JPH08197110A - Rolling mill - Google Patents

Abstract

PURPOSE: To provide a rolling mill whose crossing state is stably held by simple structure and with which the generation of vibration is prevented. CONSTITUTION: In the offset state where the cross point Oc of upper and lower work rolls 21, 22 which are made to be in the slightly crossed state is shifted by (e) in the feeding direction of rolling, the work rolls are brought into contact with upper and lower back-up rolls 23, 24. Pressing force is caused to act between the work roll 21 (22) and the back-up roll 23 (24) by utilizing the horizontal component PF of force by rolling force P which is produced with this offset amount (e). In this way, by stably holding the crossing state and preventing the vibration, special mechanisms are unnecessitated and the structure is simplified.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a rolling mill that rolls by crossing upper and lower work rolls, and has a simple structure in which the cross point of the work rolls is offset with respect to the axis of the reinforcing rolls in a stable crossing state. Is designed to be able to hold.

[0002]

2. Description of the Related Art There is a strict demand for the thickness accuracy of rolled products in the plate width direction, and one of the rolling mills that can meet this requirement is a cross roll rolling mill that slightly rolls work rolls.

In the cross roll rolling mills that have been put into practical use so far, one set of the upper work roll and the upper reinforcement roll, and one set of the lower work roll and the lower reinforcement roll are provided for each of the upper and lower sets. A method of crossing the rolls in pairs is adopted.

However, in the pair cross type cross roll rolling machine, in addition to the upper and lower work rolls, a cross mechanism is required for the upper and lower reinforcing rolls, so that the structure becomes complicated and there is a problem such as a deviation from the rolling screw for applying rolling load. In order to solve such a problem, there has been proposed a work roll cross rolling machine that rolls by rolling only work rolls.

For example, in a rolling mill for crossing only work rolls disclosed in Japanese Patent Laid-Open No. 5-50110,
As shown in FIG. 7A, a hydraulic jack 7 is provided on the project block 6 of the housing 5 corresponding to the roll chocks 3, 4 of the upper and lower work rolls 1, 2, and the hydraulic jack 7 is driven to roll the chocks 3, 4. Is slid to make the work rolls 1 and 2 in a crossed state.

In the crossed state of the work rolls 1 and 2, as shown in a plane state in FIG. 7B, the center (mill center) O in the width direction of the axis Lb of the backup rolls 8 and 9 is the crossing center Oc. Upper and lower work rolls 1, 2
Are crossed on a horizontal plane (the same plane as the rolling feed direction).

In this cross roll rolling machine, a lubricating oil supply device 14 and a scraper 15 are provided so that the thrust force generated along with the roll cloth can be reduced to put the work roll cross rolling machine into practical use.

[0008]

In such a work roll cross rolling mill, the upper work roll 1 is inclined in a state of being in contact with one point on the line connecting the lowest points (apex) of the outer circumference of the upper backup roll 8. And the lower work roll 2
Is in a state of being in contact with one point on the line connecting the uppermost points (apex) of the outer periphery of the lower backup roll 9, and the horizontal force applied to the work rolls 1 and 2 becomes unstable. As a result, the cross point Oc is easily displaced, which makes it difficult to maintain the cross state or causes vibration.

Therefore, a hydraulic jack 13 is connected to one side of the roll chocks 10 and 11 of the backup rolls 8 and 9 in the rolling feed direction via a push plate 12 to apply a pressing force between the roll chocks 10 and 11 and the housing 5. I try to make it work and not move.

Therefore, there is a problem that the structure of the cross roll rolling machine itself becomes complicated.

The present invention has been made in view of the above problems of the prior art, and an object thereof is to provide a rolling mill capable of stably maintaining a cross state with a simple structure and preventing the occurrence of vibration. To do.

[0012]

In order to solve the above problems, a rolling mill according to claim 1 of the present invention is a cross roll rolling in which the upper and lower work rolls are slightly crossed while the upper and lower reinforcing rolls are in a parallel state. In the machine, the cross points of the upper and lower work rolls are arranged offset with respect to the roll axis of the upper and lower reinforcing rolls either before or after the rolling feed direction.

According to a second aspect of the present invention, in addition to the configuration of the first aspect, a rolling position detecting means for detecting the positions of the upper and lower work rolls and detection from these roll position detecting means. Calculation control means for calculating an offset amount due to the work roll cross based on the signal and a roll gap correction amount for correcting a change in the roll gap based on this offset amount, and outputting this correction amount;
It is characterized by comprising a roll gap adjusting mechanism for adjusting the roll gap according to the roll gap correction amount.

[0014]

According to the rolling mill of the first aspect of the present invention, the cross points of the upper and lower work rolls, which are slightly crossed, are shifted in the rolling feed direction and offset so as to be in contact with the upper and lower reinforcing rolls. The pressing force acts between the work roll and the reinforcing roll by using the horizontal component force due to the rolling force generated by this offset, thereby maintaining a stable cross state and preventing vibration. , The special mechanism is not required and the structure is simplified.

Further, according to the rolling mill of the second aspect of the present invention, when the cross point of the work roll is offset in the rolling feed direction so as to contact the reinforcing roll, the roll gap changes according to the offset amount. Therefore, this offset amount is detected by the roll position detecting means, the correction amount of the roll gap based on this offset amount is calculated and output by the arithmetic control means, and the roll gap is corrected by the roll gap adjusting mechanism in the rolling direction. In this way, the rolling mill can be operated in the same manner as in the past, without fluctuation of the roll gap.

[0016]

Embodiments of the present invention will be described in detail below with reference to the drawings. 1 to 5 relate to an embodiment of a rolling mill of the present invention, FIG. 1 is an explanatory view of an offset state of a work roll and a reinforcing roll and an action state of a horizontal component force, and FIG. 2 is a cross mechanism of an offset state. Horizontal sectional view, FIG. 3 is an overall schematic sectional view applied to a four-high rolling mill, FIG. 4 is a horizontal sectional view on a work roll, FIG. 5 is a sectional view of a roll chock and a thrust force supporting mechanism, and a side view of the roll chock. is there.

This rolling mill 20 has upper and lower work rolls 2
1 and 22 and upper and lower backup rolls 23 and 24, and is composed of a four-high rolling mill.
This is a work roll cross mill in which only 1 and 22 are slightly crossed, and the crossing point Oc is offset by an offset amount e in the rolling feed direction with respect to the axis Lb of the backup rolls 23 and 24.

A cross mechanism 25 for setting such a cross point Oc of the work rolls 21 and 22 in an offset state with respect to the axis Lb of the backup rolls 23 and 24.
In this rolling mill 20, the work rolls 21, 2 are
Roll chock (axle box) 26, 26a, 2 at both ends of 2
Of the 7, 27a, only one roll chock 26, 27a in the opposite direction is swiveled so as to cross. As shown in FIG. 2B, when the upper and lower work rolls 21, 22 are crossed, Work roll 21,
When 22 is in a parallel state and the cross angle is 0 (the axis Lb of the parallel upper and lower backup rolls 23 and 24 coincides with the axis), the point eccentric by the eccentric amount e from the center (mill center O) is cross. It will be the center Oc.

One such roll chock 26, 2
Cross mechanism 25 for crossing with only 7a as the turning center
Will be specifically described in the case of the upper work roll 21.

In the cross mechanism 25 of the upper work roll 21, as shown in FIG.
Only one roll chock 26 of 6, 26a is used as the center of rotation, and the side faces of the roll chock 26 in the front and rear directions in the line direction are constituted by convex partial cylindrical surfaces 28, respectively. A pair of blocks 30 are arranged, and a concave partial cylindrical surface 31 having substantially the same curvature as the partial cylindrical surface 28 is formed at the tip of the pair of blocks 30.

Therefore, the convex partial cylindrical surface 28 of the roll chock 26 is supported by the concave partial cylindrical surface 31 of the block 30 installed in the housing 29 before and after the rolling direction, and the center OL of the roll chock 26 is supported. The upper work roll 21 can be tilted as the turning center.

Thus, the center O of the upper roll chock 26 is
Since the upper work roll 21 is crossed with L as the turning center, the other roll chock 26a is formed with convex partial cylindrical surfaces 32 on the front and rear side surfaces in the rolling direction, for example, as shown in FIG. 2 (a). On the other hand, a pair of blocks 33 is arranged before and after the housing 29 in the rolling direction, and is mounted so that each block 33 can move in the rolling direction before and after along a guide 34 attached to the housing 29. A flat surface 35 that abuts the partial cylindrical surface 32 is formed. Further, an actuator 37 is attached to the housing 29 as a movement adjusting mechanism 36 for moving the blocks 33 before and after the rolling direction,
A block 33 is connected to the tip of an actuator connecting shaft 37a of each actuator 37.

Therefore, when the actuator connecting shaft 37a of the actuator 37 of the movement adjusting mechanism 36 is expanded and contracted to move the block 33 back and forth in the rolling direction, the block 33 is moved.
One roll chock 26a of the work roll 21 is moved through the flat surface 35 of the roll chock 26a.
Of the work roll 21 at the center OL of the other roll chock 26, and the upper work roll 21 is tilted on the same horizontal plane as the rolling feed direction.

Similarly, the lower work roll 22 is rotatably supported by the partial cylindrical surface of the roll chock 27a and the partial cylindrical surface of the block so as to rotate around the center OR of the roll chock 27a opposite to the upper work roll 21.
An actuator is connected to a block that supports the other roll chock 27 so that the block can be tilted so as to move.

By doing so, the upper and lower work rolls 21,
22 four roll chocks 26, 26a, 27, 27
One of the roll chocks 26, 27 that is different from a
Actuator 3 that constitutes the movement adjustment mechanism 36 only in a
The upper and lower work rolls 21, with a simple structure that only requires 7,
It is possible to realize 22 roll cross states.

Further, at the time of work roll crossing, the roll chocks 26, 27a having the turning centers OL, OR and the other roll chock 26a provided with the movement adjusting mechanism 36,
27 are provided with convex partial cylindrical surfaces 28 and 32, respectively, and a concave partial cylindrical surface 31 is formed on one of the blocks 30 contacting the convex cylindrical surfaces 28 and 32, and a flat surface 35 is formed on the other block 33.
Is formed, the roll cloth can be smoothly moved, and the work rolls 21 and 22 can be smoothly moved in the direction of the rolling force.

In this rolling mill 20, the upper and lower work rolls 21 and 22 are cross-rolled in this way, but since thrust force is generated with the rolling, it is necessary to support this, and the thrust force support mechanism 40 is used. It is provided.

The thrust force support mechanism 40 is provided in one of the roll chocks 26, 27a which is the center of rotation during roll crossing of the upper and lower work rolls 21, 22, but here, the roll chock 26 of the upper work roll 21 is provided.
For example, as shown in FIGS. 4 and 5, for example, a flange-shaped thrust collar 41 is formed at the end of the work roll 21, and the roll chock 26 is formed on the front and rear surfaces thereof.
The roller-type thrust bearing 42 supported by the above is mounted so as to come into contact and roll, and supports the thrust force applied to the work roll 21.

In this thrust force support mechanism 40, the thrust force is transmitted from the thrust bearing 42 to the roll chock 26, and is transmitted to the block 30 via the partial cylindrical surface 28 of the roll chock 26 and the partial cylindrical surface 31 of the block 30. 30 is transmitted to the housing 29 in which it is installed and finally supported.

Both ends of the work roll 21 are rotatably supported by radial bearings 43 mounted in the roll chocks 26 and 26a, respectively, so that the work roll 21 can rotate smoothly.

When the work rolls 21 and 22 are crossed, one of the roll chocks 26 and 27a is used as the center of rotation, so that the supporting positions of the other roll chocks 26a and 27 must be changed. It is possible to cope by making it slide between the partial cylindrical surface 32 and the flat surface 35 between the roll chocks 26a, 27 and the block 33, or by ensuring a clearance that can be slid in the radial bearing 43. it can. (In an actual rolling mill, since the cross angle is small and the roll length is long, the movement amount of the work roll in the axial direction is extremely small.) The rolling mill 20 provided with the thrust force support mechanism 40 as described above
Then, the roll chock 26, 2 which is the center of rotation of the roll
The thrust collar formed in 7a and the thrust bearing can support the thrust force generated along with the roll cloth, and a large arm or the like on the outside of the roll chock 26, 27a for mechanically supporting the thrust force. The structure is simple without providing the support mechanism described in 1 above, and the thrust force can be supported more reliably and mechanically than in the case of reducing the thrust force by supplying the lubricating oil.

In this rolling mill 20, it is possible to further facilitate the exchange of the upper and lower work rolls 21 and 22 and to change the offset amount e of the cross center Oc of the upper and lower work rolls 21 and 22 to diversify the rolling conditions. In order to deal with this, the movement adjusting mechanism 45 is also provided on the roll chocks 26, 27a which are the turning centers of the roll cross.

In this movement adjusting mechanism 45, for example, as shown in FIGS. 2 to 4, actuators 46 for moving the blocks 30 before and after the rolling direction are attached to the housing 29, and the actuator connecting shafts 46a of the respective actuators 46 are mounted. A block 30 is connected to the tip of the block.

Therefore, the actuator connecting shaft 46a of the actuator 46 of the movement adjusting mechanism 45 is expanded and contracted to move the block 30 back and forth in the rolling direction, and at the same time, the actuator connecting shaft 37 of the movement adjusting mechanism 36 for roll crossing.
a is the movement amount for the roll cloth, and the movement adjustment mechanism 45
The work roll 21 can be moved in the rolling feed direction while being inclined by applying the same amount of movement as that of the work roll 21 and the offset amount e can be changed.

By using the movement adjusting mechanism 45, the actuator connecting shaft 46a of the actuator 46 is expanded and contracted to move the block 30 forward and backward in the rolling direction, so that the work roll is transferred through the concave partial cylindrical surface 31 of the block 30. 21 Partial cylindrical surface 2 of the roll chock 26
It is also possible to press 8 and cause the work roll 21 to turn by the movement of the roll chock 26 so that the cross center Oc of the upper and lower work rolls 21 and 22 coincides with the mill center O.

Further, the actuator connecting shaft 46a is retracted so that the pair of blocks 30 sandwiching the roll chock 26 in the front and rear of the rolling direction are retracted, and the roll chock 26 is positioned more than the tip of the convex partial cylindrical surface 28 of the roll chock 26.
When both ends of the concave partial cylindrical surface 31 of the pair of blocks 30 are retracted, the work rolls 21 and 22 can be easily taken out together with the roll chock 26 from the housing 29, and the rolls can be easily exchanged.

Further, in this rolling mill 20, not only can the upper and lower work rolls 21 and 22 be crossed to perform rolling, but also roll bending can be performed. For example, at one end of the upper work roll 21, As shown in FIGS. 4 and 5, the roll chock 26 has a fluid pressure cylinder 50 for roll bending arranged vertically between the roll chock 26 and the block 30. The work roll 26 can be bent.

Further, in this rolling mill 20, the turning center OL when the upper and lower work rolls 21 and 22 are crossed,
A flat surface 35 is formed on the block 33 on the side where the movement adjusting mechanism 36 opposite to the one roll chock 26, 27a to be OR is provided to support the convex partial cylindrical surfaces 28, 32 of the roll chock 26a, 27. Instead of this, as shown in FIG. 4, a concave curved surface 55 is also formed at the tip of the block 33 that moves due to the roll cloth, so that the work rolls 21 and 22 in the roll axial direction along with the roll cloth are formed. In consideration of the displacement, the curved surface 55 is formed so as to be a gentle curved surface larger than the curvature of the convex partial cylindrical surface 26 of the roll chocks 26a, 27 and have a contact area larger than that in the case of line contact.

Further, in actual rolling, since the cross angle of the roll cloth is small, the curved surface 55 formed at the tip of the block 33 has substantially the same curvature as that of the convex partial cylindrical surface 26 of the roll chocks 26a, 27. Is formed on the concave cylindrical surface of the work rolls so that almost all of them can be supported in a surface contact state, and the axial movement of the work rolls 21 and 22 due to the roll cloth is caused by the clearance of the inner race of the radial bearing of the work rolls 21 and 22. It is also possible to secure the roll cross, and at the same time, the roll cross can be smoothly performed, and at the same time, the contact area can be increased to support the roll chocks 26a and 27 and maintain the roll cross state.

In the rolling mill 20 thus constructed, work roll cross rolling is carried out as follows.

Cross center Oc of the work rolls 21 and 22
And the mill center O are eccentric to perform work roll cross rolling by crossing only the opposite one of the upper and lower work rolls 21 and 22 as the turning centers OL and OR. By moving the other roll chocks 26a, 27 of 22 opposite to each other by the movement adjusting mechanism 36, the cross angle is set, and at the same time, the movement adjusting mechanism 36 and the movement adjusting mechanism 45 are operated at the same amount at the same time to adjust the eccentricity e. Set to a given value.

As a result, as shown in FIG. 2B, the upper and lower work rolls 21 and 22 are crossed at a position where the cross center Oc of the upper and lower work rolls 21 and 22 deviates from the mill center O by an eccentric amount e, and the rolls of the rolling mill 20 roll. In the horizontal sectional state, as shown in FIG. 1B, the cross center Oc of the upper and lower work rolls 21 and 22.
Corresponds to the mill center O in the rolling width direction.

In this way, the upper and lower work rolls 21 and 2 are
2 and the backup roll 23,2
When rolling in a state of being offset from the axis Lb of 4 in the rolling feed direction, as shown in FIGS. 1 (c) and 1 (d), for example, between the upper work roll 21 and the upper backup roll 23, the rolling force is increased. A horizontal component force PF is generated with respect to P along with the offset amount e, which causes the upper work roll 21
Will be pressed against the upper backup roll 23. Then, the reaction force of this horizontal component force PF acts as the horizontal reaction force of the backup roll.

Therefore, the upper and lower backup rolls 2
It is possible to stably maintain the crossed state of the upper and lower work rolls 21 and 22 without pressing the roll chocks 3 and 24 against the housing 25 with a pressing hydraulic cylinder or the like, and to prevent the occurrence of vibration. You can

Next, such upper and lower work rolls 21,
When the work roll cross rolling is performed with 22 being offset by the offset amount e in the rolling feed direction with respect to the axis Lb of the backup rolls 23 and 24, if the offset amount e is changed, the roll between the upper and lower work rolls 21 and 22 is changed. The gap will also change.

Therefore, the work roll cross rolling is performed by correcting the roll gap.

First, in order to obtain the relationship between the offset angle Θ and the roll gap change ΔS, as shown in FIG. 6A, the radius of the work roll is r, the radius of the backup roll is R, and the offset angle Θ = When the half of the roll gap at 0 is A and the half of the roll gap at offset angle Θ is B, the relationship between the offset angle Θ and the roll gap change ΔS can be expressed by the following equation.

ΔS = 2 · (A + B) = 2 · {(R + r)
(1-cos Θ)} Therefore, if the offset angle Θ is known, the roll gap change ΔS can be calculated. Therefore, FIG.
As shown in (b), the work roll chocks 26, 27
The moving amount sensor 61 as the roll position detecting means 60 is provided to detect the moving amount of the rolling feed direction of the sheet, and the detection signals from these moving amount sensors 61 are sent to the calculation control means 62 to calculate the offset amount e. Along with the offset angle Θ
From the relationship of sin Θ = e / (R + r), the change ΔS of the roll gap is calculated from the above equation, and this value ΔS
Is output as a correction amount.

On the other hand, a housing 29 is provided on the rolling mill 20 side.
A roll gap adjusting actuator 63 is provided at the bottom of the roller so that the roll gap can be changed by moving the lower backup roll 24 and the lower work roll 22 by its expansion and contraction. It is adapted to detect and feed back to the arithmetic control means 62.

Further, the roll gap adjusting actuator 6
Hydraulic oil is supplied to and discharged from the hydraulic pump 65 via the servo valve 66.

Then, the servo valve 66 is connected to the arithmetic control means 62.
Is electrically connected, and feedback control is performed so as to supply or discharge the hydraulic oil to the roll gap adjusting actuator 63 according to the correction amount ΔS so that the roll gap does not change even if the offset amount e changes. There is.

Therefore, even if the roll gap 2A when the offset angle Θ = 0 is set in advance and the offset amount e is changed, the roll gap is controlled so as to be 2A, which is not the normal value. The rolling operation can be performed in the same manner.

The rolling mill 20 can perform work roll cross rolling in combination with work roll bending. In this case, the rolls provided between the blocks 30 and 33 and the roll chocks 26, 26a, 27 and 27a. Work roll bending can be performed by supplying a working fluid (for example, working oil) to the fluid pressure cylinder 50 for bending to expand and contract the rod. By combining with a work roll cloth, the control of the plate thickness distribution can be further widened. You will be able to.

The thrust force associated with such work roll cloth is supported as follows.

That is, when the work rolls 21 and 22 are crossed and rolled, a thrust force is generated in the roll axial direction, and a mechanism for supporting the thrust force is required.
At 0, the roll chock 26, 27a serving as the thrust force support mechanism 40 becomes the turning centers OL, OR of the roll cloth.
Since the thrust force can be supported by the housing 29 via the block 30 by providing the thrust bearing 42 therein and supporting the thrust collar 41 formed at the end of the roll,
Its structure is simple and rolls can be easily replaced.

Further, the convex partial cylindrical surface 32 is formed also on the roll chocks 26a and 27 on the side opposite to the roll chock which is the center of rotation of the roll cloth, and the concave partial cylindrical surface and the curved surface 55 are formed on the block 33 side. By doing so, the cross state of the upper and lower work rolls 21 and 22 can be stably held, and the displacement in the roll axial direction due to the roll cross can be absorbed by the curved surface 55 and the clearance of the inner race of the radial bearing 43. You can

[0057]

As described above in detail with reference to the embodiments, according to the rolling mill of the first aspect of the present invention, the cross points of the upper and lower work rolls that are slightly crossed are in the rolling feed direction. Since it is made to contact with the upper and lower reinforcing rolls in a state of being offset by shifting, the pressing force acts between the work roll and the reinforcing roll by utilizing the horizontal component force due to the rolling force generated with this offset. Thus, it is possible to maintain a stable crossed state and prevent vibration, and it is possible to simplify the structure without requiring a special mechanism.

Further, according to the rolling mill of the second aspect of the present invention, when the cross point of the work roll is offset in the rolling feed direction so as to contact the reinforcing roll, the roll gap changes according to the offset amount. Therefore, this offset amount is detected by the roll position detecting means, the correction amount of the roll gap based on this offset amount is calculated and output by the arithmetic control means, and the roll gap is corrected by the roll gap adjusting mechanism in the rolling direction. Since this is done, it is possible to carry out the rolling operation by the cross roll rolling machine in the same manner as in the past, while preventing the fluctuation of the roll gap.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of an offset state of a work roll and a reinforcing roll and an action state of a horizontal component force according to an embodiment of a rolling mill of the present invention.

FIG. 2 is a horizontal sectional view of a cross mechanism in an offset state according to an embodiment of the rolling mill of the present invention.

FIG. 3 is an overall schematic cross-sectional view applied to a four-high rolling mill according to an embodiment of the rolling mill of the present invention.

FIG. 4 is a horizontal sectional view on a work roll according to an embodiment of the rolling mill of the present invention.

FIG. 5 is a sectional view of a roll chock and a thrust force support mechanism and a side view of the roll chock according to an embodiment of a rolling mill of the present invention.

FIG. 6 is an explanatory view of a relationship between an offset angle Θ and a roll gap change ΔS and an explanatory view of a roll gap adjusting mechanism according to another embodiment of the rolling mill of the present invention.

FIG. 7 is a cross-sectional view of a conventional rolling mill and a plan view of a work roll in a crossed state.

[Explanation of symbols]

 20 rolling mill 21 upper work roll 22 lower work roll 23 upper backup roll 24 lower backup roll 25 cross mechanism 26 roll chock 26a that is the turning center 26a roll chock 27 that is the moving side roll chock 27a that is the moving center roll chock 28 is a convex partial cylinder Surface 29 Housing 30 Block (Swivel Center Side) 31 Concave Partial Cylindrical Surface 32 Convex Partial Cylindrical Surface (Movement Side) 33 Block (Movement Side) 34 Guide 35 Flat Surface (Movement Side) 36 Movement Adjustment Mechanism (Movement Side) 37 Actuator 37a Actuator Connecting Shaft 40 Thrust Force Support Mechanism 41 Thrust Collar 42 Thrust Bearing 43 Radial Bearing 45 Movement Adjusting Mechanism (Swing Center Side) 46 Actuator 46a Actuator Connecting Shaft 50 Fluid Cylinder 55) Curved surface (moving side) 60 Roll position detection means 61 Movement amount sensor (rolling feed direction) 62 Calculation control means 63 Roll gap adjusting actuator 64 Vertical position sensor 65 Hydraulic pump 66 Servo valve e Eccentric amount Θ Offset angle ΔS Roll gap change O Mill center Ob Backup roll axis Oc Cross center OL Swing center (upper roll) OR Swing center (lower roll)

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location B21B 31/16 37/18 BBH B21C 51/00 N

Claims (2)

[Claims] 1. A rolling mill for rolling by rolling upper and lower work rolls while keeping the upper and lower reinforcing rolls in a parallel state,
A rolling mill in which the cross points of these upper and lower work rolls are arranged offset with respect to the roll axis of the upper and lower reinforcing rolls either in the front or rear of the rolling feed direction. 2. A roll position detecting means for detecting the positions of the upper and lower work rolls, and an offset amount due to a work roll cross based on detection signals from these roll position detecting means and a change in a roll gap based on this offset amount. 2. A roll gap adjusting mechanism for calculating a roll gap correction amount to be calculated and outputting the correction amount, and a roll gap adjusting mechanism for adjusting the roll gap according to the roll gap correction amount. Rolling mill.