CN108380849B - application method of tundish for vacuum ingot casting - Google Patents
application method of tundish for vacuum ingot casting Download PDFInfo
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- CN108380849B CN108380849B CN201810554421.7A CN201810554421A CN108380849B CN 108380849 B CN108380849 B CN 108380849B CN 201810554421 A CN201810554421 A CN 201810554421A CN 108380849 B CN108380849 B CN 108380849B
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- steel
- tundish
- cavity
- slag
- molten steel
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Classifications
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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
- B22D18/00—Pressure casting; Vacuum casting
- B22D18/06—Vacuum casting, i.e. making use of vacuum to fill the mould
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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
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
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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
- B22D43/00—Mechanical cleaning, e.g. skimming of molten metals
- B22D43/001—Retaining slag during pouring molten metal
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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
- B22D7/00—Casting ingots, e.g. from ferrous metals
- B22D7/12—Appurtenances, e.g. for sintering, for preventing splashing
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
- Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
Abstract
the invention discloses an application method of a tundish for vacuum ingot casting, which comprises the following steps: before steel is poured, a stopper rod is lowered to block a water gap, and a gate is lowered to block a steel discharge port; pouring steel, wherein molten steel enters the outer cavity through a steel pouring inlet, and slag inclusion floats upwards through a flow field with the outer cavity upwards; when the liquid level of the steel rises to 1/2 of the height below the outer-layer steel passing channel, the lifting gate opens the outer-layer slag weir steel discharge port, the molten steel enters the middle cavity through the outer-layer slag weir steel discharge port, and the steel casting speed is controlled, so that the liquid level of the outer-cavity steel and the liquid level of the middle cavity steel simultaneously reach the outer-layer steel passing channel; when the molten steel level of the middle cavity of the tundish reaches 2/3 of the height below the inner-layer steel passing channel, lifting the inner-layer slag-blocking weir gate, opening the steel discharge port, and lifting the stopper device to open the water gap; controlling the steel casting speed, and leading the molten steel to enter the water inlet through the opening. When the liquid level of the molten steel in the inner cavity is close to the opening, the stopper rod is lowered to block the opening, and the molten steel enters the water inlet from the steel outlet of the square slag weir. The invention is convenient for floating of slag inclusion; and the bearing is even, and the casting is stable.
Description
Technical Field
The invention relates to the technical field of vacuum ingot casting, in particular to a tundish for vacuum ingot casting.
Background
the tundish is a device which is positioned between a steel ladle and a vacuum chamber and used for casting molten steel, and mainly has the functions of realizing vacuum sealing, storing the molten steel, stabilizing the flow and the like.
the following problems mainly exist in the prior art:
1. The flow of the molten steel disturbs the molten steel liquid level in the tundish, and the steel slag formed on the surface of the molten steel can be impacted by the molten steel and enter a position deeper below the liquid level, particularly a water inlet and a water outlet are brought into the ingot mold to form slag inclusion;
2. the residence time of the molten steel in the tundish is short, and the temperature distribution is unreasonable;
3. the slag weir is often arranged on a single side, so that the tundish is not uniformly loaded, and the casting quality is influenced.
Disclosure of Invention
aiming at the problems, the invention discloses an application method of a tundish for vacuum ingot casting, wherein the tundish 1 comprises a water gap 2, a stopper device 3 arranged at the upper part of the water gap 2 and a steel pouring inlet 4, the tundish 1 is cylindrical and comprises two layers of annular slag dams, namely an inner layer slag dam 5 and an outer layer slag dam 6, and the outer layer slag dam 6 and the wall of the tundish 1 form a tundish outer cavity 11; the inner layer slag weir 5 and the outer layer slag weir 6 form a tundish middle cavity 12; the inner layer slag dam 5 forms a tundish inner cavity 13; the water gap 2 is positioned in the inner cavity 13 of the tundish; the steel pouring inlet 4 is positioned in the tundish outer cavity 11; the inner layer slag weir 5 and the outer layer slag weir 6 are higher than the molten steel level; a square slag weir 8 is arranged at the upper part of the water gap 2, and an opening 9 is formed in the top of the square slag weir 8 and used for penetrating through the stopper device 3; the bottoms of the inner layer slag weir 5, the outer layer slag weir 6 and the square slag weir 8 are all provided with steel discharge ports 7, and the bottom surfaces of the steel discharge ports 7 are flush with the bottom surface of the tundish 1; the steel discharge ports 7 of the inner layer slag dam 5 and the outer layer slag dam 6 are correspondingly provided with gates 71, and the gates 71 penetrate through the wall of the slag dam and can be lifted up and down for opening and closing the steel discharge ports 7; the steel pouring inlet 4 comprises a vertical steel pouring channel 41 and a steel discharging channel 42 arranged at the bottom of the steel pouring inlet 4, and the steel pouring channel 41 is connected with the steel discharging channel 42 in an arc shape; the middle parts of the inner layer slag weir 5 and the outer layer slag weir 6 are respectively provided with a steel passing channel comprising an inner layer steel passing channel 51 and an outer layer steel passing channel 61, the height of the inner layer steel passing channel 51 is higher than that of the outer layer steel passing channel 61, and an upward flow field is formed when the molten steel flows from the tundish middle cavity 13 to the tundish inner cavity 12; the steel passing channel is provided with an opening at the outer side lower than an opening at the inner side, and an upward flow field is formed when molten steel flows through the steel passing channel, and the method comprises the following steps:
The method comprises the following steps: before casting molten steel, lowering the stopper device 3 to block the water gap 2, lowering the gate 71 and blocking the steel discharge opening 7; pouring steel is carried out, molten steel enters the tundish outer cavity 11 through the steel pouring inlet 4, the steel pouring channel 41 and the steel discharging channel 42, the molten steel gradually rises in the tundish outer cavity 11, and slag inclusion floats upwards through an upward flow field;
Step two: when the liquid steel level rises to 1/2 of the height below the outer layer steel passing channel 61, the gate 71 is lifted, the steel discharge port 7 of the outer layer slag weir 6 is opened, the liquid steel enters the tundish middle cavity 12 through the steel discharge port 7 at the bottom of the outer layer slag weir 6, the liquid steel level of the tundish outer cavity 11 rises slowly, the steel casting speed is controlled, the liquid steel level in the tundish outer cavity 11 and the liquid steel level in the tundish middle cavity 12 reach the outer layer steel passing channel 61 at the same time, and the liquid steel level of the tundish outer cavity 11 and the tundish middle cavity 12 is ensured to keep a rising flow field all the time;
Step three: when the liquid steel level of the middle cavity 12 of the tundish reaches 2/3 of the height below the inner-layer steel passing channel 51, lifting the gate 71 of the inner-layer slag weir 5, opening the steel discharge port 7 of the inner-layer slag weir 5, on one hand, the liquid steel enters the water inlet 2 through the steel discharge port 7 at the bottom of the square slag weir 8, on the other hand, the liquid steel level in the middle cavity 12 of the tundish and the liquid steel level in the inner cavity 13 of the tundish continue to rise and reach the inner-layer steel passing channel 51 at the same time, and ensuring that the liquid steel levels of the middle cavity 12 of the tundish and the outer cavity 11 of the tundish always keep a rising; when the liquid steel level of the inner cavity 13 of the tundish reaches the inner layer steel passing channel 51, the stopper rod device 3 is lifted to open the water gap 2; controlling the steel casting speed, and enabling the molten steel to enter the water gap 2 through the open hole 9 and the steel discharge port 7 of the square slag weir 8;
step four: when the molten steel in the inner cavity 13 of the tundish faces the opening 9, the stopper device 3 is lowered to block the opening 9, and the molten steel enters the water inlet 2 only through the steel outlet 7 at the bottom of the square slag weir 8.
The method of the invention utilizes the design and control of the two layers of slag dams and the steel discharge gate to lead the molten steel to stay in the tundish for a long time and float the slag in enough time; meanwhile, the temperature of the molten steel is kept uniform, and the design of the annular slag dam ensures that the whole tundish is uniformly loaded and the casting is stable.
Drawings
Fig. 1 is a schematic structural view of the present invention.
FIG. 2 is a schematic diagram showing the relative positions of the steel discharge port of the inner and outer slag dams and the steel passing passage of the inner and outer layers.
FIG. 3 is a schematic view of the vertical section structure of the inner and outer layer steel passing channel of the present invention.
FIG. 4 is a schematic structural view of a vertical section of a steel pouring inlet of the invention.
Detailed Description
Reference is made to fig. 1, 2, 3, 4;
Fig. 2 shows the relative positions of the steel discharge opening 7 of the inner layer slag dam and the outer layer slag dam, the inner layer steel passing channel 51 and the outer layer steel passing channel 61.
Before casting molten steel, lowering the stopper device 3 to block the water gap 2, lowering the gate 71 and blocking the steel discharge opening 7; pouring steel is carried out, molten steel enters the tundish outer cavity 11 through the steel pouring inlet 4, the steel pouring channel 41 and the steel discharging channel 42, the molten steel gradually rises in the tundish outer cavity 11, and slag inclusion floats upwards through an upward flow field; when the liquid steel level rises to 1/2 of the height below the outer layer steel passing channel 61, the gate 71 is lifted, the steel discharge port 7 of the outer layer slag weir 6 is opened, the liquid steel enters the tundish middle cavity 12 through the steel discharge port 7 at the bottom of the outer layer slag weir 6, the liquid steel level of the tundish outer cavity 11 rises slowly, the steel casting speed is controlled, the liquid steel level in the tundish outer cavity 11 and the liquid steel level in the tundish middle cavity 12 reach the outer layer steel passing channel 61 at the same time, and the liquid steel level of the tundish outer cavity 11 and the tundish middle cavity 12 is ensured to keep a rising flow field all the time; when the liquid steel level of the middle cavity 12 of the tundish reaches 2/3 of the height below the inner-layer steel passing channel 51, lifting the gate 71 of the inner-layer slag-blocking weir 5, opening the steel discharge port 7, on one hand, the liquid steel enters the water inlet 2 through the steel discharge port 7 at the bottom of the square slag-blocking weir 8, on the other hand, the liquid steel level in the middle cavity 12 of the tundish and the liquid steel level in the inner cavity 13 of the tundish continue to rise and reach the inner-layer steel passing channel 51 at the same time, and ensuring that the liquid steel levels of the middle cavity 12 of the tundish and the outer cavity 11 of the tundish always; when the liquid steel level of the inner cavity 13 of the tundish reaches the inner layer steel passing channel 51, the stopper rod device 3 is lifted to open the water gap 2; the steel pouring speed is controlled, and molten steel enters the water inlet 2 through the opening 9 and the steel outlet 7 of the square slag weir 8.
When the molten steel in the inner cavity 13 of the tundish faces the opening 9, the stopper device 3 is lowered to block the opening 9, and the molten steel enters the water inlet 2 only through the steel outlet 7 at the bottom of the square slag weir 8.
Claims (1)
1. The application method of the tundish for vacuum ingot casting comprises the steps that the tundish (1) comprises a water gap (2), a stopper rod device (3) arranged at the upper part of the water gap (2) and a steel pouring inlet (4), and is characterized in that: the tundish (1) is cylindrical and comprises two layers of annular slag dams, namely an inner layer slag dam (5) and an outer layer slag dam (6), and the outer layer slag dam (6) and the wall of the tundish (1) form a tundish outer cavity (11); the inner layer slag weir (5) and the outer layer slag weir (6) form a tundish middle cavity (12); an inner cavity (13) of the tundish is formed inside the inner layer slag weir (5); the water gap (2) is positioned in an inner cavity (13) of the tundish; the steel pouring inlet (4) is positioned in the tundish outer cavity (11); the inner layer slag weir (5) and the outer layer slag weir (6) are higher than the molten steel level; a square slag weir (8) is arranged at the upper part of the water gap (2), and an opening (9) is formed in the top of the square slag weir (8) and used for penetrating through the stopper rod device (3); the bottoms of the inner layer slag weir (5), the outer layer slag weir (6) and the square slag weir (8) are provided with steel discharge ports (7), and the bottom surfaces of the steel discharge ports (7) are flush with the bottom surface of the tundish (1); the steel discharge ports (7) of the inner layer slag dam (5) and the outer layer slag dam (6) are correspondingly provided with gates (71), and the gates (71) penetrate through the wall of the slag dam and can be lifted up and down for opening and closing the steel discharge ports (7); the steel pouring inlet (4) comprises a vertical steel pouring channel (41) and a steel draining channel (42) arranged at the bottom of the steel pouring inlet (4), and the steel pouring channel (41) is connected with the steel draining channel (42) in an arc shape; the middle parts of the inner layer slag weir (5) and the outer layer slag weir (6) are respectively provided with a steel passing channel which comprises an inner layer steel passing channel (51) and an outer layer steel passing channel (61), the inner layer steel passing channel (51) is higher than the outer layer steel passing channel (61), and an upward flow field is formed when the molten steel flows from the tundish middle cavity (13) to the tundish inner cavity (12); the opening of crossing the steel passageway in the outside is less than inboard opening, forms ascending flow field when the molten steel stream passes through the steel passageway, its characterized in that: the method comprises the following steps:
The method comprises the following steps: before casting molten steel, a stopper rod device (3) is lowered to block a water gap (2), a gate (71) is lowered to block a steel discharge opening (7); pouring steel, wherein molten steel enters the tundish outer cavity (11) through the steel pouring inlet (4), the steel pouring channel (41) and the steel discharging channel (42), the molten steel gradually rises in the tundish outer cavity (11), and slag is floated upwards through an upward flow field;
step two: when the molten steel level rises to 1/2 of the height below the outer-layer steel passing channel (61), the gate (71) is lifted, the steel discharge port (7) of the outer-layer slag weir (6) is opened, the molten steel enters the tundish middle cavity (12) through the steel discharge port (7) at the bottom of the outer-layer slag weir (6), the molten steel level of the tundish outer cavity (11) rises slowly, the steel casting speed is controlled, the molten steel level in the tundish outer cavity (11) and the molten steel level in the tundish middle cavity (12) reach the outer-layer steel passing channel (61) at the same time, and the molten steel levels of the tundish outer cavity (11) and the tundish middle cavity (12) are ensured to be kept in a rising flow field all the time;
step three: when the molten steel level of the tundish middle cavity (12) reaches 2/3 of the height below the inner-layer steel passing channel (51), the gate (71) of the inner-layer slag-blocking weir (5) is lifted, the steel discharge port (7) of the inner-layer slag-blocking weir (5) is opened, on one hand, the molten steel enters the water inlet (2) through the steel discharge port (7) at the bottom of the square slag-blocking weir (8), on the other hand, the molten steel level in the tundish middle cavity (12) and the molten steel level in the tundish inner cavity (13) continue to rise and simultaneously reach the inner-layer steel passing channel (51), and the molten steel levels of the tundish middle cavity (12) and the tundish outer cavity (11) are ensured to always keep a rising flow field; when the liquid steel level of the inner cavity (13) of the tundish reaches the inner layer steel passing channel (51), the stopper rod device (3) is lifted to open the water gap (2); controlling the steel pouring speed, and leading the molten steel to enter the water inlet (2) through the open hole (9) and the steel discharge port (7) of the square slag weir (8);
step four: when molten steel in an inner cavity (13) of the tundish faces to the opening (9), the stopper device (3) is descended to block the opening (9), and the molten steel enters the water inlet (2) only through the steel discharge port (7) at the bottom of the square slag weir (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810554421.7A CN108380849B (en) | 2018-06-01 | 2018-06-01 | application method of tundish for vacuum ingot casting |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810554421.7A CN108380849B (en) | 2018-06-01 | 2018-06-01 | application method of tundish for vacuum ingot casting |
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| CN108380849A CN108380849A (en) | 2018-08-10 |
| CN108380849B true CN108380849B (en) | 2019-12-13 |
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Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0796144B2 (en) * | 1990-03-16 | 1995-10-18 | 住友金属工業株式会社 | Casting method in horizontal continuous casting |
| DE102006005723A1 (en) * | 2006-02-08 | 2007-08-16 | Purmetall Gmbh & Co. Kg | Injection pot for receiving a flowing out of a casting ladle metallic melt |
| CN201249259Y (en) * | 2008-06-05 | 2009-06-03 | 广州珠江钢铁有限责任公司 | Slab continuous casting tundish |
| CN101774014B (en) * | 2008-12-16 | 2012-07-04 | 中国第一重型机械股份公司 | Tundish with baffle wall for vacuum cast ingot |
| DE102009009740A1 (en) * | 2009-02-19 | 2010-08-26 | Stilkerieg, Berthold, Dipl.-Ing. | Device for vortex avoidance in metallurgical vessels |
| CN103567423A (en) * | 2012-07-28 | 2014-02-12 | 泰州市旺鑫耐火材料有限公司 | Slag stopping wall of tundish |
| CN205437122U (en) * | 2016-03-28 | 2016-08-10 | 马鞍山尚元冶金科技有限公司 | Reduce middle package of IF steel of casting blank inclusion |
| CN206622606U (en) * | 2017-04-18 | 2017-11-10 | 河钢股份有限公司邯郸分公司 | A kind of tundish for reducing continuous casting and pouring surplus steel |
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Effective date of registration: 20191122 Address after: 653100 No. 5 Dongfeng North Road, Hongta District, Yuxi City, Yunnan Province Applicant after: Yunnan Yuxi Yukun Iron and Steel Group Co., Ltd. Address before: 213100 A-101, 16 West Lake Road, Wujin national hi tech Industrial Development Zone, Changzhou, Jiangsu, China, 16 Applicant before: Changzhou Lingfeng super intelligence information Consulting Co., Ltd. |