JPH0317568B2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to an automatic rolling control method for rolled foil, etc., and in particular, a method for automatically controlling rolling conditions so that the rolled foil, etc. matches a target shape when wound on a take-up reel. related to a method of controlling In addition, in this specification, the term "rolled foil etc." is used to include rolled thin plates.

Conventional technology Conventionally, shape control of rolled foil, etc. is performed by detecting the shape of the rolled foil, etc. immediately after rolling with a shape detector installed on the exit side of the rolling mill, and then controlling the roll bending so that the shape matches the target shape value. This was done by controlling rolling conditions such as ding and coolant zone.

Problems to be Solved by the Invention However, particularly in rolling aluminum foil, the target shape detected by a shape detector does not necessarily match the shape when the foil is wound around a take-up reel. When we considered the cause of this problem, we found that although the shape of the rolled foil detected by the shape detector immediately after rolling matched the target shape, the shape changed when it was wound on the take-up reel. It turned out that the shape was different from that of the torimae.

That is, in the conventional control method of controlling based on the actual value immediately after rolling and before winding on the take-up reel, it is difficult to obtain rolled foil, etc. in the desired shape when it is wound on the take-up reel. It was something that I couldn't do.

The present invention has been made in view of such problems, and provides a method for automatically controlling rolling so that the shape of rolled foil, etc., in a state wound around a take-up reel matches a target shape. The purpose is to

Means for Solving the Problem The inventors conducted various experiments and research for the above purpose, and found that the rolled foil, etc. in the state of being wound on the take-up reel conforms to the target shape. In order to control the winding, we believed that it was necessary to predict and control the shape change that occurs when the winding is wound around the take-up reel, and as a result of further intensive research and experimentation, we were able to complete this invention. It is ivy.

That is, the method for controlling the shape of rolled foil, etc. according to the present invention is a method of controlling the rolling of the rolled foil, etc., in a state wound around a take-up reel, so that the rolled foil, etc. matches the desired shape. Set shape value X,
While rolling with rolling conditions set according to the target shape value
From these data, the width W of the rolled foil, etc. at the exit side of the rolling mill, the thickness h of the rolled foil, etc., and the stress-strain characteristic data of the rolled material, the rolled foil, etc. is transferred to the take-up reel. A calculation unit predicts and calculates the change in shape that will occur during wrapping, corrects the desired target shape value X according to the calculation result, and adjusts the elongation rate change corresponding to the corrected target shape value The widthwise variation distribution Δεο(z) of the strain based on the width direction is fed back to the calculation unit, while the shape of the rolled foil etc. is measured before being wound on the take-up reel, and the shape value Y is determined as the corrected target shape value. This method is characterized by feedback control of the rolling mill conditions so as to match X'.

The control method according to the present invention does not control the actual value obtained by a shape detector (shape sensor roll, etc.) placed on the exit side of the rolling mill to match the target shape, but rather This control is performed so that the rolled foil or the like in a state wound around a reel matches a target shape. This is done in consideration of the fact that the shape of the rolled foil etc. changes when it is wound around the take-up reel.

Therefore, in the present invention, it is necessary to predict the shape change of the rolled foil etc. when it is wound on the take-up reel. Such shape change corresponds to the residual strain distribution εp(Z) of the rolled foil winding, and therefore, the shape change can be predicted by determining the residual strain distribution εp(z). The above residual strain distribution εp(z) is
It is determined based on the following formula.

εp(z)=εt(z)−f(εt(z))/E Here, εt(z) is the width direction distribution of strain determined by the tension, and is given by the following equation.

εt(z)=Δεo(z)+Δε(z)+εm however, z: A variable indicating the position in the width direction.

Δεo(z): This is the distribution of strain variation in the width direction based on changes in the elongation rate of rolled foil, etc., and can also be measured with a shape detector installed on the exit side of the rolling mill.
Here, corresponding to the modified target shape value X′ described later,
The distribution of strain variation in the width direction is used.

Δε(z): Distribution of strain variation in the width direction caused by non-uniformity of the outer diameter in the width direction of rolled foil, etc. wound on the take-up reel, and is given by the following formula (0 in the shape sensor roll part) ).

Δε(z)=(D(z)−/ Here, D(z) is the distribution in the width direction of the outer diameter of the rolled foil, etc. wound on the take-up reel; is the average value of the same outer diameter, which is obtained from a plurality of non-contact distance sensors installed.

εm: Average value of strain in the width direction of rolled foil, etc., and is determined by the following formula.

εm=/E Here, is the average value of the stress of the rolled foil, etc., and is determined from the following equation.

T/(h・W) Here, T is the take-up tension of the take-up reel,
It is determined from the current value of the take-up reel drive motor or a separately installed tension meter.

h is the thickness of the rolled foil immediately after rolling, and is obtained by a shape measuring device such as a shape sensor roll installed on the exit side of the rolling mill.

W is the width of the rolled foil or the like.

f(εt(z)) is the tension distribution of the rolled foil, etc. on the exit side of the rolling mill, and the component distribution σ(z) is estimated from the alloy composition of the rolled foil, etc. and the pass schedule.
and the strain distribution εt(z), that is, the stress-strain characteristic σ
It is determined from (z)=f(εt(z)).

E is the longitudinal elastic modulus of the rolled foil or the like.

By determining the residual strain distribution εp(z) as described above, the corresponding shape change during winding can be predicted. Then, the target shape value X is corrected according to this shape change value. For example, if the elongation at the middle part in the width direction of the rolled foil, etc. when wound on a take-up reel is larger than the target value, the elongation at the middle part after rolling and before winding will be smaller than the target value. The target value is corrected as follows. Conversely, if it is smaller than the target value, it is corrected to make it larger. Then, corresponding to the target shape value X′ modified in this way,
Width direction variation distribution of strain based on elongation change Δεo(z)
It is assumed that the above calculation is repeated by giving feedback.

The above relationship is expressed in the control block diagram of FIG.

On the other hand, the shape of the rolled foil, etc. before being wound on the take-up reel is measured, and roll bending or rolling of the coolant zone etc. is performed so that the shape value Y matches the corrected target shape value X'. It is assumed that the conditions are controlled by feedback. By controlling in this way, although the shape of the rolled foil etc. differs from the target shape immediately after rolling, it is possible to make the rolled foil etc. conform to the desired target shape when wound on the take-up reel.

Embodiment This invention will be explained in detail based on the embodiment shown in FIG.

The apparatus according to the illustrated embodiment is configured to automatically control the rolling of the rolled aluminum foil A into a target shape when it is wound around the take-up reel 5. In the same figure, on the right side of the broken line,
This is a control block portion corresponding to the conventional shape control method, and the left side is a control block portion added according to the present invention.

The rolling mill 1 is configured such that rolling conditions such as roll bending and coolant zone are controlled by a control means 2, and the aluminum foil A rolled by the rolling mill 1 is rolled along the pass line shown in FIG. A take-up reel 5 is passed through a shape detector (shape detection roll) 3 and a guide roll 4.
It is designed so that it can be wound up.

The shape detection roll 3 is for detecting the widthwise distribution h(z) of elongation of the aluminum foil A immediately after rolling.

On the other hand, a plurality of non-contact distance sensors 7 are arranged along the width direction of the coiled aluminum foil A wound around the take-up reel 5 at positions separated from the coiled aluminum foil A. The sensor 7 measures the widthwise distribution D(z) of the outer diameter of the aluminum foil A that is being wound into a coil, and the data is input to the first calculation section 6. There is.

A tension meter 8 is connected to the shaft of the take-up reel 5, and an output signal corresponding to the tension is input to the calculation section 6.

The width W and thickness h of the aluminum foil A at the exit side of the rolling mill 1 and the stress-strain characteristic σ=f(εt) of the aluminum are inputted into the calculation unit 6. The width W of the aluminum foil A was actually measured on the exit side of the rolling mill. Since this value is approximately constant, it is not necessarily necessary to measure it at every point during rolling. Therefore, it is sufficient to measure once and input the result. The same applies to the thickness h. The stress-strain characteristic σ=f(εt) is data estimated in advance based on the alloy composition of the aluminum foil A and the pass schedule, and it is sufficient to input this data once.

Then, in the first calculation section 6, the shape change of the rolled aluminum foil A when it is wound around the take-up reel 5 is predicted and calculated using the above-mentioned calculation formula, and based on the result, the above-mentioned target is calculated. Shape value X is modified. Then, the strain width direction variation distribution Δεo(z) based on the elongation rate corresponding to the corrected target shape value X′ is fed back to the calculation unit 6,
It is calculated repeatedly.

The corrected target shape value X′ obtained in this way,
The width direction distribution h(z) of elongation corresponding to the shape value Y detected by the shape detector 3 is calculated by the second calculation unit 9.
The arithmetic unit 9 performs arithmetic processing on both of the data and outputs a control signal for making the shape value Y obtained by the shape detector 3 match the corrected target shape value X', which is input to the control means 2. As a result, rolling conditions such as roll bending and coolant zone are automatically controlled by feedback.

In this device, aluminum foil A of a desired shape is
In order to obtain, first, the desired target shape value X, width W,
After inputting the thickness h and stress-strain characteristics,
Rolling may be carried out using the same conventional procedure.

Then, the first calculation unit 6 calculates the shape change during winding, and obtains a corrected target shape value X' corresponding to the shape change. And the correction value
X' and the actually measured shape value Y are subjected to calculation processing by the second calculation section 9, and the control means 2 is automatically subjected to feedback control according to the calculation result, so that when the winding reel 5 is wound on the winding reel 5, An aluminum foil A having a shape matching the target shape value X is obtained.

Effects of the Invention As described above, the automatic rolling control method for rolled foil, etc. according to the present invention is a method for controlling rolling so that the rolled foil, etc. matches the desired target shape in a state where the rolled foil, etc. is wound around the take-up reel. Then, while setting the desired target shape value X in advance and rolling by setting the rolling conditions according to the target shape value (z) and the winding tension T of the winding reel, and these two data,
From the width W of the rolled foil, etc. at the exit side of the rolling mill, the thickness h of the rolled foil, etc., and the stress-strain characteristic data of the rolled material, the shape change that occurs when the rolled foil, etc. is wound on the take-up reel can be estimated. Predictive calculation is performed in the calculation section,
Correcting the desired target shape value X according to the calculation result, and corresponding to the modified target shape value X';
Width direction variation distribution of strain based on elongation rate change Δεo(z)
is fed back to the calculation section, while the shape of the rolled foil, etc. is measured before being wound onto the take-up reel, and the shape value Y is determined as the modified target shape value.
Since the rolling conditions are controlled by feedback to match X′, the shape of the rolled foil, etc. immediately after rolling is detected by a shape detector installed on the exit side of the rolling mill, as in the conventional method, and the actual shape value is calculated. The shape of the rolled foil, etc., actually obtained does not differ from the target shape, unlike in the case of a method in which the rolling conditions are controlled so that the shape matches the target shape value. A rolled foil or the like having a desired target shape can be obtained easily and reliably, and the quality can be further improved.

Furthermore, the rolling control method according to the present invention requires a means for measuring the distribution of the outer diameter of the rolled foil, etc. wound around the take-up reel, a means for measuring the tension of the rolled foil, etc., and a calculation means. However, since existing equipment can be used as is, accurate rolling control can be achieved economically.

[Brief explanation of the drawing]

The drawings show an embodiment of the invention, and FIG. 1 is a control block diagram of the invention, and FIG. 2 is a control block diagram of the invention.
FIG. 3 is a control block diagram on the calculation unit side. DESCRIPTION OF SYMBOLS 1... Rolling mill, 2... Control means, 3... Shape detector, 5... Take-up reel, 6... First calculation section, 7
...Non-contact distance sensor, 8...Tension meter, 9...
Second calculation section, A... aluminum rolled foil.

Claims (1)

[Claims] 1. A method of controlling the rolling of rolled foil, etc., in a state wound around a take-up reel, so that it matches the desired target shape, the method comprising setting the desired target shape value X in advance,
While rolling with rolling conditions set according to the target shape value
From these data, the width W of the rolled foil, etc. at the exit side of the rolling mill, the thickness h of the rolled foil, etc., and the stress-strain characteristic data of the rolled material, the rolled foil, etc. is transferred to the take-up reel. A calculation unit predicts and calculates the change in shape that will occur during wrapping, corrects the desired target shape value X according to the calculation result, and adjusts the elongation rate change corresponding to the corrected target shape value The widthwise variation distribution Δεο(z) of the strain based on the width direction is fed back to the calculation unit, while the shape of the rolled foil etc. is measured before being wound on the take-up reel, and the shape value Y is determined as the corrected target shape value. 1. An automatic rolling control method for rolled foil, etc., characterized by feedback-controlling rolling conditions so as to match X'.