JP2879167B2 - Manufacturing method of fuse - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for manufacturing a fuse, and particularly to a fuse box or the like provided in a middle part of an electric circuit such as an automobile to protect the electric circuit. And a method of manufacturing a fuse.

[Conventional technology]

2. Description of the Related Art Generally, automobiles and the like are equipped with a fuse for protecting an electric circuit when an excessive current flows in various electric circuits.

Such a fuse is disclosed in, for example, Japanese Patent Publication No. 54-36726.

FIG. 7 shows such a fuse. The fuse 1 has a pair of flat terminals 2, 2 arranged in parallel. , 10A, 15
A fusing wire 3 having a capacity corresponding to various current values such as A and 20A is connected. A cover member 4 made of a transparent resin or the like that covers the fusing line 3 is disposed outside the terminal 2.

Then, for example, the terminal 2 of the fuse 1 having a current value corresponding to the current value of the female terminal is inserted into a female terminal portion of a fuse box (not shown) arranged in the middle of an electric circuit mounted on an automobile or the like. Therefore, when an excessive current flows in the electric circuit due to a short circuit of a wiring or the like, the fuse 1 is blown and the fuse 3 is blown, thereby ensuring circuit safety. Has been made.

However, in the conventional fuse, since it is necessary to sequentially mount the fuses 1 on the respective female terminal portions of the fuse box, the mounting operation of the fuses 1 is extremely complicated, and moreover, there are various types of fuses corresponding to current values. Since the fuse 1 is provided, there is a problem that the fuse 1 having a different current value may be erroneously mounted. Furthermore, when the fuse 1 is blown due to an excessive current, it is necessary to replace the fuse 1 with a new one. In addition, there is a problem that the replacement work of the fuse 1 is extremely difficult.

Therefore, as disclosed in JP-A-53-109156, a fuse in which a plurality of pairs of terminals are integrally formed has been developed.

As shown in FIGS. 8 and 9, a plurality of predetermined pairs of terminals 2, 2 are provided on a printed wiring board 5, as shown in FIGS.
... and a pattern of the fusing line 3 connecting each pair of the terminals 2 is formed by resist printing and developed, and then etched to form a pattern of the terminal 2 and the fusing line 3 made of copper foil. This printed wiring board 5
After the cleaning, a cover film 6 is formed to cover the fusing wire 3 to manufacture the fuse 1 in which a plurality of pairs of terminals 2 are integrally formed. The fusing wire 3 of the terminal 2 corresponds to the current value of each female terminal of the fuse box in which the fuse 1 is mounted.

In such a fuse 1, by inserting the fuse 1 in which all the terminals 2 are integrated into the female terminal portion of the fuse box, the terminal 2 corresponding to the current value of each female terminal of the fuse fox is mounted. The terminal 2 having a different current value can be easily mounted without erroneous mounting.
Can be mounted. In addition, when the blown wire 3 is blown by an excessive current, the fuse 1 can be easily replaced by a single operation of removing the fuse 1.

Further, in the fuse 1 described above, a pattern of a plurality of pairs of terminals 2, 2,...
By increasing the dimensional accuracy at the time of resist printing, a plurality of pairs of terminals 2,
(2) An interval having a required dimensional accuracy can be provided between each other.

[Problems to be solved by the invention]

However, in the above-described conventional fuse, the steps of resist printing and etching of the printed wiring board 5 cause
Since the fuse 1 is manufactured, the number of manufacturing steps is extremely large, and a large-scale manufacturing facility is required. Therefore, there is a problem that the fuse 1 cannot be manufactured easily and at low cost. .

Further, the characteristics of the fuse 1 vary depending on conditions such as an etching solution and an etching time, and further, the terminal 2 and the fusing line 3 are formed by etching, so that the etching film thickness is limited. There is a problem that the capacity of the fusing line 3 is limited, and the fusing line 3 corresponding to a large current cannot be formed.

The present invention has been made in view of the above points, and while ensuring a high-precision spacing between a plurality of pairs of terminals in a final completed state, and particularly ensuring uniform characteristics of a fusing portion, a large current. It is another object of the present invention to provide a method for manufacturing a fuse which can be easily and inexpensively manufactured.

[Means for solving the problem]

In order to achieve the above object, a method for manufacturing a fuse according to the present invention is mounted on a fuse box or the like disposed in a middle part of various electric circuits of an automobile or the like, and when an excessive current flows through the electric circuit, In a method of manufacturing a fuse for protecting an electric circuit, a plurality of terminal plate units, in which a pair of terminals are connected through a fusing portion having a capacity corresponding to a current value of the electric circuit, are connected to a single connecting plate portion. By unifying, a single plate-shaped unit substrate in which the terminal plate units are arranged at intervals from each other is formed in advance,
A part of each of the terminals, the connecting plate portion, and the connecting portion between the connecting plate portion and each of the terminal plate units are each exposed, so that the surface of the unit substrate is covered with a thermosetting resin, The method includes a step of connecting the plurality of terminal plate units to each other by the thermosetting resin.

[Action]

According to the method for manufacturing a fuse of the present invention, a plurality of terminal plate units connected to a pair of terminals via a fusing portion are connected to a connecting plate portion, and the terminal plate units are arranged at intervals from each other. Since a single unitary board in the form of an integrated plate is formed in advance, the fusing portion is formed by punching a plate material together with a pair of terminals without using resist printing or etching. The fuse can be manufactured very easily and inexpensively so that there is no variation in the current, and the capacity of the fusing part can be set arbitrarily, and it can handle any current from small current to large current Is what you can do.

Moreover, the surface of the unit substrate formed in advance is covered with a thermosetting resin so that a part of each terminal, a connecting plate portion, and a connecting portion between the connecting plate portion and each terminal plate unit are exposed. Since the plurality of terminal plate units are connected to each other by the thermosetting resin, the plurality of terminal plate units are connected to each other by the connecting plate portion until the surface of the unit substrate is covered with the thermosetting resin. If so, after that point, even when the connecting plate portion is separated from each terminal plate unit by cutting at the connecting portion between the connecting plate portion and each terminal plate unit, the pair of terminals are connected via the fusing portion. The plurality of terminal plate units can be maintained in a state where a high precision interval is provided between the respective terminal plate units.

〔Example〕

Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 6.

FIG. 1 and FIG. 2 show an embodiment of the present invention. In a fuse 1, a plurality of pairs of flat terminals 2, 2,... A fusing wire 3 as a fusing portion having a thickness corresponding to the current value of each female terminal of a fuse box (not shown) to which the terminal 2 is attached is connected between the pair of terminals 2. A cover member 4 made of a thermosetting resin or the like is welded to the surface of the terminal 2 so as to protect the fusing wire 3 and expose only one end of the terminal 2. 4 covers the surface portion of the terminal 2 excluding one end surface.

Next, a method of manufacturing the fuse 1 according to the present embodiment will be described with reference to FIGS.

In the present embodiment, as shown in FIG. 4, a lower mold 7 having a length dimension substantially equal to the length of the terminal 2 and a lower mold 7 disposed above and below the lower mold 7 so as to be able to move up and down. An apparatus for manufacturing the fuse 1 having an upper mold 9 having a cutting blade 8 protruding downward at an end edge is provided.

First, as shown in FIG. 3, a plurality of pairs of terminals 2 and a fusing wire 3 connected between each pair of terminals 2 are connected to one side edge of a long connecting plate 10 via connecting pieces 11. Are integrally formed by means such as press working. Thereby, as shown in FIGS. 3 and 4, the terminal plate unit in which the pair of terminals 2, 2 are connected via the fusing portion 3 is connected to the connecting piece 11 (corresponding to the connecting plate portion).
To form a single plate-shaped unit substrate in which the terminal board units are integrated with each other at intervals. The fusing wire 3 is formed to have a capacity corresponding to the type such as 7.5 A, 10 A, 15 A, 20 A, etc., based on a predetermined current value of an electric circuit to which the corresponding terminal 2 is mounted.

Next, a thermosetting resin 12 forming the cover member 4 is stacked and mounted on the upper surface of the lower mold 7, and the terminals 2 formed integrally with the connecting plate 10 are mounted on the upper surface of the resin 12. ,further,
A resin 12 having a length such that an end of the terminal 2 is exposed is stacked and mounted on the upper surface of the terminal 2. Each resin 12 has a number
The thickness of the cover member 4 can be adjusted by adjusting the number of laminations of the resin 12.

In this state, the upper mold 9 is lowered, and the upper mold 9
The cutting piece 8 cuts the connecting piece 11 and the terminal 2 and simultaneously presses the upper mold 9 and the lower mold 7 at a pressure of about 5 kg / cm ^{2 and} heats them at about 170 ° C. for 30 minutes. As a result, the fuse 1 in which the cover member 4 is welded and covered so that the entire end of the terminal 2 is exposed is formed.

In order to maintain the interval between the terminals 2 with high accuracy,
When the terminal 2 or the like is pressed, a connecting plate may be formed at the other end of the terminal 2 and a cutting blade may be formed at the front edge of the upper mold. Further, the terminals 2 can be formed on both side surfaces with the cover member 4 interposed therebetween. In this case, the mounting density of the terminals 2 can be significantly improved.

Then, by inserting the fuse 1 into the female terminal portion of a fuse box of an automobile or the like, the terminal 2 corresponding to the current value of each female terminal of the fuse box can be mounted. Different terminals 2
The mounting work of the fuse 1 can be easily performed without erroneous mounting. In addition, when the blown wire 3 is blown due to an excessive current, the fuse 1 can be easily replaced by a single work of removing the fuse 1.

Therefore, in this embodiment, the terminal 2 and the fusing wire 3 are formed by press working without performing resist printing, etching, and the like, and the thermosetting resin 12 is pressed on both sides of the terminal 2 in a heated state. As a result, the fuse 1 can be manufactured, so that a large-scale manufacturing facility is not required, and the fuse 1 having no variation in characteristics can be manufactured very easily and at low cost. Further, the capacity of the fusing wire 3 can be set arbitrarily, and it is possible to cope with any current from a small current to a large current.

Moreover, in the present embodiment, a plurality of terminal plate units, which connect the pair of terminals 2, 2 via the fusing portion 3, are connected to the connecting piece 11, and the terminal plate units are arranged at intervals from each other. The surface of the unit substrate previously formed in a plate shape integrated with the above is so set that a part of each terminal 2, a connecting piece 11, and a connecting portion between the connecting piece 11 and each terminal plate unit are exposed. Since the plurality of terminal board units are connected to each other by the thermosetting resin 12 by being covered with the thermosetting resin 12, the connection is performed until the surface of the unit substrate is covered with the thermosetting resin 12. If the plurality of terminal plate units are connected to each other by the piece 11, after that point, at the connection portion between the connection piece 11 and each terminal plate unit, the connection piece 11 may be separated from each terminal plate unit by cutting. ,
A plurality of terminal plate units in which the pair of terminals 2, 2 are connected via the fusing portion 3 can be maintained in a state where a high precision space is provided between the terminal plate units.

As shown in FIG. 6, the fuse 1 in which a plurality of pairs of terminals 2 manufactured by the above-described method are integrally formed is cut by the cutter 13 into each pair of terminals 2 so that the fuses 1 are individually formed. In this case, the manufacturability of the fuse 1 can be significantly improved.

〔The invention's effect〕

As described above, according to the method for manufacturing a fuse according to the present invention, the fusing portion is formed by punching a plate material together with a pair of terminals without using resist printing or etching, and the fusing characteristics of the fusing portion are particularly improved. The fuse can be manufactured very easily and inexpensively so that there is no variation. Furthermore, the capacity of the fusing portion can be set arbitrarily, and it can handle any current from a small current to a large current. be able to.

Moreover, if the plurality of terminal plate units are connected to each other by the connecting plate portion until the time of coating the surface of the unit substrate with the thermosetting resin, after that point, the connecting portion between the connecting plate portion and each terminal plate unit is connected. Even when the connecting plate portion is separated from each terminal plate unit by cutting, a plurality of terminal plate units in which a pair of terminals are connected via a fusing portion have a high-precision spacing between the terminal plate units. There is an effect that it can be kept in the state of being laid.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of a fuse according to the present invention, FIG. 2 is a sectional view taken along line AA of FIG. 1, and FIG. 3 is a perspective view of a terminal part formed by press working. FIG. 4 is a side view showing a manufacturing process of a fuse using a mold, FIG. 5 is a side view showing a pressed state by a mold, and FIG. 6 is an embodiment in which the fuses shown in FIG. 1 are used individually. FIG. 7 is a perspective view showing a conventional fuse, FIG. 8 is a perspective view showing another conventional fuse manufacturing process, and FIG. 9 is a perspective view showing a completed state of the fuse shown in FIG. FIG. DESCRIPTION OF SYMBOLS 1 ... Fuse, 2 ... Terminal, 3 ... Fusing wire, 4 ... Cover member, 7 ... Lower mold, 9 ... Upper mold, 10 ... Connection plate, 11 ... Connection piece, 12 ... ... thermosetting resin.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) H01H 85/12

Claims (1)

(57) [Claims] 1. A method of manufacturing a fuse mounted on a fuse box or the like provided in a middle part of various electric circuits of an automobile or the like to protect the electric circuit when an excessive current flows in the electric circuit. In the terminal plate unit, a plurality of terminal plate units connected to a pair of terminals via a fusing portion having a capacity corresponding to a current value of the electric circuit are connected to a single connecting plate portion and integrated. A single plate-shaped unit substrate in which units are arranged at intervals from each other is formed in advance, and a part of each terminal, the connection plate portion, and the connection plate portion and each terminal plate unit. Having a step of covering the surface of the unit substrate with a thermosetting resin so that the connection portions of the terminal board units are connected to each other by the thermosetting resin. Hugh to feature Manufacturing method.