JPH1080713A - Device for stabilizing runout running of hot rolled strip - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device for stabilizing the runout running of a hot rolled strip, which can cope with both of the jumping up of the tip of the hot rolled strip and the occurrence of a loop in the middle of processing without requiring any complex control mechanism. SOLUTION: In this device for transferring the hot-rolled strip 5 toward a coiler while it is being cooled on a runout table 3 to form a hot rolled oil 18 by coiling it with a coiler 8, one or plural guide extension member 10 extended in parallel in the proceeding direction of the hot rolled strip in the upside of the runout table 3, is (are) arranged. The shape of the extension member 10 is not limited to a complete roundness, a square or other proper sectional shapes is (are) acceptable, and a metal plate is acceptable as well.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an apparatus for stabilizing the running of a hot-rolled steel strip on a run-out table of a hot-rolling plant for producing a hot-rolled steel strip.

[0002]

2. Description of the Related Art Generally, a hot-rolled steel strip, which has been finish-rolled to a predetermined thickness by a finish-rolling mill, is injected with cooling water while being transported through a run-out table installed over a length of about 100 m. Forced cooling to the temperature of
Then, via a pinch roll that switches the transport direction,
It is sent to a coiler and wound up to become a hot rolled coil.

However, when a thin hot-rolled steel strip having a final sheet pressure of 2.0 mm or less is run out and conveyed, the hot-rolled steel strip is bent (see FIG. 4) or undulated (see FIG. 5). It is a problem.

[0004] These phenomena are mainly caused by the following two causes.

First, the leading end of the hot-rolled steel strip in the traveling direction jumps up on the exit side of the finishing mill or on the table roll of the run-out table (see FIG. 6). Evolve into a phenomenon.

Next, due to slippage between the table roll and the hot-rolled steel strip, the conveying speed of the hot-rolled steel strip by the table roll becomes lower than the speed of the hot-rolled steel strip sent from the finishing mill. As a result, a loop is formed in the middle of the hot-rolled steel strip (see FIG. 7), and the hot-rolled steel strip develops a waving phenomenon.

[0007] These phenomena occur more remarkably as the thickness of the hot-rolled steel strip is smaller and as the conveying speed is higher. Once generated, it deteriorated the running performance on the run-out table, induced poor winding with a coiler, and was one of the causes of line stoppage.

[0008] Further, when the waving phenomenon occurs, uneven cooling of the hot-rolled steel strip occurs, and the quality of the product varies, and the yield decreases.

Conventionally, in order to cope with such a phenomenon, the hot-rolled steel strip is moved as slowly as possible until the end of the hot-rolled steel strip reaches the coiler and the hot-rolled steel strip is wound around the mandrel of the coiler. The conveyor is run-out and the conveying speed is increased after the end of the hot-rolled steel strip is wound. However, even in the case of low-speed conveyance in this way, the instability of run-out traveling has not been sufficiently improved. In addition, since the paper is conveyed at a low speed, the productivity is reduced.

Therefore, recently, a technique for stabilizing the run-out running of the hot-rolled steel strip until completion of the winding around the coiler has been proposed. As an example, see JP-A-7-20
Japanese Patent No. 4723 discloses that a tip of a hot-rolled steel strip is prevented from being lifted by a guide plate attached to a bogie traveling on a run-out table at the same speed as the tip of the hot-rolled steel strip.

[0011]

However, the technique described in Japanese Patent Application Laid-Open No. Hei 7-204723 uses a guide plate attached to a traveling bogie to press only the tip of the hot-rolled steel strip. It is possible to cope with unstable run-out running of the hot-rolled steel strip caused by the jumping of the hot-rolled steel strip, but cannot cope with a phenomenon that a loop is generated in the middle of the hot-rolled steel strip at all. In addition, there is a problem in that complicated control of running the bogie at the same speed as the hot-rolled steel strip is required.

The present invention has been made in view of such problems of the conventional technology. That is, an object of the present invention is to provide a device for stabilizing the run-out running of a hot-rolled steel strip, which does not require a complicated control mechanism and can cope with both the jump of the tip of the hot-rolled steel strip and the occurrence of a loop in the middle. To provide.

[0013]

In order to achieve this object, the present invention provides a hot rolled steel strip cooled on a run-out table in order to form a hot rolled coil by winding by a coiler. In the apparatus for transporting the steel sheet toward the coiler, one or a plurality of guide extension members extending parallel to the traveling direction of the hot-rolled steel strip are arranged above the run-out table.

Therefore, even if the end of the hot-rolled steel strip after finish rolling is jumped up or a loop is formed in the middle of the hot-rolled steel strip, the hot-rolled steel strip is pressed down by the guide extension body. The disturbance does not evolve into a fold or waving phenomenon at the end of the hot-rolled steel strip.

[0015]

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

FIGS. 1 to 3 show a continuous hot rolling facility equipped with an embodiment of a hot-rolled steel strip run-out running stabilizing apparatus according to the present invention.

The equipment includes a finishing mill 1, a run-out table 3 disposed downstream of the finishing mill 1 and having table rolls 2 arranged side by side, and a hot-rolled steel strip provided on the run-out table 3. And a cooling stand 6 provided on the run-out table 3 for injecting cooling water toward the hot-rolled steel strip 5, a pinch roll 7 disposed downstream of the run-out table 3, and a pinch roll 7. And a coiler 8 disposed downstream of the roll 7.

Here, the run-out running stabilizer 4 is
It comprises a support portion 9 and a guide rod 10 which is an example of a guide extension member supported by the support portion 9. Although two guide rods 10 are used in the present embodiment, the present invention is not limited to this, and one or more guide rods 10 may be provided. In the guide rod 10 of the present embodiment, the cross section of the guide extension member is formed in a perfect circular shape. However, the shape is not limited to this, and may be a quadrangle or any other appropriate cross sectional shape. Further, it is not limited to the bar material, and may be, for example, a plate material.

In this example, the support portions 9 are paired on the left and right outer sides of the run-out table 3 (see FIG. 2), and a plurality of columns 1 are provided along the run-out table 3.
1, a round rail-shaped rail shaft 12 erected and fixed horizontally between a pair of right and left columns 11, and a cylinder that can move horizontally along the rail shaft 12 and is hydraulic or pneumatic. A pair of left and right horizontal movers 13 is provided, and a piston 14 is provided on the lower surface of the horizontal mover 13 so as to be vertically expandable and contractible and has a guide rod 10 fixed at the lower end.

The support portion 9 is provided with a guide rod 10 as follows.
Also serves as a position adjustment mechanism. The horizontal mover 13 is moved in the table width direction along the rail shaft 12 by an appropriate driving means (not shown) to adjust the position of the guide rod 10 in the width direction (the interval between the two guide rods 10). It has become. On the other hand, the piston 14 expands and contracts to adjust the position of the guide rod 10 in the vertical direction.

That is, in this example, the position adjusting mechanism of the guide rod 10 is configured to adjust the position of the hot-rolled steel strip 5 in the width direction and the position of the vertical distance from the hot-rolled steel strip 5. I have. The position is adjusted by changing the position of the guide bar 10 to an optimum position according to the width and the thickness of the hot-rolled steel strip 5 (the optimum position will be described later).

The guide bar 10 is installed at an appropriate distance in the vertical direction of the table roll 2 so as to extend in parallel with the traveling direction of the hot-rolled steel strip 5. In this example, two run-out tables 3 are provided in the width direction. The reason why the two guide rods are provided is to set the position of the guide rod 10 above the vicinity of the left and right edges 5A of the hot-rolled steel strip 5, which is the optimum position.

The position of the guide rod 10 is desirably set as follows in the width direction and the vertical direction in relation to the hot-rolled steel strip 5.

When setting the position in the width direction Regarding the position of the guide rod 10 in the width direction of the hot-rolled steel strip 5, the following two points are important.

One point is that all of the guide rods 10 are directly above the hot-rolled steel strip 5. This is, of course, required for the function of suppressing the jump and loop of the hot-rolled steel strip 5.

Another point is that the guide rod 10 does not block the cooling water required for good cooling of the hot-rolled steel strip 5.

The temperature near the left and right edges 5A of the hot-rolled steel strip 5 tends to be lower than that at the center 5B. Therefore, it is not good for the central portion 5B to block the cooling water, but if the quality in the width direction of the hot-rolled steel strip 5 is to be made uniform, the edge 5A
It is better to block off the cooling water in the vicinity.

The position that can satisfy both of the above two points is right above the vicinity of the left and right edges 5A of the hot-rolled steel strip 5. Most preferably, the guide rod 10 is set at a position within about 10 cm from the left and right edges 5A of the hot-rolled steel strip 5.

When setting the position in the vertical direction The distance between the guide rod 10 and the hot-rolled steel strip 5 at which the position should be set is as follows.

If the distance between the guide rod 10 and the hot-rolled steel strip 5 is too short, the hot-rolled steel strip 5 may receive a frictional force from the guide rod 10 when a jumping portion or a loop portion hits the guide rod 10. Becomes too large and the running of the hot-rolled steel strip 5 is hindered. Conversely, if it is too far, the hot-rolled steel strip 5
The effect of holding down the steel strip is lost, and the hot-rolled steel strip 5
There is a possibility that the end portion may be bent or wavy between 0 and the run-out table 3.

From this, the guide rod 10 and the hot-rolled steel strip 5
The optimal value of the distance between is preferably about 5 to 10 cm.

After all, the position of the guide rod 10 is
At a position within about 10 cm from the left and right edges of the steel sheet and the vertical distance between the guide rod 10 and the hot-rolled steel strip 5 is about 5 cm.
It is most desirable to set at a position of 10 cm to 10 cm.

The position of the guide rod 10 may be determined in consideration of the conveying speed in addition to the width and thickness of the hot-rolled steel strip 5. Further, it is desirable to automatically control the position setting of the guide bar 10 based on rolling conditions such as the width and the thickness of the hot-rolled steel strip 5.

The guide rod 10 has both ends, that is, the end on the side where the hot-rolled steel strip 5 is loaded into the run-out table 3 (the loading end) and the hot-rolled steel strip 5 is unloaded from the run-out table 3. An inclined carry-in portion 15 and an inclined carry-out portion 16 that are inclined upward are formed at the side end (the carry-out side end), respectively. The inclined carry-in portion 15 is formed to smoothly feed the tip of the hot-rolled steel strip 5 coming out of the finishing mill 1 between the guide bar 10 and the run-out table 3.
It is desirable to set the angle to 10 ° to 20 ° because the function of smoothly feeding can be sufficiently exhibited. Inclined unloading section 16
Is similarly formed in order to smoothly feed out the tip of the hot-rolled steel strip 5.

As shown in FIG. 2, the guide rod 10 is provided with a cushioning member 17. In this example, the guide rod 10 is wound so as to surround the entirety.

The cushioning member 17 is formed by the hot-rolled steel strip 5 and the guide rod 10.
This is provided in order to prevent the hot-rolled steel strip 5 from being scratched even when it comes into contact with the steel sheet. As a material of the cushioning material 17, a heat-resistant resin such as polyimide is preferable. The reason is that the cushioning material 17 needs to be soft enough not to cause flaws in the rolled steel strip 5 and to receive heat radiation from the hot-rolled steel strip 5 so that heat resistance is required. .

The stabilizing device 4 for run-out of the hot-rolled steel strip 5 configured as described above prevents the tip of the hot-rolled steel strip 5 from breaking or waving as follows.

The guide rod 10 is previously set to an optimum position by a position adjusting mechanism according to the width and the thickness of the hot-rolled steel strip 5. The horizontal mover 13 moves in the table width direction along the rail axis 12, and sets the position in the width direction of the guide rod 10, that is, the installation interval between the two guide rods 10. The vertical position of the guide rod 10 is set by the expansion and contraction of the piston 14.

The position of the guide rod 10 is within about 10 cm from the left and right edges of the hot-rolled steel strip 5, and the vertical distance between the guide rod 10 and the hot-rolled steel strip 5 is about 5 to 10c.
Set to be at the position of m.

The tip of the hot-rolled steel strip 5 coming out of the finishing mill 1 is smoothly fed between the guide rod 10 and the run-out table 3 by the inclined carry-in section 15.

Thereafter, the hot-rolled steel strip 5 is
It travels on and is transported. Even if the tip of the hot-rolled steel strip 5 jumps up (see FIG. 6) or a loop is formed in the middle (see FIG. 7), the hot-rolled steel strip 5 is pressed by the guide rod 10 (see FIGS. 8 and 9). Therefore, the run-out traveling of the hot-rolled steel strip 5 is stabilized without causing the tip portion to be bent (see FIG. 4) and the waving phenomenon (see FIG. 5). Similarly, the running of the rear end of the hot-rolled steel strip 5 is also stabilized. Since the waving phenomenon of the hot-rolled steel strip 5 is prevented, the cooling water hits without unevenness, and no uneven cooling occurs.

Even if the hot-rolled steel strip 5 comes into contact with the guide rod 10 (see FIGS. 8 and 9), the hot-rolled steel strip 5 may be flawed because the guide rod 10 is wrapped by the cushioning material 17. There is no.

Cooling water is injected into the traveling hot-rolled steel strip 5 from above. Since the two guide rods 10 are set near the left and right edges 5A of the hot-rolled steel strip 5, the hot-rolled steel strip 5
The required cooling water is not obstructed. The cooling water is somewhat interrupted by the guide rods 10 around the left and right edges 5A of the hot-rolled steel strip 5, but the temperature near the left and right edges 5A of the hot-rolled steel strip 5 tends to be lower than that at the center.
Rather, the quality in the width direction of the hot-rolled steel strip 5 becomes uniform.

The hot-rolled steel strip 5 has its leading end protruding from the run-out table 3 and is switched in the conveying direction by the pinch roll 7. Then, the hot-rolled steel strip 5 is wound around the coiler 8 to form the hot-rolled coil 18. Since the frequency of occurrence of the bending of the tip of the hot-rolled steel strip 5 and the waving phenomenon is significantly reduced, defective winding is greatly reduced.

[0045]

Next, an embodiment of the present invention will be described.

The inventor of the present invention determined the rate of occurrence of breakage at the end of a hot-rolled steel strip 5 having a final plate thickness of 2.0 mm or less, in which run-out running performance is a problem, by using a conventional steel strip without running stabilizing device 4 (comparative example). ) Was compared with an example of the present invention. Hot rolled steel strip 5
Was 650 mpm in the comparative example and 750 mpm in the example. The calculation of the folding rate was derived from 25,321 examples for the comparative example and 2,754 examples for the example.

The results are as shown in Table 1 below.

[0048]

Table 1 Finished plate thickness (mm) Folding occurrence rate of comparative example (%) Folding occurrence rate of example (%) １．２1.29 435 1.30 to 1.49 21 1 1.50 to 1.69 70 1.70 to 1.99 30 From the results shown in Table 1, it was confirmed that according to the present invention, the number of breaks in the tip of the hot-rolled steel strip 5 was significantly reduced as compared with the conventional steel strip. In addition, the run-out transfer speed of the hot-rolled steel strip 5 also had a difference of about 100 mpm compared to the conventional one, and it was confirmed that the productivity was improved.

[0049]

The hot-rolled steel strip run-out traveling device of the present invention described above comprises a guide extension member provided above the run-out table, and the tip of the hot-rolled steel strip jumps up or a loop is formed on the way. Even if it is held down by the guide extension member, the bending and waving of the end can be significantly reduced, so that the run-out traveling of the hot-rolled steel strip can be stabilized without complicated control.

Further, not only disturbance at the front end of the hot-rolled steel strip but also disturbance at the middle and rear ends of the hot-rolled steel strip can be dealt with.

Furthermore, since the bending and waving phenomenon at the end of the hot rolled steel strip can be significantly reduced, the number of coils to be scrapped due to poor winding can be reduced, and uneven cooling of the hot rolled steel strip due to the waving phenomenon can be achieved. And the product yield of the hot-rolled steel strip can be improved.

Furthermore, line stoppage due to poor winding is reduced, and the run-out conveyance speed can be increased, so that productivity can be improved.

[Brief description of the drawings]

FIG. 1 is a schematic side view of a continuous hot rolling equipment provided with an embodiment of a hot-rolled steel strip run-out traveling device of the present invention.

FIG. 2 is a schematic cross-sectional view of the continuous hot rolling equipment of FIG. 1 as viewed in the direction of arrows AA.

FIG. 3 is a side view of the continuous hot rolling equipment of FIG. 2 as viewed in the direction of arrows BB.

FIG. 4 is a state diagram showing a run-out running defect (bent) of a hot-rolled steel strip.

FIG. 5: Run-out running failure of hot-rolled steel strip (undulation phenomenon)
FIG.

FIG. 6 is a state diagram showing a cause of run-out running failure of a hot-rolled steel strip (tip portion jumping up).

FIG. 7 is a state diagram showing a cause of run-out running failure of a hot-rolled steel strip (the occurrence of a loop).

8 is an operation state diagram showing an example of an operation of the hot-rolled steel strip run-out traveling device of FIG. 1;

FIG. 9 is an operation state diagram showing another example of the operation of the hot-rolled steel strip run-out traveling device of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Finish rolling mill 2 Table roll 3 Run-out table 4 Run-out running stabilizer 5 Hot-rolled steel strip 7 Pinch roll 8 Coiler 9 Support part (Position adjusting mechanism) 10 Guide rod (Guide extension member) 11 Post 12 Rail axis 13 Horizontal movement Child 14 Piston 15 Inclined carry-in section 16 Inclined carry-out section 17 Buffer material 18 Hot rolled coil

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Yoshimichi Hino, Inventor 1-1-2 Marunouchi, Chiyoda-ku, Tokyo Nihon Kokan Co., Ltd. (72) Inventor Sadaka Masuda 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Sun Honko Co., Ltd.

Claims (5)

[Claims] An apparatus for conveying a hot-rolled hot-rolled steel strip toward a coiler while cooling the hot-rolled steel strip on the runout table in order to form a hot-rolled coil by winding the coil with a coiler. A run-out running stabilizing device for a hot-rolled steel strip, wherein one or a plurality of guide extension members extending in parallel to the traveling direction of the hot-rolled steel strip are arranged. 2. The run-out running stabilizing device for a hot-rolled steel strip according to claim 1, further comprising a position adjusting mechanism for adjusting a position of the guide extension member. 3. The runout running stabilizing device for a hot-rolled steel strip according to claim 1, wherein the guide extension member is provided with a cushioning material. 4. The apparatus for stabilizing a run-out run of a hot-rolled steel strip according to claim 3, wherein the buffer material is made of a heat-resistant resin. 5. The guide extension member according to claim 1, wherein at least an end portion on a side where the hot-rolled steel strip is carried into the run-out table is inclined upward. The device for stabilizing a run-out of a hot-rolled steel strip according to one of the above.