An aluminum-plastic back panel forming device and its forming method

Abstract

This invention discloses an aluminum-plastic back panel forming device and method, comprising a clamping mold, a trimming mold, a convex bulge forming mold, and a convex dot punching mechanism. The convex bulge forming mold is located inside the clamping mold, and several convex dot punching mechanisms are distributed in the convex bulge forming mold area. The convex bulge forming mold includes an upper convex bulge forming mold, which is connected to the bottom side of a transition plate via an elastic reset member. The elastic reset member pulls the upper convex bulge forming mold against the bottom side of the transition plate. The convex dot punching mechanism includes a convex dot punch rod, the upper end of which is fixedly connected to a main drive plate. The convex dot punch rod is connected to the upper convex bulge forming mold via a transmission structure, and is used to drive the upper convex bulge forming mold to complete the convex bulge forming after the convex dots are formed. This invention can ensure the stamping performance of the aluminum-plastic back panel structure formed in one stamping process and guarantee the forming quality of the aluminum-plastic back panel.

Description

Technical Field

[0001] This invention relates to the field of aluminum composite panel forming equipment, and in particular to an aluminum composite back panel forming equipment and its forming method. Background Technology

[0002] Aluminum composite panels (ACPs) are lightweight, weather-resistant, and fire-retardant sheet materials composed of two aluminum sheets and a polyethylene plastic layer in between. Due to their excellent surface flatness and decorative properties, they are considered suitable as molding materials for the back panels of large-size displays, reducing the overall weight of the display, ensuring the flatness of the screen, and maintaining the overall appearance quality. However, because the unique structure of ACPs differs from ordinary sheet metal stamping, and display back panels typically have complex structures, ACPs are chosen to be relatively thin and lightweight to ensure heat dissipation. If stamped in one go, over-stamping can easily occur, affecting the molding quality and precision of the ACP back panel. Summary of the Invention

[0003] Purpose of the invention: In order to overcome the shortcomings of the existing technology, the present invention provides an aluminum-plastic back panel forming device and a forming method thereof, which can ensure the stamping performance of the aluminum-plastic back panel structure formed by one stamping and guarantee the forming quality of the aluminum-plastic back panel.

[0004] Technical solution: To achieve the above objectives, the present invention provides an aluminum-plastic back panel forming device and its forming method, comprising a clamping mold, a trimming mold, a convex bulge forming mold, and a convex dot punching mechanism; the clamping mold clamps a straight annular area within the contour of the back panel, the trimming mold is fitted to the outer side of the clamping mold, the convex bulge forming mold is located inside the clamping mold, and a plurality of the convex dot punching mechanisms are distributed in the convex bulge forming mold area;

[0005] The clamping mold includes a support mold and an upper clamping mold. The support mold is fixedly connected to the base plate, the upper clamping mold is fixedly connected to the bottom side of the adapter plate, the adapter plate is spaced apart from the bottom side of the main drive plate and is elastically connected, and the trimming mold is fixedly connected to the bottom side of the main drive plate.

[0006] The convex hull forming mold includes an upper convex hull forming mold and a lower convex hull forming mold. The upper convex hull forming mold is connected to the bottom side of the adapter plate through an elastic reset member. The elastic reset member lifts the upper convex hull forming mold to abut against the bottom side of the adapter plate. The lower convex hull forming mold is located below the upper convex hull forming mold.

[0007] The punching mechanism includes a punch rod and a punching module. The upper end of the punch rod is fixedly connected to the main drive plate. The punching punch of the punching module is telescopically arranged relative to the bottom surface of the punch rod.

[0008] The punch rod for forming the protrusion is connected to the upper die for forming the protrusion through a transmission structure, and is used to drive the upper die for forming the protrusion to complete the protrusion forming after the protrusion is formed.

[0009] Furthermore, the transmission structure includes a mating hole provided in the upper die of the convex bulge forming, the convex punch passing through the mating hole, and a limiting step surface provided in the mating hole, the limiting step surface being used to constrain the length of the lower end of the convex punch extending beyond the lower end face of the upper die of the convex bulge forming.

[0010] Furthermore, the lower die for forming the convex bulge is provided with a die groove aligned with the convex punch, and a punching die corresponding to the punch is provided on the bottom side of the die groove.

[0011] When the protruding punch extends into the die groove, there is a uniform gap between the outer surface of the protruding punch and the die groove. The lower end face contour of the protruding punch and the upper end groove contour of the die groove are both provided with rounded corner structures.

[0012] Furthermore, the convex hull forming mold includes a middle module and an outer module. The middle module is used to form the platform structure in the middle of the convex hull, and the outer module is used to form the annular composite surface structure of the outer ring of the convex hull. The middle module and the outer module cooperate to form the transition slope between the platform structure and the annular composite surface structure, and to form the transition slope between the annular composite surface structure and the flat annular area.

[0013] Furthermore, the limiting step surface within the middle module is higher than the limiting step surface within the outer module; when both the lower mold of the middle module and the lower mold of the outer module are attached to the substrate, the upper mold surface of the lower mold of the middle module is lower than the upper mold surface of the lower mold of the outer module.

[0014] Furthermore, the outer side of the upper mold of the middle module and the inner side of the lower mold of the outer module are spaced apart, and the lower end face contour line of the upper mold of the middle module and the inner ring contour line of the upper end face of the lower mold of the outer module are both provided with rounded corner structures.

[0015] Furthermore, the outer side of the upper mold of the external module is spaced apart from the inner side of the supporting mold, and the lower end face contour line of the upper mold of the external module and the inner ring contour line of the upper end face of the supporting mold are both provided with rounded corner structures.

[0016] Furthermore, the lower end face of the cutting die is flush with the lower end face of the plurality of protruding punches.

[0017] Furthermore, the lower mold for convex bulging is vertically positioned relative to the substrate, and the lower mold of the middle module and the lower mold of the outer module are respectively connected to independent lifting drive devices.

[0018] Furthermore, it includes the following steps:

[0019] Step 1: Position and place the aluminum composite panel material on the support mold. The main drive plate moves down to drive the upper pressure mold to press the flat annular area of ​​the panel material within the outline of the back plate onto the support mold.

[0020] Step II: As the main drive plate continues to move downward, the waste edge is removed by the cooperation of the edge cutting die and the support die, and multiple protrusions are formed simultaneously by multiple protrusion punches.

[0021] Step III: As the main drive plate continues to move down, the corresponding upper mold for forming the convex hull is first moved down by the multiple protrusion punches corresponding to the middle module, and then the corresponding upper mold for forming the convex hull is moved down by the multiple protrusion punches corresponding to the outer module until all the upper molds for forming the convex hull are completely pressed together with the corresponding lower mold for forming the convex hull.

[0022] Step IV: Under the pressure of the convex forming die, the corresponding through hole is formed by punching and shearing on the corresponding convex point using the punching punch.

[0023] Beneficial Effects: The aluminum-plastic back panel forming device and method of the present invention, through mold design, enables the direct forming of the back panel structure from an aluminum-plastic sheet in a single stamping process. Furthermore, during the stamping process, protrusions, bulges, and finally punching are formed sequentially, achieving gradual application of pressure to the sheet material and avoiding over-pressure. It also ensures precise height differences between the end faces of each stepped layer and precise positioning of each through hole relative to the back panel frame, guaranteeing both forming quality and precision. Attached Figure Description

[0024] Figure 1 This is a schematic cross-sectional view of one side of an embodiment of an aluminum-plastic back panel forming device according to the present invention. Detailed Implementation

[0025] The invention will now be further described with reference to the accompanying drawings.

[0026] As attached Figure 1The aforementioned aluminum-plastic back panel forming device and method include a clamping mold 1, a trimming mold 2, a convex hull forming mold 3, and a convex dot punching mechanism 4. The clamping mold 1 clamps a straight annular area within the contour of the back panel. The trimming mold 2 is fitted to the outer side of the clamping mold 1. The convex hull forming mold 3 is located inside the clamping mold 1. Several convex dot punching mechanisms 4 are distributed in the area of ​​the convex hull forming mold 3. The back panel structure formed by this forming device has a complex convex hull structure formed in the middle of the back panel. Several convex dots are distributed on the convex hull structure, and through holes are formed on the convex dots for positioning and installing internal components. Therefore, the punching position on the convex dots has certain precision requirements. The convex dots have different shapes, including boss structures with various contour shapes. The through holes are located on the boss platform, and each convex dot has at least one through hole.

[0027] The clamping die 1 includes a support die 11 and an upper die 12. The support die 11 is fixedly connected to the base plate 5, and the upper die 12 is fixedly connected to the bottom side of the adapter plate 6. The adapter plate 6 is elastically connected to the bottom side of the main drive plate 7 with a distance between them. The trimming die 2 is fixedly connected to the bottom side of the main drive plate 7. Before contacting the aluminum composite panel, the lower end face of the trimming die should be higher than or flush with the lower end face of the upper die, thereby ensuring that during the stamping process, the upper die first presses the panel, and then the trimming die punches down to complete the trimming. The trimming die is directly connected to the main stamping cylinder through the main drive plate to ensure sufficient punching and shearing force at the moment of contact with the panel, thus guaranteeing the trimming quality. The upper pressure mold is elastically connected to the main drive plate via an adapter plate and elastic elements, acting as a buffer. From the moment it contacts the sheet material, the elastic elements gradually compress, slowly increasing the clamping pressure. This ensures sufficient pressure is applied to the sheet material when the trimming die contacts it, without generating instantaneous high pressure upon contact, and without continuously applying excessive pressure before contact. This avoids over-pressure on the sheet material, preventing excessive deformation and ensuring the surface quality of the sheet material and the thickness of the back plate edges are maintained. The upper pressure mold is composed of several pressure block units, with the adapter plate and fixedly connected to these units forming the complete upper pressure mold. The corresponding support mold also consists of multiple support blocks, thus the support mold can also be... Figure 1 The diagram shows a fixed connection between the substrate and the lower adapter plate 51.

[0028] The convex bulge forming mold 3 includes an upper convex bulge forming mold 31 and a lower convex bulge forming mold 32. The upper convex bulge forming mold 31 is connected to the bottom side of the adapter plate 6 through an elastic reset member. The elastic reset member pulls the upper convex bulge forming mold 31 to abut against the bottom side of the adapter plate 6. The lower convex bulge forming mold 32 is located below the upper convex bulge forming mold 31. When the upper convex bulge forming mold is abutting against the adapter plate, the lower end face of the upper convex bulge forming mold is flush with the lower end face of the upper pressure mold 12. This ensures that the upper convex bulge forming mold and the upper pressure mold simultaneously contact the upper side of the sheet material. When the trimming mold cuts the edge of the sheet material downwards, the whole formed by the upper pressure mold and the upper convex bulge forming mold provides reverse support to the middle of the sheet material, so that the pre-formed part in the middle of the aluminum-plastic sheet material is not affected by the trimming and is not deformed.

[0029] The punching mechanism 4 includes a punch rod 41 and a punching module. The upper end of the punch rod 41 is fixedly connected to the main drive plate 7. The punching punch 42 of the punching module is telescopically arranged relative to the bottom surface of the punch rod 41. The punching punch 42 is driven independently by an independent drive module built into the punch rod. When forming the punch, the punch retracts into the punch rod 41. After the punch is formed, the punching is performed, which can ensure the forming quality and accuracy of the punched punch.

[0030] The punch 41 for forming the protrusion is connected to the upper die 31 for forming the convex bulge through a transmission structure. After forming the protrusion, the upper die 31 for forming the convex bulge is driven to complete the convex bulge forming. The transmission structure enables the protrusion and convex bulge to be formed sequentially in one stamping, thereby gradually applying stamping pressure to the sheet metal and avoiding simultaneous forming of the convex bulge and protrusion, which would lead to excessive pressure and poor forming quality.

[0031] The transmission structure includes a mating hole 8 provided in the upper die 31 for forming the convex shape. The convex punch 41 passes through the mating hole 8. A limiting step surface is provided in the mating hole 8. The limiting step surface is used to constrain the length of the lower end of the convex punch 41 extending beyond the lower end face of the upper die 31 for forming the convex shape. Since the upper die 31 for forming the convex shape always maintains a state of contact with the upper side surface of the sheet metal before the stamping action begins, when the lower end of the convex punch extends a certain length beyond the lower end face of the upper die 31 for forming the convex shape, the convex point of the preset convex height is formed. At this time, the middle step surface of the convex punch contacts the limiting step surface in the mating hole 8, so that in the subsequent pressing process, the convex punch and the upper die for forming the convex shape form a whole. Thus, without affecting the already formed convex point, the convex shape structure is further formed, realizing the sequential forming of the convex point and the convex shape, and ensuring the gradual increase of the stamping pressure.

[0032] The lower die 32 for forming the convex bulge is provided with a die groove 321 aligned with the convex punch 41. The bottom side of the die groove 321 is provided with a punching die 322 corresponding to the punching punch 42. When the convex point and the convex bulge are fully formed, the end face of the convex point is in contact with the bottom of the die groove and the end face of the convex bulge is in contact with the upper end face of the lower die 32 for forming the convex bulge. This achieves clamping and fixing of the flat end face areas of the convex point and the convex bulge, ensuring the height difference between the end face of the convex point and the end face of the convex bulge in the convex forming direction. Furthermore, punching on the convex point under this clamping state can avoid the impact of punching on the already formed convex point and boss structure, and can maintain the punching quality and accuracy.

[0033] When the protruding punch 41 extends into the die groove 321, there is a uniform gap between the outer surface of the protruding punch 41 and the die groove 321. The lower end face contour line of the protruding punch 41 and the upper end slot contour line of the die groove 321 are both provided with rounded corner structures. Compared to a fully fitted die, this solution employs a staggered stretching method, creating a uniformly wide transition cone surface around the outer edge of the formed protrusion. This cone surface is not formed by pressing two dies together, but rather by constraining the boundary contour lines between the cone surface and the protrusion end face and the boss end face. During the downward punching process, the rounded corners of the sheet metal against the lower edge contour line of the protrusion punch gradually bend, forming a transition arc surface between the protrusion and the transition cone surface. Simultaneously, the rounded corners of the sheet metal against the upper groove contour line of the die cavity gradually bend in the opposite direction, forming a transition arc surface between the transition cone surface and the boss end face. During this process, the material between the two contour lines is relatively stretched and extended. Finally, upon complete pressing, the sheet metal within the uniform gap straightens to form the final transition cone surface. This solution achieves protrusion forming by constraining the forming height difference between the protrusion end face and the boss end face, as well as the width of the transition cone surface in the back plate plane direction, ensuring the final forming quality and positional accuracy of the protrusion.

[0034] Example: The convex hump forming mold 3 includes a central module 9 and an outer module 10. The central module 9 is used to form the platform structure in the middle of the convex hump, and the outer module 10 is used to form the annular composite surface structure of the outer ring of the convex hump. The central module 9 and the outer module 10 cooperate sequentially to form the transition slope between the platform structure and the annular composite surface structure, and to form the transition slope between the annular composite surface structure and the flat annular area. The convex hump has a complex forming surface. In one embodiment, for a certain type of backplate structure, its convex hump part is divided into a central convex hump end face area and a transition slope connecting the convex hump end face and the flat area of ​​the backplate edge. The transition slope is also connected to the edge of the convex hump end face area and the flat area of ​​the backplate edge by a narrower annular conical surface, thereby ensuring a smooth and continuous transition connection between the surfaces at multiple angles. Furthermore, to meet the layered installation requirements of internal components, a transition step of a certain width is provided on the transition slope surface near the convex end face. The protrusions are mainly distributed on this transition step surface and the convex end face, respectively serving to meet the installation requirements of different internal planar components. Based on this forming structure requirement, the sequential operation of the middle module 9 and the outer module 10 achieves the sequential forming of multi-layered surfaces. This satisfies the need for gradually applying pressure to form complex surfaces, ensuring the forming quality of complex convex surface shapes and avoiding the situation where one-step forming easily leads to excessive pressure on the aluminum composite panel, resulting in excessive deformation or pressure damage.

[0035] Preferably, the limiting step surface within the middle module 9 is higher than the limiting step surface within the outer module 10; when both the lower mold of the middle module 9 and the lower mold of the outer module 10 are attached to the substrate 5, the upper mold surface of the lower mold of the middle module 9 is lower than the upper mold surface of the lower mold of the outer module 10. Since all the protrusion punches 41 are fixedly connected to the main drive plate, all protrusions can be formed synchronously. By setting the limiting step surfaces of the middle module and the outer module with staggered heights, the middle module and the outer module can achieve sequential operation.

[0036] Preferably, the lower end face of the trimming die 2 is flush with the lower end faces of the plurality of protruding punches 41. This allows the forming and trimming of the plurality of protrusions to be completed simultaneously, thereby ensuring uniform stress on the entire sheet and improving the forming quality.

[0037] The lower die 32 for forming the convex bump is vertically positioned relative to the substrate 5. The lower die of the middle module 9 and the lower die of the outer module 10 are respectively connected to independent lifting drive devices. In the initial state, the lower dies of the middle module and the lower module are pushed to a position where their upper surfaces are flush with the upper surfaces of the support mold through their respective lifting drive devices, thereby supporting them on the bottom surface of the plate. They cooperate with the convex punch to form the convex bump first, and then descend synchronously and uniformly until they contact the substrate.

[0038] The outer side of the upper mold of the middle module 9 is spaced apart from the inner side of the lower mold of the outer module 10. Both the lower end face contour of the upper mold of the middle module 9 and the inner ring contour of the upper end face of the lower mold of the outer module 10 have rounded corners. Similarly, the outer side of the upper mold of the outer module 10 is spaced apart from the inner side of the supporting mold 11. Both the lower end face contour of the upper mold of the outer module 10 and the inner ring contour of the upper end face of the supporting mold 11 have rounded corners.

[0039] The narrow annular conical surface used for transition connection between the transition slope and the edge of the convex end face area and the straight edge of the back plate adopts the same forming method as the transition conical surface between the convex end face and the convex end face. By stretching the upper and lower staggered dies against each other, a taut conical surface suspended in the gap of the dies is formed. This does not apply excessive clamping force to the sheet metal. Only the bending area is slowly and gradually pressured, thereby forming the angle between the surfaces and forming a smooth rounded curved surface at the crease, ensuring the accuracy and quality of the forming position.

[0040] Preferably, several air distribution holes are evenly distributed on the substrate inside the support mold to uniformly apply hot air to the bottom surface of the board for overall heating. For thinner aluminum composite panels, this softens them appropriately before forming, reducing their elasticity and making them easier to form by pressing them against the creases. By monitoring the surface temperature of the board in real time, the temperature of the hot air output from the air distribution holes and the downward speed of the main drive plate are controlled to strictly control the temperature of the board during bending and forming, avoiding excessive deformation due to excessive temperature. When the temperature is too high, the downward movement of the main drive plate is temporarily stopped. When the temperature drops to a suitable level, the stamping continues to complete, ensuring the quality of the back panel formed by one stamping of the thin aluminum composite panel.

[0041] The forming method of the above-mentioned aluminum-plastic back panel forming device specifically includes the following steps:

[0042] Step 1: Position and place the aluminum composite panel material on the support mold 11. The main drive plate 7 moves down to drive the upper pressure mold 12 to press the flat annular area of ​​the panel material within the outline of the back plate onto the support mold 11.

[0043] Step II: As the main drive plate 7 continues to move downward, the waste edge is removed by the cooperation of the edge cutting mold 2 and the support mold 11, and at the same time, multiple protrusions are formed simultaneously by multiple protrusion punches 41.

[0044] Step III: As the main drive board 7 continues to move downwards, the lower molds of the middle module 9 and the outer module 10 move downwards synchronously. First, the upper mold 31 corresponding to the convex punches 41 of the middle module 9 moves downwards. At this time, all the convex punches and the upper mold 31 corresponding to the convex punches of the middle module contact the plate. As it moves downwards, a crease is formed on the upper side of the plate at the tangent line connecting the outermost convex punch position, and a crease is formed on the lower side of the plate at the rounded edge of the inner corner of the support mold, until the lower mold of the outer module 10 contacts the substrate. At this time, the outer module 10... The corresponding protruding punches are in contact with the limiting step surface of the upper die for protruding bulge forming. As the main drive plate moves further down, the corresponding upper die for protruding bulge forming 31 is driven to move down through the multiple protruding punches 41 of the external module 10. At the same time, the upper die for protruding bulge forming 31 of the middle module 9 continues to move down until all the upper dies for protruding bulge forming 31 are fully pressed together with the corresponding lower die for protruding bulge forming 32. If the end face of the protruding bulge needs to form a concave rib structure similar to a reinforcing rib, a punch is fixedly connected to the substrate. When fully pressed together, a concave reinforcing rib structure is formed.

[0045] Step IV: Under the pressure of the convex forming die 3, the corresponding through hole is formed by punching and shearing on the corresponding convex point using the punching punch 42.

[0046] Based on the above steps, this solution involves first simultaneously forming multiple protrusions and cutting off waste edges throughout the process. Then, it forms the transition step surface between the transition slope and the protrusion end face, followed by simultaneous forming of the transition slope and the protrusion end face. Pressure is gradually applied throughout the process, ensuring uniform stress on the sheet surface at each step. The formed portions are also clamped and protected to ensure the final quality and precision of the forming process.

[0047] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the above principles of the present invention, and these improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. An aluminum-plastic back panel forming device, characterized in that: It includes a clamping mold (1), a trimming mold (2), a convex hull forming mold (3), and a punching mechanism (4); the clamping mold (1) clamps a straight annular area within the outline of the back plate, the trimming mold (2) is fitted to the outer side of the clamping mold (1), the convex hull forming mold (3) is located inside the clamping mold (1), and several punching mechanisms (4) are distributed in the area of ​​the convex hull forming mold (3); The clamping mold (1) includes a support mold (11) and an upper mold (12). The support mold (11) is fixedly connected to the base plate (5). The upper mold (12) is fixedly connected to the bottom side of the adapter plate (6). The adapter plate (6) is spaced apart from the bottom side of the main drive plate (7) and is elastically connected. The trimming mold (2) is fixedly connected to the bottom side of the main drive plate (7). The convex hull forming mold (3) includes an upper convex hull forming mold (31) and a lower convex hull forming mold (32). The upper convex hull forming mold (31) is connected to the bottom side of the adapter plate (6) through an elastic reset member. The elastic reset member pulls the upper convex hull forming mold (31) to abut against the bottom side of the adapter plate (6). The lower convex hull forming mold (32) is located below the upper convex hull forming mold (31). The punching mechanism (4) includes a punch rod (41) and a punching module. The upper end of the punch rod (41) is fixedly connected to the main drive plate (7). The punching punch (42) of the punching module is telescopically arranged relative to the bottom surface of the punch rod (41). The protrusion punch (41) and the convex hull forming upper die (31) are connected by a transmission structure to drive the convex hull forming upper die (31) to complete the convex hull forming after the protrusion is formed; The convex hull forming mold (3) includes a middle module (9) and an outer module (10). The middle module (9) is used to form the platform structure in the middle of the convex hull, and the outer module (10) is used to form the annular combined surface structure of the outer ring of the convex hull. The middle module (9) and the outer module (10) cooperate to form the transition slope between the platform structure and the annular combined surface structure, and to form the transition slope between the annular combined surface structure and the flat annular area. The transmission structure includes a mating hole (8) provided in the upper mold (31) for forming the convex hull, the convex punch (41) passes through the mating hole (8), and a limiting step surface is provided in the mating hole (8). The limiting step surface is used to constrain the length of the lower end of the convex punch (41) extending out of the lower end face of the upper mold (31) for forming the convex hull. The limiting step surface in the middle module (9) is higher than the limiting step surface in the outer module (10); when the lower mold of the middle module (9) and the lower mold of the outer module (10) are both attached to the substrate (5), the upper mold surface of the lower mold of the middle module (9) is lower than the upper mold surface of the lower mold of the outer module (10).

2. The aluminum-plastic back panel forming device according to claim 1, characterized in that: The lower die (32) for forming the convex bulge is provided with a cavity groove (321) aligned with the convex punch (41), and a punching cavity (322) corresponding to the punching punch (42) is provided on the bottom side of the cavity groove (321). When the protruding punch (41) extends into the cavity groove (321), there is a uniform gap between the outer surface of the protruding punch (41) and the cavity groove (321). The lower end face contour line of the protruding punch (41) and the upper end groove contour line of the cavity groove (321) are both provided with rounded corner structures.

3. The aluminum-plastic back panel forming device according to claim 2, characterized in that: The outer side of the upper mold of the middle module (9) and the inner side of the lower mold of the outer module (10) are spaced apart. The outline of the lower end face of the upper mold of the middle module (9) and the inner ring outline of the upper end face of the lower mold of the outer module (10) are both provided with rounded corner structures.

4. The aluminum-plastic back panel forming device according to claim 3, characterized in that: The outer side of the upper mold of the external module (10) is spaced apart from the inner side of the supporting mold (11). The lower end face contour of the upper mold of the external module (10) and the inner ring contour of the upper end face of the supporting mold (11) are both provided with rounded corner structures.

5. The aluminum-plastic back panel forming device according to claim 4, characterized in that: The lower end face of the cutting die (2) is flush with the lower end face of the plurality of protruding punches (41).

6. The aluminum-plastic back panel forming device according to claim 5, characterized in that: The lower mold (32) for convex bulging is raised and lowered relative to the substrate (5), and the lower mold of the middle module (9) and the lower mold of the outer module (10) are respectively connected to independent lifting drive devices.

7. The forming method of the aluminum-plastic back panel forming device according to any one of claims 1-6, characterized in that, Includes the following steps: Step 1: Position and place the aluminum composite panel material on the support mold (11). The main drive plate (7) moves down to drive the upper pressure mold (12) to press the flat annular area of ​​the panel material within the outline of the back plate onto the support mold (11). Step II: As the main drive plate (7) continues to move down, the waste edge is removed by the cooperation of the edge cutting die (2) and the support die (11), and multiple protrusions are formed simultaneously by multiple protrusion punches (41); Step III: As the main drive plate (7) continues to move down, the corresponding upper mold (31) for forming the convex hull is first moved down by the multiple protrusion punches (41) corresponding to the middle module (9), and then the corresponding upper mold (31) for forming the convex hull is moved down by the multiple protrusion punches (41) corresponding to the outer module (10), until all the upper molds (31) for forming the convex hull are completely pressed together with the corresponding lower mold (32) for forming the convex hull; Step IV: Under the pressure of the convex forming die (3), the corresponding through hole is formed by punching and shearing on the corresponding convex point using the punching punch (42).

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