JPH0775824A - Controller for taking-up tension - Google Patents

Abstract

PURPOSE:To improve a taking-up shape by making a material speed stable after passing through the stand of finish rolling. CONSTITUTION:A strip rolled by a finishing rolling mill is taken up on a mandrel through a pinch roll. After the strip is taken up on the mandrel, this controller becomes a hot rolling equipment driving (step 103) the pinch roll and the mandrel by a current control. After passing-through of the strip from the finishing rolling mill, is detected (step 104), the mandrel is changed over (step 106) to a speed control, and a sudden increase in the speed of the strip, is prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention optimizes the rotation control of a pinch roll and a mandrel after a product comes out of a finish rolling stand in a hot rolling facility, and a winding tension control for improving a winding shape of a coil. It relates to the device.

[0002]

2. Description of the Related Art Hot rolling equipment includes a rough rolling mill for rough rolling, a finish rolling mill for final finishing rolling of a sheet material conveyed from the rolling mill, and a temperature at the exit side thereof. It is provided with a water injection device for adjusting the value, a winding device for winding the rolled strip (plate material), and the like.

Further, the structure from the finish rolling mill to the winding device will be described. A hot run table (hereinafter, referred to as H) for guiding the strip to the rear stage is provided at the latter stage of the finish rolling mill.
A table) is provided, and a plurality of pinch rolls are provided at predetermined intervals behind the H table to apply a predetermined pressing force to the strip. A winding guide (side guide) is provided before and after each pinch roll. In the final stage, a plurality of mandrels serving as cores for winding the plate material to generate a coil are arranged.

The pinch roll and mandrel use speed control, tension control, and current control to drive their rotation. Normally, in the empty state where the strip is not passed through, both the pinch roll and the mandrel are driven by speed control. When the mandrel bites the tip of the strip after the pinch roll bites the tip of the strip, the pinch roll and the mandrel are simultaneously switched to current control. Further, when the tail end of the strip exits the final finishing stand, the pinch rolls are switched to speed control while the mandrel remains current controlled.

[0005]

However, in the above-mentioned prior art, when the material leaves the final finishing rolling stand, the mandrel can be switched to the speed control of the pinch roll while the current control is maintained. If the strip stops when tightened too much, and the gap of the pinch roll is weak (the pressing force is weak), the material speed increases sharply due to the slip of the pinch roll, and the strip tail end does not stop at the expected position It is a cause of defective shape.

Therefore, an object of the present invention is to provide a winding tension control device which stabilizes the material speed after leaving the finishing rolling stand and can improve the winding shape.

[0007]

In order to achieve the above-mentioned object, the present invention provides a method in which a material rolled by a finishing mill is wound on the mandrel via a pinch roll and then the pinch roll and In a hot rolling facility in which each of the mandrels is driven by current control, control means is provided for switching the mandrel to speed control after the material has exited the finishing mill.

The speed control of the mandrel can be performed based on the speed set value obtained by adding a predetermined value to the speed actual result.

Further, the current control of the pinch roll after the material has exited the finishing mill can be carried out based on the tension value of the mandrel.

[0010]

According to the above means, after the material (strip) exits the finishing mill, the mandrel drive is changed from current control to speed control so that there is no speed difference between the pinch roll and mandrel. To be done. This makes it possible to stabilize the material speed regardless of the tightness of the winding guide and the gap state of the pinch rolls, and to eliminate defective winding shape.

Then, the pinch roll is controlled after the material leaves the finishing mill based on the tension value of the mandrel, and the mandrel is controlled based on the actual speed value thereof. This makes it possible to realize control for eliminating defective winding shape.

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a flow chart showing a processing example of the winding tension control of the present invention. FIG. 2 is a configuration diagram showing a winding tension control device and its peripheral equipment according to the present invention.

A plurality of finish rolling stands (here,
An H table 2 is installed in the rear stage of the finishing rolling mill 1 having only four groups F4 to F7), and a winding guide 3, a pinch roll 4 and a winding guide 5 are arranged in the upper part of the rear stage. ing. Further, pinch rolls 6, 7, and 8 are sequentially arranged at the subsequent stage of the H table 2, and winding guides 9 and 10 are arranged between the pinch rolls. Mandrel 11, diagonally below each of the pinch rolls 6, 7, 8
12 and 13 are provided, and each of them has a wrapper roll 1
4, 15 and 16 are arranged so as to come into contact with each other.

In addition to this, a control device 17 is provided for executing the winding tension control and various controls necessary for rolling. The control device 17 is positioned as a subordinate computer of a host computer (or process computer) (not shown) that manages the entire factory, and executes the processing of the present invention under the control of the host computer.

A metal detector 18 for detecting the passage of the material is provided between the winding guide 5 and the pinch roll 6, and similarly between the pinch rolls 6 and 7 and between the pinch rolls 7. , A metal detector 1 on the upper middle part
8 and 19 are provided, and respective output signals are taken in by the control device 17.

The strip that has been finished and rolled by the finish rolling mill 1 passes through the H table 2, is fed by the winding guide 3 directly below the pinch roll 4, and is given a predetermined pressure. Furthermore, the strip is a winding guide 5.
It is bitten in the pinch roll 6 while being guided by. Then the tip of the strip is fed into the mandrel 11.
Upon arrival, it is pressed by the wrapper roll 14 and gradually wound around the surface of the mandrel 11 to form a coil.

When the winding end is reached, the tail end comes out of the pinch roll 6, but at this time, the control according to the present invention is performed to control the rotation of the mandrel 11 to prevent the tail end from being loosened. The wound coil is unwound when being sent to cold rolling or hot rolling.

Next, the strip tail end stop position control of the present invention will be described with reference to FIG. Here, for simplicity of explanation, only the mandrel 11 will be described. In the figure, “S” represents a step.

First, when the tip of the strip does not reach the pinch roll 6, that is, when the pinch roll 6 and the mandrel 11 are idling (S10)
1), the pinch roll 6 and the mandrel 11 are both rotationally driven by speed control (S102). Under this condition, when the metal detector 18 detects passage of the tip of the strip and further reaches the mandrel 11 (for example, by detecting a change in current of the motor of the mandrel 11), the control device Reference numeral 17 switches each of the pinch roll 6 and the mandrel 11 from speed control to current control (S103).

In this state, the trailing end of the strip has come out of the final stand of the finishing rolling mill 1 (this detection is
When a load relay operation (not shown) is detected (S104), the actual speed of the mandrel 11 is stored in a memory (not shown) attached to the controller 17 (S105). The speed control of the mandrel 11 is executed by + α, that is, [speed actual value + α] with respect to this speed actual result (S106). Further, the pinch roll 6 is rotationally driven by current control based on the tension reference of the pinch roll 6 (S107). At this time, the tension of the pinch roll 6 is [pinch roll speed reference-actual value]>
Set to α.

In this way, when the trailing end of the strip exits the final stand of the finish rolling mill 1, the pinch roll 6 and the current control are maintained, and the mandrel 11 is changed from the current control to the speed control. This makes it possible to stabilize the speed of the trailing end portion of the strip after exiting the final stand of the finish rolling mill 1, and prevent the defective winding shape from occurring.

FIG. 3 is an explanatory view showing the situation of the number of rewinding occurrences. The pinch roll 6 and the mandrel 1 after the rear end of the strip has passed through the final stand of the finishing rolling mill 1.
If the control of No. 1 is not properly performed, the winding shape becomes defective as described above, and therefore the strip needs to be rewound from the mandrel 11 and rewound. It can be seen that the rolling before the vertical dotted line in FIG. 3 is according to the conventional technique, and the portion after the dotted line is the case to which the present invention is applied, and the occurrence of rewinding is reduced.

[0024]

Since the present invention is configured as described above, it has the following effects.

In the winding tension control device of claim 1,
In a hot rolling facility that drives each of the pinch roll and the mandrel by current control after the material rolled by the finishing mill is wound on the mandrel via a pinch roll, the material is the finishing mill. Since the control means for switching the mandrel to the speed control is provided after exiting from the position, the material speed can be stabilized and defective winding shape can be eliminated.

In the winding tension control device of claim 2,
Since the speed control of the mandrel is performed based on the speed setting value obtained by adding a predetermined value to the speed actual result,
With simple logic and configuration, control for eliminating defective winding shape becomes possible.

In the winding tension control device of claim 3,
Since the current control of the pinch roll after the material has exited the finish rolling mill is performed based on the tension value of the mandrel, it is possible to perform control for eliminating defective winding shape with a simple logic and configuration. Become.

[Brief description of drawings]

FIG. 1 is a flowchart showing a processing example of winding tension control of the present invention.

FIG. 2 is a configuration diagram showing a winding tension control device and peripheral equipment thereof according to the present invention.

FIG. 3 is an explanatory diagram showing a situation of the number of rewinding occurrences.

[Explanation of symbols]

 1 Finishing rolling mill 2 H table 3 Winding guide 4 Pinch roll 5 Winding guide 6 Pinch roll 7 Pinch roll 8 Pinch roll 9 Winding guide 10 Winding guide 11 Mandrel 12 Mandrel 13 Wrapper roll 15 Wrapper roll 16 Wrapper roll 17 Control Device 18 Metal Detector 19 Metal Detector

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Yoshiaki Fujiwara 1 Kimitsu, Kimitsu-shi, Chiba Nippon Steel Corporation Stock of Kimitsu Steel Co., Ltd.

Claims (3)

[Claims] 1. A hot rolling facility that drives each of the pinch roll and mandrel by current control after the material rolled by a finish rolling mill is wound around the mandrel via a pinch roll. Is provided with a control means for switching the mandrel to speed control after exiting from the finish rolling mill. 2. The winding tension control device according to claim 1, wherein the speed control of the mandrel is performed based on a speed set value obtained by adding a predetermined value to the actual speed. 3. The winding tension control device according to claim 1, wherein the current control of the pinch roll after the material has passed through the finishing mill is performed based on the tension value of the mandrel.