JPS6043893B2 - Metal strip heat treatment equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a metal strip such as aluminum, copper, iron or the like (the metal strip refers to a thin and long strip-shaped metal plate continuously rolled in a rolling mill).

Its thickness is usually 3.5 mm or less, and there are various widths. The present invention relates to an apparatus for performing heat treatment such as annealing on metal strips while moving them in a floating state, and particularly relates to a plenum chamber type metal strip heat treatment apparatus. Metal strip heat treatment equipment using a plenum chamber is easy to manufacture and can be provided at low cost. Also, since gas is blown out from the entire area of the wide metal strip facing surface, the metal strip can be efficiently heated or cooled by the gas. However, if the width dimension becomes large, the gas flow between the metal strip and the opposing surface of the metal strip becomes uneven, causing temperature unevenness in the metal strip. Alternatively, the floating state may become unstable, causing the metal strip to flap.

Therefore, the present invention is designed to eliminate these drawbacks.
Even if the metal strip is wide, the gas flow between the metal strip and the opposing surface of the metal strip can be made uniform, so that the temperature of the metal strip can be made uniform and the floating state can be stabilized. The present invention aims to provide a metal strip heat treatment apparatus.

The drawings showing the embodiments of the present application will be described below.

FIG. 1 shows the main parts of a heating apparatus 1 as an example of a heat treatment apparatus, and 2 indicates a furnace wall, which is configured to provide heat isolation between the inside and the outside, as is well known. 3,3
indicates a plenum chamber, which, as is well known, is formed in a hollow shape.

Reference numeral 4 indicates a metal strip transfer space formed between both chambers 3, 3, and 5 indicates a metal strip.

Reference numeral 6 denotes a circulation fan, and 7 a blowing passage, which are configured in a well-known or publicly known manner so as to be able to send high-temperature gas within the furnace wall 2 into the plenum channels 3, 3.

Next, FIG. 2, which shows in detail the metal strip facing surface 3a of the plenum chamber 3, will be described. 1
0 indicates a nozzle surface, and there are many nozzles 11 for blowing out gas.
are opened in a well-known or well-known arrangement.

Reference numeral 12 indicates return passages, and a plurality of return passages are provided horizontally at appropriate intervals in the moving direction 13 of the metal strip 5.

Further, as clearly shown in FIG. 4, the return passage 12 has a shallow center portion 12a and a deep side portion 12b. In the structure described above, the metal strip 5a, which is wound on a payoff reel as shown in FIG. 3 as is well known, is let out as shown by arrow 20.

The rolled-out metal strip 5 passes through various well-known mechanisms, and then is inserted into the heating device 1 and then into a well-known cooling device (not shown). It will be done. Further, the metal strip 5 emerging from the cooling device is passed through various well-known mechanisms and then wound onto a rewind reel, as indicated by the reference numeral 5b, in a well-known manner. The metal strip 5 is inserted as described above.
In this state, the fan 6 is operated.

In the steady state, the metal strip 5 is moved between the plenum chambers 3, 3 in a suspended state by the heated gases blown from the nozzles 11 of these chambers 3, and is suspended by the heated gases. Heat treated. In this case, since there is a groove-shaped return passage 12 between the metal strip facing surface 3a of the plenum champion 3 and the metal strip 5, the gas that is blown out from the nozzle 11 and collides with the metal strip 5 flows between the metal strip 5 and the nozzle. As shown by the dashed line arrow, the flow flows at a uniform speed across the entire surface between the nozzle surface 10 and the nozzle surface 1.
The liquid flows out to the side of the plenum chamber 3 through the side end 10a of 0 or the return passage 12. Incidentally, the pitch interval of the return passage 12 is determined according to the width dimension of the plenum chamber 3.

(For example, if the width is 6007077! or more, the pitch will be approximately the same as the width.) The width and depth of the return passage 12 are determined depending on the amount of gas blown out from the nozzle 11 or the pitch interval of the return passage 12, and the air volume When there are many pitches or when the pitch interval is large, it is made wider or deeper.

Furthermore, the depths of the central portion 12a and both side portions 12b of the return passage 12 are set so that the velocity of the gas blown out from the nozzle 11 and colliding with the strip 5 is uniform over the entire surface.

That is, the closer the end of the return passage 12 is, the more gas is collected in sequence, so the passage is made deeper. On the other hand, the central portion 12a is formed shallowly so that the gas flow is extremely small compared to the side portions 12b. In order to make the central portion 12a shallow, it may be made at the same height as the nozzle surface 10 as shown in the figure. Depending on the type of strip, etc., if the uniformity of the gas flow is not so strictly required, the return passage may be formed to have a uniform depth both in the center and on both sides. good.

Further, although the above description has been made by taking a heating device as an example, it is preferable that the plenum chamber of a cooling device has a similar structure.

As described above, in this invention, the plenum chamber 3
A plurality of groove-shaped return passages 12 are provided horizontally at appropriate intervals in the moving direction 13 of the metal strip 5 on the surface 3a facing the metal strip 5 in the chamber 3, so that the surface 3a facing the metal strip 5 in the chamber It has the advantage that the gas flow between the strip 5 and the strip 5 can be made uniform over the entire surface.

This has the effect that the temperature of the metal strip 5 can be made uniform over the entire surface, allowing good heat treatment to be performed, and also has the advantage that the metal strip 5 can be stably held floating.

Furthermore, if the central portion 12a of the groove-shaped return passage 12 is configured to be shallow and the side portions 12b to be deep, the gas distribution distribution will be made uniform across the entire saw layer, which will have a great effect on achieving the best quality heat treatment. .

[BRIEF DESCRIPTION OF THE DRAWINGS] The drawings show an embodiment of the present application, and FIG. 1 is a diagram showing the main parts of the heating device, FIG. 2 is a perspective view of the main parts of the plenum chamber, and FIG. 3 is a drawing showing the feeding of the strip. A schematic perspective view showing a winding state, and FIG. 4 is a sectional view taken along the line ■-■. 3... Plenum chamber, 3a... Metal strip opposing surface, 5... Metal strip,
12...Return passage.

Claims (1)

[Scope of Claims] 1. A plenum chamber in which a number of nozzles for ejecting gas are arranged on a surface facing the metal strip, and a metal strip transfer space substantially parallel to the surface facing the metal strip in the plenum chamber. and in the transfer space, the metal strip is suspended by gas jetted toward the metal strip from the plurality of nozzles, and the metal strip is moved in one direction substantially parallel to the opposing surface of the plenum chamber. In a metal strip heat treatment apparatus configured to move,
A plurality of groove-shaped return passages are provided horizontally on the surface of the plenum chamber facing the metal strip at appropriate intervals in the direction of movement of the metal strip and each oriented in a direction perpendicular to the direction of movement of the metal strip. Metal strip heat treatment equipment featuring: 2. A plenum chamber in which a number of nozzles for ejecting gas are arranged on a surface facing the metal strip, and a metal strip transfer space substantially parallel to the surface facing the metal strip in the plenum chamber, and in the transfer space. is configured to cause the metal strip to be suspended by gas jetted toward the metal strip from the plurality of nozzles, and to move the metal strip in one direction substantially parallel to the opposing surface of the plenum chamber. In a certain metal strip heat treatment equipment,
A plurality of groove-shaped return passages are provided horizontally on the surface of the plenum chamber facing the metal strip at appropriate intervals in the direction of movement of the metal strip and each oriented in a direction perpendicular to the direction of movement of the metal strip; Moreover, the metal strip heat treatment apparatus is characterized in that these groove-shaped return passages are formed so that the central part is shallow and the both sides are deep.