Constant temperature and pressure device for curing honeycomb board

Abstract

The utility model provides a kind of constant temperature pressurizing device of honeycomb board solidification forming belongs to honeycomb board solidification forming technical field, this constant temperature pressurizing device of honeycomb board solidification forming includes pressurizing cavity, heating assembly and platen assembly, the pressurizing cavity is cuboid box type structure, the inner wall surface of pressurizing cavity is equipped with heat preservation layer, the heating assembly is fixedly installed in the bottom inner wall of pressurizing cavity, the platen assembly is located in the pressurizing cavity inside and is located above the heating assembly, the platen assembly includes upper platen and lower platen;It can solve the technical problems that the uneven stress of honeycomb plate in the pressurizing process caused by adopting plane type platen structure when the existing constant temperature pressurizing solidification of honeycomb plate solidification forming, there is significant difference in pressure between the center part and the edge part of honeycomb plate, so that the honeycomb plate appears local density inconsistency, surface flatness is poor and internal structure strength distribution is uneven after solidification.

Description

Technical Field

[0001] This utility model belongs to the field of honeycomb panel curing and molding technology, specifically, it relates to a constant temperature and pressure device for honeycomb panel curing and molding. Background Technology

[0002] Honeycomb panels, as a lightweight and high-strength composite material, are widely used in aerospace, architectural decoration, transportation, and other fields. The curing and molding process is a key step in the manufacturing of honeycomb panels, directly affecting their final quality and performance. Existing honeycomb panel curing processes typically employ a constant temperature and pressure method. The honeycomb core material coated with adhesive and the panel are placed in a pressure device, and a certain temperature and pressure are applied to cure the adhesive, thus firmly bonding the honeycomb core material and the panel into a whole. Current pressure devices often use a planar upper and lower pressure plate structure, with both the upper and lower pressure plates being flat surfaces. Hydraulic or pneumatic pressure drives the upper pressure plate downwards to apply pressure to the honeycomb panel, while heating elements heat the pressure area to reach the required curing temperature. However, this planar pressure... The honeycomb panel structure has obvious defects. Due to the thickness of the honeycomb panel itself and the large number of voids inside the honeycomb core material, when pressure is applied by the flat platen, the center of the honeycomb panel bears greater pressure because it is closer to the center of the platen, while the pressure transmission is significantly attenuated due to the greater distance at the edges. This uneven stress results in the honeycomb panel having excessively high density in the center and insufficient density in the edges after curing, poor surface flatness, and uneven distribution of internal structural strength, affecting the overall performance and service life of the honeycomb panel. To solve this problem, existing technologies have attempted to increase the number of platens or adopt segmented pressing methods, but these methods not only increase the complexity of the equipment and manufacturing costs, but also make it difficult to achieve precise pressure control in actual operation, and the results are not ideal. Utility Model Content

[0003] In view of this, the present invention provides a constant temperature and pressure device for curing honeycomb panels, which can solve the technical problems of uneven force on honeycomb panels during the constant temperature and pressure curing process caused by the use of a planar pressure plate structure in existing honeycomb panel curing devices. This results in significant differences in pressure between the center and edge of the honeycomb panel, leading to inconsistent local density, poor surface flatness, and uneven distribution of internal structural strength after curing.

[0004] This utility model is implemented as follows:

[0005] This utility model provides a constant temperature and pressure device for curing honeycomb panels, including a pressure chamber, a heating component, and a pressure plate assembly. The pressure chamber is a cuboid box structure with an insulation layer on its inner wall. The heating component is fixedly installed on the bottom inner wall of the pressure chamber. The pressure plate assembly is located inside the pressure chamber and above the heating component. The pressure plate assembly includes an upper pressure plate and a lower pressure plate, which are arranged opposite to each other. The lower pressure plate is in close contact with the top surface of the heating component. The upper pressure plate is connected to the top inner wall of the pressure chamber via a connecting rod that extends vertically. The upper pressure plate can move up and down relative to the lower pressure plate along the axial direction of the connecting rod. The bottom surface of the upper pressure plate has multiple evenly distributed arc-shaped protrusions with circular arc cross-sections. The distance between the lowest point of each arc-shaped protrusion and the bottom surface of the upper pressure plate gradually increases from the center to the edge of the upper pressure plate.

[0006] The technical effects of the constant temperature and pressure device for curing honeycomb panels provided by this utility model are as follows: By setting multiple evenly distributed arc-shaped protrusions on the bottom surface of the upper pressure plate, and the distance between the lowest point of the arc-shaped protrusion and the bottom surface of the upper pressure plate gradually increases from the center to the edge of the upper pressure plate, a gradient pressure distribution from the center to the edge can be achieved when the honeycomb panel is pressurized and cured. This avoids the problems of insufficient edge pressure or excessive center pressure caused by traditional flat pressure plates. At the same time, the arc-shaped cross-section of the arc-shaped protrusions can form flexible contact with the surface of the honeycomb panel during the pressurization process, reducing stress concentration and ensuring that the honeycomb panel is subjected to uniform force in all parts during the curing process, thereby improving the overall quality and flatness of the honeycomb panel after curing.

[0007] Based on the above technical solution, the constant temperature and pressure device for curing and molding honeycomb panels of this utility model can be further improved as follows:

[0008] The lower pressure plate has an arc-shaped groove on its top surface that corresponds to the arc-shaped protrusion on the bottom surface of the upper pressure plate, and the cross-sectional shape of the arc-shaped groove matches the cross-sectional shape of the arc-shaped protrusion.

[0009] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: By setting an arc-shaped groove on the top surface of the lower pressure plate that corresponds to the arc-shaped protrusion on the bottom surface of the upper pressure plate, and the cross-sectional shape of the arc-shaped groove matching the cross-sectional shape of the arc-shaped protrusion, the honeycomb panel can be stably positioned between the upper and lower pressure plates during the pressurization process. The cooperation between the arc-shaped protrusion and the arc-shaped groove forms a two-way covering constraint on the honeycomb panel, effectively preventing the honeycomb panel from lateral slippage or positional displacement during the pressurization process. At the same time, this upper and lower corresponding arc-shaped structure allows the pressure to be transmitted more evenly to all parts of the honeycomb panel, further improving the accuracy and stability of the honeycomb panel curing and molding.

[0010] Furthermore, the heating assembly includes multiple heating units, which are arranged in an array along the length and width of the inner wall at the bottom of the pressurized cavity, with equal spacing between adjacent heating units.

[0011] The beneficial effects of adopting the above-mentioned improved scheme are as follows: by designing the heating component as a structure comprising multiple heating units arranged in an array along the length and width of the inner wall at the bottom of the pressurized cavity with equal spacing between adjacent heating units, uniform heating coverage of the internal space of the pressurized cavity is achieved, avoiding the problem of local excessively high or low temperatures caused by a single heating source. The array-distributed heating units enable heat to diffuse evenly throughout the entire heating area, ensuring that the temperature of each part of the honeycomb panel is consistent during the curing process, thus improving the uniformity and consistency of the honeycomb panel curing. At the same time, the equal spacing design simplifies the installation and maintenance process of the heating component.

[0012] Furthermore, the connecting rod is a cylindrical rod, and a circular through hole is provided at the center of the top surface of the upper pressure plate. The connecting rod passes through the circular through hole and is fixedly connected to the upper pressure plate by a threaded connection.

[0013] The beneficial effects of adopting the above-mentioned improved scheme are as follows: By designing the connecting rod as a cylindrical rod body and opening a circular through hole at the center of the top surface of the upper pressure plate, and fixing the connecting rod to the upper pressure plate through the circular through hole via a threaded connection, the upper pressure plate can stably move up and down along the axial direction of the connecting rod. The cooperation between the cylindrical rod body and the circular through hole ensures the coaxiality of the upper pressure plate during movement, preventing the upper pressure plate from tilting or swaying. The threaded connection provides a reliable fixing effect, and at the same time, it is convenient to adjust the initial distance between the upper and lower pressure plates according to the honeycomb panels of different thicknesses, thereby improving the applicability and ease of operation of the device.

[0014] Furthermore, the edge of the upper pressure plate is provided with a downwardly extending limiting flange, the limiting flange having a continuous annular structure, and a fitting gap is formed between the inner wall surface of the limiting flange and the outer wall surface of the edge of the lower pressure plate.

[0015] The beneficial effects of adopting the above-mentioned improved scheme are as follows: By setting a structure with a continuous annular limiting flange extending downward at the edge of the upper pressure plate and forming a fitting gap between the inner wall of the limiting flange and the outer wall of the lower pressure plate, effective lateral limiting protection is provided for the honeycomb panel during the pressurization process. The limiting flange can prevent the honeycomb panel from excessively expanding or deforming outward when under pressure. The continuous annular structure ensures the integrity of the limiting effect. The setting of the fitting gap not only ensures the limiting effect but also avoids direct friction between the limiting flange and the lower pressure plate, reducing mechanical wear, extending the service life of the device, and also facilitating the loading and unloading of the honeycomb panel.

[0016] Furthermore, the side wall of the pressurized cavity is provided with an observation window, which is a rectangular opening, and the area of ​​the observation window accounts for 1 / 10 to 1 / 5 of the total area of ​​the side wall of the pressurized cavity.

[0017] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: By setting a rectangular observation window with an area of ​​1 / 10 to 1 / 5 of the total area of ​​the sidewall of the pressurizing chamber, the operator can observe the working status inside the pressurizing chamber in real time during the curing process of the honeycomb panel, and promptly detect whether the honeycomb panel has deformed, displaced or other abnormalities. The rectangular opening design provides a good field of view, and the reasonable area ratio not only meets the observation needs, but also does not have an excessive impact on the overall sealing and heat preservation performance of the pressurizing chamber, thereby improving the monitorability and safety of the device operation and facilitating timely adjustment of process parameters or handling of emergencies.

[0018] Furthermore, the insulation layer is made of aluminum silicate fiber felt material, and the thickness of the insulation layer gradually decreases from the bottom to the top of the inner wall of the pressurized cavity.

[0019] The beneficial effects of adopting the above-mentioned improved scheme are as follows: By using aluminum silicate fiber felt material to make the insulation layer and the insulation layer thickness gradually decreasing from the bottom to the top of the inner wall of the pressurization chamber, the natural law of hot air rising is fully utilized. The thicker insulation layer at the bottom of the pressurization chamber can effectively reduce the loss of heat from the bottom to the outside, ensuring that the heat generated by the heating components is fully utilized. The thinner insulation layer design at the top avoids heat accumulation caused by excessive insulation at the top. Aluminum silicate fiber felt material has good thermal insulation performance and high temperature resistance. This gradient insulation layer thickness distribution optimizes the internal temperature field of the pressurization chamber, improves energy utilization efficiency, and reduces operating costs.

[0020] Furthermore, the lower pressure plate has a rectangular plate structure, with its long side parallel to the long side of the bottom inner wall of the pressurizing cavity, and its short side parallel to the short side of the bottom inner wall of the pressurizing cavity.

[0021] The beneficial effects of adopting the above-mentioned improved scheme are as follows: By designing the lower pressure plate as a rectangular plate structure with its long side parallel to the long side of the inner wall of the bottom of the pressurizing cavity and its short side parallel to the short side of the inner wall of the bottom of the pressurizing cavity, the lower pressure plate can make full use of the effective space at the bottom of the pressurizing cavity. The consistency between the rectangular plate structure and the shape of the bottom of the rectangular cavity ensures a good match between the lower pressure plate and the pressurizing cavity. This parallel arrangement allows the lower pressure plate to be stably placed above the heating component, avoiding uneven heating or pressurization offset caused by positional deviation. At the same time, the rectangular structure facilitates the regular placement and positioning of the honeycomb panels, improving processing efficiency and product quality consistency.

[0022] Furthermore, the number of the arc-shaped protrusions is 8 to 12, and the arc-shaped protrusions are symmetrically distributed along the diagonal direction of the bottom surface of the upper pressure plate. The radius of the arc of each arc-shaped protrusion is 1 / 8 to 1 / 6 of the length of the diagonal of the upper pressure plate.

[0023] The beneficial effects of adopting the above-mentioned improved scheme are as follows: By setting the number of arc-shaped protrusions to 8 to 12 and symmetrically distributing them along the diagonal direction of the bottom surface of the upper pressure plate, and making the radius of the arc of each arc-shaped protrusion 1 / 8 to 1 / 6 of the diagonal length of the upper pressure plate, a multi-point balanced support for the surface of the honeycomb panel is achieved. The number of 8 to 12 arc-shaped protrusions ensures a sufficient number of support points while avoiding structural complexity caused by too many protrusions. The symmetrical distribution along the diagonal direction allows the pressure to be evenly transmitted from the center of the upper pressure plate to the surrounding area. The reasonable ratio between the arc radius and the diagonal length of the upper pressure plate ensures that each arc-shaped protrusion has an appropriate curvature, which can provide effective pressure dispersion without affecting the pressurization effect due to excessive or insufficient curvature, thereby improving the overall quality of the honeycomb panel curing and molding.

[0024] Furthermore, a heat-conducting pad layer is provided between the heating component and the lower pressure plate. The heat-conducting pad layer is made of aluminum alloy material. The top surface of the heat-conducting pad layer is completely attached to the bottom surface of the lower pressure plate, and the bottom surface of the heat-conducting pad layer is completely attached to the top surface of the heating component. The thickness of the heat-conducting pad layer is 1 / 2 to 1 / 4 of the thickness of the lower pressure plate.

[0025] The beneficial effects of adopting the above-mentioned improved scheme are as follows: By setting a thermally conductive pad made of aluminum alloy between the heating component and the lower pressure plate, with the top surface of the thermally conductive pad completely in contact with the bottom surface of the lower pressure plate and the bottom surface completely in contact with the top surface of the heating component, and the thickness of the thermally conductive pad being 1 / 2 to 1 / 4 of the thickness of the lower pressure plate, the excellent thermal conductivity of aluminum alloy is fully utilized. The thermally conductive pad can quickly and evenly transfer the heat generated by the heating component to the lower pressure plate. The completely in contact eliminates air gaps in the heat transfer process, avoiding an increase in thermal resistance. The reasonable thickness ratio ensures that the thermally conductive pad has sufficient thermal conductivity without increasing thermal inertia due to excessive thickness, thereby improving the heating response speed and temperature control accuracy. This allows the honeycomb panel to reach the required curing temperature in a shorter time and maintain temperature stability, improving production efficiency and curing quality.

[0026] Compared with existing technologies, the beneficial effects of the constant temperature pressurization device for curing and molding honeycomb panels provided by this utility model are as follows: This utility model achieves gradient pressure distribution and bidirectional encapsulation constraint on the honeycomb panel by setting multiple uniformly distributed arc-shaped protrusions with specific gradient distribution characteristics on the bottom surface of the upper pressure plate, in conjunction with the corresponding arc-shaped grooves on the top surface of the lower pressure plate. This effectively solves the problem of uneven force caused by traditional planar pressure plates. The array-distributed heating units ensure the uniformity of the temperature field inside the pressurization chamber. The combination of cylindrical connecting rods and circular through holes, as well as the threaded connection method, ensures the stability and adjustability of the lifting and lowering movement of the upper pressure plate. The device effectively constrains the honeycomb panel through continuous annular limiting flanges, meets real-time monitoring requirements through rectangular observation windows, optimizes the temperature distribution within the cavity and improves energy utilization efficiency through gradient insulation layers, and accelerates heat transfer and improves temperature control accuracy through aluminum alloy thermal pads. The entire device has a reasonable structure and complete functions, ensuring uniform stress and temperature in all parts of the honeycomb panel during the curing process. It significantly improves the overall quality, flatness, and uniformity of internal structural strength of the cured honeycomb panel, reduces the defect rate, and increases production efficiency, representing a significant technological advancement compared to existing technologies. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of a constant temperature and pressure device for curing and molding honeycomb panels;

[0029] Figure 2 This is a schematic diagram of the bottom surface of the upper pressure plate;

[0030] Figure 3 A schematic diagram of the side wall of the pressurized chamber;

[0031] The attached diagram lists the components represented by each number as follows:

[0032] 10. Pressurized chamber; 11. Insulation layer; 20. Heating component; 30. Pressure plate assembly; 31. Upper pressure plate; 32. Lower pressure plate; 33. Connecting rod. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0034] like Figure 1-3 The diagram shows a schematic of a constant temperature pressurization device for curing honeycomb panels according to this invention. The device includes a pressurization chamber 10, a heating component 20, and a pressure plate assembly 30. The pressurization chamber is a rectangular box structure with an insulation layer 11 on its inner wall. The heating component is fixedly installed on the bottom inner wall of the pressurization chamber. The pressure plate assembly is located inside the pressurization chamber and above the heating component. The pressure plate assembly includes an upper pressure plate 31 and a lower pressure plate 32, which are arranged opposite to each other. The lower pressure plate is in contact with the top surface of the heating component. The upper pressure plate is connected to the top inner wall of the pressurization chamber via a connecting rod 33. The connecting rod extends vertically, allowing the upper pressure plate to move up and down relative to the lower pressure plate along the axial direction of the connecting rod. The bottom surface of the upper pressure plate has multiple evenly distributed arc-shaped protrusions with circular cross-sectional shapes. The distance between the lowest point of the arc-shaped protrusion and the bottom surface of the upper pressure plate gradually increases from the center to the edge of the upper pressure plate.

[0035] In the above technical solution, the top surface of the lower pressure plate is provided with an arc-shaped groove corresponding to the arc-shaped protrusion on the bottom surface of the upper pressure plate, and the cross-sectional shape of the arc-shaped groove matches the cross-sectional shape of the arc-shaped protrusion.

[0036] Furthermore, in the above technical solution, the heating component includes multiple heating units, which are arranged in an array along the length and width directions of the inner wall at the bottom of the pressurized cavity, with equal spacing between adjacent heating units.

[0037] Furthermore, in the above technical solution, the connecting rod is a cylindrical rod, and a circular through hole is opened at the center of the top surface of the upper pressure plate. The connecting rod passes through the circular through hole and is fixedly connected to the upper pressure plate by a threaded connection.

[0038] Furthermore, in the above technical solution, the edge of the upper pressure plate is provided with a downwardly extending limiting flange, the limiting flange having a continuous annular structure, and a fitting gap is formed between the inner wall surface of the limiting flange and the outer wall surface of the edge of the lower pressure plate.

[0039] Furthermore, in the above technical solution, the side wall of the pressurizing cavity is provided with an observation window, which is a rectangular opening, and the area of ​​the observation window accounts for 1 / 10 to 1 / 5 of the total area of ​​the side wall of the pressurizing cavity.

[0040] Furthermore, in the above technical solution, the insulation layer is made of aluminum silicate fiber felt material, and the thickness of the insulation layer gradually decreases from the bottom to the top of the inner wall of the pressurized cavity.

[0041] Furthermore, in the above technical solution, the lower pressure plate is a rectangular plate structure, with its long side parallel to the long side of the bottom inner wall of the pressurizing cavity, and its short side parallel to the short side of the bottom inner wall of the pressurizing cavity.

[0042] Furthermore, in the above technical solution, the number of arc-shaped protrusions is 8 to 12, and the arc-shaped protrusions are symmetrically distributed along the diagonal direction of the bottom surface of the upper pressure plate. The radius of the arc of each arc-shaped protrusion is 1 / 8 to 1 / 6 of the length of the diagonal of the upper pressure plate.

[0043] Furthermore, in the above technical solution, a heat-conducting pad layer is provided between the heating component and the lower pressure plate. The heat-conducting pad layer is made of aluminum alloy material. The top surface of the heat-conducting pad layer is completely attached to the bottom surface of the lower pressure plate, and the bottom surface of the heat-conducting pad layer is completely attached to the top surface of the heating component. The thickness of the heat-conducting pad layer is 1 / 2 to 1 / 4 of the thickness of the lower pressure plate.

[0044] The following is a specific embodiment 1 of this utility model. The constant temperature and pressure device for curing honeycomb panels in this embodiment is applied to the production and manufacturing of aerospace-grade aluminum honeycomb panels. The pressure chamber is welded from high-quality steel plates, and its internal dimensions are 1200mm long, 800mm wide, and 600mm high, capable of accommodating honeycomb panels of various specifications for curing. The insulation layer laid on the inner wall of the pressure chamber is made of aluminum silicate fiber felt, which has excellent heat insulation performance and high temperature resistance, with an operating temperature range of 800℃~1200℃. The thickness of the insulation layer at the bottom of the pressure chamber is 50mm, gradually decreasing upwards along the inner wall, dropping to 30mm at the top. This gradient thickness distribution effectively optimizes the cavity. The internal temperature field distribution is achieved through a heating assembly consisting of 16 resistance heating units, each with a rated power of 2000 watts. These units are evenly distributed in a 4x4 array at the bottom of the pressure chamber, with a center-to-center spacing of 250mm between adjacent units. The heating unit shells are made of stainless steel and filled with nickel-chromium alloy heating wires, featuring rapid heating and precise temperature control. The lower pressure plate is made of high-strength aluminum alloy, with dimensions of 1100mm in length, 700mm in width, and 40mm in thickness. Its rectangular plate structure facilitates a complete fit with the top surface of the heating assembly. The top surface of the lower pressure plate has 10 evenly distributed arc-shaped grooves, each with a circular arc cross-section and a radius of 60mm. The groove depth is... The upper pressure plate is 15mm thick and is also made of high-strength aluminum alloy. Its dimensions are the same as the lower pressure plate. The bottom surface of the upper pressure plate has 10 arc-shaped protrusions that correspond one-to-one with the arc-shaped grooves on the lower pressure plate. The cross-sectional shape of the arc-shaped protrusions is circular with a radius of 60mm. The arc-shaped protrusion at the center of the upper pressure plate is 30mm high, and the height gradually increases to 45mm along the diagonal towards the edge, forming a clear gradient distribution. The edge of the upper pressure plate has a continuous annular limiting flange with a height of 80mm. The fit clearance between the inner wall of the flange and the outer wall of the lower pressure plate is 5mm. The connecting rod is made of high-strength stainless steel, with a diameter of 40mm and a length of 800mm. The upper end of the connecting rod passes through a... The flange is fixed to the inner top wall of the pressurizing chamber, and its lower end is connected to the circular through hole in the center of the top surface of the upper pressure plate via an M36 thread. The threaded connection depth between the connecting rod and the upper pressure plate is 60mm to ensure a firm and reliable connection. The thermal pad is made of 15mm thick aluminum alloy sheet, and its planar dimensions are the same as those of the lower pressure plate. The top surface of the thermal pad is completely bonded to the bottom surface of the lower pressure plate with thermally conductive silicone grease, and the bottom surface is also completely bonded to the top surface of the heating component with thermally conductive silicone grease, effectively eliminating contact thermal resistance. A rectangular observation window is provided on the right side wall of the pressurizing chamber, with dimensions of 400mm in length and 300mm in width, accounting for 15% of the total area of ​​the side wall. The observation window is sealed with high-temperature tempered glass, which satisfies the observation requirements while maintaining the airtightness of the chamber.In practical use, an aluminum honeycomb panel measuring 1000mm*600mm and 20mm thick is placed on the top surface of the lower pressure plate. The heating assembly is activated to raise the temperature inside the cavity to 120℃ and maintain it stably. Then, the hydraulic drive system is activated to lower the upper pressure plate at a speed of 5mm per second. When the arc-shaped protrusion on the bottom surface of the upper pressure plate contacts the honeycomb panel surface, pressure is applied to 0.5 MPa and maintained for 60 minutes. During this process, the epoxy resin adhesive inside the honeycomb panel cures under constant temperature and pressure conditions. After curing, heating is stopped and the upper pressure plate is raised back to its original position. After the temperature drops to room temperature, the honeycomb panel is removed. Testing shows that the surface flatness error of the honeycomb panel is less than 0.3mm, the density uniformity of each part is good, and the compressive strength meets the design requirements. The entire device operates stably and reliably, is simple and efficient to operate, and is suitable for mass production applications.

[0045] The following is another specific embodiment 2 of this utility model. In this embodiment 2, based on embodiment 1, the number of arc-shaped protrusions on the bottom surface of the upper pressure plate is increased to 12. The arc-shaped protrusions are symmetrically distributed along the diagonal direction of the bottom surface of the upper pressure plate. The radius of the arc of each arc-shaped protrusion is adjusted to 1 / 7 of the length of the diagonal of the upper pressure plate, which is about 180mm. The height of the arc-shaped protrusion located at the center of the upper pressure plate is 25mm. The heights of the four arc-shaped protrusions that increase sequentially towards the edge are 30mm, 35mm, 40mm and 50mm respectively, forming a more delicate gradient distribution. Correspondingly, the number of arc-shaped grooves on the top surface of the lower pressure plate is also adjusted to 12. The cross-sectional shape and size of the grooves are precisely matched with the arc-shaped protrusions of the upper pressure plate. This improvement makes the pressure distribution more uniform and delicate, and is particularly suitable for high-precision honeycomb panel products with extremely high requirements for surface flatness. Practical use has verified that the surface flatness error of the honeycomb panel cured by the device of embodiment 2 can be controlled within 0.15mm, and the density uniformity and strength consistency are better than those of embodiment 1.

[0046] The following is another specific embodiment 3 of this utility model. Embodiment 3 is based on Embodiment 1, by adding an 8mm thick flexible graphite heat-conducting sheet between the heating component and the heat-conducting pad. The flexible graphite heat-conducting sheet has excellent thermal conductivity and a certain degree of flexibility, which can better fill the tiny unevenness on the surface of the heating component, further reducing contact thermal resistance. At the same time, the thickness of the bottom of the insulation layer is increased to 60mm, while the top thickness remains unchanged at 30mm, further optimizing the gradient ratio. This improvement significantly enhances the insulation performance of the pressurized cavity, reduces heat loss by approximately 20%, increases the heating rate by approximately 15%, and improves temperature stability, making it particularly suitable for… For honeycomb panel products requiring longer curing times, actual testing showed that the device in Example 3 reduced energy consumption by approximately 18% under the same process conditions, and controlled temperature fluctuations within ±2℃, significantly better than the ±5℃ temperature fluctuation range of Example 1. Furthermore, due to the more uniform temperature distribution, the consistency of the internal structural strength of the cured honeycomb panel was further improved. Shear strength test results showed that the deviation of values ​​at each test point was less than 3%, indicating that the improved scheme in Example 3 has significant advantages in energy saving, consumption reduction, and improved product quality. It is particularly suitable for high-end honeycomb panel production applications with strict requirements for energy consumption control and product quality.

[0047] Specifically, the principle of this invention is as follows: This invention employs a special arc-shaped protrusion structure design on the bottom surface of the upper pressure plate. Utilizing the gradient distribution characteristic where the distance between the lowest point of the arc-shaped protrusion and the bottom surface of the upper pressure plate gradually increases from the center to the edge, when the upper pressure plate moves downwards to apply pressure to the honeycomb panel, the arc-shaped protrusion first contacts the center of the honeycomb panel. As the upper pressure plate continues to press down, due to the gradient distribution of the arc-shaped protrusion's height, the pressure is gradually transmitted to the edge of the honeycomb panel. This gradient pressure transmission method can compensate for the pressure difference between the center and edge caused by the flat pressure plate, achieving uniform force distribution across the entire honeycomb panel surface. Simultaneously, the arc-shaped cross-section of the arc-shaped protrusion forms line contact or small-area contact when it contacts the honeycomb panel surface, which, compared to flat contact, better adapts to minor unevenness on the honeycomb panel surface, reducing stress concentration. The phenomenon is that the arc-shaped groove on the top surface of the lower pressure plate, corresponding to the arc-shaped protrusion of the upper pressure plate, allows the honeycomb panel to be covered and constrained by the upper and lower arc-shaped structures during the pressurization process, forming a stable positioning and support, preventing the honeycomb panel from lateral movement or warping deformation. The array-distributed heating units ensure the uniformity of temperature in all areas inside the pressurization chamber, avoiding local overheating or underheating, allowing the adhesive to cure synchronously throughout the entire honeycomb panel, ensuring consistent curing quality. The setting of the heat-conducting pad layer further improves the heat transfer efficiency, shortens the heating time, and improves the response speed and accuracy of temperature control. Through structural optimization and functional integration, the entire device works synergistically from multiple aspects such as pressure distribution, temperature uniformity, and positioning stability, fundamentally solving the technical problem of uneven stress during the curing and molding of honeycomb panels in existing technologies.

[0048] In use, first place the honeycomb panel to be cured on the top surface of the lower pressure plate, ensuring that the center of the honeycomb panel is aligned with the center of the arc-shaped groove on the top surface of the lower pressure plate. Then, start the heating assembly. Each heating unit in the heating assembly starts heating simultaneously. The heat is quickly and evenly transferred to the lower pressure plate through the heat-conducting pad layer, and then transferred from the lower pressure plate to the honeycomb panel. At the same time, the heating power is adjusted by the control system to gradually raise the temperature in the pressurized chamber to the process temperature required for the curing of the honeycomb panel. When the temperature reaches the set value and stabilizes, start the drive mechanism to move the connecting rod to move the upper pressure plate vertically downwards. The arc-shaped protrusion on the bottom surface of the upper pressure plate first connects to the upper pressure plate. When the upper pressure plate reaches the center of the honeycomb panel surface, it continues to press down, and the arc-shaped protrusions gradually apply pressure to the honeycomb panel. Due to the gradient distribution of the height of the arc-shaped protrusions, the pressure is evenly transmitted from the center to the edge. When the upper pressure plate is pressed down to the set position, the honeycomb panel begins to solidify under the combined action of gradient pressure and constant temperature. During the solidification process, the operator monitors the status of the honeycomb panel in real time through the observation window. After solidification is completed, heating is stopped and the upper pressure plate is raised to reset. After the temperature inside the pressurized chamber drops to room temperature, the solidified honeycomb panel is taken out. The whole operation process is simple and efficient, ensuring the quality and efficiency of honeycomb panel solidification.

Claims

1. A constant temperature pressurization device for curing honeycomb panels, comprising a pressurization cavity, a heating component, and a pressure plate assembly, wherein the pressurization cavity is a cuboid box structure, the inner wall of the pressurization cavity is provided with a heat insulation layer, the heating component is fixedly installed on the bottom inner wall of the pressurization cavity, the pressure plate assembly is located inside the pressurization cavity and above the heating component, the pressure plate assembly includes an upper pressure plate and a lower pressure plate, the upper pressure plate and the lower pressure plate are arranged opposite to each other, the lower pressure plate is in close contact with the top surface of the heating component, the upper pressure plate is connected to the top inner wall of the pressurization cavity through a connecting rod, the connecting rod extends in a vertical direction, and the upper pressure plate is capable of moving up and down relative to the lower pressure plate in the axial direction of the connecting rod, characterized in that... The bottom surface of the upper pressure plate is provided with multiple evenly distributed arc-shaped protrusions. The cross-sectional shape of the arc-shaped protrusions is circular arc. The distance between the lowest point of the arc-shaped protrusion and the bottom surface of the upper pressure plate gradually increases from the center of the upper pressure plate to the edge.

2. The constant temperature and pressure device for curing and molding honeycomb panels according to claim 1, characterized in that, The top surface of the lower pressure plate is provided with an arc-shaped groove corresponding to the arc-shaped protrusion on the bottom surface of the upper pressure plate, and the cross-sectional shape of the arc-shaped groove matches the cross-sectional shape of the arc-shaped protrusion.

3. The constant temperature and pressure device for curing and molding honeycomb panels according to claim 2, characterized in that, The heating assembly includes multiple heating units, which are arranged in an array along the length and width of the inner wall at the bottom of the pressurized cavity, with equal spacing between adjacent heating units.

4. The constant temperature and pressure device for curing and molding honeycomb panels according to claim 3, characterized in that, The connecting rod is a cylindrical rod. A circular through hole is provided at the center of the top surface of the upper pressure plate. The connecting rod passes through the circular through hole and is fixedly connected to the upper pressure plate by a threaded connection.

5. The constant temperature and pressure device for curing and molding honeycomb panels according to claim 4, characterized in that, The upper pressure plate has a downwardly extending limiting flange at its edge. The limiting flange has a continuous annular structure, and a fitting gap is formed between the inner wall of the limiting flange and the outer wall of the lower pressure plate.

6. The constant temperature and pressure device for curing and molding honeycomb panels according to claim 5, characterized in that, The side wall of the pressurized cavity is provided with an observation window. The observation window is a rectangular opening, and the area of ​​the observation window accounts for 1 / 10 to 1 / 5 of the total area of ​​the side wall of the pressurized cavity.

7. The constant temperature and pressure device for curing and molding honeycomb panels according to claim 6, characterized in that, The insulation layer is made of aluminum silicate fiber felt material, and the thickness of the insulation layer gradually decreases from the bottom to the top of the inner wall of the pressurized cavity.

8. The constant temperature and pressure device for curing and molding honeycomb panels according to claim 7, characterized in that, The lower pressure plate is a rectangular plate structure, with its long side parallel to the long side of the bottom inner wall of the pressurizing cavity, and its short side parallel to the short side of the bottom inner wall of the pressurizing cavity.

9. The constant temperature and pressure device for curing and molding honeycomb panels according to claim 8, characterized in that, The number of the arc-shaped protrusions is 8 to 12, and the arc-shaped protrusions are symmetrically distributed along the diagonal direction of the bottom surface of the upper pressure plate. The radius of the arc of each arc-shaped protrusion is 1 / 8 to 1 / 6 of the length of the diagonal of the upper pressure plate.

10. The constant temperature and pressure device for curing and molding a honeycomb panel according to claim 9, characterized in that, A thermally conductive pad is provided between the heating component and the lower pressure plate. The thermally conductive pad is made of aluminum alloy. The top surface of the thermally conductive pad is completely in contact with the bottom surface of the lower pressure plate, and the bottom surface of the thermally conductive pad is completely in contact with the top surface of the heating component. The thickness of the thermally conductive pad is 1 / 2 to 1 / 4 of the thickness of the lower pressure plate.

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