A method for positioning and installing honeycomb parts for aircraft acoustical liner manufacture

Abstract

The application provides a method for positioning and installing a honeycomb part for manufacturing an aircraft soundproofing pad, which comprises the following steps: manufacturing a semi-cylindrical inner skin, fixing the inner skin through positioning blocks and positioning rings; installing a honeycomb plate; sticking the outer surface of the inner skin and the edge of the honeycomb plate through hot melt glue; heating and melting the hot melt glue, and pressing the hot melt glue through a pressing block jig to make it cool and solidify. The application has the beneficial effects that: a connecting seam is formed between the positioning ring and the edge of the honeycomb plate, and a hot melt adhesive tape is pasted in the connecting seam, the hot melt adhesive tape has the advantages of convenient adhesion and easy width control, and the hot melt glue can be repeatedly pasted and hot-melted, which can effectively improve the bonding strength. In the method, the concave-convex cooperation is formed between the arc-shaped pressing block bottom and the outer wall of the inner skin, so that the positioning and installation can be easily realized, the rapid positioning of the honeycomb part can be realized, the product manufacturing time can be saved, and the part assembly precision can be improved.

Description

Technical Field

[0001] This invention relates to the technical field of aviation equipment manufacturing processes, and in particular to a method for positioning and installing honeycomb parts used in the manufacture of aircraft sound-absorbing pads. Background Technology

[0002] The aircraft's sound-absorbing pads are fully bonded metal honeycomb structures installed at the front of the engine nacelle. These pads feature a unique microporous structure; engine noise is reflected multiple times as it passes through the microporous area, gradually reducing its intensity and thus achieving noise reduction. The pads have a diameter of up to 1.8 meters. The main body of the sound-absorbing pad consists of an inner skin, an outer skin, and a metal honeycomb structure. The outer skin wraps around the inner skin, and the metal honeycomb skin is located between the inner and outer skins. During manufacturing, the honeycomb components need to be individually installed and positioned before being bonded together. No fasteners are used in this process, so precise positioning is crucial. Traditional installation methods involve measuring the distance between the triangular honeycomb and the edge of the outer skin with a steel ruler and positioning according to fixed dimensions. This method is time-consuming, requires repeated measurements, and is cumbersome. Summary of the Invention

[0003] In view of this, in order to improve the positioning accuracy of honeycomb parts in aircraft noise-absorbing pads and shorten the manufacturing cycle of noise-absorbing pads, the present invention provides a method for positioning and installing honeycomb parts in the manufacture of aircraft noise-absorbing pads, the method comprising the following steps:

[0004] S1: Make a semi-cylindrical inner skin and install the semi-cylindrical inner skin on the positioning block of the semi-cylindrical structure; install positioning rings on the surface of the inner skin, and fix the two ends of the positioning rings to the positioning block in a detachable manner to press and fix the inner skin.

[0005] S2: Lay the honeycomb panel at the designated position on the outer surface of the inner skin. The honeycomb panel is attached to the outer surface of the inner skin. Align the side of the honeycomb panel with the positioning ring so that the positioning ring and the edge of the honeycomb panel form a connection seam of fixed width.

[0006] S3: Add hot melt adhesive into the joint; the hot melt adhesive bonds the outer surface of the inner skin and the edge of the honeycomb panel within the joint.

[0007] S4: Heat the hot melt adhesive to melt it, and press it with a pressing jig to make the melted hot melt adhesive compact and accelerate its cooling and curing. The cooled and cured hot melt adhesive will bond the honeycomb panel to the surface of the semi-cylindrical inner skin, completing the fixation of one side of the honeycomb panel.

[0008] S5: Install the positioning ring on the other side of the honeycomb panel to complete the bonding of the other side of the honeycomb panel.

[0009] Furthermore, the method also includes step S6:

[0010] S6: The two halves of the outer cylindrical skin that have been glued together to form a complete inner cylindrical skin structure, and the outer skin structure is installed on the outer surface of the inner cylindrical skin structure to form a complete sound-absorbing pad.

[0011] Furthermore, in step S1, the inner skin is provided with flat connecting edges on both sides, the connecting edges are attached to the surface of the inner skin, and the connecting edges are located in the connecting seam.

[0012] Furthermore, the width of the connecting seam is 20-40mm, which is twice the width of the connecting edge of the honeycomb panel.

[0013] Furthermore, the hot melt adhesive is a hot melt adhesive tape, the width of which is equal to the width of the joint. The hot melt adhesive tape is pasted inside the joint, with part of the hot melt adhesive tape bonded to the outer surface of the inner skin of the joint gap, and the remaining part bonded to the joint edge of the honeycomb panel.

[0014] Furthermore, steps S3 and S4 are repeated multiple times to solidify multiple hot melt adhesives within the joint, thereby completing the fixation of one side of the honeycomb panel.

[0015] Furthermore, the process of heating the hot melt adhesive tape in step S4 is as follows: hot air is blown onto the hot melt adhesive tape through a blower device with a built-in heating component, thereby causing the hot melt adhesive tape to melt.

[0016] Furthermore, the pressing fixture in step S4 includes an arc-shaped pressing block and a connecting handle. The bottom of the arc-shaped pressing block is arc-shaped, and the bottom of the arc-shaped pressing block is pressed against the surface of the inner skin in the connecting gap. The width of the arc-shaped pressing block is equal to the width of the connecting gap.

[0017] Furthermore, the connecting handle includes a mounting plate, a connecting plate, and a handle. The mounting plate is connected to the arc-shaped pressure block, and the connecting plate connects the mounting plate and the handle.

[0018] Furthermore, both the curved pressure block and the connecting handle are made of aluminum.

[0019] The beneficial effects of the present invention, a method for positioning and installing honeycomb parts for manufacturing aircraft sound-absorbing pads, are as follows: The method includes the following steps: making a semi-cylindrical inner skin and fixing the inner skin with positioning blocks and positioning rings; installing honeycomb panels, so that the positioning rings and honeycomb panels are laid on the outer surface of the inner skin, and the edges of the positioning rings and honeycomb panels form a connecting seam; bonding the outer surface of the inner skin and the edges of the honeycomb panels with hot melt adhesive; heating and melting the hot melt adhesive, pressing it with a pressing jig, and then cooling and solidifying it.

[0020] In this method, a connection gap is formed between the positioning ring and the edge of the honeycomb panel, and the hot melt adhesive is positioned through the gap, which facilitates the positioning of the honeycomb panel bonding point. The hot melt adhesive is a hot melt adhesive tape, and the width of the hot melt adhesive is equal to the width of the connection gap. The hot melt adhesive tape has the advantages of easy adhesion and easy width control, avoiding the problems of traditional coating-type hot melt adhesives that require repeated application, are easy to stick to other parts, and are difficult to clean. At the same time, the hot melt adhesive can be repeatedly applied and melted, which can effectively improve the bonding strength.

[0021] The pressure block fixture in this method includes an arc-shaped pressure block and a connecting handle. The bottom of the arc-shaped pressure block forms a concave-convex fit with the outer wall of the inner skin, which can easily achieve positioning and installation. It can realize the rapid positioning of honeycomb parts, save product manufacturing time, and improve the assembly accuracy of parts. The product has a handle for easy handling by workers. The pressure block fixture is preferably made of aluminum, which can heat and cool the thermosetting adhesive after it has been melted, thereby improving the assembly efficiency of parts.

[0022] This method uses a blower with a built-in heating component to blow hot air onto the hot melt adhesive tape, thereby melting the hot melt adhesive tape. This heating method is convenient, quick, and highly efficient. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the connection structure between the inner skin 1 and the honeycomb plate 3 in an embodiment of the present invention;

[0024] Figure 2 This is a schematic diagram of the pressure block fixture in a method for positioning and installing honeycomb parts for manufacturing aircraft sound-absorbing pads according to an embodiment of the present invention;

[0025] In the diagram: 1-Inner skin, 2-Positioning ring, 3-Honeycomb panel, 31-Connecting edge, 4-Connecting seam, 5-Arc-shaped pressure block, 6-Mounting plate, 7-Connecting plate, 8-Handle. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0027] Please refer to Figure 1 The present invention discloses a method for positioning and installing honeycomb parts in the manufacture of aircraft sound-absorbing pads, which includes the following steps:

[0028] S1: Fabricate a semi-cylindrical inner skin 1. The inner skin 1 has a semi-cylindrical structure with a smooth inner wall. Install the semi-cylindrical inner skin 1 on a positioning block (not shown in the figure) with a semi-cylindrical structure. The outer wall of the positioning block fits against the inner wall of the inner skin 1. The positioning block supports the inner skin 1 and prevents local depressions in the inner skin 1. Install positioning rings on the surface of the inner skin 1. Fix the ends of the two positioning rings 2 on the positioning block. The positioning rings 2 clamp the inner skin 1 to prevent displacement of the inner skin 1 on the positioning block. The positioning rings 2 also serve as a positioning reference for the axis of the inner skin 1.

[0029] S2: The honeycomb panel 3 is laid on the designated position on the outer surface of the inner skin 1; wherein the honeycomb panel 3 is a rectangular honeycomb panel, the honeycomb panel 3 has a certain elasticity, and the honeycomb panel is elastically attached to the outer surface of the inner skin 1; the honeycomb panel 3 also has connecting edges 31 with flat structures on both sides.

[0030] Align the connecting edges 31 on both sides of the honeycomb panel 3 with the positioning ring, and make the positioning ring and the edge of the honeycomb panel form a connecting seam 4 of a fixed width. The width of the connecting seam 4 is preferably 20-40mm, and the width of the connecting seam 4 is twice the width of the connecting edge 31 of the honeycomb panel 3. At this time, the connecting edge 31 of the flat structure is close to the outer wall of the inner skin 1, and the connecting edge is located in the connecting seam.

[0031] S3: Hot melt adhesive is added to the joint. The hot melt adhesive is bonded to the connection 31 between the outer surface of the inner skin 1 and the edge of the honeycomb panel, thereby bonding the honeycomb panel to the inner skin 1. The positioning ring 2 prevents the hot melt adhesive from exceeding the positioning reference.

[0032] In this embodiment, the hot melt adhesive is a hot melt adhesive tape. The width of the hot melt adhesive is equal to the width of the connecting seam 4. The hot melt adhesive tape is pasted inside the connecting seam 4, so that part of the hot melt adhesive tape is bonded to the outer surface of the inner skin 1 inside the connecting seam 4, and the rest of the hot melt adhesive tape is bonded to the connecting edge 31 of the honeycomb panel 3. The hot melt adhesive tape has the advantages of easy bonding and easy width control, avoiding the problems of traditional coating-type hot melt adhesives that require repeated coating, are easy to stick to other parts, and are difficult to clean.

[0033] S4: Heat the hot melt adhesive tape to melt it, and press the hot melt adhesive tape with a pressing jig to make the melted hot melt adhesive tape compact and accelerate its cooling and solidification. The cooled and solidified hot melt adhesive tape will bond the honeycomb panel edge to the surface of the semi-cylindrical inner skin 1.

[0034] Understandably, in order to ensure that the hot melt adhesive connection is firm to the honeycomb panel and the inner skin, steps S3 and S4 can be repeated multiple times, so that multiple hot melt adhesives are cured in the connection seam, thereby completing the fixation of one side of the honeycomb panel;

[0035] S5: After fixing one side of the honeycomb panel 3, install the positioning ring 2 on the other side of the honeycomb panel 3 to form a new connecting seam on the other side of the honeycomb panel 3. Repeat steps S3 and S4 to fix the other side of the honeycomb panel 3, so that the honeycomb panel 3 is fixedly attached to the outer surface of the inner skin 1.

[0036] S6: The two completed honeycomb panels 3 semi-cylindrical skins are spliced ​​together to form a complete cylindrical inner skin. The honeycomb panels 3 on the two semi-cylindrical skins are joined together to form a cylindrical structure. The cylindrical structure includes an inner skin layer, an outer skin layer, and a honeycomb panel located between the inner skin layer and the outer skin layer. This cylindrical structure is the sound-absorbing pad.

[0037] Please refer to Figure 2 Preferably, the pressing fixture in step S4 includes an arc-shaped pressing block 5 and a connecting handle. The bottom of the arc-shaped pressing block 5 is arc-shaped and presses against the surface of the inner skin 1 within the connecting seam 4. The width of the arc-shaped pressing block 5 is equal to the width of the connecting seam 4. The connecting handle includes a mounting plate 6, a connecting plate 7, and a handle 8. The mounting plate 6 is connected to the arc-shaped pressing block 5 by screws or welding. The connecting plate 7 connects the mounting plate 6 and the handle 8. The bottom of the arc-shaped pressing block 5 of the pressing fixture forms a concave-convex fit with the outer wall of the inner skin 1, which can easily achieve positioning and installation, enabling rapid positioning of honeycomb parts, saving product manufacturing time, and improving the assembly accuracy of parts. The product has a handle for easy handling by workers. The pressing fixture is preferably made of aluminum, which can heat and cool the thermosetting adhesive after hot melting, improving the assembly efficiency of parts.

[0038] Preferably, the heating process of the hot melt adhesive tape in step S4 is as follows: hot air is blown onto the hot melt adhesive tape by a blower device with a built-in heating component, thereby melting the hot melt adhesive tape. In this embodiment, the heating process of the hot melt adhesive tape in step S4 is completed by a high-power electric hot air blower.

[0039] In this document, the directional terms such as front, back, top, and bottom are defined based on the location of the components in the accompanying drawings and their relative positions to each other, solely for the purpose of clarity and convenience in expressing the technical solution. It should be understood that the use of these directional terms should not limit the scope of protection claimed in this application.

[0040] Where there is no conflict, the above embodiments and features described herein can be combined with each other.

[0041] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for positioning and installing honeycomb parts used in the manufacture of aircraft sound-absorbing pads, characterized in that: The method includes the following steps: S1: Make a semi-cylindrical inner skin and install the semi-cylindrical inner skin on the positioning block of the semi-cylindrical structure; install positioning rings on the surface of the inner skin, and fix the two ends of the positioning rings to the positioning block in a detachable manner to press and fix the inner skin. In step S1, the inner skin is also provided with flat connecting edges on both sides. The connecting edges are attached to the surface of the inner skin and are located in the connecting seam. S2: Lay the honeycomb panel at the designated position on the outer surface of the inner skin. The honeycomb panel is attached to the outer surface of the inner skin. Align the side of the honeycomb panel with the positioning ring so that the positioning ring and the edge of the honeycomb panel form a connection seam of a fixed width; S3: Add hot melt adhesive into the joint, and use the hot melt adhesive to bond the outer surface of the inner skin and the edge of the honeycomb panel inside the joint; The hot melt adhesive is a hot melt adhesive tape. The width of the hot melt adhesive tape is equal to the width of the joint. The hot melt adhesive tape is pasted inside the joint. Part of the hot melt adhesive tape is pasted on the outer surface of the inner skin of the joint, and the rest is pasted on the joint edge of the honeycomb panel. S4: Heat the hot melt adhesive to melt it, and press the hot melt adhesive with a pressing jig to make the melted hot melt adhesive compact and accelerate its cooling and solidification. The cooled and solidified hot melt adhesive will bond the honeycomb panel to the surface of the semi-cylindrical inner skin, completing the fixation of one side of the honeycomb panel. S5: Install the positioning ring on the other side of the honeycomb panel to complete the adhesive bonding of the other side of the honeycomb panel.

2. The method for positioning and installing honeycomb parts for manufacturing aircraft sound-absorbing pads according to claim 1, characterized in that: The method also includes step S6: S6: The two semi-cylindrical outer skins that have been glued together to form a complete cylindrical inner skin structure, and an outer skin structure is installed on the outer surface of the cylindrical inner skin structure to form a complete sound-absorbing pad.

3. The method for positioning and installing honeycomb parts for manufacturing aircraft sound-absorbing pads according to claim 1, characterized in that: The width of the connecting seam is 20-40mm, which is twice the width of the connecting edge of the honeycomb panel.

4. The method for positioning and installing honeycomb parts for manufacturing aircraft sound-absorbing pads according to claim 1, characterized in that: The above steps S3 and S4 are repeated multiple times, so that multiple hot melt adhesives are cured in the joint, thereby completing the fixation of one side of the honeycomb panel.

5. The method for positioning and installing honeycomb parts for manufacturing aircraft sound-absorbing pads according to claim 1, characterized in that: The process of heating the hot melt adhesive tape in step S4 is as follows: hot air is blown onto the hot melt adhesive tape by a blower device with a built-in heating component, thereby melting the hot melt adhesive tape.

6. A method for positioning and installing honeycomb parts for manufacturing aircraft sound-absorbing pads, as described in claim 1. Its features are: The pressing fixture in step S4 includes an arc-shaped pressing block and a connecting handle. The bottom of the arc-shaped pressing block is arc-shaped and is pressed against the surface of the inner skin inside the connecting seam. The width of the arc-shaped pressing block is equal to the width of the connecting seam.

7. A method for positioning and installing honeycomb parts for manufacturing aircraft sound-absorbing pads, as described in claim 6. Its features are: The connecting handle includes a mounting plate, a connecting plate, and a handle. The mounting plate is connected to the arc-shaped pressure block by screws or welding, and the connecting plate connects the mounting plate and the handle.

8. A method for positioning and installing honeycomb parts for manufacturing aircraft sound-absorbing pads according to claim 6, characterized in that: Both the curved pressure block and the connecting handle are made of aluminum.

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