CN105173115A - Method for maintaining airplane wheel assembly of airplane landing gear - Google Patents
Method for maintaining airplane wheel assembly of airplane landing gear Download PDFInfo
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- CN105173115A CN105173115A CN201510601322.6A CN201510601322A CN105173115A CN 105173115 A CN105173115 A CN 105173115A CN 201510601322 A CN201510601322 A CN 201510601322A CN 105173115 A CN105173115 A CN 105173115A
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Abstract
The invention discloses a method for maintaining an airplane wheel assembly of an airplane landing gear. The method comprises the following steps: step 1, disassembling the airplane wheel assembly of the airplane landing gear into independent accessories; step 2, cleaning and blow-drying the disassembled accessories; step 3, coating a paint remover on the accessories needing to remove paint, classifying the accessories coated by paint remover into aluminum alloy accessories and steel accessories, and removing paint by matching with a plurality of dry sand-blasting machines; step 4, carrying out visual inspection; step 5, carrying out nondestructive testing; if the accessories are qualified, cleaning and blow-drying all the accessories; step 6, sending the nondestructive accessories needing to spray paint into a paint spraying chamber for paint spraying; putting the accessories subjected to paint spraying into a drying box for drying; cleaning and blow-drying the dried accessories; step 7, sending the cleaned and blow-dried accessories to an assembly room for assembly; if a part needing to be replaced exists, replacing the part in the assembly room; after assembly, sending the accessories to a testing area for detection. By adopting the method, the maintenance efficiency is improved, and streamlining maintenance is formed.
Description
Technical field
The invention belongs to aircraft component maintenance field, particularly a kind of method for maintaining for undercarriage wheel assemblies.
Background technology
Alighting gear be aircraft bottom for take off landing or ground taxi time support aircraft and for the accessories apparatus of ground moving.Alighting gear is unique a kind of parts supporting whole airplane, and therefore it is the inseparable scarce some of aircraft; Without it, aircraft just can not at ground moving.After taking off, alighting gear can be regained depending on aeroplane performance.
Aircraft is when rising and falling, impulsive force suffered by alighting gear wheel assemblies is larger, therefore the most easily damage, wherein main stressed member is suitable for as inside and outside half wheel hub, strength bolts, drive block etc. all should adopt and meets the defects detecting technology that ASTM (American Society Testing and Materials) relevant criterion requires, therefore just seems especially for the maintenance of alighting gear important.
The maintenance of undercarriage wheel assemblies is the technological process of busy, very long a, evolution, the decomposition of alighting gear wheel assemblies, cleaning, inspection, repairing, the combination of assembling each step effective, orderly must be together in series, strict control is each details wherein, make maintenance process orderly, errorless, complete efficiently.But the dispersion of the method for maintaining of prior art each processing step is independent, can not forms pipelining and produce, the control that the links of production technology can not be effectively strict, consume a large amount of human and material resources resource, maintenance efficiency is low.
Summary of the invention
Goal of the invention: the present invention is in order to overcome the deficiencies in the prior art, and the present invention proposes the high method for maintaining for undercarriage wheel assemblies of a kind of maintenance efficiency.
Summary of the invention: for solving the problems of the technologies described above, the invention provides a kind of method for maintaining of undercarriage wheel assemblies, comprises the following steps:
Step 1: the wheel assemblies of undercarriage is decomposed into each independently accessory in resolver;
Step 2: respectively the accessory decomposited in step 1 is cleaned, and dry up;
Step 3: will cleaning and dry up rear needs the accessory of paint removal coats depaint agent, is divided into aluminum alloy accessory and steel fitting two class, and coordinates multiple stage dry type sanding machine to carry out the operation of paint removal by accessory;
Step 4: visual inspection is carried out to all accessories;
Step 5: non-destructive test is carried out to all accessories; Qualified all accessories are carried out cleaning and drying up if detected;
Step 6: the accessory sprayed paint by harmless needs is sent into paint spray booth and sprayed paint, and puts into drying baker and dries, carry out cleaning and dry up after oven dry after spraying paint;
Step 7: by obtain in step 5 without the need to obtain in the accessory that sprays paint and step 6 spray paint after accessory be fed through erecting shop and assemble, the part changed if necessary, changes at erecting shop, has assembled rear feeding test section and has detected.
Further, the depaint agent adopted in described step 3 is PR3500 neutral paint stripper; Dry type sanding machine has 3, and wherein two dry type sanding machinees for aluminum alloy accessory use the resin sand of 3.5MOH to carry out paint removal as abrasive material, and another dry type sanding machine for steel fitting uses white fused alumina as abrasive material; Blasting pressure 0.2-0.6MPa.Sample substantially increases maintenance efficiency, effective condition human cost.
Further, the non-destructive test described in step 5 adopts fluorescent penetrant detection line or magnaflux to detect.The result of adhering to like this is more accurate, also effectively raises the efficiency of maintenance.
Further, use rotating disk double wheel hub that spray paint to spray paint at paint spray booth in described step 6, in paint spray booth, use dust removal mist system simultaneously.Make the paint layer from surface effect of product more smooth, smooth, even, glossy comparatively before like this.
Further, in step 6, described half wheel hub is sprayed paint and comprises the following steps:
Step 601: priming paint CA7233 is sprayed on half wheel hub; And natural seasoning at 18 ~ 29 DEG C 30 minutes, then at 49 DEG C of temperature dry 30 minutes;
Step 602: finish paint CA8201 is sprayed on half wheel hub, and natural seasoning 30 minutes at 18 ~ 29 DEG C, then at 60 ~ 80 DEG C of temperature dry 60 minutes.Effective like this time saving drying, thus improve the efficiency of maintenance.
Beneficial effect: compared with prior art, the present invention can not only find the place needed repairing accurately, and effectively raise the efficiency of maintenance, save human and material resources resource, make maintenance mode systematization more simultaneously, define pipelining maintenance, strict control can be carried out to each link of maintenance.
Accompanying drawing explanation
Fig. 1 is the diagram of circuit of method for maintaining provided by the invention.
Detailed description of the invention
Below in conjunction with accompanying drawing, technical scheme of the present invention is further explained.
As shown in Figure 1, a kind of method for maintaining of undercarriage wheel assemblies, comprises the following steps:
Step 1: the wheel assemblies of undercarriage is decomposed into each independently accessory in resolver, comprising half wheel hub, bearing, grease retainer, snap ring, cleading, drive block and bolt;
Step 2: respectively the accessory decomposited in step 1 is delivered to cleaning area and clean, and dry up;
Step 3: will cleaning and dry up rear needs the accessory of paint removal coats depaint agent, is divided into aluminum alloy accessory and steel fitting two class, and coordinates 3 dry type sanding machinees to carry out the operation of paint removal by accessory; Wherein, depaint agent is PR3500 neutral paint stripper; PR3500 neutral paint stripper is U.S. PPG Products, meets SAE-AMS-1375 standard.Depaint agent to be brushed on accessory and about to wash after half an hour and dry up, then can enter sanding machine immediately and perform sandblasting paint removal, dry type sanding machine has 3, wherein two dry type sanding machinees for aluminum alloy accessory use the resin sand of 3.5MOH to carry out paint removal as abrasive material, and another dry type sanding machine for steel fitting uses white fused alumina as abrasive material; Blasting pressure 0.2-0.6MPa; Wherein, MOH is the unit of mole hardness, and mohs hardness is the different mineral of 10 kinds of hardness selecting, according to hardness little of the large sequence of hardness, as measuring the standard comparing other hardness of minerals.
Step 4: visual inspection is carried out to all accessories;
Step 5: non-destructive test is carried out to all accessories; Qualified all accessories are carried out cleaning and drying up if detected; Wherein, non-destructive test can adopt fluorescent penetrant detection line or magnaflux to detect.Wherein, fluorescent penetrant detection line is ASTME1417TYPEI, METHODA, LEVEL2; I.e. U.S. material engineering association E1417, Class1, method A, sensitivity 2 grades.Magnaflux is ASTME1444, namely meets American Society Testing and Materials E1444 standard.
Step 6: the accessory sprayed paint by harmless needs is sent into paint spray booth and sprayed paint, and puts into drying baker and dries, carry out cleaning and dry up after oven dry after spraying paint; Use the rotating disk that sprays paint to spray paint to accessory at paint spray booth, use dust removal mist system simultaneously; Wherein, the rotating disk that sprays paint is divided into two-layer up and down, lower floor is the go-cart of belt brake, the smooth rotation that upper strata rotating disk relies on annular bearing with rolling contact and axial antifriction bearing to realize, and be bolted in go-cart, be placed on by accessory in the rotating disk of upper strata in the process of spraying paint, rotating disk realizes spraying paint in the process of rotating.Dust removal mist system realizes collection and the discharge of discarding coating cloud mainly through large discharge prerotator, multistorey strainer mesh.Accessory is sprayed paint and comprises the following steps:
Step 601: priming paint CA7233 is sprayed on accessory; And natural seasoning at 18 ~ 29 DEG C 30 minutes, then at 49 DEG C of temperature dry 30 minutes;
Step 602: finish paint CA8201 is sprayed on accessory, and natural seasoning 30 minutes at 18 ~ 29 DEG C, then at 60 ~ 80 DEG C of temperature dry 60 minutes.Effective like this time saving drying, thus improve the efficiency of maintenance.
Step 7: by obtain in step 5 without the need to obtain in the accessory that sprays paint and step 6 spray paint after accessory be fed through erecting shop and assemble, the part changed if necessary, changes at erecting shop, has assembled rear feeding test section and has detected.
If the situations such as the change of surface pressing pit, look, burn into stripping and scuffing appear in the bearing cup of wheel hub, just think that damage appears in the bearing cup of wheel hub, need to change bearing cup.Change bearing cup be specifically divided into heat after remove bearing cup, freezing new bearing cup and by new bearing cup press-in wheel hub three steps.First bearing cup to be removed from wheel hub, coordinating between bearing cup and the mounting hole of wheel hub belongs to interference fit, because the magnitude of interference is different with bearing cup size, pull down pressure needed for bearing cup from 1t to 30 tons not etc., can adopt ordinary press or hydraulic press respectively in the process of removing, the pressure realizing 1t-60t carries out dismantlement work.Such as, Air Passenger A320 main wheel assembly C20195162 changes the common compression machine of bearing cup, and the main wheel assembly C20500100 of A321 then could realize bearing cup with hydraulic press and change.Need by freezing realization " shrinkage " before bearing cup is installed, cryogenic box is adopted to replace liquid nitrogen frozen bearing outer race, wherein, low-temperature test chamber can realize the temperature adjusting of+50 DEG C to-70 DEG C, temperature control instrument is provided with in cryogenic box, freezing temperature and freezing time are set as required, according to the relay in the condition control low-temperature test chamber arranged and alarm work, thus achieve the two ore control of temperature and time; + 50 DEG C to-70 DEG C temperature adjusting scopes cover CMM (the COMPONENTMAINTENANCEMANUAL parts for maintenance handbook) requirement of all products comprehensively.When bearing cup complete freezing after, be pressed into wheel hub.
Drive block on some wheel hub after removal, its mounting hole size is nonstandard, if do not repaired, whole wheel hub all can not re-use, therefore need before the mounting to repair, its side of repairing carries out reaming and force fit bronze bush to original mounting hole.Thus ensure that the location and installation of drive block (being mainly used in aircraft brake braking) meets CMM requirement.Aperture after main reparation step is specifically divided into metering aperture, the reaming of archioporus, metering reaming and check degree of eccentricity, the aperture processing lining obtained by the First Astronautic Research Institute for Measurement and Test, freezing lining, heating wheel hub, press-in lining check degree of eccentricity.By above-mentioned reparation, the wheel hub originally should scrapped can continue to use as certified products.Add lining operation and adopt the press-in of special pressure machine, copper rod is located, and ensure that and at the uniform velocity, is exactly pressed into assigned position.In order to verify whether the drive block after reparation can be used, and reference circle and gauge is used as built-up jig, for checking right alignment and angular deviation before and after reaming whether to meet CMM requirement, to determine that whether qualified part is available rapidly and accurately.
Adopt method provided by the invention correlation data in paint removal operation as shown in table 1, PR3500 depaint agent coordinates the paint removal of dry type sanding machine and the effect and the efficiency comparison that are used alone PR3500 depaint agent or the paint removal of dry type sanding machine.The sanding machine that following sample is selected is JCK-1212A-T dry type sanding machine, abrasive material is respectively white fused alumina and 3.5MOH resin sand, pressure 0.21MPa, specification manual is send main wheel assembly P/N:C20195162 that overhaul, that clean up, P/N:C20195162 is Air Passenger A320 main gear wheels hub assembly piece number, and this assembly comprises half corresponding wheel hub, bearing, grease retainer, snap ring, cleading, drive block and bolt.
Table 1
Can be found out by upper table, not only the paint removal time is short but also paint removal is effective to adopt method of the present invention.
Different process (natural seasoning, acceleration drying) test consuming time and result for quality supervision for arbitration (spraying paint):
(1) the CA7233 priming paint natural seasoning time is as shown in table 2:
| Temperature | Not binding dust | Can tape | Parch can topcoating minimum/at most (hour) |
| 13～17℃ | 3 ~ 4 hours | 4 ~ 5 hours | 2/72 |
| 18～23℃ | 2 ~ 3 hours | 3 ~ 4 hours | 2/72 |
| 24～28℃ | 30 ~ 90 minutes | 2 ~ 3 hours | 2/72 |
| 29～32℃ | 30 ~ 90 minutes | 2 ~ 3 hours | 2/72 |
| 33～35℃ | 30 ~ 90 minutes | 30 ~ 90 minutes | 2/72 |
In table 2, be not stained with dirt and represent enamelled coating surface drying, can not adhering dust so that its cannot wipe.Can tape and represent enamelled coating surface drying, simultaneously after general U.S. line paper self-adhesive tape pastes enamelled coating surface, tearing-off adhesive tape can not cause enamelled coating to come off or the damage of other forms of enamelled coating.Parch the minimum of time and the Temperature and Humidity Control by enamelled coating dry run consuming time at most determines.
The acceleration seasoning that the present invention adopts.The high solid-state priming paint of CA7233 allows natural seasoninies 30 minutes at 18 ~ 29 DEG C, at 49 DEG C of temperature dry 30 minutes afterwards.Being dried to can topcoating.
(2) the finish paint natural seasoning time of CA8201:
| Temperature | Can tape | Often all over the waiting time between finish paint |
| 13℃ | 8-10 hour | 60-90 minute |
| 23℃ | 5-7 hour | 45-60 minute |
| 36℃ | 3-4 hour | 30-45 minute |
The acceleration seasoning that the present invention adopts, by CA8201 finish paint first 18 ~ 29 DEG C of natural seasoninies 30 minutes, then at 60 ~ 80 DEG C of temperature dry 60 minutes.
In painting process, substantially reduce the time of wait like this, effectively improve the efficiency of maintenance.
Method provided by the invention defines pipelining maintenance, makes maintenance mode systematization more, can carry out strict control to each link of maintenance.The place needed repairing can be found accurately simultaneously, and effectively raise the efficiency of maintenance, save human and material resources resource.
Claims (5)
1. a method for maintaining for undercarriage wheel assemblies, is characterized in that: comprise the following steps:
Step 1: the wheel assemblies of undercarriage is decomposed into each independently accessory in resolver;
Step 2: respectively the accessory decomposited in step 1 is cleaned, and dry up;
Step 3: will cleaning and dry up rear needs the accessory of paint removal coats depaint agent, is divided into aluminum alloy accessory and steel fitting two class, and coordinates multiple stage dry type sanding machine to carry out the operation of paint removal by accessory;
Step 4: visual inspection is carried out to all accessories;
Step 5: non-destructive test is carried out to all accessories; Qualified all accessories are carried out cleaning and drying up if detected;
Step 6: the accessory sprayed paint by harmless needs is sent into paint spray booth and sprayed paint, and puts into drying baker and dries, carry out cleaning and dry up after oven dry after spraying paint;
Step 7: by obtain in step 5 without the need to obtain in the accessory that sprays paint and step 6 spray paint after accessory be fed through erecting shop and assemble, the part changed if necessary, changes at erecting shop, has assembled rear feeding test section and has detected.
2. the method for maintaining of undercarriage wheel assemblies according to claim 1, is characterized in that: the depaint agent adopted in described step 3 is PR3500 neutral paint stripper; Dry type sanding machine has 3, and wherein two dry type sanding machinees for aluminum alloy accessory use the resin sand of 3.5MOH to carry out paint removal as abrasive material, and another dry type sanding machine for steel fitting uses white fused alumina as abrasive material; Blasting pressure 0.2-0.6MPa.
3. the method for maintaining of undercarriage wheel assemblies according to claim 1, is characterized in that: the non-destructive test described in step 5 adopts fluorescent penetrant detection line or magnaflux to detect.
4. the method for maintaining of undercarriage wheel assemblies according to claim 1, is characterized in that: use rotating disk double wheel hub that spray paint to spray paint at paint spray booth in described step 6, use dust removal mist system simultaneously in paint spray booth.
5. the method for maintaining of undercarriage wheel assemblies according to claim 1, is characterized in that: spraying paint to described half wheel hub in step 6 comprises the following steps:
Step 601: priming paint CA7233 is sprayed on half wheel hub; And natural seasoning at 18 ~ 29 DEG C 30 minutes, then at 49 DEG C of temperature dry 30 minutes;
Step 602: finish paint CA8201 is sprayed on half wheel hub, and natural seasoning 30 minutes at 18 ~ 29 DEG C, then at 60 ~ 80 DEG C of temperature dry 60 minutes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510601322.6A CN105173115A (en) | 2015-04-23 | 2015-09-18 | Method for maintaining airplane wheel assembly of airplane landing gear |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2015101973900 | 2015-04-23 | ||
| CN201510197390 | 2015-04-23 | ||
| CN201510601322.6A CN105173115A (en) | 2015-04-23 | 2015-09-18 | Method for maintaining airplane wheel assembly of airplane landing gear |
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| CN105173115A true CN105173115A (en) | 2015-12-23 |
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| CN201510601322.6A Pending CN105173115A (en) | 2015-04-23 | 2015-09-18 | Method for maintaining airplane wheel assembly of airplane landing gear |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109283935A (en) * | 2017-07-21 | 2019-01-29 | 卢真锡 | A kind of managing device and method of unmanned plane |
| CN110171578A (en) * | 2019-04-15 | 2019-08-27 | 广州飞机维修工程有限公司 | A kind of undercarriage high-strength steel part overhauls method |
| CN110481812A (en) * | 2019-08-07 | 2019-11-22 | 上海海鹰机械厂 | Method is repaired in the examination of certain type machine undercarriage damper leg |
| CN112265652A (en) * | 2020-09-10 | 2021-01-26 | 大连长丰实业总公司 | Maintenance method of airplane pipe joint |
| CN113500351A (en) * | 2021-05-27 | 2021-10-15 | 沈阳北方飞机维修有限公司 | Maintenance method for corrosion cracks on main wheel of airplane |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109283935A (en) * | 2017-07-21 | 2019-01-29 | 卢真锡 | A kind of managing device and method of unmanned plane |
| CN110171578A (en) * | 2019-04-15 | 2019-08-27 | 广州飞机维修工程有限公司 | A kind of undercarriage high-strength steel part overhauls method |
| CN110171578B (en) * | 2019-04-15 | 2022-05-31 | 广州飞机维修工程有限公司 | Method for overhauling high-strength steel part of aircraft landing gear |
| CN110481812A (en) * | 2019-08-07 | 2019-11-22 | 上海海鹰机械厂 | Method is repaired in the examination of certain type machine undercarriage damper leg |
| CN112265652A (en) * | 2020-09-10 | 2021-01-26 | 大连长丰实业总公司 | Maintenance method of airplane pipe joint |
| CN112265652B (en) * | 2020-09-10 | 2023-05-26 | 大连长丰实业总公司 | Maintenance method of aircraft pipe joint |
| CN113500351A (en) * | 2021-05-27 | 2021-10-15 | 沈阳北方飞机维修有限公司 | Maintenance method for corrosion cracks on main wheel of airplane |
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Application publication date: 20151223 |
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