JPH09239582A - Linear solder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely feed a specified amount of solder by forming feeding marks, corresponding to the amount for soldering every a prescribed gap in the longitudinal direction, into a prescribed length and depth around a linear solder in a string shape. SOLUTION: The linear solder 10 is uniformly provided with marks 11 parallel to the longitudinal direction with a gap of 2.5mm per one scale over around the linear solder to form a stripe pattern 11A. In an automatic soldering machine, the stripe pattern 11A of the linear solder 10 is identified with a solder feeding amount check sensor consisting of a light emitting diode or the like, feeding is stopped and molten to form fillets when the amount corresponding to a specified scale is fed. By this way, since the solder corresponding to the specified scale is surely fed, specified fillets not possibly generating cracks or the like are formed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a linear solder, and is suitable for application to, for example, soldering an electronic component to a printed wiring board.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 6 (A), a linear solder 1 has a dent such as a flux inside, and the surface is not marked at all. Further, as shown in FIG. 6 (B), this linear solder 1 is generally commercially available in a state of being wound around a bobbin 2. The soldering work for soldering an electronic component to a printed wiring board using the linear solder 1 may be performed manually by an operator or automatically by a robot or the like.

In a manual manual soldering operation, an operator supplies a prescribed amount of linear solder 1 on the basis of experience and feeling and melts the solder by heat from a soldering iron to obtain a prescribed solder joint (hereinafter Are called solders) and soldered. Also, in the automatic soldering work using a robot or the like, the length of the linear solder 1 sent by the automatic feed mechanism is measured, the feed rate is adjusted, and the specified amount is supplied to form the specified fillet. Are soldering.

[0004]

By the way, in the manual soldering work, since the linear solder 1 is supplied based on the experience and feeling of the operator, the amount of the linear solder to be supplied is different for each operator. different. As a result, there is a problem in that the amount of the linear solder is less than the specified amount and the specified fillet cannot be formed.

Further, in the manual and automatic soldering operations, the fillet formed after the soldering is extremely important in terms of reliability. For this reason, cracks such as cracks may occur in the fiat unless a prescribed fiat is formed. Therefore, in the soldering work, it was necessary to reliably supply the linear solder 1 in a specified amount in order to prevent cracks such as cracks.

Therefore, as shown in FIG. 7A, in the linear solder 3, a dotted line-shaped marking 4 is formed in a direction perpendicular to the longitudinal direction.
Are uniformly provided at predetermined intervals, and the operator solders up to the marking 4 portion of the linear solder 3,
A specified amount of the linear solder 3 is melted to form a specified frit and soldered. However, as shown in FIG. 7 (B), since the linear solder 3 is provided with the markings 4 in the direction perpendicular to the longitudinal direction, there is a problem that the linear solder 3 is weak in strength and easily broken.

On the other hand, as shown in FIG. 8, a linear solder 6 is printed on the surface by using a solvent such as ink 5 instead of the marking 4.
There is. When soldering is performed using this linear solder 6, as shown in FIG. 9, the solvent of the ink 5 melted by heat flows into the center portion of the soldering iron 7 and remains there, resulting in poor soldering. There was a problem of causing it.

The present invention has been made in consideration of the above points, and an object thereof is to propose a linear solder capable of reliably supplying a specified amount with a simple structure.

[0009]

In order to solve such a problem, in the present invention, a supply mark corresponding to the supply amount of soldering is formed on the surface at predetermined intervals in the longitudinal direction of a linear solder in the form of a string. To do. Thereby, during the soldering work, the supply mark formed on the linear solder can be confirmed, and the specified amount of the linear solder can be reliably supplied.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings.

FIG. 1 shows the overall structure of a linear solder 10 according to the present invention. Linear solder 10 is one scale
By providing parallel markings 11 along the longitudinal direction at intervals of 2.5 [mm] uniformly over the circumference, a striped pattern 11A as a supply mark is formed.

2.5 [m provided for each striped pattern 11A
The interval [m] is determined according to the wire diameter of the linear solder 10 and the size of the fillet to be formed. In this case, in the linear solder 10, when the solder of up to 3 graduations (7.5 [mm]) is melted, a finite amount of fillet is formed.

Next, as shown in FIG. 2, in the linear solder 10, the rollers 12 and 13 having the claw portions similar to the striped pattern 11A sandwich the linear solder 10 from both sides with a predetermined force and the direction shown by the arrow. By rotating in the manner described above, the striped pattern 11A is formed over the entire circumference of the circumferential side surface.

Next, FIG. 3 shows the entire structure of an automatic soldering machine 20 for soldering using the linear solder 10. In the automatic soldering machine 20, the linear solder 10 is pulled out from the bobbin 21, supplied through the feeding mechanism 22 and the pipe feeder 23, and melted by the soldering iron 7 to be soldered.

In this case, in the automatic soldering machine 20, the solder supply amount check sensor 26 including the light source portion 24 such as a light emitting diode and the light receiving portion 25 recognizes the striped pattern 11A of the linear solder 10 and sets the prescribed 3 The scale (7.5 [mm]) is fed by the feed mechanism 22. Automatic soldering machine 2
At 0, the solder supply amount check sensor 26 always recognizes the striped pattern 11A of the linear solder 10, and the linear solder 10 is fed once when the prescribed 3 scales (7.5 [mm]) are supplied. It is designed to be stopped and melted by the soldering iron 7 to form a prescribed fillet.

Next, FIGS. 4A to 4G show a soldering process by the automatic soldering machine 20 using the linear solder 10. As shown in FIG. 4A, the automatic soldering machine 20 mounts the lead legs 33 of the electronic component on the copper foil land 32 of the printed wiring board 31 and prepares for soldering. Then, as shown in FIG. 4 (B), in the automatic soldering machine 20, the soldering iron 7 is brought close to the foot 33 of the lead placed on the copper foil land 32, and the linear solder 10 is applied to the soldering iron 7. To melt.

Subsequently, as shown in FIG. 4C, in the automatic soldering machine 20, the linear solder 10 is moved to the first scale (2.5
melts to [mm]). Then, as shown in FIG.
In the automatic soldering machine 20, the linear solder 10 is further melted up to the second scale (5 [mm]). Next, as shown in FIG. 4 (E), in the automatic soldering machine 20, the linear solder 10
Is further melted to the third scale (7.5 [mm]) and the supply of the linear solder 10 is once stopped. Then, as shown in FIG. 4 (F), in the automatic soldering machine 20, the linear solder 10 and the soldering iron 7 are separated from the lead legs 33. Finally, FIG.
As shown in (G), in the automatic soldering machine 20, the molten linear solder 10 is solidified to form a prescribed fillet 34.
To form

With the above structure, the automatic soldering machine 2
At 0, the solder supply amount check sensor 26 always recognizes the striped pattern 11A of the linear solder 10, so that the linear solder 10 up to the third graduation can be reliably fed by the feeding mechanism 22 and soldered. It is possible to prevent the cracks such as cracks from being generated and the prescribed fillet 34
Can be reliably formed.

For the linear solder 10, one scale is 2.5 [m
The stripe pattern 11A is formed by uniformly providing the markings 11 parallel to the longitudinal direction at intervals of [m] each, so that the worker can manually perform the stripe pattern 11A.
It is possible to form a prescribed fillet by supplying an appropriate amount of the linear solder 10 while confirming as a scale.

In addition, the linear solder 10 has a striped pattern 11 in which markings 11 parallel to the longitudinal direction are uniformly provided around the circumference.
By forming A, it is stronger than the conventional linear solder 1 and less likely to break. Furthermore, the linear solder 10 is
Since the striped pattern 11A is formed by the marking 11, the solvent such as ink does not melt out and the soldering failure does not occur as compared with the linear solder 6 displayed with ink.

According to the above structure, in the linear solder 10, the markings 11 parallel to the longitudinal direction are evenly provided all over the circumference to form the striped pattern 11A, so that when the soldering is performed, It can be used as a guide for the supply amount, and it is possible to realize the linear solder that can reliably supply the specified amount.

In the above-mentioned embodiment, the case where the markings 11 are uniformly provided around the periphery of the linear solder 10 to form the striped pattern 11A as the supply mark has been described. Instead of the marking 11, a small amount of ink may be displayed in a dotted line. As a result, as shown in FIG. 5, the amount of ink is smaller than that of the conventional linear solder 6 on which ink is displayed, so that there is no possibility that ink will remain during soldering work and cause soldering failure.

In the above-mentioned embodiment, the case where the parallel markings 11 are provided uniformly along the longitudinal direction over the circumference to form the striped pattern 11A has been described.
The present invention is not limited to this, but if the worker and the solder supply amount check sensor 26 can discriminate the striped pattern 11A, not only the entire circumference but also a part of the marking can be engraved. May be. Also in this case, the same effects as those of the above-described embodiment can be obtained.

Further, in the above embodiment, the striped pattern 1
Although the case where 1A is provided at intervals of 2.5 [mm] has been described, the present invention is not limited to this, and the interval may be an integral multiple of 2.5 [mm] depending on the wire diameter of the linear solder 10, or Other various distance intervals may be used depending on the size of the defined flit.

Further, in the above-mentioned embodiment, the case where the engraved mark 11 is provided by pressing and rotating the rollers 12 and 13 as shown in FIG. 2 has been described, but the present invention is not limited to this. The striped pattern 11A may be formed by various other methods.

[0026]

As described above, according to the present invention, by forming the supply marks according to the supply amount of the soldering on the surface at predetermined intervals in the longitudinal direction of the string-shaped linear solder, It is possible to confirm the supply mark provided on the linear solder, and it is possible to realize the linear solder that can reliably supply the specified amount.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a linear solder according to an embodiment of the present invention.

FIG. 2 is a schematic diagram showing a method of forming a marking of linear solder according to an embodiment of the present invention.

FIG. 3 is a schematic view showing a configuration of an automatic soldering machine according to an embodiment of the present invention.

FIG. 4 is a process drawing showing a soldering process according to an embodiment of the present invention.

FIG. 5 is a schematic diagram showing a soldering process using ink-displayed linear solder according to another embodiment.

FIG. 6 is a schematic diagram showing a conventional linear solder.

FIG. 7 is a schematic diagram showing a marking of a conventional linear solder.

FIG. 8 is a schematic diagram showing a conventional linear solder in which ink is displayed.

FIG. 9 is a schematic diagram showing a state of soldering using a conventional linear solder in which ink is displayed.

[Explanation of symbols]

1, 3, 6, 10 ... Linear solder, 2, 21 ... Bobbin, 4, 11 ... Stamp, 11A ... Stripe pattern, 5 ... Ink, 7 ... Soldering iron, 12, 13 ... Roller , 20 ……
Automatic soldering machine, 22 ... Feed mechanism, 23 ... Pipe feeder, 24 ... Light source section, 25 ... Light receiving section, 26 ...
Solder supply amount check sensor, 31 ... printed wiring board, 32 ... copper foil land, 33 ... lead leg, 34 ...
… Filetto.

Claims (5)

[Claims] 1. A linear solder, which is in the form of a string and has supply marks formed on the surface at predetermined intervals in the longitudinal direction according to the supply amount of soldering. 2. The linear solder according to claim 1, wherein the supply mark is an inscription having a predetermined length and a predetermined depth along the longitudinal direction. 3. The linear solder according to claim 2, wherein the marking is uniformly provided around the linear solder. 4. The linear solder according to claim 1, wherein the supply mark is marked with ink. 5. The linear solder according to claim 4, wherein the supply mark is formed with ink at predetermined intervals over the periphery of the linear solder.