Aluminum-plastic backboard forming device and forming method thereof

Abstract

The invention discloses an aluminum-plastic back plate forming device and a forming method thereof. The aluminum-plastic back plate forming device comprises a pressing and clamping die, a trimming die, a convex hull forming die and a convex point punching mechanism. The convex hull forming die is located on the inner side of the pressing and clamping die, and the multiple convex point punching mechanisms are distributed in the area of the convex hull forming die. The convex hull forming die comprises an upper convex hull forming die, the upper convex hull forming die is connected with the bottom side face of the adapter plate through an elastic reset piece, and the elastic reset piece lifts the upper convex hull forming die to be attached to the bottom side face of the adapter plate. The salient point punching mechanism comprises a salient point punching rod, and the upper end of the salient point punching rod is fixedly connected with the main driving plate; the convex point punching rod is connected with the convex hull forming upper die in a matched mode through a transmission structure and used for driving the convex hull forming upper die to act to complete convex hull forming after convex points are formed. The stamping performance of the one-time stamping aluminum-plastic plate forming backboard structure can be guaranteed, and the forming quality of an aluminum-plastic backboard is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of aluminum-plastic plate forming devices, in particular to an aluminum-plastic backboard forming device and a forming method thereof. Background Art

[0002] Aluminum-plastic panel is a light, weather-resistant and fire-proof panel, which is composed of two layers of aluminum and a polyethylene plastic layer in the middle. Because it also has excellent surface flatness and decorative properties, it is proposed to be used as a molding material for the back panel of large-size display screens, which can reduce the overall weight of the display screen, ensure the flatness of the display screen, and the overall appearance quality of the display screen. However, due to the unique structure of aluminum-plastic panel and the difference between ordinary plate stamping, and the display back panel is usually formed with a more complex structure, in order to ensure the heat dissipation performance of the display back panel, the aluminum-plastic panel is selected to be relatively light and thin. If it is stamped in place at one time, it is easy to cause over-stamping, affecting the molding quality and precision of the aluminum-plastic back panel. Summary of the invention

[0003] Purpose of the invention: In order to overcome the deficiencies in the prior art, the present invention provides an aluminum-plastic backboard forming device and a forming method thereof, which can ensure the stamping performance of the aluminum-plastic plate forming backboard structure in one stamping and ensure the forming quality of the aluminum-plastic backboard.

[0004] Technical solution: To achieve the above-mentioned purpose, the present invention provides an aluminum-plastic backboard forming device and a forming method thereof, comprising a clamping die, a trimming die, a convex hull forming die and a convex point punching mechanism; the clamping die clamps a straight annular area within the backboard contour, the trimming die is arranged in contact with the outer side of the clamping die, the convex hull forming die is located inside the clamping die, and a plurality of convex point punching mechanisms are distributed in the convex hull forming die area;

[0005] The clamping die comprises a supporting die and an upper die, wherein the supporting die is fixedly connected to the base plate, the upper die 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 elastically connected, and the trimming die is fixedly connected to the bottom side of the main drive plate;

[0006] The convex hull forming die comprises a convex hull forming upper die and a convex hull forming lower die, the convex hull forming upper die is connected to the bottom side of the adapter plate via an elastic reset member, the elastic reset member pulls the convex hull forming upper die to abut against the bottom side of the adapter plate, and the convex hull forming lower die is located below the convex hull forming upper die;

[0007] The convex punching mechanism comprises a convex punch rod and a punching module, wherein the upper end of the convex punch rod is fixedly connected to the main driving plate, and the punching punch of the punching module is telescopically arranged relative to the bottom surface of the convex punch rod;

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

[0009] Furthermore, the transmission structure includes a matching hole arranged on the bulge forming upper die, the bulge punch rod passes through the matching hole, and a limiting step surface is arranged in the matching hole, and the limiting step surface is used to constrain the length of the lower end of the bulge punch rod extending out of the lower end surface of the bulge forming upper die.

[0010] Furthermore, the convex hull forming lower die is provided with a die groove aligned with the convex punch rod, and the bottom side of the die groove is provided with a punching die corresponding to the punching punch;

[0011] When the convex punch extends into the die groove, a uniform gap is left between the outer rod surface of the convex punch and the die groove, and the lower end surface contour line of the convex punch and the upper end notch contour line of the die groove are both provided with rounded corner structures.

[0012] Furthermore, the bulge forming die includes a middle module and an outer module, the middle module is used to form the table structure in the middle of the bulge, and the outer module is used to form the annular combination surface structure of the outer ring of the bulge, and the middle module and the outer module act in sequence to form the transition slope between the table structure and the annular combination surface structure, and to form the transition slope between the annular table structure and the straight annular area.

[0013] Furthermore, the limiting step surface in the middle module is set higher than the limiting step surface in the external module; when the lower mold of the middle module and the lower mold of the external module are both 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 external module.

[0014] Furthermore, the outer side surface of the middle module upper mold and the inner side surface of the outer module lower mold are arranged at a distance, and the lower end surface contour line of the middle module upper mold and the inner ring contour line of the upper end surface of the outer module lower mold are both provided with rounded corner structures.

[0015] Furthermore, the outer side surface of the upper mold of the external mold group and the inner side surface of the supporting mold are arranged at a distance, and the contour line of the lower end surface of the upper mold of the external mold group and the inner ring contour line of the upper end surface of the supporting mold are both provided with rounded corner structures.

[0016] Furthermore, the lower end surface of the trimming die is flush with the lower end surfaces of the plurality of convex punch rods.

[0017] Furthermore, the convex hump forming lower mold is arranged to be lifted 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] Further, the following steps are included:

[0019] Step I, positioning and placing the aluminum-plastic sheet on the support mold, and driving the upper pressing mold to press the flat annular area of ​​the sheet corresponding to the back plate contour on the support mold by moving the main driving plate downward;

[0020] Step II, as the main driving plate continues to move downward, the waste edge is cut off by the trimming die and the supporting die, and multiple convex points are formed synchronously by multiple convex point punches;

[0021] Step III, as the main driving plate continues to move downward, the corresponding convex hull forming upper dies are first driven downward by the multiple convex point punches corresponding to the middle module, and then the corresponding convex hull forming upper dies are driven downward by the multiple convex point punches corresponding to the outer module, until all the convex hull forming upper dies are fully pressed together with the corresponding convex hull forming lower dies;

[0022] Step IV, under the tight state of the convex hull forming die, the corresponding through holes are punched and sheared on the corresponding convex points by means of the punching punch.

[0023] Beneficial effects: The aluminum-plastic backboard forming device and forming method of the present invention can directly form the backboard structure by stamping the aluminum-plastic board once through the mold design, and in the stamping process, the convex points, the convex hulls are formed in sequence, and finally the holes are punched, so as to gradually apply pressure to the board and avoid overpressure on the board. It also ensures that the height difference between the end faces of each step layer is accurate, and the position of each through hole is accurate relative to the position of the backboard frame, which ensures both the molding quality and the molding accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic structural cross-sectional diagram of one side of an embodiment of an aluminum-plastic backboard forming device of the present invention. DETAILED DESCRIPTION

[0025] The present invention will be further described below in conjunction with the accompanying drawings.

[0026] As attached Figure 1The aluminum-plastic back panel forming device and forming method thereof include a clamping die 1, a trimming die 2, a convex hull forming die 3 and a convex point punching mechanism 4; the clamping die 1 clamps the straight annular area within the back panel contour, the trimming die 2 is arranged in contact with the outer side surface of the clamping die 1, the convex hull forming die 3 is located on the inner side of the clamping die 1, and a plurality of convex point punching mechanisms 4 are distributed in the convex hull forming die 3 area; the back panel structure formed by the forming device has a complex convex hull structure formed in the middle of the back panel, and a plurality of convex points are distributed on the convex hull structure, and through holes are formed on the convex points for positioning and installing internal components, so the punching position on the convex point has certain precision requirements, and the convex point forming shapes are different, including boss structures with various contour shapes, and the through holes are located on the boss table, and each convex point has at least one through hole formed on it.

[0027] The clamping die 1 includes a supporting die 11 and an upper die 12. The supporting die 11 is fixedly connected to the base plate 5. The upper die 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 die 2 is fixedly connected to the bottom side of the main drive plate 7. Before contacting the aluminum-plastic sheet, the lower end face of the trimming die should be higher than the lower end face of the upper die, or flush with the lower end face of the upper die, so as to ensure that during the stamping process, the upper die is first pressed against the sheet, and then the trimming die is punched 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 sheet, thereby ensuring the trimming quality. The upper die is elastically connected to the main drive plate through an adapter plate and an elastic part, which plays a buffering role. From the moment it contacts the plate, the elastic part is gradually compressed, thereby slowly increasing the clamping pressure to ensure that sufficient pressure is applied to the plate when the trimming die contacts the plate, without generating instantaneous strong pressure when the upper die contacts the plate, and no strong pressure is continuously applied before the trimming die contacts the plate, thereby avoiding excessive pressure on the pressure-applying part of the plate to cause excessive deformation, and avoiding affecting the surface quality of the plate and the thickness quality of the edge of the back plate. Among them, the upper die is composed of several block units, and the adapter plate and the fixed connection of multiple block units constitute a complete upper die. The corresponding support die is also composed of multiple support blocks, so the support die can also be like Figure 1 As shown in FIG. , it is fixedly connected to the base plate through the lower adapter plate 51.

[0028] The bulge forming die 3 comprises a bulge forming upper die 31 and a bulge forming lower die 32, wherein the bulge forming upper die 31 is connected to the bottom side of the adapter plate 6 via an elastic reset member, and the elastic reset member pulls the bulge forming upper die 31 to abut against the bottom side of the adapter plate 6, and the bulge forming lower die 32 is located below the bulge forming upper die 31; wherein, when the bulge forming upper die is abutted against the adapter plate, the lower end surface of the bulge forming upper die is flush with the lower end surface of the upper pressure die 12, thereby ensuring that the bulge forming upper die and the upper pressure die contact the upper side surface of the plate at the same time, ensuring that when the trimming die shears the edge of the plate downward, the whole formed by the upper pressure die and the bulge forming upper die plays a reverse supporting role on the middle part of the plate, so that the preformed part in the middle of the aluminum-plastic plate is not affected by the trimming and deformed.

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

[0030] The convex point punch rod 41 is connected with the convex hull forming upper die 31 through a transmission structure, and is used to drive the convex hull forming upper die 31 to move after forming the convex point. The transmission structure is used to realize the sequential forming of the convex point and the convex hull in one punching, so as to gradually apply the punching pressure to the sheet, and avoid the synchronous forming of the convex hull and the convex point, which may cause poor forming quality due to overpressure.

[0031] The transmission structure includes a matching hole 8 provided in the convex hull forming upper die 31, the convex point punch rod 41 passes through the matching hole 8, and a limited step surface is provided in the matching hole 8, and the limited step surface is used to restrict the length of the lower end of the convex point punch rod 41 extending out of the lower end surface of the convex hull forming upper die 31. Since the convex hull forming upper die 31 always maintains a fitting state with the upper side plate surface of the plate before the punching action begins, when the lower end of the convex point punch rod extends out of the lower end surface of the convex hull forming upper die 31 by a certain length, a convex point with a preset convex height is just formed, and at this time, the middle step surface of the convex point punch rod contacts the limited step surface in the matching hole 8, so that in the subsequent pressing process, the convex point punch rod and the convex hull forming upper die form a whole, so that the convex hull structure is further formed without affecting the formed convex point, so that the convex point and the convex hull are formed successively, and the stamping pressure is gradually increased.

[0032] The bulge forming lower die 32 is provided with a die groove 321 aligned with the bulge punch rod 41, and the bottom side of the die groove 321 is provided with a punching die 322 corresponding to the punching punch 42; when the bulge and the bulge are fully formed, the end face of the bulge fits with the bottom of the die groove and the end face of the bulge fits with the upper end face of the bulge forming lower die 32; thereby, the bulge and the bulge are clamped and fixed to the straight end face area, which can ensure the height difference between the end face of the bulge and the end face of the bulge in the bulge forming direction, and punching the bulge in this clamping state can avoid the influence of punching on the formed bulge and boss structure, and can maintain the punching quality and accuracy.

[0033] When the convex punch rod 41 extends into the die groove 321, a uniform gap is left between the outer rod surface of the convex punch rod 41 and the die groove 321, and the lower end surface contour line of the convex punch rod 41 and the upper end notch contour line of the die groove 321 are both provided with rounded corner structures. Compared with the fully fitted concave and convex molds, this scheme adopts the method of staggered stretching, so that the outer circle of the formed convex point is hit by a transition cone surface of uniform width, and this cone surface is not formed by pressing two molds, but only the boundary contour line position between the cone surface and the end face of the convex point and the end face of the boss is constrained, so that during the punching process, the rounded surface of the plate against the edge contour line of the lower end face of the convex point punch rod is gradually bent to form a transition arc surface between the convex point and the transition cone surface. At the same time, the rounded surface of the plate against the contour line of the upper end notch of the concave die groove is gradually bent in the opposite direction to form a transition arc surface between the transition cone surface and the convex hull end face. In this process, the material between the two contour lines is relatively stretched and extended, and finally when fully pressed, the plate located in the uniform gap is straightened to form the final transition cone surface. This scheme realizes the molding of the convex point by constraining the molding height difference between the end face of the convex point and the end face of the convex hull and the width of the transition cone surface in the plane direction of the back plate, ensuring the final molding quality and position accuracy of the convex point.

[0034] Embodiment: The convex hull forming die 3 includes a middle module 9 and an outer module 10, wherein the middle module 9 is used to form a table structure in the middle of the convex hull, and the outer module 10 is used to form an annular combination surface structure of the outer ring of the convex hull. The middle module 9 and the outer module 10 are operated in sequence to form a transition slope between the table structure and the annular combination surface structure, and a transition slope between the annular table structure and the straight annular area. The convex hull has a complex forming profile. In one embodiment, for a certain type of back plate structure, the convex hull portion is divided into a convex hull end face region in the middle, and a transition slope connecting the convex hull end face and the straight area of ​​the back plate edge, and the transition slope is also transitionally connected to the edge of the convex hull end face region and the straight area of ​​the back plate edge through a narrow annular cone, thereby ensuring a smooth and continuous transition connection between profiles at multiple angles. Furthermore, for the layered installation requirements of the internal installation components, the transition slope surface is also provided with a transition step surface of a certain width near the convex end surface area, and the convex points are mainly distributed on the transition step surface and the convex end surface, respectively used to meet the installation requirements of different internal plane components. On the basis of this molding structure requirement, the sequential molding of the multi-layer profile is achieved by the sequential actions of the middle module 9 and the outer module 10, which meets the requirements of gradually applying pressure to the complex profile, ensures the molding quality of the complex profile of the convex hull, and avoids the situation that the aluminum-plastic plate is easily over-pressurized and excessively deformed or pressure-damaged due to one-step molding.

[0035] Preferably, 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 fitted with 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 convex punches 41 are fixedly connected to the main drive plate, all the convex points can be formed synchronously, and the limiting step surfaces of the middle module and the outer module are set at a height offset, so that the middle module and the outer module can be moved in sequence.

[0036] Preferably, the lower end surface of the trimming die 2 is flush with the lower end surfaces of the plurality of convex punches 41. The molding and trimming of the plurality of convex points can be completed simultaneously, thereby ensuring uniform force on the entire sheet material and improving molding quality.

[0037] The convex bulge forming lower die 32 is arranged to be lifted relative to the substrate 5, and the lower die of the middle die set 9 and the lower die of the outer die set 10 are respectively connected to independent lifting drive devices. In the initial state, through their respective lifting drive devices, the lower dies of the middle die set and the lower die set are pushed to a position where the upper end faces are flush with the upper end faces of the supporting die, so as to be supported on the bottom surface of the plate, cooperate with the convex point punch to realize the first forming of the convex point, and then synchronously descend at a uniform speed until they contact with the substrate.

[0038] The outer side surface of the upper mold of the middle mold 9 is set at a distance from the inner side surface of the lower mold of the outer mold 10, and the contour line of the lower end surface of the upper mold of the middle mold 9 and the inner ring contour line of the upper end surface of the lower mold of the outer mold 10 are both provided with a rounded structure. The outer side surface of the upper mold of the outer mold 10 is set at a distance from the inner side surface of the support mold 11, and the contour line of the lower end surface of the upper mold of the outer mold 10 and the inner ring contour line of the upper end surface of the support mold 11 are both provided with a rounded structure.

[0039] The narrower annular conical surface used for transition connection between the transition slope and the convex hull end face area and the edge of the straight area of ​​the back plate edge adopts the same forming method as the transition conical surface between the convex point end face and the convex hull end face. It is stretched by the upper and lower offset dies to form a straight conical surface suspended in the mold gap. It will not apply excessive clamping force to the plate, but only slowly and gradually apply pressure to the bending point, thereby forming an angle between the surfaces and forming a smooth rounded curved surface at the crease, ensuring the molding position accuracy and quality.

[0040] Preferably, a number of air distribution holes are evenly distributed on the substrate on the inner side of the support mold, which are used to evenly apply hot air to the bottom surface of the plate for overall heating. For thinner aluminum-plastic plates, they are appropriately softened before forming to reduce their elasticity, making them easier to form by sticking to the creases. By real-time detection of the plate surface temperature, the temperature of the hot air output by the air distribution holes and the speed of the main drive plate moving downward are controlled, and the temperature of the plate during bending is strictly controlled to avoid excessive deformation due to excessive temperature. When the temperature is high, the downward movement of the main drive plate is temporarily stopped, and when the belt temperature drops to a suitable temperature, the stamping is continued to ensure the quality of the thin aluminum-plastic plate back panel formed by one-time stamping.

[0041] The molding method of the aluminum-plastic backboard molding device specifically comprises the following steps:

[0042] Step I: Position and place the aluminum-plastic sheet on the support mold 11 , and drive the upper pressing mold 12 to press the flat annular area of ​​the sheet corresponding to the back plate contour on the support mold 11 by moving the main driving plate 7 downward.

[0043] Step II, as the main driving plate 7 continues to move downward, the trimming die 2 cooperates with the supporting die 11 to cut off the waste edges, and at the same time, multiple convex points are synchronously formed by multiple convex point punches 41.

[0044] Step III, as the main driving plate 7 continues to move downward, the lower molds of the middle module 9 and the outer module 10 move downward synchronously; first, the corresponding convex hull forming upper mold 31 is driven downward by the multiple convex punches 41 corresponding to the middle module 9, at which time all the convex punches and the convex hull forming upper mold 31 corresponding to the middle module are in contact with the plate, and as it moves downward, a crease is generated on the upper side of the plate at the tangent line connecting the position of the outermost convex punch, and a crease is generated on the lower side of the plate at the inner rounded edge of the supporting mold until the lower mold of the outer module 10 contacts the substrate, at which time the outer module 10 The corresponding convex punch rod just contacts with the limiting step surface of the convex bulge forming upper die; when the main driving plate moves downward further, the corresponding convex bulge forming upper die 31 is driven to move downward through the multiple convex punch rods 41 corresponding to the external module 10, and at the same time, the convex bulge forming upper die 31 corresponding to the middle module 9 continues to move downward until all the convex bulge forming upper dies 31 are completely pressed together with the corresponding convex bulge forming lower die 32; if the convex end face needs to form an inner concave ridge structure similar to a reinforcing rib, the corresponding convex die is fixedly connected on the base plate, and when it is fully pressed together, the inner concave reinforcing ridge structure is formed.

[0045] Step IV, under the compression state of the convex hull forming die 3, the corresponding through holes are punched and sheared on the corresponding convex points by the punching punch 42.

[0046] Based on the above steps, in the whole process, the present solution first forms multiple convex points synchronously and removes the waste edge at the same time, then forms the transition step surface between the transition slope surface and the convex hull end surface, and then synchronously forms the transition slope surface and the convex hull end surface. The whole process gradually applies pressure, and each step of pressure application ensures that the surface of the sheet is evenly stressed, and the formed part is clamped and protected to ensure the quality and accuracy of the final forming.

[0047] The above description is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the above principles of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. An aluminum-plastic backboard forming device, characterized in that: It comprises a clamping die (1), a trimming die (2), a convex hull forming die (3) and a convex point punching mechanism (4); the clamping die (1) clamps a straight annular area within the contour of a back plate, the trimming die (2) is arranged in close contact with the outer side surface of the clamping die (1), the convex hull forming die (3) is located on the inner side of the clamping die (1), and a plurality of convex point punching mechanisms (4) are distributed in the convex hull forming die (3) area; The clamping die (1) comprises a supporting die (11) and an upper die (12), wherein the supporting die (11) is fixedly connected to the base plate (5), the upper die (12) is fixedly connected to the bottom side of the adapter plate (6), the adapter plate (6) and the bottom side of the main drive plate (7) are spaced apart and elastically connected, and the trimming die (2) is fixedly connected to the bottom side of the main drive plate (7); The convex bulge forming die (3) comprises a convex bulge forming upper die (31) and a convex bulge forming lower die (32); the convex bulge forming upper die (31) is connected to the bottom side of the adapter plate (6) via an elastic reset member; the elastic reset member pulls the convex bulge forming upper die (31) to abut against the bottom side of the adapter plate (6); the convex bulge forming lower die (32) is located below the convex bulge forming upper die (31); The convex point punching mechanism (4) comprises a convex point punch rod (41) and a punching module, the upper end of the convex point punch rod (41) is fixedly connected to the main driving plate (7), and the punching punch (42) of the punching module is telescopically arranged relative to the bottom surface of the convex point punch rod (41); The convex point punch rod (41) is connected to the convex hump forming upper die (31) via a transmission structure, and is used to drive the convex hump forming upper die (31) to move and complete the convex hump forming after the convex point is formed.

2. The aluminum-plastic backboard forming device according to claim 1, characterized in that: The transmission structure comprises a matching hole (8) arranged on the convex hump forming upper die (31), the convex point punch rod (41) passes through the matching hole (8), a limiting step surface is arranged in the matching hole (8), and the limiting step surface is used to restrict the length of the lower end of the convex point punch rod (41) extending out of the lower end surface of the convex hump forming upper die (31).

3. The aluminum-plastic backboard forming device according to claim 2, characterized in that: The convex hull forming lower die (32) is provided with a die groove (321) aligned with the convex punch rod (41), and the bottom side of the die groove (321) is provided with a punching die (322) corresponding to the punching punch (42); When the convex punch rod (41) extends into the die groove (321), a uniform gap is left between the outer rod surface of the convex punch rod (41) and the die groove (321), and the lower end surface contour line of the convex punch rod (41) and the upper end notch contour line of the die groove (321) are both provided with rounded corner structures.

4. The aluminum-plastic backboard forming device according to claim 3, characterized in that: The convex hull forming die (3) comprises a middle die set (9) and an outer die set (10), wherein the middle die set (9) is used to form a table structure in the middle of the convex hull, and the outer die set (10) is used to form an annular combination surface structure on the outer ring of the convex hull, and the middle die set (9) and the outer die set (10) are used to cooperate with each other in sequence to form a transition slope between the table structure and the annular combination surface structure, and to form a transition slope between the annular table structure and the straight annular area.

5. The aluminum-plastic backboard forming device according to claim 4, characterized in that: The limiting step surface in the middle module (9) is arranged 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 in contact with 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).

6. The aluminum-plastic backboard forming device according to claim 5, characterized in that: The outer side surface of the upper mold of the middle mold (9) and the inner side surface of the lower mold of the outer mold (10) are arranged at a distance, and the contour line of the lower end surface of the upper mold of the middle mold (9) and the inner ring contour line of the upper end surface of the lower mold of the outer mold (10) are both provided with rounded corner structures.

7. The aluminum-plastic backboard forming device according to claim 6, characterized in that: The outer side surface of the upper mold of the external mold group (10) and the inner side surface of the support mold (11) are arranged at a distance, and the contour line of the lower end surface of the upper mold of the external mold group (10) and the inner ring contour line of the upper end surface of the support mold (11) are both provided with rounded corner structures.

8. The aluminum-plastic backboard forming device according to claim 7, characterized in that: The lower end surface of the trimming die (2) is flush with the lower end surfaces of the plurality of convex punch rods (41).

9. The aluminum-plastic backboard forming device according to claim 8, characterized in that: The convex hump forming lower die (32) is arranged to be lifted relative to the base plate (5), and the lower die of the middle die set (9) and the lower die of the outer die set (10) are respectively connected to independent lifting drive devices.

10. A forming method for an aluminum-plastic backboard forming device according to any one of claims 1 to 9, characterized in that: The following steps are involved: Step I, positioning the aluminum-plastic sheet material on the support mold (11), and driving the upper pressing mold (12) to press the portion of the sheet material corresponding to the straight annular area within the back plate contour on the support mold (11) by moving the main driving plate (7) downward; Step II, as the main driving plate (7) continues to move downward, the trimming die (2) cooperates with the supporting die (11) to cut off the waste edge, and at the same time, multiple convex points are synchronously formed by multiple convex point punches (41); Step III, as the main driving plate (7) continues to move downward, the corresponding convex hull forming upper dies (31) are first driven downward by the multiple convex point punches (41) corresponding to the middle module (9), and then the corresponding convex hull forming upper dies (31) are driven downward by the multiple convex point punches (41) corresponding to the external module (10), until all the convex hull forming upper dies (31) are completely pressed together with the corresponding convex hull forming lower dies (32); Step IV, under the compression state of the convex hull forming die (3), a corresponding through hole is punched and sheared on the corresponding convex point by a punching punch (42).

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