CN213614014U - Closed vertical pouring system with precooling function - Google Patents
Closed vertical pouring system with precooling function Download PDFInfo
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- CN213614014U CN213614014U CN202022628652.3U CN202022628652U CN213614014U CN 213614014 U CN213614014 U CN 213614014U CN 202022628652 U CN202022628652 U CN 202022628652U CN 213614014 U CN213614014 U CN 213614014U
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Abstract
The utility model relates to a closed vertical gating system with precooling function belongs to the cast rolling former field. The device comprises a casting roller, a side sealing mechanism, a pouring channel and a precooling vertical plate; the pre-cooling vertical plates are arranged on two sides of a rolling center line, and water cooling channels are arranged in the pre-cooling vertical plates; the precooling vertical plate, a pouring channel positioned above the precooling vertical plate and side sealing mechanisms positioned at two ends of the precooling vertical plate are combined to form a closed channel; the casting roller, the side sealing mechanism and the precooling vertical plate jointly form a molten pool. Solves the problems that the molten aluminum is easy to oxidize, the liquid level of a molten pool is easy to fluctuate, the heat transfer efficiency is low, the product quality is unstable, segregation is easy to generate and the like in the process of producing the thin strip by casting and rolling the aluminum alloy.
Description
Technical Field
The utility model belongs to cast the former field of rolling, concretely relates to closed vertical gating system with precooling function.
Background
In the continuous casting and rolling forming of aluminum alloy, aluminum liquid is directly poured between a pair of rotating casting rollers, and an aluminum alloy molten pool is formed between a casting nozzle plate, a side sealing mechanism and the two casting rollers. The heat of the molten aluminum in the molten pool is transferred into the circulating cooling water passing through the roller sleeve, the heat is taken away by the cooling water, the solidification of the molten aluminum is realized, and a thin strip is formed under the rolling action of the rotating casting roller.
In the production process of casting and rolling aluminum alloy, aluminum liquid refined and degassed in a standing furnace is temporarily stored in a front liquid box through a chute, and is distributed into roll gaps from the front liquid box through a casting nozzle plate, and is solidified and rolled and formed. In the casting process, the chute and the front liquid box are directly contacted with air, so that the probability of aluminum liquid oxidation is increased, and particularly, in the casting and rolling process of the aluminum alloy thin strip, inert gas is generally needed for protection; meanwhile, the runner, the front liquid tank and the casting nozzle are independent mechanisms, the front liquid tank is close to a molten pool, the molten pool is small and shallow, and the fluctuation of the liquid level of the front liquid tank easily causes the instability of production, so that the defects of poor surface quality, unstable plate thickness and the like are caused; moreover, in the existing production mode, the heat of the molten pool of the aluminum liquid is taken away by cooling water in the casting roller, the heat transmission efficiency is low, and the production efficiency is low.
SUMMERY OF THE UTILITY MODEL
In view of this, an object of the present invention is to provide a closed vertical gating system with a pre-cooling function, so as to solve the problems of easy oxidation of molten aluminum, easy fluctuation of molten pool liquid level, low heat transfer efficiency, unstable product quality, easy segregation and the like in the process of producing thin strips by casting and rolling aluminum alloy.
In order to achieve the above purpose, the utility model provides a following technical scheme:
a closed vertical pouring system with a pre-cooling function comprises a casting roller, a side sealing mechanism, a pouring channel and a pre-cooling vertical plate; the pre-cooling vertical plates are arranged on two sides of a rolling center line, and water cooling channels are arranged in the pre-cooling vertical plates; the precooling vertical plate, a pouring channel positioned above the precooling vertical plate and side sealing mechanisms positioned at two ends of the precooling vertical plate are combined to form a closed channel; the casting roller, the side sealing mechanism and the precooling vertical plate jointly form a molten pool.
Furthermore, the two pre-cooling vertical plates are symmetrically arranged on two sides of a rolling central line along the axial direction of the casting roller, the lower edges of the two pre-cooling vertical plates are close to and do not contact with the roller surface of the casting roller, and the lower edges of the pre-cooling vertical plates positioned on the end surface side of the casting roller are butted with the upper edge of the side sealing mechanism.
Further, the upper end of the precooling vertical plate is sealed by an inclined plate.
Further, water and be ceramic conduit, the front end of watering directly links to each other with preceding liquid tank, and the lower extreme of watering is connected with the swash plate of precooling riser upper end.
Furthermore, a thermometer is also included, and the thermometer extends into the molten pool.
Further, still include the cloth stream ware, the cloth stream ware sets up the inside at the molten bath.
The beneficial effects of the utility model reside in that:
1. the system isolates air, solves the problem of oxidation generated in the casting process during the casting and rolling production of the aluminum alloy, replaces the gas protection during the casting and rolling of the existing aluminum alloy thin strip, and saves energy.
2. The inclined plate on the top of the precooling vertical plate enables gas in a molten pool to be easily discharged, so that dead zones are avoided, molten aluminum in a casting and rolling zone is purer, less impurities are contained, the gas content is low, and the mechanical property of produced plates can be further improved.
3. The precooling vertical plate can reduce the input heat of a molten pool, so that the aluminum alloy is in a semi-solidification state in a casting and rolling area, the casting and rolling heat transfer efficiency is further improved, the production efficiency is improved, the internal structure of the produced plate is better, the product performance is better, and the casting and rolling speed of the conventional casting and rolling aluminum alloy is greatly improved. Especially for the alloy with a large solidification interval, the system can transfer and take away 0-30% of the heat of the melt through the precooling plate, and the alloy variety produced by casting and rolling is expanded.
4. The pouring system is matched with a vertical casting and rolling machine for use, realizes the symmetric control of casting structure, prevents the problems of gravity segregation and the like when alloy plates are produced in the modes of horizontal casting and rolling, inclined casting and rolling and the like, and provides possibility for producing high-quality alloy plates.
5. This gating system adopts the high flux high static pressure molten bath, and the fluctuation that the aluminium liquid got into molten bath upper portion can not arouse the casting and rolling district, and the casting and rolling district is very stable, can effectually avoid the liquid level fluctuation of traditional handicraft aluminium liquid in the pouring process, and the production process is more stable high-efficient, and the slab band thickness of producing is more homogeneous, and surface quality is more stable.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and/or combinations particularly pointed out in the appended claims.
Drawings
For the purposes of promoting a better understanding of the objects, features and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:
fig. 1 is a schematic view of the overall structure of the present invention;
fig. 2 is a perspective view of the present invention.
Reference numerals:
the device comprises a pouring channel 1, a flow distributor 2, a precooling vertical plate 3, a side sealing mechanism 4, a casting roller 5, a water cooling channel 6 and a thermometer 7; a swash plate 301.
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein. The present invention can also be implemented or applied through other different specific embodiments, and various details in the present specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention, and the features in the following embodiments and examples may be combined with each other without conflict.
Wherein the showings are for the purpose of illustrating the invention only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in any way limiting the scope of the invention; for a better understanding of the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", "front", "back", etc., indicating directions or positional relationships based on the directions or positional relationships shown in the drawings, it is only for convenience of description and simplification of description, but it is not intended to indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore, the terms describing the positional relationships in the drawings are only used for illustrative purposes and are not to be construed as limiting the present invention, and those skilled in the art can understand the specific meanings of the terms according to specific situations.
Referring to fig. 1 to 2, a closed vertical casting system with a pre-cooling function includes a casting roll 5, a side sealing mechanism 4, a runner 1 and a pre-cooling vertical plate 3; wherein the pre-cooling vertical plate 3 is arranged at two sides of a rolling central line, and a water cooling channel 6 is arranged in the pre-cooling vertical plate 3; the precooling vertical plate 3, the pouring channel 1 positioned above the precooling vertical plate and the side sealing mechanisms 4 positioned at two ends of the precooling vertical plate are combined to form a closed channel; the casting roller 5, the side sealing mechanism 4 and the precooling vertical plate 3 jointly form a molten pool.
Specifically, in the scheme, the two pre-cooling vertical plates 3 are symmetrically arranged on two sides of a rolling center line along the axis direction of the casting roller 5, the lower edges of the two pre-cooling vertical plates 3 are close to and do not contact with the roller surface of the casting roller 5, and the lower edges of the pre-cooling vertical plates 3 located on the end surface side of the casting roller 5 are butted with the upper edge of the side sealing mechanism 4. The pouring gate 1, the precooling vertical plate 3 and the side sealing mechanism 4 in the system are fixed into a whole to form a closed channel, the pouring process is completed in the totally closed oxygen insulation channel, air is isolated, the oxidation of aluminum liquid is avoided, and the performance of the produced product is better. The water cooling channels 6 are arranged in the pre-cooling vertical plates 3 on two sides of the rolling center line to form vertical plates with pre-cooling functions, 0-30% of heat of a molten pool is taken away through heat transfer of the pre-cooling plates, so that the molten pool in front of a roll gap is in a semi-solid state, the casting and rolling speed is higher, and the surface quality of a produced product is better.
The scheme is further optimized, and the upper end of the precooling vertical plate 3 is sealed by an inclined plate 301. The gas in the molten pool is easy to discharge, the dead zone is avoided, and further the aluminum liquid is more pure, the impurities are less, and the gas content is low.
Preferably, a thermometer 7 is also included, and the thermometer 7 extends into the molten bath. The thermometer 7 can monitor the temperature of the molten pool in real time so as to be convenient for the control system to adjust, thus more accurately controlling the temperature of the aluminum liquid in the molten pool and realizing stable production.
The closed vertical pouring system also comprises a flow distributor 2, and the flow distributor 2 is arranged in the molten pool. The closed vertical pouring system is vertical, realizes symmetrical pouring, can prevent the problems of gravity segregation and the like when alloy plates are produced in the modes of horizontal casting and rolling, inclined casting and rolling and the like, and provides possibility for producing high-quality alloy plates. The system can realize the high-speed casting and rolling of 1-series, 3-series, 5-series and 8-series aluminum alloy thin strips, and is also suitable for casting difficult-to-cast aluminum alloys with wide solidification intervals and high alloy elements because of the improvement of cooling efficiency.
During casting and rolling, the precooling vertical plate 3 is cooled to meet the following conditions:
in the formula: q1 is the total heat input by the aluminum liquid, and the unit is J/s;
q2 is the total heat output by the aluminum liquid, and the unit is J/s;
Qinput deviceThe unit is J/s for the heat input by the aluminum liquid;
Qlatent heatThe unit is the latent heat of the aluminum liquid, and the unit is J/s;
QprecoolingThe unit of the heat taken away by the precooling vertical plate is J/s;
Qroll surfaceThe heat quantity taken away by the roller surface is J/s;
Qaluminium plateThe heat quantity taken away by the aluminum plate is expressed in J/s;
m is mass flow, and the unit is kg/s;
h is the thickness of the aluminum plate and is in m;
l is the width of the aluminum plate and is in m;
v is the speed of the aluminum plate in m/s;
rho is the density of the aluminum liquid and the unit is kg/m3；
c1The specific heat of the aluminum liquid is expressed by J/(kg.K);
t1the temperature of the aluminum liquid is expressed as K;
q is the latent heat of the aluminum liquid, and the unit is J/kg;
λ is heat transfer coefficient and has the unit of W/(m)2·K)；
n is the pre-cooled solid fraction;
gamma is the interface heat exchange coefficient;
t2is the interface temperature difference, in units of K;
a is the heat exchange area of the aluminum plate and the unit is m2；
c2The specific heat of the aluminum plate is expressed in J/(kg. K);
t3is the temperature of the aluminum plate in K.
The casting roller 5, the side sealing mechanism 4 and the precooling vertical plate 3 jointly form a high-flux high-static-pressure molten pool, the aluminum alloy melt of the front liquid box firstly enters the upper part of the molten pool from the pouring channel 1, the liquid level at the bottom is stable, and the stable casting under the high static pressure is realized.
The flow distributor 2 is positioned in the molten pool, so that the problem of poor surface quality caused by the fluctuation of the liquid level of the molten pool is avoided.
When the casting device is used specifically, the position of a casting system is adjusted, a control valve of a front-end standing furnace (not shown) is opened, aluminum liquid directly flows into a closed pouring channel 1 from the standing furnace, flows through a flow distributor 2 through a guide hole in the middle of the tail end of the pouring channel 1, holes are uniformly distributed on the flow distributor 2, the aluminum liquid can uniformly enter between two casting rollers 5, and the heat of the aluminum liquid is mainly taken away by a precooling vertical plate 3 and the casting rollers 5 and is formed by rolling the casting rollers 5. The precooling vertical plate 3, the side sealing mechanism 4 and the casting roller 5 jointly form a molten pool, and the temperature of aluminum liquid in the molten pool can be monitored in real time by a thermometer 7; the molten pool is a high static pressure molten pool, the flow distribution pipe is below the liquid level, and the fluctuation of the molten pool is small; the pre-cooling vertical plate 3 takes away the heat of the pre-cooling vertical plate through the water cooling channel 6 to adjust the temperature of the aluminum liquid in the molten pool.
The system is not only suitable for casting and rolling production of conventional cast and rolled aluminum alloy, but also suitable for casting and rolling aluminum alloy with a large solidification interval, and calculation and explanation are carried out by taking aluminum alloy 5182 as an example and combining relevant parameters of a used casting and rolling machine.
TABLE 1.5182 aluminum alloy base parameters
TABLE 2.5182 calculation table of casting and rolling parameters of aluminium alloy
On the basis of a novel vertical casting and rolling machine, the closed vertical pouring system with the precooling function is utilized, and the casting and rolling speed of 5182 aluminum alloy can be improved to more than 25m/min from 4m/min by controlling the precooling effect.
Finally, the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the scope of the claims of the present invention.
Claims (6)
1. The utility model provides a closed vertical gating system with precooling function, includes casting roll and side seal mechanism, its characterized in that: the device also comprises a pouring channel and a precooling vertical plate; the pre-cooling vertical plates are arranged on two sides of a rolling center line, and water cooling channels are arranged in the pre-cooling vertical plates; the precooling vertical plate, a pouring channel positioned above the precooling vertical plate and side sealing mechanisms positioned at two ends of the precooling vertical plate are combined to form a closed channel; the casting roller, the side sealing mechanism and the precooling vertical plate jointly form a molten pool.
2. The closed vertical gating system with pre-cooling as defined in claim 1, wherein: the two pre-cooling vertical plates are symmetrically arranged on two sides of a rolling central line along the axial direction of the casting roller, the lower edges of the two pre-cooling vertical plates are close to and do not contact with the roller surface of the casting roller, and the lower edges of the pre-cooling vertical plates positioned on the end surface side of the casting roller are butted with the upper edge of the side sealing mechanism.
3. The closed vertical gating system with pre-cooling function as claimed in claim 1 or 2, wherein: the upper end of the precooling vertical plate is sealed by an inclined plate.
4. The closed vertical gating system with pre-cooling as defined in claim 3, wherein: the runner is a ceramic pipeline, the front end of the runner is directly connected with the front liquid tank, and the lower end of the runner is connected with the inclined plate at the upper end of the precooling vertical plate.
5. The closed vertical gating system with pre-cooling as defined in claim 1, wherein: the melting furnace also comprises a thermometer, and the thermometer extends into the melting tank.
6. The closed vertical gating system with pre-cooling as defined in claim 1, wherein: the device also comprises a flow distributor which is arranged in the molten pool.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022628652.3U CN213614014U (en) | 2020-11-13 | 2020-11-13 | Closed vertical pouring system with precooling function |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022628652.3U CN213614014U (en) | 2020-11-13 | 2020-11-13 | Closed vertical pouring system with precooling function |
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| CN213614014U true CN213614014U (en) | 2021-07-06 |
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| CN202022628652.3U Active CN213614014U (en) | 2020-11-13 | 2020-11-13 | Closed vertical pouring system with precooling function |
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