A method of repairing a baffle door

Abstract

This invention relates to the field of aircraft component repair technology and discloses a method for repairing a baffle door, comprising the following steps: Step 1: Identifying the damaged part; Step 2: Cleaning the baffle door; Step 3: Fabricating a hinge reinforcement; Step 4: Removing the paint layer from the damaged part; Step 5: Removing the damaged part; Step 6: Fixing the baffle door onto an assembly fixture; Step 7: Applying a sodium hydroxide solution to the repair area to form an etching solution; Step 8: Applying a chemical conversion coating to the repair area and the hinge reinforcement; Step 9: Assembling the hinge reinforcement to the repair area; Step 10: Drilling a connecting hole at the drilling location using a drilling machine; Step 11: Fixing the hinge reinforcement onto the baffle door. The baffle door repair method provided by this invention can repair baffle doors so that they can continue to be used, reducing waste.

Description

Technical Field

[0001] This invention relates to the field of aircraft component repair technology, and in particular to a method for repairing a baffle door. Background Technology

[0002] During aircraft operation, the high vibration frequency of the baffle door causes the bearings to bear significant tension, which can easily damage the bearing holes that mate with the bearings on the baffle door. When the diameter of the damaged bearing hole is less than 18.775mm, it can be repaired by reaming, slotting, or installing a larger bearing. However, when the diameter of the damaged bearing hole is greater than 18.775mm, there is no specific repair plan in the component repair manual (CMM manual), which means that the baffle door has to be scrapped, resulting in waste. Summary of the Invention

[0003] Aimed at at least in solving one of the technical problems existing in the prior art, the present invention provides a method for repairing baffle doors, which can repair baffle doors with bearing hole diameters greater than 18.775mm so that the baffle doors can continue to be used and reduce waste.

[0004] To achieve the above objectives, the present invention provides a method for repairing a baffle door, comprising the following steps:

[0005] Step 1: The baffle door includes a door body and a bearing lug connected to the door body. The bearing lug has a bearing hole. Check the bearing hole of the bearing lug. If the diameter of the bearing hole is greater than 18.775mm, it is determined that the bearing lug has a damaged part and it should be repaired according to Step 2.

[0006] Step 2: Clean the baffle door with acetone and dry the damaged parts of the bearing lug for more than 15 minutes;

[0007] Step 3: Fabricate a hinge reinforcement according to the repair requirements of the bearing lug. The hinge reinforcement includes a lug and a connecting part fixedly connected to the lug. The lug is provided with a bearing assembly hole for replacing the bearing hole. The diameter of the bearing assembly hole is between 16.662 mm and 18.001 mm.

[0008] Step 4: Remove the paint layer from the damaged portion of the bearing lug;

[0009] Step 5: Using the lug as a repair template, the damaged part of the bearing lug is removed by cutting to form a repair area on the bearing lug. The gap between the lug 21 and the cut of the repair area does not exceed 0.762mm. The repair area is cleaned with acetone.

[0010] Step 6: Secure the baffle door to the assembly fixture, and clean the hinge reinforcement and the repair area with acetone;

[0011] Step 7: Use protective tape to create a perimeter around the repair area. Apply sodium hydroxide solution to the repair area by wiping to form an etching solution. Rinse the repair area with clean water. Dry the baffle door with a drying device. Clean the repair area with acetone. After cleaning, ensure that there is no liquid residue in the repair area.

[0012] Step 8: Apply a chemical conversion coating to the repair area and the hinge reinforcement;

[0013] Step 9: Assemble the hinge reinforcement into the repair area and fix the hinge reinforcement using the assembly fixture;

[0014] Step 10: Arrange multiple drilling positions on the connecting part, drill connecting holes through the connecting part and the baffle door at the drilling positions using drilling equipment, remove the hinge reinforcement from the assembly fixture and remove the hinge reinforcement from the repair area, remove debris from the baffle door and the hinge reinforcement, and clean the repair area and the hinge reinforcement with acetone;

[0015] Step 11: Assemble the hinge reinforcement into the repair area and insert fasteners into the connection holes to fix the hinge reinforcement onto the baffle door.

[0016] In some embodiments, the connecting portion includes a first connecting portion and a second connecting portion, the first connecting portion being connected to the lower end of the lug and located on one side of the lug, and the second connecting portion being connected to the lower end of the lug and located on the side of the lug opposite to the first connecting portion; the connecting hole includes a first connecting hole and a second connecting hole; the first connecting hole passes through the first connecting portion and the door body, and the second connecting hole passes through the second connecting portion and the door body.

[0017] In some embodiments, the baffle door further includes a first reinforcing rib and a second reinforcing rib, the first reinforcing rib connecting the door body and the bearing lug respectively, and the second reinforcing rib connecting the door body and the bearing lug respectively; the connecting portion further includes a third connecting portion and a fourth connecting portion, the third connecting portion connecting to the upper end of the first connecting portion and connecting to the lug portion, and the fourth connecting portion connecting to the upper end of the second connecting portion and connecting to the lug portion; the connecting hole further includes a third connecting hole and a fourth connecting hole, the third connecting hole penetrating the third connecting portion and the first reinforcing rib, and the fourth connecting hole penetrating the fourth connecting portion and the second reinforcing rib.

[0018] In some embodiments, the diameter of the bearing mounting hole is between 17.988 mm and 18.001 mm.

[0019] In some embodiments, in step seven, the sodium hydroxide solution is made from the following parts by weight of raw materials: 20 parts sodium hydroxide and 60-100 parts deionized water.

[0020] In some embodiments, in step seven, the drying equipment is a hot air drying equipment.

[0021] In some embodiments, the diameter of the connecting hole is between 4.0640 mm and 4.2672 mm.

[0022] In some implementations, step eleven includes the following specific steps:

[0023] S1. Prepare adhesive and apply the adhesive evenly to the mating surface of the hinge reinforcement to form an adhesive layer on the mating surface of the hinge reinforcement. The thickness of the adhesive layer shall not exceed 0.762 mm.

[0024] S2, assemble the hinge reinforcement onto the repair area;

[0025] S3, using the adhesive, the fastener is inserted into the connection hole through a wet installation process to fix the hinge reinforcement onto the baffle door.

[0026] The method for repairing a baffle door provided in this embodiment of the invention has the following advantages compared with the prior art:

[0027] (1) When the diameter of the bearing hole of the baffle door is greater than 18.75mm, the damaged part containing the bearing hole in the bearing lug can be cut off, and the hinge reinforcement can be fixedly installed on the baffle. The damaged part can be replaced by the lug of the hinge reinforcement and the bearing hole can be replaced by the bearing assembly hole. This can repair the local damage of the baffle door without destroying the overall layout and installation dimensions of the baffle door, and without affecting the assembly and use of the baffle door. Therefore, the baffle door repair method provided by the present invention can repair baffle doors with a bearing hole diameter greater than 18.775mm so that the baffle door can continue to be used and reduce waste.

[0028] (2) The cost of replacing the new baffle door is about 200,000 yuan, while the cost of repairing the baffle door using the baffle door repair method provided by the present invention can be controlled within 20,000 yuan, saving the airline's costs.

[0029] (3) The hinge reinforcement is fixedly installed on the baffle door by drilling connection holes in the hinge reinforcement and the baffle door and inserting fasteners through the connection holes. The connection between the hinge reinforcement and the baffle door is stable and has high connection strength. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the structure of the baffle door to be repaired provided in an embodiment of the present invention;

[0031] Figure 2 This is a schematic diagram of the hinge reinforcement provided in an embodiment of the present invention;

[0032] Figure 3 This is a schematic diagram of the hinge reinforcement provided in this embodiment of the invention when assembled on a baffle door.

[0033] In the diagram, 1 is the baffle door; 11 is the door body; 12 is the bearing lug; 13 is the first reinforcing rib; 14 is the second reinforcing rib; 121 is the damaged part; and 1211 is the bearing hole.

[0034] 2. Hinge reinforcement; 21. Pole lug; 22. First connecting part; 23. Second connecting part; 24. Third connecting part; 25. Fourth connecting part; 211. Bearing assembly hole; 221. First connecting hole; 231. Second connecting hole; 242. Third connecting hole; 251. Fourth connecting hole. Detailed Implementation

[0035] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0036] In the description of this invention, it should be understood that the terms "center", "longitudinal", "width", "thickness", "upper", "lower", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing this invention and simplifying the description, 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.

[0037] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

[0038] like Figure 1-3 As shown, a preferred embodiment of the present invention for repairing a baffle door includes the following steps:

[0039] Step 1: The baffle door 1 includes a door body 11 and a bearing lug 12 connected to the door body 11. The bearing lug 12 has a bearing hole 1211. Check the bearing hole 1211 of the bearing lug 12. If the diameter of the bearing hole 1211 is greater than 18.775mm, it is determined that the bearing lug 12 has a damaged part 121 and it is repaired according to Step 2.

[0040] Step 2: Clean the baffle door 1 with acetone and dry the damaged part 121 of the bearing lug 12 for more than 15 minutes.

[0041] Step 3: Fabricate hinge reinforcement 2 according to the repair requirements of bearing lug 12. Hinge reinforcement 2 includes lug 21 and a connecting part fixedly connected to lug 21. Lug 21 is provided with bearing assembly hole 211 for replacing bearing hole 1211. The diameter of bearing assembly hole 211 is between 16.662mm and 18.001mm.

[0042] Step 4: Remove the paint layer from the damaged portion 121 of the bearing lug 12;

[0043] Step 5: Using the lug 21 as a repair template, the damaged part 121 of the bearing lug 12 is removed by cutting to form a repair area on the bearing lug 12. The gap between the lug 21 and the cut of the repair area shall not exceed 0.762mm. The repair area is cleaned with acetone.

[0044] Step 6: Securely install the baffle door 1 onto the assembly fixture, and clean the hinge reinforcement and repair area with acetone;

[0045] Step 7: Use protective tape to create a perimeter around the repair area. Apply sodium hydroxide solution to the repair area by wiping to form an etching solution. Rinse the repair area with clean water. Dry the baffle door 1 with a drying device. Clean the repair area with acetone. After cleaning, ensure that there is no liquid residue in the repair area.

[0046] Step 8: Apply a chemical conversion coating to the repair area and hinge reinforcement 2;

[0047] Step 9: Assemble hinge reinforcement 2 into the repair area and secure hinge reinforcement 2 using the assembly fixture;

[0048] Step 10: Arrange multiple drilling positions on the connecting part, drill connecting holes through the connecting part and the baffle door 1 at the drilling positions using drilling equipment, remove the hinge reinforcement 2 from the assembly fixture and remove the hinge reinforcement 2 from the repair area, remove debris from the baffle door 1 and the hinge reinforcement 2, and clean the repair area and the hinge reinforcement 2 with acetone.

[0049] Step 11: Assemble the hinge reinforcement 2 into the repair area and insert the fasteners into the connection holes to fix the hinge reinforcement 2 onto the baffle door 1.

[0050] Based on this technical solution, when the bearing hole diameter of the baffle door is greater than 18.75mm, the damaged portion containing the bearing hole in the bearing lug can be removed, and the hinge reinforcement can be fixedly installed on the baffle. The damaged portion can be replaced through the lug of the hinge reinforcement, and the bearing hole can be replaced through the bearing mounting hole. This allows for the repair of the partially damaged baffle door without disrupting its overall layout and installation dimensions, and has no impact on its assembly and use. Therefore, the baffle door repair method provided by this invention can repair baffle doors with bearing hole diameters greater than 18.775mm, allowing the baffle door to continue to be used and reducing waste. Replacing a new baffle door costs approximately 200,000 yuan, while repairing a baffle door using the method provided by this invention can control the cost to within 20,000 yuan, saving costs for airlines. The hinge reinforcement is fixed to the baffle door by drilling connection holes in the hinge reinforcement and the baffle door and inserting fasteners through the connection holes. The connection between the hinge reinforcement and the baffle door is stable and has high strength. At the same time, the thickness of the baffle door can be increased through the connection part to enhance the strength of the baffle door.

[0051] The method for repairing a baffle door provided in this embodiment of the invention further includes step 12: after the repair is completed, submit for inspection.

[0052] In step seven, the sodium hydroxide solution is made from the following parts by weight of raw materials: 20 parts sodium hydroxide and 60-100 parts deionized water.

[0053] Preferably, the sodium hydroxide solution is prepared from 20 parts sodium hydroxide and 80 parts deionized water.

[0054] In step seven, the drying equipment is a hot air drying equipment.

[0055] The diameter of the connecting hole is between 4.0640 mm and 4.2672 mm.

[0056] Step eleven includes the following specific steps:

[0057] S1. Prepare adhesive and apply it evenly to the mating surface of the hinge reinforcement 2 to form an adhesive layer on the mating surface of the hinge reinforcement 2. The thickness of the adhesive layer shall not exceed 0.762 mm.

[0058] S2, assemble hinge reinforcement 2 onto the repair area;

[0059] S3, using adhesive, fasteners are inserted into the connection holes through a wet installation process to fix the hinge reinforcement 2 onto the baffle door 1.

[0060] In this embodiment, the fastener is a rivet.

[0061] The hinge reinforcement connecting portion provided in this embodiment of the invention includes a first connecting portion 22 and a second connecting portion 23. The first connecting portion 22 is connected to the lower end of the lug portion 21 and located on one side of the lug portion 21, while the second connecting portion 23 is connected to the lower end of the lug portion 21 and located on the side of the lug portion 21 opposite to the first connecting portion 22. The connecting holes include a first connecting hole 221 and a second connecting hole 231. The first connecting hole 221 penetrates through the first connecting portion 22 and the door body 11, and the second connecting hole 231 penetrates through the second connecting portion 23 and the door body 11. By providing the first connecting portion 22 and the second connecting portion 23 on both sides of the lug portion 21, better connection stability and higher connection strength can be achieved between the hinge reinforcement 2 and the baffle door 1. At the same time, the strength of the door body 11 in its thickness direction can also be increased through the first connecting portion 22 and the second connecting portion 23.

[0062] The baffle door 1 also includes a first reinforcing rib 13 and a second reinforcing rib 14. The first reinforcing rib 13 is connected to the door body 11 and the bearing lug 12, respectively. The second reinforcing rib 14 is connected to the door body 11 and the bearing lug 12, respectively. The connecting part also includes a third connecting part 24 and a fourth connecting part 25. The third connecting part 24 is connected to the upper end of the first connecting part 22 and is connected to the lug 21. The fourth connecting part 25 is connected to the upper end of the second connecting part 23 and is connected to the lug 21. The connecting hole also includes a third connecting hole 241 and a fourth connecting hole 251. The third connecting hole 241 passes through the third connecting part 24 and the first reinforcing rib 13. The fourth connecting hole 251 passes through the fourth connecting part 25 and the second reinforcing rib 14. The use of the third connecting part 24 and the fourth connecting part 25 can make full use of the original first reinforcing rib 13 and the second reinforcing rib 14 on the baffle door 1, so that there is a larger connectable area between the hinge reinforcement 2 and the baffle door 1, improving the connection stability and connection strength between the hinge reinforcement 2 and the baffle door 1. At the same time, the strength of the first reinforcing rib 13 and the second reinforcing rib 14 can be strengthened by the third connecting part 24 and the fourth connecting part 25 respectively.

[0063] In this embodiment, the first connecting part 22 is an L-shaped plate structure, the second connecting part 23 is a plate structure, the third connecting part 24 is a plate structure, and the fourth connecting part 25 is a plate structure.

[0064] Preferably, the diameter of the bearing mounting hole 211 is between 17.988 mm and 18.001 mm. Limiting the diameter of the bearing mounting hole 211 to between 16.662 mm and 18.001 mm is within the range of the normal operating diameter requirements for bearing holes in the Component Repair Manual (CMM Manual); however, in actual repair processes, the inventors have found that limiting the diameter of the bearing mounting hole 211 to between 17.988 mm and 18.001 mm facilitates the installation of the bearing and the bearing mounting hole 211, and shortens repair time.

[0065] It should be noted that the diameters of the first connecting hole 221, the second connecting hole 231, the third connecting hole 241 and the fourth connecting hole 251 can be the same or different, but the diameters of all four holes are between 4.0640mm and 4.2672mm.

[0066] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present invention, and these improvements and substitutions should also be considered within the scope of protection of the present invention.

Claims

1. A method for repairing a baffle door, characterized in that, Includes the following steps: Step 1: The baffle door includes a door body and a bearing lug connected to the door body. The bearing lug has a bearing hole. Check the bearing hole of the bearing lug. If the diameter of the bearing hole is greater than 18.775mm, it is determined that the bearing lug has a damaged part and it should be repaired according to Step 2. Step 2: Clean the baffle door with acetone and dry the damaged parts of the bearing lug for more than 15 minutes; Step 3: Fabricate a hinge reinforcement according to the repair requirements of the bearing lug. The hinge reinforcement includes a lug and a connecting part fixedly connected to the lug. The lug is provided with a bearing assembly hole for replacing the bearing hole. The diameter of the bearing assembly hole is between 16.662 mm and 18.001 mm. Step 4: Remove the paint layer from the damaged portion of the bearing lug; Step 5: Using the lug as a repair template, remove the damaged part of the bearing lug by cutting to form a repair area on the bearing lug. The gap between the lug and the cut of the repair area shall not exceed 0.762mm. Clean the repair area with acetone. Step 6: Secure the baffle door to the assembly fixture, and clean the hinge reinforcement and the repair area with acetone; Step 7: Use protective tape to create a perimeter around the repair area. Apply sodium hydroxide solution to the repair area by wiping to form an etching solution. Rinse the repair area with clean water. Dry the baffle door with a drying device. Clean the repair area with acetone. After cleaning, ensure that there is no liquid residue in the repair area. Step 8: Apply a chemical conversion coating to the repair area and the hinge reinforcement; Step 9: Assemble the hinge reinforcement into the repair area and fix the hinge reinforcement using the assembly fixture; Step 10: Arrange multiple drilling positions on the connecting part, drill connecting holes through the connecting part and the baffle door at the drilling positions using drilling equipment, remove the hinge reinforcement from the assembly fixture and remove the hinge reinforcement from the repair area, remove debris from the baffle door and the hinge reinforcement, and clean the repair area and the hinge reinforcement with acetone; Step 11: Assemble the hinge reinforcement into the repair area and insert fasteners into the connection holes to fix the hinge reinforcement onto the baffle door.

2. The method for repairing a baffle door according to claim 1, characterized in that, The connecting part includes a first connecting part and a second connecting part. The first connecting part is connected to the lower end of the ear and is located on one side of the ear. The second connecting part is connected to the lower end of the ear and is located on the side of the ear opposite to the first connecting part. The connecting hole includes a first connecting hole and a second connecting hole; the first connecting hole passes through the first connecting part and the door body, and the second connecting hole passes through the second connecting part and the door body.

3. The method for repairing a baffle door according to claim 2, characterized in that, The baffle door also includes a first reinforcing rib and a second reinforcing rib, the first reinforcing rib being connected to the door body and the bearing lug respectively, and the second reinforcing rib being connected to the door body and the bearing lug respectively; The connecting part further includes a third connecting part and a fourth connecting part. The third connecting part is connected to the upper end of the first connecting part and is connected to the lug part. The fourth connecting part is connected to the upper end of the second connecting part and is connected to the lug part. The connecting hole also includes a third connecting hole and a fourth connecting hole. The third connecting hole passes through the third connecting portion and the first reinforcing rib, and the fourth connecting hole passes through the fourth connecting portion and the second reinforcing rib.

4. The method for repairing a baffle door according to claim 1, characterized in that, The diameter of the bearing assembly hole is between 17.988 mm and 18.001 mm.

5. The method for repairing a baffle door according to claim 1, characterized in that, In step seven, the sodium hydroxide solution is made from the following parts by weight of raw materials: 20 parts sodium hydroxide and 60-100 parts deionized water.

6. The method for repairing a baffle door according to claim 1, characterized in that, In step seven, the drying equipment is a hot air drying equipment.

7. The method for repairing a baffle door according to any one of claims 1-3, characterized in that, The diameter of the connecting hole is between 4.0640 mm and 4.2672 mm.

8. The method for repairing a baffle door according to claim 1, characterized in that, Step eleven includes the following specific steps: S1. Prepare adhesive and apply the adhesive evenly to the mating surface of the hinge reinforcement to form an adhesive layer on the mating surface of the hinge reinforcement. The thickness of the adhesive layer shall not exceed 0.762 mm. S2, assemble the hinge reinforcement onto the repair area; S3, using the adhesive, the fastener is inserted into the connection hole through a wet installation process to fix the hinge reinforcement onto the baffle door.

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