JPH07314004A - Rolling equipment - Google Patents

Abstract

PURPOSE:To enable rolling to sheet metal, to prevent occurrence of camber and to shorten a rolling line when a coiler is used by arranging two roughing mills in tandem, coiling with the coiler or keeping heat in a heating furnace for transporting after forward rolling. CONSTITUTION:Two roughing mills R1, R2 are arranged in tandem in the vicinity of the outlet side of the heating furnace 1 and the coiler 3 with which coiling and uncoiling are executed is provided in the vicinity of the outlet side of the roughing mill R2. Oh the outlet side of the coiler 3, a finishing mill train F1-F5 which consists of five mills is installed and, on the outlet side of this train, a down coiler 4 for coiling the material 2 to be rolled in completion of finish rolling is provided. The material 2 to be rolled is defined as steel. Further, the roughing mill R1 is taken as a 2-high rolling mill, but it may be taken as a 4-stage rolling mill like the roughing mill R2 corresponding to rolling conditions.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to rolling equipment, and more particularly to rolling equipment in which the temperature drop of the material to be rolled at the rough rolling stage is reduced.

[0002]

2. Description of the Related Art A reverse rolling machine is provided in a rough rolling line to perform forward rotation and reverse rolling to construct a single rough rolling machine.
A compact rolling mill is used. FIG. 5 shows an example of rolling equipment for performing rough rolling with one reverse rolling mill. The material to be rolled 2 having a thickness of about 90 mm sent from the heating furnace 1 is forward-rotated and reverse-rolled by the reverse rolling machine RRM, thinned to about 25 mm, and wound up by the winding machine 3. The reason why the coil is wound around 25 mm is that if it is wound thinner than this, the temperature drop of the coil end face and the winding core becomes large, and the temperature distribution in the coil becomes uneven, which adversely affects the finish rolling. It is to exert. The finish rolling is performed by unwinding the material 2 to be rolled from the winder 3 and the finishing rolling mill rows F1 to F5.
To be wound up as a product.

[0003]

When rough rolling is carried out by using a reverse rolling mill to perform normal rotation and reverse rotation, a conveyance line of a considerable length is required before and after the reverse rolling mill. Referring to FIG. 5, an example of the lengths before and after the reverse rolling machine RRM will be described. The rolled material 2 having a thickness of 90 mm and a length of 30 m is described below.
When (indicated as 90 mm × 30 m) is sent out, when this is forward-rolled, it becomes 62 mm × 42 m, and a length of 42 m is required as L1. If this is reverse-rolled, 40
mm × 68 m and L2 of 68 m is required. After that, it is forward-rolled to about 22 mm and wound on the winder 3. In this case, a total of 110 before and after the reverse rolling machine RRM
m transport lines are required.

Further, when the material is rolled in the forward rotation or the reverse rotation, the temperature of the material 2 to be rolled is lowered. For example, when leaving the heating furnace 1, 12
If the temperature is set to 00 ° C., after three passes of normal rotation, reverse rotation, and normal rotation, the temperature drops to about 1000 ° C. in a state of being wound on the winder 3.
Therefore, finish rolling is performed from about 1000 ° C., but if the rolling temperature is low, it is necessary to increase the rolling load of each rolling mill. Further, it is necessary to increase the number of finish rolling mills in order to roll to a thin thickness.

When the normal rolling and the reverse rotation are repeated in the rough rolling,
The control becomes complicated, and a camber in which the material to be rolled 2 bends leftward or rightward in a bow shape with respect to the traveling direction easily occurs.

The present invention has been made in view of the above problems, and reduces the temperature drop of the material to be rolled in rough rolling to reduce the number of finishing rolling mills or to roll to a thin sheet thickness. The purpose is to do. Moreover, it aims at shortening the length of a rolling line using a winding machine.

[0007]

In order to achieve the above object, two rough rolling mills arranged in series for rolling a material to be rolled supplied from a heating furnace, and a rough rolling mill provided on the outlet side of the rough rolling mill. And a finishing rolling mill row provided on the outlet side of the winding machine.

[0008] Further, two rough rolling mills arranged in series for rolling the rolled material supplied from the heating furnace, and a conveyer provided on the outlet side of the rough rolling mill for heating and rolling the rolled material Heating furnace, and a finishing rolling mill train provided on the exit side of the carrying heating furnace.

[0009]

The rolling material fed from the heating furnace 1 is immediately rolled by two rough rolling mills arranged in series and wound into the winder, so that the temperature drop of the rolling material is reduced. As a result, the material to be rolled having a high temperature is supplied to the finish rolling line, and the number of finish rolling mills can be reduced or rolling to a thin plate can be performed. In addition, the length of the rough rolling line is greatly reduced by using the winder. Since the rolling in which the forward rotation and the reverse rotation are combined is not performed, the control of the rough rolling becomes easy, and the occurrence of the camber in which the material to be rolled bends in an arch can be prevented.

Even when a heating furnace for transporting the material to be rolled is used instead of the winder, the temperature can be prevented from lowering, and the number of finishing mills can be reduced or rolling to a thin plate is possible. Becomes By not performing the forward rotation and the reverse rotation, it becomes easy to control the rough rolling and it is possible to prevent the occurrence of camber.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a block diagram of the first embodiment. Two rough rolling mills R1 and R2 are installed in tandem near the exit side of the heating furnace 1, and a winding machine 3 capable of winding and rewinding is provided near the exit side of the rough rolling machine R2. On the output side of the winding machine 3, five finishing rolling mill rows F1 to F5 are provided, and on the output side, a down coiler 4 that winds up the material to be rolled 2 that has been subjected to finish rolling is provided. The rolled material 2 is a steel material. Although the rough rolling mill R1 is a two-high rolling mill, it may be a four-high rolling mill, like the rough rolling mill R2, depending on rolling conditions.

Next, the operation will be described. FIG. 3 shows the rolling schedule of the first embodiment. 90 sent from heating furnace 1
The material 2 to be rolled of mm is immediately rough-rolled, is rolled from 90 mm to 50 mm by the rough rolling machine R1, and is rolled by the rough rolling machine R2 to 50 mm.
It is rolled from 24 mm to 24 mm and immediately wound up by the winder 3. As described above, since a short distance is rolled and wound in a short time, the temperature drop is small.
If it is 200 ° C., it will be about 1150 ° C. in a wound state. Next, the finish rolling is started, and first, it is unwound from the winding machine 3, rolled by the finish rolling machine F1 from 24 mm to 9.3 mm, and finished by the finish rolling machine F2 from 9.3 mm to 4.4 mm.
It is rolled into 4 and it is 2.5mm from 4.4mm by finishing mill F3.
mm to 1.6 mm from 2.5 mm with finish rolling machine F4
Finally, the finishing rolling mill F5 is 1.2m from 1.6mm.
rolled to m. The material to be rolled 2 rolled to 1.2 mm is wound up on the down coiler 4 as a product. In addition, the temperature at this time secures 860 degreeC or more. This is Fe-
This is because the temperature is set higher than the A3 transformation point in the C equilibrium diagram to prevent deterioration of the material.

FIG. 4 shows a rolling schedule when the plate thickness of the product is 1.6 mm and four finishing rolling mills are used. The operation up to the winder 3 is the same as in the case of FIG. Finished rolling mill F1 rolled from 24mm to 8.5mm,
Finishing rolling mill F2 rolled from 8.5 mm to 3.9 mm, finishing rolling mill F3 rolled from 3.9 mm to 2.2 mm,
Finally, it is rolled by the finishing rolling mill F4 from 2.2 mm to 1.6 mm.

Next, a second embodiment will be described. FIG. 2 is a block diagram of the second embodiment. In the second embodiment, the first shown in FIG.
The winding machine 3 of the embodiment is a roller hearth furnace 5 and is the same as the first embodiment except for this. The roller hearth furnace 5 is a heating furnace for transportation in which a cover is provided on a roller table for transporting the material 2 to be rolled, and a burner is arranged in the cover to heat the material 2 to be rolled. Heat up. When the roller hearth furnace 5 is used, the rolling line is longer than when the winder 3 is used.

[0015]

As is apparent from the above description, according to the present invention, two rough rolling mills are arranged in tandem, and after forward rolling, they are wound on a winder or in a heating furnace for transportation. Since it retains heat, finish rolling can be performed at a high temperature, and even thin sheets can be rolled. In addition, the number of finish rolling mills can be reduced when not rolling to thin sheets. Further, when using the winding machine, the rolling line can be shortened.
Since reverse rolling is not used for rough rolling, control of rough rolling is simple and it is possible to prevent the occurrence of camber, which is likely to occur when performing forward rotation and reverse rolling.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a first embodiment.

FIG. 2 is a configuration diagram of a second embodiment.

FIG. 3 is a rolling schedule according to the first embodiment.

FIG. 4 is a rolling schedule when the number of finishing rolling mills is reduced by one in the first embodiment.

FIG. 5 is a configuration diagram of a conventional rolling line using a reverse rolling machine for rough rolling.

[Explanation of symbols]

 1 heating furnace 2 rolled material 3 winder 4 down coiler 5 roller hearth furnace (conveyance heating furnace) R1, R2 rough rolling machine F1, F2, F3, F4, F5 finish rolling machine

Claims (2)

[Claims] 1. Rough rolling mills arranged in series for rolling a material to be rolled supplied from a heating furnace, a winding machine provided on an outlet side of the rough rolling machine, and the winding machine. And a row of finishing rolling mills provided on the exit side of the rolling mill. 2. Two rough rolling mills arranged in series for rolling a material to be rolled supplied from a heating furnace, and a conveyer provided on the exit side of the rough rolling mill for heating and rolling the material to be rolled. Rolling furnace equipped with a heating furnace for heating and a row of finishing rolling mills provided on the exit side of the heating furnace for transportation.