JPH0527041U - Continuous heat treatment furnace for non-magnetic metal strip - Google Patents

Abstract

(57) [Summary] [Objective] To provide a continuous heat treatment furnace for a non-magnetic metal strip, which prevents the occurrence of contact flaws with a roll and reduces the temperature distribution difference in the width direction of the non-magnetic metal strip. With the goal. [Structure] Magnet rolls 6A and 6B each having a permanent magnet 7 on the outer peripheral surface are arranged in a zigzag pattern sandwiching a non-magnetic metal strip W in a zone downstream from the heating and soaking zone 1, and the magnet rolls are rotated. It was done like this.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a continuous heat treatment furnace for non-magnetic metal strips, and more particularly to a leveler installed in the treatment furnace.

[0002]

[Problems to be solved by conventional techniques and devices]

 Conventionally, in continuous heat treatment furnaces for metal strips such as Al or Cu strips, in order to improve the flatness in the width direction of the strips, in order to improve the flatness of the strips, for example, at a predetermined position in the furnace, for example, at the boundary between the heating / soaking zone and the cooling zone Alternatively, a leveler for curving the metal strip is arranged at a predetermined position in the cooling zone.

In this leveler, generally, a plurality of rollers are arranged in a zigzag manner with a metal strip sandwiched between them and a running metal strip is used as a roller, as described in FIG. 3 of Japanese Patent Publication No. 15615/1990. It is a configuration in which it is wound around a part of.

However, in the above structure, the metal strip is always in contact with the roller, so that there is a problem that the metal strip has roll flaws.

By the way, when a magnet roll provided with a permanent magnet on the outer peripheral surface is arranged close to the surface of the metal strip, and when this magnet roll is rotated, the magnetic flux crosses the metal strip, so It is known that eddy currents are generated and heat the metal strip. The present inventors considered the eddy current, and in the non-magnetic metal strip, the eddy current generated a magnetic field in the vertical direction of the non-magnetic metal strip. It is an object of the present invention to provide a continuous heat treatment furnace for non-magnetic metal strips, which can solve the above-mentioned problems, paying attention to the fact that it is in the direction of repulsion from a magnetic field.

[0006]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention arranges magnet rolls provided with a permanent magnet on the outer peripheral surface in a zigzag pattern with a non-magnetic metal strip in the downstream zone of heating and soaking. It is designed to rotate.

[0007]

【Example】

 Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a continuous heat treatment furnace for a non-magnetic metal strip equipped with a leveler according to the present invention, in which 1 is a heating / sequential zone, 2 is a cooling zone, and the inlet / portion 1a of the heating / sequential zone 1 and a cooling zone 2 are shown. Each of the extraction ports 2a is provided with a known seal device 3 including a seal roll or the like. Then, a leveler 5 according to the present invention is installed in a communication portion 4 between the heating / uniform temperature zone 1 and the cooling zone 2.

The leveler 5 includes two magnet rolls 6A and 6B described below, which are arranged in a zigzag manner as in the conventional case. As is apparent from FIG. 2, the magnet rolls 6A and 6B are permanent magnets 7 provided on the outer periphery of the roll bodies 6a and 6b in the longitudinal direction at predetermined intervals with a non-magnetic spacer 7a interposed therebetween. 6A, the S pole of the permanent magnet 7 is arranged outward, and in the magnet roll 6B, the N pole is arranged outward.

Because of the above-described structure, when the non-magnetic metal strip W such as Al or Cu is run in the furnace to be heat-treated, if the magnet rolls 6A and 6B are rotated in the arrow direction at about 500 rpm or more, Eddy current is generated in the magnetic metal strip, that is, a magnetic field in a direction that repels the magnetic field of the magnet in the magnet roll is generated in the non-magnetic metal strip portion, and the metal strip W is separated from the magnet rolls 6A and 6B (floating). ) And then run. That is, the metal strip W does not come into contact with the magnet rolls 6A and 6B, travels in a curving manner and is not damaged.

In the above-mentioned embodiment, the permanent magnet 7 of the magnet roll 6 A is arranged so that the S pole is outward, and the permanent magnet 7 of the magnet roll 6 B is arranged so that the N pole is outward. However, in short, it suffices that the opposing magnetic poles are regularly arranged so as to have opposite polarities.

Further, the longitudinal permanent magnets 7 provided on the magnet rolls 6A and 6B are not a single permanent magnet 7 but a plurality of permanent magnets having alternating N and S poles, as shown in FIG. It is also possible to arrange so as to form a complex magnetic flux, and it is possible to adjust the temperature in the width direction of the metal strip W.

[0012]

[Effect of the device]

 As is clear from the above description, the present invention has a permanent magnet on the outer peripheral surface in the downstream zone from the heating / equalizing zone, for example, at the boundary between the heating / equalizing zone and the cooling zone or at a predetermined position in the cooling zone. Since the non-magnetic metal strips are arranged in a zigzag manner with the provided magnetic rolls, and the non-magnetic metal strips are curvedly run between the rolls, that is, because the rolls forming the conventional leveler are magnet rolls, The non-magnetic metal strip can be curvedly run without contact, and roll defects can be prevented.

Further, since the non-magnetic metal strip is magnetically heated, it has the effect of reducing the temperature distribution difference in the width direction of the non-magnetic metal strip.

If the seal roll of the seal device 3 is a magnet roll as described above, the non-magnetic metal strip W is separated from the seal roll, so that the gap between the seal rolls can be narrower than in the conventional case. It is also possible to reduce the amount of atmospheric gas used.

[Brief description of drawings]

FIG. 1 is a schematic view of a continuous heat treatment furnace for a non-magnetic metal strip equipped with a leveler according to the present invention.

FIG. 2 is a perspective view of the magnet roll shown in FIG.

FIG. 3 is a perspective view showing another embodiment of the magnet roll.

[Explanation of symbols]

1 ... Heating / uniform temperature, 2 ... cooling zone, 5 ... leveler, 6A,
6B ... Magnet roll, 7 ... Permanent magnet, W ... Non-magnetic metal strip.

Claims (1)

[Scope of utility model registration request] 1. A magnet roll having a permanent magnet on its outer peripheral surface is arranged in a zigzag pattern sandwiching a non-magnetic metal strip in a zone downstream from the heating and soaking zone, and the magnet roll is rotated. Continuous heat treatment furnace for non-magnetic metal strip.