JPH0557317A - Method and device for correcting point bend of rolled stock and hot strip rolling equipment - Google Patents

Abstract

PURPOSE:To correct the point bending of a rolled stock in a hot rolling time without time loss and influence to productivity by stop of a rolling mill, securely, without requiring a complicated device and a control means, in a simple constitution, economically and practically. CONSTITUTION:The upward camber of a bar material 30 rolled by the rolling mill 2D is corrected by vertically movable horizontal rollers 15 and the point of the bar material 30 having a point bend is brought into contact with one of a pair of vertical guide rollers 10 set to an opening a little larger than the width of the bar material 30 and the bend part of the point of the bar material 30 is bent by the reaction from a vertical roll of a thrust given by the rolling mill 2D to the bar material 30 to the direction opposite to the bend part to be corrected. Moreover, the vertical roller 11 is driven and rotated by a motor 11 to relieve a shock when the bar material 30 comes in contact with the vertical roller.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to hot strip rolling, and more particularly, to a method and apparatus for straightening the tip of a rolled material supplied from a rough rolling mill to a finish rolling mill.

[0002]

2. Description of the Related Art The production of a thin plate by hot rolling is 250 m
A slab material having a thickness of about m is subjected to reduction rolling by a rough rolling mill to a rolled material called a bar material having a plate thickness of 20 to 40 mm.
After that, by the finishing rolling group in which 6 to 7 units are closely arranged,
It is tandem rolled so as to have a predetermined product thickness and wound into a coil by a coiler.

Bending often occurs at the tip of the bar material rolled by the rough rolling mill. This rolled material with a bent tip is
The amount of bending increases as it is supplied to the subsequent finishing rolling mill group and the rolling progresses. This causes a problem that the productivity of the equipment and the yield of the rolled material decrease. In addition, if the tip of the bar material is greatly bent, it may cause a drawing accident in the finish rolling mill. The bending of the tip of the bar material is usually 20 to 25 mm in the width direction and 4 to 5 in the longitudinal direction.
It is about m. If there is more bending in the width direction, it will cause a drawing accident, and if it is more than 50 mm in the width direction, the possibility of a drawing accident will increase. In such a case, take measures to stop the finish rolling mill. Be done. In order to prevent such a situation, it is important to supply a bar material with a small tip bend to the finishing rolling mill group.For this reason, the tip bend of the bar material rolled by rough rolling is corrected and the amount of the bend is corrected. Needs to be small.

In general, a side guide and a width rolling mill are arranged in this order on the front surface of the rough rolling mill. The side guide guides the rolled material to the width rolling mill, and after the width rolling, the thickness is reduced by the rough rolling mill. Rolled. Since the width rolling mill and the rough rolling mill are arranged close to each other, there is no guide in the width direction between them, and the rolled material is width rolled by the width rolling mill while the thickness reduction rolling is performed by the rough rolling mill. The Rukoto. Therefore, it is said that the tip of the rolled material is easily bent when the rolled material is located at a position which is offset when biting into the width rolling mill, and the tip of the rolled material is bent when rough rolling is performed in this state. In order to avoid this, recently, some steelworks have adopted a method in which the leading end of the rolled material is centered by the side guide and then introduced into the width rolling mill.

In addition, as a similar technique, the actual development of Sho 61-1
As described in Japanese Patent No. 27809, there is a technique called a camber for correcting the bending of a rolled material. This is because the vertical rolls of a pair of width rolling mills are arranged on the rolling mill output side, and the bar material that has come out of the rolling mill is width-rolled at the time of rolling, and when a camber is detected, the width of the width rolling mill is correspondingly changed. A difference in rotation speed is given to two vertical rolls, and width rolling is performed in this state to correct the camber of the rolled material.

[0006]

Of the above-mentioned conventional techniques,
In the former method of centering the rolled material tip with the side guide and then entering the secondary rolling mill, it is necessary to stop the rolling mill for centering the rolled material, which causes a time loss. It will also occur and reduce productivity. Further, since the mechanism of occurrence of tip bending of the rolled material is complicated and various factors are caused to overlap each other, it is not possible to prevent the tip bending of the rolled material completely only by the above method. Have difficulty. At present, there is no effective method for correcting the tip bend when it occurs after rolling in the rough rolling mill.

[0007] The latter prior art disclosed in Japanese Utility Model Laid-Open No. 61-127809 is a control device for correcting the camber which is the overall bending of the rolled material as described above. There are the following problems when trying to apply to correction. The correction of the camber is performed while pressing the vertical roll of the width rolling mill against the rolled material. However, in the correction of the bending of the tip, it is necessary to control the opening and closing of the vertical roll in synchronization with the entry of the tip of the rolled material. That is, in the correction of the bending of the rolled material at the tip, the vertical roll of the width rolling mill has an opening larger than the width of the rolled material and waits before the tip of the rolled material enters, and the tip of the rolled material is rough. When the rolled material bites out, the bending direction and bending amount are detected, and when the tip of the rolled material reaches the position of the vertical roll, the vertical roll is closed according to the bending direction and bending amount of the tip, It is carried out by controlling the rotation speed of the roll. But in this case,
Since the distance between the rough rolling roll and the vertical roll is relatively short, it is difficult to perform a series of control and operations such as sensor detection and vertical roll rotation control in a short time, and the structure of the device is very complicated. It is not practical.

A first object of the present invention is to provide a method and apparatus for surely correcting the tip bending of a rolled material without causing a time loss due to stopping the rolling mill or reducing productivity. It is to be.

A second object of the present invention is to provide a method and a device for straightening the tip of a rolled material economically and practically with a simple structure without requiring a complicated device or control means. It is to be.

[0010]

In order to achieve the above-mentioned object, a method of straightening the tip of a rolled material according to the present invention is provided with a pair of adjustable openings on the exit side of a rolling mill according to the strip width of the rolled material. The guide vertical rollers are arranged so as to vertically face both sides in the width direction of the rolled material, and the opening of the vertical roller is set to be slightly larger than the width of the rolled material. When the tip of the rolled material is bent in the horizontal direction, the tip of the rolled material is applied to the vertical roller, and the bending portion of the rolled material tip is caused by the reaction of the thrust applied to the rolled material by the rolling mill from the vertical roller. It is characterized by straightening by bending back in the direction opposite to the bending.

A horizontal roller which can be raised and lowered is arranged on the exit side of the rolling mill, and after correcting the warp of the rolled material,
It is desirable to pass the rolled material between the vertical rollers.

Further, it is desirable that the pair of vertical rollers be driven and rotated by a motor.

Further, the apparatus for straightening the tip of a rolled material according to the present invention is arranged at the exit side of the rolling machine at a position which vertically faces both sides in the width direction of the rolled material, and opens depending on the plate width of the rolled material. It is characterized by comprising a pair of vertical guide rollers whose degree can be adjusted, and means for setting the opening of the vertical rollers to be slightly larger than the width of the rolled material.

It is desirable that a horizontal roller that is vertically movable is provided between the exit side of the rolling mill and the vertical roller.

Further, it is desirable to include motor means for driving and rotating the pair of vertical rollers.

Further, the hot strip rolling equipment according to the present invention includes a rough rolling mill group, a finishing rolling mill group, and an exit side of the final rough rolling mill between the rough rolling mill group and the finishing rolling mill group. And a device for straightening the front end of the rolled material, which is arranged at.

[0017]

In the present invention, since a pair of vertical guide rollers is arranged on the delivery side of the rolling mill and the opening of the vertical rollers is set to be slightly larger than the width of the rolled material, it is possible to Even if the tip bends in either direction, the tip hits one of the vertical rollers and the reaction force of the thrust given to the rolled material by rolling from the vertical rolls causes a force to bend back the bent portion in the opposite direction to the bending. It works and the tip bending is corrected without buckling. Incidentally, it is possible to cope with a change in plate width by making it possible to adjust the opening degree of the pair of vertical rollers.

In the case where a horizontal roller which can be raised and lowered is arranged between the exit side of the rolling mill and the vertical roller, the warp of the tip of the rolled material is corrected by this, so that the rolled material is separated between the vertical rollers. It can guide you to the right position.

Further, by driving and rotating the pair of vertical rollers with a motor, the impact when the rolled material hits the vertical rollers is mitigated, so that the bending is smoothly corrected and the vertical rollers are damaged by the impact. There is no.

Further, in the hot strip rolling equipment according to the present invention, since a rolling material tip straightening device is provided between the rough rolling mill group and the finishing rolling mill group on the outlet side of the final rough rolling mill, It can be conveyed to the finishing rolling mill group after the tip bending of the is surely corrected.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A method and apparatus for forcing the bending of rolled material and hot strip rolling equipment according to an embodiment of the present invention will be described below with reference to FIG.
From now on, description will be made with reference to FIG. First, an outline of a system of hot strip rolling equipment according to the present embodiment will be described with reference to FIG. FIG. 2 is a schematic view showing the arrangement of main devices of the hot strip rolling equipment according to this embodiment. The slabs (steel pieces) extracted from the heating furnace 1 are side guides 4A, 4 respectively.
Rough rolling mills 2A, 2 equipped with B, 4C, 4D on the entrance side
B, 2C, 2D, and a rough rolling mill group consisting of width rolling mills 3A, 3B close to the rough rolling mills 2C, 2D, respectively, rough-rolls to a predetermined thickness to form a bar material. The tail end crops are cut off, further tandem-rolled by a finishing mill group 7 composed of several finishing mills, and then wound by a down coiler 8A or 8B to form a product coil.

The tip straightening device 5 according to this embodiment is provided with a pair of vertical guide rollers 10 and is arranged on the exit side of the final rough rolling mill 2D of the rough rolling mill group, and the side guide 4 is provided.
The bar material guided by D and roughly rolled by the width rolling mill 3B and the rough rolling mill 2D is straightened by the tip bending straightening device 5 and conveyed to the finishing rolling mill group 7 which is the next step.

Next, the principle of straightening the tip of the rolled material according to the present invention will be described with reference to FIG. FIG. 3 is a plan view showing the principle of correcting the tip bending of the rolled material rolled by the final rough rolling roll by a pair of vertical guide rollers. A bending δ as shown by the solid line in the figure occurs at the tip of the bar material 30 rolled by the final rolling roll 9, and hits one of the vertical rollers 10. The length d of the bent portion of this tip is usually 4
It is about 5 m. At this time, the bar material 30 is the rolling mill 2D.
Since the thrust given by (see FIG. 2) tries to move forward (in the direction of the arrow in the figure), the curved portion at the tip end is broken by the reaction from the vertical roller with the biting portion of the rolling roll 9 as the supporting portion. As shown by, the reverse bending is forcibly corrected in the same plane as the plate surface.

Here, the vertical roller 10 is made wider than the width of the bar member 30.
When the opening degree is small, the vertical roller 10 is width-rolled, so that it is necessary to increase the driving force of the vertical roller 10. If this driving force is small, the bar material 30 stops when the tip of the bar material 30 hits the vertical roller 10, and the bar material 30 bends in an accordion shape between the rolling roll 9 and the vertical roller 10, causing a rolling trouble. Further, if the driving force is increased and the width is rolled, the tip may be bent again. In order to prevent this and properly correct the bending of the tip of the bar member 30, the opening S of the vertical roller 10 is set so that there is a gap g on both sides of the plate width W of the bar member 30. (That is, S = W + 2 g). As a result, the bar material 30
The width rolling is avoided, and the δ-g correction is performed. The distance L between the rolling roll 9 and the vertical roller 10 may be the same as the distance d (usually about 4 to 5 m).
Further, if the opening degree S of the vertical roller can be adjusted and set in advance before the rolling operation, it can be coped with even if the strip width W changes.

The pair of vertical rollers 10 may be freely rotated, but it is preferable that the pair of vertical rollers 10 be driven and rotated by the motor 11 (see FIG. 4), whereby the bar member 30 is rotated.
Since the impact at the time of hitting 0 is relieved, the bend is smoothly corrected and the vertical roller 10 is not damaged by the impact. The driving force at this time may be a small driving force for rotating only the vertical roller.

Next, the structure of the apparatus for straightening the tip of a rolled material according to this embodiment will be described with reference to FIGS. 1, 4 and 5. FIG. 1 is a plan view of an apparatus for straightening a tip of a rolled material and a final rough rolling machine according to this embodiment, and FIG.
FIG. 5 is a sectional view in the IV direction, and FIG. 5 is a partial sectional view in the VV direction in FIG. As shown in FIG. 1, a vertical roller unit 5A is installed at a position at a distance L (usually about 4 to 5 m) close to the rough rolling mill 2, and the vertical roller unit 5A is installed.
Two vertical rollers 10 for guiding are provided at a position facing the center of the path. As will be described later, the vertical roller 10 can change the opening S by the cylinder 13 from the maximum S ₁ shown in the drawing to the minimum S ₂ . Bar material 3
0 is sent from the left side to the right in the figure, and the final rolling roll 2D
After the rough rolling is completed by, the warp is corrected by a horizontal roller 15 which will be described later, immediately guided by the vertical roller unit 5 by the guide 18, the tip bending is corrected by the vertical roller 10, and further the horizontal roller 20 finishes the finish rolling machine. Transported to group 7 (see FIG. 2).

Further, as shown in FIG. 4, the vertical rollers 10 are each driven and rotated by a motor 11 to form a roller assembly together with the bearing box 17 and are incorporated in the roller support 12. The roller support 12 moves horizontally on the frame 14 (left and right in the plane of the drawing) by the cylinder 13, whereby the opening S of the vertical roller corresponding to the width W of the bar member 30.
(= W + 2g) can be adjusted.

Further, as shown in FIG. 5, a horizontal roller 15 and a cylinder 16 are provided between the final rough rolling mill 2D and the vertical roller unit 5. This horizontal roller 15
Is a cylinder 1 attached to the frame 2d of the rough rolling mill 2D.
It can be moved up and down by 6.

Next, the operation of this device will be described.
The vertical roller 10 receives the width command of the bar material 30 in advance.
Is set to the above-described opening degree S and driven and rotated at that position to stand by, and the horizontal roller 15 is lowered to a position h above the pass line 19 as shown in FIG. It is desirable that this h be a dimension corresponding to the thickness of the bar material 30 or a dimension slightly larger than that. In this state, the bar material 30 advances in the direction of the arrow as shown in FIG. 1, is rolled by the rolling roll 9 of the final rough rolling mill 2D, and when the tip of the bar material 30 warps, the horizontal roller 15 is used. This is corrected and guided to the vertical roller 10. At this time, if the bar member 30 is bent at its tip, the bar member 30 contacts the vertical roller 10 on the side in the bending direction. However, the bar material 30 is still a rolling roll 9
The bar material 3 is rolled by
0 is pushed further forward, and the tip of the bar material 30 is corrected to the opposite side by the reaction from the vertical roller 10. It is important that the bar member 30 does not hit the vertical roller 10 and cause buckling or oblique biting. For this reason, the diameter of the vertical roller 10 is large.

According to this embodiment, the tip end of the bar material 30 bent in the horizontal direction is applied to the vertical guide roller 10 and is corrected by the reaction of the thrust provided by the rolling roll 9, so that the rolling mill is stopped. It is possible to correct the bending of the tip of the bar material with a simple structure without any need for a reliable and complicated device or control means.

Further, since the horizontal warp 15 arranged between the exit side of the final rough rolling mill 2D and the vertical roller unit 5 corrects the warp of the tip of the bar material 30, the bar material 30 is vertically rolled. It can guide to a suitable position between 10.

Further, by driving and rotating the vertical roller 10 by the motor 11, the impact when the bar material 30 hits the vertical roller 10 is mitigated, so that the bending is smoothly corrected and the vertical roller 10 is impacted. It will not be damaged.

Further, by providing a tip bending straightening device 5 for the rolled material between the rough rolling mill group 2 and the finishing rolling mill group 7 at a position close to the exit side of the rough rolling mill group 2, the tip bending of the bar material is provided. Can be conveyed to the finishing rolling mill group 7 after being reliably corrected.

[0034]

According to the present invention, there is no time loss due to the stop of the rolling mill and no influence on the productivity, and reliably and without a complicated device or control means, with a simple structure, It is possible to straighten the tip of the rolled material economically and practically.

Therefore, troubles due to the finishing rolling mill are eliminated, the coil winding shape is improved, and a hot-rolled sheet product with high efficiency and high yield can be manufactured.

[Brief description of drawings]

FIG. 1 is a plan view showing an apparatus for straightening a tip of a rolled material and a final rough rolling machine according to an embodiment of the present invention.

FIG. 2 is a schematic diagram showing an arrangement of main devices of a hot strip rolling facility according to an embodiment of the present invention.

FIG. 3 is a plan view showing the principle of correcting bending of a rolled material according to the present invention.

FIG. 4 is an IV-of the apparatus for straightening the tip of rolled material shown in FIG.
It is a cross-sectional arrow view of the IV direction.

5 is a cross-sectional view taken along line VV of the apparatus for straightening the tip of a rolled material and the final rough rolling machine shown in FIG.

[Explanation of symbols]

 2 Rough rolling mill group 2A, 2B, 2C, 2D Rough rolling mill 5 Tip bending correction device 7 Finishing rolling mill group 9 Rolling roll 10 Vertical roller 11 Motor 13 Cylinder 15 Horizontal roller 16 Cylinder 30 Bar material (rolling material)

Claims (7)

[Claims] 1. A pair of vertical guide rollers, on the delivery side of the rolling mill, whose opening can be adjusted according to the plate width of the rolled material, are positioned vertically facing the widthwise sides of the rolled material. And the opening of the vertical roller is set slightly larger than the width of the rolled material, and the tip of the rolled material is applied to the vertical roller when the tip of the rolled material is bent in the horizontal direction. The tip of the rolled material is corrected by bending back the bent portion of the tip of the rolled material in the direction opposite to the bending by the reaction of the thrust given to the rolled material by the rolling mill from the vertical roller. Correction method. 2. A horizontal roller that can be raised and lowered is arranged on the exit side of the rolling mill, and after correcting the warp of the tip of the rolled material, the rolled material is passed between the vertical rollers. The method for straightening the tip of a rolled material according to claim 1. 3. The motor according to claim 1, wherein the pair of vertical rollers are driven and rotated by a motor.
A method for straightening the tip of a rolled material as described. 4. A pair of vertical guide rollers, which are arranged at positions on the exit side of the rolling mill and vertically face both sides in the width direction of the rolled material and whose opening can be adjusted according to the plate width of the rolled material. And a means for setting the opening of the vertical roller to be slightly larger than the width of the rolled material. 5. The apparatus for straightening the tip of a rolled material according to claim 4, further comprising a horizontal roller which is arranged between the exit side of the rolling mill and the vertical roller and which can be raised and lowered. 6. An apparatus for straightening a tip of a rolled material according to claim 4, further comprising a motor means for driving and rotating the pair of vertical rollers. 7. The rough rolling mill group, the finishing rolling mill group, and any one of claims 4 to 6 arranged on the exit side of the final rough rolling mill between the rough rolling mill group and the finishing rolling mill group. Or a device for straightening the tip of a rolled material according to item 1.