WO2003091462A1

WO2003091462A1 - Vertical muffle type heat treating furnace

Info

Publication number: WO2003091462A1
Application number: PCT/JP2003/001996
Authority: WO
Inventors: Masato Nagata
Original assignee: Chugai Ro Co., Ltd.
Priority date: 2002-04-23
Filing date: 2003-02-24
Publication date: 2003-11-06
Also published as: EP1498502A1; JP2003313613A; CN1643169A; EP1498502A4; KR20040101241A

Abstract

A vertical muffle type heat treating furnace, comprising a vertically disposed muffle allowing metal strips to be led therein from an upper side to a lower side, a heating zone for heating, from the outside of the muffle, the metal strips passing through the inside of the muffle, a cooling zone for cooling the metal strips on the downstream side of the muffle in the moving direction of the metal strips, and an extendable muffle extension adjusting zone for fixing the upper end side of the muffle and bringing an area between the lower end part of the muffle and the cooling zone in sealed state.

Description

Specification

Vertical pine full heat treatment furnace Technical field

The present invention relates to a vertical Matsufuru type heat treatment furnace, and more particularly to a vertical Matsufuru in which a metal strip is guided from top to bottom inside, and the above-mentioned Matsufuru which passes through the inside of Matsufuru from the outside of this Matsufuru. In a vertical Matsufuru heat treatment furnace having a heating zone for heating a metal strip and a cooling zone for cooling the heated metal strip at a position downstream of the Matsufuru in the moving direction of the metal strip, It is characterized by the fact that the elongation of pine pine can be easily absorbed. Background art

Conventionally, a vertical Matsufuru type heat treatment furnace has been used for annealing metal strips such as stainless steel.

In such a vertical Matsufuru type heat treatment furnace, the top of the Matsufuru is fixed, the Matsufuru is arranged vertically, and a heating zone for heating the muffle from outside the Matsufuru is provided. Then, the metal strip is guided upward from the bottom to heat the metal strip passing through the inside of the Matsufuru in the heating zone. Then, the metal strip thus heated is cooled in a cooling zone provided on the upper side of Matsufuru, so that the metal strip is annealed. The above cooling zone may include a slow cooling zone for gradually cooling the metal strip.

Here, in such a vertical Matsufuru type heat treatment furnace, since the upper end of the Matsufuru is fixed as described above, the Matsufuru is heated up to about 900 to 120 ° C in the above heating zone. When heated, the Matsufuru expands due to heat and extends downward due to its own weight. Due to the heating, the temperature of the upper part of the pine ful increased, and the pine ful had a large elongation, resulting in plastic deformation, and the pine ful gradually became longer.

In recent years, as shown in Japanese Patent Application Laid-Open Publication No. 2000-508712, the lower end of the matsufur is fixed and the matsufur is arranged in the vertical direction. A heating zone for heating the Matsufuru is provided, a metal strip is guided from top to bottom in the Matsufuru, and a metal strip passing through the inside of the Matsufuru is heated in the heating zone. It has been proposed that the metal strip is annealed by cooling in a cooling zone provided on the lower side.

However, when the lower end of the pineapple is fixed as described above, if the pineapple is heated to about 900 to 1200 ° C in the heating zone as described above, the pineapple does not extend well to the upper side. In addition, there was a problem that pine full buckling occurred.

For this reason, in the publication disclosed in the above-mentioned publication, a sabot means is provided for pulling the upper end of the Matsufuru upward, and the Matsufuru is extended upward by the sabot means to prevent the Matsufuru from buckling. I am trying to do it.

However, when the sabot means for pulling the upper end of the Matsufuru upward is provided, the structure becomes complicated, which increases the cost, and the upper end of the Matsufuru is raised upward by the above-mentioned support means. It is difficult to properly adjust the pulling force.If the tensile force of the support means is increased, the pineapple will excessively stretch upward and plastically deform, while if the tensile force is weakened, the pineapple will buckle. There was a problem. Disclosure of the invention

An object of the present invention is to solve the above-described various problems in a vertical Matsufuru heat treatment furnace used for annealing a metal strip such as stainless steel.

In the present invention, the vertical direction in which the metal strip is guided up and down inside Pine hull, a heating zone for heating a metal strip passing from the outside of the matsu full to the inside of the matsu full, and the above-mentioned heated metal strip on the downstream side in the direction of movement of the metal strip from the matsu full. The purpose of the present invention is to make it possible to easily absorb the elongation of the heated Matsufuru in a vertical Matsufuru type heat treatment furnace having a cooling zone for cooling the Matsufuru.

And in this invention, the metal strip is arranged in the vertical direction in which the metal strip is guided from top to bottom inside, the heating zone for heating the metal strip passing through the inside of the matsu full from outside the matsu full, And a cooling zone for cooling the heated metal strip at a position downstream of the Matsufuru in the moving direction of the metal strip, wherein the upper end of the Matsufuru is fixed, The pineapple is provided with a stretchable pineapple stretch adjustment zone with the space between the lower end and the cooling zone sealed. The above cooling zone may include a slow cooling zone for gradually cooling the metal strip.

When the upper end of the Matsufuru is fixed, as in the vertical Matsufuru type heat treatment furnace of the present invention, when the metal strip is heated in the heating zone while guiding the metal strip from top to bottom inside the Matsufuru, The pineapples extend downward, and the pineapples do not buckle as in the case where the lower end of the pineapples is fixed.

Further, in the vertical Matsufuru type heat treatment furnace of the present invention, since the space between the lower end of the muffle and the cooling zone is hermetically closed and the stretchable Matsufuru extension adjusting zone is provided as described above, When the Matsufuru stretches downward, the Matsufuru growth is absorbed in the Matsufuru stretch adjustment zone, and the flammable gas in the Matsufuru, including hydrogen gas, is prevented from leaking to the outside and further heated. The oxidation of the stripped metal by contact with the outside air is also suppressed.

Also, in the vertical Matsufuru type heat treatment furnace of the present invention, as described in the above-mentioned publication, a support means for pulling the upper end of the Matsufuru upward is provided, and the support means allows the Matsufur to appropriately extend upward. To control the tensile force There is no need to perform difficult work, and the elongation of the heated pine full can be easily absorbed.

Here, in the vertical Matsufuru type heat treatment furnace according to the present invention, in order to provide a stretchable stretchable Matsufuru expansion zone with the space between the lower end of the Matsufuru and the cooling zone being sealed, for example, A ring-shaped storage portion having a required depth for storing a liquid containing no water is provided at an upper portion, and a cylindrical closing member extending downward is provided at a lower end portion of the pine full. The closing member can be inserted into the liquid accommodated in the accommodation part to make the space between the lower end of the Matsufuru and the cooling zone airtight. In addition, a heat-resistant connecting member made of a bellows-like tubular body that can expand and contract is provided between the lower end of the above-mentioned Matsufuru and the cooling zone, and the connecting member seals the space between the lower end of the Matsufur and the cooling zone. State.

Further, in the vertical Matsufuru heat treatment furnace of the present invention, in order to prevent the water-free liquid in the Matsufuru elongation adjusting zone of the above from evaporating due to heat and to prevent the heat-resistant connecting member from deteriorating, It is preferable to provide a cooling device for cooling the pine-full elongation adjustment zone and a heat insulating member for suppressing heating of the pine-full elongation adjustment zone. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a schematic sectional explanatory view of a vertical Matsufuru type heat treatment furnace according to an embodiment of the present invention.

FIG. 2 is an explanatory cross-sectional view showing a structure of a matsufuru elongation adjusting zone in the vertical matsufuru type heat treatment furnace according to Embodiment 1 of the present invention.

FIG. 3 is an explanatory cross-sectional view showing a structure of a matsufur elongation adjusting zone in a vertical Matsufuru heat treatment furnace according to Embodiment 2 of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, a vertical pine full-type heat treatment furnace according to an embodiment of the present invention will be described with reference to the accompanying drawings. This will be specifically described based on the following. It should be noted that the vertical pine full heat treatment furnace according to the present invention is not limited to the one shown in the following embodiment, but can be carried out by appropriately changing the scope of the invention without changing the gist of the invention.

(Example 1)

In the vertical Matsufuru type heat treatment furnace of Example 1, as shown in FIG. 1, the metal strip 2 guided through the guideway 1 is moved from the upper end of the muffle 11 filled with a reducing gas such as hydrogen gas. The metal strip 2 is guided from the top to the bottom inside the Matsufuru 1 1.

Further, a heating zone 12 provided with a heating means (not shown) such as a burner is provided on the outer periphery of the Matsufuru 11, and the heating zone 12 allows the inside of the Matsufuru 11 from above to outside as described above. The metal strip 2 moving from the top to the bottom is heated, and the metal strip 2 is heated to about 850 to 115 ° C. Then, the metal strip 2 thus heated is passed through a stretchable stretch adjusting band 30 provided so as to seal between the pine full 11 and the cooling zone 20 so as to be closed. The metal strip 2 is guided to a cooling zone 20 where the metal strip 2 is cooled and annealed in the cooling zone 20. In the cooling zone 20, a slow cooling zone (not shown) for gradually cooling the metal strip 2 may be provided.

Here, in the vertical Matsufuru type heat treatment furnace of Example 1, as shown in FIG. 1, a flange 13 is attached to the upper end of the above Matsufuru 11 and fixing means 14 is provided through the flange 13. When Matsufuru 11 is suspended by fixing the upper end of Matsufuru 1 1, and when the metal strip 2 passing through the inside of Matsufuru 11 in heating zone 12 is heated as described above, Matsufuru 1 1 Extends downward.

Further, in the vertical Matsufuru-type heat treatment の of Example 1, as shown in FIG. 2, as a stretchable Matsufuru elongation adjusting zone 30 for sealing between the Matsufuru 11 and the cooling zone 20, Above the cooling zone 20, a liquid 3 1 containing no water is stored. And a cylindrical closing member 34 extending downward through a flange 33 at the lower end of the above-mentioned Matsufuru 11. In this case, the closing member 34 is inserted into the liquid 31 accommodated in the accommodating portion 32 to seal the space between the lower end portion of the Matsufuru 11 and the cooling zone 20. The liquid 31 containing no water may be any liquid that does not affect the dew point inside Matsufuru 11.For example, a commonly used tarpin oil or the like is circulated while being cooled. be able to.

Further, in the vertical Matsufuru type heat treatment furnace of Example 1, the above-mentioned water-free liquid 31 is prevented from evaporating when the temperature of the Matsufuru elongation adjusting zone 30 is increased. On the inner peripheral side of the cylindrical closing member 34, a ring-shaped water-cooling cooling wall 35 extending downward from the flange 33 provided at the lower end of the above matsufuru 11 is provided. At the same time, the inner peripheral portion of the housing portion 32 is also formed of the same water-cooled cooling wall 32a.

In the vertical Matsufuru type heat treatment furnace of Example 1, the metal strip 2 was moved from top to bottom in the Matsufuru 11 as described above, while passing through the Matsufuru 11 in the heating zone 12. If the Matsufuru 11 is extended downward when the trip 2 is heated, the closing member 34 provided at the lower end of the Matsufuru 11 is accordingly accommodated in the accommodation portion 32. Moving downward in the liquid 31, the elongation of the muffle 11 is absorbed in the pine full elongation adjustment zone 30, and the pine full 11 does not buckle. Further, when the Matsufuru 11 extends downward as described above, the closing member 34 provided at the lower end of the Matsufuru 11 extends downward in the liquid 31 accommodated in the accommodation portion 32. It only moves, and the space between the lower end of the pine full 11 and the cooling zone 20 is maintained in a sealed state, and the heated metal strip 2 is not oxidized by contact with the outside air or the like.

Further, in the vertical pine full-type heat treatment furnace of Example 1, since the temperature of the pine full elongation adjusting zone 30 is suppressed from increasing as described above, the liquid 31 containing no water is used. Evaporation is prevented, so that it can be used stably for a long time become.

(Example 2)

In the vertical Matsufuru heat treatment furnace of the second embodiment, the stretchable Matsufuru elongation adjusting zone 30 for sealing the space between the Matsufuru 11 and the cooling zone 20 is provided with the vertical Matsufuru heat treatment furnace of the first embodiment. Except for the furnace, the configuration is otherwise the same as that of the vertical muffle type heat treatment furnace of Example 1 described above.

Here, in the vertical Matsufuru type heat treatment furnace of Example 2, the above-mentioned Matsufuru elongation adjusting zone 30 was expanded and contracted between the lower end of Matsufuru 11 and the cooling zone 20 as shown in FIG. A heat-resistant connecting member 36 made of a bellows-like cylindrical body is provided, and the connecting member 36 closes the space between the lower end portion of the Matsufuru 11 and the cooling zone 20.

Further, in the vertical Matsufuru type heat treatment furnace of Example 2, the heat-resistant connecting member 36 is also prevented from deteriorating when the temperature of the Matsufuru growth regulation zone 30 becomes high, so that this connection is performed. On the inner peripheral side of the member 36, a ring-shaped water-cooling type cooling wall 37 is provided upward from the above-mentioned cooling zone 20, and further on the inner peripheral side of the cooling wall 37. A water-cooled cooling wall 35 is provided in a ring shape downward from a flange 33 provided at the lower end of the above-mentioned Matsufuru 11.

Then, in the vertical Matsufuru type heat treatment furnace of Example 2, while moving the metal strip 2 from the top to the bottom in the Matsufuru 11 as described above, the metal strip 2 was passed through the Matsufuru 11 in the heating zone 12. When the muffle 11 is extended downward when the muffle 2 is heated, the heat-resistant connecting member 36 contracts accordingly, and the elongation of the pine full 11 is absorbed in the pine full elongation adjustment band 30. No buckling of Matsufuru 11 occurs. In addition, the space between the lower end of the Matsufuru 11 and the cooling zone 20 is maintained in a sealed state by the heat-resistant connecting member 35 described above, and the heated metal strip 2 is exposed to outside air or the like. It is not oxidized. Industrial applicability As described in detail above, in the present invention, the pine fulcrum in which the metal strip is guided from the top to the bottom in the vertical direction, and the metal strip passing through the inside of the matsufle from outside the pine full And a cooling zone for cooling the heated metal strip at a position downstream of the Matsufuru in the direction of movement of the metal strip, wherein the Matsufuru type heat treatment furnace comprises: Because the upper end is fixed, when the metal strip is heated in the heating zone while guiding the metal strip from top to bottom inside the pine ful, the matsu ful extends downward, and the lower end of the matsu full is fixed. Pine full does not buckle as in the case of

Further, in the vertical Matsufuru type heat treatment furnace of the present invention, since the Matsufuru elongation adjusting zone is provided in a state in which the lower end of the Matsufuru and the cooling zone are sealed in a closed state, and the Matsufuru can be stretched downward as described above. In this case, the elongation of the Matsufuru is easily absorbed in the Matsufuru elongation adjustment zone, and the flammable gas in the Matsufuru, including hydrogen gas, is prevented from leaking to the outside, and further heated. In addition, the metal strip is reliably prevented from being oxidized by contact with the outside air.

Claims

The scope of the claims

1. A vertically arranged pine full in which a metal strip is guided from top to bottom, a heating zone for heating the metal strip passing through the inside of the matsu full from outside the matsu full, and In a vertical Matsufuru type heat treatment furnace having a cooling zone for cooling the heated metal strip at a position downstream of the metal strip in the moving direction, the upper end of the Matsufuru is fixed, and the lower end of the Matsufuru is fixed. A pine-full extension adjustment band is provided, which is capable of expanding and contracting the space between the section and the cooling zone in a sealed state.

2. The vertical Matsufuru type heat treatment furnace according to claim 1, wherein the Matsufuru elongation adjusting zone is a ring having a required depth in which a liquid containing no water is accommodated above the cooling zone. And a cylindrical closing member extending downward at the lower end of the pineapple, and the closing member is inserted into the liquid stored in the storing portion. The space between the lower end of Matsufuru and the cooling zone is sealed.

3. In the vertical Matsufuru type heat treatment furnace described in claim 1, the pine full elongation adjustment zone is provided between a lower end of the matsu full and the cooling zone. This is a heat-resistant connecting member made of a bellows-like cylindrical body.

4. The vertical Matsufuru type heat treatment furnace according to any one of claims 1 to 3, further comprising a cooling device for cooling the Matsufuru elongation adjustment zone.

5. The vertical Matsufuru type heat treatment furnace according to any one of Claims 1 to 4, further comprising a heat insulating member for suppressing heating of the Matsufuru elongation adjusting zone.