JP7230628B2 - Rolling equipment and control method - Google Patents

Description

The present invention relates to a rolling mill and a control method in the rolling mill.

Conventionally, in the rolling process of metal materials such as steel, the tail end of the rolled material passes through the immediately preceding stand (the stand on the upstream side in the conveying direction of the rolled material), and the rolled material receives the load from the work rolls of each stand. When the tension caused by this is released, or after that time, the tail end of the rolled material may be shifted, rotated, tucked, twisted, etc. due to various factors. Such a phenomenon is conspicuous, for example, in thin materials with a thickness of 2.0 mm or less, or materials with a thickness of 3.0 mm or less, depending on the steel type, where the temperature is likely to drop during rolling and the rolling speed is high. had occurred in

When such a phenomenon occurs, the rolled material hits the side guides and sparks occur, the rolled material is rolled overlapping between the work rolls of the rolling mill, and the rolled material is rolled in a wrinkled or twisted state. These phenomena are also simply referred to as "throttling"). In order to solve such problems, conventionally, various methods of adjusting the left and right roll gaps (roll opening degrees) in the width direction between the work rolls (left and right leveling of the roll gap, left and right leveling of the roll gap) have been studied. .

For example, in the technique disclosed in Patent Document 1, the rolled material speed is detected by a plate speed detector at the entry side and the exit side of the rolling mill, and the difference in speed between the left and right sides in the width direction of the rolled material is obtained. The left and right roll openings of the rolling mill are adjusted based on the difference.

Further, in Patent Document 2, the difference between the forces in the rolling direction acting on the roll chocks between the working side and the driving side is calculated, and the roll opening of the rolling mill is adjusted so that the difference in the forces in the rolling direction becomes the control target value. A method for controlling the left-right asymmetric component of is disclosed.

In Patent Document 3, a rotation speed detection sensor for detecting the horizontal rotation speed of the steel plate is provided between a target stand where meandering control of the steel plate is performed and an upstream rolling stand, and the detected horizontal rotation speed of the steel plate is provided. is used to control meandering of the tail end of a steel plate.

Japanese Patent Application Laid-Open No. 60-227912 Japanese Patent Application Laid-Open No. 2006-110627 Japanese Patent Application Laid-Open No. 2018-15766

However, in the techniques of Patent Documents 1 to 3, since the rolled material speed at the entrance and exit sides of the rolling mill, the force acting on the rolls, the rotation speed of the steel plate, etc. are detected, There is a problem that it is not possible to respond immediately and responsiveness is poor. Further, with the technique disclosed in Patent Document 2, accurate data cannot be obtained even when there is backlash between the housing of the rolling mill and the roll chocks.

Thus, various methods for controlling the leveling of the left and right roll gaps of the work rolls have been studied, and various detection means such as load sensors, meandering sensors (lateral contact sensors), speed sensors, etc. are used. . However, none of them have exhibited satisfactory functions, and the above problems have not yet been solved.

SUMMARY OF THE INVENTION An object of the present invention, which has been made in view of such circumstances, is to provide a rolling apparatus and a control method capable of suppressing the reduction phenomenon at the tail end of a rolled material.

(1) A rolling mill according to an aspect of the present invention includes a pair of work rolls for rolling a material to be rolled, and a plurality of speed detectors provided on the entry side of the pair of work rolls, and detects speed. A device is provided within a range of 1.5 m from the center of a pair of work rolls, is located on the entry side of the work rolls, and has a pair of side guides for guiding the rolled material from the working side and the drive side of the work rolls. Further, the speed detector is provided on each side guide of the pair of side guides .
In the rolling mill having the above configuration, a plurality of speed detectors are provided on the entrance side of the pair of work rolls to be controlled and in the vicinity thereof, so that the rolling mill can be accurately and highly reproducibly detected. It is now possible to understand the effect of the difference in elongation (elongation strain) between the left and right sides of the rolled material in the width direction that occurs in the roll bite, and it is possible to adjust the roll gap to suppress the reduction phenomenon at the tail end of the rolled material. Become.

( 2 ) In the rolling mill described in ( 1 ) above, each side guide is movable in the width direction of the work roll, and the position of the speed detector provided in each side guide follows the movement of the side guide. good too.

( 3 ) The rolling mill described in ( 1 ) or ( 2 ) above may further include a speed detector for detecting the plate speed at the center position in the width direction of the rolled material.

( 4 ) The rolling mill according to any one of (1) to ( 3 ) above may further include speed setting means, and the speed setting means may preset the conveying speed of the rolled material.

( 5 ) A control method according to an aspect of the present invention is a control method for controlling a roll gap between a pair of work rolls for rolling a material to be rolled in a rolling mill. A detection step of detecting the strip speed of the rolled material passing through the pair of work rolls at a plurality of speed detection positions on the entry side of the pair of work rolls , and based on the strip speed, the rolled strip at the speed detection position and an adjustment step of adjusting the roll gap between the work rolls of the pair of work rolls based on the plate thickness, wherein the speed detection position is 1 from the center of the pair of work rolls .5 m, the rolling mill is located on the entry side of the work rolls and further comprises a pair of side guides for guiding the rolled material from the work side and drive side of the work rolls, and detecting the strip speed A speed detector is provided on each side guide of the pair of side guides .
In the control method having the above configuration, the plate speed of the rolled material is detected at a plurality of speed detection positions near the work rolls on the entrance side of the pair of work rolls to be controlled. With reproducibility, it became possible to grasp the influence of the difference in elongation rate (elongation strain) in the width direction of the rolled material occurring in the roll bite of the rolling mill, and to suppress the reduction phenomenon at the tail end of the rolled material. It is possible to adjust the roll gap.

( 6 ) In the control method described in ( 5 ) above, two speed detection positions may be provided on the working side and the driving side of the pair of work rolls.

( 7 ) In the control method described in ( 5 ) above, the speed detection positions may be provided at three positions, ie, the work side and drive side of the pair of work rolls and the center position of the rolled material.

( 8 ) In the control method according to any one of ( 5 ) to ( 7 ) above, in the calculation step, the speed The plate thickness of the rolled material at the detection position may be calculated.

( 9 ) A control method according to an aspect of the present invention is a control method for controlling a roll gap between a pair of work rolls for rolling a material to be rolled in a rolling mill. A detection step of detecting the plate speed of the rolled material passing through the pair of work rolls at two speed detection positions on the entry side of the pair of work rolls and on the work side and the drive side of the work rolls; a calculating step of calculating a speed difference between the working side and the driving side of the work rolls based on the speeds; and an adjusting step of adjusting a roll gap between the work rolls of the pair of work rolls based on the speed differences; Since the speed detection position is within a range of 1.5 m from the center of the pair of work rolls, the rolling mill is located on the entry side of the work rolls, and guides the rolled material from the work side and drive side of the work rolls. and a speed detector for detecting the plate speed is provided in each side guide of the pair of side guides.
In the control method having the above configuration, the plate speed of the rolled material is detected at a plurality of speed detection positions near the work rolls on the entrance side of the pair of work rolls to be controlled. With reproducibility, it became possible to grasp the influence of the difference in elongation rate between the left and right sides of the rolled material in the width direction that occurs in the roll bite of the rolling mill, and the roll gap adjustment to suppress the reduction phenomenon at the tail end of the rolled material became possible. It becomes possible.

( 10 ) A control method according to an aspect of the present invention is a control method for controlling a roll gap between a pair of work rolls for rolling a material to be rolled in a rolling mill. A detection step of detecting the plate speed of the rolled material passing through the pair of work rolls at two speed detection positions on the entry side of the pair of work rolls and on the work side and the drive side of the work rolls; Based on the set conveying speed and plate speed of the rolled material, a speed calculation step of calculating the representative speed on the work side and the drive side of the work roll, and based on the representative speed, on the work side and the drive side of the work roll A calculating step of calculating a virtual plate thickness at an arbitrary position of the rolled material, and an adjusting step of adjusting the roll gap between the work rolls of the pair of work rolls based on the virtual plate thickness, wherein the speed detection position is A pair of side guides located within 1.5 m from the center of a pair of work rolls, the rolling mill is located on the entry side of the work rolls, and guides the rolled material from the working side and the drive side of the work rolls. and a speed detector for detecting the plate speed is provided on each side guide of the pair of side guides .
In the control method having the above configuration, the plate speed of the rolled material is detected at a plurality of speed detection positions near the work rolls on the entrance side of the pair of work rolls to be controlled. With reproducibility, it became possible to grasp the influence of the difference in elongation rate between the left and right sides of the rolled material in the width direction that occurs in the roll bite of the rolling mill, and the roll gap adjustment to suppress the reduction phenomenon at the tail end of the rolled material became possible. It becomes possible.

( 11 ) A control method according to an aspect of the present invention is a control method for controlling a roll gap between a pair of work rolls for rolling a material to be rolled in a rolling mill. The plate speed of the strip passing through the pair of work rolls is measured at three speed detection positions: the entry side of the pair of work rolls, the work side and drive side of the work rolls, and the center position of the strip. A detection step of detecting, a speed calculation step of calculating a representative speed on the work side and the drive side of the work roll based on the strip speed, and a rolling material on the work side and the drive side of the work roll based on the representative speed and an adjustment step of adjusting the roll gap between the work rolls of the pair of work rolls based on the virtual plate thickness, wherein the speed detection position is the pair of work rolls within 1.5 m from the center of the rolling mill, the rolling mill further comprising a pair of side guides located on the entry side of the work rolls for guiding the rolled material from the working side and the drive side of the work rolls, A speed detector for detecting the plate speed is provided on each side guide of the pair of side guides .
In the control method having the above configuration, the plate speed of the rolled material is detected at a plurality of speed detection positions near the work rolls on the entrance side of the pair of work rolls to be controlled. With reproducibility, it became possible to grasp the influence of the difference in elongation rate between the left and right sides of the rolled material in the width direction that occurs in the roll bite of the rolling mill, and the roll gap adjustment to suppress the reduction phenomenon at the tail end of the rolled material became possible. It becomes possible.

ADVANTAGE OF THE INVENTION According to this invention, the rolling apparatus and control method which can suppress the reduction phenomenon of the tail end of a rolled material are provided.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic side view which shows typically an example of the rolling mill which concerns on 1st Embodiment of this invention. FIG. 2 is a schematic plan view when the rolling mill shown in FIG. 1 is viewed from above; FIG. 6 is a schematic plan view of a rolling mill according to a second embodiment of the present invention as viewed from above; BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic side view which shows a part of rolling equipment provided with the rolling mill which concerns on 1st Embodiment. It is a flow diagram for explaining a third embodiment of the present invention. It is a flow diagram for explaining a fourth embodiment of the present invention. It is a flow diagram for explaining a fifth embodiment of the present invention. It is a flow chart for explaining a sixth embodiment of the present invention. FIG. 12 is a flow diagram for explaining a seventh embodiment of the present invention;

Basically, the tail end reduction phenomenon occurs due to the difference in elongation strain in the width direction of the rolled material in the roll bite of the rolling mill. However, the inventors of the present invention have conducted image analysis of the phenomenon of constriction at the tail end, which is a problem, and have found that the direction of meandering or rotation of the rolled material does not necessarily coincide with the direction of elongation strain. Conventionally, when there is a difference in the amount of elongational strain in the width direction of the rolled material, it has been thought that the rolled material meanders from the side with large elongational strain to the side with small elongational strain on the plate surface of the rolled material.
However, in reality, when elongation and take-up occur in combination, the deformation behavior of the rolled material becomes complicated. It was found that a phenomenon occurs in which the rolled material meanders toward the side where the elongation strain is large. Therefore, when measuring the amount of meandering by the conventional meandering measurement position (meandering sensor installation position) or the rotational speed measurement position, there is a possibility that the opening and closing direction of the left and right roll gap adjustment of the work roll may be mistaken.

Based on the above knowledge, the present inventors have analyzed the video of the trouble due to the narrowing of the tail end, and found that the trouble occurred on the entry side of the rolling mill, that is, on the upstream side in the conveying direction of the rolled material. If the plate speed of the rolled material is measured at a position close to the rolling direction of the rolled material from the center of the roll, the influence of swelling and stickiness of the rolled material on the entry side of the rolling mill is reduced, and the left and right roll gaps can be adjusted correctly. I found

Embodiments of the present invention will be described below with reference to examples, but it is obvious that the present invention is not limited to the examples described below. In the following description, specific numerical values and materials may be exemplified, but other numerical values and materials may be applied as long as the effects of the present invention can be obtained.

In general, the side on which a roll driving motor is attached to the roll end of a rolling roll (work roll or backing roll) is called the "drive side", and the opposite side is called the "working side". We will use generic names.

[First embodiment]
FIG. 1 is a schematic side view schematically showing an example of a rolling mill according to this embodiment.
As shown in FIG. 1, a rolling mill 10 according to the present embodiment includes a pair of work rolls 11 for rolling a material W to be rolled, and a plurality of speed detectors 12 provided on the entry side of the pair of work rolls 11. , and a speed detector 12 is provided within a range of 1.5 m from the center C of the pair of work rolls 11 .

The pair of work rolls 11, as shown in FIG. 1, consists of an upper work roll 11a and a lower work roll 11b. As shown in FIG. 1, the upper work roll 11a and the lower work roll 11b are each supported by a backing roll 14. As shown in FIG. A backup roll is also called a backup roll.

A plurality of speed detectors 12 are provided on the inlet side of the pair of work rolls 11, that is, on the upstream side in the conveying direction R of the rolled material W. As shown in FIG. The speed detector 12 is provided within 1.5 m from the center C of the pair of work rolls 11 .
The center C of the pair of work rolls 11 is, in other words, the position through which the axis of the work rolls passes in a plane perpendicular to the axis of the upper work roll 11a or the lower work roll 11b (for example, the paper surface of FIG. 1). is. A plurality of speed detectors 12 are provided in a direction parallel to the rolling direction R of the rolled material W from the center C of the pair of work rolls 11 .

In the rolling mill 10 of the present embodiment, when controlling the leveling of the left and right roll gaps of the work rolls, a plurality of speed detectors are provided near the work rolls 11 on the entrance side of the pair of work rolls 11 to be controlled. 12 are provided.

The rolling mill 10 according to the present embodiment further includes a pair of side guides 13 located on the entry side of the work rolls 11 and for guiding the rolled material W from the work side WS and the drive side DS of the work rolls 11. A detector 12 may be provided on each side guide of the pair of side guides 13 .
With such a configuration, the speed detector 12 can accurately detect the plate speed at the ends of the rolled material W in the width direction.

FIG. 2 is a schematic plan view when the rolling mill 10 shown in FIG. 1 is viewed from above. As shown in FIG. 2, two speed detectors 12 are provided in the rolling mill 10 according to the present embodiment. 1 and 2, side guides 13 for guiding the rolled material W are further provided.

As shown in FIG. 2, the pair of side guides 13, for example, the side guide on the work side WS is called a work side side guide 13WS, and the side guide on the drive side DS is called a drive side side guide 13DS. Further, the speed detector 12 of the working side WS provided in the working side guide 13WS is referred to as speed detector 12WS, and the speed detector 12 of the driving side DS provided in the driving side guide 13DS is referred to as speed detector 12DS.

As shown in FIG. 2, the speed detector 12WS and the speed detector 12DS are located on the entry side of the work roll 11, and are positioned 1 .5m or less.
The speed detector 12 provided on the working side WS or driving side DS of the rolled material W may be provided in a range of 100 mm to 200 mm from the end of the rolled material W, respectively.

Although the speed detector 12 and the side guide 13 are depicted as separate members in the example of FIG. 1, the speed detector 12 and the side guide 13 may be connected by connecting means. In addition, the part of the side guide 13 positioned between the rolled material W and the speed detector 12 is partially cut so that the speed detector 12 can detect the plate speed in the vicinity of the widthwise end of the rolled material W. It may have notches or holes.

In the rolling mill 10 according to the present embodiment, each side guide 13 (working side side guide 13WS, driving side side guide 13DS) is movable in the width direction of the work roll 11, and each speed provided in each side guide 13 The position of the detector 12 (speed detector 12WS, speed detector 12DS) may follow the movement of each side guide 13 .

For example, in a 7-foot rolling mill, the width of the rolled material to be rolled is about 600 mm to 2000 mm. difference in mass flow) can be difficult to measure accurately. However, since the position of the speed detector 12 provided in the side guide 13 follows the movement of the side guide 13, it is possible to always detect the plate speed near the width direction end of the rolled material.

Moreover, the rolling mill 10 according to the present embodiment may further include speed setting means 15 (not shown). The conveying speed of the rolled material W may be set in advance by the speed setting means 15 .
In addition to the plate speed of the rolled material W detected by a plurality of speed detectors 12, by adjusting the roll gap of the work roll 11 based on the preset conveying speed of the rolled material W, the rolled material can be more efficiently The throttling phenomenon at the tail end of W can be suppressed.

In the rolling mill 10 according to the present embodiment, the plurality of speed detectors 12 are provided on the entry side of the pair of work rolls 11 to be controlled and in the vicinity thereof. In order to grasp the influence of the difference in elongation rate between the left and right in the width direction of the rolled material W occurring in the roll bite of the rolling mill 10 to be controlled, and to suppress the reduction phenomenon at the tail end of the rolled material W roll gap adjustment becomes possible.

[Second embodiment]
Next, a second embodiment of the invention will be described. FIG. 3 is a schematic plan view when the rolling mill 20 according to the second embodiment is viewed from above. FIG. 3 is a plan view similar to FIG. 2 of the first embodiment.
The rolling mill 20 according to the second embodiment basically has the same configuration as the rolling mill 10 according to the first embodiment, but the speed for detecting the strip speed at the center position in the width direction of the rolled material W is It differs from the rolling mill 10 of the first embodiment in that a detector 12C is further provided.

As shown in FIG. 3, the speed detector 12WS, the speed detector 12DS, and the speed detector 12C are positioned on the entry side of the work roll 11 and are located at the center of the work roll 11 (in FIG. 3, the axis of the upper work roll 11a). It is provided within 1.5 m from the center A).

In the present embodiment, the central position of the rolled material W in the width direction means that the rolled material W It means a range of 5% to 15% of the width of the rolled material W from the midpoint between the ends in the width direction toward both ends in the width direction of the rolled material W. Alternatively, the center position in the width direction of the rolled material W may be in the range of 180 mm to 220 mm around the midpoint between the ends of the rolled material W in the width direction.
Alternatively, the position of the speed detector 12C is the length of the line segment from the midpoint of the line connecting the positions of the speed detectors 12WS and 12DS toward the speed detectors 12WS and 12DS. may be defined as a range having a length between 5% and 15% of the length.

In the rolling mill 20 according to the present embodiment, in the width direction of the rolled material W, the strip speed of the rolled strip W is detected near the ends in the width direction and at the central position in the width direction, and the strip speed of the rolled strip at these positions is detected. By adjusting the roll gap of the work rolls 11 based on, the reduction phenomenon at the tail end of the rolled material W can be suppressed more efficiently.

In each of the above embodiments, the method of adjusting the left and right roll gaps of the work rolls 11 is based on the strip speed of the rolled material W detected by the speed detector 12, the material of the rolled material W, the size of the rolled material W, and the Based on the relational expression corresponding to the conveying speed, the roll gap of the work side or the driving side of the work roll 11, whichever is slower in the detected plate speed, is operated in the opening direction (the direction in which the distance between the work rolls increases). You may do so. Alternatively, the roll gap of the work rolls 11 may be opened and closed in accordance with the detected plate speed.

Alternatively, the roll gap adjustment allowance ΔS(i) is calculated by the method described in any one of the following third to seventh embodiments, and the left and right roll gaps of the work roll 11 are calculated based on this adjustment allowance. may be adjusted.

In each of the above embodiments, the speed detector 12 is not particularly limited as long as it can detect the plate speed of the rolled material W and transmit the data to a receiving device, a computing device, or the like. A plate speed detector or the like can be used.

Further, the speed detector 12 is provided above the rolled material W in the examples of the respective embodiments described above. However, the speed detector 12 may be provided below the rolled material W to detect the plate speed from below the rolled material W. If the plate speed of the rolled material W can be accurately detected, the distance from the rolled material W to the speed detector 12 does not matter.

In each of the above embodiments, the speed detector 12 may be connected to a member different from the side guide 13 so that the speed detector 12 can move independently.
Moreover, the shape of the side guide 13 does not matter as long as it can guide the rolled material W appropriately.

In each of the above embodiments, the speed detector 12 is more preferably provided within 1.0 m from the center C of the pair of work rolls 11 . By detecting the speed at a position close to the work roll 11 to be controlled, the width direction of the rolled material W produced by the roll bite of the rolling mill 10 to be controlled can be detected more accurately and with high reproducibility. It becomes possible to grasp the influence of the difference in elongation rate between the left and right in

In addition, as illustrated in FIG. 4 , a plurality of rolling mills may be provided in the rolling direction of the rolled material W to configure the rolling facility 30 . FIG. 4 is a schematic diagram showing part of the rolling facility 30. As shown in FIG. In the example of FIG. 4 , the rolling equipment 30 includes the rolling equipment 10 according to the first embodiment and the rolling equipment 1 provided upstream of the rolling equipment 10 in the conveying direction of the rolled material W (in FIG. (only work roll 11a', lower work roll 11b' and backup roll 14' are shown).

A plurality of rolling mills may be further provided upstream or downstream of the rolling mill 10 or the rolling mill 1 illustrated in FIG. In the rolling equipment 30, any one rolling mill may include the configuration of the rolling mill according to the first embodiment or the second embodiment, and all the rolling mills may have the structure of the rolling mill according to any of these embodiments. may include configuration.

As described above, in the conventional rolling equipment, the tension is released when the tail end of the rolled material comes off the upstream side in the conveying direction of the rolled material, that is, from the work roll of the immediately preceding rolling apparatus, and the rolled material meanders. becomes prominent. However, in the rolling mill according to the above-described embodiment, since a plurality of speed detectors are provided on the entrance side of the pair of work rolls to be controlled and in the vicinity thereof, , the effect of the difference in elongation in the width direction of the rolled material occurring in the roll bite of the rolling mill to be controlled can be grasped. Therefore, it is possible to adjust the roll gap for suppressing the narrowing phenomenon at the tail end of the rolled material.

A control method for the rolling mill according to the present invention will be described below.

[Third embodiment]
A control method according to the present embodiment is a control method for controlling a roll gap between a pair of work rolls for rolling a material to be rolled in a rolling mill. A detection step of detecting the strip speed of the rolled material at two speed detection positions on the entrance side of the roll and on the work side and the drive side of the work roll, and based on the detected strip speed, the work side and the work roll are detected. a calculating step of calculating a speed difference on the drive side; and an adjusting step of adjusting a roll gap between the work rolls of the pair of work rolls based on the calculated speed difference, wherein the speed detection position is the pair of work rolls. within 1.5 m from the center of

In the following embodiments, the start time of the control can be the moment when the rolled material passes through the work rolls of the rolling mill immediately before the rolling mill to be controlled, or before or after that. Alternatively, it may be the moment when the rolled material passes through the work rolls of the rolling mill immediately preceding the rolling mill to be controlled, or before or after that.

Whether or not the rolled material has passed between the work rolls is detected by combining the load change on the work roll of the previous rolling mill, the load change on the work roll of the previous rolling mill, and the distance timer. can. Alternatively, the vicinity of the work rolls of the rolling mill immediately preceding the rolling mill to be controlled is monitored by a detection device, and the time when the tail end of the rolled material passes a specific position or the tail end of the rolled material is detected at a specific position. The control start time may be calculated from the time when the edge passes and the time measured by the distance timer.
Alternatively, the time at which the rolled material leaves the work rolls of the rolling mill two units before the rolling mill to be controlled is measured, and the control start time is determined based on this time and the conveying speed of the rolled material. may In this case, the control may be started before the rolled material leaves between the work rolls of the rolling mill immediately preceding the rolling mill to be controlled.

Next, each step from the start of control will be described with reference to FIG.
First, the step of detecting the position of the rolled material (S100) is performed to detect the position of the tail end of the rolled material. In the example of the present embodiment, the passage of the tail end of the rolled material between the work rolls of the rolling mill immediately preceding the rolling mill to be controlled is used as a trigger (S101), and from that time the strip speed detection step (S102 ).

In the strip speed detection step (S102), the strip speed of the rolled material is detected at the work side and drive side speed detection positions on the entry side of the pair of work rolls to be controlled.
Here, if V _WS and V _DS are the plate speed on the work side and the plate speed on the drive side respectively, the difference between the plate speed on the work side and the plate speed on the drive side can be expressed by the following equation (1).

V _WD =V _WS -V _DS (1)

Next, based on this _VWD , the adjustment process (S104 to S108) is performed for adjusting the roll gap between the work rolls of the pair of work rolls.

In the adjustment process, V _WD (i−1), V _WD (i), V _WD (i+1) . . . is calculated to calculate the difference ΔV _WD (i) for each control cycle (S104).
Next, based on the difference ΔV _WD (i) for each control cycle, the gap adjustment allowance ΔS(i) is calculated from the following equation (2) (S106). Here, β is an adjustment factor considering mill stiffness and material composition factor.

ΔS(i)=βΔV _WD (i) (2)

Next, the work roll position is adjusted based on the gap adjustment allowance ΔS(i) (S108).

The above steps S102 to S108 may be repeated until the rolled material passes between the work rolls to be controlled (S109). For example, the steps S102 to S108 may be performed at specific control cycles or repeated a specific number of times.

In the above example, the working _- side speed difference _VWD with respect to the driving-side plate speed is calculated. may be controlled by

[Fourth Embodiment]
In the control method according to the present embodiment, in the calculating step, the strip thickness of the rolled strip at the speed detection position is calculated based on the preset transport speed of the rolled strip and the strip speed detected in the detecting step.

That is, the control method according to the present embodiment is a control method for controlling the roll gap between a pair of work rolls for rolling a material in a rolling mill. At a plurality of speed detection positions on the entrance side of the work roll, a detection step of detecting the strip speed of the rolled material, and based on the preset conveying speed of the rolled strip and the detected strip speed, at the speed detection position A calculating step of calculating the plate thickness of the rolled material, and an adjusting step of adjusting the roll gap between the work rolls of the pair of work rolls based on the calculated plate thickness, wherein the speed detection position is the pair of work rolls It is provided at two places on the work side and the drive side of the work roll, and is within a range of 1.5 m from the center of the pair of work rolls.

As in the third embodiment, the start time of the control can be the moment when the rolled material passes through the work rolls immediately before the work roll to be controlled, or before or after that. Alternatively, it may be the moment, or before or after, when the rolled material passes through the work rolls immediately before the work roll to be controlled.

Next, each step from the start of control will be described with reference to FIG.
First, a step of detecting the position of the rolled material (S200) is performed to detect the position of the tail end of the rolled material. In the example of the present embodiment, the passage of the tail end of the rolled material between the work rolls of the rolling mill immediately preceding the rolling mill to be controlled is used as a trigger (S201), and the strip speed detection step (S202) starts from that time. ).
In the strip speed detection step (S202), the strip speed of the rolled material is detected at the work side and drive side speed detection positions on the entry side of the pair of work rolls to be controlled.

Next, in the thickness calculation step (S204), the thickness of the rolled material at the speed detection position is calculated based on the preset conveying speed of the rolled material and the detected speed.
Here, _VWS and _VDS are the plate speed on the work side and the plate speed on the drive side, respectively, and the preset conveying speed of the rolled material is _VP , and _HWS and _HDS are the detection positions on the work side, respectively. , the virtual thickness at the side detection position on the drive side, and _HC are the thickness at the central position of the rolled material, the following equation (3) holds. H _C is the strip thickness on the entry side of the rolling mill to be controlled, and for example, the gauge strip thickness in the preceding rolling mill can be adopted.

V _WS ·H _WS =α · _VP · _HC (3)

Since the virtual plate thickness is obtained by measuring the plate speed at one point on one side, it is necessary to adjust the relationship depending on the plate width of the material. α is an adjustment coefficient introduced for the adjustment.

The following equation (4) can be derived from the above equation (3).

H _WS =α· _VP · _HC /V _WS (4)

Next, as in the third embodiment, the adjustment process (S206 to S210) for adjusting the roll gap between the pair of work rolls is performed based on the virtual plate thickness _HWS .

In the adjustment process, H _WS (i−1), H _WS (i), H _WS (i+1) . . . is calculated to calculate the difference ΔH _WS (i) for each control cycle (S206).
Next, based on the difference ΔH _WS (i) for each control cycle, the gap adjustment allowance ΔS(i) is calculated from the following equation (5) (S208). Here, β is an adjustment factor considering mill stiffness and material composition factor.

ΔS(i)=βΔH _WS (i) (5)

Next, the work roll position is adjusted based on the gap adjustment allowance ΔS(i) (S210).

In the above example, the working-side virtual plate thickness _HWS is calculated, but at the same time, the driving-side virtual plate thickness _HDS is calculated, and the above control is performed based on this calculation.

The above steps S202 to S210 may be repeated until the rolled material passes between the work rolls to be controlled (S211). For example, the steps from S202 to S210 may be performed at specific control cycles or repeated a specific number of times.

[Fifth embodiment]
The control method according to this embodiment basically has the same configuration as that of the fourth embodiment, but there are three speed detection positions: the working side and drive side of a pair of work rolls, and the center position of the rolled material. and performs gap adjustment based on the plate speed at these three detection positions.

As in the fourth embodiment, the start time of the control can be the moment when the rolled material passes through the work rolls immediately before the work roll to be controlled, or before or after that. Alternatively, it may be the moment, or before or after, when the rolled material passes through the work rolls immediately before the work roll to be controlled.

Next, each step from the start of control will be described with reference to FIG.
First, the step of detecting the position of the rolled material (S300) is performed to detect the position of the tail end of the rolled material. In the example of the present embodiment, the passage of the tail end of the rolled material between the work rolls of the rolling mill immediately preceding the rolling mill to be controlled is used as a trigger (S301), and from that time the strip speed detection step (S302 ).
In the strip speed detection step (S302), the strip speed of the rolled material is detected at the work-side and drive-side speed detection positions on the entry side of the pair of work rolls to be controlled.

Next, in the strip thickness calculation step (S304), the strip thickness at the speed detection position is calculated based on the strip speed detected at the three detection positions.
Here, _VWS and _VDS are the strip speed on the work side and the strip speed on the drive side, respectively, and the strip speed detected at the center position of the rolled material is _VC , and _HWS and _HDS are the strip speed on the work side, respectively. Assuming that the plate thickness at the side detection position and the virtual plate thickness at the side detection position on the driving side, _HC , is the plate thickness at the central position of the rolled material, the following equation (6) holds. H _C is the strip thickness on the entry side of the rolling mill to be controlled, and for example, the gauge strip thickness in the preceding rolling mill can be adopted.

V _WS ·H _WS =α ·V _C ·H _C (6)

Since the virtual plate thickness is obtained by measuring the plate speed at one point on one side, it is necessary to adjust the relationship depending on the plate width of the material. α is an adjustment coefficient introduced for the adjustment.

The following equation (7) can be derived from the above equation (6).

H _WS =α· _VC · _HC /V _WS (7)

Next, as in the fourth embodiment, the adjustment process (S306 to S310) is performed for adjusting the roll gap between the pair of work rolls based on the virtual plate thickness _HWS .

In the adjustment process, H _WS (i−1), H _WS (i), H _WS (i+1) . . . is calculated to calculate the difference ΔH _WS (i) for each control cycle (S306).
Next, based on the difference ΔH _WS (i) for each control cycle, the gap adjustment allowance ΔS(i) is calculated from the following equation (8) (S308). Here, β is an adjustment factor considering mill stiffness and material plasticity factor.

ΔS(i)=βΔH _WS (i) (8)

Next, the work roll position is adjusted based on the gap adjustment allowance ΔS(i) (S310).

In the above example, the working-side virtual plate thickness _HWS is calculated, but at the same time, the driving-side virtual plate thickness _HDS is calculated, and the above control is performed based on this calculation.

The above steps S302 to S310 may be repeated until the rolled material passes between the work rolls to be controlled (S311). For example, the steps S302 to S310 may be performed at specific control cycles or repeated a specific number of times.

[Sixth embodiment]
The control method according to this embodiment basically has the same configuration as that of the fourth embodiment. Based on this, the representative speeds on the working side and the driving side are calculated, and the virtual plate thicknesses of the rolled material on the working side and the driving side are calculated.

That is, the control method according to the present embodiment is a control method for controlling the roll gap between a pair of work rolls for rolling a material to be rolled in a rolling mill. At two speed detection positions on the entry side of a pair of work rolls and on the work side and the drive side of the work rolls, a detection process for detecting the strip speed of the rolled material and a predetermined conveying speed of the rolled material are detected. a speed calculation step of calculating a representative speed on the work side of the work roll and a representative speed on the drive side of the work roll based on the plate speed obtained, and driving the work side of the work roll and the work roll based on each representative speed A calculating step of calculating a virtual plate thickness at an arbitrary position of the rolled material on each side, and an adjusting step of adjusting the roll gap between the work rolls of the pair of work rolls based on the calculated virtual plate thickness , the speed detection position is within 1.5 m from the center of the pair of work rolls.

As in the fourth embodiment, the start time of the control can be the moment when the rolled material passes through the work rolls immediately before the work roll to be controlled, or before or after that. Alternatively, it may be the moment, or before or after, when the rolled material passes through the work rolls immediately before the work roll to be controlled.

Next, each step from the start of control will be described with reference to FIG.
First, a step of detecting the position of the rolled material (S400) is performed to detect the position of the tail end of the rolled material. In the example of this embodiment, the passage of the tail end of the rolled material between the work rolls of the rolling mill immediately preceding the rolling mill to be controlled is used as a trigger (S401), and from that time the strip speed detection step (S402 ).
In the strip speed detection step (S402), the strip speed of the rolled material is detected at the work side and drive side speed detection positions on the entry side of the pair of work rolls to be controlled.

Here, V _WS and V _DS are the plate speed on the work side and the plate speed on the drive side, respectively, and the preset conveying speed of the rolled material is _VP , and the representative speed V' is calculated by the following equation (9). (S404). The following example shows an example of calculating the representative speed _V'WS on the working side.

V' _WS =aV _WS +bV _P (9)

Here, the coefficients a and b in equation (9) are coefficients for weighting the velocities V _WS , V _DS and _VP when calculating the representative velocity. The coefficients a and b are determined by the width of the rolled material.

Next, in the virtual strip thickness calculation step (S406), the virtual strip thickness of the rolled material on the working side is calculated based on the representative speed V' _WS obtained by the equation (9).

_H'WS and _H'DS are the virtual plate thicknesses on the working side and the driving side, respectively (the virtual plate thickness is the thickness at any position on the working side or the driving side), and _HC is the central position of the rolled material. The following formula (10) holds when the plate thickness is used. H _C is the strip thickness on the entry side of the rolling mill to be controlled, and for example, the gauge strip thickness in the preceding rolling mill can be adopted.

V' _WS ·H' _WS = α · _VP · _HC (10)

Then, the following equation (11) is obtained from equations (9) and (10).

H' _WS =α· _VP · _HC /(aV _WS +bV _P ) (11)

Next, as in the fourth embodiment, the adjustment process (S408 to S412) is performed for adjusting the roll gap between the pair of work rolls based on the virtual plate thickness _H'WS .

In the adjustment process, H' _WS (i-1), H' _WS (i), H' _WS (i+1) . . . is calculated to calculate the difference ΔH′ _WS (i) for each control cycle (S408).
Next, based on the difference ΔH′ _WS (i) for each control cycle, the gap adjustment allowance ΔS(i) is calculated from the following equation (12) (S410). Here, β is an adjustment factor considering mill stiffness and material plasticity factor.

ΔS(i)= _βΔH'WS (i) (12)

Next, the work roll position is adjusted based on the gap adjustment allowance ΔS(i) (S412).

In the above example, an example of calculating the virtual plate thickness _H'WS at an arbitrary position on the working side was _shown . The above control is performed based on

The above steps S402 to S412 may be repeated until the rolled material passes between the work rolls to be controlled (S413). For example, the steps from S402 to S412 may be performed at specific control cycles or repeated a specific number of times.

In the control method of the present embodiment, the representative value based on the detected strip speed and the conveying speed is used for the gap adjustment instead of the strip speed at the strip speed detection position. Accurate control can still be achieved.

[Seventh Embodiment]
The control method according to this embodiment basically has the same configuration as that of the sixth embodiment, but in the calculation process, based on the plate speed at three locations detected in the detection process, The representative speed on the side is calculated, and the virtual plate thickness of the rolled material on the working side and the drive side is calculated.

That is, the control method according to the present embodiment is a control method for controlling the roll gap between a pair of work rolls for rolling a material in a rolling mill. A detection process for detecting the strip speed of the rolled material at three speed detection positions: the entrance side of the work roll, the work side and drive side of the work roll, and the center position of the rolled material, and based on these strip speeds A speed calculation step of calculating a representative speed on the work side of the work roll and a representative speed on the drive side of the work roll, and a rolled material on the work side of the work roll and the drive side of the work roll based on each representative speed and an adjustment step of adjusting the roll gap between the work rolls of the pair of work rolls based on the calculated virtual plate thickness, and the speed detection position is Within 1.5 m from the center of the pair of work rolls.

As in the fourth embodiment, the start time of the control can be the moment when the rolled material passes through the work rolls immediately before the work roll to be controlled, or before or after that. Alternatively, it may be the moment, or before or after, when the rolled material passes through the work rolls immediately before the work roll to be controlled.

Next, each step from the start of control will be described with reference to FIG.
First, the step of detecting the position of the rolled material (S500) is performed to detect the position of the tail end of the rolled material. In the example of the present embodiment, the passage of the tail end of the rolled material between the work rolls of the rolling mill immediately preceding the rolling mill to be controlled is used as a trigger (S501), and the strip speed detection step (S502) starts from that time. ).
In the strip speed detection step (S502), the strip speed of the rolled material is detected at the work side and drive side speed detection positions on the entry side of the pair of work rolls to be controlled.

Here, V _WS and V _DS are the plate speed on the work side and the plate speed on the drive side, respectively, and the plate speed detected at the center position of the rolled material is _VC , and the representative speed V' is expressed by the following equation (13). (S504). The following example shows an example of calculating the representative speed _V'WS on the working side.

V' _WS =aV _WS +bV _C (13)

Here, the coefficients a and b in equation (13) are coefficients for weighting the velocities V _WS , V _DS and _VP when calculating the representative velocity. The coefficients a and b are determined by the width of the rolled material.

Next, in the thickness calculation step (S506), the virtual thickness of the rolled material on the working side is calculated based on the representative speed _V'WS obtained from the equation (13).

_H'WS and _H'DS are the virtual plate thicknesses on the working side and the driving side, respectively (the virtual plate thickness is the thickness at any position on the working side or the driving side), and _HC is the central position of the rolled material. The following equation (14) holds when the plate thickness is used. H _C is the strip thickness on the entry side of the rolling mill to be controlled, and for example, the gauge strip thickness in the preceding rolling mill can be adopted.

V' _WS H' _WS =αV _C H _C (14)

Then, the following equation (15) is obtained from equations (13) and (14).

H' _WS =α· _VC · _HC /(aV _WS +bV _C ) (15)

Next, as in the other embodiments, based on this virtual plate thickness _H'WS , the process moves to the adjustment step (S508 to S512) for adjusting the roll gap between the pair of work rolls.

In the adjustment process, H' _WS (i-1), H' _WS (i), H' _WS (i+1) . . . is calculated to calculate the difference ΔH′ _WS (i) for each control cycle (S508).
Next, based on the difference ΔH′ _WS (i) for each control cycle, the gap adjustment allowance ΔS(i) is calculated from the following equation (16) (S510). Here, β is an adjustment factor considering mill stiffness and material plasticity factor.

ΔS(i)= _βΔH'WS (i) (16)

Next, the work roll position is adjusted based on the gap adjustment allowance ΔS(i) (S512).

In the above example, an example of calculating the virtual plate thickness _H'WS at an arbitrary position on the working side was _shown . The above control is performed based on

The above steps S502 to S512 may be repeated until the rolled material passes between the work rolls to be controlled (S513). For example, the steps S502 to S512 may be performed at specific control cycles or repeated a specific number of times.

In the control method of the present embodiment, the representative value based on the detected strip speed and the conveying speed is used for the gap adjustment instead of the strip speed at the strip speed detection position. Accurate control can still be achieved.

In the control method according to any one of the third to seventh embodiments, the gap adjustment allowance ΔS(i) of the roll gap is calculated, and the left and right work rolls are adjusted based on the gap adjustment allowance ΔS(i). Adjust the roll gap. For example, when the gap adjustment allowance ΔS(i) on the working side is calculated to be 0.1 mm, the work roll on the working side is raised by 0.1 mm.

In the control methods according to the third to seventh embodiments, the plate speed of the rolled material is detected at a plurality of speed detection positions near the work rolls on the entry side of the pair of work rolls to be controlled. Therefore, it becomes possible to accurately and reproducibly grasp the influence of the difference in elongation rate between the left and right sides of the rolled material in the width direction of the roll bite of the rolling mill, suppressing the reduction phenomenon at the tail end of the rolled material. It is possible to adjust the roll gap for

In the control methods according to the above third to seventh embodiments, the plate speed detection position on the working side or the driving side may be in the range of 100 mm to 200 mm from the end of the rolled material W.

Conventionally, the tail end rotates, tangles, and twists (twists), causing sparks when hitting the side guide, double, triple, or wrinkled and broken or torn. The problem was that the frequency of troubles and equipment damage troubles increased. However, according to the rolling mill or control method according to the present invention, these troubles can be efficiently avoided. Therefore, the rolling apparatus and control method according to the present invention are industrially extremely useful.

1, 10, 20 rolling mill 11 work roll 11a upper work roll 11b lower work roll 12, 12C, 12WS, 12DS speed detector 13 side guide 13WS working side side guide 13DS driving side side guide 14 reinforcement roll 30 rolling equipment W rolling material

Claims (11)

a pair of work rolls for rolling the rolling material;
a plurality of speed detectors provided on the entry side of the pair of work rolls;
with
The speed detector is provided within 1.5 m from the center of the pair of work rolls ,
further comprising a pair of side guides located on the entry side of the work rolls for guiding the rolled material from the working side and the drive side of the work rolls;
The speed detector is provided on each side guide of the pair of side guides.
A rolling device characterized by: 2. The method according to claim 1 , wherein each side guide is movable in the width direction of the work roll, and the position of the speed detector provided in each side guide follows the movement of the side guide. rolling equipment. 3. The rolling mill according to claim 1 , further comprising a speed detector for detecting a plate speed at a central position in the width direction of the rolled material. Further comprising speed setting means,
4. The rolling mill according to any one of claims 1 to 3 , wherein the conveying speed of the rolled material is set in advance by the speed setting means. In a rolling mill, a control method for controlling a roll gap between a pair of work rolls for rolling a material to be rolled, comprising:
a detection step of detecting the strip speed of the strip passing through the pair of work rolls at a plurality of speed detection positions on the entry side of the pair of work rolls to be controlled;
a calculation step of calculating the plate thickness of the rolled material at the speed detection position based on the plate speed;
An adjusting step of adjusting a roll gap between the work rolls of the pair of work rolls based on the plate thickness;
including
The speed detection position is within 1.5 m from the center of the pair of work rolls,
The rolling mill further comprises a pair of side guides located on the entry side of the work rolls for guiding the rolled material from the working side and the driving side of the work rolls,
A speed detector for detecting the plate speed is provided on each side guide of the pair of side guides.
A control method characterized by: 6. The control method according to claim 5 , wherein the speed detection positions are provided at two positions on the working side and the driving side of the pair of work rolls. 6. The control method according to claim 5 , wherein the speed detection positions are provided at three positions, that is, the work side and drive side of the pair of work rolls and the central position of the rolled material. In the calculating step, the strip thickness of the rolled strip at the speed detection position is calculated based on a preset conveying speed of the rolled strip and the strip speed detected in the detecting step. The control method according to any one of claims 5 to 7 . In a rolling mill, a control method for controlling a roll gap between a pair of work rolls for rolling a material to be rolled, comprising:
The speed of the strip passing through the pair of work rolls is detected at two speed detection positions on the entry side of the pair of work rolls to be controlled and on the work side and drive side of the work rolls. a detection step for
a calculating step of calculating a speed difference between the working side and the driving side of the work roll based on the plate speed;
an adjusting step of adjusting a roll gap between the work rolls of the pair of work rolls based on the speed difference;
including
The speed detection position is within 1.5 m from the center of the pair of work rolls,
The rolling mill further comprises a pair of side guides located on the entry side of the work rolls for guiding the rolled material from the working side and the driving side of the work rolls,
A speed detector for detecting the plate speed is provided on each side guide of the pair of side guides.
A control method characterized by: In a rolling mill, a control method for controlling a roll gap between a pair of work rolls for rolling a material to be rolled, comprising:
The speed of the strip passing through the pair of work rolls is detected at two speed detection positions on the entry side of the pair of work rolls to be controlled and on the work side and drive side of the work rolls. a detection step for
a speed calculation step of calculating representative speeds on the working side and the drive side of the work rolls based on the preset conveying speed of the rolled material and the strip speed;
a calculating step of calculating a virtual plate thickness at an arbitrary position of the rolled material on the working side and the driving side of the work roll based on the representative speed;
An adjusting step of adjusting a roll gap between the work rolls of the pair of work rolls based on the virtual plate thickness;
including
The speed detection position is within 1.5 m from the center of the pair of work rolls,
The rolling mill further comprises a pair of side guides located on the entry side of the work rolls for guiding the rolled material from the working side and the driving side of the work rolls,
A speed detector for detecting the plate speed is provided on each side guide of the pair of side guides.
A control method characterized by: In a rolling mill, a control method for controlling a roll gap between a pair of work rolls for rolling a material to be rolled, comprising:
It passes through the pair of work rolls at three speed detection positions: the entry side of the pair of work rolls to be controlled, the work side and drive side of the work rolls, and the center position of the rolled material. a detection step of detecting the plate speed of the rolled material;
a speed calculation step of calculating representative speeds on the working side and the drive side of the work roll based on the plate speed;
a calculating step of calculating a virtual plate thickness at an arbitrary position of the rolled material on the working side and the driving side of the work roll based on the representative speed;
An adjusting step of adjusting a roll gap between the work rolls of the pair of work rolls based on the virtual plate thickness;
including
The speed detection position is within 1.5 m from the center of the pair of work rolls,
The rolling mill further comprises a pair of side guides located on the entry side of the work rolls for guiding the rolled material from the working side and the driving side of the work rolls,
A speed detector for detecting the plate speed is provided on each side guide of the pair of side guides.
A control method characterized by:

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