Forming die for pi-shaped bending structure on large television backboard

Abstract

The utility model discloses a forming die of a Pi-shaped bending structure on a large television backboard, which comprises a first die, a second die, a third die, a fourth die and a fifth die which are mutually independent, the first die is used for forming a second foot and a first inclined surface of the Pi-shaped structure, the second die is used for bending the first inclined surface for the first time, and the fifth die is used for bending the second foot of the Pi-shaped structure. The third die is used for bending the front end of the first inclined surface to form a first foot, the fourth die is used for bending the first inclined surface for the second time, and the fifth die is used for bending the first inclined surface for the third time to form a vertical connecting surface. According to the utility model, the Pi-shaped bending structure is decomposed into a plurality of small-angle bending actions by adopting five pairs of dies, so that not only can the stress concentration of each bending action in a plate be slowed down so as to reduce the reject ratio and the rejection rate, but also the operation space of each bending action on the die can be reduced, the size and the manufacturing cost of the die are reduced, and the production efficiency is improved. And a punching machine with smaller tonnage can also meet the punching forming production of the large-scale television back plate, and the production cost of the large-scale television back plate is obviously reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of stamping dies, in particular to a forming die for a π-shaped bending structure on a large-scale television back panel. Background Art

[0002] There are many avoidance or protective bending structures on the back panel of a large TV. Due to the large size of the sheet, some of the bending structures are difficult to form using conventional bending processes. For example, the structure near the side of the F-shaped TV back panel, and other bending structures are formed on one leg of the π-shaped bending structure. If conventional processes are still used, a large avoidance space needs to be reserved between the upper and lower molds, resulting in a very large mold volume and high manufacturing costs. In addition, large-angle bending molding is prone to cracks and other defects on the sheet. The high defect rate will further increase the product's shared cost and production cost. Utility Model Content

[0003] In response to the problems existing in the above-mentioned prior art, the utility model provides a forming process and a forming mold for the π-shaped bending structure on the back panel of a large TV. Five molds are used to first decompose the overlapping bending structure between the connecting surface and the first leg and the second leg in the π-shaped bend into two bending actions with smaller angles. This can not only slow down the stress concentration in the sheet material during each bending action, avoid cracks and breakage defects, reduce the scrap rate, and reduce production losses, but also reduce the operating space of each bending action on the mold, reduce the volume and manufacturing cost of the mold, and a smaller tonnage punch press can also meet the stamping and forming production of large TV back panels, which can significantly reduce the production cost of large TV back panels. It can also be used as a reference for the stamping process design of similar products and has great promotion value.

[0004] In order to solve the above technical problems, a technical solution adopted by the present invention is as follows:

[0005] A forming mold for a π-shaped bent structure on a large-scale television back panel includes a first mold, a second mold, a third mold, a fourth mold, and a fifth mold that are independent of each other. The first mold is used to form a second leg and a first inclined surface of the π-shaped structure on a sheet material. The second mold is used to bend the first inclined surface for the first time. The third mold is used to bend the front end of the first inclined surface for the second time to form the first leg of the π-shaped structure. The fourth mold is used to bend the first inclined surface for the second time. The fifth mold is used to bend the first inclined surface for the third time to form a vertical connecting surface on the π-shaped structure.

[0006] The cam is adapted to move relative to the first moulding plate in a direction of compression against the workpiece, and the cam is adapted to move relative to the first moulding plate in a direction of compression against the workpiece.

[0007] The cam is secured to the workpiece by the second pressing means and the second pressing means is secured to the workpiece by the second pressing means.

[0008] The upper mold of the third mold is provided with a third upper mold base, a third upper stripping plate, a third upper mold plate and a third upper pressing plate. The third upper mold plate is provided on the third upper stripping plate and is slidably connected to the third upper mold base through a third upper limit piece extending along the mold closing direction. The lower end thereof is adapted to the semi-finished product formed by the second mold, and the third upper pressing plate is provided beside the third upper mold plate; the lower mold of the third mold is provided with a third lower mold plate, a third lower stripping plate, a third forming insert, a third side push plate and a third forming punch. The third lower stripping plate and the third lower mold plate are fixedly connected and the end thereof facing the third upper pressing plate extends to the outside of the third lower mold plate. The upper ends of both are adapted to the semi-finished product formed by the second mold, and the third forming insert The 3rd cam is provided with a third cam which is adapted to move the first end of the cam and the second end of the cam, and the 3rd cam is provided with a third cam which is adapted to move the first end of the cam and the second end of the cam.

[0009] The upper mold of the fourth mold is provided with a fourth upper mold plate, a fourth upper strip plate and a fourth bending knife, the fourth upper mold plate is fixedly connected to the fourth upper strip plate and the lower end thereof is adapted to the semi-finished product formed by the third mold, the fourth bending knife is provided on the side of the fourth upper mold plate and can be translated relative to the fourth upper mold plate along the mold closing direction under the action of external force, and the lower end thereof is provided with a fourth inclined surface for bending the first inclined surface toward the side wall of the fourth upper mold plate; the lower mold of the fourth mold is provided with a fourth lower mold plate and a fourth lower strip plate, one end of the fourth lower mold plate extends to the outside of the fourth lower strip plate and the upper end thereof is adapted to the semi-finished product formed by the third mold; when the mold is closed, the fourth upper mold plate, the fourth upper strip plate and the fourth lower strip plate press the sheet material, and the fourth bending knife continues to move down under the continuous action of the mold closing force to bend the front part of the first inclined surface downward;

[0010] The upper mold of the fifth mold is provided with a fifth upper mold plate, a fifth upper strip plate and a fifth bending knife. The fifth upper mold plate is fixedly connected to the fifth upper strip plate and its lower end portion is adapted to the semi-finished product formed by the fourth mold. The fifth bending knife is provided beside the fifth upper mold plate and can slide relative to the fifth upper mold plate along the mold closing direction under the action of external force; the lower mold of the fifth mold is provided with a fifth lower mold plate, a fifth forming insert, a fifth shaping insert and a inserting knife. The fifth forming insert is provided directly below the fifth bending knife and fixed on the lower mold. The fifth inserting knife is fixed on the lower mold, and its upper end side wall is transmission-connected with the fifth shaping insert. The fifth shaping insert is slidingly provided at The lower end of the fifth lower template and one end thereof facing the fifth forming insert are adapted to the connecting surface and the first leg. The fifth lower template is movably mounted on the lower mold and can be translated relative to the insert knife along the mold closing direction under the action of external force. When the mold is closed, the fifth upper stripping plate and the fifth lower template press the sheet material, and the fifth bending knife continues to move downward under the continuous action of the mold closing force, and cooperates with the fifth forming insert to bend the first inclined surface to form the vertical connecting surface. Synchronously, the fifth lower template pushes the fifth slider to continue to move downward, and cooperates with the fifth insert knife to push the fifth shaping insert to be translated relative to the fifth lower template to support the connecting surface and the first leg.

[0011] As a further elaboration of the above technical solution:

[0012] In the above technical solution, the first mold is also provided with a first upper mold base, a first lower stopper and a first lower mold base: the first upper mold base is fixedly connected to the first upper forming punch and is slidably connected to the first upper template through a first upper limit member extending along the mold closing direction; the first lower mold base is fixedly connected to the first lower stopper and is slidably connected to the first lower template and the first lower stripping plate through a first lower limit member extending along the mold closing direction, and the first lower stopper is arranged on the side of a side wall of the first lower forming punch facing away from the first lower template.

[0013] In the above technical solution, the second mold is also provided with a second upper mold base, a second upper stop block and a second outer release plate: the second upper mold base is fixedly connected to the second upper stop block and the second bending knife and is slidably connected to the second upper release plate through a second upper limit member extending along the mold closing direction; the second upper stop block is arranged on the side of the second bending knife away from the side wall of the second forming punch; the second outer release plate is arranged below the second upper stop block and the second bending knife and is slidably connected to the lower mold through a second lower limit member extending along the mold closing direction, and the second outer release plate is arranged on the side of the second forming punch away from the second lower template.

[0014] In the above technical solution, a third slide and a third slider are further provided on the lower mold of the third mold. The third slide is arranged beside the third forming punch and extends horizontally. The third slider is slidably arranged on the third slide, and a third mounting groove and an inclined third side push slide are respectively formed on its two opposite side walls. The third forming punch is detachably fixed in the third mounting groove, and the third side push plate is slidably installed on the third side push slide.

[0015] In the above technical solution, the fourth mold is also provided with a fourth upper mold base and a fourth upper baffle. The fourth upper baffle is arranged on the side of the fourth bending knife away from the fourth upper mold plate, and both are fixedly connected to the fourth upper mold base. The fourth upper mold base is transmission-connected to the fourth upper stripping plate and the fourth upper mold plate through a fourth upper limiting member.

[0016] In the above technical solution, the lower mold of the fifth mold is further provided with a fifth lower clamping plate, a fifth slide and a fifth slider. The fifth lower clamping plate is fixedly connected to the fifth lower mold plate and movably connected to the lower mold through a fifth lower limit member extending in the mold closing direction. The fifth lower clamping plate is provided with the fifth slide extending horizontally, and the fifth slider is slidably mounted on the fifth slide. A fifth inclined surface is provided on one side wall of the fifth slider, and the fifth inclined surface is slidably connected to the inserter. The fifth shaping insert is provided on the side wall of the fifth slider facing away from the inserter.

[0017] In the above technical solution, the upper die of the fifth mold is also fixed with a fifth upper stopper beside the fifth bending knife, and the lower die is also fixed with a fifth lower stopper below the fifth upper stopper. The fifth lower stopper is arranged on the side of the fifth forming insert away from the fifth shaping insert.

[0018] Compared with the prior art, the beneficial effect of the present invention is that: by adopting five pairs of molds, the overlapping bending structure between the connecting surface and the first leg and the second leg in the π-shaped bend is first decomposed into two bending actions with smaller angles, which not only can slow down the stress concentration in the sheet material during each bending action, avoid cracks and breakage defects, reduce the scrap rate, and reduce production losses, but also can reduce the operating space of each bending action on the mold, reduce the volume and manufacturing cost of the mold, and a smaller tonnage punch press can also meet the stamping and forming production of large TV back panels, which can significantly reduce the production cost of large TV back panels, and can be used as a reference for the stamping process design of similar products, and has great promotion value. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Schematic diagram of the molding process of the product in this embodiment;

[0020] Figure 2 This is a schematic structural diagram of the first mold in the open mold state in this embodiment;

[0021] Figure 3 This is a schematic structural diagram of the second mold in the open mold state in this embodiment;

[0022] Figure 4 This is a schematic structural diagram of the third mold in the embodiment when the mold is opened;

[0023] Figure 5 This is a schematic structural diagram of the fourth mold in the embodiment when the mold is opened;

[0024] Figure 6 It is a schematic structural diagram of the fifth mold in the open mold state in this embodiment.

[0025] In the figure: 001, sheet; 002, second leg; 003, first inclined surface; 004, first leg; 005, connecting surface;

[0026] 100, first mold; 110, first upper mold plate; 120, first upper forming punch; 130, first lower mold plate; 140, first lower stripper plate; 150, first lower forming punch; 160, first upper mold base; 170, first lower stopper; 180, first lower mold base;

[0027] 200, second mold; 210, second upper mold plate; 220, second upper stripper; 230, second bending knife; 240, second lower stripper; 250, second lower mold plate; 260, second lower forming punch; 270, second upper mold base; 280, second upper stopper; 290, second outer stripper;

[0028] 300, third mold; 310, third upper mold base; 320, third upper stripper plate; 330, third upper mold plate; 340, third upper pressing plate; 350, third lower mold plate; 360, third lower stripper plate; 370, third forming insert; 380, third side push plate; 390, third forming punch; 31, third inclined surface; 32, third slideway; 33, third slider;

[0029] 400, fourth mold; 410, fourth upper mold plate; 420, fourth upper stripper plate; 430, fourth bending knife; 440, fourth inclined plane; 450, fourth lower mold plate; 460, fourth lower stripper plate; 470, fourth upper mold base; 480, fourth upper baffle plate;

[0030] 500, fifth mold; 510, fifth upper template; 520, fifth upper stripping plate; 530, fifth bending knife; 540, fifth lower template; 550, fifth forming insert; 560, fifth shaping insert; 570, inserting knife; 580, fifth lower splint; 590, fifth slide; 51, fifth slider; 52, fifth inclined plane; 53, fifth upper stopper; 54, fifth lower stopper. DETAILED DESCRIPTION

[0031] The present invention will be further described in detail below with reference to the accompanying drawings.

[0032] The embodiments described with reference to the accompanying drawings are illustrative and intended to explain the present application, and should not be construed as limiting the present application. In the description of this application, it should be understood that terms such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise" indicate positions or locations based on the positions or locations shown in the accompanying drawings. These terms are intended solely to facilitate the description of this application and simplify the description, and are not intended to indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limiting the present application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed to indicate or imply relative importance or to implicitly specify the number of the technical features referred to. Therefore, features specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of this application, "several" and "a plurality" mean two or more, unless otherwise specifically defined. In this application, unless otherwise specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be interpreted broadly. For example, they can refer to fixed, removable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; or internal communication between two components. A person skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances. In this application, unless otherwise specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or the first and second features being in contact through another feature between them. Furthermore, "above," "above," and "above" a first feature may include the first feature being directly above or diagonally above the second feature, or simply indicate that the first feature is at a higher level than the second feature. "Below," "below," and "below" a first feature may include the first feature being directly below or diagonally below the second feature, or simply indicate that the first feature is at a lower level than the second feature.

[0033] like Figure 1-6As shown, the forming mold for the π-shaped bending structure on the back panel of a large TV includes a first mold 100, a second mold 200, a third mold 300, a fourth mold 400, and a fifth mold 500, which are independent of each other. The first mold 100 is used to form the second leg 002 and the first inclined surface 003 of the π-shaped structure on the sheet 001. The second mold 200 is used to bend the first inclined surface 003 for the first time. The third mold 300 is used to bend the front end of the first inclined surface 003 for the second time to form the first leg 004 of the π-shaped structure. The fourth mold 400 is used to bend the first inclined surface 003 for the second time. The fifth mold 500 is used to bend the first inclined surface 003 for the third time to form the vertical connecting surface 005 on the π-shaped structure. For ease of understanding, Figure 1 The figure shows a structural schematic diagram of the forming process of the π-shaped bending structure in this embodiment.

[0034] The utility model uses five pairs of molds to first decompose the overlapping bending structure between the connecting surface 005 and the first leg 004 and the second leg 002 in the π-shaped bending into two bending actions with smaller angles. This not only can reduce the stress concentration in the sheet material during each bending action, avoid cracks and damage defects, reduce the scrap rate, and reduce production losses, but also can reduce the operating space of each bending action on the mold, reduce the volume and manufacturing cost of the mold, and a smaller tonnage punch press can also meet the stamping and forming production of large-scale TV back panels, which can significantly reduce the production cost of large-scale TV back panels and can serve as a reference for the stamping process design of similar products, with great promotion value.

[0035] like Figure 2As shown, the upper mold of the first mold 100 is provided with a first upper mold plate 110 and a first upper forming punch 120. The lower end and side wall of the first upper mold plate 110 are respectively adapted to the sheet material 001 and the second foot 002. The first upper forming punch 120 is provided beside the first upper mold plate 110 and its lower end is adapted to the first inclined surface 003. The first upper forming punch 120 can be translated relative to the first upper mold plate 110 along the mold closing direction under the action of external force; the lower mold of the first mold 100 is provided with a first lower mold plate 130, a first lower stripping plate 1 40 and the first lower forming punch 150, the first lower template 130 is fixedly connected to the first lower stripping plate 140 and the upper end portion thereof is adapted to the sheet material 001, one end portion of the first lower stripping plate 140 extends to the outside of the first lower template 130 and is adapted to the sheet material 001, the first lower forming punch 150 is matched and arranged below the first upper forming punch 120 and beside the first lower template 130, the first lower template 130 and the first lower stripping plate 140 can be translated relative to the first lower forming punch 150 along the mold closing direction under the action of external force. In this embodiment, the first mold 100 is further provided with a first upper mold base 160, a first lower stop 170 and a first lower mold base 180: the first upper mold base 160 is fixedly connected to the first upper forming punch 120 and is slidably connected to the first upper mold plate 110 through a first upper limit member extending along the mold closing direction; the first lower mold base 180 is fixedly connected to the first lower stop 170 and is slidably connected to the first lower mold plate 130 and the first lower stripping plate 140 through a first lower limit member extending along the mold closing direction, and the first lower stop 170 is arranged on the side wall of the first lower forming punch 150 facing away from the first lower mold plate 130.

[0036] like Figure 2 As shown, when the mold is closed, the first upper mold plate 110 and the first lower mold plate 130 first press the sheet material 001 to prevent it from moving. Under the action of the first upper limit member, the first upper forming punch 120 continues to move downward under the force of the mold closing, and cooperates with the first lower forming punch 150 and the first lower stripper 140 to form the second leg 002 and the first inclined surface 003 on the sheet material 001, while pressing the first lower mold plate 130 against the first lower mold base 180. When the mold is opened, the first upper mold base 160 drives the first upper forming punch 120 to leave the semi-finished product, and the first limit member pushes the first upper mold plate 110 to temporarily press the product. After the upper mold moves up a certain distance, the first upper mold base 160 pulls the first upper mold plate 110 away from the product, and the first lower limit member pushes the first lower mold plate 130 to reset and drive the product away from the first lower forming punch 150. During this process, the first lower stopper 170 can limit the displacement of the first lower forming punch 150 to ensure forming accuracy. In this embodiment, both the first upper limit member and the first lower limit member are nitrogen springs.

[0037] like Figure 3As shown, the upper mold of the second mold 200 is provided with a second upper mold plate 210, a second upper stripping plate 220 and a second bending knife 230. The second upper mold plate 210 is fixedly connected to the second upper stripping plate 220 and its lower end is adapted to the semi-finished product formed by the first mold 100. The second bending knife 230 extends along the mold closing direction and is arranged beside the second upper stripping plate 220. The second bending knife 230 can be translated relative to the second upper mold plate 210 along the mold closing direction under the action of external force; the lower mold of the second mold 200 is provided with a second lower stripping plate 240, the second lower template 250 and the second lower forming punch 260, the second lower stripping plate 240 is arranged at the upper end of the second lower template 250, one end of the second lower template 250 extends to the outside of the second lower stripping plate 240, and the upper ends of the two are adapted to the semi-finished product formed by the first mold 100, the second lower forming punch 260 is fixedly arranged on the side of the second lower template 250 and is arranged on the side of the second bending knife 230, and its upper end and one side end are respectively adapted to the front and rear of the first inclined surface 003. In this embodiment, the second mold 200 is also provided with a second upper mold base 270, a second upper stop 280 and a second outer stripping plate 290: the second upper mold base 270 is fixedly connected to the second upper stop 280 and the second bending knife 230 and is slidingly connected to the second upper stripping plate 220 through a second upper limit member extending along the mold closing direction; the second upper stop 280 is arranged on the side wall of the second bending knife 230 away from the second forming punch; the second outer stripping plate 290 is arranged below the second upper stop 280 and the second bending knife 230 and is slidingly connected to the lower mold through a second lower limit member extending along the mold closing direction, and the second outer stripping plate 290 is arranged on the side wall of the second forming punch away from the second lower template 250.

[0038] like Figure 3 As shown, when the mold is closed, the first upper template 210, the second upper strip plate 220 and the second lower strip plate 240 first press the sheet material 001, and the second bending knife 230 continues to move downward under the continuous action of the mold closing force, and pushes the second outer strip plate 290 downward to cooperate with the second forming punch 260 to bend the first inclined surface 003 for the first time; when the mold is opened, the upper mold drives the second bending knife 230 to leave the semi-finished product, and the second upper strip plate 220 and the second upper template 210 temporarily press the semi-finished product under the action of the second upper limit member. After the upper mold moves up a certain distance, it pulls the second upper strip plate 220 and the second upper template 210 away from the product and the lower mold, and the second lower limit member pushes the second lower template 250, the second lower strip plate 240 and the second outer strip plate 290 to move up and reset and lift the product from the second lower forming punch 260. In this embodiment, the second upper limit member and the second lower limit member are both nitrogen springs.

[0039] like Figure 4As shown, the upper mold of the third mold 300 is provided with a third upper mold base 310, a third upper stripping plate 320, a third upper mold plate 330 and a third upper pressing plate 340. The third upper mold plate 330 is provided on the third upper stripping plate 320 and is slidably connected to the third upper mold base 310 through a third upper limit member extending along the mold closing direction, and its lower end is adapted to the semi-finished product formed by the second mold 200. The third upper pressing plate 340 is provided on the side of the third upper mold plate 330; the lower mold of the third mold 300 is provided with a third lower mold plate 350, a third lower stripping plate 360, a third forming insert 370, a third side push plate 380 and a third forming punch 390. The third lower stripping plate 360 ​​and the third lower mold plate 350 are fixedly connected and Its end toward the third upper pressing plate 340 extends to the outside of the third lower template 350, and the upper ends of both are adapted to the semi-product formed by the second mold 200. The third forming insert 370 is arranged on the side wall of one end of the third lower stripping plate 360 ​​and its side wall is adapted to the bent first inclined surface 003. The third forming punch 390 is arranged beside the third forming insert 370 and its upper end and side wall are respectively adapted to the two ends bent on the first inclined surface 003. The third forming punch 390 is arranged on one side wall of the third side push plate 380 and is transmission-connected thereto. The other side wall of the third side push plate 380 is formed with a third inclined surface 31, and the third inclined surface 31 is arranged below the third upper pressing plate 340. In this embodiment, a third slide 32 and a third slider 33 are also provided on the lower mold of the third mold 300. The third slide 32 is arranged beside the third forming punch 390 and extends horizontally. The third slider 33 is slidably arranged on the third slide 32, and a third mounting groove and an inclined third side push slide are respectively formed on its two opposite side walls. The third forming punch 390 is detachably fixed in the third mounting groove, and the third side push plate 380 is slidably installed on the third side push slide.

[0040] like Figure 4 As shown, when the mold is closed, the third upper stripper plate 320, the third upper template 330 and the third lower template 350 press the sheet material 001, and the mold closing force continuously pushes the third upper pressing plate 340 downward, pushing the third side push plate 380 to slide on the lower mold, so as to push the third forming punch 390 and the third forming insert 370 to cooperate with the bent portion of the first inclined surface 003 to form the first leg 004. When the mold is opened, when the third upper pressing plate 340 moves upward, the third side push plate 380 slides in the opposite direction along the third slide 32, so that the third forming punch 390 leaves the third forming insert 370, and then the upper mold drives the third upper stripper plate 320 and the third upper template 330 to leave the lower mold, and the third lower limit member pushes the third lower template 350 and the third lower stripper plate 360 ​​to reset so that the product is separated from the lower mold. In this embodiment, in order to ensure that the third forming punch 390 quickly separates from the semi-finished product when the mold is opened, a horizontal spring is also provided on the lower mold to pull the third side push plate 380, which can quickly pull the third side push plate 380 away from the third forming insert through elastic restoring force when the mold is opened; the third upper limit member and the third lower limit member are both nitrogen springs.

[0041] like Figure 5 As shown, the upper mold of the fourth mold 400 is provided with a fourth upper mold plate 410, a fourth upper strip plate 420 and a fourth bending knife 430, the fourth upper mold plate 410 is fixedly connected to the fourth upper strip plate 420 and the lower end thereof is adapted to the semi-finished product formed by the third mold 300, the fourth bending knife 430 is provided on the side of the fourth upper mold plate 410 and can be translated relative to the fourth upper mold plate 410 along the mold closing direction under the action of external force, and the lower end thereof is provided with a fourth inclined surface 440 for bending the first inclined surface 003 on the side wall facing the fourth upper mold plate 410; the lower mold of the fourth mold 400 is provided with a fourth lower mold plate 450 and a fourth lower strip plate 460, one end of the fourth lower mold plate 450 extends to the outside of the fourth lower strip plate 460 and the upper end thereof is adapted to the semi-finished product formed by the third mold 300. In this embodiment, the fourth mold 400 is also provided with a fourth upper mold base 470 and a fourth upper baffle 480. The fourth upper baffle 480 is arranged on the side of the fourth bending knife 430 away from the fourth upper mold plate 410, and both are fixedly connected to the fourth upper mold base 470. The fourth upper mold base 470 is transmission-connected to the fourth upper stripping plate 420 and the fourth upper mold plate 410 through a fourth upper limit member.

[0042] like Figure 5 As shown, during mold closing, the fourth upper mold plate 410, the fourth upper release plate 420, and the fourth lower release plate 460 press the sheet metal. The fourth bending blade continues downward under the continued action of the mold closing force, bending the front portion of the first inclined surface downward. In this embodiment, the fourth upper limit member and the fourth lower limit member are both nitrogen springs.

[0043] like Figure 6As shown, the upper mold of the fifth mold 500 is provided with a fifth upper mold plate 510, a fifth upper stripping plate 520 and a fifth bending knife 530. The fifth upper mold plate 510 is fixedly connected to the fifth upper stripping plate 520 and its lower end is adapted to the semi-finished product formed by the fourth mold 400. The fifth bending knife 530 is provided beside the fifth upper mold plate 510 and can slide relative to the fifth upper mold plate 510 along the mold closing direction under the action of external force; the lower mold of the fifth mold 500 is provided with a fifth lower mold plate 540, a fifth forming insert 550, a fifth shaping insert 560 and the insert 570, the fifth forming insert 550 is arranged directly below the fifth bending knife 530 and fixed on the lower mold, the fifth insert 570 is fixed on the lower mold, and its upper end side wall is transmission connected with the fifth shaping insert 560, the fifth shaping insert 560 is slidingly arranged at the lower end of the fifth lower template 540 and its one end facing the fifth forming insert 550 is adapted to the connecting surface 005 and the first leg 004, the fifth lower template 540 is movably mounted on the lower mold and can be translated relative to the insert 570 along the mold closing direction under the action of external force. In this embodiment, the lower mold of the fifth mold 500 is also provided with a fifth lower clamping plate 580, a fifth slide 590 and a fifth slider 51. The fifth lower clamping plate 580 is fixedly connected to the fifth lower template 540 and is movably connected to the lower mold through a fifth lower limit member extending in the mold closing direction. The fifth lower clamping plate 580 is provided with a horizontally extending fifth slide 590, and the fifth slider 51 is slidably mounted on the fifth slide 590. A fifth inclined surface 52 is provided on one side wall of the fifth slider 51, and the fifth inclined surface 52 is slidably connected to the inserting knife 570. A fifth shaping insert 560 is provided on the side wall of the fifth slider 51 facing away from the inserting knife 570; the upper mold of the fifth mold 500 is also fixedly provided with a fifth upper stopper 53 beside the fifth bending knife 530, and the lower mold is also fixedly provided with a fifth lower stopper 54 below the fifth upper stopper 53. The fifth lower stopper 54 is provided on the side of the fifth molding insert 550 facing away from the fifth shaping insert 560.

[0044] like Figure 6 As shown, during mold closing, the fifth upper mold plate 510, the fifth upper stripper plate 520, and the fifth lower mold plate 540 press against the sheet material 001. The fifth bending blade 530 continues to move downward under the continued clamping force, cooperating with the fifth forming insert 550 to bend the first inclined surface 003 to form a vertical connecting surface 005. Simultaneously, the fifth lower mold plate 540 pushes the fifth slider 51 downward. The fifth slider 51 and the fifth inserting blade 570 slide relative to each other, pushing the fifth shaping insert 560 to translate relative to the fifth lower mold plate 540 to support the connecting surface B and the inner wall of the first leg A. In this embodiment, both the first upper and lower limiters are nitrogen springs.

[0045] A limit piece is provided on the upper die base / lower die base of the die, and the limit piece is transmission-connected or slidingly connected to the upper template / lower template and the upper stripping plate / lower stripping plate to achieve pressing the sheet material in the initial stages of mold closing and mold opening. This structure is common knowledge for those skilled in the art, and its specific structure will not be elaborated here.

[0046] The above does not limit the technical scope of the present invention. Any modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. The forming die of the π-shaped bending structure on the back panel of a large TV is characterized by: The method comprises a first mold, a second mold, a third mold, a fourth mold and a fifth mold which are independent of each other, wherein the first mold is used to form the second leg and the first inclined surface of the π-shaped structure on the sheet material, the second mold is used to bend the first inclined surface for the first time, the third mold is used to bend the front end of the first inclined surface for the second time to form the first leg of the π-shaped structure, the fourth mold is used to bend the first inclined surface for the second time, and the fifth mold is used to bend the first inclined surface for the third time to form a vertical connecting surface on the π-shaped structure, wherein: The cam is adapted to move relative to the first moulding plate in a direction of compression against the workpiece, and the cam is adapted to move relative to the first moulding plate in a direction of compression against the workpiece. The cam is secured to the workpiece by the second pressing means and the second pressing means is secured to the workpiece by the second pressing means. The upper mold of the third mold is provided with a third upper mold base, a third upper stripping plate, a third upper mold plate and a third upper pressing plate. The third upper mold plate is provided on the third upper stripping plate and is slidably connected to the third upper mold base through a third upper limit piece extending along the mold closing direction. The lower end thereof is adapted to the semi-finished product formed by the second mold, and the third upper pressing plate is provided beside the third upper mold plate; the lower mold of the third mold is provided with a third lower mold plate, a third lower stripping plate, a third forming insert, a third side push plate and a third forming punch. The third lower stripping plate and the third lower mold plate are fixedly connected and the end thereof facing the third upper pressing plate extends to the outside of the third lower mold plate. The upper ends of both are adapted to the semi-finished product formed by the second mold, and the third forming insert The 3rd cam is provided with a third cam which is adapted to move the first end of the cam and the second end of the cam, and the 3rd cam is provided with a third cam which is adapted to move the first end of the cam and the second end of the cam. The upper mold of the fourth mold is provided with a fourth upper mold plate, a fourth upper strip plate and a fourth bending knife, the fourth upper mold plate is fixedly connected to the fourth upper strip plate and the lower end thereof is adapted to the semi-finished product formed by the third mold, the fourth bending knife is provided on the side of the fourth upper mold plate and can be translated relative to the fourth upper mold plate along the mold closing direction under the action of external force, and the lower end thereof is provided with a fourth inclined surface for bending the first inclined surface toward the side wall of the fourth upper mold plate; the lower mold of the fourth mold is provided with a fourth lower mold plate and a fourth lower strip plate, one end of the fourth lower mold plate extends to the outside of the fourth lower strip plate and the upper end thereof is adapted to the semi-finished product formed by the third mold; when the mold is closed, the fourth upper mold plate, the fourth upper strip plate and the fourth lower strip plate press the sheet material, and the fourth bending knife continues to move down under the continuous action of the mold closing force to bend the front part of the first inclined surface downward; The upper mold of the fifth mold is provided with a fifth upper mold plate, a fifth upper stripping plate and a fifth bending knife, the fifth upper mold plate is fixedly connected to the fifth upper stripping plate and the lower end thereof is adapted to the semi-finished product formed by the fourth mold, the fifth bending knife is provided on the side of the fifth upper mold plate and can slide relative to the fifth upper mold plate along the mold closing direction under the action of external force; the lower mold of the fifth mold is provided with a fifth lower mold plate, a fifth forming insert, a fifth shaping insert and a inserting knife, the fifth forming insert is provided directly below the fifth bending knife and fixed on the lower mold, the inserting knife is fixed on the lower mold, the upper end side wall of the fifth shaping insert is transmission connected with the fifth shaping insert, the fifth shaping insert is slidingly provided at the lower end of the fifth lower mold plate and one end thereof facing the fifth forming insert is adapted to the connecting surface and the first foot, the fifth lower mold plate is movably mounted on the lower mold and can be translated relative to the inserting knife along the mold closing direction under the action of external force; the fifth mold The lower mold is also provided with a fifth lower clamping plate, a fifth slide and a fifth sliding block, the fifth lower clamping plate is fixedly connected with the fifth lower template and is movably connected to the lower mold through a fifth lower limit piece extending in the mold closing direction, the fifth lower clamping plate is provided with the fifth slide track extending horizontally, the fifth slide is slidably mounted on the fifth slide, one side wall of the fifth slide is provided with a fifth inclined surface, the fifth inclined surface is slidably connected with the inserting knife, and the fifth shaping insert is provided on the side wall of the fifth slide facing away from the inserting knife; when the mold is closed, the fifth upper stripping plate and the fifth lower template press the sheet, the fifth bending knife continues to move downward under the continuous action of the mold closing force, and cooperates with the fifth forming insert to bend the first inclined surface to form the vertical connecting surface, and synchronously, the fifth lower template pushes the fifth slider to continue to move downward, cooperates with the inserting knife, and pushes the fifth shaping insert to translate relative to the fifth lower template to support the connecting surface and the first foot.

2. The molding die according to claim 1, wherein: The first mold is also provided with a first upper mold base, a first lower stopper and a first lower mold base: the first upper mold base is fixedly connected to the first upper forming punch and is slidably connected to the first upper mold plate through a first upper limit member extending along the mold closing direction; the first lower mold base is fixedly connected to the first lower stopper and is slidably connected to the first lower mold plate and the first lower stripping plate through a first lower limit member extending along the mold closing direction, and the first lower stopper is arranged on the side of a side wall of the first lower forming punch away from the first lower mold plate.

3. The forming mold according to claim 1, wherein: The second mold is also provided with a second upper mold base, a second upper stop block and a second outer release plate: the second upper mold base is fixedly connected to the second upper stop block and the second bending knife and is slidably connected to the second upper release plate through a second upper limit member extending along the mold closing direction; the second upper stop block is arranged on the side of the second bending knife away from the side wall of the second lower forming punch; the second outer release plate is arranged below the second upper stop block and the second bending knife and is slidably connected to the lower mold through a second lower limit member extending along the mold closing direction, and the second outer release plate is arranged on the side of the second lower forming punch away from the second lower template.

4. The molding die according to claim 1, wherein: The lower mold of the third mold is also provided with a third slide and a third slider. The third slide is arranged beside the third forming punch and extends horizontally. The third slider is slidably arranged on the third slide. A third mounting groove and an inclined third side push slide are respectively formed on its two opposite side walls. The third forming punch is detachably fixed in the third mounting groove, and the third side push plate is slidably installed on the third side push slide.

5. The molding die according to claim 1, wherein: The fourth mold is also provided with a fourth upper mold base and a fourth upper baffle. The fourth upper baffle is arranged on the side of the fourth bending knife away from the fourth upper mold plate, and both are fixedly connected to the fourth upper mold base. The fourth upper mold base is transmission-connected to the fourth upper stripping plate and the fourth upper mold plate through a fourth upper limiting member.

6. The forming die according to claim 1, wherein: The upper die of the fifth mold is also fixed with a fifth upper stopper beside the fifth bending knife, and the lower die is also fixed with a fifth lower stopper below the fifth upper stopper. The fifth lower stopper is arranged beside the side of the fifth forming insert away from the fifth shaping insert.

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