KR101300236B1 - Metal plate rolling machine and rolling method - Google Patents

Abstract

An object of this invention is to provide the rolling mill which can take the opening degree between top and bottom work rolls largely, and can provide responsive and strong roll bending force.
MEANS TO SOLVE THE PROBLEM In order to solve a subject, the rolling mill which this invention provides is a rolling mill of a metal plate which has a pair of upper and lower work rolls, and a pair of upper and lower reinforcement rolls which support them, respectively, and apply the incending bending force to each of the upper and lower work rolls. A loading hydraulic cylinder is disposed in the project block projecting into the rolling mill housing, and the rolling direction force loaded on the lower work roll body portion is supported by the contact surface between the project block and the lower work roll choke, and the upper work roll body The rolling direction load applied to the part is supported by the contact surface between the rolling mill housing window located above the project block and the upper work roll choke.

Description

Metal plate rolling mill and rolling method {METAL PLATE ROLLING MACHINE AND ROLLING METHOD}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rolling mill of a metal sheet having a high responsiveness and capable of imparting a strong roll bending force. In particular, it is related with the rolling mill which can take the largest opening degree between upper and lower work rolls suitable for the rough rolling mill of a thick plate rolling mill, or thin plate hot rolling, and can give strong roll bending force.

Moreover, this invention relates to the rolling method using the said rolling mill which can provide a highly responsive and powerful plate crown shape control function.

In the rolling operation of a metal plate material, the crown and shape of a rolled plate become an important quality index, and the technique regarding plate crown shape control is disclosed a lot.

However, for example, in the rolling mill which manufactures a thick plate product by multipass reverse rolling, such as a thick-plate rolling mill or the roughing mill of thin-plate hot rolling, the clearance gap (roll opening degree) between upper and lower work rolls is more than the sheet thickness of a rolling material. It is necessary to take large. For this reason, the plate crown shape control apparatus imposes restrictions on the rolling mill equipment design.

For example, Patent Literature 1 discloses a roll bending force that is controlled on the basis of rolling performance values in all passes using a work roll bending device as a shape control device in a thick plate rolling rolling in a predetermined thickness in a plurality of passes. A rolling method is described.

The rolling mill format disclosed in patent document 1 is a four-stage rolling mill, and the rolling mill format is a structure shown in FIG. The deless bending device placed in the rolling mill of FIG. 14 becomes the rolling mill shown in FIG. The two mills are basically the same structure. That is, it is a type which the arm part connected to the upper reinforcement roll choke 4-1 hold | maintains the upper work roll choke 3-1. Incident bending apparatuses 6-1 and 6-2 of the upper work roll 1-1 enter this arm part. By setting it as such a form, a large roll opening degree can be taken.

In the rolling mill of FIGS. 10 and 14, the incending bending devices 6-3, 6-4 of the lower work roll 1-2 are enclosed in a project block connected to the rolling mill housing 9. In addition, as the rolling mill type which can take a large roll opening degree, as shown in FIG. 11, the reinforcement roll chocks 4-1 and 4-2 hold | maintain the work roll chocks 3-1 and 3-2 both up and down. There is also a rolling mill.

In addition, an incending bending apparatus means the hydraulic apparatus which applies the force of the direction which enlarges roll opening degree to a work roll choke. An incline bending apparatus is a generic term of the apparatus containing the hydraulic cylinder which is the actuator. In the present invention, however, for the sake of simplicity, the incline bending device shall refer to a hydraulic cylinder that is an actuator unless otherwise specified. The force applied to the work roll by the in-less bending device is called an in-less bending force.

On the other hand, the hydraulic apparatus which applies the force of the direction which makes a roll opening degree small to a work roll choke is called a decris bending device, and the force which loads (adds) to a work roll by this is called a decris bending force. In addition, a declining bending apparatus is a general term of the apparatus containing the hydraulic cylinder which is the actuator. In the present invention, however, for the sake of simplicity, the deless bending device shall refer to a hydraulic cylinder that is the actuator, unless otherwise specified.

As shown in FIG. 12, the patent document 2 discloses the rolling machines in which the incending bending apparatus 6-1, 6-2 of a work roll enters the work roll chocks 3-1, 3-2. .

Patent document 3 discloses the rolling machine of a roll cross system. Also in this rolling mill, as shown in FIG. 12, the incending bending apparatus 6-1, 6-2 enters the work roll chocks 3-1, 3-2.

Patent Document 4 discloses a rolling mill having a work roll shift function as shown in FIG. 13. This rolling mill enters the project blocks 5-1 and 5-2 in which the incending bending devices 6-1 and 6-2 are integrated with the rolling mill housing. In addition, in the rolling mill disclosed in Patent Document 4, a plurality of hydraulic cylinders of the incending bending device are arranged in the roll axial direction, so that an unloading load is not applied during the work roll shift.

Moreover, generally, the rolling mill of a thick steel plate does not have a decris bending machine as shown in FIG. 14 (refer patent document 1, 2, 3, 4).

However, the rolling mill according to the present invention is based on the premise of having a deless bending device in order to give a powerful plate crown shape control function. Therefore, FIG. 10, FIG. 11, FIG. 12, and FIG. 13 show the case where it has a decris bending apparatus.

Patent Document 1: Japanese Unexamined Patent Publication No. Hei 6-87011 Patent Document 2: Japanese Laid-Open Patent Publication No. 62-220205 Patent Document 3: Japanese Unexamined Patent Publication No. Hei 6-198307 Patent Document 4: Japanese Unexamined Patent Publication No. 4-52014

Typical thick plate rolling mills (rolling mills shown in FIGS. 10 and 11), as disclosed in Patent Document 1, are designed with the highest priority as to which roll opening degree can be largely taken. That is, the arm part connected to the upper reinforcement roll choke 4-1 in which the up-down position is set and controlled by the pushing device 11 is structured to hold the upper work roll choke 3-1. In addition, since the incending bending apparatuses 6-1 and 6-2 are placed in this arm portion having a structural limitation, it is difficult to put a large-capacity hydraulic cylinder. For this reason, a strong roll bending force cannot be given.

For example, a work roll bending device having a capability of exceeding 200 tf / chock has been put into practical use even in a hot strip mill finishing mill having a work roll diameter of about 800 mm. On the other hand, only the work roll bending apparatus of about 200 tf / chock is put into practical use also in the heavy-plate rolling mill of the work roll diameter of about 1000 mm. In contrast to roll diameters, it is clear that a larger amount of roll bending force is required.

At this time, the bending of the roll which is an index of the roll bending effect is inversely proportional to the cross-sectional secondary moment of the roll if the bending moments loaded are the same. Therefore, the roll bending effect of the thick plate rolling mill with the work roll diameter of 1000 mm is about 60% lower than that of the hot strip mill finishing mill with the work roll diameter of 800 mm.

For this reason, as a plate crown shape control apparatus of a thick plate rolling mill, a roll cross function and a roll shift function are utilized and it is mainly utilized. A work roll bending device is rarely used.

However, the roll cross function and the roll shift function are difficult to change settings quickly during rolling. Therefore, since it is impossible to eliminate the disturbance factor during rolling, it cannot be said that it is incomplete as a shape control stage.

On the other hand, when the incending bending apparatuses 6-1 and 6-2 enter the work roll chocks 3-1 and 3-2, as in the rolling mills (FIG. 12) disclosed by patent document 2 and 3, The stroke of the cylinder can be lengthened. Thereby, large roll opening degree can be implement | achieved. In addition, since a large-capacity hydraulic cylinder can be put, a practical work roll bending effect can be expected even in a thick plate rolling mill.

On the other hand, since work rolls 1-1 and 1-2 are easier to wear than reinforcement rolls by rolling operation, regular roll replacement is necessary. For this reason, the hydraulic piping of the incending bending device must be attached and detached every time the replacement work is performed. For this reason, not only does a roll replacement time become long, but also the possibility that a micro foreign material mixes in a hydraulic pipe at the time of piping desorption becomes high.

For this reason, in this rolling mill, the servo valve for high responsive hydraulic control cannot be employ | adopted. In addition, in order to facilitate the attachment and detachment of the pipe, it is necessary to be connected to the respective hydraulic control valve through a flexible structure and a detachable hydraulic pipe (flexible pipe, etc.). By adopting flexible piping, however, the flexible structure also absorbs and mitigates the fluctuations in hydraulic pressure. Therefore, it becomes difficult to set it as the roll bending apparatus with high responsiveness.

On the other hand, the rolling mills disclosed in Patent Documents 2 and 4 (FIG. 13) are project blocks 5-1 and 5-2 in which the incending bending devices 6-1 and 6-2 are connected to the rolling mill housing 9. Is in. For this reason, it is not necessary to attach or detach the hydraulic piping of an incending bending apparatus for every roll replacement operation. Therefore, this rolling mill can be set as the roll bending apparatus with high responsiveness. For this reason, it is used a lot in the hot strip mill finishing rolling mill.

However, it is the contact surface of the work roll choke 3-1 and the project block 5-2 that this rolling mill supports rolling direction forces, such as the offset component force which acts on the upper work roll 1-1. For this reason, when the roll opening degree is enlarged by operating the pushing device 11, the rotation center of a work roll will become outward of this contact surface, and the posture of the work roll choke 3-1 will become unstable. As a result, a large roll opening degree cannot be taken. For this reason, this rolling mill � €€ is rarely employed in a thick plate rolling mill which requires a large roll opening degree.

As mentioned above, in the rolling mill which can take large roll opening degree, the rolling mill which can insert a highly responsive and powerful work roll bending apparatus does not exist in the prior art. The problem to be solved of this invention is providing the rolling mill which can take the opening degree between upper and lower work rolls, and can give a high responsive and strong roll bending force.

MEANS TO SOLVE THE PROBLEM In order to solve the said subject, as a result of earnestly examining, as a result, the project block which protruded in the inner direction from the housing is shifted downward with respect to a pass line, and installed so that it may be made up-down asymmetric with respect to a pass line. Turned out to be possible.

(a) A structure in which the rolling direction force applied to the upper work roll choke is always received by the housing. Thereby, a work roll choke can be stably supported regardless of roll opening degree.

(b) In the project block, the upper and lower incidence bending device can be put. Thereby, the powerful bending apparatus of a large capacity and a large stroke can be provided.

(c) In addition, by inserting the incending bending device into the project block, it is possible to fix the hydraulic pipe and to apply the servovalve. This makes it possible to control the inductive bending force with high response.

In addition, it was found that the invention on the apparatus enables the following rolling mill operation method.

(d) Even in the case of a low responsive bending device, the high responsive bending force control can be performed by operating together with the fast responding in-less bending device. As a result, product quality and rolling yield are greatly improved.

This invention is made | formed based on such knowledge, The summary is as follows.

(1) A rolling mill of a metal sheet having a pair of upper and lower work rolls and a pair of upper and lower reinforcement rolls respectively supporting them, wherein a hydraulic cylinder for applying an incending bending force to the upper and lower work rolls protrudes inwardly of the rolling mill housing. The rolling direction force is disposed in the project block, the rolling direction force added to the lower work roll body part is supported by the contact surface of the project block and the lower work roll choke, and the rolling direction force added to the upper work roll body part is the project block. The rolling mill of the metal sheet characterized by being supported by the contact surface of the rolling mill housing window located above and the upper work roll choke.

As described above, the incline bending device is a generic term for a device including a hydraulic cylinder that is an actuator thereof. In the present invention, however, for the sake of simplicity, the incline bending device shall refer to a hydraulic cylinder that is an actuator unless otherwise specified.

(2) A hydraulic cylinder for applying an inks bending force to the upper work roll and a hydraulic cylinder for applying an inks bending force to the lower work roll are arranged in different positions on the plan view in the project block. The rolling mill of the metal plate of 1).

(3) The rolling machine of the metal plate as described in (1) or (2) characterized by the above-mentioned reinforcing roll choke being provided with the hydraulic cylinder which adds a declining bending force to an upper work roll.

In the present invention, like the incending bending device, the deless bending device is a generic term for a device including a hydraulic cylinder that is an actuator thereof. In the present invention, however, for the sake of simplicity, the deless bending device shall refer to a hydraulic cylinder that is the actuator, unless otherwise specified.

 (4) a second project block (for example, 5-3, 5-4 in FIG. 4) in which a hydraulic cylinder for applying deless bending force to the lower work roll is located below the lower reinforcement roll choke or the project block. It is arrange | positioned at the rolling mill of the metal plate as described in any one of (1)-(3).

(5) As a rolling method of a metal plate material performed using the rolling machine of the metal plate material as described in said (3),

Prior to the start of rolling, both of the in-bending bending force and the de-less bending force are applied, and the working roll bending force corresponding to the roll balance force as the combined force is applied to the working roll choke.

Thereafter, while changing the de-cursing bending force to become the de-cursing bending force during the predetermined rolling, the in-cursing bending force is changed so that the sum of the de-cursing bending force and the in-less bending force maintains the roll balance force. This step is to make the de-cursing bending force into the de-cursing bending force during the predetermined rolling from the beginning, and let the in-cursing bending force act on the work roll choke so that the combined force of the de-cursing bending force and the in-less bending force becomes the roll balance force. , Can be omitted.

Subsequently, at the start of rolling, the increse bending force is changed while continuing the control of maintaining the deciphering bending force to the decris bending force during the predetermined rolling, and the work roll bending force during the rolling as the combined force is the work roll choke. It is in a state to act on.

During rolling, rolling is carried out to maintain the work roll bending force during the predetermined rolling,

Thereafter, at the end of rolling, the incending bending force is changed, and the work roll bending force corresponding to the roll balance force is acted on the work roll choke as a joint force with the decris bending force, thereby rolling the metal sheet in this state. Quit.

Then, the deless bending force and the increse bending force are reduced to maintain the roll balance force as the force. This step also maintains the de-cursing bending force during the predetermined rolling while the de-cursing bending force is applied to the work roll choke so that the combined force of the de-cursing bending force and the in-cursion bending force becomes the roll balance force. If yes, it can be omitted.

It is a rolling method of the metal plate material characterized by the above.

(6) The hydraulic pressure in the hydraulic cylinder generating the de-cursing bending force or the hydraulic pressure in the hydraulic pipe connected to the hydraulic cylinder is measured, and a roll bending force acting on the work roll choke as a force based on the measured value is a predetermined value. The method of rolling the metal sheet as described in (5), wherein the inless bending force is controlled so as to be obtained.

As shown in FIG. 1, the rolling mill according to the present invention uses the rolling direction force applied to the body portion of the upper work roll 1-1 to the upper work roll choke 3-1 and the project block 5-2. The structure is supported by the contact surface with the housing window above. Therefore, a large roll opening degree can be taken and a powerful roll bending force can also be obtained.

In addition, it is not necessary to attach or detach the hydraulic piping of the in-less bending device every time the work roll is replaced. For this reason, each hydraulic control valve can be connected to an incending bending device through a fixed hydraulic piping, and the servo valve for high responsive hydraulic control can be employ | adopted, and it can be set as a highly responsive incending bending device. .

In the rolling method according to the present invention, even when a de-responsive de-cursive bending device is indispensable, a responsive in-cursive bending device compensates for this and gives a highly responsive and powerful plate crown / shape control function. can do.

Therefore, it is possible to make a favorable plate crown shape also with respect to the disturbance which fluctuates during rolling, such as rolling material side plate thickness and rolling material temperature, and can improve product quality and a yield significantly.

1 is a side view showing an example of the structure of a rolling mill according to the present invention.
Fig. 2 is a perspective plan view showing an arrangement example of the up and down incidence bending device.
Fig. 3 is a perspective plan view showing an arrangement example of the up and down incidence bending device.
It is a side view which shows another example of the structure of the rolling mill which concerns on this invention.
It is a figure which shows an example of the operation flow of the rolling method which concerns on this invention.
It is a figure which shows time-series changes, such as roll bending force, with the operation flow of FIG.
FIG. 7 is a diagram showing time-series changes such as roll bending force in the case where the response of the decris bending device is low. FIG.
It is a figure which shows another example of the operation flow of the rolling method which concerns on this invention.
9 is a view showing a time series change such as a roll bending force according to the operation flow of FIG. 8.
It is a side view which shows the structure of the rolling mill which concerns on a prior art.
It is a side view which shows the structure of the rolling mill which concerns on a prior art.
It is a side view which shows the structure of the rolling mill which concerns on a prior art.
It is a side view which shows the structure of the rolling mill which concerns on a prior art.
It is a side view which shows the structure of the rolling mill which concerns on a prior art.

Hereinafter, with reference to FIGS. 1-13, the rolling mill concerning this invention and the rolling method using this rolling mill are demonstrated.

1 is a side view showing an example of the structure of a rolling mill according to the present invention. As shown in FIG. 1, the rolling mill which concerns on this invention is a pair of upper and lower work rolls 1-1 and 1-2, and a pair of upper and lower reinforcement rolls 2-1 and 2-2 which support them, respectively. It is a rolling mill provided with.

Moreover, the rolling mill which concerns on this invention inks to the upper incending bending apparatus 6-1, 6-2 which loads an inks bending force on the upper work roll 1-1, and the lower work roll 1-2. It is the rolling mill which arrange | positioned the lower incense bending apparatus 6-3, 6-4 which loads a lease bending force in the project block 5-1, 5-2 which protruded inwardly of the housing 9. As shown in FIG.

On this point, it is similar to the conventional rolling mill shown in FIG. However, the rolling mill which concerns on this invention fundamentally reviewed, and solved the problem of the conventional rolling mill shown in FIG. That is, the position of the project blocks 5-1 and 5-2, the shape of the upper work roll choke 3-1, etc. were changed from the viewpoint of the structural design of a rolling mill, especially the point which takes the roll opening degree large.

In the conventional rolling mill shown in FIG. 13, a big roll opening degree cannot be taken. This rolling mill arrange | positions the project blocks 5-1 and 5-2 so that it may become substantially up-down symmetric with respect to the position (pass line) which the to-be-rolled material 10 passes. This is due to the contact surface where the upper work roll choke 3-1 and the project block 5-2 come into contact with each other, so that the rolling direction force such as an offset component acting on the upper work roll 1-1, that is, the rolled material 10 It is because it is a structure which supports the rolling direction force loaded to the trunk | drum of the upper work roll 1-1 from the upper reinforcement roll 2-1, etc.).

In this structure, as the roll opening degree is increased, the rotational center position (working point of the rolling directional force) of the upper work roll 1-1 and the upper work roll choke 3-1 move upwards, thereby increasing the rolling direction force. The contact area with the supporting project block 5-2 is reduced. Therefore, when roll opening degree is enlarged, the attitude | position of the upper work roll choke 3-1 will become unstable and a large roll opening degree cannot be taken.

The rolling mill according to the present invention solves the above problem. As shown in FIG. 1, the rolling mill which concerns on this invention arrange | positions the project block 5-1, 5-2 which protruded in the inward direction from the housing 9 in the position shifted downward with respect to a pass line. . That is, unlike the conventional rolling mill shown in FIG. 13, the project blocks 5-1 and 5-2 are arrange | positioned so that it may become vertically asymmetric with respect to a pass line. In addition, the upper work roll choke 3-1 was not in contact with the project block 5-2 to support the rolling force, but in contact with the housing window to support the rolling force.

Thereby, in the rolling mill which concerns on this invention, it acts on the upper work roll 1-1 by the contact surface of the upper work roll choke 3-1 and the housing window 12 upper than the project block 5-2. Rolling direction forces, such as an offset component, ie, the rolling direction force loaded on the trunk | drum of the upper work roll 1-1 from the to-be-rolled material 10, the upper reinforcement roll 2-1, etc. are supported.

With such a structure, even if the roll opening degree is increased by operating the rolling device 11 of the rolling mill, the area where the upper work roll choke 3-1 and the housing window contact each other does not change at all. Therefore, the posture of the upper work roll choke 3-1 is always kept stable regardless of the roll opening degree.

As shown in FIG. 13, the rolling mill which arrange | positioned the upper and lower incense bending apparatuses to the project block is well known. However, the rolling mill according to the present invention performs a fundamental review of the positions of the project blocks 5-1 and 5-2 and the shape of the upper work roll choke 3-1, so that the upper work roll 1-1 Since the rolling direction force applied to the body part is supported by the contact surface between the upper work roll choke 3-1 and the housing window 12 above the project block 5-2, a large roll opening degree can be taken. have.

Moreover, in the rolling mill which concerns on this invention, it inclines to the upper incending bending apparatuses 6-1 and 6-2 and the lower working roll 1-2 which load the incending bending force on the upper work roll 1-1. The lower inks bending devices 6-3 and 6-4, which load the bending force, were placed in the project blocks 5-1 and 5-2 protruding inwardly of the housing 9. Therefore, it is not necessary to attach or detach the hydraulic pipe of an incending bending apparatus every time the work roll is replaced, and it can be set as a highly responsive incending bending apparatus. This is because each of the hydraulic control valves can be connected to each other via a fixed hydraulic pipe, and a servo valve for high-response hydraulic control can be employed.

Moreover, in the rolling mill which concerns on this invention, the rolling direction force loaded on the trunk | drum of the lower work roll 1-2 is based on the contact surface of the lower work roll choke 3-2 and the project block 5-2. Receive support. For this reason, the rolling mill which concerns on this invention shown in FIG. 1 makes the height of the part fitted into the project blocks 5-1 and 5-2 of the lower work roll choke 3-2 large.

In addition, since the roll opening degree is mainly adjusted by moving the upper work roll choke up and down, the amount of vertical movement of the lower work roll choke is small. Therefore, as the roll opening degree increases, the posture of the lower work roll does not become unstable.

Fig. 2 is a sectional plan view showing an arrangement example of the up and down incidence bending device. That is, it is sectional drawing of the pass line height of the project blocks 5-1 and 5-2.

In the rolling mill which concerns on this invention, it is good to arrange | position the top and bottom incense bending apparatus mutually on the cross-sectional plan view of a project block. For example, as shown in FIG. 2, the upper incending bending apparatus 6-1, 6-2 and the lower incending bending apparatus 6-3, 6-4 are made into the work roll 1-2. It is good to arrange so that it may become a positional relationship shifted to the axial direction of (). In this way, the upper and lower incidence bending devices do not interfere with each other. The stroke of the upper incending bending apparatuses 6-1 and 6-2 is enlarged, and a larger roll opening degree can be taken.

In addition, in FIG. 2, the lower incending bending apparatuses 6-3 and 6-4 used two hydraulic cylinders, respectively. However, the same effect can also be obtained by using one hydraulic cylinder and arranging it at different positions in the axial direction of the work roll 1-2 without interfering with the upper incline bending apparatuses 6-1, 6-2.

Fig. 3 is a sectional plan view showing an arrangement example of the up and down incidence bending device. That is, it is sectional drawing of the pass line height of the project blocks 5-1 and 5-2. As shown in FIG. 3, you may make it the positional relationship which shifted the upper incending bending apparatus 6-1, 6-2 and the lower incending bending apparatus 6-3, 6-4 in the rolling direction. . In this arrangement, the upper and lower incline bending devices do not interfere with each other. The stroke of the upper incending bending apparatuses 6-1, 6-2 can be made large, and a larger roll opening degree can be taken.

The structure of the rolling mill which concerns on this invention was demonstrated so far from the viewpoint of obtaining the big roll opening degree which is one of the subjects which were solved. Next, according to this structure, it demonstrates that the provision of the strong roll bending force which is another solution can also be achieved easily.

10 and 11 are both rolling mills according to the prior art, and both rolling mills can take large roll openings.

However, in these conventional rolling mills, a strong roll bending force cannot be given. Since it is a structure which fits the upper incending bending apparatuses 6-1 and 6-2 into the arm part which protrudes downwardly from the upper reinforcement roll choke 4-1, the upper inks bending apparatus of large capacity and a large stroke ( This is because 6-1 and 6-2) cannot be disposed. In addition, since these rolling mills extend the arm from the upper reinforcement roll choke, the installation space of the upper de-cursion bending device closely adheres to the axis of the roll. Therefore, since it interferes with the bearing of an upper reinforcement roll, it is because a large capacity upper deless bending apparatus 7-1, 7-2 cannot be arrange | positioned.

On the other hand, as shown in FIG. 1, in the rolling mill which concerns on this invention, the upper incending bending of a large capacity and a large stroke is carried out to the project blocks 5-1 and 5-2 which protruded in the inward direction from the housing 9 of the rolling mill. The devices 6-1 and 6-2 can be arranged.

In addition, the rolling mill which concerns on this invention does not have the arm part like the rolling mill shown to FIG. 10, FIG. 11 in the upper reinforcement roll choke 4-1. For this reason, large-capacity upper declining bending apparatuses 7-1 and 7-2 can be arrange | positioned in the position which does not interfere with the bearing of the upper reinforcement roll of the upper reinforcement roll choke 4-1. Thereby, it becomes possible to load a large decrement bending force on the upper work roll 1-1.

That is, a fundamental review of the position of the project blocks 5-1 and 5-2 and the shape of the upper work roll choke 3-1 is carried out, and the rolling is applied to the body portion of the upper work roll 1-1. According to the rolling mill according to the present invention having a structure in which the directional force is supported by the contact surface between the upper work roll choke 3-1 and the housing window 12, a large roll opening degree can be taken, and a strong roll bending force can also be obtained. You can give it.

In addition, it is not necessary to attach or detach the hydraulic piping of the in-less bending device every time the work roll is replaced. For this reason, each incending bending apparatus 6-1 to 6-4 can be connected to each hydraulic control valve through a fixed hydraulic piping, and the servo valve for hydraulic control of high responsiveness can be employ | adopted. Therefore, it can be set as the inductive bending apparatus with high responsiveness.

It is a side view which shows another example of the rolling mill which concerns on this invention. In the rolling mill shown in FIG. 4, the upper roll system is the same as that of FIG. 1, but the lower roll system is another structure. The rolling mill shown in FIG. 1 arrange | positioned the lower declining bending apparatuses 7-3 and 7-4 which load the decritic bending force on the lower work roll to the lower reinforcement roll chocks 4-2. On the other hand, the rolling mill shown in FIG. 4 has dedicated lower projecting bending apparatuses 7-3, 7-4, and dedicated project blocks 5-3, located below project blocks 5-1, 5-2. 5-4).

By the way, when the lower declining bending apparatuses 7-3 and 7-4 are arranged on the lower reinforcement roll chocks 4-2 as in the rolling mill shown in Fig. 1, when the lower reinforcement rolls 2-2 are replaced, In addition, the hydraulic piping of the de-crystal bending device must be removed. That is, there is a high possibility that minute foreign matters are mixed in the hydraulic pipe during detachment.

For this reason, in general, since it is difficult to employ a servo valve for high-response hydraulic control, it is sometimes necessary to employ some flexible piping.

Therefore, compared with the case where fixed pipe | tube or a servo valve is employ | adopted, the responsiveness of a roll bending apparatus will inevitably become low.

On the other hand, according to the rolling mill shown in FIG. 4, the said problem which arises when replacing the lower reinforcement roll 2-2 can be solved. This is because a servo valve for high-response hydraulic control can be employed in the hydraulic pipe of the lower de-cursing bending device placed in the dedicated project block, and the flexible pipe does not need to be used. For this reason, replacement of the lower reinforcement roll 2-2 becomes easy, and it can be set as the roll bending apparatus with high responsiveness.

Next, the rolling method concerning this invention is demonstrated. As shown in FIG. 1, FIG. 4, when the upper declining bending apparatus 7-1, 7-2 is arrange | positioned to the upper reinforcement roll choke 4-1, the upper reinforcement roll 2-1 is replaced. In this case, the hydraulic pipe of the de-cursing bending device should be attached and detached, and when detached, there is a high possibility that minute foreign matters are mixed in the hydraulic pipe.

For this reason, it is generally relatively difficult to employ a servovalve for high-response hydraulic control. In addition, in order to facilitate the attachment and detachment of the pipe, it is necessary to connect to the respective hydraulic control valve through a flexible structure and detachable hydraulic piping, such as flexible piping. In the case of adopting a flexible structure such as a flexible pipe and freely attaching or detaching a hydraulic pipe, the flexible structure may be absorbed or mitigated due to the flexible structure.

Therefore, in the case where the upper declining bending apparatuses 7-1 and 7-2 are arranged on the upper reinforcement roll choke 4-1, compared with the case where the fixed piping or the servovalve is adopted, Responsiveness must be lowered.

By the way, the decris bending force cannot be loaded when the rolling load is not loaded. Therefore, in the case of applying the decris bending bending force, it is necessary to quickly set the decris bending bending force from the roll balance idle state to the start of rolling, and to quickly return to the roll balance state at the end of rolling.

Therefore, if the change of the roll bending force is changed while controlling the de-less bending device which is less responsive, there is a possibility that the predetermined defective portion is not loaded at the stern end of the rolled material and the shape defective portion is long. have.

The rolling method concerning this invention solves the said subject. That is, the rolling method using the rolling mill which concerns on this invention which arrange | positioned the upper declining bending apparatus 7-1, 7-2 to the upper reinforcement roll choke 4-1, solves the said subject which may arise with the said rolling mill. It is a rolling method.

As mentioned above, in the rolling machine which arrange | positioned the upper declining bending apparatuses 7-1 and 7-2 to the upper reinforcement roll choke 4-1, the responsiveness of a deless bending apparatus may worsen.

However, in the rolling mill according to the present invention, a structure in which the upper incline bending devices 6-1 and 6-2 are arranged in the project blocks 5-1 and 5-2 protruding inward from the housing 9 is provided. For this reason, it can be set as the large-capacity, large stroke upper part incending bending apparatus 6-1, 6-2.

In addition, since it is not necessary to remove the hydraulic pipe of the incending bending device every time the roll replacement work is carried out, a fixed hydraulic pipe or a servovalve can be employed, whereby an inductive bending device with high responsiveness can be obtained.

The rolling method according to the present invention is an inductive bending apparatus having a high responsiveness when changing the roll bending force at the start of rolling and at the end of rolling when the defrost bending force is applied to the work roll for the purpose of plate crown shape control. It is carried out using, to compensate for the responsiveness of the decris bending device.

It is a figure which shows an example of the operation flow of the rolling method which concerns on this invention. That is, it is a figure which shows the operation flow of the responsive bending machine which is highly responsive, and the declining bending device which is slightly responsive compared with this.

6, time-series changes, such as the roll bending force with respect to one rolling material, in this rolling method are shown. FIG. 6 shows the time series change of the rolling load, the output of the incending bending apparatus, the output of the deciphering bending apparatus, and the work roll bending force that is their combined force from above. Hereinafter, it demonstrates based on FIG. 5, 6.

First, before starting rolling, the set value F _R of the rolling work roll bending force corresponding to the rolling material to be rolled next is computed and output. In this case, it is assumed that F _R is calculated with a negative value, that is, a declining bending force. In the present invention, the positive bending force (force in the inks direction (roll opening direction)) is a positive (+) value, and the decris bending force (the force in the declining direction (direction of pressing the upper and lower work rolls)) is determined. Set to a negative value.

Before rolling commences, both the in- bending bending force and the de-curling bending force are acted on, so that the roll bending force on the incres side corresponding to the roll balance force F _B acts on the work roll choke as a combined force.

In other words, during idle before rolling, the in-bending bending device output is set to I _B (> 0) and the de-less bending device output is set to D _B (<0), and I _B + D _B is the roll balance force F _B (> 0). Works.

The roll balance force F _B is determined as a force that the reinforcement roll following the work roll driven by the electric motor does not slip even in an idle state. At this time, D _B may be set to a minimum hydraulic pressure such that the actuator of the decris bending device does not fall off from the work roll choke.

Also, at some timing (a point on the time axis) before the start of rolling, the predetermined de-curing bending device output D _S sufficient to apply the working roll bending force F _R during rolling is set to D _S = F. Calculated by _R -I _R. And D _S and I _S are output simultaneously, so that roll balance force F _B may become constant. At this time, I _R is haedunda predetermined values close to Inc. less bending machine outputs, and the minimum value possible so that the absolute value of the control D _S is not excessive in the rolling. I _S is an in-less bending device output such that I _S + D _S = F _B. Therefore, at the set timing, the work roll bending force as the force does not change substantially with F _B.

Next, at the start of rolling, while maintaining the constant value, the decris bending force lowers the incritical bending force and causes the work roll bending force F _R during the predetermined rolling to act on the work roll choke as a force.

That is, at the start of rolling (point b on the time axis), the incending bending device output is changed from I _S to I _R. In this way, the slow response deless bending device output remains D _S , and the work roll bending force as a force is controlled from the roll balance force F _B (> 0) by the control of the fast responseless bending device. It can be switched quickly to the bending force F _R (<0).

In addition, at the start of rolling (b), it refers to the time of starting rolling, and the detection is made when the load detected by the load cell for rolling load measurement of a rolling mill exceeds 30% of the predicted rolling load, for example. It is good to set it as.

In addition, in order to return the roll bending force to the state before rolling commencement at the end of rolling, the roll bending force corresponding to the roll balance force F _B is acted on the work roll choke as a combined force, and rolling is complete | finished.

In other words, at the end of rolling (point c on the time axis), the de-cursion bending device output changes the fast in-cursion bending device output of the response from I _R to I _S while remaining D _S. By doing in this way, the work roll bending force as a combined force can be quickly switched from the work roll bending force F _R (<0) to roll balance force F _B (> 0) during rolling.

In addition, at the time of completion | finish of rolling (c), it points out the end of rolling, and the detection is made into the timing in which the load detected by the load cell for rolling load measurement of a rolling mill is less than 50% of the average rolling load average value, for example. It is good to set it as.

Further, from the end of rolling (c), for example, a time point in which 1 to 3 seconds have elapsed is set as the work completion timing (d point on the time axis), and at this timing, the in-less bending device output is I _B , and the de-less bending Change the device output to D _B. Even in this change, the work roll bending force as the force is almost maintained by the roll balance force F _B.

5 and 6, in the rolling method according to the present invention, the change in the roll bending force at the start of rolling and at the end of rolling is performed using an inductive bending device with high responsiveness. For this reason, even when a relatively responsive decris bending device is required to be arranged, the responsive and inductive bending device compensates for this, so that a highly responsive and powerful plate crown shape control function can be provided. .

In addition, even when the rolling load changes due to various factors (disturbance) during rolling, it is possible to quickly control the inductive bending machine with a high response so as to maintain an optimum work roll bending force. In this case, what is necessary is just to control to change the work roll bending force during rolling according to the measured value of rolling load, for example.

That is, according to the rolling method which concerns on this invention, it is possible to make favorable plate crown shape also about the disturbance which fluctuates during rolling, such as rolling material side plate thickness and rolling material temperature. This can greatly improve product quality and yield.

FIG. 7 is a view showing a time series change such as a roll bending force in the case where the responsiveness of the decris bending device is low (particularly, when the reaction force is released, the pressure decreases). Similarly to FIG. 6, time series changes such as roll bending force due to rolling operations for one rolled material are shown in accordance with the operation flow of the in-less bending device and the de-less bending device shown in FIG. 5. That is, the example of the case where the response speed of the de-critical bending apparatus is slow compared with the case of FIG. 5, 6 is shown.

In the case of Fig. 7, the output of the inductive bending apparatus with high responsiveness changes rapidly at timings b and c, so that the output of the declining bending apparatus with poor responsiveness fluctuates. As a result, the work roll bending force as the combined force is late in reaching F _R at timing b, and late in reaching F _B at timing c. The rolling method shown in FIG. 8 solves this problem.

FIG. 8 is a view showing an operation flow in the case of having a highly responsive incresing bending device and a low responsive decrement bending device. Hereinafter, it demonstrates based on FIG.

In the rolling method shown in FIG. 8, the deless bending force or the hydraulic pressure in the hydraulic piping connected to the said apparatus is always measured by the load cell installed in the decritical bending apparatus, and an incending bending apparatus is controlled based on this measured value. do. That is, before and after rolling, the output of the in-less bending device or the hydraulic pressure of the de-less bending device is adjusted so that the working roll bending force becomes the roll balance force F _B and the rolling roll bending force becomes F _R during rolling. To control accordingly. In addition, control other than this is the same as the rolling method shown in FIG.

By rolling by the rolling method shown in FIG. 8, as shown in FIG. 9, an in-less bending device compensates for the fluctuation of the output of a deless bending device, and can realize the control of a high responsiveness of an operation roll bending force optimally. have.

In addition, even if feedback control by the measurement or dehydration of the de-cursion bending force during rolling is not performed, the same can be achieved by predicting the fluctuation of the output of the de-cursion bending apparatus in advance and setting the output of the in-cursion bending apparatus to compensate for it. The effect can be obtained.

Industrial availability

Industrial Applicability The present invention can be used for rolling steel sheets, in particular for reverse rolling mills requiring a large opening degree.

1-1 Upper Work Roll
1-2 lower work roll
2-1 Upper Reinforcement Roll
2-2 Lower Reinforcement Roll
3-1 Upper Work Roll Choke
3-2 Lower Work Roll Choke
4-1 Upper Reinforcement Roll Choke
4-2 Lower Reinforcement Roll Choke
5-1 Entry Project Block
5-2 Exiting Project Block
5-3 Entry Subproject Block
5-4 Exiting Subproject Block
6-1 Entry-Top Incry Bending Device
6-2 Outlet upper bending machine
6-3 Entry-side lower incidence bending device
6-4 Outlet lower incidence bending device
7-1 Entry-side Decris Bending Device
7-2 Outgoing Upper DeCris Bending Device
7-3 Entrance De-Crystal Bending Device
7-4 Exit De-Cris Bending Device
8-1 Entry Reinforcement Roll Balancing Device
8-2 Exit reinforcement roll balance device
9 housing
10 Rolled Material
11 rolling device
12 housing windows

Claims (7)

As a rolling mill of a metal plate which has a top and bottom pair of work rolls, and a top and bottom pair of reinforcement rolls which support them, respectively,
Hydraulic cylinders for respectively applying an incursion bending force to the upper and lower work rolls are disposed in the project block projecting into the rolling mill housing,
The rolling direction force applied to the lower work roll body portion is supported by the contact surface between the project block and the lower work roll choke,
And a rolling direction force applied to the upper work roll body portion is supported by a contact surface between the rolling mill housing window located above the project block and the upper work roll choke. 2. The hydraulic cylinder of claim 1, wherein the hydraulic cylinder that adds an incline bending force to the upper work roll and the hydraulic cylinder that applies an incline bending force to the lower work roll are disposed at different positions in a plan view in the project block. Rolling mill of metal plate, characterized in that. The metal sheet rolling mill according to claim 1 or 2, wherein a hydraulic cylinder for applying a deless bending force to the upper work roll is disposed on an upper reinforcement roll choke of the upper reinforcement roll. The hydraulic cylinder according to claim 1 or 2, wherein a hydraulic cylinder for applying a deless bending force to the lower work roll is disposed in a lower reinforcement roll choke of the lower reinforcement roll or a second project block installed below the project block. The rolling mill of metal plate material which is characterized by the above-mentioned. As a rolling method of a metal plate material using the rolling machine of the metal plate material of Claim 3,
Before both rolling start, both of the in-kold bending force and the de-chry bending force are applied, and the work roll bending force corresponding to the roll balance force as the force is applied to the work roll choke,
Thereafter, the in- bending bending force is changed while maintaining control of maintaining the de-cursing bending force at the de-cursing bending force during the rolling at the start of rolling, and the work-roll bending force during the rolling is determined as the work force. I make a state to work on a chalk,
During rolling, rolling is performed to maintain the work roll bending force during the predetermined rolling,
Subsequently, at the end of rolling, the in bending bending force is changed, and the work roll bending force corresponding to the roll balance force is acted on the work roll choke as a force with the decris bending force, thereby rolling the metal sheet in this state. It finishes, The rolling method of the metal plate material characterized by the above-mentioned. 6. The roll bending force according to claim 5, wherein the hydraulic pressure in the hydraulic cylinder generating the de-cursing bending force or the hydraulic pressure in the hydraulic pipe connected to the hydraulic cylinder is measured, and acts on the work roll choke as a combined force based on the measured value. The said sheetless bending force is controlled so that it may become this predetermined value, The rolling method of the metal plate material characterized by the above-mentioned. 4. A hydraulic cylinder for applying a deless bending force to the lower work roll is disposed in a lower reinforcement roll choke of the lower reinforcement roll or a second project block installed below the project block. Rolling mill of sheet metal.

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