Forming die structure of curved screen back plate

Abstract

The utility model relates to a curved screen backboard forming die structure which is characterized in that the curved screen backboard forming die structure comprises an upper die and a lower die which are used for stamping to form a curved metal backboard, the upper surface of the lower die is in a concave arc shape to form an outer curved surface of the metal backboard, and the lower surface of the upper die is in a convex arc shape to form an inner curved surface of the metal backboard. The upper surface of the lower die is provided with a groove into which the first end of the stud extends, and the lower surface of the upper die is provided with a convex column for riveting the second end of the stud into a sunk groove hole in the upper part of the metal back plate. According to the design of the die, in the using process of the die, a metal back plate to be stamped can be placed on the lower die firstly, then the first end of the stud penetrates through the sinking groove hole from the inner curved surface to one side of the outer curved surface and extends into the groove of the lower die, and the stud is placed into the sinking groove hole stably and is not prone to deviation; therefore, the stud can be pre-installed on the metal backboard conveniently and quickly, accuracy and stability are high, and the situation that the stud is inconvenient and unstable to install is avoided.

Description

Technical fields:

[0001] This utility model relates to a mold structure for forming a curved screen back panel. Background technology:

[0002] With the increasing production and use of curved LCD screens, studs are installed on the upper part of the back panel of the curved screen. These studs are used to fix the back plastic shell of the curved LCD screen by screwing them together. Currently, welding, riveting, or bolting are commonly used to install these studs. Welding or bolting requires more processing steps and has low production efficiency, so riveting has become the preferred method. However, the riveting surface between the stud and the metal back panel is currently located on the outer curved surface of the back panel of the curved screen, which can easily lead to problems with weak anchoring.

[0003] To avoid the problem of loose riveting between the stud and the outer curved surface of the metal backing plate, the stud can be riveted into the countersunk hole of the metal backing plate. Specifically, the first end of the stud should face upwards and pass through the inner curved surface of the metal backing plate towards the outer curved surface, then be riveted (e.g., ...). Figure 6 As shown in the figure, during the stamping process, it is necessary to first place the stud in the slot of the lower die (this slot is equivalent to pre-positioning the stud, but since the stud needs to be riveted to the metal back plate, the contact area between the stud and the slot is small or even non-existent), and then place the metal back plate. During the placement process, the countersunk hole on the metal back plate needs to be aligned with the stud. Because the contact area between the stud and the slot is small, the stud is prone to deviation, which makes it inconvenient to place the metal back plate, thus affecting processing efficiency and assembly line operation.

[0004] Currently, a Chinese patent, "A Stamping Device for LED Display Back Panel Production," publication number CN222403289U, has been found. This stamping device for LED display back panel production includes multiple stamping units and a transmission unit. A transmission component is provided on the front side of the transmission unit, and a placement frame for limiting the position of the display back panel is fixedly connected to the front side of the transmission unit. A support base is fixedly connected to the front side of the transmission component. This patent is beneficial for automatically placing rivets and reducing the burden on workers, but it cannot solve the problem that studs are prone to deviation and that it is inconvenient to place metal back panels. Summary of the Invention:

[0005] In view of the problems existing in the prior art, the purpose of this utility model is to propose a curved screen back panel forming mold structure. The curved screen back panel forming mold structure is reasonably designed and facilitates the installation of studs on the curved screen back panel.

[0006] This utility model is implemented using the following solution.

[0007] The present invention relates to a curved screen back panel forming mold structure, characterized in that: it includes an upper mold and a lower mold for stamping to form a curved metal back panel, wherein the upper surface of the lower mold is concave arc to form the outer curved surface of the metal back panel, the lower surface of the upper mold is convex arc to form the inner curved surface of the metal back panel, the upper surface of the lower mold is provided with a groove for the first end of a stud to extend into, and the lower surface of the upper mold is provided with a protrusion for riveting the second end of the stud into the upper countersunk hole of the metal back panel.

[0008] Furthermore, the metal back plate formed by the die stamping has multiple reinforcing ribs, and the two lower corners of the metal back plate are provided with protrusions facing the inner side of the curved surface. These protrusions are used to support the corners of the light guide film in the liquid crystal display, and the protrusion height of the protrusions is consistent with that of the reinforcing ribs. The upper surface of the lower die is provided with a boss for forming the protrusions of the metal back plate, and the lower surface of the upper die is provided with a recess for forming the protrusions of the metal back plate.

[0009] Furthermore, the upper surface of the lower mold is provided with a protrusion for forming multiple reinforcing ribs of the metal back plate, and the lower surface of the upper mold is provided with a recess for forming multiple reinforcing ribs of the metal back plate.

[0010] Furthermore, the protrusion formed by the die stamping is in the shape of a right triangle, with the two right-angled sides of the right triangle protrusion located on the side and bottom edge of the metal back plate, respectively.

[0011] Furthermore, the protrusion height of the protrusion formed by the die stamping and the reinforcing rib is 3-7mm.

[0012] Furthermore, the length of the two right-angled sides of the protrusion formed by the die stamping is 1-5 cm.

[0013] Furthermore, the reinforcing ribs formed by the die stamping process include an outer annular reinforcing rib and several strip-shaped reinforcing ribs arranged along the length of the metal back plate and surrounding the inner side of the outer annular reinforcing rib.

[0014] Furthermore, the outer annular reinforcing ribs formed by die stamping have spacer bands on the four sides of the metal back plate, and the protrusions are disposed in the spacer bands and located at the lower corner of the metal back plate.

[0015] Furthermore, the upper part of the aforementioned metal back plate is provided with a stud for locking screws of external components. The first end of the stud has an opening and an internal thread on the opening. The second end of the stud has a closing plate larger than the diameter of the stud. The outer periphery of the closing plate has serrations. The closing plate is riveted into the countersunk hole in the upper part of the metal back plate. The countersunk hole is located on one side of the inner curved surface of the metal back plate.

[0016] Furthermore, the first end of the aforementioned stud protrudes from the outer curved surface of the metal backing plate.

[0017] With the mold design described above in this application, during the use of the mold, the metal back plate to be stamped can be placed on the lower mold first, and then the first end of the stud can be passed through the countersunk hole from the inner curved surface to the outer curved surface and extended into the groove of the lower mold. Since the stud is relatively stable when placed in the countersunk hole, it is not easy to deviate. Thus, the pre-installation of the stud on the metal back plate is convenient, quick, accurate and stable, avoiding the situation of inconvenient and unstable stud installation. Attached image description:

[0018] The present invention will be further described below with reference to the accompanying drawings;

[0019] Figure 1 It is a three-dimensional view of the metal back panel from one perspective;

[0020] Figure 2 This is a three-dimensional view of the metal back panel from another perspective;

[0021] Figure 3 This is a partial cross-sectional view of the metal back plate;

[0022] Figure 4 This is a partial view of the metal back panel;

[0023] Figure 5 This is a cross-sectional structural diagram of the mold used in this application;

[0024] Figure 6 This is a schematic diagram of the cross-sectional structure of a counterexample of a mold. Detailed implementation method:

[0025] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0026] The metal back plate 1 produced by the mold has multiple reinforcing ribs 2. The two lower corners of the metal back plate are provided with protrusions 3 facing the inner side of the curved surface. The protrusions 3 are used to support the corners of the light guide film in the liquid crystal display. The protrusions 3 have the same protrusion height as the reinforcing ribs 2.

[0027] Because the protrusion 3 is provided on the metal back plate, the metal back plate can support the corner of the light guide film, so that the lower corner of the light guide film in the LCD curved screen using the metal back plate 1 can fit with the corner of the light guide plate, avoiding large gaps between the two and avoiding the problem of dark areas.

[0028] The reason for the large gap between the light guide film and the corner of the light guide plate is that during the time between the production and consumer use of the LCD curved screen, it is usually flat during transportation and storage. Under the action of gravity, a gap is generated between the corner of the light guide film and the corner of the light guide plate, resulting in dark areas.

[0029] The reason why the protrusions 3 are only provided at the two lower corners of the metal back plate is that the dark area does not appear at the upper corner of the LCD curved screen. Since the upper edge of the LCD curved screen is provided with a light strip module (the light strip module is located between the upper edge of the LCD curved screen and the upper part of the outer ring reinforcing rib 201), the light strip module plays a supporting role.

[0030] Preferably, the protrusion can be a right triangle, with the two right-angled sides of the protrusion located on the side 101 and bottom 102 of the metal back plate, respectively (the length of the two right-angled sides of the protrusion is 1-5 cm); or the protrusion can be a fan shape, with the two sides of the fan being the side and bottom of the metal back plate (the length of the two right-angled sides of the protrusion is 1-5 cm); or the protrusion can be a circle, rectangle, or ring, etc., and the circular, rectangular, or ring-shaped protrusion can be connected to or not connected to the side or bottom of the metal back plate.

[0031] The protrusion height of the raised part and the reinforcing rib can be 3-7mm.

[0032] The specific reinforcing rib 2 includes an outer annular reinforcing rib 201 and several strip-shaped reinforcing ribs 202 arranged along the length of the metal back plate and surrounding the inner side of the outer annular reinforcing rib. There are intervals between the strip-shaped reinforcing ribs 202 and between the strip-shaped reinforcing ribs 202. The outer annular reinforcing rib 201 and the strip-shaped reinforcing ribs 202 can be of equal or unequal width. By setting the outer annular reinforcing rib 201 and several strip-shaped reinforcing ribs 202, the overall shape stability of the metal back plate 1 can be enhanced.

[0033] The outer annular reinforcing rib 201 is spaced with the four sides of the metal back plate by a spacer band 106, and the protrusion is disposed in the spacer band and located at the lower corner of the metal back plate.

[0034] A stud 4 for locking screws to external components (such as the plastic shell on the back of a curved LCD screen) is provided on the upper part of the metal back plate 1. The first end of the stud 4 has an opening and an internal thread 401. During installation, a screw is inserted into the countersunk hole of the external component and connected to the internal thread 401. The second end of the stud has a closing plate 402 larger than the diameter of the stud. The closing plate 402 can be circular, rectangular, or elliptical, but is preferably circular. The outer periphery of the closing plate has serrations 403 (the serrations 403 are located at the countersunk hole 10). After the groove of 3 is riveted, it has better torque resistance. The sealing piece 402 is riveted in the groove of the groove hole 103 on the upper part of the metal back plate. The groove of the groove hole 103 is located on the inner curved surface of the metal back plate 1. Since the sealing piece 402 is riveted in the groove of the groove hole 103 on the upper part of the metal back plate, and the outer periphery of the sealing piece is provided with serrations 403, the connection between the stud 4 and the metal back plate 1 can be more stable and reliable, and it is not easy for the stud 4 to fall off the outer curved surface of the metal back plate 1.

[0035] For ease of use and strong screw fastening force, the first end of the stud 4 protrudes from the outer curved surface 104 of the metal back plate (allowing for a longer screw connection length with the screw), and a stepped ring 404 is provided around the opening at the first end of the stud (this stepped ring allows for a longer screw connection length with the screw and better contact with the plastic shell on the back of the LCD curved screen).

[0036] The above describes the structure of the metal backplate formed by stamping using a curved screen backplate forming mold. The following describes in detail the key modifications made to the mold in this application.

[0037] This utility model relates to a curved screen back panel forming mold structure, which includes an upper mold A1 and a lower mold A2 for stamping to form a curved metal back panel. The upper surface of the lower mold A2 is concave arc-shaped to form the outer curved surface 104 of the metal back panel, and the lower surface of the upper mold A1 is convex arc-shaped to form the inner curved surface 105 of the metal back panel. The upper surface of the lower mold is provided with a groove A3 for the first end of the stud 4 to extend into, and the lower surface of the upper mold is provided with a protrusion A4 for riveting the second end of the stud into the upper recessed hole of the metal back panel.

[0038] The above-described mold structure facilitates the stamping formation of curved metal back plates. Furthermore, since the lower surface of the upper mold A1 is convex and the upper surface of the lower mold A2 is concave, the first end of the stud 4 can be inserted downward into the groove A3 on the upper surface of the lower mold during the stamping process. This allows the closing piece 402 of the stud 4 to be riveted into the groove of the countersunk hole 103 in the metal back plate, which helps ensure the reliability of the stud 4 riveting.

[0039] If the upper and lower dies are designed in opposite ways, with the lower surface of the upper die being concave and the upper surface of the lower die being convex, then to achieve the riveting of the stud 4 to the outer curved surface 104 of the metal backing plate, the stud 4 and the outer curved surface of the metal backing plate can only be directly riveted, resulting in an unstable riveting connection. To adapt to this design of the upper and lower dies and to avoid the problem of an unstable riveting connection between the stud 4 and the outer curved surface of the metal backing plate, the above problem can be overcome by riveting the stud 4 into the countersunk hole 103 of the metal backing plate, that is, the first end of the stud 4 faces upward and exits from the inner curved surface of the metal backing plate. The 105 is inserted through the outward curved surface 104 and then riveted. During the stamping process, a stud needs to be placed in the recess of the lower die first (this recess is equivalent to pre-positioning the stud, but because the stud needs to be riveted to the metal backing plate, the contact area between the stud and the recess is small or even nonexistent). Then, the metal backing plate is placed on top. During placement, the countersunk holes on the metal backing plate need to be aligned with the stud. Due to the small contact area between the stud and the recess, the stud is prone to misalignment, making it inconvenient to place the metal backing plate, thus affecting processing efficiency and assembly line operation (i.e., as described in the background technology). Figure 6 (As shown in the figure); even if the stud 4 is first inserted into the countersunk hole 103 from bottom to top and then placed into the mold, this operation will still cause the stud 4 to fall due to its own weight, making it inconvenient to carry out the stamping action.

[0040] Using the mold design of this application (the upper surface of the lower mold A2 is concave arc-shaped, the lower surface of the upper mold A1 is convex arc-shaped, the upper surface of the lower mold is provided with a groove A3 for the first end of the stud 4 to extend into, and the lower surface of the upper mold is provided with a protrusion A4 for riveting the second end of the stud into the upper countersunk hole of the metal backing plate), during use, the metal backing plate to be stamped can be placed on the lower mold first, and then the first end of the stud 4 can be passed through the countersunk hole 103 (which can be obtained by stamping in the previous stamping process) from the inner curved surface to the outer curved surface and extended into the groove A3 of the lower mold, so that the stud 4 can be installed conveniently, quickly, accurately and stably.

[0041] Similarly, the upper surface of the lower die is provided with a boss for forming a protrusion of the metal back plate, and the lower surface of the upper die is provided with a recess for forming a protrusion of the metal back plate; the upper surface of the lower die is provided with a protrusion for forming multiple reinforcing ribs of the metal back plate, and the lower surface of the upper die is provided with a recess for forming multiple reinforcing ribs of the metal back plate; the boss, protrusion, recess, and recess of the die are not shown in the figure, but those skilled in the art will know that in order to form protrusions, reinforcing ribs, and other shapes and structures in stamped products, it is necessary to perform certain processing on the die, so it is not described in detail in this application.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it; although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of this utility model or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the technical solution claimed by this utility model.

Claims

1. A curved screen backboard forming die structure, characterized in that: The upper die and lower die for stamping the curved metal back plate, the upper surface of the lower die is concave to form the outer curve of the metal back plate, the lower surface of the upper die is convex to form the inner curve of the metal back plate, the upper surface of the lower die is provided with a groove for the first end of the stud to extend into, and the lower surface of the upper die is provided with a convex column for riveting the second end of the stud into the upper sink hole of the metal back plate.

2. The curved screen backplane forming die structure of claim 1, wherein: The metal back plate stamped by the die has a plurality of reinforcing ribs, and the two lower end corners of the metal back plate are provided with a protruding part towards the inner side of the curve, which is used to support the corner of the light guide film in the liquid crystal display, and the protruding part has the same height as the reinforcing ribs; the upper surface of the lower die is provided with a convex part for forming the protruding part of the metal back plate, and the lower surface of the upper die is provided with a recess for forming the protruding part of the metal back plate.

3. The curved screen backplane forming mold structure of claim 2, wherein: The upper surface of the lower die is provided with a convex part for forming the plurality of reinforcing ribs of the metal back plate, and the lower surface of the upper die is provided with a recess for forming the plurality of reinforcing ribs of the metal back plate.

4. The curved screen backplane forming mold structure of claim 3, wherein: The protruding part stamped by the die has a shape of a right triangle, and the two right angle sides of the right triangle protruding part are respectively arranged on the side and the bottom of the metal back plate.

5. The curved screen backplane forming mold structure of claim 4, wherein: The protruding part stamped by the die has a height of 3-7mm. 6.The forming die structure of the curved screen backboard according to claim 5, characterized in that: The length of the two right angle sides of the protruding part stamped by the die is 1-5cm.

7. The curved screen backplane forming mold structure of claim 6, wherein: The reinforcing rib stamped by the die includes an outer ring-shaped reinforcing rib and a plurality of strip-shaped reinforcing ribs arranged along the length direction of the metal back plate inside the outer ring-shaped reinforcing rib. 8.The forming die structure of the curved screen backboard according to claim 7, characterized in that: The outer ring-shaped reinforcing rib stamped by the die has a spacing belt with the four edges of the metal back plate, and the protruding part is arranged in the spacing belt and located at the lower end corner of the metal back plate. 9.The forming die structure of the curved screen backboard according to claim 8, characterized in that: The upper part of the metal back plate is provided with a stud for locking the screw of the external device, the first end of the stud is provided with a hole and an internal thread on the hole, the second end of the stud is provided with a closing piece larger than the diameter of the stud, the outer periphery of the closing piece is provided with a sawtooth, and the closing piece is riveted in the sink of the sink hole of the upper part of the metal back plate. 10.The forming die structure of the curved screen backboard according to claim 9, characterized in that: The first end of the stud protrudes from the outer curve of the metal back plate.

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