesive layer 510 and the mesh adhesive layer 520 is not limited. For example, the release paper adhesive layer 510 can be laid on the surface of the unit board or on the surface of the wear-resistant fabric layer.

[0040] refer to Figure 8 After thermosetting is complete and before bending, the support substrate 300 and support strip 200 are removed to form a blank for bending.

[0041] Reference Figure 9 , Figure 10During the bending process, the end face unit plate 110 and side wall unit plate 120 connected to the wear-resistant fabric layer can be formed into a box shape with an open top by cutting or folding. After bending, the angle piece 600 is bonded to the corners between the side wall unit plate 120 and the end face unit plate 110, as well as the corners between adjacent side wall unit plates 120. The angle piece 600 can ensure the shaping of the corners and increase the strength of the corners.

[0042] refer to Figure 11 During the bending process, the unit plate 100 adjacent to the wear-resistant fabric layer can be formed into a box shape with openings at the top and bottom by cutting or folding. After bending, the angle bracket 600 is bonded to the corner between adjacent unit plates 100. The angle bracket 600 can ensure the shaping of the corner and increase the strength of the corner.

[0043] In practice, the bending and forming process and the corner reinforcement process can be carried out simultaneously. After the blank is manually pre-folded, it is placed into the box mold, so that the end unit plate 110 is attached to the bottom of the mold and the side unit plate 120 is attached to the side of the mold. Then, the operator adds the corner plate 600 from the inside and makes the corner plate 600 push the wear-resistant fabric layer to the position of being attached to the corner of the mold. After bonding the corner plate 600 and the unit plate with low viscosity ethyl cyanoacrylate quick-drying adhesive, the finished box lid or box bottom can be formed.

[0044] like Figure 12 As shown, the transport box manufactured using the above process includes a lid 700, a body 800, and a bottom 900. Both the lid 700 and the bottom 900 are manufactured using the aforementioned bending and forming process, with their openings facing each other. The body 800 can be manufactured using the aforementioned bending and forming process, or it can be composed of four side panels connected circumferentially, forming a vertically continuous rectangular cylindrical structure. The upper surface of the body 800 is aligned with the edge of the opening of the lid 700, and the lower surface is aligned with the edge of the opening of the bottom 900. The connection is secured using connectors. The connectors can be bolts, rivets, or quick-release latches to accommodate different assembly and disassembly frequencies.

[0045] The side panels that make up the 800mm box body adopt a sandwich composite structure, consisting of a wear-resistant surface layer, an outer carbon fiber layer, a foam core layer, and an inner carbon fiber layer from the outside to the inside. Adjacent layers are bonded together with an adhesive film and then cured under vacuum heat to form a single integrated structure. The molding process of the side panels is the same as the planar composite process of the box lid and bottom, requiring only adjustments to the cutting dimensions to obtain side panels of the corresponding specifications. The thickness of the side panels is consistent with the side wall thickness of the box lid and bottom, ensuring the overall appearance harmony of the box.

[0046] Both of the above methods can form the box body 800 into a box-shaped structure with two openings at the top and bottom, which are connected by connectors and box cover 700 and box bottom 900 to form a complete transfer box.

[0047] On the other hand, such as Figure 13 As shown, unlike the above, the transfer box consists of only a box cover 700 and a box body 800. The box body 800 is formed by using the above bending process or by splicing sandwich composite panels to form a box-shaped structure with an open top. It is connected to a box cover 700 with the same box-shaped structure with an open top by a connector to form the transfer box.

[0048] It should be further explained that the wear-resistant surface layer is preferably a polypropylene blended woven fabric, the foamed core layer is preferably a polypropylene foamed core material, and the inner and outer carbon fiber skin layers are both formed by curing carbon fiber prepreg; after the board is cured, it is cut according to the box design dimensions and enclosed to form a box frame with openings at both ends.

[0049] Alternatively, the composite sandwich panel can be made of the same material as the side panel, and the wear-resistant surface layer can be removed before cutting.

[0050] The connecting parts between the lid 700 and the body 800, and between the body 800 and the bottom 900, are existing technologies. Depending on the application, they include, but are not limited to, hinges, metal edging, bolts, nuts, screws, and other assembly parts. For details, please refer to the connecting parts used for assembling wooden boards, which will not be elaborated here.

[0051] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A bending and forming process for a transfer box, used to manufacture accessories for the transfer box, wherein the accessories are one of a box lid, a box bottom, or a box body, characterized in that, include: S100, which manufactures composite sandwich panels into several unit panels; S200, the unit plate is laid face down on a plane according to the unfolded material shape of the accessory, and there is a gap between two adjacent unit plates. A hot melt adhesive layer and a wear-resistant fabric layer are sequentially applied to the back of the unit plate to form an assembly. The assembly is thermo-cured to form a blank. S300, fold the blank along the gap between adjacent unit plates to form the initial blank of the accessory; S400, corner pieces are bonded to the corners of the component blank, so that the corner pieces are connected to the adjacent unit plates to form finished components.

2. The bending and forming process for a transfer box according to claim 1, characterized in that, When the accessory is either a lid or a bottom of a box. The composite sandwich panel described in S100 is made into one end face unit panel and four side wall unit panels; In S200, with the end face unit plate as the center, four side unit plates are circumferentially spaced around the end face unit plate.

3. The bending and forming process for a transfer box according to claim 2, characterized in that, The edges of the side panel adjacent to other side panel units and the edges of the side panel adjacent to the end panel unit have recessed steps. The end panel unit has recessed steps on all four sides. The two sides of the angle piece are respectively used to bond to the recessed steps of two adjacent side panel units or the side panel unit and the end panel unit, so that the assembly maintains the shape of the finished part.

4. The bending and forming process for a transfer box according to claim 1, characterized in that, When the accessory is a box body The composite sandwich panel described in S100 is made into at least four side panel units; In S200, several of the side panel units are laid out in a linear array.

5. The bending and forming process for a transfer box according to claim 4, characterized in that, The edge of the side panel adjacent to the other side panel has a recessed step, and the two sides of the angle piece are respectively used to bond to the recessed steps of the two adjacent side panel to maintain the shape of the finished accessory.

6. The bending and forming process for a transfer box according to claim 1, characterized in that, In S200, the step of thermosetting the ligands to form a slab specifically includes: S221, A vacuum bag is placed over the outside of the ligand and a vacuum is drawn; S222, the vacuum bag and the assemblies are placed together in an oven for thermosetting to form the slab.

7. The bending and forming process for a transfer box according to claim 1, characterized in that, Prior to the step of thermosetting the ligands to form a slab, the method further includes: S211, support strips are laid in the gaps between several of the unit plates to form positioning supports; S212, support substrates are laid on both sides of the assembly, and the support strips support the support substrates on both sides to prevent the composite sandwich panel from deforming.

8. The bending and forming process for a transfer box according to claim 7, characterized in that, The outer periphery of the support strip is covered with an isolation film, and an isolation film is also provided between the support substrate and the assembly. The isolation film is used to isolate the hot melt adhesive so that the support strip and the support substrate can be separated from the blank before bending and forming.

9. The bending and forming process for a transfer box according to claim 1, characterized in that, The hot melt adhesive layer includes a continuous adhesive film layer and a mesh adhesive film layer, which are used in combination to increase the bonding strength.

10. A transfer box, characterized in that, The container includes a box body, a box lid, and / or a box bottom. The box body, box lid, and / or box bottom are manufactured using the transfer box bending and forming process described in any one of claims 1 to 8. The box body and the box lid, and / or the box body and the box bottom are connected by connectors.

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