JP3337097B2 - Rolling equipment and rolling method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rolling equipment for rolling a thin slab of about 100 mm supplied from a heating furnace and a method for rolling the same, and more particularly to a rolling equipment for performing finishing rolling by two reverse rolling mills and a rolling equipment for the same. It relates to a rolling method.

[0002]

2. Description of the Related Art In a hot rolling process, a slab is formed in a thickness of 20 to 30 mm.
And a finish rolling step of rolling to a thickness of about 1 to 2 mm. Conventionally, various types of rough rolling mills constituting the hot rolling equipment have been used. FIG. 7 shows an example of such an arrangement of rough rolling mills. FIG. 7A shows six rough rolling mills (R1 to R).
Roll the material to be rolled by 6) and use the scale breaker FS
After dropping the scale in B, seven finishing mills (F1 to F1)
This is a rolling facility that rolls at F7) and winds it around a down coiler DC. (B) shows the case where the rough rolling mill is a reverse rolling mill RRM1.
The hot rolling equipment is compact because it is used as a table, repeats normal rotation and reverse rotation, and sends it to finishing mills F1 to F6 after having a predetermined thickness. (C) is a modified version of (B), in which a strip (rolled material) sent from a reverse rolling mill RRM is wound on a winding and rewinding machine W, and this is finished from the tail end of the strip. This is sent to F1 to F5.

[0003] In the equipment provided with the winding and rewinding machine W, the temperature drop of the strip can be greatly improved by winding the coil, and it is not necessary to increase the rolling speed to prevent the temperature drop. The rolling speed can be reduced, and the rolling power can be reduced. Further, since the temperature drop of the strip is small, the temperature of the material to be rolled supplied to the rough rolling mill can be set low, and the rolling speed can be reduced. Since the number of units can be reduced, equipment costs can be significantly reduced.

Recently, the development of a continuous thin slab casting machine has led to
A thin slab of about 0 to 50 mm came to be cast,
A method has been developed in which the thin slab is directly charged into a heating furnace, soaked at a predetermined temperature, and then subjected to finish rolling by a direct finishing mill except for a rough rolling mill. However, since a material to be rolled having a thickness almost twice the conventional thickness is loaded into the finish rolling line, the load on the finish rolling mill is large and the efficiency is poor.

[0005] FIG. 8 shows a finishing mill FR from a continuous casting machine (not shown) via a heating furnace to solve such a problem.
1, F2 to F5 in a device to be directly charged, the first stand FR1 of the finish rolling mill as a reverse rolling mill RRM, thereby reducing the thickness to 20 to 30 mm,
The rolling mill FR1 of the first stand is also a finishing rolling mill, and the other finishing rolling mills F2 to F5 are tandemed for finish rolling.
In this case, the rewinding machine W that winds up the material 1 rolled by the reverse rolling mill FR1 is a reverse rolling mill F
It is provided on the upstream side of R1.

[0006]

In the case of the above-mentioned rolling line, the number of rough rolling mills is small, but the number of finishing rolling mills is large and the rolling line is long. For this reason, the equipment cost has been expensive. In addition, there is a steckel mill as a short-length rolling equipment.
No. 4,430,875, JP-A-59-191502 and JP-A-59-191503 disclose the technical contents. The Steckel mill includes a rolling mill, furnaces provided on the upstream side and the downstream side, and a winder provided in the furnace. The rolling mill is rotated forward and backward, and rolling is performed while winding and unwinding by the downstream and upstream winding machines. In the case of the winding machine of the Steckel mill, since the tip of the coil is hooked and fixed on the winding shaft, there is a problem that the tip of the coil is easily damaged and high-speed winding and rewinding cannot be performed. Further, there is a problem that scale is generated due to heating in the furnace, and quality is deteriorated.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has been made to enable rough rolling to be thinned using a heat retaining coiler, and to perform rough rolling and finish rolling by the same reverse rolling mill. It is an object of the present invention to provide a low-cost rolling equipment and a rolling method thereof, in which the number of rolling mills is reduced and the rolling equipment is reduced.

[0008]

In order to achieve the above object, a first reverse rolling mill for forward and reverse rolling of a material to be rolled supplied from a heating furnace, and a first reverse rolling mill disposed on an outlet side of the first reverse rolling mill. And a heat retaining coiler which is provided on the entry side of the first reverse rolling mill and keeps the temperature of each part of the coil substantially uniform to perform winding and rewinding.

A first reverse rolling mill for rotating the material to be rolled supplied from the heating furnace in a normal direction and a reverse direction; a second reverse rolling mill disposed on an outlet side of the first reverse rolling mill; A rolling equipment provided with a heat retaining coiler that is provided on the entry side of one reverse rolling mill and keeps the temperature of each part of the coil substantially uniform and performs winding and rewinding. When the material to be rolled is reversely rolled to 25 mm or less, the material to be rolled is wound around the heat retaining coiler, and the material to be rolled out from the heat retaining coiler is subjected to a first reverse rolling mill and a second reverse rolling mill.
The reverse rolling mill is set in tandem and finish rolling is performed.

[0010] Further, a first reverse rolling mill for forward and reverse rolling the material to be rolled supplied from the heating furnace, a second reverse rolling mill arranged on the exit side of the first reverse rolling mill, A rolling equipment provided with a heat retaining coiler that is provided on the entry side of one reverse rolling mill and keeps the temperature of each part of the coil substantially uniform and performs winding and rewinding. Reverse, and then perform normal rotation and reverse rotation of the first reverse rolling mill and the second reverse rolling mill in tandem, roll the material to be rolled to 25 mm or less, wind it up on the heat retaining coiler, and from the heat retaining coiler. The unrolled material to be rolled is finish-rolled in tandem with the first reverse rolling mill and the second reverse rolling mill.

[0011]

The first reverse rolling mill alone or the second reverse rolling mill is also tandemly rough-rolled, so that the rough rolling is thinly rolled to 25 mm or less and wound on a heat retaining coiler. When rolled to a coil of 25 mm or less and wound up into a coil, it becomes a thin plate, so the cooling becomes large, especially the coil end surface in contact with the outside air, so that the cooling is particularly large, and the temperature distribution inside and outside the coil becomes non-uniform. However, by using a heat retaining coiler, cooling can be prevented and rough rolling can be performed to a small thickness, so that finish rolling can be performed with two rolling mills.
As a result, the number of rolling mills can be greatly reduced, the rolling line can be shortened, and equipment costs can be reduced.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing the configuration of the present embodiment. A rolled material 2 of about 105 mm is supplied from the heating furnace 1.
The rolling line is composed of two reverse rolling mills F1 and F2 that perform forward and reverse rolling, and a heat retaining coiler that keeps the temperature of the coil substantially uniform at the entry side of the reverse rolling mill F1 and performs winding and rewinding. 3 are provided. Further, a down coiler 4 that winds up the finish-rolled coil is disposed downstream of the reverse rolling mill F2.

FIG. 2 shows a first rolling schedule. Rolled material 2 supplied from heating furnace 1 with a thickness of 105 mm
The case of rolling to a product of mm is shown. Reverse rolling mill F1
Roll forward from 105 mm to 80 mm, then reverse roll to 57 mm, and then roll forward to 40 mm.
It is reverse-rolled from 40 mm to 25 mm and wound around the heat retaining coiler 3. Next, it is rewound from the heat retention coiler 3, and the reverse rolling mills F1 and F2 are tandem-finished and finish-rolled.
Reverse rolling mill F1 to 15 mm, reverse rolling mill F
2. Roll to 9 mm. After rolling to 9 mm, it is wound around the down coiler 4.

FIG. 3 shows a second rolling schedule. The case where the material to be rolled 2 supplied from the heating furnace 1 with a thickness of 105 mm is rolled into a 2.0 mm product is shown. The reverse rolling mill F1 performs forward rolling from 105 mm to 80 mm and then reverse rolling to 60 mm. Next, the reverse rolling mills F1 and F2 are tandemly forward-rolled to form a reverse rolling mill F1.
To 40 mm and rolled to 25 mm with a reverse rolling mill F2. Next, reverse rolling is again performed in the reverse rolling mill F2 to obtain 13
mm, and then reversely rolled by a reverse rolling mill F1 to 7 m
After rolling to m, it is wound around a heat retaining coiler 3. Since the rolled material 2 rolled to 25 mm or less is immediately wound around the heat retaining coiler 3, the temperature is prevented from lowering. Next, the reverse rolling mills F1 and F2 are tandem-finished and finish-rolled. Unwind from heat retaining coiler 3 and reverse rolling mill F1 for 3.4
mm, and rolled to 2.0 mm with a reverse rolling mill F2.
After rolling to 2.0 mm, it is wound around the down coiler 4.

FIG. 4 shows a third rolling schedule. Rolled material 2 supplied from heating furnace 1 with a thickness of 105 mm
The case of rolling to 9 mm is shown. In this case, rough rolling is 35
mm, and there is no possibility that the temperature of the material to be rolled 2 drops so as to hinder the finish rolling, so that the heat retaining coiler 3 is not used. The reverse rolling mill F1 is rotated forward from 105 mm to 80 mm, then reversely rotated to 60 mm, forwardly rotated to 45 mm, and then reversely rotated again to 35 mm. Next, the reverse rolling mills F1 and F2 are tandem-finished and finish-rolled. It is rolled to 24 mm by the reverse rolling mill F1 and then rolled to 19 mm by the reverse rolling mill F2 and wound around the down coiler 4. .

As shown in the above rolling schedule, the reverse rolling is mainly performed by the reverse rolling mill F1, the number of rollings in the reverse rolling mill F2 is reduced, the roll surface is maintained in a good condition, and the surface quality of the product is improved. I have to. When the sheet thickness before the finish rolling is 25 mm or less, the heat retaining coiler 3 is used to prevent the temperature of the material 2 to be rolled before the finish rolling and prevent the temperature from becoming uneven.

Next, the heat retaining coiler of this embodiment will be described.
FIG. 5 is a cross-sectional view of the heat retention coiler, and FIG.
FIG. This heat retention coiler heats the mandrel 11 and the coil end face. One end of the mandrel 11 is detachably connected to the rotation driving device 32, and the other end is supported by a detachable outer support member 33. The outer support member 33 supports the mandrel 11 with an eccentric bearing 34. Eccentric bearing 34
And the mandrel 11 can be fixed and removed by a wedge 35. The mandrel 11 is formed of a hollow shaft.
It is attached by a support member 37 with a gap with the inner surface,
This support member 37 is supported by the outer support member 33.

An exhaust opening 38 is provided in the vicinity of the coil end position of the mandrel 11 so that combustion exhaust gas from the combustion device 36 is discharged along the coil end surface. In addition, a bearing 39 that supports a coil end surface heating device described later.
Is provided.

A coil end surface heating device 40 is provided on both end surfaces of the coil to heat the coil end surface and prevent cooling.
The heating device 40 for the coil end face is a short cylinder having an opening at the center for connection with the mandrel 11, a combustion chamber 41 having one end face closed by a side plate, and a grid provided on the other end face of the cylinder. And a radiator 42. The heating device 40 is supported by the bearing 39 of the mandrel 11, but the mandrel 11 rotates and the heating device 40 is stationary.
The heating device 40 is divided horizontally into two parts, and can be attached to and detached from the mandrel 11. The upper heating device 40 is attached and detached by a pulley 43, and the lower heating device 40 is raised and lowered by an elevator 44. An adjusting cylinder 45 that extends and contracts in the axial direction of the mandrel 11 is provided, and adjusts the heating device 40 according to the width of the coil 8.

Next, the operation of the heat retaining coiler will be described. Before the coil winding starts, a combustion gas premixed with air is blown into the mandrel 11 from the combustion device 36 and burned to heat the mandrel 11. In setting the heating device 40 on the coil end face, first, the lower heating device 40
Is lifted up to a specified position by an elevator 44, the upper heating device 40 is lowered thereon by a pulley 43, and the two are integrally joined, and then moved to a position corresponding to the coil width by an adjusting cylinder 45. Next, the winding of the coil 8 is started, and before and after this, a combustion gas is supplied to the combustion chamber 41 and burned to heat the radiator 42 to perform radiation heating of the coil end face. When the winding is completed, rewinding is performed. During the rewinding, heating of the coil end surface by the heating device 40 is performed.

[0021]

As is clear from the above description, the present invention provides rough rolling by two reverse rolling mills and a heat retaining coiler.
Since finish rolling can be performed, the equipment length is short,
A hot rolling line with low equipment costs can be realized. In addition, a high-quality product can be obtained by keeping the roll surface in a good state by reducing the number of times of rolling in the reverse rolling mill on the downstream side in the rolling schedule.

[Brief description of the drawings]

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

FIG. 2 is a diagram showing a first rolling schedule.

FIG. 3 is a diagram showing a second rolling schedule.

FIG. 4 is a diagram showing a third rolling schedule.

FIG. 5 is a sectional view of a heat retention coiler.

FIG. 6 is a view as viewed in the direction of arrows AA in FIG. 5;

FIG. 7 is a diagram showing a conventional rolling facility.

FIG. 8 is a view showing another conventional rolling equipment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Heating furnace 2 Material to be rolled 3 Heat retention coiler 4 Down coiler 8 Coil 11 Mandrel 32 Rotation drive device 33 Outside support material 34 Eccentric bearing 35 Wedge 36 Combustion device 37 Support material 38 Exhaust opening 39 Bearing 40 Coil end surface heating device 41 Combustion chamber 42 Radiator 43 Pulley 44 Elevator 45 Adjusting cylinder F1 Reverse rolling mill (first reverse rolling mill) F2 Reverse rolling mill (second reverse rolling mill)

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Hisahiko Fukase 1st Shin-Nakahara-cho, Isogo-ku, Yokohama-shi, Kanagawa Pref. Ishikawajima-Harima Heavy Industries, Ltd. Yokohama No. 2 Factory JP-A-61-206507 (JP, A) JP-A-59-110404 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B21B 1/00-1/46 B21B 45 / 00 B21C 47/00

Claims (3)

(57) [Claims] 1. A material to be rolled supplied from a heating furnace is rotated forward,
A first reverse rolling mill for reverse rolling, a second reverse rolling mill arranged on the exit side of the first reverse rolling mill, and a temperature of each coil portion provided on the entrance side of the first reverse rolling mill to be substantially uniform. A rolling facility comprising: a heat retaining coiler that retains heat and performs winding and rewinding. 2. The material to be rolled supplied from the heating furnace is rotated forward,
A first reverse rolling mill for reverse rolling, a second reverse rolling mill arranged on the exit side of the first reverse rolling mill, and a temperature of each coil portion provided on the entrance side of the first reverse rolling mill to be substantially uniform. In a rolling method of a rolling equipment provided with a heat retaining coiler for performing heat retention and winding and rewinding, the first reverse rolling mill is rotated forward and reverse to roll the material to be rolled to 25 mm or less. A method for rolling rolling equipment, comprising: rolling a material to be rolled out from a heat retaining coiler using a first reverse rolling mill and a second reverse rolling mill in tandem. 3. The material to be rolled supplied from the heating furnace is rotated forward,
A first reverse rolling mill for reverse rolling, a second reverse rolling mill arranged on the exit side of the first reverse rolling mill, and a temperature of each coil portion provided on the entrance side of the first reverse rolling mill to be substantially uniform. In a rolling method of a rolling equipment provided with a heat retaining coiler for performing heat retention and rewinding, the first reverse rolling mill is rotated forward and reverse, and then the first reverse rolling mill and the second reverse rolling mill are rotated.
The reverse rolling mill is rotated in tandem to perform normal rotation and reverse rotation, and the material to be rolled is rolled to 25 mm or less and wound on the heat retaining coiler. The material to be rolled out from the heat retaining coiler is treated as a first reverse rolling mill. A rolling method for rolling equipment, wherein the second reverse rolling mill is tandem and finish rolling is performed.