JPS62197212A - Device and method for controlling carrier table roller seed in hot rolling - Google Patents

Abstract

PURPOSE:To realize the correct speed control of a carrier roller by correcting an advance rate estimation model equation by using the advance rate re- arithmetic operation vale amended by arithmetic operation from an observed advance rate and observed parameter value and by performing the speed control by using the estimation value adding the correction. CONSTITUTION:The advance rate is found by the advance rate estimation model equation by integrating the pulse number generated from the pulse generator 5 of a driving motor 4 while the tip of a rolled stock 1 is passed through the space between the tip position detecting devices 6, 7 at the rolling roll 2 outlet side, in the 1st stage. In the 2nd stage an advance rate re-arithmetic operation value is found with the re-arithmetical operation by using the observed value for the variable which is used for the arithmetic equation finding the advance rate. The speed of the rolled stock 1 at the roll 2 inlet side and outlet side is estimated by correcting the advance rate estimation model equation by the value obtd. at the 1st and 2nd stages, in the 3rd stage. A carrier table roller 3 is subjected to a speed control by setting to this estimation value. In this way the correct speed control of the carrier table roller can be performed.

Description

Detailed Description of the Invention a. Field of Industrial Application The present invention relates to a device and method for controlling the speed of a conveying roller in hot rolling, and in particular, even when the tip shape of a hot rolled material changes, The present invention relates to a novel device and method for constantly matching the speeds of material and transport table rollers.

b. Conventional technology The speed adjustment between the hot rolled material and the conveying table roller during horizontal mill rolling in the conventionally used hot rolling mill is carried out using the advanced rate prediction model formula (1 formula) shown below. is common, f = F, (H, h, R')...
(1) Equation H: h: Output side plate thickness R111 Flat roll diameter The conveyance table roller speed is controlled by the value calculated by the formula (1), thereby adjusting the speed of the hot rolled material and the conveyance table roller. was going on.

C5 Problems to be Solved by the Invention Since the conventional method of controlling the conveyance roller speed in hot rolling is configured as described above, the value of the calculated advance rate may be a value different from the actual value. I could only calculate it.

That is, although the advance rate generally changes depending on the roll surface condition due to hot rolling material, roll material, rolling process, hot rolling oil, and roll coolant pressure, correction values for the above-mentioned variable factors are added. Therefore, it was not possible to always match and synchronize the speeds of the hot-rolled material and the transport table rollers.

Therefore, in the conventional control method described above, there is a problem in that a slipping phenomenon occurs between the hot rolled material and the conveying table roller, resulting in poor quality on the back side of the hot rolled material. .

In addition, conventionally, a method of controlling the rolling mill using a load cell has been proposed as a method of measuring the leading edge ratio, but this method takes into account changes in the tip shape of the rolled material that occur during the hot rolling process. Therefore, there was a problem in that measurement errors were unavoidable.

The present invention quickly eliminates the above-mentioned problems, and improves hot rolling in which the speed of the hot rolled material and the conveyance table roller can always be adjusted even if the tip shape of the hot rolled material changes. An object of the present invention is to provide an apparatus and method for controlling the speed of a conveyor table roller in a conveyor table roller.

d. Means for Solving the Problems The conveying table roller speed control device for hot rolling according to the present invention is a device for controlling conveying table rollers on the entrance and exit sides of a rolling mill in hot rolling. a rolling mill drive motor for driving the rolling mill drive motor; a pulse generator disposed on the rolling mill drive motor for generating pulses in accordance with the rotation of the rolling mill drive motor; and a pulse generator disposed on the outlet side of the rolling roll for driving the rolled material a pair of first and second tip position detection devices arranged at a predetermined interval to measure the tip position of the tip, and a setting calculation section for inputting outputs from the tip position detection devices and the pulse generator. and a conveyance table roller speed control section for controlling the speed of the conveyance table roller based on the output from the setting calculation section.

In addition, another invention of the present invention, which is a method for controlling the speed of a conveying table roller in hot rolling, is based on the distance between a plurality of rolled material tip position detection devices installed on the exit side of a rolling machine, and the distance between these rolled material tip position detection devices. A first step of determining an advancement rate based on the number of pulse oscillations generated from a pulse generator provided in a rolling mill drive motor while the rolled material passes between the material tip position detection devices, and an arithmetic formula for determining the advancement rate. A second step in which the variables used are recalculated using the actual measured values to obtain the advanced rate recalculation value, and the advanced rate prediction model formula is corrected based on the values obtained in the first and second steps, and the rolling This method includes a third step of predicting the rolling material speed on the machine input side and the machine exit side, and the conveying table roller speed is controlled based on the predicted value obtained in the third step.

80 Effects In the conveyance table roller speed control device and method in hot rolling according to the present invention, the rolled material is transferred from the first rolled material tip position detection device provided on the outlet side of the hot rolling machine to the second rolled material tip position detection device.
Integrate the number of pulse oscillations of the pulse generator installed in the rolling mill drive motor until reaching the rolled material tip position detection device, calculate the actual advance rate using the formula fM = L / (n - f) - 1, and further , the advanced rate recalculation value is obtained based on the actually measured parameter value, and the advanced rate prediction model formula is adaptively corrected using the aforementioned advanced rate fM (!: recalculated value f0M. Next, the advanced rate prediction model formula is modified with this adaptive correction taken into account. value and (1〒ε)H2(1
+f) The plate speed on the entry side of the hot rolling mill is predicted based on the backward rate determined by the h formula, and if the hot rolling mill work roll speed is VROLL, the plate speed on the entering side of the hot rolling machine is Vs:a = ( 1-ε) VROLL and hot rolling machine outlet plate speed are determined by Vsf = (1+f) VROLL, and by using these predicted values VSB and VSf, the conveyance table roller speed that matches the plate speed can be determined. I can do it.

f. Embodiments Hereinafter, preferred embodiments of the apparatus and method for controlling the conveying table roller speed in hot rolling according to the present invention will be described in detail with reference to the drawings.

The configuration shown in FIG. 1 shows a conveyance table roller speed control device in hot rolling according to the present invention.
This is a hot-rolled material rolled and extended by a hot-rolled material 1, and a number of conveyance table rollers 3 are in contact with the lower surface of the hot-rolled material 1, and this hot-rolled material 1 is conveyed by each conveyance table roller 3. Ru.

The pair of rolling rolls 2 are driven by a rolling mill and a drive motor 4 at a predetermined rotational speed, and a rotary pulse generator 5 is attached to a rotating shaft 4a of the rolling mill drive motor 4.

A predetermined interval (L) is provided on the exit side (A) of the rolling roll 2.
First and second tip position detecting devices 6 and 7 are arranged at
This detects the position through which the leading end of the hot rolled material 1 sent out from the rolling roll 2 passes, and is configured to be able to perform highly accurate position detection using a laser or the like.

The outputs of the pulse generator 5 and the first and second tip position detecting devices 6 and 7 are input to a setting calculating section 8 which has a built-in computer, and the output from this setting calculating section 8 is sent to a conveying table roller speed controlling section 9. The configuration is such that the conveyance speed of the conveyance table roller B is controlled by the output of the conveyance table control section 9.

The calculation function in the setting calculation section 8 is as shown in FIG.
The advanced rate recalculation value is calculated in the step, the adaptive correction amount is calculated in the third step, the plate speed prediction is calculated in the fourth step, the conveying table roller speed command value is calculated in the fifth step, and the conveying table roller controller 9 is sent in the sixth step. It is possible to output speed command values respectively, and in Fig. 2, n indicates the hot rolled material for which the adaptive correction amount was determined based on the actual measurement value, and n
+1 indicates a hot-rolled material to be controlled by predictive calculation using the result of n. VROLL is the work roll speed of this hot rolling mill, ①Sf is the speed of the hot rolled material at the exit side of the hot rolling mill, and VSB is the speed of the hot rolled material at the entrance side of the hot rolling mill.

The conveyance roller speed control device and method in hot rolling according to the present invention are configured as described above, and are as follows:
A case in which the speed of the conveyance roller is actually controlled will be explained.

The actual advance rate (fM) is calculated by integrating the number n of pulse oscillations of the pulse generator 5 from when the tip of the hot rolled material 1 passes through the first tip position detection device 6 until it reaches the second tip position detection device 7. can be determined by the following equation (2).

fM= L/(n-L)-1...(2) Formula 1 % L: Distance between the tip position detection devices 6 and 7 n: Distance between the tip position detection devices 6 and 7 Rolling work roll arc length in pulse oscillation with pulse oscillation number 1:1 On the other hand, since the advance rate prediction model formula is composed of the parameters shown in equation (1) above, here, this advance rate prediction is determined by the actually measured parameter values. The model equation is recalculated, and this recalculated value (foM) can be expressed by equation (6). Here, the plate thickness is the actually measured plate thickness using a gauge meter, and the flat roll radius is the actually measured flat roll radius using the Hitchcock equation.

fCM == F, (HM, hM, R'M
) ...(6) Equation 1 % R": Actual measured value of flat roll radius Next, the advanced rate prediction model formula is adaptively corrected using the actually measured advanced rate fM and the recalculated value fCM from the actually measured parameter values. I do.

As a method for this adaptive correction, a smoothing method shown by the following equations (4) to (6) is mainly used.

f=F+(H,h,R')10△c! n++ ・−(
4) Formula Δ(1'n+4-α・△Cn+(12)”△an
−(5) Formula △C notification== f M (CM
...(6) Equation f: Advanced rate predicted value H Two-man side plate thickness h: Output side plate thickness R1: Flat roll radius △cn++: Adaptive correction amount for the next rolled material △Cn a
Adaptive correction amount fM used in rolling this time: Actual advancement rate f0M = Advancement rate recalculation value based on actually measured parameter value α: Adaptive correction constant Next, the prediction of the plate speed on the entry side of the hot rolling machine is as described in (4) above. It is determined by the forward rate predicted value (f) that takes into account the adaptive correction shown in the equation and the backward rate that can be uniquely determined by the following equation (7).

(1-ε)・H in 1(1+f)・h ... (7) Formula H : : : By using the above results, if the speed of the rolling roll 2 of the hot rolling mill is VROLL, then the hot rolling The rolling mill entrance plate speed VSB and the hot rolling machine exit plate speed VSf are as follows (8
) and (9).

VSB: (1-ε) VROLLL...
By using VSB and VSf, which are speed prediction values of formula (8), it is possible to determine the speed of the conveying table roller B that matches the plate speed of the rolled material.

FIG. 3 is a characteristic diagram showing the effect when the above-described conveyance roller speed control device and method in hot rolling according to the present invention is implemented in a rough rolling mill of a hot rolling system, and is This shows the control effect of

In the figure, the curves indicated by symbols ■ and ■ indicate the ratio of the conveying table roller to the hot rolled material, and the curve indicated by the symbol ■ indicates the ratio of the predicted hot rolled material and the measured table roller when the present invention is not applied. , the curve indicated by the symbol ■ shows the ratio between the predicted hot rolled material and the measured table roller when the present invention is applied.

In addition, in the figure, the section indicated by A is the part where the operator changed the amount of rolling oil, and VR is the section indicated by the conveyance table roller 3.
, VS is the plate speed of the hot rolled material 1.

Therefore, it is clear from the characteristics after application of the present invention shown in Fig. 6 that the curves ■ and ■ follow extremely closely, and the speed of the hot-rolled material and the speed of the conveying table are adapted very well. This makes it possible to eliminate the quality defects that occur on the back surface of the hot-rolled material 1.

g0 Effects of the Invention The apparatus and method for controlling the conveying roller speed in hot rolling according to the present invention have the above-described structure and function, and therefore can extremely accurately match the plate speed of the rolled material. The speed of the conveyance table roller can be determined, and quality defects that occur on the back surface of hot-rolled material due to speed deviation can be quickly removed.

[Brief explanation of drawings]

The drawings are for illustrating the conveyance roller speed control device and method in hot rolling according to the present invention. FIG. 1 is a schematic diagram showing the overall configuration of the device, and FIG. 2 shows the setting calculation section in FIG. 1. FIG. 3 is a process diagram showing the arithmetic function of the present invention, and FIG. 3 is a characteristic diagram showing the state before and after the present invention is applied. 1 is a rolled material, 2 is a rolling roll, 3 is a conveyance table roller, 4 is a rolling mill drive motor, 5 is a pulse generator, 6
7 is a tip position detection device, 8 is a setting calculation section, and 9 is a conveyance table roller speed control section. Patent applicant: Nisshin Steel Co., Ltd. Figure 3 Number of rolled heathers (honguchi) Procedural amendment (voluntary) April 14, 1985

Claims (4)

[Claims] (1) A device for controlling conveyance table rollers on the inlet and outlet sides of a rolling mill for hot rolling, including a rolling mill drive motor for driving the rolling rolls, and a rolling mill drive motor provided in the rolling mill drive motor. a pulse generator that generates pulses according to the rotation of the rolling material; and a pair of first and second pulse generators that are arranged on the exit side of the rolling roll and spaced apart from each other by a predetermined distance in order to measure the tip position of the rolled material. a tip position detection device, a setting calculating section for inputting outputs from each of the tip position detecting devices and the pulse generator, and a conveying table roller for controlling the speed of the conveying table roller based on the output from the setting calculating section. A conveyance table roller speed control device for hot rolling comprising a speed control section. (2) In a method for controlling the conveyance table roller speeds on the entrance and exit sides of a hot rolling mill, the distance between a plurality of rolled material tip position detection devices installed on the exit side of the rolling mill and the distance between these rolling material tip position detection devices are determined. A first step of determining an advancement rate based on the number of pulse oscillations generated from a pulse generator provided in a rolling mill drive motor while the rolled material passes between the material tip position detection devices; and a calculation formula for determining the advancement rate. A second step in which the variables used are recalculated using the actual measured values to obtain the advanced rate recalculation value, and the advanced rate prediction model formula is corrected based on the values obtained in the first and second steps, and the rolling and a third step of predicting the speed of the rolled material on the input side and exit side of the machine, and the conveying table roller speed is controlled based on the predicted value obtained in the third step. A method for controlling the speed of conveyor table rollers. (3) The advancement rate in the first step is f^M=L/(n・l)-1 [However, f^M: Actual advancement rate L: Distance between rolled material tip position detection devices n: 〃Number of pulse oscillations during passing l: Arc length of the rolling work roll in one pulse oscillation] The advanced rate recalculation value in the second step is f^C^M=F_1(H^M, h^M, R' ^M) [However, f^C^M: Advanced rate recalculation value H^M: Actual measurement value of inlet plate thickness h^M: Actual measurement value of outlet plate thickness R'^M: Actual measurement value of flat roll radius] A conveyance table roller speed control method in hot rolling according to claim 2, characterized in that: (4) In the third step, the advanced rate f^M and the recalculated value f
By ^C^M, f=F_1(H, h, R')+ΔC_n_+_1...(
A) Formula ΔC_n_+_1=α・ΔC^i_n+(1-2
)・ΔC^u_n…(B) Formula ΔC^i_n=f^M−f
＾C＾M……(C) Formula f: Advanced rate predicted value H: Inlet side plate thickness h: Outlet side plate thickness R′: Flat roll radius ΔC_n_+_1: Adaptive correction amount Δc^ for the next rolled material
i_n: Adaptive correction amount used for rolling this time f^M: Actual advancement rate f^C^M: Advancement rate recalculation value α based on actually measured parameter values
: A process of adaptively correcting the advanced rate prediction model formula by a smoothing method using an adaptive correction constant, and calculating the advanced rate predicted value (f) taking into account the adaptive correction shown by the above formula (A) and the following (D). A process of predicting the strip speed on the entry side of the hot rolling mill using the formula, ε: Reverse rate Next, V_S_B=(1-ε)V_R_O_L_LV_
S_f=(1+f)V_R_O_L_LV_S_B: Hot rolling machine entrance plate speed V_S_f: Hot rolling machine exit plate speed V_R_O_L_L: Find V_S_B and V_S_f from the rolling roll speed, and calculate this V_S
A conveyance table roller in hot rolling according to claim 2 or 3, characterized in that the conveyance table roller comprises the step of determining the speed of the conveyance table roller in accordance with the plate speed of the rolled material by _B and V_S_f. Speed control method.