JPH051331A - Atmospheric circulating furnace - Google Patents

Abstract

PURPOSE:To reduce the cost by enabling treatment with only one set of an atmospheric circulating furnace even to a metal strip needing rapid heating and a metal foil needing slow heating. CONSTITUTION:The furnace body 1 constructed with heat insulating material, an inner case 5 arranged in the furnace body 1, a conveying table frame 7 arranged in the inner case 5 so as to support the coiling material 9 under condition of almost horizontal posture of the center shaft 10 and a circular fan 14 arranged at ceiling part of the inner case 5 so as to suck the atmospheric gas in the inner case 5, are provided. Side part injecting holes 17 facing to both end faces of the above coiling material 9 are opened at side wall parts in the inner case 5 and a bottom part injecting hole 18 facing to lower face of the coiling material 9 is opened at bottom part in the inner case 5, and also a damper 19 enabling adjustment of the atmospheric gas rate injected from the bottom part injecting hole 18, is arranged.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an atmosphere circulation furnace for heat-treating a coil-shaped object to be heat-treated by winding a strip-shaped metal member such as a metal strip or a metal foil in a coil shape by circulating an atmosphere gas. Is.

[0002]

2. Description of the Related Art In general, heat treatment of a metal member is carried out by putting a substance to be heated in a furnace, stirring the gas in the furnace by a fan, and raising the temperature in the entire furnace by a heater. However, for example, in a heat-treated object in which a metal strip is wound in a coil shape (hereinafter, referred to as a coil-shaped heat-treated object), heat hardly penetrates into the inside by this method, which causes non-uniform heating. For this reason, in the case of such a coil-shaped object to be heat-treated, nozzles are arranged toward both end faces of the object to blow hot air from the nozzles so that the heat can easily penetrate into the inside of the coil.

[0003]

However, in a case where a strip-shaped material (referred to as a metal foil) having a thickness of several microns, such as an aluminum foil, is wound, hot air is blown only on both end surfaces thereof. Since the rapid heating may cause cracking at the edges of the material and damage, the heat treatment furnace as described above is not suitable for such metal foil. For this reason, conventionally, the metal strip and the metal foil have been subjected to heat treatment such as annealing in completely different heat treatment furnaces, and there has been a problem that equipment costs are required because each dedicated furnace is required.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above, and an object of the present invention is to provide an atmosphere circulation furnace capable of heat-treating both a metal strip and a metal foil in the same furnace. Therefore, the atmosphere circulation furnace of the present invention has a furnace body constructed of a heat insulating material, an inner case provided in the furnace body, and a coil-shaped object to be heated in the inner case having a central axis thereof in a substantially horizontal posture. And a circulation fan provided on the ceiling of the inner case so as to suck the atmospheric gas in the inner case. The coil shape is provided on the side wall of the inner case. An atmosphere that blows out from the bottom outlet while opening side outlets facing both end faces of the object to be heated and opening a bottom outlet facing the lower surface of the coiled object in the bottom wall of the inner case The damper is provided so that the amount of gas can be adjusted.

[0005]

[Operation] By adjusting the blowout of the atmospheric gas from the bottom blow-out port with the damper according to the property of the coil-shaped heated object,
Not only heating and cooling of the coil-shaped object to be heated but also heating and cooling from the lower portion are appropriately added, so that the range of heat-treatable coil-shaped object to be heated is widened.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIGS. A furnace body 1 formed in a cubic shape by a heat insulating wall has a charging port 2 at one end, and a heat insulating door 3 for opening and closing the charging port 2
Is suspended on a wire 3'so that it can move up and down. An inner case 5 made of a heat-resistant steel plate is installed in the furnace body 1 so that a circulation path 4 is formed between the furnace body 1 and the inner wall surface of the furnace body 1. Reference numerals 6 and 6 are rails provided on the bottom of the inner case 5, and wheels 7 are wheels 8 so that they can travel on the rails 6 and 6.
In the carrying-in frame, the columns 11, 11 are established on the carrying-in frame 7 so that the coil-shaped object to be heated 9 can support the central axis 10 thereof substantially horizontally. Reference numeral 12 is a movable rail that is provided in the charging port 2 so as to be continuous with the rails 6 and 6. The movable rail 12 is pivotally supported outside the furnace body 1 by a support shaft 13 when the heat insulating door 3 is closed. It can be retracted upward so that it does not get in the way.

Reference numeral 14 is a circulation fan provided on the ceiling of the inner case 5 so as to suck the atmospheric gas in the inner case 5, and 15 is a motor provided on the furnace body 1 for rotating the circulation fan 14. , 16, 16 are circuit 4
It is a radiant tube burner installed in. The side wall 1 of the inner case 5 is provided with a side air outlet 1 facing both end surfaces of the coil-shaped object to be heated 9 installed in the inner case 5.
7, 17 are opened. The side outlets 17 and 17 are formed by forming a plurality of slit-shaped nozzles in a vertical stripe pattern. Further, a bottom outlet 18 is formed on the bottom wall of the inner case 5 so as to face the lower surface of the coil-shaped object to be heated 9, and the damper 1 is provided in the middle of the circulation path 4 communicating with the bottom outlet 18.
9 and 19 are provided so that the amount of atmospheric gas flowing to the bottom outlet 18 can be adjusted by adjusting the opening of the dampers 19 and 19.

Therefore, in this atmosphere circulation furnace, when heat treating a relatively thick metal strip, the damper 19,
19 is closed and the atmospheric gas heated by the radiant tube burners 16 and 16 is injected mainly from the side air outlets 17 and 17 toward both end surfaces of the coil-shaped object 9 to be heated to the inside of the coil-shaped object 9 for a short time. Rapid heating to allow heat to penetrate. When heat-treating a thin material such as a metal foil, the dampers 19 and 19 are opened to blow the heated atmospheric gas into the inner case 5 from the bottom outlet 18 as well. So that it can be heated from below as well. The side outlets 17, 17
The blowout ratio of the atmospheric gas between the bottom outlet 18 and the bottom outlet 18 is damper 1
Since it can be changed by adjusting the opening of 9 and 19,
It is appropriately set according to the property of the coil-shaped object 9 to be heat-treated.

In this embodiment, the slit-shaped outlet has been described, but the shape of the outlet need not necessarily be such a shape, and for example, a large number of circular nozzles may be provided. Further, in this embodiment, the case where the coil-shaped object to be heated 9 is heated is explained. However, a cooler is provided in place of the radiant tube burners 16 and 16 to cool the coil-shaped object to be heated 9 by blowing cool air. In this case, the technical idea of the present invention can be applied as it is.

[0010]

As described above, in the atmospheric circulation furnace of the present invention, in addition to the side air outlets opposed to both end surfaces of the coil-shaped object to be heated, the bottom air outlets opposed to the lower surface thereof are provided, and the bottom air outlets are provided. Since the amount of atmospheric gas blown out can be adjusted with a damper, heat treatment of metal strip that requires rapid heating by blowing hot air to both end surfaces and heat treatment of metal foil that requires gentle heating in addition to heating from below Such,
There is a beneficial effect that can contribute to the cost reduction because the processing target is widened and the utilization rate increases.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of an atmosphere circulation furnace of the present invention.

FIG. 2 is a sectional view taken along line XX of FIG.

FIG. 3 is a sectional view taken along line YY of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Furnace body 4 Circulation path 5 Inner case 7 Carry-in frame 9 Coil-shaped heated object 10 Center axis 14 Circulation fan 17 Side blower outlet 18 Bottom blower outlet 19 Damper

Claims (1)

Claim: What is claimed is: 1. A furnace body constructed of a heat insulating material, an inner case provided in the furnace body, and a coil-shaped object to be heated in the inner case in a substantially horizontal posture. And a circulation fan provided on the ceiling part of the inner case so as to suck the atmospheric gas in the inner case, and the coil is provided on the side wall part of the inner case. Side outlets facing both end surfaces of the heat-shaped object to be heated, and a bottom outlet facing the lower surface of the coil-shaped heat object to the bottom wall of the inner case and blowing out from the bottom outlet. An atmosphere circulation furnace characterized by comprising a damper capable of adjusting the amount of atmospheric gas.