JPH0828185B2 - Method for manufacturing metal vapor discharge lamp - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a metal vapor discharge lamp, and more particularly to a method for stably molding a heat-softened outer tube / stem sealing portion. .

[Prior Art] FIG. 4 shows a conventional method for manufacturing such a metal vapor discharge lamp. That is, as shown in the figure, the sealing head (10
After setting the stem (2), in which the outer tube (1) and the arc tube are assembled to the outer tube (0), the sealing head (100) is rotated as a unit, and then the outer tube (1) is rotated as shown in FIG. ) The neck part (109) is softened by heating the vicinity of the sealed part (109a) around the part with a burner (108) that burns a mixed gas of city gas and oxygen. Contract. At that time, the carret part (110) receives the carret (107).
Received on the upper surface of the neck, and the neck part (109)
When the portion to be sealed (109a) is sealed with the outer peripheral portion (2a) of the flare of the stem (2) over the entire circumference, the burner (10
8) Stop heating. Next, using a pair of half-moon shaped ring burners, the flare outer peripheral portion (2
It melts near the bottom of a).

Then, for example, as shown in Fig. 3, the planned sealing part (109a)
And the die adhered part (109c) above it are heated by the movable burner (108), and when this part reaches the proper temperature for mold processing, a mold (111) is used for the part as shown in FIG. For example, a forming part (3) such as a screw is formed.

[Problems to be solved by the invention]

As described above, when the die (111) is entered, the die adhered part (1
If the shape of 09c) is as shown in Fig. 5, for example, the upper end part (111a) of the screw forming part of the mold (111) of Fig. 6 hits the upper part (109d) of the base part (109c). However, there was a problem that the predetermined screw forming was not performed completely, and thus the die (not shown) was not fitted correctly. The present invention has been made to solve such a problem, and an object of the present invention is to make it possible to easily and completely form, for example, a screw by a die by controlling the temperature of the die adhered portion (109c). To do.

[Means for solving problems]

In the method for manufacturing a metal vapor discharge lamp according to the present invention, the base adhered portion (109c) is heated by the movable burner (108) to the proper mold machining temperature. At that time, the movable burner (108) is The inside of the outer tube (1) is sucked only while the molding portion (109e) of the screw and the like at the upper portion of the die adhered portion (109c) by (111) is heated.

[Work]

In the method of the present invention, the movable burner sucks the inside of the outer tube (1) only when it heats the screw-formed portion of the die above the die adhered portion, so that only the screw-formed portion of the movable burner is heated. The projecting force by the flame and the effect of air intake from the outer tube cause it to contract in the radial direction, so that when it is put in the mold, it does not collide with anything, so that, for example, the desired screw etc. can be formed easily and completely. Will be seen.

〔Example〕

An embodiment of the present invention will be described below. That is, in FIG. 1, FIG. 2 and FIG. 3, the same parts as those of the conventional one are designated by the same reference numerals and their duplicate description will be omitted.
It is a 0W mercury lamp, the neck (109) of the outer tube (1) has an inner diameter of 50 mm, and the outer flare (2a) of the flare of the stem (2) has an outer diameter of 3
2mm, base part (109c) length 13mm, movable burner (10
8) is designed to move up and down 25 mm from the bottom of the stem 5 times at a speed of 8 mm / sec.

By the way, Movable burner (108)
As shown in FIG. 7, when the upper tube is heated up and down to a proper temperature for machining by the die, the outer tube (1) is continuously inhaled through the chip tube (103) and the mount shaft air intake hole (112). Since the flame output of the movable burner (108) and the effect of intake from the outer pipe (1) cause a problem that a part of the neck portion (109) comes into contact with the wall surface of the stem (2), Particularly in the case of the present invention, the movable burner (108) sucks air into the outer tube (1) only while the molded portion (109e) such as a screw on the upper portion of the mouthpiece adhered portion (109c) is heated. Is.

As a result, as shown in Fig. 1, due to the effect of the projecting force of the flame of the movable burner (108) and the intermittent intake of air from the inside of the outer tube (1), only the thread forming part (109e) contracts in the radial direction. When the portion is put into the mold, it does not hit anywhere, and molding of the portion, such as a screw, is easily and completely performed.

In order to confirm the above results, (I) a lamp that does not draw air into the outer tube at all, (II) a lamp that keeps drawing air while heating the movable burner, and (III) move the inside of the outer tube only while the screw burner is heated by the movable burner. 3 types of inhaled lamps, 10 for each
The results of experiments on 0 lamps show that the defective rate of the lamp is 17% in the case of (I), 8% in the case of (II), and 0% in the case of (III), and the effect of the present invention is particularly remarkable. It was confirmed.

In the above-mentioned embodiment, the case where the mold used is for screw molding has been described, but it goes without saying that the mold is not necessarily limited to screw molding.

〔The invention's effect〕

In the manufacturing method of the present invention, as described above, when the die-covered portion (109c) is heated by the movable burner (108) to an appropriate temperature for the die machining, the movable burner moves above the die-coated portion (109c). By inhaling the inside of the outer tube only while heating the forming part (109e) of the screw, for example, only the part where the screw is formed contracts in the radial direction due to the blast output from the flame of the movable burner and the effect of the intake from the outer tube. Therefore, when the portion is put into the mold, it does not hit anywhere, and therefore, the desired screw or the like can be easily and completely formed.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part for explaining an embodiment of a method for manufacturing a metal vapor discharge lamp of the present invention, and FIGS. 2, 3, and 4 are general sectional views including the case of the present invention. FIG. 5 is an explanatory view of the outer tube sealing operation, FIG. 5 is a cross-sectional view of a main part for explaining the operation in the conventional case, FIG. 6 is a cross-sectional view of a mold used, and FIG.
The figure is a cross-sectional view of a main part for explaining the operation in the conventional manufacturing method. In the figure, (1) is an outer tube, (2) is a stem, (2a) is a flare outer peripheral portion, (108) is a burner, (109c) is a base to which a die is attached, (109e) is a molded portion such as a screw, (111) ) Is a mold. In other figures, the same reference numerals indicate the same parts.

Claims (1)

[Claims] 1. A step of heat-softening and shrinking a portion of an outer tube near a predetermined sealing portion with a movable burner to weld the outer tube and an outer peripheral portion of a flare of a stem placed inside the predetermined sealing portion, and In the one including a step of molding the sealed portion which is heat-softened in the step by using a mold, the above-mentioned method is used only when heating the molded portion such as the upper screw of the die adhered portion where the movable burner is softened. A method for manufacturing a metal vapor discharge lamp, which comprises inhaling the inside of an outer tube.