CN116555640A - Preparation method of aluminum alloy strip and aluminum alloy strip - Google Patents
Preparation method of aluminum alloy strip and aluminum alloy strip Download PDFInfo
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- CN116555640A CN116555640A CN202310512181.5A CN202310512181A CN116555640A CN 116555640 A CN116555640 A CN 116555640A CN 202310512181 A CN202310512181 A CN 202310512181A CN 116555640 A CN116555640 A CN 116555640A
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- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 60
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 89
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 87
- 238000005096 rolling process Methods 0.000 claims abstract description 71
- 238000000034 method Methods 0.000 claims abstract description 34
- 238000005097 cold rolling Methods 0.000 claims abstract description 12
- 238000009749 continuous casting Methods 0.000 claims abstract description 4
- 238000005098 hot rolling Methods 0.000 claims description 36
- 239000007788 liquid Substances 0.000 claims description 26
- 238000007670 refining Methods 0.000 claims description 22
- 230000008569 process Effects 0.000 claims description 21
- 238000005452 bending Methods 0.000 claims description 16
- 238000005266 casting Methods 0.000 claims description 16
- 239000000463 material Substances 0.000 claims description 16
- 238000004519 manufacturing process Methods 0.000 claims description 15
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 14
- 239000000956 alloy Substances 0.000 claims description 13
- 239000000839 emulsion Substances 0.000 claims description 12
- 238000012986 modification Methods 0.000 claims description 12
- 230000004048 modification Effects 0.000 claims description 12
- 238000000137 annealing Methods 0.000 claims description 11
- 229910045601 alloy Inorganic materials 0.000 claims description 10
- 238000004140 cleaning Methods 0.000 claims description 10
- 238000001914 filtration Methods 0.000 claims description 10
- 229910052751 metal Inorganic materials 0.000 claims description 10
- 239000002184 metal Substances 0.000 claims description 10
- 238000007872 degassing Methods 0.000 claims description 9
- 238000003801 milling Methods 0.000 claims description 9
- 238000004321 preservation Methods 0.000 claims description 9
- 239000002893 slag Substances 0.000 claims description 9
- 239000003513 alkali Substances 0.000 claims description 8
- 238000003723 Smelting Methods 0.000 claims description 7
- 229910052757 nitrogen Inorganic materials 0.000 claims description 7
- 229910052710 silicon Inorganic materials 0.000 claims description 7
- 239000010703 silicon Substances 0.000 claims description 7
- 230000002209 hydrophobic effect Effects 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 6
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 5
- 239000001257 hydrogen Substances 0.000 claims description 5
- 229910052739 hydrogen Inorganic materials 0.000 claims description 5
- 239000000155 melt Substances 0.000 claims description 4
- 229910018125 Al-Si Inorganic materials 0.000 claims description 3
- 229910018520 Al—Si Inorganic materials 0.000 claims description 3
- 229910001278 Sr alloy Inorganic materials 0.000 claims description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 3
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- 239000007789 gas Substances 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 238000005461 lubrication Methods 0.000 claims description 3
- 239000001301 oxygen Substances 0.000 claims description 3
- 229910052760 oxygen Inorganic materials 0.000 claims description 3
- 239000000843 powder Substances 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 239000004615 ingredient Substances 0.000 claims description 2
- 238000002347 injection Methods 0.000 claims description 2
- 239000007924 injection Substances 0.000 claims description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 7
- 239000000047 product Substances 0.000 description 5
- 239000011856 silicon-based particle Substances 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 210000003128 head Anatomy 0.000 description 3
- 238000003825 pressing Methods 0.000 description 3
- 238000005070 sampling Methods 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 239000004677 Nylon Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 239000011889 copper foil Substances 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 229920001778 nylon Polymers 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 238000003908 quality control method Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 239000008186 active pharmaceutical agent Substances 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
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- 239000012467 final product Substances 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 239000013072 incoming material Substances 0.000 description 1
- 210000002189 macula lutea Anatomy 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 239000010731 rolling oil Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
- C22C21/02—Alloys based on aluminium with silicon as the next major constituent
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
-
- 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
-
- 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
- C22C1/03—Making non-ferrous alloys by melting using master alloys
-
- 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
- C22C1/06—Making non-ferrous alloys with the use of special agents for refining or deoxidising
-
- 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
- C22F1/02—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working in inert or controlled atmosphere or vacuum
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
- B21B2003/001—Aluminium or its alloys
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention discloses a preparation method of an aluminum alloy strip and the aluminum alloy strip, and the method comprises the following steps: s1, preparing the following components in percentage by mass, and preparing an ingot by adopting a semi-continuous casting method; s2, performing hot continuous rolling on the aluminum ingot to obtain a hot rolled blank with the thickness of 6.0 mm; s3, cold rolling the hot rolled blank to obtain an aluminum coil with the thickness of 1.5mm; and S4, carrying out finishing straightening on the aluminum coil to obtain the aluminum alloy strip with the thickness of 1.5 mm. The aluminum alloy strip prepared by the preparation method of the aluminum alloy strip has the advantages of excellent surface quality, high tensile strength, stable thermal expansion coefficient and wide application range.
Description
[ field of technology ]
The invention relates to the technical field of aluminum processing, in particular to a preparation method of an aluminum alloy strip and the aluminum alloy strip.
[ background Art ]
With the continuous development of the electronic industry in China, aluminum-based circuit boards are widely applied. The aluminum-based circuit board is composed of a three-layer structure and generally comprises copper foil, an insulating layer and an aluminum plate. The preparation process of the common aluminum-based circuit board comprises the following steps: firstly, carrying out hard oxidation on an aluminum plate, requiring no defects such as black lines, pits and the like visible to naked eyes on the surface after oxidation, then uniformly coating an insulating layer on the aluminum plate, and finally coating a copper foil with a micron-level thickness on the insulating layer.
However, when the thickness and flatness of the whole aluminum plate fluctuate greatly, the quality of the whole circuit board will be affected, so that extremely high requirements are placed on the surface quality and the plate shape of the aluminum plate. In addition, the electronic component can generate a large amount of heat during operation, for example, when the thickness and flatness of the aluminum plate are greatly changed due to thermal expansion during circuit operation, the quality of the metallized holes and the circuit can be influenced, so that the whole component is invalid. The aluminum alloy material with the brand 4047-H24 prepared by the traditional process has high strength, but has poor surface quality and unstable thermal expansion system, so that the application of the aluminum alloy material on an aluminum-based circuit board is limited.
[ invention ]
The embodiment of the invention aims to provide a preparation method of an aluminum alloy strip and the aluminum alloy strip, which are used for solving the problems of poor stability of thermal expansion coefficient, poor surface quality and small application range of the existing aluminum alloy strip.
In order to solve the technical problems, in a first aspect, an embodiment of the present invention provides a method for preparing an aluminum alloy strip, the method for preparing an aluminum alloy strip includes the following steps:
s1, preparing the following components in percentage by mass, and preparing an ingot by adopting a semi-continuous casting method;
12.50 percent or more of Si is 12.70 percent or less, fe is 0.80 percent or less, cu is 0.30 percent or less, mg is 0.10 percent or less, mn is 0.15 percent or less, zn is 0.20 percent or less, the content of other single elements is less than 0.05 percent, and the balance is Al;
s11, adding elements into molten aluminum according to the components and mass percentages of the ingredients, wherein 99.70% of full aluminum ingot is added into a smelting furnace, the temperature of the molten aluminum is less than or equal to 750 ℃, after the temperature of a melt reaches 730-750 ℃, alloy Si element is prepared by adopting a mode of adding metal silicon, and when the Si content of the molten aluminum reaches a preset target value, component fine adjustment is performed by adopting a mode of adding Al-Si intermediate alloy;
step S12, stirring and slag skimming are carried out in the smelting furnace to obtain aluminum liquid;
s13, transferring the aluminum liquid into a heat preservation furnace for refining;
s14, slagging off and standing after refining is finished to obtain refined aluminum liquid;
step S15, degassing and filtering the refined aluminum liquid to obtain an aluminum ingot;
s2, performing hot continuous rolling on the aluminum ingot to obtain a hot rolled blank with the thickness of 6.0 mm;
s3, cold rolling the hot rolled blank to obtain an aluminum coil with the thickness of 1.5mm;
and S4, carrying out finishing straightening on the aluminum coil to obtain the aluminum alloy strip with the thickness of 1.5 mm.
Preferably, the step S2 specifically includes the following steps:
s21, milling the aluminum ingot, wherein the milling of a large surface is 20mm per surface, and the milling of an inclined surface and a vertical surface is 5mm per surface respectively;
step S22, heating the milled aluminum ingot; wherein the temperature of the heated metal is 520+/-5 ℃, and the time from metal to temperature for heat preservation is set to be 2 hours;
s23, performing 1+3 hot continuous rolling processes on the aluminum ingot to perform hot continuous rolling treatment, wherein the hot continuous rolling processes comprise 1-frame hot rolling rough rolling and 3-frame hot rolling finish rolling, and emulsion lubrication is adopted in the 1+3 hot continuous rolling processes; wherein, the hot rolling rough rolling is carried out for 21 times, the thickness of an intermediate billet obtained by the hot rolling rough rolling is 26mm, the rolling passes of a 3-frame rolling machine for hot rolling finish rolling are 26.0mm-16.0mm, 16.0mm-9.0mm and 9.0mm-6.0mm, and a hot rolling billet with the rolling thickness of 6.0mm is obtained, and the final rolling temperature is 300-310 ℃.
Preferably, the offline brush mark test is carried out before the hot rolling roller is installed, the brush mark width of the steel wire brush is 15-17mm, the brush mark width of the nylon brush is 29-31mm, the deviation of the brush mark width of the working side and the driving side of the machine frame is less than or equal to 2mm, the brush roller pressure of the hot rolling rough rolling and the hot rolling finish rolling is 3.8-4.2KN, the brush roller is put into use in 11-15 passes of hot rolling rough rolling, and the brush roller is put into use in a hot rolling finish rolling outlet; the concentration of the emulsion in hot rolling and rough rolling is controlled to be 4.0-4.3%, and the hydrophobic viscosity is controlled to be 40-43mm 2 Controlling TE at 15-18% and UA at 4-5%; the concentration of the emulsion in the hot rolling finish rolling is controlled to be 7.0-7.2%, and the hydrophobic viscosity is controlled to be 55-59mm 2 And/s, TE is controlled to be 30-34%, and UA is controlled to be 8-10%.
Preferably, the step S3 specifically includes the following steps:
s31, carrying out cold rolling on the hot-rolled blank, wherein the rolling passes of the cold rolling are 6.0mm, 4.25mm, 3.0mm, 2.12mm and 1.5mm in sequence; each pass is independently rolled, all roller systems are polished and cleaned before each pass is rolled, and the roller systems are placed for more than 20 hours after rolling, and the temperature of the rolled coil is reduced to be lower than 45 ℃ for rolling the next pass; the two-pass cogging is carried out by using a roller with the roughness of Ra0.4mu m, and the two-pass cogging is carried out by using a roller with the roughness of Ra0.28mu m;
and step S32, cleaning the cold-rolled blank by alkali liquor, wherein the pH value of the alkali liquor is 12-13, and the cleaning speed is less than or equal to 80m/min.
Preferably, the step S4 specifically includes the following steps:
carrying out stretch bending straightening on the aluminum coil by adopting a pure stretching process through a straightening unit; wherein the straightening tension is less than or equal to 1300kg, and the straightening elongation is 0.2-0.4%.
Preferably, in the step S13, 35-45kg of the granular refining agent and the Ar powder injection are used for refining for 30-35min for the first time, after the first refining, the Al-Sr alloy is used for carrying out modification treatment on the aluminum liquid, the Sr content is controlled to be 0.015% -0.025%, and pure Ar gas is used for refining for 10-15min after modification.
Preferably, in the step S15, the aluminum liquid is degassed by a degassing tank using hydrogen as a protection, and the hydrogen content is less than 0.15mL/100gAl; the aluminum liquid after the degassing treatment is filtered by a filter box, and the filter box adopts a 40PPi+60PPi filter plate to realize two-stage filtration; finally, the aluminum liquid after the filtering treatment is cast by a crystallizer, the casting temperature is 670-685 ℃, the casting speed is 38-40mm/min, and the casting water flow is 220-270L/min, so that an aluminum ingot is obtained.
Preferably, the preparation method further comprises a step S33 of carrying out finished product annealing on the cold-rolled blank, wherein the finished product annealing temperature is 180+/-5 ℃, and the heat preservation is carried out for 5.5 hours; the oxygen content in the furnace is less than or equal to 700ppm by adopting nitrogen protection.
Preferably, after removing the head material through stretch bending straightening treatment, sampling, and detecting the plate shape by sampling 1000mm of sample openings, wherein the transverse bending is less than or equal to 2mm, and the longitudinal bending is less than or equal to 2mm.
In a second aspect, the invention provides an aluminum alloy strip, which comprises the following components in percentage by mass:
12.50 percent or more of Si is 12.70 percent or less, fe is 0.80 percent or less, cu is 0.30 percent or less, mg is 0.10 percent or less, mn is 0.15 percent or less, zn is 0.20 percent or less, the content of other single elements is less than 0.05 percent, and the balance is Al;
the aluminum alloy strip is prepared by the preparation method of the aluminum alloy strip.
Compared with the prior art, the preparation method of the aluminum alloy strip improves the aluminum alloy based on 4047-H24 in the prior art, and realizes the stability of the thermal expansion coefficient of the material in the use process by carrying out modification treatment on the melt and strict control on the silicon content in the casting process; the surface quality of the strip is ensured to be excellent, black lines are avoided, and the surface requirements of 4047-H24 aluminum alloy strips for aluminum-based circuit boards are met through a 2-time refining process of casting, a two-stage filtering, a hot rolling brush roller process, emulsion index control, an alkali washing process of cold rolling and cleaning, a nitrogen protection annealing process and a pure stretching and straightening process; the mechanical property requirement of the material is realized through the accurate control of the annealing temperature, the tensile strength is 150-200 MPa, the yield strength is more than or equal to 125MPa, the elongation is more than or equal to 3%, the Webster hardness is 6-10, and the performance requirement of clients is met.
[ description of the drawings ]
For a clearer description of the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments will be briefly introduced below, it being obvious that the drawings in the description below are only some embodiments of the present invention, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art, wherein:
FIG. 1 is a flow chart of a method of producing an aluminum alloy strip according to an embodiment of the present invention;
FIG. 2 is a sub-flowchart of step S1 of the method for producing an aluminum alloy strip according to an embodiment of the present invention;
FIG. 3 is a sub-flowchart of step S2 of the method for producing an aluminum alloy strip according to an embodiment of the present invention;
FIG. 4 is a sub-flowchart of step S3 of the method for producing an aluminum alloy strip according to an embodiment of the present invention;
FIG. 5 is a schematic view showing that silicon particles of aluminum ingot slices are needle-shaped before modification treatment in the method for preparing an aluminum alloy strip according to the embodiment of the invention;
FIG. 6 is a schematic view showing that silicon particles of aluminum ingot slices are spherical after modification treatment in the method for preparing an aluminum alloy strip according to the embodiment of the invention;
fig. 7 is a schematic diagram of uniform and fine distribution of finished silicon particles after modification treatment in the method for preparing an aluminum alloy strip according to the embodiment of the invention.
[ detailed description ] of the invention
The following description of the technical solutions in the embodiments of the present invention will be clear and complete, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The embodiment of the invention provides a preparation method of an aluminum alloy strip, which is prepared by improving an aluminum alloy material based on the trademark 4047-H24 so as to meet the requirements of an aluminum-based circuit board. Referring to fig. 1, the method for preparing the aluminum alloy strip according to the present embodiment includes the following steps:
s1, preparing the following components in percentage by mass, and preparing cast ingots by adopting a semi-continuous casting method.
12.50% or more of Si 12.70% or less, fe 0.80% or less, cu 0.30% or less, mg 0.10% or less, mn 0.15% or less, zn 0.20% or less, the content of the rest single elements less than 0.05%, and the balance of Al.
Referring to fig. 2, in step S11, 99.70% of all-aluminum ingots are added into a smelting furnace for production, the temperature of molten aluminum is less than or equal to 750 ℃, after the temperature of molten aluminum reaches 730-750 ℃, the Si element of the alloy is prepared by adding metallic silicon, and when the Si content of the molten aluminum reaches a preset target value, fine adjustment of components is performed by adding an Al-Si intermediate alloy, and other alloys are not prepared and added additionally.
Wherein, the alloy Si is prepared by adopting high-purity metal silicon which is the pure metal silicon with the brand number of 2202.
And step S12, stirring and slag skimming are carried out in the smelting furnace, and molten aluminum is obtained.
Specifically, electromagnetic stirring is carried out in the smelting furnace for more than 20min, and the electromagnetic stirring time is more than or equal to 30min; and mechanically stirring for 10-15min to obtain aluminum liquid. So that the chemical components are uniform, and the slag is removed by the slag removing vehicle.
And S13, transferring the aluminum liquid into a heat preservation furnace for refining.
Specifically, 35-45kg of granular refining agent and Ar powder spraying are used for refining for 30-35min for the first time, after the first refining is finished, al-Sr alloy is used for carrying out modification treatment on aluminum liquid, the Sr content is controlled within 0.015-0.025%, and pure Ar gas is used for refining for 10-15min after modification is finished. Thus, by adopting a twice refining method, the possibility of black lines generated on the oxidized surface of the subsequent finished product is reduced. Before the aluminum liquid is not subjected to modification treatment, the ingot casting slice silicon particles are needle-shaped, as shown in fig. 5. In this embodiment, the Al-Sr intermediate alloy is used to modify the aluminum liquid, so that the ingot can obtain spherical silicon structure, as shown in fig. 6, and the final product can obtain uniformly and finely distributed silicon particles, as shown in fig. 7, which are beneficial to the stability of thermal expansion coefficient of the material.
And S14, slagging off and standing after refining is finished to obtain refined aluminum liquid.
Wherein, slag is removed after refining, and the slag is kept stand for 30-40min to suspend the slag.
And S15, degassing and filtering the refined aluminum liquid to obtain aluminum ingots.
Specifically, the aluminum liquid is subjected to degassing in a degassing tank in sequence, and the hydrogen content is less than 0.15mL/100gAl; secondly, two-stage filtration is carried out by a filter plate of 40PPi+60PPi through a filter box; finally, casting the aluminum liquid by using a crystallizer at 670-685 ℃ and casting speed of 38-40mm/min and casting water flow of 220-270L/min to obtain qualified aluminum ingots. The possibility of material casting cracking is reduced through the casting technology with low speed, low temperature and low liquid level, and the strength is high.
And S2, performing hot continuous rolling on the aluminum ingot to obtain a hot rolled blank with the thickness of 6.0 mm.
S3, cold rolling the hot rolled blank to obtain an aluminum coil with the thickness of 1.5mm;
and S4, carrying out finishing straightening on the aluminum coil to obtain the aluminum alloy strip with the thickness of 1.5 mm. And the plate shape control, the pure stretching straightening is adopted to replace the straightening of the traditional straightener, so that the pit pressing caused by aluminum powder generated in the straightening process is avoided.
In this embodiment, please refer to fig. 3, wherein the step S2 specifically includes the following steps:
s21, milling the aluminum ingot, wherein the milling of a large surface is 20mm per surface, and the milling of an inclined surface and a vertical surface is 5mm per surface respectively; can mill cold partition, slag inclusion and the like clean, and has good cleaning effect.
Step S22, heating the milled aluminum ingot; wherein the temperature of the heated metal is 520+/-5 ℃, and the time from metal to temperature for heat preservation is set to be 2 hours. Therefore, the edge part can be prevented from cracking in the alloy rolling process, and the surface quality is good.
And S23, performing hot continuous rolling treatment on the aluminum ingot by a 1+3 hot continuous rolling process, wherein the hot continuous rolling treatment comprises 1 frame hot rolling rough rolling and 3 frames hot rolling finish rolling, and emulsion lubrication is adopted in the 1+3 hot continuous rolling process. According to the automatic issuing rolling parameter data of the secondary system, the thickness of an intermediate blank obtained by hot rolling rough rolling is 26mm, the rolling passes of a 3-frame rolling mill for hot rolling finish rolling are 26.0mm-16.0mm, 16.0mm-9.0mm and 9.0mm-6.0mm, a hot rolled blank with the rolling thickness of 6.0mm is obtained, and the final rolling temperature is 300-310 ℃.
In the embodiment, the offline brush mark test is carried out before the hot rolling roller is installed, the brush mark width of the steel wire brush is 15-17mm, the brush mark width deviation of the nylon brush is 29-31mm, the brush mark width deviation of the working side and the driving side of the frame is less than or equal to 2mm, the brush roller pressure of the hot rolling rough rolling and the hot rolling finish rolling is 3.8-4.2KN, the brush roller is put into use in 11-15 passes of hot rolling rough rolling, and the brush roller is put into use in a finish rolling outlet; the concentration of the hot-rolled rough-rolled emulsion is controlled to be 4.0-4.3%, and the hydrophobic viscosity is controlled to be 40-43mm 2 Controlling TE at 15-18% and UA at 4-5%; the concentration of the hot rolling finish rolling emulsion is controlled to be 7.0-7.2%, and the hydrophobic viscosity is controlled to be 55-59mm 2 And/s, TE is controlled to be 30-34%, and UA is controlled to be 8-10%. Through brush mark test and effective control of the brush roll put into use, the control of emulsion index ensures that the surface of the hot rolled coil has no black wire and black line, thereby being beneficial to the surface quality control of the hot rolled coil.
The working side of the frame is the OS side, the driving side is the DS side, and the OS side is the WS side used for uncoiling of the foil mill and is the working side. The DS-drive side, i.e., the side of the frame motor. TE is denoted as grease and UA is denoted as unbound acid.
In this embodiment, please refer to fig. 4, wherein the step S3 specifically includes the following steps:
s31, carrying out cold rolling on the hot-rolled blank, wherein the rolling passes of the cold rolling are 6.0mm, 4.25mm, 3.0mm, 2.12mm and 1.5mm in sequence; each pass is independently rolled, all roller systems are polished and cleaned before each pass is rolled, and the roller systems are placed for more than 20 hours after rolling, and the temperature of the rolled coil is reduced to be lower than 45 ℃ for rolling the next pass; the two-pass cogging is carried out by using a roller with the roughness of Ra0.4mu m, and the two-pass cogging is carried out by using a roller with the roughness of Ra0.28mu m. The surface quality of the hot rolled incoming material is well improved through the control of roller roughness and rolling pass, the surface quality of the strip is effectively controlled, and the requirement of high surface is met.
And step S32, cleaning the cold-rolled blank by alkali liquor, wherein the pH value of the alkali liquor is 12-13, and the cleaning speed is less than or equal to 80m/min. And (5) removing rolling oil and aluminum powder by cleaning. The surface of the cleaned aluminum is clean, and the problems of surface quality such as pit pressing, scratch and the like caused by foreign matters during withdrawal, straightening and straightening can be avoided.
S33, carrying out finished product annealing on the cold-rolled blank, wherein the finished product annealing temperature is 180+/-5 ℃, carrying out punching temperature measurement through a thermocouple, monitoring the temperature change of the aluminum coil at any time, and carrying out heat preservation for 5.5 hours; the oxygen content in the furnace is less than or equal to 700ppm by adopting nitrogen protection. The annealing process system can ensure that the mechanical property of the material meets the performance requirement of 4047-H24, the tensile strength is 150-200 MPa, the yield strength is more than or equal to 125MPa, the elongation is more than or equal to 3 percent and the Webster hardness is 6-10. The nitrogen protection ensures that the surface has no defects of yellow spots, chromatic aberration and the like. The stable control of the mechanical properties of the material is realized by controlling the annealing temperature and the heat preservation time; through nitrogen protection, the invention ensures no macula lutea and color difference, and is beneficial to the surface quality control of the invention.
In this embodiment, the step S4 specifically includes: carrying out stretch bending straightening on the aluminum coil by adopting a pure stretching process through a straightening unit; wherein the straightening tension is less than or equal to 1300kg, and the straightening elongation is 0.2-0.4%.
Specifically, a pure stretching and straightening process is adopted, but a straightening unit is adopted, the tension is controlled at 1300kg during straightening, the straightening elongation is controlled at 0.2-0.4%, a sample is taken after head materials are removed during straightening, 1000mm samples are taken, the shape of the sample is detected, the transverse bending is ensured to be less than or equal to 2mm, and the longitudinal bending is ensured to be less than or equal to 2mm. Through control of the straightening process and detection of the finished plate shape, the plate shape is ensured to meet the requirements of customers, the plate shape control of the invention is facilitated, and pure stretch straightening is adopted to replace the straightening of the traditional straightener, so that the pit pressing caused by aluminum powder generated in the straightening process is avoided.
Specifically, after the head material is removed through stretch bending and straightening treatment, sampling is carried out, a 1000mm sample port is sampled, the shape is detected, the transverse bending of the shape is less than or equal to 2mm, the longitudinal bending is less than or equal to 2mm, and the shape requirement is completely met.
The beneficial effects of the invention are as follows:
(1) The thickness is 1.5 (-0.04 to-0.02) mm, the tensile strength is 150-200 MPa, the yield strength is more than or equal to 125MPa, the elongation is more than or equal to 3%, and the Webster hardness is 6-10.
(2) The thermal expansion coefficient (20-300 ℃) is stably controlled at 19 multiplied by 10- 6 /K～21×10- 6 /K。
(3) The surface quality is excellent, and the hard oxidized surface has no any type of pits and other defects visible to naked eyes, such as black lines, oil spots, scratches and the like.
(4) And (3) cutting the straightened coiled material into 1000mm template, wherein the transverse bending of the coiled material is less than or equal to 2mm, and the longitudinal bending of the coiled material is less than or equal to 2mm, so that the requirement of the coiled material on the shape is completely met.
Compared with the prior art, the preparation method of the aluminum alloy strip improves the aluminum alloy based on 4047-H24 in the prior art, and realizes the stability of the thermal expansion coefficient of the material in the use process by carrying out modification treatment on the melt and strict control on the silicon content in the casting process; the surface quality of the strip is ensured to be excellent, black lines are avoided, and the surface requirements of 4047-H24 aluminum alloy strips for aluminum-based circuit boards are met through a 2-time refining process of casting, a two-stage filtering, a hot rolling brush roller process, emulsion index control, an alkali washing process of cold rolling and cleaning, a nitrogen protection annealing process and a pure stretching and straightening process; the mechanical property requirement of the material is realized through the accurate control of the annealing temperature, the tensile strength is 150-200 MPa, the yield strength is more than or equal to 125MPa, the elongation is more than or equal to 3%, the Webster hardness is 6-10, and the performance requirement of clients is met.
The embodiment of the invention also provides an aluminum alloy strip, which comprises the following components in percentage by mass:
12.50 percent or more of Si is 12.70 percent or less, fe is 0.80 percent or less, cu is 0.30 percent or less, mg is 0.10 percent or less, mn is 0.15 percent or less, zn is 0.20 percent or less, the content of other single elements is less than 0.05 percent, and the balance is Al; the aluminum alloy strip is prepared by the preparation method of the aluminum alloy strip. The aluminum alloy strip produced by the invention has the advantages of moderate strength, good surface quality, stable thermal expansion coefficient and the like.
When the aluminum alloy strip is used as an aluminum substrate, the thickness of the strip is 1.5mm, and the test data are as follows:
(1) The tensile strength is 160MPa, the yield strength is 140MPa, the elongation is 18%, the Webster hardness is 7, and the comprehensive mechanical properties are excellent.
(2) The thermal expansion coefficient (20-300 ℃) is stably controlled at 19 multiplied by 10- 6 /K-21×10- 6 /K。
(3) Proved by verification, the surface quality and the shape are excellent, no obvious change of thickness and shape occurs in the circuit operation process, the circuit operation is stable, and the customer is very satisfied.
Since the aluminum alloy strip in this embodiment is produced by the production method of the aluminum alloy strip in the above embodiment, it can also achieve the technical effects achieved by the production method of the aluminum alloy strip in the above embodiment.
The foregoing description is only illustrative of the present invention and is not intended to limit the scope of the invention, and all equivalent structures or equivalent processes or direct or indirect application in other related technical fields are included in the scope of the present invention.
Claims (10)
1. The preparation method of the aluminum alloy strip is characterized by comprising the following steps of:
s1, preparing the following components in percentage by mass, and preparing an ingot by adopting a semi-continuous casting method;
12.50 percent or more of Si is 12.70 percent or less, fe is 0.80 percent or less, cu is 0.30 percent or less, mg is 0.10 percent or less, mn is 0.15 percent or less, zn is 0.20 percent or less, the content of other single elements is less than 0.05 percent, and the balance is Al;
s11, adding elements into molten aluminum according to the components and mass percentages of the ingredients, wherein 99.70% of full aluminum ingot is added into a smelting furnace, the temperature of the molten aluminum is less than or equal to 750 ℃, after the temperature of a melt reaches 730-750 ℃, alloy Si element is prepared by adopting a mode of adding metal silicon, and when the Si content of the molten aluminum reaches a preset target value, component fine adjustment is performed by adopting a mode of adding Al-Si intermediate alloy;
step S12, stirring and slag skimming are carried out in the smelting furnace to obtain aluminum liquid;
s13, transferring the aluminum liquid into a heat preservation furnace for refining;
s14, slagging off and standing after refining is finished to obtain refined aluminum liquid;
step S15, degassing and filtering the refined aluminum liquid to obtain an aluminum ingot;
s2, performing hot continuous rolling on the aluminum ingot to obtain a hot rolled blank with the thickness of 6.0 mm;
s3, cold rolling the hot rolled blank to obtain an aluminum coil with the thickness of 1.5mm;
and S4, carrying out finishing straightening on the aluminum coil to obtain the aluminum alloy strip with the thickness of 1.5 mm.
2. The method for producing an aluminum alloy strip according to claim 1, wherein the step S2 comprises the steps of:
s21, milling the aluminum ingot, wherein the milling of a large surface is 20mm per surface, and the milling of an inclined surface and a vertical surface is 5mm per surface respectively;
step S22, heating the milled aluminum ingot; wherein the temperature of the heated metal is 520+/-5 ℃, and the time from metal to temperature for heat preservation is set to be 2 hours;
s23, performing 1+3 hot continuous rolling processes on the aluminum ingot to perform hot continuous rolling treatment, wherein the hot continuous rolling processes comprise 1-frame hot rolling rough rolling and 3-frame hot rolling finish rolling, and emulsion lubrication is adopted in the 1+3 hot continuous rolling processes; wherein, the hot rolling rough rolling is carried out for 21 times, the thickness of an intermediate billet obtained by the hot rolling rough rolling is 26mm, the rolling passes of a 3-frame rolling machine for hot rolling finish rolling are 26.0mm-16.0mm, 16.0mm-9.0mm and 9.0mm-6.0mm, and a hot rolling billet with the rolling thickness of 6.0mm is obtained, and the final rolling temperature is 300-310 ℃.
3. The method for producing an aluminum alloy strip according to claim 2, wherein the brush mark width of the wire brush is 15-17mm, the brush mark width deviation of the working side and the driving side of the stand is less than or equal to 2mm, the brush roll pressure of the hot-rolling rough rolling and the hot-rolling finish rolling is 3.8-4.2KN, the hot-rolling rough rolling is put into use in 11-15 passes, and the hot-rolling finish rolling outlet is put into use; the concentration of the emulsion in hot rolling and rough rolling is controlled to be 4.0-4.3%, and the hydrophobic viscosity is controlled to be 40-43mm 2 Controlling TE at 15-18% and UA at 4-5%; the concentration of the emulsion in the hot rolling finish rolling is controlled to be 7.0-7.2%, and the hydrophobic viscosity is controlled to be 55-59mm 2 And/s, TE is controlled to be 30-34%, and UA is controlled to be 8-10%.
4. The method for producing an aluminum alloy strip according to claim 1, wherein the step S3 comprises the steps of:
s31, carrying out cold rolling on the hot-rolled blank, wherein the rolling passes of the cold rolling are 6.0mm, 4.25mm, 3.0mm, 2.12mm and 1.5mm in sequence; each pass is independently rolled, all roller systems are polished and cleaned before each pass is rolled, and the roller systems are placed for more than 20 hours after rolling, and the temperature of the rolled coil is reduced to be lower than 45 ℃ for rolling the next pass; the two-pass cogging is carried out by using a roller with the roughness of Ra0.4mu m, and the two-pass cogging is carried out by using a roller with the roughness of Ra0.28mu m;
and step S32, cleaning the cold-rolled blank by alkali liquor, wherein the pH value of the alkali liquor is 12-13, and the cleaning speed is less than or equal to 80m/min.
5. The method for producing an aluminum alloy strip according to claim 1, wherein the step S4 comprises the steps of:
carrying out stretch bending straightening on the aluminum coil by adopting a pure stretching process through a straightening unit; wherein the straightening tension is less than or equal to 1300kg, and the straightening elongation is 0.2-0.4%.
6. The method for producing an aluminum alloy strip according to claim 1, wherein in the step S13, 35-45kg of the granular refining agent and the Ar powder injection are used for refining for 30-35min for the first time, the aluminum liquid is subjected to a modification treatment with an Al-Sr alloy after the first refining is completed, the Sr content is controlled to be 0.015% -0.025%, and pure Ar gas is used for refining for 10-15min after the modification is completed.
7. The method for producing an aluminum alloy strip according to claim 1, wherein in the step S15, the aluminum liquid is degassed by a degassing tank using hydrogen as a protection, and the hydrogen content is less than 0.15mL/100 ga; the aluminum liquid after the degassing treatment is filtered by a filter box, and the filter box adopts a 40PPi+60PPi filter plate to realize two-stage filtration; finally, the aluminum liquid after the filtering treatment is cast by a crystallizer, the casting temperature is 670-685 ℃, the casting speed is 38-40mm/min, and the casting water flow is 220-270L/min, so that an aluminum ingot is obtained.
8. The method for producing an aluminum alloy strip according to claim 4, further comprising step S33 of finish annealing the cold rolled blank at 180±5 ℃ for 5.5 hours; the oxygen content in the furnace is less than or equal to 700ppm by adopting nitrogen protection.
9. The method for producing an aluminum alloy strip according to claim 5, wherein the strip is sampled after removing the head material by stretch bending straightening, and the sample port of 1000mm is sampled to detect the shape of the strip, so that the transverse bending is less than or equal to 2mm and the longitudinal bending is less than or equal to 2mm.
10. The aluminum alloy strip is characterized by comprising the following components in percentage by mass:
12.50 percent or more of Si is 12.70 percent or less, fe is 0.80 percent or less, cu is 0.30 percent or less, mg is 0.10 percent or less, mn is 0.15 percent or less, zn is 0.20 percent or less, the content of other single elements is less than 0.05 percent, and the balance is Al;
the aluminum alloy strip is produced by the method for producing an aluminum alloy strip as defined in any one of claims 1 to 9.
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