JPH054161B2 - - 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] Conventional strip edgers generally move the left and right edger rolls, which reduce the width of the strip, symmetrically with the same pressure (same speed) and then perform constant pressure control or fixed position control. Therefore, width reduction is performed.

[Problems to be Solved by the Invention] However, in the above conventional method, as shown in FIG. 4, in order to advance the left and right edger rolls a and b at the same speed to perform width reduction, If the strip has meandering or camber, the rolling down of the edger rolls a and b against the strip c will be uneven, and as a result, only one side will be rolled down excessively in width, and especially in the case of a thin strip c, etc. There have been problems in that a defective shape (d) occurs due to bending, and wear and tear on the edger roll (a) side, which is subjected to an excessive load, increases and the life of the device is shortened. In addition, in order to solve this problem, the rolling speed at the start of width rolling is made low so that the edger rolls a and b come into contact with the strip c slowly.
In addition, it has been considered to perform the rolling reduction with an amount that does not cause a defect in the shape of the strip c, but there have been problems such as poor rolling response or failure to obtain the desired rolling amount.

The present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to make it possible to start width reduction at a high response speed without causing defects in the shape of the strip due to width reduction.

[Means for Solving the Problems] The present invention is an attempt to solve the above-mentioned technical problem, and it is an object of the present invention to provide an integral part of each of the edger rolls that performs the width reduction of the strip by means of a reduction cylinder. a width end detection device that moves to detect the width end of the strip, and a switching control device that switches the operation of the reduction cylinder from a high pressure side to a low pressure side based on a width end detection signal of the width edge detection device. A strip bag, which is characterized by
This is related to.

[Function] Accordingly, in the present invention, when width reduction is started, the edger roll is advanced at high speed until it reaches a position at a predetermined distance from the end face of the strip, and thereafter advances at low speed.

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

FIG. 1 shows an embodiment of the present invention, in which left and right edger rolls 4 and 5 move forward and backward to reduce the width of the strip 3 by the operation of reduction cylinders 1 and 2, respectively. Width edge detection devices 6 and 7 are installed to detect both width edge positions of the strip 3 optically, for example, and the width edge detection devices 6 and 7 are installed.
The width end detection signals 8 and 9 are led to separate switching control devices 10 and 11, respectively.

Further, a magnescale 13 is provided on each piston 12 of the reduction cylinders 1 and 2, and the magnescale 12 is detected to control the edger roll 4,
Roll position detectors 14 and 15 detect the position of 5.
are provided to guide the position detection signals 16, 17 of the position detectors 14, 15 to the switching control signals 10, 11. In the figure, reference numeral 18 denotes a command control device that instructs the switching control devices 10 and 11 to send signals such as width reduction operation and width reduction amount.

In the above configuration, when starting width reduction by operating the reduction cylinders 1 and 2 to advance the edger rolls 4 and 5, the switching control devices 10 and 11 operate the respective control devices based on a command from the command control device 18. The reduction cylinders 1 and 2 are operated under high pressure so that the edger rolls 4 and 5 move forward independently at high speed (see FIG. 2).

When the edger rolls 4, 5 move forward and the width edge detection devices 6, 7 that move together with them detect the width edge of the strip 3, the switching control devices 10, 11
After the required time t has elapsed from the time of detection, that is, the distance between the outer peripheral front surface of the edger rolls 4 and 5 and the end surface of the strip 3 reaches the required value L (see Fig. 3).
When this occurs, the operation of the reduction cylinders 1 and 2 is switched to the low pressure side. As a result, the edger rolls 4 and 5 are brought into gentle contact with the end surface of the strip 3, and thereafter width reduction is performed by constant pressure or constant position control.

As mentioned above, the edger rolls 4 and 5 are
Each strip moves forward at a high speed from the width end face of the strip 3 to the required distance L position, and then moves forward at a low speed to be pressed against the end face of the strip 3. This improves responsiveness and allows the left and right edger rolls 4 to move forward at a low speed. ，
The rolling reduction of 5 is always balanced, thus eliminating problems such as uneven contact causing defective parts in the strip. Further, in the above operation, the positions of the edger rolls 4 and 5 are detected by the position detectors 14 and 15, and the signals 16 and 17 are inputted to the switching control devices 10 and 11, so that the positions are monitored. ing.

It should be noted that the present invention is not limited to the above-mentioned embodiments, and that the mounting position of the width end detection device may be set so that the operation of the reduction cylinder is switched to the low speed side at the same time as the width end is detected. It goes without saying that various changes may be made without departing from the spirit of the invention.

[Effects of the Invention] As described above, according to the strip edger of the present invention, at the start of width reduction, the left and right edger rolls are advanced separately at high pressure until they are at the required spacing position with respect to the strip end surface. Since the edger rolls are activated and then operated at a low speed, the response time until rolling starts can be shortened.Furthermore, the left and right edger rolls operate separately, so even if the strip has meandering or camber, it will not hit one side. It is possible to achieve an excellent effect of being able to perform a good width reduction without causing a shape defect.

[Brief explanation of drawings]

Fig. 1 is a front view showing one embodiment of the present invention, Fig. 2 is a front view showing one embodiment of the present invention;
The figure is a diagram showing the relationship between the pressure of the reduction cylinder and time, FIG. 3 is a diagram for explaining the operation of the present invention,
FIG. 4 is an explanatory diagram of the conventional width reduction method. 1 and 2 are compression cylinders, 3 is a strip, 4,
5 is an edger roll, 6 and 7 are width edge detection devices,
10 and 11 are switching control devices, 13 is a Magnescale, 14 and 15 are position detectors, and 18 is a command control device.

Claims (1)

[Claims] 1. Each of the edger rolls that reduce the width of the strip by a reduction cylinder is provided with a width edge detection device that moves together with the edger roll to detect the width edge of the strip, and A strip edger characterized in that a switching control device is provided for switching the operation of the reduction cylinder from a high pressure side to a low pressure side based on a width end detection signal.