JP2010149144A - Dust detection method - Google Patents

Dust detection method Download PDF

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JP2010149144A
JP2010149144A JP2008329138A JP2008329138A JP2010149144A JP 2010149144 A JP2010149144 A JP 2010149144A JP 2008329138 A JP2008329138 A JP 2008329138A JP 2008329138 A JP2008329138 A JP 2008329138A JP 2010149144 A JP2010149144 A JP 2010149144A
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resistance value
dust
threshold
equal
welding
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JP4772859B2 (en
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Seishin Numano
正慎 沼野
Junya Tanabe
順也 田辺
Tetsuo Hayashi
徹郎 林
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Honda Motor Co Ltd
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Honda Motor Co Ltd
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Priority to JP2008329138A priority Critical patent/JP4772859B2/en
Priority to US12/570,579 priority patent/US8969751B2/en
Priority to DE200910055086 priority patent/DE102009055086A1/en
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a dust detection method that prevents erroneous determination of taking noise generation as dust generation and that prevents malfunction of processing for dust generation based on the erroneous determination. <P>SOLUTION: The dust detection method includes: a first step S2 in which resistance value r of resistance welding is monitored and in which an amount of change rd per unit time of this resistance value is determined as equal to or higher than a first threshold T1; a second step S4 in which, after the first step, the resistance value of the resistance welding is monitored and in which an amount of change per unit time of this resistance value is determined as equal to or lower than a second threshold T2; a third step S5 in which a difference rD between a resistance value rm concerning calculation of the amount of change rd5 determined as equal to or higher than the first threshold in the first step and a resistance value r10 concerning calculation of the amount of change rd10 determined as equal to or lower than the second threshold in the second step is determined as not lower than a third threshold T3; and a fourth step S6 in which, when the difference is determined as not lower than the third threshold in the third step, dust is determined as being generated. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、スポット溶接などの抵抗溶接におけるチリ検出方法に関する。   The present invention relates to a dust detection method in resistance welding such as spot welding.

従来から、自動車の車体を溶接組立する製造ラインには、搬送装置によって搬送されるワークの所定箇所にスポット溶接作業を行う溶接ロボットが多数配置されている。これらの溶接ロボットは、ワークのあらかじめ設定された溶接箇所に適した形状を持つスポット溶接ガンを備えている。   2. Description of the Related Art Conventionally, many welding robots that perform spot welding work are arranged at predetermined locations on a workpiece conveyed by a conveyance device in a production line for welding and assembling a car body of an automobile. These welding robots include a spot welding gun having a shape suitable for a preset welding location of a workpiece.

この種の溶接ロボットでは、溶接電流の通電中は抵抗値の監視が行われる。この抵抗値の監視により、溶接電流の通電中にチリが発生すると、抵抗値が大幅に減少することが知られている。   In this type of welding robot, the resistance value is monitored while the welding current is applied. By monitoring this resistance value, it is known that if dust is generated during welding current application, the resistance value is greatly reduced.

このようなチリが発生した場合は、あらかじめ設定された溶接電流をあらかじめ設定された通電時間だけ通電し終わっても、溶接箇所の強度が不足する場合がある。これは、チリの発生によってナゲットの成長速度が低下し、ナゲットのサイズが小さくなるからである。   When such dust occurs, the strength of the welded portion may be insufficient even when the preset welding current is energized for a preset energization time. This is because the growth rate of the nugget decreases due to the generation of dust, and the size of the nugget becomes small.

そのため、溶接ロボットは、通電中に抵抗値が減少した場合はチリが発生したと判断して、溶接電流を止めたり、溶接電流を下げたり、溶接電流を上げたりなど、あらかじめ設定されたチリ発生時の処理を行うようにプログラミングされている(特許文献1参照)。   For this reason, if the resistance value decreases during energization, the welding robot determines that dust has occurred, and preset dust generation such as stopping the welding current, lowering the welding current, raising the welding current, etc. It is programmed to perform time processing (see Patent Document 1).

ところで、例えば、隣接する2台の溶接ロボットのスポット溶接ガンどうしが互いに接近した状態で溶接作業を行う場合、一方のスポット溶接ガンの磁場が他方のスポット溶接ガンの磁場に影響を与えることによって、抵抗値が一時的に下がることがある。このような抵抗値の減少は、一時的なもので、すぐに解消されるノイズであり、溶接の品質には実質的に影響を及ぼさない。
特開2006−55893号公報
By the way, for example, when performing a welding operation in a state where the spot welding guns of two adjacent welding robots are close to each other, the magnetic field of one spot welding gun affects the magnetic field of the other spot welding gun, The resistance value may decrease temporarily. Such a decrease in resistance is temporary and is a noise that is quickly eliminated, and does not substantially affect the quality of the weld.
JP 2006-55893 A

しかしながら、このようなノイズが発生した場合、抵抗値が減少することから、溶接ロボットはチリが発生したと誤判断する場合がある。溶接ロボットは、このような誤判断をした場合、溶接電流を止めたり、溶接電流を下げたり、溶接電流を上げたり、あらかじめ設定されたチリ発生時の処理を行う。   However, when such noise occurs, the resistance value decreases, so the welding robot may erroneously determine that dust has occurred. When such a misjudgment is made, the welding robot stops the welding current, lowers the welding current, increases the welding current, or performs a preset process when dust occurs.

このような誤判断に基づくチリ発生時の処理が行われると、溶接作業を無駄に停止したり、溶接電流を異常値に変更したりするなど、誤作動を起こしてしまう。   If the processing at the time of occurrence of dust based on such misjudgment is performed, malfunctions occur such as stopping the welding operation unnecessarily or changing the welding current to an abnormal value.

本発明は、上述の課題に鑑みてなされたものであり、ノイズの発生をチリの発生であると誤判断することを防止し、そのような誤判断に基づいてチリ発生時の処理を行う誤作動を防止することのできるチリ検出方法を提供することを目的とする。   The present invention has been made in view of the above-described problems, and prevents erroneous determination of noise generation as generation of dust, and an error in performing processing when generation of dust occurs based on such erroneous determination. An object of the present invention is to provide a dust detection method capable of preventing operation.

本発明のチリ検出方法は、抵抗溶接中にチリの発生を検出するチリ検出方法であって、前記抵抗溶接の抵抗値(例えば、後述の抵抗値r)を監視し、この抵抗値の単位時間当たりの変化量(例えば、後述の抵抗値変化量rd)が第1の閾値(例えば、後述の第1閾値T1)以上であるか否かを判定する第1の工程(例えば、後述のステップS2)と、前記第1の工程の後に、前記抵抗溶接の抵抗値を監視し、この抵抗値の単位時間当たりの変化量が第2の閾値(例えば、後述の第2閾値T2)以下であるか否かを判定する第2の工程(例えば、後述のステップS4)と、前記第1の工程で前記第1の閾値以上であると判定した変化量(例えば、後述の抵抗値変化量rd5)の算出に係る抵抗値(例えば、後述の抵抗値rm)と、前記第2の工程で前記第2の閾値以下であると判定した変化量(例えば、後述の抵抗値変化量rd10)の算出に係る抵抗値(例えば、後述の抵抗値r10)との差分(例えば、後述の差分rD)が、第3の閾値(例えば、後述の第3閾値T3)以上であるか否かを判定する第3の工程(例えば、後述のステップS5)と、前記第3の工程で前記差分が前記第3の閾値以上であると判定した場合に、チリが発生したと判定する第4の工程(例えば、後述のステップS6)と、を含むことを特徴とする。   The dust detection method of the present invention is a dust detection method for detecting the occurrence of dust during resistance welding, wherein the resistance value (for example, resistance value r described later) of the resistance welding is monitored, and the unit time of this resistance value is measured. A first step (for example, step S2 to be described later) for determining whether or not a hit change amount (for example, a resistance value change amount rd to be described later) is equal to or greater than a first threshold value (for example, a first threshold value T1 to be described later). ) And after the first step, the resistance value of the resistance welding is monitored, and whether the amount of change in the resistance value per unit time is equal to or less than a second threshold value (for example, a second threshold value T2 described later). A second step (for example, step S4 described later) for determining whether or not, and a change amount (for example, a resistance value change amount rd5 described later) determined to be greater than or equal to the first threshold value in the first step. A resistance value for calculation (for example, a resistance value rm described later) and the second process The difference (for example, a later-described difference rD) from the resistance value (for example, a later-described resistance value r10) for calculating the amount of change (for example, a later-described resistance value variation rd10) determined to be equal to or less than the second threshold value. ) Is greater than or equal to a third threshold value (for example, a third threshold value T3 described later), and the difference between the third step and the third step (for example, step S5 described later) And a fourth step (for example, step S6 described later) for determining that dust is generated when it is determined that the value is equal to or greater than the third threshold value.

この発明によれば、ノイズの発生をチリの発生であると誤判断することを防止し、そのような誤判断に基づいてチリ発生時の処理を行う誤作動を防止することができる。   According to the present invention, it is possible to prevent erroneously determining that noise is generated as dust, and to prevent malfunction that performs processing when dust occurs based on such erroneous determination.

本発明によれば、ノイズの発生をチリの発生であると誤判断することを防止し、そのような誤判断に基づいてチリ発生時の処理を行う誤作動を防止することができる。   According to the present invention, it is possible to prevent erroneously determining that noise is generated as dust, and to prevent malfunction that performs processing when dust occurs based on such erroneous determination.

以下、本発明の一実施形態について、図面を参照しながら説明する。
図1は、本発明に係るチリ検出方法を実施するスポット溶接装置10の概略的説明図である。
スポット溶接装置10は、重ね合せた被溶接部材1,2を加圧して溶接電流を流す一対の電極チップ3,4と、電極チップ3,4に所望の加圧力を与える加圧装置(不図示)と、加圧装置により加圧された被溶接部材1,2に電極チップ3,4を介して所望の溶接電流を供給する電力供給装置(不図示)と、これらを制御する制御装置5とを備える。
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic explanatory view of a spot welding apparatus 10 for implementing a dust detection method according to the present invention.
The spot welding apparatus 10 includes a pair of electrode tips 3 and 4 that pressurize the overlapped members 1 and 2 to flow welding current, and a pressurizing device (not shown) that applies a desired pressure to the electrode tips 3 and 4. ), A power supply device (not shown) for supplying a desired welding current to the welded members 1 and 2 pressurized by the pressurizing device via the electrode tips 3 and 4, and a control device 5 for controlling them. Is provided.

このように構成されたスポット溶接装置10において、溶接条件によってあらかじめ設定された溶接電流をあらかじめ設定された通電時間だけ、電極チップ3,4を介して被溶接部材1,2に流すことで、ナゲット6が所定の速度で成長して、溶接が行われる。   In the spot welding apparatus 10 configured in this manner, a nugget is caused by flowing a welding current set in advance according to welding conditions to the members to be welded 1 and 2 through the electrode tips 3 and 4 for a preset energization time. 6 grows at a predetermined speed and welding is performed.

制御装置5は、図2のフローチャートに従って、チリの発生を検出する。
スポット溶接の溶接電流通電開始後、まず、ステップS1では、制御装置5により抵抗値の監視を開始する。
つまり、所定時間おきに抵抗値を検出する。
具体的には、制御装置5が、時刻t1における抵抗値を検出してこの抵抗値をr1とし、時刻t1から単位時間後の時刻t2における抵抗値を検出してこの抵抗値をr2とする。制御装置5は、スポット溶接の開始から終了まで、同様にして単位時間おきに抵抗値を検出する。
The control device 5 detects the occurrence of dust according to the flowchart of FIG.
After starting the welding current energization of spot welding, first, in step S1, monitoring of the resistance value is started by the control device 5.
That is, the resistance value is detected every predetermined time.
Specifically, the control device 5 detects the resistance value at time t1 and sets this resistance value to r1, and detects the resistance value at time t2 after a unit time from time t1 and sets this resistance value to r2. The control device 5 similarly detects the resistance value every unit time from the start to the end of spot welding.

ステップS2では、制御装置5により監視する抵抗値の単位時間当たりの変化量が第1の閾値以上であるか否かを判定する。すなわち、制御装置5が、単位時間おきに抵抗値を検出して、単位時間を隔てた2点の各抵抗値に基づいて、抵抗値の単位時間当たりの変化量を算出する。そして、算出した単位時間当たりの抵抗値変化量が第1の閾値以上であるか否かを判定する。   In step S2, it is determined whether the amount of change per unit time of the resistance value monitored by the control device 5 is equal to or greater than a first threshold value. That is, the control device 5 detects the resistance value every unit time, and calculates the change amount per unit time of the resistance value based on the two resistance values separated by the unit time. Then, it is determined whether or not the calculated resistance value change amount per unit time is equal to or greater than a first threshold value.

この第1閾値は、チリが発生した場合に減少する抵抗値の減少度合いを、抵抗値の単位時間当たりの変化量の大きさで表したものである。
この判定がYESの場合は、その変化量の算出に係る抵抗値を記憶し、ステップS3に移り、NOの場合は、ステップS8に移る。
The first threshold value represents the degree of decrease in the resistance value that decreases when dust occurs, in terms of the amount of change in the resistance value per unit time.
If this determination is YES, the resistance value related to the calculation of the amount of change is stored, and the process proceeds to step S3. If the determination is NO, the process proceeds to step S8.

ステップS3では、制御装置5によりチリの可能性ありと判定する。   In step S3, the control device 5 determines that there is a possibility of dust.

ステップS4では、制御装置5により監視する抵抗値の単位時間当たりの変化量が第2閾値以下であるか否かを判定する。   In step S4, it is determined whether or not the change amount per unit time of the resistance value monitored by the control device 5 is equal to or less than the second threshold value.

この第2閾値は、チリの終了にともなって終息する抵抗値の減少度合いを、抵抗値の単位時間当たりの変化量の大きさで表したものである。
この判定がYESの場合は、ステップS5に移り、NOの場合は、ステップS4に戻る。
つまり、抵抗値の単位時間当たりの変化量が第2閾値以下になるまで、ステップS4の判定を繰り返す。
The second threshold value represents the degree of decrease in the resistance value that ends with the end of Chile as a magnitude of the amount of change in the resistance value per unit time.
If this determination is YES, the process proceeds to step S5, and if NO, the process returns to step S4.
That is, the determination in step S4 is repeated until the amount of change in resistance value per unit time becomes equal to or less than the second threshold value.

ステップS5では、制御装置5により、ステップS2で第1の閾値以上であると判定した変化量の算出に係る抵抗値を読み出し、この抵抗値と、ステップS4で第2の閾値以下であると判定した変化量の算出に係る抵抗値との差分が、第3の閾値以上であるか否かを判定する。   In step S5, the control device 5 reads out the resistance value related to the calculation of the change amount determined to be greater than or equal to the first threshold value in step S2, and determines that this resistance value and the second threshold value or less in step S4. It is determined whether the difference from the resistance value related to the calculated amount of change is equal to or greater than a third threshold value.

この第3閾値は、チリが発生した場合に減少する抵抗値の減少幅と、ノイズが発生した場合に減少する抵抗値の減少幅とを区別するためのものである。
第3閾値T3として、例えば5〜50μΩが設定される。
この判定がYESの場合は、ステップS6に移り、NOの場合は、ステップS8に移る。
The third threshold value is for distinguishing between a decrease range of the resistance value that decreases when dust occurs and a decrease range of the resistance value that decreases when noise occurs.
For example, 5 to 50 μΩ is set as the third threshold T3.
If this determination is YES, the process proceeds to step S6, and if NO, the process proceeds to step S8.

ステップS6では、制御装置5によりチリであると判定する。   In step S6, the control device 5 determines that it is dust.

ステップS7では、制御装置5によりチリに対する処理が行われる。すなわち、制御装置5が、チリに対する処理としてあらかじめプログラミングされている処理、例えば、溶接の電流を止める操作を行う処理、溶接の電流を下げる操作を行う処理、溶接の電流を上げる操作を行う処理などを行う。
そして、チリに対する所定の処理が行われた後、溶接作業は終了する。
In step S7, the control device 5 performs processing for dust. That is, the control device 5 is pre-programmed as processing for dust, for example, processing for stopping the welding current, processing for reducing the welding current, processing for increasing the welding current, etc. I do.
Then, after a predetermined process is performed on dust, the welding operation is finished.

一方、ステップS5の判定がNOで、ステップS8に移った場合、ステップS8では、制御装置5によりチリでないと判定する。   On the other hand, when the determination in step S5 is NO and the process proceeds to step S8, in step S8, the controller 5 determines that it is not dust.

また、ステップS2の判定がNOで、ステップS8に移った場合、ステップS8では、制御装置5によりチリでないと判定する。   Further, when the determination in step S2 is NO and the process proceeds to step S8, in step S8, the controller 5 determines that it is not dust.

続いて、ステップS9では、制御装置5により溶接が終了したか否かを判定する。すなわち、制御装置5が、あらかじめ設定された溶接プログラムを参照して、溶接が終了したか否かを判定する。   Subsequently, in step S9, the control device 5 determines whether or not the welding is finished. That is, the control device 5 refers to a preset welding program and determines whether or not the welding has been completed.

溶接が終了していなければ、ステップS9の判定がNOであるから、ステップS2に戻る。
ステップS5の判定がNOでステップS8に移り、さらにステップS9に移り、ステップS9の判定がNOでステップS2に移る場合は、溶接の途中でノイズが発生した後、溶接が終了するまで抵抗値の監視が続けられる。
If welding has not ended, the determination in step S9 is NO, and the process returns to step S2.
If the determination in step S5 is NO, the process proceeds to step S8, and further proceeds to step S9. If the determination in step S9 is NO and the process proceeds to step S2, the resistance value is maintained until welding is completed after noise is generated during welding. Monitoring continues.

また、ステップS2の判定がNOでステップS8に移り、さらにステップS9に移り、ステップS9の判定がNOでステップS2に移ることを繰り返している間は、抵抗値の単位時間当たりの変化量が第1閾値未満の状態を維持し続ける。すなわち、チリもノイズも発生しない正常な溶接作業が行われる。   Further, while the determination of step S2 is NO, the process proceeds to step S8, and further to step S9, and while the determination of step S9 is NO and the process proceeds to step S2, the change amount of the resistance value per unit time is the first. Continue to maintain a state below one threshold. That is, a normal welding operation that does not generate dust or noise is performed.

そして、溶接が終了すると、ステップS9の判定がYESになるから、溶接作業は正常終了する。   When the welding is completed, the determination in step S9 is YES, so that the welding operation is normally completed.

図3は、上記実施形態に係るチリ検出方法における溶接電流の通電時間と抵抗との関係を示すタイミングチャートである。
図3において、実線は、溶接作業の途中でチリが発生して、溶接作業が正常に行われない場合の通電時間と抵抗との関係を示す。また、破線は、比較のために、溶接作業の途中でノイズが発生するが、溶接作業は実質的に正常に行われる場合の通電時間と抵抗との関係を示す。さらに、2点鎖線は、溶接作業が正常に行われるときの通電時間と抵抗との関係を示す。
FIG. 3 is a timing chart showing the relationship between welding current application time and resistance in the dust detection method according to the embodiment.
In FIG. 3, the solid line indicates the relationship between the energization time and the resistance when the dust is generated during the welding operation and the welding operation is not normally performed. Further, for the purpose of comparison, a broken line indicates a relationship between the energization time and the resistance when noise is generated during the welding operation, but the welding operation is substantially performed normally. Furthermore, a two-dot chain line indicates a relationship between the energization time and the resistance when the welding operation is normally performed.

図3に実線で示すチリ発生の場合と、破線で示すノイズ発生の場合とを比較すると、両者には共通点および相違点がある。両者の共通点は、チリ発生またはノイズ発生にともなって共に抵抗値が落ち込むことである。また、両者の相違点は、抵抗値の落ち込み度合いが顕著に相違することである。すなわち、実線で示すチリ発生の場合は、抵抗値の落ち込み量が非常に大きくて、しかも落ち込みが終わっても正常なレベルに復帰していない。これに対して、破線で示すノイズ発生の場合は、抵抗値の落ち込み量が比較的小さくて、しかも落ち込んだ後すぐに正常なレベルまで復帰する。   When the dust generation indicated by the solid line in FIG. 3 is compared with the noise generation indicated by the broken line, there is a common point and a difference between the two. The common point between the two is that the resistance value decreases with the occurrence of dust or noise. The difference between the two is that the degree of drop in resistance value is significantly different. That is, in the case of occurrence of dust indicated by a solid line, the amount of decrease in resistance value is very large, and even when the decrease ends, it does not return to a normal level. On the other hand, in the case of noise generation indicated by a broken line, the amount of decrease in the resistance value is relatively small, and returns to a normal level immediately after the decrease.

図3に実線で示すように、溶接作業の途中でチリが発生する場合は、図2に示すフローチャートに従ってつぎのように判断される。
すなわち、制御装置5により抵抗値の監視を開始する。つまり、単位時間おきに抵抗値r2を検出する。
時刻t1では、抵抗値r1を検出し、単位時間後の時刻t2では、抵抗値r2を検出する。そして、抵抗値r1と抵抗値r2との差分を抵抗値変化量rd1として算出する。抵抗値変化量rd1は、第1閾値T1以上ではないため、チリでないと判定する。
単位時間後の時刻t3では、抵抗値r3を検出する。そして、抵抗値r2と抵抗値r3との差分を抵抗値変化量rd2として算出する。抵抗値変化量rd2は、第1閾値T1以上ではないため、チリでないと判定する。
それぞれ単位時間後の各時刻t4,t5では、抵抗値r4,r5を検出する。そして、抵抗値r3と抵抗値r4との差分を抵抗値変化量rd3、抵抗値r4と抵抗値r5との差分を抵抗値変化量rd4として算出する。抵抗値変化量rd3,rd4は、第1閾値T1以上ではないため、チリでないと判定する。
As shown by the solid line in FIG. 3, when dust occurs during the welding operation, the following determination is made according to the flowchart shown in FIG.
That is, the control device 5 starts monitoring the resistance value. That is, the resistance value r2 is detected every unit time.
At time t1, the resistance value r1 is detected, and at time t2 after the unit time, the resistance value r2 is detected. Then, the difference between the resistance value r1 and the resistance value r2 is calculated as the resistance value change amount rd1. Since the resistance value change amount rd1 is not equal to or greater than the first threshold value T1, it is determined that it is not dust.
At time t3 after the unit time, the resistance value r3 is detected. Then, the difference between the resistance value r2 and the resistance value r3 is calculated as the resistance value change amount rd2. Since the resistance value change amount rd2 is not equal to or greater than the first threshold T1, it is determined that the resistance value change amount rd2 is not dust.
At each time t4 and t5 after the unit time, the resistance values r4 and r5 are detected. Then, the difference between the resistance value r3 and the resistance value r4 is calculated as the resistance value change amount rd3, and the difference between the resistance value r4 and the resistance value r5 is calculated as the resistance value change amount rd4. Since the resistance value change amounts rd3, rd4 are not equal to or greater than the first threshold value T1, it is determined that they are not dust.

単位時間後の時刻t6では、抵抗値r6を検出する。そして、抵抗値r5と抵抗値r6との差分を抵抗値変化量rd5として算出する。抵抗値変化量rd5は、第1閾値T1以上であるため、チリの可能性ありと判定する。   At time t6 after the unit time, the resistance value r6 is detected. Then, the difference between the resistance value r5 and the resistance value r6 is calculated as the resistance value change amount rd5. Since the resistance value change amount rd5 is equal to or greater than the first threshold value T1, it is determined that there is a possibility of dust.

単位時間後の時刻t7では、抵抗値r7を検出する。そして、抵抗値r6と抵抗値r7との差分を抵抗値変化量rd6として算出する。抵抗値変化量rd6は、第2閾値T2以下ではない。
それぞれ単位時間後の各時刻t8,t9,t10では、抵抗値r8,r9,r10を検出する。そして、抵抗値r7と抵抗値r8との差分を抵抗値変化量rd7、抵抗値r8と抵抗値r9との差分を抵抗値変化量rd8、抵抗値r9と抵抗値r10との差分を抵抗値変化量rd9として算出する。抵抗値変化量rd7,rd8,rd9は、第2閾値T2以下ではない。
At time t7 after the unit time, the resistance value r7 is detected. Then, the difference between the resistance value r6 and the resistance value r7 is calculated as the resistance value change amount rd6. The resistance value change amount rd6 is not less than or equal to the second threshold value T2.
The resistance values r8, r9, r10 are detected at times t8, t9, t10, respectively, after the unit time. The difference between the resistance value r7 and the resistance value r8 is the resistance value change amount rd7, the difference between the resistance value r8 and the resistance value r9 is the resistance value change amount rd8, and the difference between the resistance value r9 and the resistance value r10 is the resistance value change. Calculated as a quantity rd9. The resistance value change amounts rd7, rd8, and rd9 are not less than or equal to the second threshold value T2.

単位時間後の時刻t11では、抵抗値r11を検出する。そして、抵抗値r10と抵抗値r11との差分を抵抗値変化量rd10として算出する。抵抗値変化量rd10は、第2閾値T2以下である。   At time t11 after the unit time, the resistance value r11 is detected. Then, the difference between the resistance value r10 and the resistance value r11 is calculated as the resistance value change amount rd10. The resistance value change amount rd10 is equal to or less than the second threshold value T2.

ここで、抵抗値変化量rd10が第2閾値T2以下になったため、時刻t6での抵抗値変化量rd5の算出に係る抵抗値rmと、時刻t11での抵抗値変化量rd10の算出に係る抵抗値r10との差分を算出する。この差分rDは、第3閾値T3以上の差分rDsとなるため、チリであると判定する。   Here, since the resistance value change amount rd10 is equal to or less than the second threshold value T2, the resistance value rm related to the calculation of the resistance value change amount rd5 at time t6 and the resistance related to the calculation of the resistance value change amount rd10 at time t11. The difference from the value r10 is calculated. Since this difference rD is the difference rDs greater than or equal to the third threshold T3, it is determined that the difference is Chile.

図3に破線で示すように、溶接作業の途中でノイズが発生する場合は、図2に示すフローチャートに従ってつぎのように判断される。
すなわち、制御装置5により抵抗値の監視を開始する。
各時刻t1,t2,t3,t4,t5では、抵抗値r1,r2,r3,r4,r5を検出する。そして、抵抗値r1と抵抗値r2との差分を抵抗値変化量rd1、抵抗値r2と抵抗値r3との差分を抵抗値変化量rd2、抵抗値r3と抵抗値r4との差分を抵抗値変化量rd3、抵抗値r4と抵抗値r5との差分を抵抗値変化量rd4として算出する。抵抗値変化量rd1,rd2,rd3,rd4は、第1閾値T1以上ではないため、チリでないと判定する。
As shown by a broken line in FIG. 3, when noise occurs during the welding operation, the following determination is made according to the flowchart shown in FIG.
That is, the control device 5 starts monitoring the resistance value.
At each time t1, t2, t3, t4, t5, resistance values r1, r2, r3, r4, r5 are detected. The difference between the resistance value r1 and the resistance value r2 is the resistance value change amount rd1, the difference between the resistance value r2 and the resistance value r3 is the resistance value change amount rd2, and the difference between the resistance value r3 and the resistance value r4 is the resistance value change. The amount rd3, the difference between the resistance value r4 and the resistance value r5 is calculated as the resistance value change amount rd4. Since the resistance value change amounts rd1, rd2, rd3, and rd4 are not equal to or greater than the first threshold value T1, it is determined that they are not Chile.

単位時間後の時刻t6では、抵抗値r6を検出する。そして、抵抗値r5と抵抗値r6との差分を抵抗値変化量rd5として算出する。抵抗値変化量rd5は、第1閾値T1以上であるため、チリの可能性ありと判定する。   At time t6 after the unit time, the resistance value r6 is detected. Then, the difference between the resistance value r5 and the resistance value r6 is calculated as the resistance value change amount rd5. Since the resistance value change amount rd5 is equal to or greater than the first threshold value T1, it is determined that there is a possibility of dust.

各時刻t7,t8,t9では、抵抗値(r7),(r8),(r9)を検出する。そして、抵抗値r6と抵抗値(r7)との差分を抵抗値変化量(rd6)、抵抗値(r7)と抵抗値(r8)との差分を抵抗値変化量(rd7)、抵抗値(r8)と抵抗値(r9)との差分を抵抗値変化量(rd8)として算出する。抵抗値変化量(rd6),(rd7),(rd8)は、第2閾値T2以下ではない。   At each time t7, t8, t9, resistance values (r7), (r8), (r9) are detected. The difference between the resistance value r6 and the resistance value (r7) is the resistance value change amount (rd6), the difference between the resistance value (r7) and the resistance value (r8) is the resistance value change amount (rd7), and the resistance value (r8). ) And the resistance value (r9) is calculated as a resistance value change amount (rd8). The resistance value change amounts (rd6), (rd7), and (rd8) are not less than or equal to the second threshold T2.

単位時間後の時刻t10では、抵抗値(r10)を検出する。そして、抵抗値(r9)と抵抗値(r10)との差分を抵抗値変化量(rd9)として算出する。抵抗値変化量(rd9)は、第2閾値T2以下である。   At time t10 after the unit time, the resistance value (r10) is detected. Then, the difference between the resistance value (r9) and the resistance value (r10) is calculated as the resistance value change amount (rd9). The resistance value change amount (rd9) is equal to or less than the second threshold value T2.

ここで、抵抗値変化量(rd9)が第2閾値T2以下になったため、時刻t6での抵抗値変化量rd5の算出に係る抵抗値rmと、時刻t10での抵抗値変化量(rd9)の算出に係る抵抗値(r9)との差分を算出する。この差分rDは、第3閾値T3より小さい差分rDnとなるため、チリでないと判定する。   Here, since the resistance value change amount (rd9) is equal to or less than the second threshold value T2, the resistance value rm related to the calculation of the resistance value change amount rd5 at time t6 and the resistance value change amount (rd9) at time t10. The difference from the calculated resistance value (r9) is calculated. Since the difference rD is a difference rDn smaller than the third threshold T3, it is determined that the difference is not Chile.

本実施形態によれば、以下のような効果がある。
(1)制御装置5により、ノイズの発生をチリの発生であると誤判断することを防止し、そのような誤判断に基づいてチリ発生時の処理を行う誤作動を防止することができる。
According to this embodiment, there are the following effects.
(1) The control device 5 can prevent the occurrence of noise from being erroneously determined as the occurrence of dust, and can prevent the malfunction that performs processing when the dust is generated based on such erroneous determination.

(2)時刻t11で抵抗値r11を検出したと同時に差分rDsを算出してチリであると判定するので、制御遅れが生じない。   (2) Since the difference rDs is calculated at the same time when the resistance value r11 is detected at the time t11 and it is determined that it is dust, no control delay occurs.

なお、本発明は上記実施形態に限定されるものではなく、本発明の目的を達成できる範囲での変形、改良等は本発明に含まれるものである。   It should be noted that the present invention is not limited to the above-described embodiment, and modifications, improvements, etc. within a scope that can achieve the object of the present invention are included in the present invention.

本発明に係るチリ検出方法を実施するスポット溶接装置の概略的説明図である。It is a schematic explanatory drawing of the spot welding apparatus which implements the dust detection method concerning the present invention. 本発明に係るチリ検出方法の一実施形態におけるフローチャートである。It is a flowchart in one Embodiment of the dust detection method which concerns on this invention. 上記実施形態に係るチリ検出方法における溶接電流の通電時間と抵抗との関係を示すタイミングチャートである。It is a timing chart which shows the relationship between the energization time of welding current and resistance in the dust detection method concerning the above-mentioned embodiment.

符号の説明Explanation of symbols

1,2…被溶接部材
3,4…電極チップ
5…制御装置
6…ナゲット
10…スポット溶接装置
DESCRIPTION OF SYMBOLS 1, 2 ... Member to be welded 3, 4 ... Electrode tip 5 ... Control apparatus 6 ... Nugget 10 ... Spot welding apparatus

Claims (1)

抵抗溶接中にチリの発生を検出するチリ検出方法であって、
前記抵抗溶接の抵抗値を監視し、この抵抗値の単位時間当たりの変化量が第1の閾値以上であるか否かを判定する第1の工程と、
前記第1の工程の後に、前記抵抗溶接の抵抗値を監視し、この抵抗値の単位時間当たりの変化量が第2の閾値以下であるか否かを判定する第2の工程と、
前記第1の工程で前記第1の閾値以上であると判定した変化量の算出に係る抵抗値と、前記第2の工程で前記第2の閾値以下であると判定した変化量の算出に係る抵抗値との差分が、第3の閾値以上であるか否かを判定する第3の工程と、
前記第3の工程で前記差分が前記第3の閾値以上であると判定した場合に、チリが発生したと判定する第4の工程と、
を含むことを特徴とするチリ検出方法。
A dust detection method for detecting generation of dust during resistance welding,
A first step of monitoring a resistance value of the resistance welding and determining whether or not a change amount of the resistance value per unit time is equal to or greater than a first threshold;
A second step of monitoring the resistance value of the resistance welding after the first step and determining whether or not the amount of change per unit time of the resistance value is equal to or less than a second threshold;
A resistance value related to the calculation of the amount of change determined to be greater than or equal to the first threshold value in the first step, and a calculation of the amount of change determined to be equal to or less than the second threshold value in the second step. A third step of determining whether the difference from the resistance value is equal to or greater than a third threshold;
A fourth step of determining that dust has occurred when it is determined in the third step that the difference is equal to or greater than the third threshold;
A method for detecting dust.
JP2008329138A 2008-12-25 2008-12-25 Chile detection method Expired - Fee Related JP4772859B2 (en)

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US12/570,579 US8969751B2 (en) 2008-12-25 2009-09-30 Method of detecting dust and method of preventing erroneous determination of dust detection
DE200910055086 DE102009055086A1 (en) 2008-12-25 2009-12-21 Method for detecting dust and method for preventing erroneous determination of dust detection

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JPH05123873A (en) * 1991-11-06 1993-05-21 Na Detsukusu:Kk Resistance welding control method
JPH0671457A (en) * 1992-06-29 1994-03-15 Na Detsukusu:Kk Resistance welding controller
JPH0663765A (en) * 1992-08-21 1994-03-08 Omron Corp Method for measuring welding resistance and welding equipment where the measuring method is carried out
JP2000301348A (en) * 1999-04-26 2000-10-31 Dengensha Mfg Co Ltd Method for controlling current for resistance welding machine and its device
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