CN110039019B - Multi-path parallel casting and rolling method, casting and rolling system and melt feeding device for casting and rolling - Google Patents
Multi-path parallel casting and rolling method, casting and rolling system and melt feeding device for casting and rolling Download PDFInfo
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- CN110039019B CN110039019B CN201910314800.3A CN201910314800A CN110039019B CN 110039019 B CN110039019 B CN 110039019B CN 201910314800 A CN201910314800 A CN 201910314800A CN 110039019 B CN110039019 B CN 110039019B
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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
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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
- B22D11/10—Supplying or treating molten metal
- B22D11/103—Distributing the molten metal, e.g. using runners, floats, distributors
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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
- B22D11/14—Plants for continuous casting
- B22D11/147—Multi-strand plants
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Abstract
The invention relates to a multi-path parallel casting and rolling method, a casting and rolling system and a melt feeding device for casting and rolling. The casting and rolling system comprises a casting and rolling device and a molten liquid feeding device which is arranged at the upstream of the casting and rolling device and used for providing molten metal for the casting and rolling device, wherein the molten liquid feeding device comprises a front box used for containing the molten metal and a molten liquid runner which is connected with the front box and used for conveying the molten metal in the front box to the casting and rolling device, the molten liquid runner comprises more than two sub-runners, and a liquid inlet of each sub-runner is connected with a liquid outlet of the front box; the casting and rolling device comprises casting and rolling machines which are arranged in one-to-one correspondence with the sub runners and are used for respectively casting and rolling the molten metal conveyed by the sub runners. The casting and rolling system realizes that one set of smelting system provides molten metal required by production for a plurality of sets of casting and rolling devices through more than two sub-runners and the casting and rolling machines arranged in one-to-one correspondence with the sub-runners, so that the casting and rolling efficiency and the material utilization rate are improved, and the production cost is reduced.
Description
Technical Field
The invention belongs to the field of continuous casting and rolling of metal plates, and particularly relates to a multi-path parallel casting and rolling method, a multi-path parallel casting and rolling system and a melt feeding device for casting and rolling.
Background
The principle of the continuous casting and rolling technology is that molten metal enters a gap between two relatively rotating casting rollers through a nozzle system, heat of molten metal is taken away through a cooling system in the casting rollers, so that the molten metal is directly formed into a solid plate and strip, the casting rollers simultaneously play roles of a crystallizer and rolling in the whole process, and short-flow continuous production of the plate and strip can be completed.
The continuous casting and rolling process is mainly used for preparing aluminum plates and strips at present and has the characteristics of small occupied area, short process flow and the like. Chinese patent application publication No. CN106269870A discloses an inclined aluminum plate casting and rolling machine and a casting and rolling method, the casting and rolling machine includes a degassing system, a filtering system, a front box, a casting nozzle, an inclined casting and rolling machine body, a spraying system, a shearing machine and a plate rolling machine which are arranged in sequence, the inclined casting and rolling machine includes an upper roller, a lower roller, a bracket and an inclined driving device; the front box and the casting nozzle connected with the front box through the molten liquid runner form a molten liquid feeding device for conveying molten aluminum between the upper roller and the lower roller of the inclined casting and rolling machine, and the molten aluminum enters the roller gaps of the upper roller and the lower roller through the casting nozzle for casting and rolling. During casting and rolling, the degassed aluminum liquid is filtered and purified by a filtering system and then enters a front box, and a casting nozzle is opened to enable the aluminum liquid to enter a roll gap through the casting nozzle for casting and rolling.
For the cast rolling of aluminum plate and strip, the casting speed should not be too fast, and is generally only 0.5-1.2 m/min. The casting and rolling efficiency of the casting and rolling method and the casting and rolling equipment is low due to the casting and rolling characteristics of the aluminum plate strip.
Disclosure of Invention
The invention aims to provide a multi-path casting and rolling machine parallel casting and rolling system to solve the problem of low casting and rolling efficiency of the existing casting and rolling equipment.
The second purpose of the present invention is to provide a multi-way parallel casting and rolling method, so as to solve the problem of low casting and rolling efficiency of the existing casting and rolling method.
A third object of the present invention is to provide a molten metal feeding device for casting and rolling, which solves the problem of low feeding efficiency of the conventional molten metal feeding device.
In order to achieve the aim, the technical scheme adopted by the parallel casting and rolling system of the multi-path casting and rolling machine is as follows:
a multi-path casting and rolling machine parallel casting and rolling system comprises a casting and rolling device and a molten liquid feeding device which is arranged at the upstream of the casting and rolling device and used for providing molten metal for the casting and rolling device, wherein the molten liquid feeding device comprises a front box used for containing the molten metal and a molten liquid runner which is connected with the front box and used for conveying the molten metal in the front box to the casting and rolling device, the molten liquid runner comprises more than two branch runners, and a liquid inlet of each branch runner is connected with a liquid outlet of the front box; the casting and rolling device comprises casting and rolling machines which are arranged in one-to-one correspondence with the sub runners and are used for respectively casting and rolling the molten metal conveyed by the sub runners.
The multi-channel casting and rolling machine parallel casting and rolling system provided by the invention has the advantages that one set of smelting system is used for providing molten metal required by production for a plurality of sets of casting and rolling devices through more than two sub-runners and the casting and rolling machines arranged in one-to-one correspondence with the sub-runners, so that the casting and rolling efficiency and the material utilization rate are improved, and the production cost is reduced.
In order to facilitate the production and assembly of the casting and rolling production line, preferably, the liquid outlet of the front box is connected with a three-way connector, the three-way connector comprises a liquid inlet and two liquid outlets, the liquid inlet of the three-way connector is connected with the liquid outlet of the front box, and the two liquid outlets of the three-way connector are respectively connected with the liquid inlets of the two branch runners.
In order to further ensure the stable distribution of the molten metal, preferably, the sectional area of the liquid inlet of the three-way connector is equal to the sum of the sectional areas of the two liquid outlets of the three-way connector.
The technical scheme adopted by the multipath parallel casting and rolling method is as follows:
a multi-path parallel casting and rolling method comprises the following steps: and (3) dividing the molten metal to form more than two paths of divided molten metal, and respectively casting and rolling the more than two paths of divided molten metal to obtain the molten metal.
According to the multi-path parallel casting and rolling method provided by the invention, the molten metal is divided, the divided molten metal is cast and rolled respectively, one set of smelting system corresponds to more than two sets of casting and rolling production units, one equipment and more dry-active parts are realized, the large-batch continuous short-flow production of plates and strips is optimized, the production efficiency and the material utilization rate are improved, and the production cost is reduced.
In order to obtain a high yield of sheet metal strip, the molten metal is preferably an aluminum melt. In order to further improve the casting and rolling performance of the plate and strip, preferably, the temperature of the split flow molten liquid before casting and rolling is 670-.
In order to improve the component stability of the molten metal, the molten metal is preferably obtained by smelting and purifying a metal raw material, and the smelting temperature is 670-750 ℃. In order to further improve the process adaptability of continuous casting and rolling, the metal raw material is preferably 1 series, 3 series or 5 series aluminum alloy.
The technical scheme adopted by the melt feeding device for casting and rolling is as follows:
the molten liquid feeding device for casting and rolling comprises a front box for containing molten metal and a molten liquid runner which is connected with the front box and used for conveying the molten metal in the front box to a corresponding casting and rolling device, wherein the molten liquid runner comprises more than two sub-runners, and a liquid inlet of each sub-runner is connected with a liquid outlet of the front box.
The molten liquid feeding device for casting and rolling is connected with the liquid outlet of the front box through more than two sub-runners, and the casting and rolling machines can be arranged on the sub-runners in a one-to-one correspondence mode, so that the molten metal feeding efficiency is improved under the same casting and rolling condition, and the casting and rolling efficiency is improved.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of a multi-caster parallel casting and rolling system of the present invention;
FIG. 2 is a schematic view showing the height of the liquid level of a tilting casting front box in embodiment 1 of the multi-pass parallel casting method of the present invention;
in the figure, 1-smelting furnace, 2-standing furnace, 3-main runner, 4-front box, 5-three-way connector, 6-molten metal, 7-splitter box, 8-casting nozzle, 9-casting and rolling machine, 10-plate and strip material, 11-tractor, 12-shearing machine, 13-straightener and 14-coiler.
Detailed Description
The invention mainly adds another (or a plurality of) casting and rolling production units by connecting one (or a plurality of) casting and rolling machines in parallel between a front box and the casting and rolling machines of a continuous casting and rolling production line by utilizing a three (or more) through pipe. That is, only one set of smelting system is needed, and two (or more) sets of casting, casting and rolling and drawing coiling systems simultaneously carry out bidirectional (or multidirectional) discharging.
In order to better control the melt supply at the moment of solidification and maintain the required pressure, the molten metal is led out from the front box and is shunted, the shunted molten metal formed after shunting enters a roll gap of an inclined casting and rolling machine for casting and rolling, and the central connecting line of an upper roll and a lower roll of the inclined casting and rolling machine is inclined backwards by 15 degrees relative to a perpendicular bisector. The liquid level of the molten metal in the front box is 25-35mm higher than the center of the roll gap.
The following further describes embodiments of the present invention with reference to the drawings.
An embodiment of a multi-way caster parallel casting and rolling system of the present invention is shown in fig. 1, and comprises a casting and rolling device and a melt feeding device arranged at the upstream of the casting and rolling device for providing molten metal 6 to the casting and rolling device, wherein the melt feeding device comprises a front box 4 for accommodating the molten metal 6, a three-way connector 5 for shunting the molten metal 6 conveyed by the front box 4 is connected to a liquid outlet of the front box 4, the three-way connector 5 comprises a liquid inlet and two liquid outlets, the liquid inlet of the three-way connector 5 is connected to the liquid outlet of the front box 4, two liquid outlets of the three-way connector 5 are respectively and correspondingly connected to a shunting groove 7 for conveying the shunted molten metal 6, the liquid outlet of each shunting groove 7 is connected to a casting nozzle 8, two casting and rolling machines 9 for casting and rolling the molten metal 6 conveyed by the shunting groove 7 are respectively and correspondingly arranged at the liquid outlets of each casting nozzle 8 (the two casting and rolling devices connected in parallel in fig. 1 are simultaneously arranged on a horizontal plane, both of the same height). The casting and rolling machine comprises an upper casting roller and a lower casting roller, and a liquid outlet of the casting nozzle 8 is arranged opposite to a roller gap of the upper casting roller and the lower casting roller. Downstream of the casting and rolling machine 9, a tractor 11, a shear 12, a leveler 13, and a coiler 14 are provided in this order.
The casting and rolling machine is inclined, and the central connecting line of the upper roller and the lower roller is inclined 15 degrees backwards relative to the perpendicular bisector. The sectional area of the liquid inlet of the three-way connector 5 is equal to the sum of the sectional areas of the two liquid outlets of the three-way connector 5. In order to ensure the average flow distribution of the molten metal 6, the turning positions in the three-way connector 5 are all in round angle smooth transition so as to stabilize the flow speed and simultaneously facilitate the rapid passing of the liquid.
The upper reaches of the melt feeding device are provided with a smelting furnace 1, a standing furnace 2 connected with the outlet of the smelting furnace 1, and a main runner 3 connected with the outlet of the standing furnace 2, wherein the outlet of the main runner 3 is connected with the liquid inlet of a front box 4 of the melt feeding device.
The working process of the multi-path casting and rolling machine parallel casting and rolling system of the embodiment is as follows: (1) the method comprises the steps of adding raw materials such as aluminum ingots, waste materials to be recycled and the like which are prepared according to a certain proportion into a smelting furnace 1 after pretreatment such as surface oil and rust removal, wherein the components and impurity content of the raw materials need to be checked before the furnace charge enters the smelting furnace 1, heating and melting the raw materials in the smelting furnace 1, and performing atmosphere protection in the smelting process; the melted melt (i.e., molten metal 6) is transferred to the static furnace 2 for further melt purification and component adjustment. (2) The melt in the standing furnace 2 enters a front box 4 through a main runner 3, the height of the liquid level of the melt in the front box 4 is controlled to be 25mm-30mm higher than the center of a roll gap (1/2 position of the central connecting line of an upper roller and a lower roller), after the molten metal 6 is divided by a three-way connector 5, the divided molten metal 6 respectively enters corresponding casting nozzles 8 through a dividing chute 7, and the required molten metal 6 is provided for the subsequent two groups of casting and rolling machine systems. In order to ensure the quality of the melt in the transfer process, the main runner 3, the front box 4, the three-way connector 5 and the splitter box 7 are prepared and processed in advance, and are heated and dried, and all the components are made of heat-insulating refractory materials. (3) The casting nozzle 8 sprays the shunted molten metal 6 into the roll gaps of the corresponding casting and rolling machines 9 respectively, and the two casting and rolling machines 9 run simultaneously to synchronously finish the solidification crystallization and rolling work from the liquid metal to the solid plate strip 10. (4) And (3) finishing the production of coiled products by the cast and rolled plate strip 10 through two sets of traction and curling systems (a traction machine 11, a shearing machine 12, a straightening machine 13 and a coiling machine 14).
In other embodiments of the multiple caster parallel casting system of the present invention, the parallel casting of the three-way caster can be achieved by using a four-way connector having one liquid inlet and three liquid outlets and correspondingly providing three corresponding runners and casting devices in one-to-one correspondence with the runners.
In the embodiment 1 of the multi-path parallel casting and rolling method, the two-path casting and rolling machine parallel casting and rolling system is utilized to produce 1050 aluminum materials with the thickness of 5 mm. The size of the casting roller is phi 640mm multiplied by 1600mm, and the following steps are specifically adopted: the method comprises the steps of conveying an aluminum melt obtained by smelting (the smelting temperature is 750 ℃) and purifying a metal raw material into a front box 4, shunting the aluminum melt in the front box 4 to form two paths of shunting melts, respectively feeding the two paths of shunting melts (the temperature of the shunting melts is 720 ℃) into an inclined casting and rolling machine through a casting nozzle 8 for casting and rolling, controlling the liquid level of the aluminum melt in the front box 4 to be 30mm higher than the center of a roll gap, controlling the roll gap to be 5.8mm, and shearing, straightening and post-treating a plate and strip obtained after casting and rolling to obtain the aluminum-based steel plate.
When the method of the embodiment is adopted for producing the aluminum plate strip, the total casting and rolling speed of the two sets of casting and rolling units can reach 2.0-4.0m/min, compared with the traditional ' one melting system ', the casting speed (0.5-1.2m/min) of the production process of one casting and rolling machine ' can be increased by 3-5 times, and meanwhile, the production cost can be saved by 30-50%.
In embodiment 2 of the multi-path parallel casting and rolling method, the two-path casting and rolling machine parallel casting and rolling system is utilized to produce 3003 aluminum material with the thickness of 6mm, the size of a casting roller is phi 640mm multiplied by 1600mm, and the method specifically adopts the following steps: the method comprises the steps of smelting metal raw materials (the smelting temperature is 700 ℃), purifying to obtain aluminum melt, conveying the aluminum melt into a front box, shunting the aluminum melt in the front box to form two paths of shunting melt (the temperature of the shunting melt is 670 ℃), respectively feeding the two paths of shunting melt into an inclined casting and rolling machine through a casting nozzle for casting and rolling, controlling the liquid level of the aluminum melt in the front box to be 25mm higher than the center of a roll gap, controlling the roll gap to be 6.5mm, and shearing, straightening and then processing the plate and strip obtained after casting and rolling.
The liquid level of the molten metal in the front box according to the method of the embodiment will be described below.
In the casting area, the melt supply at the moment of solidification and the pressure required for maintaining are controlled by the static pressure at the melt level of the front box. If the liquid level is too low, the pressure for supplying molten metal is too low, and the cast-rolling plate surface is easy to have defects such as holes and the like; the liquid level is too high, which easily causes the surface quality problems of the cast rolling plate surface such as edge formation, oxide skin and the like.
In fig. 2, assuming that the pressure Δ p generated by the height of the liquid surface of the front box 4 against the molten metal in the gap between the lower nozzle and the casting roll is:
Δ p ═ ρ g (H ″ + H') (formula i-1);
in the formulae 1-1 and 1-2, rho-density of molten metal, g/cm3(ii) a H' -the height from the liquid level of the front box 4 to the center of the roll gap is mm; h "-additional height produced by tilting the caster by 15 °, mm; r-radius of casting roller, mm; z-length of casting-rolling area, mm; delta-thickness of the cast-rolled blank, mm.
The maximum additional pressure Δ p' generated by the surface tension of the molten metal at the gap is: Δ p ═ 2 σ/dcWhere σ -surface tension of molten metal, N/m, dcThe gap between the nozzle 8 and the casting roll, mm.
In the twin-caster system according to the embodiment, to ensure that the molten metal does not leak from the gap between the nozzle 8 and the casting roll, there should be: 2 delta p' is more than or equal to delta p.
Namely, the height H' from the liquid level of the front box 4 to the center of the roll gap needs to satisfy the following requirements:
on a casting and rolling machine with phi 640mm multiplied by 1600mm, R is 320mm, delta is 1.2mm, and rho is 2.3g/cm3And sigma is 0.86N/m. When Z is 50mm, dcWhen 1.2mm is taken, H 'is 52.96mm according to the formula 1-2, and H' is less than or equal to 71.68mm according to the formula 1-3, so that the maximum allowable front box liquid level height of the casting area of the double-set casting and rolling system designed by the invention is 71 mm.
In actual production, for a traditional single-set inclined casting and rolling machine, the liquid level of the front box is usually controlled to be 10-20mm higher than the casting and rolling center line on the premise that H' is smaller than the maximum allowable height. Therefore, for the casting and rolling system with the double casting and rolling machines arranged in parallel, on the premise that H' is smaller than the maximum allowable height of 71mm, the liquid level height of the front box is controlled to be 25-35mm higher than the casting and rolling center line, and the casting and rolling effect is better.
High-efficiency production of 1-series aluminum alloy (Al content: 99.9 wt.%, corresponding to the designations 1020, 1060, 1100, 1150, 1170, 1175, 1180, 1185, 1193, 1199, 1200, 1230, 1260, 1345, 1350, 1370, 1385, 1435, etc.), or 3-series aluminum alloy (aluminum-manganese alloy: Mn 1.0-1.5 wt.%, balance Al; corresponding to the designations 3002, 3003, 3009, 3010, 3011, 3012, 3015, 3103, 3104, 3A12, 3A21, 3203, 3303, etc.), or 5-series aluminum alloy (aluminum-magnesium alloy: Mg 4.0-4.9 wt.%, balance Al; corresponding to the designations 5005, 5010, 5013, 5014, 5016, 5040, 5042, 5043, 5049, 5050, 5051, Mg 2, 506, 5082, 5083, 5186, 5150, 515450, 515454, 5257, 5354, 5654, etc.) may be carried out by the method of the present in reference example; for other metal strips, the method can be used for production according to the embodiment, and the corresponding effect of improving the casting and rolling efficiency can be achieved.
In the embodiment of the melt supply device for casting and rolling according to the present invention, the structure of the melt supply device for casting and rolling is the same as that of the melt supply device in the multi-way casting and rolling machine parallel casting and rolling system, and details thereof are not described herein.
Claims (7)
1. A multi-channel casting and rolling machine parallel casting and rolling system comprises a casting and rolling device and a molten liquid feeding device which is arranged at the upstream of the casting and rolling device and used for providing molten metal for the casting and rolling device, wherein the molten liquid feeding device comprises a front box used for containing the molten metal and a molten liquid runner which is connected with the front box and used for conveying the molten metal in the front box to the casting and rolling device; the casting and rolling device comprises a casting and rolling machine which is arranged in one-to-one correspondence with the sub-runners and is used for respectively casting and rolling the molten metal conveyed by the sub-runners, the casting and rolling machine is inclined, and the central connecting line of the upper roller and the lower roller is inclined backward by 15 degrees relative to the perpendicular bisector; the liquid outlet of the front box is connected with a three-way connector, the three-way connector comprises a liquid inlet and two liquid outlets, the liquid inlet of the three-way connector is connected with the liquid outlet of the front box, and the two liquid outlets of the three-way connector are respectively connected with the liquid inlets of the two branch channels; when in use, the liquid level of the molten metal in the front box is 25-35mm higher than the center of the roll gap of the casting and rolling machine.
2. The multiple caster parallel casting and rolling system of claim 1 wherein the cross-sectional area of the inlet port of the three-way connector is equal to the sum of the cross-sectional areas of the two outlet ports of the three-way connector.
3. A multiple parallel casting method using the multiple casting-rolling mill parallel casting-rolling system according to claim 1, characterized by comprising the steps of: and (3) dividing the molten metal to form more than two paths of divided molten metal, and respectively casting and rolling the more than two paths of divided molten metal to obtain the molten metal.
4. The multi-pass parallel casting and rolling method according to claim 3, wherein the molten metal is molten aluminum.
5. The multi-way parallel casting and rolling method as claimed in claim 3 or 4, wherein the temperature of the split melt before casting and rolling is 670-.
6. The multi-pass parallel casting and rolling method as claimed in claim 3 or 4, wherein the molten metal is obtained by melting and purifying a metal raw material, and the melting temperature is 670-750 ℃.
7. The multiple parallel casting and rolling method according to claim 6, wherein the metal stock is a 1-series, 3-series, or 5-series aluminum alloy.
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| CN114535520B (en) * | 2022-03-03 | 2024-05-03 | 洛阳万基铝钛合金新材料有限公司 | Method for adjusting roll gap of casting and rolling machine without stopping |
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