Flat-mouth glue nozzle and plane deep-slit and narrow-slit upward-posture gluing method

Abstract

The invention relates to the technical field of aircraft manufacturing and maintenance, in particular to a flat mouth glue nozzle and an aircraft deep seam and narrow seam upward posture gluing method.The method comprises the steps that S1, a stainless steel flat mouth glue nozzle matched with a deep seam and a narrow seam in size is designed, and the end of the glue nozzle is cut into an oblique angle; s2, an adhesive tape is bonded to the edges of the two sides of the deep seam and the narrow seam to be glued, the adhesive tape completely covers the seam area, and a barrier for preventing glue from dripping is formed; s3, openings are formed in the adhesive tape in the gap direction, the opening width is suitable for the width of an adhesive nozzle, and the interval length of every two adjacent openings is determined according to the length requirement of each time of adhesive injection; s4, enabling a stainless steel flat mouth glue nozzle to go deep into the opening of the adhesive tape until the oblique angle end part of the glue nozzle is in contact with the bottom or the side wall of the gap, and injecting glue; and S5, during glue injection, the sealant should overflow from the top of the gap to ensure that the opposite gap is filled, and then glue injection is conducted on the next opening.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of aircraft manufacturing and maintenance, in particular to a flat-mouth glue nozzle and an aircraft deep-seam narrow-seam upward-position glue coating method, which is particularly suitable for the glue coating of aircraft skin seams with a width of less than or equal to 1.5 mm and a depth of greater than or equal to 20 mm. BACKGROUND

[0002] In the process of aircraft manufacturing and maintenance, the deep-seam and narrow-seam parts of the fuselage structure (such as the wing and fuselage connection seam, skin joint seam, etc.) often need to be sealed and coated with glue to ensure the aerodynamic performance, waterproofness, structural integrity and stealth performance of the aircraft. However, when glue coating is performed in an upward position, the glue body is prone to dripping due to the action of gravity, which can cause uneven glue coating, difficulty in quantity control, and even pollution of the surrounding structure, affecting the assembly quality and efficiency of the aircraft. The traditional glue coating method cannot meet the precision and quality requirements of deep-seam and narrow-seam upward-position glue coating, and a new glue coating method is urgently needed to solve the above problems. SUMMARY

[0003] The purpose of the present application is: The present application aims to provide a deep-seam narrow-seam upward-position glue coating method and a flat-mouth glue nozzle, which effectively solve the problem of glue dripping due to gravity during upward-position glue coating, achieve uniform and precise glue coating, and improve the glue coating quality and efficiency of deep-seam and narrow-seam parts of the aircraft.

[0004] The technical solution of the present application is: A deep-seam narrow-seam upward-position glue coating method, the method comprising: S1, designing a stainless steel flat-mouth glue nozzle that is suitable for the size of the deep-seam and narrow-seam, and cutting the end of the glue nozzle into an oblique angle; S2, adhering adhesive tape on both sides of the edges of the deep-seam and narrow-seam to be coated with glue, and the adhesive tape completely covers the gap area to form a barrier to prevent glue dripping; S3, opening a gap in the adhesive tape along the direction of the gap, and the opening width is suitable for the width of the glue nozzle, and the interval length between adjacent openings is determined according to the length requirement of each glue injection; S4, inserting the stainless steel flat-mouth glue nozzle into the opening of the adhesive tape until the oblique angle end of the glue nozzle contacts the bottom or side wall of the gap for glue injection; S5, during glue injection, the sealant should overflow from the top of the gap to ensure that the seam is filled, and then glue injection is performed at the next opening.

[0005] Further, In S1, the angle of the oblique angle at the end of the glue nozzle is 30-60°, and the flat-mouth width is suitable for the width of the seam.

[0006] Further, In S1, one side of the end of the glue nozzle is cut into an oblique angle, or both sides of the end of the glue nozzle are cut into oblique angles.

[0007] Further, In S3, the adjacent opening interval length is calculated according to the following formula:

[0008] When the skin is fixed, U=0, h is the gap depth, b is the gap width, l is the adjacent opening interval length, μ is the viscosity, V is the average flow rate, is the glue pressure of the glue gun, where V=Q / S, Q is the flow rate, and the area S=hb, according to the adjacent opening interval length is calculated.

[0009] Further, In S5, after the glue injection operation at each opening is completed, the excess glue around the joint is scraped to the joint surface using a glue scraping plate within 30 minutes after standing for more than 10 minutes, and the sealant is pressed and compacted using the small end of the glue scraping plate, then the excess glue around the joint is scraped to the joint surface again using the glue scraping plate, and the sealant is trimmed flat using the wide end of the glue scraping plate.

[0010] A raised layer is arranged on the surface of the two sides of the deep and narrow joint, and the adhesive tape is connected across the two sides of the raised layer, so that the adhesive tape and the two sides of the deep and narrow joint increase the volatile space b of the sealant, and the thickness of the raised layer can adjust the height of the volatile space.

[0011] The present application also provides a flat nozzle, and the end of the nozzle is beveled.

[0012] The angle of the bevel at the end of the nozzle is 30-60°, and the width of the flat nozzle is suitable for the width of the joint.

[0013] One side of the end of the nozzle is beveled, or both sides of the end of the nozzle are beveled.

[0014] The beneficial effects of the present application are: 1. The flat nozzle + bevel design improves the flow direction and filling effect of the glue, and better adapts to the deep and narrow joint structure, improving the accessibility and uniformity of the glue application.

[0015] 2. The adhesive tape bonding and opening design effectively prevents the dripping phenomenon of the glue due to gravity in the prone position, avoids uneven filling of the glue in the joint and contamination of the surrounding structure, and ensures the cleanliness of the glue application environment.

[0016] 3. Reasonable setting of the opening distance of the adhesive tape ensures continuous filling and uniform distribution of the glue, accurate control of the glue amount, improves the glue application quality and efficiency, and reduces the rework rate in the process of aircraft manufacturing and maintenance. Attached Figure Description

[0017] Figure 1 It is a unidirectional dispensing nozzle shape; Figure 2 This specifies the injection position and direction for the unidirectional glue injection nozzle. Figure 3 It has a two-way dispensing nozzle shape; Figure 4 This refers to the injection position and direction of the two-way injection nozzle; Figure 5 Cross-sectional view of tape for assisting in applying adhesive to the seam; Figure 6 This is a schematic diagram of the raised floor; Figure 7 Flowchart of glue injection operation; Explanation of the numbering in the diagram: 1. Flat-mouth stainless steel nozzle before grinding; 2. Threaded bottom of the nozzle for connection to the glue gun; 3. Grinding of a single-sided glue nozzle (grinding angle 30°-60°); 4. Grinding of a double-sided glue nozzle (grinding angle 30°-60°). Detailed Implementation The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. 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.

[0018] This invention provides a method for applying adhesive to deep and narrow seams of aircraft in an overhead position, such as... Figure 7 As shown, the method includes: 1. Nozzle Preparation: Design stainless steel flat nozzles adapted to the dimensions of deep and narrow seams. Cut the nozzle tip at an angle, preferably 30-60°. This angled design increases the contact area between the nozzle and the seam, while also providing lateral glue dispensing capability, allowing the glue to flow smoothly and be guided into the seam (the same principle applies to bidirectional glue dispensing). The width of the flat nozzle should be adapted to the width of the seam. Figures 1-4 As shown.

[0019] 2. Tape Bonding: Select a tape with good adhesion and flexibility (such as a special tape resistant to high temperatures and aviation fuel) and apply it to both edges of deep and narrow seams where adhesive will be applied. The tape must completely cover the seam area to form a barrier preventing adhesive dripping. Figure 5 As shown.

[0020] 3. Tape opening treatment: Make an opening along the seam direction on the bonded tape. The opening width is slightly larger than the tape diameter. The opening length is determined according to the length required for each glue injection. The opening must ensure that the glue nozzle can be inserted smoothly while ensuring the integrity of the tape.

[0021] 4. Adhesive Injection Procedure: Insert the prepared stainless steel nozzle into the opening of the tape until the beveled end of the nozzle contacts the bottom or sidewall of the gap. During the injection process, keep the nozzle stationary and control the dispensing pressure and injection time of the caulking gun to allow the adhesive to slowly and evenly fill the gap.

[0022] 5. Tape Opening Distance Setting: Based on the gap length and adhesive curing time, the distance between adjacent tape openings should be set appropriately, which can be determined according to Formula 2 (assuming parameters such as injection speed, viscosity, and pressure are known). Typically, the distance between adjacent openings is controlled between 100-300mm. This ensures that during the injection process, before the adhesive in the previous injection area has fully cured, subsequent injections can smoothly connect, forming a continuous and uniform adhesive layer.

[0023]

[0024] According to Formula 1, when the skin is fixed, U=0 h is the gap height (depth), b is the gap width, l is the gap length, μ is the viscosity, and V is the average flow velocity. The dispensing pressure of the glue gun Where V = Q / S, Q is the flow rate, and S = hb Formula 2 can be obtained

[0025] A padding layer is provided on both sides of the edge surface of the deep and narrow slits, such as... Figure 6 As shown, the tape spans across the padding layers on both sides, increasing the evaporation space b of the sealant between the tape and the edges of the deep and narrow seams. The height of the evaporation space can be adjusted by selecting the thickness of the padding layers.

[0026] 6. Complete the sealant application: When applying the sealant, ensure it overflows from the top of the joint to completely fill the gap. After completing the application in one area near the joint, remove the nozzle from the opening. After the application is complete, let it stand for at least 10 minutes (but within 30 minutes of mixing). After the surface tape has disintegrated, use a scraper to scrape off any excess sealant around the joint onto the joint surface, depending on the sealant's shrinkage. Use the narrow end of the scraper to press the sealant firmly. Then, use the scraper again to scrape off any excess sealant around the joint onto the joint surface, and use the wide end of the scraper to smooth the sealant evenly.

[0027] Comparative experimental data

[0028] 1. This application utilizes adhesive tape to seal the underside of structural gaps, thus solving the problem of sealant flow during overhead filling. Injection ports can also be created on the tape at intervals between adjacent openings, making the tape a single, integrated structure along the length of the structural gap. This facilitates rapid, one-time sealing of the gap. The evenly spaced injection ports also ensure consistent injection pressure during nozzle application, preventing excessive pressure from causing the sealing paper to detach.

[0029] 2. The nozzle is designed to fit and adapt to the width of the structural gaps, allowing the sealant to fully fill the gaps and solving the problem of incomplete filling and air bubbles. One side wall of the nozzle is beveled. During sealant application, this bevel allows the sealant flowing from the nozzle to flow towards the area where sealant has already been applied, actively combining with previously applied sealant, improving application quality and preventing sealant delamination.

[0030] 3. By setting up shims, the amount of sealant added can be increased during the sealant filling process to accommodate the different evaporation and shrinkage rates of various sealants, ensuring the flatness of the sealant base after a single sealant filling. Using shim tape offers high flexibility in achieving the desired shim thickness and allows for flexible cutting to fit the length of structural gaps, resulting in high operability. Using plastic strips allows for pre-fabrication of different thicknesses based on the evaporation and shrinkage rates of various sealants, enabling direct selection and use during sealant application, making the process faster. A connecting bridge between the two plastic strips allows for assembly of the strips onto the first and second workpieces without the need for adhesive bonding, eliminating the need for residual sealant cleaning after the sealant has cured.

Claims

1. A method for applying adhesive to deep and narrow seams of an aircraft in an overhead orientation, characterized in that, The method includes: S1 features a stainless steel flat nozzle designed to fit the dimensions of deep and narrow seams, with the nozzle tip cut at an angle. S2, apply the tape to both sides of the deep or narrow seam where the adhesive is to be applied, so that the tape completely covers the seam area and forms a barrier to prevent the adhesive from dripping. S3, make an opening on the tape along the slit direction. The opening width is suitable for the nozzle width. The length of the interval between adjacent openings is determined according to the length requirement of each glue injection. S4. Insert the stainless steel flat nozzle into the opening of the tape until the beveled end of the nozzle contacts the bottom or side wall of the gap to inject adhesive. S5. When applying sealant, the sealant should overflow from the top of the gap to ensure that the gap is completely filled, and then apply sealant to the next opening.

2. The method for applying adhesive to deep and narrow seams of an aircraft in an upward-facing position according to claim 1, characterized in that, In S1: the bevel angle of the nozzle end is 30-60°, and the width of the flat opening is adapted to the width of the seam.

3. The method for applying adhesive to deep and narrow seams of an aircraft in an upward-facing position according to claim 1, characterized in that, In S1: Cut one side of the nozzle end at an angle, or cut both sides of the nozzle end at an angle.

4. The method for applying adhesive to deep and narrow seams of an aircraft in an upward-facing position according to claim 1, characterized in that, In S3, the length of the interval between adjacent openings is calculated according to the following formula: When the skin is fixed, U=0, h is the slit depth, b is the slit width, l is the distance between adjacent openings, μ is the viscosity, and V is the average flow velocity. The dispensing pressure of the glue gun. Where V = Q / S, Q is the flow rate, and S = hb, according to... Calculate the length of the interval between adjacent openings.

5. The method for applying adhesive to deep and narrow seams of an aircraft in an overhead orientation, as described in claim 1, is characterized in that... In S5, after the glue injection operation at each opening is completed, let it stand for more than 10 minutes but less than 30 minutes. After the surface tape is broken down, use a scraper to scrape the excess glue around the joint onto the joint surface according to the shrinkage of the sealant. Use the small end of the scraper to press the sealant firmly. Then use the scraper again to scrape the excess glue around the joint onto the joint surface. Use the wide end of the scraper to smooth the sealant.

6. The method for applying adhesive to deep and narrow seams of an aircraft in an upward-facing position according to claim 1, characterized in that, A padding layer is provided on both sides of the deep and narrow seam edge surfaces. The tape is laid across the padding layer on both sides, so that the tape and the two sides of the deep and narrow seam edge increase the evaporation space b of the sealant. The height of the evaporation space can be adjusted by selecting the thickness of the padding layer.

7. A flat-mouth rubber nozzle, characterized in that, The tip of the flat nozzle is angled.

8. A flat-mouth nozzle according to claim 7, characterized in that, The bevel angle of the nozzle end is 30-60°, and the width of the flat opening is suitable for the width of the seam.

9. A flat-mouth nozzle according to claim 7, characterized in that, The nozzle tip has a bevel on one side, or both sides of the nozzle tip have bevels.

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