CN114411026B - Charging pile aluminum alloy plate for new energy vehicle and preparation method thereof - Google Patents

Charging pile aluminum alloy plate for new energy vehicle and preparation method thereof Download PDF

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CN114411026B
CN114411026B CN202111580403.4A CN202111580403A CN114411026B CN 114411026 B CN114411026 B CN 114411026B CN 202111580403 A CN202111580403 A CN 202111580403A CN 114411026 B CN114411026 B CN 114411026B
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aluminum alloy
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alloy plate
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CN114411026A (en
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曲江锋
李国锋
姚明辉
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Henan Taihong New Material Co ltd
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C21/00—Alloys based on aluminium
    • C22C21/12—Alloys based on aluminium with copper as the next major constituent
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D1/00—Treatment of fused masses in the ladle or the supply runners before casting
    • B22D1/002—Treatment with gases
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D43/00—Mechanical cleaning, e.g. skimming of molten metals
    • 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
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/0081—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for slabs; for billets
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/02—Making non-ferrous alloys by melting
    • C22C1/026—Alloys based on aluminium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/02—Making non-ferrous alloys by melting
    • C22C1/03—Making non-ferrous alloys by melting using master alloys
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C21/00—Alloys based on aluminium
    • C22C21/12—Alloys based on aluminium with copper as the next major constituent
    • C22C21/14—Alloys based on aluminium with copper as the next major constituent with silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C21/00—Alloys based on aluminium
    • C22C21/12—Alloys based on aluminium with copper as the next major constituent
    • C22C21/16—Alloys based on aluminium with copper as the next major constituent with magnesium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C21/00—Alloys based on aluminium
    • C22C21/12—Alloys based on aluminium with copper as the next major constituent
    • C22C21/18—Alloys based on aluminium with copper as the next major constituent with zinc
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
    • C22F1/057—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys with copper as the next major constituent
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries

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Abstract

The invention discloses a charging pile aluminum alloy plate for a new energy vehicle and a preparation method thereof. The aluminum alloy plate contains the following elements and the content of the elements is less than or equal to 0.1 percent of Si, 0.15-0.18 percent of Fe, 0.21-0.23 percent of Cu, less than or equal to 0.01 percent of Mn, less than or equal to 0.01 percent of Mg, less than or equal to 0.01 percent of Cr, less than or equal to 0.01 percent of Zn, 0.01-0.15 percent of Ti, and the balance of Al. Adding raw materials of an aluminum ingot, an Al-Cu75 ingot, a pure magnesium ingot, an Al-Cr75 ingot, a Zn alloy ingot and a 5Ti-1B titanium boron wire into a smelting furnace for smelting, sequentially refining and casting alloy liquid obtained after smelting, and sequentially sawing, milling the surface of the obtained cast ingot, uniformly heating, hot rolling and annealing to obtain the product of the charging pile aluminum alloy plate. The aluminum alloy product for the charging pile, which is high in strength, smooth, free of holes and slag in the interior, high in conductivity and high in stability, is prepared by the method.

Description

Charging pile aluminum alloy plate for new energy vehicle and preparation method thereof
1. The technical field is as follows:
the invention belongs to the technical field of aluminum alloy, and particularly relates to a charging pile aluminum alloy plate for a new energy vehicle and a preparation method thereof.
2. Background art:
under the big background of global energy crisis and serious environmental crisis, china actively promotes the application and development of new energy vehicles, and electric vehicles as green vehicles with wide development prospects can be popularized at an extremely rapid speed in the future and have extremely huge market prospects in the future. The charging pile is used as an important matched infrastructure charging facility necessary for developing the electric automobile, and has very important social benefit and economic benefit.
The charging pile is used as an energy supply device of the electric automobile, is similar to an oiling machine in a gas station, can be installed in parking lots or charging stations of public buildings and residential quarters, and is used for charging various electric automobiles meeting the charging connection standard. The intelligent charging pile is characterized by responding to the call of national energy conservation, environmental protection and green travel, providing two charging modes of slow charging and quick charging for vast users, and being portable, wall-mounted, floor-type and other types of charging piles, comprising an intelligent 7kw alternating-current charging pile and an intelligent 60kw/120kw direct-current integrated charging pile to meet the market demand of rapid, economic and intelligent operation and management in the new energy automobile industry. The quick, efficient, safe and reasonable electricity supply to the power battery is realized, and the electricity purchasing terminal can be used for timing, counting the electricity degree and counting the amount of money for charging; simultaneously, for efficiency and the practicality that improves public charging stake, have a function that fills more.
3. The invention content is as follows:
the technical problem to be solved by the invention is as follows: according to the requirements of rapid development of new energy automobiles on charging piles at present, the invention provides a charging pile aluminum alloy plate for the new energy automobiles and a preparation method thereof. According to the technical scheme, the aluminum alloy for the charging pile, which is high in strength, smooth, free of holes and slag inside and high in conductivity and stability, is prepared through the working procedures of smelting, casting, surface milling, homogenizing heat treatment, heating, hot rough rolling and annealing.
In order to solve the problems, the invention adopts the technical scheme that:
the invention provides a charging pile aluminum alloy plate for a new energy vehicle, which comprises the following elements in percentage by mass: less than or equal to 0.1 percent of Si, 0.15 to 0.18 percent of Fe, 0.21 to 0.23 percent of Cu, less than or equal to 0.01 percent of Mn, less than or equal to 0.01 percent of Mg, less than or equal to 0.01 percent of Cr, less than or equal to 0.01 percent of Zn, 0.01 to 0.15 percent of Ti, and the balance of Al.
In addition, the preparation method of the charging pile aluminum alloy plate for the new energy vehicle is provided, and comprises the following steps:
a. smelting: adding an aluminum ingot with the purity of 99.85 percent, an additive Al-Cu75 with the Cu content of 75 percent by mass, a pure magnesium ingot with the purity of 99.98 percent, an additive Al-Cr75 with the Cr content of 75 percent by mass, a Zn alloy ingot with the purity of 99.98 percent and a 5Ti-1B titanium boron wire into a smelting furnace, heating to 720-760 ℃ and smelting for 4.5-5.5 h; refining is carried out after smelting, smelting is carried out for 0.5-1 h after refining, smelting in the smelting furnace is completed, alloy liquid is obtained, and the obtained alloy liquid meets the content requirements of all elements in the charging pile aluminum alloy plate;
b. refining: b, placing the alloy liquid obtained in the step a into a standing furnace for refining at the temperature of 720-740 ℃ for 30-50 min, removing floating slag after refining, standing for 20-40 min, and finishing smelting in the standing furnace after standing;
c. casting: b, introducing the alloy liquid refined in the step b into a primary filtering device for filtering, introducing the alloy liquid into an online degassing device for online degassing after primary filtering, and then sequentially performing secondary filtering and tertiary filtering to remove aluminum slag with the diameter less than or equal to 0.005 mm; casting the alloy liquid obtained after filtering, controlling the casting temperature to be 695-715 ℃ and the casting time to be 1.5-2.0 h, and obtaining cast ingots after casting;
d. sawing a head and milling a surface: sawing and milling the obtained cast ingot, wherein the length of the saw head is 180mm, the milling amount of the large surface on one side is more than or equal to 15mm, the milling amount of the small surface on one side is more than or equal to 12mm, and the thickness difference of two sides of the cast ingot is less than or equal to 3mm;
e. soaking treatment: carrying out soaking treatment on the cast ingot obtained after surface milling;
f. hot rolling: placing the aluminum alloy subjected to soaking treatment to room temperature, then carrying out soaking treatment on the cast ingot, carrying out hot rough rolling after treatment, and lubricating and cooling by using an emulsion to obtain an aluminum alloy plate;
g. annealing: naturally cooling the obtained aluminum alloy plate to room temperature, then carrying out annealing treatment, discharging from the furnace after treatment, and naturally cooling to obtain the product, namely the charging pile aluminum alloy plate.
According to the preparation method of the charging pile aluminum alloy plate for the new energy vehicle, in the refining process in the step a, a raw material composition is prepared by adopting a raw material formula which is 1:9, refining the nitrogen-chlorine mixed gas at the refining temperature of 720-760 ℃ for 25-35 min.
According to the preparation method of the charging pile aluminum alloy plate for the new energy vehicle, in the refining process in the step b, the raw materials are prepared by the following steps of: 9, refining the nitrogen-chlorine mixed gas.
According to the preparation method of the charging pile aluminum alloy plate for the new energy vehicle, in the step c, the precision of the filter plate of the primary filter device is 50PPi; carrying out on-line degassing on the alloy liquid by adopting high-purity argon with the purity of 99.999 percent, wherein the rotating speed of a graphite rotor during on-line degassing is 440-480 r/min, and the hydrogen content after on-line degassing is less than or equal to 0.15ml/100gAl; the precision of the filter plate of the secondary filtration is 60PPi, and the device adopted by the tertiary filtration is a 22-tube tubular filtration device.
According to the preparation method of the charging pile aluminum alloy plate for the new energy vehicle, in the soaking treatment in the step e, the furnace gas constant temperature is 490 ℃, the furnace temperature reaches 490 ℃, heat preservation is started, the temperature is maintained for 2.5 hours, the furnace gas temperature is changed to 455 ℃ after the heat preservation time is reached, the heat preservation is started when the measured metal temperature reaches 455 ℃, the temperature is maintained for 5 hours, and when the measured metal temperature is stabilized at 450-460 ℃, the aluminum alloy plate is taken out of the furnace and is naturally cooled.
According to the preparation method of the new energy vehicle charging pile aluminum alloy plate, during soaking treatment in the step f, the obtained cast ingot is put into a push type heating furnace, the temperature of furnace gas is set to 450 ℃, the temperature of metal reaches 390-400 ℃, the heat is preserved for 4-8 hours, the temperature of furnace gas is set to 450 ℃, and the temperature of metal reaches 415-425 ℃ before discharging and rolling.
According to the preparation method of the charging pile aluminum alloy plate for the new energy vehicle, in the step f, hot rough rolling is carried out by adopting a 1+1 hot continuous rolling mill, cogging is carried out on the hot rough rolling at the temperature of 415-425 ℃, reversible rolling is carried out on 13-15 passes of rough rolling, the rolling thickness of each pass is 25-50 mm, and the thickness of a rough rolled finished product is 23-50 mm; the finishing temperature after the hot rough rolling is 300-330 ℃;
the emulsion pressure adopted by the hot rough rolling is 0.35-0.45 Mpa, the emulsion temperature during the hot rough rolling is 60-65 ℃, and the mass concentration is 4.0-5.0%.
According to the preparation method of the charging pile aluminum alloy plate for the new energy vehicle, annealing treatment is carried out in the step g by adopting a box type resistance furnace, the constant temperature of furnace gas is 180 ℃, and the temperature of metal reaches 160-170 ℃ and is kept for 180min.
The invention has the following positive beneficial effects:
1. according to the technical scheme, in the casting process, an efficient and convenient degassing and deslagging method is adopted, and degassing and three-stage filtration are performed simultaneously in the casting process, so that the content of hydrogen in the obtained alloy liquid is effectively reduced, the oxidizing slag is completely removed, the content of impurities in aluminum is controlled within 0.005mm, and the internal defects of the aluminum alloy for the charging pile 1070 caused by the generation of holes and pinholes are effectively prevented.
2. The thick aluminum alloy plate for the charging pile prepared by the technical scheme of the invention has no holes and no slag inclusion, the internal flaw detection of the thick plate with the thickness of 22-50 mm reaches A-AA grade, the defects of internal holes, slag inclusion and the like do not exist completely, and the smooth promotion of the aluminum alloy industry for the charging pile can be completely met; the charging pile manufactured by the invention has the advantages of uniform forming relieved teeth, quick, efficient and safe charging, long service life and the like.
3. In the preparation process of the aluminum alloy plate of the charging pile for the new energy vehicle, the segregation of the components of the ingot is effectively eliminated, the internal stress of the ingot is reduced, and the chemical components are uniform through a well-controlled soaking process; the hot rolling adopts 13-15 times of large reduction rolling to completely crush internal grains, so that the internal defects of large grains, loose tissues and the like are eliminated, and finally the obtained thick plate product for the charging pile is improved to a great extent.
4. The performance of 1070 alloy H112 state products prepared by the method is uniform and has great relation with low-temperature stabilization treatment, the annealing by adopting a box type resistance furnace has the advantages of high temperature rise speed, small temperature difference of each area in the furnace, uniform heating of the products and the like, and the annealed products have uniform performance and completely meet the relevant use requirements of the aluminum alloy for the charging pile.
5. The finished product of the aluminum alloy material for the charging pile in the H112 state, which is prepared by the invention, has the advantages of tensile strength of 65-90 Mpa, elongation rate of more than 45%, yield strength of more than 50Mpa, and Babbitt hardness of 35-45, and uniform performance and hardness, and effectively improves the uniformity of a charging pile forming tooth and the stability in a charging process.
4. The specific implementation mode is as follows:
the invention is further illustrated by the following examples, which do not limit the scope of the invention.
Example 1:
the charging pile aluminum alloy plate for the new energy vehicle comprises the following elements in percentage by mass: 0.07% of Si, 0.16% of Fe, 0.22% of Cu, 0.005% of Mn, 0.008% of Mg, 0.008% of Cr, 0.007% of Zn, 0.018% of Ti and the balance of Al.
Example 2:
the charging pile aluminum alloy plate for the new energy vehicle comprises the following elements in percentage by mass: 0.05% of Si, 0.15% of Fe, 0.21% of Cu, 0.008% of Mn, 0.006% of Mg, 0.009% of Cr, 0.008% of Zn, 0.1% of Ti and the balance of Al.
Example 3:
the charging pile aluminum alloy plate for the new energy vehicle comprises the following elements in percentage by mass: 0.06% of Si, 0.17% of Fe, 0.21% of Cu, 0.009% of Mn, 0.007% of Mg, 0.007% of Cr, 0.006% of Zn, 0.08% of Ti and the balance of Al.
Example 4:
the preparation method of the charging pile aluminum alloy plate for the new energy vehicle, disclosed by the embodiment 1 of the invention, comprises the following detailed steps:
a. smelting: adding an aluminum ingot with the purity of 99.85%, an additive Al-Cu75 with the Cu content of 75% by mass, a pure magnesium ingot with the purity of 99.98%, an additive Al-Cr75 with the Cr content of 75% by mass, a Zn alloy ingot with the purity of 99.98% and a 5Ti-1B titanium boron wire into a smelting furnace, and then heating to 740 ℃ for smelting for 5 hours; refining for 30min (refining operation is carried out by adopting nitrogen-chlorine mixed gas with the volume ratio of 1;
b. refining: b, placing the alloy liquid obtained in the step a into a standing furnace for refining, wherein the refining temperature is 730-740 ℃, the refining time is 45min (refining operation is carried out by adopting nitrogen-chlorine mixed gas with the volume ratio of 1;
c. casting: b, introducing the alloy liquid refined in the step b into a primary filtering device for filtering, introducing the alloy liquid into an online degassing device for online degassing after primary filtering, and then sequentially performing secondary filtering and tertiary filtering to remove aluminum slag with the diameter less than or equal to 0.005 mm; casting the alloy liquid obtained after filtering to obtain an ingot with the thickness of 620mm and the width of 1330 mm;
the precision of a filter plate of the primary filter device is 50PPi; carrying out on-line degassing on the alloy liquid by adopting high-purity argon with the purity of 99.999 percent, wherein the rotating speed of a graphite rotor during on-line degassing is 450-460 r/min, and the hydrogen content after on-line degassing is less than or equal to 0.15ml/100gAl; the precision of the filter plate of the secondary filtration is 60PPi, and the device adopted by the tertiary filtration is a 22-tube type filtration device;
in the casting process, the casting temperature is controlled to be 715 ℃, the casting time is 2.0h, the casting water temperature is 30 ℃, and the casting water pressure is 0.6kg/cm 2 The casting speed is 40mm/min, and the casting water flow is 200m 3 /h；
d. Sawing a head and milling a surface: sawing and milling the obtained cast ingot, wherein the length of the saw head is 180mm, the milling amount of the large surface on one side is 15mm, the milling amount of the small surface on one side is 17mm, and the thickness difference of two sides of the cast ingot is less than or equal to 3mm;
e. soaking treatment: carrying out soaking treatment on the cast ingot obtained after surface milling;
during soaking treatment, the furnace gas constant temperature is 490 ℃, the furnace temperature is 490 ℃, heat preservation is started when the furnace temperature reaches 490 ℃, heat preservation is carried out for 2.5 hours, the furnace gas temperature is changed to 455 ℃ after the heat preservation time is reached, heat preservation is started when the measured metal temperature is 455 ℃, heat preservation is carried out for 5 hours, and when the measured metal temperature is stabilized at 450-460 ℃, the furnace is taken out for natural cooling;
f. hot rolling: placing the aluminum alloy subjected to soaking treatment to room temperature, then carrying out soaking treatment on the cast ingot, carrying out hot rough rolling after treatment, and lubricating and cooling by using an emulsion to obtain an aluminum alloy plate;
during soaking treatment, the obtained cast ingot is put into a push type heating furnace, the furnace gas is kept at a constant temperature of 450 ℃, the metal temperature reaches 395 ℃, the temperature is kept for 6 hours, the furnace gas is kept at a constant temperature of 450 ℃, and the metal temperature reaches 420 ℃ before the cast ingot is discharged for rolling;
the hot rolling is carried out by adopting a hot continuous rolling mill of 1+1 for hot rough rolling, the hot rough rolling is cogging at the condition of 420 ℃, the rough rolling is carried out by 14-pass reversible rolling, the pass distribution is 590 → 550 → 510 → 470 → 430 → 380 → 340 → 300 → 260 → 220 → 180 → 140 → 104 → 74 → 46mm, the head cutting and the edge rolling are carried out after the 12 th pass rolling, the thickness of the finished product is sliced, and the specification is 46 x 1296 and 7200mm; the thickness of the rough rolling finished product is 46mm; the finishing temperature after the hot rough rolling is 310 ℃;
the emulsion pressure adopted by the hot rough rolling is 0.40Mpa, the emulsion temperature during the hot rough rolling is 62 ℃, and the mass concentration is 4.5%;
g. annealing: naturally cooling the obtained aluminum alloy plate to room temperature, then carrying out annealing treatment (annealing treatment is carried out by adopting a box type resistance furnace, the constant temperature of furnace gas is 180 ℃, the metal temperature reaches 165 ℃, and keeping the temperature for 180 min), discharging the aluminum alloy plate out of the furnace after treatment, and naturally cooling to obtain the product of the charging pile aluminum alloy plate.
Example 5:
the preparation method of the charging pile aluminum alloy plate for the new energy vehicle, provided by the embodiment 2, comprises the following detailed steps:
a. smelting: adding an aluminum ingot with the purity of 99.85 percent, an additive Al-Cu75 with the Cu content of 75 percent by mass, a pure magnesium ingot with the purity of 99.98 percent, an additive Al-Cr75 with the Cr content of 75 percent by mass, a Zn alloy ingot with the purity of 99.98 percent and a 5Ti-1B titanium boron wire into a smelting furnace, and then heating to 740 ℃ for smelting for 5 hours; refining for 30min (refining by adopting nitrogen-chlorine mixed gas with the volume ratio of 1 to 9) at the temperature condition after smelting, continuously smelting for 0.5h after refining, finishing the smelting in the smelting furnace, and obtaining alloy liquid, wherein the obtained alloy liquid meets the content requirements of all elements in the charging pile aluminum alloy plate in the embodiment 2;
b. refining: b, placing the alloy liquid obtained in the step a into a standing furnace for refining, wherein the refining temperature is 730-740 ℃, the refining time is 45min (refining operation is carried out by adopting nitrogen-chlorine mixed gas with the volume ratio of 1;
c. casting: b, introducing the alloy liquid refined in the step b into a primary filtering device for filtering, introducing the alloy liquid into an online degassing device for online degassing after primary filtering, and then sequentially performing secondary filtering and tertiary filtering to remove aluminum slag with the diameter less than or equal to 0.005 mm; casting the alloy liquid obtained after filtering to obtain a cast ingot with the thickness of 620mm and the width of 1330 mm;
the precision of a filter plate of the primary filter device is 50PPi; carrying out on-line degassing on the alloy liquid by adopting high-purity argon with the purity of 99.999 percent, wherein the rotating speed of a graphite rotor during on-line degassing is 450-460 r/min, and the hydrogen content after on-line degassing is less than or equal to 0.15ml/100gAl; the precision of the filter plate of the secondary filtration is 60PPi, and the device adopted by the tertiary filtration is a 22-tube type filtration device;
in the casting process, the casting temperature is controlled to be 710 ℃, the casting time is 1.8h, the casting water temperature is 30 ℃, and the casting water pressure is 0.6kg/cm 2 The casting speed is 40mm/min, and the casting water flow is 200m 3 /h；
d. Sawing a head and milling a surface: sawing and milling the obtained cast ingot, wherein the length of the saw head is 180mm, the milling amount of the large surface on one side is 15mm, the milling amount of the small surface on one side is 17mm, and the thickness difference of the two sides of the cast ingot is less than or equal to 3mm;
e. soaking treatment: carrying out soaking treatment on the cast ingot after surface milling;
during soaking treatment, the furnace gas constant temperature is 490 ℃, the hearth temperature is 490 ℃, heat preservation is started when the hearth temperature reaches 490 ℃, the heat preservation is carried out for 2.5 hours, the furnace gas temperature is 455 ℃ after the heat preservation time is reached, the heat preservation is started when the measured metal temperature reaches 455 ℃, the heat preservation is carried out for 5 hours, and when the measured metal temperature is stabilized at 450-460 ℃, the furnace is taken out for natural cooling;
f. hot rolling: placing the aluminum alloy subjected to soaking treatment to room temperature, then carrying out soaking treatment on the cast ingot, carrying out hot rough rolling after treatment, and lubricating and cooling by using an emulsion to obtain an aluminum alloy plate;
during soaking treatment, the obtained cast ingot is put into a push type heating furnace, the furnace gas temperature is set to 450 ℃, the metal temperature reaches 395 ℃, the temperature is kept for 6 hours, the furnace gas temperature is set to 450 ℃, and the metal temperature reaches 420 ℃, and then the cast ingot is taken out of the furnace for rolling;
the hot rolling is carried out by adopting a 1+1 hot continuous rolling mill for hot rough rolling, the hot rough rolling is cogging at the temperature of 420 ℃, 15 passes of rough rolling are distributed, the reversible rolling passes are distributed into 590 → 550 → 510 → 470 → 430 → 380 → 340 → 300 → 260 → 220 → 147 → 112 → 82 → 52 → 22mm, the head cutting and the edge rolling are carried out after the 12 th rolling, and the thickness of a finished product is sliced, wherein the specification is 46 × 1296 × 7200mm; the thickness of the rough rolling finished product is 22mm; the finishing temperature after the hot rough rolling is 320 ℃;
the emulsion pressure adopted by the hot rough rolling is 0.40Mpa, the emulsion temperature during the hot rough rolling is 62 ℃, and the mass concentration is 4.5%;
g. annealing: naturally cooling the obtained aluminum alloy plate to room temperature, then carrying out annealing treatment (annealing treatment is carried out by adopting a box type resistance furnace, the constant temperature of furnace gas is 180 ℃, the metal temperature reaches 160 ℃, and the temperature is kept for 180 min), discharging the aluminum alloy plate out of the furnace after treatment, and naturally cooling to obtain the product of the charging pile aluminum alloy plate.
Example 6:
the preparation method of the charging pile aluminum alloy plate for the new energy vehicle, provided by the embodiment 3, comprises the following detailed steps:
a. smelting: adding an aluminum ingot with the purity of 99.85 percent, an additive Al-Cu75 with the Cu content of 75 percent by mass, a pure magnesium ingot with the purity of 99.98 percent, an additive Al-Cr75 with the Cr content of 75 percent by mass, a Zn alloy ingot with the purity of 99.98 percent and a 5Ti-1B titanium boron wire into a smelting furnace, and then heating to 740 ℃ for smelting for 5 hours; refining for 30min (refining by adopting nitrogen-chlorine mixed gas with the volume ratio of 1 to 9) at the temperature condition after smelting, continuously smelting for 0.5h after refining, finishing the smelting in the smelting furnace, and obtaining alloy liquid, wherein the obtained alloy liquid meets the content requirements of all elements in the charging pile aluminum alloy plate in the embodiment 3;
b. refining: b, placing the alloy liquid obtained in the step a into a standing furnace for refining, wherein the refining temperature is 730-740 ℃, the refining time is 45min (refining operation is carried out by adopting nitrogen-chlorine mixed gas with the volume ratio of 1;
c. casting: b, introducing the alloy liquid refined in the step b into a primary filtering device for filtering, introducing the alloy liquid into an online degassing device for online degassing after primary filtering, and then sequentially performing secondary filtering and tertiary filtering to remove aluminum slag with the diameter less than or equal to 0.005 mm; casting the alloy liquid obtained after filtering to obtain an ingot with the thickness of 620mm and the width of 1330 mm;
the precision of a filter plate of the primary filter device is 50PPi; carrying out on-line degassing on the alloy liquid by adopting high-purity argon with the purity of 99.999 percent, wherein the rotating speed of a graphite rotor is 450-460 r/min during on-line degassing, and the hydrogen content after on-line degassing is less than or equal to 0.15ml/100gAl; the precision of a filter plate of the secondary filtration is 60PPi, and a device adopted by the tertiary filtration is a 22-pipe tubular filtration device;
in the casting process, the casting temperature is controlled to be 700 ℃, the casting time is 1.5h, the casting water temperature is 30 ℃, and the casting water pressure is 0.6kg/cm 2 The casting speed is 40mm/min, and the casting water flow is 200m 3 /h；
d. Sawing a head and milling a surface: sawing and milling the obtained cast ingot, wherein the length of the saw head is 180mm, the milling amount of the large surface on one side is 15mm, the milling amount of the small surface on one side is 17mm, and the thickness difference of two sides of the cast ingot is less than or equal to 3mm;
e. soaking treatment: carrying out soaking treatment on the cast ingot after surface milling;
during soaking treatment, the furnace gas constant temperature is 490 ℃, the furnace temperature is 490 ℃, heat preservation is started when the furnace temperature reaches 490 ℃, heat preservation is carried out for 2.5 hours, the furnace gas temperature is changed to 455 ℃ after the heat preservation time is reached, heat preservation is started when the measured metal temperature is 455 ℃, heat preservation is carried out for 5 hours, and when the measured metal temperature is stabilized at 450-460 ℃, the furnace is taken out for natural cooling;
f. hot rolling: placing the aluminum alloy subjected to soaking treatment to room temperature, then carrying out soaking treatment on the cast ingot, carrying out hot rough rolling after treatment, and lubricating and cooling by using an emulsion to obtain an aluminum alloy plate;
during soaking treatment, the obtained cast ingot is put into a push type heating furnace, the furnace gas is kept at a constant temperature of 450 ℃, the metal temperature reaches 395 ℃, the temperature is kept for 6 hours, the furnace gas is kept at a constant temperature of 450 ℃, and the metal temperature reaches 420 ℃ before the cast ingot is discharged for rolling;
the hot rolling is carried out by adopting a hot continuous rolling mill 1+1 for hot rough rolling, the hot rough rolling is cogging at the temperature of 420 ℃, 15 passes of rough rolling are distributed, the reversible rolling pass is distributed into 590 → 550 → 510 → 470 → 430 → 380 → 340 → 300 → 260 → 220 → 182 → 147 → 112 → 82 → 52 → 32mm, the head cutting and edge rolling are carried out after the 12 th pass of rolling, and the thickness of a finished product is sliced, wherein the specification is 46 x 1296 x 7200mm; the thickness of the rough rolling finished product is 32mm; the finishing temperature after the hot rough rolling is 315 ℃;
the emulsion pressure adopted by the hot rough rolling is 0.40Mpa, the emulsion temperature during the hot rough rolling is 62 ℃, and the mass concentration is 4.5%;
g. and (3) annealing: naturally cooling the obtained aluminum alloy plate to room temperature, then carrying out annealing treatment (annealing treatment is carried out by adopting a box type resistance furnace, the constant temperature of furnace gas is 180 ℃, the metal temperature reaches 170 ℃, and heat preservation is carried out for 180 min), discharging the aluminum alloy plate after treatment, and naturally cooling to obtain the product of the charging pile aluminum alloy plate.
The data of the relevant performance tests of the products prepared in the above-mentioned examples of the invention are detailed in table 1.
TABLE 1 relevant Performance test data for products prepared in accordance with the examples of the present invention
Figure BDA0003425879860000121

Claims (3)

1. The preparation method of the charging pile aluminum alloy plate for the new energy vehicle is characterized in that the charging pile aluminum alloy plate comprises the following elements in percentage by mass: less than or equal to 0.1 percent of Si, 0.15 to 0.18 percent of Fe, 0.21 to 0.23 percent of Cu, less than or equal to 0.01 percent of Mn, less than or equal to 0.01 percent of Mg, less than or equal to 0.01 percent of Cr, less than or equal to 0.01 percent of Zn, 0.01 to 0.15 percent of Ti, and the balance of Al;
the preparation method comprises the following steps:
a. smelting: adding an aluminum ingot with the purity of 99.85 percent, an additive Al-Cu75 with the Cu content of 75 percent by mass, a pure magnesium ingot with the purity of 99.98 percent, an additive Al-Cr75 with the Cr content of 75 percent by mass, a Zn alloy ingot with the purity of 99.98 percent and a 5Ti-1B titanium boron wire into a smelting furnace, heating to 720-760 ℃ and smelting for 4.5-5.5 h; refining is carried out after smelting, smelting is carried out for 0.5-1 h after refining, smelting in the smelting furnace is completed, alloy liquid is obtained, and the obtained alloy liquid meets the content requirements of all elements in the charging pile aluminum alloy plate;
b. refining: b, placing the alloy liquid obtained in the step a into a standing furnace for refining at the temperature of 720-740 ℃ for 30-50 min, removing floating slag after refining, standing for 20-40 min, and finishing smelting in the standing furnace after standing;
c. casting: b, introducing the alloy liquid refined in the step b into a primary filtering device for filtering, introducing the alloy liquid into an online degassing device for online degassing after primary filtering, and then sequentially performing secondary filtering and tertiary filtering to remove aluminum slag with the diameter less than or equal to 0.005 mm; casting the alloy liquid obtained after filtering, controlling the casting temperature to be 695-715 ℃ and the casting time to be 1.5-2.0 h, and obtaining cast ingots after casting;
the precision of a filter plate of the primary filter device is 50PPi; carrying out on-line degassing on the alloy liquid by adopting high-purity argon with the purity of 99.999 percent, wherein the rotating speed of a graphite rotor during on-line degassing is 440-480 r/min, and the hydrogen content after on-line degassing is less than or equal to 0.15ml/100gAl; the precision of a filter plate of the secondary filtration is 60PPi, and a device adopted by the tertiary filtration is a 22-pipe tubular filtration device;
d. sawing a head and milling a surface: sawing and milling the obtained cast ingot, wherein the length of the saw head is 180mm, the milling amount of the large surface on one side is more than or equal to 15mm, the milling amount of the small surface on one side is more than or equal to 12mm, and the thickness difference of two sides of the cast ingot is less than or equal to 3mm;
e. soaking treatment: carrying out soaking treatment on the cast ingot after surface milling;
during soaking treatment, the furnace gas constant temperature is 490 ℃, the hearth temperature is 490 ℃, heat preservation is started when the hearth temperature reaches 490 ℃, the heat preservation is carried out for 2.5 hours, the furnace gas temperature is 455 ℃ after the heat preservation time is reached, the heat preservation is started when the measured metal temperature reaches 455 ℃, the heat preservation is carried out for 5 hours, and when the measured metal temperature is stabilized at 450-460 ℃, the furnace is taken out for natural cooling;
f. hot rolling: placing the aluminum alloy subjected to soaking treatment to room temperature, then carrying out soaking treatment on the cast ingot, carrying out hot rough rolling after treatment, and lubricating and cooling by using an emulsion to obtain an aluminum alloy plate;
during soaking treatment, the obtained cast ingot is put into a push type heating furnace, the temperature of furnace gas is set to 450 ℃, the metal temperature reaches 390-400 ℃, the temperature is kept for 4-8 h, the temperature of furnace gas is set to 450 ℃, and the metal temperature reaches 415-425 ℃ before discharging and rolling;
the hot rolling is carried out by adopting a hot continuous rolling mill 1+1 for hot rough rolling, the hot rough rolling is cogging at the temperature of 415-425 ℃, the rough rolling is carried out by 13-15 passes of reversible rolling, the rolling thickness of each pass is 25-50 mm, and the thickness of a rough rolling finished product is 23-50 mm; the finishing temperature after the hot rough rolling is 300-330 ℃; the emulsion pressure adopted by the hot rough rolling is 0.35-0.45 Mpa, the emulsion temperature during the hot rough rolling is 60-65 ℃, and the mass concentration is 4.0-5.0%;
g. annealing: naturally cooling the obtained aluminum alloy plate to room temperature, then carrying out annealing treatment, discharging the treated aluminum alloy plate out of the furnace, and naturally cooling to obtain the product charging pile aluminum alloy plate;
annealing treatment is carried out by adopting a box type resistance furnace, the constant temperature of furnace gas is 180 ℃, and the temperature of metal reaches 160-170 ℃ and is kept for 180min.
2. The preparation method of the charging pile aluminum alloy plate for the new energy vehicle as claimed in claim 1, wherein the charging pile aluminum alloy plate comprises the following steps: in the refining process of the step a, the volume ratio of 1:9, refining the nitrogen-chlorine mixed gas at the refining temperature of 720-760 ℃ for 25-35 min.
3. The preparation method of the charging pile aluminum alloy plate for the new energy vehicle as claimed in claim 1, wherein the charging pile aluminum alloy plate comprises the following steps: in the refining process of the step b, the volume ratio of 1:9, refining the nitrogen-chlorine mixed gas.
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