CN110284142B - Aluminum radiator with improved riveting structure and riveting method - Google Patents
Aluminum radiator with improved riveting structure and riveting method Download PDFInfo
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- CN110284142B CN110284142B CN201910672198.0A CN201910672198A CN110284142B CN 110284142 B CN110284142 B CN 110284142B CN 201910672198 A CN201910672198 A CN 201910672198A CN 110284142 B CN110284142 B CN 110284142B
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- riveting
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- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 269
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 269
- 238000000034 method Methods 0.000 title claims abstract description 57
- 238000002161 passivation Methods 0.000 claims abstract description 130
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims abstract description 50
- 239000000463 material Substances 0.000 claims abstract description 35
- 239000007787 solid Substances 0.000 claims abstract description 30
- 230000004888 barrier function Effects 0.000 claims abstract description 24
- 230000004913 activation Effects 0.000 claims abstract description 18
- 239000010410 layer Substances 0.000 claims description 272
- 239000003814 drug Substances 0.000 claims description 115
- 239000007788 liquid Substances 0.000 claims description 115
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 96
- 239000000758 substrate Substances 0.000 claims description 83
- 238000005406 washing Methods 0.000 claims description 78
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 60
- 230000003647 oxidation Effects 0.000 claims description 50
- 238000007254 oxidation reaction Methods 0.000 claims description 50
- 239000013078 crystal Substances 0.000 claims description 44
- 230000017525 heat dissipation Effects 0.000 claims description 43
- 230000008569 process Effects 0.000 claims description 39
- 239000002253 acid Substances 0.000 claims description 32
- 239000012790 adhesive layer Substances 0.000 claims description 29
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 28
- 239000002585 base Substances 0.000 claims description 28
- 238000005238 degreasing Methods 0.000 claims description 26
- 238000006386 neutralization reaction Methods 0.000 claims description 25
- 238000002791 soaking Methods 0.000 claims description 21
- 239000000853 adhesive Substances 0.000 claims description 20
- 238000007743 anodising Methods 0.000 claims description 20
- 238000003754 machining Methods 0.000 claims description 20
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 18
- 238000001994 activation Methods 0.000 claims description 18
- 210000004877 mucosa Anatomy 0.000 claims description 17
- 239000003513 alkali Substances 0.000 claims description 16
- 239000012535 impurity Substances 0.000 claims description 12
- 210000004400 mucous membrane Anatomy 0.000 claims description 11
- 239000004576 sand Substances 0.000 claims description 11
- 238000007789 sealing Methods 0.000 claims description 10
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims description 9
- 230000000694 effects Effects 0.000 claims description 9
- 239000003995 emulsifying agent Substances 0.000 claims description 9
- 239000001509 sodium citrate Substances 0.000 claims description 9
- NLJMYIDDQXHKNR-UHFFFAOYSA-K sodium citrate Chemical compound O.O.[Na+].[Na+].[Na+].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O NLJMYIDDQXHKNR-UHFFFAOYSA-K 0.000 claims description 9
- LGQLOGILCSXPEA-UHFFFAOYSA-L nickel sulfate Chemical compound [Ni+2].[O-]S([O-])(=O)=O LGQLOGILCSXPEA-UHFFFAOYSA-L 0.000 claims description 8
- 229910000363 nickel(II) sulfate Inorganic materials 0.000 claims description 8
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 7
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 claims description 7
- 239000004327 boric acid Substances 0.000 claims description 7
- 238000004140 cleaning Methods 0.000 claims description 7
- 238000001035 drying Methods 0.000 claims description 7
- 230000003472 neutralizing effect Effects 0.000 claims description 7
- 229910017604 nitric acid Inorganic materials 0.000 claims description 7
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 6
- 239000000654 additive Substances 0.000 claims description 6
- 230000000996 additive effect Effects 0.000 claims description 6
- 238000000151 deposition Methods 0.000 claims description 6
- 230000001070 adhesive effect Effects 0.000 claims description 5
- 238000002425 crystallisation Methods 0.000 claims description 5
- 230000008025 crystallization Effects 0.000 claims description 5
- 230000003213 activating effect Effects 0.000 claims description 4
- MNNHAPBLZZVQHP-UHFFFAOYSA-N diammonium hydrogen phosphate Chemical compound [NH4+].[NH4+].OP([O-])([O-])=O MNNHAPBLZZVQHP-UHFFFAOYSA-N 0.000 claims description 4
- 229910000388 diammonium phosphate Inorganic materials 0.000 claims description 4
- 235000019838 diammonium phosphate Nutrition 0.000 claims description 4
- 239000003381 stabilizer Substances 0.000 claims description 4
- 229910021555 Chromium Chloride Inorganic materials 0.000 claims description 3
- DBMJMQXJHONAFJ-UHFFFAOYSA-M Sodium laurylsulphate Chemical compound [Na+].CCCCCCCCCCCCOS([O-])(=O)=O DBMJMQXJHONAFJ-UHFFFAOYSA-M 0.000 claims description 3
- 230000009471 action Effects 0.000 claims description 3
- QSWDMMVNRMROPK-UHFFFAOYSA-K chromium(3+) trichloride Chemical compound [Cl-].[Cl-].[Cl-].[Cr+3] QSWDMMVNRMROPK-UHFFFAOYSA-K 0.000 claims description 3
- 238000009957 hemming Methods 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 239000011148 porous material Substances 0.000 claims description 3
- WFIZEGIEIOHZCP-UHFFFAOYSA-M potassium formate Chemical compound [K+].[O-]C=O WFIZEGIEIOHZCP-UHFFFAOYSA-M 0.000 claims description 3
- 150000001875 compounds Chemical class 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 claims description 2
- 239000002352 surface water Substances 0.000 claims description 2
- 238000009825 accumulation Methods 0.000 claims 1
- 229910052751 metal Inorganic materials 0.000 description 12
- 239000002184 metal Substances 0.000 description 12
- 229920000715 Mucilage Polymers 0.000 description 6
- 239000002313 adhesive film Substances 0.000 description 5
- 230000008602 contraction Effects 0.000 description 3
- 238000001125 extrusion Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 210000004379 membrane Anatomy 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 239000004411 aluminium Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D39/00—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders
-
- 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
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
- C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
- C23C22/48—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 not containing phosphates, hexavalent chromium compounds, fluorides or complex fluorides, molybdates, tungstates, vanadates or oxalates
- C23C22/56—Treatment of aluminium or alloys based thereon
-
- 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
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/82—After-treatment
-
- 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
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/12—Light metals
- C23G1/125—Light metals aluminium
-
- 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
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/14—Cleaning or pickling metallic material with solutions or molten salts with alkaline solutions
- C23G1/22—Light metals
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
- C25D11/02—Anodisation
- C25D11/04—Anodisation of aluminium or alloys based thereon
- C25D11/06—Anodisation of aluminium or alloys based thereon characterised by the electrolytes used
- C25D11/08—Anodisation of aluminium or alloys based thereon characterised by the electrolytes used containing inorganic acids
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
- C25D11/02—Anodisation
- C25D11/04—Anodisation of aluminium or alloys based thereon
- C25D11/18—After-treatment, e.g. pore-sealing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F21/00—Constructions of heat-exchange apparatus characterised by the selection of particular materials
- F28F21/08—Constructions of heat-exchange apparatus characterised by the selection of particular materials of metal
- F28F21/081—Heat exchange elements made from metals or metal alloys
- F28F21/084—Heat exchange elements made from metals or metal alloys from aluminium or aluminium alloys
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F3/00—Plate-like or laminated elements; Assemblies of plate-like or laminated elements
- F28F3/02—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations
- F28F3/06—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations the means being attachable to the element
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
- F28F9/26—Arrangements for connecting different sections of heat-exchange elements, e.g. of radiators
- F28F9/262—Arrangements for connecting different sections of heat-exchange elements, e.g. of radiators for radiators
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F2275/00—Fastening; Joining
- F28F2275/12—Fastening; Joining by methods involving deformation of the elements
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Materials Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Electrochemistry (AREA)
- Inorganic Chemistry (AREA)
- Cooling Or The Like Of Semiconductors Or Solid State Devices (AREA)
Abstract
The invention discloses an aluminum radiator with an improved riveting structure and a riveting method, wherein a surface of a riveting part of a radiating aluminum fin is subjected to surface activation treatment, a solid barrier layer and a Kong Nianzhi layer are arranged on the surface of the riveting part, an aluminum oxide passivation film layer is attached to the surface of a riveting groove of an aluminum base material after the surface passivation treatment, the riveting part is in interference fit with the riveting groove after the riveting processing, a gap between the riveting part and the riveting groove is filled with a perforated mucous layer of the riveting part after the riveting deformation, and the perforated mucous layer of the riveting part is mutually engaged with the aluminum oxide passivation film layer of the riveting groove.
Description
Technical Field
The invention relates to the technical field of radiators, in particular to an aluminum radiator with an improved riveting structure and a riveting method.
Background
At present, most of the heat sinks are made of aluminum substrates, each heat sink comprises an aluminum substrate and a plurality of aluminum fins fixed on the aluminum substrate, the aluminum fins are fixed on the aluminum substrate through riveting, however, the riveting is not firm, the aluminum fins are easy to loose, the aluminum fins can be accidentally separated under the influence of external force, and in severe use environments with higher temperature or lower temperature and the like, the aluminum fins are easy to loose and accidentally separate due to thermal expansion and cold contraction, so that improvement is needed.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide the aluminum radiator with the improved riveting structure and the riveting method, which have the advantages of simple process, firm riveting, difficult structure movement or falling off and high heat conduction speed at the riveting position.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: a riveting method of an aluminum radiator comprises a radiating aluminum fin processing step, an aluminum substrate processing step and a riveting processing step,
1) A processing step of the heat dissipation aluminum fin comprises the following substeps,
1.1 Machining the radiating aluminum fins, namely machining the radiating aluminum fins by using aluminum materials to obtain a plurality of thin flaky radiating aluminum fins, wherein the lower parts of the radiating aluminum fins are respectively provided with a riveting part;
1.2 The surface activation treatment substep, shielding other outer surfaces except the riveting part on the radiating aluminum fins, then carrying out surface activity treatment on the radiating aluminum fins, or directly carrying out surface activity treatment on the radiating aluminum fins, immersing the radiating aluminum fins in a first anodic oxidation treatment tank for surface activation treatment, and attaching a non-porous solid barrier layer on at least the surface of the riveting part, wherein the non-porous solid barrier layer is a solid non-porous surface compact alumina film layer deposited on the surface of the riveting part and formed in the anodic oxidation treatment process;
1.3 A porous mucous membrane layer forming sub-step, the radiating aluminum fins taken out from the first anodizing treatment tank are directly immersed into the second anodizing treatment tank for anodizing treatment after being washed at least once, and are directly deposited on the surface of the nonporous solid barrier layer to form a self-adhesive dense distributionA porous adhesive layer with multiple micro blind holes, at least forming a porous adhesive layer with self-adhesion surface composed of a non-porous solid barrier layer and a porous adhesive layer on each surface of the rivet embedding part, wherein the surfaces of the micro blind holes are densely distributed with the porous adhesive layer, and the top surfaces of the micro blind holes respectively penetrate through the top surfaces of the porous adhesive layer, wherein the porous adhesive layer is crystalline phase structure formed in the anodic oxidation treatment process is gamma-Al 2 O 3 The complex crystal film layer is connected with the alumina compact film layer into a whole;
2) An aluminum substrate processing step comprising the substeps of,
2.1 An aluminum substrate machining sub-step, namely selecting an aluminum material for machining to obtain an aluminum substrate, wherein a plurality of riveting grooves which are arranged at intervals are formed in the riveting surface of the aluminum substrate, and the width of each riveting groove is not smaller than that of each riveting part;
2.2 Firstly shielding other outer surfaces except the riveting slots on the aluminum base material, immersing the aluminum base material into the surface passivation slots for surface passivation treatment, or directly carrying out surface passivation treatment on the aluminum base material, and forming an aluminum oxide passivation film layer on each surface of each riveting slot of the aluminum base material at least to enable each surface of each riveting slot to be in a honeycomb-shaped sand surface shape;
3) And a riveting processing step, namely cleaning the plurality of radiating aluminum fins subjected to anodic oxidation treatment in the sub-step of forming the perforated mucosal layer, then directly positioning and clamping the radiating aluminum fins subjected to anodic oxidation treatment in automatic riveting equipment or a riveting jig, cleaning the riveting caulking grooves subjected to surface passivation treatment, then directly positioning and clamping the riveting grooves or the riveting jig, firstly inserting the riveting part of each radiating aluminum fin into the corresponding riveting groove through the automatic riveting equipment at one time, riveting an aluminum base material through a riveting head of the automatic riveting equipment, and riveting and fixing the plurality of radiating aluminum fins on the same aluminum base material through one riveting action, thereby obtaining the aluminum radiator with the radiating aluminum fins which are fixed on the aluminum base material at intervals, wherein the riveting part is in interference fit with the riveting groove after the riveting processing, the gap between the riveting part and the riveting groove is filled with the perforated mucosal layer of the riveting part after the riveting deformation, and the perforated mucosal layer of the riveting part is mutually engaged with the alumina passivation film layer of the riveting groove.
In a further technical scheme, in the machining substep of the heat-dissipating aluminum fin, the riveting part is formed by machining, the lower end part of the heat-dissipating aluminum fin is reversely bent upwards and overlapped and pressed on the lower part of the heat-dissipating aluminum fin, so that a U-shaped riveting part is formed at the lower end part of the heat-dissipating aluminum fin, at least one groove which extends longitudinally for a set length or longitudinally penetrates through the riveting part is formed at the left side and the right side of the riveting part respectively, and the riveting part is in clearance fit with the riveting groove before riveting;
In the aluminum substrate machining substep, two elongated grooves which are arranged at intervals are formed on the left side and the right side of each riveting groove of the riveting surface of the aluminum substrate through machining or stamping technology, and the elongated grooves are arranged in parallel with the grooves;
in the riveting processing step, the corresponding riveting heads are respectively positioned and pre-pressed in the corresponding slender grooves in the riveting process, then downwards riveting is carried out, the deformation positions and deformation amounts of the aluminum base material and the side walls of the riveting grooves are controlled through the slender grooves, and the wall bodies at the middle upper parts of the left side wall and the right side wall of the riveting grooves are respectively embedded into the corresponding grooves;
the depth of the riveting and embedding groove is controlled to be smaller than the height of the riveting and embedding part, after the bottoms of the riveting and embedding parts are respectively inserted into the corresponding riveting and embedding grooves before riveting, the upper end parts of the riveting and embedding parts extend out of the riveting and embedding surfaces, the corresponding connected surfaces of the riveting and embedding parts are respectively tightly packed and squeezed on the side walls of the riveting and embedding parts after riveting and embedding parts are fixedly riveted and pressed in the riveting and embedding grooves, and the heat dissipation aluminum fins are respectively erected on the upper parts of the riveting and embedding surfaces of the aluminum substrates.
In a further technical scheme, in the surface passivation treatment substep of the riveting and embedding groove, the aluminum oxide passivation film layer is Al deposited on each surface of the riveting and embedding groove and formed in the surface passivation treatment process 2 O 3 Depositing a layer;
in the step of forming the perforated mucosa layer, the thickness of the formed perforated mucosa layer is controlled below 100 microns, the thickness of the perforated mucilage layer is controlled below 50 microns, and each micro blind hole is formed simultaneously in the process of forming the perforated mucilage layer and is arranged in a hexagonal symmetrical cycle in a two-dimensional plane to form a face-centered structure.
In a further technical scheme, in the substep of forming the porous mucosa layer, the porous mucilage layer is the complex crystal film layer formed and deposited on the surface of the alumina compact film layer in the anodic oxidation treatment process of canceling the hole sealing treatment process step, and the hardness of the porous mucilage layer is smaller than that of the aluminum base material;
the total thickness of the porous adhesive layer is controlled to be 20-50 microns, the thickness of the porous adhesive layer is controlled to be 10-30 microns, the average width of the miniature blind holes is controlled to be 1-5 microns, and the average depth of the miniature blind holes is controlled to be 5-20 microns;
in the surface passivation treatment sub-step of the riveting groove, the thickness of the formed aluminum oxide passivation film layer is controlled below 20 microns, a plurality of micro holes are densely arranged on the surface of the aluminum oxide passivation film layer at intervals, and each micro hole comprises at least one inwards concave micro cavity and a convex part which is protruded relative to the micro cavity and arranged around the micro cavity.
In a further embodiment, a baking step is added after the perforated mucosal layer forming sub-step,
1.4 A baking step of cleaning a plurality of heat dissipation aluminum fins subjected to anodic oxidation treatment in the sub step of forming the perforated mucosa layer, then baking the heat dissipation aluminum fins in an oven for 20-30 minutes, controlling the temperature of the oven to be 80-90 ℃ based on good heat conduction performance of the heat dissipation aluminum fins, wherein the heat conduction coefficient of the heat dissipation aluminum fins is larger than that of the band Kong Nianzhi layer, the inner parts of the micro blind holes are poor in heat conduction relative to the heat dissipation aluminum fins, the upper hole edges of the micro blind holes extend upwards and simultaneously extend towards the center part of the micro blind holes to form a first curled edge in the early stage of the baking process, and the first curled edge formed at the upper hole edges of the micro blind holes after the temperature in the micro blind holes is higher than that of the heat dissipation aluminum fins is heated is reversely curled towards the outer side along with the rising of accumulated heat in the holes of the micro blind holes, and the upper hole edges of the micro blind holes are formed into annular outer curled edges respectively, the cross section of the outer curled edges is in an S shape, and the upper hole edges of the micro blind holes are relatively enlarged;
the surface of the alumina passivation film layer is densely provided with a plurality of micro holes at intervals, each micro hole comprises at least one inwards concave micro cavity and a convex part which is opposite to the micro cavity and is arranged around the micro cavity in a convex way,
In the riveting processing step, the convex parts of the aluminum oxide passivation film layer are respectively inserted into the complex crystal film layer after the riveting processing, the complex crystal film layer is respectively inserted into the micro holes of the aluminum oxide passivation film layer, and all the interfaces of the complex crystal film layer and the aluminum oxide passivation film layer are in micro occlusion;
the upper opening of the miniature blind hole is blocked and closed by the alumina passivation film layer after riveting processing, or the convex part of the alumina passivation film layer is inserted into the upper opening of the miniature blind hole to block and close the upper opening of the miniature blind hole, so that each miniature blind hole forms a totally-enclosed closed micropore respectively;
after riveting, each outer coiled curled edge is pressed and deformed and is respectively extruded and flattened at the upper hole edge of the corresponding miniature blind hole, so as to form a closed hole ring protruding at the upper hole edge of the miniature blind hole.
In a further technical scheme, the surface activation treatment substep comprises the following substeps which are sequentially executed,
1.21 Immersing the heat-dissipating aluminum fins in an acid degreasing tank for 3-5 minutes, and removing surface impurities through the acid degreasing treatment, wherein the liquid medicine in the acid degreasing tank comprises sulfuric acid accounting for 5-15% of the total mass concentration of the liquid medicine, OP emulsifier accounting for 3-5% of the total mass concentration of the liquid medicine, sodium citrate accounting for 0.1-0.2% of the total mass concentration of the liquid medicine and the balance water; the temperature of the liquid medicine in the acid degreasing tank is controlled at 40-50 ℃;
1.22 Washing with water, removing to a clear water tank for washing at least once after the soaking time is reached;
1.23 Immersing the heat-dissipating aluminum fins in an alkaline washing tank for 10-60 seconds, wherein the liquid medicine in the alkaline washing tank comprises sodium hydroxide accounting for 15-20% of the total mass concentration of the liquid medicine and the balance of water, the temperature of the liquid medicine in the alkaline washing tank is controlled at 60-70 ℃, and the surface impurities and the residual acid are further removed through the alkaline washing treatment;
1.24 Washing with water, removing to a clear water tank for washing at least once after the soaking time is reached;
1.25 Immersing the heat-dissipating aluminum fins in a neutralization tank for 30-100 seconds, wherein the liquid medicine in the neutralization tank comprises 8-20% of nitric acid, 3-5% of neutralizing additive and the balance of water; the temperature of the liquid medicine in the neutralization tank is controlled at 20-30 ℃, and residual alkali is removed through neutralization treatment;
1.26 Activating treatment, namely immersing the radiating aluminum fins into the first anodic oxidation treatment tank for 3-5 minutes; the liquid medicine in the first anodic oxidation treatment tank comprises sulfuric acid accounting for 18-20% of the total mass concentration of the liquid medicine, nickel sulfate accounting for 0.8-2% of the total mass concentration of the liquid medicine and the balance of water; the temperature of the liquid medicine in the first anodizing treatment tank is controlled at 23-25 ℃, and the anode voltage is controlled at 13-15V; depositing a solid non-porous aluminum oxide compact film layer with compact surface on the surface of the riveting part through an anodic oxidation process, and controlling the density of the formed aluminum oxide compact film layer through nickel sulfate;
1.27 Washing with water, removing to a clear water tank for washing at least once after the soaking time is reached;
1.28 Surface activation treatment is completed.
In a further technical scheme, the sub-step of forming the mucosa layer with holes comprises the following sub-steps which are sequentially executed,
1.31 Forming a porous adhesive layer, immersing the heat-dissipating aluminum fins subjected to the activation treatment into a second anodic oxidation treatment tank for 10-15 minutes; the liquid medicine in the second anodic oxidation treatment tank comprises sulfuric acid accounting for 10-15% of the total mass concentration of the liquid medicine, boric acid accounting for 1-3% of the total mass concentration of the liquid medicine, diammonium hydrogen phosphate accounting for 0.5-1% of the total mass concentration of the liquid medicine, stabilizing agent accounting for 0.5-1% of the total mass concentration of the liquid medicine and the balance of water; the liquid medicine temperature of the second anodizing treatment tank is controlled at 10-12 ℃ and the anode voltage is controlled at 20-25V, and the phase structure of the formed crystalline state is gamma-Al 2 O 3 Is densely provided with the miniature blind holesAnd deposited on the surface of the alumina dense film layer.
In a further technical scheme, the surface passivation treatment sub-step of the riveting caulking groove comprises the following sub-steps which are sequentially executed,
2.21 Immersing the aluminum substrate in an acid degreasing tank for 3-5 minutes, and removing surface impurities through the acid degreasing treatment, wherein the liquid medicine in the acid degreasing tank comprises sulfuric acid accounting for 5-15% of the total mass concentration of the liquid medicine, OP emulsifier accounting for 3-5% of the total mass concentration of the liquid medicine, TX-10 emulsifier accounting for 3-5% of the total mass concentration of the liquid medicine, sodium citrate accounting for 0.1-0.2% of the total mass concentration of the liquid medicine and the balance of water; the temperature of the liquid medicine in the acid degreasing tank is controlled at 40-50 ℃;
2.22 Washing with water, removing to a clear water tank for washing at least once after the soaking time is reached;
2.23 Immersing the aluminum substrate in an alkaline washing tank for 10-60 seconds, wherein the liquid medicine in the alkaline washing tank comprises 15-20% of sodium hydroxide and the balance of water in the total mass concentration of the liquid medicine, the temperature of the liquid medicine in the alkaline washing tank is controlled at 60-70 ℃, and the surface impurities and the residual acid are further removed through the alkaline washing treatment;
2.24 Washing with water, removing to a clear water tank for washing at least once after the soaking time is reached;
2.25 Immersing the aluminum substrate in a neutralization tank for 30-100 seconds, wherein the liquid medicine in the neutralization tank comprises 8-20% of nitric acid, 3-5% of neutralizing additive and the balance of water; the temperature of the liquid medicine in the neutralization tank is controlled at 20-30 ℃, and residual alkali is removed through neutralization treatment;
2.26 Surface passivation treatment, namely immersing the aluminum substrate into a surface passivation groove for 3-5 minutes; the liquid medicine in the surface passivation tank comprises 10-15% of chromium chloride, 1-3% of potassium formate, 3-5% of sodium citrate, 0.5-1% of glycerol, 1-3% of boric acid, 0.5-1% of sodium dodecyl sulfate and the balance of water;
The pH value of the liquid medicine in the surface passivation tank is controlled to be 3-4; the temperature of the liquid medicine in the surface passivation tank is controlled at 20-30 ℃;
performing surface passivation treatment on at least each riveting groove through the surface passivation groove, and forming an aluminum oxide passivation film layer on at least each surface of each riveting groove of the aluminum substrate;
2.27 Cold water washing, namely, after the soaking time is up, removing the water into a cold water clear water tank for water washing, and at least carrying out cold water washing once;
2.28 Hot water washing, namely, after the cold water washing reaches the soaking time, removing the water to a hot water clear water tank for washing, and at least washing once with hot water;
2.29 Drying the surface water;
2.30 Baking, namely drying the aluminum substrate for 25-35 minutes in a baking oven, controlling the temperature of the baking oven to be 80-90 ℃ to harden the sand surface, and enabling the surface hardness of the aluminum oxide passivation film layer to be greater than that of the complex crystallization film layer;
2.31 Surface passivation treatment is completed.
The utility model provides an improve aluminum radiator of riveting structure, aluminium substrate and a plurality of lamellar heat dissipation aluminum fins, each heat dissipation aluminum fins's lower part is provided with riveting portion, its characterized in that respectively:
the riveting surface of the aluminum base material is provided with a plurality of riveting grooves which are subjected to surface passivation treatment at intervals, and each surface of the riveting grooves is respectively formed with an aluminum oxide passivation film layer;
The surface of the riveting part of each radiating aluminum fin is respectively compounded with a perforated mucous membrane layer with self-adhesive surface;
the perforated mucosa layer comprises a non-porous solid barrier layer attached to the surface of the rivet embedding part and a perforated adhesive layer attached to the surface of the non-porous solid barrier layer and having adhesiveness;
the nonporous solid barrier layer is an alumina compact film layer deposited on the surface of the riveting part in the activating treatment process of the anodic oxidation treatment;
the porous adhesive layer is a complex crystal film layer which is deposited on the surface of the alumina compact film layer in the anodic oxidation treatment process without hole sealing treatment and has hardness smaller than that of the aluminum substrate;
after the riveting processing, each riveting part is respectively fixed in a corresponding riveting groove in a riveting way, the riveting part is in interference fit with the riveting groove, a Kong Nianmo layer is filled between the riveting part and the riveting groove, and the perforated mucous membrane layer of each riveting part is respectively in mutual snap fit with the corresponding alumina passivation membrane layer of each riveting groove.
In a further technical scheme, the lower end parts of the radiating aluminum fins are reversely bent upwards and are overlapped and pressed on the lower parts of the radiating aluminum fins, a U-shaped riveting part is formed at the lower end parts of the radiating aluminum fins, and at least one groove which extends longitudinally for a set length or penetrates longitudinally through the riveting part is formed at the left side and the right side of the riveting part respectively;
The width of the riveting caulking groove is not smaller than the width of the corresponding riveting part before riveting processing;
the surface of the alumina passivation film layer is densely provided with a plurality of micro holes at intervals, each micro hole comprises at least one inwards concave micro cavity and convex parts which are opposite to the micro cavity and are arranged around the micro cavity in a convex mode, and the surface of the riveting slot is in a honeycomb-shaped sand surface shape;
the surface of the perforated adhesive layer is densely provided with a plurality of micro blind holes, the top surfaces of the micro blind holes respectively penetrate through the top surface of the perforated adhesive layer and respectively form an upper opening, and the micro blind holes are symmetrically and periodically arranged in a hexagonal mode in a two-dimensional plane and form a face-centered structure;
after the riveting processing, the wall bodies at the middle upper parts of the left side wall and the right side wall of each riveting groove are respectively embedded into the grooves of the corresponding riveting parts, and each heat-dissipating aluminum fin is respectively erected at the upper parts of the riveting surfaces of the aluminum base materials;
the convex parts of the aluminum oxide passivation film layers of the riveting grooves are respectively inserted into the complex crystal film layers of the corresponding riveting parts after riveting, the complex crystal film layers of the riveting parts are respectively inserted into the corresponding micro holes of the aluminum oxide passivation film layers of the corresponding riveting grooves, and all the joint surfaces of the complex crystal film layers and the corresponding aluminum oxide passivation film layers are in micro occlusion.
In a further technical scheme, the upper opening of the micro blind hole is blocked and closed by the alumina passivation film layer after riveting processing, or the convex part of the alumina passivation film layer is inserted into the upper opening of the micro blind hole to block and close the upper opening of the micro blind hole, and each micro blind hole respectively forms a totally-closed micropore;
the total thickness of the perforated mucosa layer is controlled to be 20-50 microns, the thickness of the complex crystallization film layer is controlled to be 10-30 microns, the average width of the micro blind holes on the formed complex crystallization film layer is controlled to be 1-5 microns, and the average depth is controlled to be 5-20 microns.
Compared with the prior art, the invention has the advantages that:
1. the invention has simple and simple process, strong biting force is formed between the riveting part of the metal fin and the riveting groove of the metal substrate, the riveting is firm, the loosening is not easy, the heat conduction speed of the riveting part between the metal fin and the metal substrate is high, and no thermal node exists.
2. The riveting structure is not easy to loosen, has strong weather resistance and long service life because the adhesive film layer with holes has high adhesion and has extremely strong biting force with each alumina passivation film layer in long-term use in relatively bad use environments with higher temperature or lower temperature and is not influenced by heat expansion and cold contraction.
3. The perforated mucous membrane layer is mutually meshed with each alumina passivation film layer after the riveting part is riveted and fixed in the corresponding riveting groove, and the upper opening of each miniature blind hole is sealed to form a totally-enclosed closed micropore, so that the totally-enclosed micropore has stronger biting force, the riveting firmness is enhanced, each metal fin is not easy to fall off due to accidental impact, and the metal fin is not easy to be pulled out due to the influence of external force.
Drawings
Fig. 1 is a schematic structural view of a heat sink of the present invention.
Fig. 2 is a partial enlarged view at B in fig. 1.
Fig. 3 is a schematic structural view of a groove designed with a circular arc shape in cross section in the clinching portion.
Fig. 4 is a schematic structural view of a one-time completion of a riveting operation by a clinching tab of an automatic clinching apparatus.
Fig. 5 is a schematic structural diagram of the heat sink after the riveting is completed.
Fig. 6 is a schematic structural view of a rivet portion designed with a groove having a square cross-sectional shape.
Fig. 7 is a schematic view of a structure in which the caulking portion is designed with a groove having a barb shape in cross-sectional shape.
Fig. 8 is a schematic structural view of a caulking portion designed with a groove having a triangular cross-sectional shape.
Fig. 9 is a schematic view of a structure of a perforated mucous membrane layer formed on the surface of the caulking portion.
Fig. 10 is an enlarged view of an alumina passivation film layer in a sand face configuration disposed in a caulking groove.
FIG. 11 is a comparison table of temperature difference test data at 0-300 seconds after heating a metal substrate.
FIG. 12 is a comparison table of temperature difference test data at 300-600 seconds after heating a metal substrate.
FIG. 13 is a graph comparing data from a temperature differential test between 0 and 600 seconds after heating a metal substrate.
Fig. 14 is a graph of voltage for forming a perforated adhesive layer.
The marks in the figure: 1. metal base material 11, caulking groove.
2. Metal fin 21, rivet portion 22, slot.
3. Tape Kong Nianmo layer 31, non-porous solid barrier layer 32, porous adhesive layer 33, micro blind holes.
Examples
The following are only preferred embodiments of the present invention, and are not intended to limit the scope of the present invention.
A riveting method of an aluminum radiator comprises a radiating aluminum fin processing step, an aluminum substrate processing step and a riveting processing step,
1, a processing step of a heat dissipation aluminum fin, which comprises the following substeps,
1.1, machining a plurality of thin sheet-shaped radiating aluminum fins 2 by adopting aluminum materials, wherein the lower parts of the radiating aluminum fins 2 are respectively provided with a riveting part 21; specifically, the riveting portion 21 is formed by machining, the lower end portion of the heat dissipation aluminum fin 2 is reversely bent upwards and is overlapped and pressed on the lower portion of the heat dissipation aluminum fin 2, so that a U-shaped riveting portion 21 is formed at the lower end portion of the heat dissipation aluminum fin 2, at least one groove 22 extending longitudinally for a set length or penetrating the riveting portion 21 longitudinally is formed on the left side and the right side of the riveting portion 21, and the riveting portion 21 is in clearance fit with the riveting groove 11 before riveting.
1.2 a surface activation treatment substep, firstly shielding other outer surfaces except the riveting part 21 on the heat dissipation aluminum fin 2, then carrying out surface activity treatment on the heat dissipation aluminum fin 2, or directly carrying out surface activity treatment on the heat dissipation aluminum fin 2, immersing the heat dissipation aluminum fin 2 into a first anodic oxidation treatment tank for surface activation treatment, and attaching a non-porous solid barrier layer 31 on at least the surface of the riveting part 21, wherein the non-porous solid barrier layer 31 is a solid non-porous surface compact alumina film layer deposited on the surface of the riveting part 21 in the anodic oxidation treatment process.
The surface activation treatment sub-step specifically includes the following sub-steps performed in sequence,
1.21 acid degreasing treatment, immersing the heat-radiating aluminum fins 2 in an acid degreasing tank for 3-5 minutes, and removing surface impurities through acid degreasing treatment, wherein liquid medicine in the acid degreasing tank comprises sulfuric acid accounting for 5-15% of the total mass concentration of the liquid medicine, OP emulsifier accounting for 3-5% of the total mass concentration of the liquid medicine, sodium citrate accounting for 0.1-0.2% of the total mass concentration of the liquid medicine and the balance of water; the temperature of the liquid medicine in the acid degreasing tank is controlled at 40-50 ℃;
1.22, washing with water, and removing to a clear water tank for washing at least once after the soaking time is reached;
1.23 alkali washing treatment, namely immersing the heat-radiating aluminum fins 2 in an alkali washing tank for 10-60 seconds, wherein the liquid medicine in the alkali washing tank comprises sodium hydroxide accounting for 15-20% of the total mass concentration of the liquid medicine and the balance of water, the temperature of the liquid medicine in the alkali washing tank is controlled at 60-70 ℃, and the surface impurities are further removed and the residual acid is removed through the alkali washing treatment;
1.24 washing, namely removing the water after the soaking time is up to the clear water tank for washing, and washing at least once;
1.25 neutralizing treatment, namely immersing the heat-radiating aluminum fins 2 in a neutralizing tank for 30-100 seconds, wherein the liquid medicine in the neutralizing tank comprises 8-20% of nitric acid, 3-5% of neutralizing additive and the balance of water, wherein the total mass concentration of the liquid medicine is 8-20%; the temperature of the liquid medicine in the neutralization tank is controlled at 20-30 ℃, and residual alkali is removed through neutralization treatment;
1.26 activating treatment, namely immersing the radiating aluminum fins 2 into a first anodic oxidation treatment tank for 3-5 minutes; the liquid medicine in the first anodic oxidation treatment tank comprises sulfuric acid accounting for 18-20% of the total mass concentration of the liquid medicine, nickel sulfate accounting for 0.8-2% of the total mass concentration of the liquid medicine and the balance of water; the temperature of the liquid medicine in the first anodizing treatment tank is controlled at 23-25 ℃, and the anode voltage is controlled at 13-15V; depositing a solid non-porous aluminum oxide compact film layer with compact surface on the surface of the riveting part 21 through an anodic oxidation process, and controlling the density of the formed aluminum oxide compact film layer through nickel sulfate;
1.27, washing with water, and removing to a clear water tank for washing at least once after the soaking time is reached;
1.28 finishing the surface activation treatment.
1.3 substep of forming a perforated mucosal layer 3, wherein the radiating aluminum fins 2 taken out from the first anodizing bath are directly immersed into the second anodizing bath for anodizing after being washed at least once, and a perforated mucilage layer 32 with self-adhesive and densely distributed with a plurality of micro blind holes 33 is directly deposited on the surface of the non-porous solid barrier layer 31, a perforated mucosal layer 3 with self-adhesive and densely distributed with a plurality of micro blind holes 33 is formed on the surface of the rivet embedding part 21 at least, and the surface of each micro blind hole 33 penetrates through the top surface of the perforated mucilage layer 32, wherein the phase structure of the crystalline phase structure formed in the anodizing process of the perforated Kong Nianzhi layer 32 is gamma-Al 2 O 3 The complex crystal film layer is connected with and integrated with the alumina compact film layer.
The sub-step of forming the perforated mucosal layer 3 specifically includes the following sub-steps performed in sequence,
1.31 forming a porous adhesive layer, immersing the heat-radiating aluminum fins 2 subjected to the activation treatment into a second anodic oxidation treatment tank for 10-15 minutes; medicine in second anodic oxidation treatment tank The liquid comprises sulfuric acid accounting for 10-15% of the total mass concentration of the liquid medicine, boric acid accounting for 1-3% of the total mass concentration of the liquid medicine, diammonium hydrogen phosphate accounting for 0.5-1% of the total mass concentration of the liquid medicine, stabilizing agent accounting for 0.5-1% of the total mass concentration of the liquid medicine and the balance water; the liquid medicine temperature of the second anodizing treatment tank is controlled at 10-12 ℃ and the anode voltage is controlled at 20-25V, and the phase structure of the formed crystalline state is gamma-Al 2 O 3 Is densely covered with a complex crystal film layer of micro blind holes 33 and is deposited on the surface of the alumina dense film layer.
In a preferred embodiment, the thickness of the formed porous adhesive layer 32 is controlled to be 100 micrometers or less, the thickness of the porous adhesive layer 32 is controlled to be 50 micrometers or less, and each micro blind hole 33 is formed simultaneously in the forming process of the porous adhesive layer 32, and each micro blind hole 33 is arranged in a hexagonal symmetrical cycle in a two-dimensional plane and forms a face-centered structure.
In a preferred embodiment, the total thickness of the layer 32 of tape Kong Nianzhi is controlled to be 20-50 microns, the thickness of the layer 32 of tape Kong Nianzhi is controlled to be 10-30 microns, the average width of the blind micro holes 33 is controlled to be 1-5 microns, and the average depth is controlled to be 5-20 microns.
Wherein the tape Kong Nianzhi layer 32 is a complex crystalline film layer formed and deposited on the surface of the alumina dense film layer in an anodic oxidation treatment process in which the pore sealing treatment process step is omitted, and the hardness of the tape Kong Nianzhi layer 32 is less than that of the aluminum substrate 1.
1.4 baking step, cleaning the heat dissipation aluminum fins 2 which are subjected to anodic oxidation treatment in the substep of forming the perforated mucosa layer 3, then baking the heat dissipation aluminum fins 2 in a baking oven for 20-30 minutes, controlling the temperature of the baking oven to be 80-90 ℃, based on the good heat conduction performance of the heat dissipation aluminum fins 2, forming a circular outer rolled edge on the upper hole edge of each micro blind hole 33 in an S shape and expanding the upper hole edge of each micro blind hole 33 relatively to heat in an S shape because the heat conduction coefficient of the heat dissipation aluminum fins 2 is larger than that of the Kong Nianzhi layer 32 and the inner part of each micro blind hole 33 is poor relative to the heat dissipation aluminum fins 2, and forming a first rolled edge on the upper hole edge of each micro blind hole 33 in the early stage of the baking process along with the increase of accumulated heat in the holes of the micro blind holes 33, and reversely rolling the first rolled edge of each micro blind hole 33 towards the outer side after the temperature of the heat dissipation aluminum fins 2 is higher than the temperature of the heat dissipation aluminum fins 33.
The surface of the alumina passivation film layer is densely provided with a plurality of micro holes at intervals, and each micro hole comprises at least one inwards concave micro cavity and convex parts which are opposite to the micro cavity and are arranged around the micro cavity.
2 an aluminum substrate processing step comprising the following substeps,
2.1, an aluminum substrate machining substep, namely, processing an aluminum substrate 1 by using an aluminum material, wherein a plurality of riveting caulking grooves 11 which are arranged at intervals are formed in a riveting surface of the aluminum substrate 1, and the width of each riveting groove is not smaller than that of a riveting part; specifically, two elongated slots which are arranged at intervals are respectively formed on the left side and the right side of each riveting and embedding slot 11 of the riveting and pressing surface of the aluminum base material 1 through a machining or stamping process, and the elongated slots are arranged in parallel with the grooves 22;
2.2 surface passivation treatment sub-step of riveting the caulking groove, firstly shielding other outer surfaces except for the caulking groove 11 on the aluminum base material 1, then immersing the aluminum base material 1 into the surface passivation groove for surface passivation treatment, or directly carrying out surface passivation treatment on the aluminum base material 1, forming an aluminum oxide passivation film layer on each surface of each caulking groove 11 of the aluminum base material 1, wherein the aluminum oxide passivation film layer is Al deposited on each surface of the caulking groove formed in the surface passivation treatment process 2 O 3 And depositing layers to enable each surface of the caulking groove 11 to be in a honeycomb-shaped sand surface shape.
The surface passivation treatment sub-step of the caulking groove specifically comprises the following sub-steps sequentially executed,
2.21 acid degreasing treatment, immersing the aluminum substrate 1 in an acid degreasing tank for 3-5 minutes, and removing surface impurities through acid degreasing treatment, wherein the liquid medicine in the acid degreasing tank comprises sulfuric acid accounting for 5-15% of the total mass concentration of the liquid medicine, OP emulsifier accounting for 3-5% of the total mass concentration of the liquid medicine, TX-10 emulsifier accounting for 3-5% of the total mass concentration of the liquid medicine, sodium citrate accounting for 0.1-0.2% of the total mass concentration of the liquid medicine and the balance of water; the temperature of the liquid medicine in the acid degreasing tank is controlled at 40-50 ℃;
2.22, washing with water, and removing to a clear water tank for washing at least once after the soaking time is reached;
2.23 alkali washing treatment, namely immersing the aluminum substrate 1 in an alkali washing tank for 10-60 seconds, wherein the liquid medicine in the alkali washing tank comprises sodium hydroxide accounting for 15-20% of the total mass concentration of the liquid medicine and the balance of water, the temperature of the liquid medicine in the alkali washing tank is controlled at 60-70 ℃, and the surface impurities and the residual acid are further removed through the alkali washing treatment;
2.24, washing with water, and removing to a clear water tank for washing at least once after the soaking time is reached;
2.25 neutralization treatment, namely immersing the aluminum substrate 1 in a neutralization tank for 30-100 seconds, wherein the liquid medicine in the neutralization tank comprises 8-20% of nitric acid, 3-5% of neutralization additive and the balance of water, wherein the concentration of the nitric acid is 8-20% of the total mass of the liquid medicine; the temperature of the liquid medicine in the neutralization tank is controlled at 20-30 ℃, and residual alkali is removed through neutralization treatment;
2.26 surface passivation treatment, immersing the aluminum substrate 1 in a surface passivation tank for 3-5 minutes; the liquid medicine in the surface passivation tank comprises 10-15% of chromium chloride, 1-3% of potassium formate, 3-5% of sodium citrate, 0.5-1% of glycerol, 1-3% of boric acid, 0.5-1% of sodium dodecyl sulfate and the balance of water;
The pH value of the liquid medicine in the surface passivation tank is controlled to be 3-4; the temperature of the liquid medicine in the surface passivation tank is controlled at 20-30 ℃;
performing surface passivation treatment on at least each riveting groove 11 through a surface passivation groove, and forming an aluminum oxide passivation film layer on at least each surface of each riveting groove 11 of the aluminum substrate 1;
2.27, cold water washing, namely removing the water after the soaking time is up to the cold water clear water tank for water washing, and at least carrying out cold water washing once;
2.28 hot water washing, namely after the cold water washing reaches the soaking time, removing the water to a hot water clear water tank for washing, and at least washing once with hot water;
2.29, drying the surface moisture;
2.30 baking, namely drying the aluminum substrate 1, and then placing the aluminum substrate in a baking oven to bake for 25-35 minutes, wherein the temperature of the baking oven is controlled to be 80-90 ℃ to harden the sand surface, so that the surface hardness of the aluminum oxide passivation film layer is higher than that of the complex compound crystallization film layer;
2.31 finishing the surface passivation treatment.
And 3, a riveting processing step, namely cleaning the plurality of radiating aluminum fins 2 subjected to anodic oxidation treatment in the substep of forming the perforated mucosal layer 3, then directly positioning and clamping the radiating aluminum fins 2 in automatic riveting equipment or a riveting jig, directly positioning and clamping the riveting caulking groove 11 subjected to surface passivation treatment in the automatic riveting equipment or the riveting jig, firstly inserting the riveting part 21 of each radiating aluminum fin 2 into the corresponding riveting groove 11 through the automatic riveting equipment at one time, riveting the aluminum base material 1 through a riveting head of the automatic riveting equipment, and riveting and fixing the plurality of radiating aluminum fins 2 on the same aluminum base material 1 through one riveting action, thereby obtaining the aluminum radiator with the radiating aluminum fins 2 which are fixed on the aluminum base material 1 at intervals, wherein the riveting part 21 is in interference fit with the caulking groove 11 after the riveting processing, the gap between the riveting part 21 and the riveting groove 11 is filled with the perforated mucosal layer 3 of the riveting part 21 after the riveting deformation, and the aluminum base material 1 is in mutual fit with the oxide film layer of the riveting groove 11 of the riveting part 21.
In a preferred embodiment, the thickness of the formed alumina passivation film layer is controlled below 20 micrometers, and a plurality of micro holes are densely arranged on the surface of the alumina passivation film layer at intervals, wherein each micro hole comprises at least one micro concave cavity which is concave inwards and a convex part which is convex relative to the micro concave cavity and is arranged around the micro concave cavity.
In an alternative embodiment, in the riveting process, each corresponding riveting head is respectively positioned and pre-pressed in a corresponding slender groove, then downwards riveting is performed, the deformation positions and deformation amounts of the aluminum base material 1 and the side walls of the riveting groove 11 are controlled through the slender groove, and the wall bodies at the middle upper parts of the left side wall and the right side wall of the riveting groove 11 are respectively embedded into corresponding grooves 22;
preferably, the depth of the riveting slot 11 is controlled to be smaller than the height of the riveting slot 21, after the bottoms of the riveting slots 21 are respectively inserted into the corresponding riveting slots 11 before riveting, the upper ends of the riveting slots 21 extend out above the riveting surface, after the riveting process, the side walls of the riveting slots 11 are respectively tightly wrapped on the corresponding connected surfaces of the riveting slots 21, and after the riveting slots 21 are fixed in the riveting slots 11 in a riveting manner, the heat dissipation aluminum fins 2 are respectively erected on the upper parts of the riveting surfaces of the aluminum substrates 1.
Convex parts of the aluminum oxide passivation film layer are respectively inserted into the complex crystal film layer after riveting processing, the complex crystal film layer is respectively inserted into micro holes of the aluminum oxide passivation film layer, and all the interfaces of the complex crystal film layer and the aluminum oxide passivation film layer are in micro occlusion;
The upper opening of the micro blind hole 33 is blocked and closed by the alumina passivation film layer after riveting, or the convex part of the alumina passivation film layer is inserted into the upper opening of the micro blind hole 33 to block and close the upper opening of the micro blind hole 33, so that each micro blind hole 33 respectively forms a totally-enclosed closed micropore;
after the riveting processing, each outer rolled hemming is pressed and deformed and respectively flattened on the upper hole edge of the corresponding miniature blind hole 33, the S-shaped outer rolled hemming is flattened into a Z shape and is tightly overlapped on the upper hole edge of the corresponding miniature blind hole 33, so as to form a closed hole ring protruding out of the upper hole edge of the miniature blind hole 33.
According to the aluminum radiator with the improved riveting structure produced by the production process, an aluminum substrate 1 and a plurality of flaky radiating aluminum fins 2 are respectively provided with a riveting part 21, riveting surfaces of the aluminum substrate 1 are provided with a plurality of riveting grooves 11 which are arranged at intervals and are subjected to surface passivation treatment, and each surface of each riveting groove 11 is respectively provided with an aluminum oxide passivation film layer; the surface of the riveting part 21 of each radiating aluminum fin 2 is subjected to anodic oxidation treatment and then is respectively compounded with a perforated mucosa layer 3 with self-adhesive surface; the perforated mucosa layer 3 includes a non-porous solid barrier layer 31 attached to the surface of the rivet portion 21, and a perforated adhesive layer 32 having tackiness attached to the surface of the non-porous solid barrier layer 31; the nonporous solid barrier 31 is an alumina dense film layer deposited on the surface of the rivet portion 21 during the activation process of the anodic oxidation process; the tape Kong Nianzhi layer 32 is a complex crystalline film layer having a hardness smaller than that of the aluminum substrate 1 deposited on the surface of the alumina dense film layer during the anodizing treatment without using a sealing treatment; the width of the caulking groove 11 is not smaller than the width of the corresponding caulking portion 21 before the caulking process; after the riveting processing, each riveting part 21 is respectively fixed in the corresponding riveting groove 11 in a riveting mode, the riveting parts 21 are in interference fit with the riveting grooves 11, the perforated mucous membrane layer 3 is filled between the riveting parts 21 and the riveting grooves 11, and the perforated mucous membrane layer 3 of each riveting part 21 is respectively in mutual snap fit with the corresponding alumina passivation membrane layer of each riveting groove 11. The upper opening of the micro blind hole 33 is blocked and closed by an alumina passivation film layer after riveting, or the convex part of the alumina passivation film layer is inserted into the upper opening of the micro blind hole 33 to block and close the upper opening of the micro blind hole 33, and each micro blind hole 33 respectively forms a totally-enclosed closed micropore.
Specifically, the lower end of the heat dissipation aluminum fin 2 is reversely bent upwards and is overlapped and fixed on the lower part of the heat dissipation aluminum fin 2, a U-shaped riveting and embedding part 21 is formed at the lower end of the heat dissipation aluminum fin 2, the width of the riveting and embedding part 11 is not smaller than that of the riveting and embedding part 21, the riveting and embedding part 21 is in clearance fit with the riveting and embedding part 11 before riveting and embedding part 21 is in interference fit with the riveting and embedding part 11 after riveting and pressing. The upper end of the caulking portion 21 protrudes above the caulking face after the caulking portion 21 is caulked and fixed to the caulking groove 11. After the riveting part 21 is fixed in the riveting groove 11 in a riveting mode, each heat radiation aluminum fin 2 is respectively erected on the upper portion of the riveting surface.
In a specific embodiment, all the heat dissipation aluminum fins 2 of at least one aluminum radiator are clamped at one time by a jig, then the riveting parts 21 of all the heat dissipation aluminum fins 2 are inserted into the corresponding riveting grooves 11 at one time by a mechanical arm or an inserting device, then the aluminum base material 1 is automatically riveted by the riveting parts of automatic riveting equipment, so that the wall bodies on two sides of the riveting grooves 11 are deformed and are in hard extrusion fit with the riveting parts 21, and as shown in fig. 3-5, after the riveting parts 21 are fixed in the riveting grooves 11 in a riveting mode, the wall bodies on the middle upper parts of the left side wall and the right side wall of the riveting grooves 11 are respectively embedded into the corresponding grooves 22.
The riveting surface of the aluminum base material 1 is provided with two elongated grooves which are arranged at intervals on the left side and the right side of each riveting caulking groove 11 respectively, the elongated grooves are arranged in parallel with the grooves 22, guiding and positioning functions are provided for the riveting heads of automatic riveting equipment, the deformation position and deformation amount of the aluminum base material 1 are controlled more accurately while lateral movement is avoided in the riveting process, the riveting is more accurate, each area of the riveting grooves 11 is coated and extruded with the riveting part 21 more uniformly in the hard extrusion riveting process, the contact area between the riveting part 21 and the riveting grooves 11 is increased to more than 98%, the grooves 22 of the riveting part 21 can be filled with the side walls of the riveting grooves 11 after deformation, and the riveting is more firm.
Specifically, at least one groove 22 longitudinally penetrating the rivet portion 21 is formed on the left and right sides of the rivet portion 21, or the groove 22 is only longitudinally extended for a set length. As shown in fig. 3 to 8, the shape of the longitudinal section of the groove 22 includes a square, a semicircle or a triangle to form differently shaped fastening parts, respectively, so that each heat radiating aluminum fin 2 is firmly fixed to the corresponding caulking groove 11, respectively.
In a preferred embodiment, a perforated adhesive film layer 3 with an adhesive surface is adhered to the surface of the riveting portion 21, a plurality of micropores are densely distributed on the surface of the perforated adhesive film layer 3, the riveting portion 21 of each heat dissipation aluminum fin 2 is fixed in the corresponding riveting groove 11 through a riveting process, and the perforated adhesive film layer 3 is filled between the riveting portion 21 and the riveting groove 11. After the riveting part 21 is riveted and fixed in the riveting groove 11, the perforated mucous membrane layer 3 is mutually meshed and matched with each corresponding aluminum oxide passivation film layer, so that the riveting part has stronger biting force, the riveting firmness is enhanced, each heat-dissipating aluminum fin 2 is not easy to fall off due to accidental impact, and the heat-dissipating aluminum fin 2 is not easy to be pulled out due to the influence of external force.
The aluminum substrate riveting and embedding structure has the advantages that the structure is simple, strong biting force is formed between the riveting and embedding part 21 of the heat-radiating aluminum fins 2 and the riveting and embedding groove 11 of the aluminum substrate 1, riveting is firm, looseness is not easy to occur, heat conduction speed between the heat-radiating aluminum fins 2 and the aluminum substrate 1 is high, the heat-radiating aluminum substrate riveting and embedding structure is long-term used in relatively bad use environments with higher temperature or lower temperature, and the like, and because the perforated mucosa layer 3 has viscosity and extremely strong biting force is formed between the perforated mucosa layer and each corresponding aluminum oxide passivation film layer, the heat expansion and contraction influence is avoided, looseness is not easy to occur, the weather resistance is strong, and the service life is long.
The aluminum base material 1 is fixed on a tensile force detection device, one of the radiating aluminum fins 2 is pulled upwards, a pulling test is carried out, and the single-sheet pulling force reaches more than 150Kg after detection.
In a preferred embodiment, the aluminum substrate 1 is an aluminum substrate, the heat dissipating aluminum fins 2 are thin aluminum substrates, the perforated adhesive film layer 3 comprises a non-porous solid barrier layer 31 attached to the surface of the rivet portion 21 and a perforated adhesive layer 32 attached to the surface of the non-porous solid barrier layer 31, the surface of the layer 32 of the band Kong Nianzhi is adhesive, each micropore is a micro blind hole 33 formed in the middle upper part of the perforated adhesive layer 32, respectively, the top surface of each micro blind hole 33 penetrates through the top surface of the perforated adhesive layer 32, respectively, the layer 32 of the band Kong Nianzhi is a crystalline structure, and each micro blind hole 33 is arranged in a hexagonal symmetrical cycle in a two-dimensional plane and forms a face-centered structure.
Specifically, on the other outer surfaces of the aluminum substrate 1 except the riveting caulking groove 11, the surface passivation treatment is performed on each riveting groove 11 of the aluminum substrate 1, so that each surface of the riveting groove 11 is respectively provided with an alumina passivation film layer, the surfaces of the alumina passivation film layers are densely arranged with a plurality of micro holes at intervals, each micro hole comprises at least one inwards concave micro concave cavity and a convex part which is protruded and arranged around the micro concave cavity relative to the micro concave cavity, the surface of the riveting groove 11 is in a sand surface shape of a honeycomb shape, and after the riveting part 21 is riveted and fixed in the riveting groove 11, the perforated mucosa layer 3 is mutually meshed with each corresponding alumina passivation film layer. An enlarged view of the alumina passivation film layer in the form of a sand face in the caulking groove 11 is indicated at a in fig. 10.
Specifically, the non-porous solid barrier layer 31 is an alumina dense film layer deposited on the surface of the rivet-embedded part 21 during the activation treatment of the anodic oxidation treatment, the liquid medicine in the first anodic oxidation treatment tank comprises sulfuric acid accounting for 18-20% of the total mass concentration of the liquid medicine, nickel sulfate accounting for 0.8-2% of the total mass concentration of the liquid medicine and the rest water, the liquid medicine temperature of the first anodic oxidation treatment tank is controlled at 23-25 ℃, the anode voltage is controlled at 13-15V, the nickel sulfate is used for controlling the density of the formed alumina dense film layer, the rivet-embedded part 21 with clean surface is soaked in the first anodic oxidation treatment tank for 3-5 minutes, and the alumina dense film layer with the thickness of 5-20 microns is taken out and washed clean, so that the alumina dense film layer is formed by anodic oxidation, and therefore, the alumina dense film layer and the rivet-embedded part 21 have extremely strong combining force.
Specifically, the tape Kong Nianzhi layer 32 is a crystalline film of a complex deposited on the surface of an alumina dense film layer during an anodic oxidation treatment without using a pore sealing treatment. The liquid medicine in the second anodic oxidation treatment tank comprises sulfuric acid accounting for 10-15% of the total mass concentration of the liquid medicine, boric acid accounting for 1-3% of the total mass concentration of the liquid medicine, diammonium hydrogen phosphate accounting for 0.5-1% of the total mass concentration of the liquid medicine, stabilizing agent accounting for 0.5-1% of the total mass concentration of the liquid medicine and the balance of water. The liquid medicine temperature of the second anodizing treatment tank is controlled at 10-12 ℃ and the anode voltage is controlled at 20-25V. After the first anodic oxidation treatment tank of the riveting part 21 is soaked for enough time, the riveting part 21 is removed from the first anodic oxidation treatment tank, is washed clean by water, and is directly soaked in the second anodic oxidation treatment tank for 10-15 minutes, the anodic oxidation treatment tank provides bond energy through high anodic voltage of 20-25V, and a crystalline phase structure of gamma-Al is formed 2 O 3 The complex crystal film layer is deposited on the surface of the alumina compact film layer, the thickness of the complex crystal film layer deposited on the surface of the alumina compact film layer is controlled to be 10-30 microns in the treatment time of 10-15 minutes, so that the riveting part 21 is in full-area contact with all the contact surfaces of the riveting groove 11, the surface contact of the complex crystal film layer and the alumina passivation film layer provides strong adhesive force for the complex crystal film layer, the problem that the gap error exists between the riveting part 21 and the local part of the riveting groove 11 in the prior art can be solved, and the problem that the contact force is small because the local part is not deformed in place after the riveting processing in the prior art can be solved.
The anodic oxidation treatment process has a hole sealing treatment step, the hole sealing treatment step seals the upper part of the micro blind holes 33, and the anodic oxidation treatment process of the invention omits the hole sealing treatment step, and only uses the anodic gasification treatment step and the necessary cleaning step to form the complex crystal film layer with self-adhesive surface, and the complex crystal film layer is densely and periodically arranged with the micro blind holes 33 with upper openings.
The average width of the micro blind holes 33 formed on the complex crystal film layer is controlled to be 1-5 microns, the average depth is controlled to be 5-20 microns, and the surface of the formed complex crystal film layer has extremely strong adhesiveness, similar to a mucous membrane, after riveting and fixing, air between the complex crystal film layer and the alumina passivation film layer is removed, the complex crystal film layer is closely contacted with the alumina passivation film layer, and extremely strong vacuum suction force, adhesion force and friction force are provided between the complex crystal film layer and the alumina passivation film layer.
Meanwhile, the hardness of the complex crystal film layer is smaller than that of the aluminum substrate 1, along with the generation of deformation in the riveting process, the complex crystal film layer and all the contact areas of the aluminum oxide passivation film layer are guaranteed to be in full contact with each other so as to generate higher cohesive force, after the riveting and hard extrusion, the micro blind holes 33 with larger depth provide deformation space for the complex crystal film layer, the surfaces of the complex crystal film layer are deformed and respectively embedded into micro holes of the aluminum oxide passivation film layer, protruding parts of the aluminum oxide passivation film layer are respectively inserted into the complex crystal film layer, all the contact surfaces of the complex crystal film layer and the aluminum oxide passivation film layer are in micro occlusion, and meanwhile, the top surfaces of the micro blind holes 33 on the complex crystal film layer are sealed by the aluminum oxide passivation film layer, so that the micro blind holes 33 on the complex crystal film layer form fully-sealed closed micropores, the resultant force between the embedded parts 21 and the caulking grooves 11 can be greatly improved, and the riveting are firmer.
Preferably, the thickness of the perforated mucosal layer 3 is controlled to be 50-100 microns, which increases the cost and requires double the anodic oxidation treatment time, but the perforated mucosal layer 3 with a larger thickness provides the invention with better riveting effect and stronger riveting force. After the thickness of the perforated mucosa layer 3 is increased to 50-100 micrometers, drawing test is carried out, and the drawing force of a single sheet is detected to be more than 200-250 Kg.
Preferably, the total thickness of the perforated mucosa layer 3 is controlled to be 20-50 microns, so that the perforated mucosa layer has better cost balance and time balance, the comprehensive treatment cost is relatively lower, and the riveting firmness is higher.
As the heat sink, the heat conduction capability is the most important parameter, and as the micro-occlusion exists at all the interfaces of the complex crystal film layer and the aluminum oxide passivation film layer, namely the riveting part 21 and the riveting groove 11 are in full-area contact, the heat of the aluminum substrate 1 can be conducted to the heat dissipation aluminum fins 2 more quickly through the riveting part 21, no thermal node exists, and a better heat dissipation effect is achieved. The test data of the heat dissipation effect are shown in fig. 11-13, the bottom of the metal substrate is heated in the test process, and the temperatures of the aluminum substrate 1 and the heat dissipation aluminum fins 2 are detected respectively, so that the temperature difference between the aluminum substrate 1 and the heat dissipation aluminum fins 2 is obtained, and the smaller the temperature difference is, the better the heat conduction performance between the aluminum substrate 1 and the heat dissipation aluminum fins 2 is.
The foregoing is merely exemplary of the present invention, and those skilled in the art should not be considered as limiting the invention, since modifications may be made in the specific embodiments and application scope of the invention in light of the teachings of the present invention.
Claims (11)
1. The riveting method of the aluminum radiator comprises a radiating aluminum fin processing step, an aluminum substrate processing step and a riveting processing step, and is characterized in that,
1) A processing step of the heat dissipation aluminum fin comprises the following substeps,
1.1 Machining the radiating aluminum fins, namely machining the radiating aluminum fins by using aluminum materials to obtain a plurality of thin flaky radiating aluminum fins (2), wherein riveting parts (21) are respectively arranged at the lower parts of the radiating aluminum fins (2);
1.2 The surface activation treatment substep, shielding other outer surfaces except the riveting part (21) on the radiating aluminum fins (2), then carrying out surface activity treatment on the radiating aluminum fins (2), or directly carrying out surface activity treatment on the radiating aluminum fins (2), immersing the radiating aluminum fins (2) into a first anodic oxidation treatment tank for surface activation treatment, and attaching a non-porous solid barrier layer (31) on at least the surface of the riveting part (21), wherein the non-porous solid barrier layer (31) is a solid non-porous surface compact alumina film layer deposited on the surface of the riveting part (21) formed in the anodic oxidation treatment process;
1.3 A step of forming a layer Kong Nianmo of the tape (3), in which the heat-dissipating aluminum fins (2) taken out from the first anodizing bath are directly immersed in the second anodizing bath after being washed at least once to be anodized, and a porous adhesive layer (32) having self-adhesive properties and densely distributed with a plurality of micro blind holes (33) is directly deposited on the surface of the non-porous solid barrier layer (31), a porous adhesive layer (3) having self-adhesive properties and densely distributed with a plurality of micro blind holes (33) on the surface of the tape Kong Nianzhi layer (32) is formed on each surface of the rivet embedding portion (21), and the top surfaces of the micro blind holes (33) are respectively penetrated through the top surfaces of the porous adhesive layer (32), wherein the crystalline phase structure of the tape Kong Nianzhi layer (32) formed during the anodizing process is gamma-Al 2 O 3 The complex crystal film layer is connected with the alumina compact film layer into a whole;
2) An aluminum substrate processing step comprising the substeps of,
2.1 An aluminum substrate machining substep, namely, an aluminum substrate (1) is obtained by machining an aluminum material, a plurality of riveting caulking grooves (11) which are arranged at intervals are formed in the riveting surface of the aluminum substrate (1), and the width of each riveting groove is not smaller than that of each riveting part;
2.2 Firstly shielding other outer surfaces except the riveting caulking groove (11) on the aluminum substrate (1), immersing the aluminum substrate (1) into the surface passivation groove for surface passivation treatment, or directly carrying out surface passivation treatment on the aluminum substrate (1), and forming an aluminum oxide passivation film layer on each surface of each riveting groove (11) of the aluminum substrate (1) at least to enable each surface of each riveting groove (11) to be in a honeycomb sand surface shape;
3) And a riveting processing step, namely, cleaning the plurality of radiating aluminum fins (2) subjected to anodic oxidation treatment in the forming substep of the perforated mucosal layer (3), then directly positioning and clamping the radiating aluminum fins (2) in an automatic riveting device or a riveting jig, directly positioning and clamping the riveting caulking grooves (11) subjected to surface passivation treatment in the automatic riveting device or the riveting jig, firstly, inserting the riveting part (21) of each radiating aluminum fin (2) into the corresponding riveting groove (11) through the automatic riveting device at one time, riveting the aluminum substrate (1) through the riveting head of the automatic riveting device, and riveting and fixing the plurality of radiating aluminum fins (2) on the same aluminum substrate (1) through one riveting action, thereby obtaining the aluminum radiator in which the plurality of radiating aluminum fins (2) arranged at intervals are riveted and fixed on the aluminum substrate (1), wherein the riveting part (21) is in interference fit with the caulking grooves (11), and the riveting part (21) is filled with the perforated mucosal layer (3) of each radiating aluminum fin (21) after the riveting deformation, and the riveting part (21) is in interference fit with the corresponding riveting groove (11), and the riveting part (21) is in the clearance fit with the riveting part (11).
2. The method for riveting an aluminum radiator according to claim 1, wherein:
in the machining substep of the heat-dissipating aluminum fin, the riveting part (21) is formed through machining, the lower end part of the heat-dissipating aluminum fin (2) is reversely bent upwards and overlapped and pressed on the lower part of the heat-dissipating aluminum fin (2), so that a U-shaped riveting part (21) is formed at the lower end part of the heat-dissipating aluminum fin (2), at least one groove (22) which extends longitudinally for a set length or longitudinally penetrates through the riveting part (21) is formed at the left side and the right side of the riveting part (21), and the riveting part (21) is in clearance fit with the riveting groove (11) before riveting;
in the aluminum substrate machining substep, two elongated grooves which are arranged at intervals are respectively formed on the left side and the right side of each riveting groove (11) of the riveting surface of the aluminum substrate (1) through machining or stamping technology, and the elongated grooves are arranged in parallel with the grooves (22);
in the riveting processing step, the corresponding riveting heads are respectively positioned and pre-pressed in the corresponding slender grooves in the riveting process, then downwards riveting is carried out, the deformation positions and deformation amounts of the side walls of the aluminum base material (1) and the riveting groove (11) are controlled through the slender grooves, and the wall bodies at the middle upper parts of the left side wall and the right side wall of the riveting groove (11) are respectively embedded into the corresponding grooves (22);
The depth of the riveting groove (11) is controlled to be smaller than the height of the riveting part (21), the bottom of each riveting part (21) is inserted into the corresponding riveting groove (11) before riveting, the upper end of each riveting part (21) extends out of the riveting surface, each side wall of each riveting groove (11) tightly wraps the corresponding connected surface of each riveting part (21) after riveting, and each heat-dissipating aluminum fin (2) is respectively erected on the upper part of the riveting surface of the aluminum substrate (1) after the riveting part (21) is fixed in the riveting groove (11) in a riveting mode.
3. The method for riveting an aluminum radiator according to claim 1, wherein:
in the surface passivation treatment substep of the riveting groove, the aluminum oxide passivation film layer is AL deposited on each surface of the riveting groove, which is formed in the surface passivation treatment process 2 O 3 Depositing a layer;
in the substep of forming the layer (3) of the tape Kong Nianmo, the thickness of the layer (3) of the formed tape Kong Nianmo is controlled below 100 micrometers, the thickness of the layer (32) of the porous adhesive is controlled below 50 micrometers, each micro blind hole (33) is formed simultaneously in the process of forming the layer (32) of the porous adhesive, and each micro blind hole (33) is arranged in a hexagonal symmetrical cycle in a two-dimensional plane and forms a face-centered structure.
4. The method for riveting an aluminum radiator according to claim 1, wherein:
In the step of forming the layer (3) of the band Kong Nianmo, the layer (32) of the band Kong Nianzhi is the complex crystalline film layer formed in the anodizing process in which the hole sealing process step is canceled and deposited on the surface of the dense film layer of alumina, and the hardness of the layer (32) of the band Kong Nianzhi is smaller than that of the aluminum substrate (1); layer Kong Nianzhi belt (32)
The total thickness of the layer (32) of the tape Kong Nianzhi is controlled to be 20-50 micrometers, the thickness of the layer (32) of the tape is controlled to be 10-30 micrometers, the average width of the micro blind holes (33) is controlled to be 1-5 micrometers, and the average depth is controlled to be 5-20 micrometers;
in the surface passivation treatment sub-step of the riveting groove, the thickness of the formed aluminum oxide passivation film layer is controlled below 20 microns, a plurality of micro holes are densely arranged on the surface of the aluminum oxide passivation film layer at intervals, and each micro hole comprises at least one inwards concave micro cavity and a convex part which is protruded relative to the micro cavity and arranged around the micro cavity.
5. The method for riveting an aluminum radiator according to claim 1, wherein:
a baking step is added after the tape Kong Nianmo layer (3) forming sub-step,
1.4 A baking step of placing the plurality of heat dissipation aluminum fins (2) subjected to anodic oxidation treatment in the forming sub-step of the perforated mucosa layer (3) into a baking oven for baking for 20-30 minutes, wherein the baking oven temperature is controlled to 80-90 ℃, and the heat conduction performance is good based on the heat dissipation aluminum fins (2), because the heat conduction coefficient of the heat dissipation aluminum fins (2) is larger than that of the layer (32) with Kong Nianzhi, and the inner part of each micro blind hole (33) is poor in heat conduction relative to the heat dissipation aluminum fins (2), the upper hole edge of each micro blind hole (33) is firstly extended upwards and simultaneously extended towards the central part of each micro blind hole (33) to form a first curled edge in the early stage of the baking process, and the accumulated heat in the holes of each micro blind hole (33) is increased along with the increase of the heat accumulation in the holes of the micro blind holes (33), the first curled edge of the upper hole edge of each micro blind hole (33) is heated and then reversely curled outwards, and the upper hole of each micro blind hole (33) is formed into an annular outer curled edge shape respectively, and the outer curled edge of each curled edge is formed on the opposite side of each micro blind hole (33);
The surface of the alumina passivation film layer is densely provided with a plurality of micro holes at intervals, each micro hole comprises at least one inwards concave micro cavity and a convex part which is opposite to the micro cavity and is arranged around the micro cavity in a convex way,
in the riveting processing step, the convex parts of the aluminum oxide passivation film layer are respectively inserted into the complex crystal film layer after the riveting processing, the complex crystal film layer is respectively inserted into the micro holes of the aluminum oxide passivation film layer, and all the interfaces of the complex crystal film layer and the aluminum oxide passivation film layer are in micro occlusion;
the upper opening of the miniature blind hole (33) is blocked and closed by the alumina passivation film layer after riveting processing, or the convex part of the alumina passivation film layer is inserted into the upper opening of the miniature blind hole (33) to block and close the upper opening of the miniature blind hole (33), so that each miniature blind hole (33) respectively forms a totally-closed micropore;
after riveting, each outer rolled hemming is pressed and deformed and respectively flattened on the upper hole edge of the corresponding miniature blind hole (33) to form a closed hole ring protruding out of the upper hole edge of the miniature blind hole (33).
6. The method for riveting an aluminum radiator according to any one of claims 1 to 5, characterized in that: the surface activation treatment substep comprises the following substeps which are sequentially executed,
1.21 Immersing the heat-dissipating aluminum fins (2) in an acid degreasing tank for 3-5 minutes, and removing surface impurities through the acid degreasing treatment, wherein the liquid medicine in the acid degreasing tank comprises sulfuric acid accounting for 5-15% of the total mass concentration of the liquid medicine, OP emulsifier accounting for 3-5% of the total mass concentration of the liquid medicine, sodium citrate accounting for 0.1-0.2% of the total mass concentration of the liquid medicine and the balance of water; the temperature of the liquid medicine in the acid degreasing tank is controlled at 40-50 ℃;
1.22 Washing with water, removing to a clear water tank for washing at least once after the soaking time is reached;
1.23 Immersing the heat-radiating aluminum fins (2) in an alkaline washing tank for 10-60 seconds, wherein the liquid medicine in the alkaline washing tank comprises sodium hydroxide accounting for 15-20% of the total mass concentration of the liquid medicine and the balance of water, the temperature of the liquid medicine in the alkaline washing tank is controlled at 60-70 ℃, and the surface impurities and the residual acid are further removed through the alkaline washing treatment;
1.24 Washing with water, removing to a clear water tank for washing at least once after the soaking time is reached;
1.25 Immersing the heat-dissipating aluminum fins (2) in a neutralization tank for 30-100 seconds, wherein the liquid medicine in the neutralization tank comprises 8-20% of nitric acid, 3-5% of neutralizing additive and the balance of water; the temperature of the liquid medicine in the neutralization tank is controlled at 20-30 ℃, and residual alkali is removed through neutralization treatment;
1.26 Activating treatment, namely immersing the radiating aluminum fins (2) into the first anodic oxidation treatment tank for 3-5 minutes; the liquid medicine in the first anodic oxidation treatment tank comprises sulfuric acid accounting for 18-20% of the total mass concentration of the liquid medicine, nickel sulfate accounting for 0.8-2% of the total mass concentration of the liquid medicine and the balance of water; the temperature of the liquid medicine in the first anodizing treatment tank is controlled at 23-25 ℃, and the anode voltage is controlled at 13-15V; depositing a solid non-porous aluminum oxide compact film layer with compact surface on the surface of the riveting part (21) through an anodic oxidation process, and controlling the density of the formed aluminum oxide compact film layer through nickel sulfate;
1.27 Washing with water, removing to a clear water tank for washing at least once after the soaking time is reached;
1.28 Surface activation treatment is completed.
7. The method for riveting an aluminum radiator according to claim 6, wherein: the tape Kong Nianmo layer (3) forming sub-steps, including the following sub-steps performed in sequence,
1.31 Forming a porous adhesive layer, immersing the heat-dissipating aluminum fins (2) subjected to the activation treatment into a second anodic oxidation treatment tank for 10-15 minutes; the liquid medicine in the second anodic oxidation treatment tank comprises sulfuric acid accounting for 10-15% of the total mass concentration of the liquid medicine, boric acid accounting for 1-3% of the total mass concentration of the liquid medicine, diammonium hydrogen phosphate accounting for 0.5-1% of the total mass concentration of the liquid medicine, stabilizing agent accounting for 0.5-1% of the total mass concentration of the liquid medicine and the balance of water; the liquid medicine temperature of the second anodizing treatment tank is controlled at 10-12 ℃ and the anode voltage is controlled at 20-25V, and the phase structure of the formed crystalline state is gamma-Al 2 O 3 Is densely covered with the complex crystal film layer of the micro blind holes (33) and is deposited on the surface of the alumina compact film layer.
8. The method for riveting an aluminum radiator according to claim 6, wherein: the surface passivation treatment sub-step of the riveting caulking groove comprises the following sub-steps which are sequentially executed,
2.21 Immersing the aluminum substrate (1) in an acid degreasing tank for 3-5 minutes, and removing surface impurities through the acid degreasing treatment, wherein the liquid medicine in the acid degreasing tank comprises sulfuric acid accounting for 5-15% of the total mass concentration of the liquid medicine, OP emulsifier accounting for 3-5% of the total mass concentration of the liquid medicine, TX-10 emulsifier accounting for 3-5% of the total mass concentration of the liquid medicine, sodium citrate accounting for 0.1-0.2% of the total mass concentration of the liquid medicine and the balance of water; the temperature of the liquid medicine in the acid degreasing tank is controlled at 40-50 ℃;
2.22 Washing with water, removing to a clear water tank for washing at least once after the soaking time is reached;
2.23 Immersing the aluminum substrate (1) in an alkaline washing tank for 10-60 seconds, wherein the liquid medicine in the alkaline washing tank comprises sodium hydroxide accounting for 15-20% of the total mass concentration of the liquid medicine and the balance of water, the temperature of the liquid medicine in the alkaline washing tank is controlled at 60-70 ℃, and the surface impurities and the residual acid are further removed through the alkaline washing treatment;
2.24 Washing with water, removing to a clear water tank for washing at least once after the soaking time is reached;
2.25 Immersing the aluminum substrate (1) in a neutralization tank for 30-100 seconds, wherein the liquid medicine in the neutralization tank comprises 8-20% of nitric acid, 3-5% of neutralization additive and the balance of water, wherein the total mass concentration of the liquid medicine is 8-20%; the temperature of the liquid medicine in the neutralization tank is controlled at 20-30 ℃, and residual alkali is removed through neutralization treatment;
2.26 Surface passivation treatment, namely immersing the aluminum substrate (1) into a surface passivation groove for 3-5 minutes; the liquid medicine in the surface passivation tank comprises 10-15% of chromium chloride, 1-3% of potassium formate, 3-5% of sodium citrate, 0.5-1% of glycerol, 1-3% of boric acid, 0.5-1% of sodium dodecyl sulfate and the balance of water;
the pH value of the liquid medicine in the surface passivation tank is controlled to be 3-4; the temperature of the liquid medicine in the surface passivation tank is controlled at 20-30 ℃;
performing surface passivation treatment on at least each riveting groove (11) through a surface passivation groove, and forming an aluminum oxide passivation film layer on at least each surface of each riveting groove (11) of the aluminum substrate (1);
2.27 Cold water washing, namely, after the soaking time is up, removing the water into a cold water clear water tank for water washing, and at least carrying out cold water washing once;
2.28 Hot water washing, namely, after the cold water washing reaches the soaking time, removing the water to a hot water clear water tank for washing, and at least washing once with hot water;
2.29 Drying the surface water;
2.30 Baking, namely drying the aluminum substrate (1) for drying, and then placing the aluminum substrate into a baking oven to bake for 25-35 minutes, wherein the temperature of the baking oven is controlled to be 80-90 ℃ to harden the sand surface, so that the surface hardness of the aluminum oxide passivation film layer is higher than that of the complex compound crystallization film layer;
2.31 Surface passivation treatment is completed.
9. An aluminum radiator with an improved riveting structure, which comprises an aluminum substrate (1) and a plurality of flaky radiating aluminum fins (2), wherein the lower parts of the radiating aluminum fins are respectively provided with a riveting part (21), and the aluminum radiator is characterized in that:
the riveting surface of the aluminum base material (1) is provided with a plurality of riveting grooves (11) which are subjected to surface passivation treatment at intervals, and each surface of the riveting grooves (11) is respectively formed with an aluminum oxide passivation film layer;
the surface of the riveting part (21) of each radiating aluminum fin (2) is respectively compounded with a perforated mucous membrane layer (3) with self-adhesive surface;
the tape Kong Nianmo layer (3) comprises a non-porous solid barrier layer (31) attached to the surface of the rivet (21), and a porous adhesive layer (32) attached to the surface of the non-porous solid barrier layer (31) and having tackiness on the surface;
The nonporous solid barrier layer (31) is an alumina compact film layer deposited on the surface of the riveting part (21) during the activation treatment of the anodic oxidation treatment;
the tape Kong Nianzhi layer (32) is a complex crystalline film layer having a hardness smaller than that of the aluminum substrate (1) deposited on the surface of the alumina dense film layer during the anodizing treatment without using a pore sealing treatment;
after the riveting processing, each riveting part (21) is respectively fixed in a corresponding riveting groove (11) in a riveting way, the riveting part (21) is in interference fit with the riveting groove (11), the tape Kong Nianmo layer (3) is filled between the riveting part (21) and the riveting groove (11), and the perforated mucous membrane layer (3) of each riveting part (21) is respectively in mutual snap fit with the corresponding alumina passivation film layer of each riveting groove (11).
10. An aluminum radiator with improved riveting structure as claimed in claim 9, wherein: the lower end parts of the radiating aluminum fins (2) are reversely bent upwards and are overlapped and fixedly pressed on the lower parts of the radiating aluminum fins (2), a U-shaped riveting part (21) is formed at the lower end parts of the radiating aluminum fins (2), and at least one groove (22) extending longitudinally for a set length or penetrating longitudinally through the riveting part (21) is formed at the left side and the right side of the riveting part (21) respectively;
the width of the riveting caulking groove (11) is not smaller than the width of the corresponding riveting part (21) before riveting;
The surface of the alumina passivation film layer is densely provided with a plurality of micro holes at intervals, each micro hole comprises at least one inwards concave micro cavity and convex parts which are opposite to the micro cavity and are arranged around the micro cavity in a convex mode, and the surface of the riveting slot (11) is in a honeycomb-shaped sand surface shape;
the surface of the layer (32) of the tape Kong Nianzhi is densely provided with a plurality of micro blind holes (33), the top surface of each micro blind hole (33) respectively penetrates through the top surface of the porous adhesive layer (32) and forms an upper opening, and each micro blind hole (33) is arranged in a hexagonal symmetrical cycle in a two-dimensional plane and forms a face-centered structure;
after the riveting processing, the wall bodies at the middle upper parts of the left side wall and the right side wall of each riveting embedding groove (11) are respectively embedded into grooves (22) of corresponding riveting embedding parts (21), and each heat-dissipating aluminum fin (2) is respectively erected at the upper parts of the riveting surfaces of the aluminum substrates (1);
the convex parts of the aluminum oxide passivation film layers of the riveting slots (11) are respectively inserted into the complex crystal film layers of the corresponding riveting parts (21) after riveting, the complex crystal film layers of the riveting parts (21) are respectively inserted into the corresponding micro holes of the aluminum oxide passivation film layers of the corresponding riveting slots (11), and all the joint surfaces of the complex crystal film layers and the corresponding aluminum oxide passivation film layers are in micro occlusion.
11. An aluminum radiator with improved riveting structure as claimed in claim 10, wherein: the upper opening of the micro blind hole (33) is blocked and closed by the alumina passivation film layer after riveting, or the convex part of the alumina passivation film layer is inserted into the upper opening of the micro blind hole (33) to block and close the upper opening of the micro blind hole (33), and each micro blind hole (33) respectively forms a totally-closed micropore;
the total thickness of the layer (3) of the tape Kong Nianmo is controlled to be 20-50 microns, the thickness of the complex crystal film layer is controlled to be 10-30 microns, the average width of the micro blind holes (33) on the formed complex crystal film layer is controlled to be 1-5 microns, and the average depth is controlled to be 5-20 microns.
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| CN111541317B (en) * | 2020-07-07 | 2021-02-26 | 江苏嘉轩智能工业科技股份有限公司 | Air-cooled permanent magnet roller |
| CN112126919A (en) * | 2020-08-24 | 2020-12-25 | 安徽未来表面技术有限公司 | Passivation method of aluminum hexavalent chromium passivator |
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