CN106181248A - A kind of aluminium alloy car sheet metal component remanufactures technique - Google Patents
A kind of aluminium alloy car sheet metal component remanufactures technique Download PDFInfo
- Publication number
- CN106181248A CN106181248A CN201610612418.7A CN201610612418A CN106181248A CN 106181248 A CN106181248 A CN 106181248A CN 201610612418 A CN201610612418 A CN 201610612418A CN 106181248 A CN106181248 A CN 106181248A
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- sheet metal
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- aluminium alloy
- aluminum
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- 229910052751 metal Inorganic materials 0.000 title claims abstract description 80
- 239000002184 metal Substances 0.000 title claims abstract description 80
- 238000000034 method Methods 0.000 title claims abstract description 54
- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 52
- 238000007493 shaping process Methods 0.000 claims abstract description 46
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 28
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 28
- 238000003466 welding Methods 0.000 claims abstract description 22
- 238000007689 inspection Methods 0.000 claims abstract description 21
- 238000005476 soldering Methods 0.000 claims abstract description 18
- 239000003973 paint Substances 0.000 claims abstract description 13
- 238000012360 testing method Methods 0.000 claims abstract description 13
- 239000011229 interlayer Substances 0.000 claims abstract description 10
- 238000005516 engineering process Methods 0.000 claims abstract description 9
- 238000011156 evaluation Methods 0.000 claims abstract description 7
- 238000000465 moulding Methods 0.000 claims abstract description 7
- 238000010422 painting Methods 0.000 claims abstract description 7
- 239000002356 single layer Substances 0.000 claims abstract description 7
- 239000004411 aluminium Substances 0.000 claims abstract description 6
- 238000000227 grinding Methods 0.000 claims abstract description 4
- 238000009527 percussion Methods 0.000 claims abstract description 4
- 230000007547 defect Effects 0.000 claims description 21
- 230000000994 depressogenic effect Effects 0.000 claims description 12
- 239000007921 spray Substances 0.000 claims description 12
- 239000011248 coating agent Substances 0.000 claims description 7
- 238000000576 coating method Methods 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 7
- 238000012856 packing Methods 0.000 claims description 6
- 238000010009 beating Methods 0.000 claims description 5
- 238000005498 polishing Methods 0.000 claims description 4
- 244000137852 Petrea volubilis Species 0.000 claims description 3
- 238000003556 assay Methods 0.000 claims description 3
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- 230000008602 contraction Effects 0.000 claims description 3
- 238000005336 cracking Methods 0.000 claims description 3
- 230000007812 deficiency Effects 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 3
- 239000004922 lacquer Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 238000004806 packaging method and process Methods 0.000 claims description 3
- 238000007517 polishing process Methods 0.000 claims description 3
- 239000011148 porous material Substances 0.000 claims description 3
- 230000037452 priming Effects 0.000 claims description 3
- 239000004576 sand Substances 0.000 claims description 3
- 239000002893 slag Substances 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 3
- 230000007704 transition Effects 0.000 claims description 3
- 238000010276 construction Methods 0.000 claims description 2
- 229910017435 S2 In Inorganic materials 0.000 claims 1
- 230000003796 beauty Effects 0.000 abstract description 3
- 230000000694 effects Effects 0.000 abstract description 3
- 239000010410 layer Substances 0.000 abstract 1
- 238000004080 punching Methods 0.000 abstract 1
- 229910000831 Steel Inorganic materials 0.000 description 6
- 239000010959 steel Substances 0.000 description 6
- 238000012937 correction Methods 0.000 description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical group [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 2
- 241001061264 Astragalus Species 0.000 description 1
- 240000002791 Brassica napus Species 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000009966 trimming Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
Abstract
The invention discloses a kind of aluminium alloy car sheet metal component remanufactures technique, comprises the following steps: S1, inspection and evaluation；S2, depainting process: be purged processing to the painting layer of remanufactured component；S3, aluminum alloy sheet metal component shaping and soldering: aluminum alloy sheet metal component finishing point monolayer shaping and interlayer shaping two kinds, soldering uses special gas protection welding machine and welding technology the tear position soldering of aluminum alloy sheet metal component to be got up with suitable aluminium welding wire；S4, weld inspection；S5, fine shaping: two kinds of methods of impact reshaping method that application soft metal parallels coordinates percussion shaping method and hand hammer to coordinate with spherical punching with shaping hammer are carried out.S6, on-the-spot testing/3D scans comparison: the sheet metal component after shaping carries out on-the-spot testing, it is also possible to application 3D scanner unit carries out moulding scanning to the parts repaired, and the data stored with computer are compared, and error should be in allowed band；S7, grinding process；S8, basecoat paint.S9, product inspection, this remanufactures technique can effectively process the reparation problem of aluminum alloy sheet metal component, and repairing quality is stable, even can reach the effect matched in excellence or beauty with new part.
Description
Technical field
The present invention relates to sheet metal component re-manufacturing technology field, particularly relate to a kind of aluminium alloy car sheet metal component and remanufacture work
Skill.
Background technology
For the needs of energy-saving and emission-reduction, increasing vehicle begins with aluminum alloy sheet metal component to replace steel thin plate metal plate
Gold part.Because it can alleviate much weight compared with steel thin plate sheet metal component；There is enough intensity and the most perishable, permissible
It is effectively reduced oil consumption, the acceleration of raising vehicle.
But with the reparation of steel thin plate sheet metal component in terms of the Plastic recovery that aluminum alloy sheet metal component is after vehicle collision accident
Technology is compared, and technology requires and maintenance of equipment all makes a big difference.
Summary of the invention
For solving technical problem present in background technology, the present invention proposes a kind of aluminium alloy car sheet metal component and remanufactures work
Skill, this remanufactures technique can effectively process the reparation problem of aluminum alloy sheet metal component, and repairing quality is stable, even can reach with newly
The effect that part matches in excellence or beauty.
To this end, the invention provides a kind of aluminium alloy car sheet metal component to remanufacture technique, it is characterised in that include following step
Rapid:
S1, inspection and evaluation: aluminum alloy sheet metal component first carries out inspection and evaluation to it before remanufacturing, and determines if having the valency of remanufacturing
Value；
S2, depainting process: carry out painting removing process to the coating of remanufactured component；
S3, aluminium sheet shaping and soldering: aluminum alloy sheet metal component finishing point monolayer shaping and interlayer shaping two kinds, soldering uses special gas
The tear position soldering of aluminum alloy sheet metal component is got up by body protection welding machine and welding technology with suitable aluminium welding wire, recovers its original
Integrity；
S4, weld inspection: carry out next step after the assay was approved；
S5, fine shaping: application soft metal parallels coordinates percussion shaping method and hand hammer and spherical rushes rushing of coordinating with shaping hammer
Hit two kinds of methods of shaping method to carry out.
S6, on-the-spot testing/3D scans comparison: the sheet metal component after shaping carries out on-the-spot testing, it is also possible to application 3D scanner unit
The parts repaired carrying out moulding scanning, and the data stored with computer are compared, error should be in allowed band.
S7, grinding process: crossing the evenest slipping over intact lacquer painting transitional region for local touch-up paint, polish one
The pinniform limit of circle width about 2～3CM is to guarantee touch-up paint quality.
S8, basecoat paint: first spray reverse side and position, corner, finally spraying interarea part, typically sprays twice, and first pass dodges
Dry followed by spray second time, the thickness general control of priming paint is at 0.06mm halfway.
S9, product inspection: to the finished product after above-mentioned steps remanufactures, to its weld seam, geomery, surface modeling, kiss
Right, primer surface smooth texture degree is tested, and checks qualified then packaging warehouse-in or delivery, before disqualified upon inspection returns again to
The operation in face processes.
Preferably, the project checked in described step S1 includes defect situation and deformation extent.
Wherein exist in situations below any one of defect situation all should be judged to without remanufacturing value: aluminum alloy sheet metal component
Serious defect, defect area is more than 9cm2；There is defect in undercut position, edge；Single tearing port length surpasses 200mm or tear
Mouth is more than 5；
Any one during wherein deformation extent exists situations below all should be judged to without remanufacturing value: aluminum alloy sheet metal component is serious
Distortion or folded deformation；There is folded deformation in undercut position, edge.
Preferably, in described step S2, when spray area is less than 1/3 after repairing, uses polishing process to remove depainting, make
Grind off the coating of surrounding with the polisher equipped with 80～No. 100 sand paper, its polisher rotating speed is less than 2500r/min.
Preferably, in described step S3, before aluminum alloy sheet metal component is carried out soldering, it is necessary to first differentiate the material of its aluminium alloy
The matter trade mark, in order to accurately select welding rod, and use the welding manner of MIG automatic feeding.
Preferably, in described step S4, the requirement of weld inspection must not be pore, sand holes, slag inclusion, rift defect.
Preferably, in described step S3 and step S5, original curved surface peace should be recovered in the surface after shaping and soldering
Whole degree, if desired with the file finishing of aluminum panel beating, during correction, filing amount can not prevent intensity deficiency from causing more than the 1/4 of sheet metal thickness
Cracking phenomena.
Preferably, in described step S3 and step S5, when aluminum sheet metal component produces and significantly extends phenomenon, take thermal contraction
Method process, the sheet metal component dimensional discrepancy after fine shaping controls within 1mm；Form variations controls at 1mm every
In 100mm arc length.
Preferably, in described step S6, on-the-spot testing and 3D scan comparison, as on-the-spot testing then must be enterprising at former car
OK, being installed on former car by the sheet metal component after fine shaping, the project of its comparison includes:
(1) position installing key element is the most accurate；
(3) whether the moulding transition with neighbouring sheet metal component or parts coincide and combines gap whether uniformity；
(4) the most consistent with the model curved surface of former car symmetrical member.
Preferably, in described step S7, by the aluminum alloy sheet metal component aluminum putty packing defect after polishing, aluminum putty is with solid
Agent harmonic proportion is 100:2～100:3, waits aluminum putty to polish flat smooth surface after drying, and aluminum putty packing divides 2～3
Constructing in road, the gross thickness after completing should be less than 0.6mm.
Preferably, in described step S3, monolayer is shaped as: left hand soft metal parallels pad is in depressed area, right hand shaping
Hammer taps boss or the periphery of depressed area；According to circumstances can heat shaping, add with the temperature-sensitive pen of 120 DEG C before heating
The periphery in hot spot draws the circle that a diameter is more bigger than heating region, with blowtorch or welding torch, this region is heated uniformly to temperature-sensitive circle and becomes
Color；
Interlayer is shaped as: when interlayer position distortions, when soft metal parallels even sticks up the reverse side that rod also cannot touch depressed area, uses
Aluminum special meson machine is repaired.
The present invention proposes a kind of aluminium alloy car sheet metal component and remanufactures technique, and this remanufactures technique can effectively process aluminum conjunction
The reparation problem of gold sheet metal component, repairing quality is stable, even can reach the effect matched in excellence or beauty with new part.
Accompanying drawing explanation
Fig. 1 is the flow chart of the specific embodiment of the invention.
Detailed description of the invention
Below, by specific embodiment, technical scheme is described in detail.
Embodiment:
With reference to Fig. 1, the present invention proposes a kind of aluminium alloy car sheet metal component and remanufactures technique, comprises the following steps:
S1, inspection and evaluation: aluminum alloy sheet metal component first carries out inspection and evaluation to it before remanufacturing, and determines if having the valency of remanufacturing
Value；The project checked includes defect situation and deformation extent；
Wherein exist in situations below any one of defect situation all should be judged to without remanufacturing value: aluminum alloy sheet metal component is serious
Defect, defect area is more than 9cm2；There is defect in undercut position, edge；Single tearing port length surpasses 200mm or tearing port is many
In 5；
Any one during wherein deformation extent exists situations below all should be judged to without remanufacturing value: aluminum alloy sheet metal component is serious
Distortion or folded deformation；There is folded deformation in undercut position, edge.
S2, depainting process: carry out painting removing process to the coating of remanufactured component；After repairing, spray area is less than 1/3
Time, use polishing process to remove depainting, use the polisher equipped with 80～No. 100 sand paper to grind off the coating of surrounding, its polisher
Rotating speed is less than 2500r/min；
S3, aluminum alloy sheet metal component shaping and soldering: aluminium alloy panels finishing point monolayer shaping and interlayer shaping two kinds, soldering uses
The tear position soldering of aluminum alloy sheet metal component is got up by special gas protection welding machine and welding technology with suitable aluminium welding wire, recovers
The integrity of its original；Before aluminum alloy sheet metal component is carried out soldering, it is necessary to first differentiate the material trade mark of its aluminium alloy, in order to accurate
Really select welding rod, and use the welding manner of MIG automatic feeding to weld；
Monolayer is shaped as: left hand soft metal parallels pad taps boss or depressed part at depressed area, right hand shaping hammer
The periphery of position；Tap dynamics can not be excessive every time, more can not tap by gravity, prevent aluminium when particularly later stage parallels pads substantially
Extending and be difficult to recover, beating position to impact along the periphery from coil to coil of depressed area to centre, raps multi-hit, incremental；
According to circumstances can heat shaping, draw an individual diameter with periphery at heating position of the temperature-sensitive pen of 120 DEG C before heating and compare heating region
Bigger circle, is heated uniformly to temperature-sensitive circle variable color with blowtorch or welding torch to this region, at this moment the temperature of heated center region up to
About 250～350 DEG C, still there is bigger safety margin than aluminum alloy melting temperature 660 DEG C degree；
Interlayer is shaped as: when interlayer position distortions, when soft metal parallels even sticks up the reverse side that rod also cannot touch depressed area, uses
Aluminum special meson machine is repaired；
A. coating and the oxide at trimming position are removed, it is ensured that sheet metal component contacts well with the bonding of meson machine,
B. find out the stretching main line of sunk area, with meson machine on stretching main line uniformly spot welding stretching circle (stretching circle number and
Density degree is depending on deformed region size and stretching dynamics),
C. steel bar is hooked steel bar with inertia hammer again through stretching circle and carries out tensile impact,
D. the sudden change astragal or with constant force pulling steel bar then rushed along depressed area periphery with hand hammer and dome rushes gently
Hit, thus by depressed area slowly pull-up.
S4, weld inspection: the requirement of weld inspection must not be pore, sand holes, slag inclusion, rift defect, after the assay was approved
Carry out next step；
S5, fine shaping: application soft metal parallels coordinates percussion shaping method and hand hammer and spherical rushes rushing of coordinating with shaping hammer
Hit two kinds of methods of shaping method to carry out；
When aluminum sheet metal component produces and significantly extends phenomenon, the method for thermal contraction is taked to process, the panel beating after fine shaping
Part dimensional discrepancy controls within 1mm；Form variations controls in 1mm every 100mm arc length；Surface after shaping and soldering should
Recovering original curved surface and flatness, if desired with the file finishing of aluminum panel beating, during correction, filing amount can not be more than the 1/ of sheet metal thickness
4, prevent the cracking phenomena that intensity deficiency causes；
S6, on-the-spot testing/3D scans comparison: the sheet metal component after shaping carries out on-the-spot testing, it is also possible to application 3D scanner unit is to repairing
Copy carries out moulding scanning, and the data stored with computer are compared, and error should be in allowed band；On-the-spot testing must be former
Carrying out on car, be installed on former car by the sheet metal component after fine shaping, the project of its comparison includes:
(1) position installing key element is the most accurate；
(3) whether the moulding transition with neighbouring sheet metal component or parts coincide and combines gap whether uniformity；
(4) the most consistent with the model curved surface of former car symmetrical member；
S7, grinding process: by the aluminum alloy sheet metal component aluminum putty packing defect after polishing, aluminum putty and firming agent harmonic proportion
For 100:2～100:3, waiting aluminum putty to polish flat smooth surface after drying, aluminum putty packing divides 2～3 road constructions, after completing
Gross thickness should be less than 0.6mm；Crossing the evenest slipping over intact lacquer painting transitional region for local touch-up paint, polish one
The pinniform limit of circle width about 2～3CM is to guarantee touch-up paint quality；
S8, basecoat paint: first spray reverse side and position, corner, finally spraying interarea part, typically sprays twice, and first pass dodges after doing
Then spray second time, the thickness general control of priming paint is at 0.06mm halfway.
S9, product inspection: to the finished product after above-mentioned steps remanufactures, to its weld seam, geomery, surface modeling, kiss
Right, primer surface smooth texture degree is tested, and checks qualified then packaging warehouse-in or delivery, before disqualified upon inspection returns again to
The operation in face processes.
The above, the only present invention preferably detailed description of the invention, but protection scope of the present invention is not limited thereto,
Any those familiar with the art in the technical scope that the invention discloses, according to technical scheme and
Inventive concept equivalent or change in addition, all should contain within protection scope of the present invention.
Claims (10)
1. an aluminium alloy car sheet metal component remanufactures technique, it is characterised in that comprise the following steps:
S1, inspection and evaluation: aluminum alloy sheet metal component first carries out inspection and evaluation to it before remanufacturing, and determines if having reparation valency
Value；
S2, depainting process: carry out painting removing process to the coating of remanufactured component；
S3, aluminum alloy sheet metal component shaping and soldering: aluminium alloy panels finishing point monolayer shaping and interlayer shaping two kinds, soldering uses
The tear position soldering of aluminum alloy sheet metal component is got up by special gas protection welding machine and welding technology with suitable aluminium welding wire, recovers
The integrity of its original；
S4, weld inspection: carry out next step after the assay was approved；
S5, fine shaping: application soft metal parallels coordinates percussion shaping method and hand hammer and spherical rushes rushing of coordinating with shaping hammer
Hit two kinds of methods of shaping method to carry out；
S6, on-the-spot testing/3D scans comparison: the sheet metal component after shaping carries out on-the-spot testing, it is also possible to application 3D scanner unit is to repairing
Multiple parts carry out moulding scanning, and the data stored with computer are compared, and error should be in allowed band；
S7, grinding process: crossing the evenest slipping over intact lacquer painting transitional region for local touch-up paint, polish a circle width
The pinniform limit of degree about 2～3CM is to guarantee touch-up paint quality；
S8, basecoat paint: first spray reverse side and position, corner, finally spraying interarea part, typically sprays twice, and first pass dodges after doing
Then spray second time, the thickness general control of priming paint is at 0.06mm halfway；
S9, product inspection: to the finished product after above-mentioned steps remanufactures, to its weld seam, geomery, surface modeling, the goodness of fit,
Primer surface smooth texture degree is tested, and checks qualified then packaging warehouse-in or delivery, and disqualified upon inspection returns again to above
Operation processes.
2. a kind of aluminium alloy car sheet metal component as claimed in claim 1 remanufactures technique, it is characterised in that in described step S1
The project checked includes defect situation and deformation extent；
Wherein exist in situations below any one of defect situation all should be judged to without remanufacturing value: aluminum alloy sheet metal component is serious
Defect, defect area is more than 9cm2；There is defect in undercut position, edge；Single tearing port length surpasses 200mm or tearing port is many
In 5；
Any one during wherein deformation extent exists situations below all should be judged to without remanufacturing value: aluminum alloy sheet metal component is serious
Distortion or folded deformation；There is folded deformation in undercut position, edge.
3. a kind of aluminium alloy car sheet metal component as claimed in claim 1 remanufactures technique, it is characterised in that described step S2
In, when spray area is less than 1/3 after repairing, uses polishing process to remove depainting, use the polishing equipped with 80～No. 100 sand paper
Machine grinds off the coating of surrounding, and its polisher rotating speed is less than 2500r/min.
4. a kind of aluminium alloy car sheet metal component as claimed in claim 1 remanufactures technique, it is characterised in that described step S3
In, before aluminum alloy sheet metal component is carried out soldering, it is necessary to first differentiate the material trade mark of its aluminium alloy, in order to accurately select welding rod,
And use the welding manner of MIG automatic feeding to weld.
5. a kind of aluminium alloy car sheet metal component as claimed in claim 1 remanufactures technique, it is characterised in that described step S4
In, the requirement of weld inspection must not be pore, sand holes, slag inclusion, rift defect.
6. aluminium alloy car sheet metal component as claimed in claim 1 a kind of remanufactures technique, it is characterised in that described step S3 and
In step S5, original curved surface and flatness should be recovered in the surface after shaping and soldering, if desired with the file finishing of aluminum panel beating, repaiies
Timing filing amount can not prevent, more than the 1/4 of sheet metal thickness, the cracking phenomena that intensity deficiency causes.
7. aluminium alloy car sheet metal component as claimed in claim 1 a kind of remanufactures technique, it is characterised in that described step S3 and
In step S5, when aluminum sheet metal component produces and significantly extends phenomenon, the method for thermal contraction is taked to process, after fine shaping
Sheet metal component dimensional discrepancy controls within 1mm；Form variations controls in 1mm/100mm arc length.
8. a kind of aluminium alloy car sheet metal component as claimed in claim 1 remanufactures technique, it is characterised in that described step S6
In, on-the-spot testing and 3D scan comparison, as on-the-spot testing then must be carried out on former car, are installed by the sheet metal component after fine shaping
On former car, the project of its comparison includes:
(1) position installing key element is the most accurate；
(3) whether the moulding transition with neighbouring sheet metal component or parts coincide and combines gap whether uniformity；
(4) the most consistent with the model curved surface of former car symmetrical member.
9. a kind of aluminium alloy car sheet metal component as claimed in claim 1 remanufactures technique, it is characterised in that described step S8
In, by the aluminum alloy sheet metal component aluminum putty packing defect after polishing, aluminum putty and firming agent harmonic proportion are 100:2～100:
3, wait aluminum putty to polish flat smooth surface after drying, aluminum putty packing divides 2～3 road constructions, and the gross thickness after completing should be little
In 0.6mm.
10. a kind of aluminium alloy car sheet metal component as claimed in claim 1 remanufactures technique, it is characterised in that described step S3
Middle monolayer is shaped as: left hand soft metal parallels pad taps boss or depressed area at depressed area, right hand shaping hammer
Periphery；According to circumstances can heat shaping, draw an individual diameter ratio with periphery at heating position of the temperature-sensitive pen of 120 DEG C before heating and add
The circle that thermal region is bigger, is heated uniformly to temperature-sensitive circle variable color with blowtorch or welding torch to this region；
Interlayer is shaped as: when interlayer position distortions, when soft metal parallels even sticks up the reverse side that rod also cannot touch depressed area, uses
Aluminum special meson machine is repaired.
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| CN201610612418.7A CN106181248B (en) | 2016-07-31 | 2016-07-31 | A kind of aluminium alloy car sheet metal component remanufactures technique |
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| CN201610612418.7A CN106181248B (en) | 2016-07-31 | 2016-07-31 | A kind of aluminium alloy car sheet metal component remanufactures technique |
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| CN108857278A (en) * | 2018-07-02 | 2018-11-23 | 安徽省佳隆汽车配件有限公司 | A kind of automobile cylinder cover aluminium sheet welding procedure |
| CN109848250A (en) * | 2018-11-22 | 2019-06-07 | 今创集团股份有限公司 | The hot shaping process of aluminium alloy sheet silk filling |
| CN110877006A (en) * | 2018-09-05 | 2020-03-13 | 中航贵州飞机有限责任公司 | Repair process for surface defects of aircraft skin |
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