JP2932419B2 - Twin roll continuous casting and rolling equipment and twin roll continuous casting and rolling method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a twin-roll continuous casting and rolling plant, and more particularly, to a twin-roll continuous casting and rolling plant and a twin-roll continuous casting and rolling plant capable of performing casting and rolling of slabs in a consistent line. To a continuous casting and rolling method using the same.

[0002]

2. Description of the Related Art Conventionally, in this type of twin-roll continuous casting and rolling equipment, a continuous casting line and a rolling line are integrated lines. However, in the twin-roll continuous casting machine, the amount of heat absorbed by the rolls is limited, and it has been difficult to increase the line speed of continuous casting. Further, the leading end of a continuous cast slab by a continuous caster needs to be read by a dummy sheet or a dummy bar, and in a continuous casting line, an intermittent operation is forced.

[0003] On the other hand, the rolling line has more processing capacity than the line speed of the continuous casting line, and it is possible to increase the line speed than the continuous casting line. For this reason, as in the conventional twin-roll continuous casting and rolling equipment, in an equipment in which a continuous casting line including one twin-roll continuous casting machine and a rolling line are integrated, the rolling material production capacity as a whole is double. It depends on the production capacity of the roll continuous casting machine, and it has been extremely difficult to improve the productivity.

[0004] Further, when the rolling line is stopped due to a failure or the like, the entire equipment including the casting line must be stopped.

[0005] Further, in order to improve the material of the slab,
It is necessary to perform adiabatic holding to precipitate sulfide (MnS) and the like, but this requires a certain period of time, and here, too, the casting of the slab into the rolling line has been delayed.

In order to avoid these inconveniences, there is a coil box type cremona furnace having a buffer function, but it has not been possible to improve the production capacity of the entire line.

[0007] In some cases, sulfide (MnS) precipitation is promoted by maintaining heat insulation at the outlet side temperature of the continuous casting machine to improve the material of the slab. In this case, too, the production capacity of the entire line is increased. Could not be improved.

[0008]

As described above, in the conventional twin-roll continuous casting and rolling equipment, the production capacity of the rolling line provided at the subsequent stage of the continuous casting line exceeds the production capacity of the continuous casting line. The overall production capacity is strongly dependent on the production capacity of the continuous casting line. However, there is a limit to the production capacity of the continuous casting line, and there is a problem that it is difficult to increase the production capacity of the entire facility beyond the present level by using the conventional twin-roll continuous casting and rolling equipment.

In order to improve the quality of the slab to be manufactured, a predetermined heat-insulating holding time, for example, 60 seconds at 1100 ° C., is required. There has been a problem that it is difficult to perform it efficiently.

[0010] The present invention has been proposed in view of the above-mentioned problems of the prior art. It is an object of the present invention to improve the production capacity of the entire equipment and to improve the material of the slab. It is an object of the present invention to provide a twin-roll continuous casting and rolling equipment capable of performing the above.

[0011]

In order to achieve the above object, according to the first aspect of the present invention, at least two or more twin-roll continuous casting lines and at least two or more twin-roll continuous casting lines are provided for each twin-roll continuous casting line. Provided, while winding the slab cast by the twin-roll continuous casting line, and a reel that pays out the wound slab toward the rolling line, and selectively switching the reel, the twin-roll continuous casting line A switching device for winding the slab, moving the reel on which the slab is wound to a rolling line, and discharging the slab from the reel toward the rolling line is provided.

According to a second aspect of the present invention, in the twin roll continuous casting and rolling facility of the first aspect, a heating furnace is provided between the reel and the rolling line.

According to a third aspect of the present invention, in the twin roll continuous casting and rolling plant of the first or second aspect, the continuous casting line is covered with a non-oxidizing heat-insulating seal box, and the reel is covered with a heat-insulating seal box. It is characterized by having.

[0014] In the invention according to claim 4, a slab cast by a twin-roll continuous casting line provided with at least two or more lines is subjected to at least two twin-roll continuous casting lines.
After selectively winding the reel provided with the base or more with the switching device and moving the reel on which the slab has been wound to the rolling line while selectively switching the reel with the switching device, the slab is moved toward the rolling line. It is characterized by paying out.

According to a fifth aspect of the present invention, in the twin roll continuous casting and rolling method according to the fourth aspect, the slab discharged from the reel toward the rolling line is heated by a heating furnace.

According to a sixth aspect of the present invention, in the continuous casting and rolling method according to the fourth or fifth aspect, the continuous casting line is formed in a non-oxidized state by the non-oxidized heat-insulating seal box.
In addition, the reel is placed in a heat-insulating state by a heat-insulating seal box, and the wound slab is held in a heat-insulating state.

[0017]

Since the present invention has the above-described structure, it operates as follows. According to the first or fourth aspect of the present invention, the slabs are cast by twin roll continuous casting lines provided with at least two or more lines. The slab is wound on at least two or more reels provided for each twin-roll continuous casting line. Each reel is selectively switched by a switching device to wind the slab. The reels on which the slabs have been wound for each twin-roll continuous casting line are selectively switched by the switching device, and the slabs are discharged toward the rolling line.

Therefore, in each twin-roll continuous casting line, since there are at least two or more reels for winding the slab, the switching device can be used to switch the reel for winding the slab, The slab can be dispensed to the line from any of the reels on which the slab has been wound. For this reason, a plurality of reels play a role of a buffer between the twin roll continuous casting line and the rolling line, fully utilizing the production capacity of the rolling line,
Continuous casting and rolling can be performed with high efficiency.

In the invention according to claim 2 or 5,
The slab discharged from the reel toward the rolling line is heated by a heating furnace. Therefore, the slab can be discharged to the rolling line while maintaining the temperature according to the material of the slab to be produced. For this reason, it is possible to improve the quality of the cast slab to be produced.

According to the third or sixth aspect of the present invention,
The continuous casting line is kept in a non-oxidized and heat-insulated state by the non-oxidized heat-insulating seal box, the reel is put in the heat-insulated state by the heat-insulating seal box, and the wound slab is held insulated. Accordingly, it is possible to prevent the yield from being reduced due to the generation of the surface scale of the cast slab and the generation of flaws caused by the scale. In addition, since the slab can be thermally insulated and held using the buffer function of the reel, sulfide can be efficiently precipitated, and the quality of the slab to be produced can be further improved.

[0021]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 5 show a first embodiment of a twin-roll continuous casting and rolling facility according to the present invention. 1 is a side view showing a schematic configuration of a twin-roll continuous casting and rolling facility, FIG. 2 is a plan view of the twin-roll continuous casting and rolling facility shown in FIG. 1, FIG. 3 is a cross-sectional view of a reel and a switching device, and FIG. FIG. 5 is a side view showing the reel and the device near the entrance (casting machine side) of the reel, and FIG. 5 is a side view showing the reel and the device near the exit side (rolling machine side) of the reel.

The twin-roll continuous casting and rolling equipment includes two continuous casting lines 1a and 1b provided side by side and a rolling line 2 connected to the continuous casting lines 1a and 1b.
Consists of As shown in FIG. 2, the positional relationship between the continuous casting lines 1a and 1b and the rolling line 2 is such that the center of the rolling line 2 is located at the center in the longitudinal direction, and the left and right sides of the center of the rolling line 2 are continuously cast. The center of the line 1a, 1b is located. In this embodiment,
The first casting line (1C
C) 1a is provided, and a second casting line (2CC) 1b is provided on the right side toward the rolling line 2.

The continuous casting line 1 has substantially the same structure as the existing continuous casting line, and includes a pinch roll 4, a soaking panel (soaking roll) 5, a shear 6, a deflector pinch roll 7 from a twin roll continuous casting machine 3. , Switching pinch roll 8
After that, the reel 9 is communicated. The continuous casting line 1 is covered with a non-oxidizing and heat-insulating seal box 10.

A heating furnace 11 is provided on the downstream side of the reels 9. The slab that has passed through the heating furnace 11 is guided to a rolling mill 13 via a dancer looper 12, rolled, and then cooled. It is quenched by the apparatus 14, and further, the re-heat treatment apparatus 15,
After passing through the cooling zone 16 and the like, it is wound up by the coiler 17.

The reels 9 connected to the continuous casting line 1 are composed of high-temperature mandrels. As shown in FIG. 3 to FIG.
The reels 9a and 9b can be moved between the continuous casting line 1 and the rolling line 2 by the reel switching devices 18 and 18.

The reels 9a and 9b are covered with a heat insulating seal box 19. As shown in FIG. 3, the heat insulating seal box 19 includes left and right lower reels 9b, 9b.
Lower heat-insulating seal boxes 19b, 19b respectively covering
And upper heat-insulating seal boxes 19a, 19a that respectively cover the upper and lower reels 9a, 9a, are provided facing each other.
Opposite left and right lower heat-insulating seal boxes 19b, 19b
And the left and right upper heat-insulating seal boxes 19a, 19a
Each has a structure that can slide left and right.

The reel shaft 20 of the above-mentioned reels 9a and 9b
Has a universal joint 21
And the motor 29 communicates via the speed reducer 22,
By rotating the reels 9a and 9b to take up a slab,
You can pay it out.

A mandrel shift device 23 is connected to the reel shaft 20 of the reels 9a and 9b and the heat-insulating seal boxes 19a and 19b. The mandrel shift device 23 has a traveling device 25 capable of traveling on a mandrel support rail 24, and the reels 9a, 9b
Can be moved in the left-right direction together with the heat-insulating seal boxes 19a, 19b. The above-mentioned mandrel shift device 23, mandrel support rail 24, traveling device 2
5 and the like function as the switching device 18.

Further, only the reels 9a and 9b are located in the heat insulating seal box 19, and the switching device 18 and the speed reducer 22
Are out of the heat-insulating seal box 19, so that the members such as the switching device 18 and the speed reducer 22 are not affected by heat, so that the durability of these devices is improved and maintenance is easy. Becomes

FIG. 3 shows a state in which the slab cast on the lower reel 9b of the first continuous casting line 1a is wound up, and the slab wound on the upper reel 9a is discharged toward the rolling line 2, and the second continuous casting line 1b This shows a state in which the slab cast by the upper reel 9a is taken up, and the lower reel 9b having finished winding the slab is kept at the standby position to perform heat insulation holding of the slab. In FIG. 3, the second continuous casting line 1b
The mandrel shift device and the like, which are switching devices, are not shown because they are symmetrical to those of the first continuous casting line 1a.

In this state, when the casting of the slab by the upper reel 9a of the first continuous casting line 1a is completed, the upper reel 9a is returned to the center line of the first continuous casting line 1a by the mandrel shift device 23, The lower reel 9b of the second continuous casting line 1b, which has been insulated and held at the standby position, is shifted onto the center line of the rolling line 2 by a mandrel shift device (not shown), and the slab is moved toward the rolling line 2. Pay out. When the winding of the slab by the lower reel 9b of the first continuous casting line 1a is completed, the winding of the slab by the upper reel 9a starts,
The lower reel 9b waits at the standby position, and enters into the heat insulation holding of the slab.

The winding and dispensing of the slab described above
This will be described in more detail with reference to FIGS. FIG. 4 shows a state in which the slab is taken up by the upper reel 9a and the slab is paid out by the lower reel 9b. In FIG. 5, the slab is taken up by the lower reel 9b and the slab is paid out by the upper reel 9a. It shows the state where it is.

The slabs cast on each of the continuous casting lines 1a and 1b are sent out by a pinch roll 4 or the like, and are heated to a predetermined temperature, for example, about 1100 ° C. by a soaking panel (soaking roll) 5. The temperature is adjusted uniformly. Then, while being further fed by the pinch roll 4, it reaches the deflector pinch roll 7, and the winding position is switched by the up / down switching pinch roll 8,
It is wound by the reels 9a and 9b. When the tip of the slab is wound, the tip of the slab is guided to the reel 9 by the winding guide 26.

Between the twin-roll continuous casting machines 3a, 3b and the reels 9a, 9b, a non-oxidized heat-insulating seal box 10 is provided.
And the oxygen concentration is 0.1% or less,
It is heat-insulated and sealed so that the ambient temperature is about 1100 ° C. Further, the inside of the heat-insulating seal box 19 covering the reels 9a and 9b is heat-insulated and sealed such that the slab temperature is about 1000 ° C and the ambient temperature is about 1000 ° C.

The cast pieces wound on the reels 9a and 9b are:
It is heat-insulated and held at a standby position in the heat-insulating seal box 19. This heat retention is achieved by converting the sulfur in the slab to sulfide (MnS).
This is a process for improving the workability of the cast slab by precipitating as, and requires at least 60 seconds under the condition of 1100 ° C or more. For example, when casting and rolling a slab having a thickness of 1.5 mm, a casting speed of 140 mpm and a casting time of 12.4 minutes are required, and switching between the reels 9a and 9b requires 1 minute. If it is 2 minutes, the waiting slab has a switching time of 1 minute and a rolling time of 4.2.
Insulation can be maintained for 5.2 minutes, which is a total of minutes. When casting and rolling a slab having a thickness of 6 mm,
It becomes possible to secure a heat insulation holding time of about 10 minutes.

The slab that has been wound up on the reels 9a and 9b and has been kept insulated is passed through a pinch roll 27 to the heating furnace 1
It is led to 1. The heating furnace 11 is a furnace for raising the temperature of the slab that has dropped during the heat insulation to the temperature required for rolling. In the present embodiment, the induction furnace having an output of 10 MW and a length of 10 m is used. It consists of a heating furnace. While passing through the induction heating furnace (heating furnace 11), the slab is heated from about 1000 ° C. to about 1
The temperature is raised to 200 ° C., and is guided to the rolling mill 13 via the transport rolls 28 and rolled.

FIGS. 6 to 10 show another embodiment of the twin roll casting and rolling equipment according to the present invention, in which four twin roll continuous casting lines are provided, and reels are arranged in two rows on the right and left and three rows on the upper and lower sides. Six are provided. 6 is a side view showing a schematic configuration of a twin-roll continuous casting and rolling facility, FIG. 7 is a plan view of the twin-roll continuous casting and rolling facility shown in FIG. 6, and FIG. 8 is a reel and devices near the entrance and the exit of the reel. FIG. 9 is a side view showing the positional relationship when switching reels are independently arranged on the output side of four twin-roll continuous casting machines, and FIG.
0 is a transverse sectional view of the reel and the switching device. The same members as those in the above-described first embodiment are denoted by the same reference numerals, and description thereof is omitted.

This twin-roll continuous casting and rolling plant has two continuous casting lines arranged side by side in the front and back, and two continuous casting lines arranged side by side to form a continuous casting line 100a having a total of four lines. , 100b, 100
c, 100d, and these continuous casting lines 100
The rolling line 2 is connected to a, 100b, 100c, and 100d.

The continuous casting lines 100a, 100b, 10
As shown in FIG. 7, the center of the rolling line 2 is located at the center in the longitudinal direction, and the center of the rolling line 2 is located on the left and right sides of the rolling line 2. Casting lines 100a, 100b
And the center of the continuous casting lines 100c and 100d. In the present embodiment, the first continuous casting line (1CC) 100
a and a second continuous casting line (2CC) 100b.
On the right side of the rolling line 2, a third continuous casting line (3CC) 100c and a fourth continuous casting line (4CC) 1
00d.

FIG. 8 is a side view of the vicinity of the reel and the switching device in detail showing the state of winding and unwinding the cast slab in FIG.
c shows a state in which the slab is wound up and the slab is paid out by the middle reel 101b, and the shears 6 and the deflector pinch rolls 7 in the first embodiment described above.
The upper and lower switching pinch rolls 8 and the like are provided in two upper and lower systems, and are switched between a reel for taking up a cast piece and a reel for paying out.

When the slab is dispensed, the slab is guided by the up-down switching discharge guide roll 104, guided by the up-down switching discharge guide 105, passes through the deflector pinch roll 27, and reaches the rolling line 2.

Also, reels 101a provided in three stages, upper and lower,
As another embodiment of the positional relationship between 101b and 101c, as shown in FIG.
From (100c, 100d) to the rolling line 2,
Lower reel 101c, middle reel 101b, upper reel 101
The installation positions may be shifted in the order of a. In this case, as shown in FIG. 10, these reels 101 are an upper reel 101a, a middle reel 101b, and a lower reel 101c.
Independent heat-insulating seal boxes 102a, 102
02b and 102c. The heat-insulating seal boxes 102a, 102b, 102c are composed of slide boxes facing left and right, and upper plates of the respective slide boxes are slidably overlapped.

Each of the reels 101a, 10a
A motor 29 is connected to the reel shaft 103 of each of the reels 101a, 101b, 101c via an extendable universal joint 21 and a speed reducer 22.
By rotating 01c, the slab can be wound up or paid out.

The reels 101a, 101
A mandrel shift device 23 is in communication with the reel shaft 103 and the heat insulating seal boxes 102a, 102b, 102c of b, 101c. This mandrel shift device 2
3 can run on the mandrel support rail 24, and can move the reels 101a, 101b, 101c in the left-right direction together with the heat-insulating seal boxes 102a, 102b, 102c. The switching device 18 is configured by the mandrel shift device 23 and the mandrel support rail 24.

FIG. 10 shows a case where the slab cast on the first continuous casting line 100a is wound on the lower left reel 101c, and the slab cast on the second continuous casting line 100b is wound on the upper left reel 101a. 100a or the second continuous casting line 100b, the slab is taken out from the middle left reel 101b which has taken up the slab toward the rolling line 2, and the third continuous casting line 1
Winding the slab cast at 00c, the upper right rail 101a
The right middle reel 1 which winds the slab cast in the fourth continuous casting line 100d and finishes winding the slab cast in the third continuous casting line 100c or the fourth continuous casting line 100d.
01b shows a state where the heat insulation is maintained. In FIG. 10, the third continuous casting line 100
c and a mandrel shift device which is a switching device of the fourth continuous casting line 100d are connected to the first continuous casting line 100a.
Since it is symmetrical to that of the second continuous casting line 100b, illustration is omitted.

[0046]

Since the present invention has the above-described structure,
The following effects can be obtained.

In the first or fourth aspect of the present invention,
Cast slabs are cast by a twin-roll continuous casting line provided with at least two or more lines, and the cast slabs are wound on at least two or more reels provided for each twin-roll continuous casting line. The reel can be selectively switched by the switching device to take up the slab.
And the reel which has taken up the slab for each twin-roll continuous casting line is selectively switched by the switching device,
The slab can be discharged to the rolling line.

That is, in each twin-roll continuous casting line, since there are at least two or more reels for winding the slab, the switching device can be used to switch the reel for winding the slab, The slab can be dispensed to the line from any of the reels on which the slab has been wound.

Accordingly, the plurality of reels serve as a buffer between the twin-roll continuous casting line and the rolling line, and the rolling capacity is not restricted by the production capacity of the twin-roll continuous casting line, but the production capacity of the entire line is limited. By fully utilizing the production capacity of the line, it is possible to perform continuous casting and rolling with high efficiency.

Further, since there are two or more twin roll continuous casting lines, when manufacturing small slabs of various types (different steel types and different widths), investment costs for equipment are reduced and productivity is reduced. It can be improved.

In the second or fifth aspect of the present invention,
Since the slab to be dispensed from the reel to the rolling line is heated by the heating furnace, the slab can be dispensed to the rolling line while maintaining the temperature according to the material of the slab to be produced. Therefore, it is possible to improve the quality of the cast slab to be produced.

According to the third or sixth aspect of the present invention,
The reel is placed in a heat-insulating state by a heat-insulating seal box, and the wound slab is held in a heat-insulating state. Therefore, the slab can be insulated and held using the buffer function of the reel, so that the sulfide can be efficiently precipitated and the generation of scale can be suppressed. Can be further improved.

[Brief description of the drawings]

FIG. 1 is a side view showing a schematic configuration of a twin-roll continuous casting and rolling facility.

FIG. 2 is a plan view of the twin-roll continuous casting and rolling facility shown in FIG.

FIG. 3 is a cross-sectional view of a reel and a switching device.

FIG. 4 is a side view showing a reel and devices near the entry side (casting machine side) of the reel.

FIG. 5 is a side view showing a reel and devices in the vicinity of a delivery side (rolling mill side) of the reel.

FIG. 6 is a side view showing a schematic configuration of a twin-roll continuous casting and rolling facility.

FIG. 7 is a plan view of the twin-roll continuous casting and rolling facility shown in FIG. 6;

FIG. 8 is a side view showing the reel and devices near the entrance and exit sides of the reel.

FIG. 9 is a side view showing a positional relationship when switching reels are independently arranged on the output side of four twin-roll continuous casting machines.

FIG. 10 is a cross-sectional view of a reel and a switching device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Continuous casting line 1a 1st continuous casting line 1b 2nd continuous casting line 2 Rolling line 3 Twin roll continuous casting machine 4 Pinch roll 5 Equalizing panel (Equalizing roll) 6 Shear 7 Deflector pinch roll 8 Switching pinch roll 9 Reel 9a Upper reel 9b Lower reel 10 Non-oxidizing heat-insulating seal box 11 Heating furnace 12 Dancer looper 13 Rolling machine 14 Cooling device 15 Reheater 16 Cooling zone 17 Coiler 18 Reel switching device 19 Heat-insulating seal box 19a Upper heat-insulating seal box 19b Lower heat-insulating seal Box 20 Reel shaft 21 Universal joint 22 Reduction gear 23 Mandrel shift device 24 Mandrel support rail 25 Traveling device 26 Take-up guide 27 Deflector pinch roll 28 Transport roll 29 Motor 100 continuous Casting line 100a First continuous casting line 100b Second continuous casting line 100c Third continuous casting line 100d Fourth continuous casting line 101 reel 101a Upper reel 101b Middle reel 101c Lower reel 102 Insulated seal box 102a Upper insulated seal box 102b Medium insulated seal Box 102c Lower insulation seal box 103 Reel shaft 104 Up / down switching payout guide roll 105 Up / down switching payout guide

Continuation of the front page (51) Int.Cl. ⁶ identification symbol FI B21C 47/02 B21C 47/02 B B22D 11/06 330 B22D 11/06 330B (58) Investigated field (Int.Cl. ⁶ , DB name) B22D 11/00-11/22 B21C 45/00-49/00

Claims (6)

(57) [Claims] 1. A twin-roll continuous casting line having at least two or more twin-roll continuous casting lines, and at least two or more twin-roll continuous casting lines are provided for each of the twin-roll continuous casting lines. A reel for paying out the slab to the rolling line, and selectively switching the reel, winding the slab in the twin-roll continuous casting line, and moving the reel from which the slab is wound to the rolling line. And a switching device for discharging the slab from the reel toward the rolling line. 2. The twin-roll continuous casting and rolling plant according to claim 1, wherein a heating furnace is provided between the reel and the rolling line. 3. The twin-roll continuous casting and rolling plant according to claim 1, wherein the continuous casting line is covered with a non-oxidizing heat-insulating seal box, and the reel is covered with a heat-insulating seal box. Twin roll continuous casting and rolling equipment. 4. A slab cast by a twin roll continuous casting line provided with at least two or more lines is wound while selectively switching at least two reels provided by a switching device for each twin roll continuous casting line. Take
A twin-roll continuous casting and rolling method, comprising transferring a slab to a rolling line while selectively switching a reel on which a slab has been wound by a switching device, and then discharging the slab to the rolling line. 5. The twin-roll continuous casting and rolling method according to claim 4, wherein the slab discharged from the reel toward the rolling line is heated by a heating furnace. 6. The continuous casting and rolling method according to claim 4 or 5, wherein the continuous casting line is kept in a non-oxidizing state by the non-oxidizing and heat-insulating seal box, and the reel is insulated by the heat-insulating sealing box. A continuous casting and rolling method, wherein the cast slab is heat-insulated.