CN111394625A - Composite finned aluminum strip for air cooling of power station and preparation method thereof - Google Patents
Composite finned aluminum strip for air cooling of power station and preparation method thereof Download PDFInfo
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- CN111394625A CN111394625A CN202010304663.8A CN202010304663A CN111394625A CN 111394625 A CN111394625 A CN 111394625A CN 202010304663 A CN202010304663 A CN 202010304663A CN 111394625 A CN111394625 A CN 111394625A
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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
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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
- B21C37/02—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of sheets
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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
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Abstract
The invention discloses a composite fin aluminum strip for power station air cooling and a preparation method thereof, wherein the aluminum strip comprises a core material and skin materials compounded on the upper surface and the lower surface of the core material, and the skin materials are 4343 alloy; the preparation method comprises the following steps: preparing core material components according to mass percentage; the components are cast and rolled to obtain a core material cast and rolled coil with the thickness of 6.5-7.5 mm; processing the core material cast-rolled coil to obtain a core material semi-finished product with the thickness of 4.0 mm; carrying out heat treatment on the core material semi-finished product to obtain a core material; laying 4343 alloy skin materials on the upper and lower surfaces of the core material, and performing cold rolling and compounding to obtain a composite plate with the thickness of 2.2-2.8 mm; rolling the composite plate to the thickness of 0.2-0.3mm, and transferring into an annealing furnace for annealing. The aluminum strip provided by the invention has the advantages of high support strength after brazing, good collapse resistance, short production period and high production efficiency, and can effectively reduce the production cost.
Description
Technical Field
The invention belongs to the technical field of metal material processing and forming, and particularly relates to a composite finned aluminum strip for power station air cooling and a preparation method thereof.
Background
The existing air cooling fins of the power station are mostly processed by 3003 alloy, and the traditional 3003 alloy has low strength after welding, poorer collapse resistance, long production period and high production cost.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides the composite finned aluminum strip for the air cooling of the power station and the preparation method thereof.
The invention provides the following technical scheme:
the composite finned aluminum strip for air cooling in the power station comprises a core material and skin materials compounded on the upper surface and the lower surface of the core material, wherein the skin materials are 4343 alloy, and the core material comprises the following components in percentage by mass: 0.2-0.35% of silicon, 0.3-0.55% of iron, 0.5-0.7% of copper, 0.65-1.0% of manganese, 0.1-0.3% of magnesium, 0.05-0.1% of zinc and the balance of aluminum.
A preparation method of a composite finned aluminum strip for air cooling of a power station comprises the following steps:
preparing core material components according to mass percentage;
the components are cast and rolled to obtain a core material cast and rolled coil with the thickness of 6.5-7.5 mm;
processing the core material cast-rolled coil to obtain a core material semi-finished product with the thickness of 4.0 mm;
carrying out heat treatment on the core material semi-finished product to obtain a core material;
laying 4343 alloy skin materials on the upper and lower surfaces of the core material, and performing cold rolling and compounding to obtain a composite plate with the thickness of 2.2-2.8 mm;
and rolling the composite plate to the thickness of 0.2-0.3mm, and transferring the composite plate into an annealing furnace to perform finished product annealing to obtain the composite finned aluminum strip for air cooling of the power station.
Preferably, the core material cast-rolling coil is processed according to the processing rate of 38-50% to obtain a core material semi-finished product.
Preferably, the method for performing heat treatment on the core material semi-finished product comprises the following steps: raising the temperature to 610 ℃ at the temperature raising rate of 60-85 ℃/h, preserving the heat for 12-16h, then lowering the temperature to 400 ℃ at the temperature lowering rate of 360 ℃ at the temperature lowering rate of 30 ℃/h, preserving the heat for 5h, and then discharging from the furnace for air cooling.
Preferably, the thickness of the laid 4343 alloy skin material is 0.5-0.85 mm.
Preferably, the core material and the 4343 alloy skin material are cold-rolled and compounded according to the coating rate of 10-15%.
Preferably, the rolling of the composite plate includes rough rolling, finishing and finish rolling.
Compared with the prior art, the invention has the beneficial effects that:
(1) the tensile strength of the composite fin aluminum strip prepared by the invention is 180-200MPa, a finished product sample is placed in a muffle furnace to simulate brazing at the temperature of 600 ℃/10min, and the tensile strength is more than 130MPa, which shows that the support strength is good after high-temperature brazing;
(2) the composite fin aluminum strip comprises a core material and skin materials compounded on the upper surface and the lower surface of the core material, wherein the skin materials are 4343 alloy, the copper content of the core material is increased compared with that of a common 3003 composite air cooling fin, and a proper amount of magnesium is added, so that the strength after welding is greatly improved, and therefore, the support strength of the prepared composite fin aluminum strip finished product after brazing is improved, the collapse resistance is improved, the thickness of the material can be effectively reduced, the assembly process can be effectively simplified, and the welding sheet laying process is reduced;
(3) the preparation method of the composite fin aluminum strip provided by the invention has the advantages that the production period is short, the production efficiency is high, the production cost can be effectively reduced, and the coating rate of an aluminum foil material is more stable;
drawings
FIG. 1 is a flow chart of the production of a composite finned aluminum strip for air cooling in a power station.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
Example 1
The preparation method of the composite finned aluminum strip for air cooling of the power station according to the flow shown in the figure 1 comprises the following steps:
preparing a 4343 alloy skin material through the working procedures of conventional smelting, casting and rolling and the like;
preparing core material components according to the mass percentage of 0.2 percent of silicon, 0.3 percent of iron, 0.5 percent of copper, 0.65 percent of manganese, 0.1 percent of magnesium, 0.05 percent of zinc and the balance of aluminum;
the components are cast and rolled to obtain a core material cast and rolled coil with the thickness of 6.5 mm;
processing the core material cast-rolled coil according to the processing rate of 38.4% to obtain a core material semi-finished product with the thickness of 4.0 mm;
carrying out heat treatment on the core material semi-finished product to obtain a core material, which specifically comprises the following steps: firstly heating to 550 ℃ according to the heating rate of 60 ℃/h, preserving heat for 16h, then cooling to 360 ℃ according to the cooling rate of 30 ℃/h, preserving heat for 5h, and then discharging from the furnace and air cooling;
laying 4343 alloy skin materials with the thickness of 0.5mm on the upper and lower surfaces of the core material, and performing cold rolling compounding according to the coating rate of 10% to obtain a composite plate with the thickness of 2.2 mm;
and (3) roughly rolling, finishing and finish rolling the composite plate until the thickness is 0.2mm, transferring the composite plate into an annealing furnace to anneal a finished product, thus obtaining the composite finned aluminum strip for air cooling of the power station, and subsequently slitting and packaging the composite finned aluminum strip according to requirements.
Taking the prepared composite finned aluminum strip finished product for power station air cooling to detect the mechanical property; and then placing the finished product of the composite finned aluminum strip for air cooling in the power station into a muffle furnace for simulated brazing (process: 600 ℃/10min), preparing a sample according to the sample preparation requirement, and detecting the mechanical property, wherein the result is shown in the following table 1.
Table 1 composite finned aluminum strip finished product in example 1 and its mechanical properties after simulated welding
As can be seen from table 1, the tensile strength of the composite finned aluminum strip for power station air cooling prepared in example 1 was 183MPa, and the tensile strength after pseudo welding was 139MPa, indicating that the support strength after high-temperature brazing was good.
Example 2
The preparation method of the composite finned aluminum strip for air cooling of the power station according to the flow shown in the figure 1 comprises the following steps:
preparing a 4343 alloy skin material through the working procedures of conventional smelting, casting and rolling and the like;
preparing core material components according to the mass percentage of 0.28 percent of silicon, 0.4 percent of iron, 0.6 percent of copper, 0.8 percent of manganese, 0.2 percent of magnesium, 0.08 percent of zinc and the balance of aluminum;
the components are cast and rolled to obtain a core material cast and rolled coil with the thickness of 7.0 mm;
the core material cast-rolled coil is processed according to the processing rate of 42.8% to obtain a core material semi-finished product with the thickness of 4.0 mm;
carrying out heat treatment on the core material semi-finished product to obtain a core material, which specifically comprises the following steps: heating to 580 ℃ according to the heating rate of 75 ℃/h, preserving heat for 14h, cooling to 380 ℃ according to the cooling rate of 30 ℃/h, preserving heat for 5h, and then discharging from the furnace and air cooling;
laying 4343 alloy skin materials with the thickness of 0.7mm on the upper and lower surfaces of the core material, and performing cold rolling compounding according to the cladding rate of 12.9% to obtain a composite plate with the thickness of 2.5 mm;
and (3) roughly rolling, finishing and finish rolling the composite plate until the thickness is 0.25mm, transferring the composite plate into an annealing furnace to anneal a finished product, thus obtaining the composite finned aluminum strip for air cooling of the power station, and subsequently slitting and packaging the composite finned aluminum strip according to requirements.
Taking the prepared composite finned aluminum strip finished product for power station air cooling to detect the mechanical property; and then placing the finished product of the composite finned aluminum strip for air cooling in the power station into a muffle furnace for simulated brazing (process: 600 ℃/10min), preparing a sample according to the sample preparation requirement, and detecting the mechanical property, wherein the result is shown in the following table 2.
Table 2 composite finned aluminum strip finished product and its simulated post-weld mechanical properties in example 2
As can be seen from table 2, the tensile strength of the composite finned aluminum strip for power station air cooling prepared in example 2 was 190MPa, and the tensile strength after simulated welding was 151MPa, indicating that the support strength after high-temperature brazing was good.
Example 3
The preparation method of the composite finned aluminum strip for air cooling of the power station according to the flow shown in the figure 1 comprises the following steps:
preparing a 4343 alloy skin material through the working procedures of conventional smelting, casting and rolling and the like;
preparing core material components according to the mass percentage of 0.35 percent of silicon, 0.55 percent of iron, 0.7 percent of copper, 1.0 percent of manganese, 0.3 percent of magnesium, 0.1 percent of zinc and the balance of aluminum;
the components are cast and rolled to obtain a core material cast and rolled coil with the thickness of 7.5 mm;
the core material cast-rolled coil is processed according to the machining rate of 50% to obtain a core material semi-finished product with the thickness of 4.0 mm;
carrying out heat treatment on the core material semi-finished product to obtain a core material, which specifically comprises the following steps: firstly heating to 610 ℃ according to the heating rate of 85 ℃/h, preserving heat for 12h, then cooling to 400 ℃ according to the cooling rate of 30 ℃/h, preserving heat for 5h, and then discharging from the furnace and air cooling;
laying 4343 alloy skin materials with the thickness of 0.85mm on the upper surface and the lower surface of the core material, and performing cold rolling compounding according to the coating rate of 14.9% to obtain a composite plate with the thickness of 2.8 mm;
and (3) roughly rolling, finishing and finish rolling the composite plate until the thickness is 0.3mm, transferring the composite plate into an annealing furnace to anneal a finished product, thus obtaining the composite finned aluminum strip for air cooling of the power station, and subsequently slitting and packaging the composite finned aluminum strip according to requirements.
Taking the prepared composite finned aluminum strip finished product for power station air cooling to detect the mechanical property; and then placing the finished product of the composite finned aluminum strip for air cooling in the power station into a muffle furnace for simulated brazing (process: 600 ℃/10min), preparing a sample according to the sample preparation requirement, and detecting the mechanical property, wherein the result is shown in the following table 3.
Table 3 composite finned aluminum strip finished product in example 3 and its mechanical properties after simulated welding
As can be seen from table 3, the tensile strength of the composite finned aluminum strip for power station air cooling prepared in example 3 was 199MPa, and the tensile strength after pseudo welding was 158MPa, indicating that the support strength after high-temperature brazing was good.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (7)
1. The composite finned aluminum strip for air cooling in a power station is characterized by comprising a core material and skin materials compounded on the upper surface and the lower surface of the core material, wherein the skin materials are 4343 alloy, and the core material comprises the following components in percentage by mass: 0.2-0.35% of silicon, 0.3-0.55% of iron, 0.5-0.7% of copper, 0.65-1.0% of manganese, 0.1-0.3% of magnesium, 0.05-0.1% of zinc and the balance of aluminum.
2. A preparation method of a composite finned aluminum strip for air cooling of a power station is characterized by comprising the following steps:
preparing core material components according to mass percentage;
the components are cast and rolled to obtain a core material cast and rolled coil with the thickness of 6.5-7.5 mm;
processing the core material cast-rolled coil to obtain a core material semi-finished product with the thickness of 4.0 mm;
carrying out heat treatment on the core material semi-finished product to obtain a core material;
laying 4343 alloy skin materials on the upper and lower surfaces of the core material, and performing cold rolling and compounding to obtain a composite plate with the thickness of 2.2-2.8 mm;
and rolling the composite plate to the thickness of 0.2-0.3mm, and transferring the composite plate into an annealing furnace to perform finished product annealing to obtain the composite finned aluminum strip for air cooling of the power station.
3. The method for manufacturing the composite finned aluminum strip for air cooling in power stations as claimed in claim 2, wherein the core material cast-rolled coil is processed at a processing rate of 38-50% to obtain a core material semi-finished product.
4. The method for preparing the composite finned aluminum strip for air cooling in power stations according to claim 2, wherein the method for heat-treating the core semi-finished product comprises the following steps: raising the temperature to 610 ℃ at the temperature raising rate of 60-85 ℃/h, preserving the heat for 12-16h, then lowering the temperature to 400 ℃ at the temperature lowering rate of 360 ℃ at the temperature lowering rate of 30 ℃/h, preserving the heat for 5h, and then discharging from the furnace for air cooling.
5. The method for preparing the composite finned aluminum strip for air cooling in power stations as claimed in claim 2, wherein the thickness of the laid 4343 alloy skin material is 0.5-0.85 mm.
6. The method for manufacturing the composite finned aluminum strip for air cooling in power stations as claimed in claim 2, wherein the core material and the 4343 alloy skin material are cold-rolled and compounded at a cladding rate of 10-15%.
7. The method of claim 2, wherein the rolling of the composite sheet material comprises rough rolling, finishing, and finish rolling.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114290006A (en) * | 2021-12-09 | 2022-04-08 | 银邦金属复合材料股份有限公司 | Anti-collapse aluminum alloy composite fin material for electric vehicle heat management and preparation method thereof |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020056492A1 (en) * | 2000-11-16 | 2002-05-16 | Jean-Claude Kucza | Aluminum alloy strip manufacturing process for the manufacture of brazed heat exchangers |
| US20030121572A1 (en) * | 2000-11-16 | 2003-07-03 | Jean-Claude Kucza | Aluminum alloy strip manufacturing process for the manufacture of brazed heat exchangers |
| CN1973056A (en) * | 2004-05-26 | 2007-05-30 | 克里斯铝轧制品有限公司 | Process for producing an aluminium alloy brazing sheet, aluminium alloy brazing sheet |
| CN101774126A (en) * | 2009-12-29 | 2010-07-14 | 江苏常铝铝业股份有限公司 | Manufacturing method of aluminium alloy compound plate and strip for power station air cooling island and product thereof |
| CN103212574A (en) * | 2013-04-15 | 2013-07-24 | 东北大学 | Method for preparing aluminium alloy compound foil by compounding cold rolling and warm rolling |
| CN107107273A (en) * | 2014-09-25 | 2017-08-29 | 爱励轧制产品德国有限责任公司 | Multilayer aluminium brazing sheet material material |
| CN108136545A (en) * | 2015-10-05 | 2018-06-08 | 海德鲁铝业钢材有限公司 | Aluminium composite material and its production method in the thermal bonding method of fluxless |
| CN108431260A (en) * | 2015-12-28 | 2018-08-21 | 株式会社Uacj | The manufacturing method of aluminum alloy brazing sheet and aluminum alloy heat exchanger |
| CN109972000A (en) * | 2019-03-18 | 2019-07-05 | 江苏鼎胜新能源材料股份有限公司 | A kind of heat exchanger composite strip and preparation method thereof |
| CN110257673A (en) * | 2019-06-24 | 2019-09-20 | 江苏鼎胜新能源材料股份有限公司 | One kind is for producing car radiation composite fin aluminum foil material and preparation method thereof |
-
2020
- 2020-04-17 CN CN202010304663.8A patent/CN111394625A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020056492A1 (en) * | 2000-11-16 | 2002-05-16 | Jean-Claude Kucza | Aluminum alloy strip manufacturing process for the manufacture of brazed heat exchangers |
| US20030121572A1 (en) * | 2000-11-16 | 2003-07-03 | Jean-Claude Kucza | Aluminum alloy strip manufacturing process for the manufacture of brazed heat exchangers |
| CN1973056A (en) * | 2004-05-26 | 2007-05-30 | 克里斯铝轧制品有限公司 | Process for producing an aluminium alloy brazing sheet, aluminium alloy brazing sheet |
| CN101774126A (en) * | 2009-12-29 | 2010-07-14 | 江苏常铝铝业股份有限公司 | Manufacturing method of aluminium alloy compound plate and strip for power station air cooling island and product thereof |
| CN103212574A (en) * | 2013-04-15 | 2013-07-24 | 东北大学 | Method for preparing aluminium alloy compound foil by compounding cold rolling and warm rolling |
| CN107107273A (en) * | 2014-09-25 | 2017-08-29 | 爱励轧制产品德国有限责任公司 | Multilayer aluminium brazing sheet material material |
| CN108136545A (en) * | 2015-10-05 | 2018-06-08 | 海德鲁铝业钢材有限公司 | Aluminium composite material and its production method in the thermal bonding method of fluxless |
| CN108431260A (en) * | 2015-12-28 | 2018-08-21 | 株式会社Uacj | The manufacturing method of aluminum alloy brazing sheet and aluminum alloy heat exchanger |
| CN109972000A (en) * | 2019-03-18 | 2019-07-05 | 江苏鼎胜新能源材料股份有限公司 | A kind of heat exchanger composite strip and preparation method thereof |
| CN110257673A (en) * | 2019-06-24 | 2019-09-20 | 江苏鼎胜新能源材料股份有限公司 | One kind is for producing car radiation composite fin aluminum foil material and preparation method thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114290006A (en) * | 2021-12-09 | 2022-04-08 | 银邦金属复合材料股份有限公司 | Anti-collapse aluminum alloy composite fin material for electric vehicle heat management and preparation method thereof |
| CN114290006B (en) * | 2021-12-09 | 2023-09-26 | 银邦金属复合材料股份有限公司 | Anti-collapse aluminum alloy composite fin material for electric automobile thermal management and preparation method thereof |
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