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

Abstract

The invention discloses a forming process of a pi-shaped bending structure on a large television backboard. The forming process sequentially comprises the five steps of upward inclined bending, first-time downward vertical bending, lateral bending, downward inclined bending and second-time downward vertical bending. According to the invention, the overlapped bending structure between the connecting surface and the first pin and the second pin in the pi-shaped bending is decomposed into two small-angle bending actions, so that the stress concentration of each bending action in the plate can be slowed down, cracks and bad damage are avoided, the rejection rate is reduced, and the production loss is reduced; and moreover, the operation space of each bending action on the die can be reduced, the size and the manufacturing cost of the die can be reduced, a small-tonnage punching machine can also meet the punching forming production of large television backboards, the production cost of the large television backboards can be obviously reduced, and the die can be used as a reference for the punching process design of products of the same type and has high popularization value.

Description

Technical Field

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

[0002] There will be 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 close to the side of the F-type TV back panel, and other bending structures are formed on one leg of the π-shaped bending structure. If conventional processes are still used, it is necessary to reserve a large avoidance space on 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, and a high defective rate will further increase the product's shared cost and production cost. Summary of the invention

[0003] In view of the problems existing in the above-mentioned prior art, the present invention provides a forming process and a forming mold for the π-shaped bending structure on the back panel of a large TV, and decomposes 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 reduce 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, and can be used as a reference for the stamping process design of the same type of 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] The forming process of the π-shaped bending structure on the back panel of a large-scale TV includes the following steps in sequence:

[0006] Step S1-bending upwardly: forming a first inclined surface at one end of the first plane on the sheet material, and simultaneously forming a first bend bending upwardly by 90° at the intersection of the first inclined surface and the first plane;

[0007] Step S2—first downward vertical bending: bending the first inclined surface downward from the middle so that the front portion thereof faces vertically downward;

[0008] Step S3—lateral bending: bending the front portion laterally so that the front section thereof abuts against the first inclined surface, and the rear section thereof is bent downward by 90° relative to the front section to form a first leg of the π-shaped bending structure;

[0009] Step S4—bending downwardly: bending the first inclined surface together with the bending structure formed in steps S2 and S3 downward synchronously, so that the first inclined surface is inclined downward;

[0010] Step S5—second downward vertical bend: bend the first inclined surface again so that it is vertically oriented toward and abuts against the first bend to form a connecting surface of the π-shaped bending structure, and at the same time make the first plane connected thereto form a second leg of the π-shaped bending structure.

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

[0012] In the above technical solution, in step S1, a first angle between the first inclined surface and the first plane is between 10° and 30°; and in step S4, a second angle between the first inclined surface and the first plane is between 130° and 150°.

[0013] A technical solution adopted by the present invention is as follows:

[0014] The forming die of the π-shaped bending structure on the back panel of a large-scale TV comprises a first die, a second die, a third die, a fourth die and a fifth die which are independent of each other, wherein the first die, the second die, the third die, the fourth die and the fifth die are stamping dies for completing the steps S1, S2, S3, S4 and S5 described in the above technical solution respectively, wherein:

[0015] The upper die of the first die is provided with a first upper die plate and a first upper forming punch, the lower end portion and the side wall of the first upper die plate are respectively adapted to the sheet material, the first plane and the first bend, the first upper forming punch is provided beside the first upper die plate and the lower end portion thereof is adapted to the first inclined surface, and the first upper forming punch can be translated relative to the first upper die plate along the mold closing direction under the action of an external force; the lower die of the first die is provided with a first lower die plate, a first lower stripping plate and a first lower forming punch, the first lower die plate is fixedly connected to the first lower stripping plate and the upper end portion thereof is adapted to the sheet material, a first lower stripping plate The end of the first lower template extends to the outside of the first lower template and is adapted to the first plane. The first lower forming punch is matched and arranged below the first upper forming punch and is arranged beside the first lower template. The first lower template and the first lower stripping plate can be translated relative to the first lower forming punch along the mold closing direction under the action of external force. When the mold is closed, the first upper template and the first lower template first press the sheet material, and the first upper forming punch continues to move downward under the continuous action of the mold closing force, and cooperates with the first lower forming punch and the first lower stripping plate to form the first plane, the first bend and the first inclined surface on the sheet material;

[0016] The upper die of the second die is provided with a second upper die plate, a second upper stripping plate and a second bending knife, the second upper die plate is fixedly connected to the second upper stripping plate and the lower end thereof is adapted to the semi-finished product formed by the first die, the second bending knife extends along the mold closing direction and is arranged beside the second upper stripping plate, and the second bending knife can translate relative to the second upper die plate along the mold closing direction under the action of an external force; the lower die of the second die is provided with a second lower stripping plate, a second lower die plate and a second lower forming punch, the second lower stripping plate is arranged at the upper end of the second lower die plate, one end of the second lower die plate extends to the outer side of the second lower stripping plate, and the upper ends of the two are adapted to the semi-finished product formed by the first die, the second lower forming punch is fixedly arranged beside the second lower die plate and beside the second bending knife, and the upper end and one side end thereof are adapted to the front and rear of the first inclined surface respectively; when the mold is closed, the second upper stripping plate and the second lower stripping plate first press the sheet material, and the second bending knife continues to move downward under the continuous action of the mold closing force, and cooperates with the second forming punch to bend the first inclined surface for the first time;

[0017] The upper die of the third mold is provided with a third upper die seat, a third upper stripping plate, a third upper die plate and a third upper pressing plate. The third upper die plate is provided on the third upper stripping plate and is slidably connected with the third upper die seat through a third upper limit piece extending along the mold closing direction. The lower end portion 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 die plate; the lower die of the third mold is provided with a third lower die 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 is fixedly connected to the third lower die plate and its end portion facing the third upper pressing plate extends to the outside of the third lower die plate. The upper ends of both are adapted to the semi-finished product formed by the second mold. The third forming insert is arranged on a side wall of one end of the third lower stripping plate and its side wall is adapted to the front section, the third forming punch is arranged beside the third forming insert and its upper end and side wall are adapted to the rear section and the front section respectively, the third forming punch is arranged on a side wall of the third side push plate and is transmission-connected thereto, the other side wall of the third side push plate is formed with a third inclined surface, and the third inclined surface is arranged below the third upper pressing plate; when the mold is closed, the third upper stripping plate and the third lower template press the sheet material, and at the same time, the third upper pressing plate pushes the third side push plate to slide on the lower mold, so as to push the third forming punch to cooperate with the third forming insert to bend in the front section to form the first foot;

[0018] The upper die of the fourth die is provided with a fourth upper die plate, a fourth upper stripping plate and a fourth bending knife, the fourth upper die plate is fixedly connected to the fourth upper stripping plate and the lower end thereof is adapted to the semi-finished product formed by the third die, the fourth bending knife is provided on the side of the fourth upper die plate and can be translated relative to the fourth upper die 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 on the side wall facing the fourth upper die plate; the lower die of the fourth die is provided with a fourth lower die plate and a fourth lower stripping plate, one end of the fourth lower die plate extends to the outside of the fourth lower stripping plate and the upper end thereof is adapted to the semi-finished product formed by the third die; when the mold is closed, the fourth upper die plate, the fourth upper stripping plate and the fourth lower stripping plate press the sheet material, and the fourth bending knife continues to move downward under the continuous action of the mold closing force to bend the front part of the first inclined surface obliquely downward;

[0019] The upper die of the fifth die is provided with a fifth upper die plate, a fifth upper stripping plate and a fifth bending knife. The fifth upper die plate is fixedly connected to the fifth upper stripping plate and its lower end portion is adapted to the semi-finished product formed by the fourth die. The fifth bending knife is arranged beside the fifth upper die plate and can slide relative to the fifth upper die plate along the mold closing direction under the action of external force. The lower die of the fifth die is provided with a fifth lower die plate, a fifth forming insert, a fifth shaping insert and an inserting knife. The fifth forming insert is arranged directly below the fifth bending knife and fixedly mounted on the lower die. The fifth inserting knife is fixedly mounted on the lower die. The side wall of its upper end is transmission-connected to the fifth shaping insert. The fifth shaping insert is slidingly arranged at The lower end of the fifth lower template and one end thereof facing the fifth forming insert are matched with 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 move downward continuously, 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.

[0020] As a further elaboration of the above technical solution:

[0021] 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 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 wall of the first lower forming punch facing away from the first lower mold plate.

[0022] In the above technical solution, the second mold is also provided with a second upper mold base, a second upper stopper and a second outer release plate: the second upper mold base is fixedly connected to the second upper stopper 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 stopper is arranged on the side of a side wall of the second bending knife away from the second forming punch; the second outer release plate is arranged below the second upper stopper 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 a side wall of the second forming punch away from the second lower mold plate.

[0023] In the above technical solution, a third slide and a third slider are also 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.

[0024] In the above technical solution, the fourth mold is also provided with a fourth upper mold base and a fourth upper baffle plate. The fourth upper baffle plate 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 limit member.

[0025] In the above technical solution, a fifth lower clamping plate, a fifth slideway and a fifth slider are further provided on the lower die of the fifth mold; the fifth lower clamping plate is fixedly connected to the fifth lower template and movably connected to the lower die through a fifth lower limit member extending in the mold closing direction; the fifth lower clamping plate is provided with the fifth slideway extending horizontally; the fifth slider is slidably mounted on the fifth slideway; a fifth inclined surface is provided on one side wall of the fifth slider; the fifth inclined surface is slidably connected to the inserter; the fifth shaping insert is provided on the side wall of the fifth slider away from the inserter.

[0026] In the above technical solution, the upper die of the fifth mold is also fixedly provided with a fifth upper stopper on the side of the fifth bending knife, and the lower die is also fixedly provided with a fifth lower stopper below the fifth upper stopper, and the fifth lower stopper is arranged on the side of the fifth forming insert away from the fifth shaping insert.

[0027] Compared with the prior art, the beneficial effect of the present invention lies in that: by decomposing 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, not only can the stress concentration in the sheet material during each bending action be alleviated, cracks and breakage defects can be avoided, the scrap rate can be reduced, and production losses can be reduced, but also the operating space of each bending action on the mold can be reduced, the volume of the mold and the manufacturing cost can be reduced, 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 the same type of products, and has great promotion value. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a flowchart of the molding process in the present invention;

[0029] Figure 2 It is a structural schematic diagram of the molding process of the product in this embodiment;

[0030] Figure 3 This is a schematic diagram of the structure of the first mold in the open mold state in this embodiment;

[0031] Figure 4 This is a schematic diagram of the structure of the second mold in the open mold state in this embodiment;

[0032] Figure 5 This is a schematic diagram of the structure of the third mold in the open mold state in this embodiment;

[0033] Figure 6 This is a schematic diagram of the structure of the fourth mold in the open mold state in this embodiment;

[0034] Figure 7 It is a schematic diagram of the structure of the fifth mold in the open mold state in this embodiment.

[0035] In the figure: 001, sheet; 002, first plane; 003, first inclined plane; 004, first bend; A, first leg; B, connecting surface; C, second leg; a, first angle; b, second angle; m, front section; n, rear section;

[0036] 100, first mold; 110, first upper mold plate; 120, first upper forming punch; 130, first lower mold plate; 140, first lower stripping plate; 150, first lower forming punch; 160, first upper mold base; 170, first lower stopper; 180, first lower mold base;

[0037] 200, second mold; 210, second upper mold plate; 220, second upper stripping plate; 230, second bending knife; 240, second lower stripping plate; 250, second lower mold plate; 260, second lower forming punch; 270, second upper mold base; 280, second upper stopper; 290, second outer stripping plate;

[0038] 300, third mold; 310, third upper mold base; 320, third upper stripping plate; 330, third upper mold plate; 340, third upper pressing plate; 350, third lower mold plate; 360, third lower stripping plate; 370, third molding insert; 380, third side push plate; 390, third molding punch; 31, third inclined surface; 32, third slideway; 33, third slider;

[0039] 400, fourth mold; 410, fourth upper mold plate; 420, fourth upper stripping plate; 430, fourth bending knife; 440, fourth inclined plane; 450, fourth lower mold plate; 460, fourth lower stripping plate; 470, fourth upper mold base; 480, fourth upper baffle plate;

[0040] 500, the fifth mold; 510, the fifth upper template; 520, the fifth upper stripping plate; 530, the fifth bending knife; 540, the fifth lower template; 550, the fifth forming insert; 560, the fifth shaping insert; 570, the inserting knife; 580, the fifth lower clamping plate; 590, the fifth slide; 51, the fifth slider; 52, the fifth inclined plane; 53, the fifth upper stopper; 54, the fifth lower stopper. DETAILED DESCRIPTION

[0041] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0042] The embodiments described with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and cannot be understood as limiting the present application. In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present application, "several" and "multiple" mean two or more, unless otherwise clearly and specifically defined. In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a communication between the two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances. In this application, unless otherwise clearly specified and limited, the first feature "above" or "below" the second feature can include the first and second features being in direct contact, or it can include the first and second features not being in direct contact but being in contact through another feature between them. Moreover, the first feature "above", "above" and "above" the second feature include the first feature being directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature "below", "below" and "below" the second feature include the first feature being directly below and obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0043] For ease of understanding, Figure 1 A structural schematic diagram of the forming process of the π-shaped bending structure in this embodiment is shown.

[0044] like Figure 2 As shown, the forming process of the π-shaped bending structure on the back panel of a large-scale TV includes the following steps in sequence:

[0045] Step S1 - bending upwards: forming a first inclined surface 003 at one end of the first plane 002 on the sheet material 001, and simultaneously forming a first bend 004 bending upwards by 90° at the intersection of the first inclined surface 003 and the first plane 002;

[0046] Step S2—first downward vertical bending: bend the first inclined surface 003 downward from the middle so that its front portion faces vertically downward;

[0047] Step S3 - lateral bending: bend the front portion laterally so that the front section m is against the first inclined surface 003, and the rear section n is bent downward by 90° relative to the front section mm to form a first leg A of a π-shaped bending structure;

[0048] Step S4—bending downwardly: bending the first inclined surface 003 together with the bending structure formed in steps S2 and S3 downward synchronously, so that the first inclined surface 003 is inclined downward;

[0049] Step S5 - second downward vertical bend: bend the first inclined surface 003 again to make it vertically face and abut against the first bend 004 to form a connecting surface B of the π-shaped bending structure, and at the same time make the first plane 002 connected thereto form the second leg C of the π-shaped bending structure.

[0050] Specifically, to avoid damage to the sheet material 001 during the bending process, the first angle a between the first inclined surface 003 and the first plane 002 in step S1 is between 10° and 30°; the second angle b between the first inclined surface 003 and the first plane 002 in step S4 is between 130° and 150°. In this embodiment, the first angle a is 20°, and the second angle b is 140°.

[0051] like Figure 1 As shown, the present invention decomposes the overlapping bending structure between the connecting surface B and the first leg A and the second leg C in the π-shaped bending into two bending actions with smaller angles, which can not only reduce the stress concentration in the sheet material 001 during each bending action, avoid cracks and damage 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 of the mold and the manufacturing cost, 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 the same type of products, and has great promotion value.

[0052] In a specific application embodiment of the above molding process, Figure 3-7As shown, the molding mold of 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, the second mold 200, the third mold 300, the fourth mold 400 and the fifth mold 500 are stamping molds respectively used to complete step S1, step S2, step S3, step S4 and step S5 in the above-mentioned molding process.

[0053] like Figure 3 As 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 portion and the side wall of the first upper mold plate 110 are respectively adapted to the sheet material 001, the first plane 002 and the first bend 004, the first upper forming punch 120 is arranged beside the first upper mold plate 110 and its lower end portion is adapted to the first inclined surface 003, and the first upper forming punch 120 can translate relative to the first upper mold plate 110 along the mold closing direction under the action of an external force; the lower mold of the first mold 100 is provided with a first lower mold plate 130, a first lower mold plate 140 and a first lower mold plate 150. The stripping plate 140 and the first lower forming punch 150, the first lower template 130 is fixedly connected to the first lower stripping plate 140 and its upper end is adapted to the sheet material 001, one end of the first lower stripping plate 140 extends to the outside of the first lower template 130 and is adapted to the first plane 002, 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 also provided with a first upper mold base 160, a first lower stopper 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 stopper 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 stopper 170 is arranged on the side wall of the first lower forming punch 150 facing away from the first lower mold plate 130.

[0054] like Figure 3As shown, when the mold is closed, the first upper mold plate 110 and the first lower mold plate 130 first press the sheet 001 to remain motionless. Under the action of the first upper limit member, the first upper forming punch 120 continues to move downward under the push of the mold closing force, and cooperates with the first lower forming punch 150 and the first lower stripping plate 140 to form the first plane 002, the first bend 004 and the first inclined surface 003 on the sheet 001, and at the same time presses the first lower mold plate 130 against the first lower mold seat 180; when the mold is opened, the first upper mold seat 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 seat 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 to separate from the first lower forming punch 150. During the process, the first lower stopper 170 can limit the displacement of the first lower forming punch 150 to ensure the forming accuracy. In this embodiment, the first upper limit member and the first lower limit member are both nitrogen springs.

[0055] like Figure 4 As 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, a second lower template 250 and a 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 block 280 and a second outer release plate 290: the second upper mold base 270 is fixedly connected to the second upper stop block 280 and the second bending knife 230 and is slidably connected to the second upper release plate 220 through a second upper limit member extending along the mold closing direction; the second upper stop block 280 is arranged on the side wall of the second bending knife 230 away from the second forming punch; the second outer release plate 290 is arranged below the second upper stop block 280 and the second bending knife 230 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 290 is arranged on the side wall of the second forming punch away from the second lower template 250.

[0056] like Figure 4As shown, when the mold is closed, the first upper mold plate 210, the second upper stripping plate 220 and the second lower stripping plate 240 first press the sheet 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 stripping plate 290 to move downward, and cooperates 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 stripping plate 220 and the second upper mold plate 210 temporarily press the semi-finished product under the action of the second upper limit member, and the upper mold moves up a certain distance and pulls the second upper stripping plate 220 and the second upper mold plate 210 away from the product and the lower mold, and the second lower limit member pushes the second lower mold plate 250, the second lower stripping plate 240 and the second outer stripping 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.

[0057] like Figure 5 As 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 with 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 molding insert 370, a third side push plate 380 and a third molding punch 390. The third lower stripping plate 360 ​​and the third lower mold The plate 350 is fixedly connected and its end portion facing the third upper pressure plate 340 extends to the outside of the third lower template 350. The upper ends of both are adapted to the semi-product formed by the second mold 200. The third molding insert 370 is arranged on the side wall of one end portion of the third lower release plate 360 ​​and its side wall is adapted to the front section m. The third molding punch 390 is arranged on the side of the third molding insert 370 and its upper end portion and side wall are adapted to the rear section n and the front section m respectively. The third molding 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 pressure 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 on the side of the third forming punch 390 and extends horizontally. The third slider 33 is slidably arranged on the third slide 32. A third mounting groove and an inclined third side push slide are respectively formed on the 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.

[0058] like Figure 5As shown, when the mold is closed, the third upper stripping plate 320, the third upper template 330 and the third lower template 350 press the sheet 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 each other to bend on the front section m of the semi-finished product to form the first foot A. 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 slideway 32, so that the third forming punch 390 leaves the third forming insert 370, and then the upper mold drives the third upper stripping 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 stripping 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.

[0059] like Figure 6 As shown, the upper mold of the fourth mold 400 is provided with a fourth upper mold plate 410, a fourth upper stripping plate 420 and a fourth bending knife 430, the fourth upper mold plate 410 is fixedly connected to the fourth upper stripping plate 420 and its lower end is adapted to the semi-finished product formed by the third mold 300, the fourth bending knife 430 is arranged 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 stripping plate 460, one end of the fourth lower mold plate 450 extends to the outside of the fourth lower stripping plate 460 and its upper end is adapted to the semi-finished product formed by the third mold 300. In this embodiment, a fourth upper mold base 470 and a fourth upper baffle plate 480 are also provided on the fourth mold 400. The fourth upper baffle plate 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.

[0060] like Figure 6 As shown, when the mold is closed, the fourth upper mold plate 410, the fourth upper stripping plate 420 and the fourth lower stripping plate 460 press the sheet material, and the fourth bending knife continues to move downward under the continuous action of the mold closing force, and the front part of the first inclined surface is bent downward. In this embodiment, the fourth upper limit member and the fourth lower limit member are both nitrogen springs.

[0061] like Figure 7As 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 arranged 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 molding insert 550, a fifth shaping insert 560, and a fifth shaping insert 570. 60 and the insert knife 570, the fifth forming insert 550 is arranged directly below the fifth bending knife 530 and fixed on the lower mold, the fifth insert knife 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 slidably arranged at the lower end of the fifth lower mold plate 540 and its one end facing the fifth forming insert 550 is adapted to the connecting surface B and the first leg A, the fifth lower mold plate 540 is movably mounted on the lower mold and can be translated relative to the insert knife 570 along the mold closing direction under the action of external force. In the present embodiment, a fifth lower clamping plate 580, a fifth slideway 590 and a fifth slider 51 are further provided on the lower die of the fifth die 500. The fifth lower clamping plate 580 is fixedly connected to the fifth lower template 540 and is movably connected to the lower die through a fifth lower limit member extending in the mold closing direction. A fifth slideway 590 extending horizontally is provided on the fifth lower clamping plate 580. The fifth slider 51 is slidably mounted on the fifth slideway 590. A fifth inclined surface 52 is provided on one side wall of the fifth slider 51. 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 away from the inserting knife 570. A fifth upper stopper 53 is further fixedly provided on the upper die of the fifth die 500 beside the fifth bending knife 530. A fifth lower stopper 54 is further fixedly provided on the lower die below the fifth upper stopper 53. The fifth lower stopper 54 is provided beside the side of the fifth molding insert 550 away from the fifth shaping insert 560.

[0062] like Figure 7 As shown, when the mold is closed, the fifth upper template 510, the fifth upper stripping plate 520 and the fifth lower template 540 press the sheet 001, and the fifth bending knife 530 continues to move downward under the continuous action of the mold closing force, and cooperates with the fifth molding insert 550 to bend the first inclined surface 003 to form a vertical connection surface B. Synchronously, the fifth lower template 540 pushes the fifth slider 51 downward, and the fifth slider 51 slides relative to the fifth inserting knife 570, pushing the fifth shaping insert 560 to translate relative to the fifth lower template 540 to support the connection surface B and the inner wall of the first leg A. In this embodiment, the first upper limit member and the first lower limit member are both nitrogen springs.

[0063] A limit piece is provided on the upper die seat / lower die seat of the punch 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 technicians in this field, and its specific structure will not be elaborated here.

[0064] The above does not limit the technical scope of the present invention in any way. 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 process of the π-shaped bending structure on the back panel of a large TV is characterized in that: The steps are as follows: Step S1-bending upwardly: forming a first inclined surface at one end of the first plane on the sheet material, and simultaneously forming a first bend bending upwardly by 90° at the intersection of the first inclined surface and the first plane; Step S2—first downward vertical bending: bending the first inclined surface downward from the middle so that the front portion thereof faces vertically downward; Step S3—lateral bending: bending the front portion laterally so that the front section thereof abuts against the first inclined surface, and the rear section thereof is bent downward by 90° relative to the front section to form a first leg of the π-shaped bending structure; Step S4—bending downwardly: bending the first inclined surface together with the bending structure formed in steps S2 and S3 downward synchronously, so that the first inclined surface is inclined downward; Step S5—second downward vertical bend: bend the first inclined surface again so that it is vertically oriented toward and abuts against the first bend to form a connecting surface of the π-shaped bending structure, and at the same time make the first plane connected thereto form a second leg of the π-shaped bending structure.

2. The molding process according to claim 1, characterized in that: In step S1 , a first angle between the first inclined surface and the first plane is between 10° and 30°; and in step S4 , a second angle between the first inclined surface and the first plane is between 130° and 150°.

3. The forming mold 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, the second mold, the third mold, the fourth mold and the fifth mold are stamping molds for completing step S1, step S2, step S3, step S4 and step S5 as claimed in claim 1, respectively, wherein: The upper die of the first die is provided with a first upper die plate and a first upper forming punch, the lower end portion and the side wall of the first upper die plate are respectively adapted to the sheet material, the first plane and the first bend, the first upper forming punch is provided beside the first upper die plate and the lower end portion thereof is adapted to the first inclined surface, and the first upper forming punch can be translated relative to the first upper die plate along the mold closing direction under the action of an external force; the lower die of the first die is provided with a first lower die plate, a first lower stripping plate and a first lower forming punch, the first lower die plate is fixedly connected to the first lower stripping plate and the upper end portion thereof is adapted to the sheet material, a first lower stripping plate The end of the first lower template extends to the outside of the first lower template and is adapted to the first plane. The first lower forming punch is matched and arranged below the first upper forming punch and is arranged beside the first lower template. The first lower template and the first lower stripping plate can be translated relative to the first lower forming punch along the mold closing direction under the action of external force. When the mold is closed, the first upper template and the first lower template first press the sheet material, and the first upper forming punch continues to move downward under the continuous action of the mold closing force, and cooperates with the first lower forming punch and the first lower stripping plate to form the first plane, the first bend and the first inclined surface on the sheet material; The upper die of the second die is provided with a second upper die plate, a second upper stripping plate and a second bending knife, the second upper die plate is fixedly connected to the second upper stripping plate and the lower end thereof is adapted to the semi-finished product formed by the first die, the second bending knife extends along the mold closing direction and is arranged beside the second upper stripping plate, and the second bending knife can translate relative to the second upper die plate along the mold closing direction under the action of an external force; the lower die of the second die is provided with a second lower stripping plate, a second lower die plate and a second lower forming punch, the second lower stripping plate is arranged at the upper end of the second lower die plate, one end of the second lower die plate extends to the outer side of the second lower stripping plate, and the upper ends of the two are adapted to the semi-finished product formed by the first die, the second lower forming punch is fixedly arranged beside the second lower die plate and beside the second bending knife, and the upper end and one side end thereof are adapted to the front and rear of the first inclined surface respectively; when the mold is closed, the second upper stripping plate and the second lower stripping plate first press the sheet material, and the second bending knife continues to move downward under the continuous action of the mold closing force, and cooperates with the second forming punch to bend the first inclined surface for the first time; The upper die of the third mold is provided with a third upper die seat, a third upper stripping plate, a third upper die plate and a third upper pressing plate. The third upper die plate is provided on the third upper stripping plate and is slidably connected with the third upper die seat through a third upper limit piece extending along the mold closing direction. The lower end portion 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 die plate; the lower die of the third mold is provided with a third lower die 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 is fixedly connected to the third lower die plate and its end portion facing the third upper pressing plate extends to the outside of the third lower die plate. The upper ends of both are adapted to the semi-finished product formed by the second mold. The third forming insert is arranged on a side wall of one end of the third lower stripping plate and its side wall is adapted to the front section, the third forming punch is arranged beside the third forming insert and its upper end and side wall are adapted to the rear section and the front section respectively, the third forming punch is arranged on a side wall of the third side push plate and is transmission-connected thereto, the other side wall of the third side push plate is formed with a third inclined surface, and the third inclined surface is arranged below the third upper pressing plate; when the mold is closed, the third upper stripping plate and the third lower template press the sheet material, and at the same time, the third upper pressing plate pushes the third side push plate to slide on the lower mold, so as to push the third forming punch to cooperate with the third forming insert to bend in the front section to form the first foot; The upper die of the fourth die is provided with a fourth upper die plate, a fourth upper stripping plate and a fourth bending knife, the fourth upper die plate is fixedly connected to the fourth upper stripping plate and the lower end thereof is adapted to the semi-finished product formed by the third die, the fourth bending knife is provided on the side of the fourth upper die plate and can be translated relative to the fourth upper die 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 on the side wall facing the fourth upper die plate; the lower die of the fourth die is provided with a fourth lower die plate and a fourth lower stripping plate, one end of the fourth lower die plate extends to the outside of the fourth lower stripping plate and the upper end thereof is adapted to the semi-finished product formed by the third die; when the mold is closed, the fourth upper die plate, the fourth upper stripping plate and the fourth lower stripping plate press the sheet material, and the fourth bending knife continues to move downward under the continuous action of the mold closing force to bend the front part of the first inclined surface obliquely downward; The upper die of the fifth die is provided with a fifth upper die plate, a fifth upper stripping plate and a fifth bending knife. The fifth upper die plate is fixedly connected to the fifth upper stripping plate and its lower end portion is adapted to the semi-finished product formed by the fourth die. The fifth bending knife is arranged beside the fifth upper die plate and can slide relative to the fifth upper die plate along the mold closing direction under the action of external force. The lower die of the fifth die is provided with a fifth lower die plate, a fifth forming insert, a fifth shaping insert and an inserting knife. The fifth forming insert is arranged directly below the fifth bending knife and fixedly mounted on the lower die. The fifth inserting knife is fixedly mounted on the lower die. The side wall of its upper end is transmission-connected to the fifth shaping insert. The fifth shaping insert is slidingly arranged at The lower end of the fifth lower template and one end thereof facing the fifth forming insert are matched with 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 move downward continuously, 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.

4. The molding die according to claim 3, characterized in that: 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 wall of the first lower forming punch away from the first lower mold plate.

5. The molding die according to claim 3, characterized in that: The second mold is also provided with a second upper mold base, a second upper stopper and a second outer release plate: the second upper mold base is fixedly connected to the second upper stopper 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 stopper is arranged on the side of a side wall of the second bending knife away from the second forming punch; the second outer release plate is arranged below the second upper stopper 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 a side wall of the second forming punch away from the second lower template.

6. The molding die according to claim 3, characterized in that: A third slide and a third slider are also provided on the lower die 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. A third mounting groove and an inclined third side push slide are respectively formed on 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.

7. The molding die according to claim 3, characterized in that: The fourth mold is also provided with a fourth upper mold base and a fourth upper baffle plate. The fourth upper baffle plate 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 limit member.

8. The molding die according to claim 3, characterized in that: The lower die of the fifth mold is also provided with a fifth lower clamping plate, a fifth slideway and a fifth slider. The fifth lower clamping plate is fixedly connected to the fifth lower template and movably connected to the lower die through a fifth lower limit member extending in the mold closing direction. The fifth lower clamping plate is provided with the fifth slideway extending horizontally, and the fifth slider is slidably mounted on the fifth slideway. 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 away from the inserter.

9. The molding die according to claim 8, characterized in that: The upper die of the fifth mold is also fixedly provided with a fifth upper stopper on the side of the fifth bending knife, and the lower die is also fixedly provided 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.

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