JPS5877534A - Cooler for steel strip in continuous annealing installation - Google Patents

Abstract

PURPOSE:To provide a titled device which makes the temp. distributions of a metallic strip uniform and prevents the generation of shape defects by pressing the steel strip which is passed through a continuous annealing installation to rotary cooling bodies by using pressing means to bring the same into contact simultaneously with said bodies in its breadthwise direction thereby cooling the strip. CONSTITUTION:In a continuous annealing installation for metallic strips having a cooling zone provided with rotary cooling body groups 71, a press roll 72 is provided movably in an arrow direction on the inlet side where a metallic strip S passing through said installation starts contacting with a rotary cooling body 71 first. In the normal operation, the roll 72 is pressed to the body 71 to bring the strip S in uniform contact with the body 71 in the breathwise direction at the point A no matter which of the courses (a), (b), (c) the strip takes. The pressing direction of the roll 72 is preferably about theta=0-5 deg. with respect to horizon. It is also effective to provide the press rolls on both of the inlet side 72a and/or outlet side 72b for the rotary cooling body groups.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cooling device for a metal strip in a continuous annealing facility.

When continuously annealing a metal strip, such as a copper strip, a rotating cooling body group in which a refrigerant flows through the inner peripheral surface of the body is installed in the cooling zone interval of the continuous annealing equipment, and the plate is threaded through this rotating cooling body group. The conventional water cooling method, the jet cooling method, and the mist cooling method are the methods of cooling the copper strip by bringing it into contact with each other, from the viewpoints of ease of controlling the cooling rate and cooling end point temperature, prevention of oxidation of the surface of the copper strip, and cooling efficiency. Such rotary cooling bodies are being replaced by continuous annealing equipment, for example, in which heating zone 1, soaking zone 2, slow cooling zone 3, rapid cooling zone 4 and part of overaging zone 5 are shown in FIG. , it is provided in the rapid cooling zone 4 (indicated by reference numeral 7). 6 is a gas jet cooling device. In the cooling zone of this continuous annealing equipment, for example, 6
The metal strip having a temperature of 80° C. or more is first slowly cooled by the sujet cooling bag #6, and then by the rotary cooling body group 7 provided in the rapid cooling zone 4. The contact time with the cooling body group 7 is several seconds (approximately 1 to 4 seconds), so if the contact state of the metal strip to the rotating cooling zone changes even slightly, the temperature distribution of the metal strip will become uneven. If the contact with the rotary bath cooling body is continued with this defective shape, the contact condition will become even worse and the defective shape will be amplified.

This state will be explained in more detail. As shown in Figure 1,
The shape of the metal strip that enters to come into contact with the first rotary cooling body of the rotary cooling body group 7 is not necessarily flat, and it approaches while descending from the -F section of the furnace with a high furnace height. Normally, the tension is limited to about 1.0 kg/am2 for operational reasons. For this reason, the cooling start point (contact point) in the rotary cooling body changes due to some twisting of the metal band.

Figure 2 is a diagram showing the state of the metal (1?) entering the rotary cooling body, with the metal strip (1?) being stretched out from the actual state for easier understanding. 7 Rotary cooling A・1ζ
Ideally, the surface of R should contact point A at the same time in the width direction to start cooling, but in the actual work,
For the reason explained earlier, (1)
It is impossible to avoid contact at a point or contact at a point 0 according to path 1 in (C). As a result, the cooling start point varies, the contact position differs in the IJ direction, a temperature difference occurs in the width direction, and the shape collapses.

An object of the present invention is to provide a cooling device for a metal strip in a continuous annealing facility which can eliminate the above-mentioned drawbacks.

The gist of the present invention is that in continuous annealing equipment for metal strips having a cooling zone tA that is equipped with a group of rotary cooling bodies, the entrance side where the metal strip being threaded starts contacting the rotary cooling body and/or the rotation d A cooling device for a metal strip in a continuous annealing facility is provided with a pressing means for pressing the metal strip against the surface of a rotary cooling body on the exit side from which the metal strip is finally removed.

The present invention will be explained based on all the drawings.

FIG. 3 shows an example of an embodiment of the present invention. In the figure, 71 is an inlet rotary cooling body of a rotary cooling body group arranged in the rapid cooling zone, and 72 is a presser roll configured to be movable in the direction of the arrow. During steady operation, the presser roll 72 is pressed against the rotary cooling body 71, and the copper strip S is being threaded (a), (b).

No matter which route (c) is taken, it reaches point A and is brought into uniform contact with the rotary cooling body 71 in the width direction. This presser roll 7
The direction in which the presser roll 72 is pressed is preferably about θ-〇 (horizontal) to about 5°.

As the pressing means, in addition to the above-mentioned presser roll, it is also possible to employ, for example, a Snoet pressing means.

FIG. 4 shows an embodiment in which presser rolls are arranged on the inlet and outlet sides of the rotary cooling body group. In the figure, 72& is an input presser roll, and 72b is an output presser roll. Since the starting point and/or ending point is stabilized, the occurrence of shape defects due to temperature differences in the middle direction of the metal strip is reduced, and
The effect of reducing line torasol due to the walking phenomenon of the metal band can be achieved.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing a part of a continuous annealing facility having a rapid cooling zone equipped with a group of rotary cooling bodies, and m 2 +'21 shows the manner in which the metal band enters the first rotary cooling body. The explanatory drawings, FIGS. 3 and 4 are diagrams showing embodiments of the present invention. (5) $Z diagram 3rd T2J Noah/4th 21 189-

Claims (1)

[Claims] In a continuous annealing facility for metal strips having a cooling zone with a group of rotary cooling bodies, the metal strip being threaded starts to contact the rotary cooling body at the entry side and/or finally leaves the rotary cooling body. A cooling device for a metal strip in a continuous annealing facility that is equipped with a presser means for pressing the metal strip against the surface of a rotating cooling body on the exit side.