JPH08150413A - Method for coiling metallic strip - Google Patents

Abstract

PURPOSE: To provide a method for coiling a metallic strip without top marks by executing control by setting the leading amount of the tip of the metallic strip in accordance with thickness and width of the metallic strip and presence or absence of oil coating. CONSTITUTION: The number of revolution of a bridle roll 1 is detected with a revolution detector 8 and inputted to a tip position arithmetic unit 9 for operating the position of the tip of the metallic strip 8. The position of the stepped part D of a stepped sleeve 5 is detected with a stepped part detector 10, on the other hand, the number of revolution of a tension reel 4 is detected with the revolution detector 11, these signals are inputted to an arithmetic unit 12 for the position of stepped part and the position of the stepped part D is operated. The leading amount of the metallic strip S is selected with a leading amount setting device 13 based on the information of thickness (t), width W and presence or absence of oil coating and the numbers of revolution of the driving motor 6 for the bridle roll 1 and driving motor 7 for the tension reel 4 are controlled so as to be matched with the leading amount through a stepped part positioning controller 14.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of winding a metal strip while preventing a top mark generated when the metal strip is wound.

[0002]

2. Description of the Related Art Conventionally, it is known that when a thick metal strip is wound around a coil by a winder, a so-called top mark (broken mark) is generated at a subsequent portion overlapping the tip of the coil. As a method of winding while preventing such a top mark, for example, in Japanese Utility Model Laid-Open No. 1-109313, a step or a step is formed on a part of the outer surface of a winding shaft of a winding machine or a sleeve such as rubber coated on the winding shaft. It is disclosed that a recess (hereinafter referred to as a step) is provided and the tip of the metal strip is aligned with the recess so that the corner of the tip does not contact the strip surface after the second roll.

That is, as shown in FIG. 2, a rotation speed detector 23 for detecting the rotation speed of a bridle roll 21 for passing a plate,
A steel strip position detector 25 attached to the outlet side of the outlet side shear 24 to detect the tip position of the metal strip S, and a step portion position detection to detect the position of the step portion D of the stepped sleeve 30 covering the tension reel 26. The signals from the device 28 are respectively input to the computer 29 to calculate the plate passing distance after the mounting position of the steel strip position detector 25, and the tip of the metal strip S and the step D of the stepped sleeve 30 are matched. In addition, the tension reel 26 is activated in advance so that the threading speed and the peripheral speed of the stepped sleeve 30 are synchronized with each other, and the winding tension control is further performed.

By the way, in the case of Japanese Utility Model Laid-Open No. 1-109313, when the tension at the initial stage of winding is not generated, slack is caused by the weight of the metal strip S, and the tip position recognized by the computer 29 is detected. There is a problem that a difference of several mm to several tens of mm occurs from the actual position. In order to solve this problem, there is known a method of predicting slack in advance, compensating for a length corresponding to the amount of slack, and winding while absorbing the slack.

However, depending on the condition of the surface of the metal strip S or the condition of the surface of the stepped sleeve 30 in the initial stage of winding, a slip occurs between the surface and the metal strip S, and only the stepped sleeve 30 is formed. May rotate, and the metal strip S may not follow the metal strip S, resulting in a displacement of several mm to several tens of mm from the step. In order to solve this, there is also known a method in which the leading end of the metal strip S is preceded in advance and the stepped sleeve 30 is slipped to match the leading end (see, for example, JP-A-5-169140).

However, in the method of uniformly setting the leading length of the tip of the metal strip S with respect to the step portion D, the amount of slack due to the thickness and width of the metal strip S, the presence or absence of oil coating, the type of coating, and the like surface. Due to the property, when the frictional force between the metal strip S and the stepped sleeve 30 is different, a required slip amount cannot be obtained, the tip and the step portion cannot be aligned, and the top mark is prevented. There was a problem that I could not do it.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in order to solve the problems of the prior art as described above, and surely controls the alignment of the step portion for preventing the top mark. An object of the present invention is to provide a method of winding a metal strip that can be used.

[0008]

In order to solve the above-mentioned problems, the present invention uses a tension reel in which a step portion is provided on a part of the outer surface of a winding shaft or a sleeve covering the winding shaft. It is a method of winding the tip of the metal strip so that the tip of the metal strip is aligned with the step, and the amount of advance of the tip of the metal strip with respect to the step of the tension reel is set according to the thickness of the metal strip, the plate width, and the presence or absence of oiling. It is a method of winding a metal strip, which is characterized in that it is controlled by the following method.

When setting the preceding amount, the kind of the coating agent for resin-coating the surface of the metal strip may be taken into consideration.

[0010]

The present inventors carried out an alignment test of the tip of the metal strip and the step portion by using the tension reel in which the winding shaft is covered with the step sleeve. In the following, as an example of the experiment, when the preceding amount of the metal strip to be wound is kept constant at 130 mm, various conditions of the plate thickness, plate width, and oil amount are changed, and the amount of residual deviation in each is measured. Will be described.

FIG. 3 shows the amount of residual deviation when the plate width of the oil-coated metal strip is changed while the plate thickness is kept constant at 0.75 mm. From this figure, board width 800 mm
It can be seen that the residual deviation is almost zero. FIG.
Is a measurement of the amount of residual displacement when the plate thickness of the metal strip with oil is changed while the plate width is kept constant at 870 mm. From this figure, it can be seen that the amount of residual deviation is almost zero at a plate thickness of 0.75 mm.

FIG. 5 shows the degree of influence of the presence or absence of oil coating. That is, as a result of evaluating the size of the residual deviation amount with and without oiling using a metal strip having a plate thickness of 0.75 mm and a plate width of 1230 mm, the amount of residual deviation with oiling may be smaller. all right. When such an experiment was carried out by changing the conditions of the metal strip variously, the thicker the plate, the more difficult it is to slip between the metal strip and the stepped sleeve, and the less the amount of slack. It turns out that less is all right. Also,
It was found that the wider the strip width of the metal strip, the less likely it is to slip and the smaller the preceding amount. Furthermore, it has been found that the larger the amount of oil applied, the easier the slipping occurs, and therefore the preceding amount must be increased.

Table 1 shows an example of the results of these experiments.

[0014]

[Table 1]

It should be noted that the above experiment is for the case where there is no resin coating. However, depending on the product standard, there is a case where a resin coating is applied to the surface of the metal strip. Since the coefficient of friction between them changes, it is desirable to include them in the table as well. Thus, according to the present invention,
Since the preceding amount is set and controlled according to the thickness and width of the metal strip, the amount of oil applied to the surface, and the type of coating agent, the tip of the metal strip and the step can be perfectly matched. It is possible to prevent the occurrence of the top mark defect.

[0016]

Embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a schematic diagram showing an embodiment of the present invention. As shown in the figure, the metal strip S sent from the bridle roll 1 is cut at the exit side shear 2 and then taken up by the tension reel 4 covered with the stepped sleeve 5 via the deflector roll 3. . The bridle roll 1 is driven by a drive motor 6 and the tension reel 4 is driven by a drive motor 7.

The number of revolutions of the bridle roll 1 is detected by the number of revolutions detector 8 and is input to a tip position calculator 9 for calculating the tip position of the metal strip S. The position of the step D of the stepped sleeve 5 is detected by the step detector 10, while the rotation speed of the tension reel 4 is detected by the rotation speed detector 11.
Those signals are input to the step position calculating device 12 to calculate the position of the step D.

The preceding amount setting device 13 preliminarily prepares a table as shown in Table 1 by calculating the preceding amount with respect to the step portion D at the tip of the metal strip S depending on the plate thickness t, the plate width W and the presence or absence of oil coating. By storing and storing information about the plate thickness t, the plate width W, and the presence / absence of oil coating of the metal strip S that is wound up on the tension reel 4 most recently,
The value of the preceding amount of the metal strip S is selected from the table and output.

The step position alignment control device 14 inputs the preceding amount from the preceding amount setting device 13, and the tip position signal of the metal strip S calculated by the tip position calculating device 9 and the step position calculating device 12. By inputting the calculated step position signal, the bridle roll 1 is arranged so that the tip position of the metal strip S and the position of the step D of the stepped sleeve 5 coincide with each other.
The rotational speeds of the drive motor 6 and the drive motor 7 for the tension reel 4 are controlled.

In this way, the plate thickness t of the metal strip S wound around the tension reel 4 from the table of Table 1 stored in advance in the preceding amount setting device 13,
The preceding amount is selected and output based on the plate width W and the presence or absence of oiling, and the driving motor 6 and the tension of the bridle roll 1 and the tension are adjusted via the step position alignment control device 14 so as to match the preceding amount. The rotation speed of the drive motor 7 of the reel 4 is controlled to control the traveling speed of the metal strip S by the bridle roll 1 and the winding speed of the tension reel 4. As a result, the positions of the tip of the metal strip S and the step D of the stepped sleeve 5 can be matched.

When the method of the present invention was applied to the winding control of the metal strip, as shown in FIG. 6, the out-of-order occurrence rate due to the top mark was able to be reduced to around 0.1% as compared with the conventional 0.4%. Although the above embodiment has been described with respect to the stepped sleeve 5, the step portion D is directly attached to the winding shaft.
It goes without saying that the same can be applied to the case of winding the metal strip S around the tension reel 4 provided with.
Further, the step D of the stepped sleeve 5 is not limited to the stepped portion and may be a recessed portion.

[0022]

As described above, according to the present invention,
Since the amount of advance of the tip of the metal strip with respect to the stepped portion is set each time using the table, the tip of the metal strip and the stepped portion can be accurately aligned, and thereby winding control without a top mark can be performed. As a result, it contributes to the improvement of product quality and yield.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing an embodiment of the present invention.

FIG. 2 is a schematic diagram showing a conventional example of winding control of a metal strip.

FIG. 3 is a characteristic diagram showing a relationship between a plate width and a residual deviation amount.

FIG. 4 is a characteristic diagram showing a relationship between a plate thickness and a residual deviation amount.

FIG. 5 is a characteristic diagram showing the amount of residual deviation generated depending on the presence or absence of oil coating.

FIG. 6 is a characteristic diagram showing changes in the out-of-order occurrence rate.

[Explanation of symbols]

 1 Bridle roll 2 Outer side shear 4 Tension reel 5 Step sleeve 6,7 Drive motor 8,11 Rotation speed detector 9 Tip position calculation device 10 Step detector 12 Step difference setting device 13 Advance amount setting device 14 Step Alignment control device S Metal strip D Step

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Toshio Yokoyama 1-chome, Mizushima Kawasaki-dori, Kurashiki-shi, Okayama Prefecture (no address) Inside the Mizushima Works, Kawasaki Steel Co., Ltd. (72) Takashi Sekita 1 Mizushima-kawasaki-dori, Kurashiki-shi, Okayama Chome (No house number) Kawasaki Steel Co., Ltd. Mizushima Steel Works

Claims (2)

[Claims] 1. A method for winding a winding shaft or a tension reel having a stepped portion provided on a part of an outer surface of a sleeve covering the winding shaft so that the tip end of the metal strip and the stepped portion are aligned with each other. A method of winding a metal strip, characterized in that the amount of advance of the tip of the metal strip with respect to the stepped portion of the tension reel is set and controlled according to the thickness of the metal strip, the width of the metal strip, and the presence or absence of oil. 2. The winding method for a metal strip according to claim 1, wherein, when setting the preceding amount, the type of coating agent for coating the surface of the metal strip with a resin is taken into consideration.