JPS61243127A - Cooling method for metallic strip - Google Patents

Abstract

PURPOSE:To obtain the strip temp. distribution and shape uniform in the transverse direction of a strip by pressing the rear side of the metallic strip which contacts with cooling rolls by small-diameter press rolls at proper times in a cooling zone. CONSTITUTION:The cooling rolls No.1-No.5 are provided in the cooling zone. The strip S is threaded therebetween in such a manner that the surfaces thereof contact alternately with the rolls. The strip is thereby cooled to a desired temp. The small-diameter press rolls 1A, 1B are disposed on the rear side of the strip S in the position of the No.1 cooling roll. The rolls 1A, 1B are pressed to the roll No.1 side to bring the entire part in the transverse direction of the strip S into tight contact with the roll No.1. The rolls 1A, 1B are supported pivotally by the top end of holding rolls 2 in such a manner that the axes thereof are paralleled with the axis of the roll No.1. These rolls are formed of metallic rolls. The strip S is thereby brought into uniform contact with the roll No.1.

Description

Detailed Description of the Invention (Field of Industrial Application) 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 continuous annealing equipment. It is related to.

(Problem to be solved by the invention) For example, when continuously annealing a metal strip such as a copper strip, a group of rotary cooling bodies (chilling rolls) are arranged in the cooling zone of the continuous annealing equipment to cool the material by flowing a refrigerant inside, and these cooling rolls are Method of cooling by contacting the strip with the group (
For example, Japanese Patent Laid-Open No. 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 of the strip tends to be uneven due to various factors before it is sent to the cooling zone.
When such a strip comes into contact with a cooling roll, there are areas with good contact and areas with poor contact in the width direction, and areas with good contact shrink in the longitudinal direction, resulting in increased tension and more contact with the roll. However, areas with poor contact remain at a high temperature and are not cooled. This tendency is amplified as you move toward the cooling rolls at the rear.

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. The strip is cooled by pressing the back side of the strip with at least one small-diameter presser roll at appropriate times.

(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 strip into close contact with the cooling rolls, and the strips are uniformly cooled.

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

Figure 1 shows cooling rolls No. 1 to No. There are 5 pieces of 5 (
The rolls on both sides are non-cooled rolls), and the strip S is passed through these rolls so that their surfaces alternately contact each other, and is cooled to a desired temperature.

In the present invention, two small diameter presser rolls IA are placed on the back side of the strip S at the position of the No. 1 cooling roll.
IB is arranged and presser rolls IA and IB are pushed toward the cooling roll so that the entire width direction of the strip S is in close contact with the cooling roll.

FIG. 2 shows a specific example of the presser roll L, which 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 passes through the furnace shell 3 of the cooling zone and extends to the outside.
It is connected to a screw jack 5 via a slide support part 4. Further, the holding rod 2 has a water-cooled structure, and a bellows 6 is provided at the boundary with the furnace shell 3. 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 further exacerbated if left as it is, but once contact is initiated, the contact state will be maintained from then on. Therefore, the strip S may be temporarily pressed against the cooling roll C using the presser roll L, and if a good contact state is confirmed, the presser roll may be retracted at that point.

In addition, the installation mode of the presser roll l is shown in Fig. 3 (a).
As shown in (b), a plurality of cooling rolls C may be arranged in the lengthwise direction of the body, and each presser roll may be configured to be independently displaceable.
As shown in the figure, one presser roll 1 can be moved in directions perpendicular and parallel to the length of the cooling roll body, or
As shown in the figure, the two presser rolls may be moved in the same manner as in the figure (0) to provide good responsiveness.

The installation position of the presser roll is the first one, as shown in Figure 1.
The No. 2 cooling roll is preferable because if the temperature in the width direction of the strip entering the cooling roll is uneven or the original shape is poor, uneven contact will occur with the N001 cooling roll. Of course, it is also possible to install it for No. 20 meters or more.

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

(Example) Fig. 4 (a) ((2) is 0.7 layer thick, width 1007
This is the result of measuring the temperature distribution in the width direction of a steel strip in the width direction of a steel strip passed through five cooling rolls as shown in FIG. 1 at a speed of 148 mpm. (a) shows a state where the plate temperature distribution is uneven, and (0) shows a case where the presser roll is brought into contact with the first cooling roll to solve the situation (a). It can be seen that as a result of contacting the presser roll, the plate temperature distribution became uniform.

[Brief explanation of the drawing]

Figure 1 is a schematic diagram showing a cooling facility for carrying out the method of the present invention, Figure 2 (A) (0) is a side view and front view showing a specific example of a small diameter presser roll, and Figure 3 (A) ( 0)? X> is an explanatory diagram showing various installation modes of the presser roll, FIG. l...
Presser roll, 2... Holding rod, 3... Furnace shell, 4...
Slide support part, 5...Screw jack, 6...
・Bellows.

Claims (2)

[Claims] (1) In a metal strip cooling method in which the metal strip is cooled by contacting a plurality of cooling rolls installed in the cooling zone of continuous annealing equipment, the back side of the metal strip that is in contact with the cooling rolls is
A method for cooling a metal strip, characterized in that the strip is cooled by pressing the strip at appropriate times with at least one small-diameter presser roll. (2) The method according to claim 1, wherein a plurality of presser rolls are arranged in the lengthwise direction of the roll torso and are movable in a direction perpendicular to the roll torso.