Multi-specification rivet surface size rapid detection device and method

Abstract

The invention provides a multi-specification rivet surface size rapid detection device and method, the device is formed by attaching and fixing a go end side and a no-go end side which are consistent in appearance size, rectangular grooves of different sizes are formed in four sides so as to be suitable for rivets of different specifications, and the rectangular grooves are the same in position and consistent in axis, but different in notch size. The widths of the notches of the rectangular grooves in the go end side and the not-go end side are equal to the maximum diameter and the minimum diameter allowed by the rivet upset head respectively, if the upset head can horizontally pass through the rectangular grooves in the go end side but cannot pass through the rectangular grooves in the not-go end side, the diameter of the upset head meets the requirements for the maximum diameter and the minimum diameter, and the purpose of checking and accepting the maximum diameter and the minimum diameter of the rivet upset head at a time is achieved. The device is light in weight, low in cost and convenient to use, and the time for carrying out graded acceptance check on rivet clamping plate selection and left-right overturning is shortened in the aspect of acceptance check efficiency.

Description

Technical Field

[0001] This invention belongs to the field of aerospace manufacturing technology and relates to a device and method for rapid detection of the surface dimensions of multi-specification rivets. It is a detection device used to quickly inspect the installation quality of rivets after the rivet head is formed. Background Technology

[0002] In the assembly of aircraft components, a large number of rivets are used to connect the parts together. As a primary connection method, the quality of riveting is a key indicator for evaluating the effectiveness of the riveting process, directly affecting the structural strength, safety, and service life of the product. In current practice, due to limitations such as structural space, aircraft riveting methods are limited and lack automation. It is generally done manually by two people using a rivet gun with hammering force. In some open areas, press riveting machines or automated equipment are used. During the rivet forming process, the rivet is subjected to a certain impact force or the pressure of the press riveting machine, causing the rivet shank to thicken within the rivet hole, thus forming an interference fit connection. Finally, an upset head is formed at the rivet shank. This method has advantages such as reliable connection, low cost, wide application range, and lower requirements for hole precision compared to bolted connections. However, during the riveting process, different riveting methods, such as forward riveting and reverse riveting, operators with different skill levels, and adhesive joints can all lead to different riveting results, making it impossible to guarantee the consistency of the quality of the upset head after riveting. In the rivet quality acceptance process, the forming quality of the upset head is a key acceptance point, which directly affects the reliability of the rivet connection. In the current aviation technical standards, the upset head after riveting must ensure that the shape of the upset head is drum-shaped, and wedge-shaped or horseshoe-shaped is not allowed. At the same time, the maximum diameter, minimum diameter, and forming height of the upset head must meet the dimensional tolerances and relevant standards.

[0003] The current acceptance method combines visual inspection with rivet clamps. The rivet clamps used are of a single type and have low integration of functions for multiple specifications. Each rivet of the same diameter corresponds to one rivet clamp. One side of the rivet clamp controls the maximum diameter of the rivet head (for the through end, the maximum diameter of the rivet head must not exceed that of the rivet clamp), and the other side controls the minimum diameter of the rivet head (for the stop end, the minimum diameter of the rivet head must not be less than that of the rivet clamp). Inspecting one rivet head requires using the rivet clamp in both directions, which is inefficient and requires personnel to perform at least two manual operations. Meanwhile, due to the complexity of aircraft structures, the diameter and specifications of rivets used on components are irregular, and multiple rivet specifications may appear in the same part. Each time an acceptance test is conducted, a different rivet clasp of different specifications must be replaced, which further increases the inconvenience of using rivet clasp during the acceptance process. It also has the disadvantage of being unable to inspect certain structurally restricted parts, resulting in low acceptance efficiency and operational inconvenience. In addition, rivet clasps are a type of specialized inspection equipment. In the tool management of the production process, the large number and wide use of rivet clasps lead to a high frequency of scheduled inspections, which also increases certain labor costs. Summary of the Invention

[0004] To address the acceptance process of upset heads after rivet installation, this invention provides a rapid inspection device and method for the surface dimensions of multi-specification rivets. This improves upon the inconvenience of selecting and using rivet clamps, integrating the through-end and stop-end inspection functions of the clamp. This allows for simultaneous inspection of the maximum and minimum diameter dimensions of the upset rivet head, making it convenient and efficient. Furthermore, one clamp can inspect at least four rivet sizes, reducing tool management difficulties and significantly increasing the inspection speed of rivet installation quality in practical applications.

[0005] The present invention adopts the following technical solution:

[0006] A rapid surface dimension detection device for multi-specification rivets comprises a through end side 1 and a stop end side 2 with identical external dimensions, which are fitted and fixed together. Rectangular grooves are formed at the edges of the two sides. The rectangular grooves are in the same position and have the same axis, but the groove openings are different. The width of the rectangular groove opening on the through end side 1 is equal to the maximum diameter allowed by the rivet upsetting head, and the width of the rectangular groove opening on the stop end side 2 is equal to the minimum diameter allowed by the rivet upsetting head. If the upsetting head can pass horizontally through the rectangular groove of the through end side 1 but cannot pass through the rectangular groove of the stop end side 2, then its diameter meets the maximum and minimum diameter requirements.

[0007] The through end side 1 is a square plate structure, with a rectangular groove in the middle of each side. The width of the groove is equal to the maximum diameter allowed by the rivet head. The four rectangular grooves have different widths, corresponding to four different rivet specifications. If the rivet head can pass horizontally through the corresponding rectangular groove, the maximum diameter requirement is met. The four corners of the through end side 1 are each made of square right-angle notches 8. The size of the notches 8 is set according to the height requirement of the rivet head. The size of the four notches 8 corresponds to the four different rivet specifications, and is the same as the rivet specifications corresponding to the four rectangular grooves. The rectangular grooves of the same specification are adjacent to the notches 8. If the notch 8 cannot enter the rivet head, it means that the rivet head height is qualified. The through end side 1 has two fixing holes 4 in the middle for fixed connection with the stop end side 2.

[0008] The dimensions and structure of the stop end side 2 and the through end side 1 are basically the same. They also have rectangular grooves, notches 8, and two fixing holes 4 at the same position. The difference lies in the thickness and the width of the rectangular groove opening. The width of the rectangular groove opening of the stop end side 2 is equal to the minimum diameter allowed by the corresponding specification of the rivet head. If the head cannot pass horizontally through the rectangular groove of the corresponding specification, then the minimum diameter requirement is met. The through end side 1 and the stop end side 2 are locked together by fastening device 3 through the fixing holes 4. Rivets or screws can be used. After the two are fixedly connected, they fit tightly together so that the end faces of the notches 8 are flush. Each rectangular groove of the two corresponds to the same specification of rivet, and the groove axis is consistent. If the rivet head can pass horizontally through the rectangular groove of the through end side 1 but cannot pass through the rectangular groove of the stop end side 2, it means that it meets both the maximum diameter and minimum diameter requirements at the same time, realizing the detection of the maximum and minimum diameter in one step.

[0009] To prevent misuse, specification markings 9 are provided between each pair of rectangular slots and notches 8 of the same specification on the surface of the through end 1, so as to facilitate correct and quick selection during use.

[0010] Both the through end 1 and the stop end 2 have connector holes 5 at the same position for connecting the extended adapter rod 7 via the rotating shaft 6. The extended adapter rod 7 is made of a U-shaped hard metal strip with holes of the same size and precision as the connector holes 5 at its end. It is clamped at the connector holes 5 on the outside of the through end 1 and the stop end 2 and connected via the rotating shaft 6. This facilitates the use of the rapid testing device in confined spaces. The length of the extended adapter rod 7 can be selected according to the product structure. The rotating shaft 6 is made of bolts and has a clearance fit with the connector holes of the adapter rod.

[0011] A rapid detection method for the surface dimensions of multi-specification rivets, based on the aforementioned rapid detection device, includes the following steps:

[0012] Step 1: Select the corresponding inspection area for the assembled rapid inspection device according to the specifications of the rivets to be inspected, and check the markings to ensure they are correct. For narrow areas, an extension rod 7 of appropriate length can be selected according to the characteristics of the aircraft structure. Install the extension rod 7 and the rotating shaft 6 in the connector hole 5 to ensure that the corresponding area can be inspected after installation. At the same time, before use, ensure that the rapid inspection device rotates flexibly and there is no risk of falling off or being lost.

[0013] Step 2: Slightly contact the end face of the rapid testing device with the skin where the rivet upsetting head is located on the aircraft structural component. Select a suitable direction and horizontally pass the through end 1 through the rivet upsetting head to be inspected. The maximum diameter of the upsetting head should enter the rectangular port of the through end 1. If the rivet upsetting head passes through smoothly, the maximum diameter of the rivet upsetting head meets the requirements and is not too large; otherwise, it does not meet the requirements. When the upsetting head enters halfway, it contacts the stop end 2. If the rivet upsetting head cannot pass through smoothly, that is, the rivet upsetting head stops the rapid testing device, the minimum diameter of the rivet upsetting head meets the requirements; otherwise, it does not meet the requirements. This achieves the purpose of inspecting the maximum and minimum diameters of the rivet upsetting head in one go.

[0014] Step 3: The notch 8 of the corresponding specification of the rapid testing device is attached to the skin of the structural component where the rivet head is located. Apply slight force and observe whether there is a gap between the upper end face of the notch 8 and the surface of the rivet head. If the notch 8 cannot enter the rivet head, it means that the height of the rivet head is qualified. If there is a gap between it and the rivet head, the height of the rivet head is too small and unqualified.

[0015] Step 4: After completing the acceptance of a rivet, visually inspect it for mechanical damage or other defects. If it passes inspection, proceed to Step 2 and Step 3 for the next rivet. To save time, after the head quality of rivets of the same specification is completed, the acceptance of the next specification of rivets will be carried out.

[0016] The beneficial effects of this invention are as follows: By using a novel combined riveting quality inspection device, one set of riveting chucks can integrate the functions of four sets of rivet chucks. It is lightweight, low-cost, and easy to use, significantly reducing the time spent on selecting rivet chucks and performing multiple inspections by flipping them left and right. Through simulation comparison, this invention can improve inspection efficiency by more than three times, while maintaining a consistent pass rate compared to previous methods, ensuring that the acceptance quality meets relevant technical requirements. Regarding tool management, rivet chucks, as dedicated inspection equipment for inspectors, require conformity verification by a metrology institution every six months. This invention integrates the original four dedicated inspection devices into one, reducing the number of scheduled inspections for dedicated equipment and simultaneously lowering management complexity. This results in cost savings in terms of time and management, achieving the goal of improving quality and efficiency. Attached Figure Description

[0017] Figure 1This is a schematic diagram of a rapid detection device, where (a) is the front view and (b) is a side sectional view.

[0018] Figure 2 The diagrams show the rotating shaft and the extended adapter rod, where (a) is a schematic diagram of the rotating shaft and (b) is a schematic diagram of the extended adapter rod.

[0019] Figure 3 This is a magnified view of a section of the rectangular groove;

[0020] Figure 4 This is a schematic diagram for measuring the diameter of the pier head.

[0021] Figure 5 This is a cross-sectional view of the pier head diameter detection.

[0022] Figure 6 This is a schematic diagram for measuring the height of the pier head.

[0023] Figure 7 This is an enlarged view of the pier head height measurement.

[0024] Figure 8 This is a schematic diagram of the extended adapter rod connection.

[0025] In the diagram: 1. Through end side; 2. Stop end side 2; 3. Fastening device; 4. Fixing hole; 5. Connector hole; 6. Shaft; 7. Extended adapter rod; 8. Notch; 9. Specification markings. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] A rapid detection device for the surface dimensions of multi-specification rivets includes a through end side 1 and a stop end side 2, such as Figure 1 and Figure 3 .

[0028] The through end side 1 is a square plate structure, with a rectangular groove in the middle of each side. The width of the groove is equal to the maximum diameter allowed by the rivet head. The four rectangular grooves have different widths, corresponding to four different rivet specifications. If the rivet head can pass horizontally through the corresponding rectangular groove, the maximum diameter requirement is met. The thickness of the through end side 1 is flexibly selected according to the maximum acceptance rivet diameter allowed by the part and technical specifications, but it should not be too large to ensure operational flexibility. The external dimensions are 30mm × 30mm. If the rivet diameter is larger, this dimension can be appropriately increased (increasing the dimension ensures the reliability and stability of the device). The minimum thickness must not be less than the maximum allowable rivet head radius after forming to prevent false inspections due to the material being too thin at the through end. Square right-angle notches 8 are made at the four corners of the through end side 1. The size of the notches 8 is set according to the rivet head height requirements. The four notches 8 correspond to four different rivet specifications, and the rivet specifications are the same as those corresponding to the four rectangular slots. The rectangular slots of the same specification are adjacent to the notches 8. If the notch 8 cannot enter the rivet head, it indicates that the rivet head height is qualified. Two fixing holes 4 are provided in the middle of the through end side 1 for fixed connection with the stop end side 2.

[0029] The dimensions and structure of the stop end side 2 and the through end side 1 are basically the same. They also have rectangular grooves, notches 8, and two fixing holes 4 at the same position. The difference lies in the thickness and the width of the rectangular groove opening. The width of the rectangular groove opening of the stop end side 2 is equal to the minimum diameter allowed by the corresponding specification of the rivet head. If the head cannot pass horizontally through the rectangular groove of the corresponding specification, then the minimum diameter requirement is met. The through end side 1 and the stop end side 2 are locked together by fastening device 3 through the fixing holes 4. Rivets or screws can be used. After the two are fixedly connected, they fit tightly together so that the end faces of the notches 8 are flush. Each rectangular groove of the two corresponds to the same specification of rivet, and the groove axis is consistent. If the rivet head can pass horizontally through the rectangular groove of the through end side 1 but cannot pass through the rectangular groove of the stop end side 2, it means that it meets both the maximum diameter and minimum diameter requirements at the same time, realizing the detection of the maximum and minimum diameter in one step. The dimensions of the stop end side 2 are the same as those of the through end side 1, which are 30mm × 30mm. If the rivet size is large, this dimension can be increased appropriately, but it must be ensured that it is consistent with the dimensions of the through end side 1. The material thickness is selected to be approximately 2mm. If a material with higher hardness is selected, the thickness can be reduced to 1mm. Considering that different materials may have a shorter service life due to potential corrosion, the stop end side 2 is made of the same material as the through end side 1.

[0030] The fixing hole 4 has a diameter of 3mm. The fastening device 3 is sized to match the fixing hole and uses bolts or rivets with self-locking function to ensure connection quality. After connection via fastening device 3, the through end 1 and the stop end 2 fit tightly without debris or gaps, and the connection is reliable and stable. To ensure the reliability of fastening during later use, single-hole fastening is prohibited. At least two fastening connections are required, namely two sets of fixing holes 4 and fastening devices 3, to avoid loosening due to single-hole connection during use and resulting in incorrect acceptance. To increase practicality and aesthetics, countersunk standard parts can be used for fastening. Note that when countersunk, the through end side should be selected as the countersunk surface to ensure structural stability.

[0031] To prevent misuse, specification markings 9 are provided between each pair of rectangular slots and notches 8 of the same specification on the surface of the through end 1. This facilitates correct and quick selection during use. The specification markings 9 are laser-printed and should be close to the detection part, clear, accurate, and easy to identify. Operators should check them before use to prevent misuse.

[0032] Both the through end side 1 and the stop end side 2 have connector holes 5 at the same position for connecting the extended adapter rod 7 (e.g., via the rotating shaft 6) Figure 2 The position of the extended adapter rod 7 can be adjusted according to the actual situation. The extended adapter rod 7 is made of a U-shaped hard metal strip with holes at its end that are the same size and precision as the connector hole 5. It is clamped at the connector hole 5 on the outside of the through end side 1 and the stop end side 2, and connected via a rotating shaft 6. This facilitates the use of the rapid testing device in confined spaces. The length of the extended adapter rod 7 can be selected according to the product structure. The rotating shaft 6 uses bolts, with a clearance fit to the connector hole of the adapter rod, allowing for flexible rotation of the rapid testing device and the extended adapter rod 7. After assembly, the rapid testing device can inspect parts that are difficult to inspect manually. The connector hole 5 must meet a precision of H9 or higher.

[0033] A rapid detection method for the surface dimensions of multi-specification rivets, based on the aforementioned rapid detection device, includes the following steps:

[0034] Step 1: Select the corresponding inspection area for the assembled rapid inspection device according to the specifications of the rivets to be inspected, and check the markings to ensure they are correct. For narrow areas, an extension rod 7 of appropriate length can be selected according to the characteristics of the aircraft structure. Install the extension rod 7 and the rotating shaft 6 in the connector hole 5 to ensure that the corresponding area can be inspected after installation. At the same time, before use, ensure that the rapid inspection device rotates flexibly and there is no risk of falling off or being lost.

[0035] Step 2: Slightly contact the end face of the rapid testing device with the skin containing the rivet upsetting head on the aircraft structural component. Select a suitable direction and horizontally pass the through end 1 through the rivet upsetting head being inspected. The maximum diameter of the upsetting head should enter the rectangular port of the through end 1. If the rivet upsetting head passes smoothly, the maximum diameter of the rivet upsetting head meets the requirements and is not too large; otherwise, it does not meet the requirements. When the upsetting head is halfway in, it contacts the stop end 2. If the rivet upsetting head cannot pass smoothly, i.e., the rivet upsetting head stops the rapid testing device, the minimum diameter of the rivet upsetting head meets the requirements; otherwise, it does not meet the requirements. This achieves the purpose of inspecting the maximum and minimum diameters of the rivet upsetting head in one step. Figure 4 and Figure 5 .

[0036] Step 3: The notch 8 of the corresponding specification of the rapid testing device is attached to the skin of the structural component where the rivet head is located. Apply slight force and observe whether there is a gap between the upper surface of the notch 8 and the surface of the rivet head. If the notch 8 cannot enter the rivet head, it indicates that the rivet head height is qualified. If there is a gap, the rivet head height is too small and unqualified. Figure 6 and Figure 7 .

[0037] Step 4: After completing the acceptance of a rivet, visually inspect it for mechanical damage or other defects. If it passes inspection, proceed to Step 2 and Step 3 for the next rivet. To save time, after the head quality of rivets of the same specification is completed, the acceptance of the next specification of rivets will be carried out.

[0038] The above description is only a partial embodiment of the present invention and does not limit the implementation and protection scope of the present invention. Any improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the present invention should be within the protection scope of the present invention.

Claims

1. A rapid detection device for the surface dimensions of multi-specification rivets, characterized in that, It is formed by fitting and fixing the through end side (1) and the stop end side (2) with the same external dimensions. A rectangular groove is made at the edge. The rectangular grooves of the two are in the same position and have the same axis, but the groove openings are different. The width of the rectangular groove openings on the through end side (1) and the stop end side (2) is equal to the maximum and minimum diameters allowed by the rivet head, respectively. If the rivet head can pass horizontally through the rectangular groove of the through end side (1) but cannot pass through the rectangular groove of the stop end side (2), then its diameter meets the requirements of the maximum and minimum diameters.

2. The rapid detection device for the surface dimensions of multi-specification rivets according to claim 1, characterized in that, Both the through end side (1) and the stop end side (2) are square plate structures, and rectangular grooves are made on all four sides of both. The groove openings of each set of rectangular grooves are different to accommodate rivets of different specifications.

3. A rapid detection device for the surface dimensions of multi-specification rivets according to claim 1 or 2, characterized in that, The thickness of the through end side (1) shall not be less than the maximum radius allowed by the corresponding specification of the rivet head.

4. The rapid detection device for the surface dimensions of multi-specification rivets according to claim 2, characterized in that, Specification markings (9) are provided next to the rectangular groove on the through end side (1) to indicate the corresponding rivet specifications and dimensions.

5. The rapid detection device for the surface dimensions of multi-specification rivets according to claim 2, characterized in that, Two fixing holes (4) are made on both the through end side (1) and the stop end side (2), which are locked by a fastening device (3).

6. The rapid detection device for the surface dimensions of multi-specification rivets according to claim 2, characterized in that, Square right-angle notches (8) are made at the four corners of the through end side (1) and the stop end side (2). The four notches (8) are different in size and are set according to the head height requirements of four different specifications of rivets.

7. The rapid detection device for the surface dimensions of multi-specification rivets according to claim 6, characterized in that, The four notches (8) have the same rivet specifications as the four sets of rectangular slots on the rapid detection device, and the rectangular slots of the same specifications are adjacent to the notches (8).

8. The rapid detection device for the surface dimensions of multi-specification rivets according to claim 1, characterized in that, Connector holes (5) are made at the same position on the through end side (1) and the stop end side (2), and an extended adapter rod (7) is connected through a rotating shaft (6) so that the rapid detection device can be used in a confined space.

9. A method for rapid detection of the surface dimensions of multi-specification rivets, used based on the rapid detection device for the surface dimensions of multi-specification rivets according to any one of claims 1-8, characterized in that, Includes the following steps: Step 1: Select the corresponding inspection area for the assembled rapid inspection device according to the specifications of the rivets to be inspected; Step 2: Place the end face of the rapid testing device in contact with the skin where the rivet upsetting head is located, and pass the through end side (1) horizontally through the rivet upsetting head to be inspected. The maximum diameter of the upsetting head enters into the rectangular port of the through end side (1). If the rivet upsetting head passes through smoothly, the maximum diameter of the rivet upsetting head meets the requirements; otherwise, it does not meet the requirements. When the rivet upsetting head enters halfway, it contacts the stop end side (2). If the rivet upsetting head cannot pass through, the minimum diameter of the rivet upsetting head meets the requirements; otherwise, it does not meet the requirements. Step 3: The notch (8) of the corresponding specification of the rapid detection device is attached to the skin of the structural component where the rivet head is located. If the notch (8) cannot enter the rivet head, it means that the height of the rivet head is qualified. If there is a gap between the notch (8) and the rivet head, the height of the rivet head is unqualified. Step 4: After completing the acceptance of a rivet, visually inspect it for any other defects. If it passes inspection, proceed to Step 2 and Step 3 for the next rivet.

10. A method for rapid detection of surface dimensions of multi-specification rivets according to claim 9, characterized in that, For narrow areas, select an extension rod (7) of appropriate length and install it in the connector hole (5).

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