JPS59128224A - Manufacture of glass ball for bulb - Google Patents

Abstract

PURPOSE:To obtain a titled glass ball having a connecting part with a high mechanical strength by heating connection end faces of the glass ball and an exhaust pipe, varying the exhaust pipe by the height of a rail in accordance with the heating condition of the contacting surfaces, and connecting efficiently the glass ball with the exhaust pipe. CONSTITUTION:An exhaust pipe 1 and a glass ball 2 are held respectively by a holder 13 and a holder 15. The exhaust pipe shaft and the glass ball shaft are attached to a rotation driving table 5 and positioned on the Y-Y' axis by a control bar 8 provided to the main body 6 of the holder 15. On the other hand, a main body 9 to which the holder 13 is set up is driven up and down in accordance with the height of a rail 10 provided to the main body of a device 3 through a roll 11 provided at the bottom of the main body 9. Thus, the pipe 1 is driven up and down according to the extent of variation of the height of the rail 10. In this way, reboiling does not occur due to the reheating of the pipe 1 and the ball 2, and a glass ball for a bulb can be obtd., which has a uniform connecting part in shape and wall thickness distribution.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method of manufacturing a glass bulb for a tube.

Conventional configuration and its problems - E. When connecting a glass bulb and an exhaust pipe, the end faces of the glass bulb and the exhaust pipe to be connected are heated in a state where they are separated, and the end faces reach a molten state. When this happens, the two are brought together and connected. In the above connection method, the end faces to be connected are baked and the inner diameter is reduced due to internal bulging, and the exhaust pipe and the glass bulb are brought into contact with each other, so that an internal bulging occurs in the connection portion and the inner diameter becomes smaller. As a result, it is difficult to remove strain from connections where internal warpage has occurred, and cracks may occur due to reheating near the connections, and residual strain may become thicker, resulting in glass bulbs with a high risk of breakage. In addition, a small inner diameter reduces exhaust efficiency.To prevent this, reheating is performed to correct the inner diameter and small diameter, and pressure is applied from the inner surface of the glass bulb with compressed air to remove the inner diameter. The inside of the glass bulb is often contaminated due to the use of 75 mm compressed air and the extended processing time. In addition, when connecting a glass bulb and an exhaust pipe engineer, if the end faces of the glass bulb and exhaust pipe to be connected are separated and the end faces are heated with heated charcoal, the edge portion of the end will be heated by conduction. Since diffusion is small and a heat accumulation phenomenon occurs, the temperature rises more rapidly than the portions other than the edge portions of the end face. This rapid temperature rise at the edge of the end face is caused by 5i02. When aluminoboro7silicate glass containing Al2O3 as the main component is used, a reboiling phenomenon peculiar to the glass is induced,
This causes defects such as loss of airtightness, reduced mechanical strength, and reduced commercial value due to clouding of processed parts.

In order to avoid such a rapid temperature rise at the edge of the end face and to prevent the occurrence of re-boiling, it is necessary to use heated coal at a lower temperature, resulting in a long work time and reduced efficiency.

OBJECTS OF THE INVENTION The present invention provides a method for manufacturing a glass bulb for a tube, which eliminates the above-mentioned conventional drawbacks and allows efficient connection of the glass bulb and the exhaust pipe.

Structure of the Invention The present invention provides a method for heating the abutted contact surfaces in a state in which the end surfaces of the glass bulb and the exhaust pipe are brought into contact with each other by abutting, and heating the abutted contact surfaces in accordance with the heating state of the abutted contact surfaces. By making the exhaust pipe variable depending on the height of the rail, the exhaust pipe can be connected to the glass bulb, and the exhaust pipe can be easily inserted during the bulb exhaust process, creating a connection with high mechanical strength. This is what I did.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, the exhaust pipe 1 is held by a holder 13, the glass bulb 2 is held by a holder 15, and the exhaust pipe axis and the crow axis are provided in the main body 6 of the holder 15 attached to the rotary drive table 5. It is positioned on the Y7/axis by the regulating rod 8. The main body 9 to which the holder 13 of the exhaust pipe 1 is attached is uni-driven via a roller 11 provided at the lower end of the main body 9 according to the height of the rail 10 provided on the device main body 3. Ru.

Therefore, the exhaust pipe 1 is moved up and down according to the amount of change in the height of the rail 10.

In FIG. 1, 4 is a bearing, 7 is a mounting bolt, and 12 and 14 are single shafts that rotate the holder 13 degrees and 150 degrees, respectively.

Next, the method of the present invention using such an apparatus will be explained.

In FIG. 2, a regulating plate (not shown) with a thickness t is provided on the reference line X-X' at a, and the glass bulb 2 and exhaust pipe 1 held in a holder are The exhaust pipe 1 is regulated at a spacing t. At this time, the end surface to which the glass bulb 2 is connected is located on the reference line x-x', and the end surface to which the exhaust pipe 1 is connected is located on the reference line x-x'.
' is positioned at a distance t from The rail at a is set at a height k above the x-x' field surface of the main body 3 of the apparatus.

While the drive table is rotating from a to b, the height of the rail is t.
Since the height is set low, exhaust pipe 1 is set at the reference line x.
-x'4, and is brought into contact with the connected end surface of the glass bulb 2 located at the reference line xx'. At b, the glass bulb 2 and the exhaust pipe 1 are brought into contact with each other, and the contacting end surfaces are heated with heated charcoal. While the drive table is rotating from b to c, the rail descends and the exhaust pipe 1 descends and is pressed against the glass bulb 2, the gap between the end faces disappears, and the outer diameter of the contact surface changes according to the pressure. It becomes larger, and heat conduction between the two becomes possible, so that the temperature of the heated part becomes equal. The temperature of the heated coal in C is higher than the temperature of the heated coal in b. While the drive table is rotating from C to d, the rail further descends and the exhaust pipe 1 is pressed against the glass bulb 2, and the outer diameter of the connecting surface increases by the amount of pressure.At the same time, the outer periphery of the connecting surface becomes The exhaust pipe 1 is heated so that the outer diameter of the connection part, which has increased at d, becomes the outer diameter before heating at 8. During the rotational transition of the drive table from d to e, the exhaust pipe 1 is connected to the rail. The rail is further lowered and pressed against the glass bulb 2. At this point, the connection surface is airtightly connected almost to the inside of the connection surface. While the drive table is rotating from e to f, the rail is lowered and the outer diameter of the connection surface is increased. At f, the heating power of the heated charcoal is increased to bring the glass bulb 2 and the exhaust pipe 1 together.At this time, the outer diameter of the connecting surface is not smaller than the outer diameter before heating at a, and the next q -1. During the transition from f to q-1, the shape of the connection part is heated at a temperature that increases the outer diameter of the connection surface as shown in g -1. In g-2, the inner diameter of the connection part is The temperature is maintained at such a temperature that the connection part is stretched at 1.0 to 1.6 times the temperature before heating processing.g
-2 and q-3 are driven up and down, and q-
When the rotary table moves from 1 to q-3, the rail descends to the height of q-2, and when it moves from q-3 to the next process, the rail of q-2 moves to the position shown in q-3. It rises to the height k of the rail at the slack a and returns. As the exhaust pipe 1 is pulled up by the vertical movement of the rail, the connecting portion is stretched as shown in FIG. 4, and a sealed portion of the exhaust pipe 1 is formed. The simplicity of the rail in the steps from q-3 onwards is maintained at a height of k, and it is slowly cooled using heating coal for strain removal.

As described above, by changing the height of the rail according to the heating state, the present invention makes it possible to obtain a connecting part with a uniform external shape and uniform wall thickness distribution, and at the same time, to connect the exhaust pipe 1 and the glass bulb. By bringing them into contact by abutting the two, a state is formed in which sufficient heat conduction occurs between the two, and a rapid temperature rise at the edge of the connected end face is suppressed. Re-boiling is unlikely to occur during the connection process of glass bulbs 1 and 2.

Furthermore, there is no need to use compressed air, and since the exhaust pipe 1 and the glass bulb 2 are heated with a heating flame after they are brought into contact, the heating flame does not enter inside the exhaust pipe 1 and the glass bulb 2. Since there is no internal contamination, cleaning and other treatments are not required.

Next, the present invention will be explained in detail.

Using an exhaust pipe 1 made of aluminoborosilicate glass with an outer diameter of 4 mm and a wall thickness of 0.8 mm, as shown in FIG. As a result of the connection, the connection is made as shown in Fig. 4, and the inner diameter of the connection part of the glass bulb 2 with the exhaust pipe 1 is 1.3"-1.5mm + wall thickness 0.82~○
, s'7mm, good external dimensions were obtained without causing re-boiling, and processing such as cleaning after connection was omitted.
A prototype 12V 30/30W halogen light bulb was manufactured and tested, and it was found to have the same performance as a halogen light bulb using a cleaned glass bulb.

Note that the exhaust pipe and the glass bulb may be connected in a reverse position as in the above embodiment.

The movable side of the exhaust pipe and glass bulb can be either the exhaust pipe or the glass bulb.

Further, although the embodiment shown in FIG. 1 is one in which the exhaust pipe and the glass bulb are held vertically, the result of my colleague can be obtained even if they are held horizontally and connected.

DETAILED DESCRIPTION OF THE INVENTION As described in the detailed description of the invention, the present invention does not cause reboiling, and
It is possible to provide a method of manufacturing a glass bulb for a bulb, which allows a glass bulb for a bulb to have a connection portion having a uniform shape and thickness distribution.

[Brief explanation of the drawing]

Fig. 1 is a schematic configuration diagram showing an example of an apparatus for carrying out the method of the present invention, Fig. 2 is a process diagram showing an embodiment of the method of the present invention, and Fig. 3 is a schematic diagram showing an example of an apparatus for carrying out the method of the present invention. FIG. 4 is a sectional view showing an example of a glass bulb for a tube obtained by the method of the present invention. 1...Exhaust pipe, 2...Glass bulb, 3...
...Device body, 5...Rotary drive table knife 6
...Main body, 8...Adjustment rod, 9...
...Main body, 10...Rail, 11...Roller, 13...Holder, 15...Holder O Description of agent Patent attorney Satoshi Nakao and 1 other person First name
1 (branch) Y taste
Coe ground 3
Figure 4

Claims (1)

[Claims] The abutting contact portion is heated in a state where the end surfaces connecting the glass bulb and the exhaust pipe are brought into contact by abutment, and the height of the exhaust pipe or the glass bulb is varied according to the heating state by changing the height of the rail. A method for manufacturing a glass bulb for a tube, characterized in that the exhaust pipe is connected to the glass bulb by.