JPS58202912A - Automatic flow rate controlling device of coolant valve in foil rolling mill - Google Patents

Abstract

PURPOSE:To correct the local strain of a material to be rolled, by making the set value of the flow rate of coolant oil shunting from respective valves branched at a roll part coincident with the whole flow rate of the coolant calculated basing on the detected value of a shape in the width direction of the material. CONSTITUTION:A shape signal S1 outputted from a shape detector 3 of a material to be rolled is fed to a necessary flow rate calculating means 5 through an input interface circuit 4 to calculate a necessary coolant flow rat V1 thereby inputting the flow rate V1 to an arithmetic device 6a. Next, the device 6a sets the flow rate of the coolant injecting from respective valves 10-1-10-N so that it coincides with the necessary flow rate V1 of the coolant, basing on respective coolant valves 10-1-10-N, the necessary flow rate V1 of the coolant, a shunting rate alpha1 of the coolant oil injecting from respective coolant valves 10-1-10-N, and the equiation I .

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an automatic coolant pulp system for a foil rolling mill that corrects local strain in a rolled plate by spouting coolant oil to each part of the rolling roll and controlling the temperature of each part of the roll individually. The present invention relates to a flow rate control device, and more particularly to an automatic coolant pulp flow rate control device for a foil rolling mill that takes into account coolant oil flowing to adjacent roll sections and makes accurate corrections.

In general, local distortions in a rolled plate that occur during rolling are corrected by injecting coolant oil onto the rolling rolls and adjusting the temperature of each part of the rolls.

FIG. 7 is a configuration diagram showing the configuration of this type of conventional automatic coolant pulp flow rate control device fi, la.

1b rolls the rolled material 2 with a rolling roll. A shape detector 3 is provided so as to be in contact with the rolled material 2, and detects the shape at each point in the width direction of the sheet to generate a shape signal 5i (i=1.2...
N) is output. 4 is an input interface 7 ace circuit which supplies the shape signal Si received from the shape detector 3 to the required flow rate calculation means 5.

The required flow rate calculating means 5 calculates the coolant flow rate V1 (i=1.2...
- Calculate N) and supply the information to the output interface circuit 7. The output interface circuit 7 outputs a control signal C1 (i==1.2...N) according to the required flow rate v1.
is supplied to the valve opening adjuster 9-1 (i=1.2...N). In addition, the input interface 7 ace circuit 4, the required flow rate calculation means 5, and the output interface 7 ace circuit 7
constitutes the control section 8. The pulp opening degree regulator 9-i controls the coolant valve 1O-i (
Adjust the valve opening degree of i=1.2...N). N coolant valves 10-1 are provided in the axial direction of the rolling roll 1a, and inject coolant oil to each roll portion.

Figure 2 shows the valve row of this coolant valve 10-1 and each roll portion 1l-i of the roll 1a (i=1°2...N).
FIG. In the figure, coolant oil 12-i (i
:1, 2...-N) are injected onto the roll portion 11-1 with an expansion angle determined by customizing the valve 10-i. Further, 13 is coolant oil supplied to each valve 1O-iK.

In such a configuration, the required flow rate calculating means 5 calculates the required flow rate V1 by performing the following processing.

(2) Let the distance in the width direction from the side edge of the rolled plate to the center of each roll portion 11-1 be Xl, and a representative function representing the plate shape ゛ r f (x,) = a-1-bxt + cx1.
(i=1.2...-N) ・・・・・・・・・ (
The constants a, b, and c of 1) are obtained by regression analysis of the shape signal S(obtained from the shape detector 3).

■ Substitute the obtained a, b, and e into equation (1) to calculate the frame f (xt) (i=1.
2...N) is found.

■ Based on the shape signal S supplied from the shape detector 3, the actual value r of each part of the roll (i = 1.2...
N) and the difference δ from the value f(xi) to be formed in the above
Find (xl).

That is, δ(x,)=r1-f(xl)(i=1.2...N
) ・・・−・・・・・・・・・ (2) This δ(
xl) is the local strain amount.

■ Find the amount of runt oil V□ required to correct δ (xl). This is obtained by multiplying δ(Xl) by a constant k.

That is, v = 1 δ (XL) (i = 1.2・-N)...
(3) The thus obtained coolant oil with an oil amount of V is injected from the coolant valve 10-1 to correct local distortions in each part of the roll.

By the way, in Fig. 2, the coolant flow (10-
Coolant oil 12-1 with a flow rate Vi, injected from 1
is branched not only to the roll portion 11-1 but also to the adjacent roll portions 11-(i-1) and 11-(i+1). If this flow division ratio is α1, α1 is a constant determined by the expansion angle of the coolant valve 10-1, and the amount of coolant oil U1 that actually flows into the roll portion 11-i is U1=(1-2(!□ )V1+(Xl, -Vl-1
＋α１＋・' ” ■'＋＋−・・・・・・・・・ （
4) (i=1.2...N). In this equation, the seventh term on the right side is valve 10-1
to the roll part 11-1, the second term is the valve 10-(i-
1) to the roll portion 11-1, the third term is the valve 1O-(
i+1) to the roll portion 11-1. As is clear from this equation, actually the roll portion 11
-1 is generally different from the flow rate (required flow rate) vl that should flow to the roll portion 11-1, and the amount of oil flowing into the roll portion 11-1 is excessively (or underly) Ul-V. )
This caused the coolant oil to flow, causing errors in local distortion correction.

SUMMARY OF THE INVENTION In view of the above circumstances, it is an object of the present invention to provide an automatic coolant valve flow rate control device for a foil rolling mill that can correctly correct local strain in each roll portion.

In order to achieve this object, the present invention provides a control section by providing a barrier means between the required flow rate calculation means and the output interface circuit.

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

FIG. 3 is a configuration diagram showing the configuration of an embodiment according to the present invention, and parts corresponding to those in FIG. 7 are given the same reference numerals and their explanations will be omitted.

In the figure, reference numeral 6 denotes arithmetic means, which is composed of an arithmetic unit 6a and a storage device 6b. ) The arithmetic unit 6a inputs the required flow rate V1 supplied from the required flow rate calculation means 5 into 7 described below.
The following conversion is performed and the pulp flow rate set value L1 is supplied to the output interface circuit 7. Furthermore, the storage device βb is 1
Stores constants needed for the next transformation.

In the configuration shown in FIG. 3, the shape signal S1 output from the shape detector 3 is supplied to the required flow rate calculation means 5 via the input interface circuit 4, just as in the conventional example. v1 is supplied to the arithmetic unit 6a. The arithmetic unit 6a subjects the required flow rate v1 to a linear transformation given by the following equation (y), and outputs the valve flow rate set value obtained as a result. T, that is, L=A' ・V ・−・・・・・・・・・・−
・(5) In this equation (5), L, A, and V each represent the order σ] matrix T A =7 a 1, α20 ・・−・ −・−・・
−・・・・ 01゛Tatasha a1L=1−2α, (i=II2−−−−−−N
) (5) is transformed, V == 4.1 000100. -0(6) is obtained, but if this is written for each element V1, Ll, V, = (1-2(IEl)L, +c!1-i-L1-
t+α1+1・L-work+, −・・−・・・・−(7). Equation (7) sets Ll to vi in Equation (4) mentioned above, and U
This is a formula in which Vl is substituted for l, and it shows that when the oil amount of the valve flow setting KL work is injected from the coolant pulp 10-i, the coolant flow rate that actually flows to the roll part 11-1 is vl. ing.

Now, the valve flow rate setting value L1 determined as described above is supplied to the pulp opening degree regulator 9-i via the output interface circuit 7, and the pulp opening degree regulator 9-i controls the coolant valve based on this information. The pulp opening degree of 1O-i is adjusted, and coolant oil at a flow rate L1 is injected from the coolant valve 10-i to the roll portion 11-1.

When coolant oil with a flow rate Li is injected onto the roll portion 11-1, the adjacent roll portions 1l-(i-1) and 1l
-(i+1) and adjacent pulp 1O-(
i-1) and 1O-(i+1) to roll part 11-1
As a result of dividing the flow into the roll section 11-1, the coolant flow rate that actually flows through the roll section 11-1 becomes V, which is given by equation (7), but this is the required flow rate v1 itself, and the coolant flow rate that actually flows through each roll section is required. This means that it exactly matches the flow rate.

Note that in order to execute the transformation given by equation (5), the inverse matrix of coefficient matrix 4, 4-1, must be found, but A
Each element of A is a value determined by α, (i=1.2...N), and αL is determined by the characteristics of the coolant valve 10-1, so each element of A is a value determined by the characteristic of the coolant valve 10-1. It can be obtained in advance based on the characteristics.

Therefore, each element C6 of the matrix A- is calculated by the calculation means 6 in advance.
If you store it in the storage device 6b in the
There is no need to calculate A, and the valve flow rate set value L1 can be calculated using the following equation.

Further, the required flow rate setting means 5 and the calculation means 6 may share the same calculation device and storage device.

As explained above, the present invention provides an arithmetic means between the required flow rate calculation means and the output interface 7 ace circuit, and calculates the required flow rate calculated based on the shape signal supplied from the shape detector. 7, taking into account the effect of diversion in the
The following conversion was performed to set the valve flow rate so that the actual coolant flow rate flowing through each part of the roll completely matched the required flow rate, making it possible to completely eliminate errors in correcting local distortion. .

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram showing the configuration of a conventional automatic coolant pulp flow rate control device, Fig. 2 is a diagram showing the relationship between the coolant (11 pulp) and the roll section, and Fig. 3 is the configuration of an embodiment of the present invention. It is a configuration diagram showing 2...Rolled material, 3...Shape detector, 5
...-Required flow rate calculation means, 6... Calculation means, 7... Output interface 7 ace circuit, 9-1
．． 9-2...9-N... Valve opening adjuster,
10-1, 10-2...10-N... Coolant pulp. Applicant Shinko Electric Co., Ltd. Agent Patent Attorney Masatake Shiga

Claims (1)

[Claims] A shape detector that detects the shape of the rolled material in the width direction and outputs a shape signal, and a required coolant flow rate VL (i=1.2・・・N
); a coolant valve for injecting coolant oil to each part of the rolling roll; and a coolant flow rate v1 (i=1.2...N), Diversion ratio α1 of coolant oil to adjacent roll parts and group of relational expressions, V, = (1-2α1)L1+α1-1・Ll-1+α1
Automatic coolant pulp flow rate control for a foil rolling mill, comprising calculation means for determining the amount L1 of coolant oil to be injected based on Device.