JPS5877535A - Cooler for metallic strip in continuous annealing installation - Google Patents

Abstract

PURPOSE:To provide a titlted device which makes the temp. distributions of a metallic strip uniform and prevents the generation of shape defects by providing rotary non-cooling bodies in proximity to rotary cooling bodies, and bringing a metallic strip passing through a continuous annealing installation into contact with the rotary cooling bodies simultaneously in its breadthwise direction thereby cooling the strip. CONSTITUTION:A rotary non-cooling body 72 is provided in proximity with the rotary cooling body 71 on the inlet side of a rotary cooling body group 7 of a continuous annealing installation for a metallic strip S. No matter which of the cources (a), (b), (c) the strip S takes, the contact point of the strip S with the body 71, that is, the cooling start point is constant, and the nonuniform contact in the breadthwise direction is avoided. It is also possible to provide the rotary non-cooling bodies 72a, 72b on the inlet side and/or outlet side of the group 7. Thus the cooling start point and/or end point of the strip S are stabilized, the generation of shape defects owing to the temp. differences in the breadthwise direction of the strip S is prevented and the line troubles owing to walk phenomena of the metallic strip are reduced.

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, for example, a steel strip, a rotary cooling body group 'ft is provided in the cooling zone of the continuous annealing equipment in which a refrigerant flows through the inner peripheral surface of the body, and the plate is passed through this rotary cooling zone group. The method of cooling the steel strip by bringing it into contact with each other is superior to the conventional water cooling method, jet cooling method, and mist cooling method from the viewpoints of ease of controlling the cooling end point temperature, prevention of oxidation of the copper strip surface, cooling efficiency, etc. It is changing.

In continuous annealing vli#, the rotary cooling body group includes a heating zone 1, a soaking zone 2, and a slow cooling zone 3, as shown in FIG.
It is provided in the rapid cooling zone 4 following the

In the figure, 5 is an overaging zone, 6 is a gas jet cooling device, and 7 is a rotary cooling body group-C. [5 il metal strip soaked at a temperature of 680° C. or higher in the equipment shown in 1]
-tt is slowly cooled by the jet cooling device η6,
Then, it is rapidly cooled by the rotary cooling body group 7 placed in the rapid cooling zone 4 (30-b).

During this rapid cooling, the contact period of the metal band 8 with the rotary cooling body group 7 is several seconds (1 to 4 seconds 'I'1!IAC),
Therefore, if μ changes even slightly in the contact state of the metal strip to the rotating cooling zone, the temperature/degree distribution of the metal strip will become uneven, resulting in a shape defect, and the metal strip will continue to be in contact with the 11 rotary cooling body with this defective shape. If this happens, the contact condition will become even worse, resulting in a binding that amplifies the shape defect.

In this state? This will be explained in more detail. As shown in Fig. 1, the shape of the metal strip S that enters the 1-1i'1st rotary cooling body of the rotary cooling body group 7 is not necessarily flat, and the file length from the top of the furnace is small. It is long and has a tension of 1.0k for operational purposes.
Since it is limited to approximately g/ma2, the metal band may be twisted or fluttering to some extent. Therefore, the cooling start point (contact point) in the rotary cooling body varies in the length and width directions.

Figure 2 is a diagram showing the state of the entrance of the Golden Man S into the rotating body, with exaggerations rather than omissions, to aid understanding. Ideally, the metal strip S enters (a) and contacts the surface of the rotary cooling body R at point A in the width direction at the same time to start cooling, but in actual operation, For the reason explained in (b), it passes through ・P and contacts at point B or (C
) - 971 ways of contact at the 0 point cannot be avoided. As a result, the cooling start point varies, the contact position in the force direction differs, a temperature difference occurs in the middle direction, and the shape collapses. If contact with the rotating cooling body continues in this distorted shape, [1] the contact in the force direction becomes even worse, amplifying the shape defect.

The above phenomenon also occurs when the final rotary cooling body is removed.

The object of the present invention is to provide a cooling system for all four zones of gold in continuous annealing equipment, which can eliminate all the problems associated with +'+il. and/or by arranging all the rotary throat cooling bodies close to each other on the outlet side.

That is, the gist of the present invention is to provide a rotary non-cooled body on the inlet side and/or outlet side of the rotary coolant group in a series of metal strips IA', H'A Mi equipment having a cooling zone equipped with a rotary coolant group. The height of the metal band in the continuous annealing facility btt1, which is arranged close to each other and where k and are set to lII'l, is located in the former part of l11ε.

The present invention will be explained with reference to all the drawings.

FIG. 3 shows an example of an embodiment of the present invention. In the figure, 71 is the -iKth rotary cooling body of the rotary cooling body group, 72
is a rotating non-cooled body in which the rotating cooling body 71 is arranged in an rL-C arrangement 1'1. This rotary cooling body 72 (I-2 relative to the rotary cooling body 71 by installing tJ) ”: contact point of li zone S (cooling start point) A &;
Uneven contact in the 11J direction is avoided.

FIG. 4 shows an example in which a rotating cooling body 71f70 enters t11] and rotating non-cooling bodies 72a and 72b are arranged on the outlet side.

According to the present invention, the contact of the metal strip to the rotary cooling body becomes uniform in the width direction, and the starting point and/or end point of cooling the metal by the rotary cooling body is made more feminine, so that the temperature IW in the width direction of the metal strip becomes uniform. The occurrence of shape defects due to differences is reduced, and
This has the effect of reducing line troubles due to the walking phenomenon of the metal band.

[Brief explanation of drawings]

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 Fig. 2 is a mode of entry of the metal band into the rotary cooling body in the first inspection in a conventional example. FIGS. 3 and 4 are explanatory diagrams showing embodiments of the present invention. (5) Figure 1 Figure 2

Claims (1)

[Claims] Continuous annealing equipment for metal strips having a cooling zone 1 equipped with a rotary cooling body group, characterized in that a rotating non-cooling body is disposed close to the inlet side and/or outlet side of the rotary cooling body group. Metal strip cooling device.