CN109988948B - 5182-O state aluminum alloy plate for automobile inner plate and production method thereof - Google Patents
5182-O state aluminum alloy plate for automobile inner plate and production method thereof Download PDFInfo
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- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 45
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 18
- 238000000137 annealing Methods 0.000 claims abstract description 74
- 239000000463 material Substances 0.000 claims abstract description 38
- 238000010438 heat treatment Methods 0.000 claims abstract description 23
- 238000005266 casting Methods 0.000 claims abstract description 22
- 238000005097 cold rolling Methods 0.000 claims abstract description 22
- 238000005098 hot rolling Methods 0.000 claims abstract description 20
- 238000003723 Smelting Methods 0.000 claims abstract description 15
- 239000002994 raw material Substances 0.000 claims abstract description 13
- 238000005520 cutting process Methods 0.000 claims abstract description 9
- 238000004140 cleaning Methods 0.000 claims abstract description 7
- 238000000265 homogenisation Methods 0.000 claims abstract description 7
- 238000005452 bending Methods 0.000 claims abstract description 6
- 238000003754 machining Methods 0.000 claims abstract description 6
- 238000003801 milling Methods 0.000 claims abstract description 6
- 238000000034 method Methods 0.000 claims description 11
- 239000010731 rolling oil Substances 0.000 claims description 10
- 229910052751 metal Inorganic materials 0.000 claims description 6
- 239000002184 metal Substances 0.000 claims description 6
- 238000005096 rolling process Methods 0.000 claims description 6
- 238000009958 sewing Methods 0.000 claims description 6
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 5
- 238000009749 continuous casting Methods 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 5
- 238000007872 degassing Methods 0.000 claims description 5
- 238000001914 filtration Methods 0.000 claims description 5
- 239000001257 hydrogen Substances 0.000 claims description 5
- 229910052739 hydrogen Inorganic materials 0.000 claims description 5
- 239000003921 oil Substances 0.000 claims description 5
- 238000007670 refining Methods 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 238000001035 drying Methods 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 3
- 238000002791 soaking Methods 0.000 claims description 2
- 238000012545 processing Methods 0.000 abstract description 2
- 239000000956 alloy Substances 0.000 description 8
- 229910052782 aluminium Inorganic materials 0.000 description 8
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 8
- 229910045601 alloy Inorganic materials 0.000 description 7
- 230000007547 defect Effects 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 238000007796 conventional method Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000004744 fabric Substances 0.000 description 3
- 238000004804 winding Methods 0.000 description 3
- 239000013078 crystal Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
-
- 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
- C22C1/06—Making non-ferrous alloys with the use of special agents for refining or deoxidising
-
- 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
- C22C21/06—Alloys based on aluminium with magnesium as the next major constituent
- C22C21/08—Alloys based on aluminium with magnesium as the next major constituent with silicon
-
- 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
- C22F1/047—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 magnesium as the next major constituent
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
- B21B2003/001—Aluminium or its alloys
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- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
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- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
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- Heat Treatment Of Steel (AREA)
Abstract
The invention relates to a 5182-O state aluminum alloy plate for an automobile inner plate, which is composed of the following raw materials in percentage by weight: 0.1-0.15% of Si, 0.15-0.3% of Fe, less than or equal to 0.03% of Cu, 0.2-0.4% of Mn, 4.5-4.9% of Mg4, 0.03-0.07% of Cr0, less than or equal to 0.1% of Zn, 0.015-0.04% of Ti and the balance of Al. The production method comprises the following steps: preparing materials; smelting and casting; carrying out homogenization heat treatment on the cast ingot, and machining and milling the surface; hot rolling; cold rolling; continuously and completely annealing the finished product, wherein the temperature in the annealing furnace is 420-480 ℃, and the speed of the aluminum alloy strip in the annealing furnace is 10-20 m/min; stretch bending, straightening, cleaning and stretch straightening plate shape; and (6) cutting into slices by flying shear. The 5182-O state aluminum alloy plate has the advantages of stable performance, uniform internal structure, good processing plasticity, no orange peel lines after stamping and higher strength.
Description
Technical Field
The invention relates to the field of metal manufacturing, in particular to a 5182-O state aluminum alloy plate for an automobile inner plate and a production method thereof.
Background
The conventional automobile materials are mostly processed by deep drawing steel sheets, and the degree of aluminum alloying of automobile parts is increasing with the development of automobile lightweight technology in recent years. Taking a plate as an example, the application of the aluminum alloy plate in the automobile is mainly divided into an automobile outer plate and an automobile inner plate. As the automobile industry pays more and more attention to the attractive appearance and smooth lines of the automobile body, the attractive appearance and the smooth lines are realized by stamping, and thus, the automobile body has extremely high requirements on the forming performance of materials. In the case of the outer and inner panels of the automobile, the strength and rigidity of the member are mainly provided by the inner panel. The traditional method is to increase the thickness of the inner plate, but the design can increase the weight of the component, so as to increase the weight of the whole vehicle, the increase of the weight of the whole vehicle has negative influence on the power performance and the fuel economy of the whole vehicle, and the concept of vehicle manufacturing with energy conservation and environmental protection is violated, so the method of increasing the thickness is not preferable. Therefore, it is required to manufacture an aluminum alloy thin plate material with good formability, high strength and thin thickness to replace the traditional deep drawing steel plate.
The search of the prior art shows that the aluminum alloy inner plate for the automobile is mainly made of 5xxx series alloy, such as 5052 alloy, 5182 alloy and the like. In terms of two indexes of deep drawing performance and tensile strength, 5052 aluminum alloy is far less good than 5182 alloy, so that the preferred aluminum alloy material for the deep drawing inner plate of the complex automobile is 5182-O state thin plate.
The 5182-O state plate is a state of the material after complete annealing, the complete annealing in the ordinary 5182-O state is mostly traditional cover annealing, and the annealing mode has the main defects of low heating speed, limited crystal grain uniformity and fineness degree, poor surface quality after annealing, easy occurrence of orange peel defect especially during stamping and difficulty in meeting the requirements of high surface, high performance and high stability of an automobile covering part on a stamped sheet.
The Chinese invention patent (publication No. 104862551A) discloses a 5-series aluminum alloy for an automobile inner panel, which comprises the following chemical components in percentage by mass: 4.0 to 6.0 wt% of Mg, 0.30 to 1.0 wt% of Cu, 1.0 to 3.5 wt% of Zn, less than or equal to 0.4 wt% of Mn, less than or equal to 0.4 wt% of Fe, less than or equal to 0.4 wt% of Si, less than or equal to 0.2 wt% of Cr, less than or equal to 0.1 wt% of Ti, and the balance of Al and inevitable impurities. The alloy is based on A5182 and A5023 alloys, and can meet the baking finish hardenability and dent resistance of aluminum alloy automobile plates by increasing the content of Cu and Zn in the alloy and introducing pre-aging treatment.
Disclosure of Invention
In order to solve the problems of limited uniform and fine degree of crystal grains, poor surface quality after annealing and high orange peel tendency during stamping caused by the traditional annealing mode, the invention provides the 5182-O state aluminum alloy sheet which has stable performance, uniform internal structure, good processing plasticity, no orange peel lines after stamping and high strength and is suitable for stamping the inner plate of the automobile covering part.
The invention provides the following technical scheme:
the invention provides a 5182-O state aluminum alloy plate for an automobile inner plate, which is composed of the following raw materials in percentage by weight: 0.1-0.15% of Si, 0.15-0.3% of Fe, less than or equal to 0.03% of Cu, 0.2-0.4% of Mn, 4.5-4.9% of Mg4, 0.03-0.07% of Cr0, less than or equal to 0.1% of Zn, 0.015-0.04% of Ti and the balance of Al.
Preferably, the material consists of the following raw materials in percentage by weight: 0.12-0.128% of Si, 0.174-0.252% of Fe, 0.013-0.015% of Cu, 0.247-0.272% of Mn, 0.037-0.042% of Mg 4.570-4.831%, 0.037-0.042% of Cr, 0.023-0.025% of Zn, 0.024-0.031% of Ti, and the balance of Al.
The invention also provides a production method of the 5182-O state aluminum alloy plate for the automobile inner plate, which comprises the following steps:
step 1: preparing materials according to the composition of the raw materials;
step 2: smelting and casting: smelting and semi-continuously casting the raw materials in the step 1 to obtain an ingot of 550-630 mm;
and step 3: carrying out homogenization heat treatment on the cast ingot, and machining and milling the surface;
and 4, step 4: hot rolling: hot rolling the cast ingot to a hot rolled blank with the thickness of 6.0-7.0 mm, wherein the final rolling temperature is 300-340 ℃;
and 5: cold rolling: cold rolling the hot rolled blank to the thickness of 0.7-1.5 mm of the finished product;
step 6: and (3) continuous complete annealing of a finished product: carrying out rapid annealing on a finished product obtained by cold rolling in a continuous annealing line, wherein the temperature in the annealing furnace of the continuous annealing line is set to be 420-480 ℃, and the speed of an aluminum alloy strip in the annealing furnace is set to be 10-20 m/min;
and 7: performing stretch bending, straightening and cleaning, and performing stretch straightening on the plate shape, wherein the flatness of the plate shape of the coiled material is less than or equal to 10I;
and 8: and (5) cutting into slices by flying shears, wherein the flatness of the plate is required to be less than or equal to 1 mm/m.
Preferably, the smelting and casting operations in step 2 are as follows:
smelting the mixed metal at 700-750 ℃ for 5-8 hours, standing for refining, degassing, adding a grain refiner Al-5Ti-1B wire, filtering, and measuring the hydrogen content in a launder to be less than or equal to 0.12mL/100 gAL; then casting by a semi-continuous casting method at the temperature of 700-730 ℃, wherein the casting speed is 45-55 mm/min.
Preferably, the temperature of the ingot homogenizing heat treatment in the step 3 is 500-520 ℃, and the heat preservation time of ingot soaking is 12-24 hours.
Preferably, the hot rolling in step 4 is specifically performed by:
heating the cast ingot to 480-510 ℃, preserving heat for more than 3 hours, and hot rolling the cast ingot in a 1+1 type hot rolling mill group to obtain a hot rolled blank with the thickness of 6.0-7.0 mm, wherein the final rolling temperature is 300-340 ℃.
Preferably, in the cold rolling in the step 5, the cold rolling reduction rate of each pass is 20-40%, the refractive index of cold rolling oil is controlled to be more than 90%, and the kinematic viscosity value at 40 ℃ is 2.2-2.4 mm2And/s, the oil temperature of rolling oil is controlled between 35 ℃ and 45 ℃, and the roughness of the roller is controlled to Ra0.3-0.4 mu m.
Preferably, the continuous complete annealing of the finished product comprises the following specific operations:
firstly, uncoiling a coiled material which is rolled to a required thickness on a continuous annealing line, then sewing a head of the coiled material with a tail of the previous coiled material, enabling the cleaned aluminum alloy strip to pass through an annealing furnace of the continuous annealing line at a preset speed of 10-20 m/min, enabling the annealed strip to come out of the continuous annealing line, cooling by water, drying, straightening by a 17-roll straightening machine, and finally coiling.
The invention has the beneficial effects that:
(1) the invention provides a 5182-O state aluminum alloy sheet with the thickness of 0.7-1.5 mm for an automobile covering part stamping inner plate. The invention optimizes the composition of the raw materials for the 5182-O state aluminum alloy sheet material, so that the final material performance index can meet the top-grade sheet material standard in the aluminum alloy sheet material, such as: the tensile strength of the material reaches more than 270MPa, the yield strength is between 120 and 150MPa, the elongation at break A50 percent reaches 26 to 28 percent, the tensile strain hardening index n value can reach between 0.26 and 0.32, the tensile plastic strain ratio r value reaches more than 0.65, the punched surface is uniform and fine, and the requirements of high surface, high performance and high stability of an automobile covering part can be met.
(2) The 5182-O state aluminum alloy sheet is obtained by high-temperature rapid annealing through a continuous annealing production line. The continuous annealing line is manufactured by medium color science and technology, Inc. The temperature in the annealing furnace is uniform, the maximum temperature difference is less than 3 ℃, the heating in the annealing furnace is carried out by high-temperature high-pressure circulating hot air, and a plurality of temperature measuring points are arranged in the annealing furnace, so that the rapid heating and annealing of the aluminum alloy strip can be accurately realized. The temperature setting in the annealing furnace and the running speed of the strip are main factors for determining the rapid annealing of the strip in the annealing furnace, the temperature in the annealing furnace is set between 420 and 480 ℃, the speed of a5182 cold-hard aluminum strip with the thickness of 0.7 to 1.5mm in the annealing furnace is between 10 and 20m/min, and a5182 aluminum alloy sheet material is rapidly heated to realize complete recrystallization annealing and achieve the mechanical property of the softest state. Compared with the traditional cover annealing, the continuous annealing mode has the advantages that the heating speed is higher by more than 2.5 times, the strip is quickly and uniformly heated in the annealing furnace, fine and uniform fine grain structures can be obtained, the strip is ensured to have higher corrosion resistance and mechanical property and good isotropy and formability, and the product performance is stable, so that the orange peel defect during stamping can be effectively eliminated, and the possibility of stamping wrinkling is reduced.
(3) The whole heat treatment process can be continuously carried out, the treatment time is short, the production efficiency is high, and the automation degree is high.
Detailed Description
The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention. Unless otherwise specified, the technical means used in the examples are conventional means well known to those skilled in the art.
The continuous annealing line used in the examples was produced by the medium-color science and technology co, and was, in order from the unwinding side, an unwinder → five-roll rough correction → hydraulic shear → a sewing machine → a cleaning device → a drying device → a continuous annealing furnace → a quenching device → drying → a straightener → an edge trimmer → a paper feeding device → a coiler. The length of the continuous annealing furnace is 32m, the motor power of the uncoiler is 75KW, the straightening machine is 17 rollers, the diameter is 100mm, the motor power of the coiling machine is 75KW, the continuous annealing furnace is heated by natural gas, the heating speed is extremely high, the furnace temperature is stable, the temperature is uniform, the maximum temperature difference is less than 3 ℃, the furnace heating is carried out by high-temperature high-pressure circulating hot air, a plurality of temperature measuring points are arranged in the furnace, and the aluminum alloy strip can be accurately heated.
Example 1
A production method of a 5182-O state aluminum alloy plate for an automobile inner plate comprises the following steps:
step 1: preparing materials:
the raw materials are mixed according to the following weight percentage: 0.128% of Si, 0.174% of Fe, 0.013% of Cu, 0.247% of Mn, 0.025% of Mg 4.570%, 0.037% of Cr, 0.025% of Zn, 0.024% of Ti and the balance of Al.
Step 2: smelting and casting:
smelting the mixed metal at 700-750 ℃ for 5-8 hours, standing and refining according to the conventional method, degassing, adding a grain refiner Al-5Ti-1B wire, filtering, and measuring the hydrogen content in a launder to be less than or equal to 0.12mL/100 gAL; and then casting by a semi-continuous casting method at the temperature of 700-730 ℃, wherein the casting speed is 45-55 mm/min, and the size of the cast ingot is determined according to the actual width of the product.
And step 3: homogenizing heat treatment:
carrying out homogenization heat treatment on the cast ingot at 500-520 ℃ for 12-14 hours, cooling, then carrying out machining, and cutting the head, tail and milling the surface.
And 4, step 4: hot rolling:
heating the cast ingot to 480-510 ℃, preserving heat for more than 3 hours, and hot rolling the cast ingot in a 1+1 type hot rolling mill group to form a hot rolled blank with the thickness of 6.0-7.0 mm, wherein the final rolling temperature is 300-340 ℃.
And 5: cold rolling:
the hot rolled blank is cold rolled to the thickness of a finished product of 0.7-1.5 mm, the cold rolling reduction rate of each pass is 20-40%, the refractive index of cold rolling oil is controlled to be more than 90%, and the kinematic viscosity at 40 ℃ is 2.2-2.4 mm2And/s, controlling the oil temperature of the rolling oil to be between 35 and 45 ℃. The roughness of the roller is controlled to Ra0.3-0.4 μm. The surface of the aluminum coil is not allowed to have obvious surface defects with hand feeling, such as scratches, marks and the like, bright strips are not allowed, color difference is caused, and the aluminum coil is required to be tightened by a steel belt to prevent a loose layer.
Step 6: and (3) continuous complete annealing of a finished product:
the work in process sheet, which has been rolled to final thickness, is annealed on a 1850mm continuous annealing line.
The core of the invention is to produce the 5182-O-state automobile stamping plate with the thickness of 0.7-1.5 mm, and the parameter setting of the continuous annealing mode is a key control point of the whole product and plays a decisive role in the surface and the performance of the product.
Firstly, uncoiling a coiled material which is rolled to a required thickness on a continuous annealing line, then sewing a head of the coiled material with a tail of the previous coiled material, and enabling the cleaned aluminum alloy strip to pass through the continuous annealing line at a preset speed of 10-20 m/min, wherein the temperature in the annealing line of the continuous annealing line is set to be 420-480 ℃.
The annealed strip comes out from the continuous annealing line, is properly cooled by water, dried and then enters a 17-roll straightener to be straightened, so that the 5182 aluminum alloy thin plate strip obtains better flatness. Finally, the fabric is formed by winding.
And 7: bending, straightening, cleaning and plate pulling: the plate shape straightness of the coiled material is less than or equal to 10I.
And 8: cutting into slices by flying shear: the plate flatness requirement is less than or equal to 1 mm/m.
Example 2
A production method of a 5182-O state aluminum alloy plate for an automobile inner plate comprises the following steps:
step 1: preparing materials:
the raw materials are mixed according to the following weight percentage: 0.120% of Si, 0.205% of Fe, 0.015% of Cu, 0.252% of Mn, 4.623% of Mg, 0.038% of Cr, 0.023% of Zn, 0.027% of Ti and the balance of Al.
Step 2: smelting and casting:
smelting the mixed metal at 700-750 ℃ for 5-8 hours, standing and refining according to the conventional method, degassing, adding a grain refiner Al-5Ti-1B wire, filtering, and measuring the hydrogen content in a launder to be less than or equal to 0.12mL/100 gAL; and then casting by a semi-continuous casting method at the temperature of 700-730 ℃, wherein the casting speed is 45-55 mm/min, and the size of the cast ingot is determined according to the actual width of the product.
And step 3: homogenizing heat treatment:
carrying out homogenization heat treatment on the cast ingot at 500-520 ℃ for 12-14 hours, cooling, then carrying out machining, and cutting the head, tail and milling the surface.
And 4, step 4: hot rolling:
heating the cast ingot to 480-510 ℃, preserving heat for more than 3 hours, and hot rolling the cast ingot in a 1+1 type hot rolling mill group to form a hot rolled blank with the thickness of 6.0-7.0 mm, wherein the final rolling temperature is 300-340 ℃.
And 5: cold rolling:
the hot rolled blank is cold rolled to the thickness of a finished product of 0.7-1.5 mm, the cold rolling reduction rate of each pass is 20-40%, the refractive index of cold rolling oil is controlled to be more than 90%, and the kinematic viscosity at 40 ℃ is 2.2-2.4 mm2And/s, controlling the oil temperature of the rolling oil to be between 35 and 45 ℃. The roughness of the roller is controlled to Ra0.3-0.4 μm. The surface of the aluminum coil is not allowed to have obvious surface defects with hand feeling, such as scratches, marks and the like, bright strips are not allowed, color difference is caused, and the aluminum coil is required to be tightened by a steel belt to prevent a loose layer.
Step 6: and (3) continuous complete annealing of a finished product:
the work in process sheet, which has been rolled to final thickness, is annealed on a 1850mm continuous annealing line.
Firstly, uncoiling a coiled material which is rolled to a required thickness on a continuous annealing line, then sewing a head of the coiled material with a tail of the previous coiled material, and enabling the cleaned aluminum alloy strip to pass through the continuous annealing line at a preset speed of 10-20 m/min, wherein the temperature in the annealing line of the continuous annealing line is set to be 420-480 ℃.
The annealed strip comes out from the continuous annealing line, is properly cooled by water, dried and then enters a 17-roll straightener to be straightened, so that the 5182 aluminum alloy thin plate strip obtains better flatness. Finally, the fabric is formed by winding.
And 7: bending, straightening, cleaning and plate pulling: the plate shape straightness of the coiled material is less than or equal to 10I.
And 8: cutting into slices by flying shear: the plate flatness requirement is less than or equal to 1 mm/m.
Example 3
The raw materials are mixed according to the following weight percentage: 0.142% of Si, 0.252% of Fe, 0.015% of Cu, 0.272% of Mn, 4.831% of Mg, 0.042% of Cr, 0.024% of Zn, 0.031% of Ti and the balance of Al.
Step 2: smelting and casting:
smelting the mixed metal at 700-750 ℃ for 5-8 hours, standing and refining according to the conventional method, degassing, adding a grain refiner Al-5Ti-1B wire, filtering, and measuring the hydrogen content in a launder to be less than or equal to 0.12mL/100 gAL; and then casting by a semi-continuous casting method at the temperature of 700-730 ℃, wherein the casting speed is 45-55 mm/min, and the size of the cast ingot is determined according to the actual width of the product.
And step 3: homogenizing heat treatment:
carrying out homogenization heat treatment on the cast ingot at 500-520 ℃ for 12-14 hours, cooling, then carrying out machining, and cutting the head, tail and milling the surface.
And 4, step 4: hot rolling:
heating the cast ingot to 480-510 ℃, preserving heat for more than 3 hours, and hot rolling the cast ingot in a 1+1 type hot rolling mill group to form a hot rolled blank with the thickness of 6.0-7.0 mm, wherein the final rolling temperature is 300-340 ℃.
And 5: cold rolling:
the hot rolled blank is cold rolled to the thickness of a finished product of 0.7-1.5 mm, the cold rolling reduction rate of each pass is 20-40%, the refractive index of cold rolling oil is controlled to be more than 90%, and the kinematic viscosity at 40 ℃ is 2.2-2.4 mm2And/s, controlling the oil temperature of the rolling oil to be between 35 and 45 ℃. The roughness of the roller is controlled to Ra0.3-0.4 μm. The surface of the aluminum coil is not allowed to have obvious surface defects with hand feeling, such as scratches, marks and the like, bright strips are not allowed, color difference is caused, and the aluminum coil is required to be tightened by a steel belt to prevent a loose layer.
Step 6: and (3) continuous complete annealing of a finished product:
the work in process sheet, which has been rolled to final thickness, is annealed on a 1850mm continuous annealing line.
Firstly, uncoiling a coiled material which is rolled to a required thickness on a continuous annealing line, then sewing a head of the coiled material with a tail of the previous coiled material, and enabling the cleaned aluminum alloy strip to pass through the continuous annealing line at a preset speed of 10-20 m/min, wherein the temperature in the annealing line of the continuous annealing line is set to be 420-480 ℃.
The annealed strip comes out from the continuous annealing line, is properly cooled by water, dried and then enters a 17-roll straightener to be straightened, so that the 5182 aluminum alloy thin plate strip obtains better flatness. Finally, the fabric is formed by winding.
And 7: bending, straightening, cleaning and plate pulling: the plate shape straightness of the coiled material is less than or equal to 10I.
And 8: cutting into slices by flying shear: the plate flatness requirement is less than or equal to 1 mm/m.
The performance indexes of the 5182-O state aluminum alloy plate for the automobile inner plate produced in the examples 1 to 3 are detailed in Table 1.
TABLE 1 Performance index of 5182-O State aluminum alloy sheet for automobile inner panel produced in examples 1 to 3
The above-mentioned embodiments are merely preferred embodiments of the present invention, which are merely illustrative and not restrictive, and it should be understood that other embodiments may be easily made by those skilled in the art by replacing or changing the technical contents disclosed in the specification, and therefore, all changes and modifications that are made on the principle of the present invention should be included in the scope of the claims of the present invention.
Claims (7)
1. A5182-O state aluminum alloy plate for an automobile inner plate is characterized by comprising the following raw materials in percentage by weight: 0.1-0.15% of Si, 0.15-0.3% of Fe, less than or equal to 0.03% of Cu, 0.2-0.4% of Mn, 4.5-4.9% of Mg4, 0.03-0.07% of Cr0, less than or equal to 0.1% of Zn, 0.015-0.04% of Ti and the balance of Al;
the production method of the 5182-O state aluminum alloy plate for the automobile inner plate comprises the following steps:
step 1: preparing materials according to the raw material composition;
step 2: smelting and casting: smelting and semi-continuously casting the raw materials in the step 1 to obtain an ingot of 550-630 mm;
and step 3: carrying out homogenization heat treatment on the cast ingot, and machining and milling the surface;
and 4, step 4: hot rolling: hot rolling the cast ingot to a hot rolled blank with the thickness of 6.0-7.0 mm;
and 5: cold rolling: cold rolling the hot rolled blank to the thickness of 0.7-1.5 mm of a finished product;
step 6: and (3) continuous complete annealing of a finished product: carrying out rapid annealing on a finished product obtained by cold rolling in a continuous annealing line, wherein the temperature in the annealing furnace of the continuous annealing line is set to be 420-480 ℃, and the speed of an aluminum alloy strip in the annealing furnace is 10-20 m/min;
and 7: performing stretch bending, straightening and cleaning, and performing stretch straightening on the plate shape, wherein the flatness of the plate shape of the coiled material is less than or equal to 10I;
and 8: and (5) cutting into slices by flying shears, wherein the flatness of the plate is required to be less than or equal to 1 mm/m.
2. The 5182-O state aluminum alloy plate for the automobile inner plate as claimed in claim 1, which is prepared from the following raw materials in percentage by weight: 0.12-0.128% of Si, 0.174-0.252% of Fe, 0.013-0.015% of Cu, 0.247-0.272% of Mn, 0.037-0.042% of Mg 4.570-4.831%, 0.037-0.042% of Cr, 0.023-0.025% of Zn, 0.024-0.031% of Ti, and the balance of Al.
3. The production method of a 5182-O temper aluminum alloy plate for an automobile inner panel according to claim 1, wherein the specific operations of smelting and casting in the step 2 are as follows:
smelting the mixed metal at 700-750 ℃ for 5-8 hours, standing for refining, degassing, adding a grain refiner Al-5Ti-1B wire, filtering, and measuring the hydrogen content in a launder to be less than or equal to 0.12mL/100g Al; then casting by a semi-continuous casting method at the temperature of 700-730 ℃, wherein the casting speed is 45-55 mm/min.
4. The production method of the 5182-O state aluminum alloy plate for the automobile inner plate according to claim 1, wherein the temperature of the ingot casting homogenization heat treatment in the step 3 is 500-520 ℃, and the holding time of ingot casting soaking is 12-24 hours.
5. The production method of a 5182-O temper aluminum alloy sheet for automobile inner panels as claimed in claim 1, wherein the hot rolling in step 4 comprises the specific operations of:
heating the cast ingot to 480-510 ℃, preserving heat for more than 3 hours, and hot rolling the cast ingot in a 1+1 type hot rolling mill group to obtain a hot rolled blank with the thickness of 6.0-7.0 mm, wherein the final rolling temperature is 300-340 ℃.
6. The method for producing a 5182-O state aluminum alloy sheet material for an automobile inner panel according to claim 1, wherein in the cold rolling in step 5, the cold rolling reduction of each pass is 20-40%, the cold rolling oil has a controlled refractive index of more than 90%, the kinematic viscosity at 40 ℃ is 2.2-2.4 mm/s, the oil temperature of the rolling oil is controlled to be 35-45 ℃, and the roughness of the roller is controlled to Ra0.3-0.4 μm.
7. The production method of the 5182-O state aluminum alloy sheet material for the automobile inner panel as recited in claim 1, wherein the continuous full annealing of the finished product comprises the following specific operations:
firstly, uncoiling a coiled material which is rolled to a required thickness on a continuous annealing line, then sewing a head of the coiled material with a tail of the previous coiled material, enabling the cleaned aluminum alloy strip to pass through an annealing furnace of the continuous annealing line at a preset speed of 10-20 m/min, enabling the annealed strip to come out of the continuous annealing line, cooling by water, drying, straightening by a 17-roll straightening machine, and finally coiling.
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