Method and device for repairing sunken part of skin in non-open area

Abstract

The invention provides a method for repairing a sunken part of a skin in a non-open area, which is characterized by comprising the following steps of: 1, determining the accurate position of a defect on the outer surface of the skin; 2, manufacturing a magnetic guide column 5; 3, determining the diameter of the vacuum chuck 1; 4, a closed negative pressure environment is formed on the contact surface of the vacuum suction cup 1 and the skin, adsorption force is generated through the pressure difference between the external atmospheric pressure and the internal vacuum, and the vacuum suction cup 1 is stably fixed to the inner surface of the skin; 5, positioning the accurate position of the skin inner surface defect; capturing the field intensity and direction change, and accurately positioning the center of the transparent cavity ring 10; 6, a guide baffle 9 is manufactured and knocked; 7, the outer surface of the repaired skin is checked, and if the design requirement is met, repairing is completed; if the requirement is not met, repeating the step 3 to the step 6; and 8, the steering function of the connecting rod structure 2 is utilized to adapt to different sunken parts of the skin.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of skin repair, in particular to a repair method and device for skin concave parts in non-open areas. BACKGROUND

[0002] In aircraft assembly, most of the components involve the installation of skin, such as wing box, vertical tail, horizontal tail, flap, etc. According to the requirements of aircraft structure design, there is insufficient operating space, and some skins need to be riveted, which can easily cause internal indentation faults in the skin during riveting. In addition, during the assembly process of large aircraft components such as wings and vertical tails, the internal structure of the large components is relatively complex, and the size is also relatively large, and the operation difficulty is also very large. The internal skin of the non-open area is often damaged by bumps, which can cause similar indentation faults, but due to the limited operating space, the traditional internal skin repair method has the problems of poor repair tool adaptability, low positioning accuracy, and low repair efficiency, which not only delays the production cycle, but also causes the aircraft skin to fail to meet the requirements of waviness, strength, and appearance quality, which can easily cause flight safety accidents. Only applicable to the case where there is enough operating space on the inside and outside of the skin. However, when the internal space of the skin is limited, these methods are difficult to implement. In order to solve the repair of such internal indentation faults of the skin, there is an urgent need for a skin indentation repair device and operation method that can accurately position and be stable and efficient. SUMMARY

[0003] The present application discloses a repair method and device for skin indentation parts in non-open areas, which is used to solve the problems of not being able to visually locate the center of the skin indentation area in non-open areas, and being difficult to control the size of the indentation area during repair, low repair efficiency, position deviation, and unqualified appearance surface quality after repair, thereby causing unnecessary rework problems, so as to improve the repair efficiency and accuracy of the skin indentation, reduce the rework cost, reduce the labor intensity of the operator, and ensure the normal production and manufacturing progress.

[0004] In a first aspect, the present application provides a repair method for skin indentation parts in non-open areas, characterized in that it comprises the following steps: Step 1: identifying the structure of the skin in the non-open area, and determining the accurate position of the defect on the outer surface of the skin; Step 2: determining the diameter of the magnetic guide column 5 according to the size of the defect area, and manufacturing the magnetic guide column 5; Step 3: calculating the actual adsorption force to determine the diameter of the vacuum suction cup 1; Step 4: using vacuum adsorption technology, through the principle of negative pressure adsorption, forming a closed negative pressure environment between the vacuum suction cup 1 and the contact surface of the skin, and using the pressure difference between the external atmospheric pressure and the internal vacuum to generate adsorption force, so as to stably fix the vacuum suction cup 1 on the inner surface of the skin. Step 5: Use magnetic positioning to locate the exact position of the inner surface defect of the skin; The field strength and direction change are captured to the center of the transparent cavity ring 10 for accurate positioning; Step 6: Make a guide baffle 9 and knock; Step 7: Use the skin shape detection tool to check the outer surface of the repaired skin. If it meets the design requirements, the repair is complete. If it does not meet the requirements, repeat steps 3 to 6; Step 8: Repair all defect sites using the steering function of the connecting rod structure 2 for different parts of the skin recess.

[0005] Specifically, step 1 includes: According to the non-open nature of the skin recess fault, the endoscope probe is inserted into the structure inside the skin of the non-open area to detect the skin internal recess and determine the exact position of the skin outer surface defect.

[0006] Specifically, step 3 includes: Given the atmospheric pressure standard value, vacuum system pressure value, and effective adsorption area, the required actual adsorption force is calculated using the formula F = P_vacuum x A to determine the diameter of the vacuum chuck 1, Where: F is the vacuum adsorption force, P_vacuum is the vacuum degree acting on the effective adsorption area of the chuck.

[0007] Specifically, step 4 includes: Step 4-1, use a diameter of φ50mm elastic material to make a vacuum chuck 1; Step 4-2, connect and fix the vacuum chuck 1 through the connecting rod structure 2 using screws 7; Step 4-3, two connecting rod structures 2 with vacuum chucks 1 are fixed through the outer threaded center hole 6 and nut 8; Step 4-4, use a hose to make an air pipe 3, one end connected to compressed air, and the other end divided into two paths connected to two vacuum chucks 1 respectively.

[0008] Specifically, step 5 includes: Step 5-1, use transparent material to make a transparent cavity ring 10, and put a steel ball 4 into the transparent cavity ring 10; Step 5-2, by placing the transparent cavity ring 10 with steel ball 4 on the outer surface of the skin, form a recognizable magnetic field feature, and monitor the magnetic field around the steel ball 4 in real time.

[0009] Specifically, step 6 includes: Step 6-1, according to the area of the skin internal recess, make an aluminum plate guide baffle 9 to limit the knocking range; Step 6-2, insert the magnetic guide column 5 into the outer threaded center hole 6; Step 6-3, use a wooden hammer to knock the magnetic guide column 5 in the defined area to repair the skin internal recess.

[0010] In a second aspect, the application provides a repair device for the recess of the skin in the non-open area, comprising a vacuum chuck (1), a connecting rod structure (2), an air pipe (3), a steel ball (4), a magnetic guide column (5), an outer threaded center hole (6), a screw (7), a nut (8), a guide baffle (9), and a transparent cavity ring (10), wherein: The vacuum chuck (1) is a vacuum disc made of rubber material, and the top is connected and fixed with the connecting rod structure 2 by the screw 7; the side is connected with the air pipe 3; the connecting rod structure (2) is connected and fixed with the two vacuum chucks 1 by the screw 7; the air pipe (3) is a kind of hose, one end is connected with compressed air, and the other end is divided into two ways and connected with two vacuum chucks 1 respectively; the magnetic guide column (5) is a cylindrical column made of a material with strong magnetic force, the two ends are exposed, and the arc transition does not block; the guide baffle (9) is a baffle with a size limited to the defect, and is connected and fixed with the connecting rod structure 2 by the screw 7; the transparent cavity ring (10) is a kind of transparent material with arc, and the steel ball is put inside. Specifically, the diameter of the magnetic guide column 5 is 10mm, and the magnetic guide column 5 is wrapped with an aluminum material.

[0011] Specifically, the diameter of the magnetic guide column 5 is equal to or less than the minimum straight line distance of the skin internal recess.

[0012] In summary, the application provides a repair method and device for the recess of the skin in the non-open area, which realizes the force field penetrating the skin through the magnetic resistance sensor, solves the problem of accurate positioning and stable and efficient repair of the skin recess in the non-open area; through the combination of vacuum adsorption and connecting rod steering function, it is suitable for automatic matching of narrow space and complex curvature working conditions and suitable for repairing the skin internal recess in different parts. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 An execution flow chart of the repair method for the recess of the skin in the non-open area is provided for the application; Figure 2 A structure diagram of the repair device for the recess of the skin in the non-open area is provided for the application; Wherein: 1-vacuum chuck, 2-connecting rod structure, 3-air pipe, 4-steel ball, 5-magnetic guide column, 6-outer threaded center hole, 7-screw, 8-nut, 9-guide baffle, 10-transparent cavity ring. DETAILED DESCRIPTION

[0014] The following will be described in combination with the drawingsFigure 1 、 2 and specific embodiments to further illustrate the present application.

[0015] Example One As shown in Figure 1 The present application provides a method for repairing the recessed part of the non-open area skin, comprising the following steps: Step 1: Identify the structure of the non-open area skin, and determine the exact location of the defect on the outer surface of the skin; Specifically, step 1 includes: according to the non-open nature of the skin recess fault, the endoscope probe is inserted into the interior of the non-open area skin structure, the skin interior recess is detected, and the exact location of the defect on the outer surface of the skin is determined.

[0016] Step 2: Determine the diameter of the magnetic guide column 5 according to the size of the defect area, and make the magnetic guide column 5; Wherein, the diameter of the magnetic guide column 5 is equal to or less than the minimum straight line distance of the skin interior recess part.

[0017] Specifically, the manufacturing steps of the magnetic guide column 5 are as follows: The magnetic guide column 5 is made of a material with strong magnetic force, the diameter of the magnetic guide column 5 is 10mm, the magnetic guide column 5 is wrapped with a layer of aluminum material, the both ends of the magnetic guide column 5 are exposed, and the circular arc transition is not blocked.

[0018] Step 3: Calculate the actual adsorption force and determine the diameter of the vacuum chuck 1; Specifically, step 3 includes: given the atmospheric pressure standard value, the vacuum system pressure value and the effective adsorption area, the required actual adsorption force is calculated by the formula F=P_vacuum x A, and the diameter of the vacuum chuck 1 is determined.

[0019] In practical application, the diameter of the vacuum chuck 1 is determined to be φ50mm; or according to the vacuum system selection reference theory adsorption force is 103.4Kpa, the corresponding selection of vacuum chuck 1 diameter is φ50mm; both methods can determine the chuck diameter.

[0020] First, the required actual adsorption force is calculated by the formula F=P_vacuum x A, and the diameter of the vacuum chuck 1 is determined.

[0021] Where: F is the vacuum adsorption force (unit: Newton N) P_vacuum is the vacuum degree acting on the effective adsorption area of the chuck (unit: Pascal) P_vacuum=P0-P P0 is the atmospheric pressure standard value; P is the vacuum system pressure value A is the effective adsorption area; for a standard disc-shaped suction cup: A = Πx(d / 2)²² The second method, based on the theoretical adsorption force of 103.4 kPa in the vacuum system selection reference manual, corresponds to selecting a vacuum suction cup 1 with a diameter of φ50 mm; Step 4: Using vacuum adsorption technology, the vacuum suction cup 1 is made to form a closed negative pressure environment with the skin contact surface through the principle of negative pressure adsorption. The pressure difference between the external atmospheric pressure and the internal vacuum generates adsorption force, which firmly fixes the vacuum suction cup 1 to the inner surface of the skin.

[0022] Specifically, step 4 includes: Step 4-1: Make 1 (2) vacuum suction cups using elastic material with a diameter of φ50mm.

[0023] Step 4-2: Connect and fix the vacuum suction cup 1 using screws 7 via the connecting rod structure 2; Step 4-3: The two connecting rod structures 2 with vacuum suction cups 1 are fixed by the external threaded center hole 6 and the nut 8.

[0024] Step 4-4: Use a flexible hose to make an air duct 3. One end is connected to compressed air, and the other end is split into two paths and connected to two vacuum suction cups 1 respectively.

[0025] Step 5: Use magnetic positioning to pinpoint the exact location of defects on the inner surface of the skin; Specifically, step 5 includes: Step 5-1: Using transparent material, make a transparent hollow ring 10 and put a steel ball 4 with a diameter of 2mm into the transparent hollow ring 10.

[0026] Step 5-2: By placing a transparent hollow ring 10 containing steel balls 4 on the outer surface of the skin, an identifiable magnetic field feature is formed. The center of the transparent hollow ring 10 is captured by real-time monitoring of the magnetic field strength and direction changes around the steel balls 4 through magnetic force for precise positioning.

[0027] Step 6: Make guide baffle 9 and tap it; Specifically, step 6 includes: Step 6-1: Based on the area of ​​the recessed area inside the skin, make an aluminum plate guide baffle 9 to limit the impact range.

[0028] Step 6-2: Insert the magnetic guide post 5 into the external thread center hole 6.

[0029] Step 6-3: Use a wooden mallet to tap the magnetic guide post 5 in the designated area to repair the recessed parts inside the skin.

[0030] Step 7: Use the skin shape inspection tool to inspect the repaired skin outer surface. If it meets the design requirements, the repair is complete; if it does not meet the requirements, repeat steps 3 to 6.

[0031] Step 8: Repair all defective parts and use the steering function of the linkage structure 2 to repair different parts of the skin dent.

[0032] Among them, the linkage structure 2 has a steering function, which can rotate in any direction, making it convenient to repair an internal dent under the skin from different angles and parts.

[0033] As can be seen from the above examples, the repair method for dented areas of skin provided by this invention solves the problem of direct construction in closed areas by using an inner and outer dual magnetic pole array to achieve force field penetration through the skin. This also improves the efficiency and accuracy of skin dent repair, reduces rework costs, and alleviates the labor intensity of operators.

[0034] Example 2 like Figure 2 As shown, this application provides a repair device for dented areas of skin in non-open areas, including a vacuum suction cup (1), a connecting rod structure (2), an air duct (3), a steel ball (4), a magnetic guide post (5), an externally threaded center hole (6), a screw (7), a nut (8), a guide baffle (9), and a transparent cavity ring (10), wherein: The vacuum suction cup (1) is a vacuum disc made of rubber with a diameter of φ50mm. There are 2 of them. The top is connected and fixed to the connecting rod structure 2 by screws 7; the side is connected to the air duct 3.

[0035] The linkage structure (2) is a structure for connecting the vacuum suction cup 1. It can be a single part or a combination of multiple parts. The material, shape and size are not limited. It is connected and fixed to the vacuum suction cup 1 (2) by screws 7.

[0036] The air duct (3) is a flexible hose, with one end connected to compressed air and the other end split into two paths that are connected to two vacuum suction cups 1 respectively.

[0037] The magnetic guide post (5) is a cylinder with a diameter of 10mm made of a material with strong magnetic force. It is wrapped with an aluminum material on the outside, with both ends exposed and rounded to avoid obstruction.

[0038] The guide baffle (9) is a baffle made of aluminum with no shape limit to the size of the defect, and is connected and fixed to the connecting rod structure 2 by screws 7.

[0039] The transparent hollow ring (10) is a transparent material with an arc, with two layers connected and fixed. The connection method is not limited, and a steel ball with a diameter of 2mm is placed inside. This application provides a repair device for dented areas of non-open skin, specifically comprising: two vacuum suction cups 1 made of elastic material (rubber material) with a diameter of φ50mm; two connecting rod structures 2 made of aluminum plate with a thickness of 6mm and a width of 40mm; the two connecting rod structures 2 are respectively connected and fixed to the two vacuum suction cups 1 by screws 7; the vacuum suction cups 1 and connecting rod structures 2 are fixed by external threaded center holes 6 and nuts 8; two guide baffles 9 made of aluminum plate with a thickness of 3mm and a length of 20mm are respectively connected and fixed to the two connecting rod structures 2 by screws 7; two air ducts 3 made of flexible hose with a diameter of 10mm are used, one end of which is connected to compressed air, and the other end is split into two paths and connected to the two vacuum suction cups 1 respectively; a cylinder with a diameter of 10mm is made of a material with strong magnetic force (strong magnet), and wrapped with a layer of soft aluminum with a thickness of 2mm, with both ends exposed and rounded to form a magnetic guide post 5. Insert the magnetic guide post 5 into the external threaded center hole 6. Place the 2mm diameter steel ball 4 into the transparent hollow ring 10.

Claims

1. A method for repairing dents in non-open areas of skin, characterized in that, Includes the following steps: Step 1: Identify the structure of the non-open area skin and determine the exact location of the defect on the outer surface of the skin; Step 2: Determine the diameter of the magnetic guide post (5) based on the size of the defect area, and fabricate the magnetic guide post (5); Step 3: Calculate the actual adsorption force and determine the diameter of the vacuum suction cup (1); Step 4: Using vacuum adsorption technology, the vacuum suction cup (1) and the skin contact surface are made to form a closed negative pressure environment through the principle of negative pressure adsorption. The pressure difference between the external atmospheric pressure and the internal vacuum is used to generate adsorption force, and the vacuum suction cup (1) is firmly fixed on the inner surface of the skin. Step 5: Use magnetic positioning to pinpoint the exact location of defects on the inner surface of the skin; The changes in field intensity and direction are captured and accurately located at the center of the transparent hollow ring (10); Step 6: Make a guide baffle (9) and tap it; Step 7: Use a skin shape inspection tool to inspect the outer surface of the repaired skin. If it meets the design requirements, the repair is complete. If the requirements are not met, repeat steps 3 through 6. Step 8: Repair all defective parts and use the steering function of the linkage structure (2) to apply to different parts of the skin dent.

2. The repair method according to claim 1, characterized in that, Step 1 includes: Based on the non-open nature of the skin dent fault, the endoscope probe is inserted into the internal structure of the non-open area of ​​the skin to detect the internal dent and determine the accurate location of the defect on the outer surface of the skin.

3. The repair method according to claim 1, characterized in that, Step 3 includes: Given the standard value of atmospheric pressure, the pressure value of the vacuum system, and the effective adsorption area, the required actual adsorption force is calculated using the formula F=P_vacuum xA, and the diameter of the vacuum suction cup (1) is determined. Where: F is the vacuum adsorption force, and P_vacuum is the vacuum degree acting on the effective adsorption area of ​​the suction cup.

4. The repair method according to claim 1, characterized in that, Step 4 includes: Step 4-1: Make a vacuum suction cup using an elastic material with a diameter of φ50mm (1); Step 4-2: Connect and fix the vacuum suction cup (1) using screws 7 through the linkage structure (2); Step 4-3: The two connecting rod structures (2) with vacuum suction cups (1) are fixed by the external thread center hole 6 and the nut 8; Step 4-4: Use a flexible hose to make an air duct (3). One end is connected to compressed air, and the other end is split into two paths and connected to two vacuum suction cups (1) respectively.

5. The repair method according to claim 1, characterized in that, Step 5 includes: Step 5-1: Use transparent material to make a transparent hollow ring (10), and put the steel ball 4 into the transparent hollow ring (10); Step 5-2: By placing a transparent hollow ring (10) containing steel balls (4) on the outer surface of the skin, an identifiable magnetic field feature is formed, and the magnetic field around the steel balls (4) is monitored in real time by magnetic force.

6. The repair method according to claim 1, characterized in that, Step 6 includes: Step 6-1: Based on the area of ​​the recessed area inside the skin, make an aluminum plate guide baffle (9) to limit the impact range; Step 6-2: Insert the magnetic guide post (5) into the center hole (6) of the external thread; Step 6-3: Use a wooden mallet to tap the magnetic guide post (5) in the designated area to repair the recessed parts inside the skin.

7. A repair device for dented areas of skin in non-open areas, characterized in that, Includes a vacuum suction cup (1), a connecting rod structure (2), an air duct (3), a steel ball (4), a magnetic guide post (5), an external threaded center hole (6), a screw (7), a nut (8), a guide baffle (9), and a transparent hollow ring (10), wherein: Vacuum suction cup (1) is a vacuum disc made of rubber. The top is connected and fixed to the connecting rod structure (2) by screws (7). The side is connected to the air duct (3). The connecting rod structure (2) is connected and fixed to the two vacuum suction cups (1) by screws (7). The air duct (3) is a flexible hose. One end is connected to compressed air, and the other end is divided into two paths and connected to the two vacuum suction cups (1) respectively. The magnetic guide column (5) is a cylinder made of a material with strong magnetic force. Both ends are exposed and have a rounded transition without obstruction. The guide baffle (9) is a baffle that limits the size of the defect. It is connected and fixed to the connecting rod structure (2) by screws (7). The transparent cavity ring (10) is a transparent material with an arc and contains steel balls.

8. The repair device according to claim 7, characterized in that, The magnetic guide post (5) has a diameter of 10 mm and is wrapped with an aluminum material.

9. The repair method according to claim 1, characterized in that, The diameter of the magnetic guide post (5) is equal to or less than the minimum straight-line distance of the recessed part inside the skin.

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