JP6845972B2 - Continuous casting and rolling equipment and continuous casting and rolling method - Google Patents

Description

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

In the minimill process, the layout is configured so that the cut slabs produced through the continuous casting process can be rolled without cooling.

A tunnel furnace is installed between the continuous casting machine and the rolling machine as a space that acts as a buffer.

This tunnel furnace also functions as a space for connecting two continuous casting machines and one rolling mill. It is also used as a buffer space when a certain amount of time is required due to replacement of rolling mill rolls or the like. In addition, in order to compensate for the temperature drop while the slab or the like stays in the space, a heater such as a gas heating method or an induction heating method is installed to compensate for the falling temperature.

However, in the mini mill process, the slabs produced by continuous casting are immediately transferred to the rolling mill and rolled, so when an abnormal operating condition occurs for a long time in the rolling mill, the scraps in the tunnel furnace are newly replaced with the shards. There is a problem that all the slabs produced by the continuous casting machine are processed as scrap and the actual yield is significantly reduced. In other words, the conventional mini mill process has an advantage in terms of energy because the continuous casting machine and the rolling mill are directly connected along the flow of the material, but the disadvantage is that it does not reach the capacity to cope with abnormal operating conditions. There is.

In addition, automobile skins and products that require an excellent surface are manufactured as slabs made by cutting slabs, and then subjected to a scalping process. Through this process, surface defects generated in the continuous casting process are removed. However, in order to apply the smelting method in the mini mill process, the smelting machine is online (on-line) due to the characteristics of the mini mill process in which the slabs produced by the continuous casting machine are directly transferred to the rolling mill. Need to be installed. In this case, when performing the smelting work on the selective slab, the slab that does not need to be smelted has a drawback that the slab is cooled by the installation area of the smelter.

Further, in the mini mill process, there may be a problem that the continuous casting machine is not operated or the rolling capacity of the rolling mill is wasted depending on the speed of slab production of the continuous casting machine.

Therefore, a continuous casting and rolling apparatus and a continuous casting and rolling method for solving the above-mentioned problems are required.

An object of the present invention is to provide a continuous casting and rolling apparatus and a continuous casting and rolling method that can supplement the temperature drop of a slab during abnormal operation and prevent the problem that the actual yield of the slab is lowered.

Another object is to provide a continuous casting and rolling apparatus and a continuous casting and rolling method that can prevent the problem of laminating slabs in a continuous casting process or wasting the capacity of a rolling mill. ..

The continuous casting and rolling apparatus according to the present invention is located on the outlet side of the continuous casting machine, a cutting machine for cutting the internal slab manufactured by the continuous casting machine, and the slabs are rolled down. The internal casting provided between a rolling mill provided downstream of the continuous casting machine in the moving direction of the internal slab and the cutting machine and the rolling mill, and conveyed from the continuous casting machine to the rolling mill. A tunnel furnace that heats the slabs located on the main path of one piece, and a tunnel furnace that is provided adjacent to the tunnel furnace and separates the slabs on the main path from the exit side of the tunnel furnace and enters the tunnel furnace. It is characterized by including a load adjusting unit for pulling slabs onto the main path.

Here, the load adjusting unit of the continuous casting and rolling apparatus is provided adjacent to the exit side of the tunnel furnace, and is a drawer machine that separates the slab from the main path and draws the slab into the auxiliary path, and the tunnel furnace. It is provided adjacent to the entry side, and is characterized by including a pull-in machine that receives the slabs through an auxiliary path and pulls them onto the main path.

Then, the load adjusting unit of the continuous casting and rolling apparatus pulls the internal slab separated from the main path on the exit side of the tunnel furnace via the drawer, and enters the tunnel furnace via the retractor. It is characterized by being drawn on the main route of.

Further, the continuous casting and rolling apparatus is provided on an auxiliary path between the drawer and the lead-in machine, and includes a reheater for heating slabs on the auxiliary path.

Further, the continuous casting and rolling apparatus is provided on an auxiliary path between the drawer and the lead-in machine, and is characterized by including a smelting machine for melting slabs on the auxiliary path.

Further, the lead-in machine of the continuous casting and rolling apparatus is characterized in that it receives at least one of an internal slab produced by the continuous casting machine and an external slab conveyed from the outside and draws it onto the main path. To do.

In the continuous casting and rolling method according to the present invention, the internal slabs produced by the continuous casting machine are cut and supplied to the tunnel furnace from the internal slab supply stage and the main path of the slabs moving through the tunnel furnace. It is performed between the rolling step of receiving the slab and rolling down the slab, the internal slab supply step and the rolling step, and when the rolling step is interrupted, the slab on the main path. Is separated from the exit side of the tunnel furnace, and when the rolling step is restarted, the subworking step of drawing the slab from the entry side of the tunnel furnace onto the main path is included.

Here, in the sub-working step of the continuous casting and rolling method, when the rolling step is interrupted, the drawing step of separating the slab on the main path from the outlet side of the tunnel furnace and the rolling step are restarted. Then, it is characterized by including a pull-in step in which the slab separated from the main path on the exit side of the tunnel furnace is received on the auxiliary path and pulled into the main path on the entry side of the tunnel furnace. ..

Then, in the sub-working step of the continuous casting and rolling method, if the slab drawn into the main path maintains at least the execution temperature of the rolling step, another drawing step is performed between the drawing step and the drawing step. It is characterized in that the withdrawal stage is followed by the withdrawal stage so as to eliminate the step intervention.

Further, the sub-working step of the continuous casting and rolling method is performed before the pull-in step, and when the slab in the sub-working step drawn into the main path is lower than the execution temperature of the rolling step, the auxiliary It is characterized by including a reheating step of heating the slabs on the path.

Further, the sub-working step of the continuous casting and rolling method is performed before the lead-in step, and the slab separated from the main path on the exit side of the tunnel furnace is placed on the main path on the entry side of the tunnel furnace. It is characterized by including a melting step in which a slab is melted on an auxiliary path that is conveyed so as to be pulled in.

Further, the sub-working step of the continuous casting and rolling method is performed before the pull-in step, and the slab separated from the main path on the exit side of the tunnel furnace is placed on the main path on the entry side of the tunnel furnace. It is characterized by including an external slab supply stage in which an externally manufactured external slab is introduced on an auxiliary path for pulling in.

The external slab supply step of the continuous casting and rolling method is characterized in that the capacity of the slabs to be rolled in the rolling step is larger than the supply amount of the internal slabs.

The continuous casting and rolling apparatus and the continuous casting and rolling method of the present invention can supplement the temperature drop of the slab during abnormal operation and prevent the problem that the actual yield of the slab is lowered.

On the other hand, the continuous casting and rolling apparatus and the continuous casting and rolling method of the present invention prevent the problem of laminating slabs in the continuous casting process or wasting the capacity of the rolling mill. be able to.

However, the features and effects of the present invention are not limited to the above-mentioned contents, and can be understood more deeply by the description of the embodiments.

It is a layout block diagram which shows the movement path of a slab at the time of abnormal operation in the continuous casting rolling mill of this invention. It is a layout block diagram which shows the movement path which supplements the temperature loss of a slab at the time of abnormal operation in the continuous casting rolling mill of this invention. It is a layout block diagram which shows the movement path which performs the slab of slab in the continuous casting rolling mill of this invention. It is a layout block diagram which shows the movement path which accommodates the external slab in the continuous casting rolling apparatus of this invention. It is a layout block diagram which shows the moving path which accommodates an external slab and performs laminating in the continuous casting rolling apparatus of this invention. It is a flowchart which shows the continuous casting rolling method of this invention. It is a flowchart which shows the sub-working stage in the continuous casting rolling method of this invention.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. However, the embodiments of the present invention can be transformed into other embodiments, and the scope of the present invention is not limited to the following embodiments. The shape and size of the elements in the drawings may differ from the actual ones for a clearer explanation.

Also, as used herein, a singular expression includes a plurality of expressions unless they have distinctly different meanings in the context. It should be noted that the same reference numeral throughout the specification refers to the same component or the corresponding component.

The present invention can supplement the temperature drop of the slab during abnormal operation and prevent the problem that the actual yield of the slab is lowered with respect to the continuous casting and rolling apparatus and the continuous casting and rolling method. On the other side, it is possible to prevent the problem of laminating the slab in the continuous casting process or wasting the capacity of the rolling mill 30.

This will be described in detail with reference to the drawings. FIG. 1 is a layout configuration diagram showing a movement path of slabs during abnormal operation in the continuous casting and rolling apparatus of the present invention. As shown in FIG. 1, the continuous casting and rolling apparatus includes a continuous casting machine 10, a cutting machine 20 located on the exit side of the continuous casting machine 10, and a cutting machine 20 for cutting the internal slab IS manufactured by the continuous casting machine 10. A rolling mill 30 for rolling down a slab and provided downstream of the continuous casting machine 10 in the moving direction of the internal slab IS, and a rolling mill 20 provided between the cutting machine 20 and the rolling mill 30 from the continuous casting machine 10. A tunnel furnace 40 for heating slabs located on the main path MP of the internal slab IS transported to 30, and a slab provided adjacent to the tunnel furnace 40 and slabs on the main path MP are discharged from the tunnel furnace 40. It can include a load adjusting unit 50 which is separated from the side and draws slabs onto the main path MP from the entrance side of the tunnel furnace 40.

According to such a configuration, it is possible to prevent a problem that the slab is scrapped during an abnormal operation in which rolling work cannot be performed such as a defect of the rolling mill 30 or replacement of a transfer roll, and the actual yield is lowered. become.

That is, the slabs located in the tunnel furnace 40 or the slabs produced by the molten steel remaining in the continuous casting machine 10 are separated from the main path MP on the exit side of the tunnel furnace 40 by the load adjusting unit 50 during abnormal operation. And flow into the auxiliary path SP. Then, the slabs on the auxiliary path SP are pulled back onto the main path MP on the entry side of the tunnel furnace 40, and the time for the slabs to be located on the moving path can be increased.

In this way, even if the slab does not enter the rolling mill 30, by securing a path that remains on the moving path, the slab is scrapped due to the fact that the residual path of the slab is not secured. It is possible to prevent the problem of wasting.

Further, the load adjusting unit 50 limits the slabs entering the main path MP so as to flow into the entry side of the tunnel furnace 40, so that the temperature of the slabs lowered while moving through the auxiliary path SP. Can be complemented by the rollnable temperature.

The continuous casting machine 10 can play a role of producing an internal slab IS from molten steel through a casting process. That is, the continuous casting machine 10 supplies molten steel from the tundish to the mold, and the supplied molten steel is deprived of energy to form slabs. Then, the internal slab IS can be moved by being guided by a segment roll (Segment Roll) and a pinch roll (Pinch Roll), and can be supplied to the rolling mill 30 described later.

However, in the continuous casting machine 10, since the internal slab IS is produced depending on the solidification rate of the molten steel, it is difficult to adjust the production rate. Therefore, when the internal slab IS manufactured by the continuous casting machine 10 is continuously received and rolled by the rolling mill 30 described later to produce a product, the speed is restricted.

On the other hand, since the internal slab IS discharged from the continuous casting machine 10 has a high average temperature, there is an advantage that the temperature required for the rolling operation in the rolling mill 30 can be secured to some extent.

In the cutting machine 20, the slabs (internal slab IS or external slab OS) to be rolled in the rolling mill 30 are connected to the continuous casting machine 10 to form a continuous form, or are not separated from the continuous casting machine 10. It can play a role in adjusting whether the form is continuous. For this purpose, the cutting machine 20 is provided on the outlet side of the continuous casting machine 10.

In other words, when the cutting machine 20 allows the internal slab IS to pass freely without cutting, the rolling mill 30 continuously connects the internal slab IS manufactured and conveyed by the continuous casting machine 10 to the continuous casting machine 10. It is received and rolled. On the other hand, when the cutting machine 20 cuts the internal slab IS and conveys it to the rolling mill 30, the rolling mill 30 discontinuously receives the internal slab IS apart from the continuous casting machine 10 and performs rolling.

However, when the rolling mill 30 is interrupted due to abnormal operation, the internal slab IS needs to enter the auxiliary path SP or the like, so the cutting machine 20 cuts the slab.

The rolling mill 30 receives a slab such as an internal slab IS manufactured by the continuous casting machine 10 or an external slab OS that is conveyed and supplied from the outside as described later, and is rolled down to form a thin material or a thin material. It plays a role in producing heavy-duty products.

For this purpose, the rolling mill 30 rolls while passing the slab between the rolling roll pairs. In addition, a plurality of rolling stands provided with rolling roll pairs are installed.

In this way, the rolling mill 30 can perform rolling by setting various thicknesses for the slab.

The rolling mill 30 is divided into a rough rolling mill 30 and a finishing rolling mill 30. The rough rolling mill 30 is configured to first roll the slabs manufactured by the continuous casting machine 10, and the finish rolling mill 30 is configured to perform finish rolling on the slabs rolled by the rough rolling mill 30.

Here, when the rolling thickness for the slab is satisfied by the rough rolling mill 30, the slab is freely passed in a state where the rolling roll pair is open without rolling in the finish rolling mill 30. On the other hand, when the rolling thickness for the slab can be formed only by the operation of the finish rolling mill 30, the slab can be freely freed in a state where the rolling roll pair is open without rolling in the rough rolling mill 30. Let it pass.

Then, on the entrance side of the rough rolling mill 30 or the finish rolling mill 30, a heater for adjusting the rolling temperature of the slab, a scale remover for removing the scale, and the like are provided.

The tunnel furnace 40 plays a role of maintaining or raising the temperature at which the slab is rolled when the slab is conveyed to the rolling mill 30 for rolling.

For this purpose, the tunnel furnace 40 is provided between the continuous casting machine 10 and the rolling mill 30, and includes an internal slab IS manufactured by the continuous casting machine 10 or an external slab OS which is conveyed and supplied from the outside. The slab is heated to maintain or raise the temperature of the slab to the rolling temperature.

On the other side, the material of the slab can also be adjusted because the cooling rate associated with the increase in the temperature rise or the decrease in the heating amount of the slab can be adjusted.

For this purpose, the tunnel furnace 40 is provided with heating means such as a gas heating method and an induction heating method, and a plurality of heating means are provided according to the length of the tunnel furnace 40.

In particular, on the exit side of the tunnel furnace 40, the slab is separated from the main path MP of the internal slab IS transported from the continuous casting machine 10 to the rolling mill 30 to the auxiliary path SP, and on the entrance side of the tunnel furnace 40. A load adjusting unit 50 for drawing slabs from the auxiliary path SP to the main path MP is provided. Here, the tunnel furnace 40 is linked with the load adjusting unit 50.

The load adjusting unit 50 separates the slab from the main path MP on the exit side of the tunnel furnace 40 and draws it into the auxiliary path SP, and separates the slab from the auxiliary path SP on the entrance side of the tunnel furnace 40 to separate the slab from the auxiliary path SP. It plays a role of attracting to MP. This is a path in which the slabs remain in order to prevent the problem that the slabs are scrapped and the actual yield decreases during abnormal operations in which rolling operations are impossible, such as defects in the rolling mill 30 or replacement of transfer rolls. Is extended to the auxiliary route SP. As a result, the slab can remain on the main path MP and the auxiliary path SP without being discarded until the operation is normalized.

For this purpose, the load adjusting device 50 can include a drawer 51 and a retractor 52. That is, the load adjusting unit 50 of the continuous casting and rolling apparatus according to the embodiment of the present invention is provided adjacent to the exit side of the tunnel furnace 40, and the slab is separated from the main path MP and drawn into the auxiliary path SP. A pull-out machine 51 and a pull-in machine 52 provided adjacent to the entrance side of the tunnel furnace 40 and receiving the slabs via the auxiliary path SP and drawing them onto the main path MP can be included.

The drawer 51 is located on the exit side of the tunnel furnace 40 and plays a role of transporting the slab from the main path MP to the auxiliary path SP. As a result, the movement path of the slab from the exit side of the tunnel furnace 40 to the rolling mill 30 is changed to the auxiliary path SP, so that the movement path of the slab is expanded.

The drawer 51 can be configured by a pusher or the like that pushes the slab on the transfer roll, but is not limited to this, and the slab can be transported from the main path MP to the auxiliary path SP. If so, it can be the drawer 51 of the present invention.

The pull-in machine 52 is located on the entrance side of the tunnel furnace 40 and plays a role of transporting the slab from the auxiliary path SP to the main path MP. As a result, the slabs separated from the outlet side of the tunnel furnace 40 are conveyed toward the rolling mill 30.

Further, since the lead-in machine 52 is provided on the entrance side of the tunnel furnace 40, the tunnel furnace 40 can heat the slabs, and the temperature of the slabs that have fallen while moving through the auxiliary path SP can be rolled. Can be heated up to.

Like the drawer 51, the lead-in machine 52 is also composed of a pusher that pushes the slab on the transfer roll, but the present invention is not limited to this, and the slab is conveyed from the auxiliary path SP to the main path MP. The pull-in machine 52 of the present invention can be used as long as it can be configured.

Then, the load adjusting unit 50 of the continuous casting and rolling apparatus according to the embodiment of the present invention pulls in the internal slab IS separated from the main path MP on the exit side of the tunnel furnace 40 via the drawer 51. It can be drawn onto the main path MP on the entrance side of the tunnel furnace 40 via.

In other words, another configuration is not presented on the movement path of the slab moving from the drawer 51 to the retractor 52, and an auxiliary path SP for directly connecting the drawer 51 and the retractor 52 is formed to form the slab. Is configured to move.

In forming the auxiliary path SP in this way, the length of the auxiliary path SP can be adjusted according to the number of slabs that need to remain.

However, the length of the auxiliary path SP is limited in consideration of the cooling amount of the slab on the auxiliary path SP. That is, it is necessary that the temperature of the slab on the inlet side of the rolling mill 30 is equal to or higher than the rollable temperature in consideration of the amount of temperature rise in the tunnel furnace 40 added to the slab and the amount of cooling of the slab coming out of the auxiliary path SP. Due to such a relationship, the maximum distance of the auxiliary route SP is limited.

FIG. 2 is a layout configuration diagram showing a movement path that complements the temperature loss of slabs during abnormal operation in the continuous casting and rolling apparatus of the present invention. As shown in FIG. 2, the continuous casting and rolling apparatus according to the embodiment of the present invention is provided on the auxiliary path SP between the drawer 51 and the lead-in machine 52, and reheats the slabs on the auxiliary path SP. A heater 60 can be included.

As described above, the reason why the reheater 60 is further provided on the auxiliary path SP is that as the number of slabs that need to remain on the auxiliary path SP increases, the temperature of the slabs on the residual path decreases (cooling amount). ) Exceeded the range that can be complemented by the tunnel furnace 40.

This prevents the internal slab IS manufactured by the continuous casting machine 10 from being discarded when the period of abnormal operation is prolonged, and the internal slab IS remaining on the main path MP or the auxiliary path SP. This is the case where the quantity of

The reheater 60 can be provided in a configuration similar to that of a tunnel furnace 40. That is, the reheater 60 can be provided with heating means such as a gas heating method or an induction heating method, and a plurality of heating means can be provided depending on the length of the heating section.

FIG. 3 is a layout configuration diagram showing a moving path for laminating slabs in the continuous casting and rolling apparatus of the present invention. Referring to FIG. 3, the continuous casting and rolling apparatus according to the embodiment of the present invention is provided on the auxiliary path SP between the drawer 51 and the lead-in machine 52, and melts the slabs on the auxiliary path SP. A shaving machine 70 can be included.

The smelting machine 70 plays a role of performing scouring on the internal slab IS or the external slab OS as needed for the product to be produced.

As an example, the mill 70 forms the outer surface of a slab with necessary properties by injecting high-pressure oxygen onto the surface or edge of the slab to oxidize or melt it.

In particular, the smelting machine 70 is not provided on the main path MP, but is provided on the auxiliary path SP, so that an unnecessary main path MP section is provided for slabs that do not require thawing treatment. Prevents the problem of wasted and unnecessary cooling. In addition, slabs that require welding work are selectively welded.

FIG. 4 is a layout configuration diagram showing a movement path for accommodating an external slab OS in the continuous casting and rolling apparatus of the present invention, and FIG. 5 is a layout configuration diagram for accommodating an external slab OS in the continuous casting and rolling apparatus of the present invention. It is a layout block diagram which shows the movement path which performs.

With reference to FIGS. 4 and 5, the lead-in machine 52 of the continuous casting and rolling apparatus according to the embodiment of the present invention is among the internal slab IS manufactured by the continuous casting machine 10 and the external slab OS conveyed from the outside. At least one can be received and pulled onto the main path MP.

In other words, the rolling mill 30 is not limited to supplying only the internal slab IS manufactured by the continuous casting machine 10 to the rolling mill 30 to perform rolling, and by introducing an externally manufactured slab, the rolling mill 30 It is configured so that the rolling capacity is not wasted. As a result, the production efficiency of the product produced by the rolling mill 30 can be improved.

Further, in consideration of the rolling capacity of the rolling mill 30, a plurality of continuous casting machines 10 may be linked to one rolling mill 30 to form a main path MP. On the other side, the slab moving path connecting the main continuous casting machine 10 and the rolling mill 30 is formed as the main path MP, and the slabs manufactured by the other continuous casting machine 10 pass through the auxiliary path SP. It can also be configured to be transported to the rolling mill 30.

Then, the external slab OS constitutes a movement path via the smelting machine 70 when a smelting process is required, and passes through a reheater 60 when additional heating is required. It is also possible to construct a movement route.

FIG. 6 is a flowchart showing the continuous casting and rolling method of the present invention. Referring to FIG. 6, the continuous casting and rolling method according to another embodiment of the present invention includes an internal slab supply stage in which the internal slab IS manufactured by the continuous casting machine 10 is cut and supplied to the tunnel furnace 40, and a tunnel. It is performed between the rolling step of receiving the slabs and rolling down the slabs on the main path MP of the slabs moving through the furnace 40, the internal slab supply step and the rolling step, and the rolling step is interrupted. Then, the slab on the main path MP is separated from the exit side of the tunnel furnace 40, and when the rolling stage is restarted, the slab is pulled into the main path MP from the entrance side of the tunnel furnace 40. And can include.

In this way, by providing the sub-working stage, it is possible to prevent the problem that the slabs are scrapped and the actual yield is lowered at the time of abnormal operation in which rolling work is impossible such as a defect of the rolling mill 30 or replacement of the transfer roll. can do.

That is, the slabs located in the tunnel furnace 40 or the slabs produced by the molten steel remaining in the continuous casting machine 10 are separated from the main path MP on the exit side of the tunnel furnace 40 during abnormal operation and are separated from the auxiliary path SP. And the slabs on the auxiliary path SP can be pulled back onto the main path MP on the entry side of the tunnel furnace 40 to increase the time the slabs are on the moving path.

In this way, even if the slab does not enter the rolling mill 30 for rolling, by securing the path remaining on the moving path, the slab is caused by the fact that the residual path of the slab is not secured. It is possible to prevent the problem of being scrapped and wasted.

Further, by limiting the slabs entering the main path MP so as to flow into the entrance side of the tunnel furnace 40, the temperature of the slabs lowered while moving through the auxiliary path SP is supplemented by the rollnable temperature. can do.

Here, the internal slab supply stage is a stage in which molten steel is manufactured into the internal slab IS by the continuous casting machine 10, and the rolling stage is a stage in which the slab is reduced through the rolling mill 30 to form a rolled product. It is a stage.

Then, in the sub-working stage, as described above, in order to prevent the problem that the slabs are discarded during abnormal operation, the internal slab IS is conveyed from the continuous casting machine 10 to the rolling mill 30 to the main path MP. In addition, it is the stage of forming the auxiliary path SP.

More specifically, the sub-working step of the continuous casting and rolling method according to another embodiment of the present invention is a drawing that separates the slab on the main path MP from the exit side of the tunnel furnace 40 when the rolling step is interrupted. When the stage and the rolling stage are restarted, the slabs separated from the main path MP on the exit side of the tunnel furnace 40 are received on the auxiliary path SP and drawn into the main path MP on the entrance side of the tunnel furnace 40. Stages and can include.

In other words, it includes a drawing step for transporting slabs from the main path MP onto the auxiliary path SP, and a pulling step for supplying slabs from the auxiliary path SP onto the main path MP.

Then, the withdrawal stage and the withdrawal stage are performed so that another stage does not intervene between them. Thereby, another step is not performed on the auxiliary path SP, and the slab can be configured to remain on the main path MP and the auxiliary path SP.

That is, the sub-working step of the continuous casting and rolling method according to another embodiment of the present invention is between the drawing step and the pulling step when the slab drawn on the main path MP maintains at least the execution temperature of the rolling step. The withdrawal stage can be followed by the withdrawal stage so as to eliminate the intervention of other stages.

The subworking stage is performed in this way when the period of abnormal operation is short so that the amount of cooling while remaining on the auxiliary path SP can be complemented through the tunnel furnace 40.

However, if the period of abnormal operation becomes long, the amount of cooling while remaining on the auxiliary path SP increases, and the rolling execution temperature cannot be secured. In this case, the slab is reheated between the drawing stage and the drawing stage.

That is, the sub-working step of the continuous casting and rolling method according to another embodiment of the present invention is performed before the pull-in step, and the slab in the sub-working step drawn on the main path MP is lower than the execution temperature of the rolling step. In some cases, a reheating step of heating the slabs on the auxiliary path SP can be included.

The reheating step is performed via a reheater 60 provided on the auxiliary path SP.

Further, the sub-working step of the continuous casting and rolling method according to another embodiment of the present invention is performed before the pull-in step, and the slabs separated from the main path MP on the exit side of the tunnel furnace 40 are removed from the tunnel furnace 40. It can include a melting step in which the slab is melted in an auxiliary path SP that is conveyed so as to be drawn onto the main path MP on the entry side.

The laminating step is performed when producing automobile skin materials and products that require excellent surfaces.

For this purpose, the smelting step is performed via a smelting machine 70 provided on the auxiliary path SP. This makes it possible to prevent the problem that the main path MP is increased by the mill 70. As a result, the problem of cooling the slabs on the main path MP can also be prevented.

Further, the sub-working step of the continuous casting and rolling method according to another embodiment of the present invention is performed before the pull-in step, and the slabs separated from the main path MP on the exit side of the tunnel furnace 40 are removed from the tunnel furnace 40. It can include an external slab supply stage in which an externally manufactured external slab OS is introduced on an auxiliary path SP that is carried so as to be drawn onto the main path MP on the entry side.

In other words, it is not limited to the internal slab IS supplied at the internal slab supply stage, but further adds a stage for supplying the external slab OS introduced from the outside.

As described above, the reason why the external slab supply stage is further performed is to prevent the problem that the rolling mill 30 that performs the rolling stage wastes the capacity for rolling.

In other words, the external slab supply step of the continuous casting and rolling method according to another embodiment of the present invention is performed when the capacity of the slabs to be rolled in the rolling step is larger than the supply amount of the internal slab IS. Can be done.

Although the embodiments of the present invention have been described in detail above, the scope of rights of the present invention is not limited to this, and various modifications and modifications and modifications are made without departing from the technical idea of the present invention described in the claims. It can be transformed.

10 Continuous casting machine 20 Cutting machine 30 Rolling machine 40 Tunnel furnace 50 Load adjustment unit 51 Drawer 52 Drawer 60 Reheater 70 Melting machine IS Internal slab MP Main path OS External slab SP Auxiliary path

Claims (13)

With a continuous casting machine,
A cutting machine located on the outlet side of the continuous casting machine and cutting internal slabs manufactured by the continuous casting machine.
A rolling mill that rolls down the slab and is provided downstream of the continuous casting machine in the moving direction of the internal slab.
A tunnel furnace provided between the cutting machine and the rolling mill to heat slabs located on the main path of the internal slabs conveyed from the continuous casting machine to the rolling mill.
A load adjusting unit provided adjacent to the tunnel furnace, which separates the slabs on the main path from the exit side of the tunnel furnace and pulls the slabs onto the main path from the entrance side of the tunnel furnace. A continuous casting and rolling apparatus characterized in that. The load adjustment unit is
A drawer machine installed adjacent to the exit side of the tunnel furnace to separate the slab from the main path and pull it into the auxiliary path.
The continuous casting according to claim 1, further comprising a lead-in machine provided adjacent to the entrance side of the tunnel furnace and receiving the slabs through an auxiliary path and drawing the slabs onto the main path. Rolling equipment. The load adjusting unit draws the internal slab separated from the main path on the exit side of the tunnel furnace via the drawer machine onto the main path on the entrance side of the tunnel furnace via the pull-in machine. The continuous casting and rolling apparatus according to claim 2. The continuous casting and rolling apparatus according to claim 2, further comprising a reheater provided on an auxiliary path between the drawer and the lead-in machine and heating a slab on the auxiliary path. The continuous casting and rolling apparatus according to claim 2, further comprising a smelting machine provided on an auxiliary path between the drawer and the drawing machine and smelting slabs on the auxiliary path. The drawing machine according to claim 2, wherein the pulling machine receives at least one of an internal slab produced by the continuous casting machine and an external slab conveyed from the outside and is drawn onto the main path. Continuous casting and rolling equipment. The internal slab supply stage, which cuts the internal slabs manufactured by the continuous casting machine and supplies them to the tunnel furnace,
A rolling step in which the slab is transported on the main path of the slab moving through the tunnel furnace and the slab is reduced.
It is performed between the internal slab supply step and the rolling step, and when the rolling step is interrupted, the slab on the main path is separated from the exit side of the tunnel furnace, and the rolling step is restarted. Then, a continuous casting and rolling method comprising a sub-working step of drawing slabs onto the main path from the entrance side of the tunnel furnace. The sub-working stage is
When the rolling step is interrupted, a drawing step of separating the slab on the main path from the exit side of the tunnel furnace, and a drawing step.
When the rolling step is restarted, the slab separated from the main path on the exit side of the tunnel furnace is received on the auxiliary path and drawn into the main path on the entry side of the tunnel furnace. The continuous casting and rolling method according to claim 7, further comprising. The sub-working stage is
If the slabs drawn into the main path maintain at least the performance temperature of the rolling step, then the pulling step is performed so as to eliminate the intervention of other steps between the pulling step and the pulling step. The continuous casting and rolling method according to claim 8, wherein the pull-in step is performed one after another. The sub-working stage is
Includes a reheating step that heats the slabs on the auxiliary path if the slabs in the subworking step that are performed prior to the pull-in step and are drawn onto the main path are below the performance temperature of the rolling step. The continuous casting and rolling method according to claim 8, wherein the method is characterized by the above. The sub-working stage is
The slabs are placed on an auxiliary path that is performed before the lead-in step and conveys the slabs that have been separated from the main path on the exit side of the tunnel furnace so as to be drawn onto the main path on the entrance side of the tunnel furnace. The continuous casting and rolling method according to claim 8, further comprising a smelting step for smelting. The sub-working stage is
Manufactured externally on an auxiliary path that is performed prior to the lead-in step and transports the slabs separated from the main path on the exit side of the tunnel furnace so as to be drawn onto the main path on the entry side of the tunnel furnace. The continuous casting and rolling method according to claim 8, further comprising an external slab supply stage for introducing the external slabs. The continuous casting and rolling method according to claim 12, wherein the external slab supply step is performed when the capacity of the slabs to be rolled in the rolling step is larger than the supply amount of the internal slabs. ..

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