CN110257673B - Aluminum foil material for producing automobile heat dissipation composite fin and preparation method thereof - Google Patents
Aluminum foil material for producing automobile heat dissipation composite fin and preparation method thereof Download PDFInfo
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- CN110257673B CN110257673B CN201910547308.0A CN201910547308A CN110257673B CN 110257673 B CN110257673 B CN 110257673B CN 201910547308 A CN201910547308 A CN 201910547308A CN 110257673 B CN110257673 B CN 110257673B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/40—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling foils which present special problems, e.g. because of thinness
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K1/00—Soldering, e.g. brazing, or unsoldering
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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
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- C22C21/00—Alloys based on aluminium
- C22C21/02—Alloys based on aluminium with silicon as the next major constituent
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C21/00—Alloys based on aluminium
- C22C21/10—Alloys based on aluminium with zinc as the next major constituent
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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
- C22F1/043—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 silicon as the next major constituent
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- 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
- C22F1/053—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 zinc as the next major constituent
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Abstract
The invention relates to an aluminum foil for producing automobile heat dissipation composite fins and a preparation method thereof, wherein the material comprises a core material and an upper layer of leather material and a lower layer of leather material, the aluminum foil for the composite fins is a part of an automobile heat exchanger, the melting point of the leather material of the aluminum foil for the composite fins is lower, the aluminum foil is brazed at a certain high temperature by utilizing the characteristic that the melting point of the leather material of the aluminum foil is lower, and the leather material of the fins is melted to achieve the melting point so as to realize the combination of the fin core material and other components of the heat. The skin materials are compounded on the upper surface and the lower surface of the core material, the core material and the skin materials are continuously cast and rolled to obtain cast and rolled blanks, and the compounding is realized after the cold rolling and compounding. The preparation method has the advantages of high production efficiency, high flexibility, high quality, more stable coating rate of the aluminum foil material, high strength of the aluminum foil after high-temperature brazing, excellent corrosion resistance and excellent sagging resistance; in conclusion, the aluminum foil for the automobile heat dissipation composite fin prepared by the invention has excellent performance.
Description
Technical Field
The invention relates to the technical field of metal materials and metal material processing and forming, in particular to an aluminum alloy aluminum foil for an automobile heat dissipation composite fin and a preparation method thereof.
Background
The non-composite fin is used for laying soldering lugs in the assembling process of the heat exchanger, and the composite fin realizes the combination of the brazing layer and the fin core body, so that the step of backing up the soldering lugs can be omitted in the assembling process of the heat exchanger, the manual assembling is separated, the mechanical production is realized, the assembling efficiency is improved, and the production cost is reduced.
In the past, most of aluminum foil blanks of cooling fins for automobile heat exchanger-fin structures are produced by hot-rolled composite blanks, the production process is shown as figure 2, and the production process of the hot-rolled composite cooling composite fins is relatively complex as can be seen from figure 2.
Disclosure of Invention
The invention aims to shorten the production period, improve the production efficiency and reduce the production cost, and designs the aluminum foil material for producing the automobile heat dissipation composite fin and the preparation method thereof.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows: the utility model provides a be used for producing aluminium foil material for automobile cooling fin which characterized in that: the aluminum foil material for producing the automobile heat dissipation composite fin comprises a core material and two layers of leather materials, wherein the two layers of leather materials are respectively compounded on the upper surface and the lower surface of the core material.
The core material comprises the following chemical components: 0.6-1.0 wt% of silicon, 0-0.7 wt% of iron, 0-0.2 wt% of copper, 1.0-1.8 wt% of manganese, 0-0.1 wt% of magnesium, 1.0-2.0 wt% of zinc, 0-0.2 wt% of zirconium, 0-0.05 wt% of single non-removable impurities, 0-0.15 wt% of total content of all non-removable impurities, and the balance of aluminum;
the leather material comprises the following chemical components: 6.8-8.2 wt% of silicon, 0-0.8 wt% of iron, 0-0.25 wt% of copper, 0-0.1 wt% of manganese, 0-0.2 wt% of zinc, 0-0.05 wt% of single non-removable impurities, 0-0.15 wt% of total content of all non-removable impurities, and the balance of aluminum; the core material and the skin material alloy are respectively manufactured into a core material blank and a skin material blank through continuous casting and rolling, and are compounded into a skin material-core material-skin material structure through a cold rolling method, wherein the skin material-core material-skin material structure is the aluminum foil material for the automobile heat dissipation composite fin.
The invention also discloses a preparation method of the aluminum foil material for the automobile heat dissipation composite fin, which comprises the following steps:
(1) aluminum alloy smelting: smelting an aluminum alloy raw material according to the chemical components of the core material and the skin material to obtain a smelted skin material aluminum alloy and a core material aluminum alloy;
(2) continuous casting and rolling;
(3) preparing a core material: the core material cast-rolled plate prepared by the continuous casting and rolling method in the step (2) is cold-rolled to obtain a plate with the thickness of 3.6-5.0mm, the outer ring is welded, the steel strip is tightened on the plate surface, and annealing is carried out in an annealing furnace, wherein the specific annealing conditions are as follows: heating to the target heating temperature of 550-; then discharging from the furnace and air cooling to obtain a core material blank;
(4) preparing a leather material: the leather material cast-rolling plate prepared by the continuous cast-rolling method in the step (2) is used for carrying out blank heat treatment, and the blank heat treatment comprises the following specific steps: annealing in an annealing furnace, welding the inner ring and the outer ring, tightening the steel strip on the plate surface, heating to the target heating temperature of 500-540 ℃ within 2-4h, preserving heat for 10-18h, then transferring to the temperature of 480-520 ℃ and preserving heat for 2-6h, and then discharging from the furnace for air cooling; performing the blank heat treatment on the skin material cast-rolled plate prepared by the continuous casting and rolling method in the step (2), performing first cold rolling to 0.42-0.67mm, and then performing finishing trimming by a slitting machine, wherein the trimming size is + 20-70 mm of the width of the prepared core material; after finishing treatment, pulling and straightening the correction plate type, and cleaning surface residual oil; and (3) carrying out secondary heat treatment after withdrawal, straightening and cleaning, wherein the specific conditions of the secondary heat treatment are as follows: heating to the target heating temperature of 430-470 ℃ within 2-4h, and preserving heat for 6-12h, and transferring to the temperature of 360-410 ℃ and preserving heat for 2-5 h; then discharging from the furnace and air cooling to obtain a skin material blank;
(5) cold rolling and compounding: rolling the skin material blank and the core material blank obtained in the steps (3) and (4) by a cold compound rolling mill, and processing, rolling and compounding by using a proper processing rate to obtain a 1.7-2.8mm cold-rolled composite plate;
the cold rolling compounding realizes the combination of the skin material and the core material, the traditional hot rolling compounding can be realized only by surface treatment (cleaning), core skin material matching, heating and hot rolling compounding, and the cold rolling compounding of the invention integrates the surface treatment, the core skin material matching and the cold rolling compounding into a whole, thereby completing one process and greatly improving the production efficiency. The thickness control precision of the core material and the skin material in the preparation process is high, and the surface treatment of cold rolling compounding is realized in a mechanical automation mode, so that the surface treatment effect and the stability of the coating rate can be effectively ensured.
(6) And (3) diffusion annealing: tightening a steel strip on the surface of the cold-rolled composite plate obtained in the step (5), and performing diffusion annealing in an annealing furnace to obtain a cold-rolled composite plate after diffusion annealing; the specific conditions of the diffusion annealing are as follows: heating to the target heating temperature of 490-520 ℃ within 2-4h, and preserving heat for 6-12h, and transferring to the temperature of 360-430 ℃ and preserving heat for 2-5 h;
the higher driving force stored in the composite process and the high-temperature diffusion annealing can effectively promote the metal diffusion so as to improve the bonding depth and the strength of the metal.
(7) Rolling the diffusion annealed cold-rolled composite plate obtained in the step (6) into a composite plate with the thickness of 0.5-0.75 mm, and then performing finishing trimming by a slitting machine to obtain an aluminum coil after finishing trimming;
(8) and (3) cold rolling the aluminum coil subjected to finishing and trimming in the step (7) to obtain an aluminum coil with the thickness of 0.16-0.25mm, and then performing pre-finished product annealing treatment, wherein a high-temperature adhesive tape is adhered to the surface of the aluminum coil before annealing to fix the surface of the aluminum coil (the high-temperature adhesive tape on the surface of the aluminum coil does not fall off and keeps adhering to the aluminum coil during annealing), so that an outer ring of the aluminum coil is prevented from being blown away by a circulating fan during annealing, and the specific conditions of the pre-finished product annealing treatment are as follows: heating to 240-plus-one temperature at 280 ℃ for 2-5h in 1-2h, transferring to 420-plus-one temperature at 460 ℃ for 6-12h, and then transferring to 320-plus-one temperature at 360 ℃ for 2 h;
(9) performing finish rolling on the aluminum foil obtained after the pre-annealing treatment of the finished product in the step (8) until the finished product is 0.07-0.15 mm;
(10) cutting and packaging: and cutting the obtained finished product to the required width to obtain a qualified product, and then packaging and warehousing.
According to the preparation method of the composite aluminum foil for automobile heat dissipation, the core material and the skin material are both prepared by adopting a continuous casting and rolling method;
the aluminum foil material for the automobile heat dissipation composite fin is prepared by a cold rolling composite method, and the cold rolling composite pass working rate is 55 +/-5% (namely the proper working rate);
according to the preparation method of the aluminum foil material for the automobile heat dissipation composite fin, after cold rolling and compounding, diffusion annealing treatment is needed, so that deeper combination of the core material and the skin material is realized;
compared with the prior art, the invention has the advantages and beneficial effects that:
the invention adopts the continuous casting and rolling method to prepare the core material and the skin material, the thickness of the core material and the skin material casting and rolling plate is about 7.5mm, and the thickness is greatly reduced compared with the thickness of an ingot (generally 400mm), thereby shortening the production period, improving the production efficiency and reducing the production cost. The cold rolling compounding integrates the surface treatment, the core skin material pairing and the cold rolling compounding together, and can be completed in one process, thereby greatly improving the production efficiency. The thickness control precision of the core material and the skin material in the preparation process is high, and the surface treatment of cold rolling compounding is realized in a mechanical automation mode, so that the surface treatment effect and the stability of the coating rate are effectively ensured. The aluminum foil prepared by the method has higher post-welding strength and better corrosion resistance after high-temperature welding, ensures that the fin has excellent anti-sagging performance during brazing, and has the tensile strength of 180-220MPa, the yield strength of more than 160MPa and the elongation of more than 0.5 percent. The material can be used for controlled atmosphere protection brazing, the composite material has high strength after being welded and excellent collapse resistance, can meet the performance requirement of a radiator on the composite fin material, and the manufacturing method has the advantages of controllable process, good repeatability and easy mastering, and can meet the industrial development requirement.
Drawings
FIG. 1 is a view showing the structure of an anti-sagging apparatus;
FIG. 2 is a block diagram of a process flow of aluminum foil production for hot-rolled composite heat-dissipating composite fins.
Detailed Description
In order to enhance the understanding of the present invention, the present invention will be described in further detail with reference to the following examples, which are provided for the purpose of illustration only and are not intended to limit the scope of the present invention.
Example 1
1. According to the alloy proportion: 0.6 wt% of silicon, 0.2 wt% of iron, 0.05 wt% of copper, 1.0wt% of manganese, 0.05 wt% of magnesium, 1.1 wt% of zinc, 0.1 wt% of zirconium and 0-0.05 wt% of titanium, and preparing a core material cast-rolled plate by a continuous cast-rolling method after smelting; according to the alloy proportion: 6.8 wt% of silicon, 0.2 wt% of iron, 0.05 wt% of copper, 0.05 wt% of manganese, 0.02 wt% of zinc and the balance of aluminum, and preparing a skin material cast-rolled plate by a continuous cast-rolling method after smelting;
2. preparing a core material: cold rolling the core material cast-rolled plate to 4.0mm, welding an outer ring, tightening a steel strip on the plate surface, annealing in a high-temperature annealing furnace, heating to a target heating temperature of 550 ℃ within 3h, keeping the temperature for 26h, rotating to the temperature of 530 ℃ and keeping the temperature for 5h, and then discharging from the furnace and air cooling to obtain a core material blank;
3. preparing a leather material: the method comprises the following steps of performing blank heat treatment on a skin material cast-rolled coil: welding an inner ring and an outer ring, tightening a steel belt on the surface of the steel belt, annealing the steel belt in a high-temperature annealing furnace, heating the steel belt to a target heating temperature of 530 ℃ within 3 hours, keeping the temperature for 15 hours at the target heating temperature, keeping the temperature for 3 hours at the target heating temperature of 500 ℃, and then discharging the steel belt out of the furnace for air cooling; the skin material cast-rolled coil is subjected to blank heat treatment, then is subjected to cold rolling to 0.5mm, and then is subjected to finishing and trimming by a slitting machine, wherein the trimming size is the width of the prepared core material plus 30 mm; after finishing treatment, pulling and straightening the correction plate type, and cleaning surface residual oil; performing secondary heat treatment after straightening and cleaning, heating to the target heating temperature of 460 ℃ within 2h, preserving heat for 9h, rotating to the temperature of 400 ℃ and preserving heat for 3h, and then discharging from a furnace and air cooling to obtain a skin material blank;
4. cold rolling and compounding: rolling and compounding the skin material blank and the core material blank by a cold compounding rolling mill to obtain a 2.1mm cold-rolled composite plate;
5. and (3) diffusion annealing: tightening a steel strip on the surface of the cold-rolled composite plate, performing diffusion annealing in an annealing furnace, heating to a target heating temperature of 520 ℃ within 3h, keeping the temperature for 8h, and keeping the temperature for 2h at a temperature of 430 ℃;
6. after the composite board is diffused, rolling the composite board by a roughing mill for 0.6mm, and then performing finishing and trimming by a slitting machine; then cold rolling to
0.18mm, sticking a high-temperature adhesive tape on the surface of the aluminum coil to fix the surface, and then placing the aluminum coil in an annealing furnace for annealing treatment before forming a finished product, wherein the specific process comprises the following steps: heating to 250 ℃ for 1h, preserving heat for 5h, transferring to 460 ℃ for 8h, and then transferring to 330 ℃ for 2 h; annealing treatment before the finished product, finish rolling to 0.08mm, and cutting to the required width by thin shear.
Taking a finished product sample, and detecting the mechanical properties of the finished product sample as shown in the following table 1:
TABLE 1 mechanical Properties of the finished product obtained in example 1
The coating rates of the resulting products are shown in table 2 below:
table 2 coating rate of the product obtained in example 1
| Position of the sample | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
| Measured as the coating rate% | 10.1 | 9.8 | 10 | 9.5 | 10.2 | 10.3 | 10.5 | 9.9 |
Remarking: the target cladding rate is 10 +/-2%, the positions of the sampled sheets are equal-spacing sampling of the transverse plate surface of the product, and the data show that the deviation of the cladding rate of cold rolling compounding is 1.0 and is relatively stable.
Taking a finished product sample, firstly carrying out a simulated brazing test (process: 600 ℃/10min), then carrying out a tensile test according to the sample preparation requirement, and detecting the post-welding mechanical property of the finished material, wherein the detection results are as follows in table 3:
table 3 post weld mechanical properties simulated for the finished product made in example 1
The tensile strength of the fin after simulated brazing is larger than 130Mpa, and the support strength of the fin after high-temperature brazing is good.
And (4) taking a finished product sample, preparing the sample according to the sample preparation requirement, then carrying out a sag resistance value test, and finally carrying out data comparison to detect the sag resistance of the finished material product.
a. A sample preparation mode comprises:
in the plane of the sample Rolling Direction (RD) and the Transverse Direction (TD), the length is 100mm along the rolling direction, the length is 22mm along the transverse direction, namely the specification of the experimental sample is 100mmx22mmx0.08mm, the experimental device is shown in the attached drawing 1, the length of a cross beam is 250mm, the width is 50mm, the height is 105mm, and the height of the position for clamping and placing the sample is 80.71 mm. The sample number is 01-05 #.
b. The test process comprises the following steps:
the apparatus (see figure 1) was placed in a muffle furnace and the temperature was raised according to the following ramp-up schedule: room temperature 20 ℃ → 400 ℃/30min +400 ℃ holding 5min +400 → 600 ℃/22min +600 ℃ holding 10min, after the final heat treatment at 600 ℃, the coupons are immediately taken out.
c. The test results are shown in Table 4:
TABLE 4 sag resistance of the finished product made in example 1
Example 2
1. According to the alloy proportion: 0.95 wt% of silicon, 0.68 wt% of iron, 0.15 wt% of copper, 1.7 wt% of manganese, 0.08 wt% of magnesium, 1.8 wt% of zinc, 0.18 wt% of zirconium and the balance of aluminum, and preparing a core material cast-rolled plate by a continuous cast-rolling method after smelting; according to the alloy proportion: 8.1 wt% of silicon, 0.8 wt% of iron, 0.2 wt% of copper, 0.1 wt% of manganese, 0.2 wt% of zinc and the balance of aluminum, and preparing a skin material cast-rolled plate by a continuous cast-rolling method after smelting;
2. preparing a core material: cold rolling a core material cast-rolled plate to 5.0mm, welding an outer ring, tightening a steel strip on the surface of the plate, annealing the plate in a high-temperature annealing furnace, heating the plate to a target heating temperature of 580 ℃ within 3 hours, keeping the temperature for 22 hours at the target heating temperature of 550 ℃, keeping the temperature for 3 hours at the target heating temperature, and then discharging the plate from the furnace and air cooling to obtain a core material blank;
3. preparing a leather material: the method comprises the following steps of performing blank heat treatment on a skin material cast-rolled coil: welding the inner ring and the outer ring of the cast-rolling coil, tightening a steel belt on the surface of the steel belt, annealing the steel belt in a high-temperature annealing furnace, heating the steel belt to a target heating temperature of 500 ℃ within 3 hours, preserving the heat for 18 hours, rotating the steel belt to a temperature of 480 ℃ and preserving the heat for 6 hours, and then discharging the steel belt out of the furnace for air cooling; the skin material cast-rolled coil is subjected to blank heat treatment, then is subjected to cold rolling until the skin material is 0.62mm, and then is subjected to finishing trimming by a slitting machine, wherein the trimming size is that the width of the prepared core material is plus 70 mm; after finishing treatment, pulling and straightening the correction plate type, and cleaning surface residual oil; performing secondary heat treatment after straightening and cleaning, heating to the target heating temperature of 430 ℃ within 2 hours, preserving heat for 12 hours, rotating to the temperature of 360 ℃, preserving heat for 5 hours, and then discharging from a furnace and air cooling to obtain a skin material blank;
4. cold rolling and compounding: rolling and compounding the skin material blank and the core material blank by a cold compounding rolling mill to obtain a 2.5mm cold-rolled composite plate;
5. and (3) diffusion annealing: tightening a steel strip on the surface of the cold-rolled composite plate, performing diffusion annealing in an annealing furnace, heating to a target heating temperature of 500 ℃ within 3h, keeping the temperature for 10h, and keeping the temperature for 5h at a transition temperature of 400 ℃;
6. after diffusion annealing, the composite plate is rolled by a roughing mill for 0.65mm, and then a slitting machine is used for finishing and trimming; then rolling to 0.22mm, sticking a high-temperature adhesive tape on the surface of the aluminum coil to fix the surface, and then carrying out pre-finished product heat treatment, wherein the specific annealing process is as follows: heating to 260 ℃ for 1h, preserving heat for 5h, turning to 430 ℃ for 11h, and then turning to 360 ℃ for 2 h; after heat treatment, the steel is finely rolled to 0.13mm and then is cut into required width by thin scissors.
Taking a finished product sample, and detecting the mechanical properties as the following table 5:
TABLE 5 mechanical Properties of the final product from example 2
The coating rates of the resulting products are given in table 6 below:
table 6 coating percentage of the product obtained in example 2
| Position of the sample | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
| Measured as the coating rate% | 9.9 | 10.1 | 9.6 | 10.6 | 10.8 | 9.7 | 10.5 | 9.3 |
Remarking: the target cladding rate is 10 +/-2%, the positions of the sampled sheets are equal-interval sampling of the transverse plate surface of the product, and the data show that the cladding rate deviation of cold rolling compounding is 1.3, relatively stable and obviously superior to that of hot rolling compounding.
Taking a finished product sample, firstly carrying out a simulated brazing test (process: 600 ℃/10min), then carrying out a tensile test according to the sample preparation requirement, and detecting the post-welding mechanical property of the finished material, wherein the detection results are as follows:
TABLE 7 post-weld mechanical Properties of the finished product made in example 2
The tensile strength of the fin after simulated brazing is larger than 130Mpa, and the support strength of the fin after high-temperature brazing is good.
And (4) taking a finished product sample, preparing the sample according to the sample preparation requirement, then carrying out a sag resistance value test, and finally carrying out data comparison to detect the sag resistance of the finished material product.
a. A sample preparation mode comprises:
in the plane of the sample Rolling Direction (RD) and the Transverse Direction (TD), the length is 100mm along the rolling direction, the length is 22mm along the transverse direction, namely the specification of the experimental sample is 100mmx22mmx0.08mm, the experimental device is shown in the attached drawing 1, the length of a cross beam is 250mm, the width is 50mm, the height is 105mm, and the height of the position for clamping and placing the sample is 80.71 mm. The sample number is 01-05 #.
b. The test process comprises the following steps:
the apparatus (see figure 1) was placed in a muffle furnace and the temperature was raised according to the following ramp-up schedule: room temperature 20 ℃ → 400 ℃/30min +400 ℃ holding 5min +400 → 600 ℃/22min +600 ℃ holding 10min, after the final heat treatment at 600 ℃, the coupons are immediately taken out.
c. The test results are shown in Table 8:
TABLE 8 sag resistance of the finished product made in example 2
| Experiment number | Height/mm of sample wafer before simulated brazing | Height/mm of sample wafer after simulation of brazing | Sag value/mm |
| 1# | 97.08 | 84.06 | 13.02 |
| 2# | 96.73 | 83.52 | 13.21 |
| 3# | 96.68 | 84.36 | 12.32 |
| 4# | 97.74 | 83.69 | 13.05 |
| 5# | 96.58 | 83.5 | 13.08 |
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (2)
1. A preparation method of an aluminum foil material for an automobile heat dissipation composite fin is characterized in that,
the aluminum foil material for the automobile heat dissipation composite fin comprises a core material and two layers of leather materials, wherein the two layers of leather materials are respectively compounded on the upper surface and the lower surface of the core material;
the core material comprises the following chemical components: 0.6-1.0 wt% of silicon, 0-0.7 wt% of iron, 0-0.2 wt% of copper, 1.0-1.8 wt% of manganese, 0-0.1 wt% of magnesium, 1.0-2.0 wt% of zinc, 0-0.2 wt% of zirconium, 0-0.05 wt% of single non-removable impurities, 0-0.15 wt% of total content of all non-removable impurities, and the balance of aluminum;
the leather material comprises the following chemical components: 6.8-8.2 wt% of silicon, 0-0.8 wt% of iron, 0-0.25 wt% of copper, 0-0.1 wt% of manganese, 0-0.2 wt% of zinc, 0-0.05 wt% of single non-removable impurities, 0-0.15 wt% of total content of all non-removable impurities, and the balance of aluminum;
the aluminum foil material for the automobile heat dissipation composite fin is of a skin material-core material-skin material structure;
the method comprises the following steps:
(1) aluminum alloy smelting: respectively smelting the skin material and the core material according to the chemical components to obtain a smelted skin material aluminum alloy and a smelted core material aluminum alloy;
(2) continuous casting and rolling: respectively and continuously casting and rolling the smelted skin aluminum alloy and core aluminum alloy into a skin cast-rolled plate and a core cast-rolled plate;
(3) preparing a core material: the core material cast-rolled plate prepared by the continuous casting and rolling method in the step (2) is cold-rolled to obtain a plate with the thickness of 3.6-5.0mm, the outer ring is welded, the steel strip is tightened on the plate surface, and annealing is carried out in an annealing furnace, wherein the specific annealing conditions are as follows: heating to the target heating temperature of 550-; then discharging from the furnace and air cooling to obtain a core material blank;
(4) preparing a leather material: the leather material cast-rolling plate prepared by the continuous cast-rolling method in the step (2) is used for carrying out blank heat treatment, and the blank heat treatment comprises the following specific steps: annealing in an annealing furnace, welding the inner ring and the outer ring, tightening the steel strip on the plate surface, heating to the target heating temperature of 500-540 ℃ within 2-4h, preserving heat for 10-18h, then transferring to the temperature of 480-520 ℃ and preserving heat for 2-6h, and then discharging from the furnace for air cooling; performing the blank heat treatment on the skin material cast-rolled plate prepared by the continuous casting and rolling method in the step (2), performing first cold rolling to 0.42-0.67mm, and then performing finishing trimming by a slitting machine, wherein the trimming size is + 20-70 mm of the width of the prepared core material; after finishing treatment, pulling and straightening the correction plate type, and cleaning surface residual oil; and (3) carrying out secondary heat treatment after withdrawal, straightening and cleaning, wherein the specific conditions of the secondary heat treatment are as follows: heating to the target heating temperature of 430-470 ℃ within 2-4h, and preserving heat for 6-12h, and transferring to the temperature of 360-410 ℃ and preserving heat for 2-5 h; then discharging from the furnace and air cooling to obtain a skin material blank;
(5) cold rolling and compounding: rolling the core material blank and the skin material blank obtained in the steps (3) and (4) by a cold compound rolling mill, and processing, rolling and compounding by adopting a proper processing rate to obtain a 1.7-2.8mm cold-rolled composite plate;
(6) and (3) diffusion annealing: tightening a steel strip on the surface of the cold-rolled composite plate obtained in the step (5), performing diffusion annealing in an annealing furnace, heating to the target heating temperature of 490-520 ℃ within 2-4h, preserving heat for 6-12h, and transferring to the temperature of 360-430 ℃ for preserving heat for 2-5h to obtain the cold-rolled composite plate after diffusion annealing;
(7) cold rolling the diffusion annealed cold-rolled composite plate obtained in the step (6) into a composite plate with the thickness of 0.5-0.75 mm, and then performing finishing trimming by a slitting machine to obtain an aluminum coil after finishing trimming;
(8) and (3) cold rolling the finished and trimmed aluminum coil obtained in the step (7) to obtain an aluminum coil with the thickness of 0.16-0.25mm, and then performing pre-finished product annealing treatment, wherein a high-temperature adhesive tape is attached to the surface of the aluminum coil during annealing so as to fix the surface of the aluminum coil, and the pre-finished product annealing treatment specifically comprises the following steps: heating to 240-plus-one temperature at 280 ℃ for 2-5h in 1-2h, transferring to 430-plus-one temperature at 460 ℃ for 6-12h, and then transferring to 320-plus-one temperature at 360 ℃ for 2 h;
(9) performing finish rolling on the aluminum foil obtained after the pre-annealing treatment of the finished product in the step (8), and rolling the finished product to ensure that the thickness of the finished product aluminum foil is 0.07-0.15 mm;
(10) and (6) cutting and packaging.
2. The preparation method according to claim 1, wherein the specific process of the step (10) is as follows: and cutting the obtained finished aluminum foil to the required width to obtain a qualified product, and then packaging and warehousing.
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