JP3067619B2 - Continuous casting and rolling equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuous casting and rolling facility for metal sheets and the like, and more particularly to rolling of a continuous casting and rolling facility.

[0002]

2. Description of the Related Art Various methods have been proposed as techniques for increasing the rolling reduction per pass and improving the rolling efficiency.

In Japanese Unexamined Patent Publication No. Sho 60-184407, "rolling machine" is provided with at least one pair of reinforcing rolls and at least one working roll which comes into contact with the reinforcing rolls and performs a direct rolling operation. Rolling mills aiming to increase the amount have been proposed.

Japanese Patent Application Laid-Open No. 61-56708, "Continuous Rolling Equipment Line" discloses a continuous heating system in which a multiplex rolling press roll assembly and a multiplex high-pressure roll assembly having a small-diameter work roll are placed in the same housing or separately. Some are installed in cold rolling equipment.

[0005] In a conventional hot rolling equipment, a continuous casting machine requires two hours.
A slab having a thickness of 00 mm or more is cast, and the bar is manufactured by performing unidirectional rolling or reverse rolling using a group of coarse rolling mills arranged in a rough rolling mill using the slab as a base material. Next, the bar material is rolled by a finishing tandem rolling mill group in which a plurality of finishing rolling mills are arranged to have a predetermined thickness, and is wound by a down coiler through a cooling device to form a steel strip. Such hot rolling equipment is intended for mass production, and is an extremely large-scale equipment having an overall equipment length of 300 m or more from the upstream heating furnace to the final winding. In recent years, recycling has become more important due to the large amount of scrap scrap, and the idea that small-scale and small-scale production facilities should be installed in a decentralized manner rather than a centralized large-scale mass-production system has become popular. Rolling equipment is being demanded.

[0006] As a method for achieving small-scale equipment, it has been considered to reduce the number of rolling stands. For example, in JP-A-63-90303, "Hot rolling equipment", at least one of the hot rolling mills is a reverse rolling mill, and a hot rolling machine in which an edger is installed on the entrance or exit of the reverse rolling mill. Rolling equipment has been proposed. In this hot rolling equipment, one or more sets of reverse rolling mills and edgers are set as one set and installed in front of the finishing rolling mill group, reverse rough rolling is performed, and then finishing tandem rolling is performed using all rolling mills. is there.

[0007] Japanese Patent Application Laid-Open No. 63-132703 entitled "Method and Apparatus for Casting a Sheet Material with Multi-stage Roll Stand Continuous Rolling Apparatus"
Or four rolling roll stands,
One rolling roll stand proposes rolling with a large work roll diameter.

Further, it is conceivable to reduce the number of rolling stands and the number of rolling passes by improving the rolling efficiency, and the following conventional techniques have been proposed. For example, in Japanese Patent Application Laid-Open No. 55-22500, "Hot rolling equipment for steel products", a high-pressure rough rolling mill is arranged in front of a finishing rolling mill row.

[0009]

In Japanese Patent Application Laid-Open No. 60-184407, it is possible to reduce the number of times in one stand, but two work rolls are in contact with the same reinforcing roll, so that two work rolls are required. The rotation peripheral speed of the roll becomes the same. Since the material to be rolled extended in the first rolling cannot be rolled out by increasing the speed in the next rolling, the material to be rolled tends to stagnate between the two work rolls. In order to improve this phenomenon, it is necessary to use means such as applying tension from the front and rear sides, and when this method is applied to an actual machine, there is a disadvantage that the front and rear devices become excessively large.

Japanese Patent Application Laid-Open No. 61-56708 discloses that the pressure can be reduced strongly in the same stand, but the distance between the push-in roll structure and the multiple-type high-pressure roll structure is limited by the structure of the roll bearing portion, and the structure is arbitrary. Interval. In particular, in low-speed rolling, scale is generated on the surface of the material to be rolled during this arbitrary distance, so that it is necessary to perform descaling. If this descaling is performed on a low-speed rolled material, the temperature of the rolled material drops, and there is a disadvantage that the rollability is impaired.

Japanese Patent Application Laid-Open No. 63-90303 discloses a problem that a complicated handling technique is required for performing reverse rolling, and a large space for processing a plate material after even-pass rolling is required in front of finish rolling. was there.

Japanese Unexamined Patent Publication (Kokai) No. 63-132703 discloses that when the work roll becomes large, the rolling load increases, and it is necessary to arrange a larger-diameter reinforcing roll having a bearing part strength capable of withstanding the rolling load. Become complicated.

Japanese Patent Application Laid-Open No. 55-22500 uses a slab indenting device and a drawing device for performing high-pressure rough rolling, which complicates the rolling method and rolling equipment, and furthermore, a high-pressure rough rolling mill and a finish rolling machine. There is a problem that a space for the drawing device is required between the device and the machine.

[0014] It is an object of the present invention to provide a continuous casting and rolling facility that performs rolling capable of reducing the pressure in a narrow space, thereby saving labor in the rolling facility and preventing loss of heat of the rolled material and reducing the generation of scale. It is an object of the present invention to provide a continuous casting and rolling equipment capable of performing such operations.

[0015]

The continuous casting and rolling equipment according to the present invention is a continuous casting and rolling equipment in which a continuous casting equipment, a rough rolling mill and a finish rolling mill are sequentially arranged. Upper and lower work rolls, and upper and lower work rolls respectively supporting the upper and lower work rolls, and a rolling-down device that generates a rolling load on a bearing portion of the upper and lower work rolls. At least one is provided with two or more, and at least one of the reinforcement rolls supporting two adjacent work rolls of the two or more installed work rolls is a plurality of divided reinforcement rolls divided in the roll axis direction. Are arranged in a zigzag pattern.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIG.

FIG. 1 is a view of a rolling mill as viewed from the front, and the material flows from left to right and is rolled every moment.

In the present embodiment, two work rolls are arranged in the housing 12 at the top and bottom, respectively.

The upper work roll 1 on the rolled material input side is supported by a reinforcing roll 5 and a split reinforcing roll 6, and the upper work roll 3 on the rolled material outlet side is supported by a split reinforcing roll 6 and a reinforcing roll 7.

The divided reinforcing rolls 6, which are located at the center of the reinforcing rolls and support two adjacent upper working rolls 1 and 3, are arranged in a staggered manner in the roll axis direction. It is in contact with the roll 1 and the upper work roll 3.

Similarly, the lower work roll is supported by two lower work rolls 2 and 4 by three reinforcing rolls (the center is a divided reinforcing roll).

The work rolls 1-4 directly roll the material,
The rolling reaction force received by the work roll is transmitted from the bearings of the reinforcing rolls to the rolling-down devices 8 to 11 via the reinforcing rolls 5 to 7, and balances the screw of the rolling-down device and the rolling load given from the housing 12 side.

By arranging in this manner, two reinforcing rolls correspond to one work roll, so that the work rolls can be stably restrained.

Further, since the pressing devices are provided on the inlet and outlet sides of the material, the amount of pressing can be adjusted respectively.

The work rolls that are in direct contact with the rolled material have a high wear rate on the roll surface, and are frequently replaced. Therefore, the bearing housings 13 to 16 are provided with 17, 18 reinforcing rolls so that the work rolls can be individually replaced. It is divided into a bearing box.

The reinforcing roll 6 is divided into several parts in the axial direction, and supports one work roll and two work rolls, respectively. By oscillating the split rolls in the axial direction, it is possible to prevent the edge marks of the split rolls from being transferred to the material.

Further, the gap between the bearing portions of the reinforcing roll is adjusted by the cylinders 19 and 20 built in the bearing box of the lower reinforcing roll 18, so that the reinforcing roll is deflected and the working roll in contact with it is removed. It is also possible to control the thickness of the rolled material.

In this rolling mill, four housings are accommodated in one housing.
The rolling mills are arranged in two rows close to each other.
It can be rolled twice by passing the rolled material twice. That is, there is an advantage that the equipment can be shortened as compared with a conventional rolling mill having individual housings.

With such a configuration, it is possible to perform a strong reduction in a narrow space, so that the rolling equipment can be shortened, the heat of the rolled material can be reflected on the reduction without loss, and the generation of scale can be reduced. Can be used as a rolling mill. In addition, by employing the rolling mill, compact hot rolling equipment can be realized.

FIG. 2 shows that two work rolls are arranged only on the upper side of the rolled material and supported by three reinforcing rolls. The three central reinforcing rolls are of a split type.

In this manner, the rolling is performed in substantially the same manner as the rolling mill shown in FIG. 1, the number of rolls can be reduced, and the work of changing the reinforcing rolls can be simplified.

FIG. 3 shows that a work roll and a reinforcing roll have a 21
~ 24 rolling mills.

The two work rolls are supported by two intermediate rolls, and the two intermediate rolls are supported by three reinforcing rolls. At this time, the central reinforcing roll of the three reinforcing rolls is of a split type.

In this case, since the work roll that is in direct contact with the directly rolled material to be actually rolled is supported by the reinforcing roll via the intermediate roll, there is an effect of preventing the marks of the divided reinforcing rolls from being transferred to the material. .

Further, in this type of rolling mill, since a work roll can be made small in diameter, it is possible to roll a hard material or a thin plate.

When the same reduction is performed, a small-diameter roll having a short contact arc length can reduce the rolling load and reduce the flatness of the roll, so that the reduction can be increased.

FIG. 1, which is an embodiment of the present invention, shows that two rolling mills having the above-mentioned work rolls are housed in one housing, and the conventional two- and four-high rolling mills are used. 2.5 for work rolls of about 500-800 mm
Up to 4 times reduction is possible in one pass.

FIG. 4 shows an example in which the intermediate rolls 25 and 26 are inserted between the work rolls and the reinforcing rolls in the rolling mill shown in FIG. 2 to prevent the transfer of marks on the divided reinforcing rolls.

In this case, similarly to the rolling mill shown in FIG. 2, the number of rolls can be reduced, so that the equipment can be saved and the roll change can be simplified.

FIG. 5 shows a rolling mill in which a bearing box of 27 to 29 reinforcing rolls is provided for each roll for the purpose of changing the reinforcing rolls.

In this case, it is possible to individually change the rolls according to the wear state of the rolls.

Here, in FIGS. 1 to 5 which are one embodiment of the present invention, the reduction device 8 to 11 is not an electric screw but a hydraulic cylinder, so that a highly responsive reduction control and a large rolling load can be achieved. It becomes possible.

By providing a mechanism for shifting the work roll in the axial direction, the effect of dispersing the wear of the work roll can be obtained.

FIG. 6 is a view showing a hot rolling equipment for casting employing the rolling mill of the present invention.

The slab 45 cast by the continuous casting facility 30 is adjusted to a rolling temperature by the heater 31.

Thereafter, it is width-rolled by a width rolling machine 32 and sent to a twin rolling mill 34 of a rough rolling machine which is one of the present invention. Prior to rolling in the twin rolling mill 34, descaling is performed by the descaler 33 and rolling is performed.

Behind the twin rolling mill 34, a heater 35 is provided, which performs heating and soaking for the next rolling, and is sent to a finishing mill 37.

As the finish rolling mill, various rolling mills such as a work roll shift mill and a cross mill can be considered. After the finishing mill 37, the cooling device 38 cools the pinch roller 3
9. The carousel coiler 48 passes through the cutting machine 40 while running.

At the beginning of winding, the chain wrapper 41 is used, and the coil 46 whose winding has been completed is carried out of the rolling line by the coil car 42.

When the sheet material is produced as a sheet material instead of a coil, the carry-out table 44 descends on the passing line, and the plate material 47 can be carried out to the carry-out table 43.

Since the casting and the hot rolling are completely continuous in this equipment, the equipment is cut by a constant amount by the running cutter 40.

The continuous casting equipment 30 is for casting a slab 45 of 100 mm or less, and can obtain a coil 46 or a sheet material 47 having a desired thickness by only unidirectional rolling.

Also, when the continuous casting equipment 30 is of a type in which unsolidified rolling or rolling is performed in the continuous casting equipment to produce a slab, the temperature drop in the twin rolling mill 34 can be minimized. It also effectively acts on the upstream temperature drop caused by rolling.

Since the continuous casting equipment 30 is one strand, it is a production equipment of one million tons / year. However, a plurality of the continuous casting equipment 30 is provided, and the slab 45 is cut to an arbitrary length. A method of further increasing the production amount by carrying out and rolling out to and after the twin rolling mill 34 while rolling is also considered as an application.

In this case, since the rolling speed can be increased, a normal hot slip mill without the heater 35 can be used, and the twin rolling mill 34 of the present invention is arranged in front of the hot strip mill. This is shown in FIG.

By arranging the twin rolling mill 34, the rolling speed can be set to the minimum speed that does not require the heater 35, so that the cooling length after rolling can be shortened. For example, the equipment length can be shortened and the equipment can be made compact as a whole.

As described above, in this embodiment, at least two rolls are made so that they can be rolled at least twice in the same housing.
Work rolls were arranged. It is assumed that the distance between the plurality of work rolls is as close as possible by the structure of the bearing between the work rolls.

One of the reinforcing rolls is disposed between the work rolls, and the reinforcing roll is divided into rollers constituting a roller that comes into contact with one of the work rolls and the other roller that comes into contact with the other work roll.

The divided rollers can be adjusted to move in and out of the work roll. The work roll is movable in the roll axis direction so that a roll bending force can be applied. Further, a grinding device for performing roll grinding during rolling is attached to the work roll. A high-speed roll is used as a work roll. The work roll or the reinforcing roll is varied in the axial diameter of the roll. One or both of the split roller and the work roll are repeatedly reciprocated in the roll axis direction. An intermediate roll is arranged between the work roll and the reinforcing roll. A work roll having a relatively small diameter is used to drive a reinforcing roll or an intermediate roll.

A relatively thin slab having a thickness of 100 mm or less is cast from a continuous casting facility, and a rolling mill having the above means is arranged in the direction of travel of the slab, and the slab is continuously transferred to the rolling mill. And rolled one-pass to a predetermined shape. Further, after the rolling mill, at least one rolling mill constituted by a roll group having a continuous roll profile is arranged.

A compact facility can be provided by reducing the number of rolling mills by performing rough rolling at a low speed and reducing the pressure at each stand.

That is, in this embodiment, by arranging a plurality of rolling roll groups close to each other in the same housing, the amount of scale of the material to be rolled during a plurality of rolling can be reduced. If the amount of generated scale is small, the amount of water in descaling can be reduced, and in some cases, descaling can be omitted, and the temperature drop of the material to be rolled can be minimized, and strong rolling can be performed at low speed.

On the other hand, if the diameter of the work roll is small, the rolling load and the driving torque are reduced, and it is possible to perform a strong reduction. When high pressure reduction is possible, the number of rolling mills can be reduced, so that a compact rolling mill group can be provided. In the case of a work roll whose drive unit is reduced to a diameter that cannot withstand the drive torque required for rolling, if the work roll is reduced, the reinforcing roll supporting the work roll or the intermediate roll is driven to reduce the thinned sheet material. I can do it.

From the viewpoint of low-speed high-pressure rolling, a small-diameter work roll mill is preferred. The smaller the work roll diameter, the shorter the contact arc length in rolling, so that the rolling load is reduced, the driving torque is reduced, and the temperature rise of the roll can be reduced. As a result, the rolling energy can be reduced.

Further, by inserting an intermediate roll between the work roll and the reinforcing roll, transfer of edge marks to the work roll caused by the edge of the roll end of the divided reinforcing roll at the center of the three reinforcing rolls is reduced. Thus, the surface quality of the rolled material can be improved.

Further, the rolling mill can adjust a sheet crown.

By using a high-speed roll as the work roll and installing a roll polishing device in the rolling mill, the frequency of changing rolls in rolling under severe conditions of high pressure and low speed can be reduced.

Further, if the distance between the roll stands is long, the meandering amount of the rolled material tends to increase. On the other hand, in a rolling mill in which a plurality of work rolls are arranged close to one housing, the distance between the work roll and the next work roll is short, so that the amount of meandering can be minimized.

When continuously or cut slabs are continuously rolled on the output side of the continuous casting apparatus, the rolling speed is almost the same as the casting speed, and even in high-speed casting, the rolling speed is 5 m at the entrance to the rolling mill.
/ Min speed. In such a case, the rolling speed is extremely low, but the use of the above-mentioned rolling mill enables a strong reduction, and furthermore, since the temperature drop can be minimized, the reheating before re-rolling after this rolling can be minimized. . Further, in the above-described rolling mill arranged in the vicinity of the work roll, the divided portion of the divided reinforcing roll may be transferred to the material to be rolled as a mark. In this case, the transfer marks can be reduced by rolling with a rolling mill configured by a roll group having a conventional continuous roll profile.

[0070]

According to the present invention, strong rolling can be performed in a narrow space, so that the rolling equipment can be shortened, the heat of the rolled material can be reflected on the rolling without loss, and the generation of scale can be reduced. It can be a rolling mill capable of performing such operations.
Further, by employing the rolling mill, a compact continuous casting and rolling facility can be realized.

[Brief description of the drawings]

FIG. 1 is a rolling mill of a continuous casting and rolling facility according to one embodiment of the present invention.

FIG. 2 is a rolling mill of a continuous casting and rolling facility according to one embodiment of the present invention.

FIG. 3 shows a rolling mill having an intermediate roll of a continuous casting and rolling facility according to one embodiment of the present invention.

FIG. 4 shows a rolling mill having an intermediate roll of a continuous casting and rolling facility according to one embodiment of the present invention.

FIG. 5 is a rolling mill of a continuous casting and rolling facility in which a bearing box is divided according to one embodiment of the present invention.

FIG. 6 shows a continuous casting and rolling facility according to one embodiment of the present invention.

FIG. 7 is a row of rolling mills of a continuous casting and rolling facility according to one embodiment of the present invention.

[Explanation of symbols]

1-4 work rolls, 5 upper reinforcement rolls on the entrance side, 6 divided reinforcement rolls, 7 upper reinforcement rolls on the exit side, 8-11 reduction device, 12 housing, 13-16 work roll bearing box, 17 , 18 ... reinforcing roll bearing box, 19, 20 ... hydraulic cylinder, 21-24, 25, 26 ... intermediate roll, 27
~ 29 ... Reinforced roll bearing box, 30 ... Continuous casting equipment, 3
1, 35: heater, 32: width rolling machine, 33, 36: descaler, 34: twin rolling mill, 37: finishing rolling machine, 38: cooling device, 39: pinch roller, 40: cutting machine, 41: chain Wrapper, 42 ... coil car,
43, 44: carry-out table, 45: cast slab, 46: coil, 47: plate material, 48: carousel coiler.

Continuation of the front page (56) References JP-A-7-308701 (JP, A) JP-A-63-174702 (JP, A) JP-A-4-66205 (JP, A) JP-A-8-174001 (JP) JP-A-6-262215 (JP, A) JP-A-60-184407 (JP, A) JP-A-61-56708 (JP, A) JP-A-63-132703 (JP, A) 63-90303 (JP, A) JP-A-55-22500 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B21B 13/22 B21B 13/14 B21B 29/00 B22D 11 / 12 B21B 1/46

Claims (8)

(57) [Claims] 1. A continuous casting and rolling facility in which a continuous casting facility, a rough rolling mill and a finish rolling mill are sequentially arranged, wherein the rough rolling mill includes upper and lower working rolls arranged above and below a rolled material, and the upper and lower working rolls. Upper and lower work rolls are provided, and at least one of the upper work roll and the lower work roll is installed, and two or more are installed. At least one of the reinforcing rolls supporting two adjacent working rolls of the divided work rolls is a plurality of divided reinforcing rolls divided in the roll axis direction, and the plurality of divided reinforcing rolls are arranged in a staggered manner. And continuous casting and rolling equipment. 2. The continuous casting and rolling plant according to claim 1, wherein each of the plurality of divided reinforcing rolls arranged in a staggered manner is in contact with one work roll, and is one of two adjacent work rolls. A continuation wherein one work roll is supported by at least one of the plurality of divided reinforcement rolls, and the other work roll is supported by a divided reinforcement roll other than the divided reinforcement roll supporting the one work roll. Casting rolling equipment. 3. The continuous casting and rolling facility according to claim 1, wherein at least one of the upper work roll and the lower work roll is installed, and a reinforcing roll for supporting the two installed work rolls is provided. Three, the first work roll is supported by a first reinforcement roll and a second reinforcement roll, and the second work roll is supported by a second reinforcement roll and a third reinforcement roll. A continuous casting and rolling facility wherein a central second reinforcing roll of the rolls is a split reinforcing roller which is split in the axial direction. 4. A continuous casting and rolling facility according to claim 1, further comprising a displacement means for independently displacing each of said plurality of divided reinforcing rolls in a roller radial direction. Continuous casting and rolling equipment. 5. A continuous casting and rolling plant according to claim 1, wherein said means for moving each work roll in the roll axis direction, and roll bearings provided at both ends of said work roll. And a bearing moving means for moving the roll in the radial direction of the roll. 6. The continuous casting and rolling facility according to claim 1, wherein an intermediate roll is disposed between said work roll and said reinforcing roll. 7. The continuous casting and rolling plant according to any one of claims 1 to 6, optionally at least one of the work rolls are supported by the split rolls and the divided rolls in the roll axis direction Continuous casting and rolling equipment provided with a roll reciprocating means capable of reciprocating a distance of. 8. The continuous casting and rolling facility according to claim 6, further comprising a roll reciprocating means for reciprocating the intermediate roll by an arbitrary distance in the roll axis direction. .