JPH09314227A - Winding control method and device for rolled material winder - Google Patents

Abstract

(57) [Summary] (Correction) [Problem] Only by changing the pressing pressure of the trumpet roll, the top end mark is prevented from occurring and the device price is reduced.
A trumpet roll device for winding rolled material that can simplify the control circuit. SOLUTION: The winding machine has a mandrel for winding a rolled strip and a trumpet roll 4 for pressing the strip on the mandrel, and a winder for winding the strip, and a control device for controlling the pressing pressure of the trumpet roll. And a position setting device that forms a trumpet roll position signal by setting the position where the tail end of the strip passes the position of the trumpet roll according to the rotation of the mandrel, and the trumpet roll position signal from this position setting device. A winding control device for a rolled material winding machine, comprising: a signal forming device which outputs a low pressure output to the control device when it is supplied and a high voltage output when it is not supplied.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a winder having a mandrel and a plurality of trumpet rolls for manufacturing rolled material (hereinafter referred to as strip) in the steel industry and winding the rolled material, In particular, it relates to a device for controlling the operation of a trumpet roll.

[0002]

2. Description of the Related Art A slab manufactured by a continuous casting facility is heated and soaked by a heating device called a heating furnace or soaking furnace to a temperature suitable for rolling, and then a rough rolling machine (coarse pressure heating machine is used). (Some facilities do not have this) and a finishing mill are used to roll to the target plate thickness.

The hot strip rolled by the finish rolling mill is transported by a transport device called a hot run table, and is water-cooled at that portion so as to have the material characteristics required for the rolled material. The hot strip conveyed while being water-cooled is wound into a coil shape by a winder constituted by a mandrel and a plurality of trumpet rolls, and is transferred to the next step.

This winding machine has a large size due to an increase in the thickness of the rolled material or variations in the rolled material, a low temperature extraction aiming at a process-saving effect, an increase in a low temperature winding tendency, or an increase in a speed-up tendency. And speeding up.

Due to the increase in size of the mandrel and the trumpet roll accompanying the increase in size of the winding machine, a flaw called a top-end mark, which has not been a problem so far, has become a problem. This remarkably appears at the tip end portion of the hot strip, which causes deterioration of product quality and yield.

The top end mark is generated at the tip end of the hot strip when the hot strip conveyed by the hot run table is wound around the mandrel by the mandrel and the trumpet roll. Then, the second and subsequent windings have a stepwise winding shape, and at this stepped position (hereinafter referred to as a step position), interference with the trumpet roll that is always pressed with a constant pressure, that is, the trumpet roll is at the step position. By colliding with, the top end mark is generated on the inner surface in contact with the leading and trailing ends of the hot strip being wound. In particular, the range within several windings after the start of winding becomes a problem.

FIG. 4 shows a conventional trumpet roll device for winding rolled material for solving these problems. Hot strip 1 rolled by a finish rolling mill (not shown)
Is conveyed by a hot run table (not shown), passes through a pinch roll 2, reaches a winder constituted by a mandrel 3 and a plurality of trumpet rolls 4, and is wound into a coil.

In this case, the hot strip 1 conveyed between the finishing rolling mill and the mandrel 3 or between the pinch roll 2 and the mandrel 3 is wound so that the conveyed hot strip 1 is securely wrapped around the mandrel 3. 1
Control is performed to apply tension to. At the same time, the hot strip 1 is pressed onto the mandrel 3 by the action of the trumpet roll 4 having the hydraulic cylinder 6 whose operation is controlled by the hydraulic servo valve 5.

Here, as described above, the tip end portion (see FIG.
In order to prevent the top end mark generated in the "A" part, the trumpet roll 4 is controlled by the control system shown in FIG. That is, the trumpet roll 4 is normally pressed and controlled by the mandrel 3 with a constant pressure, and when the tip end of the hot strip 1 passes through the position of the trumpet roll 4, the pressure oil servo valve 5 is moved from the pressure control position. By switching to control and operating, hot strip 1
The step position of the leading and trailing end of the above does not collide with the trumpet roll 4.

The hydraulic cylinder 6 has a position detector 7 for detecting the cylinder position, an inlet pressure detector 8 for detecting the inlet pressure of the hydraulic cylinder 6, and an outlet side for detecting the outlet pressure. A pressure detector 9 is provided, and constitutes a closed loop control system which uses each detection signal of these detectors as a feedback signal for a pressure reference or a position reference.

FIG. 6 shows an operation chart when the trumpet roll 4 is controlled by such a control configuration, taking a certain one trumpet roll (here, the No. 1 trumpet roll) as an example. As can be understood from FIG. 6, the tip end portion of the hot strip 1 has NO. 1 Within the range of passing the trumpet roll, the trumpet roll 4 is switched from the pressure control to the position control, the trumpet roll 4 is jumped so as to prevent the interference with the step position, and the tip end portion is repositioned by the completion of passing. By switching from control to pressure control, control is performed to prevent the top end mark and to generate a firm winding force around the mandrel.

Here, the tip end position of the hot strip 1 is accurately calculated by tracking by a position detector (not shown) attached to the pinch roll 2 or mandrel 3. Here, NO. Although only one trumpet roll is described, the same control method as described above is applied to each trumpet roll also for a plurality of other trumpet rolls.

[0013]

As described above, according to the present method, it is effective against the contradictory phenomena of preventing the top end mark and firmly winding around the mandrel.

However, a complicated switching function between pressure control and position control, a controller capable of high-speed processing for accurately performing them, or a servo valve with high response, a control with a highly accurate tracking function, etc. As a result, the circuit becomes complicated, the price becomes high, and the adjustment start-up period becomes long.

The present invention has been made in consideration of the above-mentioned problems, and has a simple structure and can effectively prevent the occurrence of top end marks, reduce the device cost, and simplify the control circuit. It is to provide a trumpet roll device for use.

[0016]

DISCLOSURE OF THE INVENTION According to the present invention, a hydraulic servo valve for controlling the pressing pressure of a trumpet roll, an inlet side pressure detector and an outlet side pressure detector are arranged in a hydraulic cylinder section, and a detection signal thereof is provided. Is used as a feedback value, and when the leading end of the hot strip passes through the trumpet roll part, the pressing pressure reference value of the trumpet roll is used as a low pressure reference, and the feedback value is used so as to match the low pressure reference value. The present invention provides a trumpet roll device for winding rolled material, which is configured to perform closed loop control.

In this apparatus, when the tip end of the hot strip passes through the trumpet roll, the pressing pressure of the trumpet roll is set to a low pressure, and when the passing of the tip end is completed, it is returned to the high pressure pressing to wind the hot strip. Carry out work.

[0018]

1 is a control circuit diagram of the present invention, FIG. 2 is a timing chart showing the operation of a trumpet roll when the present invention is implemented, and FIG. 3 is a trumpet having three winding machines. 6 is a timing chart showing the operation of each trumpet roll when it is assumed that the trumpet rolls are provided.

In FIG. 1, the pressure applied to the mandrel of the trumpet roll 4 is controlled by a hydraulic servo valve 5 via a hydraulic cylinder 6. Further, the hydraulic cylinder 6 is provided with an inlet pressure detector 8 and an outlet pressure detector 9, and those detector signals are used as feedback values.

That is, when a predetermined pressure reference value is input, the hydraulic servo valve 5 drives the hydraulic cylinder 6 to control the pressing pressure of the trumpet roll 4, and the inlet side provided in the hydraulic cylinder 6 is controlled. Pressure detector 8
After both detection signals of the output pressure detector 9 and the output pressure detector 9 are compared and calculated, they are used as a feedback value to the pressure reference value to form a closed loop of the pressure control circuit.

Here, each winding machine is provided with a plurality of trumpet rolls. Each of the trumpet rolls is provided with a control circuit as shown in FIG. 1, and the pressing pressure of each trumpet roll is controlled at each individual timing.

Next, the operation of one (NO.1 trumpet roll) trumpet roll will be described with reference to the operation timing chart of the trumpet roll shown in FIG.

FIG. 2 shows each operation timing in the process in which the hot strip rolled by the finish rolling mill reaches the winder through the hot run table and the pinch rolls and is wound around the mandrel. Then, the step position of the leading end portion of the hot strip of the second roll following the first roll is NO. When passing under the lower part of the trumpet roll 1, the pressing pressure of the trumpet roll is controlled to be low pressure, so that the NO. The position of one trumpet roll follows the trajectory along the step position. Then, after the passage of the step position is completed, the high pressure control is performed again to make the winding of the hot strip around the mandrel reliable.

That is, the low pressure means a pressure of a value that allows the trumpet roll to follow the locus along the step position, and the high pressure means a pressure of a value at which the hot strip can be reliably wound around the mandrel.

After that, the low pressure control is repeated every time the step position is passed, and when the number of turns of the top end mark is such that it does not cause a problem, the switching operation from the high pressure control to the low pressure control is completed, After that, the winding operation is executed by the limited high pressure control.

Further, since the winding machine is often equipped with a plurality of trumpet rolls, the operation of pressure switching between the trumpet rolls will be described with reference to FIG. The timing will be described.

As shown in FIG. 3, three trumpet rolls,
That is, NO. 1 trumpet roll, NO. 2 trumpet roll and NO. Suppose there are 3 trumpet rolls. The step position passing range of each trumpet roll is 120 °
And low pressure control for 120 °, and other 2
High pressure control is performed in the range of 40 °, and by making the low pressure switching timing between the trumpet rolls have a phase difference of 120 °, two of the three units are always in high pressure control and the winding operation is performed. However, the remaining one is an operation chart in which low pressure control is performed because the step position is passed.

[0028]

As described above, according to the present invention, when the leading end of the hot strip passes through the step position, the pressing pressure of the trumpet roll is switched from the high pressure control to the low pressure control, so that the structure is simple and the cost is low. In addition, the circuit configuration can be adjusted easily, and the reduction of the top end mark can prevent surface flaws, improve the winding shape, and improve the yield.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a control circuit according to an embodiment of the present invention.

FIG. 2 is a timing chart showing the operation of the trumpet roll when the present invention is implemented.

FIG. 3 is a timing chart showing the operation of each trumpet roll in the present invention when three trumpet rolls are installed in the winder.

FIG. 4 is a diagram showing an overall configuration of a conventional winding machine.

FIG. 5 is a diagram showing a conventional trumpet roll control circuit.

FIG. 6 is a timing chart showing the operation of a conventional trumpet roll.

[Explanation of symbols]

 1 Hot Strip 2 Pinch Roll 3 Mandrel 4 Wrapper Roll 5 Hydraulic Servo Valve 6 Hydraulic Cylinder 7 Position Detector 8 Inlet Pressure Detector 9 Outlet Pressure Detector

Claims (4)

[Claims] 1. A winding control method for a rolled material winding machine that winds a rolled strip on a winding mechanism composed of a mandrel and a trumpet roll, wherein a pressing pressure of the trumpet roll against the mandrel is provided. To
A winding control method for a rolled material winding machine, characterized in that the leading end of the wound strip is reduced at the timing of passing the trumpet roll part. 2. The winding control method for a rolled material winding machine according to claim 1, wherein the pressing pressure reduction period is within a predetermined rotation angle range set during one rotation of the mandrel. Winding control method of machine. 3. A winder for winding the strip, comprising a mandrel for winding the rolled and formed strip, and a trumpet roll for pressing the strip on the mandrel, and a control device for controlling the pressing pressure of the trumpet roll. And a position setting device that forms a trumpet roll position signal by setting a position where the tail end of the strip passes the position of the trumpet roll according to the rotation of the mandrel, and a trumpet roll position signal from the position setting device. A winding control device for a rolled material winding machine, comprising: a signal forming device that gives a high-voltage output to the control device when it is not applied at a low pressure. 4. The apparatus according to claim 3, wherein the signal forming device has a rolled material winding control device within a predetermined rotation angle range set during one rotation of the mandrel.