JP3533041B2 - Different atmosphere gas continuous heat treatment furnace and continuous heat treatment method - Google Patents

Description

Detailed Description of the Invention

[0001]

The present invention relates to, using the heterologous atmospheric gas relates continuously heterologous atmospheric gas continuous heat treatment furnace and a continuous heat treatment method for heat treating a workpiece of the metal strip such as, in particular, an atmosphere different large components The present invention relates to a continuous heat treatment furnace of different atmosphere gas and a continuous heat treatment method when a gas is used or when the constituent conditions of the atmosphere gas are severe.

[0002]

2. Description of the Related Art In continuous heat treatment of different atmosphere gas using different atmospheres, a plurality of processing chambers partitioned by partition walls are connected,
A different atmosphere gas such as an inert gas, a reducing gas, or a cooling gas is passed through each processing chamber, and the material to be processed such as a metal band is continuously conveyed through an opening provided in the partition wall to perform an annealing treatment or a reduction treatment. Is a heat treatment for performing.

As a conventional processing furnace of this type, there is, for example, a continuous processing apparatus disclosed in Japanese Unexamined Patent Publication No. 5-125451, and its outline is shown in FIG.

In the continuous heat treatment furnace 1, a plurality of processing chambers 3a and 3b partitioned by a partition wall 2 are connected to each other, and each processing chamber 3 is separated from the partition wall 2.
Different atmosphere gases such as an inert gas, a reducing gas, and a cooling gas are passed through a and 3b, respectively, and the material 5 to be treated such as a metal band is continuously conveyed through the opening 4 provided in the partition wall 2. Perform processing. The partition wall 2 is divided into three chambers in the conveying direction 6 of the material to be treated, and supply ducts 7a and 7b for circulating gas are provided on both sides facing the treatment chambers 3a and 3b, and an exhaust duct 8 is provided at the center.
Gas supply slits 9a, 9b are provided on the side of the supply ducts 7a, 7b facing the opening 4 and a mixed gas suction hole 10 is provided on the side of the exhaust duct 8 facing the opening 4. . Respective supply ducts 7a, 7b are connected to circulation ducts 12a, 12b for circulating the atmospheric gas in the processing chambers 3a, 3b through blowers 11a, 11b, and supply pipes 13a, 13b for replenishing the reduced atmospheric gas. Further, the exhaust duct 8 is connected to the exhaust duct 8 via a blower 14.
A discharge pipe 15 for discharging the gas therein is connected.

When performing heat treatment using the continuous heat treatment furnace 1, circulating gas is supplied from the supply ducts 7a and 7b, respectively. In this case, a gas cushion 16 for isolating the processing chambers 3a and 3b from each other is formed at a position where the circulating gas in the opening 4 contacts, but at the same time, a part of the atmospheric gas is mixed at this position. The mixed atmosphere gas is sucked through the mixed gas suction hole 10 and discharged through the exhaust duct 8 and the exhaust pipe 15 to the outside of the system in a timely manner, so that the mixed atmosphere gas or different kinds of atmospheric gas flows into the processing chambers 3a and 3b. This is prevented and the atmospheric gas conditions in the processing chambers 3a and 3b are established.

[0006]

The above continuous processing apparatus is
The partition wall 2 is intended to prevent the heterogeneous atmosphere gas from flowing into the processing chamber. However, when the components of the heterogeneous atmosphere gas are significantly different or the constituent conditions of the atmosphere gas are severe, the atmospheric gas conditions of the treatment chamber are Is difficult to establish, and it is necessary to increase the amount of exhaust gas, that is, the amount of expensive atmosphere gas supplied.

In view of the above problems, the present invention provides a continuous heat treatment furnace of different atmosphere gas and a continuous heat treatment method capable of preventing the inflow and mixing of different atmosphere gases into the processing chamber with a small amount of supply atmosphere gas and performing excellent processing. The purpose is to do.

[0008]

The present invention advantageously solves the above-mentioned problems and focuses on the influence of the shape of the material to be treated on the atmospheric flow and the unsteady flow due to the collision of the atmospheric gas flows. However, it is possible to prevent the inflow and mixing of different atmosphere gases into the processing chamber with a small amount of the supply atmosphere gas and to perform excellent processing, and the following (1) to ( 1
It is as 7 ).

[0009] (1) a process chamber which are partitioned by partition walls and a plurality coupled, heterogeneous atmospheric gas continuous heat treatment furnace der performing continuously conveyed to process the material to be treated through the opening provided in the partition wall
Thus , the partition wall is divided into three chambers in the conveyance direction of the material to be treated,
A circulating duct through the processing chamber and the circulating gas suction port, a circulating gas supply duct connected by a blower are formed in both chambers, and an exhaust duct is formed in the central chamber, and the circulating gas supply duct has an opening. Gas supply slit on the side facing
Further, in a different atmosphere gas continuous heat treatment furnace in which mixed gas suction holes are provided on the side facing the opening of the exhaust duct,
A continuous heat treatment furnace for different atmosphere gases, characterized in that supply pipes for venting different atmosphere gases are installed on both outsides of the circulating gas suction port.

[0010] (2) on at least one side of the processing chamber of the partition wall, of the circulating gas suction port provided been the processing chamber partition
Side part and the supply for supplying the atmospheric gas of the processing chamber
The part on the side far from the partition wall of the processing chamber where the pipe is installed is
A shielding wall cut, heterologous atmospheric gas continuous heat treatment furnace (1), characterized in that at least one or more over established the shielding wall having an opening for passing plate material to be treated.

[0011]

[0012] (3) in front of the <br/> gas supply slit in the conveying direction of the material to be treated angle and / or of the circulating gas
The angle of the processing chamber side of the supply duct is 30 to 75 from the transport direction.
The continuous heat treatment furnace of different atmosphere gas according to (1) or (2) above, wherein

[0013]

[0014] (4) in the conveying direction of the material to be treated in the rear of the <br/> gas supply slit angle and / or of the circulating gas
The angle on the processing chamber side of the supply duct is 105 to 1 from the transport direction.
The continuous heat treatment furnace for different atmosphere gases according to any one of (1) to ( 3 ) above, wherein the furnace is 50 °.

[0015]

[0016] (5) blower, characterized through the atmosphere component adjustment device, wherein a supply pipe for venting one side of the processing chamber of the atmosphere gas of the partition wall, that is disposed a connection pipe for connecting the exhaust duct The different atmosphere gas continuous heat treatment furnace according to any one of (1) to ( 4 ) above.

( 6 ) A continuous gas heat treatment for different atmospheres according to any one of the above (1) to ( 5 ), wherein the circulating gas suction port is provided with a circulating gas trading port having an opening only on the partition side. Furnace.

( 7 ) An end face suction hole is provided in the end face of the chamber in the center of the partition wall (the end face in the plate width direction of the material to be processed and / or the end face in the direction perpendicular to the plate surface of the material to be treated). The different atmosphere gas continuous heat treatment furnace according to any one of (1) to ( 6 ) above. (8) At least one side of the circulation duct
In addition, a circulating gas temperature adjusting device is provided.
Continuation of different atmosphere gas according to any one of (1) to (7) above
Heat treatment furnace.

( 9 ) A continuous heat treatment method of different atmosphere gases using two or more kinds of atmosphere gases, wherein a partition wall having an opening for passing through the processed material is provided at the boundary of the processing chambers filled with the different atmosphere gas, A plurality of processing chambers partitioned by the partition walls are connected to each other, the partition walls are divided into three chambers in the transport direction of the material to be processed, a supply duct for circulating gas is formed in both chambers, and an exhaust duct is formed in the central chamber. Then, the circulating gas sucked from the processing chamber is supplied from the gas supply slit on the side facing the opening of the circulating gas supply duct, and the mixed gas is sucked from the mixed gas suction hole on the side facing the opening of the exhaust duct. Method for continuous heat treatment of different atmosphere gas by sucking air and discharging it through exhaust duct
In the continuous heat treatment method for different atmosphere gases, the atmosphere gas is ventilated on both outer sides of the circulating gas suction portion.

[0020] (10) on at least one side of the processing chamber of the partition wall, of the circulating gas suction port said processing chamber which is arranged septum
The part on the wall side and the above-mentioned supply for supplying the atmospheric gas of the processing chamber
The portion of the processing chamber in which the supply pipe is disposed, which is far from the partition wall (processing).
Rishitsu body) and a shield wall that partitions the at least one or more on setting the shielding wall having an opening for passing plate material to be treated,
Sucks the circulating gas from nearest shield wall a processing chamber between the partition walls in the partition wall, the partition wall farthest shield wall from the partition wall
Atmosphere gas is vented to the processing chamber (processing chamber body) on the opposite side.
From the processing chamber body side to the partition side through the opening of the shielding wall
The continuous heat treatment method of different atmosphere gases according to ( 9 ) above, characterized in that an unmixed atmosphere gas flow is created .

[0021]

[0022] (11) the circulation amount of gas flow toward from the gas supply slit in the material to be treated, a furnace pressure of the processing chamber, before
The inflow amount of the different atmosphere gas into the processing chamber is controlled by adjusting any one or more of the exhaust gas amounts . The different kinds of the above (9) and (10). Atmosphere gas continuous heat treatment method.

[0023]

[0024]

[0025] (12) performs a component analysis of the discharged gas mixture, any heterologous atmospheric gas in the to and controlling the inflow into the processing chamber heterologous ambient gas (9) to (11) Continuous heat treatment method.

[0026] (13) wherein the discharged mixture gas component adjustment, either heterologous atmospheric gas continuous heat treatment of above, wherein the bubbling atmospheric gas on one side of the processing chamber partition wall (9) - (12) Method.

( 14 ) The continuous atmosphere gas continuous heat treatment method according to any one of the above ( 9 ) to ( 13 ), wherein the circulating gas is sucked in from the partition wall side direction of the circulating gas suction port.

[0028] (15) the end face of the plate width direction of the end face of the central chamber of the partition wall (the material to be treated, and / or, of the material to be treated
Sucking the atmosphere gas from the end face suction hole provided in the direction end surface of) perpendicular to the plate surface, characterized by discharging the (9)
~ The different atmosphere gas continuous heat treatment method of any one of ( 14 ).

[0029]

[0030] (16) on at least one side of the circulation duct is provided with a temperature adjusting device of the circulating gas, by adjusting the temperature of the circulating gas, the (9, characterized by adjusting the sheet temperature of the material to be treated )-( 15 ) The continuous heat treatment method for different atmosphere gases.

( 17 ) Depending on the conveying speed of the material to be treated,
The continuous heat treatment method for different atmosphere gases according to any one of (9) to (16) , characterized in that the amount of the circulating gas flowing from the gas supply slit toward the material to be treated is adjusted.

The present invention will be described in detail below.

The inventors of the present invention have paid close attention to the behavior of the gas flow in the furnace of the continuous heat treatment furnace for different atmospheres, and have conducted a detailed investigation. As a result, the structure of the furnace before and after the partition wall, the position of suction of the circulating gas, and the different kinds of It was found that the position of the supply of the atmospheric gas of 1 strongly influences the inflow amount of the different atmospheric gas into the processing chamber, that is, the pollution.

FIG. 1 shows an example of a continuous heat treatment furnace for different atmosphere gases of the present invention.

In the continuous heat treatment furnace 1, the processing chambers 3a and 3b partitioned by the partition wall 2 are connected to each other, and one shielding wall 21a and 21b is installed on each side of the partition wall 2 in the conveying direction 6 of the material to be processed. ing. The partition wall 2 is divided into three chambers in the conveying direction 6 of the material to be processed, and the supply ducts 7a and 7b for circulating gas are formed in the chambers on both sides facing the processing chambers 3a and 3b, and the exhaust duct 8 is formed in the central chamber. , Gas supply slits 9a, 9b on the side of the supply ducts 7a, 7b facing the opening 4, and the exhaust duct 8
The mixed gas suction holes 10 are provided on the sides facing the openings 4. A blower 1 is provided in each supply duct 7a, 7b.
Part 2 of the processing chamber partitioned by a shielding wall via 1a and 11b
Circulation duct 12 for circulating the atmosphere gas of 2a and 22b
a, 12b are connected, and the blower 1 is installed in the exhaust duct 8.
Exhaust pipe 15 for exhausting gas in the exhaust duct 8 via
Are connected. Further, the material 5 to be processed is conveyed through the opening 4. Further, on both outsides of the shielding walls 21a and 21b,
The supply pipes 13a 'and 13b' of different atmosphere gases are connected.

When the treatment is carried out by the continuous heat treatment furnace 1,
Circulating gas is supplied from the supply ducts 7a and 7b. In this case, a part of the atmospheric gas mixes in the portion of the opening 4 where the supply gas contacts. Part of this mixed gas forms a complicated circulating gas flow 18 in the portions 22a and 22b of the processing chambers partitioned by the shielding wall, and part of the mixed gas tries to flow into the processing chambers 3a and 3b. In addition, the partition wall 2 is accompanied by the material 5 to be treated.
There is also a gas flow 20 accompanying the material to be processed which is going to pass through the opening 4 of the shielding walls 21a and 21b, or a gas flow caused by the furnace pressure difference between the front and rear processing chambers 3a and 3b. In the continuous heat treatment furnace 1, the mixed gas is sucked through the mixed gas suction hole 10, and the exhaust duct 8 and the exhaust pipe 1
And the processing chambers 3a, 3
b through the supply pipes 13a ′ and 13b ′, and the heterogeneous atmosphere gas flow 19 which is not mixed in the direction of the portions 22a and 22b of the processing chambers partitioned by the shielding walls from the processing chambers 3a and 3b, respectively. This prevents the mixed atmosphere gas or the different atmosphere gases from flowing into the main bodies of the processing chambers 3a and 3b through the portions 22a and 22b of the processing chambers partitioned by the shielding wall, and the processing chambers 3a and 3b are prevented. Ensure a clean atmosphere gas inside the body of the.

Since the partition wall 2 and the shielding walls 21a and 21b have the above-described actions, the atmospheric gas in the main body of the processing chambers 3a and 3b is not polluted and only the original atmospheric gas is continuously supplied, and the material to be processed is In addition to ensuring the quality of No. 5, it is not necessary to supply a large amount of atmospheric gas in order to ensure the atmospheric density.

[0038] Incidentally, the shield wall always will be no need to Installation, for example, combined consider the severity or the like of the component conditions of the atmosphere, as required, on both sides of the partition wall 2 treatment chamber or one side of the
It may be installed in the processing chamber . Also, the number of shielding walls may be determined in consideration of the strictness of the composition conditions of the atmosphere, the stability of operation, and the like.

The angle of the gas supply slit 9a on the front side in the carrying direction 6 of the material to be processed is 30 to 75 ° from the carrying direction.
Is preferred. If the angle is less than 30 ° from the transport direction, the effect of cutting the flow of the gas-accompanied flow of the material to be treated 5 decreases, and the size of the partition wall 2 in the transport direction 6 of the material to be treated becomes too large. The mixing of the gas from the gas supply slits 9b in the upper and lower surfaces of the processed material 5 on both sides in the width direction of the processed material 5 becomes too large. Similarly, the angle of the gas supply slit 9b on the rear side in the carrying direction 6 of the material to be processed is preferably 105 to 150 ° from the carrying direction.
Yes. If the angle is more than 150 ° from the conveying direction, the effect of cutting the flow of the gas-entrained flow of the material to be treated 5 is reduced, and the size of the partition wall 2 in the conveying direction 6 of the material to be treated becomes too large. The mixing of the gas from the gas supply slits 9a in the upper and lower surfaces of the processed material 5 on both sides of the processed material 5 in the width direction becomes too large.

The angle of the supply duct 7a of the circulating gas on the front side in the carrying direction 6 of the material to be processed on the processing chamber 3a side is from the carrying direction.
It is preferably 30 to 75 °. If the angle is less than 30 ° from the conveying direction, the size of the partition wall 2 in the conveying direction 6 of the material to be treated becomes too large, and if it exceeds 75 °, the flow of the circulating gas spreads over a wide range and the gas mixing becomes too large.
Similarly, the angle of the circulating gas supply duct 7b on the rear side in the conveying direction 6 of the material to be treated on the side of the processing chamber 3b is 10 from the conveying direction.
It is preferably 5 to 150 °. If the angle exceeds 150 ° from the transport direction, the size of the partition wall 2 in the transport direction 6 of the material to be processed becomes too large, and if it is less than 105 °, the flow of the circulating gas spreads over a wide range, and the gas mixing becomes too large.

The circulation gas is sucked from the circulation gas inlet having an opening only on the partition wall side, so that the circulation gas flow 18 in the portions 22a and 22b of the processing chambers partitioned by the shielding wall 18
The atmosphere gas supplied to the processing chambers 3a and 3b is made simpler, and the heterogeneous atmosphere gas flow 19 which has not been mixed is more effectively functioned, and the atmosphere gas is stable and free from contamination in the main body of the processing chambers 3a and 3b. Secure.

Further, an end face suction hole is provided in the end face of the chamber in the center of the partition wall (the end face in the plate width direction of the material to be processed and / or the end face in the direction perpendicular to the plate surface of the material to be treated). By exhausting the sucked atmospheric gas through the exhaust pipe 15, it was partitioned by a shielding wall for different kinds of atmospheric gas from the side gap (gap between the furnace body and the partition wall) caused by the difference in furnace pressure between the front and rear processing chambers 3a, 3b. It is possible to prevent the inflow into the processing chambers 22a and 22b and the contamination of the atmospheric gas in the processing chambers 3a and 3b due to the inflow, and to secure a more stable atmosphere gas without contamination in the main bodies of the processing chambers 3a and 3b. It should be noted that instead of providing an end face suction hole on the end face of the chamber in the center of the partition wall (the end face in the plate width direction of the material to be processed and / or the end face in the direction perpendicular to the plate surface of the material to be processed), a surface is provided on this end surface. Install a suction hole in the furnace shell to
The same effect can be obtained by connecting to the atmosphere exhaust pipe.

The amount of gas flowing from the gas supply slits 9a and 9b toward the material 5 to be treated, the furnace pressure of the processing chambers 3a and 3b, or the amount of exhaust gas and the amount of different atmosphere gas flowing into the processing chambers 3a and 3b are determined. These are related, and by controlling these, it is possible to control the inflow amount of the different atmosphere gas into the processing chambers 3a and 3b. Furthermore, by analyzing the components of the exhaust gas, the partition walls 21a and 21b and the processing chambers 3a and 3b are
The atmosphere flow of the different atmosphere gas processing chamber 3a,
It is possible to control the inflow to 3b.

In addition, depending on the conveying speed of the material 5 to be treated,
By controlling the amount of gas flowing from the gas supply slits 9a and 9b toward the processing target material 5, it is possible to make the inflow amount of the different atmosphere gas into the processing chambers 3a and 3b constant regardless of the transport speed.

Further, the composition of the mixed gas discharged from the exhaust duct 8 is adjusted, and the mixed gas is ventilated to the processing chamber 3a or the processing chamber 3b on one side of the partition wall 2, whereby the atmospheric gas can be greatly reduced.

Alternatively, a circulating gas temperature adjusting device is provided on at least one side of the circulation ducts 12a and 12b to change the temperature of the material 5 to be processed from the temperature in the processing chamber 3a to the target (reached) temperature in the processing chamber 3b. It is possible.

If side seal plates are attached to both end surfaces of the partition wall 2 having the above structure, the leakage of the atmospheric gas ejected from the end surfaces can be prevented and the waste of the atmospheric gas can be eliminated. Further, by purifying the mixed gas discharged from the exhaust duct 8 and reusing it, waste of the atmospheric gas can be eliminated.

The structure of the continuous heat treatment furnace may be either a vertical furnace or a horizontal furnace.

[0049]

FIG. 1 shows an example of a continuous heat treatment furnace for different atmosphere gases according to the present invention.

The continuous heat treatment furnace 1 is a decarburizing / reducing furnace for non-oriented silicon steel sheets. The processing chambers 3a and 3b for decarburization / reduction processing, which are partitioned by the partition wall 2, are connected to each other, and shielding walls 21a and 21b are installed on both sides of the partition wall 2 in the conveying direction 6 of the material to be processed. The material 5 to be processed is continuously processed while being conveyed through the partition walls 2 and the openings 4 provided in the shielding walls 21a and 21b. The partition wall 2 is divided into three chambers in the conveying direction 6 of the material to be processed, and the supply ducts 7a and 7b for circulating gas are formed in the chambers on both sides facing the processing chambers 3a and 3b, and the exhaust duct 8 is formed in the central chamber. The gas supply slits 9a and 9b are provided on the side of the supply ducts 7a and 7b facing the opening 4, and the mixed gas suction hole 10 is provided on the side of the exhaust duct 8 facing the opening 4. The angles of the gas supply slits 9a and 9b are 60 ° and 150 ° with respect to the conveying direction 6 of the material to be processed, and the angles on both sides of the partition wall 2 are 60 ° with respect to the conveying direction 6 of the material to be processed. It is 150 °.

The blower 1 is attached to each supply duct 7a, 7b.
Part 2 of the processing chamber partitioned by a shielding wall via 1a and 11b
Circulation duct 12 for circulating the atmosphere gas of 2a and 22b
a, 12b are connected, and the blower 1 is installed in the exhaust duct 8.
Exhaust pipe 15 for exhausting gas in the exhaust duct 8 via
Are connected. A supply pipe 13 for supplying a decarburizing atmosphere gas is provided on both outer sides of the shielding walls 21a and 21b.
a ′ and a supply pipe 13b ′ for supplying a reducing atmosphere gas are connected.

When the heat treatment is performed in the continuous heat treatment furnace 1, the circulating gas is supplied from the supply ducts 7a, 7b to the main bodies of the processing chambers 3a, 3b, and a part of the mixed gas of the circulating gas is introduced by the mixed gas suction hole 10. It is sucked, and is discharged to the outside of the system at appropriate time through the exhaust duct 8 and the exhaust pipe 15. On the other hand, the supplemental atmosphere gas is supplied from the supply pipes 13a 'and 13b' to the processing chambers 3a and 3b.
Part 22a, 22b of the processing chamber that is supplied to the main body of the chamber and is mixed with or mixed with a different atmosphere gas by the shielding wall
It was possible to prevent the gas from flowing into the main bodies of the processing chambers 3a and 3b through the above, and to secure a clean atmosphere gas in the main bodies of the processing chambers 3a and 3b.

FIG. 2 shows another example of the continuous heat treatment furnace for different atmosphere gases of the present invention.

The continuous heat treatment furnace 1 is a decarburization / reduction furnace for grain-oriented silicon steel sheets. The difference from the heat treatment furnace shown in FIG.
Since the composition conditions of the atmosphere are very strict, a plurality of shielding walls 21a, 21a ', 21b, 21b' are installed in front of and behind the partition wall 2 and a roll for conveying the material 5 to be processed for stable threading. That is, 51a and 51b are installed near the partition wall 2. By installing multiple shielding walls, we were able to secure even more rigorous compositional conditions.

FIG. 4 shows still another example of the continuous heat treatment furnace for different atmosphere gases of the present invention.

The continuous heat treatment furnace 1 is also a decarburization / reduction furnace for grain-oriented silicon steel sheets. 2 is different from FIG. 2 in that the exhaust pipe 15 is connected to the atmospheric gas supply pipe 13a ′ of the processing chamber 3a for decarburizing processing through the blower 14, the connecting pipe 62, and the atmospheric component adjusting device (humidifier) 61. It is that you are.

When the heat treatment is carried out in the continuous heat treatment furnace 1, the difference between the atmospheric gas components ventilated in the treatment chamber 3a for decarburization and the treatment chamber 3b for reduction treatment is only the water content, and the gas is discharged from the discharge pipe 15. The water content of the mixed gas is a mixture of the water content of both atmosphere gases,
The atmosphere component adjusting device 61 can easily humidify and adjust to the atmosphere gas component of the processing chamber 3a in which decarburization processing is performed.

In this way, it is possible to significantly reduce the amount of atmospheric gas used, while securing the strict atmospheric component conditions.

FIG. 5 shows still another example of the continuous atmosphere gas continuous heat treatment furnace of the present invention.

The continuous heat treatment furnace 1 is also a decarburization / reduction furnace for non-oriented silicon steel sheets. The difference from FIG. 1 is that the circulating gas suction port 71 has a circulating gas inlet 71 having an opening only on the partition side.
a and 71b are installed, and an end face suction hole is formed in the end face of the chamber in the center of the partition wall (the end face in the plate width direction of the material to be processed and / or the end face in the direction perpendicular to the plate surface of the material to be treated). 81 is provided (only the plate width direction of the processed material is shown).
As a result, it is possible to secure a more stable atmosphere gas without contamination in the main bodies of the processing chambers 3a and 3b, and to reduce the amount of atmospheric gas supplied to the front and rear processing chambers 3a and 3b.

FIG. 6 shows still another example of the continuous heat treatment furnace for different atmosphere gases of the present invention.

The continuous heat treatment furnace 1 is an annealing furnace for stainless steel plates. What is different from FIG. 1 is that the furnace is a vertical type and that a circulation gas cooling device 91b is provided in the circulation duct 12b.

The continuous heat treatment furnace 1 comprises a processing chamber 3a for performing bright annealing in a hydrogen atmosphere and a processing chamber 3b for performing cooling processing in a hydrogen + nitrogen atmosphere. In the case of performing heat treatment, by cooling the circulating gas in the circulating duct 12b, the partition walls 2 between the processing chambers can be used as a cooling device while ensuring the strict atmosphere component condition.

[0064]

According to the continuous heat treatment furnace for different atmosphere gases and the heat treatment method of the present invention, a small amount of ambient gas can be supplied.
Inflow and mixing of different kinds of atmospheric gas into the processing chamber are prevented, and the atmospheric gas in the processing chamber is not polluted.
The quality of the processed material is secured. Further, it is not necessary to supply a large amount of atmospheric gas, and the operating cost can be reduced.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view showing an example of a different atmosphere gas continuous heat treatment furnace of the present invention.

FIG. 2 is a schematic cross-sectional view showing another example of the different atmosphere gas continuous heat treatment furnace of the present invention.

FIG. 3 is a schematic sectional view showing an example of a conventional continuous heat treatment apparatus for different atmosphere gases.

FIG. 4 is a schematic cross-sectional view showing still another example of the different atmosphere gas continuous heat treatment furnace of the present invention.

FIG. 5 is a schematic cross-sectional view showing still another example of the different atmosphere gas continuous heat treatment furnace of the present invention.

FIG. 6 is a schematic cross-sectional view showing still another example of the different atmosphere gas continuous heat treatment furnace of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Continuous heat treatment furnace 2 Partition walls 3a, 3b Processing chamber 4 Opening 5 Material to be processed 6 Transfer direction of material 7a, 7b Supply duct 8 for circulating gas Exhaust ducts 9a, 9b Gas supply slit 10 Mixed gas suction holes 11a, 11b , 14 Blowers 12a, 12b Circulation ducts 13a, 13b Supply pipes 13a ', 13b' Supply pipe 15 Discharge pipe 16 Gas cushion 17 Gas flow in the vicinity of mixed gas suction hole 18 Circulation gas flow 19 Non-mixed atmosphere gas flow 20 Flow of gas accompanying the material to be treated 21a, 21a ', 21b, 21b' Shielding walls 22a, 22a ', 22b, 22b' Part of the processing chamber 51a, 51b partitioned by the shielding wall Conveying roll 61 Atmosphere component adjustment Device 62 Connection pipes 71a, 71b Circulating gas intake 81 End face suction hole 91b Cooling device

Front page continuation (56) Reference JP-A-5-125451 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) C21D 9/56 101 C21D 1/74

Claims (17)

(57) [Claims] 1. A continuous heat treatment furnace for different atmosphere gas, wherein a plurality of processing chambers partitioned by partition walls are connected to each other, and a material to be processed is continuously conveyed through an opening provided in the partition wall for processing.
The partition wall is divided into three chambers in the conveying direction of the material to be treated, and a circulation duct through the circulation gas suction port and a circulation gas supply duct connected by a blower to both chambers and exhaust. Different atmosphere gas with ducts formed in the central chambers, gas supply slits on the side facing the opening of the circulating gas supply duct, and mixed gas suction holes on the side facing the opening of the exhaust duct. In the continuous heat treatment furnace, a continuous atmosphere heat treatment furnace of different kinds of atmosphere is provided with supply pipes for venting different atmosphere gases on both outsides of the circulation gas suction port. On one side of the processing chamber of claim 2 wherein at least the partition wall,
The partition wall side portion of the processing chamber in which the circulating gas suction port is provided
And the supply pipe for supplying the atmospheric gas of the processing chamber.
A partition that separates the part of the processing chamber installed that is far from the partition wall.
A蔽壁, shielding having an opening for passing plate material to be treated
Heterologous atmospheric gas continuous heat treatment furnace according to claim 1, characterized in that at least one or more over established the wall. Supply Da wherein the front of the gas supply slit in the conveying direction of the material to be treated angle and / or the circulation gas
The continuous atmosphere heat treatment furnace for different atmospheres according to claim 1 or 2 , wherein the angle of the heat treatment chamber side is 30 to 75 ° from the transport direction. 4. The angle of the gas supply slit and / or the supply gas of the circulating gas in the rear of the conveyance direction of the material to be processed.
The angle of the processing chamber side is 105 to 150 ° from the transport direction.
Heterologous atmospheric gas continuous heat treatment furnace according to any one of claims 1 to 3, characterized in that the the. 5. Before venting an atmospheric gas in a processing chamber on one side of the partition through a blower and an atmospheric component adjusting device.
Serial supply pipe, heterologous atmospheric gas continuous heat treatment furnace according to any one of claims 1 to 4, characterized in that disposed a connection pipe for connecting the exhaust duct. To wherein said circulating gas Aspirate port, heterologous atmospheric gas continuously according to any one of claims 1 to 5, characterized in that a circulating gas inlet having an opening only on the partition wall side Heat treatment furnace. 7. An end face suction hole is provided in an end face (an end face in the plate width direction of the material to be processed and / or an end face in a direction perpendicular to the plate surface of the material to be processed) of the central chamber of the partition wall. The different atmosphere gas continuous heat treatment furnace according to any one of claims 1 to 7 . 8. The circulation duct is provided on at least one side of the circulation duct.
A ring gas temperature adjusting device is provided.
Item 7. Continuous heat of different atmosphere gas according to any one of items 1 to 7.
Processing furnace. 9. A continuous heat treatment method of different atmosphere gases using two or more kinds of atmosphere gas, wherein a partition wall having an opening for passing through a material to be processed is provided at a boundary of a processing chamber filled with the different atmosphere gas. A plurality of processing chambers partitioned by partition walls are connected to each other, and the partition walls are divided into three chambers in the direction in which the material to be processed is conveyed. Circulating gas supply ducts are formed in both chambers and an exhaust duct is formed in the central chamber. The circulating gas sucked from the processing chamber is supplied from the gas supply slit on the side facing the opening of the circulating gas supply duct, and the mixed gas is sucked from the mixed gas suction hole on the side facing the opening of the exhaust duct. In the continuous heat treatment method of different atmosphere gas which is sucked and discharged through the exhaust duct
And the atmosphere gas is ventilated on both outsides of the suction portion of the circulating gas. 10. A partition wall side of the processing chamber, wherein the circulating gas suction port is provided in at least one processing chamber of the partition wall.
Portion and the supply pipe for supplying the atmospheric gas of the processing chamber
On the side far from the partition wall of the processing chamber where the
A shielding wall for partitioning the body) and, provided at least one or more shielding wall having an opening for passing plate material to be treated, the partition wall
Nearest sucks the circulating gas from the processing chamber between the shielding wall and the partition wall, opposite to the farthest shield wall of the partition from the partition wall to
Atmosphere gas is vented to the side processing chamber (processing chamber body) to shield it.
Mix from the processing chamber body side to the partition side in the opening of the shielding wall.
10. The continuous heat treatment method for different atmosphere gases according to claim 9, wherein the atmosphere gas flow is not generated . Wherein said circulating gas amount flowing toward from the gas supply slit in the material to be treated, a furnace pressure of the processing chamber, the discharge
By adjusting any one or more of the gas quantity, different atmospheric gas continuous heat treatment method according to claim 9 or 10, characterized in that to control the inflow into the processing chamber heterogeneous atmospheric gas. 12. performs component analysis of the mixed gas the discharge, different atmospheric gas according to any one of claims 9 to 11, characterized in that to control the inflow into the processing chamber heterogeneous atmospheric gas Continuous heat treatment method. 13. and component adjusting the mixing gas the discharge,
Heterologous ambient gas continuous heat treatment method according to any one of claims 9 to 12, wherein the bubbling atmospheric gas on one side of the processing chamber of the septum. 14. A claims, characterized in that the circulating gas, to intake from the partition wall side direction of the circulating gas suction port 9-13
The continuous heat treatment method for different atmosphere gases according to any one of 1. 15. is an end of the central chamber of the partition wall (the end surface in the plate width direction of the material to be treated, and / or direction end surface of the perpendicular to the plate surface of the material to be treated) atmospheric gas from the end face suction hole provided in the was aspirated, heterologous ambient gas continuous heat treatment method according to any one of claims 9 to 14, characterized in that for discharging. 16. at least one side of the circulation duct,
The temperature of the circulating gas is provided, and the plate temperature of the material to be processed is adjusted by adjusting the temperature of the circulating gas. The continuous atmosphere of different gases according to any one of claims 9 to 16. Heat treatment method. 17. The method according to claim 9 , wherein the amount of the circulating gas flowing from the gas supply slit toward the material to be processed is adjusted according to the conveying speed of the material to be processed. Continuous heat treatment method for different atmosphere gases.