JPS6118360B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for manufacturing an airtight terminal, in particular, a method for manufacturing an airtight terminal, in which a metal ring and a lead terminal are assembled during powder glass molding, and assembly into a jig for sealing is simplified. This relates to a manufacturing method.

A typical conventional manufacturing method for airtight terminals is to powder-form granulated glass granules, then pre-sinter them to obtain a glass tablet 1, which is then combined with a metal ring 4 and a lead that have been appropriately heat-treated in advance. The terminal 5 was assembled into the sealing jig 2 and heated at a high temperature to obtain an airtight terminal (FIG. 1(a)).

In this method, the molding mechanism is simple because the glass granules are molded independently, but on the other hand, the molded product is handled as it is, which can easily cause chips to occur in the molded product, which is a factor in reducing yield. was. In addition, the work of assembling the glass tablet, metal ring, and lead terminal into the jig for sealing is the part that requires the most procurement in the airtight terminal manufacturing process, and has been a major obstacle to manufacturing inexpensive airtight terminals. .

In addition, in an airtight terminal using a container-shaped metal ring, if the melting order of the glass is not appropriate,
As shown in (b), there were drawbacks such as the inclusion of air bubbles 3 in the bottom of the vessel, reducing the contact area between the metal ring and the glass.

An object of the present invention is to eliminate the above-mentioned disadvantages and provide a more inexpensive airtight terminal.

An embodiment of the present invention will be described below based on the accompanying drawings.

FIG. 2 shows an embodiment of the invention.

The metal ring 11 and the lead terminal 18 are supplied into the die 15 of the molding machine and the lower punch 12 in advance.

The glass granules 13 flow through the feeder 14 into the hole 16 of the die 15 where the metal ring 11 is present (FIG. 2(a)).

Next, after the lead terminal 18 is raised by a certain amount from the lower punch 12 (not shown), the upper punch 17 located above the hole 16 is lowered, and the glass granules 13 in the die 15 are press-formed. (Figure 2(b)).

When the molding is completed, the upper punch 17 attracts the lead terminal 18 and pulls it up by a certain amount together with the metal ring 11 fixed via the glass molded body 13. Thereafter, the two cutters 10 provided on the die 15 work together to pinch and cut the lower end of the lead terminal 18 from both sides (FIG. 2(c)).

The upper punch 17 releases the lead terminal 18, rises to a predetermined position, and stops. Lead terminal 18 and metal ring 11 fixed via glass molded body 13
is assembled into a sealing jig in this state and prepared to be heated at a high temperature.

In this embodiment, the lead terminals 18 are automatically supplied from the lower part of the lower punch 12.

Further, the lead terminal 18 and the metal ring 11 are used which have been subjected to appropriate surface treatment in advance if necessary.

For the sealing process, a tunnel type non-oxidizing atmosphere furnace (Fig. 4), which can be programmed as shown in the temperature distribution (Fig. 3), is used.

The sealing jig is heated in a temperature range of 300°C to 400°C for 15 minutes or more to sufficiently vaporize the binder used for glass granulation, and then placed on a belt conveyor and inserted into the sealing heating zone.

As described above, according to the present invention, the firing process of the glass tablet can be omitted, and the assembly of the glass tablet, lead terminal, and metal ring into the sealing jig, which is the most necessary to obtain, is simplified. This makes it possible to provide inexpensive airtight terminals. In terms of quality, since the glass granules are uniformly fixed on the inner surface of the metal ring in advance, it is possible to prevent the glass tablet 1 from enclosing the air bubbles 3 as seen in FIG. 1(b).

[Brief explanation of the drawing]

FIG. 1(a) is an assembled sectional view showing a typical conventional airtight terminal before being sealed, and FIG. 1(b) is a vertical sectional view showing an airtight terminal with bubbles sealed. FIGS. 2(a), (b), and (c) are longitudinal sectional views showing the molding process of an embodiment of the present invention, and FIG. 3 is a diagram showing an example of a heating temperature and time program for sealing treatment. 4 are longitudinal sectional views showing an example of a tunnel type non-oxidizing atmosphere furnace. 11...Metal ring, 12...Lower punch, 13...Glass granules, 14...Feeder, 15...Die, 16...Die hole, 17...Upper punch, 18...Lead terminal, 19
...Upper punch hole, 10...Cutter.

Claims (1)

[Claims] 1. A method for manufacturing an airtight terminal in which a metal ring and at least one lead terminal are insulated and sealed with glass, in which glass powder is poured into a hole in the metal ring, and a lead terminal is placed in the center. After supplying, the glass powder is press-molded and the metal ring and the lead terminal are temporarily fixed at the same time, and then the lead terminal and the lead terminal that are temporarily fixed via the glass molded body formed by the pressure-forming are A method for manufacturing an airtight terminal, characterized by heat-sealing a metal ring. 2. The method of manufacturing an airtight terminal according to claim 1, wherein a portion of the metal ring hole is tapered.