Glass forming composite mold

Abstract

The present application relates to the technical field of glass hot bending forming, and particularly discloses a glass forming composite mold for hot bending a planar glass plate into a glass product with a predetermined curved surface. The composite mold comprises a frame-shaped mold frame, an isolation layer and a plurality of support members. The mold frame has a hollow frame-shaped structure with a concave shape corresponding to the predetermined curved surface. The isolation layer is laid above the mold frame and is made of the same material as the glass product, and is used to isolate the glass product from direct contact with the mold frame. The outer contour size of the isolation layer is smaller than that of the glass product. The plurality of support members are fixedly arranged at the inner side edges of the mold frame, and the upper end faces of the support members jointly form a support curved surface that is adapted to the curved surface edge of the glass product after forming. During hot bending forming, the isolation layer sinks together with the softened glass product until it falls into the interior of the mold frame and is supported by the support members, and the edge of the glass product forms the required curvature at the edge of the mold frame. The present application effectively avoids burns and scratches caused by direct contact between the glass product and the metal mold frame by arranging the isolation layer made of the same material, and significantly improves the forming quality.

Description

Technical Field

[0001] This invention relates to the field of glass hot bending forming technology, specifically to a glass forming composite mold. Background Technology

[0002] In the hot bending process of large-area vehicle glass (such as windshields), a rigid die that matches the shape of the target glass surface is typically used. During the forming process, the heated and softened glass sheet sinks and adheres to the surface of the die under its own weight to obtain the desired curvature.

[0003] However, the aforementioned existing technologies have significant drawbacks. First, the high-temperature softened glass comes into direct contact with the metal mold. Due to the significant difference in their thermal conductivity and specific heat capacity, the glass surface is prone to thermal stress damage caused by excessive local temperature differences, manifesting as "scalding." Simultaneously, the combined effects of high temperature, friction, and lubrication can easily cause pitting (fine surface depressions) on the product surface, severely damaging the optical uniformity of the glass and resulting in substandard optical performance of the final product. Second, during the glass softening and sinking process, the central area sinks first, while the edges slide relative to each other above the mold support points. This sliding easily causes mechanical scratches on the glass surface, affecting the product's appearance quality and strength.

[0004] Furthermore, for large-sized or highly curved glass products, traditional integral molds struggle to adapt to the dynamic deformation requirements during the glass sinking process, easily leading to insufficient precision in the formed surface. For products with significant edge warping, relying solely on weight for forming also fails to guarantee the accuracy of the edge shape. Therefore, we propose a composite glass forming mold. Summary of the Invention

[0005] The purpose of this invention is to provide a glass molding composite mold to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a glass forming composite mold for hot bending a flat glass sheet into a glass product with a predetermined curved surface, comprising:

[0007] The mold frame has a hollow frame structure, and its overall shape has a concave shape corresponding to the predetermined curved surface;

[0008] An isolation layer is laid on top of the mold frame to isolate the glass product from direct contact with the mold frame. The isolation layer is made of the same material as the glass product, and its outer contour dimension is smaller than that of the glass product.

[0009] And multiple support members are fixedly installed on the inner edge of the mold frame, and the upper surfaces of the multiple support members together form a support surface that matches the curved edge of the glass product after molding.

[0010] During hot bending, the insulating layer sinks along with the softened glass product until it falls into the mold frame and is supported by the support member. The edge of the glass product continues to sink beyond the edge of the mold frame to form the required curvature at the edge of the mold frame.

[0011] Preferably, the inner side of the mold frame is further provided with a pre-forming layer, which is located above the support and below the isolation layer. The pre-forming layer is made of glass, and its softening point is higher than that of the glass product, so as to provide stable spherical guidance for the sinking of the glass product.

[0012] Preferably, the mold frame is a split structure, which is divided into two relatively independent half-frames along its length. The adjacent ends of the two half-frames are rotatably connected by a pivot. The distal ends of the two half-frames are slidably and rotatably mounted on a base. The base is also provided with a support for supporting the pivot. The support has a set support strength. Before the glass product softens sufficiently, the support maintains the pivot at a predetermined height, keeping the mold frame in its initial posture. As the glass product softens and sinks, the downward pressure exceeds the support strength of the support, the pivot moves downward, and the distal ends of the two half-frames slide relative to the base and tilt upward, so that the mold frame as a whole conforms to the sinking trend of the glass product and forms a continuous concave shape.

[0013] Preferably, a pre-forming layer is provided on the inner side of the mold frame. The overall size of the pre-forming layer is smaller than that of the mold frame, and the pre-forming layer is independently and fixedly supported on the base. The pre-forming layer is located inside the mold frame and does not deform with the mold frame. The upper surface of the pre-forming layer is adapted to the curved surface of the glass product after molding.

[0014] Preferably, edge forming mechanisms are respectively provided on the outer sides of both ends of the mold frame along its length. Each edge forming mechanism includes a lever frame, a curved template, and a counterweight. The lever frame is I-shaped, having a rotating shaft and two crossbeams extending along the length of the mold frame. The axis of the rotating shaft is arranged along the width of the mold frame, and the rotating shaft is rotatably connected to the end of the mold frame. The two crossbeams are located on both sides of the width of the mold frame and are rotatably connected via the rotating shaft. With the rotating shaft as the boundary, the two crossbeams are located along the length of the mold frame. The outer end of each beam is connected to the curved template, and the inner end of each beam along the length of the mold frame is equipped with a counterweight. Before the glass product is heated and softened, the end with the counterweight is raised, and the end with the curved template is lowered to support the edge of the glass product. During the heating process, as the glass product softens, the counterweight rotates downward under the action of gravity, causing the end with the curved template to rotate upward, pushing the edge of the glass product upward and fitting it to the surface of the curved template to form an edge warp.

[0015] Preferably, the mold frame is provided with positioning components that can move up and down at the four corners. The positioning components are used to position the glass product horizontally before heating. A transmission component is fixedly connected to the lever frame. The transmission component moves with the rotation of the lever frame and pushes the positioning component upward during the movement, so that the positioning component disengages from the glass product before the glass product sinks to the edge forming stage, so as to avoid interfering with the curved template.

[0016] Preferably, the transmission component has a recessed portion, and the positioning component has a sliding end that mates with the recessed portion; a pressure plate is connected between the two positioning components at the same end along the length direction of the mold frame, and the lower surface of the pressure plate is adapted to the shape of the upper surface of the formed glass product; when the lever frame rotates to its limit position, the sliding end slides into the recessed portion, causing the positioning component to drive the pressure plate to fall downwards, and the pressure plate applies a compaction effect to the edge of the formed glass product.

[0017] Preferably, the edge of the pressure plate is provided with a rounded corner transition structure; the centroid of the whole formed by the two positioning components and the pressure plate is projected in the vertical direction into the lower pressing surface area of ​​the pressure plate, and the positioning surface of the positioning component for contacting the glass product extends in the horizontal direction beyond the edge of the pressure plate near the mold frame.

[0018] Preferably, the center of mass of the whole formed by the two positioning components and the pressure plate is located directly above the point where the center of mass of the cross-section of the pressure plate is located.

[0019] Compared with the prior art, the beneficial effects of the present invention are:

[0020] By setting an isolation layer of the same material as the glass product, the glass product is completely isolated from the iron mold frame, effectively avoiding defects such as burns, pitting, and scratches on the product surface, and significantly improving the optical and appearance quality of the molded glass.

[0021] By setting a pre-forming layer with a softening point higher than that of the product glass, a stable spherical guide is provided for the sinking of the glass product at the forming temperature, ensuring the dimensional accuracy of the product surface and the stability of the spherical value.

[0022] The split-type adaptive mold frame structure utilizes the critical instability characteristics of the support section to allow the mold frame to automatically adapt to deformation during the softening and sinking of the glass. It is particularly suitable for molding large-size, high-curvature glass products, effectively improving the molding quality.

[0023] The lever-type edge forming mechanism utilizes the gravity of the counterweight to automatically apply an upward pushing force to the edge after the glass softens, so that the edge precisely fits the curved template, achieving precise forming of edges with large warping curvature.

[0024] The coordinated design of the pressure plate and positioning components automatically applies a compaction effect to the edge area after edge forming, ensuring that the edge fully fits the mold. At the same time, the center of gravity balance design and rounded corner transition structure prevent the formation of indentations. Attached Figure Description

[0025] Figure 1 This is a half-section diagram of the product glass on the mold frame before it is heated;

[0026] Figure 2 for Figure 1 Enlarged schematic diagram of area A structure in the image;

[0027] Figure 3 This is a schematic diagram of the four-section module state structure of the present invention;

[0028] Figure 4 for Figure 3 The front view;

[0029] Figure 5 This is a schematic diagram showing the state of a four-section molded glass product after it has been fully molded.

[0030] Figure 6 for Figure 4 Enlarged schematic diagram of the structure of region B in the image;

[0031] Figure 7 This is a schematic diagram showing the process of flipping up the curved template and the partial non-adhesion of the product glass.

[0032] Figure 8 A schematic diagram of the recessed part on the transmission component;

[0033] Figure 9This is a schematic diagram of the positioning component in Embodiment 9;

[0034] Figure 10 Schematic diagram of wedge and threaded rod.

[0035] In the diagram: 1-Mold frame; 11-Support component; 12a, 12b-Half frame; 13-Rotating shaft; 2-Isolation layer; 3-Pre-forming layer; 3'-Independent pre-forming layer; 32-Support column; 4-Base; 41-Fixing rod; 42-Strut; 43-Annular groove; 44-Fixing rod; 45-Stop bar; 5-Support part; 6-Edge forming mechanism; 61-Lever frame; 611-Rotating shaft; 612a, 612b-Crossbeam; 62-Curved template; 63-Counterweight block; 631-Support foot; 64-Transmission component; 641-Recess; 7-Positioning assembly; 71-Positioning surface;

[0036] 8-Pressure plate; 81-Rounded corner transition structure; 9-Guide groove; 10-Wedge block; 101-C-shaped structure; 12-Threaded rod; 13-Adjusting disc; 100-Glass product. Detailed Implementation

[0037] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] Please see Figure 1-10 The present invention provides a technical solution: a glass forming composite mold.

[0039] Before describing each embodiment in detail, the functional principles and material selection of each core component in the composite mold of the present invention will be explained first.

[0040] In this invention, the composite mold is composed of multiple layers. The mold frame 1 is the first layer, made of flat iron. The flat iron ensures sufficient structural strength to support the glass product while also enabling a lightweight design, facilitating equipment installation and debugging. The isolation layer 2 (the third layer) serves as an intermediate spacer laid above the pre-forming layer 3 (i.e., between the pre-forming layer 3 and the glass product 100 to be formed). Its material is the same as the glass product 100, made of dark-colored glass. During the thermoforming process, if the glass product comes into direct contact with the iron mold frame, the combined effects of high temperature, friction, and lubrication can easily cause defects such as pitting (small surface dents), burns, and scratches on the product surface. The function of the isolation layer 2 is to separate the glass product 100 from the mold frame 1, so as to prevent the product from directly contacting the iron mold and causing pitting and scratches; at the same time, the dark glass can effectively block the heat absorbed by the iron mold frame from being directly conducted to the glass surface of the product, so as to avoid burn defects caused by excessive local temperature difference. The isolation layer 2 is a disposable pad.

[0041] The glass product 100 to be formed is shown as double-layered laminated glass in this invention, but it can also be single-layered glass in practical applications.

[0042] Preformed layer 3, serving as the second mold layer, is made of a special high-temperature resistant glass material with a softening point more than 100°C higher than that of ordinary glass. When the product glass reaches its softening point, preformed layer 3 maintains its solid state without softening or deformation, thus stably supporting the product and ensuring dimensional accuracy. The thermal conductivity of preformed layer 3 is lower than that of iron, preventing the transfer of excessive heat to the central spherical surface of the product glass, which could cause burns or other defects. Regarding the manufacturing process of preformed layer 3, taking a small-sized specification as an example, it is first initially formed by heating on a smaller hollow mold, then a second forming is performed on a solid cast iron mold to ensure the stability of the spherical depression value. Finally, it is placed under a larger, normal hollow mold to form a composite mold.

[0043] Based on the above principles, the specific embodiments will be described in detail below.

[0044] Example 1

[0045] like Figure 1 and Figure 2 As shown, the present invention provides a glass forming composite mold, including a frame mold base 1. The mold base 1 is a hollow quadrilateral frame structure, and its entire structure has a concave arc in both the length and width directions. The size of the arc in both directions is set according to the corresponding glass product 100 to adapt to the spherical shape requirements of large-area vehicle glass (such as windshields). The mold base 1 is made of flat iron, which can ensure that the mold base has sufficient structural strength while also achieving a lightweight design.

[0046] Isolation layers 2 are installed at the four corners of the mold frame 1. Isolation layers 2 are made of the same material as the glass product 100 to be formed, but are made of dark-colored glass to prevent heat from the iron mold frame from being directly conducted to the glass surface of the product. The circumferential dimensions of both the mold frame 1 and the isolation layers 2 are smaller than the outline dimensions of the glass product 100 to be formed, with the isolation layers 2 being larger than the mold frame 1 but slightly smaller than the product 100. Before forming, both the isolation layers 2 and the product 100 are flat plates.

[0047] The inner edge of the mold frame 1 is provided with multiple inwardly protruding support members 11. The overall distribution of each support member 11 is adapted to the curved edge shape of the formed glass product 100. The upper end face of each support member 11 together forms a support curved surface adapted to the curved edge of the formed glass product.

[0048] During the heating and forming process, the softened glass product 100 and the insulating layer 2, being made of identical materials and having the same softening point, sink synchronously. As the glass product softens and sinks, its planar dimensions decrease accordingly. The insulating layer 2 gradually falls into the mold frame 1 and is supported by the support member 11 to form the required curved surface of the product. Simultaneously, the edge of the glass product 100 contacts the edge of the mold frame 1 during the synchronous sinking process, forming the required edge curvature at the edge of the mold frame 1. Due to the intervention of the insulating layer 2, the glass product 100 does not directly contact the metal mold frame 1 throughout the forming process, effectively avoiding burn defects caused by differences in the thermal properties of the materials; at the same time, the product edge is naturally curved at the edge of the mold frame, eliminating the risk of scratches without sliding.

[0049] Example 2

[0050] like Figure 1 and Figure 2 As shown, based on Embodiment 1, a pre-forming layer 3 is further provided on the support member 11 inside the mold frame 1. The pre-forming layer 3 is located above the support member 11 and below the isolation layer 2. Its lower surface is in contact with the upper end face of the support member 11, and its upper surface forms a concave contour similar to the spherical surface of the target product, which is used to guide the spherical stability of the product when it sinks. The pre-forming layer 3 is also made of a special high-temperature resistant glass material, whose softening point is more than 100°C higher than the softening point of the glass product 100 to be formed, so as to maintain its shape stability at the forming temperature and not undergo significant deformation, so as to stably support the product and ensure that the product size is qualified. The pre-forming layer 3 is completely located inside the mold frame 1, and together with the mold frame 1 and the isolation layer 2, it forms a complete composite mold structure. The mold frame 1 in this embodiment is an integral structure (i.e., a three-section mold structure), which is suitable for forming small-sized glass products with small curvature. It should be noted that Figure 1 The gap between the support member 11 and the preformed layer 3 is for ease of illustration.

[0051] Example 3

[0052] like Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, for glass products with larger dimensions or longer lengths, this embodiment improves the mold design based on Embodiment 1, adopting a split mold structure (i.e., a four-section mold structure), which is suitable for forming glass products with larger dimensions and larger curvature.

[0053] The mold frame 1 is divided into two independent half-frames 12a and 12b along its length. The adjacent ends of the two half-frames 12a and 12b are rotatably connected by a pivot 13, which extends outward (i.e., to both ends in the width direction). The other ends (farthest ends) of the two half-frames 12a and 12b are slidably and rotatably mounted on the base 4.

[0054] A vertically mounted fixing rod 41 is fixed on the base 4. A horizontal support rod 42 is mounted on the fixing rod 41. The support rod 42 is preferably cylindrical and has an annular groove machined on it corresponding to the thickness of one side of the half-frame. The half-frames 12a and 12b have waist-shaped grooves extending along their length. The support rod 42 passes into the waist-shaped grooves, and the edge of the waist-shaped groove of the half-frame is recessed into the annular groove for limitation. The half-frames 12a and 12b can slide relative to the support rod 42 within the length of the waist-shaped groove and can also rotate relative to the support rod 42.

[0055] The base 4 is also provided with a support part 5 for supporting the rotating shaft 13. The support part 5 has a set support strength, which has an initial support force but no self-resetting ability. In this embodiment, the support part 5 is made of welding rod, and its two ends are mounted between two vertically fixed rods 44 on the base 4. Multiple sets of stop rods 45 are arranged at intervals along the vertical direction on the fixed rods 44, and the welding rod 5 is placed on the stop rods 45 to form support. Before heating, the welding rod 5 supports the rotating shaft 13, so that the two ends of the two half-frames 12a and 12b are at the same height. After heating, as the glass product 100 softens and sinks, the downward pressure on the rotating shaft 13 gradually increases. When the pressure exceeds the initial support strength of the welding rod 5, the welding rod 5 bends and does not rebound. The rotating shaft 13 moves downward, and the distal ends of the two half-frames 12a and 12b slide relative to the support rod 42 and tilt upward, so that the mold frame 1 as a whole forms a continuous concave shape, in line with the sinking trend of the glass product 100.

[0056] In other embodiments, the support portion 5 can also be made of shape memory metal with heat-insulating material on its surface. This allows the change in its support strength to be related not only to the downward pressure but also to the temperature. When the temperature reaches a set value, the shape memory metal undergoes a phase change and actively loses its supporting function without self-resetting. Any support component that functions equivalently to the welding rod in this embodiment—that is, that has initial supporting force, gradually loses its supporting function after exceeding a critical value, and does not have the ability to self-reset—should be considered an equivalent alternative to the present invention.

[0057] Example 4

[0058] like Figure 4 As shown in Embodiment 3, when a split adaptive mold frame is used, the preformed layer cannot be fixed to the mold frame because the mold frame 1 will deform during the molding process. Therefore, in this embodiment, an independently fixed preformed layer 3' is provided on the inner side of the mold frame 1 and supported on the base 4.

[0059] The overall size of the preformed layer 3' is smaller than the internal contour of the mold frame 1. It is fixed to the base 4 by independent support columns 32, located inside the mold frame 1, and does not shift with the deformation of the mold frame 1. The upper surface of the preformed layer 3' is adapted to the target curved surface of the glass product 100 after molding. During the softening and sinking process of the glass product 100, the preformed layer 3' provides stable spherical guidance for the isolation layer 2 and the glass product 100, ensuring the accuracy of the molded curved surface. The isolation layer 2 completely covers the top of the preformed layer 3', and after molding, the isolation layer 2 adheres to the surface of the preformed layer 3'.

[0060] Example 5

[0061] like Figure 3 , Figure 4 and Figure 6 As shown, based on Embodiment 2 or Embodiment 3, for glass products with large edge curvature or large size, this embodiment provides edge forming mechanisms 6 on the outer sides of both ends of the mold frame 1 in the length direction.

[0062] The edge forming mechanism 6 includes a lever frame 61, a curved template 62, and a counterweight 63. The lever frame 61 is generally I-shaped, with a rotating shaft 611 and two crossbeams 612a and 612b extending along the length of the mold frame 1. The axis of the rotating shaft 611 is arranged along the width of the mold frame 1 and is rotatably connected to the end of the mold frame 1. The two crossbeams 612a and 612b are located on both sides of the width of the mold frame 1 and are rotatably connected to the mold frame 1 via the rotating shaft 611. The lever frame 61 is directly mounted on the mold frame 1. Specifically, a semi-circular groove is provided at the end of the mold frame 1 along its length, and the rotating shaft 611 is directly mounted in the semi-circular groove, making the lever frame 61 detachable from the mold frame 1. Since there may be minor adjustments between different generations of the same series of glass products, the detachable design of the lever frame 61 facilitates local replacement and adjustment without replacing the entire mold, and the detachable design also facilitates the transfer and storage of the mold.

[0063] With the rotation axis 611 as the boundary, each crossbeam is divided into two parts: the shorter part located on the outer side of the mold frame 1 along its length is the short lever arm end, and the longer part located on the inner side of the mold frame 1 along its length is the long lever arm end. The short lever arm ends of the two crossbeams 612a and 612b are connected to a curved template 62, which extends along the width direction of the mold frame 1, and its surface shape is adapted to the target warping shape of the edge of the glass product 100. Each of the long lever arm ends of the two crossbeams 612a and 612b is provided with a counterweight 63, that is, one counterweight 63 is independently installed on each crossbeam. The lower end of the counterweight 63 is also provided with a support foot 631, which smoothly contacts the surface of the base 4 when the counterweight 63 is pressed down to its final position.

[0064] Before the product 100 sinks (i.e., at room temperature), the end containing the counterweight 63 (long lever arm end) is in a raised position, while the end containing the curved template 62 (short lever arm end) sinks and supports the edge of the glass product 100. At this time, since the flat glass product 100 has not yet softened, its own rigidity is sufficient to press the curved template 62 end down. Although the counterweight 63 is installed, it is insufficient to overcome the rigidity of the glass and cause the curved template 62 to tilt upwards. As heating proceeds, the glass product 100 gradually softens, and the counterweight 63 rotates downwards under the action of gravity. Through leverage, it drives the end containing the curved template 62 to rotate upwards, pushing the edge of the glass product 100 upwards and making it adhere to the surface of the curved template 62, thereby forming the required edge warping curvature.

[0065] It should be noted that, for ease of understanding and demonstration of the installation and operation of positioning component 7, Figure 6 The long lever arm end and short lever arm end of the crossbeams 612a and 612b shown are shown in a decomposed state; in actual implementation, the two can be an integral structure or a separate combination structure.

[0066] Example 6

[0067] like Figure 6 and Figure 10 As shown, based on Embodiment 5, positioning components 7 that can move up and down are provided at the four corners of the mold frame 1. The positioning components 7 are used to position the glass product 100 in the horizontal direction before heating.

[0068] Specifically, the positioning component 7 is a rod-shaped part with two bent portions for positioning two adjacent edges of the flat glass product 100. One bent portion is arranged along the length direction of the mold frame, and the other bent portion is arranged along the width direction of the mold frame, thereby jointly limiting the glass product in the horizontal direction. The positioning component 7 is sleeved at the four corners of the mold frame 1 and can slide up and down in the vertical direction.

[0069] To accommodate dimensional adjustments between different generations of glass products, the positioning component 7 can be adjusted along the length of the mold frame 1. Specifically, guide grooves 9 extending along the length direction are provided at the four corners of the mold frame 1. Wedges 10 are slidably fitted within the guide grooves 9. A C-shaped structure 101 is provided on the outer wall of the wedge 10. The lower end of the positioning component 7 is directly fitted onto the C-shaped structure 101 and fixed with a positioning pin to prevent rotation, ensuring that the positioning component 7 remains fixed in the circumferential direction relative to the wedge and does not rotate, but only moves synchronously with the wedge along the guide grooves 9. A threaded rod 12 is threadedly connected to the end of the mold frame 1. One end of the threaded rod 12 is rotatably connected to the wedge 10, and the other end of the threaded rod 12 is fixedly connected to an adjusting disc 13. By rotating the adjusting disc 13, the threaded rod 12 can be driven to slide the wedge 10 along the guide grooves 9, thereby causing the positioning component 7 to move as a whole along the length of the mold frame 1, achieving precise dimensional adjustments to meet the dimensional differences between different generations of products.

[0070] A transmission component 64 (a push rod in this embodiment) is fixed on the lever frame 61. The transmission component 64 has a mating surface that abuts against the positioning component 7.

[0071] During the heating and sinking process of the glass product 100, the lever frame 61 rotates as the counterweight 63 moves downward, and the transmission component 64 rotates upward in sync, pushing the positioning component 7 upward so that the positioning component 7 disengages from the edge of the glass product 100 and moves away from the curved template 62. In this way, during the edge forming stage, the positioning component 7 will not interfere with the upward forming action of the curved template 62 on the edge of the glass.

[0072] It should be noted that on one side of the glass product 100 in the width direction, since there is no need for edge-flipping molding to avoid the obstruction, the positioning on this side can be achieved using an independently set positioning rod, which can be fixed to the base 4 without the need for a lifting structure. This embodiment and the accompanying drawings focus on describing the structure of the positioning components 7 that need to avoid obstruction on both sides in the length direction (i.e., the bending of the positioning in the width direction is not shown).

[0073] Example 7

[0074] like Figure 8 and Figure 9 As shown, based on Embodiment Six, a recessed portion 641 is provided on the transmission component 64, and the positioning component 7 has a sliding end that cooperates with the recessed portion 641. During the rotation of the transmission component 64 with the lever frame 61, the sliding end of the positioning component 7 slides on the upper surface of the transmission component 64. When the lever frame 61 rotates to the limit position (i.e., the counterweight 63 reaches the lowest point and the glass product 100 completes the formed curved surface state), the sliding end slides into the recessed portion 641, and the positioning component 7 then falls back.

[0075] A pressure plate 8 is connected between two positioning components 7 at the same end along the length of the mold frame 1. Specifically, at each end along the length of the mold frame 1, a pressure plate 8 is connected between two positioning components 7 located on either side of the width direction. The pressure plate 8 extends along the width direction of the mold frame 1, and its lower surface conforms to the shape of the upper surface of the formed glass product 100. When the positioning components 7 fall back, they move the pressure plate 8 downwards, pressing down on the edge area of ​​the glass product 100. The pressure plate 8 is made of a high-temperature resistant material with low thermal conductivity to prevent burns to the glass product due to excessive temperature during direct contact.

[0076] Since the contact area of ​​the edge of the glass product 100 on the curved template 62 is small, it may not be able to completely fit the surface of the curved template 62 under its own weight. The pressing action of the pressure plate 8 can effectively eliminate this defect and ensure the precise forming of the edge curved surface.

[0077] Regarding the fallback method of positioning component 7, this embodiment provides two optional solutions:

[0078] One method is a cliff-like freefall, where the recessed portion 641 has steep sidewalls. When the positioning component 7 reaches the position of the recessed portion 641, it suddenly falls, using the combined gravitational potential energy of the positioning component 7 and the pressure plate 8 to impact and compact the glass. This solution has a lighter overall structure, but the impact force may cause indentation risks.

[0079] The second method is a slow-pressing type, where the recessed part 641 has a gently sloping sidewall, and the positioning component 7 gradually slides down along the slope, causing the pressure plate 8 to slowly press down. This method will not produce impact indentations, but the positioning component 7 and the pressure plate 8 need to have sufficient self-weight to ensure the downward pressure.

[0080] Example 8

[0081] like Figure 9 As shown, based on Embodiment 7, the edge of the pressure plate 8 is rolled upward to form a rounded transition structure 81 to avoid damage to the glass surface during the compaction process.

[0082] The overall structure formed by the two positioning components 7 and the pressure plate 8 has its center of mass projected vertically into the area of ​​the pressure plate 8's lower pressing surface. Thus, when the positioning components 7 fall back and cause the pressure plate 8 to press down, the downward pressure is applied relatively evenly within the pressure plate 8's lower pressing surface area, without causing uneven pressure distribution due to severe off-center loading, which would result in indentations.

[0083] Meanwhile, the positioning surface 71 of the positioning component 7, which contacts the glass product, extends horizontally beyond the edge line of the pressure plate 8 near the mold frame 1. This design ensures that when the positioning component 7 moves upward to avoid interference, the pressure plate 8 will not interfere with or collide with the edge of the glass product 100, thus guaranteeing the reliability of the operation and the safety of the product.

[0084] Example 9

[0085] like Figure 9 As shown, in the preferred embodiment of Example 8, the center of mass of the whole formed by the two positioning components 7 and the pressure plate 8 is located directly above the point where the center of mass of the cross section of the pressure plate 8 is located. This design ensures that the downward pressure passes vertically through the centroid of the cross section of the pressure plate 8 without generating any additional torque. When pressing down, the pressure plate 8 is subjected to the most uniform force, resulting in the best compaction effect, and there is absolutely no risk of off-center indentation.

[0086] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0087] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A glass forming composite mold for hot bending a flat glass sheet into a glass product with a predetermined curved surface, characterized in that, include: The mold frame has a hollow frame structure, and its overall shape has a concave shape corresponding to the predetermined curved surface; An isolation layer is laid on top of the mold frame to isolate the glass product from direct contact with the mold frame. The isolation layer is made of the same material as the glass product, and its outer contour dimension is smaller than that of the glass product. And multiple support members are fixedly installed on the inner edge of the mold frame, and the upper surfaces of the multiple support members together form a support surface that matches the curved edge of the glass product after molding. During hot bending, the insulating layer sinks along with the softened glass product until it falls into the mold frame and is supported by the support member. The edge of the glass product continues to sink beyond the edge of the mold frame to form the required curvature at the edge of the mold frame.

2. The glass forming composite mold according to claim 1, characterized in that, The inner side of the mold frame is also provided with a pre-forming layer, which is located above the support and below the isolation layer. The pre-forming layer is made of glass, and its softening point is higher than that of the glass product. It is used to provide stable spherical guidance for the sinking of the glass product.

3. The glass forming composite mold according to claim 1, characterized in that, The mold frame is a split structure, which is divided into two relatively independent half-frames along the length direction. The adjacent ends of the two half-frames are rotatably connected by a pivot. The far ends of the two half-frames are slidably and rotatably mounted on the base. The base is also provided with a support for supporting the pivot. The support part has a set support strength. Before the glass product softens sufficiently, the support part maintains the pivot at a predetermined height, so that the mold frame maintains its initial posture. As the glass product softens and sinks, the downward pressure exceeds the support strength of the support part, the pivot moves down, and the distal ends of the two half-frames slide relative to the base and tilt upward, so that the mold frame as a whole conforms to the sinking trend of the glass product and forms a continuous concave shape.

4. The glass forming composite mold according to claim 3, characterized in that, The mold frame has a pre-forming layer on its inner side. The overall size of the pre-forming layer is smaller than that of the mold frame, and the pre-forming layer is independently and fixedly supported on the base. The pre-forming layer is located inside the mold frame and does not deform with the mold frame. The upper surface of the pre-forming layer is adapted to the curved surface of the glass product after it is formed.

5. A glass forming composite mold according to claim 2 or 3, characterized in that, The outer sides of both ends of the mold frame along its length are respectively provided with edge forming mechanisms, and the edge forming mechanism includes a lever frame, a curved template and a counterweight; The lever frame is I-shaped and has a rotating shaft and two crossbeams extending along the length of the mold frame. The axis of the rotating shaft is set along the width of the mold frame. The rotating shaft is rotatably connected to the end of the mold frame. The two crossbeams are located on both sides of the width of the mold frame and are rotatably connected through the rotating shaft. With the rotation axis as the boundary, the ends of the two crossbeams located on the outer side of the mold frame in the length direction are connected to the curved template, and the ends of the two crossbeams located on the inner side of the mold frame in the length direction are each provided with the counterweight block; Before the glass product is heated and softened, the end where the counterweight is located is raised, and the end where the curved template is located is lowered and supports the edge of the glass product. During the heating process, as the glass product softens, the counterweight rotates downward under the action of gravity, which drives the end where the curved template is located to rotate upward, pushing the edge of the glass product upward and fitting it to the surface of the curved template to form an edge warping.

6. A glass forming composite mold according to claim 5, characterized in that, The mold frame is provided with positioning components that can move up and down at its four corners. The positioning components are used to position the glass product horizontally before heating. A transmission component is fixedly connected to the lever frame. The transmission component moves with the rotation of the lever frame and pushes the positioning component upward during the movement, so that the positioning component disengages from the glass product before the glass product sinks to the edge forming stage, so as to avoid interfering with the curved template.

7. A glass forming composite mold according to claim 6, characterized in that, The transmission component has a recessed portion, and the positioning component has a sliding end that cooperates with the recessed portion; A pressure plate is connected between the two positioning components at the same end of the mold frame along the length direction. The lower surface of the pressure plate is adapted to the shape of the upper surface of the glass product after it is formed. When the lever frame rotates to its limit position, the sliding end slides into the recess, causing the positioning component to drive the pressure plate to fall downwards, and the pressure plate applies a compacting effect to the edge of the formed glass product.

8. A glass forming composite mold according to claim 7, characterized in that, The edge of the pressure plate is provided with a rounded corner transition structure; the centroid of the whole formed by the two positioning components and the pressure plate is projected in the vertical direction into the lower pressing surface area of ​​the pressure plate, and the positioning surface of the positioning component for contacting the glass product extends in the horizontal direction beyond the edge of the pressure plate near the mold frame.

9. A glass forming composite mold according to claim 8, characterized in that, The center of mass of the two positioning components and the pressure plate is located directly above the center of mass of the pressure plate's cross-section.

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