CN116516221A - 6000-series aluminum alloy medium plate for spinning rim and preparation method thereof - Google Patents
6000-series aluminum alloy medium plate for spinning rim and preparation method thereof Download PDFInfo
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- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 133
- 238000009987 spinning Methods 0.000 title claims abstract description 41
- 238000002360 preparation method Methods 0.000 title abstract description 20
- 238000005096 rolling process Methods 0.000 claims abstract description 31
- 238000010438 heat treatment Methods 0.000 claims abstract description 25
- 239000002994 raw material Substances 0.000 claims abstract description 18
- 239000012535 impurity Substances 0.000 claims abstract description 8
- 238000009749 continuous casting Methods 0.000 claims description 22
- 238000000034 method Methods 0.000 claims description 21
- 238000000137 annealing Methods 0.000 claims description 19
- 238000001816 cooling Methods 0.000 claims description 14
- 238000005098 hot rolling Methods 0.000 claims description 14
- 238000005097 cold rolling Methods 0.000 claims description 13
- 238000005266 casting Methods 0.000 claims description 11
- 238000003723 Smelting Methods 0.000 claims description 8
- 239000000498 cooling water Substances 0.000 claims description 8
- 238000002791 soaking Methods 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 238000005303 weighing Methods 0.000 claims description 8
- 238000004519 manufacturing process Methods 0.000 claims description 6
- 229910052782 aluminium Inorganic materials 0.000 abstract description 14
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 abstract description 14
- 239000000463 material Substances 0.000 abstract description 4
- 239000000956 alloy Substances 0.000 description 25
- 229910045601 alloy Inorganic materials 0.000 description 22
- 238000009826 distribution Methods 0.000 description 9
- 230000001276 controlling effect Effects 0.000 description 7
- 239000013078 crystal Substances 0.000 description 5
- 238000005259 measurement Methods 0.000 description 5
- 238000003466 welding Methods 0.000 description 4
- 229910018566 Al—Si—Mg Inorganic materials 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 2
- 238000005275 alloying Methods 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000006911 nucleation Effects 0.000 description 2
- 238000010899 nucleation Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 238000004381 surface treatment Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000004512 die casting Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 229910001338 liquidmetal Inorganic materials 0.000 description 1
- 239000002932 luster Substances 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000010080 roll forging Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
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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
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- 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
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- 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
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Abstract
6000 series aluminum alloy medium plate for spinning rim is prepared from the following raw materials in percentage by weight: si=0.45 to 0.75, fe < 0.65, cu=0.25 to 0.35, mn < 0.10, mg=0.95 to 1.15, cr=0.15 to 0.30, zn < 0.20, ti < 0.10, and the balance of Al and unavoidable impurities. The preparation process adopts a precise heat treatment and rolling control technology to realize that the second phase and the grain structure of the aluminum material from the ingot to the strip are tiny, the thickness of the prepared finished aluminum alloy plate is 6-8 mm, the grain size is less than or equal to 50 mu m, the second phase size is less than or equal to 10 mu m, the tensile strength is more than or equal to 100MPa, the yield strength is 35-90 MPa, the elongation is more than or equal to 30%, the problem of no orange peel is caused on the surface of the rim prepared by spin forming, and the technical requirement of aluminum for the rim can be better met.
Description
Technical Field
The invention belongs to the technical field of aluminum alloy materials, and particularly relates to a 6000-series aluminum alloy medium plate for spinning rims and a preparation method thereof.
Background
Along with the development of the automobile industry to environmental protection, comfort, safety and energy saving, the lightweight design of the automobile is particularly important, and the weight of the automobile is reduced by the rim of the hub so as to promote the aluminum alloying of the automobile hub. The hub comprises a rim and a spoke. The rim and the spoke are compounded into an ultra-light hub structure by friction stir welding.
With the development of the automobile industry and the improvement of the requirements of consumers on the driving comfort, the aluminum alloy is favored by people in the preparation of automobile hubs by the unique performance, and the aluminum alloy hubs have the following advantages: (1) fast heat dissipation: at normal temperature, the heat conductivity coefficient of the aluminum alloy is 3 times that of steel, so that the tire burst caused by overheat of the wheel under high-speed operation can be effectively avoided, the service lives of tires of automobiles and motorcycles are greatly prolonged, and particularly the service life of tires of high-load trucks is prolonged. (2) light weight: the density of the aluminum material is lower than that of steel, each aluminum alloy hub can reduce the weight by about 2 kg, and the acceleration performance and the braking performance of the automobile are improved due to the light weight and small moment of inertia of the aluminum hub, so that the acceleration capability of the automobile is improved, and meanwhile, the oil consumption is reduced; (3) The aluminum alloy surface treatment method is rich and various, can show beautiful metallic luster, and improves the technological sense and artistic sense of the appearance of the hub.
Compared with the existing aluminum alloy rim preparation technology (casting method, forging method and stamping method), the rim prepared by the spinning forming method has stable performance, low cost and easy industrial production. The hub production process comprises the following steps: aluminum plate, rolling, flattening, direct welding, deburring, re-rounding, end cutting, flanging, roll forging, spinning, end cutting, compounding with die-casting spoke, ring welding, and workshop milling of a surface.
In the prior art, an Al-Si-Mg-based aluminum alloy for casting includes: ZL101, a356, alSi12Mg, germany and japan AC4C; deformed aluminum includes aluminum alloy grades 6063, 6061, 6082, 5052, etc., which have moderate strength and excellent formability. With the continuous pursuit of weight reduction of automobiles, aluminum alloy sheet thickness reduction, higher strength, and more excellent formability are demanded. The conventional 6000 series aluminum product in the prior art has the defects of high cracking risk after spinning forming, low yield, or substandard tensile property of the rim, high cost and difficult large-scale popularization and application. Therefore, there is a need to develop alloy compositions and preparation processes of 6000 series aluminum materials with higher comprehensive properties.
Disclosure of Invention
The technical purpose of the invention is as follows: the 6000-series aluminum alloy medium plate for the spinning rim and the preparation method thereof are provided, and the technical problems that the strength and the forming performance of the conventional 6000-series aluminum alloy are difficult to meet the technical preparation requirements of the spinning rim at the same time are solved.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: the 6000-series aluminum alloy medium plate for the spinning rim comprises the following aluminum alloy raw materials in percentage by weight: si=0.45 to 0.75, fe=0.05 to 0.65, cu=0.25 to 0.35, mn=0.04 to 0.10, mg=0.95 to 1.15, cr=0.15 to 0.30, zn=0.01 to 0.2, ti=0.02 to 0.10, and the balance Al and unavoidable impurity elements.
Further, the thickness of the aluminum alloy medium plate is 6-8 mm, the tolerance is +0.28/-0.02mm, the grain size is less than or equal to 50 mu m, the second phase size is less than or equal to 10 mu m, the tensile strength is more than or equal to 100MPa, the yield strength is 35-90 MPa, and the elongation is more than or equal to 30%.
A preparation method of a 6000-series aluminum alloy medium plate for spinning rims comprises the following steps:
s1, respectively weighing all components in the aluminum alloy raw materials according to the weight percentage, and adopting a semi-continuous casting method to control the cooling water quantity to be 155-162 ㎥/h and the water temperature cooling strength to be 30.5-31.2 ℃ during semi-continuous casting to prepare an aluminum alloy cast ingot for later use;
s2, performing heat treatment on the aluminum alloy cast ingot prepared in the step S1;
step S3, hot rolling the aluminum alloy cast ingot subjected to the heat treatment in the step S2 to obtain a hot rolled plate for later use;
s4, performing 1-3 times of cold rolling on the hot rolled plate obtained in the step S3 to obtain a medium plate with the thickness of 6-8 mm for later use;
and S5, carrying out annealing treatment on the medium plate obtained in the step S4 to obtain the finished product of the aluminum alloy medium plate.
Further, in step S1, the smelting temperature during the semi-continuous casting is 740-760 ℃, the casting temperature during the semi-continuous casting is 690-710 ℃, and the grain size from the core to the edge of the aluminum alloy ingot after the semi-continuous casting is 95-140 μm.
Further, in step S2, the specific operation during the heat treatment is that the aluminum alloy ingot is placed in an environment with a temperature of 560-570 ℃ for soaking treatment for 8-18 hours, and then naturally cooled to room temperature.
Further, in step S3, the specific operation during the hot rolling treatment is to place the aluminum alloy ingot in an environment with a temperature of 490-520 ℃ for heating treatment for 11-15 hours, and then control the start rolling temperature to 450-500 ℃ and the finish rolling temperature to be more than or equal to 350 ℃ to obtain a hot rolled plate with a finish rolling thickness of 8-10 mm.
Further, in step S5, the annealing temperature during the annealing treatment is not less than 320 ℃.
The invention has the beneficial effects that:
1. the invention relates to a 6000 series aluminum alloy medium plate for spinning rims,on the basis of Al-Si-Mg alloy, cu, mn, cr, zn, ti and Fe and other alloy elements are added. The addition of Fe and Cu elements can effectively improve the strength of the alloy, and particularly, the specific mass percentage content of the metal element Cu=0.25-0.35 in the alloy is an important means for adjusting the strength of the finished rim, so that the plasticity and fatigue resistance of the rim are obviously enhanced; the addition of Ti element can refine original crystal grains, and the addition amount of alloy elements Mn, cr and Zn is controlled, so that the tensile strength and the forming performance of the aluminum alloy material in the O treatment state and the T6 treatment state can meet the technical requirements of aluminum for spinning rims. In addition, the aluminum alloy can form various alloy compounds between alloy elements during processing, such as Cu which can be formed between Cu and Mg 2 Mg; tiAl generated by peritectic reaction of Ti in Al 3 And under the control of specific technological process parameters, the surface of the alloy compounds contacted with the liquid metal can become an effective nucleation base surface during aluminum solidification, so that the nucleation rate of the aluminum alloy is increased, the crystallization structure is thinned, the strength of the alloy is obviously improved, and the elongation, the tensile strength and the like are also greatly improved.
2. According to the 6000-series aluminum alloy medium plate for the spinning rim, the components of the alloy and the mass percentage of the components are limited, so that the components are reasonably compatible and comprehensively acted, and the mutual alloying effect is generated, and the comprehensive performance of the Al-Si-Mg alloy material is obviously improved. In the aspect of the preparation process, the casting heat treatment, hot rolling and annealing process parameters are precisely controlled, the cold rolling process is added, the microstructure of the second phase and crystal grains in the aluminum product from the cast ingot to the strip is miniaturized, the crystal grain size of the prepared aluminum alloy medium plate is small, the tensile strength is high, the forming performance is excellent, the plate shape is good, the thickness tolerance is small, the thickness of the finished aluminum plate is 6-8 mm, the crystal grain size is less than or equal to 50 mu m, the second phase size is less than or equal to 10 mu m, the tensile strength is more than or equal to 100MPa, the yield strength is 35-90 MPa, and the elongation is more than or equal to 30%. The rim surface prepared by adopting the aluminum alloy medium plate as the raw material through spinning has no orange peel problem, has excellent comprehensive performance, and well meets the technical requirements of aluminum alloy for rims.
3. According to the preparation process of the 6000-series aluminum alloy medium plate for the spinning rim, the cooling water quantity is regulated and controlled to be 155-162 ㎥/h and the water temperature cooling strength is regulated and controlled to be 30.5-31.2 ℃ in the semi-continuous casting step; the large rolling reduction grain is crushed and dynamically recrystallized in the hot rolling step, so that the finished aluminum alloy with fine grain structure and uniform distribution is obtained, and the technical requirements of the finished aluminum alloy for spinning the hub can be met in the subsequent processes of spinning forming, friction stir welding and surface treatment.
4. According to the preparation process of the 6000-series aluminum alloy medium plate for the spinning rim, after hot rolling treatment, a cold rolling process is added, and the prepared hot rolled plate is subjected to 1-3 times of cold rolling, so that grains of a hot rolled structure are further crushed through multiple times of cold rolling treatment, and the grains of the alloy are fibrous, so that the elongation and the tensile strength of the alloy are improved.
Drawings
FIG. 1 is a grain morphology diagram of the edge of an aluminum alloy ingot in example 1;
FIG. 2 is a grain morphology diagram of the core of the aluminum alloy ingot of example 1;
FIG. 3 is a second phase morphology plot of the aluminum alloy ingot of example 1 prior to heat treatment;
FIG. 4 is a second phase morphology plot of the aluminum alloy ingot of example 1 after heat treatment;
FIG. 5 is a second phase morphology of the medium plate obtained after cold rolling in example 1;
FIG. 6 is a graph showing the morphology of grains of the final aluminum alloy intermediate plate obtained in example 1;
FIG. 7 is a second phase morphology of the hot rolled sheet produced in comparative example 1;
FIG. 8 is a graph showing the morphology of the crystal grains of the final aluminum alloy medium plate produced in comparative example 1.
Detailed Description
The following examples merely illustrate the invention in further detail, but do not constitute any limitation thereof.
The 6000-series aluminum alloy medium plate for the spinning rim comprises the following aluminum alloy raw materials in percentage by weight: main alloy element si=0.45-0.75, mg=0.95-1.15; the content of the trace alloy elements Cu=0.25-0.35, mn=0.04-0.10, cr=0.15-0.30, zn=0.01-0.2, ti=0.02-0.10, the content of Fe element is controlled to be 0.05-0.65, and the balance is Al and unavoidable impurity elements. The thickness of the aluminum alloy medium plate is 6-8 mm, the tolerance is +0.28/-0.02mm, the grain size is less than or equal to 50 mu m, the second phase size is less than or equal to 10 mu m, the tensile strength is more than or equal to 100MPa, the yield strength is 35-90 MPa, and the elongation is more than or equal to 30%.
The preparation method of the 6000-series aluminum alloy medium plate for the spinning rim specifically comprises the following steps:
s1, respectively weighing all components in the aluminum alloy raw materials according to the weight percentage, and adopting a semi-continuous casting method to control the smelting temperature at 740-760 ℃, the casting temperature at 690-710 ℃, the cooling water quantity at 155-162 ㎥/h and the water temperature cooling strength at 30.5-31.2 ℃ during semi-continuous casting to prepare an aluminum alloy cast ingot with the grain size of 95-140 mu m from the core part to the side part for standby;
s2, placing the aluminum alloy ingot produced in the step S1 in an environment with the temperature of 560-570 ℃ for soaking treatment for 8-18 hours, and then naturally cooling to room temperature, wherein a second phase in the aluminum alloy ingot is intermittently distributed along a grain boundary;
step S3, hot rolling the aluminum alloy cast ingot subjected to the heat treatment in the step S2, placing the aluminum alloy cast ingot in an environment with the temperature of 490-520 ℃ for heat treatment for 11-15 hours, and then controlling the initial rolling temperature to be 450-500 ℃ and the final rolling temperature to be more than or equal to 350 ℃ to prepare a hot rolled plate with the final rolling thickness of 8-10 mm for later use;
s4, performing 1-3 times of cold rolling on the hot rolled plate obtained in the step S3 to obtain a medium plate with the thickness of 6-8 mm for later use;
and S5, carrying out annealing treatment at the temperature of more than or equal to 320 ℃ on the medium plate prepared in the step S4, and obtaining the finished product of the aluminum alloy medium plate.
The 6000-series aluminum alloy medium plate for the spinning rim solves the problem that the strength and the forming performance of the conventional 6000-series aluminum material are difficult to meet the technical requirements of the spinning rim. The preparation process increases the cold rolling process by controlling the casting, hot rolling and annealing process parameters, and the prepared aluminum alloy medium plate has the advantages of fine grain size, high tensile strength, excellent forming performance, good shape, small thickness tolerance and capability of meeting the technical requirements of aluminum alloy for spinning rims.
Example 1
A6000 series aluminum alloy medium plate for spinning rims comprises the following raw materials in percentage by weight: si=0.6, fe=0.5, cu=0.28, mn=0.1, mg=1.05, cr=0.2, zn=0.15, ti=0.10, and the balance Al and unavoidable impurities.
The specific preparation method comprises the following steps:
step S1, respectively weighing all the components of the aluminum alloy raw materials in percentage by weight, and then adopting a semi-continuous casting method to control the smelting temperature to 750 ℃ and the casting temperature to 700 ℃ during semi-continuous casting, wherein the cooling water quantity is 160 ㎥/h, the water temperature cooling strength is 30.7 ℃, so as to prepare a flat aluminum alloy cast ingot with the core-to-edge grain size of 98-130 mu m, and the specific grain morphology is shown in the accompanying figures 1 and 2;
step S2, placing the aluminum alloy cast ingot prepared in the step S1 in an environment with the temperature of 560 ℃ for soaking treatment for 12 hours, then naturally cooling to room temperature by air, and changing a second phase in the aluminum alloy cast ingot from continuous distribution to intermittent distribution, wherein the second phase morphology diagrams of the aluminum alloy cast ingot before and after heat treatment are shown in the accompanying figures 3 and 4;
step S3, hot rolling the aluminum alloy cast ingot subjected to the heat treatment in the step S2, placing the aluminum alloy cast ingot in an environment with the temperature of 490 ℃ for heat treatment for 12 hours, and then controlling the initial rolling temperature to be 490 ℃ and the final rolling temperature to be 350 ℃ and obtaining a hot rolled plate with the final rolling thickness of 10mm after 23 times of rolling of the flat aluminum alloy cast ingot with the thickness of 560 mm;
step S4, performing 2-pass cold rolling on the hot rolled plate obtained in the step S3 to obtain a medium plate with the thickness of 8mm, wherein the second phase size is small in the medium plate as shown in FIG. 5;
and S5, carrying out annealing treatment at 330 ℃ on the medium plate prepared in the step S4, as shown in FIG. 6, so as to obtain the finished product of the aluminum alloy medium plate with fine grain size.
The thickness of the aluminum alloy medium plate prepared in the embodiment is 8mm, and the tolerance is +0.03mm. Alloy performance measurements performed thereon showed that: the tensile strength in the annealing treatment state is 119MPa, the yield strength is 70MPa, the elongation is 31%, the grain size is small, and the technical requirement of the high-strength aluminum alloy medium plate for spinning the rim can be better met.
Example 2
A6000 series aluminum alloy medium plate for spinning rims comprises the following raw materials in percentage by weight: si=0.5, fe=0.3, cu=0.31, mn=0.04, mg=0.95, cr=0.15, zn=0.01, ti=0.03, and the balance Al and unavoidable impurities.
The specific preparation method comprises the following steps:
step S1, respectively weighing all the components of the aluminum alloy raw materials in percentage by weight, and then adopting a semi-continuous casting method to control the smelting temperature at 740 ℃ and the casting temperature at 710 ℃ during semi-continuous casting, wherein the cooling water quantity is 155 ㎥/h, the water temperature cooling strength is 31 ℃, so as to prepare a flat aluminum alloy cast ingot with the core part and the edge grain size of 100-126 mu m for later use;
s2, placing the aluminum alloy cast ingot prepared in the step S1 in an environment with the temperature of 570 ℃ for soaking treatment for 8 hours, and then naturally cooling to room temperature, wherein a second phase in the aluminum alloy cast ingot is changed from continuous distribution to intermittent distribution;
step S3, hot rolling the aluminum alloy cast ingot subjected to the heat treatment in the step S2, placing the aluminum alloy cast ingot in an environment with the temperature of 500 ℃ for heat treatment for 13 hours, controlling the initial rolling temperature to 470 ℃ and the final rolling temperature to 360 ℃, and rolling the flat aluminum alloy cast ingot for 20 times to obtain a hot rolled plate with the final rolling thickness of 10mm for later use;
s4, performing 2-pass cold rolling on the hot rolled plate obtained in the step S3 to obtain a medium plate with the thickness of 8mm for later use;
and S5, carrying out 330 ℃ annealing treatment on the medium plate obtained in the step S4 to obtain the finished product of the aluminum alloy medium plate.
The thickness of the aluminum alloy medium plate prepared in the embodiment is 8mm, and the tolerance is +0.07mm. Alloy performance measurements performed thereon showed that: the tensile strength in the annealing treatment state is 110MPa, the yield strength is 52MPa, the elongation is 30%, and the grain size is fine, so that the technical requirement of the high-strength aluminum alloy medium plate for spinning the rim can be better met.
Example 3
A6000 series aluminum alloy medium plate for spinning rims comprises the following raw materials in percentage by weight: si=0.45, fe=0.65, cu=0.25, mn=0.07, mg=1.00, cr=0.25, zn=0.18, ti=0.02, and the balance Al and unavoidable impurities.
The specific preparation method comprises the following steps:
step S1, respectively weighing all the components of the aluminum alloy raw materials in percentage by weight, and then adopting a semi-continuous casting method to control the smelting temperature at 740-760 ℃ during semi-continuous casting, the casting temperature at 690 ℃, the cooling water quantity at 162 ㎥/h and the water temperature cooling strength at 31.2 ℃ to prepare a flat aluminum alloy cast ingot with 97-135 mu m of core-to-edge grain size for later use;
s2, placing the aluminum alloy cast ingot prepared in the step S1 in an environment with the temperature of 565 ℃ for soaking treatment for 10 hours, and then naturally cooling to room temperature by air, wherein a second phase in the aluminum alloy cast ingot is changed from continuous distribution to intermittent distribution;
step S3, hot rolling the aluminum alloy cast ingot subjected to the heat treatment in the step S2, placing the aluminum alloy cast ingot in a temperature environment with the temperature of 510 ℃ for heat treatment for 15 hours, controlling the initial rolling temperature to be 450 ℃ and the final rolling temperature to be 370 ℃, and rolling the flat aluminum alloy cast ingot for 25 times to obtain a hot rolled plate with the final rolling thickness of 8mm for later use;
s4, performing 3-pass cold rolling on the hot rolled plate obtained in the step S3 to obtain a medium plate with the thickness of 6mm for later use;
and S5, carrying out 320 ℃ annealing treatment on the medium plate obtained in the step S4 to obtain the finished product of the aluminum alloy medium plate.
The thickness of the aluminum alloy medium plate prepared in the embodiment is 6mm, and the tolerance is +0.02mm. Alloy performance measurements performed thereon showed that: the tensile strength in the annealing treatment state is 152MPa, the yield strength is 71MPa, the elongation is 35%, and the grain size is fine, so that the technical requirement of the high-strength aluminum alloy medium plate for spinning the rim can be better met.
Example 4
A6000 series aluminum alloy medium plate for spinning rims comprises the following raw materials in percentage by weight: si=0.75, fe=0.05, cu=0.35, mn=0.09, mg=1.15, cr=0.30, zn=0.2, ti=0.08, and the balance Al and unavoidable impurities.
The specific preparation method comprises the following steps:
step S1, respectively weighing all the components of the aluminum alloy raw materials in percentage by weight, and then adopting a semi-continuous casting method to control the smelting temperature to 760 ℃ during semi-continuous casting, the casting temperature to 705 ℃, the cooling water quantity to 158 ㎥/h and the water temperature cooling strength to 30.5 ℃ to prepare a flat aluminum alloy cast ingot with the core to edge grain size of 99-138 mu m for later use;
s2, placing the aluminum alloy cast ingot prepared in the step S1 in an environment with the temperature of 570 ℃ for soaking treatment for 11 hours, and then naturally cooling to room temperature, wherein a second phase in the aluminum alloy cast ingot is changed from continuous distribution to intermittent distribution;
step S3, hot rolling the aluminum alloy cast ingot subjected to the heat treatment in the step S2, placing the aluminum alloy cast ingot in an environment with the temperature of 520 ℃ for heat treatment for 11 hours, controlling the initial rolling temperature to be 500 ℃ and the final rolling temperature to be 350 ℃, and rolling the flat aluminum alloy cast ingot for 22 times to obtain a hot rolled plate with the final rolling thickness of 9mm for later use;
s4, performing 3-pass cold rolling on the hot rolled plate obtained in the step S3 to obtain a medium plate with the thickness of 7mm for later use;
and S5, carrying out 350 ℃ annealing treatment on the medium plate obtained in the step S4 to obtain the finished product of the aluminum alloy medium plate.
The thickness of the aluminum alloy medium plate prepared in the embodiment is 7mm, and the tolerance is +0.05mm. Alloy performance measurements performed thereon showed that: the tensile strength in the annealing treatment state is 139MPa, the yield strength is 83MPa, the elongation is 33%, and the grain size is fine, so that the technical requirement of the high-strength aluminum alloy medium plate for spinning the rim can be better met.
Comparative example 1
A6000 series aluminum alloy medium plate for spinning rims, the alloy composition of the raw materials is the same as in example 1.
The specific preparation method comprises the following steps:
step S1, respectively weighing all the components of the aluminum alloy raw materials in percentage by weight, and then adopting smelting and semi-continuous casting methods to prepare a flat aluminum alloy cast ingot for later use;
s2, placing the aluminum alloy cast ingot prepared in the step S1 in an environment with the temperature of 560 ℃ for soaking treatment for 12 hours, and then naturally cooling to room temperature;
step S3, hot rolling the aluminum alloy cast ingot subjected to the heat treatment in the step S2, placing the aluminum alloy cast ingot in an environment with the temperature of 490 ℃ for heat treatment for 12 hours, and then controlling the initial rolling temperature to 490 ℃ and the final rolling temperature to 330 ℃ to obtain a hot rolled plate with the final rolling thickness of 8mm, wherein the appearance of the hot rolled plate prepared in the embodiment is shown in a figure 7, and the second phase size of the alloy is small but uneven in distribution as can be seen in the figure 7;
and S4, annealing treatment, wherein the annealing temperature is controlled to be 360 ℃, and the finished aluminum alloy medium plate with coarse grain size is obtained as shown in figure 8.
The thickness of the aluminum alloy medium plate prepared in the embodiment is 8mm, the tolerance is +0.24mm, and the alloy performance measurement shows that: the tensile strength of the annealed state is 96MPa, the yield strength is 34MPa, the elongation is 21%, the grain size is coarse, and the technical requirement of the high-strength aluminum alloy medium plate for spinning hubs cannot be met.
Claims (7)
1. A6000-series aluminum alloy medium plate for spinning rims is characterized in that the aluminum alloy raw material of the aluminum alloy medium plate comprises the following components in percentage by weight: si=0.45 to 0.75, fe=0.05 to 0.65, cu=0.25 to 0.35, mn=0.04 to 0.10, mg=0.95 to 1.15, cr=0.15 to 0.30, zn=0.01 to 0.2, ti=0.02 to 0.10, and the balance Al and unavoidable impurity elements.
2. A 6000-series aluminum alloy medium plate for spinning rims according to claim 1, wherein: the thickness of the aluminum alloy medium plate is 6-8 mm, the tolerance is +0.28/-0.02mm, the grain size is less than or equal to 50 mu m, the second phase size is less than or equal to 10 mu m, the tensile strength is more than or equal to 100MPa, the yield strength is 35-90 MPa, and the elongation is more than or equal to 30%.
3. The method for manufacturing a 6000-series aluminum alloy medium plate for spinning rims according to claim 1, comprising the steps of:
s1, respectively weighing all components in the aluminum alloy raw materials according to the weight percentage, and adopting a semi-continuous casting method to control the cooling water quantity to be 155-162 ㎥/h and the water temperature cooling strength to be 30.5-31.2 ℃ during semi-continuous casting to prepare an aluminum alloy cast ingot for later use;
s2, performing heat treatment on the aluminum alloy cast ingot prepared in the step S1;
step S3, hot rolling the aluminum alloy cast ingot subjected to the heat treatment in the step S2 to obtain a hot rolled plate for later use;
s4, performing 1-3 times of cold rolling on the hot rolled plate obtained in the step S3 to obtain a medium plate with the thickness of 6-8 mm for later use;
and S5, carrying out annealing treatment on the medium plate obtained in the step S4 to obtain the finished product of the aluminum alloy medium plate.
4. A method for producing a 6000 series aluminum alloy medium plate for spinning rims according to claim 3, wherein: in the step S1, the smelting temperature in the semi-continuous casting is 740-760 ℃, the casting temperature in the semi-continuous casting is 690-710 ℃, and the grain size from the core part to the edge part of the aluminum alloy ingot after the semi-continuous casting is 95-140 mu m.
5. A method for producing a 6000 series aluminum alloy medium plate for spinning rims according to claim 3, wherein: in the step S2, the specific operation during the heat treatment is that the aluminum alloy cast ingot is placed in an environment with the temperature of 560-570 ℃ for soaking treatment for 8-18 h, and then naturally cooled to room temperature.
6. A method for producing a 6000 series aluminum alloy medium plate for spinning rims according to claim 3, wherein: in the step S3, the specific operation during the hot rolling treatment is that an aluminum alloy ingot is placed in an environment with the temperature of 490-520 ℃ for heating treatment for 11-15 h, and then the initial rolling temperature is controlled to be 450-500 ℃, and the final rolling temperature is controlled to be more than or equal to 350 ℃, so that a hot rolled plate with the final rolling thickness of 8-10 mm is obtained.
7. A method for producing a 6000 series aluminum alloy medium plate for spinning rims according to claim 3, wherein: in the step S5, the annealing temperature in the annealing treatment is more than or equal to 320 ℃.
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| KR20080001328A (en) * | 2006-06-29 | 2008-01-03 | (주)알루텍 | Al-alloy for forging |
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| KR20080001328A (en) * | 2006-06-29 | 2008-01-03 | (주)알루텍 | Al-alloy for forging |
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