Corner sandwich panel and manufacturing method thereof

Abstract

The invention relates to a corner sandwich panel and a manufacturing method thereof. The corner structure comprises an outer skin plate, a core material and an inner skin plate, the core material is arranged between the outer skin plate and the inner skin plate, the corner position of the outer skin plate is provided with a bending transition connecting structure formed in a non-cutting bending mode, and in the bending process, plate materials of the bending transition connecting structure are transferred to the inner side of the outer skin plate after the corner is turned. The sandwich board does not need to be integrally cut, the integral continuity and structural integrity of the outer skin board, the core material and the inner skin board can be effectively guaranteed, the material utilization rate is increased, the machining loss is reduced, meanwhile, the waterproof performance of the corner part of the sandwich board is effectively improved, the water inflow risk is reduced, corrosion of the outer skin metal material is avoided, and the service life of the sandwich board is prolonged. And the service life of the sandwich panel is obviously prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of corner plates, and in particular to a corner sandwich panel and a manufacturing method thereof. Background Art

[0002] For the production of existing corner sandwich panels, the lap joints of the core material, the inner skin plate and the outer skin plate are cut off from a flat sandwich panel, and only one layer of outer skin is retained for cutting the corner, as shown in Figures 54 to 56 Shown. This method destroys the integrity of the corner sandwich panel, resulting in no waterproof function, insufficient structural strength, and water leakage and corrosion at the corner position, affecting the service life and appearance. In addition, the method of cutting corners is complex in construction, wasteful of materials, and low in processing efficiency, and cannot meet the requirements of high-standard building curtain walls for aesthetics, durability and waterproof performance. Summary of the Invention

[0003] Therefore, the present invention provides a corner sandwich panel and a manufacturing method thereof, which do not require overall cutting of the sandwich panel, can effectively ensure the overall continuity and structural integrity of the outer skin plate, the core material and the inner skin plate, not only improve the material utilization rate, reduce the processing loss, but also effectively improve the waterproof performance of the corner part of the sandwich panel, prevent water from entering, avoid corrosion of the outer metal material, and the service life of the corner sandwich panel can be at least doubled.

[0004] To solve the above technical problems, the present invention provides a corner sandwich panel, including an outer skin plate, a core material and an inner skin plate formed by bonding, the core material is arranged between the outer skin plate and the inner skin plate,

[0005] The outer skin plate is provided with a bending transition connection structure formed by non-cutting bending at the corner position. During the bending process, the sheet material of the bending transition connection structure is transferred to the inner side of the outer skin plate after the corner.

[0006] In an embodiment of the present invention, the bending transition connection structure is provided with material waterproofing and / or structural waterproofing. When the bending transition connection structure is provided with material waterproofing, structural adhesive is injected into the bending transition connection structure during or after bending, or a waterproof film is attached to the vertical edge to be bent of the semi-finished workpiece of the outer skin plate before bending.

[0007] In an embodiment of the present invention, the bending transition connection structure adopts a structural waterproofing of high-low staggered waterproof lap joint, including a lap lower plate settlement step and a lap upper plate convex tongue that are stacked up and down in a staggered manner to form a waterproof lap joint. The depth of the lap lower plate settlement step matches the thickness of the lap upper plate convex tongue, and they overlap with each other to form a triangular structure. The overlap amount is smaller at the position closer to the bending rotation center point of the outer skin plate, and vice versa.

[0008] In an embodiment of the present invention, the maximum perimeter of the outer opening of the geometric shape for structural waterproofing formed by the bent transition connection structure extending to the inner side is equal to the top length of the bent transition connection structure before bending, and the dimensions of the folding arc gap width of the corner plate, the folding arc gap depth of the corner plate, and the offset overlap amount can be arbitrarily combined between the maximum and minimum values that satisfy the structural waterproofing and the forming process dimensions.

[0009] In an embodiment of the present invention, the formed rabbet of the outer skin plate in the width direction includes an outer curled edge and an inner curled edge. When lapping, a lapping structure obtained by lapping the outer curled edge and the inner curled edge, or a lapping structure obtained by lapping the outer curled edges is formed between two adjacent outer skin plates.

[0010] In an embodiment of the present invention, the corner sandwich panel includes a four-sided rabbet sandwich panel and a two-sided rabbet sandwich panel structure; the inner skin plate adopts a non-cut integral bending structure.

[0011] The present invention also provides a manufacturing method for a corner sandwich panel, including:

[0012] S1. Cut notches on the outer skin steel plate, and use roll forming or bending to form rabbets on both sides of the steel coil to form an outer curled edge and an inner curled edge, obtain notches, and get a semi-finished workpiece to be bent.

[0013] S2. Transport the semi-finished workpiece to be bent to the corner plate forming equipment; wherein, the corner plate forming equipment includes a frame and the following components arranged on the frame:

[0014] A fixed blank holding assembly, including a fixed base blade, on which a first blank holding knife and first core lifting folding knives located on the transverse two sides of the first blank holding knife are arranged; wherein, a folding knife female die is arranged on the first core lifting folding knife.

[0015] A flap bending assembly, arranged on the longitudinal one side of the fixed blank holding assembly, includes a flap driving device and a flap base blade. The flap driving device can drive the flap base blade to flip relative to the fixed base blade. A second blank holding knife and second core lifting folding knives located on the transverse two sides of the second blank holding knife are arranged on the flap base blade; wherein, a folding knife male die is arranged on the second core lifting folding knife.

[0016] Two groups of side extrusion and feeding assemblies, respectively located on the transverse two sides of the fixed base blade, and each side extrusion and feeding assembly includes a side top knife.

[0017] A first side die assembly and a second side die assembly, the first side die assembly includes outer male dies symmetrically arranged on both sides of the fixed base blade along the transverse direction and capable of moving transversely.

[0018] The second side die assembly includes pressure-side blades symmetrically arranged along the transverse direction on both sides of the flap base blade and capable of transverse movement. The pressure-side blades can flip synchronously with the flap base blade.

[0019] S3. Start the first pressure blade. The first core-lifting folding cutter, folding cutter die, and follow the first pressure blade to clamp the semi-finished workpiece. The second pressure blade starts, and the second core-lifting folding cutter and core-lifting folding cutter punch follow to clamp the semi-finished workpiece. The first side die assembly and the second side die assembly start. The outer punch cooperates with the folding cutter die to clamp the to-be-bent vertical edge of the semi-finished workpiece, forming a settlement step for the overlapping lower plate.

[0020] S4. Start the two groups of side extrusion and feeding assemblies. The two side top blades are respectively pressed against the middle position of the to-be-bent vertical edge, forcing the transfer material of the to-be-bent vertical edge to transfer towards the center of the corner during the bending process. The flap bending assembly flips, and the side top blades remain pressed against the middle position of the transferred material.

[0021] S5. Before the critical point where the folding cutter die and the outer punch and the folding cutter punch cooperating with it respectively touch the side top blades, the two side top blades withdraw from the bending area. The flap bending assembly continues to flip. When the remaining transfer material of the to-be-bent vertical edge is pushed to the cavity entrance of the folding cutter die by the folding cutter punch, the flap bending assembly stops flipping.

[0022] S6. At this time, the folding cutter punch and the folding cutter die have not yet contacted, and the outer punch withdraws. A flat-mouth outer die is filled at the step of the outer punch, so that the flat-mouth outer die and the outer punch form a plane. The outer punch closes and the transition connection structure with the outer skin plate forms a cavity with the step formed in step S3. The flap bending assembly starts to flip continuously. When the folding cutter punch enters the cavity with the strip material, from the time when the side top blades withdraw from the bending area in step S5 until before the bending punch closes, it is in an air-bending state and cannot form a transition connection structure. Through the bending punch, the sheet material is forced into the cavity to form a transition connection structure.

[0023] S7. Bend to the predetermined angle to form the bent outer skin plate. The first pressure blade remains pressed. The second pressure blade withdraws to a height higher than the bent edge of the outer skin plate. The rest of the tools are all reset. Finally, the first pressure blade is released, and the outer skin plate is taken out.

[0024] S8. Apply glue to the bent outer skin plate, and put it together with the core material and the inner skin plate into a V-shaped mold for combined pressing and curing to form a corner sandwich panel.

[0025] In an embodiment of the present invention, when the semi-finished workpiece to be bent enters the corner plate forming device, an inner positioning method of passing through the inner sides of the first core-pulling folding knife and the second core-pulling folding knife or an outer positioning method of positioning by setting an outer positioning device is adopted. When the outer positioning method process is adopted, the core-pulling knife is core-pulled through an inclined slider. The inclined sliders connected to the core-pulling knife and installed on both sides of the blank-holding knife push the core-pulling knife into the inner-rolled edge semi-closed cavity. When discharging, the inclined slider pulls the core-pulling knife out of the inner-rolled edge cavity.

[0026] In an embodiment of the present invention, between the first core-pulling folding knife and the first blank-holding knife, and between the second core-pulling folding knife and the second blank-holding knife, through the core-pulling process of the inclined slider, the core-pulling folding knife can smoothly enter and exit the inner-rolled edge semi-closed cavity of the workpiece.

[0027] In an embodiment of the present invention, the side extrusion and material guiding assembly further includes a gearbox reduction device and a blank-holding driving device;

[0028] Among them, the turning plate base blade is provided with a turning plate rotating shaft. The outer side of the cutting edge of the turning plate base blade rotates with the center axis of the turning plate rotating shaft as the center of the circle. The outer side of the cutting edge of the turning plate base blade and the center axis of the turning plate rotating shaft are separated by the thickness of the plate to be bent.

[0029] The input end of the gearbox reduction device is connected to the turning plate rotating shaft, and the output end is connected with a rotating shaft. The blank-holding driving device is installed on the rotating shaft, and its driving end is connected to the side blank-holding knife through a tool bar. The tool bar is slidably connected to the rotating shaft. The gearbox reduction device can make the rotation speed of the turning plate rotating shaft twice that of the rotating shaft. The rotation center cutting edge of the side blank-holding knife is always at the center of the angle to be bent of the outer skin plate.

[0030] The above technical solutions of the present invention have the following advantages compared with the prior art:

[0031] A corner sandwich panel and a manufacturing method thereof according to the present invention utilize the outer skin plate to pre-set the vertical edge to be bent and adopt a non-cutting bending process, so that a continuous and integral transition connection structure is formed at the corner, achieving the following advantages:

[0032] Adopting a non-cutting processing process, the outer skin plate is continuously formed at the corner position, avoiding the problem of seam side leakage caused by traditional cutting and splicing, thereby ensuring the overall structural continuity and stability of the product, preventing rainwater from entering, and the serious disadvantages of rapid corrosion of the outer skin.

[0033] At the corner part, a transition connection structure formed by the vertical edge to be bent can be provided with material waterproofing or a combined structure of structure and material for waterproofing. By using the settlement step of the overlapping lower plate and the tongue of the convex platform of the overlapping upper plate to form structural waterproofing and combining with material waterproofing, it is ensured to be tightly sealed, thereby greatly improving the waterproof performance and preventing rainwater from seeping into the core material and metal corrosion.

[0034] During the bending process, the material transfers from the outer skin plate to the inside, forming an internal folding structure, and is provided with a structural waterproof step, which greatly improves the waterproof function. At the same time, it improves the bending load-bearing capacity of the overall sandwich panel and enhances the service durability.

[0035] The present invention does not require overall cutting, eliminating the material waste and subsequent splicing and adjustment work caused by cutting, simplifying the manufacturing process, reducing processing losses, and being applicable to various specifications of outer skin plates (including four-sided tongue-and-groove and two-sided tongue-and-groove sandwich panels), thereby greatly improving production efficiency. Due to the adoption of the non-cutting overall bending process, no cutting is required at the corners, avoiding the leakage caused by the splicing gaps generated by cutting and splicing and the rusting of the cut edges in the traditional process, making the visual effect of the outer facade more flat and beautiful. The service life of the corner sandwich panel is at least doubled compared to the cut corner sandwich panels on the existing market. Brief Description of the Drawings

[0036] In order to make the content of the present invention easier to be clearly understood, the following further details the present invention according to the specific embodiments of the present invention in conjunction with the drawings.

[0037] Figure 1 It is an exploded structure diagram of the corner sandwich panel.

[0038] Figure 2 It is a schematic diagram of the structure of the outer skin plate (with structural waterproofing).

[0039] Figure 2a It is Figure 2 Schematic diagram in the A direction of

[0040] Figure 3 It is a schematic diagram of the structure of the outer skin plate (without structural waterproofing).

[0041] Figure 3a It is Figure 3 Partial enlarged view of

[0042] Figure 4 It is a schematic diagram of a semi-finished workpiece of an outer skin plate with an outer rolled edge and an inner rolled edge pasted with a waterproof film.

[0043] Figure 5 It is Figure 4 Partial enlarged schematic diagram of

[0044] Figure 6It is a schematic diagram of a semi-finished workpiece of another outer curled edge and outer curled edge structure skin plate pasted with a waterproof film.

[0045] Figure 7 It is Figure 6 a partial enlarged schematic diagram.

[0046] Figure 8 It is a schematic diagram after the waterproof film is pasted and bent.

[0047] Figure 9 It is a schematic diagram of the transition connection structure for waterproofing of the skin plate structure after closing and then opening.

[0048] Figure 9a It is Figure 9 a schematic diagram in the A direction of

[0049] Figure 9b It is Figure 9 a schematic diagram in the B direction of

[0050] Figure 9c It is Figure 9 a schematic diagram in the C direction of

[0051] Figure 10 It is a schematic diagram of the lap joint structure of the outer curled edge and the outer curled edge.

[0052] Figure 10a It is Figure 10 a partial enlarged schematic diagram.

[0053] Figure 11 It is a schematic diagram of the lap joint structure of the outer curled edge and the inner curled edge.

[0054] Figure 12 It is Figure 11 a partial enlarged schematic diagram.

[0055] Figure 13 It is a schematic diagram of the structure of the semi-finished workpiece.

[0056] Figure 14 It is Figure 13 a partial enlarged schematic diagram.

[0057] Figure 15 It is a schematic diagram of the structure on one side after the semi-finished workpiece is bent.

[0058] Figure 16 It is Figure 15 a partial enlarged schematic diagram.

[0059] Figure 17 It is a schematic diagram of the structure for waterproofing on the other side after the semi-finished workpiece is bent.

[0060] Figure 18a It is Figure 17 a partial enlarged schematic diagram of structure waterproofing (gap position dimension).

[0061] Figure 18b Yes Figure 17 Partial enlarged schematic diagram of structural waterproofing (bending arc dimension).

[0062] Figure 18c Yes Figure 17 Partial enlarged schematic diagram of structural waterproofing (straight end dimension).

[0063] Figure 19 Schematic diagram of the structure on one side of the inner skin board.

[0064] Figure 20 Schematic diagram of the structure on the other side of the inner skin board.

[0065] Figure 21 Schematic diagram of the structure of the double-sided tongue-and-groove sandwich panel.

[0066] Figure 22 Yes Figure 21 Partial enlarged schematic diagram.

[0067] Figure 23 Schematic diagram of the structure of the four-sided tongue-and-groove sandwich panel.

[0068] Figure 24 Yes Figure 23 Partial enlarged schematic diagram.

[0069] Figure 25 Overall structural schematic diagram of the corner plate forming equipment.

[0070] Figure 26 Yes Figure 25 Partial enlarged schematic diagram.

[0071] Figure 27 Schematic diagram after simplifying the front view structure of the corner plate forming equipment.

[0072] Figure 28 Top view structural schematic diagram of the corner plate forming equipment.

[0073] Figure 29 Yes Figure 28 Partial enlarged schematic diagram.

[0074] Figure 30 Schematic diagram of the front view of the corner plate forming equipment (state 1 of the folding cutter sliding).

[0075] Figure 31 Yes Figure 30 Partial enlarged schematic diagram of the angled slider core pulling at point A in

[0076] Figure 32 Yes Figure 30 Partial enlarged schematic diagram of the angled slider core pulling at point B in

[0077] Figure 33 It is a front view schematic diagram of the corner plate forming equipment (folding bending knife sliding state two).

[0078] Figure 34 It is Figure 33 A partial enlarged schematic diagram at position A in

[0079] Figure 35 It is Figure 33 A partial enlarged schematic diagram at position B in

[0080] Figure 36 It is the state diagram of the corner plate forming equipment in step S3.

[0081] Figure 37 It is Figure 36 A partial enlarged schematic diagram of

[0082] Figure 38 It is the state diagram of the corner plate forming equipment in step S4.

[0083] Figure 39 It is Figure 38 A partial enlarged schematic diagram of

[0084] Figure 40 It is the state diagram of the corner plate forming equipment in step S5.

[0085] Figure 41 It is Figure 40 A partial enlarged schematic diagram of

[0086] Figure 42 It is the state diagram of the corner plate forming equipment in step S6.

[0087] Figure 43 It is Figure 42 A partial enlarged schematic diagram of

[0088] Figure 44 It is a schematic diagram of the V-shaped mold.

[0089] Figure 45 It is the state diagram of one side of the corner plate forming equipment.

[0090] Figure 45a It is Figure 45 A partial enlarged schematic diagram of

[0091] Figure 46 It is the state diagram of the other side of the corner plate forming equipment.

[0092] Figure 47 It is the state diagram of one side of the corner plate forming equipment in step S6 (state one).

[0093] Figure 47a It is Figure 47 A partial enlarged schematic diagram of

[0094] Figure 48 It is the state diagram (state one) of the other side of the corner plate forming equipment in step S6.

[0095] Figure 49 It is the exploded view (state two) of one side of the corner plate forming equipment in step S6.

[0096] Figure 49a It is Figure 49 The partial enlarged schematic diagram of

[0097] Figure 50 It is the exploded view (state two) of the other side of the corner plate forming equipment in step S6.

[0098] Figure 51 It is the forming process diagram of the outer skin plate with an inner crimp.

[0099] Figure 52 It is the state diagram of the outer skin plate with an inner crimp in step S6.

[0100] Figure 52a It is Figure 52 The partial enlarged schematic diagram of

[0101] Figure 52b It is the simplified diagram before the forming of the outer skin plate with an inner crimp in step S6.

[0102] Figure 53 It is the exploded view of the outer skin plate with an inner crimp in step S6.

[0103] Figure 54 It is the schematic diagram of the bending process of the four-sided tongue-and-groove board in the prior art (semi-finished product).

[0104] Figure 55 It is the schematic diagram of the four-sided tongue-and-groove board with a notch in the prior art (finished product).

[0105] Figure 56 It is Figure 55 The partial enlarged schematic diagram of

[0106] Explanation of the reference numerals in the drawings of the specification:

[0107] 100. Outer skin plate; 110. Transition connection structure; 110a. Sinking step of the overlapping lower plate; 110b. Protruding tongue of the overlapping upper plate; 120a. Outer crimp; 120b. Inner crimp; 130. Waterproof membrane; 140. Overlapping structure; 150. Closing edge;

[0108] 200. Inner skin plate;

[0109] 300. Core material;

[0110] 400, Semi-finished workpiece; 410, Notch; 420, Vertical edge to be bent

[0111] 500, Double-sided rabbeted sandwich panel structure; 600, Four-sided rabbeted sandwich panel; 610, Waterproof edge

[0112] 1, Fixed pressure material assembly; 11, Fixed base blade; 12, First pressure material knife; 13, First core lifting and bending knife; 131, Bending knife concave die; 132, Flat mouth outer die; 133, Cavity; 14, First mounting bracket; 15, First pressure material driving device; 16, First tool holder

[0113] 2, Flap bending assembly; 20, Flap driving device; 21, Flap base blade; 22, Second pressure material knife; 23, Second core lifting and bending knife; 231, Bending knife convex die; 24, Second mounting bracket; 25, Second pressure material driving device; 26, Second tool holder; 27, Positioning and blanking knife assembly; 271, Blanking driving cylinder; 28, Flap rotating shaft

[0114] 3, Side extrusion and feeding assembly; 31, Side top knife; 32, Gearbox reduction device; 321, Gear; 33, Top material driving device; 34, Rotating shaft; 35, Tool bar

[0115] 4, Feeding assembly; 41, Side guiding roller group; 42, Outer side positioning device

[0116] 5, First side die assembly; 51, Outer side convex die; 52, First oil cylinder

[0117] 6, Second side die assembly; 61, Pressure material side blade; 62, Second oil cylinder

[0118] 7, Machine frame

[0119] 8, V-shaped die; 81, V-shaped upper die; 82, V-shaped lower die Detailed implementation mode

[0120] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, so that those skilled in the art can better understand the present invention and be able to implement it, but the embodiments cited do not limit the present invention.

[0121] In the present invention, when directions (up, down, left, right, front, back, concave and convex) are described, it is only for the convenience of describing the technical solution of the present invention, rather than indicating or implying that the technical features referred to must have a specific orientation, be constructed and operated in a specific orientation, so it cannot be understood as a limitation of the present invention.

[0122] In the present invention, the meaning of "several" is one or more, the meaning of "multiple" is two or more, and "greater than", "less than", "exceeding", etc. are understood not to include the base number; "above", "below", "within", etc. are understood to include the base number. In the description of the present invention, if "first" and "second" are described, they are only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0123] In the present invention, unless otherwise clearly defined, words such as "arranged", "installed", "connected", etc. should be understood in a broad sense. For example, they can be directly connected, or indirectly connected through an intermediate medium; they can be fixedly connected, or detachably connected, or integrally formed; they can be mechanically connected, or electrically connected or capable of communicating with each other; they can be the communication inside two components or the interaction relationship between two components. Those skilled in the art can reasonably determine the specific meaning of the above words in the present invention in combination with the specific content of the technical solution.

[0124] Refer to Figures 1 to 3 As shown, a corner sandwich panel of the present invention includes an outer skin plate 100, a core material 300, and an inner skin plate 200 formed by bonding. The core material 300 is arranged between the outer skin plate 100 and the inner skin plate 200;

[0125] The outer skin plate 100 is provided with a bending transition connection structure 110 formed by non-cutting bending at the corner position. During the bending process, the sheet material of the bending transition connection structure 110 is transferred to the inner side of the outer skin plate 100 after the corner. Refer to Figure 2a 、 Figure 3a As shown, the part of the sheet material of the bending transition connection structure 110 transferred to the inner side of the outer skin plate 100 after the corner forms a closed folding plate.

[0126] Specifically, refer to Figures 4 to 8 As shown, the bending transition connection structure 110 is provided with material waterproofing and / or structural waterproofing. When the bending transition connection structure 110 is provided with material waterproofing, structural adhesive is injected into the bending transition connection structure 110 during or after bending, or a waterproof film 130 is attached to the to-be-bent vertical edge 420 of the semi-finished workpiece 400 of the outer skin plate 100 before bending.

[0127] Specifically, refer to Figures 9a to 9c As shown, the bending transition connection structure 110 adopts a structural waterproofing with a high-low staggered waterproof lap joint, including a lap lower plate settlement step 110a and a lap upper plate convex tongue 110b that are stacked up and down in a staggered manner to form a waterproof lap joint. The depth of the lap lower plate settlement step 110a matches the thickness of the lap upper plate convex tongue 110b, and they overlap with each other to form a triangular structure (refer toFigure 2a As shown, the closer to the bending center point of the outer skin plate 100, the smaller the overlapping amount, and vice versa. Such a design can greatly improve the strength of the corner plate.

[0128] The bending transition connection structure 110 of this embodiment is a folded triangular plate structure ( Figure 3a ), or when setting structural waterproofing on the basis of the folded triangular plate structure, extend the structural waterproofing with the above-mentioned high-low staggered waterproof overlap outside the folded triangular plate structure ( Figure 2a ).

[0129] In addition, since the depth of the settlement step 110a of the overlapping lower plate is equal to the thickness of the convex tongue 110b of the overlapping upper plate, the junction of the settlement step 110a of the overlapping lower plate and the convex tongue 110b of the overlapping upper plate is flat and seamless or has a gap. There is a rounded transition closing edge 150 at the corner top of the splicing surface (refer to Figure 16 shown), thus forming a semi-closed sealed well. After installation, inject structural adhesive into this sealed well. The sealant will not spread and flow, and will be concentrated and bite in the sealed well, achieving absolute waterproofing and a flat and beautiful plane. The top corner is slightly convex, which can ensure that the corner is not wetted and soiled for a long time, affecting the beauty of the outer facade of the corner. On the splicing surface of the folded corner, stick a waterproof film 130 in advance when bending the corner to ensure the sealing performance after corner folding.

[0130] Specifically, the maximum perimeter of the outer opening of the geometric shape of the structural waterproofing formed by the extension of the bending transition connection structure 110 to the inside is equal to the top length of the bending transition connection structure 110 before bending. H is the depth of the single-board formed tongue-and-groove (refer to Figure 16 shown), A is the width of the folded arc gap of the corner plate (sealant well width) 0 - 20 mm; refer to Figure 18a shown, T is the depth of the folded arc gap of the corner plate (seal well depth) 0 - 20 mm; S is the staggered overlap amount, within 0 - 15 mm; the maximum side length of the folded structure is (refer to Figure 14 shown); C1 to C7 are the arc lengths of each bending arc (refer to Figure 18b shown); L1 to L6 are the lengths of each straight end (refer to Figure 18c shown); it can be obtained that:

[0131]

[0132] It should be noted that a sealing well is formed by the settlement step 110a of the overlapping lower plate and the tongue 110b of the overlapping upper plate, and the sealing well is filled with structural adhesive. The depth T of the sealing well of the settlement step 110a of the overlapping lower plate, the width A of the sealing adhesive well, and the misaligned overlapping amount C satisfy any combination dimensions of the maximum free combination and the minimum free combination of the structural waterproofing and the forming process dimensions.

[0133] Specifically, referring to Figures 10 to 12 As shown, the formed rabbet of the outer skin plate 100 in the width direction includes an outer curled edge 120a and an inner curled edge 120b. When overlapping, a lap joint structure 140 obtained by overlapping the outer curled edge 120a and the inner curled edge 120b, or a lap joint structure 140 obtained by overlapping the outer curled edge 120a and the outer curled edge 120a is formed between two adjacent outer skin plates 100.

[0134] Specifically, referring to Figure 19 、 Figure 20 As shown, the corner sandwich panel includes a four-sided rabbet sandwich panel 600 and a two-sided rabbet sandwich panel structure 500; referring to Figure 21 、 Figure 24 As shown, the inner skin plate 200 adopts a non-cut integral bending structure, and the four transition corners at the four-sided rabbet ends adopt a non-cut closed structure.

[0135] A manufacturing method of a corner sandwich panel includes:

[0136] S1. Cut notches on the outer skin steel plate, and use roll pressing or bending on both sides of the steel coil to form rabbets, forming an outer curled edge 120a and an inner curled edge 120b, obtaining a notch 410, and getting a semi-finished workpiece 400 to be bent;

[0137] S2. Transport the semi-finished workpiece 400 to the corner plate forming equipment; wherein, the corner plate forming equipment includes a frame 7 and the following arranged on the frame 7:

[0138] A fixed pressure material assembly 1, including a fixed base blade 11, a first pressure material knife 12 is arranged on the fixed base blade 11, and first core lifting folding knives 13 are located on the transverse two sides of the first pressure material knife 12; wherein, a folding knife female die 131 is arranged on the first core lifting folding knife 13;

[0139] A flap folding assembly 2, arranged on the longitudinal one side of the fixed pressure material assembly 1, including a flap driving device 20 and a flap base blade 21, the flap driving device 20 can drive the flap base blade 21 to flip relative to the fixed base blade 11, a second pressure material knife 22 is arranged on the flap base blade 21, and second core lifting folding knives 23 are located on the transverse two sides of the second pressure material knife 22; wherein, a folding knife male die 231 is arranged on the second core lifting folding knife 23;

[0140] Two sets of side extrusion and feeding assemblies 3 are respectively located on the two transverse sides of the fixed base blade 11. Each side extrusion and feeding assembly 3 includes a side top blade 31;

[0141] A first side die assembly 5 and a second side die assembly 6. The first side die assembly 5 includes outer punch dies 51 symmetrically arranged along the transverse direction on both sides of the fixed base blade 11 and capable of moving transversely (driven by a first oil cylinder 52 in cooperation with a slide rail);

[0142] The second side die assembly 6 includes pressure - feeding side blades 61 symmetrically arranged along the transverse direction on both sides of the flap base blade 21 and capable of moving transversely (driven by a second oil cylinder in cooperation with a slide rail 62). The pressure - feeding side blades 61 can flip synchronously with the flap base blade 21;

[0143] S3. Start the first pressure - feeding blade 12, the first hanging - core folding blade 13, the folding - blade female die 131, and follow the first pressure - feeding blade 12 to clamp the semi - finished workpiece 400. Start the second pressure - feeding blade 22, the second hanging - core folding blade 23, and the hanging - core folding - blade male die 231 to follow and clamp the semi - finished workpiece 400. Start the first side die assembly 5 and the second side die assembly 6. The outer punch die 51 cooperates with the folding - blade female die 131 to clamp the to - be - bent vertical edge 420 of the semi - finished workpiece 400, and form the overlapping lower - plate settlement step 110a;

[0144] S4. Start the two sets of side extrusion and feeding assemblies 3. The two side top blades 31 respectively top at the middle position of the to - be - bent vertical edge 420, forcing the transfer material of the to - be - bent vertical edge 420 to transfer towards the center of the corner during the bending process. The flap bending assembly 2 flips, and the side top blades 31 remain pressed at the middle position of the transferred material; Refer to Figure 38 、 Figure 39 shown;

[0145] S5. Before the critical point where the folding - blade female die 131 and the outer punch die 51 cooperating with it and the folding - blade male die 231 respectively collide with the side top blades 31, the two side top blades 31 withdraw from the bending area. The flip - folding assembly continues to flip. When the transfer material of the remaining to - be - bent vertical edge 420 is pushed to the cavity entrance of the folding - blade female die 131 by the folding - blade male die 231, the flip - folding assembly 2 stops flipping; Refer to Figure 40 、 Figure 41 shown;

[0146] S6. At this time, the folding bending punch 231 and the folding bending die 131 have not come into contact yet. The outer punch 51 retracts, and the flat mouth outer die 132 is filled at the step of the outer punch 51, so that the flat mouth outer die 132 and the outer punch 51 form a plane. The outer punch 51 closes and forms a cavity 133 with the step that has been formed in the transition connection structure 110a in the S3 step of the outer skin plate 100. The flap bending assembly 2 starts to continue flipping. When the folding bending punch 231 enters the cavity 133 with the strip material, starting from when the side punch 31 on the side of step S5 exits the bending area, it is in an air bending state until the folding bending punch 231 closes, and the transition connection structure 110b cannot be formed. Through the folding bending punch 231, the sheet material is forced into the cavity 133 to form the transition connection structure 110b;

[0147] S7. Bend to the predetermined angle to form the bent outer skin plate 100. The first blank holding knife 12 remains pressed, the second blank holding knife 22 retracts to a height higher than the bent edge of the outer skin plate 100, and all the other tools are reset. Finally, the first blank holding knife 12 is released, and the outer skin plate 100 is taken out;

[0148] S8. Apply glue to the bent outer skin plate 100, and put the outer skin plate 100, the core material 300, and the inner skin plate 200 into the V-shaped mold 8 for combined pressing and curing to form the corner sandwich panel. The V-shaped mold 8 includes a mutually cooperating V-shaped upper mold 81 and a V-shaped lower mold 82, as shown in Figure 44 shown.

[0149] Specifically, when the semi-finished workpiece 400 to be bent enters the corner plate forming equipment, the inner positioning method of passing through the inner sides of the first hanging core folding bending knife 13 and the second hanging core folding bending knife 23 or the outer positioning method of positioning by setting the outer positioning device 42 is adopted.

[0150] Specifically, as shown in Figures 30 to 33As shown; the first core-hanging bending knife 13 and the first press knife 12, and the second core-hanging bending knife 23 and the second press knife 22 are matched by inclined sliding. When the semi-finished workpiece 400 has an inner curling edge 120b, before starting to press, the first core-hanging bending knife 13 and the second core-hanging bending knife 23 can smoothly enter the inner curling edge 120b. The core-hanging bending knife has two structures to enter the semi-closed inner curling edge 120b cavity. The first is that the core-hanging bending knife is precisely moved into place by servo drive, and a tiny gap is left with the workpiece being pressed, which can ensure that the workpiece being bent can be transitionally matched and passed. After the workpiece is in place, the press knife is locked. The second method is to use an inclined slider to slide the knife sideways. This method is that the side edges of the core-hanging bending knife and the press knife are provided with The guide rail slider and the core bending knife slide relative to the pressure knife. At the beginning, the core bending knife relies on its own weight and auxiliary lateral force, and the slider falls to the lowest position. Since the guide rail is an inner eight-shaped structure, the width of the core bending knife is the smallest at this time, and it can fall on the outer skin plate 100 without interfering with the inner curling edge 120b of the semi-finished workpiece 400. When the pressure knife continues to descend, the bottom surface of the core bending knife resists the semi-finished workpiece 400. Due to the effect of the inclined guide rail, the core bending knife can only move and open laterally, and slide from the inside to the cavity of the inner curling edge 120b. When exiting, it is a completely reverse path.

[0151] Figure 30 As can be seen from the middle figure, the outer dimension L1 of the two first core bending knives 13 is smaller than the inner dimension L2 of the workpiece, so that when the first pressing knife 12 starts to descend, the first core bending knife 13 first contacts the bottom plane of the workpiece, and as the first pressing knife 12 continues to descend, the first core bending knife 13 expands to both sides under the action of the inclined slider, and when the first pressing knife 12 is in place, the first core bending knife 13 also expands into place, and the first core bending knife 13 is against the side and bottom of the workpiece, and the pressing is completed. The second pressing drive device 25 (drive cylinder) is started, and the second core bending knife 23 is fixed against the inner curling edge 120b in the same way.

[0152] Specifically, refer to Figures 28 to 30 As shown, the side extrusion material guiding assembly 3 also includes a gear box reduction device 32 and a material ejection driving device 33;

[0153] The flap base blade 21 is provided with a flap rotating shaft 28, the outer side of the blade edge of the flap base blade 21 is flipped at the center of the central axis of the flap rotating shaft 28, and the outer side of the blade edge of the flap base blade 21 and the central axis of the flap rotating shaft 28 are separated by the thickness of the bent plate;

[0154] The input end of the gearbox reduction device 32 is connected to the flap rotating shaft 28, and the output end is connected to a rotating shaft 34. The blanking driving device 33 is installed on the rotating shaft 34, and its driving end is connected to the side blanking knife 31 through a tool rod 35. The tool rod 35 is slidably connected to the rotating shaft 34. The gearbox reduction device 32 can make the rotation speed of the flap rotating shaft 28 twice that of the rotating shaft 34. The rotation center cutting edge of the side blanking knife 31 is always at the center of the angle to be bent of the outer skin plate 100.

[0155] Specifically, referring to Figure 27 As shown, it further includes a first mounting bracket 14 and a second mounting bracket 24 that are respectively inclined and arranged on the horizontal plane of the frame 7. A first blanking driving device 15 and a first tool rest 16 are arranged on the first mounting bracket 14. A second blanking driving device 25 and a second tool rest 26 are arranged on the second mounting bracket 24. The first blanking knife 12 and the first core-hanging folding knife 13 are installed on the first tool rest 16. The second blanking knife 22 and the second core-hanging folding knife 23 are installed on the second tool rest 26. The first tool rest 16 and the second tool rest 26 are correspondingly (through a slide rail pair) slidably connected to the first mounting bracket 14 and the second mounting bracket 24. The first blanking driving device 15 drives the first tool rest 16 to slide along the first mounting bracket 14. The second blanking driving device 25 drives the second tool rest 26 to slide along the second mounting bracket 24.

[0156] Exemplarily, both the first blanking driving device 15 and the second blanking driving device 25 include at least one servo cylinder, and a mechanical servo cylinder or a hydraulic servo cylinder can be used.

[0157] Further, the flap driving device 20 determines the flipping angle of the flap base blade 21. When the servo cylinder is in the reset state, the second blanking knife 22 and the second core-hanging folding knife 23 remain in the horizontal starting position. During bending, the second blanking knife 22 and the second core-hanging folding knife 23 are flipped. The flap driving device 20 includes a mechanical servo cylinder or a hydraulic servo cylinder to ensure precise control of the bending angle to meet the forming requirements of outer skin plates 100 of different specifications.

[0158] Specifically, referring to Figure 27 As shown, the flap bending assembly 2 further includes a positioning and blanking knife assembly 27. The second mounting bracket 24 is slidably connected to the flap base blade 21;

[0159] The positioning and blanking knife assembly 27 includes a blanking driving cylinder 271. The driving end of the blanking driving cylinder 271 is connected to the second mounting bracket 24. The stroke of the blanking driving cylinder 271 is higher than the height of the vertical side of the outer skin plate 100 that is flipped and bent.

[0160] Specifically, a feeding component 4 is further provided on the frame 7, and the feeding component 4 is docked to the fixed base blade 11.

[0161] Exemplarily, with reference to Figure 25 As shown, the feeding component 4 includes a transmission rubber roller arranged on the plane of the frame 7 for conveying the outer skin plate 100 workpiece; a reference surface is provided on the side of the frame 7, and the outer positioning device 42 includes an adjustable side guide roller group 41 arranged on both sides of the transmission rubber roller in the transverse direction. The side guide roller group 41 is installed on an adjustment slider, and the adjustment slider is parallel to the side reference surface in the longitudinal direction. The adjustment slider can move transversely through the cooperation of a lead screw and a linear guide rail, so as to adapt to outer skin plates 100 of different widths. Through the adjustment of the above reference and the side guide roller group 41, the positioning and conveying of the workpiece can be completed.

[0162] Specifically, after the tool presses the workpiece, the flap base blade 21 rotates with the central axis of the flap rotating shaft 28 as the center of the circle. The theoretical tip point of the flap base blade 21 coincides with the center point of the flap rotating shaft 28. Actually, a plate thickness is cut off from the tip point.

[0163] Specifically, during the bending process of the outer skin plate 100, the side pressing knife 31 is always located between the first hanging core folding knife 13 and the second hanging core folding knife 23 to perform extrusion and guiding, so that the rabbet edge bending angle of the outer skin plate 100 forms a folded structure with a triangular opening. The extrusion amount of the side pressing knife 31 reaches an irreversible opening triangle that has been plastically deformed. Before the side pressing knife 31 withdraws, the first hanging core folding knife 13 and the second hanging core folding knife 23 keep the triangle folding inward until it closes in the open bending state.

[0164] Both the first hanging core folding knife 13 and the second hanging core folding knife 23 include a bending bottom knife and a bending back knife, and the two are arranged at an angle. The bottom surface of the folding knife is used to press the surface of the outer skin plate 100. The adjacent two folding knife backs clamp the folding structure in the full knife pressing and open bending states. The sum of the angles between the bending bottom knives and the bending back knives of the first hanging core folding knife 13 and the second hanging core folding knife 23 respectively is equal to the required corner angle of the workpiece.

[0165] Specifically, the side pressing knife 31 has a symmetric wedge-shaped structure (refer to Figure 41 As shown), specifically, on the premise that the strength of the tool tip permits, the thinner the better, so as to increase the angle of full knife pressing and reduce the open bending angle, and the end is provided with an R fillet.

[0166] In addition, for workpieces with different bending angles (such as obtuse angles greater than 90°, right angles equal to 90°, and acute angles less than 90°), the required angles of the core-lifting folding knives are different. Therefore, a modular replacement structure can be adopted. Different specifications of core-lifting folding knives can be combined and fixed with screws and positioning pins to ensure precise assembly and convenient disassembly and replacement to meet the requirements of various bending angles.

[0167] Implementation Case 1: Double-sided tongue-and-groove, combined waterproofing at a 90° corner for structure and materials, outer rolled edge 120a + outer rolled edge 120a corner outer skin plate (pneumatic feeding)

[0168] The vertical edge height of the semi-finished workpiece 400 is 40 mm, and the steel plate thickness is 0.7 mm. The pre-cut semi-finished workpiece 400 enters the corner plate forming equipment through the feeding component 4 and is positioned in the longitudinal direction. The first pressure knife 12 drives the first core-lifting folding knives 13 on both sides to start pressing the semi-finished workpiece 400. The second pressure driving device 25 and the stripping driving cylinder 271 move into position. The second pressure knife 22 and the second core-lifting folding knives 23 on both sides press the workpiece. The second side die assembly 6 and the second oil cylinder 62 start to press the side vertical edge. The first side die assembly 5 and the first oil cylinder 52 start. The outer punch 51 is arranged on the outer side of the vertical surface of the workpiece to be bent. The outer punch 51 punches and cooperates with the folding knife die 131 to pre-press the settlement step of the lower plate on the side. When the turning plate folding assembly 2 turns over, the outer punch 51 presses the workpiece, and the side top knife 31 starts. At this time, a total of 14 knives, namely the fixed base knife 11, the first pressure knife 12, the first core-lifting folding knife 13, the first side die assembly 5, the second side die assembly 6, the turning plate base blade 21, the second pressure knife 22, the second core-lifting folding knife 23, and the side top knife 31, are simultaneously pressed in place. The first side die assembly 5 has been pressurized to form the waterproof step 110a on the side. Since the second core-lifting folding knife 23 is equipped with a folding knife punch 231, the highest point of the folding knife punch 231 is 6 mm, corresponding to 8.5 degrees. In this way, the side top knife 31 has to avoid the folding knife punch 231 by a distance of 6 mm. The starting point of the folding knife punch is 6 mm higher and occupies 8.5 degrees. The actual angle of the protruding part of the side folding knife punch becomes 171.5°. This 171.5° will interfere with the side top knife 31 during the bending process, and the side top knife 31 has to withdraw in advance to avoid it. The included angle between the fixed base blade and the turning plate 1 base blade is 180°. The original vertex of the extrusion head of the side top knife 31 is adjusted to be set at the center of 171.5°, which is equal to the position of 85.75 degrees. Setting the original point of the side top knife at the center point of 171.5° can minimize the interference with the bending punch. The turning plate driving device 20 starts. When the turning plate base blade 21 turns 10°, the included angle between the turning plate base blade 21 and the fixed base blade 11 is 170°. The angle between the second core-lifting folding knife punch 231 and the folding knife die 131 is 161.5° at the corner.

[0169] At this time, due to the gearbox reduction device 32, the flipping speed of the side top cutter 31 is half of the flipping speed of the flap base blade 21. The side top cutter 31 actually flips over 5°. The original 85.75° minus 5° becomes 80.75°, which is exactly at the center position of 161.5°. The feeding head of the side top cutter 31 is forced to press against the bent edge by the driving cylinder, and the side vertical edge is always tightly pressed by the pneumatic driving cylinder. The feeding principle at this time is that the air pressure is greater than the yield strength of the material, but it will not crack the material, forcing the material to always adhere to the outer corner point of the inner and outer knives. As the angle gradually increases, the transferred material will increase. At this time, all the knives are fully utilized to press and fold the workpiece. As the angle of the flipping knife becomes larger and larger, the excess material on the vertical edge is transferred from the X direction to the Y direction, forming an inward triangle (refer to Figure 3 as shown). At the same time, the bending die punch 230 is already wrapped with a steel plate material, laying the foundation for forming the overlapping upper plate convex tongue 110b. As the flipping angle increases, the transition connection structure 110 is gradually formed.

[0170] The flap base blade 21 continues to flip. When the flap base blade 21 flips to 71.5°, the included angle between the bending female die 131 and the bending male die 231 is 100°. The side top knife 31 rotates 35.75°. The original position is 85.75°. Subtracting 35.75°, there are still 50° left, which is exactly in the middle of 100°. At this time, the distance between the side top knife 31 and both sides of the two core lifting folding knives is 1 mm. The side top knife 31 retracts to avoid interference. The inner triangular folding structure continues to be bent and folded in an air-bending state under the action of the first core lifting folding knife 13 and the second core lifting folding knife 23. When flipping to the point where the highest point of the folding knife male die 231 is almost close to the folding knife female die 131, the flap bending assembly 2 stops the flipping action; at this time, the folding knife male die 231 and the folding knife female die 131 have not contacted yet. The outer male die 51 retracts, and a flat mouth outer die 132 is filled at the step of the outer male die 51, so that the flat mouth outer die 132 and the outer male die 51 form a plane. The outer male die 51 closes and forms a cavity 133 with the step already formed in the transition connection structure 110a of the outer skin plate 100 in step S3. The flap bending assembly 2 starts to flip again. When the folding knife male die 231 enters the cavity 133 with the strip material, starting from the side top knife 31 retracting from the bending area in step S5, it is in an air-bending state until the folding knife male die 231 closes and cannot form the transition connection structure 110b. Through the folding knife male die 231, the sheet material is forced into the cavity 133 to form the transition connection structure 110b; the overlapping lower plate settlement step 110a adheres to the inside of the cavity 133, and finally flips to 90° to be completely closed. The folding knife female die 131 on the first core lifting folding knife 13 and the folding knife male die 231 on the second core lifting folding knife 23 form a mold closure. The sheet material wrapped by the folding knife male die 231 forms a staggered overlapping structure for waterproofing. The included angles between the bending bottom knife and the bending back knife of the first core lifting folding knife 13 and the second core lifting folding knife 23 are both 45°. Adding the two 45° together, finally the inner knife closes at 90°.

[0171] After the workpiece is completed, the release path of its tool is as follows: First, release the second blank holding knife 22, and then release the second side die assembly 6; Subsequently, the stripping drive cylinder 271 drives the second mounting bracket 24 to slide along the flap base blade 21, so that the second blank holding knife 22 completely exits the height range of the workpiece; the flap base blade 21 resets; release the first side die assembly 5; finally, release the first blank holding knife 12 and take out the workpiece.

[0172] Implementation case 2: Four-sided tongue-and-groove corner, material waterproofing, 100-degree corner, outer roll + inner roll edge 120b corner outer skin plate (servo feed)

[0173] On both sides of the semi-finished workpiece 400 at the bent parts, waterproof diaphragms 130 are pasted and bonded with glue. After the glue cures, the workpiece enters the corner bending machine. Since the workpiece has an inner curled edge 120b structure, in this case, the first core-lifting folding cutter 13 and the second core-lifting folding cutter 23 are first positioned. The inner curled edge of the semi-finished workpiece 400 passes through the inside of the core-lifting bending blade for positioning. There is a gap of 0.05 to 1 mm between the semi-finished workpiece 400 and the pre-positioned core-lifting folding cutter. The inner curled edge cavity of the workpiece 120b passes through the first core-lifting folding cutter 13 and the second core-lifting folding cutter 23, so that the first core-lifting folding cutter 13 and the second core-lifting folding cutter 23 are located in the middle of the inner curled edge 120b cavity. Through the positioning of the longitudinal end, the bending line of the workpiece coincides with the flipping center. The first pressure blade 12 drives the first core-lifting folding cutters 13 on both sides to start and press and fix the workpiece. At this time, the second core-lifting folding cutter 23 and the first pressure blade 12 are at most 1 mm away from the workpiece respectively, so the movement of the pressure blade is 1 mm. At the same time, the first side die assembly 5 starts to press the flipped side vertical edge, the second pressure driving device 25 starts, and the positioning and blanking cutter assembly 27 moves in place in advance before the workpiece is fed. The second pressure blade 22 and the second core-lifting folding cutters 23 on both sides press the workpiece. Since the second pressure blade 22 and the second core-lifting folding cutter 23 are at most 1 mm away from the workpiece respectively, the movement amount is very small. At this time, the second side die assembly 6 starts to press the flipped side vertical surface of the workpiece, and the side top cutter 31 starts. At this time, a total of 14 knives including the fixed base cutter 11, the first pressure blade 12, the first core-lifting folding cutter 13, the first side die assembly 5, the second side die assembly 6, the flap base blade 21, the second pressure blade 22, the second core-lifting folding cutter 23, and the side top cutter 31 are simultaneously pressed in place, and the vertex of the side top cutter 31 is aligned with the center of the angle to be bent.

[0174] The side top cutter 31 is at the 90° position, the flap base blade 21 is at the 180° position, and the flap driving device 20 starts. When the flap base blade 21 flips 20°, the tongue-and-groove plate becomes a 160° corner.

[0175] At this time, due to the gearbox reduction device 32, the flipping speed of the side top cutter 31 is half of the flipping speed of the flap base blade 21. The side top cutter 31 actually flips over by 10°. The original 90° minus 10° becomes 80°, which is exactly at the center position of 160°. The feeding head of the side top cutter 31 presses against the bending edge through the servo drive cylinder and bends it inward into the plate. The feeding principle at this time is through servo drive feeding, and the feeding amount and flipping angle are fully coordinated, so that the material is always forced to adhere to the corner points of the inner and outer knives. As the angle gradually increases, the excess material will increase. At this time, all the knives come into play and fully press the workpiece. As the angle of the flipping knife becomes larger and larger, the excess material on the vertical edge is transferred from the X direction to the Y axis direction, forming an inward triangle. As the flipping angle increases, the triangle gradually takes shape. At this time, the original waterproof membrane 130 attached to the side is folded into the inner cavity of the triangle, forming an internal sealed structure for waterproofing.

[0176] The extrusion amount of the side top cutter 31 and the feeding amount of the servo drive motor for different bending angles of the outer skin plate 100 are as follows:

[0177] When the rabbet edge height of the outer skin plate 100 is 40 mm and the flap bending assembly 2 rotates by 15°, the side top cutter 31 of the side extrusion and feeding assembly 3 rotates by 7.5°, and the theoretical depth of the side top cutter 31 extruding the rabbet edge is 14.6 mm.

[0178] When the rabbet edge height of the outer skin plate 100 is 40 mm and the flap bending assembly 2 rotates by 30°, the side extrusion and feeding assembly 3 rotates by 15°, and the theoretical depth of the side top cutter 31 extruding the rabbet edge of the rabbet plate is 20.1 mm.

[0179] When the rabbet edge height of the outer skin plate 100 is 40 mm and the flap bending assembly 22 rotates by 45°, the side top cutter 31 of the side extrusion and feeding assembly 33 rotates by 22.5°, and the theoretical depth of the side top cutter 3131 extruding the rabbet edge 220 is 22.2 mm.

[0180] When the rabbet edge height of the outer skin plate 100 is 40 mm and the flap bending assembly 2 rotates by 60°, the side top cutter 31 of the side extrusion and feeding assembly 3 rotates by 30°, and the theoretical depth of the side top cutter 31 extruding the rabbet edge is 22.9 mm;

[0181] When the rabbet edge height of the outer skin plate 100 is 40 mm and the flap bending assembly 2 rotates by 75°, the side top cutter 31 of the side extrusion and feeding assembly 3 rotates by 37.5°, and the theoretical depth of the side top cutter 31 extruding the rabbet edge is 23.4 mm.

[0182] The flap base blade 21 continues to flip. When the flap base blade 21 flips to 70°, at this time the included angle of the corner plate is 110°, the side top blade 31 rotates 35°. The original position is 90°, subtracting 35°, there is still 55° left, which is exactly in the middle of 110°. At this time, the side top blade 31 retracts, and the folding structure of the inner triangle continues to flip and bend in an air-bending state under the action of the first core-lifting folding cutter 13 and the second core-lifting folding cutter 23, and finally flips to 100° to be completely closed. The included angle between the bending bottom blade and the bending back blade of the first core-lifting folding cutter 13 and the second core-lifting folding cutter 23 is 50°. Adding the two 50° together, finally the inner blade closes at 100°. In this way, the angle of the outer corner is exactly 100°, completing the forming of the corner plate.

[0183] After the workpiece is completed, the loosening path of its tool is as follows: First, loosen the second pressure blade 22, and then loosen the second side die assembly 6; Subsequently, the stripping drive cylinder 271 drives the second mounting bracket 24 to slide along the flap base blade 21, so that the second pressure blade 22 and the second core-lifting folding cutter 23 are withdrawn longitudinally along the finished plate until they completely exit the height range of the workpiece; The flap base blade 21 resets; Loosen the first side die assembly 5; Finally, loosen the first pressure blade 12 by 1 mm, and the workpiece is translated and taken out.

[0184] Refer to Figure 24 As shown, the two ends of the outer skin plate of the four-sided tongue-and-groove sandwich panel 600 need to fold the waterproof edges 610 and the four edge-sealing and corner-trimming edges 620. After the corner workpiece is bent, the waterproof edge 610 folded together with the closed corner is completed on the end bender.

[0185] Implementation Case 3: 90-degree Corner Sandwich Panel Implementation Case

[0186] At the corner bending of the surface skin flat plate, pre-cut notches 410 in advance to form notches 410 on the inner curled edge 120b and the outer curled edge 120a (refer to Figures 4 to 7 As shown). When cutting the notches 410, except for retaining the vertical edge 420 to be bent, all the excess sheet materials that will interfere during the bending process should be cut off to prevent material interference during the bending process and inability to form. Before starting the bending, the excess materials on the vertical edge 420 to be bent are fed and tightened by the synchronous outer side top blade 31 during bending to make the excess materials on the vertical edge 420 to be bent move inwards. When the inner clamping blade of the corner equipment reaches 90 degrees of the folding cutter, it just clamps the sheet materials transferred to the inside to form a closed triangle, and the waterproof film 130 pasted on the outside is all bent to the inside.

[0187] The combination of the inner skin plate 200, the core material 300 and the outer skin plate 100 uses a four-column hydraulic press with a 90-degree V-shaped mold 8. The inside of the mold is heated. The production sequence is as follows: place the core material 300 and the outer skin plate 100 that have been coated with glue. The glue is applied to the back of the outer skin plate 100, or at the same time, waterproof glue is also injected into the intermediate corner triangular transition inner cavity. When placing the core material 300, all the core materials 300 on the left, right, front and back are engaged. Finally, place the inner skin plate 200 that has been coated with glue. After positioning left and right, the press is closed. After 3 minutes of heating, the corner plate is firmly bonded. In this way, the beat time of the corner plate is one piece in 3 minutes, and 20 corner sandwich panels can be produced in one hour.

[0188] Implementation Case 4: Implementation Case of 90-degree Corner Plate Material Sealing

[0189] At the corner bending of the surface layer outer skin flat plate, a pre-cut notch 410 is made in advance to form notches 410 on the inner curling edge 120b and the outer curling edge 120a (refer to Figures 4 to 7 as shown). When cutting the notch 410, except for retaining the bending edge, all the excess sheet materials that will interfere during the bending process should be cut off to prevent material interference during the bending process and inability to form. Before starting the bending, a triangular waterproof film 130 is pre-pasted at the inner unfolded position corresponding to the transition connection structure 110 (i.e., the position where the bending transition connection structure 110 is formed). The thickness of the triangular waterproof film 130 is 0.5 mm to 2 mm, and the hardness of the triangular waterproof film 130 is 40 degrees to 60 degrees. The film needs to be bonded to the steel plate in advance, and bending can only start after the bonding is firm. When the excess material on the bending vertical edge 420 is fed and tightened by the synchronous outer top knife 31 during bending, the excess material on the bending vertical edge 420 is moved inward. When the inner clamping knife of the corner device is at 80 degrees of the bending knife, the sheet material transferred to the inner side is just clamped to form a closed triangle, and the waterproof film 130 pasted on the outside is all bent to the inner side.

[0190] The combination of the inner skin plate 200, the core material 300 and the outer skin plate 100 uses a four-column hydraulic press with a 90-degree V-shaped mold 8. The inside of the mold is heated. The production sequence is as follows: place the outer skin plate 100 that has been coated with glue. The glue is applied to the back of the outer skin plate 100, and at the same time, waterproof glue is also injected into the intermediate corner triangular transition inner cavity. When placing the core material 300, all the core materials 300 on the left, right, front and back are engaged. Finally, place the inner skin plate 200 that has been coated with glue. After positioning left and right, the press is closed. After 3 minutes of heating, the corner plate is firmly bonded. In this way, the beat time of the corner plate is one piece in 3 minutes, and 20 corner sandwich panels can be produced in one hour.

[0191] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solutions of the present invention rather than to limit them. Although the present invention has been described in detail with reference to the examples, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention.

Claims

1. A corner sandwich panel, comprising an outer skin panel (100), a core material (300) and an inner skin panel (200) formed by bonding, wherein the core material (300) is arranged between the outer skin panel (100) and the inner skin panel (200), characterized in that: The outer skin plate (100) is provided with a bending transition connection structure (110) formed by bending without cutting at a corner position, and during the bending process, the sheet material of the bending transition connection structure (110) is transferred to the inner side of the outer skin plate (100) after the corner.

2. A corner sandwich panel according to claim 1, characterized in that: The bending transition connection structure (110) is provided with material waterproofing and / or structural waterproofing. When the bending transition connection structure (110) is provided with material waterproofing, structural adhesive is injected into the bending transition connection structure (110) during or after bending, or before bending, a waterproof membrane (130) is attached to the vertical edge (420) to be bent of the semi-finished workpiece (400) of the outer skin plate (100).

3. A corner sandwich panel according to claim 2, characterized in that: The bending transition connection structure (110) adopts a high-low offset overlap structure for waterproofing, including an overlapping lower plate settlement step (110a) and an overlapping upper plate boss tongue (110b) that are offset and superimposed to form a waterproof overlap, the depth of the overlapping lower plate settlement step (110a) and the thickness of the overlapping upper plate boss tongue (110b) match, and they overlap each other to form a triangular structure, and the closer to the bending rotation center point of the outer skin plate (100), the smaller the overlap amount, and vice versa.

4. The corner sandwich panel according to claim 1, characterized in that: The maximum perimeter of the outer opening of the structural waterproof geometric shape formed by the bending transition connection structure (110) extending to the inner side is equal to the top length (E) of the bending transition connection structure (110) before bending; the dimensions of the corner waterproof well gap width (A), the corner plate folded arc gap depth (T), and the offset overlap amount (S) are any combination between the maximum and minimum values ​​that meet the requirements of structural waterproofing and molding process dimensions.

5. The corner sandwich panel according to claim 1, characterized in that: The outer skin board (100) has grooves formed on both sides in the width direction, including an outer curling edge (120a) and an inner curling edge (120b), and an overlapping structure (140) formed by overlapping the outer curling edge (120a) and the inner curling edge (120b), or an overlapping structure (140) formed by overlapping the outer curling edge (120a) and the outer curling edge (120a), is formed between two adjacent outer skin boards (100).

6. The corner sandwich panel according to claim 1, characterized in that: The corner sandwich panel comprises a four-sided tongue-and-groove sandwich panel (600) and a two-sided tongue-and-groove sandwich panel structure (500); the inner skin panel (200) adopts a non-cutting integral bending structure.

7. A method for manufacturing a corner sandwich panel according to any one of claims 1 to 6, characterized in that: include: S1, cutting a notch on the outer skin steel plate, rolling or bending the two sides of the steel coil to form a tongue and groove, forming an outer curling edge (120a) and an inner curling edge (120b), obtaining a notch (410), and obtaining a semi-finished workpiece to be bent (400); S2. The semi-finished workpiece (400) to be bent is transported to a corner plate forming device; wherein the corner plate forming device comprises a frame (7) and: A fixed material pressing assembly (1) comprises a fixed base blade (11), wherein the fixed base blade (11) is provided with a first material pressing knife (12) and first core hanging bending knives (13) located on both sides of the first material pressing knife (12); wherein the first core hanging bending knife (13) is provided with a bending knife concave die (131); The flap bending assembly (2) is arranged on one longitudinal side of the fixed pressing assembly (1), and comprises a flap driving device (20) and a flap base blade (21); the flap driving device (20) is capable of driving the flap base blade (21) to flip relative to the fixed base blade (11); the flap base blade (21) is provided with a second pressing knife (22) and second core bending knives (23) located on both lateral sides of the second pressing knife (22); wherein the second core bending knife (23) is provided with a bending knife punch (231); Two sets of side extrusion and material guiding assemblies (3), respectively located on two lateral sides of the fixed base blade (11), each of the side extrusion and material guiding assemblies (3) comprising a side top blade (31); A first side mold assembly (5) and a second side mold assembly (6), wherein the first side mold assembly (5) comprises an outer convex mold (51) which is symmetrically arranged on both sides of the fixed base blade (11) in the transverse direction and is laterally movable; The second side mold assembly (6) comprises material pressing side blades (61) which are symmetrically arranged on both sides of the flap base blade (21) in the transverse direction and are laterally movable, and the material pressing side blades (61) are capable of turning over synchronously with the flap base blade (21); S3, starting the first pressing knife (12), the first hanging core bending knife (13), the bending knife die (131), and the first pressing knife (12) to press the semi-finished workpiece (400), starting the second pressing knife (22), the second hanging core bending knife (23), and the hanging core bending knife punch (231) to press the semi-finished workpiece (400), starting the first side mold assembly (5) and the second side mold assembly (6), and the outer punch (51) cooperates with the bending knife die (131) to press the vertical edge (420) to be bent of the semi-finished workpiece (400), thereby forming a lap lower plate settlement step (110a); S4, the two sets of side extrusion material guiding assemblies (3) are started, and the two side top knives (31) are respectively pressed against the middle position of the vertical edge to be bent (420), forcing the transfer material of the vertical edge to be bent (420) to be transferred to the center of the corner during the bending process, and the flap bending assembly (2) is turned over, and the side top knives (31) are kept pressed against the middle position of the transferred material; S5, the bending knife die (131) and the outer punch (51) and the bending knife punch (231) respectively exit the bending area before the critical point where they collide with the side top knife (31), and the flip bending assembly continues to flip. When the transfer material of the remaining vertical edge (420) to be bent is pushed to the cavity entrance of the bending knife die (131) by the bending knife punch (231), the flap bending assembly (2) stops flipping; S6, at this time, the bending knife punch (231) and the bending knife die (131) are not in contact, the outer punch (51) is withdrawn, and the flat outer mold (132) is filled at the step of the outer punch (51), so that the flat outer mold (132) and the outer punch (51) form a plane, the outer punch (51) is closed and the outer skin plate (100) transition connection structure (110a) formed in step S3 forms a cavity (133), the flap bending assembly (2) starts to continue to flip, and the bending knife punch (231) is in an empty bending state from the time when the side top knife (31) withdraws from the bending area in step S5, and before the bending punch (231) is flipped and closed, and the transition connection structure (110b) cannot be formed. The sheet material is forced into the cavity (133) through the bending punch (231) to form a transition connection structure (110b); S7, bending to a predetermined angle to form a bent outer skin plate (100), the first pressing knife (12) is kept pressed, the second pressing knife (22) is withdrawn to a height higher than the bent edge of the outer skin plate (100), the remaining knives are all reset, and finally the first pressing knife (12) is released to remove the outer skin plate (100); S8, applying glue to the bent outer skin board (100), placing it, the core material (300) and the inner skin board (200) into a V-shaped mold (8), combining them for pressing and curing to form a corner sandwich panel.

8. A corner sandwich panel and a method for manufacturing the same according to claim 7, characterized in that: When the semi-finished workpiece (400) to be bent enters the corner plate forming equipment, an inner positioning method of passing through a first hanging core bending knife (13) and a second hanging core bending knife (23) or an outer positioning method of positioning by providing an outer positioning device (42) is adopted.

9. The method for manufacturing a corner sandwich panel according to claim 7, characterized in that: An inclined slider core-pulling and demoulding structure is used between the first core-hanging bending knife (13) and the first pressing knife (12), and between the second core-hanging bending knife (23) and the second pressing knife (22).

10. The method for manufacturing a corner sandwich panel according to claim 7, characterized in that: The side extrusion material guiding assembly (3) further comprises a gearbox speed reducing device (32) and a material pushing driving device (33); The flap base blade (21) is provided with a flap rotating shaft (28), the outer side surface of the blade edge of the flap base blade (21) is flipped at the center of the central axis of the flap rotating shaft (28), and the outer side of the blade edge of the flap base blade (21) and the central axis of the flap rotating shaft (28) are separated by a thickness of the bent plate; The input end of the gearbox reduction device (32) is connected to the flap shaft (28), and the output end is connected to the rotating shaft (34). The material pushing drive device (33) is installed on the rotating shaft (34) and its driving end is connected to the side top knife (31) through a knife rod (35). The knife rod (35) is slidably connected to the rotating shaft (34). The gearbox reduction device (32) can make the rotation speed of the flap shaft (28) twice the rotation speed of the rotating shaft (34). The rotation center blade of the side top knife (31) is always at the center of the angle to be bent of the outer skin plate (100).

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