JPH0747167B2 - Width rolling method for continuous casting - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a width rolling method for a continuous casting material (hereinafter, abbreviated as continuous casting material), and particularly to a hot strip produced by rolling a thin continuous casting material. The present invention relates to a width-rolling method for continuously cast material when manufacturing a steel sheet.

[Conventional technology]

When manufacturing hot-rolled steel sheets, the plate width adjustment rolling (width rolling) is performed in advance in the process before the plate thickness rolling, and then the sheet thickness rolling is performed by the thickness reducing mill. The processing involved width-adjusting rolling of a continuous cast material (slab) having a large plate thickness of about 200 to 300 mm. As a typical example thereof, as disclosed in, for example, JP-A-52-143949, there is one in which width rolling is performed by a vertical roll rolling machine VSB at a position where the plate thickness is large. Further, in recent years, rolling work tends to be systematized in a continuous casting process, rolling process, etc. from the viewpoint of labor saving and rationalization, as disclosed in, for example, Japanese Patent Laid-Open Publication No. 50-131651.

By the way, recently, as a continuous casting machine used in the continuous casting process, a high speed continuous casting machine using a twin belt system has been recently developed, and it is possible to reduce the thickness of the continuous casting material (about 20 to 30 mm). However, in the width rolling of high-speed thin plate continuous cast material,
The following points should be improved.

[Problems to be solved by the invention]

The thickness of the continuous cast material produced by the twin-belt high-speed thin plate continuous caster is about 20 to 30 mm, while the plate width is required to be about 700 to 1600 mm as in the conventional case. In this way, the high-speed continuous cast material has a plate thickness that is 1/10 that of conventional continuous cast materials.
Despite being thin, the plate width is the same as before, so the rigidity is small. As a result, when a width rolling force is applied from both sides of the continuous cast material toward the width center with a pair of width rolling rolls during the width rolling process of the continuous cast material, the continuous cast material is likely to buckle in the width direction, resulting in large width rolling. It was difficult to apply force to the continuous cast material.

The present invention has been made in view of the above points, and an object thereof is to prevent the buckling of the continuous cast material by applying a useful tension in addition to the width rolling force to the continuous cast material in the width rolling process of the continuous cast material. Along with
Without using a special one as this tension applying mechanism,
An object of the present invention is to provide a rational width rolling method capable of applying a tension effective for preventing the buckling by utilizing an existing pinch roller mechanism and a reduced thickness rolling roller mechanism used for rolling equipment.

[Means for solving problems]

The present invention, in order to achieve the above object, a continuous casting material produced in a thin plate shape by a continuous casting machine, is fed to a width rolling roller mechanism before performing a thickness reduction rolling by a thickness reduction rolling roller mechanism, and the width In the method of rolling the continuous cast material width by applying rolling force from both sides in the width direction to the width center by the rolling roller mechanism, the continuous casting process, width rolling and thickness reduction rolling process are systematized in series. A method of continuously bending the continuous cast material hung down from the continuous casting machine by a pinch roller of a bending mechanism provided in the preceding stage of the width rolling roller mechanism and guiding it to the width rolling roller mechanism, or continuous casting In a system in which the process and the width rolling and the thickness reduction rolling process are separately performed, a method of guiding the continuously cast material once wound to the width rolling roller mechanism through the pinch roller of the continuous casting material rebending mechanism is used. Mechanism or bending of continuous cast material Applying tension to the continuous casting material passing through the width rolling roller mechanism by driving the thickness reduction rolling roller mechanism while stopping or reversely rotating the motor that drives the pinch roller of the straightening mechanism. Is characterized by.

[Action]

According to the rolling method as described above, during rolling work,
By driving the motor of the bending mechanism or the continuous casting material re-bending mechanism, the pinch roller is moved in the forward direction (direction in which the continuous casting material is fed).
When it is rotated to, the continuous cast material is set so as to reach the width rolling roller mechanism and the reduced thickness rolling roller mechanism.

And, when performing the rolling process after this setting,
The motor is stopped to put the pinch roller in a non-driving state, or the motor is reversely rotated as necessary to apply a reverse torque to the pinch roller in the advancing direction of the continuous cast material and reduce the thickness. By driving the roller mechanism, the part of the continuous cast material that passes through the width rolling roller mechanism is driven by the non-driving or reverse torque of the pinch roller on the upstream side and the reduced thickness rolling roller mechanism on the downstream side. Sufficient tension is applied by the cooperation with the generated driving force (forward torque).

Therefore, two stresses, the tension and the compressive stress by the width rolling roller, act on the width rolling portion of the continuous cast material. Therefore, the plate width contraction in the width direction during width rolling of the continuous cast material is facilitated, and the width rolling process is facilitated, and since the tension effectively acts on the continuous cast material, buckling occurs in the plate width direction. It will be difficult.

Further, since the buckling is unlikely to occur, it is possible to apply a sufficiently large width rolling force to the width rolling portion of the continuous cast material, and as described above, since the width rolling processing is easy to perform,
The width rolling amount can be greatly increased.

〔Example〕

An embodiment of the present invention will be described with reference to FIGS.

FIG. 1 is a system diagram in which the width rolling method according to the present invention is applied to a system in which a continuous casting process and a rolling process are directly connected, and FIG. 2 is a sectional side view of a width rolling roller mechanism used in the above embodiment, The figure is a partially omitted sectional plan view of the width rolling roller mechanism.

In FIG. 1, 1 is a tundish, 2 is a twin-belt type high-speed continuous casting machine (hereinafter, abbreviated as continuous casting machine), and the continuous casting machine 2 is a pair of guide rollers 3, 4 which are guided. Belts 6 are arranged opposite to each other. Then, the molten metal is poured from the tundish 1 between the belts 6, and the molten metal is cooled and shaped to manufacture a thin continuous cast material 7. This continuous cast material 7 is
The bending force is corrected from the vertical direction to the horizontal direction by receiving the pressing force of the front pinch rollers 10 and 11 and the rear pinch rollers 12 and 13 built in the stand 9 of the bending machine 8. Pinch roller
11, 13 are reduced by the reduction cylinders 14, 15. A motor 16 drives the bending machine 8.

Reference numeral 17 is a width rolling roller mechanism, which is a continuous cast material 7 with straightening and bending.
In order to adjust the width, the width is rolled to narrow the plate width to a predetermined width. As shown in FIG. 3, the width rolling roller mechanism 17 includes a pair of width rolling rollers 18, 18 for width rolling.
Are arranged so as to sandwich the running line of the continuous cast material 7, and the continuous cast material 7 passing by each width rolling roller 18 is subjected to a rotary rolling force from both sides of the strip width in the width center direction (arrows A and B directions), Rolling is performed. Further, as shown in FIG. 2, the width rolling roller 18 is supported by a pair of upper and lower roller bearings 19 and 20 and is built in the stand 21. 22,23 and 24,25
Is a continuous cast material pressing roller arranged at the front and rear positions of the width rolling roller 18, respectively. Upper roller of the presser roller
22, 24 are pressed by the cylinder 26.

Reference numeral 27 denotes a reduced-thickness rolling roller mechanism, which rolls the continuous cast material 7 after width rolling to a predetermined plate thickness. The thickness reduction rolling roller mechanism 27 includes work rollers 28 and 29 and pressing rollers 30 and 31.
And a drive motor 32 that gives a driving force to the work rollers 28 and 29.

Reference numerals 33 and 34 denote second and third thickness reducing rolling roller mechanisms for further reducing the continuous cast material 7 rolled by the thickness reducing rolling roller mechanism 27 to a predetermined thickness. It is the same. Reference numerals 35 and 36 are tension measuring mechanisms for measuring the inter-stand tension of the reduced thickness rolling roller mechanisms 27, 33 and 33, 34.

Next, the operation of this embodiment will be described.

In such a continuous casting / rolling system, the pinch rollers 10 and 12 of the bending machine 8 are preliminarily set before the rolling operation is performed.
Drive motor 16 in the forward direction (rotation in the direction in which continuous cast material 7 is fed)
The continuous cast material 7 is set so as to reach the width rolling roller mechanism 17 and the thickness reducing rolling roller mechanism 27 by rotating the rolling member 7, and after the setting, a series of rolling steps are performed as follows. When the continuous cast material 7 is set so that it can be rolled, the drive motors 16 of the pinch rollers 10 and 12 of the bending machine 8 are stopped and the pinch roller 1
When 0, 12 are in the non-driving state and the thickness reducing rolling roller mechanism 27 is driven in this state, the pinch rollers 10, 11, 12, 1 at this time are driven.
The non-driving force of 3 and the driving force of the reduced thickness rolling roller mechanism 27 cooperate with each other to apply tension to the continuous cast material 7 between the bending machine 8 and the reduced thickness rolling roller mechanism 27.

Therefore, in the continuous cast material 7 passing through the width rolling roller mechanism 17,
Forward and backward tension is provided. In addition, if a braking current is passed through the drive motor 16 as necessary to drive the pinch rollers 10 and 12 of the bending machine 8 in a direction opposite to the traveling direction of the continuous cast material 7, the width direction is further increased. It is possible to increase the tension of the continuous cast material 7 in the rolling process. And
When such a tension is applied to the continuous cast material 7, a width rolling force is applied to the continuous cast material 7 by the width rolling rollers 18, 18 from both sides of the continuous cast material 7 toward the center. In the rolling section, two stresses, tension and compressive stress due to the width rolling rolls, act, so that the strip width compression in the width direction during the width rolling becomes easy. Further, since tension is applied, it is possible to effectively prevent buckling of the continuous cast material 7 in the plate width direction.

When tension is applied to the continuous cast material 7 using the driving force of the thickness reducing rolling roller mechanism 27 as described above, this tension F can be expressed by the following equation.

F = Bhk / 4ρ Here, B is the continuous cast material plate width, h is the continuous cast material plate thickness, k: bending deformation resistance, ρ: bending radius. Therefore, for example, B = 1000m
If m, h = 30 mm, k = 10 kg / mm ² , ρ = 1000 mm, then F = 9
Tons of tension are required. After the width rolling, the continuous cast material 7 reaches the thickness reducing rolling roller mechanism 27 to reduce the plate thickness.

In the above embodiment, the driving force of the width rolling roller 18 of the width rolling roller mechanism 17 is driven by a dedicated power source, but a power source for directly driving the width rolling roller 18 is not provided, and the width rolling is performed. The power required for the roller mechanism 17 is
It can be given by the driving force of the thickness reducing rolling roller mechanisms 27, 33, 34 in the next step, that is, the power of the drive motors 32, 37, 38 of the thickness reducing rolling roller mechanisms. In this case, power is applied to the bending machine 8 during rolling, and the power of the width rolling roller mechanism 17 is also given by the power of the thickness reducing rolling roller mechanisms 27, 33, 34, etc. The required power of the reduced-thickness rolling roller mechanism per hit is usually 2000 to 4000 kW, which is about 10 times as large as the total power required for width rolling or bending of continuous cast material, and therefore, It is easy to apply these powers by means of the reduced thickness rolling roller mechanism. That is,
For example, extra power may be applied to the drive motor 32 of the first reduced-thickness rolling roller mechanism 27 by an amount corresponding to the power required for bending and width rolling. By doing so, the rollers of the width rolling roller mechanism 17 are brought into a non-driving state, and the non-driving of the roller mechanism 17 and the bending machine 8 and the driving force of the thickness reducing rolling roller mechanism 27 cooperate with each other. Even greater tension is applied to the continuous cast material 7 between 17 and 27, and as a result, even if the continuous cast material 7 is thin, a large width rolling amount can be rolled.

Therefore, the cross-sectional dimensions of the thin plate continuous cast material 7 handled in the above examples are as follows: plate thickness 20 to 30 mm, plate width 700 to 1600 m
The continuous casting material 7 is manufactured at a casting speed of 15 m / min. In addition, the temperature of the continuous casting material in the width rolling section is 900 to 115.
It is 0 ° C. Under such conditions, the width rolling amount in the state where tension is not applied as in the present embodiment was limited to 10 mm or less for preventing buckling in the width rolling portion, but in the present embodiment, According to this, under the same conditions, width rolling with a width rolling amount of about 50 mm was possible. Further, by increasing the width rolling amount as described above, it is possible to significantly change the width of the continuous cast material at one time in the width rolling step, and it is possible to significantly improve the operation efficiency of the rolling operation.

Furthermore, according to this embodiment, the tension applied to the continuous casting material 7 is
Effectively utilizing the driving force of the existing thickness reduction rolling roller mechanism,
This driving force and the roller non-driving or reverse torque driving of the continuous casting material bending machine 8 are provided in cooperation with each other, and existing equipment can be used as a tension applying mechanism, so that the equipment can be rationalized. be able to.

FIG. 4 shows another embodiment of the present invention. In the figure, the same reference numerals as those used in the first embodiment denote the same parts. In the present embodiment, the width rolling method of the present invention is applied to a rolling system in which the continuous casting process of the thin plate continuous cast material 7 and the width rolling and the thickness reducing rolling processes are performed separately. That is, in this rolling system, the continuous casting material 7 produced by the tundish 1 and the continuous casting machine 2 is bent by the bending rollers 40, 41, 42 to produce a coil 43, and the coil 43 is rewound on the rolling mechanism side. Rolling is performed after rewinding by the machine 44. Since the continuous cast material 7 that has been rewound has a winding curl, the continuous casting material 7 is wound by the roller 45 and two pairs of pinch rollers 46, 47 and 4.
After re-bending at 8,49, the width rolling roller mechanism in the next process 17
The width reduction and the thickness reduction rolling are performed by the thickness reduction rolling roller mechanism 27. Reference numerals 50 and 51 are cylinders for pressing down the pinch rollers 47 and 49.

In this embodiment, however, the pinch rollers 46 and 48 that fix the winding of the continuous cast material 7 are not driven (motor 16 is stopped).
Or by applying a torque in the opposite direction to the traveling direction of the continuous cast material 7 by the motor 16 as necessary, the non-driving or reverse torque and the driving force of the reduced thickness rolling roller mechanism 27 are made to cooperate with each other. Thus, the continuous casting material 7 in the width rolling step can be given sufficient tension to perform the width rolling process. Therefore, also in this embodiment, the same effect as that of the above-described first embodiment can be obtained.

In the first and second embodiments described above, the pinch rollers 10, 11 and 12, 13 for bending the continuous casting material or the pinch rollers 46, 47, 48 for re-bending the continuous casting material are used. Although 49 is also used as a roller mechanism for tension application, instead of this, a dedicated roller mechanism for tension application is used for the pinch rollers 10-1.
The same effect can be obtained by separately providing the width rolling roller mechanism 17 instead of 3,46 to 49.

〔The invention's effect〕

As described above, according to the present invention, in width rolling processing of a continuous cast material, by applying effective tension in addition to the width rolling force to the continuous cast material, even if the continuous cast material is thinned, its width rolling is performed. The existing pinch roller mechanism and reduced-thickness rolling roller mechanism used for rolling equipment are used to prevent the occurrence of buckling, which is sometimes a problem, and without using a special tension applying mechanism to prevent this buckling. Since it can be used, it can contribute to rationalization of rolling equipment.

[Brief description of drawings]

FIG. 1 is a system diagram of a first embodiment in which the width rolling method according to the present invention is applied to a system for continuously performing a continuous casting process and a rolling process, and FIG. 2 is a width rolling roller mechanism used in the above embodiment. FIG. 3 is a sectional side view of FIG. 3, FIG. 3 is a partially omitted sectional plan view of the width rolling roller mechanism, and FIG. 4 is a system diagram of a second embodiment in which the width rolling method of the present invention is applied to another rolling system. Is. DESCRIPTION OF SYMBOLS 1 ... Tandishyu, 2 ... Continuous casting machine, 7 ... Continuous casting material, 10, 11, 12, 13 ... Tensioning roller mechanism (also used as a bending roller), 16 ... Tensioning roller drive motor, 17 ... Rolling roller mechanism , 18… width rolling roller, 27… thickness rolling roller mechanism, 32… thickness rolling roller drive motor, 46,47,48,49
… Tensioning roller mechanism (also used as re-bending roller).

Claims (1)

[Claims] 1. A continuous casting material produced in a thin plate shape by a continuous casting machine is fed to a width rolling roller mechanism before being subjected to thickness reduction rolling by a thickness reduction rolling roller mechanism, and the continuous casting material is fed by the width rolling roller mechanism. In the method of performing width rolling of continuous cast material by applying rolling force from both sides in the width direction to the width center, the continuous casting process, width rolling and thickness reduction rolling process are systematized in series and drooped from the continuous casting machine. The continuous casting material sent out in the horizontal direction is bent horizontally by the pinch roller of the bending mechanism provided in the preceding stage of the width rolling roller mechanism and guided to the width rolling roller mechanism, or the continuous casting process and width rolling and thickness reduction. A system for performing the rolling process separately from the rolling process, in which the continuous casting material once wound is guided to the width rolling roller mechanism through a pinch roller of the continuous casting material rebending mechanism. Tension is applied to the continuous cast material passing through the width rolling roller mechanism by driving the reduced thickness rolling roller mechanism with the motor for driving the pinch roller of the rebending mechanism stopped or in reverse rotation. A method for width-rolling a continuous cast material, which is characterized in that: