JPS6360815B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a method for cooling a metal strip such as a steel strip, particularly a method in which the strip is cooled by direct contact with a cooling roll disposed in a cooling zone of a continuous annealing facility. It is related to.

(Problem to be solved by the invention) For example, when continuously annealing a metal strip such as a steel strip, a group of rotary cooling bodies (chilling rolls) that cool the material by flowing a refrigerant inside is arranged in the cooling zone of the continuous annealing equipment, and these cooling rolls are A method of cooling by bringing a strip into contact with the group (for example, JP-A-52
-80208) is known.

In the cooling zone of continuous annealing equipment, the strip may not contact the cooling roll uniformly in the width direction. This is because the tension distribution in the width direction tends to be uneven in the strip before it is fed into the cooling zone due to various factors. There are good areas and bad areas, and areas that are in good contact shrink in the longitudinal direction, increasing the tension, making more and more contact with the roll and being cooled, but areas with poor contact remain high temperature and are not cooled. . Such a tendency is amplified toward the cooling rolls in the rear region.

The present invention aims to eliminate the above-mentioned uneven contact of the strip with the cooling roll and to obtain a uniform strip temperature distribution and shape in the width direction.

(Structure of the Invention) The cooling method of the present invention is a method for cooling a metal strip by bringing the metal strip into contact with a plurality of cooling rolls installed in a cooling zone of continuous annealing equipment. It is characterized in that the back side of the metal strip is pressed at appropriate times with at least one small-diameter presser roll to cool the strip.

(Function) The strip fed into the cooling zone is cooled by contacting the cooling roll, but since a presser roll is provided on the back side of the strip, if the strip temperature distribution becomes uneven, the presser roll The rolls force the strips into close contact with the cooling rolls for uniform cooling.

Embodiments of the present invention will be described below based on the drawings.

In Figure 1, five cooling rolls No. 1 to No. 5 are provided (the rolls on both sides are non-cooling rolls), and strips S are passed through these so that their surfaces alternately contact each other, and the desired An example of cooling to temperature is shown. In the present invention, two small-diameter presser rolls 1 are placed on the back side of the strip S at the position of the No. 1 cooling roll.
A and 1B are arranged, and the presser rolls 1A and 1B are pushed toward the cooling roll so that the entire widthwise direction of the strip S is in close contact with the cooling roll.

FIG. 2 shows a specific example of the presser roll 1. The presser roll 1 is comprised of a metal roll supported at the tip of a holding rod 2 so that its axis is parallel to the axis of the cooling roll C. . The holding rod 2 extends to the outside through the furnace shell 3 of the cooling zone, and is attached to the slide support part 4.
It is connected to Screw Jack 5 via. Moreover, the holding rod 2 has a water-cooled structure, and is connected to the furnace shell 3.
A bellows 6 is provided at the border. Therefore, the presser roll 1 can press the strip S against the cooling roll C as required by the screw jack 5.

In roll cooling, if the strip is not in sufficient contact with the cooling roll, this condition will be exacerbated if left as it is, but once contact is initiated, the contact is maintained from then on. Therefore, the strip S may be temporarily pressed against the cooling roll C using the presser roll 1, and if a good contact condition is confirmed, the presser roll may be retracted at that point.

In addition, as the installation mode of the presser roll 1, the third
As shown in Figure A, a plurality of presser rolls can be arranged in the lengthwise direction of the cooling roll C and each presser roll can be independently displaced, or as shown in Figure B, one presser roll 1 can be arranged perpendicular to the length of the cooling roll. Alternatively, as shown in Figure C, the two presser rolls may be moved in the same manner as in Figure B, with good responsiveness.

As shown in FIG. 1, the presser roll is preferably installed at the first cooling roll. This is because if the temperature in the width direction of the strip entering the cooling roll is non-uniform or if the shape of the original sheet is defective, non-uniform contact will occur with the No. 1 cooling roll. Of course, installation for No. 2 rolls and subsequent rolls is also possible.

(Effects of the Invention) According to the method of the present invention, it is possible to bring the metal strip into uniform contact with the cooling roll in the cooling zone of continuous annealing equipment, so it is possible to obtain a uniform sheet temperature distribution and shape in the width direction. It is possible.

(Example) Figures 4A and 4B show the results of measuring the temperature distribution in the width direction of a steel strip having a thickness of 0.7 mm and a width of 1007 mm, passed through five cooling rolls as shown in Figure 1 at a speed of 148 mpm. A shows a state in which the plate temperature distribution has become uneven, and B shows a case in which cooling was performed by bringing a presser roll into contact with the first cooling roll in order to eliminate the state in A. As shown in the figure, it can be seen that as a result of contacting the presser roll, the plate temperature distribution became uniform.

[Brief explanation of drawings]

Figure 1 is a schematic diagram showing the cooling equipment for carrying out the method of the present invention, Figure 2 A and B are side and front views showing a specific example of a small diameter presser roll, and Figure 3 A, B and C are presser feet. FIGS. 4A and 4B are explanatory diagrams showing various installation modes of rolls, and are diagrams for explaining embodiments of the present invention. C... Cooling roll, S... Strip, 1... Presser roll, 2... Holding rod, 3... Furnace shell, 4... Slide support portion, 5... Screw jack, 6... Bellows.

Claims (1)

[Claims] 1. A method for cooling a metal strip by bringing the metal strip into contact with a plurality of cooling rolls installed in a cooling zone of continuous annealing equipment, wherein the metal strip is in contact with a first cooling roll. A plurality of small-diameter presser rolls are arranged in the strip width direction at least at one location on the arc of the cooling roll on the back side of the strip, and the presser rolls are moved in a direction perpendicular to the length of the roll body or both in parallel and perpendicular directions. A method for cooling a metal strip, characterized in that the strip is cooled by pressing the strip in a timely manner.