JPH09267106A - Device for cooling rolling roll of hot rolling mill - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve controllability of thermal crow of a rolling roll and to prevent the deterioration of crown ant shape of a rolled stock by making flow- down water flow in the direction of the line center using skew nozzles for the spray nozzles of a cooling header. SOLUTION: The spray nozzles 2a of a main header 3a are arranged symmetrically on both sides of the line center LC, skew nozzles with which cooling water flows in the direction of the center line LC, that is, the cooling water is spread only on one side are used and their flow rates are supplied so as to be able on or off with a water supply piping. Further, by inclining the nozzle itself in the direction of the line center LC as shown in the part A, structure is taken so that the flow-down water is not spread to the outside of the cooling range.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a rolling roll cooling device for a hot rolling mill.

[0002]

2. Description of the Related Art Conventionally, as a roll cooling device for a hot rolling mill, as shown in FIG. 5, a plurality of spray nozzles 2 are attached on the inlet side or outlet side of a rolling roll 1 or both sides thereof in the axial direction of the roll. Generally, the cooling header 3 and the warp guide 5 having a drainer wiper 4 attached to the tip thereof are arranged and configured. Cooling of the rolling roll 1 is carried out by cooling water which is sprayed from the spray nozzle 2 of the cooling header 3 and directly hits or flows down the roll surface, and accumulated water which is retained between the warp guide 5 and the rolling roll 1.
In addition, 7 is an entrance side guide.

The cooling header 3 is divided into a plurality of parts in order to control the thermal crown of the rolling roll 1 and to change the cooling area in the roll axial direction, and cooling water can be turned on and off for each of them. There are some that can change the flow rate. Further, in general, in the spray nozzle 2, as shown in FIGS. 6 (a) and 6 (b), the jet flow has a divergent angle with respect to the center line of the nozzle, and the spray pattern S on the roll surface is adjacent to the jet. The arrangement is twisted with respect to the horizontal plane so as not to overlap with the flow.

Further, since the warp guide 5 has a role of guiding the rolled material, as shown in FIG. 7, the warp guide 5 is arranged so as to spread from immediately below the upper rolling roll 1 to the pass line, and has a roll diameter. It has a function of rotating around the fulcrum 6 so that it can respond to changes in
Alternatively, an air cylinder (not shown) or the like has a structure in which the water drain wiper 4 at the tip thereof is constantly pressed against the roll surface.

[0005]

However, in the above-mentioned conventional example, the cooling header 3 is divided in the axial direction of the roll and the cooling range is changed according to the width of the rolled material to control the thermal crown of the rolling roll 1. In this case, since the jet flow of the spray nozzle has a symmetric divergence angle, there is a problem that the effluent water spreads to the outside and a range wider than the rolled material width region is cooled to lower the effect of controlled cooling.

Further, for example, in Japanese Unexamined Patent Publication No. 54-23060, as shown in FIG. 8, the shielding plate 9 is provided on the roll surface so that the spray water does not directly hit the rolling roll 1 on the outer side of the strip passing area. It is disclosed that it is arranged so that
However, in this case, the spray water, after hitting the roll surface, spreads in the left-right direction along the roll surface, and eventually the roll surface is cooled in the shielding plate 9. Also, the shielding plate 9
There is a problem in that it is difficult or impossible to exchange with rolling rolls having different diameters when the circular arc is formed along the roll surface.

[0007]

According to the present invention, there is provided a rolling roll cooling device for a hot rolling mill comprising a cooling header having a plurality of spray nozzles and a warp guide having a draining wiper attached. A main header corresponding to a small width portion and a plurality of divided headers at both ends of the main header are equally divided, and the spray nozzle is of a type that allows cooling water to flow toward a line center. It is a rolling roll cooling device of a hot rolling mill.

A wiper for preventing accumulated water is preferably attached to the warp guide, and an oblique nozzle is preferably used as the spray nozzle.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the drawings. FIG.
Is a plan view showing an outline of a rolling roll cooling device according to the present invention, and FIG. 2 is a side view thereof. In the drawings, the same members as those in the conventional example are designated by the same reference numerals and the description thereof will be omitted.

The water cooling header 3 of the rolling roll cooling device of the present invention comprises a main header 3a for cooling the minimum strip width portion, and divided headers 3b, 3c connected to both sides of the main header 3a in the roll axial direction. To be done. The spray nozzles 2a of the main header 3a are symmetrically arranged about the line center LC so that the cooling water flows in the direction of the line center LC, that is, the oblique nozzle that spreads only to one side of the line center LC. Is used, and its flow rate is supplied by the same water supply pipe 11 so that it can be turned on and off.
Further, the nozzle itself is tilted in the direction of the line center LC as shown in an enlarged view to the portion A so that the flowing water does not spread outside the cooling range.

The divided headers 3b and 3c on both sides are divided into a plurality of, for example, n pieces at equal pitches, and their spray nozzles 2b and 2c have the same cooling water as the spray nozzle 2a of the main header 3a. An oblique nozzle is arranged so as to flow in the direction. And the division header 3
The spray nozzles 2b and 2c symmetrically arranged at the line centers LC of b and 3c are individually turned on / off via the on / off valve 13 through the same feed pipe 12. As a result, the on / off valve 13 is operated to turn off the spray nozzles 2b and 2c outside the strip width of the rolled material so that the cooling water does not flow outside the strip passing region of the rolling roll 1. can do.

At this time, if the cooling water having a temperature higher than that of the main header 3a in the central area is supplied to the divided headers 3b, 3c in the both end areas of the strip passing area, the thermal crown of the rolling roll 1 is provided. The controllability of can be improved. Further, as shown in FIG. 2, it is preferable that a staying water preventing wiper 14 is attached above the warp guide 5 and operated by an air cylinder 16 via a link mechanism 15. As a result, even if the roll diameter is different, it can always be pressed against the roll surface.
By allowing cooling water to stay in the triangular portion formed by 14 and the warp guide 5, it is possible to prevent the falling water from coming into contact with the rolling roll 1.

By making the connection between the accumulated water preventing wiper 14 and the camber guide 5 rotatable, it is necessary to perform thermal crown control by heating the entire rolling roll 1 when rolling a wide material, for example. If not, the accumulated water preventing wiper 14 can be separated from the roll surface to enable strong cooling of the entire roll with accumulated water. In the above example, the spray nozzle is an oblique nozzle.However, the present invention is not limited to this.For example, a normal rectangular nozzle is attached at a predetermined angle to spread the spray water outside the cooling range. It may be omitted, and any other embodiment may be used as long as it fits the gist of the present invention.

[0014]

EXAMPLE A rolling roll cooling device of the present invention was applied when 80 rolled materials having the plate width configuration shown in FIG. 3 were rolled according to the rolling order. The minimum plate width area of the main header 3a is set to 800 mm, and the eight spray nozzles 2a are attached to the main header 3a.
A total of 16 spray nozzles 2b and 2c were installed at mm intervals, and the nozzles were turned on and off according to the plate width. A stay water preventive wiper 14 was also attached.

The calculation result of the thermal crown (μm / diameter) per roll diameter (mm) at the position 25 mm from the plate edge of the rolled material at this time is shown in FIG. 4 as the case where there is no influence of accumulated water by Δ mark. It was The circles in the figure are for comparison.
It is a result when there is an influence of the accumulated water only by the conventional warp guide shown in FIG. As can be seen from FIG. 4, the thermal crown when the influence of the accumulated water in the present invention example is removed is about 30 μm / diameter of about 70 out of 80 rolled materials, and the control effect is improved. Has been done.

[0016]

As described above, in the present invention, the accumulated water between the warpage guide and the rolling roll is removed, and the oblique water nozzle is used as the spray nozzle of the cooling header so that the flowing water flows toward the line center. Therefore, the controllability of the thermal crown of the rolling roll is improved, and the deterioration of the crown / shape of the rolled material can be prevented, which contributes to the improvement of product yield and quality.

[Brief description of drawings]

FIG. 1 is a plan view showing an outline of a rolling roll cooling device according to the present invention.

FIG. 2 is a side view of FIG.

FIG. 3 is a graph showing a strip width configuration of a rolled material to which the present invention is applied.

FIG. 4 is a graph showing a thermal crown control effect according to the present invention.

FIG. 5 is a side view showing an outline of a roll cooling device of a conventional hot rolling mill.

FIG. 6A is a plan view showing a conventional spray nozzle, and FIG.
It is a front view which shows a spray pattern.

FIG. 7 is a side view showing the structure of a conventional camber guide.

FIG. 8 is a side view showing the structure of a conventional shield plate.

[Explanation of symbols]

 1 Rolling roll 2 Spray nozzle 2a, 2b, 2c Spray nozzle (oblique nozzle) 3 Cooling header 3a Main header 3b, 3c Split header 4 Drain wiper 5 Upward warp guide 6 Support point 7 Entry side guide 8 Balance weight 11, 12 Water supply pipe 13 ON / OFF valve 14 Wipe for preventing accumulated water 15 Link mechanism 16 Air cylinder S Spray pattern

Claims (3)

[Claims] 1. A rolling roll cooling device of a hot rolling mill comprising a cooling header having a plurality of spray nozzles and a warp guide having a draining wiper attached, wherein the cooling header is a main header corresponding to a minimum width portion. It consists of a divided header that is divided into multiple equal intervals at both ends,
A rolling roll cooling device for a hot rolling mill, characterized in that a nozzle of a type in which cooling water flows toward a line center is used as the spray nozzle. 2. A rolling roll cooling device for a hot rolling mill according to claim 1, wherein a wiper for preventing accumulated water is attached to the warp guide. 3. The rolling roll cooling device for a hot rolling mill according to claim 1, wherein an oblique nozzle is used as the spray nozzle.