CN111906143A - Brazing aluminum alloy composite material and preparation method thereof - Google Patents
Brazing aluminum alloy composite material and preparation method thereof Download PDFInfo
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- CN111906143A CN111906143A CN202010575123.3A CN202010575123A CN111906143A CN 111906143 A CN111906143 A CN 111906143A CN 202010575123 A CN202010575123 A CN 202010575123A CN 111906143 A CN111906143 A CN 111906143A
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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
- B21B1/38—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 sheets of limited length, e.g. folded sheets, superimposed sheets, pack rolling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B47/00—Auxiliary arrangements, devices or methods in connection with rolling of multi-layer sheets of metal
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
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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
- B21B1/38—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 sheets of limited length, e.g. folded sheets, superimposed sheets, pack rolling
- B21B2001/386—Plates
Abstract
The invention discloses a brazing aluminum alloy composite material and a preparation method thereof, wherein the brazing aluminum alloy composite material comprises the following steps: primary compounding: compounding the skin material 1 and the core material 1 to obtain a first composite material; primary hot rolling: preheating the first composite material, and carrying out hot rolling on the preheated first composite material to obtain a skin material 2; secondary compounding: compounding the skin material 2 and the core material 2 to obtain a second composite material; secondary hot rolling: preheating the second composite material, and carrying out hot rolling on the preheated second composite material to obtain a hot rolled coil; cold rolling: performing multi-pass cold rolling on the hot rolled coil to obtain a cold rolled coil; intermediate annealing: and (4) carrying out recrystallization annealing on the cold-rolled coil to obtain the O-state brazing aluminum alloy composite material. The compounding ratio of the aluminum alloy material for brazing is 0.25-4%, the use of a skin material with the thickness of less than 10mm is avoided, and the risk of skin bubble formation of hot rolled coils and the risk of skin folding during hot rolling of the hot rolled coils are reduced.
Description
Technical Field
The invention relates to the field of materials, in particular to a brazing aluminum alloy composite material and a preparation method thereof.
Background
At present, brazing aluminum alloy composite plates, strips and foils (hereinafter referred to as composite materials) are widely applied to the fields of automobile radiators, evaporators, condensers, oil coolers, rail transit, air separation equipment and the like. 4xxx/3xxx is the brazing aluminum alloy composite material which is most widely applied in the field of the heat exchanger at present, and the good welding performance of the brazing aluminum alloy composite material can meet the requirements of manufacturing heat exchangers with various complex structures. The 3xxx Al-Mn alloy used as the core material provides necessary strength and corrosion resistance for each heat exchanger component, and the 4xxx Al-Si alloy with low melting point (the liquidus is about 50 ℃ lower than that of the core material) is melted before the 3xxx system during brazing, and then is solidified to form a welding joint during cooling so as to connect each component (a fin, a flat pipe, a box body and the like) of the heat exchanger. Along with the gradual application of the brazing aluminum alloy to the air separation equipment, new requirements are provided for the structural design of the brazing aluminum alloy; the application of (5-10 mm) thick plate brazing aluminum alloy is developed in the development direction, and the selection of 4xxx series alloy and the absolute thickness of a brazing layer are mainly used for influencing the brazing effect from the design consideration of the brazing aluminum alloy composite material, and if the absolute thickness of the brazing layer is ensured to be unchanged, the compounding rate of the required skin material must be reduced along with the increase of the thickness of the plate; the lower the compounding rate is, the thinner the thickness of the leather material required in compounding is, and the thinner the leather material is (below 10mm) is, the more difficult the shape of the leather material is to be ensured; the thinner the skin material is, the more difficult the skin material is to be compounded in hot rolling, and the bubble peeling is easily generated.
The compounding rate of the existing brazing aluminum alloy material produced by using a mature hot rolling compounding process is generally 5 to 20 percent. When the compounding ratio of the aluminum alloy material for brazing is less than 5 percent and the thickness of the skin material is less than 10mm, the aluminum alloy material is difficult to prepare. At present, the following two schemes are adopted for preparing the leather material with the thickness of less than 10mm, but the two schemes have the defects which cannot be overcome. The first scheme is as follows: the plate shape can not be ensured because the thickness of the skin material is too thin and the final rolling temperature is low; scheme II: the hot rolling is coiled, the outer cooperation is sent to open the screen machine and cut the board, because need the outer cooperation cut the board, processing cost can increase to skin sheet material less than 10mm, because the size is great, generally 10mm 1250mm 6870mm, skin material transports the upset difficulty during the complex, makes skin sheet material changeablely, and then leads to producing the skinning bubble during hot rolling, and when skin sheet material and core material complex below 10mm of thickness hot rolling, if control is improper, skin material is easy to be buckled.
Disclosure of Invention
The invention discloses a brazing aluminum alloy composite material and a preparation method thereof, aiming at the problems in the existing production process of aluminum alloy for brazing, the method can stably produce the brazing aluminum alloy composite material with the composite rate of 0.25-4% in batch, and the tolerance of the composite rate can be controlled within +/-0.3%.
The invention provides a preparation method of a brazing aluminum alloy composite material, which comprises the following steps: primary compounding: compounding the skin material 1 and the core material 1 to obtain a first composite material; primary hot rolling: preheating the first composite material, and carrying out hot rolling on the preheated first composite material to obtain a skin material 2; secondary compounding: compounding the skin material 2 and the core material 2 to obtain a second composite material; secondary hot rolling: preheating the second composite material, and carrying out hot rolling on the preheated second composite material to obtain a hot rolled coil; cold rolling: performing multi-pass cold rolling on the hot rolled coil to obtain a cold rolled coil; intermediate annealing: carrying out recrystallization annealing on the cold-rolled coil to obtain an O-state brazing aluminum alloy composite material; wherein, the compounding rate of the leather material 1 is 5-20% during one-time compounding; and when the leather materials are compounded for the second time, the compounding rate of the leather materials 2 is 5-20%.
Preferably, in the primary hot rolling, the preheating temperature of the first composite material is 450-550 ℃, and the heat preservation time is 2-10 h; the thickness of the first composite material after hot rolling is 20-100 mm.
Preferably, in the secondary hot rolling, the preheating temperature is 450-550 ℃, and the heat preservation time is 2-10 h; the thickness of the second composite material after hot rolling is 5-15 mm.
Preferably, in the intermediate annealing, the annealing temperature of recrystallization annealing is 300-500 ℃, and the heat preservation time is 2-10 h.
Preferably, the thickness of the O-state brazing aluminum alloy composite material is 2.0-10.0 mm.
Preferably, the method further comprises the following steps: and finally cold rolling the O-state brazing aluminum alloy composite material to obtain the H14-state brazing aluminum alloy composite material.
Preferably, in the finish rolling, the cold rolling reduction is 10-50%; the thickness of the H14-state brazing aluminum alloy composite material is 2.0-10.0 mm.
Preferably, the core material 1 and the core material 2 are the same alloy or different alloys.
Preferably, the core material 1 and the core material 2 are both 3003MOD aluminum alloy, and the skin material 1 is 4045 or 4004 aluminum alloy.
Preferably, before the primary compounding, the method comprises the following steps: casting: respectively casting the core material 1, the skin material 1 and the core material 2 by adopting DC (direct Current), and casting after smelting each component to respectively obtain cast ingots of the core material 1, the core material 1 and the core material 2; sawing and milling: respectively cutting off the head and the tail of the cast ingot of the core material 1, the skin material 1 and the core material 2 by using a sawing machine, and milling off a surface segregation layer and a surface quenching layer; rolling the skin material 1: preheating the skin material 1 cast ingot after sawing and milling, wherein the preheating temperature is 450-550 ℃, and the heat preservation time is 2-10 h; and (3) carrying out hot rolling on the preheated skin material 1 ingot until the thickness is 20-150 mm, thus obtaining the skin material 1.
Preferably, after the core material 2 is cast, the method further includes: homogenizing the core material 2 ingot, wherein the homogenizing temperature is 450-650 ℃, and the heat preservation time is 2-10 h.
The invention also provides a brazing aluminum alloy composite material prepared by any one of the methods described above.
The invention discloses a preparation method of a brazing aluminum alloy composite material, which can stably produce the brazing aluminum alloy composite material with the composite rate of 0.25-4% in batches, and the tolerance of the composite rate can be controlled within +/-0.3%; the use of the skin material with the thickness less than 10mm is avoided, and the risk of skin bubble formation of the hot rolled coil and the risk of skin material folding during hot rolling of the hot rolled coil are reduced.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without exceeding the protection scope of the present application.
FIG. 1 is a schematic structural diagram of a first composite material according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a second composite material according to an embodiment of the present invention;
FIG. 3 is a flow chart of one embodiment of the present invention for preparing a brazing aluminum alloy composite;
FIG. 4 is a flow chart of another embodiment of the present invention for preparing a brazing aluminum alloy composite.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
As shown in fig. 1-2, the brazing aluminum alloy composite material 200 provided by the present invention is prepared by roll-compounding a core material 1(110) and a skin material 1(120) to prepare a skin material 2(100), and then roll-compounding the skin material with the core material 2 (130). The composite rate is a thickness ratio of the composite material, for example, a composite rate of 5-20% for the skin material 1 means a ratio of 5-20% for the skin material 1, and a composite rate of 5-20% for the skin material 2 means a ratio of 5-20% for the skin material 2.
Alternatively, the core material 1 and the core material 2 may be the same alloy or different alloys.
Alternatively, the core materials 1 and 2 may both be 3003MOD aluminum alloy and the skin material is 4045 or 4004 aluminum alloy.
3003MOD aluminum alloy comprises: si: 0.08 to 0.9 wt%, Fe: 0.1 to 0.7 wt%, Cu: 0.05-1.0 wt%, Mn: 0.5 to 1.8 wt%, Zr: 0.050-0.4 wt%, and the balance of Al and inevitable impurities less than 0.15 wt%.
The 4045 aluminum alloy includes: si: 9-11 wt%, Fe: 0.8 wt%, Cu: 0.3 wt%, Mn: 0.05 wt%, the balance being Al and less than 0.15 wt% of unavoidable impurities.
The 4004 aluminum alloy includes: si: 9-10.5 wt%, Fe: 0.8 wt%, Cu: 0.25 wt%, Mn: 0.05 wt%, Mg: 1-2 wt%, Bi: 0.05 wt% and the balance Al.
FIG. 3 is a flow chart illustrating the preparation of the above brazing aluminum alloy composite material according to one embodiment of the present invention. The preparation method of the brazing aluminum alloy composite material comprises the following steps: primary compounding, primary hot rolling, secondary compounding, secondary hot rolling, cold rolling and intermediate annealing. Specifically, the method comprises the following steps:
primary compounding: as shown in fig. 1, the skin material 1(120) and the core material 1(110) are compounded at a compounding ratio of 5 to 20% to obtain a first composite material.
Primary hot rolling: preheating the first composite material, wherein the preheating temperature is 450-550 ℃, and the heat preservation time is 2-10 h; and (3) hot rolling the preheated first composite material to the thickness of 20-100 mm, and shearing to obtain the skin material 2 (100).
Secondary compounding: as shown in fig. 2, the skin material 2(100) and the core material 2(130) are combined at a combination ratio of 5 to 20% to obtain a second composite material.
Secondary hot rolling: preheating the second composite material, wherein the preheating temperature is 450-550 ℃, and the heat preservation time is 2-10 h; and hot rolling the preheated second composite material to the thickness of 5-15 mm to obtain a hot rolled coil.
Cold rolling: and carrying out multi-pass cold rolling on the hot-rolled coil to obtain a cold-rolled coil.
Intermediate annealing: and (3) carrying out recrystallization annealing on the cold-rolled coil, wherein the annealing temperature is 300-500 ℃, and the heat preservation time is 2-10 h, so as to obtain an O-state aluminum alloy coil, namely the O-state brazing aluminum alloy composite material, and the thickness is 2.0-10.0 mm.
Preferably, after the intermediate annealing, the method further comprises the following steps of: and (3) carrying out final cold rolling on the O-state aluminum alloy coil until the thickness is 2.0-10.0 mm, and the cold rolling reduction rate is 10% -50%, so as to obtain the H14-state aluminum alloy coil, namely the H14-state brazing aluminum alloy composite material, as shown in figure 4.
Preferably, before the first compounding, the method further comprises the following steps:
casting: the core material 1 and the skin material 1 are respectively cast by DC, and the core material 1 and the skin material 1 are cast after smelting the components to respectively obtain cast ingots of the core material 1 and the core material 1.
Sawing and milling: and respectively cutting off the head and the tail of the core material 1 and the core material 1 by using a sawing machine, and milling a surface segregation layer and a surface quenching layer.
Rolling the skin material 1: preheating the skin material 1 ingot after sawing and milling, wherein the preheating temperature is 450-550 ℃, and the heat preservation time is 2-10 h; and (3) carrying out hot rolling on the preheated skin material 1 ingot until the thickness is 20-150 mm to obtain the skin material 1.
Before the second compounding, the method further comprises the following steps:
casting: and (3) casting the core material 2 by adopting DC (direct current), and casting after smelting all the components to obtain the core material 2 ingot.
Sawing and milling: and (3) cutting the head and the tail of the core material 2 ingot by using a sawing machine, and milling a surface segregation layer and a surface quenching layer.
Preferably, after casting, the method further comprises: homogenizing the core material 2 ingot, wherein the homogenizing temperature is 450-650 ℃, and the heat preservation time is 2-10 h.
The preparation method can be used for preparing the aluminum alloy composite material with the cladding rate of the skin material 1 of 0.25-4%, and the error is within +/-0.3%.
Example 1
The brazing aluminum alloy composite material provided by the embodiment is an O-state aluminum alloy roll. Wherein, core 1 and core 2 are same 3003MOD, and its constitution is: si: 0.2 wt%, Fe: 0.7 wt%, Cu: 0.05 wt%, Mn: 1.8 wt%, Zr: 0.4 wt%, the balance being Al and less than 0.15 wt% of unavoidable impurities.
The leather material is 4045 and comprises the following components: si: 9 wt%, Fe: 0.3 wt%, Cu: 0.1 wt%, Mn: 0.05 wt%, the balance being Al and less than 0.15 wt% of unavoidable impurities.
The preparation process of the brazing aluminum alloy composite material comprises the following steps:
casting the skin material 1, the core material 1 and the core material 2: 3003MOD and 4045 are cast by DC, and the components are melted and cast to obtain ingot.
Casting, sawing and milling the skin material 1, the core material 1 and the core material 2: 3003MOD and 4045 adopt sawing machine to cut off head and tail, and mill off surface segregation layer and surface quenching layer.
Hot rolling of the skin material 1: preheating the 4045 skin material 1 ingot, wherein the preheating temperature is 500 ℃, and the heat preservation time is 2 h; and then, carrying out hot rolling on the preheated skin material 1 ingot until the thickness is 30mm to obtain the skin material 1.
Primary compounding: and compounding the 4045 leather material 1 and the 3003MOD core material 1 according to the compounding rate of 5% to obtain a first composite material.
Primary hot rolling: preheating the first composite material after the primary compounding, wherein the preheating temperature is 500 ℃, and the heat preservation time is 2 h; the preheated first composite material is then hot rolled to a thickness of 30mm, obtaining skin material 2.
Secondary compounding: and compounding the skin material 2 and the 3003MOD core material 2 according to the compounding rate of 5% to obtain a second composite material.
Secondary hot rolling: preheating the second composite material after the secondary compounding, wherein the preheating temperature is 500 ℃, and the heat preservation time is 2 hours; then, hot rolling the preheated second composite material to the thickness of 15mm to obtain a hot rolled coil; and (5) carrying out subsequent cold rolling.
Cold rolling: and carrying out multi-pass cold rolling on the hot rolled coil to obtain the cold rolled coil with the preset annealing thickness.
Intermediate annealing: and (3) carrying out complete recrystallization annealing on the cold-rolled coil, wherein the annealing temperature is 380 ℃, and the heat preservation time is 10 hours, so that the O-state brazing aluminum alloy composite material with the thickness of 8mm and the cladding rate of 0.25% of the cladding material 1 is obtained.
Example 2
The brazing aluminum alloy composite material provided by the embodiment is an O-state aluminum alloy roll. Wherein, core 1 and core 2 are same 3003MOD, and its constitution is: si: 0.9 wt%, Fe: 0.1 wt%, Cu: 1.0 wt%, Mn: 0.5 wt%, Zr: 0.05 wt%, the balance being Al and less than 0.15 wt% of unavoidable impurities.
The leather material is 4045 and comprises the following components: si: 11 wt%, Fe: 0.3 wt%, Cu: 0.1 wt%, Mn: 0.05 wt%, the balance being Al and less than 0.15 wt% of unavoidable impurities.
The preparation process of the brazing aluminum alloy composite material comprises the following steps:
casting the skin material 1, the core material 1 and the core material 2: 3003MOD and 4045 are cast by DC, and the components are melted and cast to obtain ingot.
Casting, sawing and milling the skin material 1, the core material 1 and the core material 2: 3003MOD and 4045 adopt sawing machine to cut off head and tail, and mill off surface segregation layer and surface quenching layer.
Hot rolling of the skin material 1: preheating the 4045 skin material 1 ingot, wherein the preheating temperature is 500 ℃, and the heat preservation time is 2 h; and then, carrying out hot rolling on the preheated skin material 1 ingot until the thickness is 134mm to obtain the skin material 1.
Primary compounding: the 4045 leather material 1 and the 3003MOD core material 1 are compounded according to the compounding rate of 20% to obtain a first composite material.
Primary hot rolling: preheating the first composite material after the primary compounding, wherein the preheating temperature is 500 ℃, and the heat preservation time is 2 h; the preheated first composite material is then hot rolled to a thickness of 134mm, obtaining skin material 2.
Secondary compounding: and compounding the skin material 2 and the 3003MOD core material 2 according to the compounding rate of 20% to obtain a second composite material.
Secondary hot rolling: preheating the second composite material after the secondary compounding, wherein the preheating temperature is 500 ℃, and the heat preservation time is 2 hours; then, hot rolling the preheated second composite material to the thickness of 5mm to obtain a hot rolled coil; and (5) carrying out subsequent cold rolling.
Cold rolling: and carrying out multi-pass cold rolling on the hot rolled coil to obtain the cold rolled coil with the preset annealing thickness.
Intermediate annealing: and (3) carrying out complete recrystallization annealing on the cold-rolled coil, wherein the annealing temperature is 380 ℃, and the heat preservation time is 2 hours, so that the O-state brazing aluminum alloy composite material with the thickness of 3mm and the cladding rate of 4% of the cladding material 1 is obtained.
Example 3
The brazing aluminum alloy composite material provided by the embodiment is H14 aluminum alloy roll. Wherein, core 1 and core 2 are same 3003MOD, and its constitution is: si: 0.2 wt%, Fe: 0.3 wt%, Cu: 0.1 wt%, Mn: 0.7 wt%, Zr: 0.3 wt%, the balance being Al and less than 0.15 wt% of unavoidable impurities.
The leather material is 4004, and comprises the following components: si: 9 wt%, Fe: 0.3 wt%, Cu: 0.1 wt%, Mn: 0.03 wt%, Mg: 2 wt%, the balance being Al and less than 0.15 wt% of unavoidable impurities.
The preparation process of the brazing aluminum alloy composite material comprises the following steps:
casting the skin material 1, the core material 1 and the core material 2: 3003MOD and 4004 are cast by DC, and the components are smelted and cast to obtain cast ingots; and homogenizing the core material 2, wherein the homogenizing temperature is 600 ℃, and the heat preservation time is 10 hours.
Casting, sawing and milling the skin material 1, the core material 1 and the core material 2: 3003MOD and 4004 adopt sawing machine to cut off head and tail, and mill off surface segregation layer and surface quenching layer.
Hot rolling of the skin material 1: preheating the 4004 skin material 1 cast ingot, wherein the preheating temperature is 500 ℃, and the heat preservation time is 2 h; and then, carrying out hot rolling on the preheated skin material 1 ingot until the thickness is 50mm to obtain the skin material 1.
Primary compounding: the 4004 leather material 1 and the 3003MOD core material 1 are compounded at a compounding ratio of 10%.
Primary hot rolling: preheating the first composite material after the primary compounding, wherein the preheating temperature is 500 ℃, and the heat preservation time is 2 h; the preheated first composite material is then hot rolled to a thickness of 50mm, obtaining skin material 2.
Secondary compounding: and compounding the skin material 2 and the 3003MOD core material 2 according to the compounding rate of 10% to obtain a second composite material.
Secondary hot rolling: preheating the second composite material after the secondary compounding, wherein the preheating temperature is 500 ℃, and the heat preservation time is 2 hours; then, hot rolling the preheated second composite material to the thickness of 8mm to obtain a hot rolled coil; and (5) carrying out subsequent cold rolling.
Cold rolling: and carrying out multi-pass cold rolling on the hot rolled coil to obtain the cold rolled coil with the preset annealing thickness.
Intermediate annealing: and (3) carrying out complete recrystallization annealing on the cold-rolled coil, wherein the annealing temperature is 400 ℃, and the heat preservation time is 2 hours, so that the O-state aluminum alloy coil with the thickness of 4mm is obtained.
And (3) finish rolling: and finally cold rolling the O-state aluminum alloy coil obtained after annealing according to the preset reduction of the finished product pass, wherein the preset reduction of the finished product pass is 50%, and the H14-state brazing aluminum alloy composite material with the thickness of 2.0mm and the cladding rate of 1% of the skin material is obtained.
Example 4
The brazing aluminum alloy composite material provided by the embodiment is H14 aluminum alloy roll. Wherein, core 1 and core 2 are same 3003MOD, and its constitution is: si: 0.8 wt%, Fe: 0.6 wt%, Cu: 0.9 wt%, Mn: 1.5 wt%, Zr: 0.15 wt%, the balance being Al and less than 0.15 wt% of unavoidable impurities.
The leather material is 4004, and comprises the following components: si: 10.5 wt%, Fe: 0.3 wt%, Cu: 0.1 wt%, Mn: 0.04 wt%, Mg: 1 wt%, the balance being Al and less than 0.15 wt% of unavoidable impurities.
The preparation process of the brazing aluminum alloy composite material comprises the following steps:
casting the skin material 1, the core material 1 and the core material 2: 3003MOD and 4004 are cast by DC, and the components are smelted and cast to obtain cast ingots; and homogenizing the core material 2, wherein the homogenizing temperature is 600 ℃, and the heat preservation time is 2 hours.
Casting, sawing and milling the skin material 1, the core material 1 and the core material 2: 3003MOD and 4004 adopt sawing machine to cut off head and tail, and mill off surface segregation layer and surface quenching layer.
Hot rolling of the skin material 1: preheating the 4004 skin material 1 cast ingot, wherein the preheating temperature is 500 ℃, and the heat preservation time is 2 h; and then, carrying out hot rolling on the preheated skin material 1 ingot until the thickness is 114mm to obtain the skin material 1.
Primary compounding: the 4004 leather material 1 and the 3003MOD core material 1 are compounded at a compounding ratio of 20%.
Primary hot rolling: preheating the first composite material after the primary compounding, wherein the preheating temperature is 500 ℃, and the heat preservation time is 2 h; the preheated first composite material is then hot rolled to a thickness of 25mm, obtaining skin material 2.
Secondary compounding: and compounding the skin material 2 and the 3003MOD core material 2 according to the compounding rate of 5% to obtain a second composite material.
Secondary hot rolling: preheating the second composite material after the secondary compounding, wherein the preheating temperature is 500 ℃, and the heat preservation time is 2 hours; then, hot rolling the preheated second composite material to the thickness of 12mm to obtain a hot rolled coil; and (5) carrying out subsequent cold rolling.
Cold rolling: and carrying out multi-pass cold rolling on the hot rolled coil to obtain the cold rolled coil with the preset annealing thickness.
Intermediate annealing: and (3) carrying out complete recrystallization annealing on the cold-rolled coil, wherein the annealing temperature is 400 ℃, and the heat preservation time is 2 hours, so that the O-state aluminum alloy coil with the thickness of 8mm is obtained.
And (3) finish rolling: and finally cold rolling the O-state aluminum alloy coil obtained after annealing according to the preset reduction of the finished product pass, wherein the preset reduction of the finished product pass is 25%, and the H14-state brazing aluminum alloy composite material with the thickness of 6.0mm and the cladding rate of 1% of the skin material is obtained.
The foregoing detailed description of the embodiments of the present application has been presented to illustrate the principles and implementations of the present application, and the description of the embodiments is only intended to facilitate the understanding of the methods and their core concepts of the present application. Meanwhile, a person skilled in the art should, according to the idea of the present application, change or modify the embodiments and applications of the present application based on the scope of the present application. In view of the above, the description should not be taken as limiting the application.
Claims (10)
1. A method for preparing a brazing aluminum alloy composite material is characterized by comprising the following steps:
primary compounding: compounding the skin material 1 and the core material 1 to obtain a first composite material;
primary hot rolling: preheating the first composite material, and carrying out hot rolling on the preheated first composite material to obtain a skin material 2;
secondary compounding: compounding the skin material 2 and the core material 2 to obtain a second composite material;
secondary hot rolling: preheating the second composite material, and carrying out hot rolling on the preheated second composite material to obtain a hot rolled coil;
cold rolling: performing multi-pass cold rolling on the hot rolled coil to obtain a cold rolled coil;
intermediate annealing: carrying out recrystallization annealing on the cold-rolled coil to obtain an O-state brazing aluminum alloy composite material;
wherein, the compounding rate of the leather material 1 is 5-20% during one-time compounding; and when the leather materials are compounded for the second time, the compounding rate of the leather materials 2 is 5-20%.
2. The method for preparing the brazing aluminum alloy composite material according to claim 1, wherein in the primary hot rolling, the preheating temperature of the first composite material is 450-550 ℃, and the heat preservation time is 2-10 hours; the thickness of the first composite material after hot rolling is 20-100 mm.
3. The method for preparing the brazing aluminum alloy composite material according to claim 1, wherein in the secondary hot rolling, the preheating temperature is 450-550 ℃, and the heat preservation time is 2-10 hours; the thickness of the second composite material after hot rolling is 5-15 mm.
4. The method for preparing the brazing aluminum alloy composite material according to claim 1, wherein in the intermediate annealing, the annealing temperature of recrystallization annealing is 300 ℃ to 500 ℃, and the holding time is 2 to 10 hours.
5. The method of producing a brazing aluminum alloy composite material according to claim 1, wherein the thickness of the O-state brazing aluminum alloy composite material is 2.0 to 10.0 mm.
6. The method of producing a brazing aluminum alloy composite material according to claim 1, further comprising finish rolling: and finally cold rolling the O-state brazing aluminum alloy composite material to obtain the H14-state brazing aluminum alloy composite material.
7. The method for preparing the brazing aluminum alloy composite material according to claim 6, wherein in the finish rolling, a cold rolling reduction ratio is 10% to 50%; the thickness of the H14-state brazing aluminum alloy composite material is 2.0-10.0 mm.
8. The method of producing a brazing aluminum alloy composite material according to claim 1,
the core material 1 and the core material 2 are the same alloy or different alloys.
9. The method of producing a brazing aluminum alloy composite material according to claim 1, wherein before the primary compounding, the method comprises:
casting: respectively casting the core material 1, the skin material 1 and the core material 2 by adopting DC (direct Current), and casting after smelting the components to obtain cast ingots of the core material 1, the core material 1 and the core material 2;
sawing and milling: respectively cutting off the head and the tail of the cast ingot of the core material 1, the skin material 1 and the core material 2 by using a sawing machine, and milling off a surface segregation layer and a surface quenching layer;
rolling the skin material 1: preheating the skin material 1 cast ingot after sawing and milling, wherein the preheating temperature is 450-550 ℃, and the heat preservation time is 2-10 h; and (3) carrying out hot rolling on the preheated skin material 1 ingot until the thickness is 20-150 mm, thus obtaining the skin material 1.
10. A brazed aluminum alloy composite material produced by the method of any one of claims 1 to 9.
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| CN117443931A (en) * | 2023-12-22 | 2024-01-26 | 冶科金属有限公司 | Austenitic stainless steel rolling equipment |
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Application publication date: 20201110 |