Method for rapidly repairing fuel tank broken hole damage through metal adhesive tape

Abstract

The invention relates to the technical field of aircraft fuel tank damage repair, in particular to a method for rapidly repairing fuel tank broken hole damage through a metal adhesive tape. (2) bonding surface treatment; 3) cutting and paving the adhesive tape; 4) manufacturing a metal patch and selecting a fastener; 5) mechanically connecting the metal patch; 6) cutting and paving an additional adhesive tape; and (7) repairing quality inspection. The whole fuel tank structure is mechanically connected through cooperation of the metal adhesive tape and the metal patch, the problem that according to a traditional repairing method, the curing time of a sealant is long is solved, quick repairing of fuel tank broken hole damage is achieved, the sealing performance and the mechanical performance are effectively improved, and the use safety and reliability of an airplane are guaranteed; the method has the advantages of simple operation, rapidness, high efficiency, safety and reliability.

Description

Technical Field

[0001] The invention relates to the technical field of aircraft fuel tank damage repair, in particular to a method for quickly repairing fuel tank hole damage with a metal adhesive tape. Background Art

[0002] The integral fuel tank is an important part of the aircraft structure, which makes full use of the volume of the structural components of the fuselage and wings to increase the fuel storage capacity and reduce the weight of the aircraft. However, during the flight service, due to the impact of high-speed impacts such as shrapnel and bird strikes, the integral fuel tank structure is damaged by holes, resulting in reduced sealing of the structure, oil leakage, oil seepage and other faults, which seriously threaten the safety of aircraft use and service life.

[0003] At present, the repair of holes in aircraft fuel tanks usually adopts the method of mechanical connection between metal patch-blind rivets and sealants and fuel tank structure. This method has high reliability, but because it generally requires 2 to 3 layers of sealants to be applied (the vulcanization / curing time of each layer of sealant is about 24 hours), the fuel tank repair cycle is long, which seriously reduces work efficiency. Therefore, it is urgent to design a fast repair method suitable for aircraft fuel tank holes to solve the problem of long vulcanization / curing time of sealant repair method, shorten the repair cycle, improve the sealing and mechanical properties of the overall fuel tank structure, and ensure the safety and reliability of flight. Summary of the invention

[0004] In order to solve the above technical problems, the present invention proposes a method for quickly repairing fuel tank puncture damage using metal tape, thereby achieving the purpose of improving the sealing and mechanical properties of the fuel tank, effectively shortening the repair cycle, and ensuring the safety and reliability of the aircraft.

[0005] The technical problem to be solved by the present invention is achieved by adopting the following technical solutions:

[0006] A method for quickly repairing oil tank hole damage using a metal tape comprises the following steps:

[0007] 1) Damage assessment and removal:

[0008] Record the damage geometric parameters of the damaged area on the integral fuel tank, determine the size of the damaged area of ​​the integral fuel tank, record the diameter as d, trim the damaged area of ​​the skin, and wipe the repair surface with a fine cloth soaked in acetone until there is no obvious stain or debris on the surface of the fine cloth;

[0009] 2) Bonding surface treatment:

[0010] Use 60#~80# sandpaper to polish the surface of the skin repair area. The polishing area is required to be larger than the metal tape bonding area. Use acetone-soaked fine cloth to wipe the repair surface until there is no obvious stain or debris on the surface of the fine cloth. Use a brush to apply AC-130 surfactant treatment agent on the polished skin surface.

[0011] 3) Cutting and laying of metal tape:

[0012] Use scissors and a ruler to cut the metal tape, use tweezers to pick up the metal tape and lay it layer by layer, use a scraper to press the metal tape from the center to the periphery, remove the air between the metal tapes, and use a soft rubber roller to compact the metal tape multiple times. The surface must be smooth and flat, without pores, wrinkles, or warping.

[0013] 4) Manufacturing of metal patches and selection of fasteners:

[0014] Use a shear or cutting tool to make a metal patch. The thickness and material grade of the metal patch should be consistent with the thickness and material of the entire fuel tank. The diameter of the metal patch is recorded as D. Refer to the "Steel Structure Design Standard" to determine the diameter of the fastener, which is recorded as A;

[0015] 5) Mechanical connection of metal patch:

[0016] Use a marker pen to mark the location of the fasteners on the metal patch, and use a pneumatic tool to connect the metal patch to the damaged area on the integral fuel tank;

[0017] 6) Cutting and laying of additional metal tape:

[0018] Lay two layers of additional metal tape on the outer surface of the metal patch. When the width exceeds the bonding area of ​​the metal tape, the metal tape is allowed to overlap. The laying parameters are the same as step 3);

[0019] 7) Repair quality inspection:

[0020] Check that the cut edge of the metal tape is free of burrs, the metal tape is flat and smooth, and has no pores, wrinkles, or warping.

[0021] As a further improvement of the present invention, in step 1) and step 2), wiping the repaired surface with acetone requires wiping in a unidirectional manner from top to bottom.

[0022] As a further improvement of the present invention, the size requirements of the metal tape in step 3) are as follows: the distance between the metal tape and the damaged edge on the integral fuel tank is 25 mm; the overlap distance of the metal tape is 12.5 mm; and the tolerance range is 1 mm to 2 mm.

[0023] As a further improvement of the present invention, the diameter size of the metal patch in step 4) is: D=d+4e, wherein e=2.5A.

[0024] As a further improvement of the present invention, the spacing between the fasteners in step 5) is denoted as p, where p=4A.

[0025] The beneficial effects of the present invention are:

[0026] The present invention provides a method for quickly repairing a hole in a fuel tank using metal tape. The metal tape is used in conjunction with a metal patch to mechanically connect the entire fuel tank structure, thereby overcoming the problem of a long sealant curing time in traditional repair methods, achieving rapid repair of the hole in the fuel tank, effectively improving the sealing and mechanical properties, and ensuring the safety and reliability of aircraft use. The method has the advantages of being simple to operate, rapid and efficient, safe and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The present invention is further described below in conjunction with the accompanying drawings and embodiments:

[0028] Figure 1 It is a schematic diagram of the overall oil tank hole structure;

[0029] Figure 2 It is a schematic diagram of metal tape bonding;

[0030] Figure 3 is a schematic diagram of fastener distribution;

[0031] Figure 4 Schematic diagram of metal tape repair.

[0032] In the figure: 1. Metal tape; 2. Additional metal tape; 3. Fastener; 4. Metal patch; 5. Integral fuel tank. DETAILED DESCRIPTION

[0033] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below with reference to the accompanying drawings and embodiments.

[0034] A method for quickly repairing a puncture in an oil tank using metal tape comprises: 1) damage assessment and removal; 2) bonding surface treatment; 3) tape cutting and pasting; 4) metal patch manufacturing and fastener selection; 5) metal patch mechanical connection; 6) additional tape cutting and pasting; and 7) repair quality inspection.

[0035] The above steps are as follows:

[0036] 1) Damage assessment and removal.

[0037] Use a ruler or other measuring tool to record the damage geometric parameters of the damaged area on the integral fuel tank 5, determine the size of the damaged area of ​​the integral fuel tank 5, and record the diameter as d. Trim the damaged area of ​​the skin on the integral fuel tank 5, and use acetone-soaked fine cloth to wipe the repair surface from top to bottom in one direction until there is no obvious stain or debris on the surface of the fine cloth.

[0038] 2) Bonding surface treatment.

[0039] Use 60#~80# sandpaper to grind the surface of the skin repair area. The grinding area is required to be larger than the metal tape bonding area. Use acetone-soaked fine cloth to wipe the repair surface from top to bottom in one direction until there is no obvious stain or debris on the surface of the fine cloth. Use a brush to apply AC-130 surfactant treatment agent on the grinded skin surface.

[0040] 3) Cutting and laying of the metal tape 1.

[0041] Use scissors and a ruler to cut the metal tape 1, use tweezers to pick up the metal tape 1 and lay it layer by layer, use a scraper to press the metal tape 1 from the center to the periphery, remove the air between the metal tapes 1, and use a soft rubber roller to compact the metal tape 1 multiple times. The surface is required to be smooth and flat, without pores, wrinkles, and warping.

[0042] The dimensions of the metal tape 1 are determined as follows: the distance between the metal tape 1 and the damaged edge on the integral oil tank 5 is 25 mm; the overlap distance of the metal tape 1 is 12.5 mm; and the tolerance range is 1 mm to 2 mm.

[0043] 4) Manufacturing of metal patch 4 and selection of fastener 3.

[0044] Use a shear or cutting tool to make the metal patch 4. The thickness and material grade of the metal patch 4 are consistent with the thickness and material of the overall oil tank 5. Refer to the "Steel Structure Design Standard" to determine the diameter of the fastener 3, which is recorded as A.

[0045] In the above description, the diameter of the metal patch 4 is recorded as D, specifically, D=d+4e, wherein e=2.5A.

[0046] 5) Mechanical connection of the metal patch 4.

[0047] like Figure 3 As shown, the position of the fasteners 3 is marked on the metal patch 4 with a marker pen, and the spacing between the fasteners 3 is marked as p, where p=4A. The metal patch 4 is connected to the damaged area on the integral oil tank 5 with a pneumatic tool.

[0048] 6) Cutting and laying of the additional metal tape 2.

[0049] according to Figure 3 and Figure 4 Two layers of additional metal tape 2 are laid on the outer surface of the metal patch 4. When the width exceeds the metal tape pasting area, the metal tape is allowed to overlap. The laying parameters are the same as step 3).

[0050] 7) Repair quality inspection.

[0051] Check that the cut edge of the metal tape 1 has no burrs, the metal tape 1 is flat and smooth, has no pores, no wrinkles, and no warping.

[0052] In this embodiment, an aluminum alloy metal oil tank with a puncture damage of 30 mm in diameter, 2 mm in thickness and made of 7B04 material is taken as an example, and a metal tape mechanical connection repair is carried out.

[0053] Step 1: Damage assessment and removal.

[0054] Use a ruler or other measuring tool to determine the size of the damaged area of ​​the integral fuel tank 5, and record the diameter as d, where d is 30 mm. Use acetone-soaked fine cloth to wipe the repair surface from top to bottom in one direction until there is no obvious stain or debris on the surface of the fine cloth.

[0055] Step 2: Bonding surface preparation.

[0056] Use 0#~80# sandpaper to grind the surface of the skin repair area. The diameter of the grinding area is 100mm. Use acetone-soaked fine cloth to wipe the repair surface from top to bottom in one direction until there is no obvious stain or debris on the surface of the fine cloth. Use a brush to apply AC-130 surfactant treatment agent on the polished skin surface.

[0057] Step 3: Cutting and laying of metal tape 1.

[0058] Use scissors and ruler to cut a number of metal tapes 1 with a width of 100mm and a length of 100mm. Use tweezers to pick up and lay metal tapes 1 layer by layer. Use a scraper to press metal tapes 1 from the center to the periphery to remove the air between metal tapes 1. Use a soft rubber roller to compact metal tapes 1 several times. The surface is required to be smooth and flat without pores, wrinkles, or warping. The distance between metal tape 1 and the damaged edge on the integral oil tank 5 is 25mm; the overlap distance of metal tape 1 is 12.5mm.

[0059] Step 4: Manufacturing of metal patch 4 and selection of fastener 3.

[0060] According to the "Steel Structure Design Standard", the diameter of the fastener 3 is determined to be 5 mm, and a metal patch 4 with a thickness of 2 mm and a material grade of 7B04 is manufactured using a cutting knife or a cutting tool. The diameter of the metal patch is calculated to be 80 mm according to D = d + 4e, where e = 2.5A.

[0061] Step 5: Mechanical connection of the metal patch 4.

[0062] like Figure 3 As shown, a marker is used to mark the position of the fastener 3 on the metal patch 4, wherein the fastener spacing is denoted as p, and from p=4A, it can be known that p is 20 mm. A pneumatic tool is used to connect the metal patch 4 to the damaged area on the integral oil tank 5.

[0063] Step 6: Cutting and laying of additional metal tape 2.

[0064] Two layers of additional metal tape 2 are laid on the outer surface of the metal patch 4. When the width exceeds the bonding area of ​​the metal tape 1, the metal tapes are allowed to overlap. The laying parameters are the same as those in step 3).

[0065] Step 7: Repair quality inspection.

[0066] Check that the cut edge of the metal tape 1 is free of burrs, the metal tape 1 is flat and smooth, and has no pores, wrinkles, or warps.

[0067] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions only describe the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A method for quickly repairing oil tank puncture damage using metal tape, characterized in that: The following steps are involved: 1) Damage assessment and removal: Record the damage geometric parameters of the damaged area on the integral fuel tank (5), determine the size of the damaged area of ​​the integral fuel tank (5), record the diameter as d, trim the damaged area of ​​the skin, and wipe the repaired surface with a fine cloth soaked in acetone until there is no obvious stain or debris on the surface of the fine cloth; 2) Bonding surface treatment: Use 60#~80# sandpaper to polish the surface of the skin repair area. The polishing area is required to be larger than the metal tape bonding area. Use acetone-soaked fine cloth to wipe the repair surface until there is no obvious stain or debris on the surface of the fine cloth. Use a brush to apply AC-130 surfactant treatment agent on the polished skin surface. 3) Cutting and laying of metal tape (1): Use scissors and a ruler to cut the metal tape (1), use tweezers to pick up the metal tape (1) and lay it layer by layer, use a scraper to press the metal tape (1) from the center to the periphery, remove the air between the metal tapes (1), and use a soft rubber roller to compact the metal tape (1) multiple times, requiring the surface to be smooth and flat without pores, wrinkles, or warping; 4) Manufacturing of metal patch (4) and selection of fastener (3): A metal patch (4) is manufactured using a cutting knife or a cutting tool. The thickness and material grade of the metal patch (4) are consistent with the thickness and material of the overall fuel tank (5). The diameter of the metal patch (4) is denoted as D. The diameter of the fastener (3) is determined by referring to the "Steel Structure Design Standard" and is denoted as A. 5) Mechanical connection of metal patch (4): Using a marking pen to mark the position of the fastener (3) on the metal patch (4), and using a pneumatic tool to connect the metal patch (4) to the damaged area on the integral oil tank (5); 6) Cutting and laying of additional metal tape (2): Laying two layers of additional metal tape (2) on the outer surface of the metal patch (4), when the width exceeds the pasting area of ​​the metal tape (1), the metal tape is allowed to overlap, and the laying parameters are the same as step 3); 7) Repair quality inspection: Check that the cut edge of the metal tape (1) is free of burrs, and the metal tape (1) is flat and smooth, free of pores, wrinkles, and warping.

2. The method for quickly repairing oil tank puncture damage using a metal tape according to claim 1, characterized in that: In step 1) and step 2), the acetone wiping repair surface requires wiping from top to bottom in one direction.

3. The method for quickly repairing oil tank puncture damage with a metal tape according to claim 1, characterized in that: The size requirements of the metal tape (1) in step 3) are as follows: the distance between the metal tape (1) and the damaged edge on the integral oil tank (5) is 25 mm; the overlap distance of the metal tape (1) is 12.5 mm; and the tolerance range is 1 mm to 2 mm.

4. The method for quickly repairing oil tank puncture damage with a metal tape according to claim 1, characterized in that: The diameter of the metal patch (4) in step 4) is: D = d + 4e, where e = 2.5A.

5. The method for quickly repairing oil tank puncture damage with a metal tape according to claim 1, characterized in that: In step 5), the distance between the fasteners (3) is denoted as p, where p=4A.

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