JPH1133601A - Rolling equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase the kinds of steels for which a slab with a satisfactory quality is used, whose product quality is improved and which can be produced by heating a continuously cast slab by roller hearth furnace and working beam furnace, keeping the heat of the slab, adjusting a transfer speed, rolling it by a finishing mill, and winding it. SOLUTION: By a first roller hearth furnace RH1 provided at the outlet of each continuous casting machine, the slab is transferred, is heated, and the heat of the slab is kept. The slab is supplied to the working beam furnace WBF through a roller table. Hereupon, the slab is heated further to a high temperature, for instance, 1200 to 1260 deg.C. By a second roller hearth furnace RH2, while keeping the temperature of the slab, the slab is sent out at a speed adjusted to the bringing-in speed of the finishing mill. By the finishing mills F1 to F6, the slab is rolled to a sheet metal according to a specification, for instance, 1.5 to 1.0 mm, is sent to a down-coiler D/C, and is wound on a coil. Satisfactory finish rolling can be performed, and the number of the stages of the rolling mill can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rolling plant which transports a thin slab supplied from a continuous casting machine while heating it, and supplies a slab at an appropriate temperature to a rolling mill.

[0002]

2. Description of the Related Art A thickness of 50 mm supplied from a continuous casting machine.
The slab was heated while being transported in a roller hearth furnace, and was directly rolled by a finishing mill. FIG. 12 shows a conventional slab rolling apparatus of about 50 mm. 2
The slab of about 50 mm supplied from the base continuous casting machine is heated in the roller hearth furnace RH, and is alternately moved laterally on a rolling line via a roller table, and further heated by the roller hearth furnace RH. Rolled into thin plates by rolling mills F1 to F7, and down-coiler D / C
It is wound up.

Further, a thickness 70 supplied from a continuous casting machine is required.
A slab of about 90 mm is heated while being conveyed in a roller hearth furnace RH as shown in FIG. 13 and further heated to a high temperature in a walking beam furnace WBF, or heated in a roller hearth furnace RH, and then inverted. After being rolled by the rough rolling mills R1 and R2, wound up by a winding and rewinding machine and kept warm, it is rolled into a thin plate by finishing mills F1 to F7 and wound up by a down coiler D / C.

As a heating furnace for continuously transporting a slab while heating it, a roller hearth furnace has been conventionally used as described above. As shown schematically in FIG. 14, the roller hearth furnace includes a driving roll 3 in a horizontal heating furnace 2.
The slab 1 is heated while being moved horizontally by the rotation of the driving roll 3. In this roller hearth furnace, the feed speed can be freely adjusted by adjusting the rotation speed of the driving roll 3, and the slab 1 is connected to a continuous casting machine or a rolling mill, and the slab 1 is moved at the speed of the continuous casting machine or the rolling mill. Heating or warming can be performed while continuously transporting according to the temperature. However, such a roller hearth furnace has a problem that the temperature inside the furnace is limited because the driving roll 3 is exposed to a high temperature. That is, the drive roll itself is water-cooled, but even in this case, the furnace temperature can be up to 115
If the temperature is limited to about 0 ° C., and if the temperature is increased more than that, the drive roll 3 is severely damaged, and the life is extremely shortened.

As a heating furnace for heating the slab while transporting it, a walking beam furnace schematically shown in FIG. 15 is used. This furnace includes a moving beam 4 extending substantially horizontally in a heating furnace 2 and a fixed support member 5 for supporting the slab 1. The moving beam 4 repeats ascending → advance → descent → retreat to move the slab 1 The moving beam 4 and the fixed supporting member 5 are alternately supported to advance intermittently. Note that a cam, a wedge, and the like are used to move the moving beam 4 up and down, and a driving cylinder and the like are used to move forward and backward. Such a walking beam furnace is disclosed in, for example, JP-A-4-2358.
No. 15 (driving method of a walking beam type transport device) and the like. The walking beam furnace is heating furnace 2
Since there is no mechanical part inside, the slab can be transported while being heated at a high temperature of 1150 ° C. or higher (for example, about 1300 ° C.). However, the movement of the slab in the walking beam furnace is intermittent in principle, so that the slab 1 is connected to a continuous casting device or a finishing mill as in the case of a roller hearth furnace, and the slab 1 is placed in a continuous casting device or a finishing mill. It was not possible to heat or keep the temperature while continuously transporting according to the speed. For this reason, conventionally, the walking beam furnace has been mainly heated or kept warm by supplying the slab to the rough rolling mill or intermittently moving the slab in the width direction.

[0006]

The rolling equipment shown in FIG. 12 cannot raise the temperature of the slab to 1150 ° C. or more due to the temperature limitation by the roller hearth furnace. Therefore, the thickness of the slab that can be rolled is limited to about 50 mm. Becomes However, the quality of a thin slab of about 50 mm is poor, and therefore the quality of a rolled product is also poor. In addition, since the temperature cannot be increased to 1150 ° C. or more, a large number of finishing rolls are required, and it is difficult to produce a thin plate having a thickness of 1.5 mm or less.

Further, in the rolling equipment shown in FIG. 13, when a roller hearth furnace is used before the rough rolling mill, the temperature cannot be set to a high enough temperature for the rolling of the rough rolling mill. And the reverse operation increased the rolling line length. When a walking beam furnace is used, the slab is heated to a high temperature and has a temperature suitable for rough rolling.However, since this furnace has no function of adjusting the slab transfer speed, the slab carrying speed to the rough rolling mill and The rolling speed of the rolling mill did not match, and a waiting time was sometimes generated in the rough rolling mill.

The present invention has been made to solve such a problem. That is, an object of the present invention is to provide a rolling facility capable of rolling a thin plate using a 70 to 90 mm slab from which a high-quality slab can be obtained.

[0009]

According to the first aspect of the present invention, there is provided a first roller hearth furnace for heating a slab supplied from a continuous casting machine while conveying the slab.
A walking beam furnace for heating the slab heated by the first roller hearth furnace to a higher temperature, a second roller hearth furnace for keeping the slab heated by the walking beam furnace and adjusting the conveying speed of the slab, A finish rolling mill for rolling a slab from the second roller hearth furnace and a down coiler for winding a rolled material rolled by the finish rolling mill are provided.

A high quality slab having a thickness of 70 to 90 mm is supplied from the continuous casting machine. The first roller hearth furnace heats the slab while conveying it in accordance with the slab supply speed of the continuous casting machine. The slab is further heated to a high temperature in a walking beam furnace so that it can be directly rolled by a finishing mill. The second roller hearth furnace maintains the temperature of the slab heated to this high temperature and supplies the slab conveying speed in accordance with the speed of the finishing mill. As a result, the slab is supplied to the finishing mill at a temperature at which even a slab having a thickness of 70 to 90 mm can be rolled and at a speed suitable for the rolling speed, so that a product having good quality and rolled to a thin plate can be manufactured. This equipment does not require a rough rolling machine or a winding / unwinding machine as compared with the conventional equipment shown in FIG. 13, and the rolling line length is shortened. Furthermore, since the temperature of the slab supplied to the finishing mill can also be set to an appropriate high temperature,
Good finish rolling can be performed, and the number of stages of the rolling mill can be reduced.

According to the second aspect of the present invention, a roller hearth furnace for heating a slab supplied from a continuous casting machine while conveying the slab is provided, and the slab heated by the roller hearth furnace is further heated to a high temperature and the conveying speed of the slab is reduced. It has a walking beam furnace to be adjusted, a finishing mill for rolling a slab heated by the walking beam furnace, and a down coiler for winding a rolled material rolled by the finishing mill.

A high quality slab having a thickness of 70 to 90 mm is supplied from the continuous casting machine. The roller hearth furnace heats the slab while conveying it in accordance with the slab supply speed of the continuous casting machine. The slab is further heated to a high temperature in a walking beam furnace capable of adjusting the conveying speed, so that the slab can be directly rolled by a finishing mill, and the slab conveying speed is supplied in accordance with the speed of the finishing mill. As a result, the slab is supplied to the finishing mill at a temperature at which even a slab having a thickness of 70 to 90 mm can be rolled and at a speed suitable for the rolling speed, so that a product having good quality and rolled to a thin plate can be manufactured.
This equipment does not require a rough rolling machine or a winding / unwinding machine as compared with the conventional equipment shown in FIG. 13, and the rolling line length is shortened. Further, the temperature of the slab supplied to the finish rolling mill can be set to an appropriate high temperature, so that good finish rolling can be performed and the number of stages of the rolling mill can be reduced.

According to the third aspect of the present invention, a roller hearth furnace for heating the slab supplied from the continuous casting machine while conveying the slab and adjusting the conveying speed, and further heating and sending out the slab heated in the roller hearth furnace An induction heating furnace, a finishing mill for rolling a slab heated by the induction heating furnace, and a down coiler for winding a rolled material rolled by the finishing mill.

A high quality slab having a thickness of 70 to 90 mm is supplied from the continuous casting machine. The roller hearth furnace heats the slab while transporting it in accordance with the slab supply speed of the continuous casting machine, and adjusts the slab to a carry-in speed of a downstream finishing mill to feed the slab. The induction heating furnace passes the slab sent from the roller hearth furnace as it is,
At that time, it is further heated to a high temperature and supplied so that it can be directly rolled by a finishing mill. As a result, the slab is supplied to the finishing mill at a temperature at which even a slab having a thickness of 70 to 90 mm can be rolled and at a speed suitable for the rolling speed, so that a product having good quality and rolled to a thin plate can be manufactured. This equipment does not require a rough rolling machine or a winding / unwinding machine as compared with the conventional equipment shown in FIG. 13, and the rolling line length is shortened. Further, the temperature of the slab supplied to the finish rolling mill can be set to an appropriate high temperature, so that good finish rolling can be performed and the number of stages of the rolling mill can be reduced.

According to a fourth aspect of the present invention, a first roller hearth furnace for heating a slab supplied from a continuous casting machine while conveying the slab in the rolling direction, and a slab heated in the first roller hearth furnace is perpendicular to the rolling direction. A walking beam furnace for transporting the slab heated to a higher temperature while heating the slab heated by the walking beam furnace, and adjusting the transport speed of the slab in the rolling direction and sending it out.
A roller hearth furnace, a finishing mill for rolling the slab from the second roller hearth furnace, and a down coiler for winding the rolled material rolled by the finishing mill are provided.

A high quality slab having a thickness of 70 to 90 mm is supplied from the continuous casting machine. The first roller hearth furnace heats the slab while conveying it in accordance with the slab supply speed of the continuous casting machine. The slab is further heated to a high temperature in a walking beam furnace so that it can be directly rolled by a finishing mill, and the slab is moved in the width direction and supplied to a second roller hearth furnace on a rolling line. The second roller hearth furnace maintains the temperature of the slab heated to this high temperature and supplies the slab conveying speed in accordance with the speed of the finishing mill. As a result, the slab is supplied to the finishing mill at a temperature at which even a slab having a thickness of 70 to 90 mm can be rolled and at a speed suitable for the rolling speed, so that a product having good quality and rolled to a thin plate can be manufactured. Compared with the conventional equipment shown in FIG. 13, this equipment does not require a rough rolling machine or a winding / unwinding machine, and the slab is moved in the width direction by a walking beam furnace. Is significantly shorter. Further, the temperature of the slab supplied to the finish rolling mill can be set to an appropriate high temperature, so that good finish rolling can be performed and the number of stages of the rolling mill can be reduced.

According to a fifth aspect of the present invention, a first roller hearth furnace for heating while conveying a slab supplied from a continuous casting machine, and a walking beam for further heating the slab heated by the first roller hearth furnace to a higher temperature. Furnace, a second roller hearth furnace for keeping the slab heated by the walking beam furnace and adjusting the slab conveyance speed, and a one-way roll roughing machine for rough rolling the slab from the second roller hearth furnace And a third roller hearth furnace for heating the slab sent from the rough rolling mill, a finish rolling mill for finish rolling the slab from the third roller hearth furnace, and rolling the rolled material rolled by the finish rolling mill. And a take down coiler.

A high quality slab having a thickness of 70 to 90 mm is supplied from the continuous casting machine. The first roller hearth furnace heats the slab while conveying it in accordance with the slab supply speed of the continuous casting machine, and the walking beam furnace raises the temperature of the slab further to a temperature suitable for rough rolling. The second roller hearth furnace maintains the high temperature and supplies the conveying speed to the rough rolling mill at a speed suitable for the rolling speed of the rough rolling mill. After one-pass rolling by a rough rolling mill, the slab is supplied to a finishing rolling mill by heating in a third roller hearth furnace.
Since this slab temperature is the highest temperature that can be output in a roller hearth furnace, it is lower than the temperature of the slab supplied to the finishing mill according to the invention of claims 1 to 4, but since the thickness of the slab is reduced by rough rolling, the finishing is finished. There is no problem in rolling.

According to the sixth aspect of the present invention, a first roller hearth furnace for heating while conveying a slab supplied from a continuous casting machine, and a walking beam for further heating the slab heated in the first roller hearth furnace to a higher temperature. Furnace, a second roller hearth furnace for keeping the slab heated by the walking beam furnace and adjusting the slab conveyance speed, and a one-way roll roughing machine for rough rolling the slab from the second roller hearth furnace And, a winding and rewinding machine that winds, insulates, and rewinds the slab sent out from the rough rolling mill, and a finishing mill that finish-rolls the slab from the winding and unwinding machine,
And a down coiler for winding the rolled material rolled by the finishing mill.

In the present invention, the third roller hearth furnace according to the fifth aspect of the present invention is replaced with a winding and rewinding machine, and the slab which has been roughly rolled is kept warm by the winding and rewinding machine and supplied to a finishing mill. The temperature of the slab supplied to the finishing mill is lower than the temperature of the slab supplied to the finishing mill in the invention of claims 1 to 4, but the thickness of the slab is reduced by rough rolling. There is no problem in finish rolling.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram of the rolling equipment according to the first embodiment of the present invention. In this rolling equipment, 70 to 90 m from two continuous casting machines No1CC and No2CC
m slabs are supplied alternately. When the slab thickness is reduced to about 50 mm, a slab having a problem in quality is manufactured, but when the slab has a thickness of 70 to 90 mm, a good quality slab is manufactured. This rolling mill follows two continuous casting machines, integrates the two systems into one system via a roller table, heats and transports the slab, the first group of roller hearth furnaces RH1, and the following walking beam furnace WBF And the subsequent second roller hearth furnace RH2, finishing mills F1 to F
6, and a down coiler D / C.

The first roller hearth furnace RH1 provided at the outlet of each continuous casting machine transports the slab at a speed corresponding to the slab unloading speed of the continuous casting machine and almost 1150 slabs.
° C, and heats it and keeps it at the first roller hearth furnace R
The slab is supplied to the walking beam furnace WBF by making the two systems into one system via a roller table by H1.
The walking beam furnace WBF heats the slab to a higher temperature. This temperature is 70-70 by the downstream finishing mill.
The temperature at which a 90 mm slab can be appropriately rolled to about 1.5 to 1 mm, for example, about 1200 to 1260 ° C., and at most about 1300 ° C.

The slab heated in the walking beam furnace WBF is sent out at a speed adjusted to the carrying-in speed of the finishing mill while maintaining its temperature by the second roller hearth furnace RH2. In the finish rolling mill, the slab is rolled to a thin plate, for example, 1.5 to 1.0 mm according to the specification, sent to a down coiler D / C, and wound around a coil. Although the finish rolling mill has six stages F1 to F6, the present invention is not limited to this. First and second used in this equipment
The roller hearth furnaces R1 and R2 may have the structure shown in FIG. 14, and the walking beam furnace WBF may have the structure shown in FIG. In this embodiment, a rough rolling mill and a winding / unwinding machine are not required as compared with the conventional equipment shown in FIG. 13, and the rolling line length is shortened. Furthermore, the temperature of the slab supplied to the finishing mill can be set to an appropriate temperature, so that good finish rolling can be performed and the number of stages of the rolling mill can be reduced.

Next, a second embodiment will be described with reference to FIG. The second embodiment is the same as the first embodiment except that the walking beam furnace WBF and the second roller hearth furnace RH2 of the first embodiment are replaced with a variable-speed walking beam furnace vWBF. Variable speed walking beam furnace vW
The BF is a device that can heat a slab to a high temperature of about 1300 ° C. similarly to the walking beam furnace WBF, and can transfer the slab continuously and at a variable transfer speed similarly to the roller hearth furnace RH. Thereby, substantially the same effects as in the first embodiment can be obtained.

The variable speed walking beam furnace vWBF will be described with reference to FIGS. 8, the variable speed walking beam furnace vWBF11 includes an upstream high-temperature continuous heating furnace 10a and a downstream high-temperature continuous heating furnace 10b, and the upstream and downstream heating furnaces 10a and 10b are arranged in the longitudinal direction of the slab 1. Are connected to each other. The upstream high-temperature continuous heating furnace 10a has a forward speed equal to the slab supply speed V1 from the roller hearth furnace aRH located on the left side in FIG. Further, the downstream high-temperature continuous heating furnace 10
b is the rolling speed V2 by the finishing mill 6 on the downstream side.
Has a forward speed equal to

As shown in FIG. 8, each of the high-temperature continuous heating furnaces 10a and 10b is a variable-speed walking beam furnace v
Two sets of moving beams 12, 1 extending horizontally in the WBF 11
3 are provided. The variable speed walking beam furnace vWBF11 is a conventional walking beam furnace WBF.
Similarly to the above, since there is no mechanical part inside the furnace, 1150
The slab is designed to be heated at a high temperature of not less than 0 ° C. (for example, up to about 1300 ° C.).

FIG. 9 is a partial perspective view of the high-temperature continuous heating furnaces 10a and 10b. As shown in FIGS. 8 and 9, moving beams 12 and 13 are each composed of a plurality of beams arranged at intervals in the width direction of slab 1. Each of the moving beams 12 and 13 has a wheel 14 at a lower end of a support member extending downward, and is horizontally moved back and forth by a hydraulic cylinder 16 (FIG. 8) along a lifting rail 15 located below by the wheel. It can be moved. In addition, lifting rail 1
5 moves up and down while being kept horizontal by the parallel link mechanism 17, and is moved up and down by another hydraulic cylinder 18 (FIG. 8). 8 and 9 show the movement beam 12
Wheel 14, lifting rail 15, and parallel link mechanism 1
7, a similar mechanism is provided separately for the moving beam 13 so that it can operate independently of each other. With this configuration, the moving beams 12 and 13 can independently repeat the ascending → forward → fall → retreat.

FIG. 10 is a diagram for explaining the operation of the high-temperature continuous heating furnace of the present invention. As shown in this figure, the moving beam 12,
13 repeats ascending → advance → descend → retreat,
In addition, while one moving beam (for example, 12) moves forward, the other moving beam (for example, 13) moves down, retreats, and rises. That is, the hydraulic cylinders 16 and 18 for the moving beams 12 and 13 are controlled by a control device (not shown), and one of the moving beams 12 and 13 always advances while supporting the slab 1 while the other descends. → Retreat → Ascend to prepare for the next advance. The forward speed of each of the moving beams 12 and 13 can be freely adjusted by controlling the flow rate of the hydraulic cylinder 16.

The above-described variable speed walking beam furnace v
The configuration of the WBF is the same as that of the conventional walking beam furnace WBF except that it has two sets of moving beams 12 and 13. Since there is no mechanical part in the heating area, the structure of the WBF is 1150.
The slab can be conveyed while being heated at a high temperature of at least 1 ° C (for example, up to about 1300 ° C). Also, since two moving beams 12 and 13 are provided, and one moving beam moves forward while the other moving beam descends → retreats → rises, the slab in the furnace is alternately supported by the two moving beams. It can be advanced continuously at almost the same height. Further, even in the case of a thin slab, the tip is always supported by two sets of moving beams, so that the tip does not hang down and can be transported stably in the length direction.

Since the forward speed of each of the moving beams 12 and 13 is variable, the roller hearth furnace aR
H and the finishing mills F1 to F6 on the delivery side are interlocked to continuously heat the slab, and the heating temperature can be set to 1150 ° C or higher (以上 1260 ° C).

Further, an upstream high-temperature continuous heating furnace 10a having a forward speed equal to the slab supply speed from the input roller hearth furnace aRH, and a downstream high-temperature continuous heating furnace 10a having a forward speed equal to the downstream finish rolling speed. A heating furnace 10b is provided, and the upstream and downstream heating furnaces 10a and 10b are connected to each other in the longitudinal direction of the slab so as to reduce the slab supply speed on the furnace entrance side and the rolling speed on the furnace exit side by two. The speed of each slab can be adjusted,
(90 mm).

Next, a third embodiment will be described with reference to FIG. In the third embodiment, the walking beam furnace WBF of the first embodiment and the roller hearth furnaces R1 and R2 before and after the walking beam furnace WBF are used.
It is the same as the first embodiment except that the roller hearth furnace aRH and the induction heating furnace IH are changed.

The roller hearth furnace aRH is the same as the furnace used in the first and second embodiments, can heat up to about 1150 ° C., and can adjust the slab transfer speed. In this embodiment, the speed is set to match the loading speed of the downstream finishing mill F1. In the induction heating furnace IH, the temperature of the slab to be transported is adjusted to a temperature suitable for finish rolling (for example, 12
(00 to 1260 ° C.) and supply it to the finishing mill F1. Thereby, substantially the same effects as in the first embodiment can be obtained.

FIG. 11 shows an example of a configuration diagram of an induction heating furnace. An inductor having a built-in coil is provided with the slab interposed therebetween, and an alternating current is supplied from an AC power supply to generate an electromotive force in the slab passing through an alternating magnetic field formed by the coil by electromagnetic induction. An eddy current flows in the slab due to the electromotive force, and heat is generated due to the resistance loss.

Next, a fourth embodiment will be described with reference to FIG. The fourth embodiment is a modification of the first embodiment,
The first roller hearth furnace RH1 immediately before the walking beam furnace WBF is arranged at the outlet of the continuous casting machine, the walking beam furnace WBF is of a type for moving the slab in its width direction, and the second roller hearth furnace RH2 is placed on the rolling line. The roller hearth furnace RH at the outlet of the continuous casting machine transports the slab in accordance with the slab transport speed of the continuous casting machine, and the walking beam furnace WBF performs the finish rolling. High temperature suitable for
(1260 ° C) while moving the slab in the width direction while heating it,
The roller hearth furnace RH on the entry side of the finishing mill transports the slab at a speed corresponding to the loading speed of the finishing mill while maintaining this temperature. However, the line length of the rolling equipment has been significantly reduced. FIG. 5 is an example in which the arrangement of FIG. 4 is changed, and is functionally and effectively substantially the same as the equipment of FIG.

Next, a fifth embodiment will be described with reference to FIG. In the fifth embodiment, between the second roller hearth furnace RH2 of the first embodiment shown in FIG. 1 and the finishing mill, the slab temperature after the rough rolling with the one-way roll (without the reversing roll) R is set. A third roller hearth furnace RH3 for maintaining the temperature at approximately 1150 ° C. and feeding the slab at the carrying speed of the finishing mill is provided. A high-temperature slab suitable for rolling is supplied to the rough rolling mill R. Although the slab temperature supplied to the finishing mill is lower than in the first to fourth embodiments, the slab thickness is small, so that it does not hinder the finish rolling.

Next, a sixth embodiment will be described with reference to FIG. The sixth embodiment is the same as the fifth embodiment except that the third roller hearth furnace RH3 of the fifth embodiment shown in FIG. 6 is replaced with a winding and rewinding machine. The rewinding machine serves to maintain the temperature of the roughly rolled slab. The finish rolling mill unwinds the slab from the winding and rewinding machine at a speed suitable for the finish rolling, so that there is no problem with the supply speed.

In the above embodiment, the case where the number of continuous casting machines is two has been described. However, the present invention can be applied to only one casting machine, and a plurality of continuous casting machines may be used.

[0039]

As described above, the rolling equipment of the present invention
The following effects are obtained. High quality slab can be produced by continuous casting machine 7
Since a slab having a thickness of 0 to 90 mm is used, the product quality is improved and the types of steel that can be produced are increased. By setting the rolling temperature to be higher than that of the rolling equipment shown in FIG.
It can be manufactured as thin as about 5 to 1.0 mm. By setting the temperature of the slab carried into the finishing mill to a high temperature, the number of stages of the finishing mill can be reduced as compared with the conventional one. Although the temperature of the slab is the same as the conventional one, the thickness of the slab supplied to the finishing mill is reduced by rough rolling, so that the number of stages of the finishing mill can be smaller than that of the conventional one. For example, the number of stages can be increased from seven to six. In the case where a heating and retaining device such as a rough rolling mill and a winding / unwinding machine is not required, rolling equipment with a short rolling line length can be realized at low cost.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a first embodiment of the present invention.

FIG. 2 is a configuration diagram of a second embodiment of the present invention.

FIG. 3 is a configuration diagram of a third embodiment of the present invention.

FIG. 4 is a configuration diagram of a fourth embodiment of the present invention.

FIG. 5 is a configuration diagram showing a modification of the fourth embodiment of the present invention.

FIG. 6 is a configuration diagram of a fifth embodiment of the present invention.

FIG. 7 is a configuration diagram of a sixth embodiment of the present invention.

FIG. 8 is a configuration diagram of a variable speed walking beam furnace used in a second embodiment.

FIG. 9 is a partial perspective view of FIG.

FIG. 10 is a diagram illustrating the operation of a variable speed walking beam furnace.

FIG. 11 is a diagram showing an example of a configuration of an induction heating furnace.

FIG. 12 is a diagram showing an example of a conventional rolling facility for rolling a 50 mm thick slab.

FIG. 13 is a diagram showing an example of a conventional rolling facility for rolling a 70-90 mm thick slab.

FIG. 14 is a schematic view of a conventional roller hearth furnace.

FIG. 15 is a schematic view of a conventional walking beam furnace.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Slab 2 Heating furnace 3 Drive roll 4 Moving beam 5 Fixed support material 6 Finishing rolling mill 10a, 10b High-temperature continuous heating furnace 12, 13 Moving beam 14 Wheel 15 Lifting rail 16 Hydraulic cylinder 17 Parallel link mechanism 18 Hydraulic cylinder No1CC, No2CC continuous casting machine RH, RH1, RH2 roller hearth furnace WBF walking beam furnace vWBF variable speed walking beam furnace F1 to F7 finishing mill D / C down coiler IH induction heating furnace R rough mill

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kazumi Mori 1 Shinnakaharacho, Isogo-ku, Yokohama-shi, Kanagawa Ishikawashima-Harima Heavy Industries, Ltd.

Claims (6)

[Claims] 1. A first roller hearth furnace for heating while conveying a slab supplied from a continuous casting machine, a walking beam furnace for further heating the slab heated by the first roller hearth furnace to a higher temperature, and the walking A second roller hearth furnace for keeping the temperature of the slab heated by the beam furnace and adjusting the conveying speed of the slab, a finish rolling mill for rolling the slab from the second roller hearth furnace, and a finish rolling mill. A rolling facility, comprising: a down coiler for winding a rolled material. 2. A roller hearth furnace for heating a slab supplied from a continuous casting machine while transporting the slab, and a walking beam furnace for heating the slab heated by the roller hearth furnace to a higher temperature and adjusting the transport speed of the slab. And a finishing mill for rolling a slab heated by the walking beam furnace, and a down coiler for winding a rolled material rolled by the finishing mill. 3. A roller hearth furnace for heating a slab supplied from a continuous casting machine while conveying the slab and adjusting a conveying speed, and an induction heating furnace for further heating and sending the slab heated by the roller hearth furnace. A finishing mill for rolling a slab heated by the induction heating furnace; and a down coiler for winding a rolled material rolled by the finishing mill. 4. A first roller hearth furnace for heating a slab supplied from a continuous casting machine while conveying the slab in a rolling direction;
A walking beam furnace which transports the slab heated by the first roller hearth furnace in a direction perpendicular to the rolling direction and further heats the slab heated, and heats the slab heated by the walking beam furnace and transports the slab in the rolling direction. A second roller hearth furnace that adjusts and sends the speed, a finishing mill that rolls the slab from the second roller hearth furnace, and a down coiler that winds the rolled material that has been rolled by the finishing mill. Rolling equipment. 5. A first roller hearth furnace for heating a slab supplied from a continuous casting machine while transporting the slab, a walking beam furnace for heating the slab heated by the first roller hearth furnace to a higher temperature, and the walking. A second roller hearth furnace for keeping the temperature of the slab heated by the beam furnace and adjusting the conveying speed of the slab, a one-way roll rough rolling machine for roughly rolling the slab from the second roller hearth furnace, and this rough rolling A third roller hearth furnace for heating the slab sent from the mill, a finish rolling mill for finish-rolling the slab from the third roller hearth furnace, and a down coiler for winding a rolled material rolled by the finish rolling machine, A rolling facility comprising: 6. A first roller hearth furnace for heating a slab supplied from a continuous casting machine while transporting the slab, a walking beam furnace for heating the slab heated by the first roller hearth furnace to a higher temperature, and the walking. A second roller hearth furnace for keeping the temperature of the slab heated by the beam furnace and adjusting the conveying speed of the slab, a one-way roll rough rolling machine for roughly rolling the slab from the second roller hearth furnace, and this rough rolling A winding and rewinding machine that winds and keeps and rewinds a slab sent out from the mill, a finish rolling mill that finish-rolls the slab from the winding and rewinding machine, and winds up the rolled material that has been rolled by the finish rolling mill. A rolling facility comprising: a down coiler.