CN115496240A - Method for repairing damaged casing of helicopter speed reducer casing - Google Patents

Method for repairing damaged casing of helicopter speed reducer casing Download PDF

Info

Publication number
CN115496240A
CN115496240A CN202211169894.8A CN202211169894A CN115496240A CN 115496240 A CN115496240 A CN 115496240A CN 202211169894 A CN202211169894 A CN 202211169894A CN 115496240 A CN115496240 A CN 115496240A
Authority
CN
China
Prior art keywords
casing
damage
repair
damaged
repairing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202211169894.8A
Other languages
Chinese (zh)
Inventor
徐秀波
胡克伟
徐童童
齐晓辉
刘一鸣
田立敏
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
AECC Harbin Dongan Engine Co Ltd
Original Assignee
AECC Harbin Dongan Engine Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by AECC Harbin Dongan Engine Co Ltd filed Critical AECC Harbin Dongan Engine Co Ltd
Priority to CN202211169894.8A priority Critical patent/CN115496240A/en
Publication of CN115496240A publication Critical patent/CN115496240A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
    • G06Q10/00—Administration; Management
    • G06Q10/20—Administration of product repair or maintenance
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
    • G06F30/20—Design optimisation, verification or simulation
    • G06F30/23—Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]
    • G—PHYSICS
    • G16—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR SPECIFIC APPLICATION FIELDS
    • G16C—COMPUTATIONAL CHEMISTRY; CHEMOINFORMATICS; COMPUTATIONAL MATERIALS SCIENCE
    • G16C60/00—Computational materials science, i.e. ICT specially adapted for investigating the physical or chemical properties of materials or phenomena associated with their design, synthesis, processing, characterisation or utilisation
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2113/00—Details relating to the application field
    • G06F2113/26—Composites
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
    • G06F2119/14—Force analysis or force optimisation, e.g. static or dynamic forces

Landscapes

  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Business, Economics & Management (AREA)
  • Human Resources & Organizations (AREA)
  • Computing Systems (AREA)
  • General Physics & Mathematics (AREA)
  • Marketing (AREA)
  • Economics (AREA)
  • Tourism & Hospitality (AREA)
  • Quality & Reliability (AREA)
  • General Business, Economics & Management (AREA)
  • Operations Research (AREA)
  • Entrepreneurship & Innovation (AREA)
  • Strategic Management (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Bioinformatics & Cheminformatics (AREA)
  • Bioinformatics & Computational Biology (AREA)
  • Computer Hardware Design (AREA)
  • Evolutionary Computation (AREA)
  • Geometry (AREA)
  • General Engineering & Computer Science (AREA)
  • Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)

Abstract

The invention belongs to the field of mechanical mechanism repair, and particularly relates to a repair method for damage of a casing of a speed reducer of a helicopter, which distinguishes damage forms caused by different damage forms to the casing through classification of damage properties; determining the influence degree of the damage on the performance of the casing by combining the specific stress level born by the damage at the specific distribution position on the surface of the casing and the surface treatment requirement; the repair is made by distinguishing damage that affects strength and performance. The method provided by the invention can be used for rapidly and accurately analyzing the damaged part of the casing of the speed reducer casing of the helicopter, finishing the repair work of availability, and rapidly solving the problem in a targeted manner after the product has a problem, thereby ensuring the service performance and the use safety of the product.

Description

Method for repairing damaged casing of helicopter speed reducer casing
Technical Field
The invention belongs to the technical field of shell part damage repairing methods, and relates to a method for repairing damage of a shell of a helicopter speed reducer casing.
Background
The casing for the speed reducer in the helicopter transmission system is mostly a magnesium or aluminum alloy forging casing, is an important component of the speed reducer, has the functions of supporting internal moving parts, transmitting supporting force, fixing the speed reducer and the helicopter, and bearing and transmitting all loads generated by a rotor wing, a tail rotor and the like of the helicopter in work. According to the use characteristics of the helicopter speed reducer casing, the casing is required to have higher requirements on strength and performance indexes when being designed, and the requirements on the performance indexes of a forging casting are also extremely high. In service use of the product, the surface of the casing of the speed reducer is damaged due to various reasons, particularly under external impact, the damage is in various forms and is distributed on different surfaces of the casing, and the damage can reduce the use performance of the casing and affect the use safety of the helicopter.
In the prior art, a perfect flow, a judgment standard and a repair method are lacked for repairing a casing of a speed reducer, the casing is directly used or scrapped after being damaged, and potential safety hazards or resource waste possibility exists.
Disclosure of Invention
The purpose of the invention is as follows: the method judges the influence degree of damage by classifying the damage property and combining the structure and the use characteristics of the damaged part of the casing, and provides a repair scheme after the casing is damaged according to the specific condition of the damage.
The technical scheme of the invention is as follows:
a damage repairing method for a casing of a helicopter speed reducer casing is characterized in that damage forms of casing casings caused by different damage forms are distinguished through classifying damage properties; determining the influence degree of the damage on the performance of the casing by combining the specific stress level born by the damage at the specific distribution position on the surface of the casing and the surface treatment requirement; and distinguishing damage influencing the strength and the service performance, and giving a repair scheme.
Preferably, the method comprises the following steps:
step 1, judging the damage form of the surface of a casing of a helicopter speed reducer casing, and determining the damage reason;
step 2, determining the material and surface treatment requirements of the casing;
step 3, determining the size of the damaged part;
step 4, preliminarily judging the feasibility of damage repair;
step 5, calculating the stress level of the damaged part;
step 6, judging the feasibility of damage repair;
step 7, repairing the damaged part;
step 8, analyzing the stress level of the repaired casing under the size;
and 9, judging that the repaired casing meets the use requirement.
Preferably, in step 1, the damage form and damage cause of the surface of the casing of the helicopter speed reducer casing include:
(a) Defects of casing raw materials;
(b) Serious damage caused by that the strength and the performance of the casing can not meet the use requirements;
(c) The casing body is broken and damaged due to manual operation errors;
(d) The surface of the casing body of the casing is knocked and damaged due to impact of foreign objects, and the damaged surface is in a pressure loss shape;
(e) The surface of the casing body is scratched due to contact of foreign objects, and the scratched surface is in a scratch shape;
(f) The abnormal use environment causes the surface of the casing to be corroded, and the damaged surface is in a corrosive shape.
Preferably, in the step 2, the casing material is a casting or a forging of a magnesium alloy or an aluminum alloy material, the surface treatment requirement is chromate or anodization, and the surface protection is performed by selecting priming paint and finish paint as a protective layer.
Preferably, in step 3, a measuring tool is used to measure the actual length, width and depth dimension information of the damaged part.
Preferably, in step 4, a preliminary judgment on the feasibility of damage repair is carried out, and for the cracks and fracture defects which cause the casing to lose the use purpose, the casing is judged to be a non-repairable part and is directly scrapped; judging the mild damage of the collision injury, the scratch and the surface layer corrosion as a repairable part; for the moderate damage, the follow-up analysis of repairing can not be judged through the damage appearance.
Preferably, in step 5, the stress level of the damaged portion is calculated according to the damage degree, specifically, a finite element or numerical analysis method is adopted to calculate the stress distribution condition of the damaged casing, or related design original data is consulted to confirm the stress level of the damaged portion, so as to be used for making a damage repair plan.
Preferably, in step 6, the damage repair is limited by a safety factor, and the repair is performed within the allowable range of the safety factor.
Preferably, step 7 specifically comprises the following steps:
(a) According to the requirement of the surface roughness of the casing, a tool is adopted to polish and repair the surface of the casing to remove sharp edges and burrs of a damaged part, the polishing and repairing size is selected to be 20-50 times of the size of a damaged area, the depth size does not exceed the damage depth, and the undamaged surface is protected during polishing and repairing;
(b) The casing is subjected to damage judgment by combining with a casing material in a nondestructive flaw detection mode, and the casing material is magnesium or aluminum alloy, so that local fluorescence treatment is selected to judge whether the surface before and after damage repair has serious defects or not;
(c) And after the nondestructive inspection is qualified, performing local surface protection treatment and paint coating treatment on the repaired part of the casing according to design requirements.
Preferably, in step 8, for the repair of the key part of the casing with a large repair size, the stress level analysis of the casing with the actual size after the repair is carried out, and the stress safety coefficient after the repair meets the design requirement.
The invention has the beneficial effects that: the invention provides a specific implementation method for repairing damage of a casing of a speed reducer casing of a helicopter, which comprises the steps of classifying damage reasons, judging damage forms, judging damage influences, and a specific damage repairing method and the like. The method provided by the invention can be used for rapidly and accurately analyzing the damaged part of the casing of the gearbox of the helicopter, finishing the repair work with availability, and rapidly solving the problem in a targeted manner after the product has a problem, thereby ensuring the service performance and the use safety of the product.
Drawings
FIG. 1 is a flow chart of a method for repairing damaged casing of a helicopter speed reducer according to the present invention.
Detailed Description
The following detailed description of the embodiments of the present invention, such as the shapes, configurations, mutual positions and connection relationships of the components, the functions and operating principles of the components, the manufacturing processes and the operation and use methods thereof, will be further described in detail with reference to the accompanying drawings, so as to help those skilled in the art to more completely, accurately and deeply understand the concept and technical solutions of the present invention:
the damage repairing method of the casing of the helicopter speed reducer casing is used for carrying out targeted damage repairing after classification aiming at different damage forms, thereby avoiding the quality hidden trouble caused by blind repairing and greatly improving the repairing efficiency and the use safety of the damaged casing.
The specific implementation process of the invention is as follows:
1) The damaged surface morphology is judged, the cause of the casing damage is determined, and the damaged surface morphology can be roughly searched according to the following types:
(a) The defects of the casing raw material are generally expressed as looseness, air holes, impurities, shrinkage cavities and the like;
(b) Serious damage such as cracks caused by the fact that the strength, the performance and the like of the casing do not meet the use requirements;
(c) The casing body is broken and damaged due to manual operation errors;
(d) The surface of the casing body of the casing is knocked and damaged due to impact of foreign objects, and the damaged surface is in a pressure loss shape;
(e) The surface of the casing body is scratched due to contact of foreign objects, and the damaged surface is in a scratch shape;
(f) The abnormal use environment causes the surface of the casing to be corroded, and the damaged surface is in a corroded shape. .
2) And looking up related technical data to determine the design requirements of materials, surface treatment, painting and the like of the damaged casing. The casing of the helicopter speed reducer is mostly made of a casting or a forging made of magnesium alloy or aluminum alloy. The surface treatment is mostly chromate or anodization, and the surface protection is selected to be a protective layer of priming paint and finish paint.
3) And measuring the actual length, width and depth of the damaged part by using a measuring tool.
4) After the steps 1), 2) and 3) are finished, carrying out primary judgment on the feasibility of damage repair, judging that the cartridge receiver is an unrepairable part for the defects of cracks, fractures and the like which cause the cartridge receiver to lose the use, and directly scrapping the cartridge receiver; and judging the light damage such as collision damage, scratch, surface layer corrosion and the like as a repairable part. And (4) for the moderate damage, judging whether the damage is repaired or not through the damage shape, and carrying out subsequent analysis according to the following steps.
5) And selectively calculating the stress level of the damaged part according to the damage degree. And calculating the stress distribution condition of the damaged casing by adopting a mature finite element or numerical analysis method, or looking up related original design data to confirm the stress level of the damaged part for making a damage repair scheme.
6) The feasibility of damage repair is determined. In principle, repairs are acceptable within the safety margin of use, and can be carried out as follows.
7) And (3) repairing the damaged part of the casing body which is judged to be repairable:
(a) Selecting a proper tool to polish and repair the surface of the casing according to the requirement of the surface roughness of the casing, removing sharp edges and burrs of a damaged part, selecting a range of 20-50 times of the size of a damaged area generally for polishing and repairing, wherein the depth size does not exceed the damaged depth, and protecting the undamaged surface during polishing and repairing;
(b) The damage of the casing is judged by selecting a nondestructive inspection mode according to the casing material, and the magnesium and aluminum alloy are generally subjected to local fluorescence treatment to judge whether cracks and other serious defects exist on the surfaces before and after damage repair;
(c) And after the nondestructive inspection is qualified, performing local surface protection treatment and paint coating treatment on the repaired part of the casing according to the original design requirement.
8) And for repairing the key part of the casing with larger repair size, analyzing the stress level of the casing with the repaired actual size, and ensuring that the stress safety coefficient after repair meets the design requirement. Damage to the low stress region is generally mild and handled without this step.
9) And after the steps are completed, judging that the repair of the casing body meets the use requirement.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention.
Examples
A certain helicopter speed reducer casing is fixed with a helicopter body through four mounting legs, and the mounting legs bear all loads of a helicopter rotor wing, are key parts of the casing and are large stress areas. In the actual use process, the rear leg web part of the casing is damaged, and the repairing method is implemented according to the following steps:
1. determining the damage cause because the back leg rib plate is fleshy and interferes with the fire-proof cover of the whole machine, so that the casing is rubbed and damaged;
2. determining that the casing material is a magnesium alloy casing, performing surface chromate treatment and painting protection;
3. size of the damaged part: the depth is 0.44mm, and the area is 3mm multiplied by 2.5mm;
4. the damage degree is lighter, and the preliminary judgment can be used for repairing. But damage is located in a large load area of the casing body, the strength of the casing is influenced, and stress calculation is carried out to judge whether the casing can be repaired or not.
5. And simulating the three-dimensional appearance of the damaged part by adopting an effective element method, and performing calculation after a three-dimensional model is created.
6. The stress of the damaged part can be calculated to meet the design requirement, and the repairing can be carried out.
7. Repairing the damaged part of the casing, wherein the process comprises the following steps:
(a) Before repairing, paying attention to protect other surfaces of the casing and covering the casing to prevent dust and dirt from entering the casing;
(b) And casting the surface of the casing, and repairing by using No. 240 sand paper, wherein the repairing direction is along the extending direction of the rib plate.
(c) The repair depth of the damaged part of the rib plate is not more than 0.44mm, the damaged part is taken as the center of a circle, the repair is carried out within the range of radius R30mm to R40mm, and the rib plate is smoothly connected with the peripheral surface.
(d) Local fluorescent inspection is carried out after repair, and whether the defects such as surface cracks exist is judged;
(e) The repaired area is chromated and repainted with paint protection as required by the design.
The invention has been described above with reference to the accompanying drawings, it is obvious that the invention is not limited to the specific implementation in the above-described manner, and it is within the scope of the invention to apply the inventive concept and solution to other applications without substantial modification.

Claims (10)

1. A damage repairing method for a casing of a helicopter speed reducer casing is characterized in that damage forms caused by different damage forms to the casing are distinguished by classifying damage properties; determining the influence degree of the damage on the performance of the casing by combining the specific stress level born by the damage at the specific distribution position on the surface of the casing and the surface treatment requirement; and distinguishing damage influencing the strength and the service performance, and giving a repair scheme.
2. A method as claimed in claim 1, wherein said method comprises the steps of:
step 1, judging the damage form of the surface of a casing of a helicopter speed reducer casing, and determining the damage reason;
step 2, determining the material and surface treatment requirements of the casing;
step 3, determining the size of the damaged part;
step 4, preliminarily judging the feasibility of damage repair;
step 5, calculating the stress level of the damaged part;
step 6, judging the feasibility of damage repair;
step 7, repairing the damaged part;
step 8, analyzing the stress level of the repaired casing under the size;
and 9, judging that the repaired casing meets the use requirement.
3. The method according to claim 2, wherein the damage form and the damage cause of the casing surface of the helicopter speed reducer casing in step 1 comprise:
(a) Defects of casing raw materials;
(b) Serious damage caused by that the strength and the performance of the casing can not meet the use requirements;
(c) The casing body is broken and damaged due to manual operation errors;
(d) The surface of the casing body of the casing is knocked and damaged due to impact of foreign objects, and the damaged surface is in a pressure loss shape;
(e) The surface of the casing body is scratched due to contact of foreign objects, and the damaged surface is in a scratch shape;
(f) The abnormal use environment causes the surface of the casing to be corroded, and the damaged surface is in a corrosive shape.
4. The method for repairing damage to a casing of a speed reducer casing of a helicopter of claim 2, wherein in step 2, the casing is made of a casting or forging made of magnesium alloy or aluminum alloy, the surface treatment is chromate or anodization, and the surface protection is selected from primer coating and finish coating as a protective layer.
5. A helicopter speed reducer casing damage repair method according to claim 2, characterized by that in step 3, the actual length, width, depth dimension information of the damaged portion is measured using a measuring tool.
6. The method for repairing damage to a casing of a helicopter retarder casing according to claim 2, wherein in step 4, a preliminary judgment on the feasibility of damage repair is made, and a damage that has caused the casing to lose its use, such as a crack, a fracture defect, is judged as an unrepairable part and is directly discarded; judging the minor damage of collision injury, scratch and surface layer corrosion as a repairable part; for the moderate damage, the follow-up analysis of repairing can not be judged through the damage appearance.
7. The method according to claim 2, wherein in step 5, the stress level of the damaged portion is calculated according to the damage degree, specifically, a finite element or numerical analysis method is used to calculate the stress distribution of the damaged portion, or the related original design data is consulted to confirm the stress level of the damaged portion for making a damage repair plan.
8. The method for repairing damage to a casing of a helicopter speed reducer casing according to claim 2, wherein in step 6, the damage repair is bounded by a safety factor of use, and the repair is performed within a range allowed by the safety factor of use.
9. A method as claimed in claim 2, wherein step 7 comprises the following steps:
(a) According to the requirement of the surface roughness of the casing, a tool is adopted to polish and repair the surface of the casing to remove sharp edges and burrs of a damaged part, the polishing and repairing size is selected to be 20-50 times of the size of a damaged area, the depth size does not exceed the damage depth, and the undamaged surface is protected during polishing and repairing;
(b) The casing is subjected to damage judgment in a nondestructive flaw detection mode by combining casing materials, wherein the casing materials are magnesium and aluminum alloy, so that local fluorescence treatment is selected to judge whether the surfaces before and after damage repair have serious defects;
(c) And after the nondestructive inspection is qualified, performing local surface protection treatment and paint coating treatment on the repaired part of the casing according to the design requirement.
10. The method of claim 2, wherein in step 8, for the repair of the critical portion of the casing having a larger repair size, the stress level analysis of the casing under the actual size after repair is performed to ensure that the stress safety factor after repair meets the design requirements.
CN202211169894.8A 2022-09-23 2022-09-23 Method for repairing damaged casing of helicopter speed reducer casing Pending CN115496240A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202211169894.8A CN115496240A (en) 2022-09-23 2022-09-23 Method for repairing damaged casing of helicopter speed reducer casing

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202211169894.8A CN115496240A (en) 2022-09-23 2022-09-23 Method for repairing damaged casing of helicopter speed reducer casing

Publications (1)

Publication Number Publication Date
CN115496240A true CN115496240A (en) 2022-12-20

Family

ID=84470310

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202211169894.8A Pending CN115496240A (en) 2022-09-23 2022-09-23 Method for repairing damaged casing of helicopter speed reducer casing

Country Status (1)

Country Link
CN (1) CN115496240A (en)

Similar Documents

Publication Publication Date Title
Yang et al. Surface finishing theory and new technology
CN106925961B (en) A kind of vehicle bridge remanufactures production method
US6955100B1 (en) Method and arrangement for inspection and requalification of vehicles used for transporting commodities and/or hazardous materials
US7676897B2 (en) Process of refurbishing brake components
CN104014903A (en) Manual arc welding repair method for centrifugal blower after impeller blade abrasion
CN115570329A (en) Method and device for repairing damage of shaft box installation surface
CN101850490B (en) Rudder pintle bearing body repairing process based on metal repairing agent casting
CN115496240A (en) Method for repairing damaged casing of helicopter speed reducer casing
CN111842401A (en) Remanufacturing production method of transmission
JP2009090460A (en) Method and system for restoring parent metal properties across welds
Sharp et al. Fatigue life recovery in aluminium alloy aircraft structure
Sütőová et al. Creation of defects catalogue for nonconforming product identification in the foundry organization
CN115077823B (en) Vibration fatigue test device and vibration fatigue test method for reducing invalid parts
US20110308290A1 (en) Method for ultrasonic peening of gas turbine engine components without engine disassembly
CN112658612B (en) Manufacturing and detecting process method of nuclear main pump piston ring of nuclear power station
CN115074719A (en) Composite repairing method for cracks around holes of ordnance casting integral part based on cold spraying additive
CN117057082A (en) Maintenance limit size design method, maintenance inspection method, and storage medium
CN110509152B (en) Turbine blade exhaust edge processing method
CN110561029A (en) Method for repairing bearing hole of speed reducer shell
CA2386137C (en) Method and arrangement for inspection and requalification of vehicles used for transporting commodities and/or hazardous materials
Nandagopal et al. Review on ferrous and non-ferrous casting defects and their analysis
CN106493565B (en) Process method for overhauling and reassembling wheel-mounted brake disc of motor train unit
Armitage Development of cast node joints for offshore production platforms
Chaudhary Shot peening: process, equipment and applications
EP4012389A1 (en) Method for evaluating rotor-mast fatigue damage

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination