CN114559373B - Repair method for through hole damage of aluminum alloy part - Google Patents
Repair method for through hole damage of aluminum alloy part Download PDFInfo
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- CN114559373B CN114559373B CN202210042807.6A CN202210042807A CN114559373B CN 114559373 B CN114559373 B CN 114559373B CN 202210042807 A CN202210042807 A CN 202210042807A CN 114559373 B CN114559373 B CN 114559373B
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- Prior art keywords
- spraying
- coating
- sand blasting
- repaired
- cold
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- 238000000034 method Methods 0.000 title claims abstract description 31
- 230000008439 repair process Effects 0.000 title claims abstract description 12
- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 10
- 238000005507 spraying Methods 0.000 claims abstract description 34
- 239000011248 coating agent Substances 0.000 claims abstract description 32
- 238000000576 coating method Methods 0.000 claims abstract description 32
- 238000010288 cold spraying Methods 0.000 claims abstract description 20
- 238000005498 polishing Methods 0.000 claims abstract description 15
- 239000000843 powder Substances 0.000 claims abstract description 11
- 230000007547 defect Effects 0.000 claims abstract description 8
- 239000002245 particle Substances 0.000 claims abstract description 8
- 238000004140 cleaning Methods 0.000 claims abstract description 7
- 238000005488 sandblasting Methods 0.000 claims description 29
- 230000008569 process Effects 0.000 claims description 19
- 239000007921 spray Substances 0.000 claims description 11
- 238000007664 blowing Methods 0.000 claims description 10
- 239000004576 sand Substances 0.000 claims description 8
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 6
- 239000011159 matrix material Substances 0.000 claims description 6
- 239000002390 adhesive tape Substances 0.000 claims description 5
- 230000003746 surface roughness Effects 0.000 claims description 4
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 3
- 229910052593 corundum Inorganic materials 0.000 claims description 3
- 239000010431 corundum Substances 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 238000011179 visual inspection Methods 0.000 claims description 3
- 230000008021 deposition Effects 0.000 abstract description 8
- 230000000694 effects Effects 0.000 abstract description 5
- 230000002159 abnormal effect Effects 0.000 abstract description 2
- 238000000465 moulding Methods 0.000 abstract description 2
- 239000011148 porous material Substances 0.000 abstract description 2
- 238000005422 blasting Methods 0.000 abstract 1
- 238000003754 machining Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229910000746 Structural steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000002932 luster Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C1/00—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/04—Cleaning involving contact with liquid
- B08B3/08—Cleaning involving contact with liquid the liquid having chemical or dissolving effect
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B5/00—Cleaning by methods involving the use of air flow or gas flow
- B08B5/02—Cleaning by the force of jets, e.g. blowing-out cavities
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C11/00—Selection of abrasive materials or additives for abrasive blasts
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C24/00—Coating starting from inorganic powder
- C23C24/02—Coating starting from inorganic powder by application of pressure only
- C23C24/04—Impact or kinetic deposition of particles
-
- 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
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
Abstract
The invention relates to a repair method for through hole damage of an aluminum alloy part, which comprises the following steps: the first step: polishing defects; and a second step of: cleaning the surface; and a third step of: surface protection; fourth step: blasting the surface; fifth step: a fixed support plate; sixth step: cold spraying; seventh step: removing the supporting plate after the cold spraying is finished; eighth step: and (3) polishing the cold sprayed coating to restore the size and the shape of the part, checking the coating, and removing the coating if the coating is unqualified. According to the invention, the problem that powder particles cannot form a coating through impact due to the lack of support at the bottom of a part to be repaired is solved by utilizing the support plate and cold spraying repair. The invention limits the angle of the U-shaped groove and the spraying, improves the deposition effect and the compactness of the coating, and prevents the occurrence of deposition blocks which cannot be deposited, have overlarge pores or are abnormal, so as to cause the failure of molding.
Description
Technical Field
The invention relates to the technical field of cold spraying remanufacturing, in particular to a method for repairing through hole damage of an aluminum alloy part.
Background
Through-hole type damage is the most extreme type of damage condition in aluminum alloy part repair, and is generally caused by several reasons: firstly, internal defects exist in the part manufacturing process, the defects expand and penetrate through a matrix in the use process, and holes appear after the defects are completely removed; secondly, the operation is improper in the repairing process, and the defect is removed or secondary damage is generated in the repairing process, so that the part has a through hole; and thirdly, parts such as original threads of parts, positioning pin holes and the like are excessively worn and cannot be repaired, the through hole structure is required to be plugged, and the threaded holes and the pin holes are re-drilled in a machining mode. The deposition mechanism of the cold spray coating is that powder particles exceeding a critical speed are accelerated to collide with a matrix, and the particles are deposited to form a coating through strong plastic deformation, so that the coating cannot effectively collide and be deposited at the bottom of the through hole structure.
Disclosure of Invention
In order to solve the technical problems, the invention provides a repair method for the damage of the through holes of the aluminum alloy parts. The technical problems to be solved by the invention are realized by adopting the following technical scheme:
a repair method for through hole damage of aluminum alloy parts comprises the following steps: the first step: polishing defects, namely polishing damaged parts into U-shaped grooves, wherein the opening angle of the grooves is 80-120 degrees;
and a second step of: cleaning the surface, namely blowing the polished part by compressed air, and cleaning the part by alcohol or acetone after blowing;
and a third step of: surface protection: the HVMT high-temperature shielding adhesive tape is used for protecting the non-spraying part of the part;
fourth step: surface sand blasting: only blowing sand to roughen the surface to be repaired, and completely covering the surface to be repaired by the sand blasting area;
fifth step: the support plate is fixed, a support plate structure is added on the back of the through hole to be repaired and fixed, and the support plate is taken down after spraying is finished;
sixth step: cold spraying, namely cold spraying is carried out on the surface to be repaired, and the position of the spray gun is changed according to the polishing condition of the surface to be repaired so as to ensure that the included angle between the axis of the spray gun and the spraying plane is 70-90 degrees;
seventh step: removing the supporting plate after the cold spraying is finished;
eighth step: and (3) polishing the cold sprayed coating to restore the size and the shape of the part, checking the coating, and removing the coating if the coating is unqualified.
The sand blasting gun continuously and uniformly moves during sand blasting, and the residence time on the part is not more than 15 seconds.
The sand blasting process parameters are as follows:
type of gravel: brown corundum sand;
grit size: 60 to 80 mesh;
sand blasting pressure: 0.25MPa to 0.45MPa;
sand blasting distance: 100mm to 150mm;
roughness after sandblasting: ra5.0 μm to 7.6 μm.
The support plate is made of hard metal and the surface roughness of the support plate after processing should not be inferior to Ra 0.8 μm.
The cold spraying process parameters are as follows:
spraying powder: al+Al 2 O 3 Mixing powder with the particle size of 5-45 μm by mechanical mixing method;
spraying process gas: 99.99% high purity N 2 ；
The spraying process temperature is as follows: 300 ℃ to 350 ℃;
the spraying process pressure is as follows: 150psi to 200psi;
spraying distance: 15mm to 25mm.
Visual inspection and dye check are adopted for the polished parts, the coating should have no warpage, peeling, falling and cracks, and the closed check display of the lap joint part of the coating and the matrix is regarded as normal.
The beneficial effects of the invention are as follows: according to the invention, the problem that powder particles cannot form a coating through impact due to the lack of support at the bottom of a part to be repaired is solved by utilizing the support plate and cold spraying repair. The invention limits the angle of the U-shaped groove and the spraying, improves the deposition effect and the compactness of the coating, and prevents the occurrence of deposition blocks which cannot be deposited, have overlarge pores or are abnormal, so as to cause the failure of molding.
Drawings
The invention will be further described with reference to the drawings and examples.
FIG. 1 is a schematic view of through-hole damage according to the present invention;
FIG. 2 is a schematic diagram of the cold spray repair of the present invention.
Detailed Description
In order to make the technical solution of the present invention better understood by a person skilled in the art, the present invention will be more clearly and more fully described below with reference to the accompanying drawings in the embodiments, and of course, the described embodiments are only a part of, but not all of, the present invention, and other embodiments obtained by a person skilled in the art without making any inventive effort are within the scope of the present invention.
A repair method for through hole damage of aluminum alloy parts comprises the following steps: the first step: defect polishing, namely polishing a damaged part of the part into a U-shaped groove, wherein the opening angle of the groove is 80-120 degrees for ensuring the combination property of the coating and the deposition effect;
and a second step of: cleaning the surface, namely blowing the polished part by compressed air, and cleaning the part by alcohol or acetone after blowing;
and a third step of: surface protection: the HVMT high-temperature shielding adhesive tape is used for protecting the non-spraying part of the part; the temperature of the spraying process is 300-350 ℃, so that the shielding adhesive tape which is not high-temperature resistant is damaged or melted, the surface to be repaired is polluted, and the repair is failed;
fourth step: surface sand blasting: only blowing sand to roughen the surface to be repaired, and completely covering the surface to be repaired by the sand blasting area; the surface after sand blasting should be rough and uniform, and have no luster and dark spots; after the sand blasting is finished, blowing away residual sand grains by clean and dry compressed air;
fifth step: the support plate is fixed, a support plate structure is added on the back of the through hole to be repaired and fixed, and the support plate is taken down after spraying is finished; the supporting plate can be adhered by adopting a fixture, or can be adhered by adopting a 3M glass cloth adhesive tape or other modes with the same effect so as to be clung to the part with the spraying function;
sixth step: cold spraying, namely cold spraying is carried out on the surface to be repaired, and the position of the spray gun is changed according to the polishing condition of the surface to be repaired so as to ensure that the included angle between the axis of the spray gun and the spraying plane is 70-90 degrees; because the damaged part is ground into a U-shaped groove, the groove is between 80 and 120 degrees, and when different surfaces are sprayed, the included angle between the axis of the spray gun and the spraying plane is always kept between 70 and 90 degrees; as shown in fig. 1 to 2, 1 is a cold spraying spray gun, 2 is a part damage part, 3 is a supporting plate structure, and 4 is a U-shaped groove included angle; because the included angle exists in the U-shaped groove, the cold spraying spray gun 1 in fig. 2 adjusts different positions for different spraying surfaces, and the included angle between the axis of the spray gun and the spraying plane is always between 70 degrees and 90 degrees.
Seventh step: removing the supporting plate after the cold spraying is finished; after the spraying is finished, loosening the fixing of the supporting plate, knocking the supporting plate from the side surface by using a hammer and a copper rod, and taking down the supporting plate after the supporting plate is separated from the coating; the contact part of the support plate and the coating layer does not allow sand blasting;
eighth step: polishing the cold sprayed coating to restore the size and the shape of the part, checking the coating, and removing the coating if the coating is unqualified; and machining the redundant coating by using a machine tool, a polishing tool or a file, and recovering the size and the shape of the part according to pattern requirements.
The sand blasting gun continuously and uniformly moves during sand blasting, so that the surface treatment uniformity of the part is ensured, and uneven connection parts after cold spraying are prevented; the residence time of the sand blasting gun on the part is not more than 15 seconds, so that the damage to the surface of the part caused by the overlong time is prevented.
The sand blasting process parameters are as follows:
type of gravel: brown corundum sand; the sand grains should be dry, free of oil stains and other impurities;
grit size: 60 to 80 mesh;
sand blasting pressure: 0.25MPa to 0.45MPa;
sand blasting distance: 100mm to 150mm;
roughness after sandblasting: ra5.0 μm to 7.6 μm; the surface roughness of the sprayed part after sand blasting should be controlled to be Ra5.0-7.6 μm to further ensure the combination of the coating and the matrix.
The supporting plate is made of hard metal, the surface roughness of the processed supporting plate is not inferior to Ra 0.8 mu m, powder particles can be further prevented from being adhered to the supporting plate, the hardness of the supporting plate is too low or the adhesion between powder and the supporting plate is easily increased due to the too rough surface, and the supporting plate is difficult to take off; the supporting plate can be processed by adopting materials such as hard aluminum alloy, structural steel, high-strength steel and the like.
The cold spraying process parameters are as follows:
spraying powder: al+Al 2 O 3 Mixing powder with the particle size of 5-45 μm by mechanical mixing method;
spraying process gas: 99.99% high purity N 2 ；
The spraying process temperature is as follows: 300 ℃ to 350 ℃;
the spraying process pressure is as follows: 150psi to 200psi;
spraying distance: 15mm to 25mm.
The technological parameters have good deposition efficiency and deposition effect, so that the density of the spray coating is high.
Visual inspection and dye check are adopted for the polished parts, the coating should have no warpage, peeling, falling and cracks, and the closed check display of the lap joint part of the coating and the matrix is regarded as normal.
The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (1)
1. A repair method for through hole damage of aluminum alloy parts is characterized by comprising the following steps: the method comprises the following steps: the first step: polishing defects, namely polishing damaged parts into U-shaped grooves, wherein the opening angle of the grooves is 80-120 degrees;
and a second step of: cleaning the surface, namely blowing the polished part by compressed air, and cleaning the part by alcohol or acetone after blowing;
and a third step of: surface protection: the HVMT high-temperature shielding adhesive tape is used for protecting the non-spraying part of the part;
fourth step: surface sand blasting: only blowing sand to roughen the surface to be repaired, and completely covering the surface to be repaired by the sand blasting area;
fifth step: the support plate is fixed, a support plate structure is added on the back of the through hole to be repaired and fixed, and the support plate is taken down after spraying is finished;
sixth step: cold spraying, namely cold spraying is carried out on the surface to be repaired, and the position of the spray gun is changed according to the polishing condition of the surface to be repaired so as to ensure that the included angle between the axis of the spray gun and the spraying plane is 70-90 degrees;
seventh step: removing the supporting plate after the cold spraying is finished;
eighth step: polishing the cold sprayed coating to restore the size and the shape of the part, checking the coating, and removing the coating if the coating is unqualified;
the sand blasting gun continuously and uniformly moves during sand blasting, and the residence time on the part is not more than 15 seconds;
the sand blasting process parameters are as follows:
type of gravel: brown corundum sand;
grit size: 60 to 80 mesh;
sand blasting pressure: 0.25MPa to 0.45MPa;
sand blasting distance: 100mm to 150mm;
roughness after sandblasting: ra5.0 μm to 7.6 μm;
the supporting plate is made of hard metal, and the surface roughness of the processed supporting plate is not inferior to Ra 0.8 mu m;
the cold spraying process parameters are as follows:
spraying powder: al+Al 2 O 3 Mixing powder with the particle size of 5-45 μm by mechanical mixing method;
spraying process gas: 99.99% high purity N 2 ；
The spraying process temperature is as follows: 300 ℃ to 350 ℃;
the spraying process pressure is as follows: 150psi to 200psi;
spraying distance: 15mm to 25mm;
visual inspection and dye check are adopted for the polished parts, the coating should have no warpage, peeling, falling and cracks, and the closed check display of the lap joint part of the coating and the matrix is regarded as normal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210042807.6A CN114559373B (en) | 2022-01-14 | 2022-01-14 | Repair method for through hole damage of aluminum alloy part |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210042807.6A CN114559373B (en) | 2022-01-14 | 2022-01-14 | Repair method for through hole damage of aluminum alloy part |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114559373A CN114559373A (en) | 2022-05-31 |
| CN114559373B true CN114559373B (en) | 2023-10-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210042807.6A Active CN114559373B (en) | 2022-01-14 | 2022-01-14 | Repair method for through hole damage of aluminum alloy part |
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| Country | Link |
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| CN (1) | CN114559373B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115646953A (en) * | 2022-12-12 | 2023-01-31 | 山西航天清华装备有限责任公司 | Environment-friendly cleaning method for paint film coating welding bead |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5915743A (en) * | 1997-06-30 | 1999-06-29 | The Boeing Company | Metal spray tool repair system |
| CN106756979A (en) * | 2016-12-29 | 2017-05-31 | 西安交通大学 | The cold spray welding method of dissimilar metal strength of joint is improved based on interface pinning effect |
| CN106939421A (en) * | 2017-02-16 | 2017-07-11 | 中国船舶重工集团公司第七二五研究所 | A kind of low pressure cold spray repairing method of Al-alloy casing |
| CN110480254A (en) * | 2019-08-03 | 2019-11-22 | 国营芜湖机械厂 | A kind of restorative procedure of aircraft fuel system alusil alloy shell cast defect |
| CN112095099A (en) * | 2020-09-11 | 2020-12-18 | 广东工业大学 | Cold spraying device for nano particles |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016115248A1 (en) * | 2015-01-16 | 2016-07-21 | Sikorsky Aircraft Corporation | Cold spray method to join or in certain cases strengthen metals |
-
2022
- 2022-01-14 CN CN202210042807.6A patent/CN114559373B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5915743A (en) * | 1997-06-30 | 1999-06-29 | The Boeing Company | Metal spray tool repair system |
| CN106756979A (en) * | 2016-12-29 | 2017-05-31 | 西安交通大学 | The cold spray welding method of dissimilar metal strength of joint is improved based on interface pinning effect |
| CN106939421A (en) * | 2017-02-16 | 2017-07-11 | 中国船舶重工集团公司第七二五研究所 | A kind of low pressure cold spray repairing method of Al-alloy casing |
| CN110480254A (en) * | 2019-08-03 | 2019-11-22 | 国营芜湖机械厂 | A kind of restorative procedure of aircraft fuel system alusil alloy shell cast defect |
| CN112095099A (en) * | 2020-09-11 | 2020-12-18 | 广东工业大学 | Cold spraying device for nano particles |
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| CN114559373A (en) | 2022-05-31 |
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