CN115007646A - Rolling production process of ultrathin aluminum alloy strip - Google Patents
Rolling production process of ultrathin aluminum alloy strip Download PDFInfo
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- CN115007646A CN115007646A CN202210463361.4A CN202210463361A CN115007646A CN 115007646 A CN115007646 A CN 115007646A CN 202210463361 A CN202210463361 A CN 202210463361A CN 115007646 A CN115007646 A CN 115007646A
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- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 72
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 32
- 230000001050 lubricating effect Effects 0.000 claims abstract description 22
- 238000010438 heat treatment Methods 0.000 claims abstract description 20
- 238000012545 processing Methods 0.000 claims abstract description 20
- 239000000463 material Substances 0.000 claims abstract description 12
- 238000009826 distribution Methods 0.000 claims abstract description 7
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- 238000001816 cooling Methods 0.000 claims description 16
- 238000000034 method Methods 0.000 claims description 11
- 238000001514 detection method Methods 0.000 claims description 10
- 238000003723 Smelting Methods 0.000 claims description 8
- 239000002253 acid Substances 0.000 claims description 8
- 239000004519 grease Substances 0.000 claims description 8
- 238000005098 hot rolling Methods 0.000 claims description 8
- 239000007788 liquid Substances 0.000 claims description 8
- 238000004321 preservation Methods 0.000 claims description 7
- 239000007921 spray Substances 0.000 claims description 7
- 238000005097 cold rolling Methods 0.000 claims description 6
- 239000000956 alloy Substances 0.000 claims description 5
- 241000270722 Crocodylidae Species 0.000 claims description 4
- 238000005266 casting Methods 0.000 claims description 4
- 238000007872 degassing Methods 0.000 claims description 4
- LNNWVNGFPYWNQE-GMIGKAJZSA-N desomorphine Chemical compound C1C2=CC=C(O)C3=C2[C@]24CCN(C)[C@H]1[C@@H]2CCC[C@@H]4O3 LNNWVNGFPYWNQE-GMIGKAJZSA-N 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 4
- 238000001914 filtration Methods 0.000 claims description 4
- 238000000265 homogenisation Methods 0.000 claims description 4
- 238000003801 milling Methods 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 4
- 239000002994 raw material Substances 0.000 claims description 4
- 238000007670 refining Methods 0.000 claims description 4
- 239000003513 alkali Substances 0.000 claims description 2
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- SNAAJJQQZSMGQD-UHFFFAOYSA-N aluminum magnesium Chemical compound [Mg].[Al] SNAAJJQQZSMGQD-UHFFFAOYSA-N 0.000 description 1
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Images
Classifications
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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
- B21B1/22—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 plates, strips, bands or sheets of indefinite length
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- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/004—Heating the product
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
- B21B45/0203—Cooling
- B21B45/0209—Cooling devices, e.g. using gaseous coolants
- B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
- B21B45/0218—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes for strips, sheets, or plates
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
- B21B45/0239—Lubricating
- B21B45/0245—Lubricating devices
- B21B45/0248—Lubricating devices using liquid lubricants, e.g. for sections, for tubes
- B21B45/0251—Lubricating devices using liquid lubricants, e.g. for sections, for tubes for strips, sheets, or plates
-
- 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
- B21B1/22—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 plates, strips, bands or sheets of indefinite length
- B21B2001/225—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 plates, strips, bands or sheets of indefinite length by hot-rolling
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2261/00—Product parameters
- B21B2261/02—Transverse dimensions
- B21B2261/04—Thickness, gauge
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2261/00—Product parameters
- B21B2261/20—Temperature
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- 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
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
Abstract
The invention relates to a rolling production process of an ultrathin aluminum alloy strip, which sequentially comprises material selection, heating, hot rough rolling, hot finish rolling, uncoiling inspection and post-treatment, is designed from the aspects of a heating system, rolling passes, lubricating and cooling medium management, rolling processing rate distribution and the like, and breaks through the thickness specification limit of a hot continuous rolling product in the current industry by controlling key points such as chemical components, intermediate billet thickness, large reduction, acceleration rate, spraying mode and the like, so that the size and the shape of the hot continuous rolling ultrathin specification strip with the thickness of 1.5mm can be ensured to be normal according to the rolling production process; provides a new idea and direction for further reducing the production cost of the whole product in the aluminum processing industry.
Description
Technical Field
The invention belongs to the technical field of preparation and processing of aluminum profiles, relates to a rolling production process of an ultrathin aluminum alloy strip, and particularly relates to a rolling production process of an ultrathin aluminum alloy strip which is suitable for 1xxx, 3xxx, 6xxx and 8xxx series and is produced by using a hot continuous rolling mill.
Background
Light weight and high speed become important marks of modern transportation, aluminum alloy materials are effective measures for reducing the self weight of the vehicle body, and the structural parts for the aluminum alloy vehicle body are vigorously developed and manufactured in various countries in the world to adapt to development. The preparation technology development of the high-quality ultrathin ultra-wide aluminum alloy member plays a crucial role in promoting the development of the transportation industry.
The minimum thickness specification of the high-quality ultrathin aluminum alloy strip can be realized to be 2.0mm by the hot continuous rolling mill rolling technology in the industry at present; the production of products with the thickness of 1.5mm in the current industry is mainly realized by hot rolling for 2.5-3.0mm and then cold rolling for 1 pass; the existing rolling technology has long production period and high processing cost, and the rolling technology of the hot continuous rolling mill for producing ultrathin products can greatly shorten the production period and reduce the processing and production cost.
Disclosure of Invention
In view of the above, the invention provides a rolling production process for an ultrathin aluminum alloy strip, which aims to solve the problems that the ultrathin aluminum alloy strip with the minimum thickness of 2.0mm can be realized by the hot continuous rolling mill rolling technology in the prior art, the 1.5mm ultrathin aluminum alloy strip cannot be directly rolled and produced, the production cycle is influenced, and the production cost is increased.
In order to achieve the purpose, the invention provides the following technical scheme:
a rolling production process of an ultrathin aluminum alloy strip comprises the following steps:
A. selecting materials: comprehensively considering the characteristics and equipment capacity of each series of aluminum alloy materials, selecting an aluminum alloy series for preparing the ultrathin aluminum alloy strip, and batching the components according to the weight percentage;
B. heating: adding the prepared aluminum alloy raw materials into a smelting furnace, uniformly mixing, smelting to obtain liquid aluminum alloy, performing standing, refining, slagging off, online degassing and filtering, casting the liquid aluminum alloy into aluminum alloy ingots, performing saw cutting and surface milling on the aluminum alloy ingots, and heating in a heating furnace at the temperature of 480-520 ℃ for 2-3 h;
C. hot rough rolling: discharging the aluminum alloy ingot after heating and heat preservation for hot rolling, wherein the rolling pass is 13, when the thickness of the intermediate blank is 110-120 mm, the head and tail crocodile mouths are cut off, then, 4-pass rolling is continuously and repeatedly carried out, the thickness of the intermediate blank is 24-25 mm, the single-pass rolling reduction is 15-40 mm, the rolling speed is 1.9-3.2 m/s, and the temperature of the intermediate blank is 400-460 ℃;
D. hot finish rolling: the method comprises the steps of thinning a plate blank rolled to the thickness of 24-25 mm by a hot rough rolling mill to the thickness of 1.5 +/-0.03 mm through four racks of hot finish rolling one by one to be coiled, wherein the final rolling temperature is 300-320 ℃, the processing rate distribution mode of F1-F4 racks adopts (49 +/-1)% - (51 +/-1)% - (50 +/-1)%, and the outlet tension among F1-F4 racks and the outlet tension of the F4 rack are set to be 9-11-14-19N/mm 2 ；
E. Uncoiling inspection: uncoiling the coiled material after coiling, checking the product size according to the product size and surface quality requirements, and performing product size detection and alkali washing treatment, wherein the thickness tolerance of the aluminum alloy coiled material is +/-0.03 mm, the width tolerance is 0-5 mm, the convexity is 0-0.6%, and the | wedge | is less than or equal to 0.35%;
F. and (3) post-treatment: and slowly cooling the coil qualified in product quality judgment to room temperature, and then performing subsequent processing by transferring a cold rolling process.
Further, the aluminum alloy series for the ultra-thin aluminum alloy strip in step a is 1xxx, 3xxx, 6xxx, or 8xxx series.
And further, homogenizing the cast aluminum alloy ingot in the step B in a homogenizing furnace, wherein the temperature of the homogenizing treatment is 550-600 ℃, and the heat preservation time is 8-12 h.
Further, in the step C, the first 13 passes of rolling in the hot rough rolling adopt small rolling reduction in the first and last passes and large rolling reduction in the middle pass.
And step C, considering the lubricating and cooling performances of the lubricating and cooling medium in the hot rough rolling process, controlling the concentration of the emulsion in the hot rough rolling to be 3.5-3.6%, the content of the lubricating grease to be 21-22%, the content of the non-combined acid to be 4.1-4.2%, the temperature of an emulsion system to be 56 ℃ and the pressure of the emulsion system to be 4.5 bar.
Further, in the step D, in the hot finish rolling, the cooling mode of the F1-F4 machine frame spray beam adopts an inlet cooling spray beam and an outlet cooling spray beam.
And step D, considering the lubricating and cooling performances of a lubricating and cooling medium in the hot finish rolling process, controlling the concentration of a finish rolling emulsion to be 7.0-7.1%, the content of lubricating grease to be 30.5-31.5%, the content of non-combined acid to be 10.5-11.5%, the temperature of an emulsion system to be 56 ℃, and the pressure of the emulsion system to be 4.5 bar.
The invention has the beneficial effects that:
1. the rolling production process of the ultrathin aluminum alloy strip disclosed by the invention is designed from the aspects of a heating system, rolling passes, lubricating and cooling medium management, rolling processing rate distribution and the like, and breaks through the thickness specification limit of hot continuous rolling products in the current industry by controlling key points such as chemical components, intermediate billet thickness, large reduction, acceleration rate, spraying mode and the like, so that the size and the plate shape of the 1.5mm hot rolling ultrathin specification strip can be ensured to be normal according to the rolling production process; provides a new idea and direction for further reducing the production cost of the whole product in the aluminum processing industry.
2. According to the rolling production process of the ultrathin aluminum alloy strip, the product with the thickness specification within the range of 1.5-2.0mm is produced through the thinning hot rolling process, so that the processing pass and the processing time of the cold rolling process are reduced, the processing efficiency of the whole link is improved, the whole production period of ordered products is shortened, the whole production and processing cost is reduced, and the market competitive advantage of the product is improved; the stability of the strip shape is effectively ensured through the monitoring of the temperature of the emulsion in the hot finish rolling production process, the pressure setting of an emulsion system, the use control of a spray beam spraying mode and the reasonable distribution mode of the using quantity and the processing rate of the frames.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.
Drawings
For the purposes of promoting a better understanding of the objects, aspects and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:
FIG. 1 is a first schematic structural diagram of an aluminum alloy coiled material after being rolled by the rolling production process of the ultrathin aluminum alloy strip in the embodiment 1 of the invention;
fig. 2 is a schematic structural diagram of an aluminum alloy coil rolled by the rolling production process of the ultrathin aluminum alloy strip in embodiment 1 of the invention.
Detailed Description
The following embodiments of the present invention are provided by way of specific examples, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and examples may be combined with each other without conflict.
Wherein the showings are for the purpose of illustration only and not for the purpose of limiting the invention, shown in the drawings are schematic representations and not in the form of actual drawings; for a better explanation of the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not an indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes, and are not to be construed as limiting the present invention, and the specific meaning of the terms may be understood by those skilled in the art according to specific situations.
Example 1
A rolling production process of an ultrathin aluminum alloy strip comprises the following steps:
A. selecting materials: according to the characteristics of the aluminum alloy material and the condition of an order, 3004 aluminum-manganese alloy for preparing the ultrathin aluminum alloy strip is selected, and the components are mixed according to the weight percentage.
B. Heating: adding the prepared aluminum alloy raw material into a smelting furnace, uniformly mixing, smelting into liquid aluminum alloy, performing standing, refining, slagging off, online degassing and filtering, casting the liquid aluminum alloy into an aluminum alloy ingot, and homogenizing the cast aluminum alloy ingot in a homogenizing furnace at the temperature of 600 ℃ for 10 hours; and (3) after the homogenization treatment, placing the aluminum alloy ingot in a heating furnace for heating after sawing and milling the surface, wherein the temperature of the heating furnace is 480 ℃, and the heat preservation time is 2 hours.
C. Hot rough rolling: discharging the aluminum alloy ingot after heating and heat preservation for hot rolling, wherein the rolling pass is 13, when the thickness of the intermediate blank is 112mm, the head and tail crocodile mouths are cut off, then, the rolling is carried out repeatedly for 4 passes until the thickness of the intermediate blank is 24mm, the single-pass reduction is 15-40 mm, the rolling speed is 2.1-3.2 m/s, and the temperature of the intermediate blank is 400-460 ℃; in order to give consideration to the lubricating and cooling performances of a lubricating and cooling medium in the hot rough rolling process, the concentration of an emulsion in the hot rough rolling process is controlled to be 3.5-3.6%, the content of lubricating grease is controlled to be 21-22%, the content of non-combined acid is controlled to be 4.1-4.2%, the temperature of an emulsion system is controlled to be 56 ℃, and the pressure of the emulsion system is controlled to be 4.5 bar.
D. Hot finish rolling: the method comprises the steps of reducing a plate blank rolled to the thickness of 24mm by a hot rough rolling mill to the thickness of 1.5 +/-0.03 mm through four racks for hot finish rolling one by one, coiling the plate blank, wherein the finish rolling temperature is 300-320 ℃, the processing rate distribution mode of F1-F4 racks is 49-51-50%, and the outlet tensions of F1-F4 racks and F4 racks are set to be 9-11-14-19N/mm 2 (ii) a In order to give consideration to the lubricating and cooling performances of a lubricating and cooling medium in the hot finish rolling process, the concentration of a finish rolling emulsion is controlled to be 7.0-7.1%, the content of lubricating grease is controlled to be 30.5-31.5%, the content of non-bound acid is controlled to be 10.5-11.5%, the temperature of an emulsion system is controlled to be 56 ℃, and the pressure of the emulsion system is controlled to be 4.5 bar.
E. Uncoiling and checking: uncoiling the coiled material after coiling, and examining, wherein the actual detection thickness is 1.512mm, the actual detection width is 1138mm, the actual detection convexity is 0.34%, and the actual detection | wedge | is 0.05%.
F. And (3) post-treatment: and slowly cooling the coil qualified in product quality judgment to room temperature, then performing a cold rolling process for subsequent processing, and the structural schematic diagram after rolling is shown in figures 1 and 2.
Example 2
A rolling production process of an ultrathin aluminum alloy strip comprises the following steps:
A. selecting materials: according to the characteristics of the aluminum alloy material and the order condition, the 6061 aluminum magnesium alloy for preparing the ultrathin aluminum alloy strip is selected, and the components are proportioned according to the weight percentage.
B. Heating: adding the prepared aluminum alloy raw material into a smelting furnace, uniformly mixing, smelting into liquid aluminum alloy, performing standing, refining, slagging off, online degassing and filtering, casting the liquid aluminum alloy into an aluminum alloy ingot, performing no homogenization treatment on the cast aluminum alloy ingot, sawing and milling the aluminum alloy ingot, and heating in a heating furnace at the temperature of 500 ℃ for 3 hours.
C. Hot rough rolling: discharging the aluminum alloy ingot after heating and heat preservation for hot rolling, wherein the rolling pass is 13, when the thickness of the intermediate blank is 119mm, the head and tail crocodile mouths are cut off, then, the rolling is carried out repeatedly for 4 passes until the thickness is 25mm, the single-pass reduction is 15-40 mm, the rolling speed is 1.9-3.2 m/s, and the temperature of the intermediate blank is 400-460 ℃; in order to give consideration to the lubricating and cooling performances of a lubricating and cooling medium in the hot rough rolling process, the concentration of an emulsion in the hot rough rolling process is controlled to be 3.5-3.6%, the content of lubricating grease is controlled to be 21-22%, the content of non-combined acid is controlled to be 4.1-4.2%, the temperature of an emulsion system is controlled to be 56 ℃, and the pressure of the emulsion system is controlled to be 4.5 bar.
D. Hot finish rolling: reducing the plate blank rolled to the thickness of 25mm by a hot rough rolling mill to the thickness of 1.5 +/-0.03 mm by four racks through hot finish rolling one by one, coiling the plate blank into a coil, wherein the finish rolling temperature is 300-320 ℃, the processing rate distribution mode of F1-F4 racks is 50-52-49%, and the outlet tension among the F1-F4 racks and the F4 racks is set to be 9-11-14-19N/mm 2 (ii) a In order to give consideration to the lubricating and cooling performances of a lubricating and cooling medium in the hot finish rolling process, the concentration of a finish rolling emulsion is controlled to be 7.0-7.1%, the content of lubricating grease is controlled to be 30.5-31.5%, the content of non-bound acid is controlled to be 10.5-11.5%, the temperature of an emulsion system is controlled to be 56 ℃, and the pressure of the emulsion system is controlled to be 4.5 bar.
E. Uncoiling inspection: uncoiling the coiled material after coiling, and checking that the actual detection thickness is 1.503mm, the actual detection width is 1044mm, the actual detection convexity is 0.21%, and the actual detection | wedge | is 0.29%.
F. And (3) post-treatment: and slowly cooling the coil qualified in product quality judgment to room temperature, and then performing subsequent processing by transferring a cold rolling process.
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.
Claims (7)
1. A rolling production process of an ultrathin aluminum alloy strip is characterized by comprising the following steps:
A. selecting materials: comprehensively considering the characteristics and equipment capability of each series of aluminum alloy materials, selecting an aluminum alloy series for preparing the ultrathin aluminum alloy strip, and batching the components according to weight percentage;
B. heating: adding the prepared aluminum alloy raw materials into a smelting furnace, uniformly mixing, smelting to obtain liquid aluminum alloy, performing standing, refining, slagging off, online degassing and filtering, casting the liquid aluminum alloy into aluminum alloy ingots, performing saw cutting and surface milling on the aluminum alloy ingots, and heating in a heating furnace at the temperature of 480-520 ℃ for 2-3 h;
C. hot rough rolling: discharging the aluminum alloy ingot after heating and heat preservation for hot rolling, wherein the rolling pass is 13, when the thickness of the intermediate blank is 110-120 mm, the head and tail crocodile mouths are cut off, then, 4-pass rolling is continuously and repeatedly carried out, the thickness of the intermediate blank is 24-25 mm, the single-pass rolling reduction is 15-40 mm, the rolling speed is 1.9-3.2 m/s, and the temperature of the intermediate blank is 400-460 ℃;
D. hot finish rolling: the method comprises the steps of thinning a plate blank rolled to the thickness of 24-25 mm by a hot rough rolling mill to the thickness of 1.5 +/-0.03 mm one by one through four racks for hot finish rolling to be coiled, wherein the final rolling temperature is 300-320 ℃, the processing rate distribution mode of F1-F4 racks adopts (49 +/-1)% - (51 +/-1)% - (50 +/-1)%, and the outlet tension among F1-F4 racks and the outlet tension of the F4 rack are set to be 9-11-14-19N/mm 2 ；
E. Uncoiling inspection: uncoiling the coiled material after coiling, checking the product size according to the product size and surface quality requirements, and performing product size detection and alkali washing treatment, wherein the thickness tolerance of the aluminum alloy coiled material is +/-0.03 mm, the width tolerance is 0-5 mm, the convexity is 0-0.6%, and the | wedge | is less than or equal to 0.35%;
F. and (3) post-treatment: and slowly cooling the coil qualified in product quality judgment to room temperature, and then performing subsequent processing by transferring a cold rolling process.
2. The process for roll production of an ultra-thin aluminum alloy strip of claim 1, wherein the aluminum alloy series for the ultra-thin aluminum alloy strip in step a is 1xxx, 3xxx, 6xxx or 8xxx series.
3. The rolling production process of the ultrathin aluminum alloy strip as claimed in claim 1, wherein the aluminum alloy ingot cast in the step B is subjected to homogenization treatment in a homogenizing furnace, the homogenization treatment temperature is 550-600 ℃, and the heat preservation time is 8-12 hours.
4. The process for rolling the ultra-thin aluminum alloy strip as claimed in claim 1, wherein the first 13 passes of the hot rough rolling in the step C are performed with a small reduction in the first and last passes and a large reduction in the middle pass.
5. The rolling production process of the ultrathin aluminum alloy strip as claimed in claim 1, wherein in the step C, the concentration of the emulsion in the hot rough rolling is controlled to be 3.5-3.6%, the content of the lubricating grease is controlled to be 21-22%, the content of the non-combined acid is controlled to be 4.1-4.2%, the temperature of an emulsion system is controlled to be 56 ℃, and the pressure of the emulsion system is controlled to be 4.5 bar.
6. The process for rolling production of ultra-thin aluminum alloy strip according to claim 5, wherein the F1-F4 frame spray beam cooling mode in the step D finish hot rolling employs an inlet cooling spray beam + an outlet cooling spray beam.
7. The rolling production process of the ultrathin aluminum alloy strip as claimed in claim 6, wherein in the step D, the concentration of the finish rolling emulsion is controlled to be 7.0-7.1%, the content of the lubricating grease is controlled to be 30.5-31.5%, the content of the non-bound acid is controlled to be 10.5-11.5%, the temperature of an emulsion system is controlled to be 56 ℃, and the pressure of the emulsion system is controlled to be 4.5 bar.
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