CN112265652B - Maintenance method of aircraft pipe joint - Google Patents
Maintenance method of aircraft pipe joint Download PDFInfo
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- CN112265652B CN112265652B CN202010946897.2A CN202010946897A CN112265652B CN 112265652 B CN112265652 B CN 112265652B CN 202010946897 A CN202010946897 A CN 202010946897A CN 112265652 B CN112265652 B CN 112265652B
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- pipe joint
- conical surface
- pipe
- aircraft
- joint
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64F—GROUND OR AIRCRAFT-CARRIER-DECK INSTALLATIONS SPECIALLY ADAPTED FOR USE IN CONNECTION WITH AIRCRAFT; DESIGNING, MANUFACTURING, ASSEMBLING, CLEANING, MAINTAINING OR REPAIRING AIRCRAFT, NOT OTHERWISE PROVIDED FOR; HANDLING, TRANSPORTING, TESTING OR INSPECTING AIRCRAFT COMPONENTS, NOT OTHERWISE PROVIDED FOR
- B64F5/00—Designing, manufacturing, assembling, cleaning, maintaining or repairing aircraft, not otherwise provided for; Handling, transporting, testing or inspecting aircraft components, not otherwise provided for
- B64F5/40—Maintaining or repairing aircraft
Abstract
The invention provides a maintenance method of an aircraft pipe joint, and belongs to the field of aircraft maintenance. The maintenance method comprises the steps of pipe joint disassembly, cleaning and blow-drying, visual inspection, repair, surface treatment, nondestructive detection, reassembly and the like. Compared with the prior art, the method disclosed by the invention not only can obviously improve the maintenance quality of the joint, but also effectively improve the maintenance efficiency, simultaneously make the maintenance mode more systematic, form pipelining maintenance, strictly control each link of the maintenance and ensure the traceability of the link.
Description
Technical Field
The invention belongs to the field of aircraft maintenance, and particularly relates to a maintenance method for an aircraft pipe joint.
Background
The pipe joint is an important component of an aircraft hydraulic pipeline system and a fuel pipeline system, and the quality of the pipe joint directly determines the performance of the aircraft. The problems caused by the oil pressure of the hydraulic pipeline system of the airplane and the oil pipeline system of the fuel oil are the tasks which are urgently needed to be solved in the engineering field. Damage to any of the pipe joints in the hydraulic or fuel system can cause major accidents in the piping system. Therefore, it is particularly important to repair the aircraft pipe joint.
The maintenance of the pipe joint of the airplane is a busy, long and evolution process flow, and the steps of disassembly, cleaning, inspection, repair and assembly of the pipe joint are effectively and orderly combined in series, so that each detail is strictly controlled, and the maintenance process is orderly, error-free and efficient. However, the maintenance method in the prior art has the defects that the steps are dispersed and independent, the production line cannot be formed, the links of the production process cannot be controlled strictly, a large amount of manpower and material resources are consumed, and the maintenance efficiency is low.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a maintenance method for an aircraft pipe joint, which is high in maintenance efficiency.
The technical scheme of the invention is as follows:
a method of repairing an aircraft pipe joint comprising the steps of:
step 1: decomposing the pipe joint on the single aircraft into independent joints and distinguishing according to the parts;
step 2: cleaning and drying the pipe joints decomposed in the step 1 respectively;
step 3: visual inspection of all pipe joints;
step 4: repairing all pipe joints;
step 5: carrying out surface treatment on all pipe joints;
step 6: nondestructive testing is carried out on all pipe joints; cleaning and drying the pipe joint which is qualified in detection; and (3) sending the obtained qualified pipe joint into an assembly room for assembly, if parts needing to be replaced exist, replacing the qualified pipe joint in the assembly room, and performing system detection after the assembly is completed.
Further, in the step 2, the ultrasonic cleaner CQX-24 is adopted to clean the pipe joint by matching with the 300 cleaning agent, the cleaning time is 5-8 min, and the pipe joint is dried by compressed air after cleaning, so that the maintenance efficiency is greatly improved, and the labor cost is effectively reduced.
Further, in the step 3, the inner conical surface, the outer conical surface, the spherical surface, the thread position, the fuse hole, the non-working surface, the inner hole, the surface plating layer and the like of the pipe joint are visually inspected by matching with a 5-10-time magnifying glass.
In the step 4, the inner conical surface and the outer conical surface of the pipe joint are repaired by an ordinary lathe, the steel pipe joint and the titanium alloy pipe joint are turned and repaired by an H13A cutter block, and the aluminum pipe joint is turned and repaired by an H10 cutter block; the rotating speed of the main shaft is controlled to be 800-1000 rpm when the pipe joint with the specification of less than M12 is repaired, and the rotating speed of the main shaft is controlled to be 500-600 rpm when the pipe joint with the specification of more than M12 is repaired. When the inner conical surface is grinded and repaired, a steel grinding rod is matched with the mixed liquid of 220#/320# grinding sand and engine oil, and the rotating speed of the main shaft is controlled between 300 rpm and 400rpm. The inner conical surface is polished by adopting wool felt and M14 chromium oxide grinding paste, and the rotating speed of the main shaft is controlled between 300 rpm and 400rpm. After repair was completed, the tips were blunted with a assorted file and the tube joints were cleaned with ethyl acetate. Rust marks on the non-working surface are removed by using a hand-held polisher, and the pipe joint is coated with Q14-31 varnish for protection after rust removal. And a damaged fuse hole on the pipe joint is drilled with a new hole on the adjacent edge angle, so that two good fuse holes on the buckling nut are ensured.
Further, in the step 5, the surface treatment coating is subjected to surface treatment according to the original machine parts.
Further, in the step 6, nondestructive detection is performed by adopting fluorescence penetration detection or magnetic particle inspection. The detection result is more accurate, and the maintenance efficiency is also effectively improved.
In step 6, the pipe joint is cleaned twice by using an ultrasonic cleaner CQX25-24 after the nondestructive testing is completed, so as to avoid mixing of redundant substances or impurities in the pipe joint.
Compared with the prior art, the invention not only can remarkably improve the maintenance quality of the joint, but also effectively improve the maintenance efficiency, simultaneously make the maintenance mode more systematic, form pipelining maintenance, strictly control each link of the maintenance and ensure the traceability of the link.
Drawings
FIG. 1 is a flow chart of a maintenance method according to the present invention.
Detailed Description
The following detailed description of the invention is further illustrated in conjunction with the examples and the accompanying drawings, but is not intended to limit the invention.
As shown in fig. 1, a method for repairing an aircraft pipe joint includes the steps of:
step 1: the pipe joint on the single aircraft is divided into independent joints and is distinguished according to the parts, and the pipe joint comprises an engine cabin joint, a mechanical pipe joint, a tail beam joint, an outer wing, a vertical tail joint and the like.
Step 2: and (3) cleaning the pipe joint decomposed in the step (1) by adopting an ultrasonic cleaner CQX-24 and a 300 cleaning agent, cleaning for 5min, and drying by compressed air after cleaning.
Step 3: and (5) visually inspecting the inner conical surface, the outer conical surface, the spherical surface, the thread position, the fuse hole, the non-working surface, the inner hole, the surface coating and the like of all pipe joints by matching with a 5-time magnifying glass.
Step 4: repairing all pipe joints; wherein, the liquid crystal display device comprises a liquid crystal display device,
repairing the inner conical surface and the outer conical surface of the pipe joint by an ordinary lathe, turning the outer conical surface by using an H13A cutter block for a steel pipe joint and a titanium alloy pipe joint, and turning the outer conical surface by using an H10 cutter block for an aluminum pipe joint; the rotation speed of the main shaft is 1000rpm when the pipe joint with the specification of less than M12 is repaired, and the rotation speed of the main shaft is 600rpm when the pipe joint with the specification of more than M12 is repaired. The inner conical surface is polished and repaired by adopting a steel grinding rod and a 220# grinding sand and engine oil mixed solution, the rotating speed of a main shaft is 400rpm, and the inner conical surface is polished and repaired by adopting a wool felt and an M14 chromium oxide grinding paste, and the rotating speed of the main shaft is 400rpm. After repair, the tip of the assorted file is blunted, and the pipe joint is cleaned by ethyl acetate and dried by compressed air. Rust marks on the non-working surface are removed by using a hand-held polisher, and the pipe joint is coated with Q14-31 varnish for protection after rust removal. And a damaged fuse hole on the pipe joint is drilled with a new hole on the adjacent edge angle, so that two good fuse holes on the buckling nut are ensured.
Step 5: and carrying out surface treatment on all the pipe joints according to the original machine part state.
Step 6: and carrying out nondestructive detection on all pipe joints, wherein the nondestructive detection adopts magnetic particle inspection for detection. After the nondestructive testing is finished, the ultrasonic cleaner CQX25-24 is adopted to clean the pipe joint for the second time and blow-dry the pipe joint by compressed air, so that the mixing of redundant substances or impurities in the pipe joint can be avoided. And (3) conveying the pipe joint which is qualified in repair into an assembly room for assembly, and if parts needing to be replaced exist, replacing the pipe joint in the assembly room, and performing system detection after the assembly is completed.
When checking the non-working surface of the pipe joint, slight scratches are allowed, the scratch depth being not more than 0.3mm (joints with wall thickness greater than 2mm, should not be more than 0.5 mm). The first button of the thread of the coupling is allowed to fail and the remaining threads are allowed to have slight indentations or damage. In the process of checking and repairing the pipe joint, flaw detection is carried out when suspected flaws are found.
When the internal and external conical surfaces are machined and ground, the fixture is used for clamping on the premise that the assembly and the use strength are not affected, the circle run-out is ensured to be less than or equal to 0.05mm, and the original length of the threads is ensured by the machining. And a fillet R0.2mm is formed at the sharp edge of the conical surface after the turning. The angle of the outer conical surface of the pipe joint ensures 74 degrees plus or minus 30 degrees, and the roughness requirement of the conical surface is Ra0.8.
The assembly pipe joint with the spherical surface is repaired in a disassembled mode, a threaded tire is used for tightly buckling and pressing the screw cap, and the spherical pipe joint is repaired after the screw cap is taken down by cutting off the compression section. Rust marks on the non-working surface are removed by using a hand-held polisher, and the polished and removed pipe joint is coated with varnish Q14-31 for protection. Rust marks in the withhold nuts are removed by using tools in combination with 800# abrasive paper. The common surface treatments for aircraft pipe joints are cadmium-plated phosphate oxidation and zinc-plated phosphate oxidation.
The method provided by the invention forms pipelining maintenance, so that the maintenance mode is more systematic, each link of maintenance can be strictly controlled, the maintenance efficiency is effectively improved, and the maintenance quality is obviously improved.
Claims (3)
1. A method of repairing an aircraft pipe joint, the method comprising the steps of:
step 1: the pipe joint on the single aircraft is divided into independent joints and is distinguished according to parts, and the pipe joint comprises an engine compartment joint, a mechanical pipe joint, a tail beam joint, an outer wing and a vertical tail joint;
step 2: cleaning the pipe joints decomposed in the step 1 by adopting an ultrasonic cleaner matched with a cleaning agent for 5-8 min, and drying by compressed air after cleaning;
step 3: adopting a 5-10 times magnifying glass to visually inspect the inner conical surface, the outer conical surface, the spherical surface, the thread position, the fuse hole, the non-working surface, the inner hole and the surface coating of all pipe joints;
step 4: repair all pipe joints: repairing the inner conical surface and the outer conical surface of the pipe joint by a lathe, turning the outer conical surface by using an H13A cutter block for a steel pipe joint and a titanium alloy pipe joint, and turning the outer conical surface by using an H10 cutter block for an aluminum pipe joint; the rotation speed of the main shaft is 800-1000 rpm when the pipe joint with the specification of less than M12 is repaired, and the rotation speed of the main shaft is 500-600 rpm when the pipe joint with the specification of more than M12 is repaired; when the inner conical surface is grinded and repaired, a steel grinding rod is matched with the mixed liquid of 220# or 320# grinding sand and engine oil for grinding and repairing, and the rotating speed of a main shaft is 300-400 rpm; when the inner conical surface is polished, wool felt is adopted to match with M14 chromium oxide grinding paste for polishing and repairing, and the rotating speed of a main shaft is 300-400 rpm;
after repair is completed, the tip of the assorted file is dulled and the pipe joint is cleaned by ethyl acetate; rust marks on the non-working surface are removed by using a handheld polisher, and the pipe joint is coated with varnish for protection after rust removal; a damaged fuse hole on the pipe joint is drilled with a new hole on the adjacent edge angle;
step 5: carrying out surface treatment on all pipe joints according to the original machine part state, wherein the surface treatment mode is cadmium-plated phosphate oxidation or zinc-plated phosphate oxidation;
step 6: all pipe joints are detected by adopting fluorescence penetration detection or magnetic particle inspection; and after the detection is finished, the pipe joint is subjected to secondary cleaning by adopting an ultrasonic cleaner and is dried by compressed air.
2. The method for repairing the aircraft pipe joint according to claim 1, wherein the fixture is used for clamping when the inner conical surface and the outer conical surface of the aircraft pipe joint are machined and grinded, so that the circle run-out is less than or equal to 0.05mm, and the original length of the thread is ensured when the aircraft pipe joint is machined; a round angle R0.2mm is manufactured at the sharp edge of the conical surface after the turning; the angle of the outer conical surface of the pipe joint ensures 74 degrees plus or minus 30 degrees, and the roughness requirement of the conical surface is Ra0.8.
3. A method of repairing an aircraft pipe fitting according to claim 1 or claim 2, wherein the assembly pipe fitting having the spherical surface is repaired by disassembly, the nut is tightened using a threaded tire, and the spherical surface pipe fitting is repaired after the nut is removed by cutting the crimp section; rust marks in the withhold nuts are removed by using tools in combination with 800# abrasive paper.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010946897.2A CN112265652B (en) | 2020-09-10 | 2020-09-10 | Maintenance method of aircraft pipe joint |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010946897.2A CN112265652B (en) | 2020-09-10 | 2020-09-10 | Maintenance method of aircraft pipe joint |
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| CN112265652A CN112265652A (en) | 2021-01-26 |
| CN112265652B true CN112265652B (en) | 2023-05-26 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105173115A (en) * | 2015-04-23 | 2015-12-23 | 南京王行航空附件维修工程有限公司 | Method for maintaining airplane wheel assembly of airplane landing gear |
| WO2017151082A1 (en) * | 2016-03-01 | 2017-09-08 | Podrieza Serhii | Method of on-condition repair and modernization up-dating of an aircraft hydraulic system |
| CN108860656A (en) * | 2018-07-28 | 2018-11-23 | 国营芜湖机械厂 | A kind of plane aluminium alloy structural member crackle cold spraying reinforcement repair method |
| CN110844108A (en) * | 2019-11-22 | 2020-02-28 | 上海航翼高新技术发展研究院有限公司 | Repairing tool and repairing method for fluoroplastic valve port of airplane pressure reducer component |
| CN210761367U (en) * | 2019-09-19 | 2020-06-16 | 成都飞机工业（集团）有限责任公司 | Pipe joint conical surface repairing tool |
-
2020
- 2020-09-10 CN CN202010946897.2A patent/CN112265652B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105173115A (en) * | 2015-04-23 | 2015-12-23 | 南京王行航空附件维修工程有限公司 | Method for maintaining airplane wheel assembly of airplane landing gear |
| WO2017151082A1 (en) * | 2016-03-01 | 2017-09-08 | Podrieza Serhii | Method of on-condition repair and modernization up-dating of an aircraft hydraulic system |
| CN108860656A (en) * | 2018-07-28 | 2018-11-23 | 国营芜湖机械厂 | A kind of plane aluminium alloy structural member crackle cold spraying reinforcement repair method |
| CN210761367U (en) * | 2019-09-19 | 2020-06-16 | 成都飞机工业（集团）有限责任公司 | Pipe joint conical surface repairing tool |
| CN110844108A (en) * | 2019-11-22 | 2020-02-28 | 上海航翼高新技术发展研究院有限公司 | Repairing tool and repairing method for fluoroplastic valve port of airplane pressure reducer component |
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| CN112265652A (en) | 2021-01-26 |
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