JP4222441B1 - Method for supplying lead-free bar-shaped solder to solder bath and solder bath - Google Patents

Method for supplying lead-free bar-shaped solder to solder bath and solder bath Download PDF

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JP4222441B1
JP4222441B1 JP2008523833A JP2008523833A JP4222441B1 JP 4222441 B1 JP4222441 B1 JP 4222441B1 JP 2008523833 A JP2008523833 A JP 2008523833A JP 2008523833 A JP2008523833 A JP 2008523833A JP 4222441 B1 JP4222441 B1 JP 4222441B1
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solder
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JPWO2008155817A1 (en
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秀樹 中村
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Senju Metal Industry Co Ltd
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K3/00Tools, devices, or special appurtenances for soldering, e.g. brazing, or unsoldering, not specially adapted for particular methods
    • B23K3/08Auxiliary devices therefor

Abstract

【課題】鉛フリーはんだのはんだ槽に鉛は絶対に混入してはならない。例え鉛フリー棒状はんだの形状を鉛入り棒状はんだの形状と相違させても、はんだ槽の近傍に鉛入り棒状はんだを置いておくと、これがはんだ槽に投入されることがあった。
【解決手段】本発明は、はんだ槽上部に鉛入り棒状はんだと形状の異なる鉛フリー棒状はんだは通過させるが、鉛入り棒状はんだは通過させない通過部を設置し、はんだ槽に投入時には該通過部から投入するようにする。
【選択図】図1
An object of the present invention is to ensure that lead must not be mixed in a solder bath for lead-free solder. Even if the shape of the lead-free bar-shaped solder is different from that of the lead-containing bar-shaped solder, if the lead-containing bar-shaped solder is placed in the vicinity of the solder tank, it may be put into the solder tank.
A lead-free bar-shaped solder having a different shape from that of a lead-containing bar-shaped solder is allowed to pass through the upper part of the solder tank, but a passing part that does not allow the lead-shaped bar-shaped solder to pass therethrough is installed. To put in.
[Selection] Figure 1

Description

本発明は、はんだを溶融させてプリント基板のはんだ付けを行うはんだ槽に鉛フリー棒状はんだを供給する方法およびはんだ槽に関する。   The present invention relates to a method and a solder bath for supplying lead-free bar solder to a solder bath for melting a solder and soldering a printed circuit board.

一般に、プリント基板のはんだ付け方法としては、鏝付け法、リフロー法、フロー法がある。   Generally, there are a soldering method, a reflow method, and a flow method as soldering methods for a printed circuit board.

鏝付け法とは、はんだ付け部一箇所毎に脂入りはんだをあてがいながら、脂入りはんだとはんだ付け部を高温に熱せられたはんだ鏝で加熱して、はんだ付けを行う方法である。この鏝付け法は、はんだ付け部一箇所毎のはんだ付けであるため、大量箇所のはんだ付けはできず、他のはんだ付け方法ではんだ付けできなかったはんだ付け箇所や、他のはんだ付け方法で発生した不良箇所の修正に適している。   The brazing method is a method of performing soldering by applying the greased solder to each soldered portion and heating the greased solder and the soldered portion with a soldering rod heated to a high temperature. Since this soldering method is soldering at each soldering part, it is not possible to solder a large number of parts, and soldering parts that could not be soldered by other soldering methods or other soldering methods Suitable for correcting defective parts that have occurred.

リフロー法とは、プリント基板のはんだ付け部と同一箇所に穴が穿設されたメタルマスクやシルクスクリーンをプリント基板に重ね合わせ、その上に粉末はんだとフラックスからなるソルダペーストを載置してからスキージーで掻きならして、多数のはんだ付け部にソルダペースト印刷塗布する。その後、該プリント基板をリフロー炉で加熱して、ソルダペーストを溶融させることによりプリント基板のはんだ付けを行う方法である。このリフロー法は、多数のはんだ付け部を一度の作業ではんだ付けができるため、生産性に優れているが、経済性の面で問題があった。なぜならばリフロー法では、ソルダペーストを用いるが、ソルダペーストの粉末はんだを製造するのに多大な手間と高価な製造装置が必要であり、そのためにソルダペーストが高価となるからである。   With the reflow method, a metal mask or silk screen with holes drilled in the same location as the soldering part of the printed circuit board is overlaid on the printed circuit board, and solder paste consisting of powder solder and flux is placed on it. Stir with a squeegee and apply solder paste to many soldered parts. Thereafter, the printed circuit board is heated in a reflow furnace to melt the solder paste, thereby soldering the printed circuit board. This reflow method is excellent in productivity because a large number of soldered portions can be soldered in one operation, but has a problem in terms of economy. This is because solder paste is used in the reflow method, but it requires a great amount of labor and an expensive manufacturing apparatus to manufacture the solder paste powder solder, which makes the solder paste expensive.

フロー法とは、プリント基板のはんだ付け面全体に液状フラックスを塗布し、予備加熱後、はんだ槽で噴流する溶融はんだにプリント基板を接触させてはんだ付けを行う方法である。このフロー法も、リフロー法同様に、多数のはんだ付け部を一度の作業ではんだ付けできるという生産性に優れているばかりでなく、リフローよりも経済性に優れている。つまりフロー法に用いるはんだは、棒状はんだであり、該棒状はんだは、溶融したはんだを鋳型に流し込んだり、大きなビレットを押出機で押し出したりする、という簡単な方法で、しかも大量に生産できるからである。   The flow method is a method in which a liquid flux is applied to the entire soldering surface of a printed circuit board, and after preheating, the printed circuit board is brought into contact with molten solder jetted in a solder bath to perform soldering. Like the reflow method, this flow method is not only excellent in productivity in that a large number of soldered portions can be soldered in one operation, but also more economical than reflow. In other words, the solder used in the flow method is a rod-shaped solder, and the rod-shaped solder can be produced in large quantities by a simple method of pouring molten solder into a mold or extruding a large billet with an extruder. is there.

ところでプリント基板のはんだ付けには、かつてはPb−Snはんだ(以下、鉛入りはんだという)が用いられていた。しかしながら鉛入りはんだで、はんだ付けされた電子機器が故障したり、古くなって使い勝手が悪くなったりしても、修理や機能向上せず、廃棄されることが多かった。廃棄された電子機器は、ケースのプラスチックやシャーシーのような金属は、取り出して再利用されるが、はんだ付けされたプリント基板は再利用ができないため埋め立て処分となっていた。はんだ付けしたプリント基板が再利用できない理由は、はんだ付け部の銅とはんだとが金属的に合金化されており、この合金化した部分の銅とはんだとを完全に分離できないからである。この埋め立て処分されたプリント基板に酸性雨が接触すると、はんだ中のPb成分が溶出し、さらに地中深く浸透して、ついには地下水と混合する。そしてPb成分を含んだ地下水を人間や家畜が長期間にわたって飲用すると、鉛中毒を起こすとされ、現在は地球規模で鉛入りはんだの使用が規制されている。   By the way, Pb-Sn solder (hereinafter referred to as lead-containing solder) has been used for soldering printed circuit boards. However, even if the soldered electronic equipment breaks down or becomes unusable due to the use of lead-containing solder, it is often discarded without being repaired or improved in function. In discarded electronic devices, metal such as plastic in the case and chassis are taken out and reused, but soldered printed circuit boards cannot be reused and are disposed of in landfills. The reason why the soldered printed circuit board cannot be reused is that the copper and solder in the soldered portion are alloyed metallicly, and the copper and solder in the alloyed portion cannot be completely separated. When acid rain comes into contact with the printed circuit board that has been disposed of in landfill, the Pb component in the solder elutes, penetrates deep into the ground, and finally mixes with the groundwater. And if humans and livestock drank groundwater containing Pb components for a long time, lead poisoning is caused, and now the use of lead-containing solder is regulated on a global scale.

日本では、鉛入りはんだは、現在のところ電子機器メーカーの自主規制により使用を控えており、欧州ではRoHS指令により規制されている。   In Japan, leaded solder is currently refrained from voluntary regulations by electronic device manufacturers, and in Europe it is regulated by the RoHS directive.

そのため現在、電子機器のはんだ付けには、鉛入りはんだに代えて鉛フリーはんだが使用されるようになってきている。鉛フリーはんだは、JISでも規格化されており、JIS Z3282には次のように記されている。
「鉛フリーはんだ:固相線温度が450℃未満の溶加材で、鉛を含まない錫系はんだの総称。ここでは、錫、亜鉛、アンチモン、インジウム、銀、ビスマス、銅からなる鉛分0.10%以下のはんだをいう。
形状及び寸法:棒状の鉛含有はんだ及び鉛フリーはんだの標準寸法は、約7mm(厚さ)×20mm(幅)×400mm(長さ)とし、標準質量は、鉛含有はんだSn63Pb37の場合は約500g、鉛フリーはんだSn96.5Ag3Cu0.5の場合は約450gとする。また、その他は受渡当事者間の協定による。」
つまりJISでは、鉛入り棒状はんだも鉛フリー棒状はんだも長手方向に直交する断面形状が同一の矩形形状であった。
Therefore, at present, lead-free solder is used instead of lead-containing solder for soldering electronic devices. Lead-free solder is also standardized by JIS, and is described in JIS Z 3282 as follows.
“Lead-free solder: A generic name for tin-based solders with a solidus temperature of less than 450 ° C. and containing no lead. Here, the lead content of tin, zinc, antimony, indium, silver, bismuth and copper is 0. .10% or less solder.
Shape and dimensions: The standard dimensions of rod-shaped lead-containing solder and lead-free solder are about 7 mm (thickness) x 20 mm (width) x 400 mm (length), and the standard mass is about 500 g for lead-containing solder Sn63Pb37 In the case of lead-free solder Sn96.5Ag3Cu0.5, it is about 450 g. Others are based on an agreement between the delivery parties. "
In other words, in JIS, both lead-containing bar-shaped solder and lead-free bar-shaped solder have rectangular shapes having the same cross-sectional shape perpendicular to the longitudinal direction.

このようにJISでは、鉛フリーはんだ中への鉛の混入を厳しく規制しているが、棒状の鉛フリーはんだでは鉛入りはんだと同様の形状となっており、はんだを熟知している者は色や重量で区別ができるが、はんだを熟知していない者にとって、それらの区別が困難である。JISで規定されているように、鉛フリーはんだを用いたフローはんだ付けでは、はんだ槽中に鉛が混入してはならないものであるが、鉛フリーはんだも鉛入りはんだも外形が同じであるため、はんだを熟知していない作業者が外観を見ただけでは、それらの区別がつかず、両者が近くに置かれていると間違う恐れがあった。   In this way, JIS strictly regulates the mixing of lead into lead-free solder, but bar-shaped lead-free solder has the same shape as lead-containing solder. However, it is difficult for those who are not familiar with solder to distinguish them. As stipulated by JIS, in lead-free soldering flow soldering, lead must not be mixed in the solder bath, but lead-free solder and lead-containing solder have the same external shape. However, if an operator who is not familiar with solder only looks at the external appearance, they cannot distinguish between them, and there is a fear that they may be mistaken if they are placed nearby.

現在、前述のように鉛入りはんだは使用が規制されており、フローはんだ付けを行う作業場に鉛フリーはんだと鉛入りはんだが一緒に置かれることは殆どないが、特殊な用途では、まだ鉛入りはんだが使用されることがある。この特殊用途の鉛入りはんだとは、Pb主成分にSnやAgを添加したもので、Pb-5Sn(融点:300〜314℃)、Pb-10Sn(融点:268〜302℃)等の高温はんだである。高温はんだの使用は、電子機器の使用時に熱を発するコイルやパワートランジスター等のはんだ付け箇所、或いはプリント基板を二度にわたってはんだ付けする際に、最初のはんだ付け部が二度目のはんだ付けで溶融してはならない箇所である。   Currently, as described above, the use of lead-containing solder is regulated, and it is rare that lead-free solder and lead-containing solder are placed together in the work place where flow soldering is performed. Solder may be used. This special-purpose lead-containing solder is a Pb main component with Sn and Ag added, and high-temperature solder such as Pb-5Sn (melting point: 300-314 ° C), Pb-10Sn (melting point: 268-302 ° C) It is. The use of high-temperature solder means that when soldering a soldered part such as a coil or power transistor that generates heat when using an electronic device or a printed circuit board twice, the first soldering part is melted by the second soldering. This should not be done.

一般に、はんだ槽では、はんだ付け時にはんだ槽中のはんだがプリント基板に付着していくため、はんだ槽中のはんだが漸次減少していく。するとはんだ槽での溶融はんだの噴流高さが低くなって、はんだ槽の上方を通過するプリント基板に溶融はんだが接触できなくなり、はんだが付かない未はんだとなる。そのため、はんだ槽中の溶融はんだが所定の量よりも少なくなったときには、はんだ液面を検知するセンサーが警報を発し、それに応じて作業者が適宜、棒状はんだをはんだ槽に投入して、はんだ槽の溶融はんだの液面を一定に保つようにしている。   In general, in the solder bath, the solder in the solder bath adheres to the printed circuit board during soldering, so the solder in the solder bath gradually decreases. Then, the jet height of the molten solder in the solder bath is lowered, and the molten solder cannot be brought into contact with the printed circuit board passing above the solder bath, resulting in unsoldered solder. Therefore, when the amount of molten solder in the solder bath becomes less than the predetermined amount, a sensor that detects the solder liquid level issues an alarm, and accordingly, the operator appropriately inserts the bar-shaped solder into the solder bath, The liquid level of the molten solder in the bath is kept constant.

しかしながら、前述のようにPb主成分の高温はんだを使用する作業場では、鉛フリー棒状はんだと鉛入り棒状はんだが一緒に置かれることがあり、作業者が誤って鉛フリーはんだのはんだ槽に鉛入り棒状はんだを投入してしまうことがある。鉛フリーはんだのはんだ槽中に鉛入り棒状はんだが一本(約500g)でも投入されてしまうと、はんだ槽中には約450Kgの鉛フリーはんだが入れられているため、鉛の含有量は0.1%を超えてしまう。それが二本以上となると、さらに鉛含有量が多くなってしまい、それが欧州に輸出された場合は、RoHS規定に違背するため全て回収しなければならなくなる。 However, as mentioned above, lead-free bar-shaped solder and lead-containing bar-shaped solder may be placed together in workplaces that use Pb-based high-temperature solder, and workers accidentally put lead into the lead-free solder bath. Sometimes stick-shaped solder is thrown. If even one (about 500g) lead-containing solder is put in the lead-free solder bath, about 450kg of lead-free solder is put in the solder bath, so the lead content is 0 It will exceed 1%. If it becomes more than two, the lead content will increase further, and if it is exported to Europe, it must be recovered because it violates the RoHS regulations.

このように鉛フリーはんだのはんだ槽中に鉛入りはんだが混入することを防ぐため、見た目でそれらが容易に区別がつくように、鉛フリー棒状はんだを鉛入り棒状はんだと異なる形状にすることが提案されている。その形状とは、鉛フリー棒状はんだを、例えば長手方向に直交する断面形状が一辺20mmの正三角形の棒状にすることである。つまり鉛入り棒状はんだは、JISの規格で規定されているように長手方向に直交する断面形状が7mm×20mmの矩形であり、断面形状が正三角形の鉛フリー棒状はんだとは、一目瞭然に判別できるものである。   In this way, in order to prevent lead-containing solder from entering the lead-free solder bath, the lead-free solder must be shaped differently from lead-containing solder so that they can be easily distinguished by appearance. Proposed. The shape is to make the lead-free rod-shaped solder into a regular triangular rod shape whose cross-sectional shape perpendicular to the longitudinal direction is 20 mm on a side. In other words, the lead-containing bar-shaped solder is a rectangle having a cross-sectional shape of 7 mm × 20 mm perpendicular to the longitudinal direction as defined by JIS standards, and can be clearly distinguished from a lead-free bar-shaped solder having a regular triangular cross-sectional shape. Is.

前述のように、はんだ槽の周囲には鉛フリー棒状はんだと鉛入り棒状はんだが置かれていることがあるが、鉛フリー棒状はんだの断面形状が正三角形であれば、鉛入り棒状はんだとは外観が相違しているため、鉛フリーはんだのはんだ槽中に鉛入り棒状はんだが誤って投入されることはないと考えられていた。しかしながら、外観の異なる鉛フリー棒状はんだと鉛入り棒状はんだを近くに置いておくと、鉛フリーはんだのはんだ槽中に鉛入り棒状はんだが投入されてしまうことがあった。その原因は、作業者への伝達不足や作業者の認識不足である。例えば、はんだ槽中のはんだ量が不足するとはんだ付け不良となることが一大事であり、鉛混入による重大性をよく理解できていない作業者は、はんだ槽中のはんだが減量して警報が発せられると、何の考えもなく自動的にはんだ槽の周辺にある棒状はんだをはんだ槽に投入してしまう。その結果、投入した棒状はんだが鉛入りはんだの場合、鉛フリーはんだのはんだ槽中に鉛が混入してしまうものである。   As mentioned above, lead-free bar-shaped solder and lead-containing bar-shaped solder may be placed around the solder tank, but if the cross-sectional shape of lead-free bar-shaped solder is an equilateral triangle, what is lead-containing bar-shaped solder? Due to the difference in appearance, it was thought that lead-containing bar-shaped solder would not be accidentally put into a lead-free solder bath. However, if a lead-free bar-shaped solder and a lead-containing bar-shaped solder having different appearances are placed close to each other, the lead-containing bar-shaped solder may be put into a lead-free solder bath. The cause is lack of communication to the worker and lack of recognition of the worker. For example, if the amount of solder in the solder bath is insufficient, it is important to have poor soldering. Workers who do not fully understand the seriousness of lead contamination will be alerted when the amount of solder in the solder bath is reduced. Then, without any thought, the bar-shaped solder around the solder bath is automatically put into the solder bath. As a result, when the introduced rod-shaped solder is lead-containing solder, lead is mixed into the lead-free solder bath.

本発明者は、JIS規格で鉛入り棒状はんだの長手方向に直交する断面形状が7mm×20mmの矩形であり、鉛フリー棒状はんだを長手方向に直交する断面形状が一辺20mmの正三角形とした場合、例えば図3(A)に示すように一辺が22mmの正三角形の穴Hに該鉛フリー棒状はんだFを通過させることはできるが、図3(B)に示すように一辺が22mmの正三角形の穴Hには、断面が7mm×20mmの矩形の鉛入り棒状はんだは如何なる方向からも、また傾斜させても絶対に通過させることはできないことに着目して本発明を完成させた。   The present inventor is a case where the cross-sectional shape orthogonal to the longitudinal direction of the lead-containing bar-shaped solder is a 7 mm × 20 mm rectangle according to JIS standard, and the lead-free bar-shaped solder is a regular triangle whose cross-sectional shape orthogonal to the longitudinal direction is 20 mm on a side. For example, as shown in FIG. 3 (A), the lead-free rod-like solder F can be passed through a hole H of a regular triangle having a side of 22 mm, but a regular triangle having a side of 22 mm as shown in FIG. 3 (B). The present invention has been completed by paying attention to the fact that rectangular lead-containing bar-shaped solder having a cross section of 7 mm × 20 mm cannot be passed through the hole H from any direction or tilted.

本発明は、鉛入り棒状はんだの長手方向に直交する断面形状と同断面形状が相違する鉛フリー棒状はんだをはんだ槽に供給する方法において、はんだ槽の上部には鉛入り棒状はんだは通過させないが、鉛フリー棒状はんだを通過させることができる通過部が形成されており、該通過部から鉛フリー棒状はんだを通過させることにより、はんだ槽に鉛フリー棒状はんだを供給する方法である。 In the method of supplying lead-free bar-shaped solder having a cross-sectional shape different from the cross-sectional shape perpendicular to the longitudinal direction of the lead-containing bar-shaped solder to the solder bath, the present invention does not allow the lead-containing bar-shaped solder to pass through the upper portion of the solder bath. In this method, a lead-free bar-shaped solder is passed, and a lead-free bar-shaped solder is supplied to the solder bath by passing the lead-free bar-shaped solder from the passing part.

また別の発明は、溶融はんだにプリント基板を接触させてプリント基板のはんだ付けを行うはんだ槽において、はんだ槽の上部には鉛入り棒状はんだは通過させないが、該鉛入り棒状はんだとは長手方向に直交する断面形状が相違する鉛フリー棒状はんだを通過させることのできる通過部が形成されていることを特徴とするはんだ槽である。 Another invention is a solder bath for soldering a printed circuit board by bringing the printed circuit board into contact with the molten solder, but the lead-shaped bar-shaped solder is not allowed to pass through the upper part of the solder tank. This is a solder bath characterized in that a passage portion through which a lead-free bar-shaped solder having a different cross-sectional shape perpendicular to can be passed.

本発明のはんだ槽における通過部は、鉛フリー棒状はんだは通過させるが、鉛入り棒状はんだは通過させない形状とする。例えば鉛フリー棒状はんだの長手方向に直交する断面形状形状が一辺20mmの正三角形であり、鉛入り棒状はんだの長手方向に直交する断面形状形状が7mm×20mmの矩形であれば、はんだ槽における通過部の形状は、一辺22mmの正三角形にする。この形状であれば、断面形状が7mm×20mmの鉛入り棒状はんだは絶対に通過することができない。   The passage portion in the solder bath of the present invention is shaped so that lead-free bar-like solder is allowed to pass but lead-containing bar-like solder is not allowed to pass. For example, if the cross-sectional shape perpendicular to the longitudinal direction of the lead-free bar-shaped solder is an equilateral triangle having a side of 20 mm, and the cross-sectional shape perpendicular to the longitudinal direction of the lead-containing bar-shaped solder is a rectangle of 7 mm × 20 mm, it passes through the solder tank. The shape of the part is a regular triangle having a side of 22 mm. With this shape, lead-containing bar-shaped solder having a cross-sectional shape of 7 mm × 20 mm can never pass.

はんだ槽における通過部は、単なる穴でもよいが、穴だけでは棒状はんだを挿入するときに、穴の周囲に棒状はんだが当たって挿入しにくくなるため、穴の周囲にガイドを設けたり、穴と同一形状の筒にしておいたりしてもよい。   The passage part in the solder tank may be a simple hole, but when inserting the rod-shaped solder with only the hole, it becomes difficult to insert the rod-shaped solder around the hole, so a guide is provided around the hole, You may make it the cylinder of the same shape.

また作業者に棒状はんだをはんだ槽に投入する際は必ず通過部を通して投入するように指導しても、作業者によっては通過部を通さずに棒状はんだを直接、はんだ槽に投入することも考えられる。つまりはんだ槽は、棒状はんだを投入できる部分は噴流ノズル以外、如何なる部分でも投入できる。そこで棒状はんだを簡単に投入できないように、噴流ノズル以外の部分を投入カバーで覆っておき、投入カバーの一箇所、または複数箇所に棒状はんだを通過させる通過部を設けておくようにしてもよい。このように噴流ノズル以外を投入カバーで覆っておくと、作業者が噴流ノズルから棒状はんだを投入しようと思っても、噴流ノズルの部分は底が浅くて棒状はんだが深く入らず、棒状はんだを溶かしにくくなっているため、作業者は投入しないものである。   In addition, even if the operator is instructed to put the rod-shaped solder into the solder bath through the passage, it is possible that some workers may put the rod-shaped solder directly into the solder bath without passing through the passage. It is done. In other words, the solder tank can be filled with any part other than the jet nozzle where the bar-like solder can be poured. Therefore, in order to prevent the rod-shaped solder from being easily charged, a portion other than the jet nozzle may be covered with a charging cover, and a passage portion through which the rod-shaped solder passes may be provided at one or a plurality of charging covers. . If the cover other than the jet nozzle is covered in this way, even if an operator wants to add bar solder from the jet nozzle, the bottom of the jet nozzle is shallow and the bar solder does not enter deeply. Since it is difficult to melt, the operator does not throw it in.

本発明はんだ槽の第一実施例の斜視図The perspective view of the first embodiment of the solder bath of the present invention 本発明はんだ槽の第二実施例の斜視図The perspective view of the second embodiment of the solder bath of the present invention 鉛フリー棒状はんだと断鉛入り棒状はんだの通過状態を説明する図Diagram explaining the passage of lead-free bar-shaped solder and lead-free bar-shaped solder

符号の説明Explanation of symbols

1 はんだ槽
2 一次噴流ノズル
3 二次噴流ノズル
4 溶融はんだ
5、6ポンプ軸
7 投入板
10 通過部
11 投入カバー
12、13 軸の穴
DESCRIPTION OF SYMBOLS 1 Solder tank 2 Primary jet nozzle 3 Secondary jet nozzle 4 Molten solder 5, 6 Pump shaft 7 Input plate 10 Passing part 11 Input cover 12, 13 Shaft hole

以下、図面に基づいて本発明のはんだ槽を説明する。図1は本発明はんだ槽の第一実施例の斜視図、図2は同第二実施例の斜視図である。     Hereinafter, the solder bath of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of a first embodiment of the solder bath of the present invention, and FIG. 2 is a perspective view of the second embodiment.

先ず本発明はんだ槽の第一実施例について説明する。はんだ槽1には、一次噴流ノズル2と二次噴流ノズル3が設置されており、内部には溶融はんだ4が入れられている。溶融はんだ4の下部には一次噴流ノズル2と二次噴流ノズル3に溶融はんだを送って噴流させるポンプが配置されており、該ポンプには軸5、6が取り付けられている。軸5、6は溶融はんだ4の液面から上方に突出しており、上部に図示しないプーリーが取り付けられていて、該プーリーがやはり図示しないベルトでモーターと連動している。   First, a first embodiment of the solder bath of the present invention will be described. In the solder tank 1, a primary jet nozzle 2 and a secondary jet nozzle 3 are installed, and a molten solder 4 is placed inside. Under the molten solder 4, a pump for sending the molten solder to the primary jet nozzle 2 and the secondary jet nozzle 3 to jet it is arranged, and shafts 5 and 6 are attached to the pump. The shafts 5 and 6 protrude upward from the liquid surface of the molten solder 4, and a pulley (not shown) is attached to the upper portion, and the pulley is also interlocked with the motor by a belt (not shown).

はんだ槽1の上部には、はんだ槽の一部を覆う投入板7が取り付けられている。投入板7の取り付け位置は、一次噴流ノズル2と二次噴流ノズル3の横方で比較的広い空間のある部分である。投入板7には下方に折り曲げられた取り付け部8が形成されており、該取り付け部がはんだ槽1の壁面にビス9で固定されている。投入板7には通過部10の穴が穿設されている。通過部10は、はんだ槽に挿入する鉛フリー棒状はんだFの直交する断面形状が例えば一辺20mmの正三角形であれば、該断面形状よりも少し大きい一辺が22mmの正三角形の穴である。   On the top of the solder bath 1, a charging plate 7 is attached to cover a part of the solder bath. The installation position of the charging plate 7 is a portion having a relatively wide space on the side of the primary jet nozzle 2 and the secondary jet nozzle 3. A mounting portion 8 bent downward is formed on the charging plate 7, and the mounting portion is fixed to the wall surface of the solder tank 1 with screws 9. A hole for the passage portion 10 is formed in the charging plate 7. If the cross-sectional shape of the lead-free rod-like solder F inserted into the solder bath is an equilateral triangle having a side of 20 mm, for example, the passage portion 10 is a regular triangle hole having a side slightly larger than the cross-sectional shape of 22 mm.

次に本発明はんだ槽の第二実施例について説明する。第一実施例と同一箇所には同一符号を付して、その説明は省略する。はんだ槽1の上部には、一次噴流ノズル2と二次噴流ノズル3以外の部分を覆う投入カバー11が配置されている。投入カバー11には取り付け部8が形成されており、ビス9ではんだ槽1の壁面に固定されている。投入カバー11は、軸5、6を挿通する穴12、13が穿設されている。そして投入カバー11は、これらの穴12、13の中心を横切るようにして分割されている。このように投入カバー11を分割したのは、軸5、6の上方にはプーリーやモーターと連動するベルトが取り付けられており、投入カバーが一体のものであると着脱時にプーリーやベルトが邪魔になって穴から抜くことができず、多大な手間がかかるからである。投入カバーを穴12、13を横切って分割しておけば、投入カバーの着脱時、軸の両側から外したり挟むようにしたりするだけで容易に着脱ができる。   Next, a second embodiment of the solder bath of the present invention will be described. The same parts as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted. A charging cover 11 that covers a portion other than the primary jet nozzle 2 and the secondary jet nozzle 3 is disposed on the upper part of the solder tank 1. A mounting portion 8 is formed on the charging cover 11, and is fixed to the wall surface of the solder tank 1 with screws 9. The input cover 11 has holes 12 and 13 through which the shafts 5 and 6 are inserted. The input cover 11 is divided so as to cross the centers of these holes 12 and 13. The input cover 11 is divided in this manner because a belt interlocking with a pulley and a motor is attached above the shafts 5 and 6, and when the input cover is an integral one, the pulley and the belt are obstructed when being attached and detached. This is because it cannot be removed from the hole, and it takes a lot of work. If the input cover is divided across the holes 12 and 13, the input cover can be easily attached / detached by simply removing it from both sides of the shaft or sandwiching the input cover.

投入カバー11の一側、即ち一次噴流ノズル2と二次噴流ノズル3の横方で比較的広い空間のある部分に三個の通過部10、10、10の穴が穿設されている。通過部の形状は、前述実施例と同一である。   Three holes 10, 10, 10 are formed in one side of the charging cover 11, that is, in a portion having a relatively wide space on the side of the primary jet nozzle 2 and the secondary jet nozzle 3. The shape of the passage part is the same as in the previous embodiment.

ここで上記はんだ槽における鉛フリー棒状はんだを供給する方法について説明する。はんだ槽1の一次噴流ノズル2と二次噴流ノズル3から溶融はんだ4を噴流させ、該噴流している溶融はんだに多数のプリント基板を接触させてはんだ付けを行うと、はんだ槽1内の溶融はんだ4はプリント基板に付着するため、徐々に少なくなっていく。そして所定液面高さまで減少すると、図示しない液面センサーがこれを検知して警報を発する。すると、作業者は、はんだ槽1の近傍に置いてある断面形状が正三角形の鉛フリー棒状はんだFを矢印のように上方からはんだ槽1に投入する。この鉛フリー棒状はんだの投入をはんだ槽1に固定された通過部10から必ず行うようにすれば、例えはんだ槽近傍に鉛入り棒状はんだが置いてあって、それを作業者がはんだ槽に投入しようと思っても、鉛入り棒状はんだは通過部を通過しないため、投入されることはない。   Here, a method of supplying lead-free bar-shaped solder in the solder bath will be described. When the molten solder 4 is jetted from the primary jet nozzle 2 and the secondary jet nozzle 3 of the solder bath 1 and a large number of printed circuit boards are brought into contact with the molten solder being jetted, the solder in the solder bath 1 is melted. Since the solder 4 adheres to the printed circuit board, it gradually decreases. When the liquid level is reduced to a predetermined liquid level, a liquid level sensor (not shown) detects this and issues an alarm. Then, the operator puts the lead-free bar-shaped solder F having a regular triangular cross section placed in the vicinity of the solder tank 1 into the solder tank 1 from above as indicated by an arrow. If this lead-free rod-shaped solder is always introduced from the passage 10 fixed to the solder bath 1, for example, a lead-containing rod-shaped solder is placed in the vicinity of the solder bath, and the worker puts it into the solder bath. Even if you want to do it, lead-containing bar-shaped solder does not pass through the passage, so it will not be thrown in.

本発明の実施例では、断面形状が正三角形の鉛フリー棒状はんだを投入するために、通過部が該断面形状と相似形の正三角形のもので説明したが、鉛フリー棒状はんだの断面形状が鉛入り棒状はんだの矩形の断面形状と相違し、しかも鉛入り棒状はんだが通過できない形状であれば如何なる形状の通過部にすることも可能である。
鉛フリー棒状はんだの断面形状としては、台形、半円形、円形、正方形等が考えられる。
In the embodiment of the present invention, in order to introduce lead-free bar-shaped solder having a regular cross-sectional shape, the passage portion has been described as a regular triangle having a cross-sectional shape similar to the cross-sectional shape. It is possible to use a passing portion of any shape as long as it is different from the rectangular cross-sectional shape of the lead-containing bar-shaped solder and the lead-containing bar-shaped solder cannot pass therethrough.
As a cross-sectional shape of the lead-free bar-shaped solder, a trapezoidal shape, a semicircular shape, a circular shape, a square shape, or the like can be considered.

Claims (4)

鉛入り棒状はんだの長手方向に直交する断面形状と同断面形状が相違する鉛フリー棒状はんだをはんだ槽に供給する方法において、はんだ槽の上部には鉛入り棒状はんだは通過させないが、鉛フリー棒状はんだを通過させることができる通過部が形成されており、該通過部から鉛フリー棒状はんだを通過させることにより、はんだ槽に鉛フリー棒状はんだを供給する方法。In the method of supplying lead-free bar-shaped solder, which has a cross-sectional shape different from the cross-sectional shape perpendicular to the longitudinal direction of the lead-containing bar-shaped solder, to the solder bath, lead-free bar-shaped solder is not allowed to pass through the upper part of the solder bath. A method of supplying lead-free bar-shaped solder to a solder bath by forming a passing part through which solder can pass and allowing lead-free bar-shaped solder to pass from the passing part. 溶融はんだにプリント基板を接触させてプリント基板のはんだ付けを行うはんだ槽において、はんだ槽の上部には鉛入り棒状はんだは通過させないが、該鉛入り棒状はんだとは長手方向に直交する断面形状が相違する鉛フリー棒状はんだを通過させることのできる通過部が形成されていることを特徴とするはんだ槽。In a solder bath where the printed circuit board is soldered by bringing the printed circuit board into contact with the molten solder, lead-shaped bar-shaped solder is not allowed to pass through the upper part of the solder tank, but the lead-shaped bar-shaped solder has a cross-sectional shape orthogonal to the longitudinal direction. A solder tank, characterized in that a passage portion through which different lead-free bar-like solder can pass is formed. 前記通過部は、はんだ槽の一部を覆う投入板に形成されていることを特徴とする請求項2に記載のはんだ槽。The solder passage according to claim 2, wherein the passage portion is formed on a charging plate that covers a part of the solder bath. 前記通過部は、噴流ノズル以外のはんだ槽上部を覆う投入カバーに形成されていることを特徴とする請求項2に記載のはんだ槽。  The solder passage according to claim 2, wherein the passage portion is formed in a charging cover that covers an upper portion of the solder bath other than the jet nozzle.
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