A counterbore limiting device and counterboring method for aircraft skins

Abstract

The present application relates to the technical field of assembly manufacturing, in particular to a counterbore limiting device for aircraft skin and a counterbore method; the bending curvature of the arc-shaped plate can be adjusted through the first and second stretchers, so that the processing requirements of different curvature skins are met; in the process of being compressed, the first stretcher can transfer the gas inside to the second stretcher, so that the second stretcher expands and pushes the arc-shaped plate to bend, and then the arc-shaped plate can meet the use of skins with different curvatures, ensuring that the arc-shaped plate and the skin have a small gap, so that the counterbore depth of the hole position on the skin remains consistent, and the accuracy in the process of processing aircraft parts is improved.

Description

Technical Field

[0001] This invention relates to the field of assembly and manufacturing technology, and more specifically, to a countersinking limiting device and a countersinking method for aircraft skin. Background Technology

[0002] When countersinking is required in aircraft skins with high curvature, it is mainly used to locally countersink or drill holes on the surface of the workpiece to install connectors, such as threaded holes, countersunk holes, or to prepare for mating with other parts. The countersink depth directly determines the amount of unevenness or concavity after the connector is installed. Modern aircraft have extremely high technical requirements for aerodynamic surfaces. Currently, when countersinking skins, a countersinking drill is usually mounted on a countersink depth setting device, such as... Figure 1 As shown, the countersink depth fixing device can ensure that the depth of each countersink is consistent. However, when the existing countersink depth fixing device is used to countersink skin with large curvature, the contact area between the end of the device and the skin with different curvatures is different, which leads to inconsistent gaps between the device and the skin with different curvatures. This results in inconsistent countersink depths for holes with different curvatures at the same scale of the device, affecting the countersink quality of the skin. Summary of the Invention

[0003] This invention addresses the problem of existing countersinking devices requiring frequent adjustments based on changes in skin curvature during countersinking. It proposes a countersinking limiting device and method for aircraft skin. By incorporating a first and a second telescopic component to adjust the curvature of the arc-shaped plate, the gas inside the first telescopic component is transferred to the second telescopic component during compression. This causes the second telescopic component to expand and push the arc-shaped plate to bend, enabling the arc-shaped plate to accommodate skins with varying curvatures. This ensures a small gap between the arc-shaped plate and the skin, thereby maintaining consistent countersinking depth at the holes on the skin and improving the precision of aircraft component manufacturing.

[0004] The specific implementation details of this invention are as follows:

[0005] A countersunk depth limiting device for aircraft skin includes a countersunk depth fixing device body and a positioning unit;

[0006] The countersinking depth fixing device is equipped with a countersinking drill, and the positioning unit is sleeved on the countersinking drill;

[0007] The positioning unit includes a first telescopic component, a second telescopic component, a first fixed cylinder, a second fixed cylinder, an arc-shaped plate, and a fixing plate;

[0008] The first telescopic component is sleeved on the upper part of the reaming drill, the first fixing sleeve is sleeved on the middle part of the reaming drill, and the second fixing sleeve is sleeved on the lower part of the reaming drill;

[0009] The arc-shaped plate is arranged between the first fixing cylinder and the second fixing cylinder.

[0010] The fixing sheet is arranged on the inner side of the arc-shaped plate, one end of the fixing sheet is fixedly connected with the first fixing cylinder, and the other end is in a suspended state and does not contact the second fixing cylinder.

[0011] The first telescopic part is communicated with the second telescopic part through the trachea.

[0012] The second telescopic part is arranged between the arc-shaped plate and the fixing sheet and is detachably connected with the arc-shaped plate and the fixing sheet.

[0013] In order to better realize the present application, further, the positioning unit further comprises a third fixing cylinder and a fourth fixing cylinder.

[0014] The fourth fixing cylinder is sleeved on the upper part of the third fixing cylinder and is connected with the inner thread arranged on the inner wall of the fourth fixing cylinder through the outer thread arranged on the outer wall of the third fixing cylinder.

[0015] The first telescopic part is sleeved on the lower part of the third fixing cylinder and is sealingly connected with the third fixing cylinder.

[0016] In order to better realize the present application, further, the bottom of the fourth fixing cylinder is provided with a boss.

[0017] The outer diameter of the fourth fixing cylinder is greater than the outer diameter of the first telescopic part.

[0018] The boss is a circular ring structure, and the outer diameter of the boss is smaller than the outer diameter of the fourth fixing cylinder.

[0019] One end of the first telescopic part is sleeved on the boss, and the other end is sleeved on the third fixing cylinder.

[0020] In order to better realize the present application, further, the arc-shaped plate is provided with a mounting blind hole in the direction of the fixing sheet.

[0021] The fixing sheet is provided with a through hole.

[0022] The second telescopic part is provided with a first mounting pipe and a second mounting pipe, and the first mounting pipe and the second mounting pipe are communicated with the second telescopic pipe.

[0023] The first mounting pipe is mounted in the mounting blind hole, and the second mounting pipe is mounted in the through hole.

[0024] In order to better realize the present application, further, the arc-shaped plate and the fixing sheet are both provided with a guide groove.

[0025] One end of the guide groove on the arc-shaped plate is communicated with one side of the arc-shaped plate, and the other end is communicated with the mounting blind hole;

[0026] One end of the guide groove on the fixed sheet is communicated with one side of the fixed sheet, and the other end is communicated with the through hole.

[0027] In order to better realize the present application, further, a guide rod is arranged in the through hole;

[0028] The guide rod is inserted into the mounting blind hole after sequentially passing through the first mounting pipe and the second mounting pipe.

[0029] In order to better realize the present application, further, mounting cavities are arranged on both sides of the inner wall of the mounting blind hole, and elastic members and locking blocks are arranged in the mounting cavities;

[0030] A locking hole is arranged on the side wall of the guide rod;

[0031] The elastic members are used to push the locking blocks into the locking holes, so as to fix the guide rod in the mounting blind hole.

[0032] In order to better realize the present application, further, a connecting hole is arranged on the end of the guide rod which does not extend into the mounting blind hole, and the connecting hole is communicated with the locking hole;

[0033] An unlocking rod is arranged in the connecting hole, and the unlocking rod is connected with the connecting hole through threads;

[0034] A groove is arranged on the inner wall of the connecting hole of the guide rod, and a gas port is arranged on the side wall of the guide rod which is located in the second telescopic member, and the gas port is communicated with the groove;

[0035] The end of the guide rod is provided with a rotating head, the air pipe extends into the unlocking rod, and the air pipe extends out of the side wall of the unlocking rod which is located in the groove.

[0036] In order to better realize the present application, further, the number of the arc-shaped plates, the fixed sheets and the second telescopic members is four;

[0037] The arc-shaped plates and the fixed sheets are respectively arranged in an array on the circumferential side wall of the second fixed cylinder.

[0038] According to any one of the dimple limiting devices for aircraft skin, the first telescopic member is a bellows, and the second telescopic member is an air bag.

[0039] Based on the dimple limiting device for aircraft skin, in order to better realize the present application, further, a dimple method for aircraft skin is provided, which specifically includes the following steps:

[0040] Step S1: rotating the fourth fixed cylinder to extrude the first telescopic part, transferring the air pressure in the first telescopic part to the second telescopic part through the air pipe, and pushing the arc-shaped plate to bend;

[0041] Step S2: adjusting the bending degree of the arc-shaped plate according to the curvature of the skin to be processed, so that the arc-shaped plate and the skin to be processed have a small gap;

[0042] Step S3: connecting the reaming device body with the drilling machine, and adjusting the extension amount of the reaming drill in the positioning unit;

[0043] Step S4: starting the drilling machine to ream the skin to be processed, and repeating step S3 again according to the reaming depth until the reaming depth meets the processing requirements.

[0044] The present application has the following beneficial effects:

[0045] (1) The first telescopic part in the present application can transfer the gas in its interior to the second telescopic part when it is compressed, so that the second telescopic part expands and pushes the arc-shaped plate to bend, and then the arc-shaped plate can meet the skin with different curvatures, ensuring that the arc-shaped plate and the skin have a small gap, so that the reaming depth of the hole position on the skin can remain consistent, and the precision in the process of machining aircraft parts is improved.

[0046] (2) When the second telescopic part is scratched by iron filings during processing, it can be quickly disassembled from the arc-shaped plate and the fixed sheet, facilitating replacement, and the guide rod provided can prevent the second telescopic part from falling off during high-speed rotation of the reaming drill, ensuring the stability of the second telescopic part in use. DETAILED DESCRIPTION

[0047] Figure 1 It is a structure schematic view of the reaming depth setting device in the prior art.

[0048] Figure 2 It is a structure schematic view of the reaming depth setting device provided by the present application when used in the skin.

[0049] Figure 3 It is a structure schematic view of the reaming depth setting device provided by the present application.

[0050] Figure 4 It is a structure schematic view of the reaming depth setting device provided by the present application.

[0051] Figure 5 It is a structure schematic view of the reaming depth setting device provided by the present application Figure 4 A enlarged structure schematic view of the present application.

[0052] Figure 6This is a schematic diagram of the structure of the countersink depth determination device provided by the present invention when connected to the countersink drill.

[0053] Figure 7 This is a schematic diagram of the structure of the guide rod provided by the present invention.

[0054] Figure 8 This is a schematic diagram of the arc-shaped plate provided by the present invention.

[0055] Among them, 100, skin; 200, countersinking depth fixing device; 201, countersinking depth fixing device body; 202, fourth fixing cylinder; 203, arc plate; 205, countersinking drill; 206, second telescopic component; 207, fixing plate; 208, first telescopic component; 209, first fixing cylinder; 210, second fixing cylinder; 211, third fixing cylinder; 212, locking block; 214, unlocking rod; 215, guide rod; 216, first mounting tube; 217, elastic component; 218, air pipe; 219, second mounting tube; 220, groove; 222, rotating head; 223, guide groove; 224, mounting blind hole; 500, existing countersinking depth fixing device. Detailed Implementation

[0056] To more clearly illustrate the technical solutions of the embodiments of the present invention, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. It should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments, and therefore should not be regarded as a limitation on the scope of protection. 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.

[0057] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "set up," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0058] Example 1:

[0059] This embodiment proposes a countersinking limiting device for aircraft skin, such as... Figure 2 , Figure 3 As shown, it includes the countersink depth determination device body 201 and a positioning unit;

[0060] The countersinking depth fixing device body 201 is provided with a countersinking drill 205, and the positioning unit is sleeved on the countersinking drill 205;

[0061] The positioning unit comprises a first telescopic part 208, a second telescopic part 206, a first fixed cylinder 209, a second fixed cylinder 210, an arc-shaped plate 203, and a fixed sheet 207.

[0062] The first telescopic part 208 is sleeved on the upper part of the dimpling drill 205, the first fixed cylinder 209 is sleeved on the middle part of the dimpling drill 205, and the second fixed cylinder 210 is sleeved on the lower part of the dimpling drill 205.

[0063] The arc-shaped plate 203 is arranged between the first fixed cylinder 209 and the second fixed cylinder 210.

[0064] The fixed sheet 207 is arranged on the inner side of the arc-shaped plate 203, one end of the fixed sheet 207 is fixedly connected with the first fixed cylinder 209, and the other end is in a suspended state and does not contact the second fixed cylinder 210.

[0065] The first telescopic part 208 is in communication with the second telescopic part 206 through an air pipe 218.

[0066] The second telescopic part 206 is arranged between the arc-shaped plate 203 and the fixed sheet 207 and is detachably connected with the arc-shaped plate 203 and the fixed sheet 207.

[0067] Working principle: as Figure 1 The existing dimpling depth setting device 500 can ensure the consistency of the depth of each dimple, but when the dimpling depth setting device 500 is used to dimple the skin with large curvature, the contact area of the skin with different curvatures and the end part of the dimpling depth setting device is different, which leads to the inconsistency of the gap between the dimpling depth setting device and the curvature skin, and further leads to the inconsistency of the dimpling depth of the same scale needle for different curvature hole positions, which affects the dimpling quality of the skin. The embodiment comprises a dimpling depth setting device 200, the dimpling depth setting device 200 comprises a positioning unit and a dimpling depth setting device body 201, the dimpling depth setting device body 201 is provided with a dimpling drill 205, the positioning unit is sleeved on the dimpling drill 205, and the positioning unit is threadedly connected with the dimpling depth setting device body 201.

[0068] The positioning unit comprises a first telescopic part 208, a second telescopic part 206, a first fixed cylinder 209, a second fixed cylinder 210, and an arc-shaped plate 203 with elasticity, the first telescopic part 208 is sleeved on the dimpling drill 205, and the first telescopic part 208 can be telescoped along the axial direction of the dimpling drill 205.

[0069] The first fixed cylinder 209 and the second fixed cylinder 210 are sleeved on the gash drill 205, one end of the arc-shaped plate 203 is connected with the first fixed cylinder 209, and the other end is connected with the second fixed cylinder 210. The arc-shaped plate 203 is made of spring steel and has a certain elasticity. When the arc-shaped plate 203 is bent between the first fixed cylinder 209 and the second fixed cylinder 210, the curvature of the arc-shaped plate 203 will change, so as to adapt to the skin with different curvatures.

[0070] The second telescopic part 206 can be telescoped along the bending direction of the arc-shaped plate 203, and the second telescopic part 206 is communicated with the first telescopic part 208 through the air pipe 218. When the first telescopic part 208 is compressed along the axial direction of the gash drill 205, the fluid in the first telescopic part 208 will be transferred to the second telescopic part 206, so as to force the second telescopic part 206 to stretch towards the bending direction of the arc-shaped plate 203, and then push the arc-shaped plate 203 to bend, so as to change the curvature of the arc-shaped plate 203, thereby meeting the skin with different curvatures.

[0071] The positioning unit further comprises a fixed sheet 207, one end of the fixed sheet 207 is fixed on the first fixed cylinder 209, the fixed sheet 207 is in an arc-shaped structure, and the fixed sheet 207 is made of hard metal material. The fixed sheet 207 is located on the inner side of the arc-shaped plate 203, and the second telescopic part 206 is located between the arc-shaped plate 203 and the fixed sheet 207.

[0072] In order to ensure that the gas in the first telescopic part 208 transferred to the second telescopic part 206 can force the second telescopic part 206 to push the arc-shaped plate 203 to bend and change the curvature of the arc-shaped plate 203 when the first telescopic part 208 is compressed, the fixed sheet 207 is arranged between the first fixed cylinder 209 and the second fixed cylinder 210. One end of the fixed sheet 207 is fixed on the first fixed cylinder 209, and the other end is in a suspended state. When the second telescopic part 206 is stretched, the second telescopic part 206 can be stretched towards the arc-shaped plate 203 under the action of the fixed sheet 207, and finally smoothly push the arc-shaped plate 203 to bend. When the arc-shaped plate 203 is bent, the two ends of the arc-shaped plate 203 will pull the first fixed cylinder 209 and the second fixed cylinder 210 to move towards the center, so as to change the gap between the first fixed cylinder 209 and the second fixed cylinder 210. Therefore, one end of the fixed sheet 207 is not in contact with the second fixed cylinder 210, so as to ensure that the first fixed cylinder 209 and the second fixed cylinder 210 have a certain amount of movement when the arc-shaped plate 203 is bent.

[0073] Embodiment 2:

[0074] Based on the above-mentioned embodiment 1, as Figure 4As shown, the positioning unit further comprises a third fixed cylinder 211 and a fourth fixed cylinder 202;

[0075] The fourth fixed cylinder 202 is sleeved on the upper part of the third fixed cylinder 211 and is connected with the inner thread arranged on the inner wall of the fourth fixed cylinder 202 through the outer thread arranged on the outer wall of the third fixed cylinder 211.

[0076] The first telescopic part 208 is sleeved on the lower part of the third fixed cylinder 211 and is sealingly connected with the third fixed cylinder 211.

[0077] In order to better realize the present application, further, the bottom of the fourth fixed cylinder 202 is provided with a boss.

[0078] The outer diameter of the fourth fixed cylinder 202 is greater than the outer diameter of the first telescopic part 208.

[0079] The boss is a circular ring structure, and the outer diameter of the boss is smaller than the outer diameter of the fourth fixed cylinder 202.

[0080] One end of the first telescopic part 208 is sleeved on the boss, and the other end is sleeved on the third fixed cylinder 211.

[0081] Working principle: the positioning unit provided in the embodiment further comprises a third fixed cylinder 211 and a fourth fixed cylinder 202, wherein the inner thread is arranged on the inner wall of the third fixed cylinder 211, and the outer thread matched with the inner thread is arranged on the outer surface of the dimple depth setting device body 201, therefore, the quick connection between the third fixed cylinder 211 and the dimple depth setting device body 201 can be realized by using the arranged inner thread and outer thread, and it is ensured that the positioning unit arranged can be stably fixed on the dimple depth setting device body 201.

[0082] The fourth fixed cylinder 202 is sleeved on the third fixed cylinder 211, the outer thread is arranged on the outer surface of the third fixed cylinder 211, the inner thread is arranged on the inner wall of the fourth fixed cylinder 202, and the quick connection between the third fixed cylinder 211 and the fourth fixed cylinder 202 can be realized by using the arranged thread.

[0083] The first telescopic part 208 is a bellows, and the second telescopic part 206 is an air bag.

[0084] The outer diameter of the fourth fixed cylinder 202 is greater than the outer diameter of the first telescopic part 208, so that when the fourth fixed cylinder 202 arranged on the third fixed cylinder 211 is rotated, the fourth fixed cylinder 202 moves towards the first telescopic part 208. Since the first telescopic part 208 is a bellows, the end thereof can be compressed after being pressed by the fourth fixed cylinder 202. Since the gas is incompressible, the gas originally in the first telescopic part 208 is pressed into the second telescopic part 206, so that the second telescopic part 206 is finally expanded, and the gradually expanding second telescopic part 206 finally pushes the arc-shaped plate 203 to bend.

[0085] Preferably, the bottom of the fourth fixed cylinder 202 is provided with a boss, the boss is a circular ring structure, the outer diameter of the boss is less than the outer diameter of the fourth fixed cylinder 202, one end of the first telescopic part 208 is sleeved on the outer wall of the third fixed cylinder 211, and the first telescopic part 208 is in sealing connection with the third fixed cylinder 211. The other end of the first telescopic part 208 is sleeved on the boss of the fourth fixed cylinder 202, and the boss can make the first telescopic part 208 and the fourth fixed cylinder 202 have good air tightness. When the fourth fixed cylinder 202 arranged is rotated and moves on the third fixed cylinder 211, the first telescopic part 208 can be smoothly pressed, and the gas in the first telescopic part 208 is transferred to the second telescopic part 206.

[0086] In use, the positioning unit is first installed on the dimpling depth device body 201, then the fourth fixed cylinder 202 is rotated according to the curvature of the skin 100 to be processed, so that the fourth fixed cylinder 202 moves on the third fixed cylinder 211 towards the first telescopic part 208, the first telescopic part 208 is compressed, and when the first telescopic part 208 is compressed, the gas in the first telescopic part 208 is transferred to the second telescopic part 206 through the gas pipe 218, so that the second telescopic part 206 expands towards the arc-shaped plate 203, the expanded second telescopic part 206 acts on the central position of the arc-shaped plate 203, so that the arc-shaped plate 203 is deformed, and the curvature of the arc-shaped plate 203 is changed. Therefore, when the skin 100 of the aircraft with different curvatures is dimpled, the bending degree of the arc-shaped plate 203 can be adjusted according to the curvature of the skin 100, so that the arc-shaped plate 203 can be adapted to the skin 100, the gap between the arc-shaped plate 203 and the skin 100 is reduced, and the dimpling precision of the skin 100 is improved.

[0087] The second telescopic part 206 is detachably connected with the arc-shaped plate 203 and the fixed sheet 207.

[0088] Since the processing iron filings are generated when the dimple drill 205 is used to counterbore the skin 100, the second telescopic member 206 is a rubber material air bag, so that the second telescopic member 206 has a certain probability of being scratched by the iron filings, causing the gas inside the second telescopic member 206 to leak. Therefore, in the embodiment, the second telescopic member 206, the arc plate 203 and the fixing plate 207 are connected in a detachable manner, so that when the second telescopic member 206 is damaged, the second telescopic member 206 can be conveniently and quickly detached from the arc plate 203 and the fixing plate 207, and the second telescopic member 206 can be replaced.

[0089] The other parts of the embodiment are the same as those of the above-mentioned embodiment 1, and will not be described again.

[0090] Embodiment 3

[0091] The embodiment is based on any one of the above-mentioned embodiments 1-2, as shown in the figure, the arc plate 203 is provided with a mounting blind hole 224 towards the fixing plate 207; Figure 5

[0092] The fixing plate 207 is provided with a through hole;

[0093] The second telescopic member 206 is provided with a first mounting pipe 216 and a second mounting pipe 219, and the first mounting pipe 216 and the second mounting pipe 219 are in communication with the second telescopic pipe 206;

[0094] The first mounting pipe 216 is mounted in the mounting blind hole 224, and the second mounting pipe 219 is mounted in the through hole.

[0095] Working principle: the arc plate 203 provided in the embodiment is provided with a mounting blind hole 224 towards the fixing plate 207, the fixing plate 207 is provided with a through hole, the second telescopic member 206 is provided with a first mounting pipe 216 and a second mounting pipe 219, and the first mounting pipe 216 and the second mounting pipe 219 are in communication with the second telescopic pipe 206; the first mounting pipe 216 is mounted in the mounting blind hole 224, and the second mounting pipe 219 is mounted in the through hole.

[0096] ​In order to realize the detachable connection between the second telescopic member 206 and the arc-shaped plate 203 and the fixed sheet 207, the first mounting pipe 216 and the second mounting pipe 219 are arranged on the second telescopic member 206. When mounting, the first mounting pipe 216 is inserted into the mounting blind hole 224 of the arc-shaped plate 203, and then the second mounting pipe 219 is mounted in the through hole of the fixed sheet 207. When the second telescopic member 206 needs to be replaced due to damage, the first mounting pipe 216 in the mounting blind hole 224 is pulled out, and the second mounting pipe 219 in the through hole is pulled out, so that the second telescopic member 206 can be quickly replaced.

[0097] The other parts of the embodiment are the same as any one of the above-mentioned embodiments 1-embodiment 2, and will not be repeated here.

[0098] Embodiment 4:

[0099] On the basis of any one of the above-mentioned embodiments 1-embodiment 3, as shown in the figure, the arc-shaped plate 203 and the fixed sheet 207 are both provided with a guide groove 223. Figure 8

[0100] One end of the guide groove 223 on the arc-shaped plate 203 is in communication with one side of the arc-shaped plate 203, and the other end is in communication with the mounting blind hole 224.

[0101] One end of the guide groove 223 on the fixed sheet 207 is in communication with one side of the fixed sheet 207, and the other end is in communication with the through hole.

[0102] Working principle: In the embodiment, the arc-shaped plate 203 and the fixed sheet 207 are both provided with a guide groove 223. One end of the guide groove 223 on the arc-shaped plate 203 is in communication with one side of the arc-shaped plate 203, and the other end is in communication with the mounting blind hole 224. One end of the guide groove 223 on the fixed sheet 207 is in communication with one side of the fixed sheet 207, and the other end is in communication with the through hole.

[0103] During the installation of the second telescopic member 206, the second telescopic member 206 needs to be installed between the fixed sheet 207 and the arc-shaped plate 203. In order to facilitate installation, the guide groove 223 is arranged on the arc-shaped plate 203 and the fixed sheet 207. Therefore, during installation, the first mounting pipe 216 and the second mounting pipe 219 can be easily and quickly slid into the through hole and the mounting blind hole 224 by using the guide groove 223, thereby providing convenience for the installation of the second telescopic member 206.

[0104] The other parts of the embodiment are the same as any one of the above-mentioned embodiments 1-embodiment 3, and will not be repeated here.

[0105] Embodiment 5:

[0106] ​The embodiment is based on any one of the above embodiments 1-4, as shown in Figure 5 、 Figure 7 The guide rod 215 is arranged in the through hole.

[0107] The guide rod 215 is sequentially inserted into the first mounting pipe 216, the second mounting pipe 219, and the mounting blind hole 224.

[0108] Working principle: The guide rod 215 is arranged in the through hole, and the guide rod 215 is sequentially inserted into the first mounting pipe 216, the second mounting pipe 219, and the mounting blind hole 224.

[0109] During the process of tapping the skin 100 by the groove drill 205, the groove drill 205 drives the positioning unit to rotate at high speed. In order to prevent the first mounting pipe 216 and the second mounting pipe 219 on the second telescopic member 206 from falling out of the mounting blind hole 224 or the through hole, the guide rod 215 is arranged. The guide rod 215 can limit the second telescopic member 206 to a certain extent, avoiding the second telescopic member 206 from falling out in the high-speed rotating state.

[0110] The other parts of the embodiment are the same as any one of the above embodiments 1-4, and will not be repeated here.

[0111] Embodiment 6:

[0112] The embodiment is based on any one of the above embodiments 1-5, as shown in Figure 5 The inner wall of the mounting blind hole 224 is provided with a mounting cavity, and the mounting cavity is provided with an elastic member 217 and a locking block 212.

[0113] The side wall of the guide rod 215 is provided with a locking hole.

[0114] The elastic member 217 is used to push the locking block 212 into the locking hole, so as to fix the guide rod 215 in the mounting blind hole 224.

[0115] Working principle: The inner wall of the mounting blind hole 224 is provided with a mounting cavity, and the mounting cavity is provided with an elastic member 217 and a locking block 212. The side wall of the guide rod 215 is provided with a locking hole, and the elastic member 217 is used to push the locking block 212 into the locking hole, so as to fix the guide rod 215 in the mounting blind hole 224.

[0116] In this embodiment, to prevent the guide rod 215 from falling off on its own, a locking block 212 is provided in the mounting blind hole 224. When the guide rod 215 is inserted into the mounting blind hole 224 and the locking hole on the guide rod 215 moves to be flush with the locking block 212, the locking block 212 is inserted into the locking hole under the action of the elastic member 217, thereby fixing the guide rod 215 in the mounting blind hole.

[0117] When the second telescopic member 206 expands and pushes the arc plate 203 to completely deform, the arc plate 203, under the action of the blind hole 224, pulls the guide rod 215 to move together. The other end of the guide rod 215 always extends out of the through hole. That is, no matter how much the second telescopic member 206 expands, the guide rod 215 is always outside the through hole.

[0118] The other parts of this embodiment are the same as any one of the above embodiments 1-5, so they will not be described again.

[0119] Example 7:

[0120] This embodiment is based on any one of embodiments 1-6 above, such as Figure 7 , Figure 5 As shown, the end of the guide rod 215 that does not extend into the mounting blind hole 224 is provided with a connecting hole, which communicates with the locking hole;

[0121] An unlocking rod 214 is provided inside the connection hole, and the unlocking rod 214 is connected to the connection hole by a thread;

[0122] A groove 220 is provided on the inner wall of the connecting hole of the guide rod 215, and an air port is provided on the side wall of the guide rod 215 located inside the second telescopic member 206. The air port communicates with the groove 220.

[0123] The end of the guide rod 215 is provided with a rotating head 222, the air tube 218 extends into the unlocking rod 214, and the air tube 218 extends from the side wall of the unlocking rod 214 located in the groove 220.

[0124] Working principle: the end of the guide rod 215 which does not extend into the mounting blind hole 224 is provided with a connecting hole which is in communication with the locking hole; the connecting hole is provided with an unlocking rod 214 which is connected with the connecting hole through screw thread; the inner wall of the connecting hole of the guide rod 215 is provided with a groove 220, the side wall of the guide rod 215 which is located in the second telescopic part 206 is provided with an air port which is in communication with the groove 220; the end of the guide rod 215 is provided with a rotating head 222, the air pipe 218 extends into the unlocking rod 214, and the air pipe 218 extends out of the side wall of the unlocking rod 214 which is located in the groove 220.

[0125] When the first telescopic part 208 is compressed, the gas in the first telescopic part 208 is transferred into the groove 220 through the air pipe 218, and finally into the second telescopic part 206 through the air port, so as to realize the expansion of the second telescopic part 206.

[0126] When the second telescopic part 206 is damaged and needs to be replaced, the unlocking rod 214 is rotated to move outward, so that the end of the air pipe 218 which is originally located in the groove 220 moves out of the groove 220, at this time, the air pipe 218 is disconnected from the second telescopic part 206, and at the same time, the end of the unlocking rod 214 moves from the connecting hole to the air port, at this time, the connecting hole is in communication with the air port, therefore, when the second telescopic part 206 is compressed, the gas filled in the second telescopic part 206 will enter the connecting hole through the air port, and finally enter the locking hole of the guide rod 215 through the connecting hole, under the action of air pressure, the locking block 212 located in the locking hole is pushed back to move, the locking of the guide rod 215 by the locking block 212 is removed, so that the guide rod 215 can be smoothly taken out of the mounting blind hole 224, realizing the replacement of the second telescopic part 206.

[0127] In order to ensure that the locking block 212 does not interfere with the guide rod 215 when the guide rod 215 is reinserted into the mounting blind hole 224, the end of the locking block 212 is provided with an inclined surface, when the guide rod 215 is inserted into the mounting blind hole 224, the guide rod 215 acts on the inclined surface of the locking block 212, so that the locking block 212 can automatically retract back, reducing the interference of the locking block 212 to the guide rod 215.

[0128] The other parts of the embodiment are the same as any one of the above-mentioned embodiments 1-6, and will not be described again.

[0129] Embodiment 8:

[0130] The arc-shaped plates 203, the fixed plates 207 and the second stretchers 206 are all four, and the arc-shaped plates 203 and the fixed plates 207 are respectively arrayed on the circumferential sidewall of the second fixed cylinder 210 around the slot drill 205.

[0131] Working principle: In order to ensure that the slot drill 205 has good supporting force with the skin 100 in the process of counterboring the skin 100, the arc-shaped plates 203 are four, which can improve the stability of the slot drill 205 in the process of counterboring the skin 100.

[0132] The other parts of the embodiment are the same as any one of the above-mentioned embodiments 1-7, and thus will not be described again.

[0133] Embodiment 9:

[0134] The embodiment is based on any one of the above-mentioned embodiments 1-8, and proposes a counterboring method for an aircraft skin, which specifically includes the following steps:

[0135] Step S1: connecting the positioning unit with the counterboring depth setting device body 201, rotating the fourth fixed cylinder 202, extruding the first stretcher 208, so that the air pressure in the first stretcher 208 is transferred to the second stretcher 206, forcing the second stretcher 206 to expand and pushing the arc-shaped plate 203 to bend;

[0136] Step S2: according to the bending degree of the arc-shaped plate 203 according to the curvature of the skin to be processed, ensuring that the arc-shaped plate 203 has a small gap with the skin 100;

[0137] Step S3: connecting the counterboring depth setting device body 201 with the drilling machine, adjusting the protruding amount of the slot drill 205 in the positioning unit;

[0138] Step S4: starting the drilling machine to counterbore the skin, and repeating step S3 again according to the counterboring depth until the depth of the counterbore meets the processing requirements.

[0139] The other parts of the embodiment are the same as any one of the above-mentioned embodiments 1-8, and thus will not be described again.

[0140] The above is only the preferred embodiment of the present application, and does not limit the present application in any form. Any simple modification or equivalent change according to the technical essence of the present application to the above embodiment falls within the protection scope of the present application.

Claims

1. A counterbore stop for use with aircraft skin, comprising: The tamping depth device body (201) is provided with a tamping drill (205), and the positioning unit is sleeved on the tamping drill (205); The positioning unit comprises a first telescopic part (208), a second telescopic part (206), a first fixed cylinder (209), a second fixed cylinder (210), an arc-shaped plate (203) and a fixed sheet (207); The first telescopic part (208) is sleeved on the upper part of the tamping drill (205), the first fixed cylinder (209) is sleeved on the middle part of the tamping drill (205), and the second fixed cylinder (210) is sleeved on the lower part of the tamping drill (205); The arc-shaped plate (203) is arranged between the first fixed cylinder (209) and the second fixed cylinder (210); The fixed sheet (207) is arranged on the inner side of the arc-shaped plate (203), one end of the fixed sheet (207) is fixedly connected with the first fixed cylinder (209), and the other end is in a suspended state and does not contact the second fixed cylinder (210); The first telescopic part (208) is in communication with the second telescopic part (206) through an air pipe (218); The second telescopic part (206) is arranged between the arc-shaped plate (203) and the fixed sheet (207) and is detachably connected with the arc-shaped plate (203) and the fixed sheet (207). The positioning unit further comprises a third fixed cylinder (211) and a fourth fixed cylinder (202); 2. A counterbore stop for use with aircraft skin as defined in claim 1, wherein, The fourth fixed cylinder (202) is sleeved on the upper part of the third fixed cylinder (211) and is connected with the outer thread arranged on the outer wall of the third fixed cylinder (211) and the inner thread arranged on the inner wall of the fourth fixed cylinder (202); The first telescopic part (208) is sleeved on the lower part of the third fixed cylinder (211) and is in sealing connection with the third fixed cylinder (211). The bottom of the fourth fixed cylinder (202) is provided with a boss; 3. A counterbore stop for use with aircraft skin as defined in claim 2, wherein, The outer diameter of the fourth fixed cylinder (202) is greater than that of the first telescopic part (208); The boss is a circular ring structure, and the outer diameter of the boss is smaller than that of the fourth fixed cylinder (202); One end of the first telescopic part (208) is sleeved on the boss, and the other end is sleeved on the third fixed cylinder (211). The arc-shaped plate (203) is provided with a mounting blind hole (224) in the direction of the fixed sheet (207); 4. A counterbore stop for use with aircraft skin as defined in claim 1, wherein, The fixed sheet (207) is provided with a through hole; The second telescopic part (206) is provided with a first mounting pipe (216) and a second mounting pipe (219), and the first mounting pipe (216) and the second mounting pipe (219) are in communication with the second telescopic part (206); The first mounting pipe (216) is mounted in the mounting blind hole (224), and the second mounting pipe (219) is mounted in the through hole. The arc-shaped plate (203) and the fixed sheet (207) are both provided with a guide groove (223).

5. A counterbore stop for use with aircraft skin panels as defined in claim 4, wherein, ​ One end of the guide groove (223) on the arc-shaped plate (203) is in communication with one side of the arc-shaped plate (203), and the other end is in communication with the mounting blind hole (224); One end of the guide groove (223) on the fixed sheet (207) is in communication with one side of the fixed sheet (207), and the other end is in communication with the through hole.

6. A counterbore stop for use with aircraft skin panels as defined in claim 4, wherein, The through hole is provided with a guide rod (215); The guide rod (215) passes through the first mounting pipe (216) and the second mounting pipe (219) in sequence and is inserted into the mounting blind hole (224).

7. A counterbore stop for use with aircraft skin as defined in claim 6 wherein, The inner wall of the mounting blind hole (224) is provided with mounting cavities on both sides, and the mounting cavities are provided with elastic members (217) and locking blocks (212); The side wall of the guide rod (215) is provided with a locking hole; The elastic member (217) is used for pushing the locking block (212) to be inserted into the locking hole, so as to fix the guide rod (215) in the mounting blind hole (224).

8. A counterbore stop for use with aircraft skin as defined in claim 7, wherein, The end of the guide rod (215) not extending into the mounting blind hole (224) is provided with a connecting hole, and the connecting hole is in communication with the locking hole; The connecting hole is provided with an unlocking rod (214), and the unlocking rod (214) is connected with the connecting hole through threads; The inner wall of the connecting hole of the guide rod (215) is provided with a groove (220), and the side wall of the guide rod (215) located in the second telescopic member (206) is provided with an air port, and the air port is in communication with the groove (220); The end of the guide rod (215) is provided with a rotating head (222), the air pipe (218) extends into the unlocking rod (214), and the air pipe (218) extends from the side wall of the unlocking rod (214) located in the groove (220).

9. A counterbore stop for an aircraft skin as defined in any one of claims 1 to 8, characterized in that The number of the arc-shaped plates (203), the fixed sheets (207) and the second telescopic members (206) is four. The arc-shaped plates (203) and the fixed sheets (207) are arrayed on the circumferential side wall of the second fixed cylinder (210) around the slot drill (205) respectively.

10. The dimple limiting device for aircraft skin according to any one of claims 1-8, wherein the first telescopic member (208) is a bellows, and the second telescopic member (206) is an air bag.

11. A method for counter sinking of aircraft skin, implemented on the basis of the counter sinking stop device for aircraft skin as claimed in claim 2; characterized in that, Specifically comprising the following steps: Step S1: rotating the fourth fixed cylinder (202) to extrude the first telescopic member (208), and transferring the air pressure in the first telescopic member (208) to the second telescopic member (206) through the air pipe (218) to push the arc-shaped plate (203) to bend; Step S2: adjusting the bending degree of the arc-shaped plate (203) according to the curvature of the skin (100) to be processed, so as to ensure that the arc-shaped plate (203) has a small gap with the skin (100) to be processed; Step S3: connecting the dimple device body (201) with a drilling machine, and adjusting the extension amount of the slot drill (205) in the positioning unit; Step S4: starting the drilling machine to dimple the skin (100) to be processed, and repeatedly adjusting the dimple depth according to the dimple depth to repeat step S3 until the dimple depth meets the processing requirement.

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