JPH0618102B2 - Manufacturing method of fuse with claw - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an improvement in a method for manufacturing a fuse with a claw used for protecting a low voltage lead-in wire.

[Conventional technology]

As is well known, the fuse with a claw includes a fuse base having a heat generating portion and a claw terminal at both ends, sandwiching a central bridge core, and a low melting point alloy portion covering the bridge core portion of the fuse base. This kind of conventional fuse is
After sandwiching the central bridge core and punching out a fuse base with heat generating parts and claw terminals at both ends, a band-shaped low melting point alloy with a specified thickness and dimensions is wound around the bridge core part, and then flux is applied. It was soldered by using the following manufacturing process.

That is, first, the low melting point alloy material is rolled to a predetermined thickness,
After cutting it into a strip shape, punch it to a specified length (Fig. 2B), then bend it into a U shape (Fig. 2B) Combine with a pre-punched fuse base (Fig. 2C), and wind it. (D in the same figure), after press-working to a predetermined thickness (E in the same figure), apply flux to the boundary part of the low melting point alloy part and the heat generating part, put a desired amount of solder on the conveyor It was sent to a tunnel-type electric furnace and soldered at the boundary portion, the contact portion between the bridge core and the low melting point alloy, and both sides of the bridge core.

[Problems to be solved by the invention]

In the conventional manufacturing method, the number of steps is large as described above, and the low melting point alloy material is combined with the fuse base, and the winding process and the soldering work are manually performed one by one, which is extremely difficult. It was inefficient and required strict quality control during production.

Furthermore, while the melting point of the solder is 180 ° C to 200 ° C, the melting point of the low melting point alloy used is 200 ° C to 250 ° C.
However, since the amount of solder is a little lower, it is difficult to control the temperature of the electric furnace, which causes problems such as defective soldering and easy flux residue, which causes internal corrosion. Even if the temperature is strictly controlled, the flux is applied and soldered after winding the low melting point alloy, so the flux is likely to remain and careful production is performed to prevent aging corrosion. Management was required.

Therefore, an object of the present invention is to provide a method for manufacturing a fuse with a nail, which is structurally free from the risk of residual flux inside, can be adopted in an efficient manufacturing method, and can be expected to stabilize quality. There is a place to do it.

[Means for solving problems]

In the present invention, the low melting point alloy portion which sandwiches the central bridge core and covers the bridge core portion of the fuse base having the heat generating portion and the claw terminals at both ends is cast and molded by a mold, and as a manufacturing method, The base soldering process is performed in advance on the installation region of the low melting point alloy portion extending over the bridge core and the vicinity thereof, and the low melting point alloy portion is cast by forming in the mold that defines the installation region.

[Action]

Since the low melting point alloy portion is formed by the casting method, complicated processing steps other than the base soldering step are not required, and the manufacturing process is significantly simplified. Moreover, simultaneous molding of a plurality of pieces is easy, and the quality is stable. Since the base soldering process is performed, the low melting point alloy part and the fuse base are integrally connected by casting. Although the flux is used in the base soldering process, it is just the base process, and the flux is completely removed by cleaning, so that the flux does not remain in the product.

〔Example〕

Hereinafter, it will be described in more detail with reference to FIG. 1 showing the manufacturing process of the fuse with a nail according to the present invention.

FIG. 1A shows a fuse base 1 having a bridge core 1a at the center and a heat generating portion 1b and a claw terminal 1c at both ends.
And is stamped and molded from a metal plate.

FIG. 2B shows a state in which the fuse base 1 is subjected to a base soldering treatment. Flux is applied to the installation region of the low melting point alloy portion extending over the bridge core 1a and its vicinity, and then the base treatment is performed. It was soldered.

After sufficiently washing, as shown in FIGS. 3C to 3E, the low melting point alloy portion 3 is cast and formed by placing the low melting point alloy in the mold 2 for partitioning the installation region and pouring the low melting point alloy portion 3. The mold 2 used in this example partitions the installation area and continuously connects adjacent installation areas with a relatively narrow connecting space 4. In the casting completion state, FIG. As shown in FIG. 5, the low melting point alloy portion 3 is in a connected state in the connection space 4 and is a molded product. Therefore, if you take out one fuse located at the end, you can easily take out multiple fuses from the mold at the same time.
Multiple end products can be obtained at the same time.

〔The invention's effect〕

Since the low-melting-point alloy portion is molded by casting, which has not been seen in the prior art, as described above, the clawed fuse according to the manufacturing method of the present invention can significantly simplify the manufacturing process. Of course, unlike the conventional winding and soldering structure,
There was no fear of flux remaining inside, and it was possible to simply and continuously produce stable, high-quality claw fuses without requiring special careful production control.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a manufacturing process of a fuse with a claw according to the present invention, and FIG. 2 is an explanatory view showing a conventional manufacturing process. 1 ... Fuse base, 1a ... Bridge core 1b ... Heating part, 1c ... Claw terminal 2 ... Mold, 3 ... Low melting point alloy part

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Kiyoshi Minamimoto, 4-25 Awaji-cho, Higashi-ku, Osaka-shi, Osaka, Osaka, Osaka, Ltd. (72) Shigeru Kuga 4-25, Awaji-cho, Higashi-ku, Osaka, Osaka Inside Osaka-Hyuse Co., Ltd. (56) Bibliography Sho 55-46990 (JP, Y2) Sho 52-3626 (JP, Y2)

Claims (2)

[Claims] 1. A method of manufacturing a fuse with a claw comprising a fuse base having a heat generating portion and a claw terminal at both ends with a central bridge core sandwiched between the fuse base and a low melting point alloy portion covering the bridge core portion of the fuse base. The process of performing the base soldering treatment on the installation area of the low melting point alloy portion extending over the bridge core of the fuse base and its vicinity, and the fuse base subjected to the base soldering treatment is used as a mold for partitioning the installation area of the low melting point alloy portion. A method of manufacturing a fuse with a pawl, which comprises a step of installing and casting a low melting point alloy part and a step of taking out from a mold. 2. A plurality of fuse bases preliminarily subjected to a base soldering treatment can be arranged side by side in the installation region of the low melting point alloy portion,
The method of manufacturing a fuse with a pawl according to claim 1, wherein a die for partitioning the installation area and connecting adjacent installation areas with a relatively narrow connecting space is used.