CN111315502A

CN111315502A - Continuous casting and rolling apparatus and continuous casting and rolling method

Info

Publication number: CN111315502A
Application number: CN201880071807.0A
Authority: CN
Inventors: 郑济淑; 赵庸硕; 孔锺判; 车耿世
Original assignee: Posco Co Ltd
Current assignee: Posco Holdings Inc
Priority date: 2017-11-03
Filing date: 2018-11-02
Publication date: 2020-06-19
Also published as: KR20190050430A; WO2019088771A1; KR101998966B1; JP6845972B2; US20200331045A1; JP2021501056A; EP3705198A1; EP3705198A4; EP3705198B1

Abstract

The continuous casting and rolling apparatus according to an embodiment of the present invention may include: a continuous casting device; a cutting device which is provided at an outlet side of the continuous casting device and cuts the inner cast produced from the continuous casting device; a rolling device that presses down the casting and is provided downstream of the continuous casting device in a moving direction of the inner casting; a tunnel furnace disposed between the cutting device and the rolling device and heating the casting disposed on a main path of the inner casting transferred from the continuous casting device to the rolling device; and a load adjusting unit disposed adjacent to the tunnel furnace, and unloading the castings from the main path from an outlet side of the tunnel furnace and loading the castings onto the main path from an inlet side of the tunnel furnace.

Description

Continuous casting and rolling apparatus and continuous casting and rolling method

Technical Field

The present invention relates to a continuous casting and rolling apparatus and a continuous casting and rolling method.

Background

In the mini-rolling process, the layout is configured to directly roll the cut slab produced by the continuous casting process without cooling.

The tunnel furnace is installed as a space for buffering between the continuous casting device and the rolling device.

The tunnel furnace serves as a space for connecting two continuous casting devices and one rolling device, and as a buffer space in the case where it is necessary to change the rolling mill for a certain period of time. In order to compensate for the temperature drop of the slab when it is left in the space, a heater having a gas heating method or an induction heating method is installed to compensate for the temperature drop.

However, in the small rolling process, the slab produced in the continuous casting apparatus is rapidly transferred to the rolling apparatus for rolling, resulting in a problem that the actual yield is significantly lowered because the slab in the tunnel furnace and the slab newly produced in the continuous casting apparatus are scrapped in case that the rolling apparatus is abnormally operated for a long time. That is, the conventional small-sized rolling process is advantageous in energy because it employs a manner in which a continuous casting device and a rolling device are directly connected to each other according to the flow of material, but has a disadvantage in that it has a poor ability to cope with abnormal operation.

Further, the vehicle exterior material or product required to satisfy the strict surface quality requirements is subjected to a surface cleaning operation after being produced using a cut slab, which eliminates surface defects generated during continuous casting. However, in order to apply the surface cleaning to the small rolling process, it is necessary to install the surface cleaning apparatus on-line in consideration of the characteristics of the small rolling mill, that is, to rapidly transfer the slab produced in the continuous casting apparatus into the rolling apparatus. In this case, it may be disadvantageous that, when the selective surface cleaning of the slab is carried out, the slab which is not surface-cleaned but is in the region in which the surface cleaning device is installed is cooled.

In addition, there may be the following problems: the continuous casting apparatus may not be able to operate in a small rolling process or the rolling capacity of the rolling apparatus may be wasted depending on the slab production speed of the continuous casting apparatus.

Therefore, in order to solve the above problems, studies on continuous casting and rolling equipment and a continuous casting and rolling method are required.

Disclosure of Invention

Technical problem

The purpose of this disclosure is to provide: a continuous casting and rolling apparatus for preventing a problem of a decrease in an actual yield of a slab during an abnormal operation while compensating for a temperature decrease of the slab during the abnormal operation; and a continuous casting and rolling method.

Another object of the present invention is to provide: a continuous casting and rolling facility for surface treating slabs during continuous casting or preventing the problem of wasted rolling device capacity; and a continuous casting and rolling method.

Technical scheme

According to aspects of the present disclosure, a continuous casting and rolling apparatus may include: a continuous casting device; a cutting device that is provided at an outlet side of the continuous casting device and cuts the inner slab produced in the continuous casting device; a rolling device that presses down the slab and is disposed downstream of the continuous casting device in a moving direction of the inner slab; a tunnel furnace which is provided between the cutting device and the rolling device and heats the slab on a main path of the inner slab transferred from the continuous casting device to the rolling device; and a load adjusting unit disposed adjacent to the tunnel furnace to separate the slab on the main path from the tunnel furnace and to guide the slab from an inlet side of the tunnel furnace onto the main path.

The load adjusting unit may include: an extraction device, arranged adjacent to the exit side of the tunnel oven and separating the slabs from the main path to be directed onto the complementary path; and an intake device disposed adjacent to an inlet side of the tunnel furnace and receiving the slab that passes through the supplementary path to be directed onto the main path.

Furthermore, the load adjusting unit may cause the inner slab separated by the extraction device from the main path on the outlet side of the tunnel furnace to be directed onto the main path on the inlet side of the tunnel furnace by the introduction device.

The continuous casting and rolling plant may also comprise a reheating device, which is located on the complementary path between the introduction device and the extraction device and heats the slab on the complementary path.

The continuous casting and rolling plant may also comprise a surface treatment device arranged on the complementary path between the introduction device and the extraction device and heating the slab on the complementary path.

The introduction device may receive at least one of the inner slab produced in the continuous casting device and the outer slab transferred from the outside and guide it onto the main path.

The continuous casting and rolling method may include: a process of supplying an inner slab, which involves cutting the inner slab produced in the continuous casting apparatus and supplying it to a tunnel furnace; a rolling process involving pressing down a slab received from a main path of the slab moving through the tunnel furnace; and a sub-process, which is performed between the internal slab supply process and the rolling process, and involves separating the slab on the main path from the outlet side of the tunnel furnace when the rolling process is stopped, and guiding the slab from the inlet side of the tunnel furnace onto the main path when the rolling process is continued.

The sub-processes may include: an extraction process, which involves separating the slab on the main path from the outlet side of the tunnel furnace when the rolling process is stopped, and an introduction process, which involves receiving the slab separated from the main path on the outlet side of the tunnel furnace and directing it onto the main path on the inlet side of the tunnel furnace while the rolling process continues.

The sub-process may comprise carrying out the introduction process after the extraction process, so as to exclude the intervention of other steps between the extraction process and the introduction process while the slab directed onto the main path is maintained at the temperature for rolling.

The sub-machining process may further comprise a reheating process which is performed before the introduction process and which involves heating the slab directed onto the main path during the sub-machining on the supplementary path when the temperature of the slab is lower than the temperature for rolling.

The sub-processes may further comprise a surface treatment process which is carried out before the introduction process and which involves surface treating the slabs separated from the main path on the outlet side of the tunnel furnace on a supplementary path through which the slabs are conveyed to be directed onto the main path on the inlet side of the tunnel furnace.

The sub-process engineering may further include a process of supplying the outer slabs, which is performed before the introduction process, and which involves guiding the outer slabs produced externally onto a supplementary path through which slabs separated from the main path at the outlet side of the tunnel furnace are transferred to be guided onto the main path at the inlet side of the tunnel furnace.

The process of supplying the outer slab may be performed in the case where the ability of pressing down the slab is greater than the supply amount of the inner slab during the rolling process.

Advantageous effects

The continuous casting and rolling apparatus and the continuous casting and rolling method of the present invention are advantageous in that it is possible to prevent the problem of a reduction in the actual yield of the slab during abnormal operation while compensating for a reduction in the temperature of the slab during abnormal operation.

On the other hand, the continuous casting and rolling equipment and the continuous casting and rolling method are advantageous in that the slab can be surface-treated during continuous casting or the problem that the capacity of the rolling device is wasted can be prevented.

Drawings

Fig. 1 is a layout view showing the moving path of a slab in the continuous casting and rolling facility of the present invention during abnormal operation.

Fig. 2 is a layout view showing a moving path of a slab to compensate for a temperature loss in the continuous casting and rolling facility during abnormal operation.

Fig. 3 is a layout view showing a moving path for surface-treating slabs in a continuous casting and rolling facility.

Fig. 4 is a layout view showing a moving path for receiving an outer slab in a continuous casting and rolling facility.

Fig. 5 is a layout view showing a moving path for receiving an outer plate billet and performing surface treatment in the continuous casting and rolling facility.

Fig. 6 is a flowchart showing the sequence of the continuous casting and rolling method of the present invention.

Fig. 7 is a flowchart showing a sub-process in the continuous casting and rolling method.

Detailed Description

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Meanwhile, the spirit of the present invention is not limited to the suggested embodiments, and a person skilled in the art to which the present invention pertains may easily suggest another embodiment falling within the spirit of the present invention by adding, changing and deleting another element without departing from the spirit of the present invention.

In the following description, components having the same function within the same range shown in the drawings of the embodiments are shown by using the same reference numerals.

The present invention relates to a continuous casting and rolling apparatus and a continuous casting and rolling method. In the present invention, the problem of a decrease in the actual yield of the slab can be prevented, and the surface treatment can be performed on the slab during continuous casting. The problem of wasting the capacity of the rolling device 30 can be prevented.

Specifically, with reference to the accompanying drawings, fig. 1 is a layout diagram showing the movement path of a slab in a continuous casting and rolling plant of the present invention during abnormal operation. Based on fig. 1, a continuous casting and rolling facility according to an exemplary embodiment may include a continuous casting apparatus 10; a cutting device 20, which IS provided at an outlet side of the continuous casting device 10 and cuts the inner slab IS produced in the continuous casting device 10; a rolling device 30 that presses down the slab and IS provided downstream of the continuous casting device 10 in the moving direction of the inner slab IS; a tunnel furnace 40 disposed between the cutting device 20 and the rolling device 30 and heating the slab on the main path MP of the inner slab IS transferred from the continuous casting device 10 to the rolling device 30; and a load adjusting unit 50, the load adjusting unit 50 being disposed adjacent to the tunnel furnace 40 to separate the slab on the main path MP from the tunnel furnace 40 and to guide the slab from an inlet side of the tunnel furnace 40 onto the main path MP.

According to such a configuration, it is possible to prevent a problem that an actual production rate may be lowered due to a defect of the rolling apparatus 30 or scrapping of a slab during abnormal operation in which a rolling operation such as replacement of a conveying roller cannot be performed.

In other words, during abnormal operation, the slab located in the tunnel furnace 40 or the slab generated from the molten steel held in the continuous casting apparatus 10 is separated from the main path MP at the outlet side of the tunnel furnace 40 by the load adjusting unit 50 and is guided onto the replenishment path SP. The slabs on the supplementary path SP are redirected onto the main path MP on the inlet side of the tunnel furnace 40, thereby increasing the time to place the slabs on the moving path.

By obtaining a bypass on which the slab remains without entering the rolling device 30, it is possible to prevent the slab from being wasted due to the insecurity of the path on which the slab is located being discarded.

Furthermore, the load adjusting unit 50 directs the slab directed onto the main path MP onto the inlet side of the tunnel furnace 40, so as to compensate the temperature of the slab that is lowered during its transport through the supplementary path SP, with a temperature that enables rolling.

The continuous casting apparatus 10 may be used to produce the inner slab IS from molten steel through a casting process. That is, the continuous casting apparatus 10 supplies molten steel to a mold in a tundish, and the supplied molten steel forms a casting while dissipating heat. The inner slab IS guided by the segment rolls and the pinch rolls and can be moved and supplied to a rolling device 30 described later.

However, in the continuous casting apparatus 10, the inner cast steel IS manufactured according to the solidification rate of molten steel, and it IS difficult to control the manufacturing rate. Therefore, there IS a speed limit in producing a product by continuously receiving the inner slab IS produced in the continuous casting apparatus 10 and pressing it down using the rolling apparatus 30.

However, the inner slab discharged from the continuous casting apparatus 10 has a high average temperature, which is advantageous in that a temperature required during a rolling operation can be secured.

The cutting device 20 can be used to control whether the slab (inner slab IS or outer slab OS) rolled in the rolling device 30 IS provided in a continuous form connected to the continuous casting device 10 or in a discontinuous form separated from the continuous casting device 10. For this purpose, a cutting device 20 is provided on the outlet side of the continuous casting device 10.

That IS, when the cutting device 20 allows the inner slab IS to freely pass without cutting, the rolling device 30 receives the following inner slab IS to be rolled: the inner slab IS produced in the continuous casting apparatus 10 and IS in a continuous form connected to the continuous casting apparatus 10. When the cutting device 20 cuts the inner slab IS and transfers it to the rolling device 30, the rolling device 30 receives the inner slab IS in a discontinuous form separated from the continuous casting device 10 to be rolled.

When the rolling device 30 IS stopped due to an abnormal operation, the inner slab IS needs to be guided to the replenishing path SP. In this regard, the cutting device 20 cuts the slab.

The rolling apparatus 30 receives a slab such as an inner slab IS produced in the continuous casting apparatus 10 or an outer slab OS supplied from the outside, and presses it to produce a natural product or a later product.

To this end, the rolling device 30 may allow a slab to be rolled through a pair of rolls, and several rolling stands providing such a pair of rolls may be provided.

As described above, the rolling apparatus 30 can roll a slab while setting various rolling thicknesses.

The rolling device 30 may be provided as a rough rolling device 30 and a finish rolling device 30. The rough rolling device 30 has a configuration in which a slab produced in the continuous casting device 10 is rolled first, and the finish rolling device 30 has a configuration in which the slab rolled in the rough rolling device 30 is finish rolled.

In the case where the rough rolling device 30 satisfies the rolling thickness of the slab, the finish rolling device 30 does not perform rolling but allows the paired rolling rolls to freely pass the slab. Alternatively, when the rolled thickness of the slab is formed only by the operation of the finish rolling apparatus 30, the rough rolling apparatus 30 does not perform rolling but may allow the pair of rolling rolls to freely pass the slab.

A heater for adjusting the rolling temperature of the slab or a scale remover for removing scale may be provided on the inlet side of the rough rolling apparatus 30 or the finish rolling apparatus 30.

The tunnel furnace 40 is used to maintain or increase the rolling temperature of the slab when the slab is transferred to the rolling apparatus 30 and rolled.

For this, the tunnel furnace 40 IS disposed between the continuous casting apparatus 10 and the rolling apparatus 30 and heats a slab such as an inner slab IS produced in the continuous casting apparatus 10 or an outer slab OS provided from the outside, thereby maintaining or increasing the rolling temperature of the slab.

On the other hand, since the cooling rate can be adjusted as the temperature of the slab increases or the heating amount decreases, the material of the slab can also be adjusted.

For this, the tunnel furnace 40 may be provided with a heating device using, for example, a gas heating method, an induction heating method, or the like, and a plurality of tunnel furnaces 40 may be provided according to the length thereof.

In particular, the slab IS split at the outlet side of the tunnel furnace 40 from a main path MP of the inner slab IS, which conveys the inner slab IS from the continuous casting device 10 to the rolling device 30, to a supplementary path SP. Meanwhile, a load adjusting unit 50 guiding the slab from the supplementary path SP to the main path MP may be connected to an inlet side of the tunnel furnace 40.

The load adjusting means 50 is used to separate the slab from the main path MP and introduce the slab into the supplementary path SP on the exit side of the tunnel furnace 40, and separate the slab from the supplementary path SP onto the main path MP on the entrance side of the tunnel furnace 40. This is to prevent the problem of slab scrapping and a reduction in the actual yield thereof due to the presence of a defective or scrapped slab in the rolling device 30 during abnormal operation of the rolling operation such as replacement of the conveying rollers by extending the path on which the slab remains to the replenishment path SP. This enables the slab to remain on the main path MP and the supplementary path SP without being discarded until normal operation is resumed.

To this end, the load adjusting means may comprise an extraction means 51 and an introduction means 52. That is, the load adjusting unit 50 of the continuous casting apparatus according to the exemplary embodiment of the present invention is disposed adjacent to the exit side of the tunnel furnace 40 and adjacent to the entrance side of the tunnel furnace 40, and the drawing device 51 separates the slab from the main path MP to be guided onto the supplementary path SP. The load-adjusting unit 50 may include an intake device 52, which intake device 52 receives slabs that pass through the supplemental path SP to be directed onto the main path MP.

The extraction device 51, located on the exit side of the tunnel oven 40, is used to transfer the slabs from the main path MP to the supplementary path SP. Therefore, the moving path of the slab is expanded by changing the moving path of the slab from the exit side of the tunnel furnace 40 toward the rolling device 30 to the replenishing path SP.

Such extraction means 51 may comprise a pusher which pushes the slabs on the conveyor rollers, but are not limited thereto. Any extraction device 51 can be used in the present invention, as long as it is able to transfer the slabs from the main path MP to the complementary path SP.

An intake device 52 located on the inlet side of the tunnel oven 40 is used to transfer the slabs from the supplementary path SP to the main path MP. Therefore, the slab separated from the exit side of the tunnel furnace 40 can be conveyed toward the rolling apparatus 30.

Further, since the introduction device 52 is provided at the inlet side of the tunnel furnace 40, the introduction device 52 can heat the slab to raise the temperature of the slab, which is lowered when being transferred to the replenishing path SP, to a temperature at which the slab can be rolled.

Similar to the extraction device, the introduction device 52 may comprise a pusher that pushes the slabs on the conveyor rollers, but is not limited thereto. Any intake device 52 can be used in the present invention, as long as it is able to transfer the slabs from the complementary path SP to the main path MP.

The load adjusting unit 50 of the continuous casting apparatus according to the exemplary embodiment may be used to guide the inner slab IS separated from the main path MP at the outlet side of the tunnel furnace 40 by the drawing device 51 onto the main path MP at the inlet side of the tunnel furnace 40 by the introduction device 52.

That is, no additional configuration is proposed for the movement path of the slab transferred from the extraction device 51 to the introduction device 52, and the slab may be configured to be transferred while forming the complementary path SP that connects the introduction device 52 directly to the extraction device 51.

When the supplementary path SP is formed as described above, the length thereof may be reduced according to the number of slabs to be retained.

The length of the supplementary path SP is defined in consideration of the amount of the slab cooled on the supplementary path SP. That is, the temperature of the slab on the inlet side of the rolling device 30 needs to be higher than the temperature at which rolling can be performed, in consideration of the amount by which the cooled slab is reduced on the replenishing path SP and the extent to which the temperature increased in the tunnel furnace 40 is added to the slab. In this relation, the maximum distance of the complementary path SP is defined.

Fig. 2 is a layout view showing a moving path of a slab compensating for a temperature loss in the continuous casting and rolling facility during abnormal operation. Based on this, the continuous casting apparatus according to the exemplary embodiment is disposed on the supplementary path SP between the withdrawing device 51 and the introducing device 52, and may include a reheater 60 heating the slab on the supplementary path SP.

The reheater 60 is further provided on the supplementary path SP as described above because the amount of increase of the slab remaining on the supplementary path SP exceeds the range of compensating for the temperature decrease (cooling amount) of the slab remaining on the path of the tunnel furnace 40 as necessary.

In this case, the inner slab IS produced in the continuous casting apparatus 10 IS prevented from being discarded in the case of a long abnormal operation, and the amount of the inner slab IS remaining on the main path MP or the supplementary path SP IS increased.

Such a reheater 60 may be configured as a tunnel furnace 40. That is, the reheater 60 may be provided with a heating means such as a gas heating method, an induction heating method, or the like, and a plurality of reheaters 60 may be provided according to the length of the heated section.

Fig. 3 is a layout view showing a moving path for surface-treating slabs in a continuous casting and rolling facility. Based on this, the continuous casting apparatus according to the exemplary embodiment may include a surface treatment device 70 that is disposed between the introduction device 52 and the extraction device 51 on the replenishment path SP and performs surface treatment on the slab on the replenishment path SP.

The surface treatment device 70 IS used to perform a surface treatment on the inner slab IS or the outer slab OS according to the needs of the product to be produced.

As an example, since the surface treatment device 70 is provided on the supplementary path SP instead of the main path MP, the slab that does not require the surface treatment is prevented from being unnecessarily cooled due to unnecessary waste of the main path MP. Furthermore, for slabs that require a surface treatment, selective surface treatment is possible.

Fig. 4 is a layout view showing a moving path for receiving an outer slab in the continuous casting and rolling facility, and fig. 5 is a layout view showing a moving path for receiving an outer slab and performing surface treatment in the continuous casting and rolling facility.

Based on fig. 4 and 5, the introduction device 52 of the continuous casting device according to the exemplary embodiment IS configured to receive at least one of the inner slab IS produced in the continuous casting device 10 or the outer slab OP transferred from the outside to guide it onto the main path MP.

That IS, the introduction device 52 IS not limited to supplying the inner slab IS produced in the continuous casting device 10 to the rolling device 30 and rolling it; the introduction device 52 is configured to introduce the externally produced slab, thereby preventing the rolling capacity of the rolling device 30 from being wasted. This can be used to increase the yield of the product produced by the rolling apparatus 30.

Furthermore, in view of the rolling capacity of the rolling device 30, a plurality of continuous casting devices 10 may be connected to a single rolling device 30 to form the main path MP. On the other hand, the moving path of the slab connecting the main continuous casting device 10 and the rolling device 30 is formed as a main path MP, and the slab produced in the other continuous casting device 10 is transferred to the rolling device through a supplementary path SP.

When the outer slab OS needs to be surface-treated, a moving path through the surface treatment device 70 may be constructed. When additional heating is required, a travel path through the reheater 60 may be constructed.

Fig. 6 is a flowchart showing the sequence of the continuous casting and rolling method of the present invention. Based on this, a continuous casting and rolling method according to another exemplary embodiment involves: a process of supplying an inner slab, which involves cutting the inner slab produced in the continuous casting apparatus 10 and supplying it to the tunnel furnace 40; a rolling process involving the pressing down of the slab received from the main path MP of the slab through the tunnel oven 40; and a sub-process, which is performed between the inner slab supply process and the rolling process, which involves separating the slab on the main path MP from the outlet side of the tunnel furnace 40 when the rolling process is stopped, and guiding the slab from the inlet side of the tunnel furnace onto the main path MP while the rolling process is continued.

This sub-process can be used to prevent the problem of a reduction in the actual yield, which may be caused by a defect in the rolling device 30 or a scrapped slab during abnormal operation in which a rolling operation such as replacement of a transfer roll cannot be performed.

That is, during the abnormal operation, the slab located in the tunnel furnace 40 or the slab generated from the molten steel held in the continuous casting apparatus 10 is separated from the main path MP at the outlet side of the tunnel furnace 40 to be guided onto the replenishment path SP. Alternatively, the slabs on the supplementary path SP are directed onto the main path MP at the inlet side of the tunnel oven 40, thereby increasing the time for placing the slabs on the moving path.

By ensuring that the slab remains on it without entering the bypass of the rolling device 30, it is possible to prevent the slab from being wasted by being discarded due to the insecurity of the path holding the slab.

Furthermore, the slab directed onto the main path MP is limited to being directed onto the inlet side of the tunnel furnace 40, so as to compensate the temperature of the slab that decreases during its transit through the supplementary path SP, with a temperature that enables rolling.

The process of supplying the inner slab involves producing the inner slab IS using molten steel in the continuous casting device 10, and the rolling process involves pressing down the slab by the rolling device 30 to produce a rolled product.

As described above, the sub-machining process involves the creation of the supplementary path SP, through which the inner slab IS conveyed to the continuous casting device 10 and the rolling device 30, in addition to the main path, so that the problem of the slab being discarded during abnormal operation IS prevented.

More specifically, the sub-processes of the continuous casting and rolling method according to another exemplary embodiment may include: a drawing-out process involving separating the slab on the main path from the outlet side of the tunnel furnace when the rolling process is stopped; and an introduction process involving receiving the slab separated from the main path on the outlet side of the tunnel furnace and directing it onto the main path on the inlet side of the tunnel furnace when the rolling process is resumed.

That is, an extraction process involving the transfer of slabs from the main path MP to the complementary path SP and an introduction process transferring slabs from the complementary path SP to the main path MP are proposed.

When the extraction process and the introduction process are performed, no other process is allowed to intervene therebetween, so that no additional process can be performed on the complementary path SP, and this helps to configure the slab held on the path.

That is, the sub-process of the continuous casting and rolling method according to another exemplary embodiment includes performing the introduction process after the withdrawal process, so that when the slab guided onto the main path maintains at least the temperature for rolling, the intervention of other steps therebetween is excluded.

The sub-processing treatment was performed under the following conditions: wherein the time of the abnormal operation is short enough to supplement the cooling amount in the tunnel furnace 40 although the slab remains on the supplement path SP.

However, in the case of the long-time abnormal operation, the cooling amount of the slab remaining on the supplementary path SP increases, so that the rolling temperature cannot be secured. In this case, the slab is reheated between the introduction and extraction processes.

That is, the sub-processes of the continuous casting and rolling method according to another exemplary embodiment may include a reheating process performed before the introduction process, the reheating process involving: in the case where the temperature of the slab is lower than the rolling temperature, the slab introduced onto the main path MP during the sub-process is heated on the supplementary path SP.

The reheating process may be performed in the reheater 60 provided on the supplement path SP.

Further, the sub-processes of the continuous casting and rolling method according to another exemplary embodiment may include a surface treatment process performed before the introduction process, the surface treatment process involving surface treatment of the slab separated from the main path MP at the outlet side of the tunnel furnace 40 on the supplementary path SP through which the slab piece is transferred to be guided onto the main path MP at the inlet side of the tunnel furnace 40.

In the case of producing exterior materials for vehicles or products that need to meet strict surface quality requirements, a surface treatment process may be performed.

For this reason, the surface treatment process is performed in the surface treatment device 70 provided on the replenishment path SP. This can prevent the problem of the main path MP being lengthened by the surface treatment device 70 and the problem of the slab on the main path MP being cooled.

Further, the sub-process of the continuous casting and rolling method according to another exemplary embodiment may include a process of supplying an outer slab, which is performed before the introduction process and involves introducing an externally produced outer slab OS onto a supplementary path SP through which a slab separated from the main path MP at the outlet side of the tunnel furnace 40 is transferred and introduced onto the main path MP at the inlet side of the tunnel furnace 40.

That IS, the sub-process IS not limited to providing the inner slab IS during the inner slab supply process, and also includes supplying the outer slab OS introduced from the outside.

The supply process of supplying the outer slab is further performed to prevent the problem of wasting the capacity of the rolling device 30.

That IS, when the ability to press a slab during rolling IS greater than the amount of the supplied inner slab IS, the outer slab supply process of the continuous casting and rolling method according to another exemplary embodiment IS performed.

While embodiments have been shown and described in detail above, it will be apparent to those skilled in the art that modifications and variations can be made without departing from the scope of the disclosure as defined by the appended claims.

Claims

1. A continuous casting and rolling apparatus comprising:

a continuous casting device;

a cutting device that is provided at an outlet side of the continuous casting device and cuts an inner slab produced in the continuous casting device;

a rolling device that presses down a slab and is disposed downstream of the continuous casting device in a moving direction of the inner slab;

a tunnel furnace disposed between the cutting device and the rolling device and heating a slab located on a main path of the inner slab transferred from the continuous casting device to the rolling device; and

a load adjusting unit disposed adjacent to the tunnel furnace to separate the slabs on the main path from the tunnel furnace and direct the slabs onto the main path from an entrance side of the tunnel furnace.

2. The continuous casting and rolling facility of claim 1 wherein the load adjustment unit comprises:

an extraction device disposed adjacent to an exit side of the tunnel oven and separating the slab from the main path to be directed onto a complementary path; and

an intake device disposed adjacent to an inlet side of the tunnel furnace and receiving the slab through the supplemental path to be directed onto the main path.

3. The continuous casting and rolling facility of claim 2 wherein the load leveling unit is configured to direct the inner plate billet separated by the extraction device from the main path on the exit side of the tunnel furnace onto the main path on the entry side of the tunnel furnace by the introduction device.

4. Continuous casting and rolling plant according to claim 2, wherein the plant comprises reheating means located between the introduction means and the extraction means on the complementary path and which heat the slab on the complementary path.

5. Continuous casting and rolling plant according to claim 2, wherein the plant comprises a surface treatment device arranged on the complementary path between the introduction device and the extraction device and which heats the slab on the complementary path.

6. The continuous casting and rolling facility of claim 2 wherein the introducing means is configured to receive and direct onto the main path at least one of an inner slab produced in the continuous casting device and an outer slab delivered from the outside.

7. A continuous casting and rolling method comprising:

a process of feeding an inner slab, which involves cutting the inner slab produced in the continuous casting apparatus and supplying the inner slab to a tunnel furnace;

a rolling process involving pressing down a slab received from a main path of the slab moving through the tunnel furnace; and

a sub-process that is performed between the process of supplying the inner slab and the rolling process, and involves separating the slab on the main path from an outlet side of the tunnel furnace when the rolling process is stopped, and guiding the slab from the inlet side of the tunnel furnace onto the main path when the rolling process is continued.

8. The continuous casting and rolling method of claim 7, wherein the sub-process comprises:

an extraction process involving separating the slab on the main path from the exit side of the tunnel furnace when the rolling process is stopped; and

an introduction process involving receiving the slab separated from the main path on the exit side of the tunnel furnace while the rolling process continues and directing the slab onto the main path on the entry side of the tunnel furnace.

9. The continuous casting and rolling method according to claim 8, wherein the sub-process comprises performing the introduction process after the extraction process to exclude intervention of other steps between the extraction process and the introduction process while the slab directed onto the main path is maintained at a temperature for rolling.

10. The continuous casting and rolling method according to claim 8, wherein the sub-process further includes reheating, the reheating being performed before the introduction process, and the reheating involves heating the slab directed onto the main path during the sub-process on a supplementary path when the temperature of the slab is lower than a temperature for rolling.

11. The continuous casting and rolling method according to claim 8, wherein the sub-process further includes a surface treatment process that is performed before the introduction process, and the surface treatment process involves surface-treating the slab separated from the main path at the outlet side of the tunnel furnace on a supplementary path through which the slab is conveyed to be guided onto the main path at the inlet side of the tunnel furnace.

12. The continuous casting and rolling method of claim 8, wherein the sub-process engineering further comprises: a process of supplying outer slabs, which is performed before the introduction process, and which involves guiding outer slabs produced externally onto the supplementary path through which the slabs separated from the main path at the outlet side of the tunnel furnace are transferred to be guided onto the main path at the inlet side of the tunnel furnace.

13. The continuous casting and rolling method according to claim 12, wherein the process of supplying the outer slab is performed in a case where a capability of pressing down the slab during the rolling process is greater than a supply amount of the inner slab.