JPH05104143A - Device for controlling of continuous hot strip mill - Google Patents

Abstract

PURPOSE:To control the violent tension variation to the rolling line by arranging a looper mechanism at a fomaer stage of a cutting machine for cutting a tail end of a wound coil, and controlling. CONSTITUTION:At the former stage of a pinch roll of a coiler, more two stands of pinch rolls 7, 8 and a looper mechanism between the above two stands are provided. The loop of a rolled stock 10 is formed by pushing-up the down surface of the rolled stock 10 with the looper roll of the looper mechanism. The speed of the pinch roller 8 is controlled so that the tension of rolled stock is become constant by measuring the load and the acceleration of the looper roll 13 with a load meter 14 and the acceleration meter 15. The impact tension of the rolled stock 10 generating at the cutting time is absorbed by stopping the control of the looper mechanism and dropping-down the looper arm 16 just before the coil is reached to the length to be cut and is cut.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to rolling equipment for a continuous hot strip mill, and more particularly to a rolling control device for a continuous hot strip mill equipped with a coiler tension control device for controlling tension when winding rolled material. ..

[0002]

2. Description of the Related Art A conventional hot strip mill facility is shown in FIG.
Will be described. As shown in the figure, in the continuous hot strip mill facility, rolling is continuously performed from the continuous casting facility to the coiler, and two or three rolling mills are used to flow the rolled material without interruption into a coiled molded product in the next process. Using the coiler 4 on the stand, use the pinch roll 3 before the winding is completed.
The rolled material is cut by the cutting machine 2 in the preceding stage, and the tip end of the rolled material after cutting is wound around the other coiler, whereby coiled products are alternately formed by each coiler.

[0003]

By the way, in the case of the conventional continuous hot strip mill equipment as described above, the shocking tension is generated between the finish rolling mill and the coiler side pinch roll at the time of cutting the coil tail end before the winding is completed. Since this occurs, necking occurs in the rolled material, so that there is a problem that a uniform molded product cannot be obtained and the yield decreases.

The present invention has been made to solve the above problems, and its purpose is to suppress the generation of impact tension at the time of cutting a rolled material and to improve the quality of a coil molded product. It is to provide a rolling control device for a mill.

[0005]

In order to achieve the above object, the present invention relates to a rolling facility of a continuous hot strip mill having a rolling line for continuously rolling a rolled material from a continuous casting facility to a coiler. A looper mechanism is arranged in front of the cutting machine for cutting the tail end of the coil, and by controlling the looper mechanism, the loop of the rolled material absorbs the impact tension generated when the tail end of the coil is cut, It is characterized in that it is configured to suppress a rapid change in tension with respect to the line.

[0006]

In the rolling equipment of the continuous hot strip mill of the present invention, the looper mechanism is arranged in front of the cutting machine for cutting the tail end of the coil, and loops are previously generated in the rolled material during winding of the coiler. By lowering the looper immediately before the cutting, the impact tension generated at the time of cutting the tail end of the rolled material is absorbed by this loop portion, so that it is possible to suppress a sudden tension fluctuation to the rolling line.

[0007]

Embodiments of the present invention will be described with reference to the drawings. FIG. 2 is a schematic configuration diagram of a continuous hot strip mill rolling line according to an embodiment of the present invention. As shown in the figure, in the present embodiment, two pinch rolls 7 and 8 and a looper mechanism 9 between the two pinch rolls are provided in front of the conventional coiler pinch rolls. The looper is raised during winding of the coiler by 9 to form a rolled material loop between the pinch rolls 7 and 8, and the looper is lowered before cutting the rolled material to lower the loop between the pinch roll 7 and the coiler side pinch roll 3. The tension is lowered to absorb the shocking tension when the rolled material is cut.

FIG. 1 is a block diagram of a rolling control device according to an embodiment of the present invention. A looper mechanism 9 in the preceding stage of a cutting machine is a looper roll 13 that contacts the lower surface of a rolled material 10, while rotating the looper roll 13. A so-called electric looper is provided, which is composed of a looper arm 16 that is freely supported and a looper driving electric motor 17 that can change the angle θ of the looper arm 16 with respect to the horizontal line.

Next, the operation of the looper mechanism 9 will be described. First, the end of the rolled material is the pinch roll 3 on the coiler side.
The pinch roll 7 at the front stage of the looper and the pinch roll 8 at the rear stage of the looper are operated in synchronism with the finish rolling mill 1 until they pass through. Next, the looper roll 13 is raised before the tip is wound around the coiler, and the looper angle θ corresponding to the looper height is set so as to generate a loop of the rolled material.
The looper mechanism 9 is controlled as follows.

The electric motor 11 for driving the pinch roll 8 is
Although the speed is controlled by the speed controller 12, the output of the load meter 14 installed on the lower surface of the looper roll 13 and the axis of the looper roll 16 in order to match the rolling material tension and the loop amount between the pinch rolls to the target values at this time. The tension detector 22 calculates and detects the rolling material tension based on the output of the accelerating clock 15 attached to the pinch roll 8 and the tension controller 23 sets a speed reference that causes the tension detection value to follow the tension target value. While controlling the speed of the electric motor 11 by applying it to the speed control device 12 of the position detector 2, the position detector 2
When 0 calculates and detects the looper height corresponding to the looper angle θ, the looper height control device 21 gives a speed reference to the speed control device 19 so that the looper height detection value follows the looper height target value. The speed of the drive motor 17 is controlled. The electric motor 11 that drives the pinch roll 7 is operated as it is in synchronization with the finish rolling mill 1.

Next, the control of the looper mechanism 9 is stopped immediately before the coil reaches the cutting length and cutting is performed, and the looper arm 16 is stopped.
To absorb the impact tension generated when cutting the rolled material.

[0012]

As described above, the rolling equipment of the continuous hot strip mill of the present invention has a looper mechanism installed in front of the cutting machine for cutting the tail end of the coil, and the rolled material is preliminarily used during coiling. By creating a loop in the loop and lowering the looper immediately before cutting the rolled material, the impact tension generated when the tail end of the rolled material is cut is absorbed by this loop portion, so sudden tension fluctuations to the rolling line are suppressed. That is, it has an excellent effect.

[Brief description of drawings]

FIG. 1 is a block diagram of a rolling control device according to an embodiment of the present invention.

FIG. 2 is a schematic configuration diagram of a continuous hot strip mill rolling line of the present invention.

FIG. 3 is a schematic configuration diagram of a conventional continuous hot strip mill rolling line.

[Explanation of symbols]

1 ... Finishing rolling mill, 2 ... Cutting device, 3, 5 ... Pinch roll,
4, 6 ... coiler, 7, 8 ... pinch roll, 9 ... looper mechanism, 13 ... looper roll, 10 ... rolled material, 11 ... electric motor, 12 ... speed control device, 14 ... load cell, 15 ... acceleration clock, 16 ... looper arm , 17 ... electric motor for driving the looper,
18 ... Pulse generator, 19 ... Speed control device, 20
... position detector, 21 ... looper height controller, 22 ... tension detector, 23 ... tension controller.

Claims (1)

[Claims] 1. In a rolling facility of a continuous hot strip mill having a rolling line for rolling rolled material continuously from a continuous casting facility to a coiler, a looper mechanism is provided in front of a cutting machine for cutting the tail end of a wound coil. Is arranged and the looper mechanism is controlled so that the loop of the rolled material absorbs the impact tension generated at the time of cutting the tail end of the coil and suppresses the rapid fluctuation of the tension with respect to the rolling line. Rolling control device for continuous hot strip mill.