JPH11195381A - Heat treatment device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat treatment device to apply a heat treatment at high productivity, made the manufacturing and maintenance cost low, and save the space. SOLUTION: A hot-air device 16 to apply preheating and annealing is disposed on a turn table 32 to correspond to a placement part for a cathode-ray tube 11. Need of putting the hot-air device 16 apart from the cathode-ray tube 11 during rotation of the turn table 32 is thus eliminated, and preheating and annealing can be applied without interruption even during rotation of the turn table 32. Temperature, change of the cathode-ray tube 11 is gentle, the number of the hot-air devices 16 can be less, and move of the hot-air device 6 can be less, thereby life of the hot-air device 16 is elongated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of placing a heat treatment object on a turntable and moving the heat treatment object by rotation of the turntable while preheating the heat treatment object.
The present invention relates to a heat treatment apparatus for sequentially performing heat treatment and slow cooling.

[0002]

2. Description of the Related Art FIG. 3 shows a portion near a neck of a cathode ray tube. When the cathode ray tube 11 is manufactured, the neck glass 12 and the stem glass 14 of the electron gun 13 are welded to each other with the burner device 15 in a state where the electron gun 13 is inserted into the neck glass 12, and the electron gun 13 is placed inside the cathode ray tube 11. To seal.

However, if the neck glass 12 and the stem glass 14 at room temperature are welded immediately by the burner device 15, they are broken, and if the temperature of the welded neck glass 12 and stem glass 14 is immediately lowered to room temperature, distortion remains in these. . Therefore, when the cathode ray tube 11 is manufactured, conventionally, a preheating is performed before welding and a gradual cooling is performed after welding using a hot air device 16 as shown in FIG.

The hot air device 16 is advanced and retracted by a cylinder 17, and as shown in FIG. 4A, in a retracted state, a pair of nozzles 18 are separated from each other. FIG.
As shown in FIG. 4B, in the forward state, the pair of nozzles 18 approach each other, and as shown in FIG.
At 8, warm air 19 is blown around the neck glass 12 around the neck glass 12.

FIG. 5 shows a conventional example of a mass-production sealing device for sealing the electron gun 13 in the cathode ray tube 11. This conventional sealing device 21 includes a turntable 2
2 are provided, and about 10 to 26 mounting portions of the cathode ray tube 11 are provided on the turntable 22. The burner device 15 is disposed outside the turntable 22, and a plurality of hot air devices 16 are disposed outside the turntable 22 and on both sides of the burner device 15.

In order to seal the electron gun 13 in the cathode ray tube 11 with such a sealing device 21, the cathode ray tube 11 with the electron gun 13 inserted in the neck glass 12 is mounted on the turntable 22. The turntable 22 is rotated while being placed on the mounting portion. When the cathode ray tube 11 on the turntable 22 reaches a position facing the hot air device 16 upstream of the burner device 15, the rotation of the turntable 22 is temporarily stopped, and the hot air device 16 is advanced by the cylinder 17.

After blowing hot air 19 around the neck glass 12 for a predetermined time as shown in FIG. 4C, the hot air device 16 is retracted from the cathode ray tube 11 by the cylinder 17, The cathode ray tube 11 is connected to the adjacent hot air device 16.
Rotate the turntable 22 to the position where
Hot air 19 is blown around the neck glass 12 again by the hot air device 16. By blowing the hot air 19 sequentially with the plurality of hot air devices 16 in this manner, the neck glass 1
2 and the stem glass 14 are preheated.

When the preheated neck glass 12 and stem glass 14 are welded together by the burner device 15, the turntable 22 is rotated again.
The neck glass 12 and the stem glass 14 are gradually cooled by sequentially blowing hot air 19 around the neck glass 12 with a plurality of hot air devices 16 downstream of the neck glass 12.

[0009]

However, in the conventional sealing device 21 shown in FIG. 5, since the hot air device 16 is arranged outside the turntable 22, the adjacent hot air device is used. In order to rotate the turntable 22 to a position where the cathode ray tube 11 faces the cathode ray tube 16, it is necessary to temporarily retreat the hot air device 16 from the cathode ray tube 11 with the cylinder 17 and separate it, as described above.

However, when the hot air device 16 is separated from the cathode ray tube 11 in this manner, preheating and slow cooling are interrupted. Therefore, for example, at the time of preheating, as shown in FIG. 2, the temperature 23 on the outer surface of the neck glass 12 temporarily decreases, and the temperature 23 rapidly rises again by the adjacent hot air device 16.

Also, at the time of slow cooling, for some reason,
When the rotation of the turntable 22 is stopped at a position where the cathode ray tube 11 does not exactly face the hot air device 16, the neck glass 12 and the stem glass 14 are not gradually cooled, and the temperature of the neck glass 12 and the stem glass 14 is not increased. Decreases rapidly.

Therefore, in the sealing device 21, there is a possibility that the neck glass 12 and the stem glass 14 may be broken or the distortion may remain. Therefore, the electron gun 13 is necessarily sealed in the cathode ray tube 11 with high productivity. I couldn't stop.

[0013] In response to this, the number of the hot air devices 16 arranged outside the turntable 22 is increased to suppress a rapid change in the temperature 23, or the operating speed of the cylinder 17 is increased to increase the hot air temperature. It is conceivable that the time during which the device 16 is separated from the cathode ray tube 11 is shortened.

However, if the number of the hot air devices 16 is increased, the manufacturing cost of the sealing device 21 is increased and the space cannot be saved by miniaturization.
When the operating speed of the hot air device 16 is increased, the vibration increases.
And the maintenance cost of the sealing device 21 increases. Therefore, an object of the present invention is to provide a heat treatment apparatus that can perform heat treatment on a heat treatment target with high productivity, has low manufacturing costs and maintenance costs, and can also save space by downsizing. I have.

[0015]

In the heat treatment apparatus according to the first aspect, since the heating means for performing preheating and slow cooling is arranged on the turntable corresponding to the mounting portion of the object to be heat treated, When rotating the turntable, it is not necessary to separate the heating means from the object to be heat-treated.

[0016] For this reason, preheating and slow cooling can be performed without interruption even during rotation of the turntable.
Therefore, the temperature change of the object to be heat-treated is gentle, the thermal efficiency is high, the number of heating means to be arranged on the turntable may be small, the movement of the heating means may be small, and the life of the heating means is long.

In addition, the object to be heat-treated can be preheated and gradually cooled without depending on the rotation position of the turntable, and the preheating time and the slow cooling time can be easily controlled. Furthermore,
Since the object to be heat-treated can be gradually cooled even when the turntable is stopped, even if the rotation of the turntable is stopped for some reason, the slow cooling can be completed by time control.

In the heat treatment apparatus according to the second aspect, the temperature change between the neck glass of the cathode ray tube and the stem glass of the electron gun during preheating and gradual cooling is gradual, and cracks in the neck glass of the cathode ray tube and the stem glass of the electron gun can be prevented. The electron gun can be sealed in the cathode ray tube while suppressing distortion.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention applied to a mass production sealing device for sealing an electron gun in a cathode ray tube will be described below with reference to FIGS. The turntable 32 is also provided in the sealing device 31 of the present embodiment, the mounting portion of the cathode ray tube 11 is provided on the turntable 32, and the burner device 15 is arranged outside the turntable 32. I have. However, the hot air device 16
Is a turntable 3 corresponding to the mounting portion of the cathode ray tube 11.
2 are arranged.

In order to seal the electron gun 13 in the cathode ray tube 11 with such a sealing device 31, the cathode ray tube 11 with the electron gun 13 inserted in the neck glass 12 is placed on the turntable 32. Place on the receiver. And cylinder 1
7, the hot air device 16 is advanced to the cathode ray tube 11, and FIG.
As shown in FIG. 3C, the neck glass 1 is
The turntable 32 is rotated while the neck glass 12 and the stem glass 14 are preheated by blowing hot air 19 around the circumference 2.

When the turntable 32 rotates and the cathode ray tube 11 on the turntable 32 moves to just before the position facing the burner device 15, the hot air device 16 is retracted from the cathode ray tube 11 by the cylinder 17. Then, the neck glass 12 and the stem glass 14 are connected to the burner device 15.
Weld with.

When the welding is completed, the hot air device 16 is advanced again to the cathode ray tube 11 by the cylinder 17 and
Then, the turntable 32 is rotated while the neck glass 12 and the stem glass 14 are gradually cooled by blowing hot air 19 around the neck glass 12.

In the sealing device 31 of one embodiment as described above, since the hot air device 16 is disposed on the turntable 32, the hot air device 16 is moved by the cylinder 17 to the cathode ray tube 11 when the turntable 32 rotates. There is no need to keep away from

For this reason, preheating and slow cooling can be applied to the neck glass 12 and the stem glass 14 without interruption even while the turntable 32 is rotating. For example, at the time of preheating, as shown in FIG. Temperature 3
3 rises slowly. As a result, in the sealing device 31, the neck glass 12 and the stem glass 14 are less likely to be cracked or remain deformed.

Further, since the neck glass 12 and the stem glass 14 can be gradually cooled even when the turntable 22 is stopped, the turntable 3 can be cooled for some reason.
Even if the rotation of 2 stops, slow cooling can be completed by time control, and this also
And the stem glass 14 is hardly left with distortion.

The turntable 32 rotates, and the cathode ray tube 11 on the turntable 32 is connected to the burner device 1.
5 can be preheated until it moves to a position immediately before the position facing the burner device 5, and when the welding is completed, it can be gradually cooled immediately after the position facing the burner device 15. That is, preheating and slow cooling of the neck glass 12 and the stem glass 14 can be performed without depending on the rotation position of the turntable 32.

For this reason, the control of the preheating time and the slow cooling time is easy, and the control such as the increase and decrease of the rotation speed of the turntable 32 can be easily performed. Therefore, in the sealing device 31 of the present embodiment, the electron gun 13 can be sealed in the cathode ray tube 11 with high productivity.

Further, since preheating and slow cooling can be applied to the neck glass 12 and the stem glass 14 without interruption even while the turntable 32 is rotating, the heat efficiency is high and the number of the hot air devices 16 to be disposed on the turntable 32 is high. And the forward and backward movement of the warm air device 16 by the cylinder 17 may be small, and the life of the warm air device 16 is long. Therefore, in the sealing device 31 of the present embodiment, the manufacturing cost and the maintenance cost are low, and the space can be saved by downsizing.

In the above embodiment, the invention of the present application is applied to a mass-production sealing device for sealing an electron gun in a cathode ray tube, but an object to be heat-treated is placed on a turntable. The invention of the present application may be applied to heat treatment apparatuses other than the sealing apparatus as long as the heat treatment apparatus sequentially performs preheating, heat treatment, and slow cooling on the heat treatment object while moving the heat treatment object by rotating the turntable. Can be.

[0030]

According to the heat treatment apparatus of the first aspect, the temperature of the object to be heat-treated is gradual, and the slow cooling can be completed by time control even if the rotation of the turntable is stopped. The heat-treated product is hardly damaged. Further, since the control of the preheating time and the slow cooling time is easy, the control of the rotation speed of the turntable and the like are also easy. Therefore, heat treatment can be performed on the heat treatment target with high productivity.

Further, the number of heating means to be disposed on the turntable may be small, and the life of the heating means is long.
Manufacturing costs and maintenance costs are low, and space can be saved by downsizing.

In the heat treatment apparatus according to the second aspect, the electron gun can be sealed in the cathode ray tube while suppressing the breakage of the neck glass of the cathode ray tube and the stem glass of the electron gun.
The electron gun can be sealed in the cathode ray tube with high productivity.

[Brief description of the drawings]

FIG. 1 is a plan view of an embodiment of the present invention.

FIG. 2 is a graph showing a relationship between a preheating time and a temperature on an outer surface of a neck glass according to an embodiment of the present invention and a conventional example.

FIG. 3 is a side sectional view of a main part of a cathode ray tube to which the present invention can be applied.

4A and 4B show a hot air device used in an embodiment of the present invention and a conventional example, wherein FIG. 4A is a plan view in a retracted state, FIG. 4B is a plan view in a forward state, and FIG. () Is an enlarged plan view of a main part in a forward movement state.

FIG. 5 is a plan view of a conventional example of the present invention.

[Explanation of symbols]

11: cathode ray tube (heat treatment object), 12: neck glass,
13: electron gun, 14: stem glass, 16: hot air device (heating means), 31: sealing device (heat treatment device), 32 ...
Turntable

Claims (2)

[Claims] 1. A heat treatment apparatus for placing an object to be heat-treated on a turntable and sequentially performing preheating, heat treatment and slow cooling on the object to be heat-treated while moving the object to be heat-treated by rotation of the turntable, A heat treatment apparatus, wherein heating means for performing the preheating and the gradual cooling is arranged on the turntable corresponding to a mounting portion of the heat treatment target. 2. The method according to claim 1, wherein the object to be heat-treated is a cathode ray tube, and the heat treatment welds a neck glass of the cathode ray tube and a stem glass of an electron gun to seal the electron gun in the cathode ray tube. The heat treatment apparatus according to claim 1, wherein the heat treatment is performed.