JPH0289514A - Hot rolling method - Google Patents

Abstract

PURPOSE:To enable measuring a meandering value accurately and to enable correcting the meandering accurately by opening a side guide during plate rolling and detecting the meandering of the plate at that time. CONSTITUTION:The plate 1 to be rolled on each rolling stand 2 is restricted by the side guide. 3. After starting the rolling, at the starting time for coiling the front end of the plate on a down coiler, the guide 3 is moved from an off state position A shown by a full line to an on state position B shown by a dotted line. Then, the meandering value is measured by a meandering detector 4, based on its detected value, leveling is performed to correct the meandering. After that, during the normal rolling, the sideguide 3 is held on the on state position B, to make to return to the off state position A before the rear end passes through each stand. By this method, the meandering of the plate during rolling is grasped accurately, and through this correcting, lowering of the yield caused by generating the double folding of the tail end and roll flaws are prevented.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a hot rolling method.

[Prior Art] Meandering during rolling in a conventional hot rolling mill is indicated by a meandering sensor or a difference in rolling load between the drive side and the rolling side.

[Problems to be Solved by the Invention] In conventional meandering detection, the plate being rolled is actually restrained by side guides built into the front, back, left and right sides of the rolling mill, so the detected values are not accurate. therefore,
When the tail end of the material to be rolled passes through the hot rolling mill, the tail end meanderes and hits the side guide, folding it into two pieces, which are then rolled and create scratches on the roll, which are then transferred to the subsequent plate. This often occurs. Further, there were problems such as the occurrence of bending (camber) in the sheet metal body.

[Means for Solving the Problems] The hot rolling method according to the present invention includes a side guide that can be freely opened and closed on the entry side and/or exit side of the rolling stand, and a side guide that is disposed adjacent to the rolling stand and/or the rolling stand. A meandering amount detector is installed, the side guide is opened during rolling,
The amount of meandering of the material to be rolled depending on the rolling conditions at that time is detected by the detector, and based on the detected value, the rolling stand is adjusted to the left and right to reduce the amount of meandering, and then the side guides are closed and rolling is performed. This is a hot rolling method characterized by continuing.

[Function] In the method of the present invention, the side guide is opened during plate rolling and the meandering of the plate at that point is detected, so it is possible to accurately measure the amount of meandering, and therefore the meandering amount can be measured based on the detected value. Accurate meandering correction becomes possible.

Embodiment FIGS. 1(a) and 1(b) are diagrams showing an embodiment of a hot rolling mill used in the hot rolling method of the present invention.

In the figure, the plate 1 rolled by each rolling stand 2 is restrained by side guides 3.

After the start of rolling, when the tip of the plate starts winding around the down coiler, the side guide 3 is moved from the closed state position A shown by the solid line to the open state position B shown by the dotted line.
It is desirable that the distance between A and B be as small as possible for upstream stands and as long as possible for downstream stands. The reason for this is that in the upstream stand, the material to be rolled is thick and there is no risk of buckling due to contact with the side guide, but in the downstream stand, the material is thin and this type of buckling is likely to occur. .

After that, the amount of meandering is measured by the meandering detector 4, and leveling (operating the reduction screws on the drive side and the rolling mill side to correct the levelness of the rolling roll) is performed based on the detected value to correct the meandering. . Thereafter, during steady rolling, the side guide 3 is held at the open position B, and returned to the closed position A before the tail end passes through each stand. Here 2
The dashed dotted line indicates a backup roll. In this embodiment, the side guide is returned to its closed position before the tail end is removed, but it may be performed during steady rolling depending on the situation. In addition, in this example, a sensor is used as a meandering detector, but the drive side of each stand,
Unilateral elongation may be determined based on the difference in rolling load on the operator side.

[Effects of the Invention] As described above, according to the present invention, it is possible to accurately grasp the meandering of the plate during hot rolling, so it is possible to correct the meandering of the plate, and it is possible to prevent double folds and roll defects at the tail end of camber 1. It is possible to prevent a decrease in yield due to this occurrence and a decrease in efficiency due to roll rearrangement.

[Brief explanation of drawings]

FIGS. 1(a) and 1(b) show an embodiment of a hot rolling mill used in the hot rolling method of the present invention, and FIG. 1(a) is a side view thereof;
The figure (b) shows the main part of the plane. 1...Plate, 2...Rolling stand, 3...Side guide, 4...Meandering detector.

Claims (1)

[Claims] A side guide that can be opened and closed is provided on the entry side and/or exit side of the rolling stand, and a meandering amount detector is provided in the vicinity of the rolling stand and/or the rolling stand, and the side guide is opened during rolling to detect the The amount of meandering of the rolled material according to the rolling conditions at that time is detected by the detector, and based on the detected value, the rolling stand is adjusted to the left and right to reduce the amount of meandering, and then the side guides are closed and rolling is performed. A hot rolling method characterized by continuing.