JP6945115B2 - Vacuum furnace - Google Patents

Description

The present invention relates to a vacuum furnace in which a work carried into a furnace is heat-treated in a plurality of processing chambers.

Heat treatment furnaces that heat-treat the workpieces carried into the furnace in a plurality of processing chambers are widespread. Examples of the plurality of processing chambers include a heating chamber and an oil tank chamber. In this case, the work heated in the heating chamber is moved to the oil tank chamber, immersed in the oil tank, rapidly cooled, and quenched.

The applicant has grasped Patent Documents 1 and 2 listed below as prior documents relating to a technique for performing heat treatment while actually measuring the temperature of a work in a heat treatment furnace having a plurality of processing chambers.

Japanese Patent No. 3836291 Japanese Unexamined Patent Publication No. 2018-91658

Patent Document 1 relates to a box-shaped heat treatment furnace that attempts to detect the actual temperature of the object to be processed in real time when the object to be processed is transferred to a plurality of positions and heat-treated. There is a description of.
[0006]
[Means to solve problems]
The box-shaped heat treatment furnace of the present invention for achieving the above object is a box-shaped heat treatment furnace in which an object to be processed carried into the furnace is transferred to a plurality of positions for heat treatment, and the tip side is introduced into the furnace. At the same time, while holding the sheath wire for temperature measurement that attaches the tip to the object to be processed and the middle part of the sheath wire in the furnace, the sheath wire is routed according to the transfer position of the object to be processed. It is characterized by including a sheath wire holding device that follows the processed material (claim 1).
According to the box-shaped heat treatment furnace configured in this way, the tip of the sheath wire for temperature measurement is attached to the object to be processed, and the intermediate part is held by the sheath wire holding device at the transfer position of the object to be processed. Accordingly, the sheath wire can be routed to follow the object to be treated. Therefore, it is possible to prevent the sheath wire from becoming too loose or too tight.

Patent Document 2 relates to a work temperature measuring device for measuring the temperature of a work arranged inside a housing such as a heat treatment furnace and a heat treatment furnace provided with the device, and has the following description.
[0026]
In the present invention, in particular, the tray 12 is provided with the conduction plate 18, and the elevating elevator 14 is provided with the conduction rod 20. By bringing the conduction plate 18 and the conduction rod 20 into contact with each other to conduct electricity, the thermocouple 22 connected to the continuity plate 18 and the temperature measuring device 24 connected to the conduction rod 20 are electrically connected. With such a configuration, even when the work W is in the relay zone 6 or moves downward or upward from the relay zone 6, the heat treatment furnace 2 is made to conduct by ensuring the contact between the conduction plate 18 and the conduction rod 20. The temperature of the work W arranged inside can be measured in real time by the temperature measuring device 24.
[0027]
The "work temperature measuring device" for measuring the temperature of the work W in the heat treatment furnace 2 described above includes a conduction plate 18, a conduction rod 20, a thermocouple 22, a temperature measuring device 24, and a compensating lead wire 26.

In the technique disclosed in Patent Document 1, the tip of the sheath wire for temperature measurement is attached to the object to be processed, and the sheath wire for temperature measurement is routed according to the transfer position of the object to be processed to measure the object to be processed. It is for warming.
However, in Patent Document 1, the heat treatment furnace and the internal transfer position do not have a closed structure. Therefore, it cannot be applied to a vacuum furnace that performs heat treatment in a vacuum environment.

The technique disclosed in Patent Document 2 is a thermocouple 22 connected to the conduction plate 18 and a temperature measuring device 24 connected to the conduction rod 20 by bringing the conduction plate 18 and the conduction rod 20 into contact with each other to conduct electricity. And electrically connect.
Therefore, in the heating chamber 4 in which the work W is separated from the elevator, the conduction between the conduction plate 18 and the conduction rod 20 is cut off, and the temperature cannot be measured. Further, the application to a vacuum furnace in which heat treatment is performed in a vacuum environment is not considered.

The present invention has been made with the following object in order to solve the above problems.
In a vacuum furnace in which a work carried into a furnace is heat-treated in a plurality of processing chambers, a vacuum furnace capable of actually measuring the temperature of the work in the plurality of processing chambers without interruption is provided.

The vacuum furnace according to claim 1 adopts the following configuration in order to achieve the above object.
A first processing room for processing workpieces,
A second processing chamber having airtightness capable of processing the work in a reduced pressure environment, and
An intermediate space provided between the first processing chamber and the second processing chamber and having the same airtightness as the second processing chamber,
The work that can reach the first processing chamber and the second processing chamber through the intermediate space and is present in the first processing chamber or the second processing chamber depending on the stage of processing. With a temperature measuring line that can measure the temperature
A first airtight door that can airtightly separate the first processing chamber from the intermediate space,
A second airtight door that can airtightly separate the intermediate space from the second processing chamber ,
A tracking means for tracking the temperature measuring line with respect to the work moving between the first processing chamber and the second processing chamber according to the processing stage is provided .
The above-mentioned following means
It has a reel and a reel case for feeding and feeding the temperature measuring wire, and the tip side of the temperature measuring wire is passed through the intermediate space by inserting an insertion hole formed in the wall surface of the intermediate space. By passing the root side of the temperature measuring wire through a seal hole that maintains airtightness, the inside of the reel case is configured to maintain airtightness similar to that of the intermediate space .

The vacuum furnace according to claim 2 adopts the following configuration in addition to the configuration according to claim 1.
The first processing chamber is equipped with a coolant tank.
The temperature measuring line can reach the coolant tank and is configured to measure the temperature of the work existing in the coolant tank.

The vacuum furnace according to claim 3 adopts the following configuration in addition to the configuration according to claim 1 or 2.
It is configured so that the temperature of the work can be measured without interruption while maintaining the airtightness of the processing chamber in which the work exists according to the stage of the treatment.

The vacuum furnace according to claim 1 includes a first processing chamber, a second processing chamber, an intermediate space, a temperature measuring wire, a first airtight door, and a second airtight door. The first processing chamber is for processing a work. The second processing chamber has an airtight performance capable of processing the work in a reduced pressure environment. The intermediate space is provided between the first processing chamber and the second processing chamber, and has the same airtightness as the second processing chamber. The temperature measuring line can reach the first processing chamber and the second processing chamber, respectively, through the intermediate space. The temperature measuring line measures the temperature of the work existing in the first processing chamber or the second processing chamber depending on the stage of processing. The first airtight door can airtightly separate the first processing chamber from the intermediate space. The second airtight door can airtightly separate the intermediate space from the second processing chamber.

When a work is present in the first processing chamber, the temperature of the work is measured by a temperature measuring line that has passed through the intermediate space and reached the first processing chamber. When a work is present in the second processing chamber, the temperature of the work is measured by a temperature measuring line that has passed through the intermediate space and reached the second processing chamber. In such a temperature measuring operation, when the second processing chamber is set to a reduced pressure environment, when measuring the temperature of the work existing in the first processing chamber, the first airtight door is opened and the first first processing chamber is opened. The processing chamber and the intermediate space are communicated with each other, and the second airtight door is closed to airtightly separate the intermediate space from the second processing chamber. As a result, the temperature of the work existing in the first processing chamber can be measured while keeping the second processing chamber in a depressurized state. When measuring the temperature of the work existing in the second processing chamber, the second airtight door is opened to communicate the second processing chamber with the intermediate space, and the first airtight door is closed. The intermediate space and the first processing chamber are airtightly separated from each other. As a result, the temperature of the work existing in the second processing chamber can be measured while keeping the pressure reduced state between the second processing chamber and the intermediate space.
In this way, in a vacuum furnace in which the work carried into the furnace is heat-treated in a plurality of processing chambers, the temperature of the work in the plurality of processing chambers can be actually measured.
Further, a tracking means for tracking the temperature measuring line with respect to the work moving between the first processing chamber and the second processing chamber according to the processing stage is further provided. Therefore, since the temperature measuring line follows the work moving between the first processing chamber and the second processing chamber, the first processing chamber is kept in a decompressed state while the second processing chamber is kept in a decompressed state. Alternatively, the temperature of the work existing in the second processing chamber can be measured.
Further, the following means has a reel and a reel case for feeding and feeding the temperature measuring wire, and the tip side of the temperature measuring wire is inserted through an insertion hole formed in the wall surface of the intermediate space in the middle. It is configured so that the inside of the reel case can maintain the same airtightness as the intermediate space 30 by passing through the space and passing the root side of the temperature measuring line through the seal hole for maintaining the airtightness. ing.

In the vacuum furnace according to claim 2, the first processing chamber is provided with a coolant tank. The temperature measuring line can reach the coolant tank. It is configured so that the temperature of the work present in the coolant can be measured.
As described above, the first airtight door is opened to communicate the first processing chamber with the intermediate space, and the second airtight door is closed to open the intermediate space and the second processing chamber. Separated in an airtight manner. Further, the temperature measuring wire reaches the coolant tank to measure the temperature of the work to be present in the coolant tank. As a result, the temperature of the work existing in the coolant tank can be measured while keeping the second processing chamber in a depressurized state.

The vacuum furnace according to claim 3 is configured so that the temperature of the work can be measured without interruption while maintaining the airtightness of the processing chamber in which the work exists according to the stage of treatment.
Therefore, the temperature of the work can be measured and monitored without interruption according to the processing stage.

It is a figure explaining the whole structure of the embodiment of the vacuum furnace of this invention. It is a figure explaining the use state of the said vacuum furnace. It is a figure explaining the use state of the said vacuum furnace. It is a figure explaining the use state of the said vacuum furnace.

1 to 4 are views for explaining an embodiment of the vacuum furnace of the present invention.

〔overall structure〕
FIG. 1 is a diagram illustrating an overall configuration of the present embodiment.
This vacuum furnace includes a first processing chamber 10 and a second processing chamber 20 for heat-treating the work 1.

[First processing chamber 10]
The first processing chamber 10 has an outer opening 11A and an outer door 11 for loading and unloading the work 1. In this example, the first processing chamber 10 includes a coolant tank 12. That is, a coolant tank 12 in which the coolant for quenching is stored is provided in the lower space of the first processing chamber 10 provided with the outer door 11. The first processing chamber 10 is provided with an elevating table 13 that moves up and down between the first processing chamber 10 and the coolant tank 12 with the work 1 placed therein. As the coolant, for example, oil, water, emulsion or the like can be used.

The first processing chamber 10 has an airtightness capable of processing the work 1 in a reduced pressure environment. Therefore, the outer door 11 functions as an airtight door, and is arranged outside the outer opening 11A in order to ensure the airtightness of the first processing chamber 10 in the decompressed state. The first processing chamber 10 communicates with a first vacuum pump 9 that sucks the gas in the first processing chamber 10.

[Second processing chamber 20]
The second processing chamber 20 has an airtightness capable of processing the work 1 in a reduced pressure environment. A second vacuum pump 21 that sucks the gas in the second processing chamber 20 communicates with the second processing chamber 20. The second processing chamber 20 is provided with a work table 22 on which the work 1 charged therein is placed. In the vicinity of the wall surface of the second processing chamber 20, a heat insulating wall 23 surrounding the work 1 placed on the work table 22 is provided. The space around the work table 22 of the second processing chamber 20 is heated by a heater (not shown).

The heat insulating wall 23 is provided with a third opening 23A in a portion corresponding to the second opening 24A described later. A heat insulating door 35 is provided in the third opening 23A. The heat insulating door 35 is opened and closed when the work 1 is moved between the first processing chamber 10 and the second processing chamber 20, and the work 1 is passed through the third opening 23A. In this example, the heat insulating door 35 slides up and down to open and close, and a third door pocket space 35A is provided in which the heat insulating door 35 slid down and opened is temporarily accommodated.

[Intermediate space 30]
An intermediate space 30 is provided between the first processing chamber 10 and the second processing chamber 20. A first partition wall 14 exists between the first processing chamber 10 and the intermediate space 30, and a second partition wall 24 exists between the intermediate space 30 and the second processing chamber 20. The first partition wall 14 and the second partition wall 24 are provided with a first opening 14A and a second opening 24A for moving the work 1 between the first processing chamber 10 and the second processing chamber 20, respectively. ing. Therefore, when the work 1 is moved between the first processing chamber 10 and the second processing chamber 20, it passes through the intermediate space 30 once.

[Airtight door]
A first airtight door 15 capable of airtightly separating the first processing chamber 10 and the intermediate space 30 is provided in the first opening 14A. The first airtight door 15 is arranged on the side of the first processing chamber 10 of the first opening 14A in order to ensure the airtightness of the intermediate space 30 that has been decompressed. In this example, the first airtight door 15 slides up and down to open and close, and a first door pocket space 15A is provided in which the first airtight door 15 that slides down and opens is temporarily accommodated. There is.

A second airtight door 25 that can airtightly separate the intermediate space 30 and the second processing chamber 20 is provided in the second opening 24A. The second airtight door 25 is arranged on the intermediate space 30 side of the second opening 24A in order to ensure the airtightness of the second processing chamber 20 that has been decompressed. In this example, the second airtight door 25 slides up and down to open and close. The lower space of the intermediate space 30 functions as a second door pocket space 25A in which the second airtight door 25 that is slid downward and opened is temporarily accommodated.

As a result, the intermediate space 30 has the same airtightness as the second processing chamber 20. That is, when the second vacuum pump 21 is operated with the second airtight door 25 closed, the pressure inside the second processing chamber 20 is reduced. When the second vacuum pump 21 is operated with the second airtight door 25 opened and the first airtight door 15 closed, the pressure inside the second processing chamber 20 and the inside of the intermediate space 30 is reduced.

[Temperature measurement line]
The present embodiment has a temperature measuring line 40 that actually measures the temperature of the work 1. As the temperature measuring line 40, for example, a sheath thermocouple can be used. By bringing the tip of the temperature measuring line 40 into contact with the work 1, the temperature of the work 1 can be measured in real time. The root of the temperature measuring line 40 is connected to a measuring instrument (not shown).

The temperature measuring line 40 can reach the first processing chamber 10 and the second processing chamber 20, respectively, through the intermediate space 30. That is, the tip of the intermediate space 30 passes through the first opening 14A and reaches the first processing chamber 10. Further, the tip of the intermediate space 30 passes through the second opening 24A and reaches the second processing chamber 20. Therefore, the temperature of the work 1 existing in the first processing chamber 10 or the second processing chamber 20 can be directly measured according to the stage of processing. The temperature measuring line 40 can also reach the coolant tank 12. Therefore, the temperature of the work 1 existing in the coolant tank 12 can be directly measured.

[Following means]
In this embodiment, the temperature is measured with respect to the work 1 that moves between the first processing chamber 10 and the second processing chamber 20 according to the stage of treatment and is immersed in the coolant tank 12. A following means 50 for following the line 40 is provided.

The following means 50 passes through the intermediate space 30 and causes the temperature measuring lines 40 to reach the first processing chamber 10, the second processing chamber 20, and the coolant tank 12, respectively, so that the temperature measuring lines 40 are connected to the temperature measuring lines 40. Feed and feed. In this example, the following means 50 includes moving reels 51A and 51B and a reel case 52. In this example, the temperature measuring lines 40 are alternately hung on the two moving reels 51A and 51B. The tip side of the temperature measuring line 40 is passed through the intermediate space 30 through an insertion hole 53 formed in the wall surface of the intermediate space 30. The root side of the temperature measuring wire 40 passes through a seal hole 54 provided in the reel case 52 and is connected to a measuring instrument (not shown) as described above. The temperature measuring wire 40 is inserted through the seal hole 54 while maintaining airtightness by the seal member. As a result, the inside of the reel case 52 has the same airtightness as the intermediate space 30.

When the temperature measuring line 40 is extended, the distance between the two moving reels 51A and 51B becomes narrow, and conversely, when the temperature measuring line 40 is extended, the two moving reels 51A and 51B are extended. The distance between them becomes wider. As a result, the temperature measuring line 40 is made to follow the work 1 moving through the first processing chamber 10, the second processing chamber 20, and the coolant tank 12. At this time, since the temperature measuring line 40 is extended and extended, the temperature measuring line 40 does not become loose or insufficient and the work 1 cannot be moved to a predetermined place.

〔motion〕
2 to 4 are views for explaining the usage state of the vacuum furnace.

FIG. 2A shows a state before the work 1 is charged into the furnace. The outer door 11 and the first airtight door 15 are open, and the second airtight door 25 and the heat insulating door 35 are closed. The work 1 is outside the outer door 11, and the tip of the temperature measuring wire 40 is fixed to the work 1. That is, the temperature measuring line 40 passes through the intermediate space 30 and the first processing chamber 10 and extends to the outside of the outer opening 11A at the tip.

FIG. 2B shows a state in which the work 1 is charged in the first processing chamber 10. The outer door 11 is closed, the first airtight door 15 is open, and the second airtight door 25 and the heat insulating door 35 are closed. The work 1 is placed on the elevating table 13. The temperature measuring line 40 passes through the intermediate space 30 and is advanced to the inside of the first processing chamber 10. In this state, the first vacuum pump 9 is operated to reduce the pressure in the first processing chamber 10 and the intermediate space 30. Further, the second vacuum pump 21 is operated to reduce the pressure in the second processing chamber 20. At this time, the pressure in the first processing chamber 10 and the pressure in the second processing chamber 20 are kept equal. By doing so, the first airtight door 15 and the second airtight door 25 can be smoothly opened and closed.

FIG. 2C shows a state in which the work 1 is moved from the first processing chamber 10 to the second processing chamber 20. The outer door 11 is closed, and the first airtight door 15, the second airtight door 25, and the heat insulating door 35 are open. The work 1 is placed on the work table 22. The temperature measuring line 40 passes through the intermediate space 30 and follows until the tip reaches the inside of the second processing chamber 20.
The means for moving the work 1 in the furnace is not shown. For example, a means such as incorporating a fork extending toward the first processing chamber 10 in the work table 22 can be used.

FIG. 3A shows a state in which the work 1 is heated in the second processing chamber 20. The outer door 11 and the first airtight door 15 are closed, the second airtight door 25 is open, and the heat insulating door 35 is closed. The tip of the temperature measuring line 40 passes through the intermediate space 30 and reaches the inside of the second processing chamber 20. At this time, the temperature measuring line 40 passes through the gap of the closed heat insulating door 35. The operation of the second vacuum pump 21 is continued, and the work 1 is heated in a state where the inside of the second processing chamber 20 is depressurized. Nitrogen gas is introduced into the first processing chamber 10 from a gas introduction path (not shown), and a differential pressure is applied between the first processing chamber 10 and the second processing chamber 20.

FIG. 3B shows a state in which the work 1 is moved from the second processing chamber 20 to the first processing chamber 10. The outer door 11 is closed, and the first airtight door 15, the second airtight door 25, and the heat insulating door 35 are open. Before opening and closing the first airtight door 15 and the second airtight door 25, the pressure in the first processing chamber 10 and the second processing chamber 20 is increased by the operation of the first vacuum pump 9 and the second vacuum pump 21. Are evenly arranged. The work 1 is placed on the elevating table 13. The temperature measuring line 40 passes through the intermediate space 30 and follows so that the tip reaches the inside of the first processing chamber 10.

FIG. 3C shows a state in which the work 1 is immersed in the coolant tank 12. The outer door 11 is closed, the first airtight door 15 is open, and the second airtight door 25 and the heat insulating door 35 are closed. The lift 13 descends from the first processing chamber 10 to the coolant tank 12. The temperature measuring line 40 passes through the intermediate space 30 and the first processing chamber 10 and extends to the coolant tank 12 at the tip.

FIG. 4A shows a state in which the work 1 is pulled up from the coolant tank 12 to the first processing chamber 10. The outer door 11 is closed, the first airtight door 15 is open, and the second airtight door 25 and the heat insulating door 35 are closed. The work 1 is placed on the elevating table 13. The temperature measuring line 40 is lowered so as to pass through the intermediate space 30 and reach the inside of the first processing chamber 10.

FIG. 4B shows a state in which the work 1 is carried out of the furnace. The outer door 11 and the first airtight door 15 are open, and the second airtight door 25 and the heat insulating door 35 are closed. The temperature measuring line 40 passes through the intermediate space 30 and the first processing chamber 10 and extends to the outside of the outer opening 11A at the tip.

[Effect of this embodiment]
By adopting the above configuration, the vacuum furnace of the present embodiment has the following effects.

The present embodiment includes a first processing chamber 10, a second processing chamber 20, an intermediate space 30, a temperature measuring line 40, a first airtight door 15, and a second airtight door 25. The first processing chamber 10 is for processing the work 1. The second processing chamber 20 has an airtightness capable of processing the work 1 in a reduced pressure environment. The intermediate space 30 is provided between the first processing chamber 10 and the second processing chamber 20, and has the same airtightness as the second processing chamber 20. The temperature measuring line 40 can reach the first processing chamber 10 and the second processing chamber 20, respectively, through the intermediate space 30. The temperature measuring line 40 measures the temperature of the work 1 existing in the first processing chamber 10 or the second processing chamber 20 according to the stage of processing. The first airtight door 15 can airtightly separate the first processing chamber 10 and the intermediate space 30. The second airtight door 25 can airtightly separate the intermediate space 30 and the second processing chamber 20.

When the work 1 is present in the first processing chamber 10, the temperature of the work 1 is measured by a temperature measuring line 40 that has passed through the intermediate space 30 and reached the first processing chamber 10. When the work 1 is present in the second processing chamber 20, the temperature of the work 1 is measured by the temperature measuring line 40 that has passed through the intermediate space 30 and reached the second processing chamber 20. In such a temperature measuring operation, when the second processing chamber 20 is set to a reduced pressure environment and the work 1 existing in the first processing chamber 10 is measured, the first airtight door 15 is opened. The first processing chamber 10 and the intermediate space 30 are communicated with each other, and the second airtight door 25 is closed to airtightly separate the intermediate space 30 and the second processing chamber 20. As a result, the temperature of the work 1 existing in the first processing chamber 10 can be measured while keeping the second processing chamber 20 in the depressurized state. When measuring the temperature of the work 1 existing in the second processing chamber 20, the second airtight door 25 is opened to allow the second processing chamber 20 and the intermediate space 30 to communicate with each other, and the first The airtight door 15 is closed to airtightly separate the intermediate space 30 from the first processing chamber 10. As a result, the temperature of the work 1 existing in the second processing chamber 20 can be measured while keeping the second processing chamber 20 and the intermediate space 30 in a reduced pressure state.
In this way, in a vacuum furnace in which the work 1 carried into the furnace is heat-treated in the plurality of processing chambers 10 and 20, the temperature of the work 1 in the plurality of processing chambers 10 and 20 can be actually measured.

In the present embodiment, the first processing chamber 10 includes a coolant tank 12. The temperature measuring line 40 can reach the coolant tank 12. The work 1 existing in the coolant tank 12 is configured to be able to measure the temperature.
As described above, the first airtight door 15 is opened to communicate the first processing chamber 10 with the intermediate space 30, and the second airtight door 25 is closed to close the intermediate space 30 and the first. The processing chamber 20 of 2 is airtightly separated. Further, the temperature measuring line 40 is brought to reach the coolant tank 12 to measure the temperature of the work 1 existing in the coolant tank 12. As a result, the temperature of the work 1 existing in the coolant tank 12 can be measured while keeping the second processing chamber 20 in the depressurized state.

In the present embodiment, the following means 50 for making the temperature measuring line 40 follow the work 1 moving between the first processing chamber 10 and the second processing chamber 20 according to the processing stage. Further prepare.
Since the temperature measuring line 40 follows the work 1 moving between the first processing chamber 10 and the second processing chamber 20, the first processing chamber 20 is kept in a decompressed state. The temperature of the work 1 existing in the processing chamber 10 or the second processing chamber 20 can be measured.

This embodiment is configured so that the temperature of the work 1 can be measured without interruption while maintaining the airtightness of the processing chambers 10 and 20 in which the work 1 is present according to the stage of the treatment.
Therefore, the temperature of the work 1 can be measured and monitored without interruption according to the processing stage.

[Modification example]
Although the above has described particularly preferable embodiments of the present invention, the present invention is not limited to the embodiments shown, and can be modified into various embodiments, and the present invention includes various modified examples. The purpose is to do.

1: Work 9: First vacuum pump 10: First processing chamber 11: Outer door 11A: Outer opening 12: Coolant tank 13: Lifting platform 14: First partition 14A: First opening 15: First airtight door 15A: 1st door pocket space 20: 2nd processing chamber 21: 2nd vacuum pump 22: Work table 23: Insulation wall 23A: 3rd opening 24: 2nd partition wall 24A: 2nd opening 25: 2nd airtight door 25A : 2nd door pocket space 30: Intermediate space 35: Insulated door 35A: 3rd door pocket space 40: Temperature measuring line 50: Following means 51A: Moving reel 51B: Moving reel 52: Reel case 53: Insertion hole 54: Seal hole

Claims (3)

A first processing room for processing workpieces,
A second processing chamber having airtightness capable of processing the work in a reduced pressure environment, and
An intermediate space provided between the first processing chamber and the second processing chamber and having the same airtightness as the second processing chamber,
The work that can reach the first processing chamber and the second processing chamber through the intermediate space and is present in the first processing chamber or the second processing chamber depending on the stage of processing. With a temperature measuring line that can measure the temperature
A first airtight door that can airtightly separate the first processing chamber from the intermediate space,
A second airtight door that can airtightly separate the intermediate space from the second processing chamber ,
A tracking means for tracking the temperature measuring line with respect to the work moving between the first processing chamber and the second processing chamber according to the processing stage is provided .
The above-mentioned following means
It has a reel and a reel case for feeding and feeding the temperature measuring wire, and the tip side of the temperature measuring wire is passed through the intermediate space by inserting an insertion hole formed in the wall surface of the intermediate space. A vacuum characterized in that the inside of the reel case is configured to maintain the same airtightness as the intermediate space by passing the root side of the temperature measuring wire through a seal hole that maintains the airtightness. Furnace. The first processing chamber is equipped with a coolant tank.
The vacuum furnace according to claim 1, wherein the temperature measuring line can reach the coolant tank and can measure the temperature of the work existing in the coolant tank. The vacuum furnace according to claim 1 or 2, which is configured so that the temperature of the work can be measured without interruption while maintaining the airtightness of the processing chamber in which the work is present according to the stage of processing.

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