JP2021171794A - Side guide of hot rolling equipment and hot-rolled steel strip winding method - Google Patents

Abstract

To provide a side guide which enables winding of a steel strip (strip) after hot rolling on a mandrel in a stable shape even if axes of a pinch roll and a mandrel are not orthogonal to a center line of a hot run table, and to provide a coil winding method for the strip with use of the side guide.SOLUTION: Side guides are located as a pair on both sides in an axial direction of a hot run table on an inlet side of a winding device of hot rolling equipment for manufacturing a hot-rolled steel strip, arrest a side face of the steel strip and guide the steel strip to the winding device. Distances of the side guides on both sides from center lines on an upstream side and a downstream side of the hot run table can be controlled independently, and a displacement magnitude of the side guide from the center line and an inclination angle of each side guide to the center line are controlled separately to wind the hot-rolled steel strip.SELECTED DRAWING: Figure 7

Description

The present invention is installed on the entrance side of a winding facility for winding a rolled hot-rolled steel strip (strip) on a coil in a hot-rolled facility for manufacturing a hot-rolled steel strip, and serves as a side guide for guiding the strip to a mandrel. The present invention relates to a method for winding a hot-rolled steel strip using the above-mentioned side guide equipment.

In a hot rolling facility that manufactures hot-rolled steel strips, a steel slab, which is a raw material, is rolled into a sheet bar with an intermediate plate thickness by a plurality of rough rolling machines, and then the sheet bars are arranged in succession by a plurality of rolling mills. After rolling to a desired plate thickness with a tandem continuous finishing rolling mill, the strips exiting the finishing rolling mill are conveyed on a hot run table and cooled to a predetermined temperature with cooling water. It is introduced into the winding equipment via a pinch roll and wound on a coil by a mandrel, which is a winding shaft.

On the entry side of the pinch roll, on both sides in the width direction of the hot run table that conveys the strip, in order to prevent the strip that is being wound around the coil from meandering and to prevent the wound coil from becoming telescopic. Is usually equipped with one or more pairs of side guides.

It is desirable that the side guides are arranged parallel to both sides in the width direction with respect to the center line of the hot run table from the viewpoint of allowing the strip to enter perpendicular to the axes of the pinch roll and the mandrel. In addition, the side guides installed as a pair on both sides in the width direction are transported to the winding facility at the center in the width direction of the hot run table when the strip is not meandering, so that the side guides are transported from the center line of the hot run table to both sides. It is desirable that they are installed at equal distances. Therefore, it is desirable that the side guides are controlled so as to be symmetrical with respect to the center line of the hot run table.

However, the side guide equipment cannot deal with the case where the strip is meandering. Therefore, some side guide equipments have been proposed. For example, in Patent Document 1, in order to prevent telescope of the take-up coil generated at the rear end of the rolled material that has slipped out of the final finishing rolling mill, the rolled material that enters the take-up machine from the finishing rolling mill is described. A pair of parallel guides that are arranged facing each other across the rolling line and guide one in position controllable and the other in pressure controllable, and the parallel guides are rolled forward and backward in the direction perpendicular to the plate width of the rolled material. A hydraulic side guide control device equipped with a hydraulic cylinder for centering the material and a pressure control device for continuously entering the winder while relaxing the contact load when the rolled material comes into contact with the parallel guide has been proposed. ..

Further, in Patent Document 2, in the winding equipment provided in the order of the side guide, the pinch roll, and the coiler from the upstream side of the line, the position of the most downstream side of the side guides on which the metal band can be restrained is defined as a. The position of the intermediate point between the position a and the pinch roll reduction point is b, the distance between the position a and the position b is L, and the position in the side guide separated by the distance L from the position a to the upstream side of the line is c. Then, as a means for preventing out-of-plane deformation of the metal band, a non-driving type holding roll for restraining the metal band by sandwiching the metal band is provided between the position c and the position b, and the metal band is provided. A winding facility has been proposed to prevent the meandering of the metal band caused by pinch roll by suppressing the out-of-plane deformation (lateral buckling) of the metal band.

Further, in Patent Document 3, the transport line is provided in a side guide facility which is arranged on the inlet side of a coiler for winding a strip transported along the transport line and guides the transported strip from the side. We are proposing side guide equipment that enables stabilization of the coil winding shape by arranging multiple independent side guides along the direction.

Further, in Patent Document 4, two pairs of side guides are provided between the take-up pinch roll installed on the entrance side of the take-up machine and the cooler for cooling, and the hot-rolled steel of the side guides is provided. Arrange the upstream side guides so that the distance between the parallel parts of the pair of upstream side guides arranged on the upstream side in the transport direction of the strip is wide enough so that the hot-rolled steel strip does not ride on the upstream side guides. After adjusting, when the tip of the hot-rolled steel strip reaches a position 0 to 3 m downstream from the protruding end of the parallel part, the distance between the parallel parts should be adjusted so that the hot-rolled steel strip is not pinched by the upstream side guide. By adjusting the arrangement of the upstream side guides so that they are as wide as the above, the hot-rolled steel strip is prevented from colliding with various related equipment installed on the entrance side of the winder, and the telescope of the coil is used. A technique for winding a hot-rolled steel strip is disclosed.

Japanese Unexamined Patent Publication No. 2001-04720 JP-A-2010-240704 Japanese Unexamined Patent Publication No. 2012-045609 Japanese Unexamined Patent Publication No. 2015-107499

As mentioned above, hot rolling equipment for producing hot-rolled steel strips typically has the center axis of the line, i.e. the center line of the hot run table carrying the strip, and the pinch roll and mandrel axes set equidistant. Therefore, it is desirable that the side guides installed as a pair on both sides of the hot run table in the width direction are arranged parallel to and equidistant from the center line of the hot run table. However, due to aging of the hot rolling equipment and the like, the axes of the pinch roll and the mandrel may not be orthogonal to the center line of the hot run table. In such a case, the coil shape of the strip wound by the mandrel has a telescope-like shape at the innermost peripheral portion (winding start portion) and the outermost peripheral portion (winding end portion) of the coil, and is stably formed into a coil. It becomes impossible to wind up.

Further, in the prior art of the above-mentioned patent document, no study has been made on how to deal with the case where the axes of the pinch roll and the mandrel are not orthogonal to the center line of the hot run table.

Therefore, the present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to heat even when the axes of the pinch roll and the mandrel are not orthogonal to the center line of the hot rolling table. The purpose of the present invention is to provide a side guide that enables the rolled steel strip (strip) to be wound around a mandrel without causing a telescope, and to propose a method for winding a hot rolled steel strip using the side guide. ..

In order to solve the above problems, the inventors have made extensive studies focusing on the function of the side guides arranged on the entrance side of the winding equipment. As a result, if the pinch roll axis and mandrel axis are not orthogonal to the center line of the hot run table and are tilted, upstream of the individual side guides arranged in pairs on both sides of the hot run table in the width direction. The telescope is raised by independently controlling the position of the side and the downstream side, and separately controlling the distance (displacement amount) of the side guide from the center line and the inclination angle of each side guide with respect to the center line. The coil can be wound normally without any problems, and the optimum distance from the center line of the side guides and the optimum tilt angle with respect to the center line of each side guide are determined at the start of winding the coil tip (the innermost circumference of the coil). ) And at the end of winding the coil tail end (the outermost periphery of the coil), it was found that the difference was found, and the present invention was developed.

Based on the above findings, the present invention is arranged as a pair on both sides in the width direction of the hot run table on the winding device entry side of the hot rolling equipment for manufacturing hot-rolled steel strips, and the side surfaces of the hot-rolled steel strips are restrained and wound. Provided is a side guide for guiding to a picking device, characterized in that the distances from the center lines on the upstream side and the downstream side of the side guides arranged on both sides in the width direction can be controlled independently. ..

The side guide of the present invention is characterized in that the distances from the center lines on the upstream side and the downstream side of the side guides arranged on both sides in the width direction can be changed during coil winding.

Further, the present invention is a method of winding a hot-rolled steel strip hot-rolled by a winding facility provided with the side guide described above on a coil, and is arranged as a pair on both sides of a hot run table in the width direction. The hot-rolled steel strip is wound by separately controlling the amount of displacement of the side guide from the center line and the inclination angle of each side guide on both sides in the width direction with respect to the center line. We propose a winding method for. Here, the displacement amount of the side guide from the center line means the distance from the center line of the hot run table at the position of the center of the side guide in the coil transport direction and the center in the coil width direction.

Further, in the method of winding the hot-rolled steel strip of the present invention, the displacement amount of the side guide from the center line and the inclination angle of the individual side guides on both sides in the width direction with respect to the center line of the hot-rolled steel strip are set. It is characterized by changing from the start of tip winding to the end of tail winding.

According to the present invention, the positions of the upstream side and the downstream side of the side guides arranged as a pair on both sides of the hot run table on the entrance side of the winding equipment can be independently controlled, and the coil winding is performed. Above all, since the above position can be controlled, even if the pinch roll axis and the mandrel axis are not orthogonal to the center line of the hot run table, heat is not caused in the innermost and outermost parts of the coil without causing a telescope. It becomes possible to wind the steel strip around the coil.

It is a figure explaining the latter part part of a hot rolling equipment. It is a figure which shows the state that the coil tip portion is introduced into a winding facility. It is a figure explaining the coil winding state when the pinch roll shaft P and the mandrel shaft M are not orthogonal to the center line L of a hot run table. It is a figure explaining the coil shape wound in FIG. It is a figure which showed the example of the side guide arrangement at the start of winding of the coil tip part when the pinch roll shaft P and the mandrel shaft M are not orthogonal to the center line L of a hot run table. It is a figure which showed the side guide arrangement example at the end of winding of the coil tail end part when the pinch roll shaft P and the mandrel shaft M are not orthogonal to the center line L of a hot run table. _{In the figure explaining the displacement amount W of the side guide from the center line L and the inclination angles θ A} and θ _B of the side guides 7A and 7B arranged on both sides in the width direction of the hot run table with respect to the center line L in the embodiment. be.

Hereinafter, embodiments of the present invention will be described in detail.
In the hot rolling equipment for carrying out the present invention, as shown in FIG. 1, the (hot-rolled steel strip) strip 1 coming out of the final stand 2 of the finishing rolling mill is conveyed on the hot run table 3 and the pinch roll 4 is carried. It is guided to the winding equipment and wound on the coil 6 by the mandrel 5. A pair or two or more pairs of side guides 7 are arranged on the upstream side of the pinch roll 4 at the most downstream portion of the hot run table 3, and serve as a guide when the strip 1 enters the pinch roll 4. I'm playing.

FIG. 2 shows a state when the cutting edge portion of the strip 1 is guided by the side guide 6 and enters the pinch roll 4. Normally, when the center axis of the line, that is, the center line L of the hot run table (hereinafter, also simply referred to as “center line”) and the axis P of the pinch roll are orthogonal to each other, the pair is paired on both sides in the width direction of the hot run table. The side guides 7A and 7B provided as above are arranged symmetrically and parallel to the center line L.

On the other hand, in FIG. 3, when the center line L of the hot run table and the axis P of the pinch roll and the axis M of the mandrel are not orthogonal to each other and are inclined, the strip is conveyed on the hot run table 3 without meandering. Even when it has been, from the point of view of the pinch roll and mandrel, it is equivalent to the state where the strip meanders and enters. As a result, as shown in FIG. 4, the tip of the strip wound around the mandrel is located at a position deviated from the center position C (usually, the center of the mandrel body length) in the body length direction of the mandrel to be wound. Since winding and subsequent winding proceed, a telescope having a size T is generated at the innermost peripheral portion of the coil.

Similarly, the tail end of the strip that has slipped through the final stand of the hot finish rolling mill is in a non-tensioned state and is transported on the hot run table without any constraint on the width direction position. Even if the strip is guided, a telescope is still generated at the outermost periphery of the wound coil.

Therefore, in the present invention, the distances from the center line L on the upstream side and the downstream side of the side guides installed as a pair on both sides of the hot run table in the width direction can be controlled independently, and the distance from the center line L can be controlled. By separately controlling and winding the displacement amount and the inclination angle of each side guide with respect to the center line, the coil is wound even when the center line L, the pinch roll axis P, and the mandrel axis M are not orthogonal to each other. Prevents the occurrence of telescopes in the innermost and outermost parts during winding. Hereinafter, a specific description will be given.

FIG. 5 shows an example of arrangement of side guides that is effective in preventing telescope at the innermost peripheral portion of the coil. At this time, the side guides 7A and 7B arranged as a pair on both sides in the width direction are arranged asymmetrically with respect to the center line L, and the inclination angles with respect to the center line are also different. Specifically, FIG. 7 shows _{the displacement amount W of the side guide from the center line L and the inclination angles θ A} and θ _B of the side guides 7A and 7B arranged on both sides of the hot run table in the width direction with respect to the center line L. When the deviation amount W from the center line L of the side guide is +10 mm, the inclination angle θ _A of the side guide 7A with respect to the center line of each side guide is 0 °, and the side guide 7B is defined as follows. The inclination angle θ _B of is preferably −0.057 °.

Further, FIG. 6 shows an example of arranging the side guides, which is effective for preventing the telescope of the outermost peripheral portion of the coil. The arrangement of the paired side guides 7A and 7B at this time is different from the optimum arrangement for preventing the telescope at the innermost peripheral portion. Specifically, the amount of displacement of the side guide from the center line L is -10 mm, the inclination angle θ _A of the side guide 7A with respect to the center line of each side guide is + 0.057 °, and the inclination angle θ _{B of the side guide 7B.} Is preferably +0.057 °.

Therefore, in order to prevent the telescope at the outermost periphery of the coil, the cylinders 8Aa, 8Ab, 8Ba and 8Bb on the upstream side and the downstream side of each side guide are independently controlled during the winding of the coil. Then, the positions of the side guides 7A and 7B while passing through the strip are changed from the state shown in FIG. 5 to the state shown in FIG. This makes it possible to prevent the occurrence of a telescope on the outermost periphery of the coil.

The side guides of the present invention shown in FIGS. 5 and 6 have cylinders 8Aa, 8Ab, 8Ba and 8Bb on the upstream side and the downstream side of the side guides arranged as a pair on both sides in the width direction of the hot run table. It can be installed to independently control the distance of each position from the center line L, thereby separately controlling the displacement of the side guides from the center line L and the tilt angle of each side guide with respect to the center line. It is possible.

In this way, by installing four cylinders 8Aa, 8Ab, 8Ba and 8Bb and controlling the distance from the center line L at each position independently, the side guide effective in preventing the occurrence of the telescope. It is possible to freely set the arrangement of. Further, since the optimum arrangement of the side guides differs between the time of winding the tip of the strip and the time of winding the tail end, the optimum arrangement of the side guides is different, so that the coil is being wound, that is, from the start of winding the tip of the strip to the end of winding the tail end. In the meantime, by changing the arrangement from the preferable arrangement of the innermost peripheral portion of the coil to the preferable arrangement of the outermost peripheral portion of the coil, it is possible to prevent the occurrence of telescopes on the innermost peripheral portion and the outermost peripheral portion of the coil. The coil winding shape can be stabilized.

The arrangement of the side guides at the time of coil winding between the time of cutting-edge winding and the time of winding the tail end of the strip may be arranged parallel and symmetrical with respect to the center line L of the hot run table as usual. , The side guides may be retracted to leave the strip unrestrained.

In the hot rolling equipment having the configuration shown in FIG. 1, a hot-rolled steel strip (strip) 1 having a plate thickness of 2.0 mm × a plate width of 1000 mm conveyed on a hot run table is mandreled via a pinch roll 4. A model is created to simulate the coil winding shape when winding around the coil 6 at 5, and the angle θ _P formed by the line orthogonal to the center line L of the hot run table and the pinch roll axis P is 1.15 °, the above center line. The coil winding shape at the time of winding the tip of the strip and the winding of the tail end of the strip when the _{angle θ M} formed by the line orthogonal to L and the mandrel axis M is 3.09 ° was simulated. At this time, the displacement amount W of the side guides shown in FIG. 7 from the center line L and the inclination angles θ _A and θ _B of the side guides 7A and 7B arranged on both sides in the width direction of the hot run table with respect to the center line L are set. The conditions were determined in various ways to minimize the amount of telescope generated during strip tip winding and strip tail winding. The displacement amount W is + on the left side and − on the right side with respect to the traveling direction of the strip, and the angle θ _P and the angle θ _M are + in the clockwise direction with respect to the line orthogonal to the center line L when viewed from above. , Counterclockwise is −, and the tilt angles θ _A and θ _B are + in the clockwise direction with respect to the center line L when viewed from above, and − in the counterclockwise direction. The length of the side guide was set to 5500 mm.

The results of the above simulation are shown in Table 1. As a result, when the tip of the strip was wound, W = + 10 mm, and the inclination angles θ _A = 0 ° and θ _B = −0.057 °, the amount of telescope was the smallest. On the other hand, at the time of winding the tail end of the strip, the telescope amount was the smallest when _{W = -10 mm, the inclination angle θ A} = + 0.057 °, and θ _{B = + 0.057 °.} The above simulation assumes a case where the pinch roll axis and the mandrel axis are tilted so much that it cannot normally occur from the direction orthogonal to the center line of the hot run table. The side guides arranged as a pair on both sides in the width direction can independently control the distance from the center line on the upstream side and the downstream side of each side guide, and it is effective to control each separately. confirmed.

1: Hot-rolled steel strip 2: Final stand of hot-finished rolling mill 3: Hot run table 4: Pinch roll 5: Mandrel 6: Coil 7: Side guide 8: Cylinder

Claims (4)

In the side guides that are arranged as a pair on both sides of the hot run table on the entry side of the hot-rolling equipment for hot-rolled steel strips in the width direction, and restrain the sides of the hot-rolled steel strips and guide them to the winding equipment.
A side guide characterized in that the distances from the center lines on the upstream side and the downstream side of the side guides arranged on both sides in the width direction can be controlled independently. The side guide according to claim 1, wherein the distances from the center lines on the upstream side and the downstream side of the side guides arranged on both sides in the width direction can be changed during coil winding. A method of winding a hot-rolled steel strip hot-rolled by a winding facility provided with a side guide according to claim 1 or 2 on a coil.
Hot-rolled steel strips by separately controlling the amount of displacement of the side guides arranged in pairs on both sides of the hot run table from the center line and the inclination angle of the individual side guides on both sides in the width direction with respect to the center line. A method of winding a hot-rolled steel strip, which is characterized by winding a steel strip. Here, the displacement amount of the side guide from the center line means the distance from the center line of the hot run table at the position of the center of the side guide in the coil transport direction and the center in the coil width direction. The amount of displacement of the side guide from the center line and the inclination angle of each side guide on both sides in the width direction with respect to the center line are changed from the start of winding the tip of the hot-rolled steel strip to the end of winding the tail end. The method for winding a hot-rolled steel strip according to claim 3, wherein the hot-rolled steel strip is wound.

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