JP3780637B2 - Judging quality discrimination method in superposition ultrasonic welding - Google Patents

Judging quality discrimination method in superposition ultrasonic welding Download PDF

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JP3780637B2
JP3780637B2 JP16775397A JP16775397A JP3780637B2 JP 3780637 B2 JP3780637 B2 JP 3780637B2 JP 16775397 A JP16775397 A JP 16775397A JP 16775397 A JP16775397 A JP 16775397A JP 3780637 B2 JP3780637 B2 JP 3780637B2
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welding
displacement
amount
quality
ultrasonic welding
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JPH1110362A (en
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明彦 荻野
禎 川越
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Denso Corp
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Denso Corp
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Description

【０００１】
【発明の属する技術分野】
本発明は、重ね合わせ超音波溶接における接合品質判別方法に関する。
【０００２】
【従来の技術】
重ね合わせ超音波溶接は、図４に例示するように、アンビル（作業台ともいう。）５とホーン（超音波工具ともいう。）４のスリップ防止用ローレット４ａとの間に複数のワーク６と７を重ね合わせてセットし、ホーン４を超音波振動させることによって複数のワーク６と７とを接合させる超音波溶接である。
【０００３】
このような重ね合わせ超音波溶接においては、ワーク６に対するホーン４のグリップ力が接合部１２の接合品質を大きく左右し、例えばホーン４からワーク６へ超音波振動が十分伝達されない場合、接合部１２が十分に清浄化昇温されず接合強度が低下し、接合品質が不良となる。
【０００４】
従来、接合品質を判別するにあたっては、通常、溶接時間によって振動伝達率の変化を推察するという方法が採用されていた。
【０００５】
【発明が解決しようとする課題】
しかしながら、溶接時間によって接合品質を判別する方法では、接合品質の良否を容易かつ正確に判別することが困難な場合が多かった。
【０００６】
そこで、本発明者らは、接合品質を容易かつ正確に判別する方法を鋭意検討したところ、次のような知見を得た。
【０００７】
重ね合わせ超音波溶接によると、図４に示すように、ワーク接合部１２を含む変位部１３が変位する。この変位部１３の変位量Ｌは、一方のワーク６に対するローレット４ａの食込量Ｌe1と、他方のワーク７に対するアンビル５の食込量Ｌe2と、実質的に接合強度に関与するワーク６と７の接合部１２の変形量ＬW との和であり、Ｌ＝Ｌe1＋Ｌe2＋ＬW で表される。
【０００８】
正常な溶接の場合、図５（Ａ）に示すように、溶接中、ホーン４の超音波振動にワーク６が十分に追従でき、ホーン４の振幅量とワーク６の振幅量とがほぼ一致する。このような場合、ローレット４ａの食込量Ｌe1は小さく、例えば変位量Ｌが約０．３ｍｍであるとき約０．０５ｍｍとなる。なお、図５（Ａ）において、ＶP は、ホーン４の振動の方向及び大きさを、ＶW は、ワーク６の振動の方向及び大きさを便宜的に表している（後述する図５（Ｂ）においても同様である。）。
【０００９】
これに対し、ホーン４のセレーションが摩耗したり加圧力が低下したような状態の下で行なわれる異常な溶接の場合、図５（Ｂ）に示すように、溶接中、ローレット４ａのグリップ力不足によりワーク６がホーン４の超音波振動に追従できず滑りが発生し、ホーン４の振幅量とワーク６の振幅量とに差が生じる。このような場合、ワーク６がローレット４ａによって長時間塑性変形され、ローレット４ａの食込量Ｌe1は増大し、例えば変位量Ｌが約０．３ｍｍであるとき約０．１５〜０．２ｍｍとなる。
【００１０】
そして、正常な溶接の場合の溶接過程と異常な溶接の場合の溶接過程を、時間ｔに対する変位量Ｌの変化として表したところ、それぞれ図６にａとｂで示すようなグラフを得ることができた。
【００１１】
図６に示したグラフａとｂとを比較することにより、溶接初期においては、異常な溶接の場合の変位量Ｌが正常な溶接の場合の変位量Ｌよりも大きいことが分かる。例えば、発電機用整流器フィンのアルミ板（ｔ＝２〜３ｍｍ）と銅板（ｔ＝０．５〜１ｍｍ）とを溶接した場合、溶接開始から０．４秒が経過した時点ｔ0 では、正常溶接時の変位量Ｌが約０．１５ｍｍであったのに対し、異常溶接時の変位量Ｌは約０．２５ｍｍもあり、異常溶接時の溶接初期における変位量Ｌが大きいことが判明した。
【００１２】
また、正常な溶接の場合の溶接過程と異常な溶接の場合の溶接過程を、図６のグラフに基づき、時間ｔに対する変位変化量Ｋ（＝ΔＬ／Δｔ）の変化として表したところ、それぞれ図７にａとｂで示すようなグラフを得ることができた。
【００１３】
図７に示したグラフａとｂとを比較することにより、溶接初期においては、異常な溶接の場合の変位変化量Ｋが正常な溶接の場合の変位変化量Ｋよりも大きいことが分かる。例えば、溶接開始から０．２秒が経過した時点ｔ0 では、正常溶接時の変位変化量Ｋが約０．２ｍｍ／秒であったのに対し、異常溶接時の変位変化量Ｋは約０．４ｍｍ／秒もあり、異常溶接時の溶接初期における変位変化量Ｋが大きいことが判明した。
【００１４】
本発明は、上述したように正常溶接時と異常溶接時とでは溶接初期における変位量及び変位変化量に大きな差異が生じることに基づき、接合品質の判別を容易かつ正確に行なうことができる重ね合わせ超音波溶接における接合品質判別方法を提供することを目的とする。
【００１５】
【課題を解決するための手段】
本発明の重ね合わせ超音波溶接における接合品質判別方法によると、請求項１に記載のように、溶接初期の所定時点で求めた変位部の変位変化量に基づき、この変位変化量が大きいときには異常溶接と判断し、一方、変位変化量が小さいときには正常溶接と判断することにより、接合品質の判別を容易かつ正確に行うことが可能になる。
【００１７】
ここで、変位変化量を求める時点としては、一つの時点に限定されるものではなく、請求項２に記載のように複数の時点を設定するようにしてもよい。
【００１８】
【発明の実施の形態】
以下、本発明の一実施例を図面に基づいて説明する。
【００１９】
図１は、本実施例による重ね合わせ超音波溶接における接合品質判別方法を実施するための超音波溶接装置の構成を示す。
【００２０】
図１に示す超音波溶接装置は、安定化電源１と発振器２と振動子３とホーン（超音波工具）４とホーン保持部８と変位量センサ９と良否判別装置１０と表示装置１１とを備える。
【００２１】
安定化電源１には、交流電源（例えば、ＡＣ２００Ｖ）が接続される。安定化電源１は、発振器２に定電圧を印加する。
【００２２】
発振器２は、振動子３を駆動する。
【００２３】
振動子３は、超音波を出力する。
【００２４】
ホーン４は、振動子３の超音波出力を増幅する。
【００２５】
変位量センサ９は、ワーク６と７の接合部１２を含む変位部１３の変位量Ｌを検出するために、ホーン保持部８の下降量（変位量）を検出する。
【００２６】
良否判別装置１０は、変位量センサ９からの検出信号を入力し、接合品質の良否を判別する。また、良否判別装置１０は、溶接終了時に安定化電源１を停止させる。
【００２７】
表示装置１１は、良否判別装置１０の判定結果を表示する。
【００２８】
次に、上記構成の超音波溶接装置を用いた重ね合わせ超音波溶接における接合品質判別方法の第１実施例を図２に基づいて説明する。
【００２９】
まず、アンビル５とホーン４のローレット４ａとの間にワーク６と７とをセットし、加圧手段（図示せず。）によってワーク６と７に一定の圧力Ｐを加える（ステップ１０１）。なお、加圧手段は、溶接中、常に圧力Ｐが一定となるよう加圧する。
【００３０】
次に、安定化電源１を入れ、ホーン４を超音波振動させてワーク６、７の溶接を開始する（ステップ１０２）。
【００３１】
次に、良否判別装置１０において、変位量センサ９からの検出信号を入力し、変位部１３の変位量Ｌの計測を開始する（ステップ１０３）。
【００３２】
また、良否判別装置１０において、溶接時間ｔの計測を開始する（ステップ１０４）。
【００３３】
良否判別装置１０においては、溶接時間ｔが溶接初期における所定時点ｔ0 （例えば、溶接開始から０．４秒が経過した時点）に達したか否かを判断し（ステップ１０５）、溶接時間ｔが所定時点ｔ0 に達したと判断すると、この時点ｔ0 での変位量Ｌが接合品質良否判別のための基準値Ｌ0 以上か否かを判断する（ステップ１０６）。
【００３４】
変位量Ｌが基準値Ｌ0 以上であると判断した場合、異常溶接のため接合品質が悪いと判断し、表示装置１１に当該接合品が不良品である旨の表示をさせるとともに、当該接合品を不良品として排出させる（ステップ１０７）。
【００３５】
一方、変位量Ｌが基準値Ｌ0 未満であると判断した場合、正常溶接であり接合品質が良いと判断し、変位量Ｌが溶接終了判断のための基準値Ｌ1 に達したか否かを判断し（ステップ１０８）、変位量Ｌが基準値Ｌ1 に達したと判断すると、安定化電源１を停止させるなどして溶接を終了する（ステップ１０９）。
【００３６】
以上説明したように、第１実施例の重ね合わせ超音波溶接における接合品質判別方法によると、溶接初期の所定時点ｔ0 で検出した変位部１３の変位量Ｌに基づき、この変位量Ｌが大きいときには異常溶接と判断し、一方、変位量Ｌが小さいときには正常溶接と判断するようにしたため、接合品質の判別を容易かつ正確に行なうことが可能になる。
【００３７】
次に、重ね合わせ超音波溶接における接合品質判別方法の第２実施例を図３に基づいて説明する。
【００３８】
まず、アンビル５とホーン４のローレット４ａとの間にワーク６と７とをセットし、加圧手段（図示せず。）によってワーク６と７に一定の圧力Ｐを加える（ステップ２０１）。なお、加圧手段は、溶接中、常に圧力Ｐが一定となるよう加圧する。
【００３９】
次に、安定化電源１を入れ、ホーン４を超音波振動させてワーク６、７の溶接を開始する（ステップ２０２）。
【００４０】
次に、良否判別装置１０において、変位量センサ９からの検出信号を入力し、変位部１３の変位量Ｌの計測を開始する（ステップ２０３）。
【００４１】
また、良否判別装置１０において、溶接時間ｔの計測を開始する（ステップ２０４）。
【００４２】
また、良否判別装置１０において、上記変位量Ｌと上記溶接時間ｔとに基づいて変位変化量Ｋ（＝ΔＬ／Δｔ）を算出開始する（ステップ２０５）。
【００４３】
良否判別装置１０においては、溶接時間ｔが溶接初期における所定時点ｔ0 （例えば、溶接開始から０．２秒が経過した時点）に達したか否かを判断し（ステップ２０６）、溶接時間ｔが所定時点ｔ0 に達したと判断すると、この時点ｔ0 での変位変化量Ｋが接合品質良否判別のための基準値Ｋ0 よりも大きいか否かを判断する（ステップ２０７）。
【００４４】
変位変化量Ｋが基準値Ｋ0 よりも大きいと判断した場合、異常溶接のため接合品質が悪いと判断し、表示装置１１に当該接合品が不良品である旨の表示をさせるとともに、当該接合品を不良品として排出させる（ステップ２０８）。
【００４５】
一方、変位変化量Ｋが基準値Ｋ0 以下であると判断した場合、正常溶接であり接合品質が良いと判断し、変位量Ｌが溶接終了判断のための基準値Ｌ1 に達したか否かを判断し（ステップ２０９）、変位量Ｌが基準値Ｌ1 に達したと判断すると、安定化電源１を停止させるなどして溶接を終了する（ステップ２１０）。
【００４６】
以上説明したように、第２実施例の重ね合わせ超音波溶接における接合品質判別方法によると、溶接初期の所定時点ｔ0 で求めた変位部１３の変位変化量Ｋに基づき、この変位変化量Ｋが大きいときには異常溶接と判断し、一方、変位変化量が小さいときには正常溶接と判断するようにしたため、接合品質の判別を容易かつ正確に行なうことが可能になる。
【００４７】
なお、変位変化量Ｋを求める時点として、図７に示すように複数の時点ｔ0 、ｔ01、ｔ02を設定し、変位変化量の全体形状から接合品質の良否を判断するようにしてもよい。
【００４８】
また、本発明は、二枚のワークの接合のみに限定して適用されるものではなく、他に、例えば、アルミ板（ｔ＝２〜３ｍｍ）と銅板（ｔ＝０．５〜１ｍｍ）との間に鉄板（ｔ＝２〜３ｍｍ）を挿入し３枚同時に接合させる場合などにも適用でき、このような場合にも、接合品質の判別を容易かつ正確に行なうことが可能である。
【図面の簡単な説明】
【図１】一実施例による重ね合わせ超音波溶接における接合品質判別方法を実施するための超音波溶接装置の構成図である。
【図２】第１実施例による重ね合わせ超音波溶接における接合品質判別方法を示すフローチャートである。
【図３】第２実施例による重ね合わせ超音波溶接における接合品質判別方法を示すフローチャートである。
【図４】変位部の変位量を説明するための説明図である。
【図５】正常溶接と異常溶接との相違を説明するための説明図である。
【図６】正常溶接時の変位量と異常溶接時の変位量との相違を説明するためのグラフである。
【図７】正常溶接時の変位変化量と異常溶接時の変位変化量との相違を説明するためのグラフである。
【符号の説明】
６、７ ワーク
８ ホーン保持部
９ 変位量センサ
１０ 良否判別装置
１２ 接合部
１３ 変位部
Ｌ 変位量
Ｋ 変位変化量
ｔ0 所定時点[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for determining joint quality in superposition ultrasonic welding.
[0002]
[Prior art]
As illustrated in FIG. 4, the superposition ultrasonic welding is performed between a plurality of workpieces 6 between an anvil (also referred to as a work table) 5 and a knurl 4 a for preventing slip of a horn (also referred to as an ultrasonic tool) 4. 7 is an ultrasonic welding in which a plurality of workpieces 6 and 7 are joined by superposing and setting 7 and ultrasonically vibrating the horn 4.
[0003]
In such superposition ultrasonic welding, the gripping force of the horn 4 with respect to the workpiece 6 greatly affects the bonding quality of the bonding portion 12. For example, when ultrasonic vibration is not sufficiently transmitted from the horn 4 to the workpiece 6, the bonding portion 12. However, the temperature is not sufficiently cleaned and the bonding strength is lowered, resulting in poor bonding quality.
[0004]
Conventionally, in determining the joint quality, a method of inferring a change in vibration transmissibility according to the welding time is usually employed.
[0005]
[Problems to be solved by the invention]
However, in the method of determining the joint quality based on the welding time, it is often difficult to easily and accurately determine the quality of the joint quality.
[0006]
Therefore, the present inventors diligently studied a method for easily and accurately discriminating the joining quality, and obtained the following knowledge.
[0007]
According to the superposition ultrasonic welding, as shown in FIG. 4, the displacement portion 13 including the workpiece joining portion 12 is displaced. Displacement amount L of the displacement unit 13, the biting amount L e1 knurl 4a for one of the workpiece 6, the biting amount L e2 of the anvil 5 for the other workpiece 7, the workpiece 6 involved in substantially bonding strength 7 and the deformation amount L W of the joint 12, which is expressed as L = L e1 + L e2 + L W.
[0008]
In the case of normal welding, as shown in FIG. 5A, the workpiece 6 can sufficiently follow the ultrasonic vibration of the horn 4 during welding, and the amplitude amount of the horn 4 and the amplitude amount of the workpiece 6 substantially coincide. . In this case, the biting amount L e1 knurl 4a is small, approximately 0.05mm when for example the amount of displacement L of about 0.3 mm. In FIG. 5A, V P represents the direction and magnitude of vibration of the horn 4 and V W represents the direction and magnitude of vibration of the workpiece 6 for convenience (FIG. 5 (described later)). The same applies to B).
[0009]
On the other hand, in the case of abnormal welding performed under the condition that the serration of the horn 4 is worn or the pressure is reduced, the grip force of the knurl 4a is insufficient during welding as shown in FIG. As a result, the workpiece 6 cannot follow the ultrasonic vibration of the horn 4 and slips, and a difference occurs between the amplitude amount of the horn 4 and the amplitude amount of the workpiece 6. In this case, the workpiece 6 is long plastically deformed by knurling 4a, biting amount L e1 knurl 4a increases, for example, about 0.15~0.2mm when the displacement amount L is approximately 0.3mm Become.
[0010]
Then, when the welding process in the case of normal welding and the welding process in the case of abnormal welding are expressed as changes in the displacement L with respect to time t, graphs as indicated by a and b in FIG. 6 can be obtained, respectively. did it.
[0011]
By comparing the graphs a and b shown in FIG. 6, it can be seen that the displacement amount L in the case of abnormal welding is larger than the displacement amount L in the case of normal welding in the initial stage of welding. For example, when an aluminum plate (t = 2 to 3 mm) and a copper plate (t = 0.5 to 1 mm) of a rectifier fin for a generator are welded, it is normal at time t 0 when 0.4 seconds have elapsed from the start of welding. While the displacement L during welding was about 0.15 mm, the displacement L during abnormal welding was about 0.25 mm, and it was found that the displacement L at the initial stage of welding during abnormal welding was large.
[0012]
Further, the welding process in the case of normal welding and the welding process in the case of abnormal welding are expressed as changes in displacement change amount K (= ΔL / Δt) with respect to time t based on the graph of FIG. In Fig. 7, a graph as indicated by a and b was obtained.
[0013]
By comparing the graphs a and b shown in FIG. 7, it can be seen that the displacement change amount K in the case of abnormal welding is larger than the displacement change amount K in the case of normal welding in the initial stage of welding. For example, at time t 0 when 0.2 seconds have elapsed since the start of welding, the displacement change amount K during normal welding was about 0.2 mm / second, whereas the displacement change amount K during abnormal welding was about 0. The displacement change amount K at the initial stage of welding during abnormal welding was found to be large.
[0014]
As described above, the present invention is based on the fact that there is a large difference in the amount of displacement and the amount of displacement change at the initial stage of welding between normal welding and abnormal welding. An object of the present invention is to provide a method for discriminating joint quality in ultrasonic welding.
[0015]
[Means for Solving the Problems]
According to the joining quality determination method in superposition ultrasonic welding of the present invention, as described in claim 1, an abnormality occurs when the displacement change amount is large, based on the displacement change amount of the displacement portion obtained at a predetermined time in the initial stage of welding. It is possible to easily and accurately determine the joint quality by determining that the welding is performed and determining that the welding is normal when the displacement change amount is small.
[0017]
Here, the time point for obtaining the displacement change amount is not limited to one time point, and a plurality of time points may be set as described in claim 2 .
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
[0019]
FIG. 1 shows a configuration of an ultrasonic welding apparatus for carrying out a joint quality discrimination method in superposition ultrasonic welding according to the present embodiment.
[0020]
The ultrasonic welding apparatus shown in FIG. 1 includes a stabilized power source 1, an oscillator 2, a vibrator 3, a horn (ultrasonic tool) 4, a horn holding unit 8, a displacement sensor 9, a quality determination device 10, and a display device 11. Prepare.
[0021]
The stabilized power source 1 is connected to an AC power source (for example, AC 200V). The stabilized power supply 1 applies a constant voltage to the oscillator 2.
[0022]
The oscillator 2 drives the vibrator 3.
[0023]
The vibrator 3 outputs ultrasonic waves.
[0024]
The horn 4 amplifies the ultrasonic output of the vibrator 3.
[0025]
The displacement amount sensor 9 detects the descending amount (displacement amount) of the horn holding portion 8 in order to detect the displacement amount L of the displacement portion 13 including the joint portion 12 of the workpieces 6 and 7.
[0026]
The quality determination device 10 inputs a detection signal from the displacement sensor 9 and determines quality of the bonding quality. Moreover, the quality determination apparatus 10 stops the stabilized power supply 1 at the end of welding.
[0027]
The display device 11 displays the determination result of the quality determination device 10.
[0028]
Next, a description will be given of a first embodiment of a joining quality discrimination method in superposition ultrasonic welding using the ultrasonic welding apparatus having the above configuration with reference to FIG.
[0029]
First, the workpieces 6 and 7 are set between the anvil 5 and the knurl 4a of the horn 4, and a constant pressure P is applied to the workpieces 6 and 7 by a pressurizing means (not shown) (step 101). The pressurizing means pressurizes so that the pressure P is always constant during welding.
[0030]
Next, the stabilized power supply 1 is turned on, and the horn 4 is ultrasonically vibrated to start welding the workpieces 6 and 7 (step 102).
[0031]
Next, in the pass / fail judgment apparatus 10, a detection signal from the displacement amount sensor 9 is input, and measurement of the displacement amount L of the displacement portion 13 is started (step 103).
[0032]
Moreover, the quality determination apparatus 10 starts measuring the welding time t (step 104).
[0033]
In the quality determination device 10, it is determined whether or not the welding time t has reached a predetermined time t 0 in the initial stage of welding (for example, when 0.4 seconds have elapsed since the start of welding) (step 105). Is determined to have reached the predetermined time t 0 , it is determined whether or not the displacement L at this time t 0 is greater than or equal to a reference value L 0 for determining whether the joint quality is good or bad (step 106).
[0034]
When it is determined that the displacement L is greater than or equal to the reference value L 0, it is determined that the joint quality is poor because of abnormal welding, and the display device 11 displays that the joint product is defective, and the joint product. Are discharged as defective products (step 107).
[0035]
On the other hand, if it is determined that the displacement L is less than the reference value L 0, it is determined that the welding is normal and the joining quality is good, and whether or not the displacement L has reached the reference value L 1 for determining the end of welding. It determines (step 108), the displacement amount L is when it is determined to have reached the reference value L 1, and ends the welding and the like to stop the stabilized power source 1 (step 109).
[0036]
As described above, according to the joining quality determination method in the superposition ultrasonic welding of the first embodiment, the displacement amount L is large based on the displacement amount L of the displacement portion 13 detected at a predetermined time t 0 in the initial stage of welding. In some cases, it is determined that the welding is abnormal. On the other hand, when the displacement L is small, it is determined that the welding is normal. Therefore, it is possible to easily and accurately determine the joint quality.
[0037]
Next, a description will be given of a second embodiment of the joining quality discrimination method in superposition ultrasonic welding with reference to FIG.
[0038]
First, the workpieces 6 and 7 are set between the anvil 5 and the knurl 4a of the horn 4, and a constant pressure P is applied to the workpieces 6 and 7 by a pressurizing means (not shown) (step 201). The pressurizing means pressurizes so that the pressure P is always constant during welding.
[0039]
Next, the stabilized power source 1 is turned on, and the horn 4 is ultrasonically vibrated to start welding the workpieces 6 and 7 (step 202).
[0040]
Next, in the pass / fail discrimination apparatus 10, a detection signal from the displacement amount sensor 9 is input, and measurement of the displacement amount L of the displacement portion 13 is started (step 203).
[0041]
Further, the quality determination device 10 starts measuring the welding time t (step 204).
[0042]
Further, the quality determination device 10 starts calculating the displacement change amount K (= ΔL / Δt) based on the displacement amount L and the welding time t (step 205).
[0043]
In the quality determination device 10, it is determined whether or not the welding time t has reached a predetermined time point t 0 in the initial stage of welding (for example, when 0.2 seconds have elapsed since the start of welding) (step 206), and the welding time t. Is determined to have reached a predetermined time t 0 , it is determined whether or not the displacement change amount K at this time t 0 is larger than a reference value K 0 for determining whether or not the joint quality is good (step 207).
[0044]
When it is determined that the displacement change amount K is larger than the reference value K 0 , it is determined that the joint quality is poor because of abnormal welding, the display device 11 is displayed that the joint product is defective, and the joint The product is discharged as a defective product (step 208).
[0045]
On the other hand, if it is determined that the displacement change amount K is less than or equal to the reference value K 0, it is determined that the welding is normal and the joint quality is good, and whether or not the displacement amount L has reached the reference value L 1 for determining the end of welding. If it is determined that the displacement L has reached the reference value L 1 , the stabilization power source 1 is stopped and the welding is terminated (step 210).
[0046]
As described above, according to the joining quality determination method in the superposition ultrasonic welding of the second embodiment, this displacement change amount K is based on the displacement change amount K of the displacement portion 13 obtained at the predetermined time t 0 in the initial stage of welding. Since the welding is determined to be abnormal when the displacement is large, and the welding is determined to be normal when the displacement change amount is small, it is possible to easily and accurately determine the joint quality.
[0047]
As shown in FIG. 7, a plurality of time points t 0 , t 01 , and t 02 are set as the time points for obtaining the displacement change amount K, and the quality of the joint is judged from the overall shape of the displacement change amount. Good.
[0048]
In addition, the present invention is not limited to the joining of two workpieces. In addition, for example, an aluminum plate (t = 2 to 3 mm) and a copper plate (t = 0.5 to 1 mm) The present invention can also be applied to a case in which an iron plate (t = 2 to 3 mm) is inserted between the two plates and the three sheets are joined at the same time. In such a case, the joining quality can be easily and accurately determined.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of an ultrasonic welding apparatus for performing a joint quality discrimination method in superposition ultrasonic welding according to an embodiment.
FIG. 2 is a flowchart showing a joint quality discrimination method in superposition ultrasonic welding according to the first embodiment.
FIG. 3 is a flowchart showing a joint quality discrimination method in superposition ultrasonic welding according to the second embodiment.
FIG. 4 is an explanatory diagram for explaining a displacement amount of a displacement portion.
FIG. 5 is an explanatory diagram for explaining a difference between normal welding and abnormal welding.
FIG. 6 is a graph for explaining a difference between a displacement amount during normal welding and a displacement amount during abnormal welding.
FIG. 7 is a graph for explaining a difference between a displacement change amount during normal welding and a displacement change amount during abnormal welding.
[Explanation of symbols]
6, 7 Work piece 8 Horn holding portion 9 Displacement amount sensor 10 Pass / fail judgment device 12 Joint portion 13 Displacement portion L Displacement amount K Displacement change amount t 0 Predetermined time point

Claims (2)

ワーク間の接合部を含む変位部の変位量に基づき該変位部の変位変化量を求めると共に、溶接初期の所定時点で求めた前記変位部の変位変化量に基づいて接合品質の良否を判別する重ね合わせ超音波溶接における接合品質判別方法であって、
前記変位部の変位量は、ホーン保持部の変位量を検出する変位量センサの信号に基づいて検出されることを特徴とする重ね合わせ超音波溶接における接合品質判別方法。 Based on the displacement amount of the displacement portion including the joint portion between the workpieces, the displacement change amount of the displacement portion is obtained, and the quality of the joining is determined based on the displacement change amount of the displacement portion obtained at a predetermined point in the initial stage of welding. A method for determining joint quality in superposition ultrasonic welding,
A displacement quality determination method in superposition ultrasonic welding, wherein the displacement amount of the displacement portion is detected based on a signal of a displacement amount sensor that detects a displacement amount of a horn holding portion . 請求項１において、前記所定時点として複数の時点が設定されていることを特徴とする重ね合わせ超音波溶接における接合品質判別方法。 2. The method of determining joint quality in superposition ultrasonic welding according to claim 1, wherein a plurality of time points are set as the predetermined time points .
JP16775397A 1997-06-24 1997-06-24 Judging quality discrimination method in superposition ultrasonic welding Expired - Fee Related JP3780637B2 (en)

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Application Number Priority Date Filing Date Title
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JP4849246B2 (en) * 2006-12-22 2012-01-11 トヨタ自動車株式会社 Method for discriminating bonding quality of ultrasonic bonding
JP5038987B2 (en) * 2008-07-16 2012-10-03 カルソニックカンセイ株式会社 Ultrasonic metal bonding machine
JP6304882B2 (en) * 2014-06-30 2018-04-04 エリーパワー株式会社 Clip mounting method for electrode stack
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US20190131752A1 (en) * 2016-03-18 2019-05-02 Honda Motor Co., Ltd. Ultrasonic welding device and ultrasonic welding method
JP6594522B2 (en) * 2016-03-18 2019-10-23 本田技研工業株式会社 Ultrasonic welding apparatus and ultrasonic welding method
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