A method for inspecting a large area of a bonded internal mating gap

Abstract

The application relates to a large-area bonding gap checking method, and belongs to the technical field of composite material bonding. A large-area bonding internal gap checking method is used for checking the fitting gap between a skin and a reinforcing rib, and comprises the following steps: surface treatment of the skin, laying detection glue points on the surface of the skin after surface treatment; according to the fitting relationship of the fitting gap, the reinforcing rib is placed on the skin, and detection pressure is applied to the skin from the reinforcing rib; the reinforcing rib and the skin are separated, and whether the detection glue points are all transferred from the surface of the skin to the surface of the reinforcing rib is checked, so that the fitting gap is checked. The fitting gap checking method can reduce the checking cost and process, and can check the whole fitting gap profile of the bonding surface between the skin and the reinforcing rib.

Description

Technical Field

[0001] This application relates to the field of composite material bonding technology, and in particular to a method for inspecting the internal fit gaps of large-area adhesive bonding. Background Technology

[0002] Co-bonded reinforced wall panels refer to panels in which the skin to be bonded is cured first, while the reinforcing ribs to be bonded are laid out but not cured. The laid-out reinforcing ribs and skin are bonded together with adhesive film to form an integral wall panel. The position and dimensions of the reinforcing ribs are guaranteed by the reinforcing rib forming mold.

[0003] Generally, the fit clearance of reinforced panels before bonding is checked using a thermal calibration method. During calibration, the same operating parameters as during curing are used. A calibration membrane is used to detect the fit clearance between the skin and the reinforcing ribs, and the change in thickness caused by pressure on the calibration membrane is used to determine whether the fit clearance meets the requirements. Using a thermal calibration method in an autoclave is costly, has a long manufacturing cycle, and involves complex procedures. Besides calibration membrane testing, a micrometer shim can also be used to check the bonding gap. However, micrometer shim testing also has drawbacks; it can only detect the edge areas of the mating surfaces between the reinforcing ribs and the skin, and cannot detect the internal gaps within the mating surfaces.

[0004] In view of this, in order to overcome the shortcomings of the existing technology, a method for inspecting the internal fit gap of large-area adhesive bonding is provided. Summary of the Invention

[0005] This application provides a method for inspecting the internal fit gap of large-area adhesive bonding in order to solve the above-mentioned technical problems, thereby addressing the difficulties in inspecting the overall surface of the skin and reinforcing rib mating surfaces, the high cost of checking the fit gap, and the complexity of the process in the prior art when large-area co-bonding is carried out.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A method for inspecting the internal fit clearance of large-area adhesive bonding, the method being used to inspect the fit clearance between the skin and the reinforcing rib, comprising the following steps:

[0008] The skin is surface-treated, and detection adhesive dots are laid on the surface of the surface-treated skin.

[0009] Based on the fit relationship of the aforementioned fit clearance, the reinforcing rib is placed on the skin, and a detection pressure is applied from the reinforcing rib toward the skin;

[0010] Separate the reinforcing rib and the skin, and check whether all the detection adhesive dots have been transferred from the surface of the skin to the surface of the reinforcing rib in order to check the mating gap.

[0011] Optionally, the step of checking whether all the detection adhesive dots have been transferred from the surface of the skin to the surface of the reinforcing rib includes:

[0012] When untransferred detection adhesive dots are found on the skin surface, the compensation area that does not meet the mating relationship is determined based on the location of the untransferred detection adhesive dots.

[0013] The compensation area is then repaired.

[0014] Returning to the step of placing the reinforcing rib on the skin according to the fit relationship of the fit gap, and applying detection pressure from the reinforcing rib toward the skin, until all the detection adhesive dots are transferred from the surface of the skin to the surface of the reinforcing rib.

[0015] Optionally, the step of determining the compensation region that does not satisfy the mating relationship based on the location of the untransferred detection adhesive dots includes:

[0016] A test area is formed with the location of the untransferred test adhesive dot as the center and R as the radius;

[0017] Remove the detection adhesive dots and apply test adhesive dots to the surface of the detection area;

[0018] Based on the fit relationship of the aforementioned fit clearance, the reinforcing rib is placed on the skin, and a test pressure is applied from the reinforcing rib toward the skin; wherein, the test pressure is the same as the detection pressure;

[0019] Separate the reinforcing rib and the skin, and determine the area where the repair adhesive dots that have not been transferred are distributed within the test area, which is the compensation area.

[0020] Optionally, the test adhesive dots are fully laid on the surface of the test area, and there is no interference between adjacent test adhesive dots.

[0021] Optionally, the steps for compensating and repairing the compensation area include:

[0022] Based on the shape of the compensation area, a compensation film identical to the compensation area is cut;

[0023] The compensation film is laid on the skin surface corresponding to the compensation area;

[0024] The compensating adhesive film is heat-treated to ensure it adheres properly.

[0025] Optionally, the density of the adhesive dots used for testing is 100–400 pcs / m. 2 The size of the test adhesive dots is 0.5–2 cm. 2 .

[0026] Optionally, the detection pressure is 10–20 kPa.

[0027] Optionally, the surface treatment steps include:

[0028] The surface of the skin is roughened;

[0029] A base adhesive film is laid on the surface of the skin after surface roughening treatment, and the base adhesive film is compacted.

[0030] Optionally, the compaction process is carried out under full vacuum conditions at 60°C.

[0031] Optionally, the thickness of the base adhesive film after compaction is the same as the thickness of the test adhesive point.

[0032] Compared with the prior art, the beneficial effects of this application are:

[0033] 1. This application uses a method of laying test adhesive dots on the skin surface and checking the transfer of these dots to the reinforcing ribs to determine whether the fit clearance between the skin and the reinforcing ribs meets the requirements. Since the physical effects of the test adhesive dots on the skin and the reinforcing ribs are different, when the fit clearance between the skin and the reinforcing ribs does not meet the requirements, the physical effect between the test adhesive dots and the reinforcing ribs is less than the physical effect between the test adhesive dots and the skin. Therefore, after separating the skin and the reinforcing ribs, if untransferred test adhesive dots appear on the skin surface, it indicates that the fit clearance between the skin and the reinforcing ribs does not meet the requirements.

[0034] 2. This application only needs to check the transfer of adhesive dots to examine the fit relationship between the skin and the reinforcing rib. The inspection can be carried out at room temperature without the need for testing in an autoclave, which reduces the inspection cost. It can inspect the inside of the fit gap and quickly check the fit of the adhesive fit gap inside and outside the surface. The operation is simple and the inspection quality is high. Attached Figure Description

[0035] Figure 1 A flowchart illustrating the principle of the method for inspecting the internal fit gap of large-area adhesive bonding provided in the embodiments of this application;

[0036] Figure 2 A flowchart illustrating the principle of inspecting the gap of adhesive bonding on a plane, as provided in the embodiments of this application;

[0037] Figure 3 A flowchart illustrating the principle of determining a compensation region on a plane, provided for embodiments of this application;

[0038] Figure 4 A flowchart illustrating the principle of inspecting the gap of adhesive bonding on a curved surface, as provided in an embodiment of this application;

[0039] Figure 5 This is a flowchart illustrating the principle of compensation and repair on curved surfaces, as provided in an embodiment of this application.

[0040] The attached diagram lists the components represented by each number as follows:

[0041] 1. Skin; 2. Base adhesive film; 3. Test adhesive point; 301. Untransferred test adhesive point; 302. Transferred test adhesive point; 4. Reinforcing rib; 5. Test area; 6. Test adhesive point; 601. Untransferred test adhesive point; 602. Transferred test adhesive point; 7. Compensation area; 8. Compensation adhesive film. Detailed Implementation

[0042] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with 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 of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0043] Example 1

[0044] Based on the appendix Figure 1-3 This embodiment provides a method for inspecting the internal fit gap of a large-area adhesive bond. This method is used to inspect the fit gap between the skin 1 and the reinforcing rib 4. The fit gap between the skin 1 and the reinforcing rib 4 is planar. The inspection method includes the following steps:

[0045] S1. Surface-treated skin 1, with test adhesive dots 3 laid on the surface of the surface-treated skin 1;

[0046] In this embodiment, the surface treatment is to roughen the surface of the skin 1, lay a base film 2 on the surface of the roughened skin 1, and compact the base film 2 to obtain the skin / film system.

[0047] Roughening the surface of the skin 1 can improve the adhesion between the base adhesive film 2 and the surface of the skin 1. In particular, when the detection adhesive point 3 is transferred to the surface of the reinforcing rib 4, the detection adhesive point 3 will exert a tensile force on the base adhesive film 2. The roughening treatment can make the base adhesive film 2 stable when subjected to the tensile force of the detection adhesive point 3. Otherwise, it will interfere with the inspection results of the mating clearance.

[0048] In this embodiment, the compaction treatment of the base film 2 is carried out in a full vacuum in an oven or autoclave, and the compaction temperature is 60°C.

[0049] The compaction process of the base adhesive film 2 is as follows: after the skin 1 has been cured on the tooling, the base adhesive film 2 is laid on the surface of the bonding gap of the skin 1 to form a skin / base adhesive film system. The entire skin / base adhesive film system is sealed in a vacuum bag, the vacuum bag is evacuated, and then placed in an oven or autoclave and heated to 60°C for compaction, so that the base adhesive film 2 and the skin 1 are tightly bonded together.

[0050] In this embodiment, the base adhesive film 2 is compacted to lay the test adhesive dots 3. After the fit relationship of the fit gap is checked and found to be qualified, the base adhesive film 2 can be retained on the surface of the skin 1 for the bonding treatment between the skin 1 and the reinforcing rib 4.

[0051] In this embodiment, the density of the adhesive dots 3 is 100–400 pcs / m. 2 The size of test glue dots 6 ranges from 0.5 to 2 cm. 2 ;

[0052] Among them, the detection adhesive dots 3 are evenly laid on the side surface of the base film 2 away from the skin 1. The detection adhesive dots 3 are made of the same material as the base film 2, and the thickness of the detection adhesive dots 3 is the same as the thickness of the base film 2 after compaction.

[0053] In some instances, the materials of the detection adhesive dots 3 and the base adhesive film 2 are bismaleimide structural adhesive or epoxy resin structural adhesive; in this embodiment, the materials of the detection adhesive dots 3 and the base adhesive film 2 are bismaleimide J-299 adhesive film.

[0054] S2. Based on the fit relationship of the fit clearance, place the reinforcing rib 4 on the skin 1, and apply the test pressure from the reinforcing rib 4 toward the skin 1.

[0055] The reinforcing rib 4 includes a reinforcing rib blank and a reinforcing rib 4 forming mold. The reinforcing rib blank is wrapped around the outside of the reinforcing rib forming mold. The reinforcing rib blank is not cured, so that the bonding force between the reinforcing rib blank and the test adhesive point 6 is greater than the bonding force between the test adhesive point 6 and the base adhesive film 2.

[0056] In this embodiment, the detection pressure is 10–20 kPa;

[0057] The specific application of the testing pressure is as follows: the skin 1 is fixed, and according to the fit relationship of the fit clearance, the testing pressure is applied from the reinforcing rib 4 towards the skin 1. The testing pressure is 10-20 kPa.

[0058] In this embodiment, the magnitude of the detection pressure depends on the material of the test adhesive point 6. When the material of the test adhesive point 6 is smectite J-299 film, the detection pressure is 10-20 kPa. Using this detection pressure, the test adhesive point 3 in the area where the fit between the skin 1 and the reinforcing rib 4 meets the fit relationship is in full contact with the reinforcing rib 4. When the part between the skin 1 and the reinforcing rib 4 does not meet the fit relationship, the corresponding test adhesive point 3 cannot contact the reinforcing rib 4. After the reinforcing rib 4 separates from the skin 1, the test adhesive point 3 that is in full contact with the reinforcing rib 4 is transferred to the surface of the reinforcing rib 4, while the test adhesive point 3 that is not in contact with the reinforcing rib 4 is not transferred.

[0059] Therefore, by checking whether the test glue point 3 is completely transferred to the surface of the reinforcing rib 4, it can be determined whether the fit relationship between the skin 1 and the reinforcing rib 4 meets the requirements. Only when the test glue point 6 is completely transferred to the reinforcing rib 4 in one inspection process does it indicate that the fit relationship between the skin 1 and the reinforcing rib 4 meets the requirements.

[0060] The detection pressure here refers to the pressure exerted by the reinforcing rib 4 on the detection adhesive point 3 when the detection adhesive point 3 is in full contact with the surface of the reinforcing rib 4.

[0061] In some instances, when applying the testing pressure, opposite forces can be applied to the skin 1 and the reinforcing rib 4 simultaneously, so that the skin 1 and the reinforcing rib 4 tend to move closer to each other, thereby forming the testing pressure.

[0062] S3. Separate the reinforcing rib 4 and the skin 1, and check whether the detection adhesive dots 3 have all been transferred from the surface of the skin 1 to the surface of the reinforcing rib 4.

[0063] In this process, the reinforcing rib 4 and the skin 1 are separated. When the skin 1 is fixed, a force opposite to the detection pressure is applied to the reinforcing rib 4, causing the reinforcing rib 4 and the skin 1 to move away from each other.

[0064] In this embodiment, the reinforcing rib blank of the reinforcing rib 4 is not cured. Its adhesion to the detection adhesive point 3 is stronger than the adhesion between the detection adhesive point 3 and the base adhesive film 2. When the reinforcing rib 4 is separated from the skin 1, the detection adhesive point 3 is transferred to the surface of the reinforcing rib blank, which is the transferred detection adhesive point 302.

[0065] When the clearance fit between the skin 1 and the reinforcing rib 4 does not meet the fit relationship, the reinforcing rib blank of the reinforcing rib 4 cannot effectively contact the detection adhesive point 3. The adhesion between the detection adhesive point 3 and the reinforcing rib 4 that cannot effectively contact is less than the adhesion between the detection adhesive point 3 and the base adhesive film 2. After the skin 1 and the reinforcing rib 4 separate, the detection adhesive point 3 cannot be transferred to the reinforcing rib blank of the reinforcing rib 4, which is the untransferred detection adhesive point 301.

[0066] Therefore, by checking whether all the adhesive dots 3 have been transferred from the surface of the skin 1 to the surface of the reinforcing rib 4, the fit relationship between the skin 1 and the reinforcing rib 4 can be determined.

[0067] In this embodiment, when untransferred detection adhesive dots 301 are found on the surface of the skin 1, the compensation area 7 that does not meet the fit relationship is determined according to the location of the untransferred detection adhesive dots 301; the compensation area 7 is compensated and repaired, and the process returns to the step of placing the reinforcing rib 4 on the skin 1 according to the fit relationship of the fit gap, and applying detection pressure from the reinforcing rib 4 toward the skin 1 until all the detection adhesive dots 3 are transferred from the surface of the skin 1 to the surface of the reinforcing rib 4.

[0068] In this embodiment, the step of determining the compensation region 7 that does not meet the fit relationship based on the location of the untransferred detection adhesive dots 301 includes: forming a test region 5 with the location of the untransferred detection adhesive dots 301 on the skin 1 as the center and R as the radius; removing the untransferred detection adhesive dots 301 and the transferred detection adhesive dots 302, and laying test adhesive dots 6 on the surface of the test region 5; placing the reinforcing rib 4 on the skin 1 again according to the fit relationship of the fit gap, and applying test pressure from the reinforcing rib 4 toward the skin 1; wherein the test pressure is the same as the detection pressure; separating the reinforcing rib 4 and the skin 1, and determining the area in the test region 5 where the untransferred test adhesive dots 601 are distributed, which is the compensation region 7;

[0069] The radius R is determined based on the untransferred detection adhesive dots 301 on the skin 1. The test area 5 is the area covered by a circle with radius R centered on the location of the untransferred detection adhesive dots 301.

[0070] When all other detection adhesive dots 3 adjacent to the untransferred detection adhesive dot 301 are transferred to the surface of the reinforcing rib 4, the farthest adjacent detection adhesive dot 3 is found, and the distance between the farthest adjacent detection adhesive dot 3 and the untransferred detection adhesive dot 301 is R.

[0071] When there are multiple untransferred detection adhesive dots 301 on the skin 1, first determine the center of the area as the center of the circle based on the area range of the area, and then find the transfer detection adhesive dot 3 that is farthest from the center and adjacent to the area range. The distance between the two is R.

[0072] The test adhesive dots 6 on the surface of test area 5 are partially transferred to the surface of reinforcing rib 4, becoming the transferred test adhesive dots 602;

[0073] The test adhesive dots 6 remaining on the surface of test area 5 are untransferred test adhesive dots 601, and the area formed thereby is the compensation area 7.

[0074] In this embodiment, the test adhesive dots 6 are fully laid on the surface of the test area 5, and there is no interference between adjacent test adhesive dots 6. No interference between adjacent test adhesive dots 6 means that there is no adhesive connection between adjacent test adhesive dots 6.

[0075] The size of test glue dots 6 is 0.2–0.5 cm. 2 .

[0076] In this embodiment, the steps for compensating and repairing the surface of the skin 1 corresponding to the compensation area 7 include:

[0077] Based on the shape of the compensation area 7, a compensation film 8 identical to the compensation area 7 is cut;

[0078] The compensation film 8 is laid on the surface of the skin 1 corresponding to the compensation area 7;

[0079] Heat treatment was applied to ensure the compensating adhesive film 8 was properly bonded.

[0080] The shape and size of the compensation film 8 are the same as those of the compensation area 7. The cut compensation film 8 is laid on the compensation area 7 on the surface of the base film 2 in a non-discriminatory manner.

[0081] The steps for heat-treating and firmly attaching the compensating adhesive film 8 include: after the compensating adhesive film 8 is laid, using an iron to iron the compensating adhesive film 8 firmly, with the temperature of the iron being less than 60℃;

[0082] When multiple non-adjacent untransferred detection adhesive dots 301 appear between the skin 1 and the reinforcing rib 4, or when multiple areas formed by multiple untransferred detection adhesive dots 301 appear, resulting in multiple compensation areas 7 between the skin 1 and the reinforcing rib 4, all compensation areas 7 need to be repaired before a re-inspection.

[0083] S4. When all the test adhesive dots 3 have been transferred from the surface of the skin 1 to the surface of the reinforcing rib 4, it indicates that the fit clearance between the skin 1 and the reinforcing rib 4 meets the requirements of the fit relationship, and the inspection is completed.

[0084] In some instances, the position of the detection glue point 3 is adjusted when the steps are repeated for multiple checks.

[0085] In some instances, during a review or inspection, if the skin 1 separates from the reinforcing rib 4 and the detection adhesive dots 3 are transferred, and if the base adhesive film 2 detaches from the surface of the skin 1 under the action of the detection adhesive dots 3, the base adhesive film 2 should be re-compacted or removed and then a new base adhesive film 2 should be re-compacted, and the surface of the skin 1 should be roughened again.

[0086] S5. After the gap inspection is completed and qualified, the skin 1 and the reinforcing rib 4 are glued together according to the fit relationship of the glued gap.

[0087] Example 2

[0088] Based on the appendix Figure 1 Appendix Figure 4 and attached Figure 5 This embodiment provides a method for inspecting the internal fit clearance of large-area adhesive bonding. This method is used to inspect the fit clearance between the skin 1 and the reinforcing rib 4. The fit clearance between the skin 1 and the reinforcing rib 4 includes both planar and curved surfaces. The inspection method includes the following steps:

[0089] S1. Surface-treated skin 1, with test adhesive dots 3 laid on the surface of the surface-treated skin 1;

[0090] In this embodiment, the surface treatment is to roughen the surface of the skin 1, lay a base film 2 on the surface of the roughened skin 1, and compact the base film 2 to obtain the skin / film system.

[0091] Roughening the surface of the skin 1 can improve the adhesion between the base adhesive film 2 and the surface of the skin 1. In particular, when the detection adhesive point 3 is transferred to the surface of the reinforcing rib 4, the detection adhesive point 3 will exert a tensile force on the base adhesive film 2. The roughening treatment can make the base adhesive film 2 stable when subjected to the tensile force of the detection adhesive point 3. Otherwise, it will interfere with the inspection results of the mating clearance.

[0092] In this embodiment, the compaction treatment of the base film 2 is carried out in a full vacuum in an oven or autoclave, and the compaction temperature is 60°C.

[0093] The compaction process of the base adhesive film 2 is as follows: after the skin 1 has been cured on the tooling, the base adhesive film 2 is laid on the surface of the bonding gap of the skin 1 to form a skin / base adhesive film system. The entire skin / base adhesive film system is sealed in a vacuum bag, the vacuum bag is evacuated, and then placed in an oven or autoclave and heated to 60°C for compaction, so that the base adhesive film 2 and the skin 1 are tightly bonded together.

[0094] In this embodiment, the base adhesive film 2 is compacted to lay the test adhesive dots 3. After the fit relationship of the fit gap is checked and found to be qualified, the base adhesive film 2 can be retained on the surface of the skin 1 for the bonding treatment between the skin 1 and the reinforcing rib 4.

[0095] In this embodiment, the density of the adhesive dots 3 on the plane of the mating gap is 100 pcs / m. 2 The laying density on the curved surface of the mating gap is 200 pcs / m 2 The size of the glue dots detected was 1cm. 2 ;

[0096] Among them, the detection adhesive dots 3 are evenly laid on the surface of the base film 2 away from the skin 1. The detection adhesive dots 3 are made of the same material as the base film 2, and the thickness of the detection adhesive dots 3 is the same as the thickness of the base film 2 after compaction.

[0097] In this embodiment, the surface of the adhesive fit gap between the skin 1 and the reinforcing rib 4 includes a plane and a curved surface, wherein the compensation area 7 where the fit relationship between the skin 1 and the reinforcing rib 4 does not meet the fit gap is located on the curved surface.

[0098] In some instances, the materials of the detection adhesive dots 3 and the base adhesive film 2 are bismaleimide structural adhesive or epoxy resin structural adhesive; in this embodiment, the materials of the detection adhesive dots 3 and the base adhesive film 2 are bismaleimide J-299 adhesive film.

[0099] S2. Based on the fit relationship of the fit clearance, place the reinforcing rib 4 on the skin 1, and apply the test pressure from the reinforcing rib 4 toward the skin 1.

[0100] The reinforcing rib 4 includes a reinforcing rib blank and a reinforcing rib forming mold. The reinforcing rib blank is wrapped around the outside of the reinforcing rib forming mold. The reinforcing rib blank is not cured, so that the bonding force between the reinforcing rib blank and the test adhesive point 6 is greater than the bonding force between the test adhesive point 6 and the base adhesive film 2.

[0101] The application of the testing pressure is as follows: the skin 1 is fixed, and the testing pressure is applied from the reinforcing rib 4 toward the skin 1 according to the fit relationship of the mating clearance; specifically, the testing pressure is 15 kPa.

[0102] In this embodiment, the magnitude of the detection pressure depends on the material of the test adhesive point 6. When the material of the test adhesive point 6 is smear J-299 adhesive film, the detection pressure is 15 kPa. Using this detection pressure, the test adhesive point 3 in the area where the fit gap between the skin 1 and the reinforcing rib 4 meets the fit relationship can fully contact the reinforcing rib 4. When the fit relationship between the skin 1 and the reinforcing rib 4 is not met in some areas, the test adhesive point 3 cannot contact the reinforcing rib 4. When the reinforcing rib 4 is separated from the skin 1, the test adhesive point 3 that is fully in contact with the reinforcing rib 4 is transferred to the surface of the reinforcing rib 4, while the test adhesive point 3 that is not in contact with the reinforcing rib 4 is not transferred.

[0103] Therefore, by checking whether the test glue point 3 is completely transferred to the surface of the reinforcing rib 4, it can be determined whether the fit relationship between the skin 1 and the reinforcing rib 4 meets the requirements. Only when the test glue point 6 is completely transferred to the reinforcing rib 4 in one inspection process does it indicate that the fit relationship between the skin 1 and the reinforcing rib 4 meets the requirements.

[0104] The detection pressure here refers to the pressure exerted by the reinforcing rib 4 on the detection adhesive point 3 when the detection adhesive point 3 is in full contact with the surface of the reinforcing rib 4.

[0105] In some instances, when applying the testing pressure, opposite forces can be applied to the skin 1 and the reinforcing rib 4 simultaneously, so that the skin 1 and the reinforcing rib 4 tend to move closer to each other, thereby forming the testing pressure.

[0106] S3. Separate the reinforcing rib 4 and the skin 1, and check whether the detection adhesive dots 3 have all been transferred from the surface of the skin 1 to the surface of the reinforcing rib 4.

[0107] In this process, the reinforcing rib 4 and the skin 1 are separated. When the skin 1 is fixed, a force opposite to the detection pressure is applied to the reinforcing rib 4, causing the reinforcing rib 4 and the skin 1 to move away from each other.

[0108] In this embodiment, the reinforcing rib blank of the reinforcing rib 4 is not cured. Its adhesion to the detection adhesive point 3 is stronger than the adhesion between the detection adhesive point 3 and the base adhesive film 2. When the reinforcing rib 4 is separated from the skin 1, the detection adhesive point 3 is transferred to the surface of the reinforcing rib blank, which is the transferred detection adhesive point 302.

[0109] When the clearance fit between the skin 1 and the reinforcing rib 4 does not meet the fit relationship, the reinforcing rib blank of the reinforcing rib 4 cannot effectively contact the detection adhesive point 3. The adhesion between the detection adhesive point 3 and the reinforcing rib 4 that cannot effectively contact is less than the adhesion between the detection adhesive point 3 and the base adhesive film 2. After the skin 1 and the reinforcing rib 4 separate, the detection adhesive point 3 cannot be transferred to the reinforcing rib blank of the reinforcing rib 4, which is the untransferred detection adhesive point 301.

[0110] Therefore, by checking whether all the adhesive dots 3 have been transferred from the surface of the skin 1 to the surface of the reinforcing rib 4, the fit relationship between the skin 1 and the reinforcing rib 4 can be determined.

[0111] In this embodiment, when untransferred detection adhesive dots 301 are found on the surface of the skin 1, the compensation area 7 that does not meet the fit relationship is determined according to the location of the untransferred detection adhesive dots 301; the compensation area 7 is compensated and repaired, and the process returns to the step of placing the reinforcing rib 4 on the skin 1 according to the fit relationship of the fit gap, and applying detection pressure from the reinforcing rib 4 toward the skin 1 until all the detection adhesive dots 3 are transferred from the surface of the skin 1 to the surface of the reinforcing rib 4.

[0112] In this embodiment, the step of determining the compensation region 7 that does not meet the fit relationship based on the location of the untransferred detection adhesive dots 301 includes: forming a test region 5 with the sitting position of the untransferred detection adhesive dots 301 on the skin 1 as the center and R as the radius; removing the untransferred detection adhesive dots 301 and the transferred detection adhesive dots 302, and laying test adhesive dots 6 on the surface of the test region 5; placing the reinforcing rib 4 on the skin 1 again according to the fit relationship of the fit gap, and applying test pressure from the reinforcing rib 4 toward the skin 1; wherein the test pressure is the same as the detection pressure; separating the reinforcing rib 4 and the skin 1, and determining the area in the test region 5 where the untransferred test adhesive dots 601 are distributed, which is the compensation region 7;

[0113] The radius R is determined based on the untransferred detection adhesive dots 301 on the skin 1. The test area 5 is the area covered by a circle with radius R centered on the location of the untransferred detection adhesive dots 301.

[0114] When all other adjacent detection adhesive dots 3 of the untransferred detection adhesive dot 301 are transferred to the surface of the reinforcing rib 4, find the detection adhesive dot 3 that is furthest from the untransferred detection adhesive dot 301. The distance between the furthest adjacent detection adhesive dot 3 and the untransferred detection adhesive dot 301 is R.

[0115] When there are multiple untransferred test adhesive dots 301 on the skin 1, first determine the center of the area as the center of the circle, and then find the transfer test adhesive dot 3 that is farthest from the center and adjacent to the area. The distance between the two is R; the size of the test adhesive dot 6 is 0.5cm2.

[0116] The test adhesive dots 6 on the surface of skin 1 are partially transferred to the surface of reinforcing rib 4, which are the transferred test adhesive dots 602; the test adhesive dots 6 remaining on the surface of skin 1 indicate that the test adhesive dots 601 have not been transferred, and the area formed is the compensation area 7.

[0117] In this embodiment, the test adhesive dots 6 are fully laid on the surface of the test area 5, and there is no interference between adjacent test adhesive dots 6; no interference between adjacent test adhesive dots 6 means that there is no adhesive connection between adjacent test adhesive dots 6.

[0118] In this embodiment, the steps for compensating and repairing the surface of the skin 1 corresponding to the compensation area 7 include: cutting a compensation film 8 identical to the compensation area 7 according to the shape of the compensation area 7; laying the compensation film 8 on the surface of the skin 1 corresponding to the compensation area 7; heat-treating the compensation film 8 to ensure it adheres firmly, thus completing the compensation and repair; wherein, the shape and size of the compensation film 8 are the same as the shape and size of the compensation area 7, and the cut compensation film 8 is laid on the compensation area 7 on the surface of the base film 2 in a non-discriminatory manner;

[0119] The steps for heat-treating and firmly attaching the compensating adhesive film 8 include: after the compensating adhesive film 8 is laid, using an iron to iron the compensating adhesive film 8 firmly, with the temperature of the iron being less than 60℃;

[0120] When multiple non-adjacent untransferred detection adhesive dots 301 appear between the skin 1 and the reinforcing rib 4, or when multiple areas formed by multiple untransferred detection adhesive dots 301 appear, it indicates that there is a corresponding amount of compensation between the skin and the reinforcing rib. All compensation areas 7 need to be repaired before a re-inspection.

[0121] In this embodiment, the re-inspection method is the same as the inspection method, except that: before the re-inspection, all the test adhesive dots 3 or test adhesive dots 6 on the surface of the skin 1 and the reinforcing rib 4 are removed, and then the test adhesive dots 3 are re-laid on the surface of the skin 1. According to the fit relationship of the fit gap, the reinforcing rib 4 is placed on the skin 1, and the test pressure is applied from the reinforcing rib 4 toward the skin 1 until all the test adhesive dots 3 are transferred from the surface of the skin 1 to the surface of the reinforcing rib 4, that is, the re-inspection is qualified.

[0122] During the re-inspection, the density of the newly laid test adhesive dots 3 can be the same as or different from that of the previously laid test adhesive dots 3, but the position of the newly laid dots during the re-inspection is adjusted to be staggered relative to the previous position; it is understood that in this embodiment, the distribution of the test adhesive dots 3 can be in a square array.

[0123] S4. When all the test adhesive dots 3 have been transferred from the surface of the skin 1 to the surface of the reinforcing rib 4, it indicates that the fit clearance between the skin 1 and the reinforcing rib 4 meets the requirements of the fit relationship, and the inspection is completed.

[0124] In some instances, the position of the detection glue point 3 is adjusted when the steps are repeated for multiple checks.

[0125] In some instances, during a review or inspection, if the skin 1 separates from the reinforcing rib 4 and the detection adhesive dots 3 are transferred, and if the base adhesive film 2 detaches from the surface of the skin 1 under the action of the detection adhesive dots 3, the base adhesive film 2 should be re-compacted or removed and then a new base adhesive film 2 should be re-compacted, and the surface of the skin 1 should be roughened again.

[0126] S5. After the gap inspection is completed and qualified, the skin 1 and the reinforcing rib 4 are glued together according to the fit relationship of the glued gap.

[0127] The above description is only a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A method for inspecting the internal fit gaps of large-area adhesive bonding, characterized in that, The inspection method is used to inspect the fit clearance between the skin and the reinforcing rib, and includes the following steps: The skin is surface-treated, and test adhesive dots are laid on the surface of the surface-treated skin; the density of the test adhesive dots is 100-400 pcs / m. 2 The material of the detected adhesive dots is bismaleimide J-299 adhesive film; Based on the fit relationship of the aforementioned fit clearance, the reinforcing rib is placed on the skin, and a detection pressure is applied from the reinforcing rib toward the skin; the detection pressure is 10-20 kPa. Separate the reinforcing rib from the skin. When untransferred detection adhesive dots are found on the surface of the skin, a test area is formed with the location of the untransferred detection adhesive dots as the center and R as the radius. Remove the test adhesive dots and then lay test adhesive dots on the surface of the test area; wherein the test adhesive dots cover the entire surface of the test area, and there is no interference between adjacent test adhesive dots, and the size of the test adhesive dots is 0.5-2 cm. 2 ; Based on the fit relationship of the aforementioned fit clearance, the reinforcing rib is placed on the skin, and a test pressure is applied from the reinforcing rib toward the skin; wherein, the test pressure is the same as the detection pressure; Separate the reinforcing rib and the skin again to determine the area where the test adhesive dots that have not been transferred are distributed within the test area, which is the compensation area; The compensation area is repaired and then the process is repeated, following the steps of placing the reinforcing rib on the skin according to the fit relationship of the fit gap, and applying detection pressure from the reinforcing rib toward the skin until all the detection adhesive dots are transferred from the skin surface to the reinforcing rib surface.

2. The method for inspecting the internal fit gap of a large-area adhesive bond according to claim 1, characterized in that, The steps for compensating and repairing the compensation area include: Based on the shape of the compensation area, a compensation film identical to the compensation area is cut; The compensation film is laid on the skin surface corresponding to the compensation area; The compensating adhesive film is heat-treated to ensure it adheres properly.

3. The method for inspecting the internal fit gap of a large-area adhesive bond according to claim 1, characterized in that, The surface treatment steps include: The surface of the skin is roughened; A base adhesive film is laid on the surface of the skin after surface roughening treatment, and the base adhesive film is compacted.

4. The method for inspecting the internal fit gap of a large-area adhesive bond according to claim 3, characterized in that, The compaction process was carried out under full vacuum conditions at 60°C.

5. The method for inspecting the internal fit gap of a large-area adhesive bond according to claim 4, characterized in that, The thickness of the base adhesive film after compaction is the same as the thickness of the test adhesive point.

Images