KR101417230B1 - Batch and Endless Rolling System and Method - Google Patents

Abstract

The present invention provides a batch and continuous continuous combined system and method capable of selecting continuous continuous rolling and batch rolling according to a casting speed in a performance-rolling direct-cutting process, and includes a performance equipment for producing a slab; A cutter disposed at a rear end of the performance equipment; A rolling mill disposed at a rear end of the cutter; And a cooling device disposed at a rear end of the rolling mill, wherein the casting facility produces a cast steel having a thickness of 30 to 150 mm at a casting speed of 4.5 to 15 mpm, and, according to the casting speed of the casting produced in the casting facility, There is provided a batch and continuous continuous rolling system in which a slab is cut to provide a slab to a rolling mill to selectively perform batch rolling and continuous continuous rolling in which a slab produced in a continuous casting machine is directly rolled into a rolling mill.

Description

[0001] Batch and Endless Rolling System and Method [0002]

The present invention relates to a system and method for combined batch and continuous rolling, in which a slab produced in a high speed casting facility is continuously rolled through a rough rolling facility and a finish rolling mill to produce a hot rolled steel sheet, And to a batch and continuous rolling system capable of working without interruption in the trouble of rolling or replacing the rolling rolls.

In the mini - mill process, rolling is performed using high temperature of coagulated cast steel in the casting machine. This mini-mill process can be roughly classified into two types according to the method of connecting the mill and the rolling mill.

The first is a tunnel heating furnace 5 installed between the performance machine 1 and the rolling mill 7 as in Patent Document 1, and functions as a buffer when the slab 2 is heated up and in the rolling section. However, in this process, the length of the tunnel heating furnace 5 reaches 200 to 300 m and it is impossible to apply continuous continuous rolling to produce a superfine laminate (thickness of 1.2 mm or less) (see FIG.

Alternatively, as disclosed in Patent Document 2, a process has been disclosed in which the continuous casting is dedicated for continuous continuous rolling by connecting the continuous casting machine 1 and the rolling mill 7 directly and arranging the heating furnace 5 as a heating device between the rolling mills 7. However, it is pointed out that a high speed casting is required due to a slower speed than the rolling speed, and there is no space between the casting machine and the rolling mill.

Continuous continuous rolling in which a slab or a bar is continuously supplied to the rolling mill 7 is advantageous in that the stub end of the strip does not exist and the stability of the plate is secured so that a uniform material can be obtained from the rolled steel sheet have.

In the general hot-rolling process, this operation can be performed by joining the primary rolled bars, but due to various problems of joining, it is difficult to apply the yarn. The mini mill process realizes such continuous rolling through the performance-rolling direct connection, which can fundamentally eliminate difficulties due to the joining.

However, when the performance - rolling is directly connected, the temperature of the rolling section falls due to the slow speed and the rolling speed synchronized. These problems can be solved by the development of high-speed casting technology, but it is still difficult to apply to various steel types.

In addition, in the performance-rolling direct connection process, there is a problem that discontinuing the performance when replacing a wrong roll or an irregular roll in the rolling section causes a serious problem in the entire production.

(Patent Document 1) KR 1988-0005980 A

(Patent Document 2) KR 1990-7001437 A

SUMMARY OF THE INVENTION It is an object of the present invention to provide a batch and continuous continuous system and method capable of selecting continuous continuous rolling and batch rolling according to a casting speed in a performance- .

It is another object of the present invention to provide a batch and continuous continuous combined system and method which are simple in facility design while selectively performing batch rolling and continuous continuous rolling.

It is still another object of the present invention to provide a continuous continuous rolling system and method capable of ensuring time for performing a malfunction and a roll replacement without interrupting the performance even when the rolling section is malfunctioned or the irregular roll is replaced in the performance- .

In order to achieve the above object, the present invention provides the following batch and continuous continuous rolling system and method.

The present invention relates to a performance equipment for producing a cast steel; A cutter disposed at a rear end of the performance equipment; A rolling mill disposed at a rear end of the cutter; And a cooling device disposed at a rear end of the rolling mill, wherein the casting facility produces a cast steel having a thickness of 30 to 150 mm at a casting speed of 4.5 to 15 mpm, and, according to the casting speed of the casting produced in the casting facility, There is provided a batch and continuous continuous rolling system in which a slab is cut to provide a slab to a rolling mill to selectively perform batch rolling and continuous continuous rolling in which a slab produced in a continuous casting machine is directly rolled into a rolling mill.

In the present invention, the rolling mill includes a rough rolling mill and a finishing rolling mill, and the rough rolling mill and the finishing rolling mill can be continuously arranged.

In the present invention, a space portion for feeding a casting passing through a predetermined distance may be positioned between the cutter and the rolling mill, and a heat cover covering one or more surfaces of the cast steel may be disposed in the space to heat the cast steel being conveyed.

A heater for raising the temperature of the cast steel may be disposed on the rolling mill side of the space portion.

At this time, the space portion may have a distance of 20 to 30 m.

In addition, a filer accommodating the cut slab may be disposed on the side of the space, and the heat cover is configured to open the side, and the pusher for pushing the slab cut by the cutter through the open side and the pusher The side of the part includes a filer arranged to receive the cut slab, which can stack the cut slab pushed by the pusher.

Alternatively, the present invention relates to a continuous casting process for producing a cast slab; And a rolling step of rolling the slabs produced in the continuous casting step, wherein a batch rolling step of cutting the slabs before the rolling step is carried out in accordance with the speed of casting produced in the continuous casting step, It is possible to provide a rolling method for selectively performing continuous continuous rolling which continuously rolls a casting of a casting step.

At this time, the rolling step may be performed continuously in rough rolling and finish rolling.

In addition, the casting step may include a conveying step of conveying the cast produced in the continuous casting step before the rolling step a predetermined distance, and the weight of the casting step may be 15 to 30t.

Also, in the conveying step, a cast slab of 1250 to 1300 ° C is supplied, and the cast slab can maintain a temperature of 1000 ° C or more in the conveying step.

In the transferring step, boiling heat may be performed together to prevent the temperature of the cast steel from falling.

Further, the rolling step may be supplied with a slab between 1000 and 1200 ° C, and the slab may maintain a temperature of 850 ° C or higher in the rolling step.

The present invention may further include a heating step for raising the temperature of the casting passing between the conveying step and the rolling step, wherein the heating step is carried out when continuous continuous rolling is continuously performed for rolling the casting of the continuous casting step Lt; / RTI >

And a slab processing step of withdrawing a slab passing through the transfer step from the slab shift line after cutting and withdrawing the slab supplied during the rolling slab from the slab shift line when the cause of rolling interruption occurs, And a cutting processing step of cutting the slab fed to the feeding step in the performance step while cutting the slab in the feeding step.

According to the present invention, it is possible to provide a batch and continuous continuous combined system and method capable of selecting continuous continuous rolling and batch rolling according to the casting speed in the performance-rolling direct-cutting process.

In addition, the present invention can provide a batch and continuous continuous combined system and method that can simplify facility design while selectively performing batch rolling and continuous continuous rolling.

Further, the present invention provides a system and method for combination and continuous rolling that enables a time for performing a malfunction and a roll replacement to be performed without interrupting the performance even when a wrong section of a rolling section or an irregular roll is replaced in a performance-rolling direct- can do.

FIG. 1A is a schematic diagram showing the prior art. FIG.
1B is a schematic diagram showing another prior art.
2 is a schematic diagram of a batch and continuous continuous rolling system of the present invention.
3 is a side schematic view of a batch and continuous continuous rolling combined system, and Fig. 3 (c) is a side schematic view of the batch and continuous continuous rolling system of the present invention. Fig. 2 is a schematic plan view of the combined system.
Figs. 4A and 4B are views showing the operation of the filer and the pusher in the space portion of the present invention, and Fig. 4C are views showing the operation of the heat cover together with the filer and the pusher.
5 is a flow chart of a batch and continuous continuous rolling system of the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

A schematic diagram of a continuous continuous rolling system of the present invention is shown in Fig. 2, a side schematic view of a batch and continuous continuous rolling system is shown in Figs. 3a and 3b, .

As shown in FIG. 2, the batch and continuous rolling combined system of the present invention comprises a caster facility 101 for producing a casting slag; A cutter 110 disposed at a rear end of the performance equipment 101 for cutting a slab; A space portion 120 disposed at a rear end of the cutter 110 and having rollers 121 disposed therein to feed the strip to the rolling mill 160 and a rolling mill 160 disposed at a rear end of the space 120.

The space part 120 is provided with a heat cover 125 for cutting a casting product passing through the space part 120 to prevent the temperature of the casting product from being lowered from the outside to the outside, And a pusher 135 and a filer 130 are disposed on a side surface of the space 120. [

And a descaler 150 for removing the scale of the billet surface before the billet is supplied to the billet 160. The billet that has passed through the billet 160 and rolled to a final thickness is cooled by a cooling device 170 A high speed cutter 180 is disposed at the rear end of the cooling device 170 so as to cut the strip in the case of continuous continuous rolling after passing through the cooling device 170 and the strip cut at the high speed cutter 180 And wound in a winder (190).

The high speed cutter 180 is used in continuous continuous rolling, the desired weight is achieved, the high speed cutter 180 operates and cuts the strip, and the cut strip is wound in the winder 190. The descaler 150, the rolling mill 160, the cooling device 170, the high speed cutter 180, and the take-up device 190 can be widely known in the art, and a detailed description thereof will be omitted in the present invention .

In the present invention, the casting facility 101 can provide a casting of 30 to 150 mm at a rate of 4.5 to 15 mpm (meter per minute), and the casting temperature at the outlet of the casting facility 101 is 1250 to 1300 ° C. The casting facility 101 may provide a cast steel having a size of 80 to 100 mm at a temperature of 1250 to 1300 ° C.

In the present invention, the cast steel provided in the casting facility 101 under the above conditions passes through the cutter 110 and flows into the space portion 120. However, when the continuous continuous rolling is performed as described later, the cutter 110 does not operate. The temperature of the casting passing through the thermal cover 125 is prevented from being reduced in the space 120 but the temperature drop in the space 120 due to the feeding speed of the casting is sufficiently small, The thermal cover 125 may be omitted. This is because the amount of heating is limited even if the heater 140 is provided at the rear, so that it is difficult to perform hot rolling in the case where the temperature is not maintained at 1000 to 1100 캜 or more.

The thermal cover 125 may be implemented in such a way as to cover one side of the casting through which it will pass, as will be discussed again with respect to Figures 3b and 5.

The space portion 120 is a space for supplying the cast steel when the batch rolling is performed, so that the length is such that the main coil can be positioned between 15 and 30 t which makes one coil. This generally corresponds to a length of 20 to 30 meters. In this way, the space portion 120 can accommodate the casting to make one coil, which is advantageous for selectively performing batch rolling and continuous continuous rolling. That is, when continuous continuous rolling is difficult, the casting with the space portion 120 is cut by the cutter 110 to perform the batch rolling. Since the main cutting piece to be cut in this way is a weight capable of winding one coil, The finished product is rolled up into a single coil so that there is no waste. In addition, since the main body of the coil portion can be supplied to the rolling mill 160 in a state where it is cut in advance, it is possible to solve the problem caused by the inconsistency in the throughput of the rolling mill 101 and the rolling mill 160.

A heater 140 is disposed in the space part 120 and increases the temperature of the casting material while passing through the space part 120. The heater 140 raises the cast steel that is provided at a temperature of 1000 to 1100 DEG C or higher to a rolling-enabled temperature. The heater 140 is operated only in the continuous series in which the rolling speed is limited by the performance speed and may not operate in the batch rolling in which the rolling can be performed irrespective of the performance speed. The length of the space 120 is a length including a space in which the heater 140 is disposed. The heater 140 may be a transverse type It is preferable that it is a heater.

That is, in the present invention, the cast steel produced in the casting facility 101 passes through the cutter 110 and is continuously rolled at the production speed of the cast steel and rolled at the casting speed in the rolling mill 160, If the casting temperature is not lower than the rollable temperature (850 ° C. or higher), continuous continuous rolling is performed. If the casting temperature is lower than the rolling temperature, the slab is cut through the cutter 110 to form a slab, The cut slab, that is, the slab S, is sent to the mill 160 to perform batch rolling.

In determining continuous continuous or batch rolling, it may be determined in consideration of the temperature drop of the cast steel due to the space portion 120 and the heating amount of the heater 140 compensating for the temperature. It is preferable that the heater 140 is provided as an induction heater to perform noncontact heating.

In the present invention, the rolling mill 160 can be continuously arranged in a rough rolling mill and a finishing rolling mill, and the construction of the plant can be simplified when the rough rolling mill and the finishing rolling mill are continuously arranged. Rolling mills including roughing and finishing mills can be constructed with 4 to 8 stands connected.

In the rolling mill 160, when the temperature of the cast steel is lowered, it may affect the amount of rolled down and the quality of the steel product, and therefore, a steel casting temperature of 850 ° C or higher should be secured. Therefore, it is preferable that the cast steel provided to the rolling mill 160 has a temperature of 1000 to 1200 ° C.

In the present invention, when a trouble occurs in the rolling mill 160 (see FIG. 3B), the pusher 135 and the filer 130, which cut the billet of the space 120 and take it out of the billet traveling line, .

In the case of the retrofitting equipment 101, all of the molten material must be made into a cast, and casting can not be interrupted. However, when the rolling is stopped during the casting, the entire casting is not moved due to the rolling, thereby stopping the casting.

In order to prevent the casting from being stopped, in the present invention, when the batch rolling is being performed, the cut slab, that is, the slab S positioned in the space portion 120 is moved to the filer 130 disposed on the side of the space portion 120 So that casting can be continued until all the waste of the performance equipment 101 is exhausted. In this way, when the slab S is taken out to the filer 130 on the side of the space portion 120, the slab S collected in the filer 130 is transferred to another process for processing the slab S, . ≪ / RTI > The above-described operation can be performed more easily without interfering with other facilities when the space portion 120 has a length in which one main piece can be positioned and the heater 140 has a side opened form.

Meanwhile, if the casting speed is sufficiently high so that continuous continuous rolling can be performed, and there is a cause of interruption of rolling during continuous continuous rolling without using the cutter 110, the cutter 110 is operated to rotate the cutter 110 The slab is cut. At this time, the heat cover 125 is moved upward from the position surrounding the cast steel (see FIG. 3B).

The worker cuts the slab at the cutting operation portion 145 of the end portion of the space portion 120 on the side of the rolling mill 160 after the thermal cover 125 is lifted, The end portion of the hollow portion 160 is cut so that the slab S of the hollow portion 120 is formed. This is because it is difficult to remove the billet inside the rolling mill 160 in the case of the trouble of the rolling mill 160, so that the billet that does not enter the mill 160 is cut.

The cut slab S, that is, the slab S is pushed by the pusher 135 disposed at one side of the space portion 120 in the direction perpendicular to the traveling direction of the casting slab, . Since the heater 140 is disposed in the space 120, the heater 140 is a transverse type in which the side can be opened so that the slab S can be separated from the slab S by the pusher 135, . However, if the side can be opened, a different type of heater 140 may be used.

In the batch and continuous continuous rolling combination system, the continuous casting machine 101 continuously produces the cast irregularly regardless of the reason for the interruption of rolling, so that the continuous casting of the casting machine 101 from the continuous casting machine 101, do. Thus, after the first cutting, the cast steel flowing into the space 120 is cut into a small size piece by a cutter 110 and removed to a different position, thereby cutting the cast piece of the space portion 120, Thereby preventing further ingestion of the casting during the processing of the slab.

Figures 4a and 4b show the operation of the filer 130 and the pusher 135 in the space 120 of the present invention and Figure 4c shows the operation of the thermal cover 125 with the filer 130 and the pusher 135 The dynamic appearance is shown.

As shown in FIGS. 4A and 4B, both ends of the space 120 are cut through the cutter 110 and the additional cutting or cutting operation part 145, and after the thermal cover 125 is lifted, the space part 120 The pusher 135 pushes the slab S into the space portion 120 by the filer 130. [

At this time, in addition to the running roller 121, the roller 122 used to slide the slab S to the side can support the slab S. For such a structure, Korean Unexamined Patent Publication No. 2003-0075615, 2004-0011713, the detailed structure of which is not described.

When the slab S of the space 120 is pushed by the pusher 135 and is piled up with the filer 130 to empty the space 120, the slab S is cut into a small size through the cutter 110, The slab is introduced into the space 120 and the slab 110 is operated again when the main slab fills the space 120 to cut the slab into the length of the space 120, S, pushing it with the previous pusher 135, and putting it with the filer 130. [

4C shows a state in which only the side surface of the thermal cover 125 is opened so that the pusher 135 and the cut slab S can be pulled out without lifting the entire thermal cover 125 in a state where the thermal cover 125 is disposed An openable structure is shown.

4C, the thermal cover 125 includes a fixed upper surface 126, a side fixing portion 128, and a side flow portion 127. By driving the driving portion 129, the side flow portion The slab S of the space portion 120 is moved to the filer 130 by the pusher 135 in the opened space by raising the side flow portion 127 by the drive portion 129 .

As such, the batch and continuous continuous rolling system of the present invention can be processed in one system even if the casting speed of the performance equipment 101 is fast or slow. In addition, since the space portion 120 has a length of 20 to 30 m, it is possible to process an amount corresponding to one coil in the rolling mill 160 in the case of batch rolling.

Further, in the batch and continuous continuous rolling combined system of the present invention, it is not necessary to stop casting in the continuous casting machine 101 even if a rolling trouble occurs in continuous continuous rolling, and the slab S The cast steel produced in the casting facility 101 during the rolling trouble processing can be easily utilized.

Fig. 5 shows a flow chart of the batch and continuous continuous rolling system of the present invention. When the cast iron is supplied to the casting machine 101 of the batch and continuous continuous rolling system, the user inputs the casting speed of the cast iron or the casting speed of the casting (S100). The temperature of the cast steel is expected to decrease in the rolling mill 160 considering the input steel grade or the input casting speed and the amount of heating in the heating apparatus 140 (S110).

If it is determined that the temperature of the casting slab 160 in the rolling mill 160 is higher than the temperature at which hot rolling is possible, that is, the target temperature is higher than the target temperature (S120) The slabs produced in the performance equipment 101 are fed directly to the rolling mill 160 after passing through the space 120. At this time, in the space 120, the heat is kept at the heat cover 125, the heater 140 operates at the heating amount considered in the anticipating step S110, and continuous continuous rolling is performed (S130).

Although this step may be performed by inputting the casting speed according to the type of steel, the operator may select and execute continuous continuous rolling and batch rolling according to the type of steel.

(S140), both ends of the casting of the hollow portion 120 are cut off. At this time, the casting of the hollow portion 120 is stopped The inflowing portion of the molten metal introduced at the time of the processing is cut into a small size by the cutter 110 so that there is no molten steel flowing into the space 120 (S150).

The slab S cut to the length of the space 120 is moved to the filer 130 through the pusher 135 in step S160, And the space portion 120 is filled with a billet (S170).

If it is determined that the cause of the interruption of rolling has been completed (S180), if the reason for the interruption is ended, the billet 110 is not operated and the billet is supplied to the rolling mill 160 Continuous rolling is resumed (S130).

If the cause of interruption of rolling is not terminated, the slab filled in the space 120 is cut through the cutter 110 (at this time, the end on the side of the rolling mill 160 need not be cut off; S190) The step S160 of moving the slab S of the slab 120 back to the filer 130 is repeated.

On the other hand, when it is compared whether the temperature of the casting slab expected in the rolling mill 160 is higher than the temperature at which the hot rolling can be performed, that is, the target temperature is higher than the target temperature (S120), batch rolling is performed when the temperature is expected to be lower than the target temperature. The batch rolling is to cut the slab S into the length of the space 120 through the cutter 110 to make the slab S and to roll the slab S faster than the casting speed.

The slab S cut to the length of the space portion 120 is not supplied to the rolling mill 160 and the slab S cut to the length of the space portion 120 is supplied to the filer 130, and the hollow space 120 is filled with the slab again (S220).

If the reason for the rolling stop is terminated, the batch is rolled again (S200). If not completed, the casted slab is moved to the filer 130, (101) to continuously produce the slab.

The batch and continuous continuous rolling method of the present invention as described above can selectively perform continuous continuous rolling and batch rolling according to the casting speed of the steel type. For example, in the case where continuous casting is difficult due to a slow casting speed, such as high carbon steel, batch rolling is performed with the same system, and a steel capable of high-speed casting can perform continuous continuous rolling.

In addition, according to the present invention, it is not necessary to stop production of the casting equipment of the casting equipment even if a cause of the rolling interruption such as trouble of the rolling mill or replacement of the non-periodical roll occurs. Further, the slab is continuously produced, Maximize the use of convenience.

In the present invention, since the space 120 has a length of 20 to 30 m which can produce one coil, the tunnel heating furnace having a length of 200 to 300 m for the buffer as in the conventional patent document 1 No longer needed, the overall length of the system is dramatically reduced. In addition, the space portion 120 may be provided with a thermal cover 125 to prevent the temperature of the casting passing through it from being lowered, and it is also possible to reheat the heat to the heater 140 if necessary.

101: Caster equipment 110: Cutter
120: space part 125: thermal cover
130: Filer 135: Pusher
140: heater 150: descaler
160: rolling mill 170: cooling apparatus
180: high speed cutter 190: winder

Claims (18)

Casting equipment for producing castings;
A cutter disposed at a rear end of the performance equipment;
A rolling mill disposed at a rear end of the cutter; And
A cooling device disposed downstream of the rolling mill,
The casting equipment produces a cast steel having a thickness of 30 to 150 mm at a casting speed of 4.5 to 15 mpm,
The slab is cut to cut the slab according to the casting speed of the casting equipment to perform batch rolling and continuous continuous rolling to roll the slab produced in the casting machine directly to the rolling mill,
A space portion for feeding a casting passing through the cutter at a predetermined distance is disposed between the cutter and the rolling mill,
A heat cover configured to cover at least one surface of the cast steel to heat the cast steel being conveyed and to open the side surface thereof and a transverse type heater having a side surface opened to raise the temperature of the cast steel,
A pusher for pushing a cut slice cut by a cutter and a filer arranged to receive the cut slice on the side of the space, and a filer for cutting the cut slice cut by the pusher, And a continuous continuous rolling system. The method according to claim 1,
Wherein the rolling mill comprises a roughing mill and a finishing mill, wherein the roughing mill and the finishing mill are continuously arranged. delete delete delete The method according to claim 1,
And the space portion has a distance of 20 to 30 m. delete delete A continuous casting step of producing the cast steel;
A conveying step of conveying the slab produced in the continuous casting step at a predetermined distance; And
And a rolling step of rolling the cast steel produced in the continuous casting step,
In the conveying step, boil-heats are performed together to prevent the temperature of the casting from being lowered
Selectively performing batch rolling in which a cutting step for cutting the cast steel before the rolling step is performed and continuous continuous rolling for continuously rolling the cast steel in the continuous casting step in accordance with the casting speed produced in the continuous casting step,
And a casting process step of pulling the cast steel passing through the conveying step out of the casting conveying line after cutting and extracting the casting fed during the rolling stop from the casting conveying line,
And a cutting process step of continuously cutting the inflow slab so as to prevent interference between the inflow slab produced in the continuous casting step and the slab discharged from the moving line while the slab in the transfer step is taken out in the slab processing step . 10. The method of claim 9,
Wherein the rolling step is a continuous rolling step of rough rolling and finish rolling. delete 10. The method of claim 9,
And the weight of the casting in the conveying step is 15 to 30 t. 13. The method of claim 12,
In the conveying step, a slab of 1250 to 1300 ° C is supplied,
Wherein the casting step maintains a temperature of 1000 DEG C or higher in the conveying step. delete 10. The method of claim 9,
In the rolling step, a slab between 1000 and 1200 ° C is supplied,
Wherein the casting step maintains a temperature of 850 DEG C or higher in the rolling step. 10. The method of claim 9,
And a heating step of raising the temperature of the casting passing between the conveying step and the rolling step is performed. 17. The method of claim 16,
Characterized in that the heating step is carried out only when continuous continuous rolling is carried out which continuously rolls the casting of the continuous casting step. delete

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