JP3262730B2 - Method of preventing meandering of metal strip in continuous straightening line - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for preventing meandering of a metal band in a continuous straightening line.

[0002]

2. Description of the Related Art FIG. 2 shows an outline of a conventional straightening line provided with a conventional tension leveler. A metal strip S such as a stainless steel strip unwound from a payoff reel 1 has a welder 3 and a side trimmer. 4. After being sent out through the looper 5 and leveled by a tension leveler (hereinafter simply referred to as a leveler) 7 with a predetermined tension applied between the entrance bridle roll 6 and the exit bridle roll 8, the shape The winding process is performed on the tension reel 2 via the confirmation platen 9 and the shear 10.

By the way, when the line is started / stopped while the metal strip S is being leveled by the leveler 7,
The work roll of the leveler 7 causes a defect called a leveler mark or a roll mark. Therefore, in order to prevent the occurrence of such a leveler mark, when starting or stopping the line, the line speed is temporarily reduced to a low speed, and after the pressure is reduced or released at a speed at which the leveler mark does not occur, the line is accelerated or stopped. In general, measures are taken.

[0004] However, when the leveler 7 is opened at a low speed and under a reduced pressure, the metal strip S passing through the leveler 7 is not leveled during that time, so that a portion whose shape is not corrected occurs. In order to prevent the occurrence of this no leveling part,
An example has been reported in which a method of starting the line after returning the metal strip S in the reverse direction by a length that is not leveled while the leveler is open after the line is stopped has been reported (for example, "Nisshin Steel Engineering Report, No. 54 No. (issued in July 1986,
P.61-68) ”).

In this case, as shown in the drawing, if the side trimmer 4 or the like is provided on the upstream side of the leveler 7, the metal strip S cannot be reversely fed. In this case, the side trimmer 4 and the entrance bridle are not provided. The looper 5 provided between the metal strip S and the roll 6 absorbs the metal strip S that has been fed back. As a result, even when trimming is being performed by the side trimmer 4, the reverse feed can be performed without any trouble.

[0006]

However, in the above-mentioned conventional method, after the metal strip S is fed backward, the line is operated to discharge the metal strip S stored in the looper 5, and then the looper roll 5a is moved to the position shown in FIG. As shown in the figure, the normal operation is started in a state separated from the metal strip S. At this time, the pass line changes, so the metal strip S
However, there is a problem that the meandering is easy to meander (5b in the figure is a deflector roll).

An object of the present invention is to provide a method for preventing meandering of a metal strip in a continuous straightening line, which solves the above-mentioned problems of the prior art.

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides an apparatus which has a leveler between the entrance and exit bridle rolls and which cannot reverse the metal strip upstream of the entrance bridle roll. A method for preventing meandering of a metal strip in a continuous straightening line comprising a looper for storing a metal strip fed back between the apparatus and the entrance bridle roll, the normal operation of the line Sometimes, the metal strip stored in the looper, the metal strip in the continuous straightening line, characterized in that the metal strip is sent out in a state of constantly contacting the looper roll of the looper and the deflector rolls before and after the looper at a predetermined winding angle This is a meandering prevention method.

[0009] A pair of upper and lower auxiliary rolls capable of restraining the metal strip may be arranged on the upstream side of the device that cannot reverse the metal strip.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the drawings. FIG.
FIG. 4 is a side view showing the operation of the looper used in the present invention. First, the metal strip S sent backward when the line is stopped
When the looper 5 is stored in the looper 5, the looper roll 5a is lowered downward by the length of the reverse feed as shown in FIG. 1 (a).

Next, when the metal strip S is sent out from the looper 5 in the normal operation, the metal strip S
The looper roll 5a is gradually moved upward so that the tension applied to the deflector roll 5b does not change abruptly, and finally becomes slightly higher than the deflector roll 5b as shown in FIG. 1 (b). Position the looper roll 5a. Specifically, the metal strip S is placed on the looper roll 5a.
And the deflector rolls 5b before and after it are always brought into contact with a predetermined winding angle θ (for example, about 120 °).
Thereby, the metal strip S generates a restraining force in the plate width direction between the looper roll 5a and the deflector roll 5b due to the frictional force and the tension, so that the meandering of the metal strip S is suppressed.

As shown in FIG. 4, a pair of upper and lower auxiliary rolls are provided on the upstream side of the side trimmer 4 on the entrance side of the looper 5.
13 is set and the metal strip S is wound. As a result, the frictional force and the tension generated between the looper roll 5a and the deflector roll 5b are further increased to generate a large restraining force, and a similar restraining force is also generated in the side trimmer 4. The meandering of S can be suppressed more reliably.

[0013]

According to the present invention, during normal operation of the line, the metal strip stored in the looper is sent out while being constantly in contact with the looper roll of the looper and the deflector rolls before and after the looper at a predetermined winding angle. As a result, meandering of the metal strip can be prevented, which greatly contributes to improvement of product quality and yield.

[Brief description of the drawings]

FIG. 1 is a side view showing an operation of a looper roll of a looper used in the present invention.

FIG. 2 is a schematic diagram showing an example of a conventional continuous processing line.

FIG. 3 is a side view illustrating the operation of the looper roll.

FIG. 4 is a side view showing another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Payoff reel 2 Tension reel 3 Welder 4 Side trimmer 5 Looper 5a Looper roll 5b Deflector roll 6 Inlet bridle roll 8 Outlet bridle roll 7 Leveler (tension leveler) 9 Shape check platen 10 Shear 11 Inlet deflector roll 12 Outlet deflector Roll 13 Auxiliary roll S Metal strip

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP 9-253749 (JP, A) JP 9-295047 (JP, A) JP 9-150201 (JP, A) (58) Field (Int.Cl. ⁷ , DB name) B21D 1/05

Claims (2)

(57) [Claims] 1. An apparatus according to claim 1, further comprising: a leveler provided between the inlet and outlet bridle rolls, a device which cannot reverse the metal strip upstream of the inlet bridle roll, and a reverse between the device and the inlet bridle roll. A method for preventing meandering of a metal strip in a continuous straightening line provided with a looper for storing a fed metal strip, wherein during normal operation of the line, the metal strip stored in the looper is connected to a looper roll of the looper. A meandering prevention method for a metal strip in a continuous straightening line, wherein the metal strip is fed while being constantly in contact with the deflector rolls before and after the roll at a predetermined winding angle. 2. The metal strip in the continuous straightening line according to claim 1, wherein a pair of upper and lower auxiliary rolls capable of restraining the metal strip is disposed upstream of an apparatus that cannot reverse the metal strip. Meaning prevention method.