CN111057885A - Manufacturing method of aluminum alloy strip with improved punched flanging height - Google Patents
Manufacturing method of aluminum alloy strip with improved punched flanging height Download PDFInfo
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- CN111057885A CN111057885A CN201911384134.7A CN201911384134A CN111057885A CN 111057885 A CN111057885 A CN 111057885A CN 201911384134 A CN201911384134 A CN 201911384134A CN 111057885 A CN111057885 A CN 111057885A
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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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- 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
- B21C37/04—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of bars or wire
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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
- 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
The invention relates to a manufacturing method of an aluminum alloy strip for improving the height of a punched flanging, which aims to solve the problem that the height of the punched flanging of the aluminum alloy strip manufactured by the existing method is lower. The manufacturing method comprises the following steps: firstly, smelting raw materials; secondly, casting and forming an aluminum alloy solution; thirdly, heating the aluminum alloy cast ingot; fourthly, hot rolling the heated aluminum alloy cast ingot to the thickness of 5.0 mm; fifthly, cold rolling the blank; sixthly, placing the cold-rolled intermediate blank into a furnace for annealing; seventhly, cold rolling the strip subjected to intermediate annealing; eighthly, placing the cold-rolled strip into a furnace, and carrying out final annealing, wherein the temperature of furnace gas is fixed at 330-360 ℃, and heating is carried out for 14-16 hours. The invention adopts novel Al-Mg alloy, determines the influence of the cold rolling processing rate and the annealing temperature of the finished product on the flanging height by controlling the processes of hot rolling, annealing and the like, and ensures that the product can meet the requirement of a user on the flanging height after punching.
Description
Technical Field
The invention relates to a manufacturing method of an aluminum alloy strip.
Background
The heat exchange belt of the air conditioner is generally made of aluminum alloy strips, the height of the turned edge is an important index for heat exchange fin products, the higher the height of the turned edge is, the fewer corresponding fins are overlapped, the heat exchange efficiency can be greatly increased, and the cost is saved. And the larger height of the punched flanging has high requirements on the comprehensive mechanical properties, especially anisotropy, of the material.
However, the conventional aluminum alloy strip has a low flanging height and is difficult to meet the user requirements, so that the aluminum alloy strip with the flanging height improved by punching needs to be developed and used for the air conditioner fins.
Disclosure of Invention
The invention aims to solve the problem that the punched flanging height of the aluminum alloy strip manufactured by the existing method is low, and provides a manufacturing method of the aluminum alloy strip with the punching flanging height improved.
The manufacturing method of the aluminum alloy strip for improving the punching flanging height is realized according to the following steps:
firstly, smelting raw materials comprising 0.2 wt% of Mn, 2.6-2.8 wt% of Mg, 0.03 wt% of Si, 0.1 wt% of Fe and the balance of Al (high-purity aluminum) to obtain an aluminum alloy solution;
secondly, casting the aluminum alloy solution obtained in the first step to prepare an aluminum alloy ingot under the conditions that the casting temperature is 680-720 ℃, the casting speed is 55-60 mm/min, the casting cooling water pressure is 0.003-0.1 Mpa, and the cooling water temperature is 20-26 ℃;
thirdly, heating the aluminum alloy ingot obtained in the second step, wherein the heating system is that the furnace gas is at the constant temperature of 560 ℃, heating for 5-6 h, and then heating for 28-30 h at the temperature of 470 ℃ to obtain a heated aluminum alloy ingot;
fourthly, hot rolling the heated aluminum alloy ingot to the thickness of 5.0mm to obtain a hot rolled blank;
fifthly, cooling the hot rolled blank to room temperature, and performing cold rolling to 1.38-1.42 mm to obtain a cold rolled intermediate blank;
sixthly, placing the cold-rolled intermediate blank into a furnace for annealing, controlling the annealing temperature to be 320-330 ℃, preserving the heat for 0.8-1.2 hours, discharging from the furnace, and air-cooling to room temperature to obtain a strip after intermediate annealing;
seventhly, cold rolling the strip subjected to intermediate annealing to a finished product thickness to obtain a cold-rolled strip;
and eighthly, placing the cold-rolled strip into a furnace, and carrying out final annealing, wherein the temperature of furnace gas is fixed at 330-360 ℃, and heating for 14-16 hours to obtain the aluminum alloy strip with the height of the punched flanging increased.
The novel Al-Mg alloy is adopted, 2.6-2.8% of Mg is added into a high-precision aluminum ingot for casting, the influence of the cold rolling processing rate and the annealing temperature of a finished product on the flanging height is determined by controlling the processes of hot rolling, annealing and the like, technical parameters are provided for large-scale production, the control difficulty is relatively low, the product quality is stable, the requirement of a user on the flanging height after punching can be met, and the aluminum alloy prepared by the invention is subjected to a reaming testThe tensile strength of the gold strip is 200-220N/mm2The yield strength is 100-110N/mm2The elongation is 18.8-20.2%, and the tensile strength required by the cup burst is 6.5-7.0 and is 190-240N/mm2The yield strength is more than or equal to 80N/mm2The elongation is more than or equal to 18 percent, and the problem of lower flanging height after the aluminum alloy strip prepared by the existing method is punched is solved.
Drawings
FIG. 1 is a photograph of the high magnification structure of the aluminum alloy strip after annealing at 330 ℃ in example II;
FIG. 2 is a photograph of the high magnification microstructure of the aluminum alloy strip after annealing at 340 deg.C of example III;
FIG. 3 is a photograph of the high magnification microstructure of the example one aluminum alloy strip after 350 ℃ annealing;
FIG. 4 is a photograph of the high magnification microstructure of the aluminum alloy strip after four 360 ℃ annealing in the example.
Detailed Description
The first embodiment is as follows: the manufacturing method of the aluminum alloy strip for improving the punching flanging height is implemented according to the following steps:
firstly, smelting raw materials comprising 0.2 wt% of Mn, 2.6-2.8 wt% of Mg, 0.03 wt% of Si, 0.1 wt% of Fe and the balance of Al (high-purity aluminum) to obtain an aluminum alloy solution;
secondly, casting the aluminum alloy solution obtained in the first step to prepare an aluminum alloy ingot under the conditions that the casting temperature is 680-720 ℃, the casting speed is 55-60 mm/min, the casting cooling water pressure is 0.003-0.1 Mpa, and the cooling water temperature is 20-26 ℃;
thirdly, heating the aluminum alloy ingot obtained in the second step, wherein the heating system is that the furnace gas is at the constant temperature of 560 ℃, heating for 5-6 h, and then heating for 28-30 h at the temperature of 470 ℃ to obtain a heated aluminum alloy ingot;
fourthly, hot rolling the heated aluminum alloy ingot to the thickness of 5.0mm to obtain a hot rolled blank;
fifthly, cooling the hot rolled blank to room temperature, and performing cold rolling to 1.38-1.42 mm to obtain a cold rolled intermediate blank;
sixthly, placing the cold-rolled intermediate blank into a furnace for annealing, controlling the annealing temperature to be 320-330 ℃, preserving the heat for 0.8-1.2 hours, discharging from the furnace, and air-cooling to room temperature to obtain a strip after intermediate annealing;
seventhly, cold rolling the strip subjected to intermediate annealing to a finished product thickness to obtain a cold-rolled strip;
and eighthly, placing the cold-rolled strip into a furnace, and carrying out final annealing, wherein the temperature of furnace gas is fixed at 330-360 ℃, and heating for 14-16 hours to obtain the aluminum alloy strip with the height of the punched flanging increased.
In the first step of this embodiment, the weight percentage of Si impurity in the raw material is less than 0.1%, the weight percentage of Fe is less than 0.15%, the weight percentage of Zn impurity is less than 0.01%, and the weight percentage of Ni impurity is less than 0.01%.
The aluminum alloy strip prepared by the embodiment is suitable for air conditioner fins, has a heat exchange effect, has a high requirement on the flanging height after deep drawing in order to save cost and increase heat exchange efficiency, adopts Al-Mg alloy, adopts high-precision aluminum ingots for casting to add 2.6-2.8% of Mg, determines a production process of the aluminum alloy strip with the high-punching flanging height by controlling the processes of hot rolling, cold rolling, annealing and the like, ensures the flanging height of the aluminum strip, and produces the aluminum strip meeting the use requirement of a user.
The second embodiment is as follows: the present embodiment is different from the first embodiment in that 0.2 wt% of Mn, 2.66 wt% of Si, 0.03 wt% of Fe, and the balance of Al (high refined aluminum) are used as raw materials in the first step.
The third concrete implementation mode: the embodiment is different from the first or second embodiment in that the aluminum alloy ingot is made in the second step under the conditions that the casting temperature is 690 ℃, the casting speed is 55mm/min, the casting cooling water pressure is 0.006Mpa, and the cooling water temperature is 24 ℃.
The fourth concrete implementation mode: the difference between the embodiment and one of the first to third embodiments is that the heating system in the third step is that the furnace gas is heated at a constant temperature of 560 ℃ for 5.5h and then at a temperature of 470 ℃ for 29 h.
The fifth concrete implementation mode: the difference between this embodiment and one of the first to fourth embodiments is that the annealing temperature is controlled to 330 ℃ in the sixth step, and the temperature is maintained for 1 hour.
The sixth specific implementation mode: the present embodiment is different from the first to fifth embodiments in that the cold rolling deformation reduction ratio is controlled to 76% to 80% in step seven.
The seventh embodiment: the difference between this embodiment and the first to sixth embodiments is that the thickness of the finished product is 0.3mm in step seven.
The specific implementation mode is eight: the difference between the embodiment and one of the first to seventh embodiments is that the temperature of the furnace gas in the step eight is 350 ℃, and the furnace gas is heated for 15 hours.
In the embodiment, in order to improve the flanging height of a product, the internal structure of the material is required to reach the texture balance, the aluminum alloy mainly has a deformation texture and a recrystallization texture, and the larger the cold deformation degree is, the larger the tendency of forming the deformation texture is; and the annealing mainly converts the deformation texture generated by cold deformation into a cubic texture, and tests prove that: the 78% cold deformation processing rate is matched with the annealing temperature of 350 ℃, the cupping value of the product is the highest, the anisotropy is the lowest, and the texture tends to be balanced.
The first embodiment is as follows: the manufacturing method of the aluminum alloy strip with the punching flanging height improved in the embodiment is implemented according to the following steps:
firstly, taking high-precision aluminum with 0.2 percent of Mn, 2.66 percent of Mg and the balance of Al as raw materials, wherein the weight percent of impurity Si in the raw materials is less than 0.1 percent, the weight percent of Fe is less than 0.15 percent, the weight percent of impurity Zn is less than 0.01 percent, and the weight percent of impurity Ni is less than 0.01 percent, smelting the raw materials to obtain an aluminum alloy solution;
secondly, casting the aluminum alloy solution obtained in the first step to prepare an aluminum alloy ingot under the conditions that the casting temperature is 690 ℃, the casting speed is 55mm/min, the casting cooling water pressure is 0.006Mpa and the cooling water temperature is 24 ℃;
thirdly, heating the aluminum alloy ingot obtained in the second step, wherein the heating system is that the furnace gas is fixed at 560 ℃, heating is carried out for 5.5 hours, and then heating is carried out for 29 hours at 470 ℃, so as to obtain a heated aluminum alloy ingot;
fourthly, discharging the heated aluminum alloy ingot out of the furnace, rolling the aluminum alloy ingot to a thickness of 5.0mm, and obtaining a hot rolled blank;
fifthly, cooling the hot rolled blank to room temperature, and cold rolling the hot rolled blank to 1.4±0.02mm, obtaining a cold-rolled intermediate blank;
sixthly, placing the cold-rolled intermediate blank into a furnace for annealing, controlling the annealing temperature to be 320 ℃, preserving the heat for 1 hour, discharging the blank out of the furnace, and air-cooling the blank to room temperature to obtain a strip after intermediate annealing;
seventhly, cold rolling the strip subjected to intermediate annealing until the thickness of a finished product is 0.3mm to obtain a cold-rolled strip;
and eighthly, placing the cold-rolled strip into a furnace, and carrying out final annealing, wherein the constant temperature of furnace gas is 350 ℃, and heating for 15 hours to obtain the aluminum alloy strip with the punching flanging height improved.
In the embodiment, the anisotropy of the aluminum alloy strip is improved by controlling the cold rolling reduction rate and matching the final annealing temperature, so that the flanging height of the aluminum alloy strip product is increased.
Example two: the difference between the embodiment and the first embodiment is that the temperature of furnace gas is fixed at 330 ℃ in the step eight system, and the heating is carried out for 15 hours.
Example three: the difference between the embodiment and the first embodiment is that the temperature of furnace gas is fixed at 340 ℃ in the step eight system, and the heating is carried out for 15 hours.
Example four: the difference between the embodiment and the first embodiment is that the temperature of furnace gas is fixed at 360 ℃ in the step eight system, and the heating is carried out for 15 hours.
High magnification photographs of the aluminum alloy strips produced in examples one through four are shown in fig. 1-4. The high magnification structure photograph shows that the aluminum alloy structure has been completely recrystallized.
The aluminum alloy strip produced in example one was sampled and subjected to mechanical property testing (see table 1).
Table 1 results of mechanical property measurements of the first prepared aluminum alloy strip
As can be seen from Table 1, the tensile strength of the first embodiment is 190-240N/mm2The yield strength is more than or equal to 80N/mm2The elongation is more than or equal to 18 percent.
Claims (8)
1. A manufacturing method of an aluminum alloy strip for improving the height of a punched flanging is characterized by comprising the following steps:
firstly, smelting raw materials comprising 0.2 wt% of Mn, 2.6-2.8 wt% of Mg, 0.03 wt% of Si, 0.1 wt% of Fe and the balance of Al to obtain an aluminum alloy solution;
secondly, casting the aluminum alloy solution obtained in the first step to prepare an aluminum alloy ingot under the conditions that the casting temperature is 680-720 ℃, the casting speed is 55-60 mm/min, the casting cooling water pressure is 0.003-0.1 Mpa, and the cooling water temperature is 20-26 ℃;
thirdly, heating the aluminum alloy ingot obtained in the second step, wherein the heating system is that the furnace gas is at the constant temperature of 560 ℃, heating for 5-6 h, and then heating for 28-30 h at the temperature of 470 ℃ to obtain a heated aluminum alloy ingot;
fourthly, hot rolling the heated aluminum alloy ingot to the thickness of 5.0mm to obtain a hot rolled blank;
fifthly, cooling the hot rolled blank to room temperature, and performing cold rolling to 1.38-1.42 mm to obtain a cold rolled intermediate blank;
sixthly, placing the cold-rolled intermediate blank into a furnace for annealing, controlling the annealing temperature to be 320-330 ℃, preserving the heat for 0.8-1.2 hours, discharging from the furnace, and air-cooling to room temperature to obtain a strip after intermediate annealing;
seventhly, cold rolling the strip subjected to intermediate annealing to a finished product thickness to obtain a cold-rolled strip;
and eighthly, placing the cold-rolled strip into a furnace, carrying out final annealing, controlling the constant temperature of furnace gas to be 330-360 ℃, and heating for 14-16 hours to obtain the aluminum alloy strip with the punching flanging height improved.
2. The method for manufacturing the aluminum alloy strip with the punching flanging height improved according to claim 1, wherein in the step one, 0.2% of Mn, 2.66% of Si, 0.03% of Fe and the balance of Al are used as raw materials.
3. The method for manufacturing the aluminum alloy strip with the improved punched flanging height according to claim 1, wherein the aluminum alloy ingot is manufactured in the second step under the conditions that the casting temperature is 690 ℃, the casting speed is 55mm/min, the casting cooling water pressure is 0.006Mpa, and the cooling water temperature is 24 ℃.
4. The method for manufacturing the aluminum alloy strip with the punching flanging height improved according to claim 1, is characterized in that a heating system in the third step is that furnace gas is heated at a constant temperature of 560 ℃ for 5.5 hours and then heated at a temperature of 470 ℃ for 29 hours.
5. The manufacturing method of the aluminum alloy strip with the punching flanging height improved according to claim 1, characterized in that in the sixth step, the annealing temperature is controlled to be 330 ℃, and the temperature is kept for 1 hour.
6. The manufacturing method of the aluminum alloy strip with the punching flanging height improved according to claim 1, wherein the cold rolling deformation reduction rate in the seventh step is controlled to be 76-80%.
7. The manufacturing method of the aluminum alloy strip with the improved punched flanging height as claimed in claim 1, wherein the thickness of the finished product is 0.3mm in the seventh step.
8. The manufacturing method of the aluminum alloy strip with the punching flanging height improved according to claim 1, characterized in that in the eighth step, the furnace gas is controlled to be at the constant temperature of 350 ℃ and heated for 15 hours.
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| CN201911384134.7A CN111057885A (en) | 2019-12-28 | 2019-12-28 | Manufacturing method of aluminum alloy strip with improved punched flanging height |
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| CN201911384134.7A CN111057885A (en) | 2019-12-28 | 2019-12-28 | Manufacturing method of aluminum alloy strip with improved punched flanging height |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112934980A (en) * | 2021-03-09 | 2021-06-11 | 中铝河南洛阳铝加工有限公司 | Processing method of 1050 aluminum alloy medicine cover material |
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| CN104093869A (en) * | 2012-02-09 | 2014-10-08 | 株式会社神户制钢所 | Aluminum alloy sheet for DI can body |
| WO2014107188A1 (en) * | 2013-01-07 | 2014-07-10 | Golden Aluminum Company | Used beverage container aluminum composition and method |
| JP2016041852A (en) * | 2015-10-05 | 2016-03-31 | 株式会社神戸製鋼所 | Aluminum alloy sheet for can barrel |
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| CN112934980A (en) * | 2021-03-09 | 2021-06-11 | 中铝河南洛阳铝加工有限公司 | Processing method of 1050 aluminum alloy medicine cover material |
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Application publication date: 20200424 |