Aluminum honeycomb panel with multi-level noise reduction and its forming process

Abstract

The present invention relates to an aluminum honeycomb panel capable of multi-level noise reduction and its forming process. A back plate, a front plate, and a honeycomb core bonded between the two plates are provided, and sound insulation cotton is placed in the honeycomb pores of the honeycomb core using a high-temperature melting process. A hollow plate formed by bonding an aluminum concave plate and an aluminum straight plate is provided, which is connected to the honeycomb core through the hollow plate, and a negative pressure is formed within the honeycomb core, allowing the sound insulation cotton to enter the honeycomb core. The present invention utilizes a high-temperature resistant epoxy resin adhesive and heats the honeycomb core during processing, enabling it to melt the sound insulation cotton. The entire piece of sound insulation cotton, melted at high temperature and under negative pressure adsorption, enters the honeycomb pores, and its shape is fully compatible with the shape of the honeycomb pores. Furthermore, the hollow back plate is used to further reduce noise, achieving multi-level noise reduction capabilities through honeycomb noise reduction, sound insulation cotton noise reduction, and hollow back plate noise reduction.

Description

Technical Field

[0001] The invention belongs to the technical field of aluminum honeycomb panels, and particularly relates to an aluminum honeycomb panel capable of multi-stage noise reduction and a forming process thereof. Background Art

[0002] Aluminum honeycomb panels are suitable for civil construction, vehicle and ship decoration, etc. They are the application of aviation and aerospace materials in the field of civil construction. The entire processing process is completed in a modern factory. In the production process, a bending machine is used to bend the aluminum foil strips, and then a hot press is used to heat-press and bond the aluminum foil strips back to back to form a honeycomb core. The two sides of the honeycomb core are then heat-pressed and bonded to the panel to form the aluminum honeycomb panel.

[0003] Existing aluminum honeycomb panels have honeycomb holes inside, and the compartments of the honeycomb holes have a certain noise reduction function. In order to further improve the noise reduction effect of the aluminum honeycomb panels, some aluminum honeycomb panels fill the honeycomb holes with sound-absorbing cotton. However, there are a large number of honeycomb holes, and each honeycomb hole may have an irregular shape or be slightly deformed during the stretching process. Therefore, filling each honeycomb hole with sound-absorbing cotton one by one is a huge workload, and it is not possible to fill the sound insulation cotton with a suitable shape according to the shape of the honeycomb hole. Summary of the Invention

[0004] The purpose of the present invention is to provide an aluminum honeycomb panel capable of multi-level noise reduction and a forming process thereof in order to solve the above problems.

[0005] The present invention achieves the above-mentioned object through the following technical solution: A forming process of an aluminum honeycomb panel capable of multi-stage noise reduction comprises the following steps:

[0006] S1: A third adhesive is used to stagger the aluminum foil, which is then cured at high temperature and then cut and stretched to form a honeycomb core.

[0007] S2: The aluminum plate raw material is formed into an aluminum straight plate and an aluminum concave plate by a machine, and a plurality of connecting ribs are welded on the concave surface of the aluminum concave plate. A through hole is formed on the surface of the aluminum straight plate, so that a negative pressure connection port is formed at the edge of the aluminum concave plate. The aluminum straight plate and the aluminum concave plate are assembled to form a hollow plate. The hollow plate is connected to the outside through the negative pressure connection port and is sealed and connected with a second adhesive. The connecting piece and the surface of the aluminum straight plate are also adhered to the second adhesive to form a back plate;

[0008] S3: Use the first adhesive to bond one side of the aluminum straight plate in the back panel to the honeycomb core. Then, heat the honeycomb core to 250-280°C. After removing it from the heat source, connect the external negative pressure device to the negative pressure connection port to generate negative pressure in the honeycomb core. Then, place sound insulation cotton in the opening of the honeycomb core. Under the high temperature, the sound insulation cotton melts and is sucked into the pores of the honeycomb core by the negative pressure.

[0009] S4: After the honeycomb core cools down to room temperature, the opening of the honeycomb core is cleaned, and the face plate and the honeycomb core are bonded together using the fourth adhesive to form a finished aluminum honeycomb panel.

[0010] As a preferred solution, the first adhesive, the second adhesive, and the third adhesive are all high-temperature resistant epoxy resin adhesives.

[0011] As a preferred solution, the fourth adhesive is one of epoxy resin adhesive and polyurethane curing adhesive.

[0012] As a preferred solution, in step S3, the sound insulation cotton is made of polyester fiber.

[0013] As a preferred solution, the method further includes step S5: using an aluminum component to bond and fill the negative pressure connection port, or using a foaming agent to fill the negative pressure connection port.

[0014] As a preferred solution, in step S3, the honeycomb core is heated to 270°C.

[0015] The present invention also provides an aluminum honeycomb panel capable of multi-level noise reduction, which is manufactured using the above process.

[0016] The beneficial effects of the present invention are:

[0017] By using high-temperature resistant epoxy resin glue, the honeycomb core is heated during processing to enable it to have the ability to melt the sound insulation cotton. The entire piece of sound insulation cotton is melted at high temperature and enters the honeycomb hole under negative pressure adsorption, and its shape is completely adapted to the shape of the honeycomb hole. In combination with the hollow back panel, further noise reduction is achieved, achieving the multi-level noise reduction capability of honeycomb noise reduction, sound insulation cotton noise reduction, and hollow back panel noise reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a side sectional view of the aluminum honeycomb panel of the present invention;

[0019] Figure 2 This is an exploded side view of the aluminum honeycomb panel of the present invention;

[0020] Figure 3 is a schematic diagram of the honeycomb core of the present invention;

[0021] Figure 4 The present invention Figure 1 A magnified view of the structure of part A;

[0022] In the figure: 1. Back panel; 101. Aluminum concave plate; 102. Aluminum straight plate; 103. Through hole; 104. First adhesive; 105. Connecting rib; 106. Negative pressure connection port; 107. Second adhesive; 2. Honeycomb core; 201. Third adhesive; 3. Sound insulation cotton; 4. Panel; 401. Fourth adhesive. DETAILED DESCRIPTION

[0023] The present application is described in further detail below in conjunction with the accompanying drawings. It is necessary to point out that the following specific implementation methods are only used to further illustrate the present application and cannot be understood as limiting the scope of protection of the present application. Technicians in this field can make some non-essential improvements and adjustments to the present application based on the above application content.

[0024] Example 1

[0025] like Figure 1-4 As shown, a forming process of an aluminum honeycomb panel capable of multi-stage noise reduction includes the following steps:

[0026] S1: A third adhesive 201 is used to dislocation-bond the aluminum foil, and after high-temperature curing, the aluminum foil is cut and stretched to form a honeycomb core 2. The third adhesive 201 is a high-temperature resistant epoxy resin glue.

[0027] S2: The aluminum plate raw material is formed by a machine into an aluminum straight plate 102 and an aluminum concave plate 101, and a plurality of connecting ribs 105 are welded on the concave surface of the aluminum concave plate 101. A through hole 103 is formed on the surface of the aluminum straight plate 102, and a negative pressure connection port 106 is formed at the edge of the aluminum concave plate 101. The aluminum straight plate 102 and the aluminum concave plate 101 are assembled to form a hollow plate. The hollow plate is connected to the outside through the negative pressure connection port 106 and is sealed and connected with a second adhesive 107. The connecting piece 105 and the surface of the aluminum straight plate 102 are also adhered to each other by the second adhesive 107 to form a back plate 1. The second adhesive 107 is a high-temperature resistant epoxy resin glue.

[0028] S3: Using a first adhesive 104, one side of the aluminum straight plate 102 in the back panel 1 is bonded to the honeycomb core 2. The honeycomb core 2 is then heated to 270°C. After being removed from the heat source, an external negative pressure device is connected to the negative pressure connection port 106 to generate negative pressure in the honeycomb core 2. Sound insulation cotton 3 is placed in the opening of the honeycomb core 2. The sound insulation cotton 3 is made of polyester fiber, which has a melting point of 240°C. At high temperatures, the sound insulation cotton 3 melts and is sucked into the pores of the honeycomb core 2 by the negative pressure. The first adhesive 104 is a high-temperature resistant epoxy resin glue.

[0029] S4: After the honeycomb core 2 cools to room temperature, the opening of the honeycomb core 2 is cleaned, and the press panel 4 and the honeycomb core 2 are bonded together using a fourth adhesive 401 to form a finished aluminum honeycomb panel. The fourth adhesive 401 is epoxy resin glue.

[0030] Step S5: using an aluminum component to bond and fill the negative pressure connection port 106, or using a foaming agent to fill the negative pressure connection port 106.

[0031] Example 2

[0032] The difference from Example 1 is that in step S3, the honeycomb core 2 is heated to 250°C.

[0033] Example 3

[0034] The difference from Example 1 is that in step S3, the honeycomb core 2 is heated to 260°C.

[0035] Example 4

[0036] The difference from Example 1 is that in step S3, the honeycomb core 2 is heated to 280°C.

[0037] Comparative Example 1

[0038] The difference from Example 1 is that in step S3, the honeycomb core 2 is heated to 290°C.

[0039] Comparative Example 2

[0040] Using conventional production technology, sound insulation cotton 3 is added to each honeycomb hole one by one.

[0041] The aluminum honeycomb panels obtained in Examples 1-4 and Comparative Examples 1-2 were subjected to a noise reduction test. The aluminum honeycomb panels were enclosed in a closed space, and the noise difference between the inside and outside of the aluminum honeycomb panels was measured using a decibel meter. The third adhesive 201 was also subjected to a peel strength test according to ASTM D903-98. The experimental results are as follows.

[0042]

[0043] It can be seen that in Example 1, the sound insulation cotton 3 is melted at high temperature to enter the honeycomb core 2, and the fit is higher. Compared with Comparative Example 2, the sound insulation effect is better and the process is simpler.

[0044] It can be seen from Comparative Example 1 that although high-temperature resistant epoxy resin glue is used, when the temperature of the honeycomb core 2 is too high, such as in Example 4 and Comparative Example 1, the fastness of the high-temperature resistant epoxy resin glue will be partially affected, and the aluminum honeycomb core 2 will excessively melt the sound insulation cotton 3, resulting in a decrease in the noise reduction effect. When the temperature of the honeycomb core 2 is low, such as in Examples 2-3, its melting effect on the sound insulation cotton is poor, and it is easy for a small amount of sound insulation cotton 3 to fail to completely enter the honeycomb core 2 during production.

[0045] The present invention also provides an aluminum honeycomb panel capable of multi-level noise reduction, which is manufactured using the above process.

[0046] The above-described embodiments merely illustrate several implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, and all such variations and improvements fall within the scope of protection of the present invention.

Claims

1. A forming process for an aluminum honeycomb panel capable of multi-stage noise reduction, characterized in that: The steps include: S1: using a third adhesive (201) to dislocation-bond the aluminum foil, curing it at high temperature, and then cutting and stretching it to form a honeycomb core (2); S2: forming the aluminum plate raw material into an aluminum straight plate (102) and an aluminum concave plate (101) through a machine, and welding a plurality of connecting ribs (105) on the concave surface of the aluminum concave plate (101), forming a through hole (103) on the surface of the aluminum straight plate (102), forming a negative pressure connection port (106) at the edge of the aluminum concave plate (101), and splicing the aluminum straight plate (102) and the aluminum concave plate (101) to form a hollow plate, the hollow plate being connected to the outside through the negative pressure connection port (106), and being sealed and connected with a second adhesive (107), wherein the connecting ribs (105) and the surface of the aluminum straight plate (102) are also adhered to each other through the second adhesive (107), thereby forming a back plate (1); S3: Using a first adhesive (104) to bond one side of the aluminum straight plate (102) in the back plate (1) to the honeycomb core (2), then heating the honeycomb core (2) to 250-280°C, and after removing it from the heat source, connecting it to the negative pressure connection port (106) using an external negative pressure device to generate negative pressure in the honeycomb core (2), and placing sound insulation cotton (3) at the opening of the honeycomb core (2). The sound insulation cotton (3) melts at high temperature and is sucked into the holes of the honeycomb core (2) by the negative pressure; S4: After the honeycomb core (2) is cooled to room temperature, the opening of the honeycomb core (2) is cleaned, and the press panel (4) and the honeycomb core (2) are bonded together using a fourth adhesive (401) to form a finished aluminum honeycomb panel; The first adhesive (104), the second adhesive (107), and the third adhesive (201) are all high-temperature resistant epoxy resin adhesives; in step S3, the material of the sound insulation cotton (3) is polyester fiber.

2. The forming process of the aluminum honeycomb panel capable of multi-stage noise reduction according to claim 1, characterized in that: The fourth adhesive (401) is one of epoxy resin adhesive and polyurethane curing adhesive.

3. The forming process of the aluminum honeycomb panel capable of multi-stage noise reduction according to claim 1, characterized in that: The method further comprises step S5: using an aluminum component to bond and fill the negative pressure connection port (106), or using a foaming agent to fill the negative pressure connection port (106).

4. The forming process of the aluminum honeycomb panel capable of multi-stage noise reduction according to claim 1, characterized in that: In step S3, the honeycomb core (2) is heated to 270°C.

5. An aluminum honeycomb panel capable of multi-stage noise reduction manufactured by the process according to any one of claims 1 to 4.

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