JPH11123453A - Hot rolling equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To conduct stabilized finish rolling even in endless rolling, in which a high slab heating temp. is not set and in the case of finish rolling at a prescribed temp. state uniformly set in the longitudinal direction, that is, rolling of a thin product, etc. SOLUTION: In the hot rolling equipment in which a bar joining device 15 to join a tail part of a preceding sheet bar and a tip part of a succeeding sheet bar is arranged between a rough rolling mill 1 and a finish rolling mill 2 and finish rolling is continuously conducted, a coiling/uncoiling device 13, which transiently takes up/stands by the sheet bar, is arranged between the rough rolling mill 1 and the bar joining device 15 and a bar heater 5 capable of heating a whole width direction of the sheet bar is arranged at an inlet side of the finish rolling mill 2. Further, an edge heater 6 to heat a width direction edge part of the sheet bar is arranged at an inlet side of the finish rolling mill 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot rolling facility for continuously performing finish rolling.

[0002]

2. Description of the Related Art Heretofore, a so-called batch rolling operation has been performed in which finish rolling is performed for each rough-rolled sheet bar. However, in recent years, in order to produce steel strips such as thin ones,
The so-called endless rolling operation, in which the leading and trailing materials are repeatedly joined and welded between the rough rolling mill and the finishing rolling mill, and the leading and trailing materials are successively finish-rolled. Is being done.

[0003] In the hot rolling equipment in which such an endless rolling operation is performed, a subsequent sheet bar is temporarily wound between the rough rolling mill and a bar joining device for performing the joining. Is installed.
This winding and rewinding device temporarily stores the roughly-rolled succeeding sheet bar in a coil state, and adjusts the timing of the trailing end of the preceding material to the succeeding sheet bar in accordance with the timing of passing through the bar joining device. The following sheet bar is operated to be fed so that the leading end can pass through the bar joining device.

In this endless rolling operation, since the finish rolling can be continuously performed in a state where the preceding material and the following material are connected, there is no unsteady portion at the leading end of each sheet bar unit unlike the batch rolling, so that the endless rolling is performed. The finish rolling can be stably performed over the entire length of the rolled material, and has an advantage that it is particularly suitable for rolling of a material to be rolled in which it is difficult to pass an unsteady portion such as rolling of a thin material.

[0005]

However, in the above-mentioned endless rolling operation, a time for joining and a time for waiting in a winding and rewinding device are required, and the sheet bar from the end of rough rolling to the start of finish rolling is required. Has a problem that the temperature drop becomes larger than that of batch rolling.

[0006] Further, unlike a looper in cold rolling, the winding and rewinding device has an advantage that heat dissipation is extremely small, but the innermost winding portion (tail end portion) and the outermost winding portion of the coil. As for the winding part (tip part), since it is in contact with the mandrel and the atmosphere, the heat dissipation is larger than that of the stationary part (central part), and as shown in FIG. 7, the innermost winding part and the outermost winding part But, than the stationary part (the central part in the longitudinal direction),
For example, the temperature drops by 30 to 50 ° C. If such a temperature drop occurs, the target temperature at the time of finishing rolling cannot be achieved.

[0007] For this reason, conventionally, in the endless rolling operation, there is a problem that the heating temperature of the slab in the heating furnace must be set high in consideration of the temperature drop due to the conveyance from the end of the rough rolling to the start of the finish rolling. there were.

However, if the heating temperature of the slab is set high, the equipment such as refractories in the heating furnace will be severely damaged, and the number of repairs by stopping the operation will increase, thus increasing the repair cost and operating the equipment. There is a problem that time is shortened and production capacity is reduced. Further, increasing the slab heating temperature is not preferable from the viewpoint of fuel cost.

Even if the slab heating temperature is set high, once the winding is performed by the winding and rewinding device, the temperature of the innermost winding portion and the outermost winding portion is lower than that of the steady portion. The temperature is not uniform in the longitudinal direction. As a result, a partial variation in the finish rolling load occurs, and phenomena such as a disorder in the shape of the material to be rolled also occur. Particularly in the rolling of a thin material, such a temperature disturbance tends to cause a rolling trouble.

That is, in the rolling of a thin material having a thickness of 1.2 mm or less, it is necessary to set a low passing speed on the entry side of the finish rolling, so that the temperature drop of the sheet bar tends to increase, and the finishing rolling load is reduced. In some cases, the degree of shape disturbance due to the fluctuation becomes severe, and such a temperature disturbance tends to cause a rolling trouble. For this reason, the thickness of the thin object may be limited from such a viewpoint.

The present invention has been made in view of the above-mentioned problems. Even when the endless rolling operation is performed, the slab heating temperature is not set high and the slab is made uniform in the longitudinal direction. It is an object of the present invention to provide a hot rolling facility capable of performing stable finish rolling even in a finish rolling at a predetermined temperature state, that is, a rolling operation of a thin material or the like.

[0012]

In order to solve the above-mentioned problems, the hot rolling equipment according to the first aspect of the present invention comprises a first sheet bar between a rough rolling mill and a finishing rolling mill. A bar joining device for joining the tail end of the sheet bar and the leading end of the succeeding sheet bar is provided, and a hot rolling facility for continuously performing finish rolling, wherein the rough rolling mill and the bar joining device Between the bar joining device and the finishing mill, a bar heating device capable of heating the entire width of the sheet bar is provided, between the bar joining device and the finishing mill. Is provided.

According to the present invention, the following material is made to stand by in a coil state by the winding and rewinding device, so that the heat dissipation of the following material is suppressed and the temperature drop of the entire sheet bar is reduced. Further, even if the temperature drop exceeding the allowable range occurs in the whole or a part of the sheet bar, the temperature can be compensated by heating the entire sheet bar in the width direction by the bar heating device.

Next, the invention according to claim 2 is different from the structure according to claim 1 in that, apart from the bar heating device,
An end heating device for heating an end portion in the width direction of the sheet bar is provided on the entry side of the finishing mill.

In the process of transporting from rough rolling to finish rolling, not only the thin material, but also a large temperature drop occurs at the end in the sheet width direction compared to the center in the sheet width direction. Thereby, temperature compensation of the end portion in the plate width direction can be performed. As a result, the temperature distribution not only in the longitudinal direction but also in the plate width direction can be easily made uniform.

Next, according to a third aspect of the present invention, in the configuration according to the first or second aspect, the bar joining device and the bar heating device are disposed between the bar joining device and the bar heating device. It is characterized by comprising a joint detecting means for detecting a joint between the sheet bars, and a controller for controlling heating of the sheet bar by the bar heating device based on the detection by the joint detecting means.

In the longitudinal direction, the temperature drop of the sheet bar is large at the leading end and the tail end of the sheet bar. According to the present invention, the joining portion is detected by the joining portion detecting means, that is, the leading end of the sheet bar. In addition, the position of the tail end is detected, and the temperature of the front end and the tail end of the sheet bar can be reliably compensated.

Next, according to a fourth aspect of the present invention, there is provided a temperature sensor disposed on the entrance side of the bar heating device for detecting the temperature of the sheet bar, in addition to the configuration of the first or second aspect. And a controller for controlling the heating of the sheet bar by the bar heating device so that the temperature detected by the temperature sensor becomes a predetermined target value.

In the present invention, the presence / absence of heating and the temperature are controlled by feedforward control based on the temperature change of the sheet bar, so that the temperature in the longitudinal direction of the sheet bar can be made uniform to a desired temperature.

Note that the above control includes setting a threshold value of the target temperature range and performing a heating process only when the threshold value is deviated. Next, the invention described in claim 5 is characterized in that the bar heating device is a device that performs heating by induction heating, with respect to the configuration described in any one of claims 1 to 4. It is.

When the bar heating device is of the induction heating type, the temperature control of the heating becomes easy and the heating time to the predetermined temperature can be shortened. Next, the invention described in claim 6 is characterized in that, in the configuration described in any one of claims 1 to 5, the bar heating device is arranged close to the entrance of the finishing mill. Is what you do.

Here, the bar heating device is preferably arranged as close as possible to the finish rolling mill entry side as much as possible while avoiding interference with unavoidable equipment at the finish rolling mill entry side. .

In the above-mentioned endless rolling operation, a plurality of sheet bars can be joined and finish rolling can be continuously performed. When biting into the finishing mill,
The operation mode is the same as the above-described batch rolling. That is,
Until the end of the first sheet bar reaches the finish rolling mill entry side, it may be desirable to minimize the temperature drop due to heat dissipation, and the sheet bar is conveyed at a speed as high as possible. Then, at the time when the tip reaches the finishing mill entry side, the transport speed is reduced to a threading speed at which the tip can pass through the finishing mill. Therefore, by arranging the bar heating device close to the finish rolling mill entry side, the speed of passing through the bar heating device can be reduced without lowering the rolling efficiency, which is advantageous for heating. Become.

In addition, by decelerating, the up-and-down movement (bounce) of the sheet bar passing through the inside of the bar heating device is suppressed, and the possibility that the sheet bar comes into contact with the bar heating device is reduced.

[0025]

Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a hot rolling equipment row showing one example of the present embodiment. Reference numeral 1 denotes a rough rolling mill, and reference numeral 2 denotes a finishing rolling mill. The sheet bar roughly rolled by the rough rolling mill 1 is guided to a table roller (not shown) and sent to the finishing rolling mill 2 side. It has become.
Symbol P indicates a pass line.

On the entry side of the finishing mill 2, a sheet bar heating device 4 for heating the sheet bar is arranged. The heating device 4 includes a bar heater 5 as a bar heating device and an edge heater 6 as a bar end heating device arranged in the transport direction.

The bar heater 5 is, as shown in FIG.
This is a configuration in which the sheet bar 7 passes through the opening formed in the tunnel shape. As shown in FIG. 3 which is a schematic configuration diagram and FIG. 4 which is a schematic front view, the induction heating coil 8 The shaft is arranged in the conveying direction of the sheet bar 7 so as to make a round around in the width direction, and the sheet bar 7 can pass through the space inside the induction heating coil 8. The induction heating coil 8 is constituted by a plurality of sets of coils divided into a plurality of pieces in the axial direction, and each coil is supplied with current from a high frequency power supply 9. The high-frequency power supply 9 determines the amount of current to be supplied based on a command from the heating controller 12.

Here, FIG. 3 shows only one set of coils. In FIG. 3, reference numeral 10 denotes a roll of an apron roller. 4, the arrow A indicates the direction in which the coil current flows, and the arrow B indicates the direction in which the induced current induced in the seat bar 7 flows. Although not shown, a heat insulating material for protecting the induction heating coil 8 from radiant heat or the like is disposed inside the induction heating coil 8.

The edge heaters 6 arranged downstream of the bar heater 5 are arranged at both ends in the width direction of the sheet bar 7 and are each constituted by a pair of upper and lower induction heating coils. This is a device that performs induction heating of the direction end from above and below.

A temperature sensor 11 which constitutes a joint detecting means is arranged on the entrance side of the bar heater 5.
The temperature sensor 11 measures the temperature of the passing sheet bar 7 and supplies the measurement signal to the heating controller 12.

The preceding material 7 joined by the bar joining device
FIG. 6 shows the temperature of the joint C between the a and the following material 7b, and the joint C is in a high temperature state by heating for welding. In the vicinity of the joint C, the temperature drop is large at the leading end and the tail end of the sheet bar 7. Therefore, the junction can be detected by measuring the temperature. In addition,
The high-temperature portion of the joining portion C is cooled by, for example, a cooling truck (not shown) disposed downstream of the edge heater 6, so that the temperature is made uniform before finish rolling.

The heating controller 12 determines the temperature of the sheet bar 7 based on the signal from the temperature sensor 11 and, if the determined temperature is lower than a predetermined target temperature range, ends of the sheet bar 7 or the like. As a result, a current signal for compensating for the temperature drop is supplied to the high-frequency power supply 9 in accordance with the deviation between the target temperature and the detected temperature.

Between the exit side of the rough rolling mill 1 and the entrance side of the heating device 4, in order from the rough rolling mill 1 side, a winding and rewinding device 13, a warp straightening device 14, and a bar joining device 15. Is arranged.

The winding and rewinding device 13 is composed of a plurality of coilers 13a, which winds the subsequent sheet bar 7 rolled by the rough rolling mill 1 and adjusts the feed timing of the subsequent sheet bar 7. By adjusting the timing by winding in a coil shape, the temperature drop of the sheet bar 7 can be suppressed smaller than that of the looper.

The warp correction device 14 is composed of levelers in which correction rollers for warp correction are vertically arranged in a staggered manner, and the gap between the upper and lower correction rollers can be adjusted.

The bar joining device 15 is a device for joining the tail end of the preceding sheet bar 7 and the leading end of the succeeding sheet bar 7 by welding and joining the sheet bars 7 in an endless state. It can be conveyed to the finishing mill 2 side.

Reference numeral 16 denotes a finishing crop shear 16
A finishing scale breaker and an edger (not shown) are also provided between the finishing crop shear 16 and the entrance of the finishing mill 2.

Further, a joining crop shear 1 for arranging butting surfaces and the like for joining on the entry side of the bar joining device 15.
7 are arranged. Further, although not shown, various sensors for detecting the end position and the like of the sheet bar 7 in the plate width direction are arranged at appropriate positions, and the processing of each of the above-described devices is controlled by a signal from each sensor.

Next, the operation, effects, and the like of the hot rolling facility having the above configuration will be described. The subsequent sheet bar 7 that has been roughly rolled by the rough rolling mill 1 is sent to the winding and rewinding device 13, where it is once wound up in a coil shape and is in a standby state. And
At the timing when the tail end of the preceding sheet bar 7 passes through the bar joining device 15, the following sheet bar 7 is rewound,
The trailing sheet bar 7 is extended so that the leading end of the trailing sheet bar 7 passes through the bar joining device 15. The fed-out subsequent sheet bar 7 is corrected in the warp by the warp straightening device 14 and the surface of the leading end is adjusted by the cropping shear 17 for joining. Joined to the part. By repeating this, the sheet bar 7 is sent to the finish rolling side in an endless state, and the finish rolling is continuously performed by the finish rolling mill 2.

In the course of being conveyed to the finishing mill 2, the joined and endless sheet bar 7 passes through the position of the bar heater 5 and the position of the edge heater 6. At the position of the bar heater 5, the temperature in the longitudinal direction of the sheet bar 7 is continuously measured by the temperature sensor 11 before passing through the bar heater 5, and if the measured temperature is lower than the lower limit of the predetermined target temperature, the bar heater 5 Heated by 5,
Further, the sheet is sent to the finishing mill 2 after the edge position in the sheet width direction is heated by the edge heater 6.

In the endless rolling operation as described above, the finish rolling is continuously performed in a state where the preceding material and the following material are connected, so that the first and last sheet bars of the plurality of sheet bars to be joined. For those other than the above, since there is no unsteady portion at the tail end as in batch processing (when processing is performed without connecting each sheet bar 7), stable finish rolling can be performed over the entire length of the material to be rolled. realizable. That is, it is a facility that enables rolling although it is difficult to pass unsteady portions such as rolling of a thin material.

During the transportation from the rough rolling mill 1 to the finishing rolling mill 2, part of the heat held by the sheet bar 7 is dissipated into the atmosphere. In particular, there is a difference in the amount of heat dissipated into the air between the width direction end portion and the width direction center portion of the sheet bar 7, and the temperature of the sheet bar 7 is lower at the width direction end portion than at the width direction center portion. . If the temperature becomes low, the material becomes defective at the width-direction end. However, the width-direction end is heated by the edge heater 6 so that the temperature drop is compensated and the temperature in the width direction becomes uniform at a desired temperature. .

Also, by waiting in the coil state as described above, the seat bar 7 can be moved more than the stationary portion (the central portion in the longitudinal direction).
A large temperature drop occurs at the leading end and the tail end of the sheet bar 7, but by heating with the bar heater 5, the temperature drop at the longitudinal end of the sheet bar 7 is compensated and the temperature in the longitudinal direction is made uniform. Also, the thinner the material to be rolled, the larger the temperature drop. However, even if the slab heating temperature in a heating furnace (not shown) is not increased as compared with the time of batch rolling, the bar heater 5 can be used.
By warming the entire seat bar 7, the temperature compensation over the entire length in the longitudinal direction can be reliably realized.

The temperature drop at the end of the sheet bar 7 causes a decrease in finish workability due to abnormal growth of crystal grains, and also causes a flaw in the finish roll. Here, the heating device 4
When compensating for the temperature drop in the above, it is advantageous that the passing speed is slower. Therefore, in the present embodiment, the heating device 4 is arranged as close as possible to the finishing mill 2 so that the first Finishing mill 2
The passing speed is reduced to the threading speed at the time of entry, and the thread is passed through the heating device 4.

Here, the position of the bar heater 5 is determined so that the heating temperature is as high as possible and the heat dissipation after the heating is prevented as much as possible, and that the sheet bar 7 does not stick into the tunnel-shaped heating device 4. It is determined from the viewpoint of passing.

First, from the viewpoint of increasing the heating temperature, since the heating is performed by passing through the sheet bar 7 as described above, the most effective method for increasing the heating amount is the sheet bar 7. The goal is to make the speed as low as possible. In the case of continuous rolling, the first roll is conveyed at a high speed of about 80 to 150 mpm until the leading end comes to a position before the finish crop shear 16. Therefore, the position where the heating can be performed without lowering the rolling efficiency and while preventing the temperature reduction due to the heat radiation caused by lowering the speed as much as possible is a position before the crop shear 16, that is, a position close to the finish rolling mill 2.

Further, from the viewpoint of preventing heat dissipation from being heated by the bar heater to being engaged in the finishing mill, it is better to be as close as possible to the finishing mill 2, which is consistent with the above-mentioned viewpoint of the heating efficiency. .

Further, from the viewpoint of preventing the sheet bar 7 from hitting the heating device 4, the lower the conveying speed, the more the plate splashes on the table roller can be suppressed. The entry side of finish rolling at a reduced speed is desirable. Since there is no or little warping at the joint C between the joined seavers 7, the heating device 4
What is necessary is just to be downstream from the bar joining apparatus 15.

From the above, as shown in FIG. 1, it is optimal to arrange the bar heater 5 and the edge heater 6 on the entry side of the finishing mill 2 as much as possible while taking into consideration interference with other equipment. Arrangement.

The heating by the bar heater 5 is performed when the sheet bar 7 passes through a tunnel-shaped induction heating coil 8 as shown in FIG. At this time, if the tip of the sheet bar 7 is warped, the sheet bar 7
May hit the induction heating coil 8 and the heat insulating material,
In the present embodiment, the sheet bar 7 is configured so as to pass through the heating device 4 after the warp is corrected by the warp correction device 14. Therefore, the amount of warpage of the sheet bar 7 passing through the heating device 4 is reduced. As a result, the contact of the sheet bar 7 with the induction heating coil 8 or the like is suppressed. As a result, damage to the induction heating coil 8 and the heat insulating material, that is, damage to the equipment of the induction heating coil 8 is prevented, and stoppage of the equipment and the like are avoided. In addition, the induction heating coil 8 can be arranged closer to the surface of the sheet bar 7 by the amount by which the amount of warpage is suppressed, thereby improving the heating efficiency.

As described above, the bar heater 5 is installed on the exit side of the winding and rewinding device 13 and on the exit side of the bar joining device 15, and is installed on the entrance side of the finishing mill 2. Heating can be performed with high efficiency without lowering the conveyance speed, and the breakage of the heating device 4 due to the warpage of the sheet bar 7 can be completely prevented.

In the above embodiment, since the bar heater 5 heats the entire sheet bar 7, the bar heater 5 is designed to heat the end of the sheet bar 7 in the width direction of the sheet higher by the arrangement of the induction heating coil 8. Then, the edge heater 6
May be omitted. However, the heating control is easier if the edge heater 6 is provided.

Further, in the case of a rolling equipment for rolling a steel type in which the temperature drop at the end in the width direction is not a problem, the edge heater 6 may be omitted. Also, the example in which the edge heater 6 is arranged on the exit side of the bar heater 5 has been described.
The edge heater 6 may be arranged on the entry side of. However, when the edge heater 6 is used as a heating device for adjustment after the entire width direction is heated by the bar heater 5, it is better to arrange the edge heater 6 on the exit side of the bar heater 5.

Further, the bar heater 5 is not limited to the above-described configuration, and is configured by arranging induction heating coils whose axes are vertically directed independently above and below the seat bar 7. Is also good. In this case, since the distance between the upper and lower induction heating coils can be adjusted, the distance between the upper and lower induction heating coils may be adjusted according to the thickness or warpage of the sheet bar 7.

Further, the bar heating device 4 is not limited to a heating method using induction heating. For example, as shown in FIG. 5, a gas heating type heating device 20 may be used. However, since the heating efficiency is lower than the heating by induction heating,
The passage length in the conveying direction of the sheet bar 7, that is, the heating time is longer than that of the induction heating method. FIG.
In the equipment shown in (1), all the crops at the end of the sheet bar 7 are cut by the joining crop shear 17.
By omitting the crop shear 16 before finishing and also serving as the edge heater 6, the length of the heating device 4 is increased.

The temperature sensor 11 does not need to be close to the bar heater 5 entrance side.
5 may be arranged on the exit side or the like. The temperature sensor 11 may be used as the joint detecting means. For example, the joint sensor may be detected by detecting the joining time of the bar joining device 15.
The time required for the junction C, that is, the end position of the sheet bar 7 to pass through the bar heater 5 may be determined from the transport time up to this point.

[0057]

As described above, in the hot rolling equipment of the present invention, even when finish rolling is performed continuously, the following material is kept in a coil state by the winding and rewinding device. In this way, the heat dissipation of the following material is suppressed, and the temperature drop of the entire sheet bar is reduced, and even if the temperature of the entire sheet bar or a part of the sheet bar exceeds the allowable level, the width direction of the sheet bar by the bar heating device is reduced Since the temperature can be compensated by performing the entire heating, it is possible to prevent the rolling load in the finish rolling from being partially increased without heating more than necessary in a heating furnace, and 1.2 mm or less. This has the effect that thin materials and the like can be stably manufactured.

At this time, if the invention described in claim 2 is adopted, not only the temperature in the longitudinal direction but also the temperature in the sheet width direction can be made uniform at a predetermined temperature, and the finish rolling is more stable, and There is an effect that a thin steel strip can be stably manufactured.

Further, when the invention described in claim 3 is adopted, there is an effect that the temperature of the front end portion and the tail end portion of the sheet bar having a large temperature drop in the longitudinal direction can be surely compensated.

Further, when the invention described in claim 4 is adopted, there is an effect that the temperature in the longitudinal direction can be surely made uniform at a predetermined temperature. In addition, when the invention described in claim 5 is adopted, since the bar heating device is an induction heating device, the temperature control of the heating becomes easy, and the heating time to the predetermined temperature can be shortened. This can prevent the line from being unnecessarily long.

Further, when the invention described in claim 6 is adopted, the sheet bar can be heated with high efficiency without lowering the conveying speed of the sheet bar due to the heating by the bar heating device, that is, without lowering the rolling efficiency. Thus, there is an effect that the contact of the sheet bar with the bar heating device can be reduced, which is advantageous for the durability of the bar heating device.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing a row of hot rolling equipment according to an embodiment of the present invention.

FIG. 2 is a schematic perspective view showing a bar heater according to the embodiment of the present invention.

FIG. 3 is a conceptual diagram showing a bar heater according to the embodiment of the present invention.

FIG. 4 is a schematic front view showing a bar heater according to the embodiment of the present invention.

FIG. 5 is a schematic configuration diagram showing another example of the hot rolling equipment row according to the embodiment of the present invention.

FIG. 6 is a diagram showing a temperature distribution near a joint immediately after joining.

FIG. 7 is a view showing a temperature distribution of a sheet bar fed from a winding / unwinding device on a finishing rolling mill entry side.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rough rolling mill 2 Finishing rolling mill 5 Bar heater (bar heating device) 6 Edge heater (end heating device) 7 Sheet bar 8 Induction heating coil 11 Temperature sensor 12 Heating controller 13 Winding / unwinding device 14 Warp straightening device 15 Bar Joining device 20 Heating device

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FI B21C 51/00 C21D 1/42 U 9/52 101 C21D 1/42 B21B 37/00 BBM 9/52 101 132B (72) Inventor Hiroshi Narumi 1 Kawasaki-cho, Chuo-ku, Chiba City, Chiba Prefecture Inside the Chiba Works, Kawasaki Steel Corporation (72) Inventor Tadao Nishiyama 1 Kawasaki-cho, Chuo-ku, Chiba City, Chiba Prefecture, Chiba Works, Chiba Works

Claims (6)

[Claims] 1. A bar joining device for joining a tail end of a preceding sheet bar and a tip end of a succeeding sheet bar between a rough rolling mill and a finishing rolling mill to continuously perform finish rolling. A hot-rolling facility for performing, comprising, between the rough rolling mill and the bar joining device, a winding and rewinding device for temporarily winding and waiting the sheet bar and waiting, and the bar joining device and the bar A hot rolling facility comprising a bar heating device that can heat the entire width of a sheet bar between the finishing mill and the finishing mill. 2. The hot rolling as claimed in claim 1, further comprising an end heating device for heating an end portion in the width direction of the sheet bar, which is separate from the bar heating device. Facility. 3. A joint detecting means disposed between the bar joining device and the bar heating device for detecting a joint between sheet bars by the bar joining device, and based on detection by the joint detecting means. 3. The hot rolling equipment according to claim 1, further comprising a controller that controls heating of the sheet bar by the bar heating device. 4. A temperature sensor disposed on an entrance side of the bar heating device for detecting a temperature of a sheet bar, and the temperature sensor detected by the temperature sensor is controlled by the bar heating device so as to be a predetermined target value. The hot rolling equipment according to claim 1, further comprising a controller configured to control heating of the sheet bar. 5. The bar heating device according to claim 1, wherein the bar heating device is a device for heating by induction heating.
The hot rolling equipment according to any one of the above. 6. The bar heating device according to claim 1, wherein the bar heating device is arranged close to a finishing mill input side.
The hot rolling equipment according to any one of the above.