JP2817639B2 - Shaped steel cooling system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling device for water-cooling a section steel on a conveying roller table during hot rolling or after rolling.

[0002]

2. Description of the Related Art For example, an H-section steel has a shape in which a flange portion is thicker than a web portion and a connection portion (fillet portion) between the web portion and the flange portion has a large R portion.
Therefore, the difference in heat capacity between the flange portion and the web portion, the large heat capacity of the fillet portion, or the roll cooling water staying in the flange portion because the rolling is normally performed in the H position, etc., during the rolling of the H-section steel or during the rolling. During the subsequent conveyance, a temperature difference occurs between the flange portion and the web portion, so that a shape defect such as a web wave is likely to occur.

Similarly, in the case of unequal angle irons, the short side is thicker than the long side, and the fillet connecting the short side and the long side has a large R portion. For this reason, similarly to the H-section steel, a temperature difference is generated between the short side and the long side, and a shape defect is likely to occur. Further, as described above, since the cooling rates of the flange portion and the web portion are different depending on the fillet portion of the shaped steel, the material tends to vary.

[0004] In order to eliminate such shape defects and variations in materials, it is necessary to reduce the temperature difference between the web portion and the flange portion of the section steel. Cooling of the part from the outside is performed. 8 and 9 show an example of a conventional water cooling device for a flange portion of an H-section steel (The Iron and Steel Institute of Japan, Vol. 4 (1991, No. 5, P. 14)).
26-1429).

The apparatus shown in FIGS. 8 and 9 includes a roller table 1 near both ends on a roller table 2 for transporting an H-section steel 1.
The side guides 3, 3 provided with a plurality of slit-shaped through holes 4 in the vertical direction are arranged in the vertical direction, and a flat spray nozzle 6 (hereinafter referred to as a spray nozzle) for cooling a flange portion at a predetermined pitch behind and above the side guides. ) And headers 5, 5 in which spray nozzles 7 for fillet cooling are alternately provided, and the cooling water jetted from the spray nozzles 6, 7 is passed through through holes 4 of the side guides 3, 3. It is configured to collide with the flange portion of the H-beam 1 conveyed on the table 2 and cool it. The installation angle of the spray nozzles 6, 7 is obliquely downward so that the cooling water does not directly reach the web portion of the H-section steel 1. The arrows in the figure indicate the directions of movement of the headers 5 and 5 for performing predetermined guidance and cooling according to the size of the H-section steel 1.

When cooling the H-section steel by this cooling device, for example, the fillet portion is difficult to be cooled because of its large heat capacity. Therefore, a spray for cooling the fillet portion is further provided between the spray nozzles 6 for cooling the flange portion. A nozzle 7 is provided for cooling. That is, the spray nozzles 6 for cooling the flange and the spray nozzles 7 for cooling the fillet are alternately arranged.

[0007]

The conventional section steel cooling apparatus constructed as described above has the following problems. (1) To increase the line speed in order to improve the productivity of the line, it is necessary to shorten the nozzle pitch. However, as described above, the spray nozzles 7 for cooling the fillet having the nozzle pitch L ₂ (L ₁ = L ₂ ) are alternately provided between the spray nozzles 6 and 6 for cooling the flange with the nozzle pitch L _1. As a result, the nozzles cannot be arranged densely, which hinders an improvement in productivity.

(2) For example, even when cooling a section steel at the same line speed, in addition to the flange cooling water, approximately the same amount of fillet cooling water is required. Running costs increase. In other words, if the fillet portion can be effectively cooled with a part of the amount of water for cooling the flange, the required cooling water can be considerably reduced and the running cost can be reduced.

As a countermeasure against the above, it is conceivable to cover the entire passage of the cooling water with a water-permeable water dispersion plate. However, in this case, the cooling capacity of the flange portion is improved as in the case of the fillet portion. The temperature difference between the portion and the flange portion does not shrink, and the shape defect such as bending is still not improved.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and a shape steel capable of reducing the temperature difference between the flange portion and the fillet portion by efficiently cooling the flange portion and the fillet portion of the H-section steel. The purpose of the present invention is to obtain a cooling device. Further, the present invention provides a cooling device for a shaped steel capable of reducing the temperature difference between the short side and the long side by efficiently cooling the short side and the fillet portion of the unequal angle iron. It is intended.

[0011]

[Means for Solving the Problems]

(1) A cooling device for a shaped steel according to the present invention is provided with a plurality of spray nozzles at a predetermined pitch orthogonal to side guides arranged near both side ends on a roller table for transporting an H-shaped steel. In a cooling device for H-section steel, which supplies cooling water injected from the nozzle to a flange section of the H-section on the roller table through a slit-shaped through hole provided in the side guide to cool the flange section, the cooling section is provided on the side guide. A water dispersion plate having water permeability is provided at a position corresponding to the fillet portion of the H-shaped steel in the through hole.

(2) The cooling device for section steel according to the present invention has a predetermined pitch perpendicular to a side guard disposed near at least one side end on a roller table for conveying unequal angle iron. A plurality of spray nozzles are provided, and the cooling water injected from the spray nozzles is supplied to the short sides of the unequal angle iron on the roller table through the slit-shaped through holes provided in the side guide to cool the short sides. In a cooling device for angle irons, a water dispersion plate having water permeability is provided at a position corresponding to a fillet portion of an unequal angle iron in a through hole of a side guide.

(3) Further, in the shape steel cooling device of the above (1) and (2), the water dispersion plate is detachable.

[0014]

[Action]

(1) When the cooling water is injected from the spray nozzle, the cooling water passing above and below the water distribution plate passes through the through hole of the side guide and reaches the upper and lower portions of the outer surface of the flange portion of the H-section steel. On the other hand, part of the cooling water that has passed through the water distribution plate goes straight through the openings, and part of the cooling water collides with the members constituting the water distribution plate, changes the scattering direction, and passes through. Reach In this case, since the cooling water is spread at a wide angle by the water dispersion plate, the cooling water pattern formed on the flange portion has a cross shape, and the cooling ability of the fillet portion is improved.

(2) When the cooling water is sprayed from the spray nozzle, the cooling water passing below the water distribution plate passes through the through hole of the side guide and reaches the outer surface of the short side of the trapezoidal angle iron.
On the other hand, part of the cooling water that has passed through the water distribution plate goes straight through the openings, and part of the cooling water collides with the members that make up the water distribution plate, changes the scattering direction, and passes through. Reach the department. In this case, since the cooling water is spread at a wide angle by the water dispersion plate, the cooling water pattern formed on the short side has a T shape, and the cooling ability of the fillet portion is improved.

(3) Since the water dispersion plates of (1) and (2) are detachable, maintenance and replacement of the water distribution plates are easy.

[0017]

【Example】

Embodiment 1 FIG. 1 is an explanatory view of a first embodiment of the present invention, and FIG. 2 is a perspective view of a main part thereof. In the present embodiment, side guides 3, 3 provided with through holes 4 at a predetermined pitch are arranged near both ends of the flange portions 1a, 1a of the H-section steel 1 conveyed on the roller table 2, and thereafter, On the other hand, headers 5 and 5 provided with a plurality of spray nozzles 6 at the same pitch as the through holes 4 provided in the side guides 3 and 3 are provided, and a part of the through holes 4 (almost in the present embodiment). Provided with a water-permeable water dispersion plate 10.

The water dispersing plate 10 is preferably, for example, a mesh-like one such as a wire mesh or expanded metal. However, a plate-like liquid flow from the flat nozzle 6 such as a plate having a slit-like opening comes into contact. It is desirable that the resistance is not so large when passing.

In this embodiment, the water dispersion plate 10
Is shown in parallel with the surface of the side guide 3, but the present invention is not limited to this, and the plate-shaped cooling water injected from the spray nozzle 6 is H-shaped according to the dispersion characteristics of the water dispersion plate 10. What is necessary is just to attach so that the steel 1 may be disperse | distributed to the conveyance direction. Although the side guides 3 and 3 are omitted in FIG. 2 for easy understanding of the features of the apparatus, as shown in FIG.
If 0 is attached to the side guides 3, 3, it is advantageous in terms of maintenance (replacement due to deterioration of the water distribution plate 10) and construction.

In this embodiment as described above, when the H-section steel 1 is conveyed onto the roller table 2, the outer surface of the flange portion 1a is cooled by the cooling water jetted from the spray nozzle 6. At this time, in this embodiment, since the water dispersion plate 10 is disposed at substantially the center of the through hole 4 in the vertical direction, the cooling water sprayed from the spray nozzle 6 and passing above and below the water dispersion plate 10 is water. It passes through the through hole 4 without hitting the dispersion plate 10 and reaches the upper and lower portions of the outer surface of the flange portion 1a. On the other hand, a part of the cooling water sprayed from the spray nozzle 6 and passing through the central portion of the flange portion 1a, that is, the fillet portion, reaches the fillet portion through the aperture of the water distribution plate 10, and a part thereof. Water dispersion plate 10
And collides with the member constituting, changes the scattering direction, passes through, and reaches the fillet portion. In this case, the cooling water is the water dispersion plate 1
In order to spread to a wider angle by 0, the cooling water pattern 11
Has a cross shape as shown in FIG. 2, and the cooling ability of the fillet portion is improved.

The operation of the water dispersion plate 10 will be described in more detail with reference to FIGS. In the center of the through hole 4 having a height of 130 mm, a width of 40 mm and an opening of 8 mm × 5 as shown in FIG.
mm water dispersion plate 10 was installed, and a commercially available spray nozzle (flow rate 55 l / min, nozzle pressure 3 kg / cm ² G,
The header 5 to which the opening angle 60 °) 6 was attached at a pitch L = 200 mm was set such that the spray nozzle 6 was positioned 220 mm behind the side guide 3. The height of the flange 1a is 150 mm, and the thickness of the flange 1a is 16 mm.
mm, H-section steel with a web thickness of 6 mm, conveying speed 50 m
pm and cooled. FIG. 4 shows a state in which the cooling water is jetted from above at this time.

In the fillet portion located behind the water dispersion plate 10 by the water dispersion plate 10, a water cooling area 13 that is wide in the longitudinal direction that has passed through the water dispersion plate 10 and cooling water that does not pass through the water dispersion plate 10 are directly flanged. Water cooling area 12 that has reached part 1a
Are formed so that the cooling water pattern 11 has a cross shape. Then, the cooling capacity of the fillet portion having a large heat capacity is improved, and as a result, the flange portion 1a
The same temperature drop as the temperature drop of 155 ° C. at the lower part was obtained in the fillet portion.

For comparison with the present embodiment, the conventional cooling device shown in FIGS. 8 and 9, which can cool the fillet portion at the same level as the upper and lower portions of the flange portion, is used in the conventional cooling device shown in FIGS. Spray nozzle (flow rate 55 l / min, nozzle pressure 3 kg / cm ² G, opening angle 60 °) as spray nozzle 6 for cooling the flange, pitch L ₁ = 200
mm to the header 5, and in addition to this, a commercially available spray nozzle (flow rate 35 l / min, nozzle pressure 3 kg / c
(m ² G, opening angle 15 °) were alternately mounted on the header 5 at a pitch L ₂ = 200 mm as a spray nozzle 7 for cooling the fillet.

When the above-mentioned H-section steel was cooled by this cooling device, the same temperature drop as that of the upper and lower portions of the flange portion was realized in the fillet portion. However,
This apparatus requires a cooling water amount 1.6 times larger than that of the present embodiment, and it becomes clear that the equipment and the running cost are expensive.

Further, in this embodiment, by reducing the nozzle pitch L to 120 mm, the conveying speed is reduced to 75 mm.
Even when the speed was increased to mpm, the temperature drop at the flange portion and the fillet portion could be made 155 ° C. as in the case described above. However, in the comparative example, since the spray nozzles 7 for cooling the fillet are arranged between the spray nozzles 6 for cooling the flanges, the nozzle pitches L ₁ , L
It was not possible to make ₂ shorter. Thus, it has been found that the present invention is clearly superior in improving the efficiency of the equipment.

Embodiment 2 FIG. 6 is a perspective view schematically showing a second embodiment of the present invention.
FIG. 7 is an explanatory diagram of the operation. The same parts as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted. In the first embodiment, the case where the H-section steel is cooled by the cooling device according to the present invention has been described. However, in the present embodiment, according to the present invention, the unequal side angle steel whose short side 16 is thicker than the long side 17 is cooled. It was made. In the present embodiment, a plurality of spray nozzles 6 are attached at equal intervals to the short side 16 of a trapezoidal angle steel 15 conveyed on the roller table 2, and a header 5 installed in parallel with the trapezoidal angle steel 15. The cooling water is sprayed from above.

The unequal angle iron 15 also has a problem that the joint (fillet) between the short side 16 and the long side 17 has a large heat capacity similarly to the H-section steel, and the cooling is delayed more than other parts. Therefore, the water dispersion plate 10 is passed to a part of the passage of the plate-like cooling water injected from the spray nozzle 6, that is, in this embodiment, to the joint (fillet portion) between the short piece 16 and the long side 17 where cooling is to be enhanced. It was provided in the passage of the cooling water to reach. By providing this water dispersion plate 10, the spray pattern 18 of the water-cooled portion becomes T-shaped. Accordingly, since all the portions on the short side 16 side including the fillet portion are cooled at substantially the same cooling rate, uniform cooling can be performed without causing problems such as bending and uneven material. In the above description, the case where the headers 5 having the spray nozzles 6 are provided on both sides is shown, but they may be provided only on the short piece 16 side of the unequal angle iron 15. However, if it is provided on both sides as shown in the figure, this facility can also be used for cooling H-section steel.

In each of the above embodiments, one type of water dispersion plate 10 is used.
Is shown, but the effect of the present invention can be obtained even when one or more kinds of water dispersion plates are used in combination. Further, if the water dispersion plate 10 to be installed is detachable, it is convenient for maintenance and replacement. further,
The water dispersion plate 10 may be provided inside or outside the side guides 3, 3, and the side guides 3, 3 are integrally formed with the headers 5, 5, or installed independently of the headers 5, 5. This does not impair the effects of the present invention.

[0029]

The cooling device for section steel according to the present invention has the following effects. (1) Cooling water sprayed from a plurality of spray nozzles provided at a predetermined pitch is provided on the side guide at right angles to side guides arranged near both side ends on the roller table for transporting the H-section steel. In an H-beam cooling device that cools the flange by supplying the H-beam on the roller table through a slit-shaped through hole, the through-hole provided in the side guide corresponds to the H-beam fillet. Since the water dispersion plate having water permeability is provided at the position, each part of the H-section steel can be cooled at the same speed. For this reason, the temperature difference of each part is reduced, and the variation in the material due to a defective shape or uneven cooling can be reduced. Further, the equipment is simple, the equipment cost and the running cost can be reduced, and the equipment capacity can be increased.

(2) Also, a plurality of spray nozzles are provided at a predetermined pitch and are orthogonal to side guards arranged near at least one side end of the roller table for conveying the unequal angle iron. In the cooling device of the trapezoidal angle steel, which supplies the cooling water to the short side of the trapezoidal steel on the roller table through the slit-shaped through hole provided in the side guide to cool the short side, the penetration provided in the side guide is provided. Since the water dispersing plate having water permeability is provided at a position corresponding to the fillet portion of the unequal angle iron in the hole, substantially the same effect as in the case (1) can be obtained.

(3) Since the water dispersion plates of (1) and (2) are detachable, maintenance and replacement are easy.
The cost for that can be reduced.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a first embodiment of the present invention.

FIG. 2 is a perspective view showing a main part of FIG.

FIG. 3 is an operation explanatory view of the first embodiment.

FIG. 4 is an operation explanatory view of the first embodiment.

FIG. 5 is a plan view of an embodiment of a water dispersion plate forming a main part of the present invention.

FIG. 6 is an explanatory diagram of a second embodiment of the present invention.

FIG. 7 is an operation explanatory view of the second embodiment.

FIG. 8 is an explanatory view of an example of a conventional cooling device for H-section steel.

FIG. 9 is a perspective view showing a main part of the embodiment of FIG. 8;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 H-section steel 1a Flange part 2 Roller table 3 Side guide 4 Through hole 5 Header 6 Spray nozzle 10 Water distribution plate 11,18 Pattern 15 Non-equilateral angle iron 16 Short side 17 Long side

Claims (3)

(57) [Claims] 1. A plurality of spray nozzles are provided at a predetermined pitch orthogonal to side guides disposed near both side ends on a roller table for transporting an H-section steel, and cooling water jetted from the spray nozzles is provided. An H-section steel cooling device for supplying the H-section steel flange on the roller table through a slit-shaped through-hole provided in the side guide to cool the H-section, wherein the H of the through-hole provided in the side guide is provided. A shaped steel cooling device, comprising a water dispersion plate having water permeability at a position corresponding to a fillet portion of the shaped steel. 2. A plurality of spray nozzles are provided at a predetermined pitch orthogonal to a side guard disposed near at least one side end of a roller table for transporting a trapezoidal angle iron, and sprayed from the spray nozzles. The cooling water supplied to the short piece of the trapezoidal angle steel on the roller table through the slit-shaped through-hole provided in the side guide to cool the short side, and the cooling device for the trapezoidal angle iron is provided in the side guide. A water distribution plate having water permeability is provided at a position corresponding to a fillet portion of a trapezoidal angle iron having a through hole formed therein. 3. The cooling device for a shaped steel according to claim 1, wherein the water dispersion plate is detachable.