JPS59147709A - Automatic sheet thickness controlling device of steel sheet rolling mill - Google Patents

Abstract

PURPOSE:To control a rolling material to have an uniform thickness through its longitudinal direction by separating independently driving side from driven side to control the sheet thickness in case of controlling the speed of a rolling reduction motor basing on the signals of rolling load and roll gap. CONSTITUTION:In case of rolling a rolling material by upper and lower rolls 2, respective rolling load signals of load cells 3 set separately and indenpendently to the driving side A and the driven side B and respective roll gap signals of roll gap detectors 6 set in the same manner to both sides A and B are inputted to speed signal calculators 8A, 8B to give speed controlling instructions to motor speed controllers 9A, 9B, thereby the speed controls of the sides A and B are independently performed by rolling reduction motors 10 in accordance with the speed controlling instructions. In this way, the generation of errors caused by the various kinds of conditional difference between both sides A and B is perfectly prevented.

Description

[Detailed Description of the Invention] This invention relates to an automatic plate thickness control device for a steel plate rolling mill that uses the principle of a gauge meter to control the thickness of a steel plate, which is a rolling toner, to be constant in the longitudinal direction based on the output load signal. To be more specific, the purpose is to obtain a uniform plate thickness in the width direction and length direction of the rolled material, regardless of the driving side and non-driving side G force) of the rolling roll of the rolling mill. It is something to do.

As shown in FIG. 1, the rolling mill runs a rolling material 1 such as a steel plate between a pair of rolling rolls 2, which are arranged oppositely at a set interval and driven to rotate, and passes through both rolling ports. le 2
, 2 is used to process the rolled material 1 into a product having a target size.

In order to make the thickness of the rolled material 1 constant in the longitudinal direction of the rolling mill, it is not possible to simply keep the distance between the two rolling rolls 2, 2 constant;
The distance between the two rolling rolls 2, 2 must be controlled according to changes in plate thickness, temperature, etc.

As shown in Fig. 1, an automatic plate thickness control device (■) that keeps the plate thickness constant in the longitudinal direction of the material rolled by this rolling mill is installed on each of the driving side A and the non-driving side B of the rolling roll 2. , a load cell 3 as a rolling load detector, a roll-down screw 4 that adjusts the roll interval, an opening detector 6 that detects the opening of both rolling rolls 2. A rolling motor 1O is provided which transmits force and thereby rotationally drives the rolling screw 4 to vertically displace it to change the interval between the rolling rolls 2, and the load signals from both load cells 3.3 are added by an adder 7 to perform rolling. A load signal F is obtained, this rolling load signal F and a roll opening signal S from both roll opening degree detectors 6 are input to a speed signal calculator 8, and a speed control command is output from this speed signal calculator 8. is given to the motor speed controller 9, and this motor speed controller 9 gives the motor 10, t
A configuration in which the speed and rotational direction of the rotor 0 is controlled in accordance with an input speed control command has been put into practical use in the past.

The speed signal calculator 8 in the conventional automatic plate thickness control device for a rolling mill shown in FIG. 1 operates to make the thickness of the rolled material 1 uniform using the principle of a gauge meter. As the principle is well known)! =S+/M (1) where S: roll opening, F: rolling load, M: mill elastic modulus to calculate the plate thickness H on the exit side of the rolling machine.

Now, for example, the roll opening degree SL at the timing when both rolling rolls 2.2 bite into the rolling material 1 (referred to as lock-on), rolling load F1+ to H = 5L-IFL/M
......(2) Calculate the plate thickness HL,
This is set as the target plate thickness, and the plate thickness H at each time is calculated from the roll opening signal S1 and the rolling load signal F obtained sequentially from then on. (1)
According to the formula, H=S+/M ・・・・・・・・・
(3) and by subtracting equation (2) from equation (3), ΔH=H−HL= (5−sI+)+(F−
F'')/,...(4) That is, ΔH=ΔS+61+
//M ・・・・・・・・・(5) In addition, Δ5=s
-sb, ΔF = F-FL, so that ΔH is zero, the speed control command is calculated and output as follows: ΔS = -6F/M (6) .

The motor speed controller 9 simultaneously controls the speeds of the lowering motors 1O1io on the driving side A and the non-driving side B in accordance with the speed control command from the speed signal calculator 8 described above.

In this way, the plate thickness control device in the conventional rolling mill calculates the same speed control command signal for the driving side A or the non-driving side B.
It is not possible to compensate for the difference in characteristics that occurs between the two.

Therefore, as shown in FIG. 2, for example, the mill elastic modulus M is not necessarily the same on the driving side A and the non-driving side B, but rather there is generally a difference, and as shown in FIG. roll? In order to uniform the amount of wear in the barrel direction and improve the roll consumption rate, when rolling the material 1 in the width direction away from the center in the length direction of the rolling roll 2,
This is due to the fact that the rolling loads generated on the drive side A1 and the anti-drive side B have different values, and that the temperature distribution in the width direction, the plate thickness distribution, etc. are usually not uniform due to the entrance conditions of the rolled material 1 to the rolling roll 2. There is a difference in characteristics between the driving side A and the non-driving side B of the rolling mill, but conventional plate thickness control devices perform control according to this difference in characteristics between the driving side A and the non-driving side B. was not possible.

The present invention was devised to eliminate the drawbacks of the conventional example described above, and the thickness control of the driving side A and the non-driving side B is performed completely independently, and both measuring parts are controlled with the same target value. It is configured as follows.

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

In FIG. 4, the same reference numerals as those in FIG. 1 indicate the same parts.

In Fig. 4, 8A is a speed signal calculator on the drive side A;
B is a speed signal calculator on the opposite drive side B.

Both speed signal calculators 8A and 8B are exactly the same as the conventional speed signal calculator 8 in the embodiment shown in FIG. At the same time, the roll opening signal is input only from the roll opening degree detector 6 on the driving side A, and the speed signal calculator 8B on the non-driving side B is also input only from the corresponding part on the non-driving side B. The configuration is such that a signal is input and there is no input from the opposite side.

Each speed signal calculator 8A, 8B includes a motor speed controller 9A having the same configuration as the conventional motor speed controller 9.
, 9B are connected, and each motor speed controller 9A, 9
B controls the speed of only the corresponding lowering motor IO.

That is, the automatic plate thickness control device of the present invention provides completely separate and independent control function parts on the driving side A and the non-driving side B of the rolling mill, so that the plate thickness can be controlled individually on the driving side A and the non-driving side B. It is configured to perform thickness control.

By the way, the same target value 1 (L) of the plate thickness to be controlled is input and set to both speed signal calculators 8A and 8B, but the setting of this target value HL is set in advance by the speed signal calculators 8A and 8B.
, 8B may be inputted regardless of the operation of the device, or the lock-on timing may be known from the rolling load signal from the load cell 3 and both speed signal calculators 8A, 8B may be input.
In the operation command generator 12 that issues a start signal to
A target value H1- is calculated according to the load signal at the time of lock-on from the load cell 3 on either the driving side A or the counter-driving side B, and this is calculated by both speed signal calculators 8A, 8.
It is also possible to output the start signal to B at the same time as the start signal.

In addition, 11A and 11B in FIG. 4 are amplifiers that amplify the load signal.

Also, 13 is a process computer, and this process computer 13
There are various ways to use it, but for example, as shown in Figure 3,
When rolling the rolling material 1 with deviation from the center of the rolling roll 2, the amount of deflection of the rolling roll 2 on the driving side A and the non-driving side B will naturally be different, so the deflection of the rolling roll 2 will be different. The effect of the present invention can be more effectively exerted by calculating the difference in amount in advance as a correction amount and inputting this calculated value as the correction amount to both speed signal calculators 8A and 8B.

In this way, the present invention provides a driving side A and a non-driving side B of a rolling mill.
The same automatic plate thickness control section is provided in both of them completely independently, and both automatic plate thickness control sections control the plate thickness using the same target value H.

That is, each automatic plate thickness control device on the driving side and the non-driving side B of the rolling mill operates with the roll opening degree signal S1 rolling load signal F1 mill elastic modulus M of each side.

Therefore, since plate thickness control is performed on the driving side A and the non-driving side B according to their respective mill elastic coefficients mM, there is a difference in the mill elastic modulus M between the driving side A and the non-driving side B, as shown in Fig. 2. However, it is possible to eliminate the inconvenience that the difference in the mill elastic modulus M appears as an error in the control value of the plate thickness to be controlled, and the same target value can be set for both the driving side A and the non-driving side B. On the other hand, the plate thickness is controlled independently based on the rolling load signal and roll opening signal for each side.
The occurrence of errors due to various condition differences between the driving side A and the non-driving side B of the rolling mill can be completely prevented.

In addition to the illustrated plate rolling, the present invention can also be applied, for example, to a rolling mill using multi-caliber rolls for rolling steel strips, in which the rolled material is rolled away from the center of the rolls.

As is clear from the above description, the present invention controls the driving side and non-driving side of a rolling mill toward the same target value according to signals obtained from each side. Differences in various conditions and signals from 1 do not enter into the controlled oscillation values as errors at all, and therefore the rolled material can be controlled to have a uniform thickness over its length, In addition, since each installed component can be operated without letting it play, the device is streamlined.Furthermore, the operation of (() does not require any special equipment and is almost the same as before, so it is easy to handle, etc.) It has excellent effects.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of an automatic plate thickness control device in a rolling mill. FIG. 2 is a typical characteristic curve diagram of the mill elastic modulus on the driving side and the non-driving side of the rolling mill. FIG. 3 is a layout diagram showing an example of the rolling form of a rolled material by a rolling mill. FIG. 4 shows a block diagram of the automatic plate thickness control device R according to the present invention left unused. Explanation of symbols 1; Rolling material 2; Rolling roll 3; Load cell 4: Pressure screw 5: Gear 6: Roll opening degree detector 7/adder
8.8A, 8B: Speed signal operator 9.9A, 9B
: Motor speed controller [0: Downward motor IIA,
IIB: Amplifier 12: Inventor of operation command generator
Kazu Baba Applicant Kawasaki Steel Co., Ltd. Representative Hiroshi Kibata) / A's (A) (B) 62-

Claims (1)

[Claims] A rolling load detector and a roll opening degree detector are provided separately on the driving side and non-driving side of the rolling mill, and the driving side load signal input and roll opening degree signal input are processed based on the elastic characteristics of the rolling mill driving side. A driving side plate thickness control section, a non-driving side plate thickness control section that calculates and processes the non-driving side load signal input and roll opening signal input based on the rolling machine non-driving side elastic characteristics, and each plate on the driving side and non-driving side. An automatic plate thickness control device for a steel plate rolling mill, which comprises independent rolling mechanisms on the drive side and non-drive side, which adjust the roll opening degree of the corresponding value in response to the output from the thickness control section.