JPH06262227A - Method for controlling rolling in sheet rolling mill - Google Patents

Abstract

PURPOSE:To control sheet crown and shape without time delay and with high accuracy by calculating a required amount of change of load of each divided back-up roll of a rolling mill and operating a width-direction thickness distribution/shape controller of the rolling mill taking this required amount of change as the target. CONSTITUTION:In at least either one of upper and lower roll assemblies, a work roll 1 is supported with divided back-up rolls 2A-3D which are divided in three divisions and more in the axial direction. Load detectors 5, 6 are respectively independently arranged on individual divided back-up rolls. Further the width-direction thickness distribution/shape controller for a rolled stock and sheet shape detector 7 are provided behind the sheet mill. The difference between a sheet shape detected with the sheet shape detector 7 behind the rolling mill and the desired sheet shape is calculated. The required amount of change of width-direction distribution of the rolling load that is exerted between a rolled stock and the work roll for dissolving this difference is calculated and further the required amount of change of the load of each divided back-up roll 2A-3D of the rolling mill for achieving the required amount of change of this rolling load distribution is calculated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rolling control of a plate rolling machine for reducing the thickness of a plate-shaped material or a band-shaped material by rolling to obtain a plate-shaped product or a band-shaped product having a predetermined thickness and a good shape. Regarding the method.

[0002]

2. Description of the Related Art In a known rolling technique, a strip crown / shape control of a rolled material is performed by placing a width direction strip thickness distribution measuring device and a strip shape detecting device on the exit side of the rolling mill, Detects the plate thickness and plate shape of the rolled material, and based on this detected signal,
The work roll bender, intermediate roll bender, intermediate roll shift, roll cross mechanism, etc. are operated to adjust the shape of the roll gap between the upper and lower work rolls.

However, according to this method of controlling the plate crown and shape of the rolling mill, when abnormalities in the plate crown and shape occur in the rolled material, the portion having the abnormal plate crown and shape is rolled, and the rolling mill is exited. After reaching the plate thickness distribution measuring device and the plate shape measuring device, the adjustment of the roll gap shape between the upper and lower work rolls is started. Therefore, it takes a long time to complete the adjustment of the work roll gap shape, and there is a problem in that the rolled material that has passed through the rolling mill during this time difference has not been corrected in the plate crown shape.

Further, in the conventional rolling mill, the distribution of the rolling load between the rolled material and the work roll in the strip width direction cannot be directly detected, and therefore the distribution of the rolling load in the strip width direction cannot be adjusted with high accuracy. Therefore, it is difficult to control the plate crown and shape of the rolled material with high accuracy.

[0005]

The present invention is capable of detecting the distribution of the rolling load between the rolled material and the work roll in the strip width direction, and adjusting the distribution of the rolling load in the strip width direction. It is an object of the present invention to provide a rolling control method for a plate rolling machine, which freely controls the deflection of the work rolls.

According to the present invention, when abnormalities of the plate crown and shape occur in the rolled material, these abnormalities can be detected as abnormal distribution of the rolling load in the width direction of the rolled material at the same time when the rolled material passes through the rolls, and there is no time delay. The crown and shape can be controlled. Further, according to the present invention, in order to control the work roll gap shape while detecting the distribution of the rolling load in the plate width direction,
It is possible to control the plate crown and shape with high accuracy.

[0007]

FIG. 1 is an explanatory view of an example of a plate rolling machine used in the present invention, (A) is a front explanatory view, and (B) is an example of arrangement of split reinforcing rolls of an upper roll assembly. FIG. The sheet rolling mill of the present invention will be described with reference to FIG. In the present invention, at least one of the upper and lower roll assemblies (FIG. 1 is an example of both the upper and lower roll assemblies) is axially divided into three or more (FIG. 1 is an example of seven divisions).
Split reinforcement rolls 2A, 2B, 2C, 3A,
A rolling mill having a mechanism for supporting the work roll 1 by 3B, 3C, and 3D, and an independent load detection device (5C) is provided for each split reinforcing roll (for example, 2C). Similarly, 6D in the figure is a load detecting device provided on the split reinforcing roll 3D.

Reference numerals 8C and 9D in the drawing are examples of a split reinforcing roll pressing device independently arranged on each split reinforcing roll. The split reinforcing roll reduction device may be of a hydraulic type, a screw type, or an eccentric sleeve type of bearing.
Reference numeral 11 denotes each unit U2A, ..., U3D including a split reinforcing roll, a load detection device, and a split reinforcing roll reduction device.
The inner housing 11 is attached to the mill housing 12 and is vertically movable by the mill pressure reducing device 13.

The rolling mill of the present invention also has a width direction plate thickness distribution / shape control device (not shown) using a rolling pattern control mechanism for the split reinforcing rolls and a work roll bender as an actuator. The width direction plate thickness distribution / shape control device includes the load detection devices 5A, 5B, 5C, 6A, 6B, 6C, 6
The load detected by D is input. In addition, each of the split reinforcing roll reduction devices 8A, 8B, 8C, 9A, 9B, 9C, 9D
Operate independently based on a command from the width direction plate thickness distribution / shape control device.

Reference numeral 7 in the drawing denotes a plate shape detecting device on the rear surface of the rolling mill.
Reference numeral 0 is a width direction plate thickness distribution measuring device on the rear surface of the rolling mill, and either or both of 7 and 10 are provided in the rolling mill. Each of 7 and 10 is connected to the width direction plate thickness distribution / shape control device (not shown).

In the first rolling control method of the present invention, the rolling mill illustrated in FIG. 1 provided with the plate shape detecting device 7 is used. In this rolling control method, the difference between the plate shape measurement value and the desired plate shape by the plate shape detection device on the rear surface of the rolling mill is calculated, and the rolling load acting between the rolled material and the work roll for eliminating this difference is calculated. Calculate the required variation of the widthwise distribution,
Further, the required change amount of the load of each split reinforcing roll of the rolling mill to realize the required change amount of the rolling load distribution is calculated, and the required change amount of the load of the split reinforcing rolls is targeted to the width direction of the rolling mill. Operate the plate thickness distribution / shape control device.

FIG. 2 is a flow chart of this method.
In FIG. 2, the control result of step 4 is fed back to step 1 to form a learning cycle. In the case where the rolled material under rolling has an abnormal plate crown / shape, the abnormal portion is detected as an abnormal load of the split reinforcing rolls at the same time when the abnormal roll passes through the rolls, and control is performed without time delay. The plate shape of the rolled material is controlled by this method.

In the second rolling control method of the present invention, the rolling mill illustrated in FIG. 1 equipped with the width direction plate thickness distribution measuring device 10 is used. In this control method, the difference between the plate thickness distribution measurement value by the width direction plate thickness distribution measuring device on the rear surface of the rolling mill and the desired plate thickness distribution is calculated, and a rolled material for eliminating this difference.
Calculate the required change in the width distribution of the rolling load acting between the work rolls, and further calculate the required change in the load of each split reinforcing roll of the rolling mill in order to realize the required change in the rolling load distribution. Then, the width direction plate thickness distribution / shape control device of the rolling mill is operated with a target of the required change amount of the load on the divided reinforcing rolls.

FIG. 3 is a flow chart of this method.
Also in FIG. 3, the learning cycle is formed in the same manner as described with reference to FIG. 2, and when abnormalities of the plate crown and shape occur in the rolled material during rolling, control without time delay is performed. This method controls the profile of the rolled material.

In the third rolling control method of the present invention, a rolling mill train having a plurality of rolling mills having two or more stands is used. The rolling mill of FIG. 1 is a rolling mill provided with a plate shape detecting device 7 and a width direction plate thickness distribution measuring device 10, and is arranged at the most downstream side of the rolling mill train. The other rolling mill arranged on the upstream side may be the rolling mill shown in FIG. 1 or a conventional type rolling mill, but at least one stand of the upstream rolling mill has a width-direction plate thickness distribution.・
A shape control device is provided.

In this control method, the difference between the plate shape measurement value by the shape detecting device on the rear surface of the rolling mill and the desired plate shape, and the plate thickness distribution measurement value by the width direction plate thickness distribution measuring device on the rear surface of the rolling mill and the desired plate shape are obtained. The amount of change in the strip thickness distribution on the inlet side of the most downstream rolling mill and the width of the rolling load that acts between the rolling material and the work roll in the most downstream rolling mill to calculate the difference from the strip thickness distribution and eliminate these differences at the same time. Calculate the required change amount of the direction distribution, and further calculate the operation target amount of the width direction plate thickness distribution / shape control device of the upstream rolling mill to realize the above-mentioned amount of change of the inlet side plate thickness distribution of the most downstream rolling mill. The above-mentioned rolled material of the downstream rolling mill ~
Calculate the required amount of change in the load of each split reinforcing roll of the rolling mill to realize the required amount of change in the rolling load distribution between work rolls, and first calculate the width direction plate thickness distribution of the upstream rolling mill according to the above target amount. The width direction plate thickness distribution / shape control device of the rolling mill is operated with the target of the required change amount of the split reinforcing roll load of the most downstream rolling mill after controlling and considering the transfer time of the rolled material.

FIG. 4 is a flow chart of this method.
Also in FIG. 4, the learning cycle is formed in the same manner as described with reference to FIG. 2, and control is performed without time delay even when a plate crown is generated in the rolled material during rolling. By this method, the shape and plate profile of the rolled material are controlled simultaneously.

[0018]

[Action]

The operation of the present invention

[Table 1] ~

It is explained in [Table 5].

[0020]

[Table 1]

[0021]

[Table 2]

[0022]

[Table 3]

[0023]

[Table 4]

[0024]

[Table 5]

[0025]

EFFECTS OF THE INVENTION By using the rolling control method for a sheet rolling mill of the present invention, it becomes possible to control the sheet crown and shape during rolling with high accuracy without time delay, and the sheet crown and shape control accuracy of the rolled sheet. It is possible to greatly improve the automation of these rolling mill operation operations that have conventionally relied on skilled operators.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of an example of a plate rolling machine used in the present invention.

FIG. 2 is a flowchart of a first rolling control method of the present invention.

FIG. 3 is a flow chart of a second rolling control method of the present invention.

FIG. 4 is a flow chart of a third rolling control method of the present invention.

FIG. 5 is a schematic diagram of a load acting on a work roll.

[Explanation of symbols]

1: work roll, 2 (2A to 2C): split supply roll,
3 (3A to 3D): split reinforcing rolls, 4: rolled material,
5 (5A to 5C): load detection device, 6 (6A to 6D): load detection device, 7: plate shape detection device, 8 (8A to 8)
C): Reduction device, 9 (9A to 9D): Reduction device, 10:
Width direction plate thickness distribution measuring device, 11: inner housing, 12: mill housing, 13: mill reduction device,
14: Bearing.

Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location B21C 51/00 N 8315-4E

Claims (3)

[Claims] 1. At least one of the upper and lower roll assemblies has a mechanism for supporting the work roll by divided reinforcing rolls divided into three or more parts in the axial direction, and each divided reinforcing roll is provided with a load detecting device independently. In addition, in the rolling control method of the strip rolling machine having the width direction strip thickness distribution / shape control device of the rolled material and the strip shape detection device on the rear surface of the rolling mill, the strip shape measured value by the strip shape detection device on the rear surface of the rolling mill and the desired value Calculate the required change in the widthwise distribution of rolling load that acts between the rolling material and work rolls to eliminate this difference, and then calculate the required change in this rolling load distribution. To achieve this, calculate the required amount of change in the load of each split reinforcing roll of the rolling mill, and aim at this required amount of change in the load of the split reinforcing rolls to determine the width-direction plate thickness distribution / shape of the rolling mill. Rolling control method for a plate rolling mill, characterized by operating the control device. 2. At least one of the upper and lower roll assemblies has a mechanism for supporting the work roll by divided reinforcing rolls divided into three or more parts in the axial direction, and each divided reinforcing roll is provided with a load detecting device independently. Further, in the rolling control method of the strip rolling mill having a width direction strip thickness distribution / shape control device for rolled material and a width direction strip thickness distribution measuring device on the rear surface of the rolling mill, the width direction strip thickness distribution measuring device on the rear surface of the rolling mill is provided. By calculating the difference between the plate thickness distribution measured value and the desired plate thickness distribution by calculating the required change amount of the width distribution of the rolling load acting between the rolled material ~ work roll to eliminate this difference, further The required change amount of the load of each split reinforcing roll of the rolling mill to realize the required change amount of the rolling load distribution is calculated, and the required change amount of the load of the split reinforcing rolls is used as a target for the rolling. Rolling control method for a plate rolling mill, which comprises operating the widthwise thickness distribution and shape control. 3. A plurality of rolling mills having two or more stands, and at least one of the upper and lower roll assemblies of the most downstream rolling mill supports a work roll by a split reinforcing roll divided into three or more axial portions. Each split reinforcing roll is equipped with an independent load detection device, and the width direction plate thickness distribution / shape control device of the rolled material and the plate shape detection device and width direction plate thickness distribution measurement on the rear surface of the rolling mill are performed. In a rolling control method for a strip rolling mill, which has a device and has a width direction strip thickness distribution / shape control device in at least one stand of other upstream rolling mills, a strip shape measurement value by a shape detection device on the rear surface of the rolling mill and Calculate the difference from the desired strip shape and the difference between the strip thickness distribution measurement value on the rear surface of the rolling mill by the width direction strip thickness distribution measurement device and the desired strip thickness distribution, and solve these differences simultaneously. In order to do, calculate the change amount of the inlet side plate thickness distribution and the required change amount of the width direction distribution of the rolling load that acts between the rolling material and the work rolls in the most downstream rolling mill, and further the most downstream rolling mill. Calculating the operation target amount of the width direction plate thickness distribution / shape control device of the upstream rolling mill to realize the change amount of the inlet side plate thickness distribution, and the required change of the rolling load distribution between the rolling material and the work rolls of the most downstream rolling mill. Calculate the required amount of change in the load of each split reinforcing roll of the rolling mill to realize the amount, and first, control the widthwise plate thickness distribution of the upstream rolling mill according to the above target amount, and transfer time of the rolled material. In consideration of the above, the rolling control method for a strip rolling mill is characterized by operating the width direction strip thickness distribution / shape control device of the rolling strip targeting the required change amount of the split reinforcing roll load of the downstream rolling mill. .