JPH0129603B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for controlling the gap setting of a pinch roll for guiding hot strip to a coiler mandrel.

(Prior Art) FIG. 3 shows a front view of a coiler from the exit side of a conventional finishing rolling mill. In the figure, 1 is a mandrel, 2 is a lower pinch roll, 3 is an upper pinch roll, and 13 is a finishing mill.

The hot strip rolled in a hot continuous rolling mill is wound up by a coiler (winding machine) installed at the end of the rolling line, but in this case, the hot strip is wound up by a pinch roll installed before the coiler. You will be guided there. For example,
As shown in Publication No. 16232, the pinch rolls are used to (1) feed the tip of the hot strip sent from the finishing rolling mill to the mandrel of the coiler, and (2) feed the tip of the hot strip sent from the finishing rolling mill to the finishing rolling mill via the mandrel and the pinch roll. If the winding tension of the strip maintained between the pinch roll and the mandrel is lost when the rear end of the strip leaves the finishing mill, the total tension is transferred between the pinch roll and the mandrel. The main purpose of this equipment is to keep the strip between It will be done.

(Problem to be solved by the invention) By the way, the pinch roll has an initial curve, the strip has a normal profile and there is no plate bending, and the gap of the pinch roll is normal on both the work side and the drive side. If so, the strip should be guided with the proper force and the coil should be wound tightly. However, as the number of rolls increases, the curve of the pinch roll changes over time due to wear with the strip. Furthermore, as the number of rolls increases, the pinch roll body also becomes loose, and the gaps between the upper and lower pinch rolls may no longer be parallel. Furthermore, when the strip profile is not uniform on the left and right sides and is in a so-called wedge state, the pinch roll gaps are relatively non-parallel. In particular, if the left and right sides of the upper and lower pinch roll gap are not parallel when the end of the strip leaves the finishing mill, the winding shape will be disordered, often resulting in curved edges, cracked edges, dents, and scratches.

Furthermore, the judgment as to whether the gap of the pinch roll is appropriate for the strip currently relies on the operator's visual observation, that is, on his or her intuition.

This invention was made in order to solve the above-mentioned problems, and it is possible to obtain a good winding shape, eliminate quality problems such as bent edges, cracked edges, dents, and scratches, and improve operator comfort. The aim is to obtain a method that does not require manual intervention, that is, can be automated.

(Means for Solving the Problems) The present invention provides a winding pinch roll that feeds the tip of a hot strip sent from a finishing mill of a continuous hot rolling mill to a mandrel of a coiler and holds the strip at an appropriate tension until the end. In this control method, a load detector is installed between the upper and lower pinch rolls to measure the reaction force on the work side and drive side of the pinch roll, and the gap between the upper and lower pinch rolls is adjusted to reduce the difference in reaction force during sheet threading. This is a winding-up pinch roll control method characterized by setting and controlling. In addition to this control during strip threading, the strip profile on the exit side of the finishing rolling machine is measured, and based on this measurement, the initial gear settings of the upper and lower pinch rolls are determined before the strip reaches the pinch rolls. It is even more effective if you do this.

(Function) The reaction force is measured by installing a load detector between the upper and lower pinch rolls, for example, by installing load cells on the screw jacks on both sides of the pinch rolls, that is, on the work side and the drive side. The reason why the reaction force is actually measured is to control the gap based on the measured reaction force to prevent the adverse effects caused by the above-mentioned causes of the strip and pinch roll, such as the strip having an abnormal profile.

Based on this measured value, the gap between the upper and lower pinch rolls is set and controlled independently on both sides so that the reaction force is basically equal on both sides and the fluctuation of the reaction force during sheet threading is reduced. This can be done automatically using, for example, a DDC calculator based on the actual measured values of the reaction force and gap.

Furthermore, regarding the initial setting of the gap, it is more effective to measure the profile of the strip when it leaves the finishing mill and set it based on the actual value, rather than based on the target finishing thickness. be. This makes it possible to guide and wind up the strip with a more appropriate gap from the tip.

(Example) Hereinafter, an example of the present invention will be described based on the drawings.

1 in FIG. 1 is a mandrel provided at the terminal end, and a strip A is provided in front of this mandrel 1.
A lower pinch roll 2 for guiding the lower end of the strip and an upper pinch roll 3 for guiding the upper side of the strip are installed above the lower pinch roll. Both pinch rolls 2 and 3 are mounted on a universal spindle (not shown). It is designed to be driven by a motor via a

Further, the upper pinch roll 3 is fixed to a frame 4, and a cushion 7 for receiving a screw jack 5 is attached to the tip of the frame 4.

Conventionally, the gap between the upper and lower pinch rolls is adjusted and set according to the finished thickness of the strip A to be rolled. This gap adjustment is carried out by setting the screw jack 5 for setting the interval to an appropriate length, and using the cushion 7 for adjusting the interval to adjust the frame 4.
This is done by holding the cushion 7 and the screw jack 5 in contact with each other by pulling the cushion 7 downward with the cylinder 8. This gap amount is indicated to the operator's cab by a celsyn (remote display and conversion device).

In this embodiment, the screw jack 5
A load cell 6 is installed to detect the reaction force.

First, the gap of the pinch roll is initially set according to the target plate thickness. Then, the reaction force 14 is measured by load cells 6 provided on the screw jacks 5 on both sides. The measured reaction force 14 is sent together with the pinch roll gap 15 to the control device 20. The control device 20 uses, for example, a DDC computer to reduce the difference in reaction force on both sides.
In addition, gap correction 21 of the upper and lower pinch rolls is performed independently on both sides so that fluctuations in reaction force during sheet passing are reduced.

Further, it is more effective to set the initial gap based on the strip profile at the exit side of the finishing rolling mill. In this case, a fixture thickness gauge 10 and a scan thickness gauge 1 are provided on the exit side of the finishing rolling mill 13.
1. Measure the center thickness 17, width direction thickness 18, width 19, etc. using a width gauge 12, etc., and measure the center thickness 17, width direction thickness 18, width 19, etc.
0 and set the initial gap. Gap control after the strip tip passes the pinch roll is performed based on reaction force measurement as described above.

(Effects of the Invention) According to the method of the present invention, the gap is corrected by actually measuring the reaction forces on both sides of the pinch roll. It is also possible to effectively control the backlash of the support device, obtain a good rolled shape, and prevent the occurrence of bending of the edges. When setting the initial gap of the pinch rolls based on the actual measured value of the strip profile at the exit side of the finishing mill, it is possible to set the gap more appropriately from the tip of the strip.

Moreover, according to this method, it becomes possible to automate the process that conventionally relied on the intuition of an operator.

[Brief explanation of drawings]

Figure 1 is a front view of the coiler from the exit side of a finishing rolling mill, Figure 2a is a front view of the pinch roll, Figure b is a view showing details of the load cell section, and Figure 3 is a front view of the exit side of a conventional finishing rolling mill. It is a front view of a coir. 1...Mandrel, 2...Lower pinch roll, 3
... Upper pinch roll, 4 ... Frame, 5 ... Screw jack, 6 ... Load cell, 7 ... Cushion, 8 ... Cylinder, 9 ... Cylinder for position movement, 10 ... Fixture thickness gauge, 11 ...
...Scan thickness gauge, 12...Width gauge, 13...Finishing rolling mill, 14...Reaction force, 15...Gap, 16
... Speed of lower pinch roll, 17 ... Center thickness, 18 ... Width direction thickness, 19 ... Width, 20
...Control device, 21...Gap correction, 22...
Base frame, A... strip.

Claims (1)

[Scope of Claims] 1. A method for controlling a take-up pinch roll that feeds the tip of a hot strip sent from a finishing mill of a continuous hot rolling mill to a mandrel of a coiler and holds the strip at an appropriate tension until the end, comprising: A load detector is installed between the rolls to measure the reaction force on the work side and drive side of the pinch roll, and the gap between the upper and lower pinch rolls is set and controlled to reduce the difference in reaction force during sheet threading. A winding pinch roll control method. 2. In a method for controlling a take-up pinch roll that feeds the tip of a hot strip sent from a finishing mill of a continuous hot rolling mill to a mandrel of a coiler and maintains the strip at an appropriate tension until the end, the strip on the exit side of the finishing rolling mill is Measure the profile, set the initial gap between the upper and lower pinch rolls based on this measurement, install a load detector between the upper and lower pinch rolls, measure the reaction forces on the work side and drive side of the pinch rolls, A winding pinch roll control method characterized by setting and controlling a gap between upper and lower pinch rolls so as to reduce the difference in reaction force during sheet threading.