JPH0890250A - Method and equipment for resistance welding - Google Patents
Method and equipment for resistance weldingInfo
- Publication number
- JPH0890250A JPH0890250A JP6227111A JP22711194A JPH0890250A JP H0890250 A JPH0890250 A JP H0890250A JP 6227111 A JP6227111 A JP 6227111A JP 22711194 A JP22711194 A JP 22711194A JP H0890250 A JPH0890250 A JP H0890250A
- Authority
- JP
- Japan
- Prior art keywords
- welding
- current
- temperature
- learning
- surface temperature
- 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.)
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Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は、ステンレス鋼や高合金
鉄などを含む金属板や帯のストリップ同士を重ね合わせ
て溶接するための抵抗溶接方法および装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resistance welding method and apparatus for superposing and welding strips of metal plates or strips containing stainless steel, high alloy iron or the like.
【0002】[0002]
【従来の技術】従来から、たとえば特開平5ー1159
03号公報などで、金属の連続ストリップ処理ラインに
おいて、先行材と後行材との接合を抵抗溶接方法によっ
て行う構成が開示されている。この先行技術では、シー
ム溶接機による金属ストリップの重ね合わせ溶接を行い
ながら、ストリップ表面温度を検出し、単位時間におけ
る温度変化率を算出している。2. Description of the Related Art Conventionally, for example, Japanese Patent Laid-Open No. 5-1159.
Japanese Patent Publication No. 03, etc. discloses a configuration in which a preceding material and a following material are joined by a resistance welding method in a continuous metal strip processing line. In this prior art, while performing overlap welding of metal strips by a seam welder, the strip surface temperature is detected and the rate of temperature change per unit time is calculated.
【0003】図7は典型的なシーム溶接機の外観を示
し、図8は図7のシーム溶接機のキャリッジの内部構成
を示す。このようなシーム溶接機は、たとえば金属帯の
連続通板ラインの入側に設けられ、複数のペイオフリー
ルから金属帯コイルが巻戻されて順次供給される金属帯
を、先行材1の尾端と後行材2の先端とを順次的に、重
ね合わせて溶接するために用いられている。溶接時に
は、先行材1の尾端は出側クランプ3によって保持さ
れ、後行材2の先端は入側クランプ4によって保持され
る。先行材1および後行材2はキャリッジ5内に挿通さ
れ、キャリッジ5は先行材1および後行材2の板幅方向
に移動しながら重ね合わせ抵抗溶接を行う。キャリッジ
5に隣接して操作盤6が設けられており、シーム溶接機
を操作するための入力を行う。FIG. 7 shows the appearance of a typical seam welder, and FIG. 8 shows the internal structure of the carriage of the seam welder shown in FIG. Such a seam welding machine is provided, for example, on the entrance side of a continuous strip running line for metal strips, and the metal strips that are rewound from a plurality of payoff reels and sequentially supplied to the tail strip of the preceding material 1. And the leading end of the trailing member 2 are sequentially overlapped and used for welding. During welding, the tail end of the preceding material 1 is held by the exit side clamp 3 and the tip end of the following material 2 is held by the entrance side clamp 4. The preceding material 1 and the following material 2 are inserted into the carriage 5, and the carriage 5 performs lap resistance welding while moving the preceding material 1 and the following material 2 in the plate width direction. An operation panel 6 is provided adjacent to the carriage 5 and inputs for operating the seam welder.
【0004】キャリッジ5は、油圧シリンダなどの駆動
装置7によって、先行材1および後行材2の板幅方向に
移動可能である。キャリッジ5内には、ダブルカットシ
ャー8が設けられ、抵抗溶接を開始する前に先行材1の
尾端と、後行材2の先端とをカットする。出側クランプ
3および入側クランプ4を相互に近接するように変位さ
せたときに、先行材1の尾端と後行材2の先端との重ね
代が一定となるように、前もって切断しておくためであ
る。上下一対のローラ形の電極9は、先行材1および後
行材2を重ね合わせた上下から溶接電流を流し、発生す
るジュール熱によって先行材1および後行材2を部分的
に溶融させ、先行材1の尾端と後行材2の先端との接合
を行う。電極9には、二次導体10から大きな電流値の
溶接電流が供給される。ダブルカットシャー8、電極9
および二次導体10は、キャリッジフレーム11内に設
置されている。キャリッジフレーム11の外部には、二
次導体10に電流を供給するための溶接電源12が取付
けられており、キャリッジ5の移動とともに、移動可能
である。The carriage 5 can be moved in the plate width direction of the preceding material 1 and the following material 2 by a driving device 7 such as a hydraulic cylinder. A double cut shear 8 is provided in the carriage 5 and cuts the tail end of the preceding material 1 and the leading end of the following material 2 before starting resistance welding. When the output side clamp 3 and the input side clamp 4 are displaced so as to be close to each other, they are cut in advance so that the overlap margin between the tail end of the preceding material 1 and the tip of the following material 2 becomes constant. This is to keep it. The pair of upper and lower roller-shaped electrodes 9 apply a welding current from above and below where the preceding material 1 and the following material 2 are superposed, and the Joule heat generated partially melts the preceding material 1 and the following material 2, The tail end of the material 1 and the tip of the following material 2 are joined. A welding current having a large current value is supplied to the electrode 9 from the secondary conductor 10. Double cut shear 8, electrode 9
The secondary conductor 10 is installed in the carriage frame 11. A welding power source 12 for supplying a current to the secondary conductor 10 is attached to the outside of the carriage frame 11 and can be moved together with the movement of the carriage 5.
【0005】電極間に流そうとする溶接電流は、先行材
1および後行材2のそれぞれの板厚、板幅、材質や、相
互の重ね代、電極9の送り速度や加圧力等のデータに基
づいて予め外部から初期設定される。電極9を上下で加
圧しながら、電極9間に一定の溶接電流を流すために
は、溶接電流を検出してフィードバック制御を行ってい
る。溶接電流制御のためには、たとえばサイリスタなど
のスイッチング素子が用いられ、そのゲートを溶接電流
に見合う点弧角で点弧し、一定値に制御する。The welding current to be applied between the electrodes is the data such as the plate thickness, the plate width, the material of each of the leading material 1 and the trailing material 2, the mutual overlapping margin, the feeding speed of the electrode 9 and the pressing force. Is initialized from the outside beforehand. In order to apply a constant welding current between the electrodes 9 while pressing the electrodes 9 up and down, the welding current is detected and feedback control is performed. A switching element such as a thyristor is used for controlling the welding current, and its gate is ignited at an ignition angle corresponding to the welding current and controlled to a constant value.
【0006】溶接に必要な溶接電流は、ジュールの法則
に従って次の第1式で与えられる。The welding current required for welding is given by the following first equation according to Joule's law.
【0007】 Q = 0.24 × I2 × R × t …(1) この第1式で、Qは入熱量(kcal)、Iは溶接電流
(A)、Rは電極間の抵抗値(Ω)、tは溶接時間(s
ec)を表す。tは、単位面積当りIの溶接電流が流れ
る時間であり、電極9の送り速度によって決まる。Rは
金属の材質、重ね代および電極加圧力によって決定され
る。溶接性は、入熱量Qを溶接電流Iと、溶接時間t
と、抵抗値Rでコントロールすれば、常に一定の条件で
溶接が可能となるはずである。従来のシーム溶接機で
は、これらの条件を一定になるように制御している。Q = 0.24 × I 2 × R × t (1) In this first equation, Q is the heat input (kcal), I is the welding current (A), and R is the resistance value between the electrodes (Ω). ), T is the welding time (s
ec) is represented. t is the time for which the welding current of I per unit area flows, and is determined by the feed speed of the electrode 9. R is determined by the material of the metal, the stacking margin, and the electrode pressing force. The weldability is determined by the heat input Q, the welding current I, and the welding time t.
Then, if the resistance value R is controlled, welding should always be possible under constant conditions. In the conventional seam welder, these conditions are controlled to be constant.
【0008】[0008]
【発明が解決しようとする課題】図7に示すようなシー
ム溶接機では、機械的なガタなどによる重ね代の変化で
抵抗値Rが変化し、電極9の送り速度の変動で溶接時間
tが変化し、油圧系の変動によって電極加圧力が変化し
て抵抗値Rが変化し、さらに先行材1または後行材2の
接触部の形状や表面状態などで抵抗値Rが変化する。金
属の接触部の形状や表面状態の変化に対しては、圧延油
の付着の程度や、板厚の公差ずれ、酸化皮膜であるスケ
ールの有無、表面の凹凸など、様々な変動要因が考えら
れる。これらの要因の変動によって、溶接不良による通
板中の溶接部の板切れ、溶接部圧延時の溶接割れなどを
発生し、通板ラインや製品の品質に悪影響を与える。In the seam welding machine as shown in FIG. 7, the resistance value R changes due to the change in the overlap margin due to mechanical backlash, and the welding time t changes due to the change in the feed speed of the electrode 9. The resistance value R changes due to the change in the hydraulic system, the electrode pressing force changes, and the resistance value R also changes depending on the shape and surface condition of the contact portion of the preceding material 1 or the following material 2. Various factors such as the degree of adhesion of rolling oil, deviation of plate thickness tolerance, presence or absence of scale as an oxide film, and surface roughness can be considered for changes in the shape and surface condition of metal contact parts. . Fluctuations of these factors may cause the welded part to break during welding, or weld cracking during rolling of the welded part due to defective welding, which adversely affects the quality of the threading line and products.
【0009】特開平5−115903号公報の先行技術
では、溶接部の表面温度を検出して、溶接部の良否を判
断するようにしているけれども、溶接部の表面温度が一
定の範囲内になるように制御する点については開示され
ておらず、良好な溶接を行うことはできない。In the prior art of Japanese Patent Laid-Open No. 5-115903, the surface temperature of the welded portion is detected to judge the quality of the welded portion, but the surface temperature of the welded portion falls within a certain range. However, good welding cannot be performed.
【0010】本発明の目的は、溶接部の温度を一定の目
標範囲内に制御して安定な抵抗溶接を行うことができる
抵抗溶接方法および装置を提供することである。An object of the present invention is to provide a resistance welding method and apparatus capable of performing stable resistance welding by controlling the temperature of the welded portion within a fixed target range.
【0011】[0011]
【課題を解決するための手段】本発明は、金属ストリッ
プを重ねて抵抗溶接する方法において、溶接電流を検出
し、溶接時の表面温度を測定し、測定された表面温度が
目標範囲内になるように溶接電流を補正することを特徴
とする抵抗溶接方法である。また本発明の溶接電流の補
正は、溶接条件と表面温度の測定値との関係を学習して
おき、学習結果に従って行うことを特徴とする。また本
発明は、比率αを 0 ≦ α ≦ 1 の範囲で設定し、溶
接条件に対応する補正量に比率αを乗算し、前記学習結
果に基づく補正量に比率(1−α)を乗算し、これらの
乗算結果の和で溶接電流の補正を行うことを特徴とす
る。また本発明は、溶接中の溶接条件に異常があるか否
かを判断し、異常があると判断されるときは、前記学習
を行わないことを特徴とする。また本発明は、金属スト
リップの溶接結果に異常があるか否かを判断し、溶接結
果が異常と判断されるときの溶接条件と表面温度の測定
値との関係は、学習結果から除くことを特徴とする。さ
らに本発明は、金属ストリップを重ねて抵抗溶接する装
置において、溶接条件を検出する条件検出手段と、溶接
時の表面温度を測定する温度測定手段と、条件検出手段
および温度測定手段からの出力に応答し、溶接条件と表
面温度との関係を記憶する学習手段と、温度測定手段お
よび学習手段からの出力に応答し、表面温度が目標範囲
内になるように溶接電流を補正する電流補正手段とを含
むことを特徴とする抵抗溶接装置である。SUMMARY OF THE INVENTION The present invention is a method of resistance welding by laminating metal strips, in which the welding current is detected, the surface temperature during welding is measured, and the measured surface temperature is within a target range. The resistance welding method is characterized in that the welding current is corrected as described above. The correction of the welding current according to the present invention is characterized in that the relationship between the welding conditions and the measured value of the surface temperature is learned and the correction is performed according to the learning result. Further, according to the present invention, the ratio α is set within a range of 0 ≦ α ≦ 1, the correction amount corresponding to the welding condition is multiplied by the ratio α, and the correction amount based on the learning result is multiplied by the ratio (1−α). The welding current is corrected by the sum of these multiplication results. Further, the present invention is characterized in that it is judged whether or not there is an abnormality in the welding conditions during welding, and when it is judged that there is an abnormality, the learning is not performed. In addition, the present invention determines whether or not there is an abnormality in the welding result of the metal strip, and the relationship between the welding condition and the measured value of the surface temperature when the welding result is determined to be abnormal is excluded from the learning result. Characterize. Furthermore, the present invention is, in an apparatus for resistance welding by stacking metal strips, condition detecting means for detecting welding conditions, temperature measuring means for measuring a surface temperature during welding, and output from the condition detecting means and the temperature measuring means. A learning unit that responds and stores the relationship between the welding condition and the surface temperature; and a current correction unit that responds to the outputs from the temperature measuring unit and the learning unit and that corrects the welding current so that the surface temperature falls within the target range. It is a resistance welding device characterized by including.
【0012】[0012]
【作用】本発明に従えば、溶接電流を検出して、溶接機
の表面温度の測定値が目標範囲内になるように溶接電流
を補正する。溶接が良好に行われるか否かは、溶接電流
によるジュール熱によって溶接部の温度がどの程度まで
上昇するか否かによって決定される。温度が高すぎると
溶接部の破断や割れの原因となり、温度が低すぎると溶
接強度が不足しやすい。溶接電流による発熱量は、抵抗
や溶接時間によって変化するけれども、溶接電流はその
2乗の値として温度に大きな影響を与える。溶接部の温
度上昇に関して、溶接電流を制御すれば、他の要因によ
る変動を容易に打ち消して、迅速に温度の補正を行うこ
とができる。According to the present invention, the welding current is detected, and the welding current is corrected so that the measured surface temperature of the welding machine is within the target range. Whether or not the welding is performed well depends on how much the temperature of the welded portion rises due to the Joule heat generated by the welding current. If the temperature is too high, it may cause breakage or cracks in the welded portion, and if the temperature is too low, the welding strength tends to be insufficient. Although the amount of heat generated by the welding current changes depending on the resistance and the welding time, the welding current greatly affects the temperature as its squared value. If the welding current is controlled with respect to the temperature rise of the welded portion, fluctuations due to other factors can be easily canceled and the temperature can be corrected quickly.
【0013】また本発明に従えば、溶接条件と、表面温
度の測定値との関係を予め学習しておき、学習結果に従
って溶接電流の補正を行う。溶接条件には種々の要因が
含まれ、表面温度に対しては種々の形で影響する。予め
学習しておくことによって、溶接条件の個々の要因の変
動に対する溶接電流の補正の仕方を、より精度の高いも
のに改善していくことができる。According to the present invention, the relationship between the welding condition and the measured surface temperature is learned in advance, and the welding current is corrected according to the learning result. Welding conditions include various factors and affect the surface temperature in various ways. By learning in advance, it is possible to improve the method of correcting the welding current with respect to the variation of each factor of the welding condition to a more accurate method.
【0014】また本発明に従えば、比率αを設定して、
溶接条件と学習との関係を調整し、表面温度に対する溶
接電流の補正をより高精度で行うことができる。According to the invention, the ratio α is set to
By adjusting the relationship between the welding conditions and learning, it is possible to correct the welding current with respect to the surface temperature with higher accuracy.
【0015】また本発明に従えば、溶接中の溶接条件に
異常があると判断されるときには、その条件は学習の対
象としないので、溶接条件が良好なときにのみの学習結
果を用いて精度の高い溶接電流の補正を行うことができ
る。Further, according to the present invention, when it is judged that the welding condition during welding is abnormal, the condition is not subject to learning, so that the accuracy is obtained by using the learning result only when the welding condition is good. It is possible to correct high welding current.
【0016】また本発明に従えば、溶接結果が異常と判
断されるときには、そのときの溶接条件と、表面温度と
の関係は学習の対象から除くので、溶接結果が良好な関
係のみを学習結果として残し、安定な溶接結果が得られ
る補正を行うことができる。Further, according to the present invention, when the welding result is judged to be abnormal, the relationship between the welding condition and the surface temperature at that time is excluded from the object of learning, so only the relationship with a good welding result is learned. As a result, it is possible to perform correction so as to obtain a stable welding result.
【0017】さらに本発明に従えば、条件検出手段によ
って検出された溶接条件と、温度測定手段によって検出
された表面温度との関係を学習手段が記憶し、学習結果
に基づいて溶接電流の補正が行われる。一定の溶接条件
の下で、溶接電流の変化による表面温度の変化が学習さ
れるので、溶接中の溶接電流を補正して最適な溶接温度
に調整することができる。Further, according to the present invention, the learning means stores the relationship between the welding condition detected by the condition detecting means and the surface temperature detected by the temperature measuring means, and the welding current is corrected based on the learning result. Done. Under constant welding conditions, the change in surface temperature due to the change in welding current is learned, so that the welding current during welding can be corrected and adjusted to the optimum welding temperature.
【0018】また本発明に従えば、溶接電流の補正は、
溶接条件に対応する補正量を比率αを乗算し、学習結果
に基づく補正量に比率(1−α)を乗算して、これらの
乗算結果の和で行うので、溶接条件と学習結果とを適度
に反映させて溶接電流の補正を行い、溶接温度を容易に
最適値に制御することができる。According to the invention, the correction of the welding current is
The correction amount corresponding to the welding condition is multiplied by the ratio α, the correction amount based on the learning result is multiplied by the ratio (1−α), and the sum of these multiplication results is used. Therefore, the welding condition and the learning result are appropriately adjusted. It is possible to easily control the welding temperature to the optimum value by correcting the welding current by reflecting the above.
【0019】また本発明に従えば、溶接中の溶接条件に
異常があると判断されるときには、溶接条件と、表面温
度の測定値との間の関係の学習は行わない。学習結果に
は、溶接条件に異常がない場合の表面電流の測定値との
関係が得られるので、精度よく溶接電流の補正を行うこ
とができる。Further, according to the present invention, when it is determined that the welding condition during welding is abnormal, the relationship between the welding condition and the measured surface temperature is not learned. Since the learning result has a relationship with the measured value of the surface current when there is no abnormality in the welding conditions, the welding current can be accurately corrected.
【0020】また本発明に従えば、溶接結果が異常と判
断されるときの溶接条件と、表面温度の測定値との関係
は学習結果から除かれるので、溶接電流の補正は、良好
な溶接結果が得られている実績のある条件のみを使用す
る。これによって、補正した溶接電流による溶接結果が
良好である可能性を高めることができる。Further, according to the present invention, the relationship between the welding condition when the welding result is judged to be abnormal and the measured value of the surface temperature is excluded from the learning result. Use only proven conditions for which As a result, it is possible to increase the possibility that the welding result by the corrected welding current is good.
【0021】さらに本発明に従えば、条件検出手段によ
って検出される溶接条件と、温度測定手段によって測定
される溶接時の表面温度との関係を学習手段が記憶し、
電流補正手段は表面温度が目標範囲内になるように学習
結果に従って溶接電流を補正する。学習手段によって、
溶接条件と、表面温度との測定値との関係についての実
績を利用することができ、溶接電流の補正による溶接温
度の制御を高精度で行うことができる。Further, according to the invention, the learning means stores the relationship between the welding condition detected by the condition detecting means and the surface temperature at the time of welding measured by the temperature measuring means,
The current correction means corrects the welding current according to the learning result so that the surface temperature falls within the target range. By means of learning
The actual results of the relationship between the welding condition and the measured value of the surface temperature can be used, and the welding temperature can be controlled with high accuracy by correcting the welding current.
【0022】[0022]
【実施例】図1は本発明の一実施例の概略的な電気的構
成を示し、図2は図1の処理装置に関連する電気的構成
を示し、図3は図1の実施例の動作を示し、図4はシー
ム溶接のための機械的構成を示し、図5は本発明の他の
実施例の電気的構成を示し、図6は本発明のさらに他の
実施例の電気的構成を示す。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a schematic electrical construction of an embodiment of the present invention, FIG. 2 shows an electrical construction related to the processing apparatus of FIG. 1, and FIG. 3 shows an operation of the embodiment of FIG. FIG. 4 shows a mechanical configuration for seam welding, FIG. 5 shows an electrical configuration of another embodiment of the present invention, and FIG. 6 shows an electrical configuration of yet another embodiment of the present invention. Show.
【0023】図1に示すように、二次導体20から供給
される溶接電流が、先行材21および後行材22に流
れ、その際のジュール熱によってシーム溶接が行われ
る。二次導体20へは、溶接トランス23によって商用
交流電源から降圧されて大電流化された溶接電流が供給
され、電極24に導かれる。電極24は、先行材21お
よび後行材22を上下から押圧する上電極24aと、下
電極24bとから構成される。上電極24aと下電極2
4bとによって挟持される部分の表面温度は、放射温度
計25によって計測される。放射温度計25の出力は、
変換器26によって4〜20mAの範囲の電流値に変換
される。溶接トランス23の一次側には、商用交流電源
からサイリスタスタック27を介して電力が供給され
る。一次側の電流は、電流検出器28によって検出され
る。一次側の電流は、溶接トランス23の降圧比に反比
例して増大され、二次側で溶接電流となる。As shown in FIG. 1, a welding current supplied from the secondary conductor 20 flows through the preceding material 21 and the following material 22, and the Joule heat at that time causes seam welding. To the secondary conductor 20, a welding transformer 23 supplies a welding current, which has been stepped down from the commercial AC power source and has a large current, and is guided to the electrode 24. The electrode 24 is composed of an upper electrode 24a that presses the leading material 21 and the trailing material 22 from above and below, and a lower electrode 24b. Upper electrode 24a and lower electrode 2
The surface temperature of the portion sandwiched by 4b is measured by the radiation thermometer 25. The output of the radiation thermometer 25 is
It is converted into a current value in the range of 4 to 20 mA by the converter 26. Electric power is supplied to the primary side of the welding transformer 23 from a commercial AC power source through the thyristor stack 27. The current on the primary side is detected by the current detector 28. The current on the primary side is increased in inverse proportion to the step-down ratio of the welding transformer 23, and becomes the welding current on the secondary side.
【0024】溶接電流は、上位のプロセスコンピュータ
などによる外部の溶接電流設定装置29によって設定さ
れる溶接電流設定値に、マイクロコンピュータなどによ
って実現される処理装置30から与えられる溶接電流補
正量を加え、さらにフィードバック制御が行われて決定
される。処理装置30には、先行材データ設定装置3
1、後行材データ設定装置32および設備異常検知装置
33からの信号が与えられ、予め定められるプログラム
に従って溶接電流補正量を算出する演算を行う。溶接電
流設定装置29からの溶接電流の設定値と、処理装置3
0からの溶接電流の補正量とは、補正装置34で加え合
わされ、その出力はフィードバック装置35に与えられ
る。フィードバック装置35の出力は、出力増幅器36
を介してサイリスタスタック27へゲート信号として与
えられる。サイリスタスタック27は、スイッチング素
子として複数のサイリスタを含み、ゲート信号に従って
溶接トランス23の一次電流を位相制御し、二次導体2
0に流れる溶接電流を調整する。溶接トランス23の一
次側には、溶接電流に対応する一次電流が流れ、その電
流は電流検出器28から入力増幅器37を介してフィー
ドバック装置35に戻される。The welding current is obtained by adding a welding current correction amount given by a processing device 30 realized by a microcomputer to a welding current set value set by an external welding current setting device 29 by a host process computer or the like, Further, feedback control is performed and it is determined. The processing device 30 includes the preceding material data setting device 3
1, signals from the trailing material data setting device 32 and the equipment abnormality detecting device 33 are given, and calculation for calculating the welding current correction amount is performed according to a predetermined program. The set value of the welding current from the welding current setting device 29 and the processing device 3
The correction amount of the welding current from 0 is added by the correction device 34, and the output is given to the feedback device 35. The output of the feedback device 35 is the output amplifier 36.
Is given as a gate signal to the thyristor stack 27 via. The thyristor stack 27 includes a plurality of thyristors as switching elements, controls the phase of the primary current of the welding transformer 23 according to a gate signal, and controls the secondary conductor 2
Adjust the welding current flowing to zero. A primary current corresponding to the welding current flows through the primary side of the welding transformer 23, and the current is returned from the current detector 28 to the feedback device 35 via the input amplifier 37.
【0025】処理装置30は、先行材データ設定装置3
1および後行材データ設定装置32に設定される先行材
および後行材の鋼種などの材質、板厚および板幅などの
条件に従って予め設定されている目標溶接温度をデータ
として有している。このデータを変換器26からの出力
によって与えられる検出温度と比較し、その上限または
下限のチェック値より大きな偏差が発生した場合は、偏
差大信号を出力して、偏差大警報器38から警報を発生
させる。さらに、先行材21と後行材22とを溶接した
結果が異常であれば、爾後的に、溶接異常入力装置39
から処理装置30にその旨を入力する。The processing device 30 is the preceding material data setting device 3
1 and the following material data setting device 32 has the target welding temperature preset according to the material such as the steel type of the preceding material and the following material, the plate thickness and the plate width. This data is compared with the detected temperature given by the output from the converter 26, and when a deviation larger than the check value of the upper limit or the lower limit is generated, a large deviation signal is output and a large deviation alarm 38 issues an alarm. generate. Further, if the result of welding the preceding material 21 and the following material 22 is abnormal, the welding abnormality input device 39 is subsequently detected.
Is input to the processing device 30.
【0026】図2には、図1の処理装置30に関連する
構成をより詳細に示す。先行材データ設定装置31およ
び後行材データ設定装置32は、材質31a,32a、
板厚31b,32b、板幅31c,32cなどのデータ
を処理装置30にそれぞれ与える。処理装置30内に
は、ROMやRAMなどのメモリと、CPUなどとに基
づきソフトウエア処理によって実現される学習制御手段
40、学習メモリ41、データメモリ42、平均温度演
算手段43、演算手段44,45、不感帯設定手段4
6、上下限チェック手段47およびリミッタ手段48な
どが含まれる。設備異常検知装置33は、次の表1に示
すような項目について、溶接機の動作状態を常時監視
し、溶接異常と判定されるときには、その判定結果を学
習制御手段40に入力する。また、金属帯の溶接部分が
後工程において異常であると判断されるときには、溶接
異常入力装置39を介して、学習制御手段40に関連す
るデータが入力される。FIG. 2 shows the configuration related to the processing device 30 of FIG. 1 in more detail. The preceding material data setting device 31 and the following material data setting device 32 are made of materials 31a, 32a,
Data such as plate thicknesses 31b and 32b and plate widths 31c and 32c are provided to the processing device 30, respectively. In the processing device 30, a learning control means 40, a learning memory 41, a data memory 42, an average temperature calculation means 43, a calculation means 44, which are realized by software processing based on a memory such as a ROM or a RAM and a CPU, etc. 45, dead zone setting means 4
6, an upper / lower limit checking means 47, a limiter means 48 and the like are included. The equipment abnormality detection device 33 constantly monitors the operation state of the welding machine for the items shown in Table 1 below, and when it is determined that there is a welding abnormality, inputs the determination result to the learning control means 40. When it is determined that the welded part of the metal strip is abnormal in the subsequent process, the data related to the learning control means 40 is input via the welding abnormality input device 39.
【0027】[0027]
【表1】 [Table 1]
【0028】図3は、図1および図2の実施例の動作を
示す。ステップa1から、1組の先行材と後行材との間
について溶接の準備が開始される。ステップa2では、
板厚、板幅、鋼種、送り速度、重ね代、電極加圧力等の
溶接条件が入力される。ステップa3では、ステップa
2で入力された溶接条件に従って、技術標準などによっ
て予め設定されている電流値を、溶接電流として設定す
る。ステップa4では、図2の先行材データ設定装置3
1から、先行材についての材質31a、板厚31bおよ
び板幅31cなどのデータが処理装置30に与えられ
る。ステップa5では、図1の後行材データ設定装置3
2から、後行材についての材質32a、板厚32b、お
よび板幅32cなどのデータが、処理装置30に与えら
れる。ステップa6では、与えられたデータに従ってデ
ータメモリ42から目標温度と上限および下限の範囲と
が読出される。ステップa7では、図2の学習メモリ4
1から、データメモリ42からの目標温度と、平均温度
演算手段43からの平均温度とに基づき、目標温度を修
正すべき温度修正量が読出される。図1の演算手段44
では、データメモリ42からの目標温度を、学習メモリ
41からの温度修正量で修正し、修正結果を演算手段4
5に与える。演算手段45では、溶接温度26aと、演
算手段44からの出力とに応答し、図3のステップa8
の温度比較を行う。FIG. 3 shows the operation of the embodiment of FIGS. 1 and 2. From step a1, preparation for welding is started between a pair of the leading material and the trailing material. In step a2,
Welding conditions such as plate thickness, plate width, steel type, feed rate, overlap margin, electrode pressure, etc. are entered. In step a3, step a
According to the welding condition input in 2, the current value preset by the technical standard or the like is set as the welding current. At step a4, the preceding material data setting device 3 of FIG.
From 1, the data such as the material 31a, the plate thickness 31b, and the plate width 31c of the preceding material is given to the processing device 30. In step a5, the trailing material data setting device 3 of FIG.
From 2, the data such as the material 32a, the plate thickness 32b, and the plate width 32c of the succeeding material are given to the processing device 30. At step a6, the target temperature and the upper and lower limit ranges are read from the data memory 42 according to the supplied data. At step a7, the learning memory 4 of FIG.
From 1, the temperature correction amount for correcting the target temperature is read based on the target temperature from the data memory 42 and the average temperature from the average temperature calculation means 43. Computing means 44 of FIG.
Then, the target temperature from the data memory 42 is corrected by the temperature correction amount from the learning memory 41, and the correction result is calculated by the calculating means 4
Give 5 The calculating means 45 responds to the welding temperature 26a and the output from the calculating means 44, and executes step a8 in FIG.
Temperature comparison.
【0029】ステップa9では、演算手段45における
温度比較の結果が図2の不感帯設定手段46に与えら
れ、温度の偏差が予め定められる不感帯の範囲を超える
と、偏差に対応した出力が上下限チェック手段47に与
えられる。上下限チェック手段47は、図3のステップ
a10の上下限チェック処理を行い、偏差が上下限を超
えるときには、ステップa11からステップa12に移
り、偏差大警報器38から警報を発生する。ただし、溶
接電流の通電を開始してから予め設定される時間の範囲
内では、溶接部の温度が充分に上昇していないので、上
下限チェック手段47の処理のうち、少なくとも上限の
チェック機能は停止状態とする。次に、ステップa13
で、図2のリミッタ手段48によって、データメモリ4
2から読出した上限および下限に基づいて補正量を制限
し、溶接電流補正量30aとして導出する。In step a9, the result of the temperature comparison in the calculation means 45 is given to the dead zone setting means 46 in FIG. 2, and when the temperature deviation exceeds the predetermined dead zone range, the output corresponding to the deviation is checked for upper and lower limits. Given to the means 47. The upper / lower limit check means 47 performs the upper / lower limit check process of step a10 of FIG. 3, and when the deviation exceeds the upper / lower limit, the process proceeds from step a11 to step a12, and the large deviation alarm 38 issues an alarm. However, since the temperature of the welded portion has not risen sufficiently within a preset time range from the start of welding current application, at least the upper limit check function of the processing of the upper and lower limit check means 47 is performed. Set to the stopped state. Next, step a13
Then, the limiter means 48 shown in FIG.
The correction amount is limited based on the upper limit and the lower limit read from No. 2, and is derived as the welding current correction amount 30a.
【0030】ステップa14では、図2のリミッタ手段
48から導出された溶接電流補正量30aを図1の補正
装置34に与え、溶接電流設定装置29からの溶接電流
設定値を補正する。図3のステップa15では、補正さ
れた溶接電流に基づき、サイリスタスタック27の位相
角制御が行われ、上電極24aと、下電極24bとの間
で溶接電流の通電が行われる。ステップa16では、図
1の放射温度計25によって、溶接部付近の表面温度が
測定される。ステップa17では、シーム溶接が終了し
たか否かが判断される。終了していないと判断されると
きには、ステップa8に戻る。溶接が終了したと判断さ
れるときには、ステップa18で、設備異常検知装置3
3が表1に示すような設備異常を検知したか否かが判断
される。設備異常が検知されていないときには、ステッ
プa19で、図2の学習制御手段40によって、学習メ
モリ41に、平均温度演算手段43からの平均温度と、
データメモリ42からの目標温度との差の1/2を温度
修正量として記憶するという学習機能を能動化する。こ
のようにして、次々と金属帯の溶接を繰り返して行う。At step a14, the welding current correction amount 30a derived from the limiter means 48 of FIG. 2 is given to the correction device 34 of FIG. 1 to correct the welding current set value from the welding current setting device 29. In step a15 of FIG. 3, the phase angle control of the thyristor stack 27 is performed based on the corrected welding current, and the welding current is supplied between the upper electrode 24a and the lower electrode 24b. At step a16, the surface temperature near the weld is measured by the radiation thermometer 25 shown in FIG. At step a17, it is judged if the seam welding is completed. When it is determined that the processing has not ended, the processing returns to step a8. When it is determined that the welding is completed, in step a18, the equipment abnormality detection device 3
It is determined whether or not 3 has detected an equipment abnormality as shown in Table 1. When no equipment abnormality is detected, the average temperature from the average temperature calculation means 43 is stored in the learning memory 41 by the learning control means 40 of FIG. 2 in step a19.
The learning function of storing 1/2 of the difference from the target temperature from the data memory 42 as the temperature correction amount is activated. In this way, the welding of the metal strip is repeated one after another.
【0031】ステップa20では、後工程で溶接異常が
発生しているか否かを判断する。溶接異常が発生してい
るときには、図2の溶接異常入力装置39から学習制御
手段40にデータを与え、ステップa21で、学習メモ
リ41から関連する学習結果を除去する。ステップa2
2で、最終的に1つの溶接箇所についての処理を終了す
る。At step a20, it is judged whether or not a welding abnormality has occurred in the subsequent process. When a welding abnormality has occurred, data is given from the welding abnormality input device 39 of FIG. 2 to the learning control means 40, and in step a21, the related learning result is removed from the learning memory 41. Step a2
At 2, finally, the process for one welding point is completed.
【0032】図4は、図1および図2の実施例に好適に
使用されるシーム溶接機の機械的な構成を示す。図4
(a)は正面断面図、図4(b)は簡略化した斜視図を
それぞれ示す。先行材21および後行材22の通板方向
に対して、垂直な板幅方向に移動可能なキャリッジ50
には、ローラ状の上電極24aおよび下電極24bが取
付けられている。先行材21および後行材22の通板方
向に垂直に移動可能なように、キャリッジ50の底面に
は車輪51が設けられている。キャリッジ50が移動す
るときには、上電極24aおよび下電極24bが、先行
材21および後行材22の重ね代52の部分を上下から
押圧し、シーム溶接を行う。溶接の際には、図4(a)
に示すように、先行材21および後行材22は、出側ク
ランプ53および入側クランプ54によってそれぞれ保
持される。溶接部分の表面温度は、放射温度計25を用
いて監視される。FIG. 4 shows the mechanical construction of a seam welder preferably used in the embodiment of FIGS. 1 and 2. FIG.
4A is a front sectional view, and FIG. 4B is a simplified perspective view. A carriage 50 that is movable in the plate width direction perpendicular to the sheet passing direction of the preceding material 21 and the following material 22.
A roller-shaped upper electrode 24a and a lower electrode 24b are attached to the. Wheels 51 are provided on the bottom surface of the carriage 50 so that the preceding material 21 and the following material 22 can move vertically in the sheet passing direction. When the carriage 50 moves, the upper electrode 24a and the lower electrode 24b press the overlapping portion 52 of the preceding material 21 and the following material 22 from above and below to perform seam welding. At the time of welding, FIG. 4 (a)
As shown in, the leading material 21 and the trailing material 22 are held by the output side clamp 53 and the input side clamp 54, respectively. The surface temperature of the welded portion is monitored using a radiation thermometer 25.
【0033】図5には、本発明の他の実施例による処理
装置60に関連する構成を示す。本実施例は図2に示す
構成に類似し、処理装置60は図2の処理装置30に置
き換えられ、図2の構成に対応する部分には同一の参照
符を付す。本実施例において注目すべきは、α設定装置
61によって設定される比率α(0≦α≦1)を外部設
定可能であり、設定されたαの値を用いて、α演算手段
62が学習メモリ41およびデータメモリ42にストア
されているデータを用いて溶接電流の補正量の演算を行
うことである。また、学習制御手段63は、データメモ
リ42からの目標温度と、溶接温度26aとを比較し、
この差が予め設定される基準値よりも大きいときには、
溶接異常と判断し、学習メモリ41における学習の対象
から除外する。α演算手段62は、次の第2式に示すよ
うな演算を行う。FIG. 5 shows a configuration related to the processing apparatus 60 according to another embodiment of the present invention. The present embodiment is similar to the configuration shown in FIG. 2, the processing device 60 is replaced by the processing device 30 of FIG. 2, and the portions corresponding to the configuration of FIG. In this embodiment, it should be noted that the ratio α (0 ≦ α ≦ 1) set by the α setting device 61 can be externally set, and the α calculation means 62 uses the set value of α for learning memory. 41 and the data stored in the data memory 42 are used to calculate the correction amount of the welding current. Further, the learning control means 63 compares the target temperature from the data memory 42 with the welding temperature 26a,
When this difference is larger than the preset reference value,
It is determined that the welding is abnormal and is excluded from the learning target in the learning memory 41. The α calculation means 62 performs the calculation shown in the following second equation.
【0034】 C = α ・ A + (1−α)・ B …(2) ここで、AおよびBは、データメモリ42および学習メ
モリ41から読出される補正量のデータをそれぞれ示
し、Cは演算結果を示す。本実施例によれば、比率αの
値に従って、学習結果を利用する割合を調整することが
できる。たとえば、同じような条件で溶接を繰返して行
うときには、比率αの値を小さく、すなわち比率(1−
α)の値を大きくして、学習機能を充分に活用し、溶接
条件の変動が大きいときには比率αの値を小さく設定し
て、学習機能を殆ど停止した状態で溶接を行う。さら
に、溶接温度26aと、データメモリ42からの目標温
度の偏差が大きいときには、学習を停止するので、学習
メモリ41に学習されるデータの信頼性を高めることが
できる。C = αA + (1-α) B (2) Here, A and B represent the correction amount data read from the data memory 42 and the learning memory 41, respectively, and C represents the calculation. The results are shown. According to the present embodiment, it is possible to adjust the ratio of using the learning result according to the value of the ratio α. For example, when welding is repeatedly performed under similar conditions, the value of the ratio α is reduced, that is, the ratio (1-
The value of α) is increased to make full use of the learning function, and when the fluctuation of the welding conditions is large, the value of the ratio α is set to a small value and welding is performed with the learning function almost stopped. Further, when the deviation between the welding temperature 26a and the target temperature from the data memory 42 is large, the learning is stopped, so that the reliability of the data learned in the learning memory 41 can be improved.
【0035】図6は、本発明のさらに他の実施例による
処理装置70に関連する構成を示す。本実施例も図2の
構成に類似し、対応する部分には同一の参照符を付す。
本実施例の処理装置70は、図2の構成の処理装置30
に置き換えられる。注目すべきは、第1の学習メモリ7
1、第2の学習メモリ72およびデータ解析手段73を
含んで学習手段74が構成され、データ解析手段73を
学習制御手段75によって制御することである。先ず、
第1の学習メモリ71には、図1および図2に示す実施
例などと同様に、目標温度と、平均温度との差に基づく
修正量が学習される。データ解析手段73は、過去のデ
ータの平均値など、統計解析を行い、第2の学習メモリ
72に解析結果をストアする。データ解析手段73によ
ってデータ解析を行ってから、第2の学習メモリ72に
温度修正量に対するデータを学習するので、瞬時的な雑
音などの影響を受けずに、信頼性の高い学習を行うこと
ができる。FIG. 6 shows a configuration related to the processing apparatus 70 according to still another embodiment of the present invention. The present embodiment is also similar to the configuration of FIG. 2, and corresponding parts are designated by the same reference numerals.
The processing device 70 of this embodiment is the processing device 30 having the configuration of FIG.
Is replaced by It should be noted that the first learning memory 7
The learning means 74 is configured to include the first and second learning memories 72 and the data analysis means 73, and the data analysis means 73 is controlled by the learning control means 75. First,
The correction amount based on the difference between the target temperature and the average temperature is learned in the first learning memory 71, as in the embodiment shown in FIGS. 1 and 2. The data analysis unit 73 performs statistical analysis such as the average value of past data and stores the analysis result in the second learning memory 72. Since the data for the temperature correction amount is learned in the second learning memory 72 after the data analysis means 73 analyzes the data, it is possible to perform highly reliable learning without being affected by instantaneous noise or the like. it can.
【0036】以上の各実施例では、連続的に通板される
金属帯をシーム溶接する場合について説明しているけれ
ども、溶接部の重ね代を押し潰すマッシュシーム溶接で
あっても同様に本発明を適用することができる。むし
ろ、溶接条件がより厳しいマッシュシーム溶接におい
て、本発明は好適に実施され、信頼性の高い溶接を行う
ことができる。また、連続的なシーム溶接ばかりでな
く、スポット溶接を複数箇所行うようにしてもよく、ま
たコイル状の金属帯同士の溶接ばかりでなく、金属板同
士の溶接においても同様に適用することができる。In each of the above-mentioned embodiments, the case where seam welding is continuously performed on the metal strip has been described, but the present invention is also applicable to mash seam welding in which the overlap margin of the welded portion is crushed. Can be applied. Rather, in mash seam welding where the welding conditions are more severe, the present invention is preferably implemented and reliable welding can be performed. Further, not only continuous seam welding but also spot welding may be performed at a plurality of positions, and the same can be applied not only to welding of coil-shaped metal bands but also to welding of metal plates. .
【0037】さらに、各実施例では、放射温度計を用い
て溶接部付近の表面温度を検出しているけれども、熱電
対などの測温センサを溶接部表面に直接接触させて温度
を測定するようにしてもよい。Further, in each of the embodiments, the radiation thermometer is used to detect the surface temperature in the vicinity of the welded portion, but a temperature measuring sensor such as a thermocouple may be directly contacted with the surface of the welded portion to measure the temperature. You may
【0038】[0038]
【発明の効果】以上のように本発明によれば、溶接性に
及ぼす溶接温度に着目し、様々な変動要因が存在しても
溶接性が安定するように、溶接部の表面温度を常時測定
することによって監視し、溶接電流を制御して溶接性を
一定にすることができる。これによって、金属の通板ラ
インなどでは、種々の変動要因が生じても、製品の品質
には悪影響がなく、信頼性のよい安定な抵抗溶接を行う
ことができる。As described above, according to the present invention, paying attention to the welding temperature which affects the weldability, the surface temperature of the welded portion is constantly measured so that the weldability is stable even if there are various fluctuation factors. The welding current can be controlled and the welding current can be controlled to make the weldability constant. As a result, in the metal strip line or the like, even if various fluctuation factors occur, the quality of the product is not adversely affected, and reliable and stable resistance welding can be performed.
【0039】また本発明によれば、溶接条件と表面温度
との関係が学習され、学習結果に基づいて溶接電流を補
正し、溶接温度が一定の範囲内になるように制御するこ
とができる。様々な溶接条件と、溶接温度との関係は、
必ずしも単純ではないけれども、学習を行って溶接電流
の補正の精度を高め、最適な条件へ近付けてゆくことが
できる。Further, according to the present invention, the relationship between the welding condition and the surface temperature can be learned, the welding current can be corrected based on the learning result, and the welding temperature can be controlled to fall within a certain range. The relationship between various welding conditions and welding temperature is
Although not necessarily simple, learning can be performed to improve the accuracy of the welding current correction and approach the optimum conditions.
【0040】また本発明によれば、比率αを設定して、
溶接条件に基づく補正量と学習結果に基づく補正量とを
調整し、溶接電流を補正して最適な溶接温度に近付ける
制御を行うことができる。Further, according to the present invention, by setting the ratio α,
By adjusting the correction amount based on the welding condition and the correction amount based on the learning result, the welding current can be corrected to perform control to bring the welding temperature close to the optimum welding temperature.
【0041】また本発明によれば、溶接条件に異常があ
るときの表面温度の測定値との関係は学習を行わないの
で、溶接電流を補正する学習結果は、溶接条件が良好な
場合に対応するもののみであり、精度の高い溶接電流の
補正を行うことができる。Further, according to the present invention, since the relationship with the measured value of the surface temperature when the welding condition is abnormal is not learned, the learning result for correcting the welding current corresponds to the case where the welding condition is good. However, the welding current can be corrected with high accuracy.
【0042】また本発明によれば、溶接結果が異常と判
断されるときの溶接条件と表面温度の測定値との関係は
学習結果から除かれるので、溶接電流の補正の結果から
溶接結果が異常になる可能性は減少され、信頼性の高い
溶接を行うことができる。Further, according to the present invention, since the relationship between the welding condition and the measured value of the surface temperature when the welding result is judged to be abnormal is excluded from the learning result, the welding result is abnormal from the correction result of the welding current. The possibility of becoming welded is reduced, and reliable welding can be performed.
【0043】さらに本発明によれば、温度測定手段によ
って、溶接部の溶接温度に密接な関連のある表面温度を
監視し、条件検出手段によって検出される溶接条件と、
温度変化との関係を学習手段によって学習し、学習結果
に基づいて表面温度が目標範囲内になるように溶接電流
を電流補正手段が補正する。学習結果に基づいて温度補
正を行いながら溶接電流を制御して溶接温度が一定の範
囲内になるように抵抗溶接を行うので、安定した溶接品
質を容易に得ることができる。Further, according to the present invention, the temperature measuring means monitors the surface temperature closely related to the welding temperature of the welded portion, and the welding condition detected by the condition detecting means,
The relationship with the temperature change is learned by the learning means, and the current correction means corrects the welding current so that the surface temperature falls within the target range based on the learning result. Since resistance welding is performed so that the welding temperature is within a certain range by controlling the welding current while correcting the temperature based on the learning result, stable welding quality can be easily obtained.
【図1】本発明の一実施例の概略的な電気的構成を示す
ブロック図である。FIG. 1 is a block diagram showing a schematic electrical configuration of an embodiment of the present invention.
【図2】図1の実施例の処理装置30に関連する電気的
構成を示すブロック図である。FIG. 2 is a block diagram showing an electrical configuration related to the processing apparatus 30 of the embodiment of FIG.
【図3】図1および図2の実施例の動作を示すフローチ
ャートである。FIG. 3 is a flowchart showing the operation of the embodiment shown in FIGS. 1 and 2.
【図4】図1の実施例に用いる溶接機の概略的な構成を
示す正面断面図および斜視図である。FIG. 4 is a front sectional view and a perspective view showing a schematic configuration of a welding machine used in the embodiment of FIG.
【図5】本発明の他の実施例の処理装置に関連する電気
的構成を示すブロック図である。FIG. 5 is a block diagram showing an electrical configuration related to a processing apparatus of another embodiment of the present invention.
【図6】本発明のさらに他の実施例の処理装置に関連す
る電気的構成を示すブロック図である。FIG. 6 is a block diagram showing an electrical configuration related to a processing apparatus of still another embodiment of the present invention.
【図7】従来からのシーム溶接機の全体的な構成を示す
簡略化した斜視図である。FIG. 7 is a simplified perspective view showing the overall configuration of a conventional seam welder.
【図8】図7のシーム溶接機のキャリッジに関連する構
成を示す簡略化した斜視図である。8 is a simplified perspective view showing a configuration related to the carriage of the seam welding machine of FIG. 7. FIG.
21 先行材 22 後行材 23 溶接トランス 24 電極 24a 上電極 24b 下電極 25 放射温度計 26a 溶接温度 27 サイリスタスタック 28 電流検出器 29 溶接電流設定装置 30,60,70 処理装置 30a 溶接電流補正量 31 先行材データ設定装置 32 後行材データ設定装置 33 設備異常検知装置 34 補正装置 35 フィードバック装置 38 偏差大警報器 39 溶接異常入力装置 40,63,75 学習制御手段 41,71,72 学習メモリ 42 データメモリ 43 平均温度演算手段 44,45 演算手段 47 上下限チェック手段 50 キャリッジ 52 重ね代 61 α設定装置 62 α演算装置 21 Leading Material 22 Trailing Material 23 Welding Transformer 24 Electrode 24a Upper Electrode 24b Lower Electrode 25 Radiation Thermometer 26a Welding Temperature 27 Thyristor Stack 28 Current Detector 29 Welding Current Setting Device 30, 60, 70 Processing Device 30a Welding Current Correction Amount 31 Leading material data setting device 32 Subsequent material data setting device 33 Equipment abnormality detection device 34 Correction device 35 Feedback device 38 Large deviation alarm 39 Welding abnormality input device 40, 63, 75 Learning control means 41, 71, 72 Learning memory 42 data Memory 43 Average temperature calculation means 44, 45 Calculation means 47 Upper / lower limit check means 50 Carriage 52 Overlap margin 61 α setting device 62 α Calculation device
フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 FI 技術表示箇所 G05B 13/02 L 9131−3H Continuation of front page (51) Int.Cl. 6 Identification number Office reference number FI technical display location G05B 13/02 L 9131-3H
Claims (6)
法において、 溶接電流を検出し、 溶接時の表面温度を測定し、 測定された表面温度が目標範囲内になるように溶接電流
を補正することを特徴とする抵抗溶接方法。1. A method of resistance welding by stacking metal strips, comprising detecting a welding current, measuring a surface temperature during welding, and correcting the welding current so that the measured surface temperature falls within a target range. Resistance welding method characterized by.
の測定値との関係を学習しておき、学習結果に従って行
うことを特徴とする請求項1記載の抵抗溶接方法。2. The resistance welding method according to claim 1, wherein the correction of the welding current is performed in advance by learning the relationship between the welding condition and the measured value of the surface temperature and according to the learning result.
し、 溶接条件に対応する補正量に比率αを乗算し、 前記学習結果に基づく補正量に比率(1−α)を乗算
し、 これらの乗算結果の和で溶接電流の補正を行うことを特
徴とする請求項2記載の抵抗溶接方法。3. A ratio α is set within a range of 0 ≦ α ≦ 1, a correction amount corresponding to a welding condition is multiplied by a ratio α, and a correction amount based on the learning result is multiplied by a ratio (1-α). The resistance welding method according to claim 2, wherein the welding current is corrected by the sum of these multiplication results.
判断し、 異常があると判断されるときは、前記学習を行わないこ
とを特徴とする請求項2または3に記載の抵抗溶接方
法。4. The resistance according to claim 2, wherein it is judged whether or not there is an abnormality in welding conditions during welding, and when it is judged that there is an abnormality, the learning is not performed. Welding method.
か否かを判断し、 溶接結果が異常と判断されるときの溶接条件と表面温度
の測定値との関係は、学習結果から除くことを特徴とす
る請求項2〜4のいずれかに記載の抵抗溶接方法。5. It is determined whether or not there is an abnormality in the welding result of the metal strip, and the relationship between the welding condition and the measured value of the surface temperature when the welding result is determined to be abnormal is excluded from the learning result. The resistance welding method according to any one of claims 2 to 4, which is characterized in that.
置において、 溶接条件を検出する条件検出手段と、 溶接時の表面温度を測定する温度測定手段と、 条件検出手段および温度測定手段からの出力に応答し、
溶接条件と表面温度との関係を記憶する学習手段と、 温度測定手段および学習手段からの出力に応答し、表面
温度が目標範囲内になるように溶接電流を補正する電流
補正手段とを含むことを特徴とする抵抗溶接装置。6. In a device for resistance welding by stacking metal strips, condition detecting means for detecting welding conditions, temperature measuring means for measuring a surface temperature during welding, and output from the condition detecting means and the temperature measuring means. Respond,
Includes learning means that stores the relationship between welding conditions and surface temperature, and current correction means that responds to the outputs from the temperature measurement means and the learning means and that corrects the welding current so that the surface temperature falls within the target range. Resistance welding equipment.
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JP22711194A JP3534453B2 (en) | 1994-09-21 | 1994-09-21 | Resistance welding method and apparatus |
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JP3534453B2 JP3534453B2 (en) | 2004-06-07 |
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KR20010064158A (en) * | 1999-12-24 | 2001-07-09 | 이구택 | Apparatus for controlling a seam welding in cold rolling |
JP2003080372A (en) * | 2001-09-07 | 2003-03-18 | Miyachi Technos Corp | Joining device for covered wire |
JP2004510583A (en) * | 2000-09-21 | 2004-04-08 | マサチューセッツ・インスティチュート・オブ・テクノロジー | Spot welding apparatus and method for detecting welding conditions in real time |
NL1028829C2 (en) * | 2005-04-20 | 2006-10-23 | Fontijne Grotnes B V | Method and system for welding parts together. |
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CN110461526A (en) * | 2017-03-31 | 2019-11-15 | 杰富意钢铁株式会社 | The welding decision maker and welding determination method of band-like plate body |
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1994
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KR20010064158A (en) * | 1999-12-24 | 2001-07-09 | 이구택 | Apparatus for controlling a seam welding in cold rolling |
JP2004510583A (en) * | 2000-09-21 | 2004-04-08 | マサチューセッツ・インスティチュート・オブ・テクノロジー | Spot welding apparatus and method for detecting welding conditions in real time |
JP2003080372A (en) * | 2001-09-07 | 2003-03-18 | Miyachi Technos Corp | Joining device for covered wire |
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US8933362B2 (en) | 2005-04-20 | 2015-01-13 | Fontijne Grotnes B.V. | Method and system for welding parts together |
WO2014191611A1 (en) | 2013-05-29 | 2014-12-04 | Protomet Särkiniemi T:Mi | Welding control method and control apparatus |
CN110461526A (en) * | 2017-03-31 | 2019-11-15 | 杰富意钢铁株式会社 | The welding decision maker and welding determination method of band-like plate body |
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JP2020146704A (en) * | 2019-03-12 | 2020-09-17 | Jfeスチール株式会社 | Method and device for calculating welding quality determination set value and welding method |
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