JP2001191115A - Metal strip coiling method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a metal strip coiling method capable of perfectly eliminating defective products caused of telescoping. SOLUTION: In the method for coiling a metal strip 1 for using a belt wrapper 20, the belt tension per unit width of the wrapper belt 3 provided on the belt wrapper is taken as >=30 N/cm for a 1st period from the contact of the tip part of the metallic strip with the wrapper belt till at least one or more turns are wound around a coiling shaft 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for winding a metal band, and more particularly to a method for winding a metal band around a winding shaft using a belt wrapper.

[0002]

2. Description of the Related Art As a method of winding a metal strip, for example, a cold-rolled thin steel strip or a surface-treated thin steel strip, into a coil shape, the outer surface of an endless belt called a wrapper belt is arranged along the outer peripheral surface of a winding shaft. A method of using a device called a belt wrapper to wind a steel strip around a winding shaft is often used.

On the other hand, one of the problems that occur in the winding process of the steel strip is that the position of the steel strip is shifted in the direction of the winding axis, and a part of the width of the tip end of the steel strip is excessively protruded from the regular coil end face position. There is a phenomenon called winding deviation (see FIG. 2). When this winding deviation occurs, in the coil 9, the protruding portion 10 is bent or a scratch is generated on the steel strip in the subsequent handling process, so that it is necessary to perform rewinding, and productivity is reduced. .

[0004] As means for preventing this winding deviation, for example, an edge position control (EPC) for changing the width direction position of the steel strip so that the output of the steel strip width end detector arranged on the steel strip transport path matches the target value. ) Method to lead the end of the steel strip to the center of the length of the reel and wind it, or change the position of the steel strip touch roller provided on the entrance side of the reel to increase the tension of the steel strip. It has been known.

[0005]

However, in the above-mentioned conventional means, the effect of preventing the winding deviation is not sufficient, and the winding deviation still occurs at a considerable defective rate.

It is an object of the present invention to provide a method for winding a metal strip, which can completely eliminate defective products due to winding deviation.

[0007]

Means for Solving the Problems The inventors of the present invention have conducted intensive investigations and studies in order to achieve the above object, and as a result, after the tip of the steel strip has come into contact with the wrapper belt, the winding of the winding shaft has exceeded one turn. The present inventors have found that if the tension of the wrapper belt before winding is increased to a certain value or more, winding deviation can be effectively prevented, and the present invention has been made.

That is, according to the present invention, in a method for winding a metal band using a belt wrapper, a belt tension per unit width of a wrapper belt provided in the belt wrapper is determined by:
In the first period from when the tip of the metal strip comes into contact with the wrapper belt to when it is wound around the winding shaft by at least one turn, 30 times
N / cm or more.

The belt tension during the first period is preferably 45 N / cm or less.

In the second period from when the first period elapses to when the winding is completed, the belt tension is preferably less than 30 N / cm.

The belt tension in the second period is 10 to 20 N / cm.
Is preferred.

[0012]

FIG. 1 shows an example of a belt wrapper in which the present invention is implemented. The belt wrapper 20 supports the wrapper belt 3 with the pulley 4 and the pulleys 41 to 46,
The outer periphery of the wrapper belt 3 holds the winding shaft 2. The pulley 4 is configured to be biased by a cylinder 7 via a lever 5 supported by a fulcrum 6 with respect to the winding shaft 2, and to apply a tension to the wrapper belt 3 in accordance with the displacement.

The steel strip 1 enters between the winding shaft 2 and the wrapper belt 3, is guided by the wrapper belt 3 to which a predetermined belt tension is applied by the pulley 4, and is wound around the winding shaft 2. Conventionally, the belt tension has been set to 20 N / cm or less per belt unit width from the viewpoint of belt life.

However, according to the inventor's intensive investigation and study, with the conventional belt tension, the steel strip tip portion comes into contact with the wrapper belt and then winds more than one turn around the winding shaft (this period is the first period). In some cases, the resistance to slip of the steel strip in the winding axis direction (steel strip width direction) becomes insufficient in some cases, and it has been found that the slip generated in this case causes a winding deviation. Therefore, further experiments were conducted, and it was found that the belt tension had to be 30 N / cm or more in order to effectively suppress such slippage. Here, it is known from operation experience that the first period is wound more than one roll and stably wound at about five rolls.

Therefore, in the present invention, the belt tension in the first period is limited to 30 N / cm or more. As a result, the winding deviation can be limited within an allowable range.

The upper limit of the belt tension is preferably about 45 N / cm in consideration of the strength of the wrapper belt normally used.

Also, after the first period elapses and until the winding is completed (this period is referred to as a second period), the belt tension is also reduced.
Since it is not advisable to keep the belt tension at 30 N / cm or more from the viewpoint of the life of the belt, it is preferable to lower the belt tension to less than 30 N / cm, particularly to the normal level of 20 N / cm or less, in the second period.

The lower limit of the belt tension in the second period is as follows:
From the viewpoint of preventing the wrapper belt from meandering, it is preferable to set it to about 10 N / cm.

[0019]

EXAMPLE An example in which the present invention is applied to a surface treatment line for continuously electroplating a cold-rolled steel sheet will be described. At the output side of this line, two belt wrapper type winding devices of the kind shown in FIG. 1 are provided, and by operating these two units alternately, the line is fed at a line output side speed of 80 mpm. The surface-treated steel strip is wound up without interruption for each coil.

Conventionally, the belt tension of the wrapper belt is set to 15 to 20 N for the entire period from the start to the completion of winding for each coil.
/ cm 2 and wound up. In contrast, in the embodiment, the belt tension at the start of winding was set to 30 to 35 N / cm, and the belt tension was changed to 15 to 20 N / cm when the tip of the steel strip was wound around the winding shaft by 5 turns. Thereafter, this value was maintained until winding was completed.

As a result, the defect rate due to winding deviation, which did not fall below about 50% in the past (the width of the steel strip tip protruding is within the allowable range of 5 mm
The occurrence rate of the product coil exceeding 0% was 0% in the example, and the occurrence of the product defect due to the winding deviation could be completely prevented.

In the embodiment, the wrapper belt did not break during the winding, and the belt life was almost the same as the conventional one.

[0023]

As described above, according to the present invention, there is an excellent effect that it is possible to completely eliminate a product defect due to a winding deviation in a metal band winding process using a belt wrapper.

[Brief description of the drawings]

FIG. 1 is a configuration diagram illustrating an example of a belt wrapper.

FIG. 2 is a conceptual diagram showing a winding deviation.

[Explanation of symbols]

 Reference Signs List 1 steel strip (metal strip) 2 reel (mandrel) 3 wrapper belt 4 pulley (for applying tension) 5 lever 6 fulcrum 7 cylinder 9 coil 10 protrusion 20 bell trapper 41, 42, 43, 44, 45, 46 pulley

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Makoto Toyoda 1 Kawasaki-cho, Chuo-ku, Chiba City, Chiba Prefecture Inside the Chiba Works of Steel Corporation (72) Inventor Kei Kei Yuki 1 Kawasaki-cho, Chuo-ku, Chiba City, Chiba Prefecture Kawasaki F Term in Chiba Works (Reference) 4E026 BC08

Claims (4)

[Claims] 1. A winding method for a metal band using a bell wrapper, wherein a belt tension per unit width of a wrapper belt provided on the belt wrapper is adjusted to at least one time by a winding shaft after a tip end of the metal band contacts the wrapper belt. A method for winding a metal strip, wherein the pressure is set to 30 N / cm or more in a first period before winding over the winding. 2. The method according to claim 1, wherein the belt tension during the first period is 45 N / cm or less. 3. The method for winding a metal band according to claim 1, wherein the belt tension is less than 30 N / cm 2 during a second period from when the first period elapses to when winding is completed. 4. The belt tension in the second period is 10 to 20 N / c.
m.