A method for bonding parts

Abstract

This invention provides a method for bonding parts, which can effectively reduce or even avoid defects such as pores and voids. The method includes the following steps: S1, dividing the area of ​​the bonding surface of the two parts by the area of ​​the surface of the part containing the bonding surface, with the larger result belonging to part A and the smaller result to part B; S2, applying adhesive to the bonding surfaces of parts A and B respectively and smoothing it out, then further shaping the adhesive layer on part A into a serrated shape with spaced toothed grooves, the toothed grooves extending along the width of the bonding surface and penetrating both sides of the adhesive layer; S3, placing the bonding surfaces of parts A and B face each other and applying pressure to connect parts A and B.

Description

Technical Field

[0001] This invention relates to the field of aircraft airframe processing technology, specifically a method for bonding parts. Background Technology

[0002] During the manufacturing process of aircraft fuselages, some parts need to be joined by adhesive bonding. The quality of this bonding plays a crucial role in the overall structural strength of the aircraft. When bonding the fuselage structure of low-altitude aircraft, a common method is to use a flat scraper to evenly apply a certain thickness of adhesive to the bonding area of ​​the two parts. This method often results in low adhesive utilization, significant adhesive wastage, and inconsistent bonding quality, easily leading to porosity defects.

[0003] To improve the bonding quality, some existing technologies use a serrated scraper to apply the adhesive, creating a serrated adhesive layer. For example, patent application CN111762336A discloses a method of using adhesive to mold and bond the outer flap rib, middle flap rib, and inner flap rib together with the upper flap skin and lower flap skin fixed on a bonding fixture. The adhesive is applied in a serrated pattern to the bonding surfaces of the upper flap skin, lower flap skin, outer flap rib, middle flap rib, and inner flap rib using a scraper. In this method, both bonding surfaces are serrated. When pressed together, the serrations combine to form a grid pattern, dividing the adhesive layer into individual units. The ventilation channels in these individual areas become blocked, preventing complete gas expulsion. As a result, the cured adhesive layer is discontinuous and prone to blocky or strip-like defects. Summary of the Invention

[0004] To address the above problems, this invention provides a method for bonding parts, which can effectively reduce or even avoid defects such as pores and voids.

[0005] The technical solution is as follows: a method for bonding parts, which is used for two parts that need to be bonded to each other, characterized by the following steps: S1, dividing the area of ​​the bonding surface of the two parts by the area of ​​the surface of the part where the bonding surface is located, the larger result is part A, and the smaller result is part B.

[0006] S2. Apply adhesive to the bonding surfaces of parts A and B respectively and make them flat. Then, perform a secondary molding of the adhesive layer applied to part A to make it serrated and generate spaced toothed grooves. The toothed grooves extend along the width direction of the bonding surface and penetrate both sides of the adhesive layer.

[0007] S3. Place the adhesive surfaces of parts A and B face each other and apply pressure to the two parts to connect parts A and B.

[0008] Furthermore, when the width of the adhesive bonding surface of two parts and the width of the part surface on which the adhesive bonding surface is located are equal along the length direction, parts A and B are determined by dividing the width of the adhesive bonding surface by the width of the part surface on which the adhesive bonding surface is located. The part with the larger result is part A, and the part with the smaller result is part B.

[0009] Furthermore, in step S2, the adhesive layer is formed a second time by a scraper, the scraper having a serrated edge, and the adhesive layer of part A is formed a second time by the serrated edge.

[0010] Furthermore, the scraper also includes a smooth edge, which smooths the adhesive layer.

[0011] Beneficial effects: (1) Differentiating between parts A and B can reduce the actual amount of glue used and shorten the length of the toothed groove, which helps the gas to be discharged when the two parts are pressed together.

[0012] (2) The toothed grooves face the width of the adhesive surface. The adhesive layer on the part has the characteristics of a large number of grooves and shorter groove length. When the adhesive is pressed, the gas can be quickly discharged from the grooves.

[0013] (3) The toothed grooves are continuous and run through both sides of the part. When the adhesive is pressed, the gas can be quickly discharged from the grooves. Attached Figure Description

[0014] Figure 1 This is a structural diagram of parts A and B after the bonding is completed;

[0015] Figure 2 This is a schematic diagram of the scraper structure;

[0016] Figure 3 A schematic diagram of part A with a serrated adhesive layer;

[0017] Figure 4 This is a schematic diagram of part B, which has a smooth adhesive layer. Detailed Implementation

[0018] A method for bonding parts, which is used for such Figure 1 The two parts shown need to be glued together, including the following steps: S1, divide the area of ​​the bonding surface of the two parts by the area of ​​the surface on which the bonding surface is located. The larger result is part A, and the smaller result is part B. When the width of the bonding surface of the two parts and the width of the surface on which the bonding surface is located are equal along the length direction, for example, in the shape of a rectangle or a ring, it is preferable to determine parts A and B by dividing the width of the bonding surface by the width of the surface on which the bonding surface is located.

[0019] S2. Apply adhesive to the bonding surfaces of parts A and B respectively. The adhesive layer applied to part A is shaped using the serrated edge of scraper 1, resulting in a shape resembling... Figure 3The serrated adhesive layer a shown creates spaced toothed grooves that extend along the width of the adhesive surface and penetrate both sides of the adhesive layer. This results in a large number of short toothed grooves that allow for rapid air release during pressure. Part B is processed as follows: Figure 2 The smooth edge of the scraper 1 shown ensures a flat and complete application, and the adhesive layer thickness is applied according to the minimum effective thickness of the adhesive, resulting in a smooth adhesive layer. Figure 4 As shown in part b of the document.

[0020] S3. Place the adhesive surfaces of parts A and B face each other and apply pressure to the two parts to connect parts A and B.

[0021] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A method for bonding parts, used for two parts that need to be bonded together, characterized in that, Includes the following steps: S1. Divide the area of ​​the bonding surface of the two parts in this instance by the area of ​​the surface of the part in which the bonding surface is located. The part with the larger result is A, and the part with the smaller result is B. S2. Apply adhesive to the bonding surfaces of parts A and B respectively and make them flat. Then, perform a secondary molding of the adhesive layer applied to part A to make it serrated and generate spaced toothed grooves. The toothed grooves extend along the width direction of the bonding surface and penetrate both sides of the adhesive layer. S3. Place the adhesive surfaces of parts A and B face each other and apply pressure to the two parts to connect parts A and B.

2. The method for bonding parts according to claim 1, characterized in that: When the width of the adhesive bonding surface and the width of the part surface on which the adhesive bonding surface is located are equal along the length direction, parts A and B are determined by dividing the width of the adhesive bonding surface by the width of the part surface on which the adhesive bonding surface is located. The part with the larger result is part A, and the part with the smaller result is part B.

3. A method for bonding parts according to claim 1 or 2, characterized in that: In step S2, the adhesive layer is formed a second time by a scraper, the scraper having a serrated edge, and the adhesive layer of part A is formed a second time by the serrated edge.

4. The method for bonding parts according to claim 3, characterized in that: The scraper also includes a smooth edge, which is used to smooth the adhesive layer.

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