Process method for thermally breaking adhesive film on surface of honeycomb structure

Abstract

The invention discloses a process method for thermally breaking an adhesive film on the surface of a honeycomb structure, and belongs to the technical field of aerospace composite material production, the process method comprises the following steps: S1, adhesive film paving: paving the adhesive film on the surface of a honeycomb; s2, physically breaking the film, namely breaking a hole in the adhesive film by using a tool; s3, thermally breaking the adhesive film, setting a heating route, heating the surface of the adhesive film through a heating lamp, and enabling the adhesive film to be heated and shrunk in the heating process of the heating lamp and to be shrunk and adhered to the honeycomb wall from a broken hole; and S4, repeating the steps S1 to S3, and carrying out adhesive film thermal breaking treatment on the back surface of the honeycomb. According to the invention, the heating temperature of the adhesive film during thermal breaking of the adhesive film can be effectively controlled, the adhesive film can be uniformly distributed on the edges of the honeycomb wall, and the possible problems of non-uniform wall hanging of the adhesive film, non-uniform heating, adhesion of the adhesive film to the honeycomb vertical wall and the like in a traditional hot air thermal breaking method are avoided.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of aerospace composite material production, and particularly relates to a process method for hot breaking of a surface adhesive film of a honeycomb structure. BACKGROUND

[0002] In the production of a honeycomb sandwich, an adhesive is often used to bond the material in contact with the upper and lower surfaces of the honeycomb. Among the adhesives used, the hot broken adhesive film can be uniformly distributed on the honeycomb edge through the hot breaking process, which has the following advantages: the adhesive tumor formed after hot breaking increases the effective bonding area of the skin and the honeycomb core material; the adhesive film after hot breaking reduces the residual adhesive on the surface of the skin. The bonding strength is increased, and the product weight is reduced, which has great significance for some honeycomb sandwich parts with strict weight requirements.

[0003] The hot breaking process of the adhesive film is the process of shrinking the adhesive film to the honeycomb edge under a certain heat. The traditional method uses hot air to break the adhesive film. The hot air provides heat, and at the same time, the wind force will apply force to the adhesive film to blow a hole in the complete adhesive film, so that the adhesive film shrinks from the broken hole to the honeycomb edge. However, during the blowing process, the hot breaking of the adhesive film may be uneven due to the blowing, the adhesive film may be pasted on the honeycomb vertical wall due to the wind force, the surface temperature of the heated adhesive film may be difficult to observe due to the wind force, and other problems. SUMMARY

[0004] The purpose of the present application is to provide a process method for hot breaking of the adhesive film on the surface of the honeycomb structure to solve the problems existing in the prior art.

[0005] To achieve the above purpose, the present application provides the following scheme: the present application provides a process method for hot breaking of the adhesive film on the surface of the honeycomb structure, comprising the following steps:

[0006] S1, laying adhesive film, laying adhesive film on the surface of the honeycomb;

[0007] S2, physically breaking the film, breaking a hole in the adhesive film using a tool;

[0008] S3, hot breaking of the adhesive film, setting a heating route, heating the surface of the adhesive film by a heating lamp, and the adhesive film shrinks and adheres to the honeycomb wall from the broken hole during the heating process of the heating lamp;

[0009] S4, repeating steps S1-S3 to perform hot breaking treatment of the adhesive film on the back surface of the honeycomb.

[0010] Optionally, in step S1, the adhesive film sinks under its own weight, and the outline of the honeycomb is visible to the naked eye on the adhesive film.

[0011] Optionally, in step S2, the hole position of the adhesive film is the center of the honeycomb outline.

[0012] Optionally, the surface temperature of the adhesive film is controlled by the power of the heating lamp, the irradiation time of the heating lamp, the moving speed of the heating lamp, and the distance between the heating lamp and the surface of the adhesive film.

[0013] Optionally, the surface temperature of the adhesive film is monitored in real time by an infrared temperature measuring device.

[0014] Optionally, after the moving route of the heating lamp is set, the heating lamp moves at a constant speed according to the preset route.

[0015] Optionally, in step S2, the tool is a sharp tool or a cutting tool.

[0016] The present application discloses the following technical effects: the physical hole breaking provides a stress release channel for heat breaking and shrinking, the adhesive film shrinks from the hole breaking position and closely adheres to the honeycomb wall during heating, the problems of adhesive film blistering, wrinkling or separation caused by traditional overall heating are avoided, and the double-sided processing ensures that the adhesive films on both sides of the honeycomb structure can reliably adhere, thereby improving the overall strength and sealing performance of the composite structure. The present application can effectively control the heating temperature of the adhesive film during heat breaking, and can uniformly distribute the adhesive film on the edges of the honeycomb wall, thereby avoiding the problems of uneven adhesive film wall hanging, uneven heating, and adhesive film adhering to the honeycomb vertical wall that may exist in the traditional hot air heat breaking method. BRIEF DESCRIPTION OF DRAWINGS

[0017] The accompanying drawings, which form a part of this application, are included to provide a further understanding of the application and are incorporated in and constitute a part of this application. The embodiments of this application and its description together with the drawings make an attempt to provide a complete, but not exhaustive description of the application. In the drawings:

[0018] Figure 1 The figure is a schematic diagram of the effect of the honeycomb heat breaking of the present application;

[0019] Figure 2 The figure is a schematic diagram of the distribution structure of a single heating lamp of the present application;

[0020] Figure 3 The figure is a schematic diagram of the motion trajectory of a single heating lamp of the present application;

[0021] Figure 4 The figure is a schematic diagram of the distribution structure of multiple heating lamps of the present application.

[0022] In the figure: 1, honeycomb; 2, heating lamp. DETAILED DESCRIPTION

[0023] 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.

[0024] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0025] Reference Figures 1 to 4 As shown, this embodiment provides a process for thermally breaking the adhesive film on the surface of a honeycomb structure, including the following steps:

[0026] S1. Lay the adhesive film. Lay the prepared adhesive film on the surface of the honeycomb 1, covering the upper surface of the aluminum honeycomb 1. The adhesive film sinks due to its own weight, and the outline of the honeycomb 1 is visible to the naked eye on the adhesive film.

[0027] S2. Physical film breaking: Use a needle or utility knife to poke holes in the film, with the holes located at the exact center of the honeycomb outline 1 on the film; including but not limited to needles or utility knives, or film breaking tools with similar functions may also be used;

[0028] S3. Thermal breaking of the adhesive film: The heating route is set, and the surface of the adhesive film is heated by heating lamp 2. During the heating process, the adhesive film shrinks due to heat and adheres to the honeycomb 1 wall from the rupture point. The surface temperature of the adhesive film is detected by infrared thermometer, which can determine the appropriate parameters for different adhesive films.

[0029] S4. Repeat steps S1-S3 to perform thermal breaking treatment on the back of honeycomb 1.

[0030] The physical perforations provide stress release channels for thermal shrinkage. During heating, the adhesive film shrinks from the perforations and adheres tightly to the honeycomb 1 wall, avoiding problems such as bubbling, wrinkling, or detachment caused by traditional overall heating. Simultaneously, double-sided treatment ensures reliable adhesion of the adhesive film on both sides of the honeycomb 1 structure, improving the overall strength and sealing of the composite structure. This invention effectively controls the heating temperature of the adhesive film during thermal shrinkage and evenly distributes the film along the edges of the honeycomb 1 wall, avoiding problems such as uneven film adhesion, uneven heating, and film adhesion to the vertical walls of the honeycomb 1 that may occur with traditional hot air shrinkage methods.

[0031] Further optimizing the scheme, in step S2, the perforation location of the adhesive film is the exact center of the honeycomb 1 outline. Limiting the perforation location to the exact center of the honeycomb 1 outline ensures the symmetry and uniformity of the adhesive film shrinkage during thermal demolding. The central perforation guides the adhesive film to shrink uniformly radially along the honeycomb 1 wall, avoiding localized stress concentration or uneven shrinkage caused by eccentric perforations. This reduces defects such as tearing and wrinkling of the adhesive film, improving the flatness of the adhesion between the adhesive film and the honeycomb 1 wall and the structural stability after thermal demolding.

[0032] To further optimize the scheme, in step S3, the surface temperature of the adhesive film is controlled by the power of the heating lamp 2, the irradiation time of the heating lamp 2, the moving speed of the heating lamp 2, and the distance between the heating lamp 2 and the adhesive film surface.

[0033] By coordinating the power, irradiation duration, moving speed, and distance of the heating lamp 2 to control the surface temperature of the adhesive film, precise temperature control of the thermal breaking process is achieved. Specifically, there are two implementation scenarios: the first scenario involves the heating lamp moving along a pre-set route, such as... Figures 2-3 The higher the power, the higher the surface temperature of the heating lamp, and the faster the film heats up; the closer the distance, the faster the film heats up, and the higher the surface temperature of the film; the slower the moving speed, the longer the film is irradiated, and the higher the surface temperature of the film; the second type of heating lamp covers the film, such as... Figure 4 The higher the power, the higher the surface temperature of the heating lamp, and the faster the film heats up; the longer the irradiation time, the higher the surface temperature of the film; the closer the distance, the faster the film heats up, and the higher the surface temperature of the film. During implementation, adjustments are made according to the above principles, based on the required temperature, film characteristics, and ambient temperature. This multi-parameter adjustment method is adaptable to films of different materials and thicknesses, as well as honeycomb structures, ensuring that the film shrinks within the optimal temperature range (e.g., avoiding overheating degradation or insufficient shrinkage due to insufficient temperature), while improving the adaptability and repeatability of the process and reducing reliance on operational experience.

[0034] The solution was further optimized so that the surface temperature of the adhesive film was monitored in real time using an infrared thermometer.

[0035] Infrared thermography was introduced to monitor the surface temperature of the adhesive film in real time, thus constructing a closed-loop temperature control system. Real-time monitoring can provide immediate feedback on temperature deviations and dynamically adjust heating parameters (such as power and speed) to avoid temperature exceeding limits due to environmental fluctuations or equipment errors. This ensures that the thermal breaking process is always within a safe and effective temperature window, significantly improving process stability and product quality consistency.

[0036] The scheme was further optimized by setting the movement route of the heating lamp 2, which then moves at a constant speed along the preset route.

[0037] Heating lamp 2 moves at a uniform speed along a preset route, ensuring a uniform distribution of heating energy. Uniform movement avoids local overheating or underheating, allowing all areas of the adhesive film surface to experience the same thermal history simultaneously, resulting in a more uniform shrinkage process. This reduces stress differences, local detachment, or wrinkles in the adhesive film caused by uneven heating, further improving the uniformity of adhesion between the adhesive film and the honeycomb 1 wall after thermal breakage and the structural reliability.

[0038] Reference Figure 4 As shown, the heating lamps 2 consist of multiple light sources distributed to provide uniform illumination, covering the aluminum honeycomb 1. The surface temperature of the adhesive film is controlled by setting the power of the heating lamps 2, the illumination duration, and the height parameters between the lamp source and the adhesive film.

[0039] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0040] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A process for thermally breaking the adhesive film on the surface of a honeycomb structure, characterized in that, Includes the following steps: S1. Lay the adhesive film and lay the adhesive film on the surface of the honeycomb (1); S2. Physical film breaking: Use tools to make holes in the adhesive film; S3. Thermal breakage of the adhesive film: Set the heating route and heat the surface of the adhesive film through the heating lamp (2). During the heating process of the heating lamp (2), the adhesive film shrinks due to heat and shrinks from the hole to adhere to the honeycomb (1) wall. S4. Repeat steps S1-S3 to perform heat-breaking treatment on the back of the honeycomb (1).

2. The process for thermally breaking the adhesive film on the surface of a honeycomb structure according to claim 1, characterized in that: In step S1, the adhesive film sinks due to its own weight, and the outline of the honeycomb (1) is visible to the naked eye on the adhesive film.

3. The process for thermally breaking the adhesive film on the surface of a honeycomb structure according to claim 1, characterized in that: In step S2, the location of the perforation in the adhesive film is the exact center of the honeycomb (1) outline.

4. The process for thermally breaking the adhesive film on the surface of a honeycomb structure according to claim 1, characterized in that: In step S3, the surface temperature of the adhesive film is controlled by the power of the heating lamp (2), the irradiation time of the heating lamp (2), the moving speed of the heating lamp (2), and the distance between the heating lamp (2) and the adhesive film surface.

5. The process for thermally breaking the adhesive film on the surface of a honeycomb structure according to claim 4, characterized in that: The surface temperature of the adhesive film is monitored in real time using an infrared thermometer.

6. The process for thermally breaking the adhesive film on the surface of a honeycomb structure according to claim 4, characterized in that: After setting the movement route of the heating lamp (2), the heating lamp (2) moves at a constant speed along the preset route.

7. The process for thermally breaking the adhesive film on the surface of a honeycomb structure according to claim 1, characterized in that: In step S2, the tool is a sharp tool or a cutting tool.

Images