JPH11192562A - Electromagnetic welding of metal sheet - Google Patents

Electromagnetic welding of metal sheet

Info

Publication number
JPH11192562A
JPH11192562A JP10294316A JP29431698A JPH11192562A JP H11192562 A JPH11192562 A JP H11192562A JP 10294316 A JP10294316 A JP 10294316A JP 29431698 A JP29431698 A JP 29431698A JP H11192562 A JPH11192562 A JP H11192562A
Authority
JP
Japan
Prior art keywords
plate
coil
current
lower plate
upper plate
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP10294316A
Other languages
Japanese (ja)
Other versions
JP3751153B2 (en
Inventor
Tomokatsu Aizawa
友勝 相澤
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Japan Science and Technology Agency
Original Assignee
Japan Science and Technology Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Japan Science and Technology Corp filed Critical Japan Science and Technology Corp
Priority to JP29431698A priority Critical patent/JP3751153B2/en
Publication of JPH11192562A publication Critical patent/JPH11192562A/en
Application granted granted Critical
Publication of JP3751153B2 publication Critical patent/JP3751153B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • 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
    • B23K20/00Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
    • B23K20/06Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating by means of high energy impulses, e.g. magnetic energy
    • 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
    • B23K2101/00Articles made by soldering, welding or cutting
    • B23K2101/18Sheet panels
    • 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
    • B23K2103/00Materials to be soldered, welded or cut
    • B23K2103/08Non-ferrous metals or alloys
    • B23K2103/10Aluminium or alloys thereof

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Pressure Welding/Diffusion-Bonding (AREA)
  • General Induction Heating (AREA)

Abstract

PROBLEM TO BE SOLVED: To instantaneously execute the similar welding as conventional spot welding or seam welding without using an electrode and to weld an object to be welded incapable of welding or extremely difficult for welding by a conventional method. SOLUTION: An upper plate 5 and a lower plate 6 which are arranged in a facing state are provided in a conductive state, one wind coil A such as a plane shape having a concentration part 7, wherein a concentrated current is made to flow into both or either of the upper plate 5 and the lower plate 6 is provided, is used, and meal sheets which are superposed between or outside the upper plate 5 and the lower plate 6 of the one wind coil A are disposed. The current is made to flow into the one wind coil A, and an eddy current is generated in the superposed metal sheets to weld them by utilizing the law of electromagnetic induction.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は、金属薄板の溶接に
関するもので、平板状形態等の略一巻のコイルを使用
し、アルミニウム薄板および銅薄板等を電極を用いずに
瞬間的に電磁溶接する方法に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to welding of a thin metal plate, and uses a substantially one-turn coil of a flat plate or the like, and instantaneously electromagnetically welds an aluminum thin plate or a copper thin plate without using electrodes. On how to do it.

【0002】[0002]

【従来の技術】金属薄板の接合法として、図10に示す
ような先端を適当に形成した電極の先端で挟み電流及び
加圧力を集中して抵抗溶接するスポット溶接法といわれ
る方法が一般的に使用されている。溶接機としての主な
構成要素は、電源1、スイッチ2、電極3である。重ね
た金属薄板4の上下に電極3を置いて加圧し、スイッチ
2を閉じ、電極3を通じて電流を集中して流せば、電極
付近の金属薄板部分は、金属板材の電気抵抗によって生
じるジュール熱で溶融し接合する。比較的大きな電流を
短時間通電して溶接するのが一般的である。また、原理
的にはスポット溶接と同じであるが、電極として回転電
極を用い、回転電極を加圧および回転させながら電流を
流すシーム溶接法といわれる方法も使用されている。
2. Description of the Related Art As a joining method of a thin metal plate, a method called spot welding, in which current and pressure are concentrated and resistance welding is performed by sandwiching a tip between appropriately formed electrodes as shown in FIG. 10, is generally used. in use. The main components of the welding machine are a power supply 1, a switch 2, and an electrode 3. When the electrodes 3 are placed above and below the stacked metal sheets 4 and pressurized, the switch 2 is closed, and current is concentrated through the electrodes 3, the metal sheet portions near the electrodes are heated by Joule heat generated by the electric resistance of the metal sheet material. Melt and join. Generally, welding is performed by applying a relatively large current for a short time. In addition, although it is the same as spot welding in principle, a method called a seam welding method in which a rotating electrode is used as an electrode and current is applied while applying pressure and rotating the rotating electrode is also used.

【0003】[0003]

【発明が解決しようとする課題】図10に示す従来のス
ポット溶接法では、板材がアルミニウム等の場合、溶融
温度は低いが、熱伝導度、電気導電率が高いため、溶接
するのにさらに大きな電流を流す必要がある。また溶接
の際、電極先端部へアルミニウムが溶着し易い等の欠点
がある。このため、溶接時間が短く、多量生産に適して
いるというスポット溶接の特長が損なわれる。
In the conventional spot welding method shown in FIG. 10, when the plate is made of aluminum or the like, the melting temperature is low, but the thermal conductivity and the electrical conductivity are high, so that the welding is more difficult. It is necessary to pass current. Further, at the time of welding, there is a disadvantage that aluminum is easily welded to the tip of the electrode. For this reason, the feature of spot welding that the welding time is short and suitable for mass production is impaired.

【0004】また電極を使用せず金属板に電流を流して
溶接する方法もある。ソレノイドコイルやスパイラルコ
イルを使用し、電磁誘導の法則を利用して、金属板にう
ず電流を流して加熱する方法が考えられる。しかし、局
所的な溶接を行うのは困難であり、局所的な溶接法とし
ては実用化されていない。ソレノイドコイルやスパイラ
ルコイルの巻線を細く、大きさを小さくし、局所的な溶
接を行なおうとすると、大電流が流れるため、コイルが
破損するからである。
[0004] There is also a method of welding by passing an electric current to a metal plate without using an electrode. A method of using a solenoid coil or a spiral coil and applying an eddy current to a metal plate and heating by utilizing the law of electromagnetic induction is considered. However, it is difficult to perform local welding, and it has not been practically used as a local welding method. This is because if the windings of the solenoid coil or the spiral coil are made thinner and smaller in size and local welding is performed, a large current flows and the coil is damaged.

【0005】本発明は、以上の従来法の欠点を解決する
もので、電極を使用せずに、強固なコイルを使用し、従
来のスポット溶接やシーム溶接と同様の溶接を瞬間的に
行うことを可能とするのが課題である。
The present invention solves the above-mentioned drawbacks of the conventional method, and uses a strong coil without using an electrode and instantaneously performs welding similar to conventional spot welding or seam welding. The challenge is to make it possible.

【0006】[0006]

【課題を解決するための手段】本発明は、鋼鉄や銅合金
等の導体からなる強固な平板状形態等の一巻コイルを用
い、該一巻コイルに放電電流からなる大電流を瞬間的に
流すようにするものである。すなわち、第1に、本発明
は、対向状態に配する上板と下板とを導通状態に設け、
この上板と下板の双方若しくは一方に電流が集中して流
れる集中部を設けた平板状コイルを使用し、この平板状
コイルの上板と下板との間に、重ね配設した金属薄板を
配設し、この平板状コイルに電流を流し、電磁誘導の法
則を利用して、前記重ね配設した金属薄板にうず電流を
生じさせてこの重ねた金属薄板を溶接することを特徴と
する金属薄板の電磁溶接法に係わるものである。
SUMMARY OF THE INVENTION The present invention uses a single-turn coil, such as a rigid flat plate made of a conductor such as steel or copper alloy, and instantaneously applies a large current consisting of a discharge current to the one-turn coil. It is intended to flow. That is, first, in the present invention, the upper plate and the lower plate arranged in the facing state are provided in a conductive state,
Using a flat coil provided with a concentrated portion where current flows in a concentrated manner on both or one of the upper plate and the lower plate, and a thin metal plate disposed between the upper plate and the lower plate of the flat coil. Is disposed, a current is caused to flow through the plate-shaped coil, and by utilizing the law of electromagnetic induction, an eddy current is generated in the superposed metal sheet and the superposed metal sheet is welded. The present invention relates to an electromagnetic welding method for metal sheets.

【0007】より具体的には、本発明は、前記上板およ
び下板の夫々の略中央部分に板幅を狭くして上板および
下板を流れる電流が集中して流れる前記集中部を構成
し、この上板および下板に設けた集中部を対向位置に設
け、前記上板および下板との間に配した前記重ね配設し
た金属薄板に前記集中部で発生した磁束を交差させてこ
の金属薄板にうず電流を生じさせるように構成したこと
を特徴とする請求項1記載の金属薄板の電磁溶接法に係
わるものである。
More specifically, according to the present invention, the concentrating portion is formed such that a current flowing through the upper plate and the lower plate is concentrated at a substantially central portion of each of the upper plate and the lower plate so that a current flowing through the upper plate and the lower plate flows. The concentrated portions provided on the upper plate and the lower plate are provided at opposing positions, and the magnetic flux generated at the concentrated portion intersects the superposed thin metal plate disposed between the upper plate and the lower plate. The method according to claim 1, wherein an eddy current is generated in the metal sheet.

【0008】そして、本発明は、前記平板状コイルの上
板若しくは下板の形状を変更して、前記上板および下板
との間に重ね配設した異種の金属薄板を溶接することを
特徴とする請求項1、2いずれか1項に記載の金属薄板
の電磁溶接法に係わるものである。
[0008] The present invention is characterized in that the shape of the upper plate or the lower plate of the flat coil is changed, and different kinds of thin metal plates arranged and superposed between the upper plate and the lower plate are welded. The present invention relates to an electromagnetic welding method for a metal sheet according to any one of claims 1 and 2.

【0009】また、第2に、本発明は、対向状態に配す
る上板と下板とを導通状態に設け、この上板と下板の一
方に電流が集中して流れる集中部を設けた平板状コイル
を使用し、このコイルの前記集中部を設けた上板もしく
は下板の外側に、重ね配設した金属薄板を配設し、この
平板状コイルに電流を流し、電磁誘導の法則を利用し
て、前記重ね配設した金属薄板にうず電流を生じさせて
この重ねた金属薄板を溶接することを特徴とする金属薄
板の電磁溶接法に係わるものである。
Second, according to the present invention, an upper plate and a lower plate which are arranged to face each other are provided in a conductive state, and a concentrated portion in which a current flows in one of the upper plate and the lower plate is provided. A flat-plate coil is used, and a thin metal plate is arranged outside the upper plate or the lower plate provided with the concentrated portion of the coil, and a current is applied to the flat-plate coil. The present invention relates to a method for electromagnetically welding thin metal sheets, wherein an eddy current is generated in the stacked thin metal sheets and the stacked thin metal sheets are welded.

【0010】より具体的には、本発明は、前記平板状コ
イルの上板若しくは下板の一方の略中央部分に板幅を狭
くして上板若しくは下板を流れる電流が集中して流れる
前記集中部を構成し、この集中部を設けた上板若しくは
下板の外側に配した前記重ね配設した金属薄板に前記集
中部で発生した磁束を交差させてこの金属薄板にうず電
流を生じさせるように構成したことを特徴とする請求項
4記載の金属薄板の電磁溶接法に係わるものである。上
記の各方法において、金属薄板の接合面に低融点で高導
電率の金属薄板を介在させることもできる。
More specifically, according to the present invention, the current flowing through the upper plate or the lower plate is concentrated on one of the upper plate or the lower plate of the flat coil and the current flowing through the upper plate or the lower plate is concentrated. A concentrated portion is formed, and a magnetic flux generated in the concentrated portion intersects the superposed thin metal plate disposed outside the upper plate or the lower plate provided with the concentrated portion to generate an eddy current in the thin metal plate. According to a fourth aspect of the present invention, there is provided a method for electromagnetically welding thin metal sheets. In each of the above methods, a metal sheet having a low melting point and a high electrical conductivity may be interposed on the joining surface of the metal sheet.

【0011】さらに、第3に、本発明は、電流が集中し
て流れる集中部を設けた平板状の一巻コイル、細幅の長
い導体板をコの字型に形成したコの字型の一巻コイル、
または細幅の長い導体部と広幅の導体部を有する平板状
の一枚板の一巻コイルと、該コイルに放電電流を流すよ
うに該コイルの両端部に設けた電流インプット部とアウ
トプット部にスイッチを介して放電電源を電気的に接続
してなることを特徴とする電磁溶接装置に係わるもので
ある。
Thirdly, the present invention relates to a flat one-turn coil provided with a concentrated portion through which a current flows in a concentrated manner, and a U-shape formed by forming a long narrow conductive plate into a U-shape. One-turn coil,
Alternatively, a single-turn coil having a flat plate shape having a narrow conductor portion and a wide conductor portion, and a current input portion and an output portion provided at both ends of the coil so that a discharge current flows through the coil. The present invention relates to an electromagnetic welding apparatus characterized in that a discharge power supply is electrically connected to a power source via a switch.

【0012】上記電磁溶接装置において、平板状の一巻
コイルの電流が集中して流れる集中部を細幅の円形状導
体板により形成することができる。また、コの字型の一
巻コイルを断面円形の導線を横長に並べた平板状の集合
導線により形成することができる。また、コの字型の一
巻コイルを複数個並列または交差して並べて配置するこ
とができる。各コイルの一部には磁束遮断板を設けるこ
ともできる。
In the above-mentioned electromagnetic welding apparatus, the converging portion in which the current of the flat one-turn coil flows in a concentrated manner can be formed by a narrow circular conductor plate. Further, the U-shaped one-turn coil can be formed by a flat plate-shaped collective wire in which conductive wires having a circular cross section are arranged horizontally long. In addition, a plurality of U-shaped single-turn coils can be arranged in parallel or crosswise. A magnetic flux shielding plate may be provided on a part of each coil.

【0013】さらに、本発明の上記した方法は、溶接し
た薄板を剥がす方法にも適用できる。すなわち、第4
に、本発明は、低融点で高導電率の金属薄板を少なくと
も2枚の薄板の間に介在させて溶接した溶接物を、請求
項7記載の装置の平板状の一巻コイルの上板と下板との
間、または細幅の長い導体板をコの字型に形成したコの
字型の一巻コイルの上板と下板との間、あるいは上下に
設けた一枚板の一巻コイルの上下間に配設し、コイルに
電流を徐々に流して急激に遮断し、電磁誘導の法則を利
用して、前記配設した溶接物にうず電流を生じさせて接
合部分をジュール熱により加熱溶融するとともに高密度
の磁束による電磁力が該部分を離す方向に働くようにす
ることを特徴とする薄板からなる溶接物を剥がす方法に
係わるものである。
Further, the above-described method of the present invention can be applied to a method of peeling a welded thin plate. That is, the fourth
Further, the present invention provides a welded product obtained by interposing a low-melting-point, high-conductivity metal thin plate between at least two thin plates and welding the flat plate-shaped single-turn coil upper plate of the apparatus according to claim 7. Between a lower plate, or a U-shaped one-turn coil in which a long narrow conductor plate is formed in a U-shape, between an upper plate and a lower plate of the coil, or one turn of a single plate provided vertically. Arranged between the upper and lower coils, the current gradually flows through the coil, suddenly cuts off, and utilizes the law of electromagnetic induction to generate an eddy current in the arranged welded article, and the joint portion is heated by Joule heat. The present invention relates to a method for peeling a welded product made of a thin plate, wherein the welding is performed by heating and melting and an electromagnetic force by a high-density magnetic flux acts in a direction to separate the portion.

【0014】本発明の方法は、アルミニウム薄板や銅薄
板等の金属薄板同士の溶接に好適である。また、絶縁材
上に金属ラミネートされた様な薄板材同士またはこれと
金属薄板との溶接等の抵抗溶接困難な材料も溶接でき、
さらに低融点金属薄板のようにこれまでの溶接法では、
溶け過ぎてしまうため、溶接が困難であった薄板も、本
発明の方法では、磁束やうず電流の状態を制御すれば、
溶け過ぎることなく、瞬間的に溶接できる。また、電流
集中部の形状に対応して、長いシーム状の接合部も瞬間
的に溶接できる。
The method of the present invention is suitable for welding metal sheets such as aluminum sheets and copper sheets. In addition, it is possible to weld materials that are difficult to perform resistance welding, such as welding between thin metal materials such as metal-laminated on an insulating material or a thin metal plate with the same,
In addition, in the past welding methods like low melting metal sheets,
Because it melts too much, even for thin plates that were difficult to weld, in the method of the present invention, if the state of magnetic flux and eddy current is controlled,
It can be welded instantaneously without excessive melting. In addition, a long seam-like joint can be instantaneously welded in accordance with the shape of the current concentration part.

【0015】強固な平板状の一巻コイルを用いる場合、
平板状コイルへ電流が急激に流れると、このコイルの上
板、下板の電流が集中して流れる部分(電流集中部)に
高密度の磁束(磁束密度B)が急激に発生する。上板と
下板の間に重ねた金属薄板(導電率k)が置いてあれ
ば、発生した磁束は金属薄板に交差する。この結果、薄
板には、うず電流(電流密度i)が流れ、電磁力(i×
B)が働く。うず電流が流れる部分には、ジュール熱
(i2 /k)が発生するので、この部分は軟化温度また
は融点まで短時間で加熱され、かつ短時間で冷却され
る。電流の大きさ、磁束の時間的な変化率、電磁力の大
きさ、接合面の状態等が適当であれば、薄板は溶接され
る。この現象は、強固な細幅の長い導体板をコの字型に
形成した形態のコの字型の一巻コイル、または強固な細
幅の長い導体部と広幅の導体部を有する形態の平板状の
一枚板の一巻コイルを用いた場合も同様である。
In the case of using a solid flat single-turn coil,
When a current suddenly flows through the flat coil, a high-density magnetic flux (magnetic flux density B) is rapidly generated in a portion (current concentrated portion) of the upper plate and the lower plate of the coil where the current flows in a concentrated manner. If a superposed thin metal plate (conductivity k) is placed between the upper plate and the lower plate, the generated magnetic flux intersects the thin metal plate. As a result, an eddy current (current density i) flows through the thin plate, and an electromagnetic force (i ×
B) works. Since Joule heat (i 2 / k) is generated in the portion where the eddy current flows, this portion is heated to the softening temperature or melting point in a short time and cooled in a short time. If the magnitude of the current, the rate of change of the magnetic flux over time, the magnitude of the electromagnetic force, the condition of the joint surface, etc. are appropriate, the thin plate is welded. This phenomenon is caused by a U-shaped single-turn coil in which a strong, narrow, long conductor plate is formed in a U-shape, or a flat plate, which has a strong, narrow, long conductor portion and a wide, conductor portion. The same applies to the case where a single-turn coil having a shape of one plate is used.

【0016】被溶接物にうず電流を生じさせて接合部分
をジュール熱により加熱溶融するとともに高密度の磁束
による電磁力が該部分を圧する方向に働くようにするの
に十分な大電流を急激にコイルに流すための放電電源と
しては、例えば、コンデンサ電源を用いて放電ギャツプ
スイッチを閉じて電流を流すようにすればよい。具体的
には、コンデンサ電源50〜200μF、電圧5〜15
kVに充電し、放電ギャツプスイッチを閉じてコイルに
放電して、波高値10kA以上、この電流値までの立上
がり時間10μs以内であり、電流の流れている時間が
100μs以内の電流を流すとよい。大電流を急激に流
した後途中で急激に遮断すると、うず電流の流れが急に
変わり、この結果、電磁力が圧力として作用しなくなる
が、放電電流は急激ではなく、減衰振動のようにゆっく
りと減る。
An eddy current is generated in the work to be welded to heat and melt the joint by Joule heat, and at the same time, a large current sufficient to cause the electromagnetic force due to the high-density magnetic flux to act in a direction to press the part is applied. As a discharge power supply for flowing through the coil, for example, a capacitor power supply may be used to close the discharge gap switch to allow current to flow. Specifically, a capacitor power supply 50 to 200 μF, a voltage 5 to 15 μF
It is preferable to charge the battery to kV, close the discharge gap switch, discharge the coil, discharge a current having a peak value of 10 kA or more, a rise time up to this current value within 10 μs, and a current flowing time of 100 μs or less. If a large current suddenly flows and then suddenly cuts off halfway, the flow of the eddy current will change suddenly, and as a result, the electromagnetic force will no longer act as pressure. And decrease.

【0017】強固なコイルを構成する導体板としては強
度、耐久性の点では鋼鉄製が望ましく、その他、導電
率、強度の大きな銅合金等が適する。導体板は絶縁材料
等で補強してもよい。電流が集中する部分の幅は、集中
部を構成する導体板の断面形状、導電率、電流値、被溶
接薄板の種類、厚み等により異なるが、数ミリ〜十数ミ
リ、実用的には5〜10mm程度が好ましい。また、該
導体板の厚さは、実用的には2〜5mm程度が好まし
い。導体板は絶縁して用いるか、導体板と金属薄板との
間に絶縁シートを挟んで締付金具等を用いて固定して絶
縁してもよい。
As a conductor plate constituting a strong coil, steel is desirable in terms of strength and durability, and a copper alloy or the like having high conductivity and strength is suitable. The conductor plate may be reinforced with an insulating material or the like. The width of the portion where the current is concentrated differs depending on the cross-sectional shape, conductivity, current value, type and thickness of the thin plate to be welded, etc. It is preferably about 10 to 10 mm. Further, the thickness of the conductor plate is practically preferably about 2 to 5 mm. The conductor plate may be used insulated, or may be fixed and insulated using a fastener or the like with an insulating sheet interposed between the conductor plate and the thin metal plate.

【0018】電流が集中する部分の幅や数等を上板と下
板とで変え、そこに流れる電流の大きさをそれぞれ変化
させれば、異種の金属薄板に流れるうず電流等もそれぞ
れ異なる。これは、融点の異なる金属(例えば、アルミ
ニウムと銅)薄板の溶接に向いている。融点の高い金属
板側の集中部により大きな電流を流すようにすれば、融
点の異なる両金属を同じ溶融状態にして溶接することが
できる。導体板の幅を変えずに、厚さを厚くすると、大
電流を流したとき、導体板で発生する磁束のうち溶接に
有効な磁束の密度は小さくなる。異種金属薄板の融点の
違いに応じて上下の導体板の厚さをそれぞれ変え、異種
金属薄板を挟み、異種金属薄板を同じ軟化状態にして溶
接することもできる。
If the width and number of the portions where the current is concentrated are changed between the upper plate and the lower plate, and the magnitudes of the currents flowing therethrough are respectively changed, the eddy currents flowing through the different types of metal thin plates are also different. This is suitable for welding metal sheets having different melting points (for example, aluminum and copper). If a larger current is applied to the concentrated portion on the metal plate side having a higher melting point, both metals having different melting points can be welded in the same molten state. If the thickness is increased without changing the width of the conductor plate, the density of the magnetic flux effective for welding among the magnetic fluxes generated in the conductor plate when a large current flows is reduced. The thicknesses of the upper and lower conductor plates may be changed according to the difference in melting point of the dissimilar metal sheets, and the dissimilar metal sheets may be sandwiched, and the dissimilar metal sheets may be welded in the same softened state.

【0019】本発明の方法では、被溶接物の接合面に低
融点で高導電率の金属薄板を介在させることができる。
2枚の同じ種類の金属または合金薄板の間に合金を形成
しやすい導電率が大きく、融点の低い純金属の極薄板を
挟み、これら3層をコイルの内側に挟んで配置するか外
側に配置してコイルに放電電流を流す。このとき、うず
電流が流れやすく、融点の低い純金属薄板が溶けて、2
枚の金属または合金薄板を溶接できる。
In the method of the present invention, a low-melting-point, high-conductivity metal sheet can be interposed on the joint surface of the workpiece.
An ultra-thin metal sheet with a high conductivity and a low melting point is sandwiched between two thin sheets of the same kind of metal or alloy, and these three layers are placed inside or outside the coil. And a discharge current is passed through the coil. At this time, an eddy current flows easily, and the pure metal sheet having a low melting point is melted.
Two metal or alloy sheets can be welded.

【0020】溶接した薄板を剥がす場合、具体的には、
溶接した金属薄板類を本件発明の溶接方法の実施の形態
と同様にコイルの間に挟んで配置する。ただし、導体板
間の距離を少し大きくする。まず、コイルにゆっくりと
溶接時の百倍程度の時間(ただしμsのオーダ)をかけ
て波高値で10kA以上の大電流を流す。このとき、う
ず電流はほとんど流れない。次に、該大電流を10μs
以内で急激に遮断する。このとき、純金属薄板を挟んだ
金属または合金薄板にうず電流が流れる。大電流の遮断
時は電流と磁束が減少するので、このうず電流は溶接時
と逆方向に流れ、金属薄板間に溶接されていた純金属薄
板が溶ける。同時に働く電磁力は、金属または合金薄板
同士を離す方向に働く。この結果、溶接された金属また
は合金薄板は接合部から剥がれる。
When peeling the welded thin plate, specifically,
The welded metal sheets are sandwiched and arranged between the coils as in the embodiment of the welding method of the present invention. However, the distance between the conductor plates is slightly increased. First, a large current having a peak value of 10 kA or more is passed through the coil slowly over about 100 times as long as the time of welding (on the order of μs). At this time, almost no eddy current flows. Next, the large current was set to 10 μs
Cut off sharply within. At this time, an eddy current flows through the metal or alloy sheet sandwiching the pure metal sheet. When a large current is interrupted, the current and the magnetic flux decrease, so that the eddy current flows in a direction opposite to that at the time of welding, and the pure metal sheet welded between the metal sheets melts. The electromagnetic force acting simultaneously acts in a direction to separate the metal or alloy thin plates. As a result, the welded metal or alloy sheet is peeled from the joint.

【0021】[0021]

【発明の実施の形態】以下に、本発明を実施する際のコ
イルの構造、コイルと被溶接物の配置等について、具体
例に基づいて説明する。 第1の実施の形態 図1は、平板状の一巻コイルAの一例であり、(a)は
側面図、(b)は上板または下板の平面図である。この
第1の実施の形態の方法は、放電電流を上板と下板で往
復で有効に利用できるので、上板か下板のどちらかを主
に利用する第2の実施の形態の方法よりエネルギー効率
がよい。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of a coil and the arrangement of a coil and an object to be welded when implementing the present invention will be described below based on specific examples. 1st Embodiment FIG. 1 is an example of a flat-plate one-turn coil A, (a) is a side view, and (b) is a plan view of an upper plate or a lower plate. According to the method of the first embodiment, the discharge current can be effectively used in reciprocation between the upper plate and the lower plate. Therefore, the method of the second embodiment mainly uses either the upper plate or the lower plate. Energy efficient.

【0022】溶接機としての主な構成要素は、放電電源
1、スイッチ2、上板5、下板6である。上板5および
下板6は片方の端で接続されており、コイルAとなって
いる。実際の場合、このコイルAは周囲に絶縁シートが
張られ、上下方向から締付金具等を用いて固定される。
上板5および下板6には、板幅を狭くして電流を板中央
付近に集中して流す部分(電流集中部7)が設けてあ
る。溶接する金属薄板4は、重ねて図1のようにコイル
上板5と下板6の間に置かれる。スイッチ2を閉じれ
ば、絶縁されたコイルAへ短時間に大きな電流が流れ
る。電流が集中する部分7以外のところ(電源1、スイ
ッチ2および接続部分を含む)では、できる限り電流を
幅広に流して電流を流れやすくすると、少ない電源エネ
ルギーで効率よく溶接できる。
The main components of the welding machine are a discharge power source 1, a switch 2, an upper plate 5, and a lower plate 6. The upper plate 5 and the lower plate 6 are connected at one end to form a coil A. In an actual case, the coil A is covered with an insulating sheet, and is fixed from above and below using a fastener.
The upper plate 5 and the lower plate 6 are provided with a portion (a current concentration portion 7) in which the width of the plate is reduced and current is concentrated and flows near the center of the plate. The thin metal plates 4 to be welded are superposed and placed between the coil upper plate 5 and the lower plate 6 as shown in FIG. When the switch 2 is closed, a large current flows to the insulated coil A in a short time. At locations other than the portion 7 where the current is concentrated (including the power source 1, the switch 2, and the connection portion), if the current is made to flow as wide as possible to make the current easier to flow, welding can be performed efficiently with less power source energy.

【0023】また、上板5および下板6の電流集中部7
の大きさや形状を変え、磁束が発生する範囲を制御すれ
ば、溶接面積を変化させることができる。また、電流集
中部7は、板中央付近でなくてもよいし、別々に離れて
2箇所以上あってもよい。
The current concentrating portions 7 of the upper plate 5 and the lower plate 6
The welding area can be changed by changing the size and the shape of the steel and controlling the range in which the magnetic flux is generated. In addition, the current concentrating portions 7 need not be located near the center of the plate, and may be separately separated at two or more locations.

【0024】図2は、図1の電流集中部7の大きさを変
え、電流集中部7の長さを長くした平板状の一巻コイル
Aの一例であり、(a)は上板の平面図、(b)は側面
図、(c)は下板の平面図である。重ねた金属薄板はコ
イル上板5と下板6の電流集中部7の間に置かれる。
FIG. 2 shows an example of a flat, single-turn coil A in which the size of the current concentrating portion 7 in FIG. 1 is changed and the length of the current concentrating portion 7 is increased. (B) is a side view, and (c) is a plan view of a lower plate. The stacked metal sheets are placed between the current concentrating portions 7 of the coil upper plate 5 and the lower plate 6.

【0025】図3は、図1の電流集中部7の形状を変
え、電流集中部7を円形状とした平板状の一巻コイルA
の一例であり、(a)は上板の平面図、(b)は側面
図、(c)は下板の平面図である。コイルAは、両側の
広幅部に接続した上下の細幅で長い電流集中部を途中で
2つに分岐した後、合流する円形状にしたものを使用す
る。このコイルAの上板と下板で金属薄板の重ねた部分
を挟み、コイルAに大電流を流せば、分岐した部分のほ
ぼ円形状に溶接部が形成できる。電流の分岐点近くで溶
接が不完全な場合には、コイルAを円の中心を軸に約9
0°回転させ、コイルAに再度大電流を流して重ね溶接
すればよい。円形状に閉じて溶接することができる。ま
た、金属薄板の片側にコイルAを置き、円形状に閉じて
溶接することもできる。
FIG. 3 is a plan view of a single-turn coil A in which the shape of the current concentrating portion 7 in FIG.
(A) is a plan view of an upper plate, (b) is a side view, and (c) is a plan view of a lower plate. As the coil A, a circular shape is used in which the upper and lower narrow and long current concentrating portions connected to the wide portions on both sides are branched into two in the middle and then merged. If a large current is applied to the coil A by sandwiching the superposed portion of the thin metal plate between the upper plate and the lower plate of the coil A, a welded portion can be formed in a substantially circular shape at the branched portion. If welding is incomplete near the branch point of the current, coil A should be moved about 9
The lap welding may be performed by rotating the coil A by 0 ° and supplying a large current to the coil A again. Can be welded closed in a circular shape. Alternatively, the coil A can be placed on one side of a thin metal plate, closed in a circular shape, and welded.

【0026】第2の実施の形態 図4は、図1の下板の形状を変えた平板状の一巻コイル
Aの一例であり、(a)は側面図、(b)は下板の平面
図である。また、図5も同様に、図2の下板の形状を変
えた平板状の一巻コイルAの一例であり、(a)は上板
の平面図、(b)は側面図、(c)は下板の平面図であ
る。このコイルAの上板5は、第1の実施の形態の図
1、図2とそれぞれ同様である。下板6には中央付近に
穴9があけられ、電流が中央部分に流れないようになっ
ている。コイルAの周囲には絶縁シ一卜が張られてい
る。溶接する金属薄板4は、重ねて図4のように上板5
の外側に置かれる。コイルAと金属薄板4を締付金具等
で固定し、スイッチ2を閉じ、コイルAへ大電流を短時
間に流せば、電流が集中する部分7の周囲に高密度の磁
束(磁束密度B)が急激に発生する。この磁束は金属薄
板4(導電率k)に交差する。この結果、金属薄板4は
軟化溶融点まで加熱されて溶接される。高密度磁束の発
生を妨げないように、コイルの下板6には穴9があけら
れているので効果的である。この第2の実施の形態の方
法は、金属薄板の両側に上板、下板を設置できない場合
に適する。
Second Embodiment FIGS. 4A and 4B show an example of a flat one-turn coil A in which the shape of the lower plate of FIG. 1 is changed, wherein FIG. 4A is a side view, and FIG. FIG. Similarly, FIG. 5 shows an example of a flat-plate one-turn coil A in which the shape of the lower plate in FIG. 2 is changed, (a) is a plan view of the upper plate, (b) is a side view, and (c). Is a plan view of the lower plate. The upper plate 5 of the coil A is the same as in FIGS. 1 and 2 of the first embodiment. A hole 9 is formed near the center of the lower plate 6 so that current does not flow to the center. An insulating sheet is provided around the coil A. The metal sheets 4 to be welded are stacked on each other as shown in FIG.
Placed outside. If the coil A and the metal thin plate 4 are fixed with a clamp or the like, the switch 2 is closed, and a large current is applied to the coil A in a short time, a high-density magnetic flux (magnetic flux density B) around the portion 7 where the current is concentrated. Occurs rapidly. This magnetic flux crosses the metal sheet 4 (conductivity k). As a result, the metal sheet 4 is heated to the softening melting point and welded. A hole 9 is formed in the lower plate 6 of the coil so as not to hinder the generation of high-density magnetic flux, which is effective. The method according to the second embodiment is suitable when the upper plate and the lower plate cannot be installed on both sides of the thin metal plate.

【0027】第3の実施の形態 図6は、電流集中部の形状を変えて、細幅の長い導体板
をコの字型に形成した形態のコの字型の一巻コイルCと
金属薄板の配置の一例であり、(a)は斜視図、(b)
は平面図、(c)は電流の方向と垂直な断面図である。
電流集中部を構成する導体板の電流に垂直な断面は、横
長の長方形であるとコイルCのインダクタンスを下げ、
大電流が急激に流れやすくなる。平板状の集合導線は柔
軟性があるので、金属薄板自体がゆるやかに曲がってい
る場合に使用するとき便利である。また、平板状の集合
導線をゆるやかに曲げて、その曲線に沿って溶接部を形
成することもできる。溶接する金属薄板4は、重ねて上
下の導体板11の間に置かれる。コイルCと金属薄板4
を締付金具等で固定し、スイッチ2を閉じ、コイルCへ
大電流を短時間に流せば、高密度の磁束が急激に発生
し、この磁束は(c)に示すように、金属薄板4に交差
する。この結果、金属薄板4は軟化溶融点まで加熱され
て溶接される。この一巻コイルCは、金属薄板とプラス
チックス製シート等の融着できる材料相互の溶接、低融
点金属薄板、絶縁材上に金属ラミネートされた材料、溶
融温度の低い導電性プラスチックシート等と金属薄板の
ような従来法では溶接不可能か非常に困難な金属薄板の
溶接にも適する。
Third Embodiment FIG. 6 shows a U-shaped single-turn coil C in which a narrow conductor plate is formed in a U-shape by changing the shape of a current concentrating portion and a metal thin plate. (A) is a perspective view, (b)
Is a plan view, and (c) is a sectional view perpendicular to the direction of current.
When the cross section perpendicular to the current of the conductor plate constituting the current concentrating part is a horizontally long rectangle, the inductance of the coil C is reduced,
Large currents flow easily. Since the flat-shaped collective conductor is flexible, it is convenient when used when the thin metal plate itself is bent gently. In addition, a flat plate-shaped collective conductor can be bent gently to form a weld along the curve. The thin metal plates 4 to be welded are placed between the upper and lower conductor plates 11 in an overlapping manner. Coil C and metal sheet 4
When the switch 2 is closed and a large current is applied to the coil C in a short time, a high-density magnetic flux is rapidly generated, and this magnetic flux is generated as shown in FIG. Intersect with As a result, the metal sheet 4 is heated to the softening melting point and welded. This single-turn coil C is made of a weldable material such as a thin metal plate and a plastics sheet, a low-melting metal thin plate, a material laminated on an insulating material, a conductive plastic sheet having a low melting temperature, and a metal. It is also suitable for welding metal sheets that are impossible or very difficult to weld by conventional methods such as sheet metal.

【0028】図7は、上記の図6の細幅で長い導体板か
らなるコの字型の一巻コイルCを複数個平行に並べた一
例であり、(a)は平面図、(b)は側面図である。各
コイルCを直列または並列に接続する。これらのコイル
Cは全体でーつのコイルを構成する。このコイルに大電
流を流せば、重ねた金属薄板4の複数箇所の溶接を同時
に行うことができる。また、コイルCを交差させて並べ
てもよい。コイルCを交差させて並べる場合は、コイル
導体板が互いに交差する位置に対応する被溶接部の溶接
を確実にするため、コイルCを構成する導体板の交差部
分に、電流の流れる方向に細いスリットを多数設けると
よい。こうすれば、導体板の重なった部分の導体板自体
にうず電流が流れるのを防ぐことができる。この一巻コ
イルCを水平面内で自由に移動できるようにすることも
できる。
FIGS. 7A and 7B show an example in which a plurality of U-shaped single-turn coils C made of the narrow and long conductor plate shown in FIG. 6 are arranged in parallel, FIG. 7A is a plan view, and FIG. Is a side view. Each coil C is connected in series or in parallel. These coils C constitute one coil as a whole. If a large current is applied to this coil, welding of a plurality of portions of the stacked metal thin plates 4 can be performed simultaneously. Further, the coils C may be arranged so as to cross each other. When the coils C are arranged so as to intersect with each other, in order to ensure the welding of the welded portions corresponding to the positions where the coil conductor plates intersect with each other, a thin portion is provided in the intersection of the conductor plates constituting the coil C in the direction in which current flows. It is good to provide many slits. With this configuration, it is possible to prevent an eddy current from flowing through the conductor plate itself in the portion where the conductor plates overlap. The single-turn coil C can be freely moved in a horizontal plane.

【0029】図8は、図6、図7に示すコの字型の一巻
コイルCに磁束遮断板を設けたものであり、(a)は平
面図、(b)は側面図である。細幅の長いコの字型導体
板11の内側の一部に絶縁された薄い磁束遮断板13を
取付ける。磁束遮断板13は、導電率の極めて高い材質
で作られている。このコイルCに大電流を流すと、発生
する磁束は、磁束遮断板で遮断され、コイルCの内側に
浸透しない。
FIGS. 8A and 8B show a U-shaped single-turn coil C shown in FIGS. 6 and 7 in which a magnetic flux shielding plate is provided. FIG. 8A is a plan view, and FIG. 8B is a side view. The insulated thin magnetic flux shielding plate 13 is attached to a part of the inside of the narrow and long U-shaped conductor plate 11. The magnetic flux blocking plate 13 is made of a material having extremely high conductivity. When a large current flows through the coil C, the generated magnetic flux is blocked by the magnetic flux blocking plate and does not permeate inside the coil C.

【0030】このコイルCを使用して溶接すると、磁束
遮断板13のある所は溶接されない。磁束遮断板13の
ない場所だけ溶接される。磁束遮断板13をとびとびに
取付けたコイルCで溶接すれば、点線状に長く溶接でき
る。また、磁束遮断板13の導電率や板厚を選べば、磁
束を遮断する割合を自由に変えることができる。この場
合、磁束遮断板13は磁束を制御する磁束制御板13と
して作用する。
When welding is performed using the coil C, a portion where the magnetic flux shielding plate 13 is present is not welded. Welding is performed only at places where there is no magnetic flux blocking plate 13. If the magnetic flux shielding plate 13 is welded with the coil C attached discretely, it can be welded long in a dotted line. Further, if the conductivity and the thickness of the magnetic flux blocking plate 13 are selected, the ratio of blocking the magnetic flux can be freely changed. In this case, the magnetic flux blocking plate 13 acts as a magnetic flux control plate 13 for controlling magnetic flux.

【0031】さらに、上下の導体板のどちらかに磁束制
御板13を全面的に取付けることができる。このような
コイルCで異種金属薄板を挟む。ただし、異種の金属
が、同じ軟化状態になるように、磁束制御板13の導電
率や板厚を選び、融点の低い金属の側に磁束制御板13
を取付ける。この結果、融点の低い金属が溶け過ぎるこ
となく、異種金属薄板を容易に溶接できる。
Further, the magnetic flux control plate 13 can be entirely attached to one of the upper and lower conductor plates. A dissimilar metal thin plate is sandwiched between such coils C. However, the conductivity and thickness of the magnetic flux control plate 13 are selected so that different kinds of metals are in the same softened state.
Install. As a result, the dissimilar metal thin plate can be easily welded without excessively melting the low melting point metal.

【0032】磁束遮断板13を図7で示した複数のコイ
ルCと別の高さで複数並べて水平面内で自由に移動でき
るようにすることもできる。複数のコイルCと複数の磁
束遮断板13を自在に移動しながら、各コイルCに大電
流を複数回流し、溶接を繰り返せば、複雑な形状の溶接
が可能となる。
A plurality of magnetic flux shielding plates 13 may be arranged at a different height from the plurality of coils C shown in FIG. 7 so as to be freely movable in a horizontal plane. When a large current is applied to each coil C a plurality of times while freely moving the plurality of coils C and the plurality of magnetic flux blocking plates 13 and welding is repeated, welding of a complicated shape becomes possible.

【0033】第4の実施の形態 図9は、平板状コイルの上板と下板を一枚の平板の形態
に変えたもので、細幅の長い導体部と広幅の導体部を有
する平板状の一枚板の一巻コイルDの一例であり、
(a)は平面図、(b)は側面図である。電流集中部7
の長さを長くし、この電流集中部7を挟んで平行に広幅
の導体部8を設け、電流集中部7は右端で広幅の導体部
8と一体に形成されている。このコイルDの上に金属薄
板4を重ねて置き、上下方向から全体を締付金具等を用
いて固定して溶接する。また、コイルDの上にプラスチ
ックスシートを置き、その上に金属薄板を置いて、加圧
固定して、コイルに大電流を急激に流すと、うず電流は
プラスチックスシートには流れないが、金属薄板のプラ
スチックスシート側表面に流れる。この結果、両者の接
合面は温度が上がり、軟化溶融点に達し電磁力による圧
力を適切にすることにより両者は溶接される。
Fourth Embodiment FIG. 9 is a plan view in which the upper plate and the lower plate of the flat coil are changed to a single flat plate, and the flat plate has a long narrow conductor portion and a wide conductor portion. It is an example of a single-turn coil D of a single plate,
(A) is a plan view and (b) is a side view. Current concentrator 7
Is extended, and a wide conductor 8 is provided in parallel with the current concentrating portion 7 interposed therebetween. The current concentrating portion 7 is formed integrally with the wide conductor 8 on the right end. A thin metal plate 4 is placed on the coil D, and the whole is fixed and welded from above and below using a fastener. Also, if a plastic sheet is placed on the coil D, a thin metal plate is placed on the sheet, and the sheet is pressed and fixed, and a large current is suddenly passed through the coil, no eddy current flows through the plastic sheet. It flows to the plastic sheet side surface of the metal sheet. As a result, the temperature of the joint surface of the two increases, reaches the softening melting point, and the two are welded by appropriately adjusting the pressure by the electromagnetic force.

【0034】[0034]

【実施例】以下に、実施例を示す。 実施例1 第1実施の形態の図2に示す形態でコイルAへ実際に電
流を流して溶接した場合を以下に示す。電源1として低
インダクタンスの電源容量C=50〜200μF、充電
エネルギーは0.5〜3kJのコンデンサ電源を使用
し、スイッチ2を閉じ、コイルAの電流が集中する部分
7の幅が5mmの一巻の平板状コイルAに放電電流を流
した。鋼鉄製コイルの大きさは200×145×5mm
である。上板と下板は絶縁シートを挟んで密着させる。
両板は、厚さ2mm、図2に示す細幅の長い部分の幅は
5mm、長さは30〜70mmである。溶接用Al(A
1050)薄片は全長50mm、幅20〜50mm、板
厚0.3mmである。Al薄片の先端を磨き、約10〜
20mmを重ね、溶接した。幅約5mm、長さ20〜5
0mmの接合部が形成された。接合強度は充電エネルギ
ーに比例して一定程度までは大きくなり、1kJで3M
Pa、1.5kJで6MPaであった。充電エネルギー
が過剰になると、過度の溶融を生じて良好な接合はでき
ない。
Embodiments are described below. Example 1 A case where welding was performed by actually supplying a current to the coil A in the form shown in FIG. 2 of the first embodiment will be described below. The power supply 1 uses a low-inductance power supply capacity C = 50 to 200 μF, a charging power of 0.5 to 3 kJ for a capacitor power supply, closes the switch 2, and turns the portion 7 where the current of the coil A concentrates in one turn of 5 mm. A discharge current was passed through the flat coil A. The size of the steel coil is 200 × 145 × 5mm
It is. The upper plate and the lower plate are brought into close contact with an insulating sheet interposed therebetween.
Both plates have a thickness of 2 mm, a narrow long portion shown in FIG. 2 having a width of 5 mm, and a length of 30 to 70 mm. Welding Al (A
1050) The flake has a total length of 50 mm, a width of 20 to 50 mm, and a thickness of 0.3 mm. Polish the tip of the Al flake, about 10 ~
20 mm was overlapped and welded. About 5mm in width and 20-5 in length
A 0 mm joint was formed. The bonding strength increases up to a certain level in proportion to the charging energy and increases to 3M at 1 kJ.
It was 6 MPa at Pa and 1.5 kJ. If the charging energy is excessive, excessive melting occurs and good bonding cannot be achieved.

【0035】実施例2 第2実施の形態の図4に示す形態でコイルAへ実際に電
流を流して溶接した場合を以下に示す。電源1として実
施例1と同様の低インダクタンスのコンデンサ電源を使
用し、スイッチ2を閉じ、コイルAの電流が集中する部
分7の幅が10mmの平板状の一巻コイルAに放電電流
を流した。コイルAに流れた電流の最大値は、電源の充
電エネルギーが0.5kJのとき約118kAであり、
上板5の中央部分7の表面で発生する磁束密度は、約5
Tであった。また、電磁力に相当する磁気圧力は、金属
薄板4が銅板の場合、約9MPaと概算された。
Example 2 A case where welding is performed by actually applying a current to the coil A in the form shown in FIG. 4 of the second embodiment will be described below. A low-inductance capacitor power supply similar to that of the first embodiment was used as the power supply 1, the switch 2 was closed, and a discharge current was applied to the flat coil 1A having a width of 10 mm where the current of the coil A was concentrated. . The maximum value of the current flowing through the coil A is about 118 kA when the charging energy of the power supply is 0.5 kJ,
The magnetic flux density generated on the surface of the central portion 7 of the upper plate 5 is about 5
It was T. Further, the magnetic pressure corresponding to the electromagnetic force was estimated to be about 9 MPa when the metal thin plate 4 was a copper plate.

【0036】[0036]

【発明の効果】本発明は、従来例のように電極を使用せ
ずに金属薄板を電磁溶接する方法を提供できるものであ
り、従来、アルミニウム等の薄板をスポット溶接すると
き問題となっている被溶接金属の電極への溶着をほぼ完
全に防ぐことができる。したがって、これまで電極を使
用しているために比較的に困難であったアルミニウム薄
板等の溶接も容易になり、短時間に多量の溶接を行うこ
とができる。さらに、従来の方法では溶接不可能な材料
や、溶け過ぎてしまうため、溶接が困難であった薄板
も、本発明の方法では、磁束やうず電流の状態を制御す
れば、瞬間的に溶接できる。
The present invention can provide a method of electromagnetically welding a thin metal plate without using an electrode as in the conventional example, and has conventionally been a problem when spot welding a thin plate of aluminum or the like. Welding of the metal to be welded to the electrode can be almost completely prevented. Therefore, welding of a thin aluminum plate or the like, which has been relatively difficult due to the use of the electrodes, is also facilitated, and a large amount of welding can be performed in a short time. In addition, materials that cannot be welded by the conventional method, and thin plates that are difficult to weld because they melt too much, can be welded instantaneously by controlling the state of magnetic flux and eddy current in the method of the present invention. .

【図面の簡単な説明】[Brief description of the drawings]

【図1】本発明の第1の実施形態の平板状コイルAの
(a)側面図、(b)上板または下板の平面図である。
FIG. 1A is a side view of a flat coil A according to a first embodiment of the present invention, and FIG. 1B is a plan view of an upper plate or a lower plate.

【図2】図1の電流集中部を長くした平板状コイルAの
(a)側面図、(b)下板の平面図である。
FIGS. 2A and 2B are a side view and a plan view of a lower plate of a flat coil A in which a current concentrating portion in FIG. 1 is elongated.

【図3】図1の電流集中部を円形状とした平板状コイル
Aの(a)上板の平面図、(b)側面図、(c)下板の
平面図である。
3A is a plan view of an upper plate, FIG. 3B is a side view, and FIG. 3C is a plan view of a lower plate.

【図4】本発明の第2の実施形態の平板状コイルAの
(a)側面図、(b)下板の平面図である。
FIG. 4A is a side view of a flat coil A according to a second embodiment of the present invention, and FIG. 4B is a plan view of a lower plate.

【図5】図4の電流集中部と穴を長くした平板状コイル
Aの(a)上板の平面図、(b)側面図、(c)下板の
平面図である。
5 (a) is a plan view of an upper plate, FIG. 5 (b) is a side view, and FIG.

【図6】本発明の第3の実施の形態の細幅の長い導体板
をコの字型に形成した一巻コイルCと薄板の(a)斜視
図、(b)平面図、(c)電流と垂直方向の断面図であ
る。
FIG. 6A is a perspective view, FIG. 6B is a plan view, and FIG. 6C is a plan view of a single-turn coil C and a thin plate in which a narrow and long conductor plate according to a third embodiment of the present invention is formed in a U-shape. It is sectional drawing of a direction perpendicular | vertical to an electric current.

【図7】図6の一巻コイルCを複数用いる場合の(a)
平面図、(b)側面図である。
FIG. 7A shows a case where a plurality of single-turn coils C in FIG. 6 are used;
It is a top view, (b) side view.

【図8】図6の一巻コイルCに磁束遮断板を設けた場合
の(a)平面図、(b)側面図である。
8 (a) is a plan view and FIG. 8 (b) is a side view in the case where a magnetic flux blocking plate is provided in the single-turn coil C of FIG.

【図9】本発明の第4の実施形態の細幅の長い導体部と
広幅の導体部を有する一枚板の一巻コイルDの(a)平
面図、(b)側面図である。
FIG. 9A is a plan view and FIG. 9B is a side view of a single-turn coil D having a long and narrow conductor portion and a wide conductor portion according to a fourth embodiment of the present invention.

【図10】従来のスポット溶接法の概念を示す側面図で
ある。
FIG. 10 is a side view showing the concept of a conventional spot welding method.

【符号の説明】 1 放電電源 2 スイッチ 4 薄板 5 平板状コイルの上板 6 平板状コイルの下板 7 電流集中部 8 広幅の導体部 9 穴 13 磁束遮断板 A 平板状一巻コイル C コの字型一巻コイル D 一枚板の一巻コイル[Description of Signs] 1 Discharge power supply 2 Switch 4 Thin plate 5 Upper plate of flat coil 6 Lower plate of flat coil 7 Current concentrating part 8 Wide conductor part 9 Hole 13 Magnetic flux blocking plate A Flat single-turn coil C -Shaped single-turn coil D Single-plate single-turn coil

フロントページの続き (51)Int.Cl.6 識別記号 FI H05B 6/10 381 H05B 6/10 381 6/36 6/36 D Continued on the front page (51) Int.Cl. 6 Identification code FI H05B 6/10 381 H05B 6/10 381 6/36 6/36 D

Claims (12)

【特許請求の範囲】[Claims] 【請求項1】 対向状態に配する上板と下板とを導通状
態に設け、この上板と下板の双方若しくは一方に電流が
集中して流れる集中部を設けた平板状コイルを使用し、
この平板状コイルの上板と下板との間に、重ね配設した
金属薄板を配設し、この平板状コイルに電流を流し、電
磁誘導の法則を利用して、前記重ね配設した金属薄板に
うず電流を生じさせてこの重ねた金属薄板を溶接するこ
とを特徴とする金属薄板の電磁溶接法。
An upper plate and a lower plate arranged in a facing state are provided in a conductive state, and a plate-shaped coil provided with a concentrated portion in which a current flows in a concentrated manner in one or both of the upper plate and the lower plate is used. ,
Between the upper plate and the lower plate of the flat coil, a superposed thin metal plate is disposed, an electric current is applied to the flat coil, and the metal is superposed using the law of electromagnetic induction. An electromagnetic welding method for a metal sheet, wherein an eddy current is generated in the sheet and the stacked metal sheet is welded.
【請求項2】 前記上板および下板の夫々の略中央部分
に板幅を狭くして上板および下板を流れる電流が集中し
て流れる前記集中部を構成し、この上板および下板に設
けた集中部を対向位置に設け、前記上板および下板との
間に配した前記重ね配設した金属薄板に前記集中部で発
生した磁束を交差させてこの金属薄板にうず電流を生じ
させるように構成したことを特徴とする請求項1記載の
金属薄板の電磁溶接法。
2. A concentrating portion in which a current flowing through the upper plate and the lower plate flows in a concentrated manner at a substantially central portion of each of the upper plate and the lower plate, and the upper plate and the lower plate are formed. The magnetic flux generated in the concentrated portion intersects with the superposed thin metal plate disposed between the upper plate and the lower plate to generate an eddy current in the thin metal plate. The electromagnetic welding method for a thin metal plate according to claim 1, wherein the electromagnetic welding is performed.
【請求項3】 前記平板状コイルの上板若しくは下板の
形状を変更して、前記上板および下板との間に重ね配設
した異種の金属薄板を溶接することを特徴とする請求項
1、2いずれか1項に記載の金属薄板の電磁溶接法。
3. The method according to claim 1, wherein a shape of an upper plate or a lower plate of the flat coil is changed, and different kinds of thin metal plates disposed between the upper plate and the lower plate are welded. 3. The electromagnetic welding method for a metal sheet according to any one of claims 1 and 2.
【請求項4】 対向状態に配する上板と下板とを導通状
態に設け、この上板と下板の一方に電流が集中して流れ
る集中部を設けた平板状コイルを使用し、このコイルの
前記集中部を設けた上板もしくは下板の外側に、重ね配
設した金属薄板を配設し、この平板状コイルに電流を流
し、電磁誘導の法則を利用して、前記重ね配設した金属
薄板にうず電流を生じさせてこの重ねた金属薄板を溶接
することを特徴とする金属薄板の電磁溶接法。
4. An upper plate and a lower plate arranged in opposition are provided in a conductive state, and a plate-shaped coil provided with a concentrated portion through which current flows in one of the upper plate and the lower plate is used. Outside the upper plate or the lower plate provided with the concentrated portion of the coil, a superposed thin metal plate is disposed, an electric current is applied to the plate-shaped coil, and the superposed thin plate is utilized by using the law of electromagnetic induction. An electromagnetic welding method for a metal sheet, wherein an eddy current is generated in the metal sheet thus formed and the stacked metal sheets are welded.
【請求項5】 前記平板状コイルの上板若しくは下板の
一方の略中央部分に板幅を狭くして上板若しくは下板を
流れる電流が集中して流れる前記集中部を構成し、この
集中部を設けた上板若しくは下板の外側に配した前記重
ね配設した金属薄板に前記集中部で発生した磁束を交差
させてこの金属薄板にうず電流を生じさせるように構成
したことを特徴とする請求項4記載の金属薄板の電磁溶
接法。
5. A concentrated portion in which a current flowing through the upper plate or the lower plate flows in a concentrated manner at a substantially central portion of one of the upper plate and the lower plate of the flat coil, and the concentrated portion is formed. The magnetic flux generated in the concentrated portion intersects with the superposed thin metal plate disposed outside the upper plate or the lower plate provided with the portion to generate an eddy current in the thin metal plate. The method for electromagnetically welding metal sheets according to claim 4.
【請求項6】 金属薄板の接合面に低融点で高導電率の
金属薄板を介在させることを特徴とする請求項1ないし
5記載の金属薄板の電磁溶接法。
6. The electromagnetic welding method for a metal sheet according to claim 1, wherein a metal sheet having a low melting point and a high electrical conductivity is interposed on the joining surface of the metal sheet.
【請求項7】 電流が集中して流れる集中部を設けた平
板状の一巻コイル、細幅の長い導体板をコの字型に形成
したコの字型の一巻コイル、または細幅の長い導体部と
広幅の導体部を有する平板状の一枚板の一巻コイルと、
該コイルに放電電流を流すように該コイルの両端部に設
けた電流インプット部とアウトプット部にスイッチを介
して放電電源を電気的に接続してなることを特徴とする
電磁溶接装置。
7. A flat-plate single-turn coil provided with a concentrated portion through which a current flows in a concentrated manner, a U-shaped single-turn coil formed by forming a long narrow conductive plate into a U-shape, or a narrow single-turn coil. A single coil of a flat plate having a long conductor and a wide conductor,
An electromagnetic welding apparatus characterized in that a discharge power supply is electrically connected via switches to current input portions and output portions provided at both ends of the coil so that a discharge current flows through the coil.
【請求項8】 平板状の一巻コイルの電流が集中して流
れる集中部が細幅の円形状導体板により形成されている
ことを特徴とする請求項7記載の電磁溶接装置。
8. The electromagnetic welding apparatus according to claim 7, wherein the converging portion in which the current of the flat-plate one-turn coil flows in a concentrated manner is formed of a narrow circular conductor plate.
【請求項9】 コの字型の一巻コイルが断面円形の導線
を横長に並べた平板状の集合導線により形成されている
ことを特徴とする請求項7記載の電磁溶接装置。
9. The electromagnetic welding device according to claim 7, wherein the U-shaped one-turn coil is formed by a flat plate-shaped collective wire in which conductive wires having a circular cross section are arranged horizontally long.
【請求項10】 コの字型の一巻コイルが複数個並列ま
たは交差して並べて配置されていることを特徴とする請
求項7記載の電磁溶接装置。
10. The electromagnetic welding apparatus according to claim 7, wherein a plurality of U-shaped single-turn coils are arranged in parallel or crossed.
【請求項11】 コイルの一部に磁束遮断板が設けられ
ていることを特徴とする請求項7記載の電磁溶接装置。
11. The electromagnetic welding apparatus according to claim 7, wherein a magnetic flux shielding plate is provided on a part of the coil.
【請求項12】 低融点で高導電率の金属薄板を少なく
とも2枚の薄板の間に介在させて溶接した溶接物を、請
求項7記載の装置の平板状の一巻コイルの上板と下板と
の間、または細幅の長い導体板をコの字型に形成したコ
の字型の一巻コイルの上板と下板との間、あるいは上下
に設けた一枚板の一巻コイルの上下間に配設し、コイル
に電流を徐々に流して急激に遮断し、電磁誘導の法則を
利用して、前記配設した溶接物にうず電流を生じさせて
接合部分をジュール熱により加熱溶融するとともに高密
度の磁束による電磁力が該部分を離す方向に働くように
することを特徴とする薄板からなる溶接物を剥がす方
法。
12. A welded product obtained by interposing a low-melting-point, high-conductivity metal thin plate between at least two thin plates and welding the upper plate and the lower plate of a flat-shaped single-turn coil of the apparatus according to claim 7. A single-turn coil provided between the upper and lower plates of a U-shaped single-turn coil formed by forming a long and narrow conductor plate in a U-shape, or above or below Between the upper and lower parts of the coil, gradually cut off the current by flowing the current through the coil, and use the law of electromagnetic induction to generate an eddy current in the placed welded article and heat the joint by Joule heat. A method for peeling off a welded product made of a thin plate, characterized in that an electromagnetic force due to a high-density magnetic flux acts in a direction separating the portion while melting.
JP29431698A 1997-10-20 1998-10-15 Electromagnetic welding method and apparatus for thin metal plate Expired - Fee Related JP3751153B2 (en)

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JP28723597 1997-10-20
JP9-287235 1997-10-20
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