JPH0534089B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a strip edger provided between stands of a finishing mill.

[Prior Art] As shown in FIG. 5, a conventional strip edger generally moves left and right edger rolls b and c, which reduce the width of the strip a, symmetrically with the same pressure to maintain a constant pressure. The width reduction is performed by control or fixed position control.

[Problems to be solved by the invention] However, in the above conventional method, the strip a
If the strip has meandering or camber, the rolling reduction of the edger rolls b and c against the strip a will be unbalanced on the left and right sides, and as a result, only one side will be rolled down excessively in width, resulting in a particularly thin strip a.
In such cases, a defective shape d portion occurs due to buckling, and wear and tear on the edger roll a side, which is subjected to an excessive load, increases, resulting in a shortened lifespan of the device.

The present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to enable stable width reduction without causing buckling or other shape defects in the strip.

[Means for Solving the Problems] The present invention is an attempt to solve the above-mentioned technical problem.The present invention applies a rolling pressure to each of the rolling cylinders that operate the left and right edger rolls for reducing the width of the strip. and a position detector to detect the rolling down device of each edger roll, and a shape detector to detect a change in shape of the width end of the strip on the downstream side of the edger roll of the strip, Providing left and right hydraulic control devices that independently operate the reduction cylinders based on at least one detection signal from each of the detection meters,
A strip presser further comprising a command control device connected to both hydraulic control devices to instruct the securing of the rolling reduction amount and the balance of the left and right rolling forces.
This is related to.

[Function] Therefore, in the present invention, the left and right rolling cylinders are independently controlled based on at least one of the following information: the rolling pressure of the rolling cylinder, the rolling position of the edger roll, and the shape of the width end of the strip after width rolling. As a result, even if the strip has meandering, camber, etc., the left and right pressing forces can be automatically balanced.

[Example] An example of the present invention will be described below with reference to the drawings.

FIG. 1 shows an example of the present invention, in which a hydraulic control device 8, which is equipped with a hydraulic pump 6 and a tank 7, is installed in each reduction cylinder 4, 5 of the edger rolls 2, 3 for reducing the width of the strip 1. Further, a command control device 10 is connected to each of the hydraulic control devices 8 and 9 for introducing signals such as width reduction operation or width reduction amount.

In the above configuration, the pistons 11 and 12 of the respective reduction cylinders 4 and 5 are provided with magnescales 13 and 14, and the magnescales 13 and
Roll position detectors 15 and 16 are provided to detect the positions of the edger rolls 2 and 3 due to the strokes of the reduction cylinders 4 and 5 by detecting the position of the rollers 14 and 14, and the positions detected by the detectors 15 and 16 are Signals 17 and 18 are input to the hydraulic control devices 8 and 9.

Furthermore, pressure gauges 19 and 20 for detecting the reduction pressure are provided in each of the reduction cylinders 4 and 5, and pressure signals 21 and 22 detected by the pressures 19 and 20 are sent to the hydraulic control device 8 and 9 is entered.

In addition, non-contact type shape detectors 23 and 24 are provided downstream of the edger rolls 2 and 3 in the strip 1 to detect the shape of the width end portion of the strip 1. Total 23.2
Shape signals 25 and 26 detected by the hydraulic control devices 8 and 9 are input to the hydraulic control devices 8 and 9, respectively.

The hydraulic control devices 8 and 9 each include the respective detectors 1
The roll gap of the left and right edger rolls 2 and 3 is adjusted separately by operating the left and right reduction cylinders 4 and 5 independently in response to a detection signal from at least one of the rollers 5, 16, 19, 20, 23, and 24. death,
Control so that the left and right pressing forces are always balanced.

FIG. 2 is a graph showing the relationship between the position signals 17, 18 from the roll position detectors 15, 16 and time, and FIG. 3 is a graph showing the pressure signals 2 from the pressure gauges 19, 20.
Figure 4 is a graph showing the relationship between shape signals 25 and 26 from the shape detectors 23 and 24 and time. Since fluctuations occur, it is possible to know that an abnormality has occurred.

In the above configuration, each detector 15, 16, 1
Detection signals 17, 1 from 9, 20, 23, 24
Hydraulic control devices 8 and 9 which input signals 8, 21, 22, 25 and 26 independently control the reduction cylinders 4 and 5 to eliminate the abnormality when there is an abnormality in each signal. Since the command signals from the command control device 10 are input to the hydraulic control devices 8 and 9, while observing the changes in each signal 17, 18, 21, 22, 25, and 26 due to the adjustment of the reduction cylinders 4 and 5, Control is performed so that the commanded reduction amount is ensured and the left and right reduction forces are balanced.

In this way, the rolling forces of the left and right edger rolls 2 and 3 are controlled independently, and the rolling forces of the left and right sides are controlled so as to be balanced, so that the strip 1
Even if there is meandering or camber, the width can be reduced while preventing buckling.

It should be noted that the present invention is not limited to the above-mentioned embodiments, and that the detection method of each detector may be selected from various methods, and various other changes may be made without departing from the gist of the present invention. Of course.

[Effects of the Invention] As described above, according to the strip edger of the present invention, at least one of the rolling pressure of the rolling cylinder, the rolling position of the edger roll, and the shape of the width end of the strip after width rolling is controlled. Since the lowering operation of the left and right lowering cylinders is independently controlled based on the information, even if there is meandering or camber in the strip, the rolling force on the left and right sides is automatically balanced to prevent the occurrence of meandering. , an excellent effect can be achieved in which good width reduction can be performed.

[Brief explanation of drawings]

FIG. 1 is a plan view showing one embodiment of the present invention, and FIG.
The figure is a graph showing changes in the rolling force due to buckling, Figure 3 is a graph showing changes in rolling pressure due to buckling, Figure 4 is a graph showing changes in strip shape due to buckling, and Figure 5 is a graph showing changes in strip shape due to buckling. FIG. 3 is an explanatory diagram of a conventional width reduction method. 1 is a strip, 2 and 3 are edger rolls,
4 and 5 are reduction cylinders, 8 and 9 are hydraulic control devices,
10 is a command control device, 15 and 16 are roll position detectors, 19 and 20 are pressure gauges, and 23 and 24 are shape detectors.

Claims (1)

[Claims] 1 Each of the reduction cylinders that operate the left and right edger rolls for reducing the width of the strip,
A pressure gauge for detecting the rolling pressure and a position detector for detecting the rolling device of each edger roll are provided, and a shape detector is provided for detecting a change in the shape of the width end of the strip on the downstream side of the edger roll of the strip. and left and right hydraulic control devices that operate the reduction cylinders independently in response to at least one detection signal from each of the detectors, and are further connected to both hydraulic control devices to ensure the amount of reduction and the left and right reduction forces. A strip pudger characterized by being equipped with a command control device that commands the balance of the strip.