JPH04243941A - Production of glass-sealed product - Google Patents

Abstract

PURPOSE:To provide the subject production method preventing the breakage of the edges of a glass piece not to produce broken pieces on the production of the glass-sealed produce employing the cut glass piece. CONSTITUTION:A glass piece cut out from a glass ingot is preliminarily heated to melt the surface layer of the glass piece and is formed into a glass piece 3h having curved peripheral edges 3g while maintaining the shape thereof. The curved glass piece 3h is received in a metal outer ring and subsequently heated and sealed in a tight state.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a glass sealed body in which glass is hermetically heated and sealed to a metal outer ring.

0002

2. Description of the Related Art An example of a glass sealed body is an airtight terminal-shaped monitoring window (1) shown in FIG. The above-mentioned monitoring window (1) is made by heating and sealing transparent glass (3) airtightly to the through-hole part of a metal outer ring (2). After storing it in the seating part of the window hole (4a) formed in (4) via the packing (5), the mounting piece (4b) is bent and fixed. And glass (3
) to monitor the refrigerant, etc. in the radiator.

[0003] When manufacturing the above-mentioned monitoring window (1),
As shown in FIG. 4, a round bar-shaped glass ingot (3a) is cut to cut out a disc-shaped glass piece (3b) to a fixed size. Next, as shown in FIG. 5, the metal outer ring (2
) and insert the glass piece (3b) into the through hole (2a).
After storing the glass, place the sealing jig (6) for about 1 hour to melt the glass.
Heat to 000°C and attach glass (3) to metal outer ring (2).
hermetically seal.

[0004] In addition, as a monitoring window, there are other monitoring windows shown in FIGS. 7 and 8.
There is also a monitoring window (7) shown in FIG. The monitoring window (7) is made by heating and sealing glass (3) airtight to a metal outer ring (8) provided with an O-ring groove (8a) and a bolt insertion hole (8b). It is used for monitoring oil in indoor boilers, etc., and is larger than the monitoring window (1). Therefore, when manufacturing it, as shown in FIG. 9, a thick plate glass ingot (3c) is cut into a circular shape using a diamond saw, a disk-shaped glass piece (3d) is cut out, and a metal outer ring (8) is cut out in the same manner. hermetically sealed.

[0005]

[Problem to be Solved by the Invention] The problem to be solved is that when glass pieces (3b) (3d) are cut out from glass ingots (3a) (3c) in the production of monitoring windows (1) and (7), As shown in , there are sharp corners (3e
) occurs. Therefore, the corner part (3e) is easily chipped during transportation or supply to the sealing jig (6), and as shown in Figure 6, the chipped pieces (3f) fall into the jig and seal the metal outer ring (2). Easy to adhere to the underside of. Removal of this adhered glass is difficult;
If the adhesive is shipped as it is, it will interfere with the packing (5) during attachment to the attachment body (4). Therefore, it became impossible to ensure the liquid-tight condition, and the monitoring window (1
) is the point at which the product becomes defective. The same applies to the monitoring window (7).

[0006]

[Means for Solving the Problems] The present invention includes the steps of cutting out a plate glass piece from a glass ingot, and preheating the glass piece to melt the surface layer and curve only the peripheral corners. and a step of storing the preheated glass pieces in a metal outer ring and heating and sealing them airtight, and the temperature for the preheating is 600 degrees Celsius to 700 degrees Celsius. It is characterized by

[0007]

According to the above-mentioned technical means, a disk-shaped glass piece cut out from a glass ingot is preheated to curve its peripheral corner, and then heated and sealed airtight to a metal outer ring.

[0008]

[Example] Fig. 1 shows an example in which the method for manufacturing a glass sealed body according to the present invention is applied to manufacturing monitoring windows (1) and (7).
This will be explained below with reference to FIGS. 4 and 9. In that case, first, as shown in FIGS. 4 and 9, a disc-shaped glass piece (3b) is produced from a glass ingot (3a) (3c), as in the conventional case.
Cut out (3d). Next, as shown in Fig. 1, the glass pieces (3b) and (3d) are preheated at a temperature of 600°C to 700°C to melt the surface layer, and the corners of the periphery are melted while retaining their shape. (3g) is curved and the glass piece (3g) is curved.
h) to form. After that, the preheated glass piece (3h) is stored in the metal outer ring (2) (8) after being transported and supplied to the sealing jig (6), and heated to about 100°C where the glass melts.
When heated, the glass piece (3h) becomes the metal outer ring (2) (
8) is airtightly sealed to the monitoring window (
1) (7). Then, since the corner portion (3g) of the peripheral edge of the glass piece (3h) is curved, it is less likely to be chipped during transportation or supply to a jig, and no fragments (3f) are generated. According to measurements, the incidence of defective products decreased from 1% to 0.01%.

[0009]

According to the present invention, when manufacturing a glass sealed body by airtightly heating and sealing a disc-shaped glass piece to a metal outer ring, the glass piece is preheated and the corners of its periphery are heated and sealed. Since the surface is curved, the corners are less likely to chip, and glass fragments due to chipping are no longer generated, improving yield and further improving workability.

[Brief explanation of the drawing]

FIG. 1 is a process diagram of essential parts showing an example of a method for manufacturing a glass sealed body according to the present invention.

FIG. 2 is a side sectional view showing a specific example of a glass sealed body.

FIG. 3 is a side sectional view of a radiator mounting body showing an example of use of the glass sealing body.

FIG. 4 is a perspective view of a glass piece cutting process showing an example of a conventional method for manufacturing a glass sealed body.

FIG. 5 is an exploded longitudinal sectional view of a sealing process showing an example of a conventional method for manufacturing a glass sealed body.

FIG. 6 is a side sectional view of a glass sealed body showing a conventional problem.

FIG. 7 is a plan view showing another specific example of the glass sealed body.

8 is a side sectional view of the glass sealed body of FIG. 7. FIG.

9 is a partial plan view of a glass piece cutting process showing a method for manufacturing the glass sealed body of FIG. 7; FIG.

[Explanation of symbols]

2 Metal outer ring 3 Glass 3a, 3c Glass ingot 3g Peripheral corner 3d, 3h Disc-shaped glass piece 8 Metal outer ring

Claims (2)

[Claims] 1. A step of cutting out a plate glass piece from a glass ingot, a step of preheating the glass piece to melt the surface layer and curve only the peripheral corners, and a step of cutting out the glass piece after preheating. 1. A method for manufacturing a glass sealed body, comprising the step of storing the glass in a metal outer ring, heating it, and airtightly sealing it. Claim 2: The temperature related to the preheating is set to 600 degrees Celsius.
2. The method for manufacturing a glass sealed body according to claim 1, wherein the temperature is between 700 degrees and 700 degrees.