KR20100078425A - System and method for endless hot rolling - Google Patents

Abstract

PURPOSE: An endless hot rolling system and a method which prevents winding errors due to the rapid cutting of an ultrathin strip is provided to reduce an equipment investment cost and remove the high speed cutter facility of the winding device. CONSTITUTION: An endless hot rolling system comprises a high-speed continuous caster facility, a roughing mill(200), a heater(400), a rolling mill(700), a winding device(900), and a cutter(600). The high-speed continuous caster facility produces the slab of the first thickness. The roughing mill rolls slab to the rolling bar of the second thickness thinning than the first thickness. The upper heating apparatus heats the rolling bar. The rolling mill rolls the heated rolling bar to the strip of the third thickness thinning than the second thickness. The winding device reels the strip. The cutter is at least arranged among the domain of the between heater and roughing mills.

Description

Continuous continuous hot rolling system and method {System and method for endless hot rolling}

The present invention relates to a continuous continuous hot rolling system and method, by continuously rolling a slab produced in a high speed performance equipment through a rough rolling facility and a finish rolling mill to produce ultra-thin hot rolled steel sheet (ie, thin film strip), The present invention relates to a continuous hot rolling system and method that can reduce production equipment costs and reduce downtime.

Recently, one of the technologies attracting attention in the field of hot rolling is continuous continuous hot rolling. This is a technique of successively performing the rolling of the slab one by one, and cutting before the winding machine to produce a product. In other words, the continuous hot rolling system has a performance and a rolling equipment at the same time.

As a conventional continuous continuous hot rolling system, a method called semi-endless is used.

1 is a schematic configuration diagram showing a conventional continuous continuous hot rolling system.

As shown in FIG. 1, the conventional continuous hot rolling system has a machine arrangement 1 arranged in a continuous manner, a first cutting device 2, a heating device 3, a pressure smoke 4, a second cutting device ( 5), the finishing rolling mill 6, the cooling device 7, the high speed cutter 8, and the winding machine 9 are provided.

The continuous continuous hot rolling method using the conventional continuous continuous hot rolling system having the above-described structure will be described with reference to FIG. 1.

In the conventional continuous hot rolling method, the slabs produced in the player equipment 10 are cut into the slab by cutting the first slab 20 by an amount that can be stored in the heating device 3. Subsequently, the long slab is wound on the winding machine 9 which is a coiler via the roughing smoke 4 and the finishing mill 6, and the cooling device rolled to the final thickness.

At this time, when the weight of the coil to be coiled reaches the target value, the strip (that is, hot rolled steel) is cut by the high speed cutter 8 located in front of the winder (9). Then, the trailing material by cutting is wound on the next winder (9). This makes it possible to continuously produce several coils in finish rolling through one long slab.

In addition, another approach that has been tried is a full endless method. In a full endless system, rolling is performed by directly connecting a player and a rolling machine. In such a full endless method, when the coil weight reaches a target value, the coil is cut by a high speed cutter, and the trailing material is wound on the next coiler.

In the conventional continuous rolling method as described above, it is basically based on continuous rolling by a high speed cutter (Shear) 8.

However, the use of high speed cutters requires very large investments, including major modifications or new installations of the peripheral winder (ie, coiler). That is, there is a disadvantage in that the cost of equipment for changing the production equipment increases.

In addition, since the thin plate (ie, strip) moving at high speed is cut with a high speed cutter, the sheet may be distorted (ie, flying) during cutting. This causes problems such as winding errors.

Therefore, the present invention is derived to solve the above problems, it is possible to omit the high-speed cutter equipment of the front end of the winder, and to arrange the cutter between the rough rolling equipment and the finish rolling mill to cut the rolling bar to reduce the equipment investment cost It is an object of the present invention to provide a continuous hot rolling system and method capable of preventing winding errors due to malfunction due to high speed cutting of ultrathin strips.

The present invention provides a high speed player equipment for producing cast steel of a first thickness; Rough rolling equipment for rolling the cast steel with a rolling bar of a second thickness thinner than the first thickness; A heating device for heating the rolled bar; A rolling mill for rolling the heated rolling bar into strips of a third thickness thinner than the second thickness; A winder for winding the strip; And a cutter disposed in at least one of the region between the rough rolling equipment and the heating apparatus and the region between the heating apparatus and the rolling mill.

The cutter cuts the rolled bar at the output end of the crude rolling equipment when the sum of the weight of the strip wound on the winder and the weight of the rolling bar between the output end of the crude rolling equipment and the input end of the winder becomes a desired weight. It is possible to cut.

The cutter cuts the rolled bar at the output end of the heating device when the sum of the weight of the strip wound on the winder and the weight of the rolled bar between the output end of the heating device and the input end of the winder is a desired weight. can do.

The rolling mill is capable of simultaneously rolling the preceding material and the following material of the cut rolling bar.

It is effective that the separation distance of the preceding material and the following material of the cut rolling bar is 0.5 to 1.5m.

A coil box positioned between the heating device and the rolling mill to wind the rolling bar, a cooling device for cooling the strip flowing into the winder, and a looper device for controlling the tension and angle of the rolling bar rolled by the rolling mill. It is preferable to include.

The looper device may change the looper control to the angle control when the trailing material of the cut rolling bar is introduced, and the looper control to the tension control after the trailing material is introduced.

The high speed player equipment, the rough rolling equipment, the heating device, the coil box, the rolling mill, the cooling device and the winding machine may be sequentially arranged in sequence.

And rolling the slab according to the present invention into a strip, winding the strip, and determining whether the weight of the wound strip and the weight of the rolled slab are equal to a target weight. , If the target weight is less than the target weight, continue rolling the slab into a strip again, and if the determination result is the same, the rolled slab is cut before the strip is formed, and the preceding material and the following material of the cut slab It provides a continuous hot rolling method for rolling at the same time.

The cast steel is produced by a high speed player, the cast steel is made of a rolling bar by a rough rolling equipment, the rolling bar is made of the strip by a rolling mill, and the rolling bar is located between the rough rolling equipment and the rolling mill. It is effective to be heated by a heating means, and the said cutting | disconnection area | region is located in the space between the said heating means and the said rough rolling installation, or the space between the said heating means and the said rolling mill.

As described above, the present invention can omit the high-speed cutter equipment at the front of the winder by cutting the rolled bar in advance according to the weight of the rolled bar and the roll wound on the winding machine, thereby reducing the equipment investment cost and reducing the thin film strip. Cutting at high speed can prevent the bending or twisting of the strip to prevent winding errors.

Further, in the present invention, the preceding material and the following material of the cut rolling bar can be heated at the same time, and also can be rolled at the same time. This allows continuous rolling to be carried out without a coil box, which reduces downtime.

In addition, the present invention can be switched between batch rolling and continuous rolling continuously to produce products of various steel grades and sizes.

Hereinafter, with reference to the accompanying drawings will be described an embodiment of the present invention in more detail. It will be apparent to those skilled in the art that the present invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, It is provided to let you know. Like numbers refer to like elements in the figures.

2 to 4 is a schematic configuration diagram of a continuous hot rolling system for explaining a system and method for performing a continuous hot rolling in accordance with an embodiment of the present invention. 5 is a schematic configuration diagram of a continuous hot rolling system for explaining a system and a method for performing continuous hot rolling according to a modification of an embodiment.

2 to 4, the continuous hot rolling system according to the present embodiment is a high speed player equipment 100 to produce a cast of a first thickness, and the cast of a second thickness thinner than the first thickness The rough rolling equipment 200 to be rolled immediately, the rough rolling side cutting machine 300 to cut the rolling bar exiting the rough rolling equipment 200, the heating device 400 for heating the rolling bar, and the Coil box 500 for winding a rolled bar, finish rolling side cutter 600 for cutting the heated rolled bar, and finish rolled mill 700 for rolling the heated rolled bar into strips of a third thickness thinner than the second thickness. ), A cooling device 800 for cooling the strip, and a winder 900 for winding the strip. Of course, it may be further provided with a looper device 1000 provided in the finishing mill 700 to control the tension. Here, each facility, device and devices are arranged in series.

The high speed player facility 100 has a ladle 110, a tundish 120 and a player 130 as shown. At this time, the molten steel is produced as a cast through the ladle 110 through the tundish 120 and the player 130.

The cast steel produced by the high speed player equipment 100 is rolled by the rough rolling equipment 200 to become a rolled bar.

The rough rolling facility 200 is provided with a rolling part provided with two rolls which rotate at least. This allows the cast piece to pass between two rotating rolls. At this time, it is possible to increase or thin the cast by applying a continuous force while gradually narrowing the gap between the rolls. That is, although the rough rolling facility 200 having three rolling parts is shown in the figure, the present invention is not limited thereto, and the rough rolling facility 200 may have fewer or more rolling parts.

By the rough rolling equipment 200 as described above, the thickness of the cast steel is reduced, and the width of the rolled bar is wider. At this time, the rolling bar is effective that the thickness is 10 to 20mm.

As described above, in the present embodiment, the cast steel produced in the high speed player device 100 is directly provided to the rough rolling facility 200. Through this, the cast steel is rolled by the rough rolling equipment 200 is produced as a rolling bar. Here, since the cast steel is heated above the rollable temperature, it is not necessary to perform separate heating. This may not be provided with a heating means for separate heating before the rough rolling facility (200). In addition, since the rough rolling facility 200 is directly provided with the cast steel, it may not be provided with a separate cutter for cutting the cast steel.

In the present embodiment, the rough rolling side cutting machine 300 is disposed at an output end of the rough rolling facility 200. Through this, the rolling bar produced by the rough rolling facility 200 may be cut.

The roughing roll-out cutter 300 has a target weight that is the sum of the weight of the strip wound on the winding machine 900 and the weight of the rolling bar between the input end of the winding machine 900 at the output end of the roughing mill 200. In this case, it is preferable to cut the rolling bar of the output end of the rough rolling equipment 200. Through this, if the total weight of the wound strip is located at the front end of the conventional winding machine 900 becomes the target weight, it is possible to omit the high-speed cutter that cut the strip. That is, a problem caused by the high speed cutter due to the pre-cutting of the steel (for example, rolling bar, strip) according to the weight of the steel (for example, rolling bar, strip) to be wound on the winding machine 900 in advance Can be prevented in advance.

That is, without cutting the strip of thin thickness moving at high speed, moving at a lower speed than this, it is possible to prevent the bending or twisting of the material to be cut during the cutting process by cutting the thicker rolling bar. And since it cuts by the desired weight in advance, it is complicated and expensive high speed cutter equipment can be skipped. Therefore, the investment cost of the continuous rolling equipment can be reduced.

The rolled bar flows into the heating device 400 and is heated to a rollable temperature. This is because the temperature is lowered as the rolling bar passes through the rough rolling facility 200. Therefore, in order to perform rolling again in the finishing mill 700 having the rolling bar disposed at the rear end, the rolling bar must be heated to a rollable temperature. Therefore, in this embodiment, it is effective to be disposed between the rough rolling equipment 200 and the finish rolling mill 700.

Here, when the rolling bar is cut by the rough rolling exit cutter 300, the preceding material and the following material may be simultaneously heated by the heating device 400. In this case, since the preceding material and the following material are continuously heated in the heating device 400, the heating capacity burden of the heating device 400 may be reduced.

The rolled bar heated as described above may be wound around the coil box 500. Through this, the rolling speed can be adjusted, and batch type rolling can be performed. Of course, this can also be done by continuously switching between batch type rolling and continuous rolling proposed in this embodiment.

This means that the continuous casting process should be stopped if the size is changed or the steel grade is changed. However, due to the coiling bar 500 is wound around the rolling bar it is possible to secure the time for the size change and steel type change. This makes it possible to freely change sizes and grades without stopping continuous casting. Of course, in the present embodiment, since the continuous casting is performed, the coil box 500 may not be used except for the above case. This means that casting can be performed continuously even when the coil box 500 breaks down.

In this embodiment, the finish rolling side cut-off 600 is disposed at an input end of the finish rolling mill 700. This may be cut just before the rolling bar is provided to the finishing mill 700.

When the finishing pressure inlet cutter 600 is the sum of the weight of the strip wound on the winding machine 900 and the weight of the rolling bar between the input end of the winding machine 900 at the output end of the heating device 400 becomes the desired weight. It is preferable to cut the rolling bar of the output end of the heating device 400. Through this, as described above, it is possible to omit the high-speed cutter that cuts the strip according to the weight by cutting in advance by the corresponding weight. The effect by this may have the same effect as the roughing roll-out cutter 300 described above. In addition, since the rolled bar is in a heated state, cutting may be further facilitated.

The rolled bar heated to a rollable temperature by the heating device 400 is rolled by the finishing mill 700 to produce a strip of thin thickness.

The finishing mill 700 has a number of rolling parts as shown in the figure. This allows you to create strips of the desired thickness. Here, it is effective that the thickness of the strip is 0.8 to 2mm.

In the present embodiment, it is effective that the looper device 1000 is disposed in the region between the rolling parts of the finishing mill 700. The looper device 1000 may absorb a sudden change in the amount of distribution of the finishing mill 700 and adjust it accordingly. That is, a part of the length of the strip rolled by the looper device 1000 may be absorbed to control its tension.

Here, if the rolling bar is cut, the preceding material and the following material may be simultaneously rolled by the finishing mill 700 as shown in FIG. 4. In other words, the tail of the preceding material and the head of the following material are simultaneously rolled by the finishing mill 700. At this time, the preceding material and the following material is preferably separated within the range of about 0.5 to 1.5m. For this separation, it is preferable to adjust the speed of the rolling parts of the finishing mill 700. That is, the rotation speed of the roller can be changed.

Alternatively, the separation distance between the preceding material and the following material may be adjusted through the aforementioned looper device 1000. Here, the looper device 1000 is changed from tension control to angle control so that the leading end portion (ie, the head) of the trailing material is smoothly blown, and adjusts the looper angle to fit the pass line. Then, after the trailing material is inserted into the next rolling part, the looper control is changed from angle control to tension control.

Since the preceding material and the following material cut in this way are simultaneously rolled in the finishing mill 700, continuous continuous rolling can be performed. If it is closer than the separation range there is a disadvantage that the subsequent winding process is difficult, if it is farther than the range there is a disadvantage that the heating load increases.

The strip produced by rolling in the finishing mill 700 is cooled by the cooling device 800 and wound by the winding machine 900. In the drawing, two winding machines 900 may be provided so that the preceding material may be wound around one winding machine 900, and the subsequent material may be wound around another winding machine 900. Of course, the present invention is not limited thereto, and a larger number of winding machines 900 may be used.

Of course, the present embodiment can be switched to the batch-type rolling through the coil box 500 located above and below as in the modification of FIG. That is, when the preceding material and the following material of the rolled bar are separated, the upper coil box 500 may wind up the preceding material, and the lower coil box 500 may wind up the trailing material, thereby preventing interruption of the continuous casting process. In addition, it is possible to secure the time required for manufacturing materials of different sizes and different sizes.

The following describes the continuous hot rolling method using the continuous hot rolling system of the present embodiment.

The continuous hot rolling system of this embodiment can operate in three modes of operation. First, as shown in FIG. 2, there is a continuous continuous rolling mode that is continuously performed from the high speed player equipment 100 to the winding machine 900 via the finishing mill 700. And, as shown in Figure 3 there is a cutting mode for cutting the rolling bar at the output end of the rough rolling equipment 200. In addition, there is a co-rolling mode in which the preceding material and the following material of the rolled bar cut as shown in FIG. 4 are simultaneously rolled in the finishing mill 700.

The following description focuses on three modes. The rolling bar is cut by the rough rolling-out cutter 300 at the output end of the rough rolling facility 200.

6 is a flowchart illustrating a continuous hot rolling method according to an embodiment.

Referring to Figure 6, first, the continuous continuous rolling mode is performed. That is, the cast steel produced in the high speed player equipment 100 is rolled into a strip through the rough rolling equipment 200, the heating device 400 and the finish rolling mill 700 (S110). Then, the strip is wound by the winder 900 (S120).

That is, the cast steel is rolled by a rolling bar in the rough rolling facility 200, and the rolling bar is heated by the heating device 400. The heated rolling bar is rolled into a strip via a finishing mill 700 and then wound into a winder 900 via a cooling device 800.

It is determined whether the sum of the weight of the strip wound on the winding machine 900 and the weight of the rolling bar between the input end of the winding machine 900 at the output end of the rough rolling facility 200 becomes a target weight (S130). .

As a result of the determination, when the weight is smaller than the target weight, the process of continuously rolling the cast steel into strips is continued.

As a result of the determination, when it is equal to the target weight, in the cutting mode, the rolling bar of the output end of the rough rolling equipment 200 is cut (S140). That is, the rolling bar between the rough rolling facility 200 and the heating apparatus 400 is cut | disconnected. Due to this cutting, the rolled bar is separated into a preceding material and a following material.

Then, it is preferable to space the distance between the preceding material and the following material.

Thereafter, the leading material tail and the trailing material head of the rolling bar are simultaneously heated by the heating device 400. In the simultaneous rolling mode, the preceding material and the following material of the rolling bar are simultaneously rolled by the finishing mill 700 to generate a strip (S150).

Subsequently, the strip corresponding to the preceding material is wound on the present winder 900. Subsequently, the strip corresponding to the trailing material discharged subsequently is wound into a new winder 900. The preceding continuous rolling mode is then performed on the strip corresponding to the trailing material. This allows continuous continuous rolling to be performed without interruption of the process.

In this embodiment, the preceding and trailing agents of the rolled bar cut as necessary may be wound on the coil box 500. Then, the rolling bar wound in the form of a coil may be provided to the finishing mill 700 while being unwound.

Although the invention has been described with reference to the accompanying drawings and the preferred embodiments described above, the invention is not limited thereto, but is defined by the claims that follow. Accordingly, one of ordinary skill in the art may variously modify and modify the present invention without departing from the spirit of the following claims.

1 is a schematic configuration diagram showing a conventional continuous continuous hot rolling system.

2 to 4 is a schematic configuration diagram of a continuous hot rolling system for explaining a system and method for performing a continuous hot rolling in accordance with an embodiment of the present invention.

5 is a schematic configuration diagram of a continuous hot rolling system for explaining a system and method for performing continuous hot rolling according to a modification of the embodiment;

6 is a flowchart illustrating a method of continuous hot rolling in accordance with an embodiment.

<Explanation of symbols for main parts of the drawings>

1, 100: player 2, 5, 8, 300, 600: cutter

3, 400: heating device 4, 200: rough rolling equipment

6, 700: rolling mill 7, 800: cooling unit

9, 900: winding machine 500: coil box

1000: looper device

Claims (10)

A high speed player equipment producing cast steel of a first thickness; Rough rolling equipment for rolling the cast steel with a rolling bar of a second thickness thinner than the first thickness; A heating device for heating the rolled bar; A rolling mill for rolling the heated rolling bar into strips of a third thickness thinner than the second thickness; A winder for winding the strip; And And a cutter disposed in an area between at least one of the region between the rough rolling facility and the heating device and the region between the heating device and the rolling mill. The method according to claim 1, The cutter cuts the rolled bar at the output end of the crude rolling equipment when the sum of the weight of the strip wound on the winder and the weight of the rolling bar between the output end of the crude rolling equipment and the input end of the winder becomes a desired weight. Continuous hot rolling system to cut. The method according to claim 1, The cutter cuts the rolled bar of the output end of the heating apparatus when the sum of the weight of the strip wound on the winder and the weight of the rolled bar between the input end of the winder and the output end of the heating apparatus becomes a target weight. Continuous hot rolling system. The method according to claim 2 or 3, The rolling mill is a continuous hot rolling system for rolling the preceding material and the following material of the cut rolling bar at the same time. The method according to claim 4, Continuous distance hot rolling system of the preceding material and the trailing material of the cut rolling bar is 0.5 to 1.5m. The method according to claim 1, A coil box positioned between the heating device and the rolling mill to wind the rolling bar; A cooling device for cooling the strip flowing into the winder; Continuous loop rolling system further comprises a looper device for controlling the tension and angle of the rolling bar is rolled by the rolling mill. The method according to claim 6, And the looper device changes the looper control to angle control when the trailing material of the cut rolling bar is introduced, and changes the looper control to tension control after the trailing material is introduced. The method according to claim 6, A continuous continuous hot rolling system in which said high speed player equipment, a rough rolling equipment, a heating device, a coil box, a rolling mill, a cooling device, and said winding machine are sequentially arranged in sequence. Rolling the slabs into strips; Winding the strip; Determining whether the weight of the wound strip and the weight of the rolled slab are equal to a target weight; If the determination result is less than the target weight, the step of continuing to roll the cast slab into strips, If the determination result is the same, the rolled slab is cut before forming the strip, and the continuous and continuous rolling method for rolling the preceding material and the following material of the cut slab at the same time. The method according to claim 9, The cast steel is produced by a high speed player, the cast steel is made of a rolling bar by a rough rolling equipment, the rolling bar is made of the strip by a rolling mill, and the rolling bar is located between the rough rolling equipment and the rolling mill. Heated by heating means, And said cutting region is located in a space between said heating means and said rough rolling equipment or a space between said heating means and said rolling mill.

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