JPH07195111A - Device for controlling cooling water in inner surface of h-shape steel - Google Patents

Abstract

PURPOSE:To control cooling water in the inner surface of the upper part of a H-shape steel, and to enable the uniform cooling of the inner surface of the H-shape steel by the same cooling water controller to H-shape steels with different web widths. CONSTITUTION:Two independent members 5b which are arranged on a web 1, closely to the inner surface of a flange 2 and the upper surface of the web 1, have a height higher than the upper surface of the flange, and are equipped with nozzle parts 3 ejecting air as fluid for controlling cooling water on the inner surface side of the flange and on the upper surface side of the web, and one member 5a equipped with nozzle parts 3 having an area overlapped on an air blowing part to the upper surface of the web by the member 5b, are provided. Two of paired cooling water controllers 5 are provided along the longitudinal direction of a H-shape steel. Fluid for controlling cooling water, is ejected toward a part from the upper surface of the web to the height equal to the upper surface of the flange or more by the nozzle parts 3 on the inner surface side of the flange of the member 5b. Air is injected over all widths of the web by the nozzle parts 3 on the web side of the member 5b and the nozzle parts 3 of the member 5a. The member 5b is movable in the web width direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling water control device for manufacturing H-section steel, and more specifically, when water-cooling H-section steel in an H-shaped posture, the inner surface of the flange, which is the inner surface of the H-section steel, and the upper surface of the web. The present invention relates to a cooling water control device for the inner surface of an H-section steel for controlling the cooling water supplied to the.

[0002]

2. Description of the Prior Art Cooling water stays on the inner surface of the H-section steel at the time of manufacturing the H-section steel, and the cooling water flows on the upper surface of the web to non-uniformly cool the web, which causes a temperature difference in the longitudinal direction of the H-section steel. This causes a temperature difference between the flange and the web, which causes problems such as poor shape due to thermal stress and uneven performance due to uneven cooling.

Japanese Examined Patent Publication No. 5-73806 discloses a method of controlling the cooling water on the inner surface of the upper portion of the H-section steel by a device as shown in FIG. That is, it is described that the member 30 having a large number of holes 90 is arranged on the inner surface of the H-section steel upper portion, and the cooling water on the inner surface of the H-section steel upper portion is blocked by blowing out air from the holes 90.

[0004]

However, in the apparatus shown in FIG. 8, as described in Japanese Patent Publication No. 5-73806, the member 30 must be replaced every time the web width of the H-section steel changes. I have to.

The present invention has been made in view of the above circumstances, and it is possible to control the cooling water on the upper inner surface of the H-section steel by the same cooling-water control device for the H-section steels having different web widths. It is an object of the present invention to provide a cooling water control device for the inner surface of an H-section steel that enables uniform cooling of the inner surface of the H-section steel.

[0006]

In order to solve the above-mentioned problems, the present invention provides a cooling water for the inner surface of H-section steel when the H-section steel is water-cooled in the H-shape posture in the cooling process at the time of manufacturing the H-section steel. A control device, which is arranged on an H-shaped steel web in proximity to the inner surface of the flange and the upper surface of the web, has a height equal to or higher than the upper surface of the flange, and controls cooling water on the inner surface of the flange and the upper surface of the web. Two independent side surface cooling water control members each having a nozzle portion for injecting a fluid, and a nozzle portion of the side surface cooling water control member are independent of each other, and for controlling the cooling water to the upper surface of the web by the side surface cooling water control member. A web upper surface cooling water control member having a nozzle portion having an overlapping region in a fluid ejection portion, and two cooling water control portions forming a pair along the longitudinal direction of the H-section steel, Side cooling water control member The nozzle portion on the inner surface of the lunge injects a cooling water control fluid from the web upper surface to a height of the flange upper surface or higher, and the nozzle portion on the web side of the side surface cooling water control member and the nozzle portion of the web upper surface cooling water control member, Provided is a cooling water control device for an inner surface of an H-section steel, characterized in that the cooling water control fluid is jetted over the entire width of the web and the side surface cooling water control member is movable in the web width direction.

The cooling water control unit 5 forming a pair with this cooling water control device is typically composed of three parts as shown in FIG. That is, the two side surface cooling water control members 5
b and the web upper surface cooling water control member 5a provided between them. Reference numeral 6 is a fluid supply pipe for controlling cooling water.

The central web upper surface cooling water control member 5a is
As shown in FIG. 2, a cooling water control fluid is jetted from the slit nozzle 3 as a nozzle portion toward the upper surface of the web. As shown in FIG. 3, the outer side surface cooling water control device 5b injects a cooling water control fluid from the slit nozzle 3 as a nozzle portion toward the inner surface of the flange and the upper surface of the web.

Further, as shown in the schematic cross-sectional view seen from the web side in FIG. 4, the web side slit nozzles (nozzle portions) are provided in the three cooling water control members, and the inner web upper surface cooling water control member is provided. The slit nozzle (nozzle part) 3 of 5a and the slit nozzle (nozzle part) 3 on the web side of the outer side surface cooling water control member 5b have a region overlapping with respect to the cooling water control fluid blowing direction to the upper surface of the web. . The outer side cooling water control member 5b is movable in the width direction of the H-section steel.

[0010]

In the cooling water control device of the present invention, since the pair of cooling water control parts are arranged close to the inner surface of the flange and the upper surface of the web, the cooling water control device itself has an effect of blocking the cooling water. That is, the cooling water control fluid is jetted from the nozzles to the inner surface of the flange and the upper surface of the web, and the cooling water is controlled between the pair of cooling water control units by setting the height of the cooling water control device to be higher than the upper surface of the flange. Be blocked by. The cooling water is finally drained by overflowing from the upper surface of the flange.

The cooling water controller is composed of three independent parts as shown in FIG. The outer surface cooling water control member 5b shown in FIG. 3 can be moved in the web width direction, and the same cooling water control device can be applied to H-section steels having different web widths. As shown in FIG. 4, the web side nozzle portion is provided on the above three cooling water control members, and the nozzle portion 3 of the inner web upper surface cooling water control member 5a and the outer side surface cooling water control member 5b of the web side are provided. Since the nozzle portion 3 has a region overlapping with respect to the cooling water control fluid blowing direction to the upper surface of the web, cooling is performed even if the nozzle portions of the two outer side surface cooling water control members 5b move in the web width direction. Cooling water does not leak from the bottom surface of the water control device.

The optimum values of the distance between the cooling water control device and the inner surface of the flange and the upper surface of the web are the cooling water control fluid such as the type, flow rate and pressure of the cooling water control fluid, and the cooling water control such as the slit spacing and the fluid injection angle. Although it depends on the shape of the device and the running accuracy of the H-section steel, it is often desirable that the length is 10 mm or more and 50 mm or less.

As shown in FIGS. 6 and 7, the outlet angle θ of the fluid blown out from the cooling water control device leaks at the flange and the web so as to give momentum against the cooling water which is about to leak. It is desirable that the direction is 90 ° or more and 150 ° or less with respect to the flow direction of the cooling water that is about to come out. However, the optimum value of this setting varies depending on the type, pressure, flow rate, etc. of the fluid blown out from the cooling water control device, the nozzle shape of the cooling water control device, the cooling water control device, the flange, and the web spacing.

Although not shown in FIGS. 1, 2 and 3, a rectifying plate or the like is provided inside each cooling water control device as needed so that the fluid is uniformly and appropriately blown out from the nozzle. Measures may be taken.

The nozzle shape of the nozzle portion may be a slit, a porous member or the like, but in many cases, the cooling water can be controlled most efficiently and completely by appropriately selecting the slit shape.

In the online cooling of the H-section steel using this cooling water control device, the H-section steel may be run and the cooling-water control device may be fixed at a specific location, or conversely, the H-section steel may not be run. By fixing and cooling the H-section steel while moving the cooling water control device, or by cooling the H-section steel while moving both the H-section steel and the cooling water control device in the same direction or opposite directions. It goes without saying that the same effect can be obtained.

By controlling the cooling water by the cooling water control device according to the present invention, the conventional problem H
Since it becomes possible to uniformly cool the inner surface of the shaped steel, by using the cooling water control device according to the present invention,
Regarding the cooling of the outer surface of the H-section steel and the lower surface of the H-section steel, it is possible to perform sufficiently uniform cooling by cooling with a known spray nozzle or the like. Regarding the cooling of the outer surface of the H-section steel, the outer surface of the H-section steel is cooled by a known spray nozzle or the like at an intermediate position between the pair of cooling water control units in the cooling water control device according to the present invention, so that the flange outer surface can be cooled. There is no problem of splashing of cooling water from the spray nozzle or the like. Further, regarding the cooling of the lower surface of the H-section steel, all the cooling water splashes downward so that the cooling does not become uneven. However, it goes without saying that it is necessary to set conditions such as the flow rate and the injection angle for cooling the outer surface of the H-section steel and the lower surface of the H-section steel in accordance with the conditions such as the dimensions of the H-section steel.

Air is the most common fluid for controlling cooling water, but other inexpensive fluids such as water may be used. However, for example, when water is used, the blowing angle from the nozzle of the cooling water control device must be adjusted.

It is also possible to partition the nozzle portions on the web side and the flange side of the side surface cooling water control member and control them independently. By doing so, it becomes possible to improve the controllability of the cooling water on the flange side and the web side of the side surface cooling water control device and to control at a more appropriate flow rate. Further, in this case, the cooling water control fluid may be air on the web side and water on the flange side.

By adopting the cooling water control device for the inner surface of the H-section steel according to the present invention, in the conventional invention shown in FIG. 8, the apparatus must be replaced every time the web width of the H-section steel changes. On the other hand, by adopting a multiple structure in which the nozzle portion on the web side is overlapped as described above, it has become possible to handle H-section steels having different web widths with the same device.

[0021]

EXAMPLE FIG. 5 and FIG. 6 show the results of actually controlling the cooling water on the upper surface of the H-section steel in the water-cooling process after rolling at the time of manufacturing the H-section steel using the cooling water control device for the inner surface of the H-section steel according to the present invention. , Fig. 7
Shown in.

Here, the flange height B = 600 mm,
Web thickness t ₁ = 30 mm, flange thickness t ₂ = 30 m
Two types of H-section steels 10 having different web widths H of 600 mm and 700 mm and having different sizes were moved in a water cooling zone at a speed of 20 m / min to perform cooling. Cooling of the H-section steel was performed using a plurality of known spray nozzles from above the H-section steel toward the flange surface.

The pair of cooling water control parts 5 of the cooling water control device have a space of 20 mm between the inner surface of the flange 2 and the upper surface of the web 1.
The height was 35 mm higher than the upper surface of the flange. Each cooling water control unit 5 of the cooling water control device includes a slit nozzle 3 for injecting air toward the inner surface of the flange 2 of the H-section steel 10 and the upper surface of the web 1, and a supply system and a control system for those compressed air. Composed. However, the compressed air supply system and control system are not shown.

As shown in FIG. 6, in this cooling water control device, cooling water control units 5 were arranged in pairs at intervals of 4 m. In this example, air was blown from a slit nozzle having a slit interval of 2 mm. As described above, each cooling water control unit 5 of this cooling water control device has two side surface cooling water control members 5b and one web upper surface cooling water control member 5a provided therebetween. Is.

When the web width H = 600 mm, the flow rate is 4.3 m ³ / min for each of the two side cooling water control members 5b,
The web upper surface cooling water control member 5a has a pressure of 3.5 m ³ / min, and the side surface cooling water control member 5b has a pressure of 3.4 kg / cm.
² G, 3.2kg / c web upper surface cooling water control member 5a
m ² G.

Next, without changing the cooling control device, the side surface cooling water control member 5b is moved in the web width direction to adjust the distance between the H-section steel and the side surface cooling water control device to 20 mm, and then the web width H = 700 mm H-section steel was cooled. The flow rate of each of the two side surface cooling water control members 5b was 4.7 m ³ / min, and the flow rate of the web upper surface cooling water control member 5a was 3.
7 m ³ / min, the pressure is 3.5 kg / cm ² G for the side surface cooling water control member 5 b, and the web upper surface cooling water control member 5 a
Was 3.3 kg / cm ² G.

In each case, the injection angle θ was set to 135 ° from the flange and the web with respect to the flow direction of the cooling water which was about to leak.

The cooling water was completely blocked in the region sandwiched by the cooling water control section 5 on the upper surface of the web 1 regardless of the web width. The blocked cooling water was removed by overflowing from the flange 2.

At this time, the temperature transition of each portion of the web and the flange 2 mm below the surface on the exit side of the cooling zone was measured by using a thermocouple. When the web width H = 600 mm, the maximum was 1
At 1 ° C. and H = 700 mm, the temperature difference was within the maximum temperature difference range of 14 °.

Further, when the temperature transition of each part on the surface of the web and the flange on the outlet side of the water cooling zone was measured by using a radiation thermometer, a maximum of 15 ° C. and H = 700 m at H = 600 mm.
In m, the temperature difference was within the maximum temperature difference range of 17 ° C.

[0031]

As described above, according to the present invention, the cooling water can be blocked between the pair of cooling water control portions on the web of the H-section steel, so that the cooling water on the inner surface of the H-section steel is cooled. Can be controlled effectively and the inner surface of the H-section steel can be cooled uniformly. Furthermore, since the side surface cooling water control members provided on both sides of each cooling water control unit can be moved according to the web width without leakage of the cooling water, it is possible to cope with H-section steels having different web widths. .

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a configuration of a cooling water control unit forming a pair of a cooling water control device according to the present invention.

FIG. 2 is a schematic diagram showing a web upper surface cooling water control member that constitutes a central portion of the cooling water control unit of FIG. 1 and a nozzle position thereof.

FIG. 3 is a schematic diagram showing a side surface cooling water control member that constitutes an outer side portion of the cooling water control unit in FIG. 1 and a nozzle position thereof.

FIG. 4 is a diagram schematically showing a cross section of one cooling water control unit of the cooling water control device according to the present invention when viewed from the web side.

FIG. 5 is a schematic view showing an arrangement position of one cooling water control unit of the cooling water control device according to the embodiment of the present invention.

FIG. 6 is a vertical sectional view schematically showing the arrangement of the cooling water control device according to the embodiment of the present invention.

FIG. 7 is a schematic diagram showing an injection angle of a cooling water control fluid on the inner surface side of the flange of the cooling water control device according to the embodiment of the present invention.

FIG. 8 is a view showing a state in which a conventional cooling water control device is arranged on the inner surface of an H-shaped steel.

[Explanation of symbols]

1 ... Web, 2 ... Flange, 3 ... Slit nozzle, 4 ...
Spray nozzle, 5 ... Cooling water control unit, 5a ... Web upper surface cooling water control member, 5b ... Side cooling water control member, 6 ... Fluid supply pipe, 10 ... H-section steel.

Claims (1)

[Claims] 1. A cooling water control device for the inner surface of an H-section steel in the case of water-cooling the H-section steel in an H-shaped posture in the cooling process during the production of the H-section steel, comprising: Two independent side surface cooling waters arranged close to the upper surface of the web, having a height equal to or higher than the upper surface of the flange, and having nozzle portions for injecting a cooling water control fluid to the inner surface side of the flange and the upper surface side of the web. One of a control member and a nozzle portion that is independent of the nozzle portion of the side surface cooling water control member and has a region that overlaps with the cooling water control fluid blowing portion to the web upper surface by the side surface cooling water control member A web upper surface cooling water control member is provided, and two cooling water control parts that are paired along the longitudinal direction of the H-section steel are provided. The nozzle part on the inner surface side of the flange of the side surface cooling water control member is located on the upper surface of the web. Flange Injecting cooling water control fluid to a height higher than the surface, the nozzle portion on the web side of the side surface cooling water control member and the nozzle portion of the web upper surface cooling water control member are combined and the cooling water control fluid over the entire width of the web. And the side surface cooling water control member is movable in the web width direction.