CN116329569A - Repair method suitable for corrosion damage of magnesium alloy casing - Google Patents
Repair method suitable for corrosion damage of magnesium alloy casing Download PDFInfo
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- CN116329569A CN116329569A CN202310315603.XA CN202310315603A CN116329569A CN 116329569 A CN116329569 A CN 116329569A CN 202310315603 A CN202310315603 A CN 202310315603A CN 116329569 A CN116329569 A CN 116329569A
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- 238000000034 method Methods 0.000 title claims abstract description 34
- 230000008439 repair process Effects 0.000 title claims abstract description 33
- 238000005507 spraying Methods 0.000 claims abstract description 50
- 238000010288 cold spraying Methods 0.000 claims abstract description 24
- 238000003754 machining Methods 0.000 claims abstract description 19
- 230000007547 defect Effects 0.000 claims abstract description 17
- 239000011248 coating agent Substances 0.000 claims abstract description 16
- 238000000576 coating method Methods 0.000 claims abstract description 16
- 230000008021 deposition Effects 0.000 claims abstract description 14
- 238000009659 non-destructive testing Methods 0.000 claims abstract description 13
- 238000003801 milling Methods 0.000 claims abstract description 10
- 238000012545 processing Methods 0.000 claims abstract description 7
- 238000005488 sandblasting Methods 0.000 claims description 21
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- 239000000654 additive Substances 0.000 claims description 8
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- 238000001514 detection method Methods 0.000 claims description 8
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- 239000002994 raw material Substances 0.000 claims description 5
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- 238000005516 engineering process Methods 0.000 abstract description 11
- 238000012423 maintenance Methods 0.000 description 7
- 244000137852 Petrea volubilis Species 0.000 description 6
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
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- 239000000853 adhesive Substances 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
- B22F10/10—Formation of a green body
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
- B22F10/60—Treatment of workpieces or articles after build-up
- B22F10/66—Treatment of workpieces or articles after build-up by mechanical means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
- B22F10/80—Data acquisition or data processing
- B22F10/85—Data acquisition or data processing for controlling or regulating additive manufacturing processes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F7/00—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression
- B22F7/06—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite workpieces or articles from parts, e.g. to form tipped tools
- B22F7/062—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite workpieces or articles from parts, e.g. to form tipped tools involving the connection or repairing of preformed parts
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y10/00—Processes of additive manufacturing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y40/00—Auxiliary operations or equipment, e.g. for material handling
- B33Y40/20—Post-treatment, e.g. curing, coating or polishing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y50/00—Data acquisition or data processing for additive manufacturing
- B33Y50/02—Data acquisition or data processing for additive manufacturing for controlling or regulating additive manufacturing processes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y80/00—Products made by additive manufacturing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F7/00—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression
- B22F7/06—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite workpieces or articles from parts, e.g. to form tipped tools
- B22F7/062—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite workpieces or articles from parts, e.g. to form tipped tools involving the connection or repairing of preformed parts
- B22F2007/068—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite workpieces or articles from parts, e.g. to form tipped tools involving the connection or repairing of preformed parts repairing articles
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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- Y02P10/25—Process efficiency
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Abstract
The invention discloses a repair method suitable for corrosion damage of a magnesium alloy casing, which comprises the steps of carrying out nondestructive testing on the magnesium alloy casing, removing corrosion products and surface cracks on the surface of a damaged part, obtaining point cloud data of the damaged part through a three-dimensional scanning technology, generating parameters of control points of a primary processing surface, optimizing the parameters to construct a curved surface model, quickly and accurately obtaining a curved surface shape, carrying out machining on the damaged part according to the curved surface shape to obtain a spraying base surface, carrying out coating repair on the spraying base surface by adopting a cold spraying technology, forming a deposition layer on the spraying base surface, carrying out milling processing on the deposition layer, and checking the coating quality after the appearance and the size of the magnesium alloy casing are recovered. The damaged part is subjected to model reconstruction by a three-dimensional scanning modeling technology, defect information of the damaged part is rapidly and accurately obtained, and machining treatment is carried out on the damaged part according to the defect information, so that the coating has better binding force with a spraying base surface during subsequent cold spraying, and the service performance after repair is improved.
Description
Technical Field
The invention relates to the technical field of aviation part maintenance, in particular to a method for repairing corrosion damage of a magnesium alloy casing.
Background
The magnesium alloy casing and related parts have the defects of easy surface cracking, loosening, air holes, inclusion and the like in a complex service environment, or the magnesium alloy is easy to damage the surface of the casing due to poor corrosion resistance, low hardness, corrosion medium erosion and external force action.
In the process of repairing a magnesium alloy casing and related parts, the surface pretreatment is required to be carried out on the corroded part, in the prior art, the surface of the corroded damaged magnesium alloy casing is repaired by using a cold spraying mode, and before the repair is carried out, the corroded part is usually required to be polished and pretreated by using sand paper so as to facilitate the combination of a matrix and a coating, but the abrasion time is long through the sand paper, the polished precision is low, so that the combination of the matrix and the coating is weak, the strength of the repaired parts is influenced, and the repaired parts cannot meet the service requirements.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to overcome the defects of long time consumption and low polishing precision of the part corroded by sand paper in the prior art, thereby providing a repairing method for the corrosion damage of the magnesium alloy casing, which can ensure that the strength requirement is met after repairing.
In order to solve the technical problems, the technical scheme of the invention is as follows:
a repair method suitable for corrosion damage of a magnesium alloy casing comprises the following steps:
nondestructive testing and surface pretreatment: removing corrosion products and surface cracks on the surface of the magnesium alloy case by combining with a nondestructive testing result;
and (3) scanning modeling: carrying out laser scanning on the damaged part after removing the surface corrosion products and the surface cracks, and constructing a curved surface model;
constructing a curved surface shape and processing a spraying base surface: constructing a curved surface shape to be processed at the damaged part according to the curved surface model, and machining the curved surface shape to obtain a spraying base surface;
cold spray additive repair: carrying out cold spraying repair on the spraying basal plane, wherein the thickness of a sprayed deposition layer is higher than the surface height of the original magnesium alloy case;
finish machining of the surface of a damaged part: milling the deposited layer by machining to obtain the initial shape and size of the surface of the magnesium alloy case;
surface treatment and performance detection: and carrying out local or whole surface treatment on the repaired magnesium alloy casing, and checking the quality of the coating repaired on the surface of the magnesium alloy casing.
According to some embodiments of the invention, after performing nondestructive testing and surface pretreatment, mechanical analysis is performed on the magnesium alloy casing in combination with the percentage of the area of the damaged part to the section where the magnesium alloy casing is damaged.
According to some embodiments of the invention, the area of the damaged portion is less than or equal to 10% of the cross section of the magnesium alloy casing where the damage is located.
According to some embodiments of the invention, in the scan modeling, a defect point cloud of the damaged part is obtained through a 3D scanning device, and the curved surface model is constructed through three-dimensional modeling software according to the defect point cloud.
According to some embodiments of the invention, in the constructing the curved surface shape and processing the spraying base surface, machining the damaged portion according to the parameter of the curved surface shape by a numerical control machine tool to obtain the spraying base surface.
According to some embodiments of the invention, after the spraying base surface is obtained, the spraying base surface is subjected to sand blasting roughening, and the roughened spraying base surface has a surface roughness of Ra 3-5.
According to some embodiments of the invention, the sandblasting and roughening process parameter is pressure 0.3-0.5 MPa, sandblasting distance: 30-50 mm, the sand blasting angle is 90 degrees+/-10 degrees, and the sand blasting coverage rate is 100%.
According to some embodiments of the invention, after the sandblasting roughening, the sprayed base surface is surface cleaned by a cleaning machine, the surface cleaning time and the cold spray repair time being less than or equal to 4 hours apart.
According to some embodiments of the invention, the coating raw material is a pure aluminum metal powder having a particle size of 20-53 μm.
According to some embodiments of the invention, the cold spraying uses inert gas as powder driving gas, and the spraying parameters are: the air flow pressure is 3-5 MPa, the spraying temperature is 350-550 ℃, the spraying distance is 20-50 mm, and the powder feeding rate is 10-50 g/min.
The technical scheme of the invention has the following advantages:
1. according to the method for repairing the corrosion damage of the magnesium alloy casing, the magnesium alloy casing is subjected to nondestructive testing, corrosion products and surface cracks on the surface of the damaged part are removed after the damaged part is determined, a three-dimensional scanning technology is used for carrying out laser scanning on the damaged part, a curved surface model is constructed through point cloud data obtained through scanning, the curved surface shape of the surface to be repaired is quickly and accurately obtained according to the optimized parameters of the curved surface model, the part to be repaired is machined according to the curved surface shape to obtain a spraying base surface, then the spraying base surface is subjected to additive repair by adopting a cold spraying technology, a deposition layer is formed on the spraying base surface to be repaired of the magnesium alloy casing, the initial shape and the size of the magnesium alloy casing are obtained through milling the deposition layer, and after the repaired magnesium alloy casing is subjected to local or whole surface treatment, the coating quality and the casing strength performance are inspected. According to the repairing method, the damaged part is subjected to model reconstruction by a three-dimensional scanning modeling technology, so that defect information of the damaged part is rapidly and accurately obtained, and machining treatment is carried out on the damaged part according to the defect information, so that a coating and a matrix can be better combined during subsequent cold spraying, and the quality and strength performance of the repaired coating are improved.
2. According to the method for repairing the corrosion damage of the magnesium alloy casing, the three-dimensional scanning technology is combined with the three-dimensional modeling software to build the model of the damaged part, the defect information of the damaged part is rapidly and accurately obtained in a software optimization mode, the damaged part is machined by combining with the result data after the software optimization, the data quantity is reduced, the method is suitable for the measurement requirement of large-size parts, the defect information of the damaged part of the large-size parts is rapidly and accurately obtained, and the efficiency is improved.
3. According to the repair method for the corrosion damage of the magnesium alloy casing, the pure aluminum metal powder is used as a coating raw material, the damaged part is repaired in a cold spraying mode, the pure aluminum has excellent corrosion resistance, the galvanic corrosion driving force with the magnesium alloy is small, the low density, high electric conductivity, heat conduction and other properties of the pure aluminum can not cause obvious change of the characteristics of the magnesium alloy, and the proper thickness can be obtained through multiple deposition.
4. According to the repair method for the corrosion damage of the magnesium alloy casing, the damage part of the magnesium alloy casing is repaired by adopting a cold spraying mode, the cold spraying temperature is low, the thermal influence on a matrix material is remarkably reduced, in addition, residual compressive stress is generated by cold spraying, and the fatigue resistance and corrosion resistance of the repaired magnesium alloy casing can be improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flowchart of a method for repairing corrosion damage to a magnesium alloy case according to some embodiments of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
In addition, the technical features of the different embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
Referring to fig. 1, the invention provides a repair method suitable for corrosion damage of a magnesium alloy casing, which comprises the following steps:
step S100: carrying out nondestructive testing and surface pretreatment on the magnesium alloy casing: removing corrosion products and surface cracks on the surface of the magnesium alloy case by combining with a nondestructive testing result;
specifically, the nondestructive testing includes ultrasonic testing or eddy current testing, and the specific testing method is not limited by the present invention, and in some embodiments of the present invention, the magnesium alloy casing is subjected to hole detection by an endoscope to obtain the position and the area size of the damaged portion. After the specific position and the specific area size of the damaged part are obtained, a tool such as sand paper is used for removing corrosion products and surface cracks on the surface of the magnesium alloy casing.
It will be appreciated that in some embodiments of the present invention, after non-destructive testing and surface pretreatment, mechanical analysis of the magnesium alloy case is performed in combination with the area of the damaged portion as a percentage of the cross section of the magnesium alloy case where it was damaged. When the area of the damaged part is less than or equal to 10% of the section of the damaged magnesium alloy case, the magnesium alloy case can be maintained, and the strength performance after maintenance meets the strength requirement. When the area of the damaged part accounts for more than 10% of the section of the magnesium alloy casing, the magnesium alloy casing is not suitable for maintenance, and the strength performance after maintenance cannot meet the strength requirement. The maintenance feasibility analysis can reduce invalid work and improve work efficiency.
Step S200: after finishing maintenance feasibility assessment, carrying out scanning modeling on the damaged part of the maintainable magnesium alloy case, namely carrying out laser scanning on the damaged part after removing surface corrosion products and surface cracks, and constructing a curved surface model;
specifically, after corrosion products are removed from the surface of a damaged part, the damaged part is scanned through a 3D laser scanning device to obtain defect point clouds of the damaged part, parameters of control points of a primary machining surface are generated, the parameters are used as optimization variables, additive manufacturing requirements are used as constraint conditions, and a curved surface model is formed through optimization of three-dimensional modeling software. It will be appreciated that the three-dimensional modeling software includes UG, 3DMax, etc., and the specific type of three-dimensional modeling software is not a limitation of the present invention.
The large-size magnesium alloy case cannot be measured only by using 3D scanning equipment, and the curved surface shape of the damaged part is directly obtained only through the scanned point cloud, so that the precision is too high and the calculated amount is too large. And the three-dimensional scanning technology is combined with three-dimensional modeling software to build a model of the damaged part, so that the defect information of the damaged part is rapidly and accurately obtained in a software optimization mode, and the data volume calculation is reduced.
Step S300: constructing a curved surface shape to be processed at the damaged part according to the curved surface model, and machining the curved surface shape to obtain a spraying base surface;
specifically, the magnesium alloy casing is installed on a numerical control machine tool, and the magnesium alloy casing can be machined by using a five-axis numerical control machine tool. And constructing a curved surface shape to be processed according to the optimized model data at the damaged part of the magnesium alloy casing, and milling by using a milling cutter to obtain a spraying base surface meeting the angle of the surface to be deposited and smooth transition.
Because the magnesium alloy casing has higher dimensional accuracy and strength requirements, on one hand, the surface of corrosion oxidation is eliminated completely, on the other hand, the cutting depth is reduced, the damaged part is polished through sand paper in the prior art, the milling size cannot be controlled accurately, the cutting depth is too deep after polishing easily, the strength of the magnesium alloy casing after repairing is influenced, in addition, the time consumption is long, the maintenance efficiency is reduced, and the cost is increased by controlling the sand paper manually to process the damaged part. In some embodiments of the invention, the damaged part of the magnesium alloy casing is machined in a machining mode, so that the cutting depth is accurately controlled, the strength is ensured, and the working efficiency is improved.
It will be appreciated that in some embodiments of the invention, after the sprayed base is obtained, the sprayed base is roughened by sand blasting, and the roughened sprayed base has a surface roughness of Ra 3-5.
Specifically, the parameters of the sand blasting coarsening process are that the pressure is 0.3-0.5 MPa, and the sand blasting distance is as follows: 30-50 mm, the sand blasting angle is 90 degrees+/-10 degrees, and the sand blasting coverage rate is 100%.
The sand blasting coarsening can remove pollutants on the spraying base surface, such as flying scraps generated in the processing process of the spraying base surface, and in addition, the sand blasting coarsening can increase the roughness of the spraying base surface, increase the contact area between the coating and the spraying base surface and improve the adhesive force of the coating.
In some embodiments of the invention, after the sandblasting roughening, the sprayed base surface is surface cleaned by a cleaning machine, the surface cleaning time and the cold spray repair time being less than or equal to 4 hours.
Specifically, the dry ice cleaning machine is used for cleaning the surface of the spraying basal plane, particles and surface dust attached to the spraying basal plane in the sand blasting process are removed, the interval between the surface cleaning time and the cold spraying repair time is not more than 4 hours, and the situation that the dust is attached to the spraying basal plane again to influence the combination of the coating and the spraying basal plane is avoided.
Step S400: cold spraying additive repairing; after the surface of the spraying base surface is cleaned, cold spraying material adding and repairing are carried out on the spraying base surface through cold spraying equipment, and the thickness of a deposition layer is higher than the original size of the magnesium alloy case;
specifically, in some embodiments of the present invention, the cold spray raw material is a pure aluminum metal powder having a particle size of 20 to 53 μm.
The pure aluminum metal powder is used as spraying powder, the damaged part is repaired in a cold spraying mode, the pure aluminum has excellent corrosion resistance, the galvanic corrosion driving force with the magnesium alloy is small, the properties of the pure aluminum such as low density, high electric conductivity and heat conduction cannot cause obvious change of the magnesium alloy characteristics, and the proper thickness can be obtained through multiple deposition.
In some embodiments of the invention, the spraying uses an inert gas as the powder driving gas, and the spraying parameters are: the air flow pressure is 3-5 MPa, the spraying temperature is 350-550 ℃, the spraying distance is 20-50 mm, and the powder feeding rate is 10-50 g/min.
It is understood that the inert gas may be nitrogen or neon, and the kind of inert gas is not limited by the present invention. The sprayed deposition layer is 0.8-5mm higher than the surface to be repaired of the magnesium alloy casing by means of cold spraying, so that enough allowance is left in the process of subsequent machining and polishing.
Step S500: finish machining of the surface of a damaged part: milling the deposited layer by machining to obtain the initial shape and size of the magnesium alloy casing;
specifically, milling is performed on the deposition layer of the additive according to the original shape and size of the magnesium alloy casing so as to recover the appearance and size of the magnesium alloy casing.
Step S600: surface treatment and performance detection: and carrying out local or whole surface treatment on the repaired magnesium alloy casing, and checking the strength performance of the magnesium alloy casing.
Specifically, after the appearance and the size of the magnesium alloy casing are restored, the ultrasonic flaw detection and the penetration detection are combined to perform surface and internal defect detection on the magnesium alloy casing, and the magnesium alloy casing after repair and detection is subjected to local or whole surface treatment and coating to detect whether the performance of the magnesium alloy casing subjected to cold spraying repair meets the use requirement.
According to the repair method suitable for corrosion damage of the magnesium alloy casing, nondestructive testing is carried out on the magnesium alloy casing, after a damaged part is determined, corrosion products and surface cracks on the surface of the damaged part are removed, laser scanning is carried out on the damaged part through a three-dimensional scanning technology, a curved surface model is constructed through point cloud data obtained through scanning, the curved surface shape of the surface to be repaired is rapidly and accurately obtained according to optimized parameters of the curved surface model, machining is carried out on the curved surface shape to obtain a spraying base surface, then cold spraying additive repair is carried out on the spraying base surface through a cold spraying technology, so that a deposition layer is formed on the spraying base surface by raw material powder, the surface of the deposition layer and the surface of the magnesium alloy casing are leveled through milling of the deposition layer, and after partial or whole surface treatment is carried out on the repaired magnesium alloy casing, the strength performance is inspected. According to the repairing method, the damaged part is subjected to model reconstruction by a three-dimensional scanning modeling technology, so that defect information of the damaged part is quickly and accurately obtained, machining treatment is carried out on the damaged part according to the defect information, and therefore, during subsequent cold spraying, the additive can be better combined with a spraying base surface, and the strength performance after repairing is improved.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the invention.
Claims (10)
1. The repair method suitable for the corrosion damage of the magnesium alloy casing is characterized by comprising the following steps of:
nondestructive testing and surface pretreatment: removing corrosion products and surface cracks on the surface of the magnesium alloy case by combining with a nondestructive testing result;
and (3) scanning modeling: carrying out laser scanning on the damaged part after removing the surface corrosion products and the surface cracks, and constructing a curved surface model;
constructing a curved surface shape and processing a spraying base surface: constructing a curved surface shape to be processed at the damaged part according to the curved surface model, and machining the curved surface shape to obtain a spraying base surface;
cold spray additive repair: carrying out cold spraying repair on the spraying basal plane, wherein the thickness of a sprayed deposition layer is higher than the surface height of the original magnesium alloy case;
finish machining of the surface of a damaged part: milling the deposited layer by machining to obtain the initial shape and size of the magnesium alloy casing;
surface treatment and performance detection: and carrying out local or whole surface treatment on the repaired magnesium alloy casing, and checking the quality of the surface repair coating of the magnesium alloy casing.
2. The repair method for corrosion damage of magnesium alloy casing according to claim 1, wherein after performing nondestructive testing and surface pretreatment, mechanical analysis is performed on the magnesium alloy casing in combination with the percentage of the area of the damaged part to the section of the magnesium alloy casing where the damage is located.
3. The repair method for corrosion damage of magnesium alloy casing according to claim 2, wherein the area of the damaged portion after the pretreatment is less than or equal to 10% of the cross section of the damaged portion of the magnesium alloy casing.
4. The repair method for corrosion damage of magnesium alloy casing according to claim 1 or 2, wherein in the scan modeling, a defect point cloud of the damaged portion is obtained through a 3D scan device, and the curved surface model is constructed through three-dimensional modeling software according to the defect point cloud.
5. The repair method for corrosion damage of magnesium alloy casing according to claim 1, wherein in the construction of the curved surface shape and the processing of the spraying base surface, machining is performed on the damaged portion according to parameters of the curved surface shape by a numerical control machine tool to obtain the spraying base surface.
6. The repair method for corrosion damage of magnesium alloy casing according to claim 1, wherein after the spraying base surface is obtained, sand blasting roughening is performed on the spraying base surface, and the surface roughness of the roughened spraying base surface is Ra 3-5.
7. The repair method for corrosion damage of magnesium alloy casing according to claim 6, wherein the sandblasting roughening process parameter is pressure 0.3-0.5 MPa, sandblasting distance: 30-50 mm, the sand blasting angle is 90 degrees+/-10 degrees, and the sand blasting coverage rate is 100%.
8. The method for repairing corrosion damage of a magnesium alloy receiver according to claim 7, wherein after the sand blasting coarsening, the sprayed base surface is subjected to surface cleaning by a cleaning machine, and the interval between the surface cleaning time and the cold spraying repair time is less than or equal to 4 hours.
9. The repair method for corrosion damage of magnesium alloy casing according to claim 1, wherein the cold spray raw material is pure aluminum metal powder, and the granularity of the pure aluminum metal powder is 20-53 μm.
10. The repair method for corrosion damage of magnesium alloy casing according to claim 9, wherein the cold spraying adopts inert gas as powder driving gas, and the spraying parameters are: the air flow pressure is 3-5 MPa, the spraying temperature is 350-550 ℃, the spraying distance is 20-50 mm, and the powder feeding rate is 10-50 g/min.
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| CN202310315603.XA CN116329569A (en) | 2023-03-27 | 2023-03-27 | Repair method suitable for corrosion damage of magnesium alloy casing |
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| CN202310315603.XA CN116329569A (en) | 2023-03-27 | 2023-03-27 | Repair method suitable for corrosion damage of magnesium alloy casing |
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