JPS61249626A - Gap controlling method among levelling roll - Google Patents

Abstract

PURPOSE:To eliminate the inability of biting a rolling material,of levelling and of re-levelling and to increase the efficiency in straightening work by setting with controlling a gap between upper and lower levelling rolls in a proper value by the detected plate thickness of the rolling material to pass a leveller. CONSTITUTION:The upper and lower gap of the levelling roll 6 is controlled with setting in a proper value by detecting 3 the plate thickness of the rolling material 2 passing in the leveller, by actuating a servo valve 5 for hydraulic rolling reduction cylinder with controlling 4 by the signal thereof, the detected value 9 of the rolling reduction cylinder position and the signal of the intermesh set value and by controlling the hydraulic rolling reduction cylinder. With said controlling the inability in biting the rolling material 2,the inability in levelling and relevelling are eliminated and the straightening work is made efficient.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a method for controlling the gap between leveling rolls when leveling a rolled material in a rolling facility.

<Prior art> Leveling of rolled material rolled by the work rolls of a rolling mill is performed by introducing the rolled material between a plurality of leveling rolls, but leveling of rolled material by such a hot leveler is conventional This is carried out by an operator manually setting the gap between the leveling rolls based on the target plate thickness in the rolling schedule table.

In this method, the gap between the leveling rolls is set at the target plate thickness, so if the actual plate thickness to be leveled differs from the target plate thickness, it is possible that the rolled material was not caught or the leveling This may result in cases where the board is passed without being properly inspected.

In other words, if the actual plate thickness is thicker than the target plate thickness,
Trouble may occur due to inability to engage the board, or board bulge due to excessive intermeshed. On the other hand, if the actual plate thickness is smaller than the target plate thickness, leveling becomes impossible or a leveling failure occurs due to lack of intermesh.

In this manner, the conventional manual setting of the gap between the leveling rolls causes the above-mentioned inconveniences and also results in the need to redo the leveling work.

<Problems to be Solved by the Invention> The present invention was made in view of the above-mentioned problems such as the rolled material not being bitten or being passed through without being leveled. It is an object of the present invention to provide a leveling inter-roll gap control method that can set an inter-roll gap.

Means for Solving the Problems In order to achieve the above object, the leveling roll gap control method of the present invention detects the thickness of the rolled material by a detection means before entering the leveler having the leveling rolls, and The present invention is characterized in that a signal is input to the leveling roll control means to control the leveling roll operating means so as to set the gaff between the leveler rolls to an appropriate value according to the plate thickness.

Example of implementation Hereinafter, one embodiment of the present invention will be described based on the drawings.

The figure shows the structure of an apparatus for implementing a leveling roll gap control method according to an embodiment of the present invention, in which a plate thickness measuring device 3 detects the plate thickness of a rolled material 2 rolled by a rolling mill work roll l. , a leveler control device 4 to which a detection signal from the plate thickness measuring device 3 is supplied, and a servo valve 5 for controlling a hydraulic pressure reduction cylinder controlled by the output of the leveler control device 4. A hydraulic pressure reduction cylinder 7 is provided which operates an upper leveling roll 6t which is provided to be able to be raised and lowered among the leveling rolls 6 of the leveler which are arranged above and below with a gap a between the leveling rolls by a control means.

The intermesh setting device 8 is for setting the intermesh b by manual operation by an operator, and its output is applied to the repeller control device 4, and The above hydraulic pressure reduction cylinder 7
is equipped with a reduction cylinder position detection device 9,
The position signal of the hydraulic pressure reduction cylinder 7 obtained from this is also fed back to the repeller control device 4.

Next, the thickness of the rolled material 2 is detected by the above-described device,
The operation of setting an appropriate gap a between leveling rolls in response to this will be explained.

When performing leveling, the thickness of the plate before entering the leveler is first detected, and the signal is fed back to the control system to control the hydraulic reduction cylinder 7. That is, the thickness of the rolled material 2 rolled by the rolling mill work roll 1 is detected by the plate thickness measuring device 3 before entering the leveler, and the signal detected by the plate thickness measuring device 3 is sent to the leveler control device. Enter 4. Further, the operator manually sets the intermesh amount on the intermesh setting device 8, and inputs this to the repeller control device 4.

Next, the position of the hydraulic reduction cylinder 7, that is, the position of the controllable leveling roll 6 above the leveler, is detected by the reduction cylinder position detection device 9. The position signal of the hydraulic pressure reduction cylinder 7 is also input to the repeller control device 4 as a feedback signal. Then, by comparing the plate thickness inputted to the repeller control device 4 with the information regarding the intermesh setting amount and position feedback, the hydraulic reduction cylinder actuator operates the valve 5, which causes the hydraulic reduction cylinder to actuate the valve 5. 7
is controlled, and an appropriate gap a between the leveling rolls is set using the hydraulic reduction cylinder 7.

In this way, according to the above method, the thickness of the rolled material 2 before entering the leveler can be detected, and using this, the gap a between the leveling rolls can always be set to an appropriate value. For this reason, unlike the conventional method, when the thickness of the plate is thick, problems such as inability to bite and bulging of the rolled plate 2 due to excessive intermeshes occur, and conversely, when the plate is thin, leveling is impossible and there is insufficient intermeshes. It is possible to always set the gap a between the leveling rolls to an appropriate value and perform good leveling, and to prevent the rolled material 2 from getting caught or leveling. This eliminates the problem of threading the plate without being removed, which eliminates the need to redo the leveling work and reduces the amount of work for the operator.

<Effects of the Invention> As described above, according to the method for controlling the gap between leveling rolls of the present invention, the gap between leveling rolls can always be set to an appropriate value, so that problems such as the inability to bite rolled material or the inability to level the rolled material can be avoided. It is possible to perform good leveling without causing any trouble, and it is also possible to prevent redoing of the leveling work, so that it is possible to reduce the amount of work.

[Brief explanation of the drawing]

The figure is block 1 showing the structure of a leveling roll implementing a method for controlling the gap between leveling rolls according to an embodiment of the present invention.
It is. In the drawings, 2...rolled material, 3...plate thickness measuring device, 4...
...Leveler control device, 5...Hydraulic pressure reduction cylinder control valve, 6...Leveling roll, 7...Hydraulic pressure reduction cylinder, a...Gap between leveling rolls.

Claims (1)

[Claims] The plate thickness of the rolled material before entering the leveler having leveling rolls is detected by a detection means, and the signal is inputted to the leveling roll control means to set the gap between the leveling rolls of the leveler to an appropriate value according to the plate thickness. A method for controlling the gap between leveling rolls, characterized in that the leveling roll actuating means is controlled as much as possible.