CN110293211B - Production process of float magnesium alloy wide sheet - Google Patents
Production process of float magnesium alloy wide sheet Download PDFInfo
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- CN110293211B CN110293211B CN201910680037.6A CN201910680037A CN110293211B CN 110293211 B CN110293211 B CN 110293211B CN 201910680037 A CN201910680037 A CN 201910680037A CN 110293211 B CN110293211 B CN 110293211B
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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
- B22D11/0637—Accessories therefor
- B22D11/068—Accessories therefor for cooling the cast product during its passage through the mould surfaces
- B22D11/0691—Accessories therefor for cooling the cast product during its passage through the mould surfaces by cooling the side dams
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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
- B22D11/0637—Accessories therefor
- B22D11/0697—Accessories therefor for casting in a protected atmosphere
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C23/00—Alloys based on magnesium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/06—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of magnesium or alloys based thereon
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Continuous Casting (AREA)
- Metal Rolling (AREA)
Abstract
The invention relates to a production process of a float magnesium alloy wide sheet, wherein the whole production line comprises a tin remelting furnace, a tin pool, a silica glass remelting furnace, a silica glass liquid holding furnace, a magnesium alloy remelting furnace, a magnesium alloy purification furnace, a magnesium alloy holding furnace, a magnesium alloy outflow speed control system, a weir making device, an edge roller, a gas protection cover and an annealing device. The invention produces the ultra-wide and ultra-thin cast magnesium alloy sheet by a brand new process, adopts an open crystallization process, breaks through the limitation of the crystallizer in the prior art, has low energy consumption and high yield, is suitable for large-scale and continuous production, and accords with the development direction of the production technology of the magnesium alloy sheet to large breadth and low cost at present.
Description
Technical Field
The invention belongs to the technical field of metallurgy, and particularly relates to a production process of a float magnesium alloy wide sheet.
Background
Magnesium alloy sheet materials are generally divided by product thickness: 0.5 mm-5 mm is a thin plate, 6 mm-21 mm is a middle plate, and 22 mm-70 mm is a thick plate. Thin plates are generally positioned in 3C products and automobile manufacturing industries and light rail trains, and medium plates are generally applied to the fields of aviation and military industry. In the aspect of market price, the market price is different along with the difference of the width and the thickness of the magnesium alloy plate, generally ranges from 17 to 40 ten thousand yuan/ton, and the thinner the thickness is, the higher the price is. The insufficient width and high cost of the plate become the biggest obstacles for influencing the application of the magnesium alloy, and are the bottleneck of the development of the magnesium alloy.
The traditional rolling process flow is as follows: ingot preheating → smelting → purification → ingot casting → homogenization → washing → heating → hot rolling (multiple heating) → warm rolling (multiple annealing) → cold rolling → product annealing → sheet splitting → product stacking. The process has high cost, much time consumption and low yield, if thin plates are produced, the yield is lower, the quality of products in each batch is unstable, continuous production cannot be realized, the yield is limited, large-scale and industrial production cannot be supported, medium and thick plates can be produced for military enterprises only in small scale, the yield per year is about 1000t, and the thickness and the width of the products cannot meet the requirements of the current automobile manufacturing and electronic product markets.
The most advanced process of the magnesium alloy plate produced at present is a double-roller casting method, and the process flow is as follows: magnesium ingot preheating → smelting → magnesium liquid purification → twin-roll casting and rolling → little warm rolling → finished product annealing → plate splitting → finished product stacking and rolling. The configuration magnesium alloy plate which can be realized by the process at present has the maximum width of 650mm, and is limited by the process, and a very large problem is encountered when a certain width is increased. The application of the magnesium alloy plate on the automobile needs a magnesium alloy plate with a width of more than 1200mm, and the double-roll casting-rolling method is difficult to produce the plate with the width of more than 1200 mm.
Disclosure of Invention
The invention aims to provide a production process of a float magnesium alloy wide thin plate, which reduces the production cost of the magnesium alloy wide thin plate and can continuously produce an as-cast magnesium alloy rolled plate with the thickness of 4-8 mm and the width of more than 2500 mm.
In order to achieve the above object, the present invention provides a production process of a float magnesium alloy wide thin plate, the whole production line comprises a tin remelting furnace, a tin bath, a silica glass remelting furnace, a silica glass liquid holding furnace, a magnesium alloy remelting furnace, a magnesium alloy purification furnace, a magnesium alloy holding furnace, a magnesium alloy outflow speed control system, a weir making device, an edge roller, a gas protection cover and an annealing device, the production process comprises the following steps:
the method comprises the following steps: firstly, heating metal tin in a tin remelting furnace to about 1000 ℃ to obtain tin liquid, then transferring the tin liquid into a tin pool for heat preservation, gradually reducing the temperature of the tin pool from left to right, wherein the highest end is about 1000 ℃, the lowest end is about 400 ℃, a gas protection cover is arranged above the whole tin pool, and the gas protection cover is filled with protection gas;
step two: heating silica glass to about 1600 ℃ by adopting a silica glass remelting furnace, exhausting and deslagging to obtain glass melt liquid at about 1200 ℃, and then transferring the glass melt liquid into a silica glass liquid heat preservation furnace for heat preservation;
step three: remelting the magnesium alloy in a magnesium alloy remelting furnace to generate magnesium alloy molten liquid at the temperature of about 650 ℃, purifying the magnesium alloy molten liquid in a magnesium alloy purifying furnace, and transferring the magnesium alloy molten liquid into a magnesium alloy heat-preserving furnace for heat preservation;
step four: slowly pouring the glass melt liquid with the temperature of about 1200 ℃ into a tin pool storing the tin liquid in the step one, gradually spreading the glass melt liquid on the tin liquid under the combined action of surface tension and weight, and forming a glass melt liquid layer with the thickness of more than 5mm and uniform thickness under the action of an edge roller;
step five: when the glass melt liquid layer is pulled to a temperature zone of about 800 ℃ by an edge roller, the glass melt liquid of about 1200 ℃ prepared in the step two is respectively poured into the upper parts of two sides of the solidified glass plate by adopting weir making equipment, the newly poured glass melt liquid is rapidly solidified and adhered with the glass plate after contacting the glass plate, cofferdams with the height of more than 10mm are formed on the upper parts of two sides of the glass plate, and the function of preventing the magnesium alloy melt liquid from flowing into a tin pool from two sides is achieved;
step six: the glass plate with the cofferdam obtained in the fifth step moves forwards slowly to the right under the pulling of the edge roller, when the temperature reaches about 750 ℃, magnesium alloy molten liquid at about 650 ℃ prepared in the third step is added above the glass plate by utilizing a magnesium alloy outflow speed control system, the magnesium alloy molten liquid is gradually spread on the glass plate and moves forwards along with the glass plate, and when the temperature reaches about 600 ℃, the magnesium alloy molten liquid is completely spread;
step seven: when the glass plate in the sixth step is pulled to a temperature area of about 500 ℃ by the edge roller, the magnesium alloy molten liquid is solidified into a magnesium alloy plate, and the magnesium alloy plate and the glass plate are pulled out of the tin pool by the edge roller and enter an annealing device;
step eight: in an annealing device, separating the magnesium alloy sheet from the glass sheet to obtain an as-cast magnesium alloy sheet, rolling and finishing the as-cast magnesium alloy sheet to obtain an as-cast magnesium alloy rolled sheet with the width of more than 2500mm and the thickness of 4-8 mm, coiling the as-cast magnesium alloy rolled sheet, and warehousing, wherein the glass sheet is crushed and reused.
Preferably, the first step, the second step and the third step are simultaneously carried out, so that the production efficiency can be improved.
Preferably, the protective gas is composed of sulfur hexafluoride and argon.
The working principle of the invention is that a glass melt liquid layer with uniform thickness is formed on tin liquid by utilizing the surface tension and gravity of the tin liquid and the glass melt liquid, and is solidified into a glass plate, and an as-cast magnesium alloy sheet with smooth surface is produced on the glass plate floating on the tin liquid.
The invention has the advantages that the process breaks through the limitation of the crystallizer in the prior art, adopts an open crystallization process to produce wide sheets, has low energy consumption and high yield, is suitable for large-scale and continuous production, and can produce wider and thinner magnesium alloy sheets by using the magnesium alloy sheets produced by the invention along with the maturity and progress of the technology. The invention produces the ultra-wide and ultra-thin cast magnesium alloy sheet by a brand-new process, and accords with the development direction of the production technology of the magnesium alloy sheet to large breadth and low cost at present.
Detailed Description
The present invention will be described more clearly with reference to specific embodiments thereof, which are given by way of illustration only and are not to be taken by way of limitation. All other embodiments, which can be obtained by those skilled in the art without any inventive step based on the embodiments of the present invention, should be included in the scope of the present invention.
Examples
The invention provides a production process of a float magnesium alloy wide sheet, wherein the whole production line comprises a tin remelting furnace, a tin pool, a silica glass remelting furnace, a silica glass liquid holding furnace, a magnesium alloy remelting furnace, a magnesium alloy purifying furnace, a magnesium alloy holding furnace, a magnesium alloy outflow speed control system, a weir making device, an edge roller, a gas protection cover and an annealing device, and the production process comprises the following steps:
the method comprises the following steps: firstly, heating metal tin in a tin remelting furnace to 1000 ℃ to obtain tin liquid, then transferring the tin liquid into a tin pool for heat preservation, wherein the temperature of the tin pool gradually decreases from left to right, the highest end is 1000 ℃, the lowest end is 400 ℃, a gas protection cover is arranged above the whole tin pool, and is filled with protective gas, and the protective gas consists of sulfur hexafluoride and argon;
step two: heating silica glass to 1600 ℃ by adopting a silica glass remelting furnace, exhausting and deslagging to obtain 1200 ℃ glass melt, and then transferring the glass melt into a silica glass melt heat preservation furnace for heat preservation;
step three: remelting the magnesium alloy in a magnesium alloy remelting furnace to generate 650 ℃ magnesium alloy molten liquid, purifying the molten liquid in a magnesium alloy purifying furnace, and transferring the molten liquid into a magnesium alloy heat-preserving furnace for heat preservation;
step four: slowly pouring the glass melt liquid with the temperature of 1200 ℃ into the tin pool storing the tin liquid in the step one, gradually spreading the glass melt liquid on the tin liquid under the combined action of surface tension and weight, and forming a glass melt liquid layer with the thickness of more than 5mm and uniform thickness under the action of an edge roller;
step five: when the glass melt liquid layer is drawn to a temperature zone of 800 ℃ by an edge-drawing machine, respectively pouring 1200 ℃ glass melt liquid prepared in the step two above two sides of a solidified glass plate by adopting weir-making equipment, rapidly solidifying and adhering the newly poured glass melt liquid after contacting the glass plate, and forming cofferdams with the height of more than 10mm above the two sides of the glass plate to play a role in preventing magnesium alloy melt liquid from flowing into a tin pool from the two sides;
step six: the glass plate with the cofferdam obtained in the fifth step moves forwards slowly to the right under the pulling of the edge roller, when the temperature reaches 750 ℃, the 650 ℃ magnesium alloy molten liquid prepared in the third step is added above the glass plate by utilizing a magnesium alloy outflow speed control system, the magnesium alloy molten liquid is gradually spread on the glass plate and moves forwards along with the glass plate, and when the temperature reaches 600 ℃, the magnesium alloy molten liquid is completely spread;
step seven: when the glass plate in the sixth step is pulled to a temperature of 500 ℃ by the edge roller, the magnesium alloy molten liquid is solidified into a magnesium alloy plate, and the magnesium alloy plate and the glass plate are pulled out of the tin pool by the edge roller and enter an annealing device;
step eight: in an annealing device, separating the magnesium alloy sheet from the glass sheet to obtain an as-cast magnesium alloy sheet, rolling and finishing the as-cast magnesium alloy sheet to obtain an as-cast magnesium alloy rolled sheet with the width of more than 2500mm and the thickness of 4-8 mm, coiling the as-cast magnesium alloy rolled sheet, and warehousing, wherein the glass sheet is crushed and reused.
The working principle of the invention is that a glass melt liquid layer with uniform thickness is formed on tin liquid by utilizing the surface tension and gravity of the tin liquid and the glass melt liquid, and is solidified into a glass plate, and an as-cast magnesium alloy sheet with smooth surface is produced on the glass plate floating on the tin liquid.
Having described embodiments of the present invention, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the illustrated embodiments.
Claims (3)
1. A production process of a float magnesium alloy wide sheet is characterized in that the whole production line comprises a tin remelting furnace, a tin pool, a silica glass remelting furnace, a silica glass liquid holding furnace, a magnesium alloy remelting furnace, a magnesium alloy purifying furnace, a magnesium alloy holding furnace, a magnesium alloy outflow speed control system, a weir making device, an edge roller, a gas protection cover and an annealing device, and the production process comprises the following steps:
the method comprises the following steps: firstly, heating metal tin in a tin remelting furnace to 1000 ℃ to obtain tin liquid, then transferring the tin liquid into a tin pool for heat preservation, gradually reducing the temperature of the tin pool from left to right, wherein the highest end is 1000 ℃, the lowest end is 400 ℃, a gas protection cover is arranged above the whole tin pool, and the gas protection cover is filled with protection gas;
step two: heating silica glass to 1600 ℃ by adopting a silica glass remelting furnace, exhausting and deslagging to obtain 1200 ℃ glass melt, and then transferring the glass melt into a silica glass melt heat preservation furnace for heat preservation;
step three: remelting the magnesium alloy in a magnesium alloy remelting furnace to generate 650 ℃ magnesium alloy molten liquid, purifying the molten liquid in a magnesium alloy purifying furnace, and transferring the molten liquid into a magnesium alloy heat-preserving furnace for heat preservation;
step four: slowly pouring the glass melt liquid with the temperature of 1200 ℃ into the tin pool storing the tin liquid in the step one, gradually spreading the glass melt liquid on the tin liquid under the combined action of surface tension and weight, and forming a glass melt liquid layer with the thickness of more than 5mm and uniform thickness under the action of an edge roller;
step five: when the glass melt liquid layer is drawn to a temperature zone of 800 ℃ by an edge-drawing machine, respectively pouring 1200 ℃ glass melt liquid prepared in the step two above two sides of a solidified glass plate by adopting weir-making equipment, rapidly solidifying and adhering the newly poured glass melt liquid after contacting the glass plate, and forming cofferdams with the height of more than 10mm above the two sides of the glass plate to play a role in preventing magnesium alloy melt liquid from flowing into a tin pool from the two sides;
step six: the glass plate with the cofferdam obtained in the fifth step moves forwards slowly to the right under the pulling of the edge roller, when the temperature reaches 750 ℃, the 650 ℃ magnesium alloy molten liquid prepared in the third step is added above the glass plate by utilizing a magnesium alloy outflow speed control system, the magnesium alloy molten liquid is gradually spread on the glass plate and moves forwards along with the glass plate, and when the temperature reaches 600 ℃, the magnesium alloy molten liquid is completely spread;
step seven: when the glass plate in the sixth step is pulled to a temperature of 500 ℃ by the edge roller, the magnesium alloy molten liquid is solidified into a magnesium alloy plate, and the magnesium alloy plate and the glass plate are pulled out of the tin pool by the edge roller and enter an annealing device;
step eight: in an annealing device, separating the magnesium alloy sheet from the glass sheet to obtain an as-cast magnesium alloy sheet, rolling and finishing the as-cast magnesium alloy sheet to obtain an as-cast magnesium alloy rolled sheet with the width of more than 2500mm and the thickness of 4-8 mm, coiling the as-cast magnesium alloy rolled sheet, and warehousing, wherein the glass sheet is crushed and reused.
2. The process for producing a wide float magnesium alloy sheet according to claim 1, wherein: and simultaneously performing the first step, the second step and the third step.
3. The process for producing a wide float magnesium alloy sheet according to claim 1, wherein: the protective gas consists of sulfur hexafluoride and argon.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910680037.6A CN110293211B (en) | 2019-07-26 | 2019-07-26 | Production process of float magnesium alloy wide sheet |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910680037.6A CN110293211B (en) | 2019-07-26 | 2019-07-26 | Production process of float magnesium alloy wide sheet |
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| CN110293211A CN110293211A (en) | 2019-10-01 |
| CN110293211B true CN110293211B (en) | 2021-04-09 |
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Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2022571A (en) * | 1933-03-03 | 1935-11-26 | Cleveland Graphite Bronze Co | Method of producing bimetallic strips |
| US2298348A (en) * | 1940-05-11 | 1942-10-13 | Remington Arms Co Inc | Formation of metal shapes |
| US2754559A (en) * | 1955-02-11 | 1956-07-17 | Howard A Fromson | Method for the casting of sheets of a fusible material |
| US3151366A (en) * | 1957-12-11 | 1964-10-06 | Howard A Fromson | Method and apparatus for the casting of fusible materials |
| JPS59153552A (en) * | 1983-02-22 | 1984-09-01 | Nippon Kokan Kk <Nkk> | Horizontal continuous casting equipment of thin walled billet |
| JPH04187532A (en) * | 1990-11-20 | 1992-07-06 | Kubota Corp | Production of roll for plate glass production |
| US5165960A (en) * | 1991-07-29 | 1992-11-24 | Ford Motor Company | Deposition of magnesium fluoride films |
| JP2005314186A (en) * | 2004-04-30 | 2005-11-10 | Ohcera Co Ltd | Refractory for float bath and float bath |
| CN103253864A (en) * | 2012-02-17 | 2013-08-21 | 信义光伏产业(安徽)控股有限公司 | Ultra clear float solar battery glass production process and product thereof |
| CN105586518A (en) * | 2014-10-23 | 2016-05-18 | 无锡华冶钢铁有限公司 | Machining forming manufacturing method for glass tin bath made of 5Cr2NiMnVSi magnesium alloy |
-
2019
- 2019-07-26 CN CN201910680037.6A patent/CN110293211B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2022571A (en) * | 1933-03-03 | 1935-11-26 | Cleveland Graphite Bronze Co | Method of producing bimetallic strips |
| US2298348A (en) * | 1940-05-11 | 1942-10-13 | Remington Arms Co Inc | Formation of metal shapes |
| US2754559A (en) * | 1955-02-11 | 1956-07-17 | Howard A Fromson | Method for the casting of sheets of a fusible material |
| US3151366A (en) * | 1957-12-11 | 1964-10-06 | Howard A Fromson | Method and apparatus for the casting of fusible materials |
| JPS59153552A (en) * | 1983-02-22 | 1984-09-01 | Nippon Kokan Kk <Nkk> | Horizontal continuous casting equipment of thin walled billet |
| JPH04187532A (en) * | 1990-11-20 | 1992-07-06 | Kubota Corp | Production of roll for plate glass production |
| US5165960A (en) * | 1991-07-29 | 1992-11-24 | Ford Motor Company | Deposition of magnesium fluoride films |
| JP2005314186A (en) * | 2004-04-30 | 2005-11-10 | Ohcera Co Ltd | Refractory for float bath and float bath |
| CN103253864A (en) * | 2012-02-17 | 2013-08-21 | 信义光伏产业(安徽)控股有限公司 | Ultra clear float solar battery glass production process and product thereof |
| CN105586518A (en) * | 2014-10-23 | 2016-05-18 | 无锡华冶钢铁有限公司 | Machining forming manufacturing method for glass tin bath made of 5Cr2NiMnVSi magnesium alloy |
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| CN110293211A (en) | 2019-10-01 |
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