JP2009113109A - Load distribution control device for continuous rolling mill - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a load distribution control device for a continuous rolling mill capable of using a state after the manual intervention by an operator of the mill as a target value of the rolling load ratio. <P>SOLUTION: The load distribution control device includes rolling load detectors 5-7 provided on each stand of a continuous rolling mill, a load distribution controller 11 for calculating the thickness correction amount to each stand based on the experienced rolling load, rolling-reduction position controllers 8-10 for controlling the rolling-reduction position of each stand based on the thickness correction amount, and a rolling-reduction manual intervention functional unit 16 for manually correcting the rolling-reduction position of each stand irrespective of the result of computation of the load distribution controller 11. The load distribution controller 11 resets the target value of the rolling load ratio based on the experienced rolling load at that time when the rolling-reduction position of each stand is manually corrected by the rolling-reduction position manual intervention functional unit 16. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a load distribution control device for making a distribution ratio of a rolling load of each stand coincide with a target value in a continuous rolling mill having a plurality of stands.

  In general, the sheet thickness reduction ratio for each stand of a continuous rolling mill is determined by the distribution ratio of rolling load of each stand (hereinafter simply referred to as “rolling load ratio”). That is, a desired sheet thickness reduction ratio is obtained by controlling the rolling load ratio with respect to each stand so as to coincide with a predetermined target value. Note that the target value of the rolling load ratio is set to an optimum value in consideration of factors such as the base metal plate thickness, product plate thickness, rating of each rolling mill, stable operation and shape quality.

On the other hand, the actual rolling load ratio at the time of rolling often does not match the predicted value due to the accuracy limit of the rolling model formula, the characteristics of the rolling mill, the plastic deformation due to the temperature change after the start of rolling, and various other disturbances. Such deviations in the rolling load ratio cause various problems such as an increase in dimensional deviations such as product plate thickness and product plate width, shape defects, unstable rolling, and rolling stop due to various equipment rating limits. Resulting in.
For the above problem, conventionally, the mill operator manually corrects the rolling position while monitoring the actual rolling state, thereby correcting the deviation of the rolling load ratio and ensuring stable operation and constant shape quality. It was like that.

  Further, as a conventional technique, a configuration that can automatically ensure an optimal load distribution to each stand, that is, an optimal rolling load ratio, without depending on manual intervention of a mill operator is disclosed in Patent Document 1 below. Has been. In the thing of patent document 1, when the rolling load ratio with respect to each stand does not correspond with the preset target value, first, from the difference | error with the target value of a rolling load ratio, the plate | board thickness of each stand is based on the rolling principle. The correction amount is calculated. Then, after changing the outlet side plate thickness of the upstream stand based on the calculation result, the reduction position of the downstream stand is corrected at the timing when the plate thickness change point arrives at the downstream stand. With this operation, the rolling load ratio is matched with the target value without changing the outlet side plate thickness at the downstream stand during rolling.

  Since the inverse matrix is included in the arithmetic expression for deriving the thickness correction amount of each stand, the processing load is too large to perform the calculation by the controller of the rolling mill. There was a problem. For this reason, it is difficult to implement all of the calculation functions in the controller, and in reality, a method in which a part that can be executed before rolling is calculated in advance and the other part is calculated by the controller during rolling. Had to be adopted. In addition, due to the restriction that the inverse matrix must be calculated before rolling, there is also a problem that only the control of the rolling load ratio based on the target value set before rolling, that is, control over the total length of the material can be performed. It was. That is, it was not possible to change the target value of the rolling load ratio during rolling and then perform control targeting the changed value.

  The prior art made in order to solve the said subject is a thing of the following patent document 2. FIG. In the thing of patent document 2, it is comprised so that most of the calculation can be performed with the controller in rolling by simplifying the calculation formula for deriving the plate | board thickness correction amount of each stand by a predetermined method. ing. For this reason, it became possible to change the target value of the rolling load ratio during rolling, and then to perform control based on the changed target value. That is, when controlling the rolling load ratio, it is no longer necessary to use the same target value for the entire length of the material, and the rolling load ratio at the stable point after the rolled material has been caught in all the stands is newly set as the subsequent target value. It became possible to set to.

Japanese Patent Publication No. 2-39327 JP 2005-88054 A

  In the ones described in Patent Documents 1 and 2, as described above, the load distribution control is performed with the value set by the calculation before rolling or the value set by the calculation during rolling as a target. However, the target value of the rolling load ratio is a value expected by calculation to the last, and the value set by calculation is not always a correct value as a target from the viewpoint of stable operation and shape quality.

For such a problem, for example, the following solutions can be considered.
1. In the calculation for setting the target value performed before rolling, the calculation accuracy is improved.
2. The rolling load ratio is adjusted during rolling using some actual value detected by a sensor or the like.
3. According to the judgment of the mill operator observing the state of the rolled material during rolling, the rolling position is manually corrected (or corrected by some method) and the rolling load ratio is adjusted during rolling.

  Regarding Solution 1, there is a limit to improving the calculation accuracy to the extent that satisfaction is obtained from the viewpoint of stable operation and shape quality. In addition, with regard to the above Solution 2, it is difficult to comprehensively determine the state of the rolled material based on some actual value. For this reason, if many sensors are installed, there is a problem that the system configuration becomes extremely complicated. there were. Therefore, at the present time, the method according to the above solution 3 is practical and practical. However, conventionally, even if the method according to Solution 3 is adopted, the state after manual intervention by the mill operator cannot be used as the target value of the rolling load ratio, and the quality of the rolled product is always kept high. There was a problem that it could not be maintained.

  The present invention has been made to solve the above-described problems. The purpose of this invention is that the mill operator can manually correct the rolling load ratio for each stand during rolling according to the judgment of the mill operator. A state after manual intervention can be used as a target value of a rolling load ratio, and thereby provide a load distribution control device for a continuous rolling mill that can greatly improve the quality of a rolled product.

  The load distribution control device for a continuous rolling mill according to the present invention is a load distribution control device for a continuous rolling mill for matching the rolling load ratio for each stand of the continuous rolling mill to a target value, and is provided in each stand. When the rolling load detector that detects the rolling load of each stand and the rolling load ratio based on the rolling load of each stand detected by the rolling load detector does not match the target value, the rolling load ratio becomes the target value. A load distribution controller for calculating the thickness correction amount of each stand so as to match, and a reduction position controller for controlling the reduction position of each stand based on the plate thickness correction amount calculated by the load distribution controller; A reduction position manual intervention function for manually correcting the reduction position of each stand regardless of the calculation result of the load distribution controller, and the load distribution controller includes a reduction position manual intervention machine. When the pressing position of the stand is manually modified by parts, based on the rolling load of each stand detected by the rolling load detector, it is to re-set the target value of the rolling load ratio.

  Further, the load distribution control device for a continuous rolling mill according to the present invention is a load distribution control device for a continuous rolling mill for making the rolling load ratio for each stand of the continuous rolling mill coincide with a target value, and is provided in each stand. Rolling load detector for detecting the rolling load of each stand, and the rolling load ratio based on the rolling load of each stand detected by the rolling load detector does not match the target value, the rolling load ratio is the target. The load distribution controller that calculates the thickness correction amount of each stand so that it matches the value, and the reduction position control that controls the reduction position of each stand based on the plate thickness correction amount calculated by the load distribution controller Regardless of the calculation results of the load controller and the load distribution controller, a negative position manual intervention function unit for manually correcting the reduction position of each stand and a predetermined manual operation The allocation controller, based on the rolling load of each stand detected by the rolling load detector, is obtained with a manual reset function unit for resetting the target value of the rolling load ratio, a.

  Further, the load distribution control device for a continuous rolling mill according to the present invention is a load distribution control device for a continuous rolling mill for making the rolling load ratio for each stand of the continuous rolling mill coincide with a target value, and is provided in each stand. Rolling load detector for detecting the rolling load of each stand, and the rolling load ratio based on the rolling load of each stand detected by the rolling load detector does not match the target value, the rolling load ratio is the target. The load distribution controller that calculates the thickness correction amount of each stand so that it matches the value, and the reduction position control that controls the reduction position of each stand based on the plate thickness correction amount calculated by the load distribution controller Regardless of the operation result of the loader and the load distribution controller, the rolling position manual intervention function for manually correcting the rolling position of each stand and the target value of the rolling load ratio are set before rolling. A setting operation of the fit, based on numerical input directly by manual input, but with a setting correcting unit for resetting during rolling target value of rolling load ratio, a.

  According to this invention, when the rolling load ratio for each stand during rolling is manually corrected by the judgment of the mill operator, the state after manual intervention by the mill operator can be used as the target value of the rolling load ratio. This can significantly improve the quality of the rolled product.

  In order to explain the present invention in more detail, it will be described with reference to the accompanying drawings. In addition, in each figure, the same code | symbol is attached | subjected to the part which is the same or it corresponds, The duplication description is simplified or abbreviate | omitted suitably.

  FIG. 1 is a block diagram showing a common part of a load distribution control device for a continuous rolling mill according to the present invention. Based on FIG. 1, a specific configuration of the load distribution control device and its function (calculation method for load distribution control) and the like will be described.

  FIG. 1 shows any three consecutive stands among a plurality of (N) stands provided in the continuous rolling mill. That is, i represents an arbitrary stand, i-1 represents a stand adjacent to the upstream side of the i stand, and i + 1 represents a stand adjacent to the downstream side of the i stand.

  Each stand is provided with a pair of rolling rolls arranged vertically. That is, in FIG. 1, 1a and 1b are rolling rolls provided on the upstream i-1 stand, 2a and 2b are rolling rolls provided on the i stand, and 3a and 3b are provided on the downstream i + 1 stand. A rolling roll is shown. When the rolled material 4 passes through the upstream i-1 stand, the i stand, and the downstream i-1 stand, the rolling material 4 sequentially passes between the rolling rolls 1a and 1b, 2a and 2b, and 3a and 3b. Thus, rolling is performed so as to approach the desired plate thickness. In addition, the arrow A in FIG. 1 has shown the rolling direction.

  Of the pair of rolling rolls in each stand, rolling load detectors 5 to 7 are connected to the rolling rolls 1b, 2b, 3b arranged below. The rolling load detectors 5 to 7 detect the rolling loads at the stands i−1 to i + 1. In addition, the rolling position controllers 8 to 10 are connected to the rolling rolls 1a, 2a, and 3a arranged above the pair of rolling rolls of each stand, respectively. The reduction position controllers 8 to 10 have a function of controlling the reduction position in each stand. That is, the rolling load of each stand is adjusted by the rolling position control by the rolling position controllers 8 to 10.

11 is a load distribution controller. The load distribution controller 11 receives the rolling load (F _i−1 , F _i , F _{i + 1} ) of each stand detected by the rolling load detectors 5 to 7, and the rolling load ratio obtained from this input value. , The appropriate thickness correction amount (Δh _i−1 , Δh _i , Δh _{i + 1} ) of each stand is calculated so as to match the target value. The reduction position controllers 8 to 10 calculate roll gap correction amounts (ΔS _i−1 , ΔS _i , ΔS _{i + 1} ) based on the plate thickness correction amount, which is an output value of the load distribution controller 11. Then, the position of the rolling rolls 1a, 2a, 3a, that is, the roll gap is corrected. Such an operation realizes control (load distribution control) for making the rolling load ratio for each stand coincide with a predetermined target value.

Next, the configuration and functions of the load distribution controller 11 will be specifically described.
The load distribution controller 11 includes, for example, a plate thickness correction amount calculation unit 12 and a controller unit 13. First, the plate thickness correction amount calculation unit 12 determines whether or not the current rolling load ratio matches the target value based on the input rolling loads (F _i−1 , F _i , F _{i + 1} ) of each stand. Is done. When it is determined that they do not match (for example, the current rolling load ratio is not within a predetermined range), the thickness correction amount of each stand is calculated based on the deviation from the target value. Further, the controller unit 13 performs a process using a predetermined function on the calculation result of the plate thickness correction amount calculation unit 12, thereby finalizing the load distribution controller 11 including two components of a proportional term and an integral term. The correct output value is calculated.

The operation of the load distribution controller 11 will be specifically described below.
The rolling loads (F _i−1 , F _i , F _{i + 1} ) detected by the rolling load detectors 5 to 7 always change depending on the rolling situation. Here, when representing the variation [Delta] F _i of the rolling load in relation to the thickness of the rolled material 4 becomes the following equation.

ここで、ΔＨ_ｉは入側板厚変化量、Δｈ_ｉは出側板厚変化量、Ｑ_ｉはΔＦ_ｉに対するΔＨ_ｉの影響感度、ｑ_ｉはΔＦ_ｉに対するΔｈ_ｉの影響感度である。

Here, [Delta] H _i is thickness at entrance side variation, Delta] h _i exits side thickness variation, _{Q i} influence the sensitivity of [Delta] H _i for ΔF _{i, q i} is the impact sensitivity of Delta] h _i for [Delta] F _i.

上記式（１）及び式（２）と、ΔＨ_ｉ≒Δｈ_ｉ−１の関係とにより、次式が得られる。

From the above formulas (1) and (2) and the relationship ΔH _i ≈Δh _i−1 , the following formula is obtained.

ここで、ｉ＝１のスタンドの入側板厚に関しては、ΔＨ_１＝０とした。更に、Ｑ_ｉ≒ｑ_ｉと仮定して、上記式（３）を変形すると、下記式（４）及び式（５）の近似式を得ることができる。

Here, regarding the entrance side plate thickness of the stand where i = 1, ΔH ₁ = 0. Furthermore, assuming that Q _i ≈q _i , when the above equation (3) is modified, approximate equations of the following equations (4) and (5) can be obtained.

By using the above equation (4) and (5), without performing the operation of complicated inverse matrix, it is possible to obtain the plate thickness correction amount Delta] h _i for the ever-changing rolling force during rolling . Moreover, since the thickness correction amount is calculated using the above formulas (4) and (5) during rolling, a target value (C _i-1 : C _i : C _{i + 1} ) of the rolling load ratio is set during rolling. It is also possible to set again.

  Here, the rolling load ratio lock-on function unit 15 in FIG. 1 has a function of resetting the target value of the rolling load ratio during rolling. For example, the rolling load ratio lock-on function unit 15 is configured so that after rolling starts, a stable point after the rolled material 4 is bitten in all stands (for example, after a predetermined time has elapsed since the rolling material 4 is bitten in all stands). The target value of the rolling load ratio is reset based on the rolling load in (1). When the target value of the rolling load ratio is reset during rolling, the plate thickness correction amount calculation unit 12 calculates the plate thickness correction amount based on the reset target value.

  In the continuous rolling mill having the above-described configuration, the rolling position is manually corrected from the viewpoint of stable operation and shape quality by a mill operator who observes the state of the rolling material 4 during rolling. The function of the load distribution control device in such a case and the configuration for realizing the function will be specifically described below.

Embodiment 1 FIG.
2 is a block diagram showing a load distribution control device for a continuous rolling mill according to Embodiment 1 of the present invention. In FIG. 2, reference numeral 16 denotes a reduction position manual intervention function unit for correcting the reduction position of each stand by manual intervention. The reduction position manual intervention function unit 16 is configured to be able to manually correct the reduction position regardless of the calculation result of the load distribution controller 11. For example, the reduction position manual intervention function unit 16 is attached to a reduction position control system that controls the roll gap. Provided.

  As described above, the target value of the rolling load ratio set by a predetermined calculation before or during rolling is not necessarily a correct value from the viewpoint of safe operation and shape quality. For this reason, the mill operator always observes the state of the rolling material 4 during rolling, and the rolling load ratio may be manually adjusted as necessary. At this time, the mill operator manually corrects the rolling load ratio by operating the reduction position manual intervention function unit 16.

  According to Embodiment 1 of the present invention, even if the rolling load ratio for each stand during rolling is manually corrected by the judgment of the mill operator, the state after manual intervention by the mill operator is determined as the rolling load ratio. This can be used as a target value for the rolled product, which can greatly improve the quality of the rolled product.

  Specifically, after the rolling load ratio is set at the stable point after the rolled material 4 has been bitten into all the stands, the rolling load ratio is reset again by manual intervention of the mill operator. The target value of the rolling load ratio is reset based on the actual rolling load value after the intervention. For this reason, it is possible to adopt a more optimal rolling load ratio target value while respecting the judgment of skilled mill operators, and contribute to improving the quality and high added value of rolled products. Become.

  As described above, the mill operator always observes the state of the rolled material 4 during rolling, and manually corrects the rolling load ratio as necessary. In the first embodiment, the configuration in which the rolling load ratio target value is automatically reset by performing manual correction of the rolling load ratio has been described. On the other hand, in Embodiment 2, the target value of the rolling load ratio is performed by a manual operation on the manual reset function unit 17 by the mill operator. That is, when the mill operator observes the state of the rolling material 4 during rolling and determines that the load distribution at that time is optimal and the rolling load ratio in that state should be targeted, the manual reset function The unit 17 is operated.

  Even in the above configuration, the same effects as those of the first embodiment can be obtained. In addition, according to the above configuration, since the target value of the rolling load ratio is not reset unless the manual reset function unit 17 is manually operated, the mill is more automatically set than that described in the first embodiment. The driver's judgment can be more respected.

  According to such a configuration, it becomes possible to limit the resetting of the target value of the rolling load ratio to those who have been permitted in advance, and it is possible to prevent erroneous operations and the like.

Embodiment 3 FIG.
4 is a block diagram showing a load distribution control device for a continuous rolling mill according to Embodiment 3 of the present invention. In FIG. 4, reference numeral 18 denotes a correction function unit for resetting the target value of the rolling load ratio during rolling. This correction function part 18 is for resetting the target value of the rolling load ratio by a method different from the method in the second embodiment. That is, when the mill operator determines that the target value of the rolling load ratio at that time is not appropriate during the observation of the rolling state, the mill operator directly inputs a numerical value manually to the correction function unit 18. To reset the target value.

  According to such a configuration, the target value of the rolling load ratio can be reset by various methods, and a load distribution control device with excellent operability can be provided. Other configurations and effects are the same as those in the first or second embodiment. FIG. 4 shows an example in which the correction function unit 18 is added to the configuration of the second embodiment.

It is a block diagram which shows the common part of the load distribution control apparatus of the continuous rolling mill in this invention. It is a block diagram which shows the load distribution control apparatus of the continuous rolling mill in Embodiment 1 of this invention. It is a block diagram which shows the load distribution control apparatus of the continuous rolling mill in Embodiment 2 of this invention. It is a block diagram which shows the load distribution control apparatus of the continuous rolling mill in Embodiment 3 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1a, 1b, 2a, 2b, 3a, 3b Roll roll 4 Rolled material 5, 6, 7 Rolling load detector 8, 9, 10 Rolling position controller 11 Load distribution controller 12 Sheet thickness correction amount calculating part 13 Controller part 14 Setting Calculation Unit 15 Rolling Load Ratio Lock-on Function Unit 16 Rolling Position Manual Intervention Function Unit 17 Manual Reset Function Unit 18 Correction Function Unit

Claims (5)

A load distribution control device for a continuous rolling mill for matching a rolling load ratio for each stand of the continuous rolling mill to a target value,
A rolling load detector that is provided in each stand and detects a rolling load of each stand;
When the rolling load ratio based on the rolling load of each stand detected by the rolling load detector does not match the target value, the thickness of each stand is corrected so that the rolling load ratio matches the target value. A load distribution controller for calculating the quantity;
A reduction position controller that controls the reduction position of each stand based on the plate thickness correction amount calculated by the load distribution controller;
Regardless of the calculation result of the load distribution controller, a reduction position manual intervention function unit for manually correcting the reduction position of each stand,
With
The load distribution controller, based on the rolling load of each stand detected by the rolling load detector when the rolling position of the stand is manually corrected by the rolling position manual intervention function unit, the rolling load ratio A load distribution control device for a continuous rolling mill characterized by resetting a target value for the continuous rolling mill. A manual reset function unit that performs a predetermined manual operation when it is necessary to reset the target value of the rolling load ratio;
Further comprising
The load distribution controller is detected by a rolling load detector when the rolling position of the stand is manually corrected by the rolling position manual intervention function section and the predetermined manual operation is performed on the manual reset function section. The load distribution control device for a continuous rolling mill according to claim 1, wherein a target value of a rolling load ratio is reset based on the rolling load of each of the stands. A setting calculation unit for setting the target value of the rolling load ratio before rolling;
A setting correction unit that resets the target value of the rolling load ratio during rolling based on numerical values directly input by manual input,
The load distribution control device for a continuous rolling mill according to claim 1 or 2, further comprising: A load distribution control device for a continuous rolling mill for matching a rolling load ratio for each stand of the continuous rolling mill to a target value,
A rolling load detector that is provided in each stand and detects a rolling load of each stand;
When the rolling load ratio based on the rolling load of each stand detected by the rolling load detector does not match the target value, the thickness of each stand is corrected so that the rolling load ratio matches the target value. A load distribution controller for calculating the quantity;
A reduction position controller that controls the reduction position of each stand based on the plate thickness correction amount calculated by the load distribution controller;
Regardless of the calculation result of the load distribution controller, a reduction position manual intervention function unit for manually correcting the reduction position of each stand,
A manual reset function unit that causes the load distribution controller to reset the target value of the rolling load ratio based on the rolling load of each stand detected by the rolling load detector by performing a predetermined manual operation. When,
A load distribution control device for a continuous rolling mill. A load distribution control device for a continuous rolling mill for matching a rolling load ratio for each stand of the continuous rolling mill to a target value,
A rolling load detector that is provided in each stand and detects a rolling load of each stand;
When the rolling load ratio based on the rolling load of each stand detected by the rolling load detector does not match the target value, the thickness of each stand is corrected so that the rolling load ratio matches the target value. A load distribution controller for calculating the quantity;
A reduction position controller that controls the reduction position of each stand based on the plate thickness correction amount calculated by the load distribution controller;
Regardless of the calculation result of the load distribution controller, a reduction position manual intervention function unit for manually correcting the reduction position of each stand,
A setting calculation unit for setting the target value of the rolling load ratio before rolling;
A setting correction unit that resets the target value of the rolling load ratio during rolling based on numerical values directly input by manual input,
A load distribution control device for a continuous rolling mill.

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