JPH02142607A - Device for controlling shape in rolling mill - Google Patents

Abstract

PURPOSE:To perform high efficient and accurate rolling by composing a mechanism so that an optimum operation terminal can be selected in on-line in accordance with situations by using a prescribed shape evaluation function by an optimum operation terminal selecting means. CONSTITUTION:An optimum operation terminal selecting circuit 8 selects an operation terminal capable of minimizing a shape evaluation function Ji among plural terminals by using the function Ji defined based on an operation amount from a control output arithmetic circuit 7, a deviation DELTAAi between a development result from a mode development arithmetic circuit 5 and a target shape, and a shape influence coefficient bij for each operation terminal and makes the selected terminal act with an operation amount determined by the circuit 7. Therefore, an optimum terminal is selected per control cycle with on-line and automatic selection of an optimum terminal in accordance with a situation is always performable, so that function of a rolling mill having plural operation terminals is sufficiently displayed and high efficient and accurate controlling effects are obtained.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a rolling mill shape control device suitable for use in a rolling mill having a large number of operating ends for controlling the shape of a rolled material. .

[Prior art] In conventional rolling mills, the plate shape is developed into a normalized orthogonal function based on the measurement data of a shape meter (plate width gauge, plate thickness gauge, etc.), so as to eliminate errors with the target shape. The manipulated variable is determined by the product of the shape influence coefficient of the operating end and the shape error, which is determined on a one-to-one basis for each order.

FIG. 2 is a block diagram showing a shape control device for a conventional rolling mill of this type. In the figure, 1 is a rolling mill, and 2 is a rolled steel plate (rolled material) that is rolled into a target shape by this rolling mill 1.
, 3 is an arrow indicating the rolling direction, 4 is a shape meter (shape detection means) such as a sheet width meter or sheet thickness meter, and 5 is an elongation that expands the sheet shape into a normalized orthogonal function based on the measurement data from the shape meter 4. A rate mode expansion calculation circuit (mode expansion calculation means), 6 a target shape setting circuit, 7 a control output for determining the operation amount in the rolling mill 1 based on data from the elongation rate mode expansion calculation circuit 5 and the target shape setting circuit 6. It is a calculation circuit (control output calculation means).

Next, the operation will be explained. The shape (elongation rate) of the rolled steel plate 2 rolled in the rolling direction 3 by the rolling mill 1 is detected by the shape meter 4, and the elongation rate is expanded into a normalized orthogonal function by the mode expansion calculation circuit 5, and the expansion result is and the target value set by the target shape setting circuit 6. Then, using the shape mode deviation as an input parameter, the control output calculation circuit 7 calculates the inverse matrix of the shape influence coefficient matrix P (matrix with i rows and j columns), and calculates the shape mode deviation ΔAl
Multiplying the equation (1) below, find the control amount (operation amount) Δuj of each operating end that is one-to-one with each shape mode, and
The shape of the rolled steel plate 2 is controlled by operating the operating end of the rolling mill 1.

Δuj=(P door 1×ΔA1...(1) However, these are.

[Problem to be solved by the invention] Since the shape control device of the conventional rolling mill is configured as described above, it is difficult to control the shape control device for each shape mode in the current multi-operating end shape control mills such as the 6Hi mill and CR mill. If there are multiple operating ends, the operating ends must be selected in advance so that each shape mode and the operating end are in a one-to-one relationship, and the operating ends cannot be fully utilized. It is necessary to configure the control system to find the optimal operating terminal online according to the current situation and use all operating terminals.

This invention was made in order to solve the above-mentioned problems, and it enables highly efficient and highly accurate rolling by automatically selecting the optimal operating end and controlling the shape with the optimal operating amount. The purpose is to obtain a shape control device for a rolling mill that makes it possible to control the shape of a rolling mill.

[Means for Solving the Problems] The shape control device for a rolling mill according to the present invention is configured to control the amount of operation from the control output calculation means, the deviation between the expansion result by the mode expansion calculation means and the target shape, and the shape of each operating end. The apparatus is equipped with an optimum operating end selection means for selecting an operating end that can minimize the shape evaluation function from among a plurality of operating ends using a shape evaluation function defined based on an influence coefficient, and operating the operating end with the aforementioned operating amount.

[Made for production] In the shape control device for a rolling mill according to the present invention.

The optimal operating end selection means allows the currently optimal operating end to be selected online, and by changing the operating end at any time, it is possible to fully utilize the effects of a rolling mill having a plurality of operating ends.

[Embodiments of the invention] An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, as in the conventional apparatus, 1 is a rolling mill, 2 is a rolled steel plate (rolled material) rolled into a target shape by this rolling mill 1, 3 is an arrow indicating the rolling direction, 4 is a strip width gauge, Shape gauges (shape detection means) such as plate thickness gauges.

5 is an elongation rate mode expansion calculation circuit (mode expansion calculation means) that expands the plate shape into a normalized orthogonal function based on the measurement data from the shape meter 4; 6 is a target shape setting circuit; and 7 is an elongation rate mode expansion calculation circuit 5. and a control output calculation circuit (control output calculation means) that determines the operation amount in the rolling mill 1 based on data from the target shape setting circuit 6, and this control output calculation circuit 7 is a mode development calculation circuit as in the past. 5 and the target value set by the target shape setting circuit 6, and using the shape influence coefficient matrix P, the control amount (
This is to obtain the manipulated variable) Δuj.

In the apparatus of this embodiment, 8 is an optimal operating end selection circuit (optimum operating end selection means), and this optimal operating end selection circuit 8 receives the operation amount from the control output calculation circuit 7, the mode development calculation circuit 5, Deviation ΔA between the expansion result and the target shape
l, shape evaluation function Jl defined based on the shape influence coefficient bij for each operating end (see equation (2) described below)
The operating terminal that minimizes the shape evaluation function J is selected from a plurality of operating terminals, and is operated with the operating amount determined by the control output calculation circuit 7.

Next, the operation of the above-described embodiment device will be explained. The control output, that is, the manipulated variable Δuj of each operating end, is determined based on equation (1) in exactly the same manner as in the conventional device, so a description thereof will be omitted.

After determining the operation amount Δu1j, in this embodiment, assuming that the rolling mill has a plurality of operation ends for each shape mode, the optimal operation end selection circuit 8 performs shape evaluation defined by the following formula (2). The optimal operating end is determined using the function Jj.

Jj=X, wl・(ΔAit)ij'Δu,+)”
-(2) where i is the shape mode order for Δuj.

wl is a weighting coefficient.

Using such a shape evaluation function Jj, the shape evaluation function Jj of each operating end is multiplied by a new weighting coefficient Zj, and m1nlz
An operating end that satisfies JXJjl is found, and is operated with the operating amount Δuj using it as the optimum operating end.

In this way, according to the device of this embodiment, the optimal operating end can be selected online for each control cycle, and the optimal operating end can always be automatically selected depending on the situation. The effect of a rolling mill having an operating end, such as a 6Hi mill or a CR mill, can be fully utilized, and a highly efficient or highly accurate control effect can be obtained, and the time required for the rolled steel plate 2 to reach the target shape can be shortened. Ru.

[Effects of the Invention] As described above, according to the present invention, the optimal operating end selection means is configured to select the optimal operating end online according to the situation using a predetermined shape evaluation function.
The action of a rolling mill with multiple operating ends can be fully utilized,
The rolling shape control is performed with high efficiency and precision, and the time required to roll the rolled material into the target shape is also significantly shortened.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a shape control device for a rolling mill according to an embodiment of the present invention, and FIG. 2 is a block diagram showing a conventional shape control device for a rolling mill. In the figure, 1 - rolling mill, 2... - rolled steel plate (rolled material)
, 4-Shape meter (shape detection means), 5...Elongation rate mode expansion calculation circuit (mode expansion calculation means), 6--Target shape setting circuit, 7--Control output calculation circuit (control output calculation circuit) means), 8--optimum operating end selection circuit (optimum operating end selection means). In addition, in FIG. 1, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] In order to control the shape of the rolled material by the rolling operation of a rolling mill having a plurality of operation ends, a shape detection means for detecting the rolled shape of the rolled material, and a shape of the rolled material based on the detection result from the shape detection means. a mode expansion calculation means for expanding into a normalized orthogonal function, and a mode expansion calculation means that compares the expansion result by the mode expansion calculation means with a preset target shape, and calculates the above-mentioned shape based on the deviation and the shape influence coefficient for each operating end. In a shape control device for a rolling mill, comprising a control output calculation means for determining the operation amount of each operation end of the rolling mill, the shape control device is defined based on the operation amount from the control output calculation means, the deviation, and the shape influence coefficient. Shape control of a rolling mill, characterized in that it is equipped with an optimum operating end selection means that uses a shape evaluation function to select an operating end that can minimize the shape evaluation function from among the plurality of operating ends, and operates the operating end with the operation amount. Device.