JP3416393B2 - Hot rolling equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to hot rolling equipment for iron making machines equipped with a scale removing device.

[0002]

2. Description of the Related Art FIG. 4 shows an example of a conventional scale stripping apparatus (scale stripping apparatus for the surface of a metal plate) in a hot rolling facility, in which (a) is a perspective view of essential parts and (b) is a side view thereof. is there.

In the figure, 1'denotes a rolled metal sheet material (strip), 2'denotes a slit jet nozzle, 3'denotes a liquid jet, and the surface of the strip 1'is flat during scale separation in a conventional hot rolling line. The liquid jet 3'is jetted from one direction from a slit jet nozzle 2'composed of a plurality of slits arranged obliquely with respect to the part to collide with the strip to remove the scale generated on the strip surface during the hot rolling operation. is doing.

[0004]

By the way, in the conventional scale peeling apparatus for jet-colliding the jet stream onto the strip surface from one direction as described above, after the collision, the jet fluid flows in the line direction along the surface of the material to be rolled. Therefore, there is a problem in that the accumulated time of the jet fluid is long and the material to be rolled is cooled more than necessary.

When the temperature of the material to be rolled decreases in this way,
The deformation resistance of the material to be rolled becomes large, which causes a problem in hot rolling in the subsequent process. In addition, the temperature of the material to be rolled may be lowered to a temperature not higher than the temperature desired for rolling, resulting in a reduction in the quality of the material to be rolled or the necessity of newly providing a heating device.

The present invention solves the above-mentioned problems of the prior art, shortens the jet retention time on the strip surface, and provides a hot rolling facility equipped with a new scale stripping device for reducing the temperature drop of the strip. The challenge is to provide.

[0007]

[Means for Solving the Problems] As a structure for solving the above problems, in a hot rolling facility of the present invention, a surface of a rolled metal material is collided immediately before a row of hot rolling mills for rolling the rolled metal material. High pressure is applied to the surface of the metal material to be rolled, which is inclined toward the downstream and upstream directions so that the latter two jets collide with each other.
To remove the scale on the surface of the metal material to be rolled.
A scale stripping device is provided which has first and second jet nozzles to be removed , and the jet nozzles are composed of a large number of cylindrical nozzle groups arranged in parallel in the width direction of the metal material to be rolled.

In the hot rolling equipment according to the present invention, the scale peeling device having the above-described structure is used between rolling mills in a row of hot rolling mills for rolling the metal material to be rolled, or hot rolling for rolling the metal material to be rolled. It may be configured to be provided between the first and second rolling mills in the train.

Further, in the scale peeling apparatus used in the hot rolling equipment according to the present invention, the jet flow may be water.

As described above, since the hot rolling equipment according to the present invention has the scale peeling device composed of a large number of cylindrical nozzles arranged in parallel in the width direction of the metal material to be rolled, the collision range of the jet flow is widened. Wider scale peeling range. Also,
In this way, the jet formed by a large number of cylindrical nozzle groups separates from the strip due to collision, so that the temperature drop of the strip due to the jet is reduced.

In the scale stripping apparatus used in the hot rolling equipment according to the present invention, the inclination angle of each of the first and second jet nozzles or any one of them can be variably adjusted.
Therefore, the surface temperature of the rolled metal material decreases little or does not decrease.
It is preferable to be promoted .

By varying the inclination angle of the jet nozzle in this way, for example, by changing the inclination angle of the jet nozzle to a state close to vertical, the collision angle of the high-pressure jet fluid becomes smaller and the collision area decreases. However, the amount of temperature drop is reduced and the decrease in the surface temperature of the rolled metal sheet material is reduced. Conversely, by changing the inclination angle of the jet nozzle to a large state, the collision angle of the high-pressure jet fluid increases, the collision area increases, and the amount of temperature drop increases, reducing the surface temperature of the rolled metal sheet. Be promoted.

The adjustment of the inclination angle of the jet nozzle is carried out by detecting the surface temperature of the rolled metal sheet material by the temperature detecting means,
It is preferable that the inclination control means performs the operation based on the detection information.

By setting the inclination angle of the jet nozzle in the range of 15 to 75 degrees, it is possible to arbitrarily adjust the amount of decrease in the surface temperature of the rolled metal sheet material while maintaining the scale removal capability.

In order to achieve the above-mentioned object, the present invention also has a thin slab caster for continuously casting a slab from a molten metal, and a high-pressure fluid jet is discharged onto the slab surface to remove scale on the slab surface. Scale stripping device equipped with multiple jet nozzles, reduction mill for roughly rolling the slab, pendulum shear for cutting the roughly rolled strip to a specified length, and heating for heating the strip to a temperature above the finish rolling temperature. Finishing the strip with a furnace, a plurality of downcoils that wind the strip, and a plurality of jet nozzles that ejects a high-pressure fluid jet to the strip surface from the downcoiler to remove scale on the strip surface. A scale stripping device in a hot rolling facility in which a finishing mill row to be rolled is continuously arranged.
Has a preferable configuration .

In this case, at least one of the two scale peeling devices described above is provided with a slab (strip).
It is preferable that the scale peeling device is provided with first and second jet nozzles that are arranged so as to be inclined toward the downstream and upstream directions so that the two jets discharged toward the surface of the jet collide with each other.

When a slab having a scale is rolled, the scale is caught in the slab, which adversely affects the product. Therefore, according to the continuous casting apparatus of the present invention having the above-described structure, the scale is peeled off and a clean rolled material can be obtained.

The continuous arrangement of rolling mills has the advantages of reducing the length of the line, increasing the efficiency of the line, and reducing the amount of heating when reheating to the rolling temperature.

Further, when the nozzles are arranged so that the two jets collide with each other toward the slab surface, the collision range of the jets is expanded and the scale separation range is expanded, so that the scale separation performance is improved. Since scale is likely to be generated during hot rolling, a scale peeling device is installed there. Especially before the hot rolling equipment, it is most important because it has a large amount of scale (by reheating).

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION The hot rolling equipment according to the present invention will be specifically described below based on the embodiment shown in FIGS. First, an embodiment in which a scale peeling device is provided for a thin slab (strip) cast by a twin belt type continuous casting facility will be described with reference to FIG.

In FIG. 1, 1 is a twin belt type continuous casting type thin slab caster, 2 is a scale stripping device, 3 is a reduction mill (coarse mill), 4 is a pen drum shear, and 5
Is a heating furnace, and 6 is a down coiler for winding the cast thin slab. 7 is a finishing mill.

In the twin belt type continuous casting apparatus shown in FIG. 1, the molten metal is slabbed by the thin slab casters 1. The thin slab 11 emerging from this is stripped of scale by the scale stripping device 2 before entering the rough mill 3. The thin slab 11 is then sent to the finishing mill 7, passed through the scale peeling device 2 to finish rolling, and wound up. An arrangement example of the scale peeling device 2 is shown in FIG.

After roughly rolling the thin slab 11, the down coiler 6
The reason for winding once is because the difference in slab passing speed between continuous casting and finish rolling is large. The heating furnace 5
It is installed to bring the strip before winding to a finish rollable temperature.

In the scale peeling device 2 used in this embodiment, as shown in FIG. 2, the nozzles are arranged so that the two jets collide with each other toward the slab surface, and the collision range of the jets is widened. By expanding the scale peeling range, the scale peeling ability is improved.

Since scale is easily generated during hot rolling, the scale peeling device 2 is installed there. In particular, before the hot rolling equipment, a large amount of scale is attached (by reheating), which is important.

When a slab having a scale is rolled, the scale is caught in the slab, which adversely affects the product. Therefore, a scale peeling device is necessary. The continuous arrangement of rolling mills has the advantages of reducing the length of the line, increasing the efficiency of the line, and reducing the amount of heating when reheating to a rollable temperature.

Next, a concrete configuration example of the scale peeling apparatus used in the above embodiments will be described with reference to FIG. Figure 3
As shown in (1), a header 12 for injecting a scale peeling fluid and nozzle tips 13 arranged at equal intervals on the header 12 are installed on the hot rolled material 11 in pairs, one above the other.

The header 12 can change the angles θ1 and θ2 in the axial direction by ± 30 °. As a result, the collision angle of the flow 14 of the jet fluid jetted from the header 12 to the material 11 to be rolled is 30 with respect to the surface of the material to be rolled.
It can be changed in the range of 90 ° to 90 °. As standard conditions, both front and rear injection angles θ1 and θ2 are collided at an angle of 45 °, and the collision point interval is 20 mm.

According to this apparatus, when the total amount of water is equalized to 1400 liters / min and the header pressure is equal to 210 kgf / cm ² , the scale is scaled as compared with the conventional scale stripping apparatus in which one header is arranged on each of the upper and lower surfaces. The scale thickness after peeling has been reduced from 5.5 μm in the past to 3.8 μm in this scale peeling device.

Further, since all the sprayed water collides with each other and rises up from the material 11 to be rolled, a duct 16 is provided above the header 12 and a gutter 18 for recovering the jet fluid and the peeling scale is provided below the header 12. Blower fan 17 on one side of material 11
And the air is blown away, the peeling scale is not caught in the wake rolling mill and the rolled material 11 is never scratched.

Further, since the water as the jetting fluid does not scatter on the upper and lower sides of the material 11 to be rolled, it is possible to always use the temperature sensor of the material 11 to be rolled, the plate thickness gauge, the roll profilometer or the like. It was

Further, by rotating the header 12 to change the collision point interval, it becomes possible to change the plate thickness average temperature of ordinary steel of 30 mmt × 60 m / min within the range of 5 to 10 ° C. The jet fluid and the peeling scale collected in the duct 16 and the collecting gutter 18 are sent to the collecting port 15.

The present invention has been specifically described above based on the illustrated embodiments, but the present invention is not limited to these embodiments, and its specific structure is within the scope of the present invention shown in the claims. Needless to say, various modifications may be added to the configuration.

For example, in the above embodiment, the slab that has exited the slab caster 1, the strip from the down coiler 6,
Also, as the scale stripping device 2 provided for the strip passing through the finishing mill 7, one having jet nozzles inclined toward the downstream and upstream directions so that the two jets collide with each other is used, but this is not always necessary. It is not necessary for the scale peeling device to have such a configuration.

Further, in only one of the scale stripping devices, the jet nozzles may be arranged so as to be inclined so that the two jets collide with each other.

[0036]

As described above, in the hot rolling equipment of the present invention, since two jets are jetted so as to collide with each other from a large number of cylindrical jet nozzles arranged in parallel in the width direction of the strip, The collision range is expanded and the scale peeling range is expanded.

Further, since the two jets are separated from the strip by collision, the staying time of the jets on the strip surface is shortened so that the temperature drop of the strip can be reduced and the quality of the material to be rolled during hot rolling can be prevented. be able to.

Further, according to the continuous casting equipment of the present invention, since the scale adhering to the slab is effectively removed and then the rolling is carried out, the adverse effects of the scale can be satisfactorily removed.

[Brief description of drawings]

FIG. 1 is a system diagram showing an embodiment of a hot rolling facility of the present invention.

FIG. 2 is a schematic diagram showing an installed state of a scale peeling device in the hot rolling facility shown in FIG.

FIG. 3 is a perspective view showing a specific configuration of a scale peeling device used in the hot rolling facility shown in FIG.

FIG. 4A is a perspective view and FIG. 4B is a side view showing a structure of a scale peeling device in a conventional hot rolling facility.

[Explanation of symbols]

1 Thin slab casters 2 Scale peeling device 3 reduction mill 4 Pendrum Shear 5 heating furnace 6 down coiler 7 finishing mill 11 Rolled material (thin slab) 12 headers 13 nozzle tip 14 Flow of jet fluid 15 Collection port 16 ducts 17 Blower fan 18 Recovery gutter

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazuo Morimoto 4-6-22 Kannon Shinmachi, Nishi-ku, Hiroshima City Sanryo Heavy Industries Ltd. Hiroshima Research Laboratory (72) Inventor Jun Sakamoto 4-22, Kannon Shinmachi, Nishi-ku, Hiroshima Sansan Rishi Heavy Industry Co., Ltd. Hiroshima Works (72) Inventor Shinji Hirai 4-6-22 Kannon Shinmachi, Nishi-ku, Hiroshima City Sanryo Heavy Industry Co., Ltd. Hiroshima Factory (72) Inventor Junzo Fukumori 4-6 Kannon Shinmachi, Nishi-ku, Hiroshima City No. 22 Sanryo Heavy Industries Co., Ltd. Hiroshima Works (72) Inventor Hironori Fujioka 4-6-22 Kannon Shinmachi, Nishi-ku, Hiroshima City Sanryo Heavy Industries Co., Ltd. Hiroshima Works (72) Shinsaku Kimura 4 Kannon Shinmachi, Nishi-ku, Hiroshima City 6-22-22 Sanryo Heavy Industries Co., Ltd. Hiroshima Works (72) Inventor Akira Kaya 4-6-22 Kannon-Shinmachi, Nishi-ku, Hiroshima-shi Sanryo (56) References JP-A-7-51731 (JP, A) JP-A-8-52502 (JP, A) JP-A-7-178439 (JP, A) Actual flat 4-75602 (JP, U) (58) Fields surveyed (Int.Cl. ⁷ , DB name) B21B 45/08 B21B 1/00-11/00 B21B 13/22

Claims (6)

(57) [Claims] 1. Immediately before a row of hot rolling mills for rolling a metal material to be rolled, the two jet streams after collision with the surface of the metal material to be rolled are inclinedly arranged in the downstream and upstream directions so as to collide with each other , Pressurized by ejecting a high-pressure fluid jet onto the surface of the rolled metal material.
Comprises first and second jet nozzle for removing scale rolled metal material surface, the same jet nozzle is provided with a scale removing apparatus consisting of a number of tubular nozzle groups arranged in parallel in the width direction of the rolled metal material Hot rolling equipment. 2. A hot rolling facility, wherein the scale stripping device according to claim 1 is provided between rolling mills in a row of hot rolling mills for rolling a metal material to be rolled. 3. A scale stripping device according to claim 1 is provided between the first and second rolling mills of a row of hot rolling mills for rolling a metal material to be rolled. Facility. 4. The hot rolling facility according to claim 1, wherein the jet stream is water. 5. The scale exfoliation device according to claim 1, wherein the inclination angle of each of the first and second jet nozzles or any one of them is variably adjustable, and the surface temperature of the metal material to be rolled is reduced or reduced. The hot rolling equipment is characterized in that 6. A thin slab caster for continuously casting a slab from a molten metal, and a scale stripping device equipped with a plurality of jet nozzles for discharging a high-pressure fluid jet to the slab surface to remove scale on the slab surface, A reduction mill that roughly rolls the slab, a pendulum shear that cuts the roughly rolled strip to a predetermined length, a heating furnace that heats the strip to a temperature that allows finish rolling or higher, and a plurality of down coilers that wind the strip. , A scale stripping device equipped with a plurality of jet nozzles for discharging a high-pressure fluid jet to the strip surface from the down coiler to remove scale on the strip surface, and a finishing mill row for finish rolling the strip are arranged in series. In hot rolling equipment, direct at least one of the scale stripping devices toward the surface of the slab (strip). A hot stripping device comprising a first and a second jet nozzle arranged obliquely toward the downstream and upstream so that two jets discharged as a result collide with each other.