3D glass hot bending mold structure

Abstract

The 3D glass hot bending mold structure comprises a lower mold, an upper mold and a positioning insert, the lower mold comprises a plurality of bending lines arranged in the width direction, inwards-concave mold cavities are formed from the bending lines to the two sides, and the upper portions of the mold cavities are open and used for containing glass blanks; the upper die is used for sealing an opening above the die cavity, and a convex module matched with the upper surface of the die cavity is formed on the lower surface of the upper die; and the lower die is also provided with a downward concave groove on the bending line of the die cavity, and the groove is used for placing the positioning inserts with different thicknesses so as to adjust the height of the positioning inserts protruding out of the groove. A 2D glass blank is placed between the upper die and the lower die, when the 2D glass blank is heated to a certain degree, the glass blank is softened, the thicknesses of the positioning inserts are different, and due to the existence of the inclination angle, the glass blank slightly slides at the moment, so that the gravity center deviation of the glass blank is corrected. According to different bending lengths of two sides of the glass blank, the thickness of the positioning insert is preset, so that the glass blank can be normally formed.

Description

Technical Field

[0001] This specification relates to the technical field of glass processing, and in particular to a 3D glass hot bending mold structure. Background Art

[0002] Bent glass is made by heating and softening flat glass, forming it in a mold, and then annealing it to create a curved surface. With industrial advancements and rising living standards, bent glass is increasingly used in architectural and residential applications. During the 3D glass production process, 2D glass must undergo heat treatment. The current conventional bending process is: 2D glass → placement in a graphite mold → bending.

[0003] During the aforementioned process, 3D glass bending is performed under high-temperature and high-pressure conditions, reaching temperatures as high as 770°C. For irregularly shaped glass with varying bend lengths, the bent 3D glass can exhibit unstable forming conditions such as misalignment and yaw. Depending on the forming conditions, mold rework or redesign is required. This leads to mold design revisions, increased processing time, and consumables costs, reducing process efficiency and increasing costs. Furthermore, stable forming requires extensive design revisions to ensure process stability, which lengthens the development cycle. For example, Chinese patent CN217781017U discloses a curved glass hot bending mold, which includes a lower mold, an upper mold and a high-temperature resistant elastic part; the lower mold is formed with a concave mold cavity, and the upper end of the mold cavity is open; the upper mold is used to close the upper end opening of the mold cavity, and the lower surface of the upper mold has a protrusion adapted to the mold cavity. The glass embryo can be placed in the mold cavity and is located between the protrusion of the upper mold and the bottom wall of the mold cavity. When the upper mold and the lower mold are closed, the protrusion falls into the mold cavity; the high-temperature resistant elastic part is connected between the upper mold and the lower mold and is used to support the upper mold. As the temperature rises, the elastic supporting force of the high-temperature resistant elastic part decreases. Utility Model Content

[0004] One or more embodiments of the present specification provide a 3D glass hot bending mold structure for solving the following technical problems: the 3D glass hot bending molds used in the prior art have a long development cycle and waste of processing consumables, resulting in low efficiency of the entire hot bending process development, high overall development costs, and a long cycle.

[0005] One or more embodiments of this specification adopt the following technical solutions:

[0006] The utility model provides a 3D glass hot bending mold structure, comprising:

[0007] The lower mold includes a plurality of bending lines arranged along the width direction, and a concave mold cavity is formed on both sides of the bending lines. The upper part of the mold cavity is open and is used to place the glass blank;

[0008] An upper mold is used to close the opening above the mold cavity, and a raised module is formed on the lower surface of the upper mold to cooperate with the upper surface of the mold cavity;

[0009] Positioning insert, the lower die is also provided with a downwardly concave groove on the bending line of the die cavity, which is used to place positioning inserts of different thicknesses to adjust the height of the positioning insert protruding from the groove.

[0010] In some embodiments, along the length direction of the lower mold, the heights at which two adjacent positioning inserts protrude from the groove are different, so that the glass blank is tilted between two adjacent bending lines.

[0011] In some embodiments, the lower mold is formed with a long bending side and a short bending side between two adjacent bending lines, and the glass blank is inclined downward from the short bending side to the long bending side.

[0012] In some embodiments, the mold cavity is provided with a plurality of positioning posts along the opposite directions of the length thereof, for limiting the positions of both sides of the glass blank in the width direction.

[0013] In some embodiments, the upper mold and the lower mold are made of graphite or high-temperature alloy.

[0014] In some embodiments, a ventilation groove is provided on the upper surface of the lower mold, and the ventilation groove connects the mold cavity and the outside.

[0015] In some embodiments, the bottom surface of the lower mold is processed with a strip groove along the pushing direction of the hot bending mold.

[0016] In some embodiments, the upper surface of the groove gradually slopes upward along the advancing direction of the hot bending mold.

[0017] In some embodiments, the grooves include at least two grooves in a direction perpendicular to the pushing direction of the hot bending mold, and the at least two grooves are arranged in parallel.

[0018] The utility model provides a 3D glass hot bending mold structure, comprising: a lower mold, an upper mold, and a positioning insert. The lower mold includes a plurality of bending lines arranged along the width direction, and a concave mold cavity is formed on both sides from the bending lines. The upper opening of the mold cavity is configured to accommodate a glass blank. The upper mold is used to close the opening above the mold cavity. The lower surface of the upper mold is formed with a protruding module that cooperates with the upper surface of the mold cavity. The lower mold is also provided with a downwardly concave groove on the bending line of the mold cavity for accommodating positioning inserts of different thicknesses to adjust the height of the positioning insert protruding from the groove. A 2D glass blank is placed between the upper and lower molds. Under the weight of the upper mold, the glass blank is initially unable to move. When heated to a certain degree, the glass blank softens. Due to the different thicknesses of the positioning inserts, the height of the protrusion from the groove also varies. Due to the tilt angle, the glass blank will slide slightly to correct the deviation of the glass blank caused by the offset of the center of gravity. The thickness of the positioning insert is pre-set according to the different bending lengths of the glass blank on both sides of the bending line, so that the glass blank can be properly formed into the desired shape. This can ensure the hot bending of 3D glass curved surface effects and effectively optimize the deviation defects of glass forming, thus making glass hot bending possible. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of this specification or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are only some of the embodiments described in this specification. For those skilled in the art, other drawings can be obtained based on these drawings without inventive work. In the drawings:

[0020] Figure 1 A schematic top view of the upper mold of a 3D glass bending mold structure provided by an embodiment of the present invention;

[0021] Figure 2 for Figure 1 The schematic diagram of the upper mold of the provided 3D glass bending mold structure as viewed from above;

[0022] Figure 3 for Figure 1 A bottom view schematic diagram of the lower mold of the provided 3D glass hot bending mold structure is shown;

[0023] Figure 4 A schematic diagram of a first structural embodiment of a positioning insert of a 3D glass bending mold structure provided by the present utility model;

[0024] Figure 5 A second structural schematic diagram of the positioning insert of the 3D glass bending mold structure provided by an embodiment of the present utility model;

[0025] Figure 6A third schematic diagram of the positioning insert of the 3D glass bending mold structure provided by an embodiment of the present invention;

[0026] Figure 7 A fourth schematic diagram of a positioning insert of a 3D glass bending mold structure provided by an embodiment of the present invention;

[0027] Figure 8 A schematic diagram of the glass blank provided by an embodiment of the present invention being placed in the lower mold;

[0028] Figure 9 A schematic diagram of the matching state of the upper mold and the lower mold provided in an embodiment of the present utility model.

[0029] The reference numerals are as follows:

[0030] 1. Upper mold; 11. Module; 2. Lower mold; 21. Cavity; 22. Bending line; 221. Bending long side; 222. Bending short side; 23. Positioning column; 24. Groove; 3. Positioning insert; 4. Glass blank. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without making creative efforts are within the scope of protection of this application.

[0032] The following description is provided to enable any person skilled in the art to implement and use the present application. In the following description, details are listed for the purpose of explanation. It should be understood that one of ordinary skill in the art will recognize that the present application can be implemented without using these specific details. In other examples, well-known structures and processes will not be elaborated in detail to avoid obscuring the description of the present application with unnecessary details. Therefore, the present application is not intended to be limited to the embodiments shown, but is consistent with the widest range of principles and features disclosed in the present application.

[0033] The heat-bent glass of the utility model is formed by heating and softening flat glass in a mold and then annealing to form curved glass.

[0034] refer to Figures 1 to 9The 3D glass hot bending mold structure of the present invention includes a lower mold 2, an upper mold 1 and a positioning insert 3. The lower mold 2 includes several bending lines 22 arranged along the width direction, and a concave mold cavity 21 is formed on both sides from the bending line 22. The upper opening of the mold cavity 21 is used to place the glass blank 4; the upper mold 1 is used to close the opening above the mold cavity 21, and the lower surface of the upper mold 1 is formed with a protruding module 11 that cooperates with the upper surface of the mold cavity 21; the lower mold 2 is also provided with a downwardly concave groove 24 on the bending line 22 of the mold cavity 21, which is used to place positioning inserts 3 of different thicknesses to adjust the height of the positioning insert 3 protruding from the groove 24.

[0035] In the solution of this utility model, reference is made to Figure 8 and Figure 9 A 2D glass blank 4 is placed between the upper mold 1 and the lower mold 2. Under the weight of the upper mold 1, the glass blank 4 is initially immobile. When heated to a certain temperature, the glass blank 4 softens. Due to the varying thicknesses of the positioning inserts 3 and the varying heights of their protrusions from the groove 24, the glass blank 4 can slide slightly due to the tilt angle, correcting any misalignment caused by the shift in its center of gravity. The thickness of the positioning inserts 3 is pre-set based on the varying bending lengths of the glass blank 4 from the bend line 22, allowing the glass blank 4 to be properly formed into the desired shape. This ensures a 3D curved glass surface, effectively minimizing misalignment during hot bending, and ultimately enabling glass hot bending.

[0036] refer to Figure 8 Each 3D glass hot bending mold structure can be used to form multiple glass blanks 4. The length direction of the glass blanks 4 is placed along the width direction of the lower mold 2. Each glass blank 4 is placed between two adjacent bending lines 22. The glass blanks 4 are heated to transform from a cold glass state to a thermoplastic state, so that the glass blanks 4 are bent into V-shaped glass.

[0037] The curved glass manufactured by the utility model can be applied to large-screen displays on vehicles or large-scale electronic display screens for daily use, as well as various special-shaped large curved screens that cannot be processed with a whole cover plate.

[0038] In some embodiments, adjacent positioning inserts 3 protrude from the groove 24 at different heights along the length of the lower mold 2, allowing the glass blank 4 to tilt between the two bend lines 22. In the cold state, under the action of gravity of the upper mold 1, the thickness of the positioning inserts 3 varies slightly, preventing the glass blank 4 from sliding.

[0039] refer to Figures 4 to 7In some embodiments, the positioning insert 3 can have four different thicknesses: 2mm, 1mm, 0mm, and -1mm, respectively. The 2D glass bending process can adjust the thickness of the positioning insert based on the actual deviation, ensuring that the 3D glass after bending meets the required drawing specifications.

[0040] In some embodiments, the lower mold 2 is formed with a long curved side 221 and a short curved side 222 between two adjacent bend lines 22. The glass blank 4 tilts downward from the short curved side 222 toward the long curved side 221. Due to the different widths of the two sides of the glass blank 4, the center of gravity of the upper mold 1 is not centered during the heating phase, which can easily lead to misalignment during the molding process. Preemptive adjustment of the glass blank 4's placement can effectively prevent misalignment in the glass's bend area.

[0041] refer to Figure 9 In the cooling state, since the bending area of ​​the glass blank 4 and the shape of the mold cavity 21 are completely consistent, the fitting clearance is a clearance fit. In this way, the curvature of the inner and outer walls of the finally formed curved glass is different. The curvature of the surface of the mold cavity 21 and the module 11 is adjusted as close as possible to the curvature of the finished glass after hot bending to ensure the aesthetics of the 3D curved glass.

[0042] In some embodiments, the mold cavity 21 is provided with a plurality of positioning posts 23 along the longitudinal direction to limit the two sides of the width direction of the glass blank 4. The positioning posts 23 can limit the sliding and displacement of the glass blank 4 along the width direction.

[0043] Understandably, the reference Figure 2 The upper mold 1 is also provided with a positioning groove adapted to the positioning column 23 and a positioning groove adapted to the positioning insert 3 at the corresponding positions of the positioning column 23 and the positioning insert 3, so that the upper mold 1 and the lower mold 2 can fully cooperate when the mold is closed.

[0044] In some embodiments, the upper mold 1 and lower mold 2 are made of graphite or a high-temperature alloy. Graphite or a high-temperature alloy can operate for extended periods in high-temperature environments, exhibiting high red hardness, wear resistance, excellent mechanical properties, and high-temperature oxidation resistance. They resist oxidation and powder shedding at high temperatures, and exhibit excellent surface smoothness after processing, making them ideal materials for glass bending molds.

[0045] In some embodiments, a ventilation groove is provided on the upper surface of the lower mold 2, and the ventilation groove connects the mold cavity 21 and the outside world. As the hot bending mold is heated, the temperature in the mold cavity 21 of the lower mold 2 becomes higher and higher, so the internal air pressure also becomes higher and higher. The ventilation groove can balance the pressure in the mold cavity 21. The ventilation groove extends inward from the outer surface of the lower mold 2 and is connected to the mold cavity 21. In this way, the mold cavity 21 can be connected to the outside world through the ventilation groove to reduce the pressure difference between the mold cavity 21 and the outside world and improve safety. In addition, the ventilation groove can also remove the air in the mold cavity 21 and the gas generated during the heating process, and can also eliminate various defects in the finished product and reduce mold contamination.

[0046] In some embodiments, the bottom surface of the lower die 2 is machined with a strip groove 24 along the direction of the bending die's push. When the entire bending die is pushed into the bending machine, the bottom of the bending die (that is, the bottom plate of the lower die 2) contacts the inner bottom wall of the bending machine. If the bottom plate is flat, the lower surface of the bottom plate will generate a large adsorption force with the flat inner bottom wall of the bending machine, thereby hindering the advancement. The strip groove 24 can reduce the adsorption force interference of the bending die during the pushing process.

[0047] In some embodiments, the upper surface of the groove 24 gradually tilts upward along the forward direction of the hot bending mold. The tilted groove 24 can further reduce the adsorption force generated during the forward movement. Preferably, the tilt angle of the groove 24 is 45 degrees.

[0048] In some embodiments, the grooves 24 include at least two grooves 24 in a direction perpendicular to the pushing direction of the hot bending mold, and the at least two grooves 24 are arranged in parallel. Preferably, the distance between the outer groove walls of two adjacent grooves 24 is 30 mm.

[0049] In summary, the present invention can achieve the following beneficial effects:

[0050] (1) The thickness of the positioning insert 3 is pre-set according to the different bending lengths of the glass blank 4 on both sides of the bending line 22, so that the glass blank 4 can be normally formed into the desired shape. It can ensure the 3D glass curved surface effect by hot bending, effectively optimize the glass forming deviation defects, and thus realize glass hot bending;

[0051] (2) A ventilation groove is provided on the upper surface of the lower mold 2, which connects the mold cavity 21 with the outside world. This can reduce the pressure difference between the mold cavity 21 and the outside world, thereby improving safety. In addition, the ventilation groove can also remove the air in the mold cavity 21 and the gas generated during the heating process, thereby eliminating various defects in the finished product and reducing mold contamination.

[0052] (3) The bottom surface of the lower die 2 is processed with a strip groove 24 along the pushing direction of the hot bending die. When the entire hot bending die is pushed into the hot bending machine, the strip groove 24 can reduce the adsorption force interference generated by the bottom surface of the lower die 2 during the pushing process.

[0053] The above is a detailed introduction to a 3D glass hot bending mold structure provided in an embodiment of the present application. Specific examples are used herein to illustrate the principles and embodiments of the present application. The description of the above embodiments is only used to help understand the method and core idea of ​​the present application. At the same time, for technical personnel in this field, based on the ideas of the present application, there will be changes in the specific embodiments and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

[0054] The above is merely one or more embodiments of this specification and is not intended to limit this specification. It will be apparent to those skilled in the art that various modifications and variations may be made to one or more embodiments of this specification. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of one or more embodiments of this specification shall be included within the scope of the claims of this specification.

Claims

1. A 3D glass hot bending mold structure, characterized in that: include: A lower mold (2), the lower mold (2) comprising a plurality of bending lines (22) arranged along the width direction, a concave mold cavity (21) formed on both sides from the bending lines (22), and an upper opening of the mold cavity (21) for placing a glass blank (4); An upper mold (1), the upper mold (1) being used to close the opening above the mold cavity (21), and a protruding module (11) is formed on the lower surface of the upper mold (1) and cooperates with the upper surface of the mold cavity (21); The lower mold (2) is further provided with a downwardly recessed groove (24) on the bending line (22) of the mold cavity (21) for placing the positioning inserts (3) of different thicknesses to adjust the height of the positioning insert (3) protruding from the groove (24).

2. A 3D glass bending mold structure according to claim 1, characterized in that: Along the length direction of the lower mold (2), the heights at which two adjacent positioning inserts (3) protrude from the groove (24) are different, so that the glass blank (4) is tilted between two adjacent bending lines (22).

3. A 3D glass bending mold structure according to claim 2, characterized in that: The lower mold (2) is formed with a bent long side (221) and a bent short side (222) between two adjacent bending lines (22), and the glass blank (4) is inclined downward from the bent short side (222) to the bent long side (221).

4. The 3D glass bending mold structure according to claim 1, characterized in that: The mold cavity (21) is provided with a plurality of positioning columns (23) in opposite directions along the length thereof, for limiting the two sides of the glass blank (4) in the width direction.

5. A 3D glass bending mold structure according to any one of claims 1 to 4, characterized in that: The upper die (1) and the lower die (2) are made of graphite or high-temperature alloy.

6. A 3D glass bending mold structure according to any one of claims 1 to 4, characterized in that: A ventilation groove is provided on the upper surface of the lower mold (2), and the ventilation groove is connected with the mold cavity (21) and the outside world.

7. The 3D glass bending mold structure according to claim 6, characterized in that: The bottom surface of the lower die (2) is processed with a strip-shaped groove (24) along the pushing direction of the hot bending die.

8. The 3D glass bending mold structure according to claim 7, characterized in that: The upper surface of the groove (24) gradually slopes upward along the advancing direction of the hot bending die.

9. The 3D glass bending mold structure according to claim 8, characterized in that: The grooves (24) include at least two grooves in a direction perpendicular to the pushing direction of the hot bending die, and at least two of the grooves (24) are arranged in parallel.

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