CN113263151B - Equipment and process for producing aluminum alloy with deep drawing performance by cast-rolling method - Google Patents
Equipment and process for producing aluminum alloy with deep drawing performance by cast-rolling method Download PDFInfo
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- CN113263151B CN113263151B CN202110617800.8A CN202110617800A CN113263151B CN 113263151 B CN113263151 B CN 113263151B CN 202110617800 A CN202110617800 A CN 202110617800A CN 113263151 B CN113263151 B CN 113263151B
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- 238000005097 cold rolling Methods 0.000 claims description 7
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- QDMRQDKMCNPQQH-UHFFFAOYSA-N boranylidynetitanium Chemical compound [B].[Ti] QDMRQDKMCNPQQH-UHFFFAOYSA-N 0.000 claims description 6
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
- B22D11/0622—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars formed by two casting wheels
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/001—Continuous casting of metals, i.e. casting in indefinite lengths of specific alloys
- B22D11/003—Aluminium alloys
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
- B22D11/0637—Accessories therefor
- B22D11/064—Accessories therefor for supplying molten metal
- B22D11/0645—Sealing means for the nozzle between the travelling surfaces
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
- B22D11/0637—Accessories therefor
- B22D11/068—Accessories therefor for cooling the cast product during its passage through the mould surfaces
- B22D11/0682—Accessories therefor for cooling the cast product during its passage through the mould surfaces by cooling the casting wheel
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
- B22D11/0637—Accessories therefor
- B22D11/0697—Accessories therefor for casting in a protected atmosphere
-
- 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
- C22C21/00—Alloys based on aluminium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Continuous Casting (AREA)
Abstract
The invention relates to a casting-rolling manufacturing technology of an aluminum alloy material, in particular to equipment and a process for producing an aluminum alloy with deep drawing performance by a casting-rolling method. In a cooling loop of a roller of the casting and rolling equipment, a liquid inlet and collecting pipe is arranged in the peripheral surface of the roller body to increase the contact area between cooling liquid and the peripheral surface of the roller body, a liquid isolating plate is arranged in a cooling ring groove to limit the unidirectional flow of the cooling liquid, four air knives are arranged around a casting nozzle of the casting and rolling equipment, and the air knives and the roller surround the casting nozzle in a relatively closed space to form an inert gas protection ring; in addition, the components of the aluminum alloy and the casting and rolling process are improved in a targeted manner. The invention starts from various aspects of alloy components, casting and rolling equipment and a production process, ensures that the liquid level of the aluminum alloy molten liquid is relatively stable in the casting and rolling process, avoids oxidation reaction, and directly contacts the aluminum alloy molten liquid with the roller sleeve with uniform temperature and rolls the aluminum alloy molten liquid into the aluminum alloy strip, thereby avoiding the appearance of tiger skin lines on the surface of the aluminum alloy strip and greatly improving the quality of the aluminum alloy strip.
Description
Technical Field
The invention relates to a casting-rolling manufacturing technology of an aluminum alloy material, in particular to equipment and a process for producing an aluminum alloy with deep drawing performance by a casting-rolling method.
Background
Casting and rolling, also known as ingot-free rolling, are combined forming methods of casting methods and rolling methods. Casting and rolling are processes for directly casting and rolling a metal melt into a semi-finished blank or a finished product. The said process features its crystallizer comprising two rotating casting rolls with water cooling system, and the melt between the casting rolls completes the solidification and hot rolling in short time. The continuous casting and rolling process for producing the aluminum alloy strip has the advantages of low investment, low cost, short flow and high production efficiency, and is widely used in China.
In the continuous casting and rolling production, the control of the casting and rolling equipment, alloy components and each process parameter of the vertical plate procedure is the key for determining the quality of the cast and rolled plate surface. In the current industrial production, the aluminium alloy strip produced by the cast-rolling method is very easy to have 'tiger skin lines', and the defect is difficult to eliminate. The 'tiger skin lines' are characterized in that the aluminum alloy strips produced by a casting and rolling method have wavy stripes with different degrees and alternately bright and dark on the 'tiger skin lines' defect part after being corroded by acid liquor, after the aluminum alloy strips are processed by cold rolling, the stripe intervals are increased, the grains at the bright and dark positions of the stripes are different in size, and thicker dendritic crystal structures and thicker compound particles are arranged below the corrugated lines of the aluminum alloy strips, so that the quality of the aluminum alloy strips is seriously influenced. Because the cause of the tiger skin lines is complex, the alloy components, casting and rolling equipment and the production process are continuously optimized in the current production.
Unbalanced crystallization during continuous casting of aluminum alloy is very easy to cause uneven distribution of chemical components in ingots, and the phenomenon is called grain segregation, so that the appearance of 'tiger skin lines' is aggravated. In particular, the grain-interior micro-hardness is different due to the intragranular segregation with uneven chemical components, the micro-hardness near the grain boundary is high, and the micro-hardness at the grain center is low. The existence of intragranular segregation causes the chemical composition inside the crystal grains and the cast-rolled structure to be extremely uneven, and the performance of the cast-rolled strip is seriously deteriorated. The main method for reducing the intragranular segregation at present comprises the steps of improving the cooling speed, refining grains and an intragranular structure by adopting modification treatment, and reducing the intragranular segregation range; or the cooling speed is reduced by adopting the reverse method, deep liquid cavity casting similar to ingot mold casting is carried out, so that the supersaturation degree of elements such as iron, manganese and the like is reduced, and the segregation degree is reduced; or selecting some additive capable of properly altering the crystallization properties of the alloy.
The most core equipment of the casting and rolling process mainly comprises a casting nozzle trolley and a roller, wherein the roller mainly comprises a roller body, a roller sleeve and the like. In the working process, the roller continuously rotates, so that the surface of the roller sleeve is subjected to periodic cycle alternating action of cold and hot loads, the roller sleeve forms an alternating temperature field, corresponding thermal stress is generated, and the peripheral surface of the roller sleeve is cracked. As the operating time increases, the fracture cracks on the peripheral surface of the sleeve gradually increase and enlarge. Aluminum is a nonferrous metal with more active property, and is easy to generate chemical reaction with oxygen in the air to generate an oxide film in a natural environment, and the oxidation reaction is more rapid particularly in a high-temperature environment. Due to the inherent characteristics of the twin roll casting process, the molten liquid of the aluminum alloy in the gap between the nozzle and the roll is exposed to air, and thus oxidation reaction occurs and an oxide film is formed. The oxide film is a hard and brittle impurity, particularly an oxide film which is not naturally formed in the casting and rolling process and has intermittent, random and continuous characteristics. With the rotation of the roller with the uneven temperature and cracks on the surface, the oxide film is more easily brought to the surface of the metal strip by the roller sleeve and remains on the surface of the metal strip, which causes adverse effects on the production process of the metal strip and the surface quality of products, thereby forming holes on the surface of the strip or causing strip breakage, and further reducing the surface quality of the aluminum alloy strip.
Prior art ZL201310060633.7, name: a method for eliminating tiger stripes on the surface of a cast-rolled plate. After a mixed coating layer consisting of graphite particles and oxides is uniformly formed on the surface of a casting roller, a stable coating is formed by mixing aluminum oxide and graphite particles through firstly producing 1-series and 8-series alloy on the surface of the casting roller, so that the tiger skin lines on the surface of an aluminum cast-rolling plate are eliminated. However, the process of the invention is complex, and the production of the 1-series and 8-series alloy is time-consuming, so that the production cost is obviously increased.
Disclosure of Invention
The invention aims to provide equipment and a process for eliminating tiger stripes on the surface of aluminum alloy with deep drawability produced by a cast-rolling method.
In a first aspect of the invention, the invention provides a casting and rolling device for producing aluminum alloy with deep drawing performance by a casting and rolling method, the casting and rolling device comprises a roller body and a roller sleeve arranged on the periphery of the roller body, the roller body is provided with a cooling loop, the cooling loop comprises at least one liquid inlet channel and at least one liquid outlet channel, and the peripheral surface of the roller body is provided with a cooling ring groove;
the casting nozzle trolley comprises a casting nozzle trolley plate, a casting nozzle pressing plate, lugs and a casting nozzle stop block, wherein the casting nozzle is fixed between the casting nozzle trolley plate and the casting nozzle pressing plate, and the lugs and the casting nozzle stop block are sequentially arranged outwards on two sides of the casting nozzle and between the casting nozzle pressing plate and the casting nozzle trolley;
set up the feed liquor collector tube in the peripheral surface of roll body, the feed liquor collector tube is seted up the feed liquor collector tube export with cooling ring groove intercommunication department, be linked together by at least one feed liquor branch passageway between feed liquor passageway and feed liquor collector tube, collect the passageway by the play liquid between cooling ring groove and the play liquid passageway and be linked together, it collects the passageway entry with cooling ring groove intercommunication department and sets up out liquid, feed liquor collector tube export collects the passageway entry with play liquid and gathers the passageway entry and adjacent arranging in pairs and along the peripheral direction of roll body in turn, set up the liquid trap in the cooling ring groove, the liquid trap separates adjacent paired feed liquor collector tube export and play liquid and collect the passageway entry, the liquid trap separates the cooling ring groove for a plurality of sections that are not linked together,
the casting nozzle is characterized in that a first air knife is arranged above the casting nozzle pressing plate, a second air knife is arranged below the casting nozzle trolley, a third air knife and a fourth air knife are respectively arranged on the outer side of the casting nozzle stop block, the air outlet of each air knife faces towards the roller, and the four air knives and the roller surround the casting nozzle in a relatively closed space.
Specifically, the first air knife and the second air knife are arc-shaped curved surfaces.
Specifically, the axial lead of the liquid inlet collecting pipe is parallel to the axial lead of the roller, and the liquid inlet collecting pipe is discontinuous in a plurality of sections.
Concretely, inlet channel and liquid outlet channel are the blind hole shape, and the opening is in roll body one end, to extending with roll body axial lead direction parallel, inlet channel is 1, and liquid outlet channel is 4, and inlet channel sets up along the roll body axial lead, liquid outlet channel lays in the inlet channel periphery.
Specifically, the liquid inlet channels and the liquid outlet channels are equal in number and are alternately arranged along the axial line of the roller at intervals.
Specifically, the circle center of the cooling ring groove coincides with the circle center of the cross section of the roller, and the axial lead of the liquid outlet collecting channel is perpendicularly intersected with the tangent of the cooling ring groove at the inlet of the liquid outlet collecting channel.
In another aspect of the invention, the invention provides a casting and rolling process of an aluminum alloy strip by using the equipment, wherein the aluminum alloy comprises the following components in percentage by mass: 0.320-0.34% of Si, 0.600-0.700% of Fe, 0.150-0.180% of Cu, 1.300-1.500% of Mn, 0.038-0.050% of Ti, and the balance of aluminum and aluminum; the casting and rolling process comprises the following steps:
the method comprises the following steps: smelting, namely adding the industrial pure aluminum ingot prepared according to the proportion into a smelting furnace for conventional smelting treatment. After the aluminum ingot is melted, adding the aluminum-iron, aluminum-silicon, aluminum-copper, aluminum-manganese and aluminum-zinc intermediate alloy ingot when the temperature of the aluminum melting solution reaches 720-760 ℃, and refining, deslagging and stirring, wherein nitrogen is used during refining. Turning down the furnace when the temperature of the aluminum alloy molten solution reaches 740 and 760 ℃;
step two: keeping the temperature and standing, pouring the aluminum alloy molten solution in the smelting furnace into a heat preservation furnace, simultaneously adding a titanium boron refiner with the titanium content of 30 percent, controlling the mass percent of titanium in the aluminum alloy solution to be 0.020-0.030 percent, and keeping the temperature and standing, wherein the heat preservation standing treatment comprises the operations of keeping the temperature and standing, refining and slagging off, and the temperature of the aluminum alloy molten solution is up to 725-750 ℃;
step three: and (3) performing on-line treatment, namely degassing and filtering the aluminum liquid after heat preservation and standing by using on-line treatment equipment such as a degassing box, a filter box and the like. Feeding Al-Ti-B wires into the aluminum liquid at the inlet of the degassing box, wherein the content of titanium is 5.1-5.2%, the feeding speed is 120-150mm/min, and the mass percent of titanium in the aluminum liquid is controlled to be 0.038-0.050%.
Step four: casting and rolling, wherein the temperature of the aluminum alloy molten solution in the front box of the casting and rolling device is controlled to be 698 plus 705 ℃, the diameter of a casting and rolling roller is 960mm, the rolling force of casting and rolling is 1200 tons, the length of a casting and rolling area is 60-70mm, the casting and rolling speed is controlled to be 700 plus 900mm/min, the thickness of a cast and rolled strip is 10-11mm, the width of the cast and rolled strip is 180mm, the temperature of the cooling liquid in the roller is controlled to be 28-35 ℃, and the pressure is controlled to be 0.4 MPa;
step five: annealing, wherein the aluminum alloy strip billet which is cast and rolled at the temperature of about 200 ℃ is directly annealed, and the annealing process comprises the following steps: the furnace gas temperature is 600 ℃, and the temperature of the aluminum alloy strip is kept for 2 hours when reaching 590 ℃. Annealing and cooling, when the alloy temperature is below 50 ℃, performing cold rolling and rolling processing, and rolling the finished product to 5.00mm in thickness into coils;
specifically, the temperature of the aluminum alloy molten solution is preferably 750 ℃, the furnace is turned over, and the temperature of the aluminum alloy molten solution subjected to standing heat preservation is preferably 730 ℃.
Specifically, the titanium boron refiner is added in the casting and rolling process, the mass percent of titanium in the aluminum alloy solution is controlled to be 0.022%, aluminum titanium boron wires are fed into the aluminum liquid at the inlet of the degassing box, and the feeding speed is 128 mm/min.
Specifically, the temperature of the aluminum alloy molten solution in the front box of the casting and rolling device is controlled at 700 ℃, the length of a casting and rolling area is 65mm, the casting and rolling speed is controlled at 850mm/min, the temperature of the cooling liquid in a roller is controlled at 30 ℃, and the pressure is controlled at 0.4 MPa.
In conclusion, the invention has the following advantages: the invention starts from the aspects of aluminum alloy components, casting and rolling equipment and production process, ensures that the liquid level of the aluminum alloy molten liquid is relatively stable in the casting and rolling process, avoids oxidation reaction, and directly contacts with the roller sleeve with uniform temperature and rolls the aluminum alloy molten liquid into the aluminum alloy strip, thereby avoiding the appearance of tiger skin lines on the surface of the aluminum alloy strip and greatly improving the quality of the aluminum alloy strip.
Drawings
FIG. 1 is a schematic view of the construction of a casting and rolling plant according to the invention.
FIG. 2 is a schematic view of the nozzle trolley of the present invention.
Fig. 3 is a schematic view of the structure of the roller of the present invention.
FIG. 4 is a schematic cross-sectional view of the roll of the present invention.
FIG. 5 is a schematic longitudinal sectional view of the roll of the present invention.
FIG. 6 is a schematic cross-sectional view of another roll of the present invention.
Description of the figure numbers: 1. a twin roll casting apparatus; 2. a casting nozzle trolley; 21. a cast nozzle dolly plate; 22. casting a nozzle; 23. a casting nozzle pressing plate; 24. an ear; 25. a casting nozzle stop block; 26. a first air knife; 27. a second air knife; 28. a third air knife; 29. a fourth air knife; 3. rolling; 31. a roller body; 311. a liquid barrier; 32. a roller sleeve; 33. cooling back; 331. a liquid inlet channel; 332. a liquid outlet channel; 333. cooling the ring groove; 334. a liquid inlet branch channel; 335. a liquid outlet collecting channel; 4. an air tap.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", and the like, indicate orientations and positional relationships based on the orientations and positional relationships shown in the drawings, and are used merely for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.
In the description of the present invention, it is to be understood that the terms "first", "second" and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more, for example, two, three, etc., unless specifically defined otherwise.
In the present invention, unless otherwise expressly specified or limited, the terms "connected," "communicating," and the like are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally formed; can be mechanical connection and electrical connection; may be directly connected, or indirectly connected through an intermediate; there may be communication within two elements or an interaction of two elements unless otherwise expressly limited. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, a first feature "above", "below" or "on" a second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," or "on" a second feature may be directly on or obliquely above the second feature, or simply mean that the first feature is at a higher level than the second feature. A first feature may be "under," "beneath," or "beneath" a second feature, and the first and second features may be in direct contact, or the first and second features may be in indirect contact via an intermediate. Also, a first feature "under," "beneath," or "beneath" a second feature may be directly under or obliquely below the second feature, or simply mean that the first feature is at a lesser level than the second feature.
In the description herein, it is understood that the description of the terms "one embodiment" or "a particular embodiment," etc., is intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
The invention provides a production line for producing 3-series aluminum alloy wafers by a casting and rolling method, which is described in detail below and sequentially comprises a melting furnace, a heat preservation furnace, a degassing tank, a filter tank, casting and rolling equipment, a strip annealing furnace, cold rolling equipment, a punch press and a finished product annealing furnace. The casting and rolling equipment comprises a casting nozzle trolley and a roller, a liquid collecting pool for cooling liquid to be intensively recycled is connected to the outside of the roller and is used for precipitating, a cooling tower is connected to the outside of the liquid collecting pool, and a liquid storage pool is arranged between the cooling tower and the double-roller casting and rolling equipment. Meanwhile, the liquid collecting tank, the cooling tower and the liquid storage tank are connected through auxiliary pipelines respectively, and a control valve is arranged at the port of each section of the auxiliary pipeline.
As shown in fig. 1, the casting and rolling equipment 1 comprises two oppositely arranged rolls 3, and a gap with a certain distance exists between the two rolls, and the gap is the same as the thickness of the aluminum alloy strip cast and rolled. The casting and rolling equipment also comprises a casting nozzle trolley 2 arranged on one side of the two rollers.
As shown in fig. 1-2, the nozzle trolley includes a nozzle trolley plate 21, a nozzle 22, a nozzle pressing plate 23, lugs 24 and nozzle stoppers 25, the nozzle is fixed on the nozzle trolley plate, the nozzle pressing plate presses the nozzle thereunder, the lugs and the nozzle stoppers are arranged on two side edges of the nozzle in sequence, and the nozzle and the lugs are located between the nozzle pressing plate and the nozzle trolley and extend into a gap between two rollers. A first air knife 26 is arranged above the pressure plate close to the casting nozzle, a second air knife 27 is arranged below the trolley close to the casting nozzle, a third air knife 28 and a fourth air knife 29 are respectively arranged outside the stop block close to the casting nozzle, the air knife edges of the first air knife, the second air knife, the third air knife and the fourth air knife are flat, the openings of the first air knife, the second air knife, the third air knife and the fourth air knife face the rollers, and the four air knives and the rollers surround the casting nozzle in a relatively closed space. The tail part of the air knife is provided with an air tap 4, the air tap is connected with an external inert gas source through a pipeline, and a control device for controlling the gas flow is arranged on the pipeline.
As shown in fig. 3-5, the roll comprises a roll body 31 and a roll cover 32 arranged around the roll body, and the roll body is further provided with a cooling circuit 33. The cooling circuit comprises at least one inlet channel 331 and at least one outlet channel 332. The liquid inlet channel and the liquid outlet channel are preferably in blind hole shapes, are opened at one end of the roller body and extend in parallel to the axial lead direction of the roller body. The liquid inlet channel is connected with an external cooling liquid supply pipeline, and the liquid outlet channel is connected with an external cooling liquid discharge pipeline. The peripheral surface of the roller body is also provided with a plurality of cooling ring grooves 333, and the axial line formed by the plurality of cooling ring grooves is preferably coincident with the axial line of the roller body. A liquid inlet and collection pipe 336 is further arranged in the peripheral surface of the roller body, a liquid inlet and collection pipe outlet 3361 is formed at the communication position of the liquid inlet and collection pipe and the cooling ring groove, and the liquid inlet channel is communicated with the liquid inlet and collection pipe through at least one liquid inlet branch channel 334. The cooling ring groove is communicated with the liquid outlet channel through a liquid outlet collecting channel 335, and a liquid outlet collecting channel inlet 3351 is formed at the communication position of the liquid outlet collecting channel and the cooling ring groove. The outlets of the liquid inlet and collecting pipes and the inlets of the liquid outlet collecting channels are adjacently arranged in pairs and are alternately arranged along the peripheral direction of the roller body, a liquid isolating plate 311 is arranged in the cooling ring groove, the liquid isolating plate separates the outlets of the liquid inlet and collecting pipes and the inlets of the liquid outlet collecting channels which are adjacently arranged in pairs, and the liquid isolating plate divides the cooling ring groove into a plurality of sections which are not communicated.
The detailed working process of the casting and rolling equipment is described as follows: and opening the inert gas source control device 15 minutes before production to enable the inert gas to supply gas to the air knife at a certain flow rate, and the air knife sprays the inert gas to the casting roll direction, so that the inert gas protective ring is formed. The two rolls are then turned on, the directions of rotation being opposite to each other. The cooling liquid establishes closed circulation system, and the cooling liquid pours into the roll body into through the inlet channel into, is shunted to the feed liquor branch passageway after, rethread feed liquor branch passageway to feed liquor collector pipe, exports to the cooling ring groove through the feed liquor collector pipe after. Due to the separation of the liquid separation plate, the cooling liquid can only flow in a clockwise or anticlockwise one-way order, the cooling liquid flows through the cooling ring groove to take away the heat of the roller sleeve, and the cooling liquid is converged to the liquid outlet converging channel through the inlet of the nearest liquid outlet converging channel and then is discharged out of the roller through the liquid outlet channel and the cooling liquid discharge pipeline in sequence. The cooling liquid discharged from the casting and rolling equipment is intensively recovered, the recovered liquid enters a liquid collecting tank for precipitation, the precipitated cooling liquid enters a cooling tower for cooling and then enters a liquid storage tank, and the cooled cooling liquid enters a roller for recycling, and the steps are repeated.
Because the four flat-mouth-shaped air knives directly blow the roller body, an inert gas protection ring is further formed, and the relative stability of the liquid level of the aluminum alloy molten liquid is ensured. Further feed liquor collector pipe is laid in the peripheral surface of roll body, and the coolant liquid wherein can the peripheral surface heat of preliminary absorption roll body, again because of the setting of liquid partition plate, feed liquor collector pipe flow to the coolant liquid of cooling annular only can follow the directional orderly flow of cooling annular folk prescription, can take away the heat of roller shell by the efficient more to better keep the roller shell in a invariable and lower temperature. When the aluminum alloy molten liquid is injected into one side of the gap between the two roller bodies through the casting nozzle, the inert gas ring ensures that the liquid level of the aluminum alloy molten liquid is relatively stable and is not easy to generate oxidation reaction, and the roller sleeve with uniform temperature is in direct contact with the aluminum alloy molten liquid and rolls the aluminum alloy molten liquid into an aluminum alloy strip, so that the appearance of tiger stripes on the surface of the aluminum alloy strip is avoided, and the quality of the aluminum alloy strip is greatly improved.
According to an embodiment of the invention, as shown in fig. 3, the cooling circuit comprises 1 inlet channel and 4 outlet channels 332, which are blind holes and open at one end of the roll body and extend parallel to the axial center line of the roll body. The peripheral surface of the roller body is also provided with a plurality of cooling ring grooves, and the axial lead formed by the plurality of cooling ring grooves is superposed with the axial lead of the roller body. And 4 liquid inlet and collecting pipes are further arranged in the peripheral surface of the roller body, the liquid inlet and collecting pipe is communicated with the cooling ring groove and provided with a liquid inlet and collecting pipe outlet, and the liquid inlet channel is communicated with the liquid inlet and collecting pipe through a liquid inlet branch channel. The cooling ring groove is communicated with the liquid outlet channel through a liquid outlet collecting channel, and an inlet of the liquid outlet collecting channel is formed at the communication position of the liquid outlet collecting channel and the cooling ring groove. The outlets of the liquid inlet and collecting pipes and the inlets of the liquid outlet collecting channels are adjacently arranged in pairs and are alternately arranged along the peripheral direction of the roller body, liquid isolating plates are arranged in the cooling ring grooves, the liquid isolating plates separate the outlets of the liquid inlet and collecting pipes and the inlets of the liquid outlet collecting channels which are adjacently arranged in pairs, and the liquid isolating plates separate the cooling ring grooves into a plurality of sections which are not communicated.
According to an embodiment of the invention, as shown in fig. 2, the cooling ring grooves are circular ring-shaped cooling ring grooves, which are independent from each other, and the center of the cooling ring groove coincides with the center of the cross section of the roll.
According to an embodiment of the present invention, as shown in fig. 4, the axial line of the liquid inlet collecting pipe is parallel to the axial line of the roller, and the liquid inlet collecting pipe is in discontinuous segments.
According to an embodiment of the invention, as shown in fig. 6, the number of the liquid inlet channels and the number of the liquid outlet channels are equal, and the liquid inlet channels and the liquid outlet channels are arranged at intervals in pairs around the axial line of the roller.
According to one embodiment of the invention, as shown in fig. 6, the cooling circuit is preferably 3 inlet channels and 3 outlet channels, and the 3 inlet channels and the 3 outlet channels are arranged at intervals in pairs around the axis of the roll.
According to an embodiment of the invention, as shown in fig. 6, the long axis of the liquid collecting channel is perpendicular to the tangent of the cooling ring groove at the inlet of the liquid collecting channel.
According to an embodiment of the invention, the liquid inlet branch channels along the axial direction of the roller are parallel to each other, and the liquid outlet collecting channels along the axial direction of the roller are parallel to each other.
In another aspect of the invention, the aluminum alloy comprises the following components in percentage by mass: 0.320-0.350% of Si, 0.600-0.700% of Fe, 0.140-0.180% of Cu, 1.300-1.500% of Mn, 0.038-0.050% of Ti and the balance of aluminum and aluminum, wherein the impurity elements meet the requirements of GB/T3190-2008 on the 3-series aluminum alloy, and generally the content of a single impurity element is less than or equal to 0.05%, and the total content of the impurity elements is less than or equal to 0.15%.
In one embodiment of the invention, the aluminum alloy comprises the following components in percentage by mass: 0.320% of Si, 0.600% of Fe, 0.150% of Cu, 1.350% of Mn, 0.038% of Ti and the balance of aluminum and aluminum.
In one embodiment of the invention, the aluminum alloy comprises the following components in percentage by mass: 0.320% of Si, 0.680% of Fe, 0.150% of Cu, 1.450% of Mn, 0.046% of Ti, and the balance of aluminum and aluminum.
In one embodiment of the invention, the aluminum alloy comprises the following components in percentage by mass: 0.340% of Si, 0.610% of Fe, 0.160% of Cu, 1.500% of Mn, 0.049% of Ti, and the balance of aluminum and aluminum.
The invention also provides a process for producing the 3-series aluminum alloy by a casting and rolling method, which comprises the following steps in detail:
the method comprises the following steps: smelting, namely adding the industrial pure aluminum ingot prepared according to the proportion into a smelting furnace for conventional smelting treatment. After the aluminum ingot is melted, adding the intermediate alloy ingot of aluminum iron, aluminum silicon, aluminum copper, aluminum manganese and aluminum zinc when the temperature of the aluminum melting solution reaches 720-760 ℃, preferably 730 ℃, and carrying out refining, deslagging and stirring operations, wherein nitrogen is used during refining. And (4) turning down the furnace when the temperature of the aluminum alloy molten solution reaches 740-760 ℃, preferably 750 ℃.
Step two: and (2) preserving heat and standing, pouring the aluminum alloy molten solution in the smelting furnace into a heat preserving furnace, adding a titanium boron refiner with the titanium content of 30 percent at the same time, controlling the mass percent of titanium in the aluminum alloy solution to be 0.020-0.030 percent, preserving heat and standing, including preserving heat and standing, refining and slagging-off operations, wherein the temperature of the aluminum alloy molten solution is up to 725-750 ℃, and is preferably 730 ℃.
Step three: and (3) performing on-line treatment, namely degassing and filtering the aluminum liquid after heat preservation and standing by using on-line treatment equipment such as a degassing box, a filter box and the like. Feeding Al-Ti-B wires into the aluminum liquid at the inlet of the degassing box, wherein the content of titanium is 5.1-5.2%, the feeding speed is 120-150mm/min, and the mass percent of titanium in the aluminum liquid is controlled to be 0.038-0.050%.
Step four: casting and rolling, wherein the temperature of the aluminum alloy molten solution in the front box of the casting and rolling device is controlled at 698 minus 705 ℃, preferably 700 ℃, the diameter of the casting and rolling roll is 960mm, the casting and rolling force is 1200 tons, the length of the casting and rolling area is 60-70mm, the casting and rolling speed is controlled at 700 plus 900mm/min, the thickness of the casting and rolling strip is 10-11mm, the width of the casting and rolling strip is 180mm, the temperature of the cooling liquid in the roll is controlled at 28-35 ℃, preferably 30 ℃, and the pressure is controlled at 0.4 MPa.
Step five: annealing, wherein the aluminum alloy strip billet which is cast and rolled at the temperature of about 200 ℃ is directly annealed, and the annealing process comprises the following steps: keeping the temperature for 2 hours when the furnace gas temperature is 600 ℃ and the temperature of the aluminum alloy strip is up to 590 ℃. Annealing and cooling, when the alloy temperature is below 50 ℃, performing cold rolling and rolling processing, rolling the finished product to the thickness of 5.00mm, coiling, and crushing large crystal grains through cold rolling.
Step six: cutting the aluminum alloy strip into aluminum alloy wafers by using a punch according to polar coordinates, and annealing the finished product in an annealing furnace, wherein the annealing process of the finished product is as follows: keeping the temperature of the furnace gas at 410 ℃ and the aluminum alloy strip at 400 ℃ for 2 hours, taking out the aluminum alloy strip, and cooling to normal temperature. And in the annealing process, the grains crushed by cold rolling are recombined and refined. The aluminum alloy wafers are packaged for use in making containers, battery cases, and the like.
The mechanical property of the aluminum alloy material produced by the equipment, the formula and the process meets the requirement of GB/T3880.2-2012, and the Vickers hardness tester is between 28 and 30.
In one embodiment of the invention, the aluminum alloy molten solution is poured when the temperature of the aluminum alloy molten solution is 750 ℃ preferably, and the aluminum alloy molten solution after standing and heat preservation is 730 ℃ preferably. And a titanium boron refiner is added in the casting and rolling process, the mass percent of titanium in the aluminum alloy solution is controlled to be 0.022%, and aluminum-titanium-boron wires are fed into the aluminum liquid at an inlet of a degassing box at a feeding speed of 128 mm/min. The temperature of the aluminum alloy molten solution in the front box of the casting and rolling device is controlled at 700 ℃, the casting and rolling force is 1200 tons, the length of a casting and rolling area is 65mm, the casting and rolling speed is controlled at 850mm/min, the temperature of the cooling liquid in the roller is controlled at 30 ℃, and the pressure is controlled at 0.4 MPa.
While embodiments of the present invention have been shown and described above, it should be understood that the above embodiments are exemplary and should not be taken as limiting the invention. Various changes and modifications may be made to the invention without departing from the spirit and scope of the invention, and such changes and modifications are intended to be within the scope of the invention as claimed.
Claims (10)
1. A casting and rolling device for producing aluminum alloy with deep drawing performance by a casting and rolling method comprises two rollers which are oppositely arranged, and a casting nozzle trolley is arranged on one side of each roller;
the roller comprises a roller body and a roller sleeve arranged on the periphery of the roller body, the roller body is provided with a cooling loop, the cooling loop comprises at least one liquid inlet channel and at least one liquid outlet channel, and the peripheral surface of the roller body is provided with a cooling ring groove;
the casting nozzle trolley comprises a casting nozzle trolley plate, a casting nozzle pressing plate, lugs and a casting nozzle stop block, wherein the casting nozzle is fixed between the casting nozzle trolley plate and the casting nozzle pressing plate, and the lugs and the casting nozzle stop block are arranged outwards on two sides of the casting nozzle and between the casting nozzle pressing plate and the casting nozzle trolley in sequence;
it is characterized in that the preparation method is characterized in that,
set up the feed liquor collector tube in the peripheral surface of roll body, the feed liquor collector tube is seted up the feed liquor collector tube export with cooling ring groove intercommunication department, be linked together by at least one feed liquor branch passageway between feed liquor passageway and feed liquor collector tube, collect the passageway by the play liquid between cooling ring groove and the play liquid passageway and be linked together, it collects the passageway entry with cooling ring groove intercommunication department and sets up out liquid, feed liquor collector tube export collects the passageway entry with play liquid and gathers the passageway entry and adjacent arranging in pairs and along the peripheral direction of roll body in turn, set up the liquid trap in the cooling ring groove, the liquid trap separates adjacent paired feed liquor collector tube export and play liquid and collect the passageway entry, the liquid trap separates the cooling ring groove for a plurality of sections that are not linked together,
the casting nozzle is characterized in that a first air knife is arranged above the casting nozzle pressing plate, a second air knife is arranged below the casting nozzle trolley, a third air knife and a fourth air knife are respectively arranged on the outer side of the casting nozzle stop block, the air outlet of each air knife faces towards the roller, and the four air knives and the roller surround the casting nozzle in a relatively closed space.
2. The cast-rolling equipment for producing the aluminum alloy with the deep drawing performance by the cast-rolling method according to claim 1, wherein the first air knife and the second air knife are arc-shaped curved surfaces.
3. A cast-rolling device for producing aluminum alloy with deep drawing performance according to claim 1, wherein the axial lead of the liquid inlet collecting pipe is parallel to the axial lead of the roller, and the liquid inlet collecting pipe is discontinuous in a plurality of sections.
4. The cast-rolling equipment for producing aluminum alloy with deep drawing property by the cast-rolling method according to claim 1, wherein the liquid inlet channel and the liquid outlet channel are blind holes, the openings of the blind holes are positioned at one end of the roller body and extend in parallel with the axial lead of the roller body, the number of the liquid inlet channels is 1, the number of the liquid outlet channels is 4, the liquid inlet channels are arranged along the axial lead of the roller body, and the liquid outlet channels are arranged at the periphery of the liquid inlet channels.
5. The cast-rolling equipment for producing aluminum alloy with deep drawing performance by the cast-rolling method according to claim 1, wherein the liquid inlet channels and the liquid outlet channels are equal in number and are alternately arranged along the axial line of the roller at intervals.
6. The cast-rolling equipment for producing aluminum alloy with deep drawability according to claim 5, wherein the center of the cooling ring groove coincides with the center of the cross section of the roller, and the axial line of the liquid outlet collecting channel is perpendicular to the tangent line of the cooling ring groove at the inlet of the liquid outlet collecting channel.
7. A casting and rolling process of an aluminum alloy strip using the apparatus of claim 1, characterized in that the aluminum alloy comprises the following components by mass percent: 0.320-0.34% of Si, 0.600-0.700% of Fe, 0.150-0.180% of Cu, 1.300-1.500% of Mn, 0.038-0.050% of Ti, and the balance of aluminum and aluminum; the casting and rolling process comprises the following steps:
the method comprises the following steps: smelting, namely adding the industrial pure aluminum ingots prepared according to the proportion into a smelting furnace for conventional smelting treatment, adding aluminum-iron, aluminum-silicon, aluminum-copper, aluminum-manganese and aluminum-zinc intermediate alloy ingots when the temperature of the aluminum molten solution reaches 720-760 ℃ after the aluminum ingots are molten, and turning down the furnace when the temperature of the aluminum molten solution reaches 740-760 ℃;
step two: keeping the temperature and standing, pouring the aluminum alloy molten solution into a heat preservation furnace, simultaneously adding a titanium boron refiner with the titanium content of 30 percent, controlling the mass percent of titanium in the aluminum alloy solution to be 0.020-0.030 percent, and keeping the temperature and standing, wherein the temperature of the aluminum alloy molten solution is 750 ℃;
step three: performing on-line treatment, namely degassing and filtering the aluminum liquid after heat preservation and standing by using on-line treatment equipment comprising a degassing box and a filter box, feeding aluminum titanium boron wires into the aluminum liquid at the inlet of the degassing box, wherein the titanium content is 5.1-5.2%, the feeding speed is 120-150mm/min, and the mass percent of titanium in the aluminum liquid is controlled to be 0.038-0.050%;
step four: casting and rolling, wherein the temperature of the aluminum alloy molten solution in the front box of the casting and rolling device is controlled to be 698 plus 705 ℃, the diameter of a casting and rolling roller is 960mm, the rolling force of casting and rolling is 1200 tons, the length of a casting and rolling area is 60-70mm, the casting and rolling speed is controlled to be 700 plus 900mm/min, the thickness of a cast and rolled strip is 10-11mm, the width of the cast and rolled strip is 180mm, the temperature of the cooling liquid in the roller is controlled to be 28-35 ℃, and the pressure is controlled to be 0.4 MPa;
step five: annealing, wherein the aluminum alloy strip billet which is cast and rolled at 200 ℃ is directly annealed, and the annealing process comprises the following steps: keeping the temperature of the furnace gas at 600 ℃ and the temperature of the aluminum alloy strip at 590 ℃ for 2 hours, annealing and cooling, carrying out cold rolling and rolling processing when the alloy temperature is below 50 ℃, and rolling the rolled product to 5.00mm in thickness into coils.
8. A cast rolling process of the aluminum alloy strip as recited in claim 7, wherein the temperature of the aluminum alloy molten solution is 750 ℃ and the temperature of the aluminum alloy molten solution after standing and holding is 730 ℃.
9. A cast-rolling process of an aluminum alloy strip as claimed in claim 7, wherein the titanium boron refiner is added in the cast-rolling process, the mass percentage of titanium in the aluminum alloy solution is controlled to be 0.022%, and aluminum titanium boron wires are fed into the aluminum liquid at the inlet of the degassing tank at a feeding speed of 128 mm/min.
10. A process for casting and rolling an aluminum alloy strip as claimed in claim 7, wherein the temperature of the molten aluminum alloy in the front box of the casting and rolling device is controlled to 700 ℃, the length of the casting and rolling area is 65mm, the casting and rolling speed is controlled to 850mm/min, the temperature of the cooling liquid in the rolls is controlled to 30 ℃, and the pressure is controlled to 0.4 MPa.
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| CN114535522A (en) * | 2022-03-18 | 2022-05-27 | 贵州莹月帆铝制品有限公司 | Continuous casting and rolling equipment for producing aluminum plate and rolling method thereof |
| CN115449658B (en) * | 2022-08-16 | 2023-10-24 | 洛阳龙鼎铝业有限公司 | Production process for 8011L alloy cast-rolled blank without edge cracking |
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| JPH10192915A (en) * | 1997-01-09 | 1998-07-28 | Mitsubishi Heavy Ind Ltd | Rolling mill and rolling equipment |
| CN201002097Y (en) * | 2006-12-29 | 2008-01-09 | 李春治 | Composite type water-cooled casting and rolling roller core |
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Denomination of invention: Equipment and process for producing deep drawing performance aluminum alloy by casting and rolling method Effective date of registration: 20231102 Granted publication date: 20220624 Pledgee: Ningbo Cixi Rural Commercial Bank Co.,Ltd. Pledgor: Cixi Chima metal products Co.,Ltd. Registration number: Y2023980063693 |