JPH03161186A - Method for supervising laser beam output in laser beam welding machine - Google Patents
Method for supervising laser beam output in laser beam welding machineInfo
- Publication number
- JPH03161186A JPH03161186A JP1296988A JP29698889A JPH03161186A JP H03161186 A JPH03161186 A JP H03161186A JP 1296988 A JP1296988 A JP 1296988A JP 29698889 A JP29698889 A JP 29698889A JP H03161186 A JPH03161186 A JP H03161186A
- Authority
- JP
- Japan
- Prior art keywords
- laser beam
- beam output
- laser
- temp
- laser output
- 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.)
- Pending
Links
- 238000003466 welding Methods 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims abstract description 14
- 230000003287 optical effect Effects 0.000 claims abstract description 14
- 239000012809 cooling fluid Substances 0.000 claims abstract description 5
- 238000012544 monitoring process Methods 0.000 claims description 11
- 239000000498 cooling water Substances 0.000 abstract description 9
- 238000001816 cooling Methods 0.000 abstract description 5
- 230000006866 deterioration Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 5
- 238000009529 body temperature measurement Methods 0.000 description 2
- 235000013399 edible fruits Nutrition 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000010355 oscillation Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000035922 thirst Effects 0.000 description 1
Landscapes
- Laser Beam Processing (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明はレーザ溶接機のレーザ出力監視方法に係り、詳
しくは、レーザ光の溶接点直近の光学要素を冷却する冷
却流体、例えば、東光レンズ又は東光ミラーの冷郎水の
入側ならびに出側の温度を測定し、この温度差とレーザ
出力との相関特性からレーザ出力の上限値ならびに下限
値を設定し、この設定値によりレーザ出力の制限若しく
は警報発生等を監視するレーザ溶接機のレーザ出力監視
方法に係る。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method for monitoring laser output of a laser welding machine, and more particularly, a cooling fluid for cooling an optical element in the vicinity of a welding point of a laser beam, such as a Toko lens or a Toko The temperature of the cold water inlet and outlet of the mirror is measured, and the upper and lower limits of the laser output are set based on the correlation between this temperature difference and the laser output, and these set values are used to limit or alarm the laser output. The present invention relates to a method for monitoring laser output of a laser welding machine to monitor occurrences, etc.
従 来 の 技 術
例えば、銅帯等の突き合わせ溶接にレーｆ溶接法が用い
られているが、このレーザ溶接装冒の気体レーザ発１！
器において、放電部の状態の監視および放電部のｉｌＪ
ｔｌｉｌは安定なレーザ発振出力を得るために重要であ
る。従来、放電状態の監視は管電圧、管電流の個別監視
、またはアークセンサ等による異常放電監視が行なわれ
ているにすぎない。Conventional technologyFor example, the laser f welding method is used for butt welding of copper strips, etc., but this laser welding equipment uses gas laser radiation1!
In the device, monitoring of the state of the discharge section and ilJ of the discharge section
tlil is important for obtaining stable laser oscillation output. Conventionally, the discharge state has been monitored only by individual monitoring of tube voltage and tube current, or abnormal discharge monitoring using an arc sensor or the like.
レーザ発振器のみの出力監視方法としては、さきに、気
体レーザ発振器の放電部への投入電流、電圧および発振
出力のうち２項目以上の相関特性を測定し、この相関特
性から得られたパラメータの値により警報発生および放
電制御を行なう方法を提案した。To monitor the output of only the laser oscillator, first measure the correlation characteristics of two or more of the current injected into the discharge section of the gas laser oscillator, the voltage, and the oscillation output, and then measure the parameter values obtained from the correlation characteristics. We proposed a method for alarm generation and discharge control.
しかしながら、実際にはレーザ溶接点におけるレーザ出
力が問題であり、この溶接点直近におけるレーザ出力の
監視方沫の出現が望まれてい春゛。However, in reality, the problem is the laser output at the laser welding point, and a method for monitoring the laser output in the vicinity of the welding point is desired.
発明が解決しようとする課題
本発明は上記問題の解決を目的とし、具体的には、レー
ザ光を集光させる光学要素を冷却している冷却水の温度
上昇とレーザ出力との相関性を利用し、レーザの出力を
監視するレーザ溶接機のレーザ出力監視方法を提案する
ことを目的とする。Problems to be Solved by the Invention The present invention aims to solve the above problems, and specifically, utilizes the correlation between the temperature rise of the cooling water that cools the optical element that condenses the laser beam and the laser output. The purpose of this paper is to propose a method for monitoring the laser output of a laser welding machine.
課題を解決するための
手段ならびにその作用
すなわら、本発明は、レーザ光の溶接点直近の光学要素
を冷却するＷ１Ｎ］５ｉ！体の入側温度と出側温度とを
それぞれ測定し、この温度差を予め設定したレーザ出力
条件に導入して演算し、レーザ出力の制限若しくは警報
発生の監ｍ ｓ＋ ｍを行なうことをｖ１ｍとする。Means for solving the problem and its operation, the present invention cools the optical element in the vicinity of the welding point of the laser beam W1N]5i! v1m refers to measuring the entrance and exit temperatures of the body, and calculating the temperature difference by introducing it into preset laser output conditions to limit the laser output or monitor the generation of alarms. do.
以下、本発明の手段たる構戊ならびにその作用について
図面により説明すると、次の通りである。Hereinafter, the structure of the present invention and its operation will be explained with reference to the drawings.
なお、第１図は本発明を実施する際に用いられる一例の
装置の説明図であり、Ｗ４２図はレ−ザ光の集光を凸レ
ンズで１１なう場合の説明図であり、第３図は冷却水の
入側ならびに出側の温度差とレーザ出力との関係を示す
グラフである。In addition, FIG. 1 is an explanatory diagram of an example of a device used in carrying out the present invention, FIG. is a graph showing the relationship between the temperature difference between the inlet and outlet sides of cooling water and the laser output.
ます、第１図の装置はミラー東光方式のものを示し、レ
ーザ溶接Ｓｉｌ！１と栗光ミラー冷却水の温度測定ａ置
２と制御用演算装置３とから構戒ざれている。The device shown in Figure 1 is of the mirror Toko type, and is a laser welding device using Sil! 1, the temperature measurement device 2 of the Kuriko mirror cooling water, and the control arithmetic unit 3.
このレーザ溶接菰置１は集光ミラーにレーザ光をあてる
ヘンダーミラ−４と東光ミラー５と東光ミラー冷却部６
とから構或され、レーザ光が集光ミラー５にヘンダーミ
ラ−４を介して導入され、溶接点で溶接されるようにな
っている。This laser welding equipment 1 includes a Hender mirror 4 that applies laser light to a condensing mirror, a Toko mirror 5, and a Toko mirror cooling unit 6.
A laser beam is introduced into a condensing mirror 5 via a hender mirror 4, and welding is performed at a welding point.
一方、レーザ溶接点直近ではレンズ、ミラともに冷却水
７を使用しており、この冷却水の入側温度１，と出側渇
度ｔ２に温度差Δｔがあること、また、この冷Ｗ本の温
ｒ！Ｌ差Δｔとレーザ出力Ｐとの間にｉ２図に示すよう
にΔｔが大きいとＰは大となり、また、Δ【が小であれ
ばＰは小となるという関係を有することから、冷却水の
入側湛度１．と出側温度【２をそれぞれ温度測定装置３
で厠定し、この温度差Δ【を演ｗＩ装置に予め設定した
出力条件に導入して＊ｌｌし、レーザ出力の上限値およ
び下限値を定め、レーザ出力をｉｌＪＩｆｌすると、溶
接点直近でのレーザ出力モニタ（監視）、すなわら、レ
ーザの出力の制限や警報の発生等の監視を行なうことが
できる。従って、本発明によれは光学系例えば放電部の
劣化状況を評価することが可能となり、劣化状況に応じ
て光学系の特性を発揮するように制御することができる
。On the other hand, in the vicinity of the laser welding point, cooling water 7 is used for both the lens and the mirror, and there is a temperature difference Δt between the inlet temperature 1 and outlet thirst t2 of this cooling water. Warm r! There is a relationship between the L difference Δt and the laser output P, as shown in the i2 diagram, when Δt is large, P is large, and when Δ[ is small, P is small. Entry side fullness 1. and outlet temperature [2] respectively with temperature measuring device 3
This temperature difference Δ[ is introduced into the output conditions set in advance in the welding device *ll, the upper and lower limits of the laser output are determined, and the laser output is ilJIfl. Laser output monitor (monitoring), that is, limitation of laser output, generation of alarm, etc. can be performed. Therefore, according to the present invention, it is possible to evaluate the state of deterioration of the optical system, for example, the discharge section, and it is possible to control the optical system to exhibit its characteristics in accordance with the state of deterioration.
以上、ミラー泉光方式によるレーザ溶ｉｕｉの例で本発
明を説明したが、本発明はこれに限られるものでない。Although the present invention has been described above using an example of laser melting IUI using a mirror spring light method, the present invention is not limited to this.
なお、集光ミラーが凹面鏡の場合は第２図に示す凸レン
ズに比べ、冷却が容易であり、熱変形による焦点の・Ｓ
％らつきが大きいという差異があるが、いずれも同様に
用いることができ、その効果もほぼ同様である。Note that if the condensing mirror is a concave mirror, it is easier to cool it than the convex lens shown in Figure 2, and the focal point due to thermal deformation can be
Although there is a difference in that the percentage fluctuation is large, both can be used in the same way, and the effects are almost the same.
実施例
厚さ０．４〜６．０閣、幅６００〜１６００−の鋼帯を
連続処理するラインにおいて、その接続部をレーザ出力
５〜１０ＫＬ溶接速度２．０〜３，０１１／分で溶接を
行なうレーザ溶接装置に本発明を適用した。Example: In a line that continuously processes steel strips with a thickness of 0.4 to 6.0 mm and a width of 600 to 1,600 mm, the joints are welded at a laser output of 5 to 10 KL and a welding speed of 2.0 to 3,011/min. The present invention was applied to a laser welding device that performs.
なお、溶接は第１図に示す装置を用い、集光ミラー冷却
部の′ＩｆＩ即水の入側ならびに出側の温度を湛ｒ！Ｉ
．Ｒ定装置により測定し、その温度差を予め制御用演ｖ
４装置に設定したレーザ出力条件に導入し、制御用演譚
を行ない、レーザ出力の上限値ならびに下限値を定め、
レーザ出力を制御し、その出力制限若しくは警報発生等
の監視を行なった。For welding, use the equipment shown in Figure 1, and check the temperature at the inlet and outlet sides of the IfI instant water of the condensing mirror cooling section. I
．． The temperature difference is measured by a temperature control device, and the temperature difference is calculated in advance for control purposes.
4.Introduce the laser output conditions set in the device, perform a control speech, determine the upper and lower limits of the laser output,
The laser output was controlled, and output limitations and alarm generation were monitored.
本発明によれば、レーザ発信部の出力変化にとどまらず
、楽光ミラーを含む光学系自体の劣化をも継続して監視
でき、また、レーザ出力の下限値を決めることにより劣
化の予測管理が可能となった。According to the present invention, it is possible to continuously monitor not only changes in the output of the laser transmitter, but also deterioration of the optical system itself including the Rakuko mirror, and predictive management of deterioration is possible by determining the lower limit of the laser output. It has become possible.
一方、本発明法を用いない従来法では光学系の劣化度監
視は溶接結果から推定する程度で正確な監視は困難であ
った。On the other hand, in the conventional method that does not use the method of the present invention, the degree of deterioration of the optical system can be monitored only by estimating it from the welding results, and accurate monitoring is difficult.
く発明の効果〉
以上詳しく説明したように、本発明法は、レ一ザ光の溶
接点直近の光学要素を′Ｉｒ！却する冷却流体の入側温
度と出側温度とをそれぞれ測定し、この温度差を予め設
定したレーザ出力条件に導入して演算し、レーザ出力の
制限若しくは警報発生の監視ＩｌｌＩＩＩｌを行なうこ
とを！Ｖ徴とする。Effects of the Invention> As explained in detail above, the method of the present invention allows the optical element in the vicinity of the welding point of the laser beam to be Measure the inlet and outlet temperatures of the cooling fluid to be cooled, and calculate the temperature difference by introducing it into preset laser output conditions to limit the laser output or monitor the occurrence of an alarm! It is assumed to be a V sign.
従って、本発明法によれば光学要素の冷却流体の温度差
を利用して溶接点直近でのレーザ出力の監視をするよう
にしたため、光学系の評価１１棉が適正化され、なかで
も、集光ミラー自体の劣化監視ならびに発振器からトー
チ間の全光学系の劣化をＭ続して監視することが可能と
なった。Therefore, according to the method of the present invention, the laser output in the vicinity of the welding point is monitored using the temperature difference of the cooling fluid of the optical element, so the evaluation of the optical system is made more appropriate. It has become possible to continuously monitor the deterioration of the optical mirror itself as well as the deterioration of the entire optical system between the oscillator and the torch.
第１図は本発明を実施する際に用いられる一例の装置の
説明図、第２図はレーザ光の巣光を凸レンズで行なう場
合の説明図、第３図は冷却水の入側ならびに出側の温度
差とレーザ出力との関係を示すグラフである。
符号１・・・・・・レーザ溶接装置
２・・・・・・温度測定Ｂｉｌ！
３・・・・・・演算装置
４・・・・・・ヘンダーミラ
５・・・・・・果光ミラー
６・・・・・・果光ミラー冷却部
ｌ・・・・・・冷却水
８・・・・・・東光レンズFig. 1 is an explanatory diagram of an example of a device used in carrying out the present invention, Fig. 2 is an explanatory diagram of a case where a convex lens is used to form a beam of laser light, and Fig. 3 is an explanatory diagram of the cooling water inlet and outlet sides. 2 is a graph showing the relationship between temperature difference and laser output. Code 1...Laser welding device 2...Temperature measurement Bil! 3... Arithmetic device 4... Hender mirror 5... Fruit light mirror 6... Fruit light mirror cooling section l... Cooling water 8. ...Toko lens
Claims (1)
体の入側温度と出側温度とをそれぞれ測定し、この温度
差を予め設定したレーザ出力条件に導入して演算し、レ
ーザ出力の制限若しくは警報発生の監視制御を行なうこ
とを特徴とするレーザ溶接機のレーザ出力監視方法。1) Measure the inlet and outlet temperatures of the cooling fluid that cools the optical element in the vicinity of the welding point of the laser beam, and calculate this temperature difference by introducing it into the preset laser output conditions to determine the laser output. 1. A method for monitoring laser output of a laser welding machine, characterized by carrying out monitoring control of restriction or alarm generation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1296988A JPH03161186A (en) | 1989-11-15 | 1989-11-15 | Method for supervising laser beam output in laser beam welding machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1296988A JPH03161186A (en) | 1989-11-15 | 1989-11-15 | Method for supervising laser beam output in laser beam welding machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03161186A true JPH03161186A (en) | 1991-07-11 |
Family
ID=17840800
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1296988A Pending JPH03161186A (en) | 1989-11-15 | 1989-11-15 | Method for supervising laser beam output in laser beam welding machine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03161186A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003517616A (en) * | 1999-12-15 | 2003-05-27 | ペルマノヴァ・レーザーシステム・エービー | Method and apparatus for measuring optical power loss in fiber optic contact means |
-
1989
- 1989-11-15 JP JP1296988A patent/JPH03161186A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003517616A (en) * | 1999-12-15 | 2003-05-27 | ペルマノヴァ・レーザーシステム・エービー | Method and apparatus for measuring optical power loss in fiber optic contact means |
| JP4975927B2 (en) * | 1999-12-15 | 2012-07-11 | オプトスカンド エービー | Method and apparatus for measuring optical power loss in fiber optic contact means |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5506386A (en) | Simultaneous temperature measurements on laser welded seams with at least two pyrometers in relation to monitoring process parameters and weld quality | |
| EP0883046A1 (en) | Prediction of chiller compressor motor overheating | |
| KR20040058204A (en) | Pulse oscillation solid-state laser apparatus and laser machining apparatus | |
| JPH1177264A (en) | Method and device for detecting molten metal leakage at early time at the time of continuously casting steel material by using oscillating mold | |
| JPH03161186A (en) | Method for supervising laser beam output in laser beam welding machine | |
| JP2019174143A (en) | Thermal flow sensor device and flow rate correction method | |
| JPH04160327A (en) | Electronic clinical thermometer | |
| JPH1047312A (en) | Hydraulic cylinder internal leakage-detecting method | |
| JP2664417B2 (en) | NC laser device | |
| CN112958751A (en) | Online prediction and management method for continuous casting secondary cooling state | |
| JP4138924B2 (en) | Refrigerator operating condition detection method | |
| JP4548777B2 (en) | Method for predicting remaining amount of refractory and method for operating ash melting furnace using the same | |
| US5005177A (en) | Laser optics quality monitoring | |
| JP2902946B2 (en) | Abnormality determination device for absorption type water heater | |
| JPH03152441A (en) | Testing method for thermal fatigue | |
| JPH10277716A (en) | Method for measuring thickness of solidified shell in continuous casing and instrument therefor | |
| JPH02241071A (en) | Nc laser equipment | |
| JPH05273043A (en) | Radiation temperature measuring apparatus, emissivity measuring apparatus and decision method of emissivity cumulative ratio-emissivity correlation | |
| JP2002090224A (en) | Thermometer anomaly detecting method and device | |
| JPS63246637A (en) | Apparatus for monitoring erosion of turbine blade | |
| JPH0310128A (en) | Method for simultaneously measuring temperature and emissivity in high temperature furnace | |
| JPS6054256A (en) | Method for diagnosing abnormality of continuous casting machine | |
| JPH03273136A (en) | Method and device for corrosion control | |
| JPS60190124A (en) | Method of preventing excess of contacted power amount | |
| JPS6330162A (en) | Measurement for shell thickness in continuous casting |