JPS63256214A - Oil film compensating control device for rolling mill - Google Patents

Abstract

PURPOSE:To further accurately control the rolling thickness of a plate by obtaining a rolling acceleration and deceleration speed based on a rolling speed through a differential arithmetic unit and correcting an oil film compensating quantity based on this rolling acceleration and deceleration speed. CONSTITUTION:The signal of rolling speed S is inputted into a function generator 12 provided on a second oil film compensating device 11, and the signals of the acceleration and deceleration speed SV obtained by differentiating the rolling speed S through the differential arithmetic unit are inputted into a function generator 13. On each function generator 12, 13, the oil film compensation quantities DELTAS, DELTASV are obtained according to each value S, SV, then, the oil film thickness compensating quantity DELTASREF2 is obtained on an arithmetic unit 14. This each compensating quantity DELTASREF1, DELTASREF2 of a 1st film compensating device 7 and the 2nd oil film compensating device 11 is added by the adder 16 to obtain the oil film thickness compensating quantity DELTASREF and this quantity is inputted into a rolling reduction control device 4 as a rolling reduction operating data. In this way, the plate thickness variation of the plate 1 is effectively suppressed.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention provides an oil film compensation control device for a rolling mill that controls oil film compensation of a backup roll bearing in order to minimize variations in the thickness of a plate material to be rolled. Regarding ◎ [Prior art] Fig. 2 is a block diagram showing a conventional oil film compensation control device for a rolling mill. In the figure, 1 is a plate material to be rolled, 2 is a pair of work rolls, and 6 is a work roll. 2 is a backup roll attached to the back-up roll; 4 is a roll-down control device that controls the roll-down of the backup roll 6;

5 is a load cell that detects the rolling force Nt of the backup roll 6; 6 is a pulse generator that generates a number of pulses according to the rotational speed of the work roll 20; 7 is an oil film compensator that detects the rolling force Nt of the backup roll 6; Several rolling speeds S
It is determined by a reduction operation 1t-calculation according to , and outputs this as oil film compensation data for the backup roll bearing.

Figure 3 is a block diagram showing the internal circuit of the oil film compensator.
．． 9, and the outputs ΔS, Δjit of these function generators 8 and 9 are calculated according to a mathematical model based on fluid theory,
It consists of an arithmetic unit 10 that calculates the compensation amount ΔSREa for the oil film thickness.

Next, the operation will be explained.

When the plate material 1 is being rolled by the work rolls 2, the load cell 5 detects the rolling force Nv of the backup roll 3, and the rolling speed S.
It is detected as the number of pulses corresponding to the rotation speed of. This
Various N, S [each function generator 8, 9 of the oil film compensator 7]
is input, and here the oil film compensation amount ΔS according to various N and S
1. ΔS is obtained, and these are calculated in the calculator 10 according to a predetermined mathematical model to obtain the oil film thickness compensation amount ΔS□2
get. That is, this oil film compensation device 7 calculates ΔS□,=f(N,S) based on the rolling force S and the rolling speed N.
・Compensation calculation in (1)? As a result, all the optimal oil film compensation controls are performed and the thickness variation of the plate material 1 to be rolled is controlled. Work to minimize.

[Problem that the invention seeks to solve]

Since the conventional oil film compensation control device is configured as described above, it has good oil film compensation controllability when the rolling speed is constant, but it also has good speed followability for oil film compensation during acceleration and deceleration of rolling. There were problems such as insufficient improvement in oil film compensation control performance due to the lack of oil film compensation control performance.

This invention was made to solve the above problems.
It is an object of the present invention to provide an oil film correction control device for a rolling mill that can improve the controllability of the oil film thickness even when accelerating and decelerating a rolled material.

[A precautionary measure to solve the problem]

The oil film compensation control device for a rolling mill according to the present invention controls the rolling operation amount based on the oil film compensation amount obtained from the rolling force and rolling speed of a backup roll, and calculates rolling acceleration/deceleration from the rolling speed and performs zero differential calculation. The apparatus is equipped with a device to correct the oil film compensation amount based on the rolling acceleration/deceleration.

[Effect]

Differential calculation device in this invention! i is the rolling acceleration/deceleration by differentiating the rolling speed, and compensation outputs are obtained from each function generator according to a pattern determined by actually measuring the rolling acceleration/deceleration and the relationship between the rolling speed and the oil film thickness. Then, the oil film thickness compensation amount t obtained by adding these compensation outputs is added to the oil film thickness compensation amount obtained by the rolling speed and rolling force, thereby minimizing oil film fluctuations that occur during acceleration and deceleration. Therefore, the plate thickness changes due to oil film changes are effectively suppressed.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. 1st
In the figure, 7 and 82 have the same configuration as the first
Oil slick compensation device, 111! In the oil film compensation device @2, a function generator 12 and 13 of a pattern determined in advance by actually measuring the relationship between the oil film thickness and the rolling speed S and the rolling acceleration/deceleration S, and these The output ΔS, 1Svt of the function generator 12.15 is calculated according to a mathematical model based on fluid theory, and a calculation unit 14 calculates the compensation amount Δsamr2t'' for the oil film thickness.The output of the first oil film compensator 7 is Let the compensation amount for oil film thickness be tΔ5RIFI.15
is a differential calculation device, which differentiates the rolling speed St over time, and outputs Svt to the second oil film compensator 11 by hand.

Reference numeral 16 denotes an adder which adds the respective outputs of the first oil film compensator 7 and the second oil film compensator 11 and inputs the resulting output St to the pressure reduction control device 4.

Next, I will explain the operation. Note that the operation of the first oil film compensator 7 is opposite to that of the conventional example.

I will omit the redundant explanation here.

First, a signal of the rolling speed S is input to the second oil film compensator 11 and the nine-function generator 12 . In addition, the rolling speed St
- The signal of acceleration/deceleration Sv differentiated by the differential calculation device is input to the function generator 13 f'L. Each of these function generators 12
．． 13, oil film compensation amount ΔS, Δ according to various S, SV
svr is obtained, and the compensation amount Δ5RIF2t-of the oil film thickness is obtained in the t calculation unit 14 according to a mathematical model based on a predetermined fluid theory.

That is, if this is expressed by the t-formula.

ΔS , , = g (S , s V )
−・・・・・・(2) Δs : Δs + ΔsRB
, 2 songs/songs (3) RliP RII
Becomes FI.

Next, the respective compensation amounts ΔSamr1tΔ and 8 and 2 of the first oil film compensator 7 and the $2 oil film compensator 11 are added in the adder 16 to obtain the compensation amount Δ5R11F of the oil film thickness, and this total pressure is lowered. The data is input to the reduction control device 4 as operation amount data. Therefore, the rolling force of the backup roll 6 is controlled, and even when the rolling speed of the plate material is accelerated or decelerated, the oil film thickness is compensated for by the acceleration/deceleration.
By doing so, the thickness variation t of the plate material 1 can be suppressed more effectively.

In addition, although the above embodiment shows the detection of scraps based on the rolling speed t and the number of revolutions of the work roll 2, it may also be detected by an individual sensor based on the running speed of the plate material 1, and the same effect as in the above embodiment can be obtained. Dirty.

〔Effect of the invention〕

As described above, according to the present invention, the rolling acceleration/deceleration is calculated from the rolling speed using the differential calculation device, and based on this rolling acceleration/deceleration, the oil film compensation amount calculated from the rolling force and rolling speed of the backup roll is corrected. This has the advantage that the rolling thickness t of the plate material can be controlled with higher precision using work rolls.

[Brief explanation of drawings]

FIG. 1 shows the main parts of an oil film control device for a rolling mill according to an embodiment of the present invention. Is the block diagram shown in detail, Figure 2, the entire conventional oil slick control device? FIG. 3 is a block diagram showing an internal circuit of a conventional oil film compensator. 2 is a work role, and B is a backup role. 4 is a reduction control device, 7.11 is an oil film compensation device, and 15 is a differential calculation device. In addition, in the figures, the same reference numerals indicate the same or equivalent parts. Patent applicant Koryo Kaiki Co., Ltd. (2 others) Figure 1 Figure 2 Figure 4 Pressure control number Chichiki Figure 3

Claims (2)

[Claims] (1) Calculate the oil film compensation amount using an oil film compensation device based on the rolling force and rolling speed of the backup roll of the rolling mill,
In the oil film compensation control device of the rolling mill, which controls the reduction operation amount of the backup roll by the reduction control device based on the oil film compensation amount, a differential calculation device for calculating the rolling acceleration/deceleration from the rolling speed is provided. An oil film compensation control device for a rolling mill, characterized in that the oil film compensation amount is corrected. (2) The oil film compensation control device for a rolling mill according to claim 1, wherein the rotational speed of the work roll is used as the rolling speed.