JPS6045256B2 - Metal strip heat treatment equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to an apparatus for heat treating metal strips such as aluminum, copper, iron, etc. while moving them in a floating state, and more specifically, to reduce the buckling resistance of the strips due to the large thermal stress in the width direction that occurs in the metal strips. A metal strip heat treatment device that performs heat treatment while moving the metal strip in a state where the metal strip is curved and has a high buckling stress to prevent wrinkles from occurring parallel to the direction of movement of the metal strip. Regarding.

In a conventional device of this type, a plurality of circular hole-shaped nozzles 13f are arranged as shown in FIG. metal plate.

Its thickness is usually 3.5 mm or less, and there are various widths. ) is suspended and moved by the gas blown out from the nozzle 13f so that ridges are formed in its width direction, the part of the metal strip that is directly hit by the gas blown out from the nozzle 13f and the part that is not directly hit by the metal strip. The forces received are different, and the difference in the magnitude of the forces, especially for thin metal strips, has the disadvantage that a plurality of irregularities are formed in the width direction of the metal strip, degrading the quality of the product. Therefore, the present invention has been made to eliminate the above-mentioned drawbacks, and it is possible to apply uniformity to the entire width of the metal strip, and even a thin metal strip can be heat-treated to curve it smoothly without creating any unevenness. It is an object of the present invention to provide a metal strip heat treatment apparatus capable of performing the following steps.

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

FIG. 1 shows the main parts of a heating device 1 as an example of a heat treatment device, and 2 designates a furnace wall, which is constructed so as to be able to isolate heat between the inside and the outside, as is well known. 3,
Reference numeral 3 designates a plenum chamber, which, as is well known, is formed in a hollow shape, and a large number of nozzles are arranged on mutually opposing surfaces.

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

Reference numeral 6 indicates a burner, 7 indicates a circulation fan, and 8 indicates an air passage, which are constructed in a well-known or publicly known manner so as to be able to send high-temperature gas within the furnace wall 2 produced by combustion in the burner 6 into the plenum chambers 3, 3. has been done.

Next, 10 indicates a bending operation part formed on a part of the surface facing the metal strip 5 in the plenum chamber 3,
Support nozzle 11, details of which are shown in FIGS. 2 and 3.
and a dynamic pressure nozzle 12. In the support nozzle 11, reference numerals 13, 13, . They are arranged as follows. In other words, these circular hole-shaped nozzles 13, 13, . They are arranged in vertical columns such that they are located above 15. Furthermore, the spacing between the character lines is such that the center of one character line and both ends of the adjacent character line overlap in the moving direction of the metal strip 5 (to the right in FIGS. 1 to 3). It is set as. 16 indicates a well-known slit-shaped nozzle.

In this slit-shaped nozzle 16, the angle α shown in FIG. 2 is, for example, 456 to 60. Next, in the dynamic pressure nozzle 12, 18, 18... are nozzles,
A large number of them are arranged on the chamber wall 19. - The density of the arrangement is such that the part A facing the ridge 5'' of the metal strip 5 to be curved is arranged sparsely, and the other parts are arranged densely. The metal strip 5a is wound on a payoff reel as shown in FIG. After passing through, the metal strip 5 is passed through the heating device 1 and then into a well-known cooling device (not shown).Furthermore, the metal strip 5 coming out of the cooling device is passed through various well-known mechanisms, and then rewinded as is well-known. It is wound onto a reel as shown by reference numeral 5b. With the metal strip 5 inserted as described above, the burner 6 and fan 7 are operated.

In the steady state, the metal strip 5 is moved between the plenum chambers 3, 3 while being suspended by the heated gas blown from the nozzles of these chambers 3, and is heated by the heated gas. be done. Further, at the location where the bending operation section 10 is provided, the metal strip 5 is bent by the gas blown out from the large number of circular hole nozzles 13 and the slit nozzles 16 in the support nozzle 11, as shown in FIGS. 1 and 2. in a wavy manner (
Ridges 5″, 5... in the width direction of the metal strip 5
) and is moved in a state where the buckling resistance is increased.

In this case, the large number of circular hole-shaped nozzles 13 are arranged in the same manner as described above, so that the floating force applied to the moving metal strip 5 is uniform throughout the width of the metal strip 5.
The metal strip 5 is moved in the width direction while creating smooth ridges 5'' without fine irregularities.Also, even in the process of moving while being curved in this way, the metal strip 5 is moved by each nozzle in the support nozzle 11. is 13
, 16 and the gas blown out from the nozzle 18 in the dynamic pressure nozzle 12. The radius of curvature when the metal strip 5 is curved is selected such that the buckling resistance stress of the metal strip 5 is greater than the thermal stress generated in the metal strip 5.

Further, the bending of the metal strip 5 by the bending operation unit 10 is performed at a position where a large thermal stress is generated in the metal strip 5. For example, the bending of the metal strip 5 by the bending operation unit 10 is performed at a position where a large thermal stress is generated in the metal strip 5. This can be done in a cooling device connected to the side, or at the boundary between both devices.

As described above, in this invention, the metal strip 5
A large number of circular hole-shaped nozzles 1 are formed in a region that is elongated in the width direction of the metal strip 5 on the surface facing the metal strip 5.
3 are arranged, and the arrangement state is that they are arranged on the character lines of many ■ characters virtually drawn in a vertical column so that the center of each character is located on the center line of the elongated area. In the process of floating and moving the metal strip 5 so that a ridge 5'' is formed thereon, the entire widthwise area 1.
Even very thin metal strips can be curved and heat treated evenly across the width (smooth without bumps) and can provide a good quality product. There is a point f1.

[Brief explanation of drawings]

The drawings show an embodiment of the present application, and Fig. 1 shows the main parts of the heating device, Fig. 2 is an enlarged view of the bending operation section, Fig. 3 is a plan view of the same, and Fig. 4 shows the metal strip. FIG. 5 is a schematic perspective view showing the feeding and winding states, and FIG. 5 is a perspective view showing a conventional example. 3... Plenum chamber, 5... Metal strip, 5''... Ridge, 13...
Round hole nozzle.

Claims (1)

[Claims] 1 A state in which a large number of circular hole-shaped nozzles are arranged in an area elongated in the width direction of the metal strip on the surface facing the metal strip, and the gas ejected from the nozzles is caused to face the facing surface. In a metal strip heat treatment apparatus which is configured to float a metal strip to be moved in one direction and to form a ridge in the width direction of the metal strip in the floating state, A metal strip heat treatment apparatus characterized in that the arrangement state is on a plurality of V-shaped character lines drawn virtually and in a column so that the center of each character is located on the center line of the elongated area.