Dimple limiter and depth-adjustable small-space reverse dimple method

Abstract

The invention belongs to the technical field of small-space dimpling of airplanes, and discloses a dimpling limiter and a depth-adjustable small-space reverse dimpling method. According to the dimple limiting stopper, a rotating shaft is installed between two deep groove ball bearings and matched with a groove of the rotating shaft through a limiting screw to limit front-back movement of the rotating shaft; the rotating shaft extends out of the nut, the movable sleeve, the nut and the lining limit the positions of the two deep groove ball bearings, the limiting sleeve and the lining limit the position of the spring, the combiner is pressed on the spring, the rotating shaft moves up and down through elastic force of the spring, and the adjusting nut is connected with threads on the movable sleeve through threads. And the adjusting nut is meshed with sawteeth of the combiner, so that the movement range of the dimple limiter is limited.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of aircraft small space counterbore, and particularly relates to a counterbore limiter and a depth-adjustable small space reverse counterbore method. BACKGROUND

[0002] Due to continuous progress of aircraft design, the proportion of composite materials in aircraft structures continues to rise, the design complexity increases, various special-shaped components, inserts and complex connection structures appear, and the traditional hole making process faces many restrictions. Many narrow working conditions that conventional counterbore tools cannot enter appear, and these hole making conditions seriously restrict the production and delivery progress of the aircraft. A low-cost, high-efficiency and highly adaptable small space counterbore method is urgently needed.

[0003] In order to overcome the above problems, a counterbore tool is needed, which can adapt to ordinary gun type air drills, is compact in structure, adjustable in counterbore depth, and can realize counterbore requirements of different hole diameters and depths by replacing different counterbore drills, so as to meet the small space counterbore requirements of special-shaped components, inserts and complex connection structures while ensuring the counterbore accuracy of products. SUMMARY

[0004] The technical problem to be solved by the application is that the application aims to provide a counterbore limiter and a depth-adjustable small space reverse counterbore method to meet the counterbore requirements in narrow spaces in the aircraft machining process. The device not only meets the counterbore hole making function, but also meets the requirements of compact tool design in narrow spaces, adjustable depth, stable operation, wide applicability and economy. The technical scheme of the application is: In a first aspect, the application provides a counterbore limiter, which comprises: a limiting sleeve 1, a movable sleeve 2, a combination 3, an adjusting nut 4, a rotating shaft 5, a nut 6, a bearing 7, a bushing 8, a spring 9 and a limiting screw 10. The rotating shaft 5 is installed between the two deep groove ball bearings 7 and is limited in forward and backward movement by a limiting screw 10 matched with a groove of the rotating shaft 5. The rotating shaft 5 extends out of the nut 6, and the movable sleeve 2, the nut 6 and the bushing 8 limit the positions of the two deep groove ball bearings 7. The limiting sleeve 1 and the bushing 8 limit the position of the spring 9. The combination 3 is pressed on the spring 9, and the up and down movement of the rotating shaft 5 is realized by the elastic force of the spring 9. The adjusting nut 4 is connected with the thread on the movable sleeve 2 through thread, and the adjusting nut 4 is meshed with the sawtooth of the combination 3 to limit the movement range of the counterbore limiter.

[0005] Further, the combination 3 is provided with a downward bending part of 2mm wide, which is matched with a limiting groove on the movable sleeve 2 to make the combination 3 only move up and down along the limiting groove. The thread area of the movable sleeve 2 is provided with a scale line to display the current adjustment position.

[0006] Further, the nylon sleeve 11 is arranged on the workpiece connecting part of the counterbore limiter, the nylon sleeve 11 is connected with the limiting sleeve 1 through threads, and the counterbore limiter is prevented from scratching the surface of the workpiece.

[0007] Further, when the counterbore drill is installed, the rotating shaft 5 is fixed through a wrench, the counterbore drill thread is ensured to be connected with the rotating shaft 5, and the nut 6 is connected with the rotating shaft 5 through threads.

[0008] Further, the blade part of the counterbore drill 13 is designed as a mirror image, so that the cutter can normally drill holes when being reversed, the guiding part of the counterbore drill is lengthened and passes through the machined workpiece, the guiding part is provided with a connecting hole for being connected with the extension rod 15 through the connecting pin 14. The adjustable height range of the counterbore limiter is greater than the distance from the blade part of the counterbore drill to the bottom of the connecting hole, so that the counterbore drill can be normally connected with the extension rod after the counterbore limiter is installed.

[0009] Further, the extension rod 15 is a positive taper structure, the large end part is connected with the gun air drill, and the extension rod is prevented from falling off during drilling.

[0010] In a second aspect, the application further provides a small-space reverse counterbore method with adjustable depth, which is realized by using the counterbore limiter and the counterbore drill. S1, the counterbore drill 13 is connected with the counterbore limiter 12 through threads, the guiding part 17 of the counterbore drill is inserted into the bottom hole of the test plate, the extension rod 15 and the counterbore drill 13 are connected with the connecting pin 14, the rotation is ensured to be smooth and the extension rod is prevented from falling off during drilling, the extension rod 15 is clamped by the air drill, the height scale of the counterbore limiter 12 is adjusted and holes are drilled, and the correct counterbore depth is determined, then the height scale of the counterbore limiter at this time is recorded. S2, the connecting pin 14 is pulled out, the extension rod 15 is removed, the counterbore drill 13 is installed, the counterbore limiter 12 is adjusted to the maximum position, and the counterbore limiter 12 and the counterbore drill 13 are ensured to completely enter the limited space. S3, the counterbore limiter 12 and the counterbore drill 13 are placed in the workpiece to be counterbored, the guiding part of the counterbore drill 13 is matched with the machined hole of the workpiece, the height of the counterbore limiter 12 is adjusted, and the connecting hole of the guiding part of the counterbore drill is completely exposed. S4, the extension rod 15 and the counterbore drill 13 are connected with the connecting pin 14, the rotation is ensured to be smooth and the extension rod is prevented from falling off during drilling, and the height scale of the counterbore limiter is adjusted according to the test result of the test plate. S5, the extension rod 15 is clamped by the gun air drill, the gun air drill is turned on and the extension rod 15 is pulled down until the limit is reached, and the small-space reverse counterbore process is realized.

[0011] The present invention has the beneficial effect of meeting the hole-making requirements of some working conditions with limited space. By providing a countersink stopper above the skin, the countersink reference is ensured to be on the skin surface, thereby ensuring countersink accuracy. The countersink stopper can also be adjusted up and down to meet the requirements of hole-making with different hole diameters and depths. This device is economical, simple to operate, and takes up little space. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 Schematic diagram of the countersink drill limiter principle; Figure 2 Countersink drill design drawing; Figure 3 Working diagram of a small space reverse countersinking device with adjustable depth; Explanation of the numbers in the figure: 1 limit sleeve; 2 movable sleeve; 3 coupling; 4 adjusting nut; 5 rotating shaft; 6 nut; 7 bearing; 8 bushing; 9 spring; 10 screw; 11 nylon sleeve; 12 countersink limiter; 13 countersink drill; 14 connecting pin; 15 extension rod, 16 countersink drill blade, 17 countersink drill guide part, 18 guide part connecting hole. DETAILED DESCRIPTION

[0013] The present application is described in further detail below with reference to the accompanying drawings of the embodiments.

[0014] like Figure 1 As shown, the countersink limiter rotating shaft 5 is installed between two deep groove ball bearings 7, and a limit screw 10 is used to cooperate with the groove of the rotating shaft 5 to limit its forward and backward movement. The rotating shaft 5 extends out of the nut 6. When installing the countersink drill, the rotating shaft 5 can be fixed with a wrench to ensure that the countersink drill thread is threadedly connected to the rotating shaft 5, and the nut 6 is threadedly connected to the rotating shaft 5. The limit sleeve 2, nut 6, and bushing 8 limit the position of the two deep groove ball bearings 7, and the limit sleeve 1 and bushing 8 limit the position of the spring 9. The coupling 3 presses against the spring 9, using its elastic force to achieve the up-and-down movement of the rotating shaft 5. The adjusting nut 4 is threadedly connected to the threads on the movable sleeve 2. The serrations of the adjusting nut 4 and the coupling 3 mesh with each other, limiting the range of motion of the countersinking limiter. The coupling 3 has a downwardly curved portion approximately 2 mm wide, which cooperates with the limiting groove on the movable sleeve 2, limiting the up-and-down movement of the coupling 3 along the limiting groove. The threaded area of ​​the movable sleeve 2 is marked with a scale to indicate the current adjustment position. A nylon sleeve 11 is threadedly connected to the limiting sleeve 1 to prevent the countersinking limiter from scratching the workpiece surface.

[0015] like Figure 2 As shown, the blade parameters of the countersink drill 13 are mirror-image designed, which allows the tool to make holes normally when reversed. The guide part of the countersink drill is lengthened to pass through the workpiece, and a connecting hole is provided on the guide part for connecting with the extension rod.

[0016] Furthermore, the adjustable height range of the countersink stopper 12 is greater than the distance from the blade of the countersink drill 13 to the bottom of the connecting hole, ensuring that the countersink drill 13 can be normally connected to the extension rod 15 after the countersink stopper 12 is installed.

[0017] Furthermore, the extension rod 15 has a positive taper structure, and the large end portion is connected to the gun-type air drill to prevent the extension rod from falling off during the hole making process.

[0018] like Figure 3 As shown, the reverse countersinking method using the device includes the following steps: 1. Connect each component to the test plate, adjust the height of the countersink stopper 12 and make a hole. After determining the correct countersink depth, record the height scale on the countersink stopper at this time. 2. Unplug the connecting pin 14, remove the extension rod 15, install the countersink drill 13, and adjust the countersink limiter 12 to the maximum position to ensure that the countersink limiter 12 and the countersink drill 13 can fully enter the confined space; 3. Place the countersink stopper 12 and the countersink drill 13 into the workpiece where the countersink is to be countersunk. The guide portion of the countersink drill 13 matches the workpiece hole to be machined. Adjust the height of the countersink stopper 12 to ensure that the connecting hole of the countersink drill guide is completely exposed. 4. Connect the extension rod 15 and the countersink drill 13 with the connecting pin 14 to ensure smooth rotation and that they will not fall off during the hole making process. Adjust the height scale on the countersink limiter according to the test results of the test plate. 5. Clamp the extension rod 15 with the pistol drill, turn on the drill and pull the extension rod 15 downward until it reaches the limit position to achieve the reverse countersinking process in a small space.

[0019] The present invention provides a depth-adjustable reverse countersinking method for small spaces. Different sizes of countersinking stoppers and countersink drills can be designed according to different working conditions. The countersinking stoppers can achieve precise height adjustment, meeting the needs of countersinking in different spaces, different hole diameters, and different depths. This approach addresses the need for serialization and rapid adaptation of reverse countersinking mechanisms.

[0020] The present invention provides a method for reverse countersinking in a small space with adjustable depth, and the device includes a countersink drill, a countersink limiter, an extension rod, and a connecting pin. According to the actual processing conditions, the countersink depth and the height of the countersink limiter can be adjusted to control the aperture and the size of the countersink, thereby realizing the hole-making requirements of different processing conditions. The device is clamped on a handheld air drill, and the taper of the extension rod is used to ensure that the tool will not fall off during the countersinking process. Since the countersink limiter has an adjustable countersink depth function and a scale on the movable sleeve, the countersink depth can be changed according to the aperture requirements. At the same time, the blade parameters of the countersink drill are mirror-imaged, which allows the tool to make holes normally when reversed. During operation, the air drill drives the extension rod, the user provides a downward feed pulling force, and the countersink limiter limits the countersink depth, thereby realizing reverse countersinking in a small space with adjustable depth.

[0021] The technical scheme of the present application is to meet the hole-making condition of limited space in some working conditions. A dimple limiter is arranged above the skin to ensure that the dimple reference is on the skin surface, thereby ensuring the dimple accuracy. Meanwhile, the dimple limiter can be adjusted up and down to meet the hole-making requirements of different dimple diameters and dimple depths. The device is economical, practical, simple to operate, and occupies a small space.

Claims

1. A countersinking stopper, characterized in that: include: Limit sleeve (1), movable sleeve (2), coupling (3), adjusting nut (4), rotating shaft (5), nut (6), bearing (7), bushing (8), spring (9), limit screw (10); The rotating shaft (5) is installed between the two deep groove ball bearings (7) and is matched with the groove of the rotating shaft (5) through a limit screw (10) to limit its forward and backward movement; the rotating shaft (5) extends out of the nut (6), the movable sleeve (2), the nut (6), and the bushing (8) limit the position of the two deep groove ball bearings (7), the limit sleeve (1) and the bushing (8) limit the position of the spring (9), the coupling (3) is pressed on the spring (9), and the elastic force of the spring (9) is used to realize the up and down movement of the rotating shaft (5), the adjusting nut (4) is connected to the thread on the movable sleeve (2) through a thread, and the serrations of the adjusting nut (4) and the coupling (3) are engaged with each other to limit the range of movement of the countersink limiter.

2. The countersinking stopper according to claim 1, characterized in that: The coupling (3) is provided with a 2 mm wide downwardly bent portion, which cooperates with the limit groove on the movable sleeve (2) so that the coupling (3) can only move up and down along the limit groove, and a scale line is set on the threaded area of ​​the movable sleeve (2) to display the current adjustment position.

3. The countersinking stopper according to claim 1, characterized in that: A nylon sleeve (11) is provided at the connection portion between the countersink limiter and the workpiece, and the nylon sleeve (11) is connected to the limiting sleeve (1) through a thread to prevent the countersink limiter from scratching the surface of the workpiece.

4. The countersinking stopper according to claim 1, characterized in that: When installing the countersink drill, the rotating shaft (5) is fixed by a wrench to ensure that the countersink drill thread is threadedly connected to the rotating shaft (5), and the nut (6) is threadedly connected to the rotating shaft (5).

5. The countersinking stopper according to claim 1, characterized in that: The blade parameters of the countersink drill (13) are designed to be mirror images, so that the tool can make holes normally when it is reversed. The guide part of the countersink drill is lengthened and passes through the workpiece to be processed. The guide part is provided with a connecting hole for connecting with the extension rod (15) through a connecting pin (14); The adjustable height range of the countersink stopper is greater than the distance from the countersink drill blade to the bottom of the connecting hole, ensuring that the countersink drill can be normally connected to the extension rod after the countersink stopper is installed.

6. The countersinking stopper according to claim 1, characterized in that: The extension rod (15) is a positive taper structure, and the large end portion is connected to the gun-type air drill to prevent the extension rod from falling off during the hole making process.

7. A method for reverse countersinking in a small space with adjustable depth, characterized in that: The method is implemented using the countersink limiter and countersink drill according to any one of claims 1 to 6, and the method comprises: S1, connect the countersink drill (13) to the countersink stopper (12) through a thread, insert the countersink drill guide part (17) into the bottom hole of the test plate, connect the extension rod (15) and the countersink drill (13) with a connecting pin (14), ensure smooth rotation and prevent it from falling off during the hole making process, clamp the extension rod (15) with a pneumatic drill, adjust the height of the countersink stopper (12) and make a hole, after determining the correct countersink depth, record the height scale on the countersink stopper at this time; S2, unplug the connecting pin (14), remove the extension rod (15), install the countersink drill (13), adjust the countersink limiter (12) to the maximum position, and ensure that the countersink limiter (12) and the countersink drill (13) completely enter the confined space; S3, placing the countersink stopper (12) and the countersink drill (13) into the workpiece where the countersink is to be countersunk, the guide portion of the countersink drill (13) matches the workpiece hole to be processed, and adjusting the height of the countersink stopper (12) to ensure that the connecting hole of the countersink drill guide portion is completely exposed; S4, connect the extension rod (15) and the countersink drill (13) with the connecting pin (14) to ensure smooth rotation and no falling off during the hole making process, and adjust the height scale on the countersink limiter according to the test results of the test plate; S5, the gun-type air drill clamps the extension rod (15), turns on the gun-type air drill and pulls the extension rod (15) downward until it reaches the limit position, thereby realizing the small space reverse countersinking process.

8. A computer program, characterized in that Used to implement a small space reverse countersinking method with adjustable depth as described in claim 7.

Images