JP2873604B2 - Electrode tip wear level detector - Google Patents
Electrode tip wear level detectorInfo
- Publication number
- JP2873604B2 JP2873604B2 JP10084390A JP10084390A JP2873604B2 JP 2873604 B2 JP2873604 B2 JP 2873604B2 JP 10084390 A JP10084390 A JP 10084390A JP 10084390 A JP10084390 A JP 10084390A JP 2873604 B2 JP2873604 B2 JP 2873604B2
- Authority
- JP
- Japan
- Prior art keywords
- light
- tip
- electrode
- electrode tip
- dresser
- 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.)
- Expired - Lifetime
Links
- 238000003466 welding Methods 0.000 claims description 26
- 238000007493 shaping process Methods 0.000 description 6
- 238000001514 detection method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
Landscapes
- Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
- Length Measuring Devices By Optical Means (AREA)
Description
【発明の詳細な説明】 ［産業上の利用分野］ 本発明は、スポット溶接機，プロジェクション溶接機
等の抵抗溶接機にあって、その電極チップの損耗度を検
知して、該電極チップの整形または交換時期を判定する
電極チップの損耗度検知装置に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a resistance welding machine such as a spot welding machine or a projection welding machine, which detects the degree of wear of the electrode tip and shapes the electrode tip. Also, the present invention relates to a device for detecting a degree of wear of an electrode tip for determining a replacement time.
［従来技術］ スポット溶接機にあって、その電極チップには溶接時
に大きな負荷が掛かり、かつ大電流が流れるため、先端
が摩耗したり被溶接物の金属が付着して汚れ易く、これ
を放置しておくと溶接品質の劣化がみられるので、適時
に電極チップを所定形状に研削して整形を施す必要があ
る。[Prior art] In a spot welder, a large load is applied to the electrode tip during welding and a large current flows, so that the tip is worn and the metal of the workpiece adheres easily and becomes dirty. If this is done, the welding quality will be degraded, so it is necessary to grind the electrode tip into a predetermined shape and shape it in a timely manner.
ところで、溶接用ロボットを用いる場合には、その位
置が手の届かないところに配設されることがあり、また
作業の連続性を維持する必要があるために、人手による
整形処理は適さない。By the way, when a welding robot is used, its position may be located out of reach, and it is necessary to maintain the continuity of the work, so that manual shaping is not suitable.
そこで、該電極チップの整形処理に対応するために、
実開昭63−133886号等に開示されているチップドレッサ
が設けられている。Therefore, in order to cope with the shaping process of the electrode tip,
A tip dresser disclosed in Japanese Utility Model Laid-Open No. 63-133886 or the like is provided.
［発明が解決しようとする問題点］ ところで従来は、このチップドレッサにより研削処理
するタイミングを、溶接打点数制御により一律に行なっ
ていた。このため、電極チップの損耗度が低く整形処理
を要しないにもかかわらず、チップドレッサにより電極
チップを削成することとなり、該電極チップの寿命を早
めたり、または電極チップの汚れが激しいにもかかわら
ず、所定回数に達していないために溶接作業を継続する
こととなり、溶接品質を低下させる等の問題を生じてい
た。[Problems to be Solved by the Invention] Conventionally, the timing of the grinding process using the tip dresser has been uniformly performed by controlling the number of welding points. For this reason, although the degree of wear of the electrode tip is low and shaping is not required, the electrode tip is shaved by the tip dresser, and the life of the electrode tip is shortened, or even if the electrode tip is extremely dirty. Regardless, the welding operation is continued because the number of times has not reached the predetermined number, and problems such as deterioration of welding quality have occurred.
またブレードの損耗等によりチップドレッサにより適
正に研削しえない場合があるが、このような場合にもそ
のまま次の溶接工程に移行することとなり、溶接品質が
ますます劣化してしまうといったこともおき得る。In some cases, it may not be possible to properly grind the tip dresser due to wear of the blade, etc., but in such a case, the welding process will be shifted to the next one and the welding quality will deteriorate further. obtain.
さらにまたチップドレッサを用いない場合にあっても
電極チップの状態を作業者が確認する必要を生じて、熟
練を要すると共に、作業性が悪いという問題点があっ
た。Furthermore, even when the tip dresser is not used, the operator needs to check the state of the electrode tip, which requires skill and has poor workability.
本発明はこのような従来の問題点を除去し、電極チッ
プの損耗状態を自動的に判別し得る電極チップの損耗度
検知装置の提供を目的とするものである。SUMMARY OF THE INVENTION An object of the present invention is to eliminate such a conventional problem and to provide an electrode tip wear degree detecting device capable of automatically determining the wear state of an electrode tip.
［問題点を解決するための手段］ 本発明は、抵抗溶接機に取付けられて被溶接物に電流
を印加する電極チップの先端に光を照射する投光素子
と、その反射波を捕捉する受光素子とを備え、さらに前
記受光素子により捕捉された光の反射波強度を所定閾値
と比較して電極チップの損耗度を判定し、判定信号を発
生する信号判別装置を備えてなるものである。[Means for Solving the Problems] The present invention provides a light emitting element attached to a resistance welding machine for applying light to the tip of an electrode tip for applying a current to an object to be welded, and a light receiving element for capturing a reflected wave of the light emitting element. And a signal discriminating device for comparing the intensity of the reflected wave of the light captured by the light receiving element with a predetermined threshold to determine the degree of wear of the electrode chip and generating a determination signal.
［作用］ 投光素子から電極チップの先端に照射された光の反射
波強度は、先端の表面が適正な状態にある場合には強
く、一方、先端表面の汚れ、変形等の損耗が激しくなる
に従って弱くなる。そこで、この反射波を受光素子によ
り捕捉し、その信号レベルをあらかじめ定めた閾値と比
較する。そしてその閾値に対応して電極チップ表面の損
耗度を判定し、信号判別装置から判定信号を発生させ
る。[Operation] The reflected wave intensity of the light emitted from the light emitting element to the tip of the electrode tip is strong when the surface of the tip is in an appropriate state, while on the other hand, the surface of the tip is greatly damaged by dirt, deformation and the like. Weakens according to Therefore, the reflected wave is captured by the light receiving element, and the signal level is compared with a predetermined threshold. Then, the degree of wear of the electrode chip surface is determined according to the threshold value, and a determination signal is generated from the signal determination device.
この判定信号は、溶接用ロボット等の作動制御信号と
して用いて電極チップをチップドレッサに掛けたり、ま
たは溶接作業を継続させるようにする。This determination signal is used as an operation control signal for a welding robot or the like so that the electrode tip is put on the tip dresser or the welding operation is continued.
またはこの判別信号により、出力表示装置を駆動して
電極チップの状態を視認できるようにする。Alternatively, the output display device is driven by the determination signal so that the state of the electrode chip can be visually recognized.
［実施例］ 添付図面について本発明の一実施例を説明する。Embodiment An embodiment of the present invention will be described with reference to the accompanying drawings.
第１図にあってスポット溶接機１には電極チップ2a,2
bが作業間隔を置いて上下に対設されている。In FIG. 1, the electrode tips 2a, 2
b is vertically opposed with a working interval.
そして前記電極チップ2a,2bの両側には投光素子ｘを
備えた投光装置３と、受光素子ｙを備えた受光装置４と
が配設され、その光の照射方向及び受光方向を下部の電
極チップ2bの先端に向けている。該投光装置3,受光装置
４は、据付台５に取付けられる。この据付台５は溶接作
業の邪魔にならない位置でスポット溶接機１側に固定す
るか、または別位置に設けておいて、溶接用ロボットに
より電極チップ2a,2bを投光装置3,受光装置４間に移動
させても良い。On both sides of the electrode chips 2a and 2b, a light projecting device 3 having a light projecting element x and a light receiving device 4 having a light receiving element y are arranged, and the irradiation direction and the light receiving direction of the light are set in the lower part. It faces the tip of the electrode tip 2b. The light projecting device 3 and the light receiving device 4 are mounted on a mounting table 5. The mounting table 5 may be fixed to the spot welding machine 1 at a position where it does not hinder the welding operation, or may be provided at another position, and the electrode chips 2a and 2b are projected by the welding robot to the light projecting device 3 and the light receiving device 4. It may be moved between.
この実施例にあっては電極チップ2aは電極チップ2bと
ほぼ同様な状態であると仮定して、電極チップ2bの状態
のみを検知するようにしているが、電極チップ2a,2bの
状態検知を各個に行なっても良い。In this embodiment, the electrode tip 2a is assumed to be in a state substantially similar to the electrode tip 2b, and only the state of the electrode tip 2b is detected, but the state detection of the electrode tips 2a and 2b is performed. It may be performed for each individual.
前記投光装置3,受光装置４は取付け軸６を中心とし
て、円弧状長孔７に挿通した連結軸８を該長孔７を案内
として摺動することにより、その投光素子ｘ及び発光素
子ｙの投光及び受光方向を調整し得るようにしている。The light projecting device 3 and the light receiving device 4 are slid about a mounting shaft 6 with a connecting shaft 8 inserted through an arc-shaped long hole 7 as a guide of the long hole 7 so that the light projecting element x and the light emitting element The projection and reception directions of y can be adjusted.
第２図は前記投光装置３の構成を示し、発振器19から
の出力パルスに基づいて駆動回路11を駆動し、投光素子
ｘに電圧を印加するようにしてなり、さらには投光素子
ｘからの発光量を適正とするために、投光素子ｘからの
光をフィードバック用受光素子13により受け、その出力
をアンプ14を介して制御回路15に導入し、前記駆動回路
11を制御するようにしている。FIG. 2 shows the configuration of the light projecting device 3, in which a driving circuit 11 is driven based on an output pulse from an oscillator 19 to apply a voltage to the light projecting device x. In order to make the amount of light emitted from the light emitting device appropriate, the light from the light emitting element x is received by the light receiving element 13 for feedback, and the output thereof is introduced into the control circuit 15 via the amplifier 14, and the driving circuit
11 to control.
前記受光装置４からの出力信号は判別装置20に入力さ
れる。The output signal from the light receiving device 4 is input to the discriminating device 20.
この判別装置20は、前記受光素子ｙにより捕捉された
光の反射波強度を比較回路21に設定された高閾値l1と低
閾値l2と比較して出力回路22から電極チップの損耗度に
対応する判定信号『Ｈ』，『Ｍ』，『Ｌ』を発生する。The discriminating device 20 compares the intensity of the reflected wave of the light captured by the light receiving element y with the high threshold value l 1 and the low threshold value l 2 set in the comparison circuit 21 to determine the degree of wear of the electrode tip from the output circuit 22. The corresponding judgment signals "H", "M" and "L" are generated.
すなわち比較回路22に入力された光の反射波強度に対
応する出力信号のレベルが高閾値l1以上であるとこれを
最適状態である『Ｈ』と判定し、高閾値l1と低閾値l2と
の間のときは中等状態である『Ｍ』と判定し、低閾値l2
以下であると要整形状態である『Ｌ』と判定する。That level of the output signal corresponding to the reflected wave intensity of light input to the comparison circuit 22 is in an optimal state so that a high threshold l 1 or more is determined as "H", a high threshold l 1 and a low threshold l a moderate state when between 2 determines "M", the low threshold l 2
If it is below, it is determined to be "L", which is a shaping required state.
前記高閾値l1,低閾値l2は判別装置20に設けられたキ
ースイッチ等により数値入力することにより随意に設定
できる。この高閾値l1は、電極チップ2a,2bを最適条件
下において投光装置3,受光装置４により検査した際の反
射波強度を基準として定められる。また低閾値l2は電極
チップ2a,2bの損耗度（汚れ、変形等）の限界状態にお
ける反射波強度を基準として定められる。The high threshold value l 1 and the low threshold value l 2 can be arbitrarily set by inputting numerical values using a key switch or the like provided in the discrimination device 20. The high threshold l 1 is defined electrode tip 2a, 2b of the light projecting device 3 in optimum conditions, the reflected wave intensity when examined by the light receiving unit 4 as a reference. The low threshold l 2 is the electrode tip 2a, 2b of the wear degree (dirt, deformation, etc.) is determined based on the reflected wave intensity at the limit state of.
また判別装置20はデジタル表示窓からなる設定値表示
部24a,24b及び測定値表示部25と、判定信号『Ｈ』，
『Ｍ』，『Ｌ』に対応する三個の発光ダイオードからな
る出力表示部25とを設けられた表示パネル23を備える。Further, the discriminating device 20 includes a set value display section 24a, 24b and a measured value display section 25 each having a digital display window, and a judgment signal "H",
It has a display panel 23 provided with an output display section 25 composed of three light emitting diodes corresponding to "M" and "L".
この設定値表示部24aには上述のように数値入力され
た任意の高閾値l1が表示され、設定値表示部24bには低
閾値l2が同じく表示される。また測定値表示部25には前
記受光素子ｙで捕捉された信号強度が逐次表示される。This is the setting value display unit 24a any high threshold l 1 that is numerically inputted as described above is displayed, the setting value display section 24b low threshold l 2 is displayed again. Further, the measured value display section 25 sequentially displays the signal intensity captured by the light receiving element y.
而して、溶接が完了する毎に、または所定回数の溶接
後に、投光装置３から光を照射し、受光装置４によりそ
の反射光を捕捉して上述のように判定を行ない、出力表
示部26の所定発光ダイオードを点灯して当該判定結果を
示すと共に、出力回路22から上記判定結果に対応する出
力値の作動制御信号を発生する。Thus, each time welding is completed or after a predetermined number of weldings, light is emitted from the light projecting device 3 and the reflected light is captured by the light receiving device 4 to make the determination as described above. The predetermined light emitting diode 26 is turned on to indicate the determination result, and the output circuit 22 generates an operation control signal having an output value corresponding to the determination result.
そしてこの判定結果が『Ｌ』の場合には前記作動制御
信号により溶接用ロボットを駆動して電極チップ2a,2b
をチップドレッサ30側に移動させる。When the result of the determination is "L", the welding robot is driven by the operation control signal and the electrode tips 2a, 2b
To the tip dresser 30 side.
このチップドレッサ30を第３図について説明する。 The tip dresser 30 will be described with reference to FIG.
支柱31上に固定した基台32にはカバー状の支持フレー
ム34が、該支持フレーム34をX,Y方向に移動させる可動
装置33を介して設けられており、支持フレーム34の端部
にチップドレッサ30が固定される。このチップドレッサ
30は、その突出端に電極チップ2a,2bを案内する上下の
ブレード案内孔35a,35bが設けられる。前記ブレード案
内孔35a,35b内には、チップドレッサ30の基端側に垂設
したモータ36により回転するブレードが内蔵されてい
る。さらに前記支持フレーム34の上面にはエアー吹出管
37が固定され、そのノズル口を上部のブレード案内孔35
aに向けている。エアー吹出管37は、ブレード案内孔35a
に溜った研磨屑を吹飛ばして清掃する役割を有する。A support frame 34 in the form of a cover is provided on a base 32 fixed on the column 31 via a movable device 33 for moving the support frame 34 in the X and Y directions. The dresser 30 is fixed. This tip dresser
30 has upper and lower blade guide holes 35a, 35b for guiding the electrode tips 2a, 2b at its protruding ends. In the blade guide holes 35a and 35b, a blade which is rotated by a motor 36 vertically provided on a base end side of the tip dresser 30 is incorporated. Further, an air outlet pipe is provided on the upper surface of the support frame 34.
37 is fixed and its nozzle port is connected to the upper blade guide hole 35.
pointing to a. The air outlet pipe 37 is connected to the blade guide hole 35a.
It has a role to blow off and remove the polishing debris accumulated on the surface.
そして、上述の判別装置20による『Ｌ』判定によっ
て、電極チップ2a,2bがブレード案内孔35a,35bに案内さ
れ、モータ36の駆動によりその端部が研削されて整形さ
れる。このとき電極チップ2a,2bを固定として、チップ
ドレッサ30を電極チップ2a,2b間に移動するようにして
も良い。Then, the electrode tip 2a, 2b is guided to the blade guide holes 35a, 35b by the "L" determination by the determination device 20, and the end is ground and shaped by the driving of the motor 36. At this time, the electrode tips 2a and 2b may be fixed, and the tip dresser 30 may be moved between the electrode tips 2a and 2b.
上述の電極チップ2a,2bの状態検知は、チップドレッ
サ30の研削加工後においても行ない、その加工結果を点
検するようにしても良い。この場合に、加工後において
も測定値表示部25に表われる値が低閾値l2以下であれ
ば、再度チップドレッサ30に掛けるか、チップドレッサ
30の点検等を行なう。The above-described state detection of the electrode tips 2a and 2b may be performed even after the grinding of the tip dresser 30, and the processing result may be checked. In this case, whether appearing value to the measured value display unit 25 even after processing if the low threshold l 2 or less, subjected to tip dresser 30 again, tip dresser
Perform inspection of 30, etc.
尚、溶接用ロボットを用いない抵抗溶接機にあって
は、前記チップドレッサ30により上述の発光ダイオード
からなる出力表示部25等を備えた出力表示装置を駆動し
てその表示により電極チップ2a,2bの状態を確認するよ
うにし、電極チップ2a,2bの整形またはチップドレッサ3
0を用いない溶接器の場合にあってはその交換を行な
う。In a resistance welding machine that does not use a welding robot, the tip dresser 30 drives an output display device including an output display unit 25 including a light-emitting diode as described above, and displays the electrode chips 2a and 2b based on the display. Of the electrode tips 2a, 2b or the tip dresser 3
If the welder does not use 0, replace it.
［発明の効果］ 本発明は、上述のように投光素子ｘを電極チップの端
部に照射して、その反射光を受光素子ｙで捕捉し、その
反射波強度により前記電極チップの状態を判定したもの
であり、このためチップドレッサを用いて電極チップの
整形を行なう場合には、最適タイミングで該チップドレ
ッサによる研削を行なうことができ、電極チップの過剰
な整形処理によって耐用寿命を低下させたり、または電
極チップが損耗しているにもかかわらず、放置してその
溶接品質を低下させることはない。またチップドレッサ
の研削能力の低下によって適正な状態に復元され得ない
場合も、該研削加工後に上記の反射波強度の点検を行な
うことによりかかる事態の改善を容易に行なうことがで
き、溶接品質を保全し得る。[Effect of the Invention] As described above, the present invention irradiates the light projecting element x to the end of the electrode chip, captures the reflected light by the light receiving element y, and changes the state of the electrode chip by the reflected wave intensity. Therefore, when shaping the electrode tip using a tip dresser, grinding with the tip dresser can be performed at the optimal timing, and the service life is reduced due to excessive shaping of the electrode tip. In spite of the fact that the electrode tip is worn or worn, the welding quality is not reduced by leaving it alone. In addition, even if the state cannot be restored to an appropriate state due to a decrease in the grinding ability of the tip dresser, such a situation can be easily improved by checking the reflected wave intensity after the grinding processing, and the welding quality can be reduced. Can be preserved.
さらに、チップドレッサを用いない場合にも、電極チ
ップの状態把握を熟練を要せず、正確に行なえるのでそ
の保守管理が容易となる、等の優れた効果がある。In addition, even when a tip dresser is not used, there is an excellent effect that the maintenance of the electrode tip can be easily performed because the skill of grasping the state of the electrode tip is not required and skill is required.
添付図面は本発明の一実施例を示し、第１図は本発明の
概要側面図、第２図は投光装置３と受光装置４の回路
図、第３図はチップドレッサ30を示す側面図である。 １……スポット溶接機 2a,2b……電極チップ ３……投光装置 ４……受光装置 20……判別装置 30……チップドレッサ ｘ……投光素子 ｙ……受光素子1 is a schematic side view of the present invention, FIG. 2 is a circuit diagram of a light projecting device 3 and a light receiving device 4, and FIG. 3 is a side view showing a chip dresser 30. It is. DESCRIPTION OF SYMBOLS 1 ... Spot welding machine 2a, 2b ... Electrode tip 3 ... Light emitting device 4 ... Light receiving device 20 ... Discriminating device 30 ... Chip dresser x ... Light emitting device y ... Light receiving device
Claims (1)
を印加する電極チップの先端に光を照射する投光素子
と、その反射波を捕捉する受光素子とを備え、さらに前
記受光素子により捕捉された光の反射波強度を所定閾値
と比較して電極チップの損耗度を判定し、判定信号を発
生する信号判別装置を備えてなる電極チップの損耗度検
知装置。A light-emitting element mounted on a resistance welding machine for applying a current to a workpiece to irradiate a tip of an electrode tip with light; and a light-receiving element for capturing a reflected wave of the light-emitting element. An electrode chip wear degree detecting device, comprising: a signal discriminating device that judges a degree of wear of the electrode chip by comparing a reflected wave intensity of light captured by the above with a predetermined threshold value and generates a determination signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10084390A JP2873604B2 (en) | 1990-04-16 | 1990-04-16 | Electrode tip wear level detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10084390A JP2873604B2 (en) | 1990-04-16 | 1990-04-16 | Electrode tip wear level detector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03297584A JPH03297584A (en) | 1991-12-27 |
| JP2873604B2 true JP2873604B2 (en) | 1999-03-24 |
Family
ID=14284603
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10084390A Expired - Lifetime JP2873604B2 (en) | 1990-04-16 | 1990-04-16 | Electrode tip wear level detector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2873604B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101859091B1 (en) * | 2011-02-22 | 2018-05-17 | 가부시키가이샤 교쿠토 | Apparatus of determining normal/defective condition of electrode chip |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07308786A (en) * | 1994-05-19 | 1995-11-28 | Hinomoto Kogyo Kk | Chip dress sensor |
| KR20030097100A (en) * | 2002-06-19 | 2003-12-31 | 현대자동차주식회사 | A wear measuring device of welding tip and control method thereof |
| EP1964639A1 (en) * | 2007-02-28 | 2008-09-03 | Abb Research Ltd. | Method of and system for controlling tools comprising spot welding electrodes using image obtaining and comparison means |
| US8847100B2 (en) * | 2008-01-08 | 2014-09-30 | Fanuc America Corporation | Weld cap and tip inspection method and apparatus |
| US10618129B2 (en) * | 2013-09-13 | 2020-04-14 | Sinterleghe S.R.L. | Automated adaptive maintenance method and system for welding gun electrodes |
-
1990
- 1990-04-16 JP JP10084390A patent/JP2873604B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101859091B1 (en) * | 2011-02-22 | 2018-05-17 | 가부시키가이샤 교쿠토 | Apparatus of determining normal/defective condition of electrode chip |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03297584A (en) | 1991-12-27 |
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