Display backboard frame structure bending forming system

Abstract

The invention discloses a display backboard frame structure bending forming system which comprises a center positioning table, an inner template is arranged on the edge of the center positioning table; a bending mechanism is arranged on the outer side of the center positioning table and used for bending the side edge of the back plate into an F-folded frame structure section by section from outside to inside. The bending mechanism comprises a supporting assembly, a pressing mechanism and a stamping assembly. The stamping assembly comprises a plurality of stamping blocks, and the stamping blocks are sequentially provided with an upper stamping block, a first lower stamping block, a side stamping block and a second lower stamping block according to the stamping action sequence. The pressing mechanism, the first lower punching block and the second lower punching block form a pressure applying assembly. The supporting assembly is of a splicing structure with multiple lifting modules, and the multiple lifting modules, the multiple punching blocks and the pressing mechanism are controlled by the hydraulic system to be matched in action and used for forming a female die structure corresponding to the bending action of each section. The forming precision of the multi-side-edge F-folded frame structure of the back plate is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of display back panel processing equipment, in particular to a display back panel frame structure bending and forming system. Background Art

[0002] The display backplane is an important component of the display, which plays a role in supporting and protecting the display screen. Its frame structure is closely matched with the display screen assembly, so the structure and accuracy of the frame of the backplane play a vital role in the structural stability and overall quality of the display. The F-fold frame is a high-strength frame structure, which is usually formed by multiple bending processes using multiple devices, affecting the processing efficiency. Although some one-time forming equipment can be completed in one step, it is difficult to control the mold position accuracy and ensure the accuracy because it needs to form a complex structure in one time, and the mold structure design is complex, which in turn affects the forming accuracy of the F-fold frame structure. Summary of the invention

[0003] Purpose of the invention: In order to overcome the deficiencies in the prior art, the present invention provides a display back panel frame structure bending and forming system to ensure the forming accuracy of the back panel multi-side F-fold frame structure.

[0004] Technical solution: To achieve the above-mentioned purpose, a display back panel frame structure bending and forming system of the present invention includes a center positioning platform for positioning and placing the back panel, and an inner template is arranged at the edge of the center positioning platform. After the side edge of the back panel is bent into an F-folded frame structure, it is simultaneously bonded with the upper end face, the lower end face and the outer side face of the inner template;

[0005] A bending mechanism is arranged on the outer side of the central positioning platform corresponding to the side edge of the upper back plate to be formed into an F-fold, and the bending mechanism is used to bend the side edge of the back plate from the outside to the inside into an F-fold frame structure in sections, and multiple bending mechanisms are controlled to move synchronously through a hydraulic system;

[0006] The bending mechanism includes a supporting assembly, a pressing mechanism and a punching assembly. The supporting assembly is arranged to be lifted and lowered. When it rises to the upper limit position, its upper end surface is flush with the upper end surface of the inner template.

[0007] The punching assembly comprises a plurality of punch blocks, wherein the plurality of punch blocks are sequentially provided with an upper punch block, a first lower punch block, a side punch block and a second lower punch block in the order of punching action;

[0008] The pressing mechanism, the first lower punch block and the second lower punch block together form a pressing assembly, and the pressing assembly is used to press the side edge of the back plate onto the supporting assembly;

[0009] The support assembly is a spliced ​​structure of multiple lifting modules. The multiple lifting modules, multiple punches and clamping mechanisms are coordinated with the hydraulic system control action to form a die structure corresponding to each section of the bending action.

[0010] Furthermore, the upper punch block is fitted with the outer side surface of the support assembly, and the upper punch block and the outer side surface of the support assembly slide together through a first limiting structure, and the first limiting structure is used to limit the upper sliding limit position of the upper punch block; the distance between the inner side surface of the upper punch block and the outer surface of the pressure assembly is the thickness of a back plate side.

[0011] Furthermore, the support assembly includes an outermost first support unit and an inner second support unit, the first support unit and the second support unit slide together via a second limiting structure, and the second limiting structure is used to limit the lower limit sliding position of the first support unit relative to the second support unit.

[0012] Furthermore, the pressure-applying assembly comprises, from outside to inside, the first lower punch block, the second lower punch block and the clamping mechanism, the first lower punch block and the outer side surface of the second lower punch block are slidably fitted against each other, and the width of the first lower punch block is the width of the folded part of the F-fold.

[0013] Furthermore, the outer side surfaces of the first lower punch block and the second lower punch block slide in cooperation via a third limiting structure, and the third limiting structure is used to limit the sliding lower limit position of the first lower punch block.

[0014] Furthermore, the support assembly further comprises a third support unit, the third support unit is located inside the second support unit, and the side punch block is laterally advanced to approach the third support unit.

[0015] Furthermore, the clamping mechanism clamps the side edge of the back plate on the upper end surface of the inner template, the second lower punch block is lifted and slid in contact with the outer side surface of the clamping mechanism, a shaping block is arranged below the inner template, and the shaping block is lifted and lowered in contact with the side wall of the center positioning platform.

[0016] Furthermore, the first limiting structure, the second limiting structure and the third limiting structure are all provided with sensing modules at the limiting positions, which correspond to the first sensing module, the second sensing module and the third sensing module respectively, the first sensing module controls the signal transmission to be connected to the hydraulic valve of the upper punch block and the first supporting unit, the second sensing module controls the signal transmission to be connected to the hydraulic valve of the first lower punch block, and the third sensing module controls the signal transmission to be connected to the hydraulic valve of the upper punch block, the first supporting unit, the second supporting unit, the first lower punch block and the side punch block.

[0017] Further, the following steps are included:

[0018] S1, the support assembly moves up to the extreme position, and the back plate is positioned and placed on the central positioning platform;

[0019] S2, the pressure-applying assembly presses the side edge of the back plate against the support assembly and the inner template;

[0020] S3, the upper punch block moves upward to the limit position to complete the bending of stage I;

[0021] S4, the upper punch block and the first support unit move downward to the limiting position of the second limiting structure to form a second-stage primary bending die;

[0022] S5, the first lower punch is moved downward to the limit position to complete the first bending of section II;

[0023] S6, the upper punch, the first support unit, the second support unit, and the first lower punch retreat to their initial positions, and the side punch moves laterally forward to press the section I and fit it to the outer side surface of the third support unit, completing the secondary bending of the section II;

[0024] S7, the side punch block and the third support unit retreat to the initial position, the second lower punch block moves downward to the limit position, pushes the back plate side section III against the outer side surface of the inner template, pushes the back plate side section I against the lower end surface of the inner template, and completes the bending of section III;

[0025] S8, the shaping block moves upward to press the section I to fit with the lower end surface of the inner template, and the shaping block and the second lower punch block laterally limit the section II to fit with the section III, completing the F-bending shaping;

[0026] S9, the second lower punch block and the shaping block retreat to their initial positions, the inner template moves laterally relative to the central positioning platform to detach from the inner side surface of the F-folded frame structure, and then the back panel formed with the F-folded frame structure is removed from the central positioning platform.

[0027] Beneficial effects: The display back panel frame structure bending and forming system of the present invention clamps the side plate that does not need to be bent in its original state through the support component and the clamping component, and locates the crease of the section that needs to be bent at the outermost edge of the clamping part. The punch block of the corresponding step completes the bending of the corresponding bending section, ensuring that each bending only affects the material flow at the current crease position, and the material flow of other parts of the side is minimally affected. The three bends of the F-fold are decomposed into four bending action steps, which are completed in sequence from the outside to the inside, and each bend maintains a weak effect on the material inside the current crease, high-precision forming at the current crease, and reshaping of the formed part outside the current crease, thereby ensuring the forming accuracy and quality of the final formed F-fold frame structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of the coordination of the positions of the modules of the bending mechanism during the bending of section I of an embodiment of the present invention;

[0029] Figure 2 This is a schematic diagram of the coordination of the positions of the modules of the bending mechanism during the single bending of section II of an embodiment of the present invention;

[0030] Figure 3 This is a schematic diagram of the coordination of the positions of the modules of the bending mechanism during the secondary bending of section II of an embodiment of the present invention;

[0031] Figure 4 This is a schematic diagram of the coordination of the positions of the modules of the bending mechanism during the bending of the III section of an embodiment of the present invention;

[0032] Figure 5 This is a schematic diagram of the inner template structure of an embodiment of the present invention. DETAILED DESCRIPTION

[0033] The present invention will be further described below in conjunction with the accompanying drawings.

[0034] As attached Figure 1-5 The bending and forming system of a display back panel frame structure includes a center positioning platform 1 for positioning and placing the back panel. The edge of the center positioning platform 1 is provided with an inner template 2. After the side edge of the back panel is bent into an F-folded frame structure, it is simultaneously fitted with the upper end face, the lower end face and the outer side face of the inner template 2. The back panel is previously formed by stamping and cutting out the side shape through a sheet of material. After the multiple side edges are bent into an F-folded frame, firstly, the strength of the frame can be enhanced by bending, and secondly, a positioning and limiting structure for installing a display screen can be formed. Therefore, its forming accuracy affects its installation quality. High precision can ensure the straightness of the frame and reduce the curvature of the frame, thereby improving the tightness between the back panel frame and the display screen, avoiding the presence of a gap between the display screen installation and the back panel frame or the display screen being subjected to abnormal extrusion stress. The center positioning platform adopts a convex mold or a concave mold adapted to the stamping and forming structure in the middle of the back panel to realize the positioning of the back panel. The inner template plays the role of internal support and limiting of the formed F-folded frame structure, and is used to constrain the inner groove size of the lateral groove formed by the F-folded frame structure.

[0035] A bending mechanism is provided on the outer side of the center positioning platform 1 corresponding to the side of the back panel to be formed into an F-fold. The bending mechanism is used to bend the side of the back panel from the outside to the inside into an F-fold frame structure. Multiple bending mechanisms are controlled to move synchronously through a hydraulic system to achieve synchronous forming of multiple side edges of the back panel, thereby improving the overall forming efficiency.

[0036] The bending mechanism includes a support assembly, a clamping mechanism 13 and a punching assembly. The support assembly is arranged to be lifted and lowered. When it rises to the upper limit position, its upper end face is flush with the upper end face of the inner template 2. The punching assembly includes a plurality of punches. The plurality of punches are sequentially provided with an upper punch 3, a first lower punch 4, a side punch 5 and a second lower punch 6 in the order of punching action. The clamping mechanism 13 and the first lower punch 4 and the second lower punch 6 constitute a pressure assembly, which is used to clamp the side of the back plate on the support assembly. For the bending of any side edge, firstly, the sheet material of the side portion that does not need to be bent is clamped and kept in its original state by the support assembly and the clamping assembly, and the fold of the section that needs to be bent is located at the outermost edge of the clamping portion. The punch of the corresponding step completes the bending of the corresponding bending section, ensuring that each bending only affects the material flow at the current fold position, and the material flow of other parts of the side is minimally affected. The three bends of the F-fold are decomposed into four bending action steps, which are completed in sequence from the outside to the inside. Each bend maintains a weak impact on the material inside the current fold, high-precision forming at the current fold, and reshaping of the formed part outside the current fold, thereby ensuring the forming accuracy and quality of the final F-fold frame structure.

[0037] The support assembly is a splicing structure of multiple lifting modules. Multiple lifting modules, multiple punches and a clamping mechanism 13 are connected to the hydraulic system control action to cooperate and form a die structure corresponding to each section of the bending action. Through cooperation, the area and position of the clamped part of the back plate side can be continuously changed according to the bending progress, so as to determine the crease position from the outside to the inside in sequence, and at the same time, a die structure adapted to the punch of the corresponding step action is formed to ensure that the current action punch cooperates with the corresponding die, so as to achieve the current bending molding in place and the pressure-maintaining shaping of the formed part. Through continuous high-precision bending molding and shaping, the accuracy of each bending is ensured, and then the molding accuracy of the final F-fold structure is ensured. One of the 180° folding bends is completed in two steps, and each time a 90° bend is completed, further ensuring the molding accuracy. Among them, the directional noun description of "inside" and "outside" is a position description relative to the center positioning platform. The side close to the center positioning platform is the inside, and the side away from the center positioning platform is the outside.

[0038] As attached Figure 1As shown in , the upper punch 3 fits with the outer side surface of the support assembly, and the upper punch 3 and the outer side surface of the support assembly slide in cooperation through the first limiting structure 7, and the first limiting structure 7 is used to limit the upper limit position of the sliding of the upper punch 3; the distance between the inner side surface of the upper punch 3 and the outer surface of the pressure assembly is the thickness of the side edge of the back plate. That is, the support assembly and the pressure assembly clamp the material on the inner side of the first fold, and the outer side surface of the pressure assembly is used as the forming surface. The upper punch pushes the material on the outer side of a fold to bend upward until it fits with the outer side surface of the pressure assembly, completing the bending of section I. The bending angle is determined by the inclination angle of the adjacent surfaces of the upper punch and the pressure assembly.

[0039] The support assembly includes an outermost first support unit 8 and an inner second support unit 9, and the first support unit 8 and the second support unit 9 cooperate and slide with each other through a second limiting structure 10, and the second limiting structure 10 is used to limit the lower limit position of the sliding of the first support unit 8 relative to the second support unit 9. The lower limit position is used for limiting the formation of the concave mold structure during the first 90° bend at the 180° bend, so as to ensure the bending accuracy of this bend.

[0040] The pressure-applying components are, from outside to inside, the first lower punch block 4, the second lower punch block 6 and the clamping mechanism 13. The outer side surfaces of the first lower punch block 4 and the second lower punch block 6 are slidably fitted together. The width of the first lower punch block 4 is the width of the folded part of the F-fold, wherein the folded part refers to the width of the overlapping part at the 180° bend. The outer side surfaces of the first lower punch block 4 and the second lower punch block 6 are slidably fitted together through a third limiting structure 11, and the third limiting structure 11 is used to limit the sliding lower limit position of the first lower punch block 4.

[0041] As attached Figure 2 As shown in , the second support unit 9 is located at the upper limit position, the first support unit 8 is located at the relative sliding lower limit position relative to the second support unit 9, and when the first lower punch block 4 is located at the sliding lower limit position, the distance between the lower end face of the first lower punch block 4 and the upper end face of the first support unit 8 is the thickness of the side edge of the back plate, and the distance between the inner side face of the first lower punch block 4 and the outer side face of the second support unit 9 is the thickness of the side edge of the back plate. That is, the upper end face and the outer side face of the second support unit 9 are used as the forming and positioning surface of the first section of the one-time bending, and the first lower punch block 4 pushes the second section of the material to fit with the outer side face of the second support unit 9 to ensure the forming accuracy, and at the same time, the L-shaped shaping surface formed by the upper punch block 3, the first support unit 8 and the second support unit 9 is formed, and the shaping of the first section of the bending is completed by the cooperation of the first lower punch block 4 and the L-shaped shaping surface.

[0042] The support assembly further includes a third support unit 12 , which is located inside the second support unit 9 , and the side punch block 5 is laterally pushed closer to the third support unit 12 .

[0043] As attached Figure 3 As shown in , the side punch block 5 is pushed to the limit position, the third support unit 12 is located at the upper limit position of movement, and when the second lower punch block 6 presses the side of the back plate on the third support unit 12, the distance between the inner end face of the side punch block 5 and the outer side face of the third support unit 12 is one back plate side thickness, and the distance between the upper side face of the side punch block 5 and the lower end face of the second lower punch block 6 is double the back plate side thickness. That is, the side punch block pushes the II section material to bend inward 90° on the basis of the crease of the first bend, so that the II section material is parallel to the III section material, and the I section material is perpendicular to the III section material, so as to achieve a secondary bend. After bending in place, the upper side face of the side punch block and the lower end face of the second lower punch block 6 are used to hold the pressure to shape the bending of the II section material, and the upper side face of the side punch block, the outer side face of the third support unit 12 and the lower end face of the second lower punch block 6 are used to shape the bending of the I section again. While ensuring the bending accuracy at the current position, the previous bend is shaped to maintain the same accuracy.

[0044] The clamping mechanism 13 presses the side edge of the back plate on the upper end surface of the inner template 2, and the second lower punch block 6 is lifted and slid in contact with the outer side surface of the clamping mechanism 13. A shaping block 14 is arranged below the inner template 2, and the shaping block 14 is lifted and lowered in contact with the side wall of the center positioning platform 1.

[0045] As attached Figure 4 As shown in , when the shaping block 14 rises to the limit position and the second lower punch block 6 moves down to the limit position, the distance between the inner side surface of the second lower punch block 6 and the outer side surface of the inner template 2 is the thickness of the side of the back plate, the distance between the inner side surface of the second lower punch block 6 and the outer side surface of the shaping block 14 is twice the thickness of the side of the back plate, and the distance between the upper end surface of the shaping block 14 and the lower end surface of the inner template 2 is the thickness of the side of the back plate. That is, with the inner template as the final shaping punch, the second lower punch block 6 pushes the III section material to bend around the outer upper corner of the inner template 2 to fit with the outer side surface of the inner template, and at the same time, the I section material fits with the lower side surface of the inner template, completing the bending of the III section, and then realizing the forming of the F-fold frame structure. Finally, through the pressure of the shaping block, in cooperation with the inner side surface of the second lower punch block 6 and the lower side surface of the inner template, the entire F-fold frame structure is subjected to the final pressure-maintaining shaping to ensure that its forming accuracy is correct.

[0046] The first limiting structure 7, the second limiting structure 10 and the third limiting structure 11 are all provided with sensing modules at the limiting positions, which correspond to the first sensing module 15, the second sensing module 16 and the third sensing module 17 respectively. The first sensing module 15 controls the signal transmission to be connected to the hydraulic valve of the upper punch block 3 and the first supporting unit 8, the second sensing module 16 controls the signal transmission to be connected to the hydraulic valve of the first lower punch block 4, and the third sensing module 17 controls the signal transmission to be connected to the hydraulic valve of the upper punch block 3, the first supporting unit 8, the second supporting unit 9, the first lower punch block 4 and the side punch block 5.

[0047] Preferably, the first limiting structure 7, the second limiting structure 10 and the third limiting structure 11 all adopt the cooperation mode of limiting sliding groove and sliding block, as shown in the attached Figure 1 As shown in the figure, the slide groove of the first limiting structure 7 is opened on the side wall of the upper punch block 3, and the corresponding slider is fixed on the side wall of the first support unit 8. When the slider is in contact with the groove surface at the bottom end of the slide groove, the upper punch block 3 rises to the upper limit position, as shown in the figure. Figure 2 As shown in the figure, the slide groove of the second limiting structure 10 is opened on the side wall of the second support unit 9, and the corresponding slider is fixed on the side wall close to the first support unit 8. The slide groove of the third limiting structure 11 is opened on the side wall of the second lower punch block 6, and the slider is fixed on the side wall of the first lower punch block 4; all reach the limit position when the slider contacts the bottom of the groove, so the three sensing modules are embedded and installed on the bottom end surface of the corresponding slide groove, which can be preferably a pressure sensor, to judge whether it is in place by sensing the pressure applied by the slider to the bottom end surface of the groove, and close the corresponding hydraulic valve when the preset pressure value is reached to avoid the situation of not being in place.

[0048] In a single bending mechanism, multiple support units, clamping mechanisms and multiple punch blocks are all independently movable blocks. Each movable block is driven by an independent oil cylinder, and the movement direction of each movable block is controlled by the change of direction of the hydraulic valve of the hydraulic system. As for the control of the final stop position, most movable blocks only have two extreme positions, forward and backward. The position accuracy can be achieved by limiting the piston rod length or the additional limit block. For example, the first support unit has two support positions, which are achieved by setting a limit structure between the adjacent movable blocks. That is, there is no need to finely control the stroke of each oil cylinder to ensure the stop position accuracy of each movable block at each stage, but it is achieved by the dynamic and static coordination of adjacent movable blocks and physical limitation. The hydraulic system only needs to control the moving direction of the movable block, and the moving direction is a single bidirectional linear motion. It can stop when reaching the limit position, and the next step of the movable block can be triggered by installing a sensing element at the limit position. The same movable blocks in multiple bending mechanisms are synchronously moved, thereby realizing the synchronous multi-sided bending, simplifying the control difficulty, making the coordination of each movable block smoother and responding faster, so as to improve the forming processing efficiency. Moreover, each movable block is slidably fitted against each other, which plays a role of mutual limitation and sliding guidance, ensuring the stability of the sliding movement of each movable block, further improving the position accuracy of each movable block in each step, and then ensuring the accuracy of the forming mold composed of each stage, thereby ensuring the bending accuracy of each stage.

[0049] As attached Figure 5 As shown in the figure, it is a center positioning table 1 used for a back panel of an F-fold frame structure with three side edges processed. Due to the processing of the three sides, there is an opening on one side, and the lower side in the figure is the opening direction. Therefore, the corresponding inner template is divided into three-section slats, which slide in the direction of the opening respectively to achieve separation from the F-fold frame structure after forming.

[0050] The stamping forming process method of the stamping forming system specifically comprises the following steps:

[0051] S1, the support assembly moves up to the extreme position, and the back plate is positioned and placed on the central positioning platform 1;

[0052] S2, the pressure-applying assembly presses the side edge of the back plate against the support assembly and the inner template 2;

[0053] S3, the upper punch block 3 moves upward to the limit position to complete the bending of stage I;

[0054] S4, the upper punch block 3 and the first support unit 8 move downward to the limiting position of the second limiting structure 10 to form a second-stage primary bending die;

[0055] S5, the first lower punch block 4 moves downward to the limit position, completing the first bending of section II;

[0056] S6, the upper punch block 3, the first support unit 8, the second support unit 9, and the first lower punch block 4 retreat to the initial position, and the side punch block 5 moves laterally to press the section I and fit the outer side surface of the third support unit 12 to complete the secondary bending of the section II;

[0057] S7, the side punch block 5 and the third support unit 12 retreat to the initial position, the second lower punch block 6 moves downward to the limit position, pushes the back plate side section III against the outer side surface of the inner template 2, pushes the back plate side section I against the lower end surface of the inner template 2, and completes the bending of section III;

[0058] S8, the shaping block 14 moves upward to press the section I to fit with the lower end surface of the inner template 2, and the shaping block 14 and the second lower punch block 6 laterally limit the section II to fit with the section III, completing the F-bending shaping;

[0059] S9, the second lower punch block 6 and the shaping block 14 retreat to the initial position, the inner template 2 moves laterally relative to the center positioning platform 1 to separate from the inner side surface of the F-fold frame structure, and then the back panel formed with the F-fold frame structure is removed from the center positioning platform 1.

[0060] 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. A display back panel frame structure bending and forming system, characterized by: It comprises a center positioning platform (1) for positioning and placing a back plate, the edge of the center positioning platform (1) is provided with an inner template (2), and the side edge of the back plate is folded into an F-folded frame structure and is simultaneously fitted with the upper end face, the lower end face and the outer side face of the inner template (2); A bending mechanism is arranged on the outer side of the central positioning platform (1) corresponding to the side edge of the upper back plate to be formed into an F-fold, and the bending mechanism is used to bend the side edge of the back plate section by section from the outside to the inside into an F-fold frame structure, and multiple bending mechanisms are controlled to move synchronously through a hydraulic system; The bending mechanism comprises a supporting assembly, a pressing mechanism (13) and a punching assembly; the supporting assembly is arranged to be raised and lowered, and when it rises to an upper limit position, its upper end surface is flush with the upper end surface of the inner template (2); The punching assembly comprises a plurality of punch blocks, wherein the plurality of punch blocks are sequentially provided with an upper punch block (3), a first lower punch block (4), a side punch block (5) and a second lower punch block (6) in a punching action sequence; The pressing mechanism (13), the first lower punch block (4) and the second lower punch block (6) together form a pressing assembly, and the pressing assembly is used to press the side edge of the back plate onto the supporting assembly; The support assembly is a spliced ​​structure of multiple lifting modules, and the multiple lifting modules, the multiple punches and the clamping mechanism (13) are coordinated with the hydraulic system control action to form a die structure corresponding to each section of the bending action.

2. A display back panel frame structure bending and forming system according to claim 1, characterized in that: The upper punch block (3) is fitted with the outer side surface of the support component, and the upper punch block (3) and the outer side surface of the support component slide in cooperation through a first limiting structure (7), and the first limiting structure (7) is used to limit the upper sliding limit position of the upper punch block (3); the distance between the inner side surface of the upper punch block (3) and the outer surface of the pressure component is the thickness of a back plate side.

3. A display back panel frame structure bending and forming system according to claim 2, characterized in that: The support assembly comprises an outermost first support unit (8) and an inner second support unit (9); the first support unit (8) and the second support unit (9) are slidably coupled via a second limiting structure (10); the second limiting structure (10) is used to limit the sliding lower limit position of the first support unit (8) relative to the second support unit (9).

4. A display back panel frame structure bending and forming system according to claim 3, characterized in that: The pressure-applying assembly comprises, from outside to inside, the first lower punch block (4), the second lower punch block (6) and the clamping mechanism (13); the first lower punch block (4) and the second lower punch block (6) are slidably fitted against the outer side surfaces; the width of the first lower punch block (4) is the width of the folded portion of the F-fold.

5. A display back panel frame structure bending and forming system according to claim 4, characterized in that: The outer side surfaces of the first lower punch block (4) and the second lower punch block (6) slide in cooperation via a third limiting structure (11), and the third limiting structure (11) is used to limit the sliding lower limit position of the first lower punch block (4).

6. A display back panel frame structure bending and forming system according to claim 5, characterized in that: The support assembly further comprises a third support unit (12), wherein the third support unit (12) is located inside the second support unit (9), and the side punch block (5) is laterally advanced to approach the third support unit (12).

7. A display back panel frame structure bending and forming system according to claim 6, characterized in that: The clamping mechanism (13) clamps the side edge of the back plate against the upper end surface of the inner template (2); the second lower punch block (6) is raised and lowered and slidably attached to the outer side surface of the clamping mechanism (13); a shaping block (14) is arranged below the inner template (2); the shaping block (14) is raised and lowered attached to the side wall of the center positioning platform (1).

8. A display back panel frame structure bending and forming system according to claim 7, characterized in that: The first limiting structure (7), the second limiting structure (10) and the third limiting structure (11) are all provided with sensing modules at the limiting positions, which correspond to the first sensing module (15), the second sensing module (16) and the third sensing module (17) respectively. The first sensing module (15) controls the signal transmission to be connected to the hydraulic valve of the upper punch block (3) and the first supporting unit (8), the second sensing module (16) controls the signal transmission to be connected to the hydraulic valve of the first lower punch block (4), and the third sensing module (17) controls the signal transmission to be connected to the hydraulic valve of the upper punch block (3), the first supporting unit (8), the second supporting unit (9), the first lower punch block (4) and the side punch block (5).

9. A stamping forming process method for a display back panel frame structure bending forming system according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1, the support assembly moves upward to the extreme position, and the back plate is positioned and placed on the central positioning platform (1); S2, the pressure-applying assembly presses the side edge of the back plate against the support assembly and the inner template (2); S3, the upper punch (3) is moved upward to the limit position, completing the bending of stage I; S4, the upper punch block (3) and the first support unit (8) move downward to the limiting position of the second limiting structure (10), forming a second-stage primary bending die; S5, the first lower punch (4) moves downward to the limit position, completing the first bending of section II; S6, the upper punch block (3), the first support unit (8), the second support unit (9), and the first lower punch block (4) retreat to their initial positions, and the side punch block (5) moves laterally forward to press the section I and the outer side surface of the third support unit (12) to fit together, thus completing the secondary bending of the section II; S7, the side punch block (5) and the third support unit (12) retreat to their initial positions, the second lower punch block (6) moves downward to the limit position, pushes the back plate side section III against the outer side surface of the inner template (2), pushes the back plate side section I against the lower end surface of the inner template (2), and completes the bending of section III; S8, the shaping block (14) moves upward to press the section I to fit with the lower end surface of the inner template (2), and the shaping block (14) and the second lower punch block (6) laterally limit the section II to fit with the section III, thus completing the F-bending shaping; S9, the second lower punch block (6) and the shaping block (14) retreat to their initial positions, the inner template (2) moves laterally relative to the central positioning platform (1) to detach from the inner side surface of the F-fold frame structure, and then the back panel formed with the F-fold frame structure is removed from the central positioning platform (1).

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