JPS59120311A - Method for compensating speed of continuous rolling mill - Google Patents

Abstract

PURPOSE:To prevent the variation of a tension imposed on a rolling material by correcting the rolling speed of a mill in accordance with the change of backward slip of the material, etc., in performing the rolling by plural mills. CONSTITUTION:The stored values on the forward slips of rolling mills 1, 2 and the thicknesses of a rolling material at the exists of mills 1, 2, and the actual values on said items at that time, are given to an operation circuit 31 of the correcting amount of speed loop, to obtain the changing amounts of forward slips of respective mills 1, 2 and those of material thicknesses at the exists of mills, thereby the compensation amount of speed of the mill 1 is obtained. This amount of speed compensation is given, together with a speed reference from a speed reference circuit 32 of the mill 1, is given to a speed reference outputting circuit 33 to calculate a final speed reference which is given to a speed controlling device 34 of the mill 1. In this way the speed of the mill 1 is corrected, that is, the peripheral speed of mill 1 roll is corrected in accordance with the changes of the gaps between the upper and lower rolls of mills 1, 2, the changes of the thicknesses in the longitudinal direction, and the changes of forward slips, so as to prevent the variation of the tension imposed on the rolling material 4.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a device for rolling a rolled material using a plurality of rolling mills, and in particular to a continuous rolling mill that eliminates fluctuations in tension applied to the rolled material. This invention relates to a speed compensation method.

[Technical background of the invention]

Generally, when the tension applied to a rolled material that is rolled by multiple rolling mills changes, the thickness of the rolled material changes.

The plate width changes, making it impossible to obtain products of consistent quality. Therefore, in order to control the tension of the rolled material that is rolled between rolling mills, a tension control device is provided to control the constant tension side of the rolled material.

[Problems with background technology]

Naturally, in such a continuous rolling mill, when the advancing rate and backward rate of the rolled material changes, the tension applied to the rolled material between the rolling mills also changes. This tension change has the disadvantage of causing disturbance and potency to the constant tension control described above, making the constant tension control unstable.

[Purpose of the invention]

The present invention was made in order to solve the above problems, and its purpose is to make it possible to prevent fluctuations in the tension applied to a rolled material rolled by multiple rolling mills, and to continuously roll the rolled material. An object of the present invention is to provide a speed compensation method for a rolling mill.

[Summary of the invention]

In order to achieve the above object, in the present invention, when a rolled material is rolled across a plurality of rolling mills, the rolling machine It is characterized by adjusting the rolling speed of +F, l, so as not to cause fluctuations in the tension that would damage the rolled material rolled over a plurality of rolling mills.

[Embodiments of the invention]

First, the concept of the present invention will be explained in detail, but here, in order to simplify the explanation, a case of two rolling mills, one on the upstream side and one on the downstream side, will be explained. Now, if the upstream rolling mill (i-1) rolling mill and the F downstream rolling mill are considered as one rolling mill, in order to prevent the tension of the rolled material L-rolled between these rolling mills from changing. ←1 (1-1) Rolled material speed υ on the exit side of the rolling mill
(+
-1) Rolling (Kimana only needs to adjust the speed of the i rolling mill. In this case, the speed of any rolling 9HE machine can be adjusted, but in the oil 1 light of Icho, it is (+-1) The case of correcting (compensating) the speed of the rolling mill will be described.

Here, the rolled material speed τ on the exit side of the rolling mill (i-1) with no tension fluctuation and the rolled material speed v on the inlet side of the rolling mill 1-1 are equal, and each is vo+ +-
1' l + (1, + fl 1) "'"
''''(')vei−υ, (1−+−b,) ・
・・・・・・・・・・・・・・・(2)vl, (1+
11, )=t+, (14-bi)-=-(3). Here, v + + : (l], ) roll circumferential speed v of the rolling mill
, :1 Roll circumferential speed f of the rolling mill, , : (+-1) Advance rate of the rolling mill s, :t
(cooled at the backward speed of the rolling mill).

-10,000, (+-1) The change in speed of the rolled material at the exit side of the rolling mill.

1-4. l If the rolling material speed change on the entrance side of the rolling mill is Δ”el, then Δ”of-1! =iΔυ, -1(1-1(,,)+υi
−1・Δfi−1・・・・・・(4)Δυe1 ζΔυ
1(1+b, )+v,・Δb1・・・・・・・・・
... is represented by (5). Here, Δτ, : (i-1) Change amount Δv in the peripheral speed of the roll of the rolling mill
: 1 Change in peripheral speed of the roll of the rolling mill Δf,
:(1-1) Change in advance rate of rolling mill Δb : i
This is the change in the backward movement rate of the rolling mill.

Due to this collision, (+-1) the roll circumferential speed of rolling mill 1 was corrected so as not to cause tension fluctuations in the two IH materials across rolling mills and rolling mills (i-1), and (+-1) The rolling material speed variation ΔV on the exit side of the rolling mill 1 and the rolling material speed variation Δτ· of the 1-rolling 1-1 intrusion law may be made to match. That is, Δv, (1+f1 1 )+vi-1'Δf, -1
-1 = Δυ, (1+b,) 1υiΔb1 ・・・・・・
...(6)5- Therefore, (1-1) Roll circumferential speed correction of rolling mill Δvi-
1 becomes.

Here, by substituting equation (3) into equation (7), we get (1-1,
) The rolling mill speed correction (compensation) Hayabusa is expressed as .

Therefore, if the circumferential speed of the rolls of the 1i-1) rolling mill is changed as determined from equation (8), the tension variation in the rolled material across the EE rolling mill and one rolling mill will occur. stomach. In equation (8), the advancing rate and the backward rate are determined by a device such as a menoyaring roll on the entrance or exit side of each rolling mill that detects the rolling material speed 1u-; The speed of the rolled material can be determined by detecting the speed of the rolled material using a device that detects the speed of the rolled material using the Doppler effect of laser, sound, etc., and comparing the speed with the circumferential speed of the roll of the rolling mill.

However, since the amount of change in the advance rate is generally smaller than the amount of change in the backward rate of the rolling mill, the simple method is
It is also possible to omit the ratio term with 1-, and to change formula (8) to the following, l: sea urchin criterion 1.

IF, in the book? ,! Tt Iso no Hito 11
11 mass flow is U,, out (mass flow of 111+ is υ
. , 7 Then, part 1 Each is equal according to the mass flow conservation law, and each is IJ-B・■(l-vi・(1+b1)...
・・・・・・(101 IJol−B−111・υ, (1,+f−) ・・
・・・・・・・・・-t, +1)H, (1+b,)=h
, (1+f,) ......021. In addition, B: Width of the rolled material H: 1 of the rolled material on the input side of the rolling mill h, : i indicates the thickness of the rolled material on the exit side of the rolling mill.

On the other hand, the change in mass flow on the inlet side of the i rolling mill is ΔU,
Let the change in mass flow in Equation 101 be ΔTJo, then each is equal according to the mass flow conservation law, and Uel+ΔUe1=B−(H,+ΔH,)(v, +Δυ
1) (1,+bl+Δb,)・・・・・・・・・
・(11 U, +ΔU =B-(h1+Δh,)(11
, +Δv,) (1, -+-f, ten Δf,) lol ......0 → (H, +ΔH,) (1+b, tΔb,) = (h, ten ΔJ
)(1+f, 1Δf,)......(19)

Here, by substituting the O2 equation into the equation 19, it is expressed as.

Furthermore, by substituting equation (11) into equation (8), equation (8) can also be expressed as q.

Therefore, if the circumferential speed of the roll of the (+-1) rolling mill is changed as determined from the equation 0, the tension of the rolled material across the (+-1) rolling mill and one rolling mill will not vary.

[7 However, in general) When comparing the amount of change in the thickness of the rolled material on the exit side, the amount of change in the advance rate is small in I ~, so a simple method is to omit the term for the advance rate ■ -, (1η large can also be controlled by 6 marks as shown in the following formula.

Therefore, if the circumferential speed of the rolls of the rolling mill is changed by (+-1) as determined from the pedestal thickness, the tension of the rolled material across the rolling mill and lVE rolling surface (i-1) will not fluctuate. (1) In the force equation and 0→ equation, the plate thickness of the rolled material at the outlet of the rolling mill is the rolling load P of the rolling mill, the gap S between the upper and lower rolls, the rigidity coefficient (mill constant) M of the rolling mill, h = s −＋−１ ・・・・・・・・・・・・
...Determined by 0 scratches. Therefore, if we detect the rolling property of l rolling 10Q2, 1πP, ) the gap S between the upper and lower rolls, we can calculate the thickness of the rolled material from each 9-rolling mill, and the rigidity coefficient of the rolling turret as M. Then, it becomes . In addition, the amount of change in the thickness of the rolled material at the exit side of the rolling mill is Δ
When h1 is assumed, it becomes. Therefore, from equation α) and equation 4)1), the thickness change amount Δh of the rolled material on the exit side of the rolling mill can be detected as follows. Therefore, formula 07) is...
・・・・・・・・・(c) Also, the 0 → formula can be expressed as =10−. Also, the θ force formula, 0 (to) person 1
1v change amount ΔFr, B, (+
-1) Either transfer the j-thickness variation Δhi-+ of the rolled material on the exit side of the rolling mill, or transfer it to the middle of the (1-1,) L rolling mill and the 1st rolling mill (<y, -1 and transfer the detected value Z).

Hereinafter, a specific example of the configuration of the present invention based on the idea as described in L will be described with reference to the drawings. FIG. 1 shows an embodiment of the speed compensation method expressed by equation 07). In the figure, (1-1,) rolling mill z and i rolling mill 2 are driven by drive motors 5 and 6, respectively (Z). Roll circumferential speed v, , v, b of each rolling mill 1.2, respectively 1-1 1 Roll circumferential speed From the detection circuit 9.10 and the roll diameter of each rolling mill 1, 2, the roll circumferential speed range, V, is determined.

]-11 '+, output 11 of each rolling mill 1, 2]j rolling material speed V.

1-1°τ. , signals from rolled material speed detectors 11 and 12 provided near the exit side of each rolling mill 1 and 2 are applied to rolled material speed detection circuits 13 and 14 for detection.

Further, the roll circumferential speeds IJi-1 and vi of each rolling mill 1 and 2 detected by the roll circumferential speed detection circuits 9 and 1θ, and the exit side rolled material speed υ detected by the rolled material speed detection circuits 13 and 14.

i-1, τ0. 1 bar+-) are sent to the advanced rate calculation circuits 15 and 16, respectively, and the advanced rates are calculated by the following Iz'i and cn formulas.

On the other hand, each rolling P & 2, 2 rolling loads P, , P, &
:i, 1-1 1 Load detection installed on each rolling mill 1, 2 17゜18
The signal is detected by the elongation detection circuit 19 of the rolling mill.
．． 20, and the rolling loads P and P at that time are applied to
The rolling mill elongation Pi-1/Mi
-1'P, /M is found. In addition, each rolling mill 1, 2
The signals detected by the position detectors 21 and 22 attached to the rolling mills 1 and 2 are sent to the position detection circuits 23 and 24, and
The gaps 5i-1 and Sl between the upper and lower rolls are detected.

The rolling mill elongation P, , /M, -1,l), /M detected by the rolling mill elongation detection circuit 19.20 and each rolling mill 1 detected by the position detection circuit 23.24. The gaps 5l-11SI between the upper and lower rolls of each rolling mill 1.2 are given to the output side rolled material thickness calculation circuits 25.26, respectively, and the thickness hl- 1r
hi is required. On the other hand, switches SWI and SW2
.

SW3, 1 in SWJ: After the tip of the rolled material is bitten into the i rolling mill 2 - it closes all at once, and the advance rate of each rolling mill 1 and 2 at that time is 1 +fl-+, 1 + f, and the exit side rolled material The thicknesses, , h, are stored in the memory circuits 27, 28, 29° 1-1 1 30. When this memorization is completed, switches SW2, SW2, SW3, and SWJ are opened all at once again. In addition, the speed loop correction amount calculation circuit 31
Here, the lead rate of each rolling mill 1.2 between this stored value and the actual value at that time is 1+f, , *1+f.

and the thickness hl-1, hl of the exit side rolled material, and the amount of change Δf11+Δf in the advance rate of each rolling mill 1, 2 is determined from the difference between the stored value and the actual value at that time.

and the amount of change Δh in the thickness of the rolled material on the exit side, Δh is 1-
1 I i 13- is obtained, and from this, the 0θ formula is calculated to obtain (1-
1) The speed compensation amount of rolling mill 1: Δ"I-1/vl-1 is calculated. This (i-1,) speed compensation amount of rolling mill 1 Δcho-1/vl-1 is (1- 1) (1-1') from the speed reference circuit 32 of the rolling mill 1 with (i-t) given to the 1-1 speed reference output circuit 33 of the rolling mill 1; The formula is calculated, and the result is given to the speed control device 34 of the (1-1) rolling mill 1 as the final speed standard, and as a result, (1-1
) Correct (compensate) the speed of rolling mill 1. This results in (
1-],) Rolling Mill 2.1 Rolling Mill 2.1 Rolling Mill Corrected the roll peripheral speed of 1 (
(i-1) It is possible to prevent fluctuations in the tension applied to the rolled material 4 across the rolling mills 1 and 1 rolling mill 2.

14- Above 1. According to the rolling mill speed compensation method according to this embodiment, the thickness change in the direction of the length Ji of the rolled material, that is, the backward movement rate change, determined from the rolling mill h, the lower roll gap change, and the rolling load change, The rolling speed of the rolling mill can be adjusted according to the change in the advance rate, so that even if such a change occurs, the tension of the rolled material across the first rolling mill will not change. I can do it.

Next, FIG. 2 shows an embodiment of the speed compensation method shown by the above-mentioned 0→formula, that is, rolling speed detectors 71, 12 are selected from among the components of the embodiment shown in FIG.
, rotating dust detector 7°8, roll rotation detector 9, 10
．． Rolled material speed detection circuits 13, 14, advanced rate calculation circuit 15
, 16, memory circuit 27.2B, and switch SWI
.

SW,? is deleted.

This example is a simple method that removes the detection of advanced rate changes from the example of FIG. 1, and is the same as the example of FIG. 1 except that the detection of advanced rate changes is deleted. The explanation will be omitted here. According to the rolling mill speed compensation method of this embodiment, the rolling mill speed is adjusted according to the change in the thickness in the longitudinal direction of the rolled material, that is, the change in the backward movement rate, determined from the change in the gap between the upper and lower rolls of the rolling mill and the change in the FF rolling cart. The rolling speed can be modified and the same effect as described in 1itI can be obtained.

In addition, in section -F, an example was shown in which the change in the backward rate is determined from the change in the thickness of the rolled material in the good direction. ) A device that detects the speed of the covering material, etc.'! j: It is determined by detecting the speed of the rolled material using a device that detects the speed of the rolled material using a Donner effect such as a laser or sound, and comparing this with the roll circumferential speed of the IL rolled material. [Effects of the Invention] As explained above, according to the present invention, the speed compensation method shown by the above equation (8) is applied. Since the rolling speed of the mill is modified, even if such a change occurs, it will cause fluctuations in the tension applied to the rolled material across the rolling mills with 1" number of stages. It is possible to provide an extremely reliable and efficient method for rolling mills that can be used to avoid problems.

[Brief explanation of drawings]

FIG. 1 and FIG. 2 are block diagrams showing one embodiment and another embodiment of the present invention, respectively. 1.2...Rolling mill, 4...Rolled material, 5, 6...Rolling machine λ transverse electrical support 1) How many? , 8... Rotation speed detector, 9.1θ... Roll circumferential speed detection circuit, 11.12...
・Rolling 1Blp degree detector, 13.14...Rolled material speed detection circuit, 15.16...Advanced rate calculation circuit, 17゜1
8...Load detector, 19.20...Rolling mill 1+13
and detection circuit, 21.22... digit detector, 23°24
. . . Detection circuit for position 1", 25. 26 . . . Output side rolled material thickness calculation circuit, 27 , 28 , 29 , 30 . . .
Memory circuit, 31...i4j IQ "roots abstraction" d
Arithmetic circuit, 32... Speed reference circuit, 33... Speed jW
Reference output circuit 1.94- ffi degree fl+ll fi
11 devices, SWI, SW2. SW3,5W4-7. stomach,
, f. −37=

Claims (1)

[Claims] (]) When rolling a rolled material across a plurality of rolling mills, the rolling speed of the rolling mill is corrected in accordance with a change in the backward movement rate of the rolled material. Characteristic speed compensation method for continuous rolling mills. (2) A speed compensation method for a continuous rolling mill as set forth in claim (1), characterized in that the rolling speed is corrected in accordance with changes in the thickness of the rolled material in the longitudinal direction. (3) A speed compensation method for a continuous rolling mill, characterized in that the rolling speed of the rolling mill is corrected in accordance with changes in the backward rate and advance rate of the rolled material. (4) According to claim (3), the rolling speed of the rolling mill is corrected in accordance with changes in the plate thickness in the length direction of the rolled material and changes in the advance rate. Speed compensation method for continuous rolling mill. 1-