KR20110120456A - Method for controlling tension of strip in skin pass mill - Google Patents

Abstract

PURPOSE: A device for controlling tension in a temper-rolling process is provided to enhance production efficiency and ensure high quality product by sensing the tension of a strip in a temper-rolling process, comparing the sensed value with a predetermined reference value for a coil, and controlling the tension of the strip according to the result of the comparison. CONSTITUTION: A device for controlling tension in a temper-rolling process comprises a tension sensor(50), a looper unit(30), and a control unit(10). The tension sensor senses the tension of a strip. The looper unit increases and decreases the tension of the strip. The control unit compares the value sensed by the tension sensor with a reference range. The control unit controls the looper unit according to the result of comparison. If the sensed value exceeds the reference range then the control unit operates the looper unit to decrease the tension of the strip. If not then the control unit operates the looper unit to increase the tension of the strip.

Description

Tension control device for temper rolling process {METHOD FOR CONTROLLING TENSION OF STRIP IN SKIN PASS MILL}

The present invention relates to a temper rolling process, and more particularly to a tension control device of the temper rolling process for controlling the tension of the strip in the temper rolling process.

In general, the skin pass mill (SKIN PASS MILL) is a rough rolling of 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.

In general, when the coil passing through the finishing mill is mounted on the pay-off reel, the amount of tension and rolling of the temper rolling 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. After that, the tension reel is rotated, and in this process, the temper mill roughens 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.

The present invention detects the tension of the strip in the temper rolling process, and compares the detected value with the reference range set in the coil to adjust the tension of the strip according to the comparison result to improve productivity and prevent product quality defects in advance. It is an object of the present invention to provide a tension control device for a temper rolling process.

The tension control device of the temper rolling process of the present invention includes a tension sensing unit for sensing the tension of the strip; A looper portion for increasing or decreasing the tension of the strip; And a control unit for comparing the detected value detected by the tension sensing unit with a reference range to control the looper according to a comparison result.

The control unit of the present invention may include operating the looper to reduce the tension of the strip when the detected value exceeds the reference range.

The control unit of the present invention is characterized in that for operating the looper to increase the tension of the strip, if the detected value is less than the reference range.

The present invention detects the tension of the strip in the temper rolling process, and compares the detected value with the reference range set in the coil to adjust the tension of the strip according to the comparison result to improve productivity and prevent product quality defects in advance. do.

1 is a view showing the relationship between the tension control device and the temper rolling line of the temper rolling process according to an embodiment of the present invention.
2 is a flow chart showing an operation process of the tension control device of the temper rolling process according to an embodiment of the present invention.

Hereinafter, a tension control device of 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 view showing the relationship between the tension control device and the temper rolling line of the temper rolling process according to an embodiment of the present invention.

The tension control apparatus of the temper rolling process according to the embodiment of the present invention includes a tension sensing unit 50, a looper 30 and the control unit 10.

After passing through the finishing mill (not shown), the coil wound on the pay-off reel 20 (PAY OFF REEL) is unwound again and roughly rolled by the rough mill 70 (SKIN PASS MILL) to correct the shape.

In the temper rolling process, when the coil is mounted on the pay-off reel 20, the temper mill 70 adjusts the strip S according to the rolling amount of the temper mill 70 preset according to the size and basic data of the coil. Roll.

Thereafter, the pay-off reel 20 is rotated, and the strip S is guided to the temper mill 70 by the pinch roll 40 while the coil is released. In addition, the end of the strip (S) is gripped (GRIP) to the tension reel (80).

As such, when the end of the strip S is gripped by the tension reel 80 and the tension reel 80 rotates, tension is applied to the strip S. FIG.

After that, the straightener roll 60 (STRAIGHTNER ROLL) corrects the defective portion of the strip (S), and the roughing mill 70 lowers the strip (S) in accordance with the predetermined rolling amount of the roughing mill 70 Correct the shape. In addition, the strip S roughly rolled by the rough rolling mill 70 is wound around the tension reel 80.

In this process, the tension sensing unit 50 detects the tension acting on the strip (S). Here, the tension sensing unit 50 is installed on the pinch roll 40.

The looper part 30 moves up and down while supporting the strip S to increase or decrease the tension of the strip S. The looper part 30 includes a fixture (not shown) and a looper roll (not shown). Fixing bodies are provided at both ends of the central axis (not shown), and both ends of the looper roll are provided at the fixing bodies, respectively. In addition, the central shaft is rotatably installed through a hydraulic cylinder (not shown) or installed to move up and down.

Therefore, in the looper part 30, the central axis moves by the operation of the hydraulic cylinder, and the fixed body fixed to the central axis moves integrally with the central axis as the central axis moves. As a result, by moving the looper roll provided in the fixed body it is possible to adjust the tension of the strip (S) in contact with the looper roll.

For reference, the technical scope of the present invention is not limited to the looper roll of the above configuration, it will include all of the various looper portion 30 that can adjust the tension of the strip (S).

The controller 10 controls the tension of the strip S by controlling the looper 30 according to the tension sensed by the tension sensing unit 50.

When the detection value is input from the tension sensing unit 50, the controller 10 checks whether the coil is within a preset reference range.

Here, the reference range is a range of the detection value set in each coil so that temper rolling is normally performed and telescopes or flaws are prevented, and may be variously set for each coil.

As a result of the check, if the sensed tension is within the reference range, the current position is maintained through the looper part 30.

If the detected value detected by the tension sensing unit 50 exceeds the reference range, the tension acting on the strip S is too large, so that the looper 30 is moved in the direction in which the tension of the strip S decreases. Operate. This process is performed until the detection value detected by the tension sensing unit 50 is within the reference range.

On the other hand, if the detected value is less than the reference range, since the tension acting on the strip S is too small, the looper 30 is operated in the direction in which the tension of the strip S increases. This process is performed until the detection value detected by the tension sensing unit 50 is within the reference range.

2 is a flow chart showing an operation process of the tension control device of the temper rolling process according to an embodiment of the present invention.

First, when the coil is mounted on the payoff reel 20, the controller 10 sets a reference range for the coil.

Thereafter, the pay-off reel 20 is rotated so that the upper part is guided to the temper mill 70 by the pinch roll 40 and is gripped by the tension reel 80.

When the coil is gripped by the tension reel 80, the tension reel 80 rotates. Through this, the strip S roughly rolled by the rough rolling mill 70 is wound around the tension reel 80 (S10).

In this process, since the strip S is unwound from the pay off reel and wound on the tension reel 80, tension is applied to the strip S, and the tension sensing unit 50 detects the tension acting on the strip S. (S20).

When the sensing value sensed by the tension sensing unit 50 is input, the controller 10 compares the sensing value with a reference range and controls the looper 30 according to the comparison result.

That is, it is checked whether the detected value is less than the reference range (S30), and if the detected value is less than the reference range, the looper 30 is controlled so that the tension of the strip S is increased (S32).

On the other hand, by checking whether the detected value exceeds the reference range (S40), if the detected value exceeds the reference range, the looper 30 is controlled to reduce the tension of the strip (S42).

On the other hand, if the detected value is less than or exceeds the reference range, since the detected value is within the reference range, the operation of the looper 30 is maintained at the current state (S50). The tension of the strip S thus remains in its present state.

On the other hand, in the above process, the controller 10 checks whether the temper rolling process is completed (S60), and repeats the above process until the temper rolling process is completed.

That is, the tension control device of the temper rolling process according to an embodiment of the present invention detects the tension of the strip (S) through the tension sensing unit 50 during the temper rolling process, according to the change of the detection value looper 30 ) So that the tension of the strip S is maintained within a preset reference range.

Although the present invention has been described with reference to the embodiments shown in the drawings, it is merely exemplary and various modifications and equivalent other embodiments are possible to those skilled in the art. Will understand. Therefore, the true technical protection scope of the present invention will be defined by the claims below.

10: control unit 20: pay off reel
30: looper portion 40: pinch roll
50: tension sensing unit 60: straightener roll
70: temper rolling mill 80: tension reel

Claims (3)

A tension sensing unit for sensing the tension of the strip;
A looper portion for increasing or decreasing the tension of the strip; And
And a control unit for comparing the sensed value detected by the tension sensing unit with a reference range and controlling the looper unit according to a comparison result. The tension control apparatus of claim 1, wherein the control unit operates the looper to reduce the tension of the strip when the detected value exceeds the reference range. The tension control apparatus of claim 1, wherein the control unit operates the looper to increase the tension of the strip when the detected value is less than the reference range.

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