KR101167211B1 - Method for controlling tension of strip in skin pass process - Google Patents

Abstract

The present invention relates to a strip tension control method of a temper rolling process for controlling the tension of a strip during a temper rolling operation of a skin pass mill, the method comprising: detecting a tension of a strip wound on a tension reel, based on a preset tension value And controlling the rotational speed of the tension reel according to the comparison with the range and the comparison result.

Description

Strip tension control method in temper rolling process {METHOD FOR CONTROLLING TENSION OF STRIP IN SKIN PASS PROCESS}

The present invention relates to a temper rolling process, and more particularly, to a strip tension control method of the temper rolling process for controlling the tension of the strip during the temper rolling of the skin pass mill.

In general, skin pass mills (SKIN PASS MILL) to roughen the coil produced in the rolling line to correct the shape. Refining refers to an operation that substantially improves toughness by making fine grains of steel and adjusting the quality of steel.

Usually, when the coil which has passed through the finishing mill is mounted on the pay-off reel, the rolling amount of the tension and skin pass mill is set according to the size and basic data of the coil, and the upper part of the coil is gripped by the tension reel to impart tension. In addition, the tension reel rotates and in this process the skin pass mill rolls the strip to correct the shape.

The above technical configuration is a background art for helping understanding of the present invention, and does not mean a conventional technology well known in the art.

According to the present invention, the reeling speed of the tension reel is increased or decreased according to the tension of the strip during the temper rolling work of the skin pass mill, so that the tension of the coil is maintained within the reference range, thereby preventing defects in product quality. It is an object of the present invention to provide a method for controlling strip tension in a rolling process.

Strip tension control method of the temper rolling process of the present invention comprises the steps of sensing the tension of the strip wound on the tension reel; Comparing the sensed tension value with a preset reference range; And controlling the rotational speed of the tension reel according to the comparison result.

In the present invention, the step of controlling the rotational speed of the tension reel is characterized in that for reducing the rotational speed of the tension reel, if the tension value exceeds the reference range.

In the present invention, the step of controlling the rotational speed of the tension reel is characterized in that to increase the rotational speed of the tension reel, if the tension value is less than the reference range.

The tension value of the present invention is characterized in that it is detected at the inlet side of the skin pass mill for rough rolling the strip.

The present invention increases or decreases the rotational speed of the tension reel according to the tension of the strip during the temper rolling operation of the skin pass mill, so that the tension of the strip is maintained within the reference range, it is possible to prevent the defect in the quality of the product.

1 is a block diagram of a strip tension control apparatus of a temper rolling process according to an embodiment of the present invention.
2 is a view showing a relationship between the strip tension control device and the temper rolling line in the temper rolling process according to an embodiment of the present invention.
Figure 3 is a flow chart of the strip tension control method of the temper rolling process according to an embodiment of the present invention.

Hereinafter, a method of controlling strip tension in a temper rolling process according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. In this process, the thickness of the lines or the size of the components shown in the drawings may be exaggerated for clarity and convenience of description. In addition, terms to be described later are terms defined in consideration of functions in the present invention, which may vary according to a user's or operator's intention or custom. Therefore, the definitions of these terms should be made based on the contents throughout the specification.

1 is a block diagram of a strip tension control device of the temper rolling process according to an embodiment of the present invention, Figure 2 is a relationship between the strip tension control device and the temper rolling line of the temper rolling process according to an embodiment of the present invention Figure is a diagram.

Strip tension control device of the temper rolling process according to an embodiment of the present invention includes a tension sensing unit 10, the control unit 20 and the tension reel drive unit (30).

The coil passed through the finishing mill (not shown) is unwound again and roughly rolled by a skin pass mill 80 to correct the shape.

In the temper rolling process, when the coil is mounted on the PAY OFF REEL 50, the skin pass mill 80 is stripped according to the rolling amount of the skin pass mill set according to the size and basic data of the coil. Roll crude.

Thereafter, the pay-off reel 50 is rotated, whereby the strip S is guided to the skin pass mill 80 by a pinch roll 70 as the coil is released. In addition, the end portion of the strip S is gripped to the tension reel 60.

As such, when the end of the strip S is gripped by the tension reel 60 and the tension reel 60 rotates, the tension TENSION acts on the strip S.

At this time, the skin pass mill 80 is calibrated by reducing the strip (S) in accordance with a predetermined skin pass mill rolling amount. In addition, the strip roughly rolled by the skin pass mill 80 is wound around the tension reel 60.

In this process, the tension detection unit 10 detects the tension acting on the strip (S) during temper rolling at a predetermined time interval. Here, the tension detector 10 is installed on the pinch roll 70. Therefore, the tension value detected by the tension detector 10 is a tension value at the inlet side of the skin pass mill 80. However, the technical scope of the present invention is not limited thereto, and may include those installed at various positions capable of sensing the tension of the strip S.

The tension reel driver 30 rotates the tension reel 60 to wind the strip S. As shown in FIG. The tension reel driver 30 increases or decreases the rotation speed of the tension reel 60 to increase or decrease the tension acting on the strip S.

The control unit 20 increases and decreases the rotational speed of the tension reel 60 by controlling the tension reel driving unit 30 according to the tension value detected by the tension detection unit 10.

The controller 20 compares the tension value detected by the tension detector 10 with a reference range preset for each coil.

The reference range is a range of tension values that are set such that each coil is normally rolled, and may be variously set for each coil.

As a result of the comparison, when the tension value is within the reference range, the rotational speed of the tension reel 60 is maintained through the tension reel drive unit 30.

If the tension value exceeds the reference range, since the tension acting on the strip S is too large, the rotational speed of the tension reel 60 is reduced through the tension reel driver 30 to reduce the tension.

On the other hand, if the tension value is less than the reference range, since the tension acting on the strip S is too small, the tension is increased by increasing the rotational speed of the tension reel 60 through the tension reel driver 30.

Figure 3 is a flow chart of the strip tension control method of the temper rolling process according to an embodiment of the present invention.

Strip tension control method of the temper rolling process according to an embodiment of the present invention is as follows.

First, when the coil is mounted on the payoff reel 50, the controller 20 sets a reference range for the coil (S10).

Thereafter, the pay-off reel 50 is rotated so that the upper part is guided to the skin pass mill 80 by the pinch roll 70 and gripped by the tension reel 60.

When the coil is gripped by the tension reel 60, the controller 20 controls the tension reel driver 30 to start the rotation of the tension reel 60 (S20). In this process, the strip S is roughly rolled by the skin pass mill 80 and wound on the tension reel 60.

At this time, a tension acts on the strip S, and the tension sensing unit 10 detects a tension acting on the strip S (S30).

When the tension value sensed by the tension sensor 10 is input, the controller 20 compares the tension value with a reference range and controls the tension reel driver 30 according to the comparison result.

That is, it is checked whether the tension value is less than the reference range (S40), and if the tension value is less than the reference range, the rotation speed of the tension reel 60 is increased through the tension reel driver 30 (S42). In this case, since the tension acting on the strip S is too small, the rotational speed of the tension reel 60 is increased to increase the tension.

On the other hand, if the tension value is not less than the reference range, it is checked whether the tension value exceeds the reference range (S50). As a result of the check, when the tension value exceeds the reference range, the rotation speed of the tension reel 60 is reduced through the tension reel driving unit 30 (S52). In this case, since the tension acting on the coil is too large, the rotational speed of the tension reel 60 is reduced to reduce the tension.

On the other hand, if the tension value is less than or less than the reference range, since the tension value is within the reference range, the rotational speed of the tension reel 60 is maintained through the tension reel driver 30 (S60).

On the other hand, in the above process, the control unit 20 checks whether the temper rolling process is completed (S70), and repeats the above process until the temper rolling process is completed.

On the other hand, when the temper rolling process is completed, the rotation of the tension reel 60 is stopped and terminated through the tension reel driving unit 30.

As described above, the strip tension control method of the temper rolling process according to an embodiment of the present invention is to make the tension on the strip (S) within the reference range until the temper rolling work for the coil is completed of the product The occurrence of defects can be prevented in advance.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of limitation, I will understand. Accordingly, the true scope of the present invention should be determined by the following claims.

10: tension detection unit 20: control unit
30: tension reel drive unit 50: pay off reel
60: tension reel 70: pinch roll
80: skin pass mill

Claims (4)

Sensing the tension of the strip wound on the tension reel;
Comparing the sensed tension value with a preset reference range; And
Controlling the rotational speed of the tension reel according to the comparison result,
The controlling of the rotation speed of the tension reel may include reducing the rotation speed of the tension reel when the tension value exceeds the reference range, and increasing the rotation speed of the tension reel when the tension value is less than the reference range. strip tension control method of temper rolling process, characterized in that the one. delete delete The strip tension control method according to claim 1, wherein the tension value is sensed at an inlet side of the skin pass mill for rough rolling the strip.

Images