JPH0510966Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention is applied to the final rolling line for producing sections with flanges, such as H-section steel, I-section steel, channel steel, etc., by hot rolling. The present invention relates to a flange cooling device for sectioned steel installed before or after a finishing rolling mill or an intermediate rolling mill.

[Prior Art] When hot rolling steel sections with flanges, such as H-section steel, I-section steel, and channel steel, using a universal rolling mill, large residual stress occurs after cooling, and defects in cross-sectional shape and length It is known that directional bending or web waves may also occur. The main reason for this is that the wall thicknesses of the web and flange in the cross section of the rolled material are different, and the difference in wall thickness causes a difference in heat capacity during or after rolling, making it difficult to cool the thin-walled part (generally the web part). First, after cooling of the thin wall part is almost completed, the thick wall part (generally the flange part) is cooled.
This is because the material shrinks on cooling, and this shrinkage stress in the thicker portions also has a large effect on the thinner portions. As a means to solve such conventional problems, in an example targeting H-beam steel, there is a structure in which a cooling nozzle is provided in the side wall opening of the side guide guiding to each rolling mill, as disclosed in Japanese Patent Publication No. 41-20336. Alternatively, the structure disclosed in Japanese Utility Model Publication No. 45-18679 is well known, in which a bent pipe is rotatably screwed into a cooling header pipe provided on both sides of a passage for a rolled material.

By the way, in recent years in the field of section steel rolling, so-called thin-walled webs H with a web-to-flange thickness ratio of 3 or more have been developed.
Technological developments are progressing in the manufacturing of shaped steel and the improvement of shape and material quality through cooling control, but in order to meet these new needs, each of the conventional cooling methods described above requires cooling control of the cooled part of the shaped steel. It was found that the accuracy was not sufficient. In other words, there has been a demand for cooling means that are more advanced than the conventional manufacturing technology for rolled shaped steel.

[Problems to be solved by the invention] The invention solves the following problems when rolling a section steel having a flange.
In particular, in order to manufacture thin-walled H-section steel or improve its shape and material quality through cooling control, we aim to make the cooling condition uniform for the left and right flanges, and for the lengthwise direction of the section steel, as well as for the flange surface and cooling nozzle. The purpose of the present invention is to provide a flange cooling device that can achieve constant spacing between the two.

[Means for Solving the Problems] The present invention has solved the above problems, and the gist is that the present invention solves the above problems. In the flange cooling device for rolled shaped steel, the frame is provided along the transfer line and is movable back and forth in a direction perpendicular to the transfer line, and is equipped with a cooling nozzle that injects cooling water facing the flange surface of the shaped steel. a constant pressure applying device that applies a constant pressure in a direction perpendicular to the transfer line; one end of the constant pressure applying device is rotatably supported on the constant pressure applying device, and the other end is rotatably supported on the frame in a horizontal plane; A shaft-supported L-shaped link piece and a vertical guide roller rotatably supported on a bent portion of the link piece are provided so that a part of the rolling surface thereof protrudes from the side surface of the frame. This is a flange cooling device for rolled section steel.

[Operation/Example] The operation of the device of the present invention will be explained in detail based on an example.

Figure 2 shows the overall configuration of a universal rolling equipment row for H-section steel equipped with the cooling device 1 of the present invention. After being rolled in each rolling mill of the machine, it passes to the universal finishing mill 3. A straight line 4 indicates a rolling line, and 7 indicates side guide devices provided on the front and rear surfaces of the final rolling mill 3. This final finishing rolling mill 3 is composed of horizontal rolls 3a and vertical rolls 3b, and the material to be rolled is rolled in one pass in an H position, and the flange is raised perpendicular to the web axis for final finishing. . 5 is a hot saw cutter that cuts the rolled product into a predetermined length, and 6 is a cooling bed. This embodiment shows a case where the cooling device 1 of the present invention is disposed along a conveyance line downstream of a finishing rolling mill 3.

Figures 1a and 1b show details of the device of the present invention, in which frames 9 are provided on the left and right sides of the H-section steel 2, which is conveyed by a roller table 8 and is to be cooled. Depending on the device,
It is provided so as to be able to move forward and backward in a direction perpendicular to the conveyance line direction () of the H-section steel 2, that is, with respect to the flange surface 2a of the H-section steel 2. A plurality of nozzle headers 10 are provided in the direction of the conveyance line of the frame 9, and cooling nozzles 10a are opposed to the nozzle headers 10 so as to obtain a sprinkling area of a constant width on the flange surface 2a of the H-shaped steel 2. installed. Note that the water supply port 10 of the nozzle header 10
A water supply pipe and an on-off valve (not shown) are connected to b. One end of the L-shaped link piece 11 is rotatably supported in a horizontal plane on a support shaft 12 provided on the frame 9, and the other end is connected to a constant pressure applying device 13 using a hydraulic cylinder or the like via a rod 15. connected. The guiding vertical roller 14 is connected to the link piece 11
It is rotatably supported on a bent portion of the frame 9, and a part of its rolling surface protrudes from the side surface of the frame 9 by a certain distance t. This protrusion distance t
is preferably less than or equal to the radius of the vertical guide roller 14.

The operation of the cooling device of the present invention when cooling the H-section steel 2 will be described in detail below.

Prior to the start of cooling, the left and right guiding vertical rollers 1
The positions of the left and right frames 9, 9 are set in advance so that the distance 1 between the left and right frames 9, 14 is slightly larger than the full width (web height W) of the H-section steel 2. When the tip of the H-shaped steel 2 that has left the final rolling mill 3 reaches the starting end of the cooling device 1, cooling water starts to be sprayed from the cooling nozzle 10a. The flange surface 2a of the H-beam 2 is cooled while passing through the cooling device 1 by the kicking force of the final finishing mill 3 and the conveying force of the roller table 8. During this cooling process, the flange surface 2a of the H-section steel is held and guided by the left and right guiding vertical rollers 14, so that the flange surface 2a and the cooling nozzle 10a
The distance between them is maintained constant. Also, H before cooling
If the section steel 2 is bent left and right in the length direction,
The guide vertical roller 14 serves as a correction roller and corrects the bend. If the degree of bending is large, or if only the ends in the length direction are bent, the vertical guiding roller 14 is supported by the constant pressure applying device 13, as shown by the imaginary line in FIG. 1a. The guiding vertical roller 14 is retracted to this position, and excessive impact force can be absorbed. That is, since a part of the rolling surface of the vertical guide roller 14 protrudes from the side surface of the frame, the impact force when the H-shaped steel collides with the vertical guide roller 14 is reduced. In addition, the moment arm, which has one end of the link piece pivoted on the frame as a fulcrum and the other end pivoted on the constant pressure application device as the point of action, is configured to be larger than the moment arm up to the support shaft of the vertical guide roller. Therefore, the impact force that the constant pressure application device receives during a collision is alleviated. In addition, in order to deal with such a case, the constant pressure applying device 13
When a hydraulic cylinder is used, a relief valve may be provided in the hydraulic line, and the relief valve may be opened when the force received from the vertical guide roller 14 exceeds a certain hydraulic pressure setting value.

In the above embodiment, the case where the cooling device 1 of the present invention is installed at the downstream stage of the finishing rolling mill 3 has been explained, but if necessary, it can also be used at the upstream stage of the finishing rolling mill 3, or at an intermediate stage before the finishing rolling mill. It can also be applied to the front and rear stages of the rough rolling mill.

[Effects of the invention] Although the device of the invention has a simple structure, when cooling the flange surface of a section steel, the distance between the flange surface and the cooling nozzle can be maintained constant, so the cooling accuracy is greatly improved. Since it absorbs and alleviates the impact force caused by contact or collision with the material to be cooled, it has practical effects such as less occurrence of equipment failure.

[Brief explanation of the drawing]

1A and 1B show the device of the present invention; a is a schematic plan view with only the left half of the device partially cut away; FIG. 1B is a schematic front view; and FIG. 2 is a schematic plan view of a rolling process to which the device of the present invention is applied. 1... Cooling device, 2... Rolled material (H section steel),
3... Finish rolling machine, 5... Saw cutting machine, 6... Cooling bed, 7... Side guide device, 8... Roller table, 9... Frame, 10... Nozzle header, 10a... Cooling nozzle, 11 ...link piece,
12... Support shaft, 13... Constant pressure applying device, 14...
...Induction type roller, 15...rod.

Claims (1)

[Scope of utility model registration request] A frame that faces the flange surface of the section steel is installed along both sides of the front and rear surfaces of the section steel rolling mill, or both sides of the material transfer line to be cooled on either the front or rear sides, and is movable in a direction perpendicular to the transfer line. In the flange cooling device for rolled section steel equipped with a cooling nozzle that injects cooling water, the frame includes a constant pressure applying device that applies a constant pressure in a direction perpendicular to the transfer line, and one end of the constant pressure applying device. an L-shaped link piece which is rotatably supported on the frame and whose other end is swingably supported on the frame in a horizontal plane; and a guide vertical roller rotatably supported on the bent part of the link piece. A flange cooling device for rolled section steel, characterized in that a part of the rolling surface thereof projects from a side surface of the frame.