JPH09253740A - Method for deciding stop position of rolling coil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To decide a take-up stop position so that the revolute tip position and the involute tip position of a rolling coil become proper positions at the time when the tail end of a metallic material passes through a rolling mill. SOLUTION: From an involute tip position and a coil diameter in a rolling coil at the time when the tail end of the metallic material passes through the rolling mill, the involute tip position (w) obtained at the time when the revolute tip reaches a standard position W0, is calculated. When the involute tip position (w) falls into a specified range Θin, the standard position W0 is set as a stop position (first process). When this condition is not realized, the involute tip position (w) obtained at the time when the revolute tip reaches [W0 + dW], is colculated. When both involute tip position (w) and revolute tip position W fall into specified ranges Θin and Θout, the[W0 +dW] is set as a stop position (second process). When this condition is not realized, under the condition that the revolute tip falls into the specified range Θout, a position where the involute tip position (w) approaches most the specified range Θin, is set as a stop position (third process).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention, when forming a rolled coil by winding a hot-rolled metal material, prevents the loosening of the inner winding tip and the outer winding tip of the rolling coil from occurring. The present invention relates to a method for determining a stop position of a rolling coil, which is capable of optimally determining a stop position capable of appropriately setting a winding tip position and an outer winding tip position.

[0002]

Related Background Art A rolled coil obtained by winding a rolled metal material (strip) into a coil in a tension reel is extracted from a mandrel of the tension reel by a coil car and then bound with an iron band or the like. It is delivered to the next process as a product or semi-finished product.

However, if the position of the outer winding tip of the rolling coil, which is the tail end of the metal strip, is improper, when the rolling coil is removed from the mandrel, for example, as shown in FIG.
It may hang outwards or rampage as shown in. Further, when the metal strip is soft and its plate thickness is thin, and the position of the inner winding tip, which is the winding start end of the rolling coil, is inappropriate, as shown in FIG. May loosen. The looseness of the inner winding tip may prevent the rolling coil from being attached to the mandrel in the next step, or may damage the inner winding portion or the mandrel of the metal strip during the attachment.

In FIG. 9, 1 is a rolling coil, 2 is the outer winding tip of the rolling coil 1, 3 is the inner winding tip of the rolling coil 1, and 4 is a coil car. By the way, when forming a rolled coil by inserting a winding core, or when winding a cold-rolled metal strip, the position of the inner winding tip described above does not matter, and in general 10
As shown in (a), if the position of the outer winding tip is positioned within the specified range indicated by the thick line in the figure, the above-mentioned problem can be avoided. However, when the metal strip is a hard material or when the rolling coil has a small diameter, the position of the outer winding tip should be below the rolling coil, as shown by the thick line in FIG. 10 (b), for example. Strict restrictions may be necessary.

However, in the case where the metal strip is hot-rolled and is a thin soft material, in order to avoid the above-mentioned inconvenience, as shown in FIG. It is necessary to regulate the position of the winding tip within the prescribed range and at the same time regulate the position of the inner winding tip within the prescribed range.

[0006]

As described above, in order to regulate the outer winding tip position and the inner winding tip position of the rolling coil, theoretically, the outer winding tip position and the inner winding tip position of the rolling coil are determined. Respectively, and the winding stop position may be determined. However, since the diameter of the rolled coil changes depending on the thickness and length of the wound metal strip, for example, when the winding is completed, the winding stop position should be determined while checking the outer winding tip position. If it is set to, the time loss is large and the controllability is poor. Moreover, it is generally difficult to confirm the position of the leading end of the inner winding unless the rolling coil is extracted from the mandrel. For this reason, it is very difficult to optimally regulate the outer winding leading end position and the inner winding leading end position of the rolling coil to appropriately and efficiently determine and control the winding stop position of the rolling coil.

The present invention has been made in consideration of such circumstances, and an object thereof is, for example, when the tail end of the metal strip leaves the rolling mill, the outer winding tip position and the inner winding tip position of the rolling coil. And so that they are respectively positioned in proper positions, specifically within the prescribed range defined in advance,
An object of the present invention is to provide a method for determining a stop position of a rolling coil, which makes it possible to appropriately determine the winding stop position and perform stop control.

[0008]

In order to achieve the above-mentioned object, the method for determining the stop position of a rolling coil according to the present invention includes the following three methods when winding a hot-rolled metal material to form a rolling coil. It is characterized by having a process. [First Step] The inner winding tip position w ₀ of the rolling coil when the tail end of the metal material passes through a rolling roll is
For example, it is detected from an optical change that occurs on the surface of the rolling coil depending on the winding diameter change portion caused by the inner winding tip, and the outer end formed by the tail end from the inner winding tip position w ₀ and the coil diameter D _0. The position w of the inner winding front end when the winding front end W reaches the reference position W ₀ is calculated, and when the calculated inner winding front end position w is within the specified range θin, the outer winding front end W is the reference position W _0. Is the stop position of the rolling coil. [Second Step] When the inner winding leading end position w calculated in the first step is not within the specified range θin, the outer winding leading end W is displaced from the reference position W ₀ by a predetermined amount dW. The inner winding leading end position w when reaching [W ₀ + dW] is calculated while varying the dW, and the calculated inner winding leading end position w is within the specified range θin, and the outer winding leading end W at that time is specified. The position where the outer-winding tip W reaches the above-mentioned position [W ₀ + dW] when within the range θout is the stop position of the rolling coil. [Third Step] When the inner winding leading end position w calculated in the second step is outside the specified range θin, or when the outer winding leading end position W (= W ₀ + dW) is within the specified range θou.
When it is outside t, the position where the inner winding leading end position w is closest to the specified range θin is the stop position of the rolling coil under the condition that the outer winding leading end position W is within the specified range θout.

That is, the invention according to claim 1 is a metallic material.
In the rolling coil when the tail end of the
Inner winding tip position w₀And coil diameter D₀The outer winding tip W is the standard
Position W₀The position w of the inner winding tip when
If the inner winding tip position w is within the specified range θin,
Winding tip W is reference position W₀The stop position so that
(First step). And if the above conditions are not met
Is the outer winding tip W is the reference position W₀Position displaced from
[W₀+ DW], the inner winding tip position w when
Is calculated while changing the₀+ DW] is the standard
Is within the range θout, and the end position w of the inner winding is within the specified range θin
If it is inside, the outer winding tip W is located at the position [W ₀+ DW]
The position reached is set as the stop position (second step). Further this article
If the conditions are not satisfied, the outer winding tip position W is specified as above.
Under the condition of being within the range θout, the inner winding leading end position w is
The position closest to the specified range θin is the rolling coil.
This is the stop position (3rd step).

Further, the invention according to claim 2 determines whether or not the stop position of the rolling coil in the second and third steps is determined, and whether or not the calculated inner winding tip position w is within the specified range θin. The sum [Φin + Φout] of the stop position function value Φin and the stop position function value Φout that indicates whether or not the outer-winding tip position W is within the specified range θout and is weighted larger than the stop position function value Φin. It is characterized in that the determination is performed based on the condition. That is, by introducing the stop position functions Φin and Φout having different weights, the condition determination for determining the stop position described above can be easily and surely performed.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION A method for determining a stop position of a rolling coil according to an embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing a schematic configuration of a main part of a rolling system to which a stop position determining method according to an embodiment is applied. Reference numeral 11 is a rolling roll for rolling a metal material 12 to a predetermined wall thickness, 13
Is a deflor that guides a metal material (strip) 12 rolled by a rolling roll 11 and sent to a winder, and 14 is a rolling coil that winds a metal material strip 12 supplied through a deflor 13 with a constant tension. 1 is a mandrel of the above-mentioned winding machine forming 1. Rolling roll 11,
The deflor 13 and the mandrel 14 are each driven to rotate by a motor M under the control of a controller 15 which will be described later, and the respective rotation speeds thereof are monitored by a pulse generator PG.

On the other hand, a sensor ES for detecting the tail end of the metal strip 12 which passes through the rolling roll 11 and is rolled is provided in the vicinity of the rolling roll 11. This sensor ES may be a sensor that optically detects whether or not the metal strip 12 is passing through the rolling roll 11 to detect the trailing edge of the metal strip 12, or the pressure applied to the rolling roll 11 may be detected. From the change, it may be possible to detect the escape of the tail end of the metal strip 12 from the rolling roll 11.

A sensor SS for optically detecting the tip end position of the inner coil from the surface condition of the rolling coil 1 is provided at the peripheral position of the rolling coil 1 wound and formed by the mandrel 14. The control unit 15 controls the sensors E
Detection signals by S and SS, and each of the pulse generators P
As will be described later, the winding stop position of the rolling coil 1 is determined based on the output of G, and the rotation of the mandrel 14, that is, the winding of the metal strip 12 by the mandrel 14 is stopped and controlled.

First, the detection of the inner winding leading end position of the rolling coil 1 by the sensor SS will be briefly described. The rolled coil 1 formed by winding the metal strip 12 around the mandrel 14 is wound up every time the winding coil 1 is wound up from the winding start end (inner winding tip) 3 as shown in FIG. It is continuously wound while changing the diameter by the thickness. For this reason, the surface of the rolling coil 1 has the same radius of curvature for approximately one turn with the inner winding tip position as a reference, but forms a step at which the curvature and the direction of the surface change at the inner winding tip position. .

As shown in FIG. 3, the sensor SS illuminates the surface of the rolling coil 1 with a light source 21 and receives its reflected light with a photodetector 22 to change the amount of received light from the above-mentioned rolling. The change point of the direction of the surface of the coil 1 is detected, and the rotation angle of the mandrel 14 at that time is detected as the inner winding tip position. Alternatively, an image of the light source 21 reflected on the surface of the rolling coil 1 is captured by a camera instead of the photodetector 22, and the rolling coil 1 is detected from the position change of the light source image.
By detecting a change point of the direction of the surface of, the rotation angle of the mandrel 14 at the change point detection timing is detected as the inner winding tip position.

That is, if the light source 21 and the photodetector (camera) 22 are linearly arranged toward the center of the rolling coil 1 as shown in FIG. Since the surface of the coil 1 can be regarded as having the same radius of curvature, that is, a perfect circle, the illumination light from the light source 21 is reflected almost toward the photodetector 22. Further, in the camera, the light source image reflected on the surface of the rolling coil 1 is captured at its center. On the other hand, when the surface position of the rolling coil 1 illuminated by the light source 21 is located on the inner winding tip position, the direction of the surface of the rolling coil 1 at the stepped portion is changed as described above. Therefore, as shown in FIG. 3B, the illumination light from the light source 21 is mainly reflected in a direction different from that on the photodetector 22 side. Therefore, the amount of light reaching the photodetector 22 decreases. When the camera is capturing a light source image, the position of the light source image on the surface of the rolling coil 1 is
It will deviate from the center. By the way, the deviation amount d from the center of the light source image is θ, the deviation angle of the orientation of the coil surface at the step portion, L the distance between the coil surface and the light source 21,
When the distance between the coil surface and the camera is h, d = 2 · L · h · sin θ · cos θ / (L + h).

The sensor SS uses the change in the deviation amount d of the light source image or the change in the received light amount of the reflected light as described above,
The position of the surface step portion of the rolling coil 1 is optically detected as the position of the inner winding tip thereof, and is contactless from the outside of the rolling coil 1, and in the forming process of the rolling coil 1 (during the rolling operation of the system). It is supposed to do. Actually, the rotation angle position of the mandrel 14 at the timing when the sensor SS detects the surface step portion of the rolling coil 1 is obtained by the control unit 15 as angle information detected by the pulse generator PG.

Next, a method for determining the winding stop position of the rolling coil 1 in the rolling system shown in FIG. 1 equipped with the above-mentioned sensor SS will be specifically described. The determination of the winding stop position is carried out by the control unit 15 in accordance with the processing procedure shown in FIG. 4, for example, based on the detection signals from the sensors ES and SS described above and the outputs from the pulse generators PG. .

This processing procedure is started by the sensor ES when the metal strip 12 leaves the rolling roll 11, and first it is determined whether or not the position of the inner winding tip of the rolling coil 1 needs to be regulated. Starting from (step S1). That is, according to the material and wall thickness of the rolled coil 1 (metal strip 12), it is necessary to regulate not only the position of the outer winding tip as shown in FIG. 10 (c) but also the position of the inner winding tip. Or not. When it is not necessary to specify the position of the inner winding tip, the stop position W of the outer winding tip
Is determined as the reference position W ₀ set within the predetermined stop position defining range θout of the outer winding front end (step S2), and the processing procedure is ended.

On the other hand, when it is necessary to regulate the position of the inner winding tip as well, it is assumed that the stopping position W of the outer winding tip is the reference position W ₀ , and at that time the inner winding tip is at any position. Is calculated (step S3). This calculation is
Metal strip 12 detects the Uchimaki tip position w ₀ of the rolling coil 1 at a timing which exits the rolling roll 11, of rolling the coil 1 and the Uchimaki tip position w ₀ outside diameter D _0, remaining metal strips 12 It is done according to the winding length.

Specifically, the length of the metal strip 12 fed from the rolling roll 11 at a fixed time and the rolling coil 1
In view of the fact that the circumferential length of the metal strip 12 to be wound as is equal to, the diameter of the rolling roll 11 (or the deflour 13) and the mandrel 14 and the rotation amount (rotation angle) thereof,
The outer diameter D ₀ of the rolling coil 1 corresponding to the length of the metal strip 12 sent out from the rolling roll 11 is obtained. Then, the portion of the metal strip 12 left on the outer periphery of the rolling coil 1 indicated by the outer diameter D ₀ is wound up, and the rolling coil 1 required to position the tail end of the outer winding tip at the reference position W _0. The rotation angle of the (mandrel 14) is calculated. Then, based on this rotation angle and the inner winding leading end position w ₀ of the rolling coil 1 at the timing when the metal strip 12 exits the rolling roll 11, the inner winding leading end of the inner winding leading end when the outer winding leading end is positioned at the reference position W ₀ . The position w is calculated.

After the position w of the inner winding leading end is obtained in this way, it is determined whether or not the inner winding leading end position w is within a predetermined stop position defining range θin of the inner winding leading end (step S4). When the inner winding leading end position w is within the specified range θin, the outer winding leading end position W is set to the reference position W.
_Since it is confirmed that there is no problem in the assumption of ₀ , it is shown that the outer winding leading end position W and the inner winding leading end position w can be set within the respective specified ranges θout and θin. Rolling coil 1 with W as reference position W ₀
The stop position of is determined (step S2).

As described above, it is assumed that the outer winding leading end position W is the reference position W ₀ , the inner winding leading end position w is calculated, and the outer winding leading end position W is determined based on the calculation result. The processing procedure for determining the winding stop position of the rolling coil 1 is the first step in the present invention. When the inner winding leading end position w calculated in step S3 of the first step is not within the specified range θin, the following second
The process procedure of the process is executed. In this process, first, the stop position W of the outer winding front end is set as a position [W ₀ + dW] which is deviated from the reference position W ₀ by a predetermined amount dW (step S
5) It is performed by determining whether or not the position w of the leading end of the inner winding at that time is within the specified range θin (step S).
6). Specifically, the winding angle of a predetermined amount is given as the predetermined amount dW, and the same angle is set in step S3.
The position w of the inner-winding tip when the stop position W of the outer-winding tip is [W ₀ + dW] is obtained as [w = w + dW] by adding to the inner-winding tip position w calculated in. Then, it is determined whether or not the inner winding leading end position w falls within the specified range θin.

When the inner winding leading end position w falls within the specified range θin, the evaluation function value Φin of the stop position is set to [1] (step S7). The evaluation function value Φin is set to [0] (step S8). Further, it is determined whether or not the stop position [W ₀ + dW] of the outer winding tip is within the specified range θout of the outer winding tip (step S9), and the outer winding tip position [W ₀ + dW] is the specified range θout. If it is within the range, the evaluation function value Φout at the stop position is set to [2] (step S10), and if it is outside the specified range θout, the evaluation function value Φout is set to [0] (step S11). ).

The above evaluation function values Φin and Φout are defined in order to easily evaluate the stop positions of the inner winding tip and the outer winding tip, and the outer winding stop is compared with the evaluation function value Φin of the inner winding stop position. The weight of the evaluation function value Φout of the position is set to be large, so that the stop position of the outer winding leading end is preferentially determined as described later. After the evaluation function values Φin and Φout of the inner winding tip position w and the outer winding tip position W of the rolling coil 1 are obtained as described above, these evaluation function values Φin and Φout are added, and the overall evaluation value is obtained. Φ [=
Φin + Φout] is calculated (step S12). Then, whether or not this evaluation value Φ is [3], that is, the inner winding leading end position w is within the specified range θin, and the outer winding leading end position W [=
It is determined whether [W ₀ + dW] is within the specified range θout (step S13). When the evaluation value Φ is [3], the outer winding tip position W is assumed to be the position [W ₀ + dW], the stop position is determined (step S14). In this way, the stop position W of the tip of the outer winding is
In the second step of the present invention, the processing procedure of determining the stop position of the rolling coil 1 by evaluating the inner winding leading end position w and the outer winding leading end position W in the case where is shifted from the reference position W ₀ by a predetermined amount dW. is there.

The processing procedure of the second step is the evaluation value Φ.
Is not [3], that is, when one of the inner winding leading end position w and the outer winding leading end position W is not within the specified range θin, θout, the deviation amount dW from the reference position W _{0 corresponds} to one revolution of the rolling coil 1. It is repeatedly executed while sequentially changing the deviation amount dW while determining whether or not the variable setting has been performed over the period (step S15). When the stop position of the rolling coil 1 is determined as [W ₀ + dW] by the condition determination based on the evaluation value Φ described above in this iterative process, the stop position determination process of the second step is ended.

However, the deviation amount dW is set to 1 of the rolling coil 1.
When the inner winding leading end position w and the outer winding leading end position W are evaluated while being variably set over the circumference, but the evaluation value Φ of [3] is not obtained, Three
In the process, within the variable range of the displacement amount dW where the evaluation value Φ is [2], whichever amount is closest to the stop position condition where the evaluation value Φ is [1], and the position of the outer winding tip at that time is obtained. [W ₀ + dW] is determined as the stop position (step S16). That is, when the inner winding leading end position w is not within the specified range θin, or when the outer winding leading end position W is not within the specified range θout, the third step shown in step S16 is executed. Specifically, in the variable range (Φ = 2) of the deviation amount dW within which the outer winding leading end position W falls within the specified range θout, the deviation amount dW when the inner winding leading end position w comes closest to the specified range θin The outer winding tip is positioned at the position [W ₀ + dW] indicated by the deviation amount dW at that time.
The stop position is determined, and the processing procedure ends.

The procedure for determining the stop position in the above-mentioned first to third steps will be further described. For example, as shown in FIG. 5, the position where the outer winding tip of the rolling coil 1 on the lower side in the winding direction is most stable is determined as the reference position W ₀ . Then, in the first step, when the tip of the outer winding is positioned at the reference position W ₀ , the position where the tip of the inner winding is positioned is calculated and evaluated. In this case, if the position w of the inner winding tip is within the predetermined specified range θin indicated by the arrow range A, the inner winding tip is also in a stable position with the outer winding tip positioned at the most stable reference position W _0. The reference position W
₀ is determined as the stop position of the rolling coil 1, that is, the stop position W of the tip of the outer winding.

On the other hand, when the outer winding front end is positioned at the reference position W ₀ , if the inner winding front end is positioned outside the specified range θin indicated by the circle in the figure,
The second step is executed. Then, when the stop position of the outer winding front end is displaced by a predetermined amount dW, it is sequentially checked whether or not the stop position of the inner winding front end, which changes accordingly, falls within the specified range θin. When the position of the inner winding tip is within the specified range θin, the evaluation function value Φin is set to [1], and when the position of the outer winding tip is within the specified range θout indicated by the arrow ranges B and C, the evaluation function value Φout. When the evaluation value Φ is calculated with [2] as [2], the evaluation value Φ changes as shown in FIG. 6 when the deviation amount dW changes for one revolution.

The evaluation value Φ indicates that when the value is [0], neither the inner winding leading end nor the outer winding leading end can be positioned within the specified range θin, θout. Also, when [1] is set, only the inner winding tip is positioned within the specified range θin, and when [2] is set, only the outer winding tip is positioned within the specified range θout. When the value of [3] is taken, it means that both the inner winding tip and the outer winding tip are positioned within the respective specified ranges θin and θout for the first time. Therefore, in the case of the example shown in FIG. 6, when the deviation amount dW is set to 120 to 150 °, it is shown that the inner winding leading end and the outer winding leading end are positioned within the respective specified ranges θin and θout. The stop position of the rolling coil 1 is determined within the range. Specifically, the deviation amount dW when the above condition is first satisfied is determined as the stop position, and the winding is stopped when the position W of the outer winding tip reaches the position [W ₀ + dW]. To

On the other hand, even if the deviation amount dW is varied over one turn, if both the inner winding leading end and the outer winding leading end cannot be positioned within the respective specified ranges θin and θout, the third value is obtained. The stop position is determined by the process. That is, as shown in FIG. 7, when the outer winding front end is positioned at the reference position W ₀ , the inner winding front end position w is positioned on the opposite side, and the shift amount
As shown in FIG. 8 where the evaluation value Φ varies even when dW is varied over one revolution, when the inner winding leading end and the outer winding leading end are not positioned within the respective specified ranges θin and θout at the same time. Is the specified range θou according to the evaluation value Φ
Find the regions that are prioritized within t. This Figure 8
In the example shown in, the range of the deviation amount dW at which the evaluation value Φ is [2] is 0 to 25 °, 120 to 175 °, 335 to 360 °.
(−25 to 0 °) is calculated. Then, in these ranges, the position where the inner winding tip comes closest to the specified range θin is obtained. Specifically, in the example shown in FIG. 8, the range in which the inner winding tip is positioned within the specified range θin is 200 to 320 ° as the range of the deviation amount dW at which the evaluation value Φ is [1].
Ask as. Then, in the range where the evaluation value Φ is [2], the position (deviation amount dW) closest to the range where the evaluation value Φ is [1] is obtained as the position where the inner winding tip is the closest to the specified range θin, In this example, 335 ° (-25
°) as the stop position.

Thus, according to the present method, as described above, the stop position of the rolling coil 1 is determined by calculating the positions of the inner winding tip and the outer winding tip when the metal strip 12 leaves the rolling roll 11. It is possible to stop the rolling coil 1 at an optimum position where the winding end of the inner coil and the outer coil end do not sag by anticipating the completion of winding the rolling coil 1. Moreover, by introducing the above-mentioned evaluation function values Φin and Φout, it is possible to easily determine the conditions of the stop positions of the inner winding tip and the outer winding tip and determine the optimum stopping position, so that the control efficiency is improved. be able to.

In particular, the stop position is determined in the first step, and when the stop position cannot be determined in the first step, the stop position is determined in the second step, and also in the second step. If the stop position cannot be determined, the third
Since the stop position is determined by giving priority to the position of the outer winding tip in the process, even if the rolling conditions change, it is possible to flexibly deal with this and optimally determine the stop position of the rolling coil 1. It is effective.

The present invention is not limited to the embodiment described above. For example, the position of the inner winding leading end may be detected at the beginning of the winding, and the mandrel 14 may be wound and driven while managing the position information to appropriately calculate the inner winding leading end position information. Even in this case, when the metal strip 12 leaves the rolling roll 11, the final positions of the outer winding tip and the inner winding tip are calculated according to the remaining winding amount, and the stop positions thereof are calculated. Should be decided. In addition, the present invention can be variously modified and implemented without departing from the gist thereof.

[0035]

As described above, according to the present invention, the positions of the inner winding tip and the outer winding tip of the rolling coil are calculated when the metal material leaves the rolling roll, and these positions are optimized. Since the stop position of the rolling coil is determined so that the rolling coil can be effectively stopped at a position where dripping or rampage does not occur at the inner winding tip or the outer winding tip, it is practically excellent. It is possible to exert the effect.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a main part of a rolling system to which the present invention is applied.

FIG. 2 is a diagram showing a step portion on the coil surface due to an inner winding tip of a rolling coil.

FIG. 3 is a view for explaining the principle of detecting the inner winding leading end position from the stepped portion on the coil surface.

FIG. 4 is a diagram showing an example of a processing procedure for determining a stop position according to an embodiment of the present invention.

FIG. 5 is a diagram showing a relationship between an inner winding tip and an outer winding tip of a rolling coil and a stop regulation range thereof.

FIG. 6 is a diagram showing an example of a change in the evaluation value Φ when the shift amount dW is changed and a method of determining a stop position in the second step based on the change.

FIG. 7 is a diagram showing a relationship between an inner winding tip and an outer winding tip of a rolling coil and a stop regulation range thereof.

FIG. 8 is a diagram showing an example of a change in the evaluation value Φ when the shift amount dW is changed and a method of determining a stop position in a third step based on the change.

FIG. 9 is a schematic diagram illustrating sagging of an inner winding tip and an outer winding tip in a rolling coil.

FIG. 10 is a schematic diagram illustrating a regulation range with respect to positions of an inner winding tip and an outer winding tip in a rolling coil.

[Explanation of symbols]

 1 Rolling coil 2 Outer winding tip 3 Inner winding tip 4 Coil car 11 Rolling roll 12 Metal material (metal strip) 13 Deflur 14 Mandrel 15 Control unit ES sensor (tail end detection of metal strip) SS sensor (inner winding tip position detection)

Claims (2)

[Claims] 1. When winding a hot-rolled metal material to form a rolling coil, an inner winding tip position w ₀ of the rolling coil when the tail end of the metal material passes a rolling roll is detected. The position w of the inner winding tip when the outer winding tip W formed by the tail reaches the reference position W ₀ is calculated from the inner winding tip position w ₀ and the coil diameter D _0, and the calculated inner winding is calculated. When the tip position w is within the specified range θin, the outer winding tip W is the reference position W _0.
To a stop position of the rolling coil, and when the calculated inner winding leading end position w is not within the specified range θin, the outer winding leading end W is located from the reference position W ₀ . The inner winding leading end position w when reaching the position [W ₀ + dW] displaced by a fixed amount dW is calculated while varying the dW, and the calculated inner winding leading end position w is within the specified range θin, and A second step of setting the position at which the outer winding tip W reaches the position [W ₀ + dW] as the stop position of the rolling coil when the outer winding tip W is within the specified range θout, and the calculated inner winding tip When the position w is outside the specified range θin, or when the outer-winding tip position W at that time is outside the specified range θout, the inner-winding tip position w falls under the condition that the outer-winding tip position W is within the specified range θout. The position closest to the specified range θin is rolled The third step and the stop position determining method of rolling coil, characterized by comprising a to-yl stop position. 2. The stop position of the rolling coil in the second and third steps is determined by determining a stop position function value Φin indicating whether or not the inner winding leading end position w is within its specified range θin, and the outer winding. The determination is made based on the sum [Φin + Φout] of the sum of the stop position function value Φout, which indicates whether the tip position W is within the specified range θout, and which is weighted larger than the stop position function value Φin. The method for determining the stop position of the rolling coil according to claim 1.