CN115029592B - Production method of 5052-H32 aluminum alloy plate for automobile structural part - Google Patents
Production method of 5052-H32 aluminum alloy plate for automobile structural part Download PDFInfo
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- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 139
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 claims abstract description 44
- 238000005097 cold rolling Methods 0.000 claims abstract description 38
- 238000000137 annealing Methods 0.000 claims abstract description 36
- 238000010438 heat treatment Methods 0.000 claims abstract description 36
- 238000004140 cleaning Methods 0.000 claims abstract description 31
- 238000010924 continuous production Methods 0.000 claims abstract description 28
- 238000005098 hot rolling Methods 0.000 claims abstract description 24
- 238000005452 bending Methods 0.000 claims abstract description 21
- 239000000463 material Substances 0.000 claims abstract description 20
- 239000000956 alloy Substances 0.000 claims abstract description 10
- 238000005266 casting Methods 0.000 claims abstract description 9
- 239000002994 raw material Substances 0.000 claims abstract description 9
- 238000003723 Smelting Methods 0.000 claims abstract description 7
- 238000003801 milling Methods 0.000 claims abstract description 7
- 238000000265 homogenisation Methods 0.000 claims abstract description 6
- 238000005096 rolling process Methods 0.000 claims description 28
- 239000002699 waste material Substances 0.000 claims description 13
- 229910045601 alloy Inorganic materials 0.000 claims description 8
- 239000007788 liquid Substances 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 3
- 239000012535 impurity Substances 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 3
- 238000004321 preservation Methods 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims 1
- 238000002360 preparation method Methods 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 17
- 238000011161 development Methods 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- CLOMYZFHNHFSIQ-UHFFFAOYSA-N clonixin Chemical compound CC1=C(Cl)C=CC=C1NC1=NC=CC=C1C(O)=O CLOMYZFHNHFSIQ-UHFFFAOYSA-N 0.000 description 2
- 238000009749 continuous casting Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000001953 recrystallisation Methods 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- GNFTZDOKVXKIBK-UHFFFAOYSA-N 3-(2-methoxyethoxy)benzohydrazide Chemical compound COCCOC1=CC=CC(C(=O)NN)=C1 GNFTZDOKVXKIBK-UHFFFAOYSA-N 0.000 description 1
- FGUUSXIOTUKUDN-IBGZPJMESA-N C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 Chemical compound C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 FGUUSXIOTUKUDN-IBGZPJMESA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000000875 corresponding effect Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001687 destabilization Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000011534 incubation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
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- 239000002356 single layer Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
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- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
Classifications
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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
- C22C21/06—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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/02—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of sheets
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D7/00—Casting ingots, e.g. from ferrous metals
- B22D7/005—Casting ingots, e.g. from ferrous metals from non-ferrous metals
-
- 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
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- Crystallography & Structural Chemistry (AREA)
- Metal Rolling (AREA)
Abstract
The invention relates to a production method of a 5052-H32 aluminum alloy plate for an automobile structural member, and belongs to the technical field of preparation of aluminum alloy materials for automobile structural members. The method comprises the following steps: providing an air cushion furnace continuous production line, wherein the air cushion furnace continuous production line sequentially comprises a cleaning unit, an air cushion furnace and a straightener along the material conveying direction; a. and (3) casting: smelting and casting the raw materials of 5052 aluminum alloy to obtain an aluminum alloy cast ingot; b. homogenizing: sawing and milling the surface of the aluminum alloy ingot, and carrying out homogenization heat treatment; c. and (3) hot rolling: carrying out hot rolling on the aluminum alloy cast ingot subjected to the homogenization heat treatment to obtain an aluminum alloy plate; d. cold rolling: cold rolling the hot rolled aluminum alloy plate; e. cleaning: sending the cold-rolled aluminum alloy plate into a cleaning unit for cleaning; f. annealing: sending the cleaned aluminum alloy plate into an air cushion furnace for heat treatment; g. stretch bending and straightening: and carrying out stretch bending straightening treatment on the aluminum alloy plate subjected to heat treatment in a straightener to obtain the 5052-H32 aluminum alloy plate.
Description
Technical Field
The invention belongs to the technical field of preparation of aluminum alloy materials for automobile structural parts, and relates to a production method of a 5052-H32 aluminum alloy plate for an automobile structural part.
Background
The automobile industry in the world now extremely pays attention to environmental protection, new energy automobiles are developed gradually, the dead weight of the automobiles is reduced under the large environment, the exhaust emission is reduced, the energy consumption is reduced, and the method is very important measure for various automobile manufacturers and is very effective means for popularizing the use of aluminum alloy on automobiles. Currently, automobile manufacturers have used 6-series aluminum alloys in the field of automobile outer panels and 5-series aluminum alloys in the field of automobile inner panels.
The 5052-H32 aluminum alloy has the characteristics of good corrosion resistance, medium strength, easy processing, good welding performance, low cost and the like, is widely applied to the fields of petrochemical industry, construction, electronic and electric appliances, transportation and the like, and has very good potential for being used in the direction of automobile structural parts. However, the development of the alloy is mainly focused on optimizing the production flow and method window, such as a short-flow production method of directly reducing the production line of hot rolling, so as to achieve the purpose of saving the cost, and the alloy is suitable for products with the thickness of more than or equal to 2mm and low in surface requirement, or is used for developing materials meeting performance indexes by optimizing a conventional box annealing method after a cold rolling process, or is used for performing a twice stabilizing annealing method so as to improve the surface quality, but the whole production flow is longer.
The 5052 aluminum alloy is a non-heat-treatable reinforced aluminum alloy, mainly achieves a deformation reinforcing effect through cold deformation, generally can reduce strength through recrystallization annealing or stabilization annealing, improves plasticity and elongation so as to facilitate subsequent use, and is mainly developed by adopting a box-type furnace, and has the following characteristics during production: 1) The process route after hot rolling is as follows: cold rolling, cleaning, box furnace annealing, stretch bending and straightening, multiple production procedures, low yield, general surface quality after box withdrawal and long production period; 2) The heat treatment temperature window is narrower, the annealing temperatures of materials with different hot rolling finishing temperatures and cold rolling deformation rates are different, the heat treatment annealing difficulty is high, and the stability is poor; 3) When the coiled material is annealed in the box furnace, the aluminum alloy plate material has inconsistent performance uniformity due to different length and temperature of the heated inside and outside of the coiled material, and the performance of the outer ring is generally lower and the performance of the inner ring is higher. Seriously affecting the stability of the material in use.
However, aluminum plates for producing automobile structural members generally require aluminum alloy plates with uniform and consistent properties, low anisotropy and good surface quality, and no related technology is used for producing and developing 5052-H32 alloy with corresponding properties at present.
Disclosure of Invention
In view of the above, the invention aims to provide a 5052-H32 aluminum alloy plate production method for an automobile structural member, so as to fill the blank of research on 5052-H32 aluminum alloy for the automobile structural member, comprehensively consider the characteristics of the performance and the surface requirement of the automobile structural member and the continuous annealing production line of an air cushion furnace, redesign the production path of the 5052-H32 aluminum alloy, and develop a novel 5052-H32 aluminum alloy plate production method for the automobile structural member.
In order to achieve the above purpose, the present invention provides the following technical solutions:
a production method of a 5052-H32 aluminum alloy plate for an automobile structural member comprises the following steps:
providing an air cushion furnace continuous production line, wherein the air cushion furnace continuous production line sequentially comprises a cleaning unit, an air cushion furnace and a straightener along the material conveying direction;
a. and (3) casting: smelting a raw material of 5052 aluminum alloy into liquid aluminum alloy in a smelting furnace, and casting to obtain an aluminum alloy cast ingot;
b. homogenizing: sawing and milling the surface of the aluminum alloy cast ingot, and placing the aluminum alloy cast ingot in a homogenizing furnace for homogenizing heat treatment;
c. and (3) hot rolling: taking the aluminum alloy ingot after the homogenization heat treatment out of the furnace for hot rolling to obtain an aluminum alloy plate with the thickness of 2.5-8 mm, wherein the final rolling temperature is 335-355 ℃;
d. cold rolling: cold rolling the aluminum alloy plate subjected to hot rolling to an aluminum alloy plate with the thickness of 1.0-3.0 mm;
e. cleaning: feeding the cold-rolled aluminum alloy plate into a cleaning unit of a continuous production line of an air cushion furnace for cleaning;
f. annealing: sending the cleaned aluminum alloy plate into an air cushion furnace of the air cushion furnace continuous production line for heat treatment;
g. stretch bending and straightening: and carrying out stretch bending straightening treatment on the aluminum alloy plate subjected to heat treatment in a straightener of the air cushion furnace continuous production line to obtain the 5052-H32 aluminum alloy plate.
In some embodiments of the present disclosure, the alloy chemistry of the 5052 aluminum alloy described in step a is: si: less than or equal to 0.25 percent, cu: less than or equal to 0.10 percent, mg:2.2 to 2.8 percent of Zn: less than or equal to 0.10 percent, mn: less than or equal to 0.10 percent, cr:0.15 to 0.35 percent of Fe: less than or equal to 0.40 percent, and single impurity is less than or equal to 0.05 percent; the total content is less than or equal to 0.15, and the balance is Al.
In some embodiments of the present disclosure, the process waste in the feedstock in step a is 60-80%.
In some embodiments of the present disclosure, the homogenization heat treatment temperature in step b is 480±10 ℃ and the incubation time is 6 hours.
In some embodiments of the present disclosure, the hot rolling in step c comprises rough rolling and finish rolling, wherein the thickness of the intermediate billet after rough rolling is 42 to 44mm.
In some embodiments of the present disclosure, in step c, the rough rolled intermediate billet is subjected to four continuous rolling finish rolling to obtain a hot rolled coil having a thickness of 2.5 to 8 mm.
In some embodiments of the present disclosure, the cold rolling deformation rate in the cold rolling process in step d is 25 to 65%.
In some embodiments of the present disclosure, in step f, the air cushion furnace in the heat treatment has a furnace gas temperature of 323-327 ℃ and a production speed of 25-35 m/min, and after the aluminum alloy sheet leaves the air cushion furnace, it is air-cooled to 10-30 ℃.
In some embodiments of the present disclosure, the stretch bend straightening process in step g has an elongation of from 0.5 to 0.8%.
The invention has the beneficial effects that:
1. according to the invention, through optimizing the production process after the hot rolling process, the same production line is continuously processed by adopting an air cushion furnace continuous production line for cleaning, annealing and stretch bending straightening of the aluminum alloy plate, and related process parameters are improved, so that the 5052-H32 aluminum alloy with the performance fully meeting the GB/T3880, ASTMB209 and EN485 standards and good stamping performance is obtained, the method is suitable for the application field of automobile structural parts, the production period is greatly shortened, and the production efficiency is improved; compared with the common production flow, the method reduces the head and tail throwing waste materials of each procedure, improves the yield, and has a certain guiding effect on the development of heat treatment processes of other brands of aluminum alloy.
2. According to the invention, the process waste ratio of the casting raw materials is adjusted, 60-80% of process waste is adopted for proportioning, so that the 5052-H32 aluminum alloy with energy conservation, environmental protection and high yield is obtained, the utilization rate of the process waste is increased, the metal stagnation of the waste is reduced, and the production cost is saved.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objects and other advantages of the invention may be realized and obtained by means of the instrumentalities and combinations particularly pointed out in the specification.
Detailed Description
Other advantages and effects of the present invention will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present invention with reference to specific examples. The invention may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present invention. It should be noted that the following embodiments merely illustrate the basic idea of the present invention by way of illustration, and the following embodiments and features of the embodiments may be combined with each other without conflict.
A production method of a 5052-H32 aluminum alloy plate for an automobile structural member comprises the following steps:
a. and (3) casting: preparing the raw materials for preparing the 5052 aluminum alloy according to the weight percentage, wherein the process waste is 60-80%, the chemical components of the alloy meet the requirements of GB/T3190, putting the prepared raw materials for preparing the 5052 aluminum alloy into a smelting furnace to be smelted into liquid aluminum alloy, and carrying out semi-continuous casting of slab ingots after refining, slag skimming and double-stage plate filtration to obtain the trapezoid aluminum alloy ingots.
b. Homogenizing: sawing and milling the surface of the aluminum alloy ingot, placing the aluminum alloy ingot in a homogenizing furnace for homogenizing heat treatment after sawing and milling the aluminum alloy ingot, firstly heating the aluminum alloy ingot to 480+/-10 ℃, and then preserving heat for 4-10 hours;
c. and (3) hot rolling: taking the homogenized aluminum alloy ingot out of the furnace for hot rolling, wherein the thickness of a rough rolled intermediate billet is 42-44 mm, and performing four continuous rolling and finish rolling on the rough rolled intermediate billet to obtain an aluminum alloy plate with the thickness of 2.5-8 mm, and forming a hot rolled coil, wherein the finish rolling temperature is 330-350 ℃;
d. cold rolling: cold rolling the hot-rolled aluminum alloy plate to the thickness of a finished product of the aluminum alloy plate, wherein the thickness is 1.0-3.0 mm, the cold rolling deformation rate is 25-65%, and forming a cold-rolled coil;
e. cleaning: uncoiling the cold rolled coil, and cleaning the cold rolled coil in a cleaning unit of a continuous production line of an air cushion furnace;
f. annealing: feeding the cleaned aluminum alloy plate into an air cushion furnace of the air cushion furnace continuous production line for heat treatment, wherein the furnace gas temperature in the air cushion furnace is 323-327 ℃, the production speed is 25-35 m/min, and after the aluminum alloy plate leaves the air cushion furnace, air-cooling the aluminum alloy plate to 10-30 ℃;
g. stretch bending and straightening: stretch bending and straightening treatment is carried out on the aluminum alloy plate subjected to heat treatment in a straightener of the air cushion furnace continuous production line, and the elongation is 0.5-0.8%, so that the 5052-H32 aluminum alloy plate is obtained.
Example 1
a. And (3) casting: the raw materials for preparing 5052 aluminum alloy are prepared according to the weight percentage, the process waste is 80%, and the chemical components of the alloy are as follows: si:0.25%, cu:0.10%, mg:2.5%, zn:0.10%, mn:0.10%, cr:0.25%, fe:0.40 percent, and the content of single impurities is less than or equal to 0.05 percent; adding less than or equal to 0.15 and the balance of Al, putting the prepared raw materials of 5052 aluminum alloy into a smelting furnace to be smelted into liquid aluminum alloy, and carrying out semi-continuous casting of slab ingots after refining, slag skimming and double-stage plate filtration to obtain the trapezoid aluminum alloy ingots.
b. Homogenizing: sawing and milling the surface of an aluminum alloy ingot, placing the aluminum alloy ingot in a homogenizing furnace for homogenizing heat treatment after sawing and milling the aluminum alloy ingot, firstly heating the aluminum alloy ingot to 480+/-10 ℃, and then preserving heat for 6 hours;
c. and (3) hot rolling: taking the homogenized aluminum alloy ingot out of the furnace for hot rolling, wherein the thickness of a rough rolled intermediate billet is 42mm, and performing four continuous rolling and finish rolling on the rough rolled intermediate billet to obtain a hot rolled coil with the thickness of 4.5mm, and the final rolling temperature is 340 ℃;
d. cold rolling: cold-rolling the hot-rolled aluminum alloy plate to the thickness of a finished product of the aluminum alloy plate, wherein the thickness is 2.0mm, and the cold-rolling deformation rate is 56%;
e. cleaning: cleaning the cold-rolled aluminum alloy plate in a cleaning unit of a continuous production line of an air cushion furnace;
f. annealing: feeding the cleaned aluminum alloy plate into an air cushion furnace of the air cushion furnace continuous production line for heat treatment, wherein the furnace gas temperature in the air cushion furnace is 325 ℃, the production speed is 33m/min, and after the aluminum alloy plate leaves the air cushion furnace, air-cooling the aluminum alloy plate to 20 ℃;
g. stretch bending and straightening: stretch bending straightening treatment is carried out on the aluminum alloy plate subjected to heat treatment in a straightener of the air cushion furnace continuous production line, the elongation is 0.6%, and the 5052-H32 aluminum alloy plate is obtained.
Example 2
The present embodiment differs from embodiment 1 in that in the present embodiment:
c. and (3) hot rolling: taking the homogenized aluminum alloy ingot out of the furnace for hot rolling, wherein the thickness of a rough rolled intermediate billet is 42mm, and performing four continuous rolling and finish rolling on the rough rolled intermediate billet to obtain a hot rolled coil with the thickness of 2.8mm, and the final rolling temperature is 340 ℃;
d. cold rolling: and (3) cold-rolling the hot-rolled aluminum alloy plate to the thickness of a finished product of the aluminum alloy plate, wherein the thickness is 2.0mm, and the cold-rolling deformation rate is 29%.
Because the enterprises for installing the air cushion furnace continuous production line equipment are not many at present, and the method is mainly applied to the production of high-precision and high-added-value aluminum plate strips such as automobile plates and aviation plates, and the heat treatment development of common aluminum alloys such as 5052 is mainly carried out by adopting a box-type furnace, in order to widen the application of the 5052 alloy in the automobile field and improve the added value of materials, the method combines the advantages of the air cushion furnace continuous production line to formulate a reasonable annealing process, limits the heat treatment temperature and the production speed, and develops a 5052-H32 aluminum alloy plate production method with excellent quality and performance, and the method is mainly characterized in that:
1) The process route after hot rolling is as follows: the cold rolling-air cushion furnace continuous production line (the air cushion furnace continuous production line comprises the process flows of cleaning, annealing and stretch bending straightening) shortens the production flow, greatly shortens the production period, improves the production efficiency, reduces the head and tail throwing waste materials of each process and improves the yield compared with the common production flow.
2) The aluminum alloy plate is subjected to single-layer continuous annealing in the air cushion furnace, and the air cushion furnace has high temperature control precision, so that the uniformity of material performance is good, the defects of surface sticking, oil spots and the like generated by box annealing are avoided, and the 5052-H32 aluminum alloy plate has good surface quality.
3) 60-80% of process waste is adopted for proportioning, so that the utilization rate of the waste is increased, the metal stagnation of the waste is reduced, the cost is saved, the carbon emission is reduced, and the energy conservation and the environmental protection are realized.
4) The annealing temperature of the air cushion furnace is higher, the influence of cold rolling deformation rate on performance stability can be reduced by high-temperature rapid annealing, the internal texture energy of the material can be adjusted, the fiber texture part of cold rolling deformation is converted into a recrystallization texture, the anisotropy of the material is weakened, the forming performance of the material is improved, and the material is suitable for being used as an automobile structural part.
Comparative example 1
The present comparative example differs from example 1 in that, in the present comparative example:
e. cleaning: cleaning the cold-rolled aluminum alloy plate in a cleaning line;
f. annealing: annealing the cleaned coil in a box-type furnace, setting the annealing temperature to 255 ℃, and preserving the heat for 4 hours;
g. stretch bending and straightening: stretch bending straightening treatment is carried out on the aluminum alloy plate subjected to heat treatment in a straightener of the air cushion furnace continuous production line, the elongation is 0.6%, and the 5052-H32 aluminum alloy plate is obtained.
Comparative example 2
The present comparative example differs from example 1 in that, in the present comparative example:
c. and (3) hot rolling: taking the homogenized aluminum alloy ingot out of the furnace for hot rolling, wherein the thickness of a rough rolled intermediate billet is 42mm, and performing four continuous rolling and finish rolling on the rough rolled intermediate billet to obtain a hot rolled coil with the thickness of 2.8mm, and the final rolling temperature is 340 ℃;
d. cold rolling: cold-rolling the hot-rolled aluminum alloy plate to the thickness of a finished product of the aluminum alloy plate, wherein the thickness is 2.0mm, and the cold-rolling deformation rate is 29%;
e. cleaning: cleaning the cold-rolled aluminum alloy plate in a cleaning line;
f. annealing: annealing the cleaned coil in a box-type furnace, wherein the annealing temperature is set at 205 ℃, and the heat preservation time is 4 hours;
g. stretch bending and straightening: stretch bending straightening treatment is carried out on the aluminum alloy plate subjected to heat treatment in a straightener of the air cushion furnace continuous production line, the elongation is 0.6%, and the 5052-H32 aluminum alloy plate is obtained.
Comparative example 3
The present comparative example differs from example 1 in that, in the present comparative example:
c. and (3) hot rolling: taking the homogenized aluminum alloy ingot out of the furnace for hot rolling, wherein the thickness of a rough rolled intermediate billet is 42mm, and performing four continuous rolling and finish rolling on the rough rolled intermediate billet to obtain a hot rolled coil with the thickness of 2.8mm, and the final rolling temperature is 340 ℃;
d. cold rolling: cold-rolling the hot-rolled aluminum alloy plate to the thickness of a finished product of the aluminum alloy plate, wherein the thickness is 2.0mm, and the cold-rolling deformation rate is 29%;
e. cleaning: cleaning the cold-rolled aluminum alloy plate in a cleaning line;
f. annealing: annealing the cleaned coil in a box-type furnace, setting the annealing temperature to 255 ℃, and preserving the heat for 4 hours;
g. stretch bending and straightening: stretch bending straightening treatment is carried out on the aluminum alloy plate subjected to heat treatment in a straightener of the air cushion furnace continuous production line, the elongation is 0.6%, and the 5052-H32 aluminum alloy plate is obtained.
Performance tests were carried out on the 5052-H32 aluminum alloy sheets produced in each of examples and comparative examples, the results of which are shown in Table 1, rm, rp0.2, A of examples 1-2 and comparative examples 1-2 satisfy GB/T3880, ASTMB209 and EN485 standards, and comparative example 3 satisfies GB/T3880, EN485 standards, but does not satisfy ASTMB209 standards.
Under the condition that the 5052-H32 aluminum alloy plate achieves the same mechanical properties (Rm, rp0.2, A), the embodiment 1 and the embodiment 2 illustrate that different cold rolling deformation rates are adopted in the cold rolling process flow, and the air cushion furnace continuous production line is adopted for cleaning, annealing and stretch bending straightening, so that the aluminum alloy plate with different cold rolling deformation rates can reach the H32 property even if the same heat treatment process is adopted for annealing, namely the air cushion furnace continuous production line can weaken the sensitivity of the annealing process to the cold rolling deformation rate, increase the heat treatment window of the annealing process, increase the fault tolerance of the annealing process, improve the production efficiency and be beneficial to production; comparative example 1 and comparative example 2 illustrate that different cold rolling deformation rates are adopted in the cold rolling process flow, different heat treatment processes are required to be adopted in a common box-type furnace to enable the aluminum alloy plate to reach the property of H32, and comparative example 1 and comparative example 3 illustrate that different cold rolling deformation rates are adopted in the cold rolling process flow, and the properties of the aluminum alloy plate obtained by adopting the same heat treatment process in the common box-type furnace are obviously different; the box type annealing process is sensitive to the cold rolling deformation rate, and the annealing process has a smaller heat treatment window, so that the production is not facilitated; the delta r value and the r average value of the examples are compared with those of the 5052-H32 aluminum alloy plate prepared by the existing production process, so that the stamping formability and the anisotropism of the 5052-H32 aluminum alloy plate prepared by the production method of the 5052-H32 aluminum alloy plate for the automobile structural part are known.
The r-value in table 1 is a plastic strain ratio, which is one of the key indexes for evaluating the press formability of a material, and the r-value reflects the ability of the material to resist destabilization and thinning during press forming, and the higher the r-value, the better the press formability performance of the sheet material. The Deltar value represents the anisotropy of the material, and the smaller the Deltar value is, the smaller the anisotropy of the material is, and the deformation in each direction is uniform and is not easy to crack when the deformation occurs. The mechanical properties of the 5052-H32 aluminum alloy plate obtained in the embodiment of the invention are shown in the table 1, and on the basis of better yield strength, tensile strength and good elongation, compared with the 5052-H32 aluminum alloy plate in the comparative example, the aluminum alloy plate also has higher r average value and lower delta r value, which indicates that the 5052-H32 aluminum alloy plate prepared by adopting the 5052-H32 aluminum alloy plate production method provided by the invention has good comprehensive strength performance, completely meets GB/T3880, ASTMB209 and EN485 standards, has excellent stamping forming performance, uniform and consistent performance of the plate everywhere, low variability and good surface quality, and is more suitable for the production of automobile structural members.
TABLE 1
Finally, it is noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the present invention, which is intended to be covered by the claims of the present invention.
Claims (5)
1. A method for producing 5052-H32 aluminum alloy sheet for automotive structural members, comprising the steps of:
providing an air cushion furnace continuous production line, wherein the air cushion furnace continuous production line sequentially comprises a cleaning unit, an air cushion furnace and a straightener along the material conveying direction;
a. and (3) casting: smelting a raw material of 5052 aluminum alloy into liquid aluminum alloy in a smelting furnace, and casting to obtain an aluminum alloy cast ingot, wherein the process waste in the raw material accounts for 60-80%;
b. homogenizing: sawing and milling the surface of the aluminum alloy cast ingot, and placing the aluminum alloy cast ingot in a homogenizing furnace for homogenizing heat treatment;
c. and (3) hot rolling: taking the aluminum alloy ingot after the homogenization heat treatment out of the furnace for hot rolling to obtain an aluminum alloy plate with the thickness of 2.5-8 mm, wherein the final rolling temperature is 335-355 ℃;
d. cold rolling: cold rolling the hot-rolled aluminum alloy plate to an aluminum alloy plate with the thickness of 1.0-3.0 mm, wherein the cold rolling deformation rate is 25-65%;
e. cleaning: feeding the cold-rolled aluminum alloy plate into a cleaning unit of a continuous production line of an air cushion furnace for cleaning;
f. annealing: feeding the cleaned aluminum alloy plate into an air cushion furnace of the air cushion furnace continuous production line for heat treatment, wherein the furnace gas temperature of the air cushion furnace is 323-327 ℃, the production speed is 25-35 m/min, and after the aluminum alloy plate leaves the air cushion furnace, air cooling the aluminum alloy plate to 10-30 ℃;
g. stretch bending and straightening: and carrying out stretch bending straightening treatment on the aluminum alloy plate subjected to heat treatment in a straightener of the air cushion furnace continuous production line, wherein the elongation of the stretch bending straightening treatment is 0.5-0.8%, and obtaining the 5052-H32 aluminum alloy plate.
2. A method of producing 5052-H32 aluminum alloy sheet for automotive structural members as set forth in claim 1 wherein: the alloy chemical composition of the 5052 aluminum alloy in the step a is as follows: si: less than or equal to 0.25 percent, cu: less than or equal to 0.10 percent, mg: 2.2-2.8%, zn: less than or equal to 0.10 percent, mn: less than or equal to 0.10 percent, cr:0.15 to 0.35 percent of Fe: less than or equal to 0.40 percent, and less than or equal to 0.05 percent of single impurity; the total content is less than or equal to 0.15 percent, and the balance is Al.
3. A method of producing 5052-H32 aluminum alloy sheet for automotive structural members as set forth in claim 1 wherein: in the step b, the homogenization heat treatment temperature is 480+/-10 ℃ and the heat preservation time is 6 hours.
4. A method of producing 5052-H32 aluminum alloy sheet for automotive structural members as set forth in claim 1 wherein: the hot rolling in the step c comprises rough rolling and finish rolling, wherein the thickness of the intermediate billet after rough rolling is 42-44 mm.
5. The method for producing 5052-H32 aluminum alloy sheet for automotive structural members as set forth in claim 4, wherein: in the step c, the intermediate billet after rough rolling is subjected to four continuous rolling and finish rolling to obtain a hot rolled coil with the thickness of 2.5-8 mm.
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