JP3401738B2 - Metal plate rolling method and metal plate rolling device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention appropriately rolls a metal plate from multiple directions by performing a 90-degree turn around a rotation axis in the normal direction of the surface of the metal plate in the vicinity of a rolling mill to hot-roll it. The present invention relates to a method for rolling a metal plate and a rolling apparatus for a metal plate, which perform forming and rolling of a thick metal plate, or forming and tentering rolling, in particular,
The present invention relates to a method for rolling a metal sheet and a rolling apparatus for a metal sheet, which can shorten the rolling time or can suppress a reduction in rolling temperature before or during rolling.

[0002]

2. Description of the Related Art Generally, in thick plate rolling, a steel sheet is rolled according to the procedures listed below.

A1. Forming rolling: Forming rolling is performed for each steel sheet. A 2. 90-degree turn: 90-degree turn is performed by rotation around the rotation axis in the direction normal to the surface of the steel sheet. A3. Width-setting rolling: Rolling to a predetermined plate width. A 4. Rotate 90 degrees: Rotate 90 degrees again. A5. Thickening rolling: Thickening rolling is performed to a predetermined plate thickness.

Incidentally, the rolling of the metal plate in which the metal plate is rolled in multiple directions by appropriately turning 90 degrees in this way is hereinafter referred to as multi-direction rolling for convenience of explanation.

FIG. 1 is a block diagram of a conventional steel plate rolling apparatus for performing the above-described multidirectional rolling.

This rolling apparatus is composed of a heating furnace 13, a turnover setup apparatus 12B, and a rolling mill 11. A large number of transport rolls 20 are arranged on the transport path 3. The steel sheet 1 to be hot-rolled by the rolling mill 11 is preheated to a predetermined rolling temperature in the heating furnace 13. The steel sheet 1 carried in from the left side is heated in the heating furnace 13 and then rolled by the rolling mill 11 and discharged to the right side.
As shown by the arrow A, the sheet is conveyed from left to right. The transportation is performed by a transportation roll 20 arranged below the transportation path 3 and rotating while being in contact with the steel plate 1 to be transported. The transport roll 20 is rotationally driven by an electric motor of a power source (not shown).

Further, in the turnover setup device 12B, as shown in FIG.
2 is the range indicated by the alternate long and short dash line, and as shown in FIG. 2, the transport rolls 20 are arranged in two rows in the traveling direction of the arrow A of the steel plate 1 indicated by the alternate long and short dash line. Regarding the transport roll 20, in FIG. 20, a portion in contact with the steel plate 1 is shown by a solid line, and other portions are shown by broken lines. Further, in the two rows of the transport rolls 20, the left side row and the right side row are rotated in opposite directions in the traveling direction of the steel sheet 1, so that the steel sheet 1 can be rotated. In the multi-direction rolling, the above rotation is appropriately performed by 90 degrees (90 degree rotation).

For example, as shown in FIG. 2, the left-hand conveying roll 20 in the traveling direction of the steel plate 1 is designated by the reference numeral 20A, and the right-hand conveying roll 20 is designated by the reference numeral 20B. Further, when the transport roll 20A is rotationally driven so that the steel plate 1 advances in the normal traveling direction and the transport roll 20B is rotationally driven in the opposite direction, the steel plate 1 is moved in the directions indicated by arrows B and C in FIG. , Steel plate 1
Rotation is performed around the axis of rotation in the direction normal to the surface of.

[0009]

As described above, in multidirectional rolling, it is necessary to appropriately turn 90 degrees. For example, when shifting from forming rolling to tenter rolling, or tenter rolling to thickening rolling. At this time, for example, it was necessary to turn the steel sheet 90 degrees by the turning setup device 12B shown in FIGS. 1 and 2 described above. It usually takes a long time to turn a metal plate such as a steel plate by 90 degrees. For example, in the rolling apparatus of FIG. 1 described above, it takes about 15 seconds to turn 90 degrees by the turning setup apparatus 12B, compared with the rolling time of about 150 seconds in the multidirectional rolling using the rolling mill 11, and 2 If this 90-degree rotation is performed, it takes about 30 seconds for convenience, and the ratio of the rotation time to the rolling time is large, which is an obstacle to shortening the rolling time.

On the other hand, in the hot rolling of a metal sheet, it is necessary to obtain a specified rolling temperature up to the entrance side of the rolling mill. However, in the process up to the rolling mill entrance side, the metal plate may be in a standby state and cooled due to some factor.
In such a case, the rolling temperature is lowered, which may cause problems during rolling, such as product defects such as reduced rolling accuracy.

The present invention has been made to solve the above-mentioned conventional problems, and a first object thereof is to provide a method for rolling a metal sheet and a rolling apparatus for a metal sheet which can shorten the rolling time. . A second object of the present invention is to provide a method for rolling a metal plate and a rolling apparatus for a metal plate which can suppress a decrease in rolling temperature before rolling.

[0012]

First, in a method for rolling a metal sheet according to the first invention of the present application, a 90-degree turn is appropriately made by rotation about a rotation axis in a direction normal to the surface of the metal sheet in the vicinity of a rolling mill. In the method for rolling a metal sheet, which comprises rolling the metal sheet in multiple directions, the two metal sheets are simultaneously rolled in the vicinity of the rolling mill.
The first object is achieved by allowing 0-degree rotation and overlapping at least part of the time required for the 90-degree rotation of each of the two metal plates.

In the method for rolling a metal sheet according to the first aspect of the present invention , the second aspect is achieved in addition to the first objective by keeping the temperature of the metal sheet at the entrance side of the rolling mill. .

Further, in the metal plate rolling apparatus according to the second invention of the present application, the metal plate is appropriately rotated in the vicinity of the rolling mill by 90-degree rotation by rotation about the rotation axis in the direction normal to the surface of the metal plate. In a rolling apparatus for rolling metal plates from multiple directions, a heating furnace for raising the rolling temperature of the metal sheets, a heat-retaining facility for suppressing a decrease in rolling temperature, and a turn-over setup apparatus for turning two metal sheets at the same time by 90 degrees. By arranging and on the inlet side of the rolling mill in this order in the direction in which the metal plate is conveyed during rolling, the first and second objects are achieved.

The operation of the first invention will be briefly described below.

The present invention analyzes each time of the steps constituting the above-mentioned multidirectional rolling. As described above, the ratio of the time required for 90 ° turning to the rolling time is large. Therefore, in the present invention, two metal plates can be turned 90 degrees at the same time near the rolling mill. This makes it possible to mutually overlap at least a part of the time required to turn each of the two metal plates by 90 degrees. If the times are overlapped in this way, the rolling time can be shortened by the overlapping amount. That is, the rolling time can be shortened in this way as compared with the case where the conventional multi-direction rolling is performed on two metal plates individually, one after the other.

As described above, in rolling a steel plate which is a normal hot plate, steps A1 to A5 are sequentially performed. In this multi-direction rolling, if a turning setup device capable of turning two metal plates at the same time by 90 degrees is arranged on the inlet side and the output side of the rolling mill, the 90 degree turning in steps A2 and A4 should be performed simultaneously by the two metal sheets. After that, the rolling of steps A3 and A5 can be sequentially performed on the two metal plates. As described above, there are many multi-direction rollings in which the 90-degree rotation can be performed plural times at the same time, and the effect of shortening the rolling time is remarkable.

[0018]

[0019] In the present first invention when incubated a metal plate at the entry side of the rolling mill, it is possible to suppress the rolling temperature drop prior to the rolling. Here, the first invention is not limited to this, but such heat retention of the metal plate has a remarkable effect when combined with the first invention. In the above-mentioned first invention, two metal plates are rotated 90 degrees at the same time, and then these two metal plates are sequentially rolled by one rolling mill. Therefore, while rolling one metal plate, the other metal plate is in a standby state. Therefore, in the first invention ,
By applying such heat insulation of the metal plate, it is possible to suppress the reduction of the rolling temperature of the metal plate in the standby state. Therefore, by suppressing the decrease in rolling temperature before or during rolling, it becomes easier to roll the metal plate at the prescribed rolling temperature,
For example, the rolling quality can be improved.

Finally, the operation of the second invention will be briefly described.

In the third invention, the first invention described above is used.
The heat retention of the metal plate as described above is applied to, and the excellent effects of the heat retention of the first invention and the metal plate can be obtained. Further, in the second aspect of the present invention, the arrangement order of the constituent elements is devised, and the heat retaining equipment for suppressing the reduction of the rolling temperature can be effectively utilized.

In the present invention, the heating furnace for raising the rolling temperature of the metal sheet, the heat retaining equipment for suppressing the lowering of the rolling temperature, and the turning setup apparatus for simultaneously turning two metal sheets by 90 degrees are used for rolling. In this case, they are arranged on the entrance side of the rolling mill in this order in the traveling direction of the metal plate. With such an arrangement order, the above-mentioned heat retaining facility can suppress the cooling of the heated front metal plate first while the rear metal plate is being heated in the heating furnace. In addition, this heat-retaining facility can suppress the cooling of the other metal plate waiting to be rolled while one metal plate is being rolled. As described above, in the present invention, the heat insulation facility is frequently used, and the reduction of the rolling temperature can be effectively suppressed.

[0023]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 3 is a block diagram of the steel plate rolling apparatus of the first embodiment to which the present invention is applied.

In FIG. 3, the turnover setup device 12A is within the range of the one-dot chain line. In the conventional example of FIG. 1 described above, the turning setup device 12B can turn only one steel plate 1 by 90 degrees, whereas the turning setup device 12A of the present embodiment has an arrow A.
The length of the sheet in the conveying direction is extended, so that, for example, two steel sheets such as the steel sheets 1A and 1B shown in the figure are simultaneously loaded,
Two steel plates can be turned 90 degrees at the same time. The principle of the turning operation of the turning setup device 12A is as described above with reference to FIG. As described above, the present invention is applied to the present embodiment, and at least a part of the time required for turning each of the two steel plates (metal plates) by 90 degrees can be mutually overlapped.

The multi-direction rolling process in this embodiment will be described below in the order of steps.

B1. Form rolling: 2 steel plates 1A and 1B
Are rolled in series and simultaneously by the rolling mill 11. B 2.90 degree turn: Steel sheet 1 was turned by turn setup device 12A.
Turn two A and 1B 90 degrees at the same time. B3. Width-setting rolling: Steel plates 1A and 1B are tentering-rolled by a rolling mill 11 in series at the same time. B 4.90 degree rotation: Again, two steel sheets 1A and 1B are simultaneously rotated 90 degrees by the rotation setup device 12A. B5. Thickening rolling: First, only the steel plate 1A is thickened and rolled in the rolling mill 11 by repeating forward and backward movements in the direction of arrow A. This forward and backward movement is shown in FIG.
Then it is the right or left row. Steel plate 1B is used for the repeated forward and backward movements performed by steel plate 1A during the thickness increasing rolling.
In order not to interfere with each other, the steel plate 1B is retracted to the heating furnace 13 side to a position separated from the rolling mill 11 by a necessary minimum. B6. Thickening rolling: After thickening rolling of the steel plate 1A,
Then, the thickening rolling of the steel plate 1B is performed similarly to the steel plate 1A.

[0028] When performing the step B. 1 to B 6 as described above, multidirectional rolling two steel plates 1A and 1B is completed.

Here, in steps B 2 and B 4, the two steel plates 1A and 1B are simultaneously rotated 90 degrees. Therefore, the time required for 90 rotations of each of the two steel plates 1A and 1B is almost overlapped, and the rolling time can be shortened by this overlap.

The steel plates 1A and 1B may have different rolling conditions for tenter rolling. In this case, the 90 ° turn of B 4 may be carried out separately for the steel plates 1A and 1B.
That is, the 90-degree turn is performed at the step B 2 only on the steel plates 1A and 1B at the same time, and the steel plate 1B is evacuated.
Perform steps B. 3 to B 6 steel plates 1A only independently, it is also possible to perform the same steps B. 3 to B 6 after the relative steel 1B. Even in such a case, since the two steel plates 1A and 1B are simultaneously rotated 90 degrees in step B2 , it is possible to reduce the rolling time by at least this amount.

FIG. 4 is a block diagram of a second embodiment of a steel plate rolling apparatus to which the present invention is applied.

In this embodiment, the first to third inventions are applied. As is clear from the comparison with the first embodiment of FIG. 3 described above, the present embodiment includes the heat insulation facility 14. The heat retaining facility 14 is intended to retain heat for preventing the heat of the steel plate 1C indicated by the broken line from being diffused into the atmosphere.

The method of heat retention in the heat retention facility 14 is not specifically limited. For example, the following can be configured.

C1. The inner surface of the heat-retaining facility 14 that covers the entire steel plate inside to keep the heat is a mirror surface to prevent the temperature of the steel plate from decreasing due to the reflection of radiant heat from the steel plate. For example, in FIG.
The inner surface 14a of the heat insulation facility 14 is a mirror surface. FIG. 5
6 and 7 to be described later are perspective views of the steel plate 1 from the loading side. C2. A heat insulating material is attached to the inner surface of the heat insulation facility 14 that covers the entire steel plate. Alternatively, a heat insulating material may be used for the housing itself of the heat insulation facility 14. By using such a material having a heat insulating effect, it is possible to prevent heat from flowing out of the steel sheet into the atmosphere and prevent the temperature of the steel sheet from decreasing. For example, in FIG. 6, a heat insulating material is used for the housing 14b of the heat insulation facility 14. C3. A heating device is arranged inside the heat insulation facility 14 that covers the entire steel plate. This heating device is a burner or a fan that blows hot air, and raises the ambient temperature in the heat insulation facility 14 to prevent the temperature of the steel sheet from decreasing. Alternatively, the steel sheet may be heated so as to supplement the heat of the steel sheet lost by heat radiation. For example, in FIG. 7, 14 heating devices 14c are burners or hot air fans. C4. As described above, a heating device using electromagnetic induction is used as the heating device 34, and heating by this prevents the temperature of the steel sheet from decreasing. For example, in FIG. 8, the heat insulation facility 14 has an electromagnetic induction heating device 14d, which prevents the temperature of the steel sheet 1 from decreasing. FIG. 8 is a front view of the steel plate 1 as viewed from the loading side.

In the present embodiment, by using such a heat retaining facility 14, it is possible to suppress a decrease in the rolling temperature of the steel sheet before or during the multidirectional rolling using the rolling mill 11. Specifically, the above-mentioned step B1 of multidirectional rolling
In steps B6 to B6, before the step B1, while the rear steel plate 1B is being heated in the heating furnace 13, the heated steel plate 1A can be kept warm by the heat keeping facility 14. The steel plate 1B retracted at B5 can be kept warm. Depending on the case, even when two steel plates 1A and 1B are rolled in series at the same time, it may be possible to keep warm while the rolling mill 11 is not rolling, for example, it may be possible to keep warm in steps B1 and B3.

As described above, in this embodiment, first, the above-mentioned first
Similar to the embodiment, the turning setup device 12B can turn two steel plates at the same time by 90 degrees, and at least a part of the time required for turning each of the two steel sheets can be overlapped with each other. It can be shortened.
Further, in the present embodiment, the heat insulation facility 14 can suppress the reduction of the rolling temperature of the steel sheet before rolling or during multi-direction rolling, and can strictly follow the prescribed rolling temperature to improve the rolling precision and the control stability. Can be planned. Especially 2
When performing multi-directional rolling on one steel sheet at the same time, the steel sheet in the standby state can be kept warm and the reduction of the rolling temperature can be effectively prevented.

FIG. 9 shows an embodiment of the heat insulation equipment 14.

As shown in FIG. 5, the heat insulating equipment 14 has a heat insulating heat insulating material 32 and a heating device 34. Thermal insulation 3
2 is attached to the inner surface of the heat insulation equipment 14, and is attached not only to the upper surface and the lower surface in the heat insulation equipment 14 shown in FIG. 5 but also to the side surface (not shown). Also the transport roll 2
The heating device 34 is arranged on the upper surface of the steel plate 1C located on the upper surface of the steel plate 1C, and the steel plate 1C is heated by supplementing the lost heat.
Keep it warm. The heating device 34 heats the steel sheet 1C by generating an eddy current in the steel sheet 1C by electromagnetic induction to generate Joule heat.

[0039]

The rolling time can be shortened. Alternatively, it is possible to suppress a reduction in rolling temperature before or during rolling.

[Brief description of drawings]

FIG. 1 is a block diagram of a conventional steel plate rolling apparatus.

FIG. 2 is a perspective view of a turnover setup device that is used in the above-described rolling apparatus for a metal plate and performs a 90-degree turn.

FIG. 3 is a configuration diagram of a steel plate rolling apparatus of a first embodiment to which the present invention is applied.

FIG. 4 is a configuration diagram of a steel plate rolling apparatus of a second embodiment to which the present invention is applied.

FIG. 5 is a first heat insulation facility used in the second embodiment.
Example configuration diagram

FIG. 6 is a second heat insulation facility used in the second embodiment.
Example configuration diagram

FIG. 7 is a third heat insulation equipment used in the second embodiment.
Example configuration diagram

FIG. 8 is a fourth heat insulation facility used in the second embodiment.
Example configuration diagram

FIG. 9 is a configuration diagram of an example of heat insulation equipment used in the second embodiment.

[Explanation of symbols]

1, 1A to 1C ... Steel plate 3 ... Transport route 11 ... Rolling machine 12A, 12B ... Turning setup device 13 ... Heating furnace 14 ... Heat insulation equipment 20, 20A, 20B ... Conveyor rolls 32 ... Insulation insulation 34 ... Heating device

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-60-68102 (JP, A) JP-A-61-71121 (JP, A) JP-A-7-88528 (JP, A) JP-A-8- 206704 (JP, A) (58) Fields surveyed (Int.Cl. ⁷ , DB name) B21B 39/20 B21B 1/00-11/00 B21B 45/00

Claims (3)

(57) [Claims] 1. A method for rolling a metal sheet in which rolling is performed in multiple directions by appropriately performing 90-degree rotation by rotation around a rotation axis in the normal direction of the surface of the metal sheet in the vicinity of the rolling mill, A metal, which allows two metal plates to be rotated 90 degrees at the same time in the vicinity of a rolling mill, and at least a part of the time required for each of the two metal plates to rotate 90 degrees overlaps each other. How to roll a plate. 2. The method of rolling a metal plate according to claim 1, wherein the temperature of the metal plate is kept at the entrance side of the rolling mill. 3. A metal sheet rolling apparatus for rolling a metal sheet from multiple directions by appropriately performing 90 degree rotation by rotation around a rotation axis in the normal direction of the surface of the metal sheet in the vicinity of the rolling mill, A heating furnace that raises the rolling temperature of the metal sheet, a heat insulating device that suppresses the reduction of the rolling temperature, and a turn-over setup device that turns two metal sheets at the same time by 90 degrees are used to convey the metal sheet during rolling. A rolling apparatus for metal plates, characterized in that they are arranged on the entrance side of the rolling mill in this order in the direction.