Radome replacement device and method

Abstract

The invention provides an antenna housing replacement device, which comprises a guide hole base, a guide hole, a screw rod, a screw rod, a screw rod, a screw rod, a screw rod, a screw rod, a screw rod, a screw rod and a screw rod, the hollow screw is installed in the machine body supporting plate nut limiting hole, and the hollow screw is used for installing the guide hole base on a machine body structure; the drill jig plate is provided with a drill jig hole, and the drill jig hole is coaxial with the machine body supporting plate nut limiting hole; wherein the drill plate is connected with the guide hole base; the drilling jig is arranged in the drilling jig hole, and the drilling jig is used for drilling a hole in the antenna housing; the process screw penetrates through the drill jig hole and is connected with the hollow screw, and the antenna housing is fixed on a machine body structure; meanwhile, the invention further provides an antenna housing replacement method. The drilling device is convenient to use and high in drilling accuracy.

Description

Technical Field

[0001] The present application belongs to the field of aviation assembly manufacturing technology, and in particular, relates to a radome replacement device and method. Background Art

[0002] The radome is one of the important components of the aircraft. It is a structure that protects the antenna system from the influence of the external environment, including but not limited to severe weather conditions such as wind, rain, hail, dust, solar radiation, severe cold and heat. In addition, the radome can also reduce the wear, corrosion and aging of the antenna system and extend its service life. It has good electromagnetic wave penetration characteristics in electrical performance to ensure the working performance of the antenna system.

[0003] In the process of scientific research and production, mission flight, and aircraft overhaul, the radome is scrapped because the test parameters of the radome body do not meet the standards or the radome is damaged by external impact. The current process for replacing a new radome is: remove the old radome → remove the glue layer on the skin surface → remove the support nut on the aircraft structure → clamp the new radome according to the assembly hole → make a hole from the inside of the fuselage to the radome → disassemble the radome → rivet the support nut for the second time → test install the radome and adjust the status → disassemble the radome → clean up the excess → glue and shape the radome → screw the radome to the fuselage.

[0004] When removing the rivets on the support plate nut, the rivet hole will be enlarged, the secondary riveting connection strength will drop sharply, and the replacement of the support plate nut will increase the production cost. When drilling holes from the inside of the fuselage to the outside of the radome, the drill will scratch the fuselage bolt hole wall. In the narrow space, the guide hole cannot be made vertically to the radome. If the hole is drawn from the outside of the radome, the accuracy is low, the error is large, the hole making is difficult, and the risk is high. This replacement method has a long production cycle and it is difficult to control the excess material inside the aircraft. Summary of the invention

[0005] Purpose of the invention: The present invention avoids the insufficient connection strength caused by the secondary disassembly and assembly of the support plate nut during the replacement of a new antenna cover, avoids the scratching of the body bolt hole wall during hole making, and at the same time improves the hole making quality on the antenna cover, and provides a coordinated replacement and assembly device and method for the antenna cover that is easy to use and has high hole making accuracy.

[0006] In a first aspect, the present application provides a radome replacement device, the device comprising:

[0007] The lead hole base has a thin end and a thick end, and the thin end of the lead hole base is provided with a limit hole for the organic support plate nut;

[0008] A hollow screw is installed in the limiting hole of the body support plate nut, and the hollow screw is used to install the guide hole base on the body structure; wherein the sum of the thickness of the thin end of the guide hole base and the thickness of the head of the hollow screw is equal to the thickness of the adhesive layer on the surface of the body; the hollow screw is coaxial with the limiting hole of the body support plate nut;

[0009] A drilling template, having a drilling template hole, wherein the drilling template hole is coaxial with the limiting hole of the body support plate nut; wherein the drilling template is connected to the guide hole base;

[0010] A drilling jig, arranged in the drilling jig hole, the drilling jig being used to drill a hole on the radome;

[0011] A process screw passes through the jig hole and is connected with the hollow screw to fix the antenna cover on the body structure.

[0012] Preferably, a threaded hole is provided at the thick end of the guide hole base, the drilling template also has a thick end and a thin end, the drilling template hole is provided at the thin end of the drilling template, and a through hole is provided at the thick end of the drilling template.

[0013] Preferably, the device further comprises:

[0014] A gasket is arranged between the threaded hole and the through hole, and the gasket is used to adjust the drilling template to ensure that the drilling template is parallel and fits the outer surface of the antenna cover.

[0015] Preferably, the device further comprises:

[0016] A stud, one end of which passes through the through hole and is connected to the threaded hole;

[0017] A nut is arranged at the other end of the stud, and the nut is used to lock the drilling template on the guide hole base.

[0018] Preferably, the device further comprises:

[0019] A bushing is arranged on the stud.

[0020] In a second aspect, the present application also provides a method for replacing a radome, the method comprising:

[0021] Lift the new radome onto the work bracket;

[0022] Slowly move the new radome to 50cm from the fuselage surface, adjust the position of the new radome assembly hole, add a 3mm plastic gasket between the new radome and the fuselage surface, and fix the new radome to the fuselage surface with process bolts;

[0023] Screw the stud into the base of the lead hole, adjust the height of the drilling template with a gasket, ensure that the drilling template is parallel to the outer surface of the new radome, install the drilling template on the stud, adjust the extension of the thread with the bushing, and tighten it with a nut. The surface that fits the product needs to be protected with tape;

[0024] Check the installation position accuracy and bolt margin of the new radome, loosen the brackets and readjust the parts with inappropriate margin until the margin is appropriate;

[0025] Use a φ4mm alloy steel drill bit and a drill jig to drill a new antenna cover primary hole in the drill jig hole on the drill template, then use an M4 bolt with a polished rod to tighten the drill jig together on the hole guide device, and use the same method to make all the bolt primary holes;

[0026] Loosen the bracket, remove the new antenna cover and the hole guide device, use a 4mm φ reamer and reamer to expand and ream the bolt holes according to the technical requirements, and then remove the burrs and chamfer them;

[0027] Clean the bonding surface and the surrounding environment, and glue the new radome to the surface of the fuselage structure. The glue application temperature is 15℃~30℃, and the relative humidity is 35%~80%. The glue layer can be reshaped only when the hardness of the glue reaches 30 Shore hardness.

[0028] Use product bolts to screw the new radome onto the surface of the fuselage structure to complete the replacement of the radome.

[0029] Preferably, before the new radome is hoisted onto the working bracket, the method further comprises:

[0030] Remove the scrapped radome and clean the glue layer on the surface of the fuselage structure with a scraping board;

[0031] Use a screwdriver to pass the hollow screw through the guide hole base and fix it on the surface of the body structure. The surface that fits the product needs to be protected with tape to avoid scratching the product surface. The guide hole device is placed along the normal direction of the antenna cover.

[0032] Open the outer packaging of the new radome, conduct an appearance inspection, check the log book, and protect the non-construction surface.

[0033] Preferably, the method further comprises:

[0034] Before drilling, the operator must wear a one-piece dust-proof suit and a dust mask correctly to avoid damage to the human body by fibers.

[0035] Beneficial technical effects of this application:

[0036] The present invention provides a hole-guiding device and a replacement method for the radome without removing the support plate nut inside the body structure. The hole-guiding base and hollow screw, stud and drilling template, drilling template and drilling template are all H7 / g6, the coaxiality of shaft parts is ≯0.01mm, the verticality of the stud and the hole-guiding base after installation is ≯0.01mm, and finally the coaxiality of the axis of the hollow screw and the axis of the drilling template after assembly is guaranteed to be ≯0.02mm. Using the drilling template to drill the initial hole of φ4mm better guarantees the verticality and coaxiality of the bolt hole. The alloy steel tool is used to drill the bolt hole of the radome, which can increase the service life of the tool and improve the quality of the bolt hole.

[0037] The research scheme of the antenna cover replacement method of the present invention solves the quality defects such as insufficient bolt connection strength, scratches on the bolt hole wall, and low accuracy of drawing lines and holes in narrow spaces caused by secondary disassembly and assembly of the support plate nut in the past, thereby improving the replacement efficiency of the antenna cover, reducing production costs, and improving the installation quality of the antenna cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a schematic diagram of the structural decomposition of the hole-guiding device;

[0039] Figure 2 It is a structural schematic diagram of the hole-drawing device;

[0040] Figure 3 It is a schematic cross-sectional view of the structure of the hole-drawing device;

[0041] Figure 4 It is a schematic diagram of the structure used in the process of replacing the radome;

[0042] Figure 5 It is a partial enlarged diagram of the use structure of a single hole-guiding device;

[0043] Figure 6 It is a schematic diagram of the cross-section of the structure used in the process of replacing the radome;

[0044] Figure 7 It is a schematic diagram of a partial cross section of the structure of the hole-guiding device;

[0045] Among them: 1. Guide hole base; 2. Gasket; 3. Drill template; 4. Stud; 5. Bushing; 6. Nut; 7. Process screw; 8. Drill template; 9. Hollow screw; 10. Radome; 11. Body structure; 12. Support plate nut. DETAILED DESCRIPTION

[0046] The present invention belongs to the field of aviation manufacturing assembly technology and relates to an assembly coordination technology for replacing a radome. The present invention aims to ensure the coaxiality requirements of the radome bolt holes, the fuselage structure bolt holes and the support plate nuts, and formulates corresponding technical schemes, including the determination of the technical schemes, the design of the hole-guiding device and the formulation of the process flow.

[0047] The present invention ensures the coaxiality requirement of the bolt hole of the radome and the bolt hole of the body structure by means of the hollow screw of the hole guiding device, the hole guiding base, the drilling template and the drilling template; after the initial hole is made, the radome is disassembled; the bolt hole is expanded and reamed according to technical conditions by means of an expansion drill and a reamer with a guide rod of φ4mm, so as to meet the assembly quality requirement of the radome.

[0048] The present invention changes the original method of replacing the antenna cover, improves the coordination accuracy between the antenna cover and the bolt holes of the body structure, has a reasonable technical solution, and a feasible process method. It has been verified in practice that the hole-drawing device and the assembly solution of the present invention can meet the technical requirements for replacing the antenna cover.

[0049] The present invention is assembled through the following technical solutions.

[0050] When replacing a new antenna cover, there are problems such as secondary disassembly of the support plate nut and scratches on the hole wall, and difficulty in making holes in a narrow space. A special hole-guiding device is set between the body structure and the antenna cover.

[0051] like Figure 1 , Figure 2 , Figure 3 As shown, the present invention provides a special hole-guiding device, which consists of nine parts: a hole-guiding base 1, a gasket 2, a drilling template 3, a stud 4, a bushing 5, a nut 6, a process screw 7, a drilling template 8, and a hollow screw 9.

[0052] Among them, the guide hole base 1 adopts a stepped structural part, which is made of 45 steel through machining. The thickness of the thin end is 1.5mm. There is a φ8H7mm hole in the center of the front, which is 10mm away from the end edge. The thickness of the thick end is 13mm. There are two M6 threaded holes in the center of the front. The distance between the two holes is greater than 30mm, which can ensure the stability of the drilling template. The verticality of the threaded hole and its end face is ≯0.01mm.

[0053] Among them, the gasket 2 can be selected with different thicknesses according to the different thicknesses of the antenna cover, and is used to adjust the drilling template to ensure parallel fit with the outer surface of the antenna cover.

[0054] Among them, the drilling template 3 adopts a stepped structural part, which is made of 45 steel through mechanical processing. The thickness of the thin end is 10mm. There is a φ10H7 hole in the center of the front, and the hole is 10mm away from the end edge, which is convenient for the working part of the drilling template to be inserted smoothly without shaking. The perpendicularity of the hole to its end face is ≯0.01mm, the thickness of the thick end is 20mm, and there are two holes with a diameter of φ6H7 in the center of the front. The hole position is drilled with the guide hole base 1 to ensure that the coaxiality of the hollow screw axis and the drilling template axis after assembly is ≯0.02mm.

[0055] Among them, stud 4 is a shaft part, with M6 threads at both ends, the diameter of the middle guide part is φ6g6, and the material is made of 45 steel through machining and then quenching. After the two studs are screwed to the bottom plate of the drilling template, the drilling template can be guaranteed to slide along the axis direction of the studs.

[0056] The thickness of the bushing 5 is selected according to the protrusion of the stud polished rod after the drilling template is installed, so as to ensure that the drilling template can be clamped after the nut 6 is tightened.

[0057] Among them, nut 6 is an M6 process nut, which can be tightened or disassembled with the help of a ratchet wrench.

[0058] Among them, the process screw 7 is a suitable M4 screw with a polished rod selected according to the hole-guiding device and the interlayer thickness of the antenna cover to ensure that the antenna cover can be fixedly clamped on the body structure.

[0059] Among them, the drill jig 8 is a stepped shaft part, the small diameter of which matches the drill jig hole diameter of the drill template with a size of φ10H7 / g6, a thickness of 10mm, a diameter of the large diameter part of φ10mm, and a knurled side for easy hand-held processing by the operator. The thickness is 8mm, and a φ4mm through hole is made in the center of the drill jig, and the coaxiality of its axis is ≯0.01mm.

[0060] Among them, the hollow screw 9 stepped shaft parts, the tail of the screw is threaded, its size matches the size of the body structure support plate nut, the length of the screw is selected to ensure that the lead hole base can be accurately fixed and clamped on the surface of the body structure, the head diameter of the screw is φ16mm, the thickness is 1.5mm, and the sum of the thickness after screwing with the lead hole base is just the thickness of the glue layer. The end face is opened through the center of the circle with a depth of 1mm, which can be tightened or disassembled with the help of a screwdriver. The center of the screw is made of M4 threaded through hole, so that the process screw can be screwed in and fixed smoothly.

[0061] In other embodiments of the present application, a process flow provided by the present application is as follows:

[0062] a. Use hollow screws to screw the guide hole base onto the surface of the machine structure;

[0063] b. Position the radome on the surface of the hollow screw according to the assembly hole of the radome;

[0064] c. Assemble the hole-guiding device;

[0065] d. Make a φ4mm initial hole on the antenna cover and fix it with process screws;

[0066] e. After the hole making is completed, the antenna cover and the hole-guiding device are disassembled;

[0067] f. Use a reamer with a φ4mm guide rod to expand the initial hole of the antenna cover to the final hole according to the drawings and technical requirements.

[0068] The present invention provides a hole-guiding device and a replacement method for the radome without removing the support plate nut inside the body structure. The hole-guiding base and hollow screw, stud and drilling template, drilling template and drilling template are all H7 / g6, the coaxiality of shaft parts is ≯0.01mm, the verticality of the stud and the hole-guiding base after installation is ≯0.01mm, and finally the coaxiality of the axis of the hollow screw and the axis of the drilling template after assembly is guaranteed to be ≯0.02mm. Using the drilling template to drill the initial hole of φ4mm better guarantees the verticality and coaxiality of the bolt hole. The alloy steel tool is used to drill the bolt hole of the radome, which can increase the service life of the tool and improve the quality of the bolt hole.

[0069] The research scheme of the antenna cover replacement method of the present invention solves the quality defects such as insufficient bolt connection strength, scratches on the bolt hole wall, and low accuracy of drawing lines and holes in narrow spaces caused by secondary disassembly and assembly of the support plate nut in the past, thereby improving the replacement efficiency of the antenna cover, reducing production costs, and improving the installation quality of the antenna cover.

[0070] In other embodiments of the present application, Figure 1 As shown, the present invention provides a special hole-guiding device, which consists of nine parts: a hole-guiding base 1, a gasket 2, a drilling template 3, a stud 4, a bushing 5, a nut 6, a process screw 7, a drilling template 8, and a hollow screw 9.

[0071] Among them, the guide hole base 1 adopts a stepped structural part, which is made of 45 steel through machining. The thickness of the thin end is 1.5mm, and there is a φ8mm hole in the center of the front, which is 10mm away from the end edge. The thickness of the thick end is 13mm. There are two M6 threaded holes in the center of the front, and the distance between the two holes is greater than 30mm, which can ensure the stability of the drilling template. The verticality of the threaded hole and its end face is ≯0.01mm.

[0072] Among them, the gasket 2 can be selected with different thicknesses according to the different thicknesses of the antenna cover, and is used to adjust the drilling template to ensure parallel fit with the outer surface of the antenna cover.

[0073] Among them, the drilling template 3 adopts a stepped structural part, which is made of 45 steel through mechanical processing. The thickness of the thin end is 10mm. There is a φ10H7 hole in the center of the front, and the hole is 10mm away from the end edge, which is convenient for the working part of the drilling template to be inserted smoothly without shaking. The perpendicularity of the hole to its end face is ≯0.01mm, the thickness of the thick end is 20mm, and there are two holes with a diameter of φ6H7 in the center of the front. The hole position is drilled with the guide hole base 1 to ensure that the coaxiality of the hollow screw axis and the drilling template axis after assembly is ≯0.02mm.

[0074] Among them, stud 4 is a shaft part, with M6 threads at both ends, the diameter of the middle guide part is φ6g6, and the material is made of 45 steel through machining and then quenching. After the two studs are screwed to the bottom plate of the drilling template, the drilling template can be guaranteed to slide along the axis direction of the studs.

[0075] The thickness of the bushing 5 is selected according to the protrusion of the stud polished rod after the drilling template is installed, so as to ensure that the drilling template can be clamped after the nut 6 is tightened.

[0076] The nut 6 is an M6 process nut, which can be tightened or disassembled with the help of a ratchet wrench. The process screw 7 is a suitable M4 screw with a polished rod selected according to the hole-guiding device and the interlayer thickness of the antenna cover to ensure that the antenna cover can be fixedly clamped on the body structure.

[0077] Among them, the drill jig 8 is a stepped shaft part, the small diameter of which matches the drill jig hole diameter of the drill template with a size of φ10H7 / g6, a thickness of 10mm, a diameter of the large diameter part of φ10mm, and a knurled side for easy hand-held processing by the operator. The thickness is 8mm, and a φ4mm through hole is made in the center of the drill jig, and the coaxiality of its axis is ≯0.01mm.

[0078] Among them, the hollow screw 9 stepped shaft parts, the tail of the screw is threaded, its size matches the size of the body structure support plate nut, the length of the screw is selected to ensure that the lead hole base can be accurately fixed and clamped on the surface of the body structure, the head diameter of the screw is φ16mm, the thickness is 1.5mm, and the sum of the thickness after being screwed with the lead hole base is just the thickness of the glue layer. The end face is through the center of the circle with a depth of 1mm. It can be tightened or disassembled with the help of a screwdriver. The center of the screw is made of M4 threaded through hole, which is convenient for the process screw to be screwed in and fixed smoothly.

[0079] See also Figure 4 , Figure 5 , Figure 6 , Figure 7 As shown, in a feasible implementation, the specific operation process provided by this application is as follows:

[0080] ①. Manufacture the various parts of the hole-guiding device according to the drawings and technical requirements;

[0081] ②. Remove the scrapped radome and clean the glue layer on the surface of the fuselage structure with a scraping board;

[0082] ③. Use a screwdriver to pass the hollow screw through the guide hole base and fix it on the surface of the body structure. The surface that fits the product needs to be protected with tape to avoid scratching the product surface. The guide hole device is placed along the normal direction of the antenna cover (the assembly hole of the antenna cover is not installed);

[0083] ④. Open the outer packaging of the new radome, inspect its appearance, check the logbook, protect the non-construction surface, and then hoist the radome onto the work bracket;

[0084] ⑤. Slowly move the radome to 50cm from the surface of the fuselage structure, adjust the position of the radome assembly hole, add a 3mm plastic gasket between the radome and the fuselage surface, and fix the radome to the fuselage surface with process bolts;

[0085] ⑥. Screw the stud into the base of the lead hole, adjust the height of the drilling template with a gasket, ensure that the drilling template is parallel to the outer surface of the antenna cover, install the drilling template on the stud, adjust the extension of the thread with the bushing, and tighten it with a nut. The surface that fits the product needs to be protected with tape;

[0086] ⑦. Check the installation position accuracy and bolt margin of the radome. Loosen the bracket and readjust the position where the margin is not appropriate until the margin is appropriate.

[0087] ⑧ Before drilling, the operator must wear a one-piece dust-proof suit and a dust mask to avoid damage to the human body caused by the fibers;

[0088] ⑨. Use a φ4mm alloy steel drill bit and a drill jig to drill the initial hole of the antenna cover in the drill jig hole on the drill template, and then tighten the drill jig together with the hole guide device with an M4 bolt with a polished rod. Use the same method to make all the initial holes for the bolts;

[0089] ⑩. Loosen the bracket, remove the antenna cover and the hole guide device, use a 4mm φ reamer and reamer to expand and ream the bolt holes according to the technical requirements, and then remove the burrs and chamfer them;

[0090] 11. Clean the bonding surface and the surrounding environment, and glue the antenna cover and the surface of the fuselage structure. The gluing temperature is 15℃~30℃, and the relative humidity is 35%~80%. The glue layer can be trimmed only when the hardness of the glue reaches 30 Shore hardness;

[0091] 12. Use product bolts to screw the radome onto the surface of the fuselage structure to complete the replacement of the radome.

Claims

1. A radome replacement device, characterized in that: The device comprises: The lead hole base has a thin end and a thick end, and the thin end of the lead hole base is provided with a limit hole for the organic support plate nut; A hollow screw is installed in the limiting hole of the body support plate nut, and the hollow screw is used to install the guide hole base on the body structure; wherein the sum of the thickness of the thin end of the guide hole base and the thickness of the head of the hollow screw is equal to the thickness of the adhesive layer on the surface of the body; the hollow screw is coaxial with the limiting hole of the body support plate nut; A drilling template, having a drilling template hole, wherein the drilling template hole is coaxial with the limiting hole of the body support plate nut; wherein the drilling template is connected to the guide hole base; A drilling jig, arranged in the drilling jig hole, the drilling jig being used to drill a hole on the radome; A process screw passes through the jig hole and is connected with the hollow screw to fix the antenna cover on the body structure.

2. The device according to claim 1, characterized in that The thick end of the hole guide base is provided with a threaded hole, the drilling template also has a thick end and a thin end, the drilling template hole is provided at the thin end of the drilling template, and the thick end of the drilling template is provided with a through hole.

3. The device according to claim 2, characterized in that The device also includes: A gasket is arranged between the threaded hole and the through hole, and the gasket is used to adjust the drilling template to ensure that the drilling template is parallel and fits the outer surface of the antenna cover.

4. The device according to claim 3, characterized in that The device also includes: A stud, one end of which passes through the through hole and is connected to the threaded hole; A nut is arranged at the other end of the stud, and the nut is used to lock the drilling template on the guide hole base.

5. The device according to claim 4, characterized in that The device also includes: A bushing is arranged on the stud.

6. A method for replacing a radome, characterized in that: The method comprises: Lift the new radome onto the work bracket; Slowly move the new radome to 50cm from the fuselage surface, adjust the position of the new radome assembly hole, add a 3mm plastic gasket between the new radome and the fuselage surface, and fix the new radome to the fuselage surface with process bolts; Screw the stud into the base of the lead hole, adjust the height of the drilling template with a gasket, ensure that the drilling template is parallel to the outer surface of the new radome, install the drilling template on the stud, adjust the extension of the thread with the bushing, and tighten it with a nut. The surface that fits the product needs to be protected with tape; Check the installation position accuracy and bolt margin of the new radome, loosen the brackets and readjust the parts with inappropriate margin until the margin is appropriate; Use a φ4mm alloy steel drill bit and a drill jig to drill a new antenna cover primary hole in the drill jig hole on the drill template, then use an M4 bolt with a polished rod to tighten the drill jig together on the hole guide device, and use the same method to make all the bolt primary holes; Loosen the bracket, remove the new antenna cover and the hole guide device, use a 4mm φ reamer and reamer to expand and ream the bolt holes according to the technical requirements, and then remove the burrs and chamfer them; Clean the bonding surface and the surrounding environment, and glue the new radome to the surface of the fuselage structure. The glue application temperature is 15℃~30℃, and the relative humidity is 35%~80%. The glue layer can be reshaped only when the hardness of the glue reaches 30 Shore hardness. Use product bolts to screw the new radome onto the surface of the fuselage structure to complete the replacement of the radome.

7. The method according to claim 6, characterized in that Before the new radome is hoisted onto the working bracket, the method further includes: Remove the scrapped radome and clean the glue layer on the surface of the fuselage structure with a scraping board; Use a screwdriver to pass the hollow screw through the guide hole base and fix it on the surface of the body structure. The surface that fits the product needs to be protected with tape to avoid scratching the product surface. The guide hole device is placed along the normal direction of the antenna cover. Open the outer packaging of the new radome, conduct an appearance inspection, check the log book, and protect the non-construction surface.

8. The method according to claim 6, characterized in that The method further comprises: Before drilling, the operator must wear a one-piece dust-proof suit and a dust mask correctly to avoid damage to the human body by fibers.

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