CN107891248B - Processing technology of battery pack magnesium alloy tray for new energy automobile - Google Patents
Processing technology of battery pack magnesium alloy tray for new energy automobile Download PDFInfo
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- CN107891248B CN107891248B CN201710923960.9A CN201710923960A CN107891248B CN 107891248 B CN107891248 B CN 107891248B CN 201710923960 A CN201710923960 A CN 201710923960A CN 107891248 B CN107891248 B CN 107891248B
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- 229910000861 Mg alloy Inorganic materials 0.000 title claims abstract description 78
- 238000012545 processing Methods 0.000 title claims abstract description 43
- 238000005516 engineering process Methods 0.000 title claims abstract description 29
- 238000005452 bending Methods 0.000 claims abstract description 50
- 238000003466 welding Methods 0.000 claims abstract description 39
- 238000011049 filling Methods 0.000 claims abstract description 31
- 239000004576 sand Substances 0.000 claims abstract description 17
- 238000003754 machining Methods 0.000 claims abstract description 8
- 238000005406 washing Methods 0.000 claims description 120
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 90
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 25
- 238000010438 heat treatment Methods 0.000 claims description 24
- 239000011248 coating agent Substances 0.000 claims description 21
- 238000000576 coating method Methods 0.000 claims description 21
- 238000005238 degreasing Methods 0.000 claims description 20
- 239000000126 substance Substances 0.000 claims description 16
- 230000015572 biosynthetic process Effects 0.000 claims description 13
- 239000000395 magnesium oxide Substances 0.000 claims description 13
- 230000003750 conditioning effect Effects 0.000 claims description 12
- 230000004913 activation Effects 0.000 claims description 10
- 239000002114 nanocomposite Substances 0.000 claims description 10
- 238000005507 spraying Methods 0.000 claims description 10
- 239000008235 industrial water Substances 0.000 claims description 9
- 230000003647 oxidation Effects 0.000 claims description 8
- 238000007254 oxidation reaction Methods 0.000 claims description 8
- 238000005524 ceramic coating Methods 0.000 claims description 6
- 238000012937 correction Methods 0.000 claims description 6
- 238000001514 detection method Methods 0.000 claims description 6
- 238000006073 displacement reaction Methods 0.000 claims description 6
- 238000007689 inspection Methods 0.000 claims description 6
- 210000001503 joint Anatomy 0.000 claims description 6
- 238000011068 loading method Methods 0.000 claims description 6
- 238000003801 milling Methods 0.000 claims description 6
- 230000010355 oscillation Effects 0.000 claims description 6
- 238000005498 polishing Methods 0.000 claims description 6
- 239000003973 paint Substances 0.000 claims description 5
- 239000012528 membrane Substances 0.000 claims description 4
- 238000000108 ultra-filtration Methods 0.000 claims description 4
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 3
- 238000001962 electrophoresis Methods 0.000 claims description 3
- 238000010422 painting Methods 0.000 claims description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 2
- 239000003153 chemical reaction reagent Substances 0.000 claims description 2
- 239000010985 leather Substances 0.000 claims 1
- 238000011161 development Methods 0.000 abstract description 12
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 238000005536 corrosion prevention Methods 0.000 abstract description 3
- 238000004134 energy conservation Methods 0.000 abstract description 3
- 230000006855 networking Effects 0.000 abstract description 3
- 230000009467 reduction Effects 0.000 abstract description 3
- 238000009776 industrial production Methods 0.000 abstract description 2
- 238000011031 large-scale manufacturing process Methods 0.000 abstract description 2
- 239000000463 material Substances 0.000 description 13
- 230000018109 developmental process Effects 0.000 description 9
- 238000000034 method Methods 0.000 description 9
- 239000000919 ceramic Substances 0.000 description 8
- 239000000956 alloy Substances 0.000 description 7
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 6
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical group [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 6
- 239000003513 alkali Substances 0.000 description 6
- 239000002245 particle Substances 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 239000004033 plastic Substances 0.000 description 3
- 229920003023 plastic Polymers 0.000 description 3
- 229910000838 Al alloy Inorganic materials 0.000 description 2
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000002585 base Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000013016 damping Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 239000011777 magnesium Substances 0.000 description 2
- 229910052749 magnesium Inorganic materials 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 229920006351 engineering plastic Polymers 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000009501 film coating Methods 0.000 description 1
- 239000007888 film coating Substances 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 description 1
- 239000000347 magnesium hydroxide Substances 0.000 description 1
- 229910001862 magnesium hydroxide Inorganic materials 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000011859 microparticle Substances 0.000 description 1
- 239000002086 nanomaterial Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 239000004753 textile Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
-
- 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
- C25D11/30—Anodisation of magnesium or alloys based thereon
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D13/00—Electrophoretic coating characterised by the process
- C25D13/02—Electrophoretic coating characterised by the process with inorganic material
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Inorganic Chemistry (AREA)
- Battery Mounting, Suspending (AREA)
- Sealing Battery Cases Or Jackets (AREA)
Abstract
The invention discloses a processing technology of a magnesium alloy tray wrapped by a battery for a new energy automobile, which comprises a sand filling step, a bending step, a welding step, a tray machining step and a surface corrosion prevention step. According to the processing technology of the magnesium alloy tray for the battery pack for the new energy automobile, large-scale and industrial production can be realized through the processing technology, the high-quality magnesium alloy tray for the automobile battery pack is obtained, a new development direction is opened for deep processing application of magnesium alloy, meanwhile, along with the development of new energy automobiles, energy conservation and emission reduction are trends of development of times and directions greatly encouraged and supported by the nation, the automobile is an intelligent networking time and a light-weight time in the future, particularly along with the increase of the quantity of magnesium alloy parts for the automobile, the production cost is lower, and the magnesium alloy tray for the automobile battery pack can form a powerful support for the deep processing application of magnesium alloy.
Description
Technical Field
The invention relates to a deep processing technology of magnesium alloy sections and pipes, in particular to a processing technology of a battery pack magnesium alloy tray for a new energy automobile.
Background
Compared with plastics, the magnesium alloy material has the advantages of light weight, high specific strength, good vibration damping property, good thermal fatigue property, difficult aging, good thermal conductivity, strong electromagnetic shielding capability, good vibration damping property, easy recovery and the like, and is a new generation of high-performance structural material for replacing steel, aluminum alloy and engineering plastics. The magnesium alloy is an ideal material for the shells of products such as traffic, electronic information, communication, computers, audio-visual equipment, handheld tools, motors, forestry, textiles and the like. The developed countries attach great importance to the development and application of magnesium alloy, especially to portable electronic products such as automobile parts and notebook computers, which are increased by 20% every year, and are very attractive, the development speed is remarkable, and magnesium alloy sections and pipes are also used for manufacturing bicycle frames, wheelchairs, rehabilitation and medical appliances.
At present, magnesium alloy products are mainly formed parts by casting and machined parts, but not plastic deformation parts. Magnesium has a close-packed hexagonal crystal structure, has a c/a axis ratio of 1.623, and has only one slip system at room temperature, so that it has low ductility and is difficult to mold. The traditional magnesium alloy plastic deformation process is carried out according to the extrusion, forging and bending processes of copper and aluminum of nonferrous metals, and is not special equipment and special processes for bending and welding magnesium alloy sections and pipes, so that the efficiency is low, the yield is low, the cost is high, the quality is unstable, and the development of magnesium material preparation is restricted.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a processing technology of a magnesium alloy tray of a battery pack for a new energy automobile, which can realize large-scale and industrialized production, open up a new development direction for deep processing application of magnesium alloy, meanwhile, along with the development of new energy automobiles, energy conservation and emission reduction are trends of development of times and are also directions greatly encouraged and supported by the nation, the automobile is an intelligent networking time and a light-weight time in the future, and particularly along with the increase of the quantity of magnesium alloy parts for the automobile, the production cost is lower, and the processing technology can form a strong support for the deep processing application of the magnesium alloy.
The purpose of the invention is realized by adopting the following technical scheme:
processing technology of a magnesium alloy tray wrapped by a battery for a new energy automobile comprises the following steps:
sand filling step: setting the size of the magnesium alloy section and the pipe, then blanking, pouring magnesia, filling and oscillating;
a bending step: placing the magnesium alloy section and the pipe after sand filling into a heating furnace for heating, then carrying out clamping and conveying displacement detection, then carrying out primary bending and secondary bending on the magnesium alloy section and the pipe, and then carrying out size inspection and correction;
a welding step: processing the welding end section of the magnesium alloy section and the pipe by a milling machine, after conveying and loading, clamping and positioning a welding station, then correcting a welding butt joint surface, performing laser welding on the magnesium alloy section and the pipe, and then welding a bottom plate to obtain a tray workpiece;
machining a tray: clamping the hole site workpiece, processing a screw hole of the pallet workpiece frame, taking the workpiece, inspecting, and performing surface polishing treatment;
surface anticorrosion step: and performing surface anticorrosion treatment on the tray workpiece to obtain the automobile battery pack tray workpiece.
Furthermore, in the step of sand filling, the filling speed is 3-4.5L/min, and the oscillation frequency is 6-10 times/second.
Furthermore, in the step of sand filling, the mesh number of the magnesia is 60-100 meshes.
Further, in the bending step, the heating temperature is 300-350 ℃.
Further, in the bending step, the bending moment and the torque of the primary bending and the secondary bending are both 1800-3000 Nm.
Further, the surface anticorrosion treatment is chemical film formation and spraying treatment, and specifically comprises the steps of degreasing, first washing, second washing, activation, third washing, fourth washing, surface conditioning, sixth washing, seventh washing, eighth washing, chemical film formation, ninth washing, tenth washing and pure water washing of the tray workpiece, and spraying paint on the surface of the tray workpiece.
Further, in the degreasing step, the treatment temperature is 60-70 ℃, and the treatment time is 240-; in the activation step, the treatment temperature is 60-65 ℃, and the treatment time is 60-90 seconds; in the surface conditioning step, the treatment temperature is 70-80 ℃, and the treatment time is 180-; in the formation step, the treatment temperature is 35-45 ℃ and the treatment time is 20-40 seconds.
Furthermore, the reagents used in the first water washing, the second water washing, the third water washing, the fourth water washing, the sixth water washing and the seventh water washing are all industrial water, and the treatment time is 10-60 seconds at normal temperature; eighth washing with pure water for 10-60 s at normal temperature; the eighth water washing uses pure water as the chemical, and the treatment time is 10-60 seconds at normal temperature.
Further, the agents used in the ninth water washing, the tenth water washing and the pure water washing were pure water, and the treatment time at normal temperature was at least 60 seconds.
Further, the surface anticorrosion treatment is oxidation and electrophoretic coating treatment, and specifically comprises the steps of hanging a tray workpiece on a chemical degreasing way after the tray workpiece is subjected to anodic oxidation treatment, carrying out primary double-lattice cold water washing, then carrying out secondary double-lattice cold water washing after pre-degreasing and main degreasing, carrying out primary water washing again, forming a skin membrane electrode after surface conditioning, carrying out secondary water washing and tertiary water washing again, carrying out pure water washing again, carrying out electrophoretic painting after draining, carrying out ultrafiltration circulating water washing again, cooling after draining and drying, and then hanging the tray workpiece obliquely.
The invention has the beneficial effects that:
1. the processing technology of the magnesium alloy tray wrapped by the battery for the new energy automobile comprises a sand filling step, a bending step, a welding step, a tray machining step and a surface corrosion prevention step, can realize large-scale and industrial production through the processing technology, obtains the high-quality magnesium alloy tray wrapped by the automobile battery, develops a new development direction for deep processing application of magnesium alloy, and simultaneously, along with the development of new energy automobiles, energy conservation and emission reduction are trends of development of times and directions of encouragement and support by the nation, the automobile is an intelligent networking era in the future, and is a lightweight era, particularly along with the increase of the quantity of magnesium alloy parts for the automobile, the production cost is lower, and the technology can form a strong support for the deep processing application of magnesium alloy;
2. the unique physical and chemical properties of magnesium alloy determine that the bending processing of the section and the pipe is necessarily required to be heated, the traditional bending and core pulling are not beneficial to insertion during heating, the R radius deformation direction during bending cannot be controlled, and the size requirement cannot be met, and researches find that the selection of a material with the heat conductivity close to that of a magnesium alloy material is a key material, so that the problems of high and low heat absorption speed and low heat dissipation speed of the outer part and the inner part, which causes the defect of poor temperature of the inner and outer parts of the bent material, and the problem of external deformation and tearing during bending, are avoided, the technology realizes automatic filling, and combines the technology of filling and vibrating magnesia to well solve the problem of poor temperature of the inner and outer parts of the bent material during heating, and can also realize;
3. in the bending step, because the magnesium alloy material is sensitive to the heating temperature and directly influences the ductility of the material, the electric heating mode of the heating furnace is adopted to sequentially guide the left feeding to the right discharging, and the stepping heating furnace effectively ensures the uniformity of the temperature of the continuous heating, feeding and heating material;
4. according to the invention, in the electrophoresis step of surface corrosion prevention, the cathode electrophoresis coating is carried out on the outer surface of the pretreated workpiece, a compact coating is formed on the surface of the workpiece, the coating is a high-temperature-resistant insulating heat-conducting coating, the coating is a single component and is an alcohol system inorganic nano composite ceramic coating, the nano ceramic dispersion process technology is adopted, the dispersion is more uniform and stable, the treatment of a bonding interface between nano micro particles is efficient and stable, and the better bonding strength between the nano composite ceramic coating and a base material and the more excellent and stable performance are ensured; the formula of the nano composite ceramic is compounded, so that the function of the nano composite ceramic coating is controllable; the nano composite ceramic coating presents a good micro-nano structure, the nano composite ceramic particles completely wrap the micron composite ceramic particles, gaps among the micron composite ceramic particles are filled with the nano composite ceramic particles to form a compact coating, the nano composite ceramic particles penetrate through the surface of the filling and repairing base material, so that a large amount of stable metal ceramic intermediate phase can be formed more easily, flame resistance or high-temperature airflow direct scouring can be completely achieved, the problem of flame retardance of magnesium alloy materials is solved, and the nano composite ceramic coating can be further applied and popularized in the fields of automobiles, aerospace and the like;
5. the technology has higher automation degree, is suitable for bending and processing different deformed magnesium alloy sectional materials and pipe materials, ensures that the new energy battery pack tray assembly has the product quality of 80Kg from the original steel product to 30Kg of aluminum alloy, replaces the product quality of 20Kg with magnesium alloy material, and reduces the weight of 3/4 compared with the original product quality of 30Kg, and the implementation of the technology can ensure that the whole car factory can meet the national policy requirements, promote the whole car factory to obtain favorable position on the light weight of the car and improve the occupancy rate of the whole car factory in the new energy automobile market.
Detailed Description
The present invention is further described below with reference to specific embodiments, and it should be noted that, without conflict, any combination between the embodiments or technical features described below may form a new embodiment.
Processing technology of a magnesium alloy tray wrapped by a battery for a new energy automobile comprises the following steps:
sand filling step: setting the size of the magnesium alloy section and the pipe, then blanking, pouring magnesia, filling and oscillating;
a bending step: placing the magnesium alloy section and the pipe after sand filling into a heating furnace for heating, then carrying out clamping and conveying displacement detection, then carrying out primary bending and secondary bending on the magnesium alloy section and the pipe, and then carrying out size inspection and correction;
a welding step: processing the welding end section of the magnesium alloy section and the pipe by a milling machine, after conveying and loading, clamping and positioning a welding station, then correcting a welding butt joint surface, performing laser welding on the magnesium alloy section and the pipe, and then welding a bottom plate to obtain a tray workpiece;
machining a tray: clamping the hole site workpiece, processing a screw hole of the pallet workpiece frame, taking the workpiece, inspecting, and performing surface polishing treatment;
surface anticorrosion step: and performing surface anticorrosion treatment on the tray workpiece to obtain the automobile battery pack tray.
As a further implementation mode, in the sand filling step, the filling speed is 3-4.5L/min, and the oscillation frequency is 6-10 times/second.
In a further embodiment, in the step of sand filling, the mesh number of the magnesia is 60 to 100 meshes.
As a further implementation mode, in the bending step, the heating temperature is 300-350 ℃.
As a further embodiment, in the bending step, the bending moment and the torque of the primary bending and the secondary bending are 1800-3000 Nm.
In a further embodiment, the surface anticorrosion treatment is a chemical film coating and spraying treatment, and specifically, the surface of the pallet workpiece is sprayed with a paint after degreasing, first washing, second washing, activation, third washing, fourth washing, surface conditioning, sixth washing, seventh washing, eighth washing, chemical conversion, ninth washing, tenth washing and pure water washing. The activation step has the effects of removing the oxide on the surface of the magnesium alloy and forming the product, so as to achieve the purpose of cleaning the surface of the product; the surface adjusting step can remove the residual substances in the activating procedure to achieve the effect of smoothing the surface of the product; the formation step produces a compact protective film on the surface of the product, and the effects of improving the corrosion resistance and the coating adhesive force of the product are achieved.
As a further embodiment, in the degreasing step, the treatment temperature is 60-70 ℃, and the treatment time is 240-; in the activation step, the treatment temperature is 60-65 ℃, and the treatment time is 60-90 seconds; in the surface conditioning step, the treatment temperature is 70-80 ℃, and the treatment time is 180-; in the formation step, the treatment temperature is 35-45 ℃ and the treatment time is 20-40 seconds.
In a further embodiment, the first water washing, the second water washing, the third water washing, the fourth water washing, the sixth water washing and the seventh water washing all use industrial water, and the treatment time is 10 to 60 seconds at normal temperature; eighth washing with pure water for 10-60 s at normal temperature; the eighth water washing uses pure water as the chemical, and the treatment time is 10-60 seconds at normal temperature.
In a further embodiment, the agents used in the ninth water washing, the tenth water washing and the pure water washing are pure water, and the treatment time at room temperature is at least 60 seconds.
As a further embodiment, the surface anticorrosion treatment is oxidation and electrophoretic coating treatment, and specifically, after the tray workpiece is subjected to anodic oxidation treatment, the tray workpiece is chemically degreased by hanging, is subjected to primary double-lattice cold water washing, is subjected to pre-degreasing and primary degreasing, is subjected to secondary double-lattice cold water washing, is subjected to primary water washing again, is subjected to surface conditioning and then is converted into a skin membrane electrode, is subjected to secondary water washing and tertiary water washing again, is subjected to pure water washing again, is subjected to draining, is subjected to electrophoretic coating, is subjected to ultrafiltration circulating water washing again, is cooled after draining and drying, and is then hung obliquely. After the conventional anodic oxidation treatment, a compact oxide film layer is formed on the surface of the workpiece, and the film layer mainly comprises magnesium oxide and hexagonal magnesium hydroxide and is well combined with a matrix. Performing cathode electrophoretic coating on the outer surface of the pretreated workpiece to form a compact high-temperature-resistant insulating heat-conducting coating on the surface of the workpiece; the surface coating thickness was >15umm, and the upper and lower surface coating thicknesses should be uniform.
The surface anticorrosion step is to carry out anticorrosion and wear-resistant treatment on the magnesium alloy automobile battery pack tray, and the experimental result of a coating salt spray test can reach 720 hours.
The following are specific examples of the present invention, and raw materials, equipments and the like used in the following examples can be obtained by purchasing them unless otherwise specified.
Example 1:
processing technology of a magnesium alloy tray wrapped by a battery for a new energy automobile comprises the following steps:
sand filling step: blanking after setting the size of the magnesium alloy section bar and the size of the pipe, then pouring magnesia, wherein the mesh number of the magnesia is 60-100 meshes, oscillating after full filling, the filling speed is 3L/min, and the oscillation frequency is 8 times/second;
a bending step: heating the magnesium alloy section and the pipe in a heating furnace at the heating temperature of 320 ℃, carrying out pinch displacement detection, carrying out primary bending and secondary bending on the magnesium alloy section and the pipe, wherein the bending moment and the torque of the primary bending and the secondary bending are both 2000Nm, and carrying out size inspection and correction;
a welding step: processing the welding end sections of the magnesium alloy section and the pipe by a milling machine, after conveying and loading, clamping and positioning a welding station, then correcting a welding butt joint surface, performing laser welding on the magnesium alloy section and the pipe, and then welding a bottom plate to obtain a tray workpiece;
machining a tray: clamping the hole site workpiece, processing a screw hole of the pallet workpiece frame, taking the workpiece, inspecting, and performing surface polishing treatment;
surface anticorrosion step: namely, forming a film and spraying, specifically, after degreasing, first washing, second washing, activation, third washing, fourth washing, surface conditioning, sixth washing, seventh washing, eighth washing, forming, ninth washing, tenth washing and pure water washing, a tray workpiece is subjected to surface spraying paint, and the battery magnesium-clad alloy tray is obtained.
The specific steps of the chemical film formation are shown in the following table, and the alkali liquor can be sodium hydroxide or potassium hydroxide:
table 1 coating formation procedure of example 1
| Treatment process | Use of a medicament | Concentration of | Temperature of | Time of treatment | Remarks for note |
| Degreasing | Alkali liquor | 5％(w/v) | 65℃ | 360 seconds | Ultrasonic wave |
| First water washing | Industrial water | At normal temperature | 30 seconds | Overflow | |
| Second water washing | Industrial water | At normal temperature | 30 seconds | Overflow | |
| Activation of | Alkali liquor | 10％(w/v) | 60℃ | 80 seconds | |
| Third Water washing | Industrial water | At normal temperature | 180 seconds | Ultrasonic wave | |
| Fourth Water washing | Industrial water | At normal temperature | 40 seconds | Overflow | |
| Watch regulator | Alkali liquor | 15％(w/v) | 75℃ | 200 seconds | |
| Fifth Water washing | Industrial water | At normal temperature | 30 seconds | Overflow | |
| Seventh Water washing | Industrial water | At normal temperature | 30 seconds | Overflow | |
| Eighth Water washing | Pure water | At normal temperature | 30 seconds | Overflow | |
| Formation of | Alkali liquor | 10％(w/v) | 40℃ | 30 seconds | |
| Ninth Water washing | Pure water | At normal temperature | 90 seconds | Overflow | |
| The tenth Water washing | Pure water | At normal temperature | 120 seconds | Overflow | |
| Pure water washing | Pure water | At normal temperature | 160 seconds | Overflow |
Example 2:
processing technology of a magnesium alloy tray wrapped by a battery for a new energy automobile comprises the following steps:
sand filling step: setting the size of a magnesium alloy section and a pipe, then blanking, pouring magnesia, wherein the mesh number of the magnesia is 60 meshes, and oscillating after filling, wherein the filling speed is 4L/min, and the oscillation frequency is 6 times/second;
a bending step: heating the magnesium alloy section and the pipe in a heating furnace at the heating temperature of 300 ℃, carrying out pinch displacement detection, carrying out primary bending and secondary bending on the magnesium alloy section and the pipe, wherein the bending moment and the torque of the primary bending and the secondary bending are 1800Nm, and carrying out size inspection and correction;
a welding step: processing the welding end section of the magnesium alloy section and the pipe by a milling machine, after conveying and loading, clamping and positioning a welding station, then correcting a welding butt joint surface, performing laser welding on the magnesium alloy section and the pipe, and then welding a bottom plate to obtain a tray workpiece;
machining a tray: clamping the hole site workpiece, processing a screw hole of the pallet workpiece frame, taking the workpiece, inspecting, and performing surface polishing treatment;
surface anticorrosion step: namely, forming a film and spraying, specifically, after degreasing, first washing, second washing, activation, third washing, fourth washing, surface conditioning, sixth washing, seventh washing, eighth washing, forming, ninth washing, tenth washing and pure water washing, a tray workpiece is subjected to surface spraying paint, and the battery magnesium-clad alloy tray is obtained.
The specific steps of the chemical film formation are shown in the following table, and the alkali liquor can be sodium hydroxide or potassium hydroxide:
table 2 coating formation procedure of example 2
Example 3:
processing technology of a magnesium alloy tray wrapped by a battery for a new energy automobile comprises the following steps:
sand filling step: blanking the section bar and the pipe after setting the size, then pouring magnesia with the mesh number of 100 meshes, oscillating after filling, wherein the filling speed is 4.5L/min, and the oscillation frequency is 10 times/second, so as to obtain the magnesium alloy section bar and the pipe;
a bending step: heating the magnesium alloy section and the pipe in a heating furnace at 350 ℃, carrying out pinch displacement detection, carrying out primary bending and secondary bending on the magnesium alloy section and the pipe, wherein the bending moment and the torque of the primary bending and the secondary bending are both 3000Nm, and carrying out size inspection and correction;
a welding step: processing the welding end sections of the magnesium alloy section and the pipe by a milling machine, after conveying and loading, clamping and positioning a welding station, then correcting a welding butt joint surface, performing laser welding on the magnesium alloy section and the pipe to achieve the strength of more than 95%, and then welding a bottom plate to obtain a tray workpiece;
machining a tray: clamping the hole site workpiece, processing a screw hole of the pallet workpiece frame, taking the workpiece, inspecting, and performing surface polishing treatment;
surface anticorrosion step: the method specifically comprises the steps of carrying out anodic oxidation treatment on a tray workpiece, hanging chemical degreasing on the tray workpiece, carrying out primary double-lattice cold water washing, pre-degreasing, primary degreasing, carrying out secondary double-lattice cold water washing, carrying out primary water washing again, carrying out surface conditioning, forming into a skin membrane electrode, carrying out secondary water washing and tertiary water washing, carrying out pure water washing again, carrying out electrophoretic painting after draining, carrying out ultrafiltration circulating water washing again, cooling after draining, and hanging obliquely to obtain the magnesium alloy tray wrapped by the battery.
The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are within the protection scope of the present invention.
Claims (7)
1. Processing technology of battery package magnesium alloy tray for new energy automobile, which is characterized by comprising the following steps:
sand filling step: setting the size of the magnesium alloy section and the pipe, then blanking, pouring magnesia, filling and oscillating;
a bending step: placing the magnesium alloy section and the pipe after sand filling into a heating furnace for heating, then carrying out clamping and conveying displacement detection, then carrying out primary bending and secondary bending on the magnesium alloy section and the pipe, and then carrying out size inspection and correction; the heating temperature is 300-350 ℃; the bending moment and the torque of the primary bending and the secondary bending are both 1800-3000 Nm;
a welding step: processing the welding end section of the magnesium alloy section and the pipe by a milling machine, after conveying and loading, clamping and positioning a welding station, then correcting a welding butt joint surface, performing laser welding on the magnesium alloy section and the pipe, and then welding a bottom plate to obtain a tray workpiece;
machining a tray: clamping the hole site workpiece, processing a screw hole of the pallet workpiece frame, taking the workpiece, inspecting, and performing surface polishing treatment;
surface anticorrosion step: carrying out surface anticorrosion treatment on the tray workpiece to obtain an automobile battery pack tray;
the surface anticorrosion treatment is chemical film formation and spraying treatment, and specifically comprises the steps of carrying out degreasing, first water washing, second water washing, activation, third water washing, fourth water washing, surface conditioning, sixth water washing, seventh water washing, eighth water washing, chemical film formation, ninth water washing, tenth water washing and pure water washing on a tray workpiece, and spraying paint on the surface of the tray workpiece;
the spraying treatment is cathode electrophoresis coating, a compact coating is formed on the surface of the workpiece, and the coating is an alcohol system inorganic nano composite ceramic coating.
2. The processing technology of the battery pack magnesium alloy tray for the new energy automobile according to claim 1, characterized in that: in the step of sand filling, the filling speed is 3-4.5L/min, and the oscillation frequency is 6-10 times/second.
3. The processing technology of the battery pack magnesium alloy tray for the new energy automobile according to claim 1, characterized in that: in the step of pouring the sand, the mesh number of the magnesia is 60-100 meshes.
4. The processing technology of the battery pack magnesium alloy tray for the new energy automobile according to claim 1, characterized in that: in the degreasing step, the treatment temperature is 60-70 ℃, and the treatment time is 240-; in the activation step, the treatment temperature is 60-65 ℃, and the treatment time is 60-90 seconds; in the surface conditioning step, the treatment temperature is 70-80 ℃, and the treatment time is 180-; in the formation step, the treatment temperature is 35-45 ℃ and the treatment time is 20-40 seconds.
5. The processing technology of the battery pack magnesium alloy tray for the new energy automobile according to claim 1, characterized in that: the reagents used in the first water washing, the second water washing, the third water washing, the fourth water washing, the sixth water washing and the seventh water washing are all industrial water, and the treatment time is 10-60 seconds at normal temperature; the eighth water washing uses pure water as the chemical, and the treatment time is 10-60 seconds at normal temperature.
6. The processing technology of the battery pack magnesium alloy tray for the new energy automobile according to claim 1, characterized in that: the agents used in the ninth water washing, the tenth water washing and the pure water washing are pure water, and the treatment time at normal temperature is at least 60 seconds.
7. The processing technology of the battery pack magnesium alloy tray for the new energy automobile according to claim 1, characterized in that: the surface anticorrosion treatment is oxidation and electrophoretic coating treatment, and specifically comprises the steps of hanging chemical degreasing on a tray workpiece after the tray workpiece is subjected to anodic oxidation treatment, carrying out primary double-lattice cold water washing, then carrying out pre-degreasing and primary degreasing, carrying out secondary double-lattice cold water washing, carrying out primary washing again, forming a leather membrane after surface conditioning, carrying out secondary washing and tertiary washing again, carrying out pure water washing again, carrying out electrophoretic painting after draining, carrying out ultrafiltration circulating washing again, cooling after draining and drying, and then hanging the tray workpiece obliquely.
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| CN106684276A (en) * | 2015-11-11 | 2017-05-17 | 上海汽车集团股份有限公司 | Power battery system and tray thereof |
| CN206279277U (en) * | 2016-12-23 | 2017-06-27 | 青岛哈船船舶装备制造有限公司 | Preservative treatment and oxidation unit |
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| CN101265605A (en) * | 2008-05-09 | 2008-09-17 | 沈阳工业大学 | Magnesium and magnesium alloy cathode electrophoresis surface treating method |
| JP2013133044A (en) * | 2011-12-27 | 2013-07-08 | Kobe Steel Ltd | On-vehicle battery tray and on-vehicle battery frame |
| CN103433341A (en) * | 2013-08-19 | 2013-12-11 | 天津东义镁制品股份有限公司 | Magnesium alloy extruded tube and method for brake forming of magnesium alloy extruded tube |
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