JPS59163008A - Control device of rolling mill - Google Patents

Abstract

PURPOSE:To provide a control device of a rolling mill which restrains the increase of off-gauge caused by the variation of tension by seizing the position of coil front end through a pulse signal and controlling a rolling reduction by using controlling data converted into a model and providing a means for correcting the controlling data basing on the deviation of sheet thickness. CONSTITUTION:The front end positon of a coil 3 is seized to estimate the timing of biting the coil 3 by rolls 2, by measuring the pulse outputted from a pulse oscillator 4 attached to a roll 1 with the aid of a pulse tracing device 5. When recognized that the front end of coil 3 advances by a distance (l), a control device 6 controls a rolling reduction controller 8 by using controlling data 7 converted into a model. Then the pulses outputted from pulse oscillator 4, 9 are measured again by the device 5 to trace the position of coil 3 till it arrives at a sheet thickness detector 10. The deviation of sheet thickness of a part to be controlled of the coil 3 is detected by the detector 10 to give the results to a learning device 11, thereby correcting the model of the controlling data after inspecting the controlled results.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention relates to a cold rolling mill (2) in which rapid tension fluctuations ( Second Plate - Rolling mill control device for correcting thickness variations (-).

Technical Background of the Invention and Its Problems In the rolling of metal sheets, especially in cold rolling mills, the mainstream method is to roll each dill individually. The amount of off-gauge at the time is large, and the tension applied to the coil changes suddenly (2) at the timing of each stand's engagement and exit timing (-), which results in a larger off-gauge.
When the stand is caught in, there is a transition from a tension-free state to a tensioned state (a two-dimensional change), and when the stand is removed, the opposite state transition (= change is considered). This variation is nonlinear, and therefore Control was impossible with a controller and a replacement type (digital) controller for analog control systems.

Purpose of the Invention The present invention takes into account the above-mentioned circumstances (two factors), and the present invention solves the problem of tension vibrations (two) at the biting timing of each stand during sheet passing in a cold rolling mill (two) and the timing of each stand slipping out during ash removal (two). It is an object of the present invention to provide a control device for a rolling mill that can suppress an increase in off-gauge due to

Summary of the Invention The object of the present invention is to provide a pulse transmitter provided in each stand, a tracking device that measures the pulses from the pulse transmitter and predicts the timing of coil engagement or tail removal in each stand, and There is a control device that controls the reduction of each stand using modeled control data, which is preset timing given by the tracking device, and a control device that adjusts the actual reduction position of each stand. a rolling stand exit side (a plate thickness detection device that detects a plate thickness deviation of a coil that has been bifurcated and rolled), and a learning device that verifies the detected deviation and corrects the control data. This is achieved by a rolling mill control device that

Examples of the invention An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic configuration diagram showing the configuration of the present invention. The coil 3 being rolled by roll 1 (hereinafter referred to as Noi stand) of the cold rolling mill is transferred to the next roll 2 (hereinafter referred to as Noi stand).
+1) In order to predict the timing at which the coil will be bitten by the Noi stand (referred to as a stand), the pulse from the pulse transmitter 4 attached to the Noi stand (1) is measured by the tracking device 5, and the position of the tip of the coil is determined.

When it recognizes that the tip has advanced l from the Noi stand, it informs the control device 6 of this fact. The control device 6 controls the reduction controller 8 using modeled control data 7 given in advance. The position on the coil controlled by this 16 is measured by the tracking device 5 again by measuring the pulses transmitted from the pulse transmitter 4.9, and is tracked by the plate thickness detector 10-1:. This plate thickness detector 10 detects the plate thickness deviation of the controlled portion on the coil, and provides this to the learning device 2 to verify the control results.

If there is an excess or deficiency in the control amount, the modeled control data 7 is corrected by this learning device 11i.

Incidentally, the timing of arrival at the No.
The purpose of this is to start control immediately before the bite timing. No. (i+1) stand (with two or more load relays 12 attached), it is possible to determine the timing of the jamming, but the start of control is delayed, which is undesirable. For example, even if the load relay 12 is turned on, if the tracking by the pulse has not progressed by l, the control is stopped.(It goes without saying that 1 is used.

Effects of the Invention (2) The application method of the device of the present invention is explained in Fig. 2 (2). Fig. 2 (1) detects the thickness of a coil rolled in a cold rolling mill, The part indicated by ■ in the figure is the off-gauge amount that occurs when the stand is caught.In order to correct this (2. In other words, at the timing when the No. (i+1) stand engages, the downward position of the No. stand is controlled.As shown in Figure 2 (2), the controlled amount is a model that only cancels the off-gauge amount. Provide the converted data in advance.Generally, if the off-gauge part is △hc dragon],
The amount of reduction ΔS that should be calculated is ΔS from the formula of the rolling mill.
-] Ryomachi・△h (where M: Mill constant [:TONβm]
, m: given by the plasticity coefficient of the coil (TON/m?lL,l).

This jf5f controlled position on the coil is the plate thickness adjuster 1.
When the plate thickness deviation reaches 0 (2), as shown in Figure 3 (3) (2), if the plate thickness deviation is detected by 2Δh', the control amount is insufficient.
4J 1i9r released. Like this Ciii! J @ If the amount is too much or too little, the learning device 11 corrects the amount control data 7. The values to be corrected are △t - M+ m, Δh', and therefore the control amount to be used next time is ΔS + △S'. However, if the error included in the measurement data is taken into account, the above-mentioned Δ
Since it is not preferable to use S' to that extent, it is recommended to introduce a reduction coefficient k (0<k<1) and use k・△S' as l correction amount, or to average (Σ" 9h) Set the value as the correction amount.

Shiributsu is a function of time.
Noi = No (i+1) for removing ash from the oi stand.
Because the tension between the stands changes from tension to non-tension (two transitions)
2. An off-gauge amount occurs, but in order to compensate for this off-gauge amount, the timing for removing ash from the bottom of the stand is predicted by the tracking device 5 (2), and this is communicated to the control device 6.tj
The ilJ control device 6 uses the pre-given control data 7 to control the oppression # machine of the No (i-H) stand, although it is not shown in the figure, No (i+1
) The stand is also supplied with a control command from the control device 6 to correct the off-gauge amount. The corrected position on the coil is the same as when passing the sheet (= sheet thickness detector 10
The deviation detected by the plate thickness detector IO is verified by the learning device 11, and if there is an excess or deficiency, the control data 7 is corrected to become optimal control data.

Effects of the Invention As stated above (;, non-invention (-), it is possible to reduce the off-gauge amount in the cold rolling mill (2) by threading and bottom removal, and it is possible to reduce the amount of off-gauge in the cold rolling mill (2). I can do it.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a diagram illustrating details of the invention. 1.2...Roll of cold rolling mill, 7...Control data 3...Coil, 8...Reduction control machine 4.9...Roll (Double number 9 is added 10...
Plate thickness detector pulse transmitter, 5... Coil tracking device, 11... Learning device 6
...Control device, 12...Load relay (7317) Agent Patent attorney Nori Chika Kan 1 (Q
(7511 people) Figure 1 Figure 2

Claims (1)

[Claims] A pulse transmitter installed in each stand, a tracking device that measures the pulses from this pulse transmitter and predicts the timing of coil biting or ash removal in each stand, and a timing given from this tracking device (two There is also a control device that controls the pressure of each stand using modeled control data set in advance;
A rolling machine equipped with an LJ control machine, a plate thickness detection device that detects a plate thickness deviation of a rolled coil provided at a rolling stand, and a learning device that corrects the control data by verifying the detected deviation. Machine control device.