SE512097C2 - Method and apparatus for monitoring the status of a protective glass in laser machining - Google Patents
Method and apparatus for monitoring the status of a protective glass in laser machiningInfo
- Publication number
- SE512097C2 SE512097C2 SE9801780A SE9801780A SE512097C2 SE 512097 C2 SE512097 C2 SE 512097C2 SE 9801780 A SE9801780 A SE 9801780A SE 9801780 A SE9801780 A SE 9801780A SE 512097 C2 SE512097 C2 SE 512097C2
- Authority
- SE
- Sweden
- Prior art keywords
- protective glass
- holder
- detector
- glass plate
- laser
- Prior art date
Links
- 239000011521 glass Substances 0.000 title claims abstract description 55
- 230000001681 protective effect Effects 0.000 title claims abstract description 52
- 238000000034 method Methods 0.000 title claims abstract description 11
- 238000003754 machining Methods 0.000 title abstract description 6
- 238000012544 monitoring process Methods 0.000 title description 3
- 230000005855 radiation Effects 0.000 claims abstract description 17
- 230000003287 optical effect Effects 0.000 claims abstract description 11
- 239000002245 particle Substances 0.000 abstract description 19
- 239000000779 smoke Substances 0.000 abstract description 8
- 238000010521 absorption reaction Methods 0.000 abstract description 3
- 238000011109 contamination Methods 0.000 abstract 1
- 239000000428 dust Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 238000000149 argon plasma sintering Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000011368 organic material Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/70—Auxiliary operations or equipment
- B23K26/702—Auxiliary equipment
- B23K26/707—Auxiliary equipment for monitoring laser beam transmission optics
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/70—Auxiliary operations or equipment
- B23K26/702—Auxiliary equipment
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Laser Beam Processing (AREA)
- Lasers (AREA)
Abstract
Description
35 512 097. _'2._ ras med laserstrålen. Blir då strålningen mer diffus på grund av spridningen leder detta till att den goda skärpan i de graverade mönstren eller texterna ej kan upprätthål- las. 35 512 097. _'2._ race with the laser beam. If the radiation then becomes more diffuse due to the scattering, this leads to the good sharpness in the engraved patterns or texts not being maintained.
Det finns dessutom en risk att skyddsglaset spricker om det blir alltför smutsigt. Av dessa skäl måste därför skyddsglasen bytas ut med jämna mellanrum.There is also a risk that the protective glass will crack if it becomes too dirty. For these reasons, the protective glasses must therefore be replaced at regular intervals.
Vid automatiserad produktion är det förut känt att kon- trollera status hos skyddsglaset löpande under arbetets gång och utan att bearbetningsprocessen behöver avbrytas.In the case of automated production, it is previously known to check the status of the protective glass continuously during the work and without the processing process having to be interrupted.
I DE 196 05 018 Al visas således en metod för att mäta spridd strålning från partiklar som fastnat på skyddsgla- set. En liknande metod beskrivs i SE 97.00196-0. I båda fallen är en detektor placerad i anslutning till skydds- glasets kant och känner av den strålning som spritts till kanten hos skyddsglaset på grund av smutspartiklarna.DE 196 05 018 A1 thus shows a method for measuring scattered radiation from particles stuck on the protective glass. A similar method is described in SE 97.00196-0. In both cases, a detector is located adjacent to the edge of the protective glass and senses the radiation that is scattered to the edge of the protective glass due to the dirt particles.
Vid laserbearbetning visar det sig emellertid att proble- met med nedsmutsning av skyddsglaset är av två helt skilda slag. Dels är det större partiklar, som lägger sig på ytan, dels är det små rökpartiklar som orsakas av förång- ning av organiskt material och lätt förångade metaller.In laser processing, however, it turns out that the problem of soiling the protective glass is of two completely different kinds. On the one hand, it is larger particles that settle on the surface, and on the other hand, it is small smoke particles that are caused by the evaporation of organic material and slightly evaporated metals.
.De förstnämnda, större partiklarna ger upphov till en stark ljusspridning och kan enkelt detekteras med hjälp av de ovanstående metoderna. De små rökpartiklarna ger dock inte upphov till någon mätbar spridning av strålningen, men desto mer absorption av lasereffekten vilket orsakar en alltför hög temperatur hos skyddsglaset och de mekanis- ka detaljer som håller fast glaset. Båda nedsmutsningsty- perna kan leda till försämrad svetskvalitet och skydds- glasbrott och ett därmed sammanhängande optikhaveri.The former, larger particles give rise to a strong light scattering and can be easily detected using the above methods. However, the small smoke particles do not give rise to any measurable scattering of the radiation, but all the more absorption of the laser effect, which causes an excessive temperature of the protective glass and the mechanical details that hold the glass. Both types of soiling can lead to reduced welding quality and protective glass breakage and a related optical failure.
Det finns därför ett behov av en förbättrad skyddsglasö- vervakning där skyddsglasets status kontrolleras löpande även med avseende på små rökpartiklar. 10 15 20 25 30 35 _'3_ Enligt uppfinningen åstadkommes detta medelst en termisk detektor som är så anordnad att den känner av (mäter) tem- peraturen hos skyddsglaset eller dess hållare, företrädes- vis hos den mekaniska detalj som fixerar skyddsglaset.There is therefore a need for improved protective glass monitoring where the status of the protective glass is continuously monitored even with regard to small smoke particles. According to the invention, this is achieved by means of a thermal detector which is arranged so that it senses (measures) the temperature of the protective glass or its holder, preferably of the mechanical part which fixes the protective glass.
Enligt en fördelaktig utföringsform kombineras den termis- ka detektorn med en optisk detektor av det tidigare kända slaget, så att båda nedsmutsningstyperna kan kontrolleras samtidigt.According to an advantageous embodiment, the thermal detector is combined with an optical detector of the previously known type, so that both types of soiling can be checked simultaneously.
I det följande skall uppfinningen närmare åskådliggöras under hänvisning till bifogade ritningsfigurer som visar ett exempel på hur detektorerna kan vara anordnade i an- slutning till ett skyddsglas.In the following, the invention will be further illustrated with reference to the accompanying drawing figures which show an example of how the detectors can be arranged in connection with a protective glass.
Figur 1 visar ett känt arrangemang med optisk skyddsglasö- vervakning vid laserbearbetning, Figur 2 visar schematiskt ett arrangemang enligt uppfin- ningen, Figur 3 visar ett s.k. sensorkort med både en optisk och en termisk detektor, och Figur 4 visar i detalj sensorkortet monterat i anslutning till skyddsglasets kant.Figure 1 shows a known arrangement with optical protective glass monitoring during laser processing, Figure 2 schematically shows an arrangement according to the invention, Figure 3 shows a so-called sensor card with both an optical and a thermal detector, and Figure 4 shows in detail the sensor card mounted adjacent to the edge of the protective glass.
I figur 1 visas schematiskt en fokuseringsoptik, som sym- boliserats med linsen 1, vilken koncentrerar den infallan- de laserstrålningen på ett arbetsstycke 2. Det kan vara fråga om svetsning, gravering av det slag som visas i SE 94 03349-5, skärning eller någon annan form av laserbear- betning. Gemensamt för sådana bearbetningar är att det produceras smuts och dammpartiklar, "sprut" från bearbet- ningsprocessen, runt den detalj som bearbetas. För att in- te dessa partiklar skall tränga in i fokuseringsoptiken är ett skyddsglas 3 anbringat mellan arbetsstycket 2 och fo- kuseringslinsen 1. Skyddsglaset är monterat i en hållare 4 512 097 10 15 20 25 30 35 512 097 _'4 _ och har en cirkulär kantperiferi.Figure 1 schematically shows a focusing optics, symbolized by the lens 1, which concentrates the incident laser radiation on a workpiece 2. This may be welding, engraving of the kind shown in SE 94 03349-5, cutting or any other form of laser processing. Common to such machining is that dirt and dust particles, "splashes" from the machining process, are produced around the part being machined. In order not to penetrate these particles into the focusing optics, a protective glass 3 is fitted between the workpiece 2 and the focusing lens 1. The protective glass is mounted in a holder 4 512 097 10 15 20 25 30 35 512 097 _'4 _ and has a circular edge periphery.
De smuts-, damm- och rökpartiklar 5 som bildas vid bear- betningsprocessen kommer istället att lägga sig på skydds- glaset 3. Därmed förhindras dessa partiklar att tränga in i det mer vitala optiska systemet, men nackdelen är att partiklarna lägger sig på glaset och kommer att sprida och absorbera en del av den infallande laserstrålningen 6. En fotodetektor 8 är därför anordnad vid kanten hos skydds- glaset och känner av den spridda strålning 7 som uppträder på kanten 9 och vilken är ett mått på smutsbeläggningen på skyddsglaset. Fotodetektorn mäter hur mycket strålning som spritts av partiklar på skyddsglasets yta. Då detektorsig- nalen uppgår till en viss nivå kan den indikera att det är dags att byta skyddsglas. Således kan status på skyddsgla- set med avseende på sådana partiklar som ger upphov till spridd strålning kontrolleras löpande under arbetes gång.The dirt, dust and smoke particles 5 formed during the processing process will instead settle on the protective glass 3. This prevents these particles from penetrating into the more vital optical system, but the disadvantage is that the particles settle on the glass and will scatter and absorb a part of the incident laser radiation 6. A photodetector 8 is therefore arranged at the edge of the protective glass and senses the scattered radiation 7 which appears on the edge 9 and which is a measure of the dirt coating on the protective glass. The photodetector measures how much radiation is scattered by particles on the surface of the protective glass. When the detector signal amounts to a certain level, it may indicate that it is time to change the protective glass. Thus, the status of the protective glass with respect to such particles that give rise to scattered radiation can be checked continuously during work.
Som nämndes inledningsvis ger laserbearbetningen emeller- tid även upphov till små rökpartiklar som inte orsakar nå- gon sådan spridd strålning. Dessa rökpartiklar orsakar istället en absorption av lasereffekten, vilket kan vara väl så skadligt eftersom det ger upphov till en alltför hög temperatur hos skyddsglaset och omgivande mekaniska detaljer, speciellt naturligtvis sådana detaljer som står i termisk kontakt med skyddsglaset.As mentioned at the outset, however, the laser processing also gives rise to small smoke particles which do not cause any such scattered radiation. These smoke particles instead cause an absorption of the laser effect, which can be just as harmful as it gives rise to an excessive temperature of the protective glass and surrounding mechanical details, especially of course such details that are in thermal contact with the protective glass.
Enligt uppfinningen är därför också en termisk detektor 10 anordnad i anslutning till skyddsglaset för att mäta tem- peraturen hos skyddsglaset och omgivande mekaniska detal- jer. Då detektorsignalen uppgår till en viss nivå kan den indikera att det är dags att byta skyddsglas. Själva de- tektorn l0 kan vara av i och för sig känt slag och be- skrivs därför ej närmare här.According to the invention, therefore, a thermal detector 10 is also provided in connection with the protective glass for measuring the temperature of the protective glass and surrounding mechanical parts. When the detector signal reaches a certain level, it may indicate that it is time to change the protective glass. The detector l0 itself may be of a type known per se and is therefore not described in more detail here.
Den termiska detektorn 10 monteras tillsammans med den op- tiska detektorn 8 på ett s.k. sensorkort ll, se figur 3.The thermal detector 10 is mounted together with the optical detector 8 on a so-called sensor card ll, see figure 3.
Sensorkortet ll är monterat direkt mot den mekaniska de- 10 15 20 25 30 35 _ 5 _ talj som fixerar skyddsglaset i hållaren 4. Därmed erhål- les en god termisk kontakt med hållaren 4, se figur 4. Den optiska detektorn 8 är monterad överst på kortet så att den "ser" kanten på skyddsglaset 3 genom ett optiskt fön- ster 13, dvs analogt med vad som beskrivs i SE 97.00196-0.The sensor board 11 is mounted directly against the mechanical part which fixes the protective glass in the holder 4. Thus a good thermal contact is obtained with the holder 4, see figure 4. The optical detector 8 is mounted at the top on the card so that it "sees" the edge of the protective glass 3 through an optical window 13, ie analogous to what is described in SE 97.00196-0.
Kortet är fastsatt med en skruv, bult 14 eller liknande på skyddsglasets hållare 4. Detektorerna är via ett kontakt- don 12 och en ledning 15 anslutna till en elektronikenhet som avger en elektrisk signal till indikeringsorgan (ej visade). Både elektronikenheten och indikeringsorganen kan vara av i och för sig känt slag och beskrivs därför ej närmare här. Då signalerna överstiger en viss, förutbe- stämd nivå indikeras detta exempelvis med en ljudsignal eller indikeras på en display.The card is fixed with a screw, bolt 14 or the like on the holder 4 of the protective glass. Both the electronics unit and the indicating means can be of a type known per se and are therefore not described in more detail here. When the signals exceed a certain, predetermined level, this is indicated, for example, by an audible signal or indicated on a display.
Uppfinningen är inte begränsad till de som exempel visade utföringsformerna utan kan varieras inom ramen för de ef- terföljande patentkraven. Uppfinningen kan dessutom kombi- neras med olika metoder för att undvika att smuts lägger sig på skyddsglaset, exempelvis crossjet, axialblås. '512 097The invention is not limited to the embodiments shown by way of example but can be varied within the scope of the following claims. The invention can also be combined with various methods to prevent dirt from settling on the protective glass, for example crossjet, axial bladder. '512 097
Claims (7)
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE9801780A SE512097C2 (en) | 1998-05-20 | 1998-05-20 | Method and apparatus for monitoring the status of a protective glass in laser machining |
| JP2000549415A JP2002515341A (en) | 1998-05-20 | 1999-04-13 | Method and apparatus for checking the condition of protective glass in connection with laser machining |
| EP99925508A EP1146986A1 (en) | 1998-05-20 | 1999-04-13 | A method and an apparatus for checking the condition of a protective glass in connection with laser machining |
| PCT/SE1999/000592 WO1999059762A1 (en) | 1998-05-20 | 1999-04-13 | A method and an apparatus for checking the condition of a protective glass in connection with laser machining |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE9801780A SE512097C2 (en) | 1998-05-20 | 1998-05-20 | Method and apparatus for monitoring the status of a protective glass in laser machining |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| SE9801780D0 SE9801780D0 (en) | 1998-05-20 |
| SE9801780L SE9801780L (en) | 1999-11-21 |
| SE512097C2 true SE512097C2 (en) | 2000-01-24 |
Family
ID=20411390
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| SE9801780A SE512097C2 (en) | 1998-05-20 | 1998-05-20 | Method and apparatus for monitoring the status of a protective glass in laser machining |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP1146986A1 (en) |
| JP (1) | JP2002515341A (en) |
| SE (1) | SE512097C2 (en) |
| WO (1) | WO1999059762A1 (en) |
Families Citing this family (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE20206255U1 (en) * | 2002-04-19 | 2003-08-28 | Thyssen Laser-Technik GmbH, 52074 Aachen | Carbon dioxide power laser with zinc selenide lens includes rapid response temperature sensor near lens to produce shutdown signal |
| EP1362662A1 (en) * | 2002-05-08 | 2003-11-19 | Lasag Ag | Laser welding head and laser welding apparatus |
| DE10310854B3 (en) * | 2003-03-11 | 2004-09-30 | Erlas Erlanger Lasertechnik Gmbh | Method, monitoring device and laser processing system with defect monitoring of an optical component |
| ATE332209T1 (en) * | 2003-06-20 | 2006-07-15 | Trumpf Laser Gmbh & Co Kg | METHOD AND LASER PROCESSING HEAD WITH A DEVICE FOR MONITORING AN OPTICAL ELEMENT OF A PROCESSING HEAD OF A MACHINE FOR THERMALLY PROCESSING A WORKPIECE |
| EP1643281A1 (en) | 2004-10-02 | 2006-04-05 | Trumpf Werkzeugmaschinen GmbH + Co. KG | Optical element of a laser processing machine and support for the optical element |
| US20090242526A1 (en) * | 2008-03-26 | 2009-10-01 | Electro Scientific Industries, Inc. | Laser micromachining through a protective member |
| EP3148016B1 (en) * | 2010-11-23 | 2018-02-28 | IPG Photonics Corporation | Laser process head |
| DE102014205907B4 (en) * | 2014-03-31 | 2020-03-26 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Protection device for protection against laser radiation |
| JP6097796B2 (en) * | 2015-07-09 | 2017-03-15 | アイピージー フォトニクス コーポレーション | Method and system for monitoring the output of a high power fiber laser system |
| CN105772961A (en) * | 2016-03-29 | 2016-07-20 | 同高先进制造科技(太仓)有限公司 | Laser head protection lens pollution monitoring device based on scattered light detection and working method thereof |
| CN105665951A (en) * | 2016-03-29 | 2016-06-15 | 同高先进制造科技(太仓)有限公司 | Laser head protection glasses monitoring device based on scattered light and temperature detection and working method |
| CN106927257B (en) * | 2017-03-29 | 2023-04-11 | 中国科学院西安光学精密机械研究所 | Automatic protective glass replacing device of laser fusion target field optical diagnosis equipment |
| JP7340733B2 (en) | 2017-09-21 | 2023-09-08 | パナソニックIpマネジメント株式会社 | Laser processing head and laser processing system using it |
| FR3085205B1 (en) * | 2018-08-22 | 2020-07-24 | Livbag Sas | LASER WELDER PROTECTIVE GLASS CONTROL DEVICE AND METHOD |
| KR102175421B1 (en) * | 2018-10-28 | 2020-11-06 | 네모엔지니어링 주식회사 | Laser processing apparatus and laser processing system |
| CN109759723A (en) * | 2019-03-05 | 2019-05-17 | 奔腾激光(温州)有限公司 | A kind of laser cutting head |
| JP7316500B2 (en) * | 2019-06-03 | 2023-07-28 | パナソニックIpマネジメント株式会社 | Laser processing head and laser processing apparatus having the same |
| CN115647621A (en) * | 2022-10-14 | 2023-01-31 | 深圳市创想三维科技股份有限公司 | Detection assembly, laser module, light emitting control method of laser module and laser processing equipment |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0716795B2 (en) * | 1988-01-19 | 1995-03-01 | ミヤチテクノス株式会社 | Laser emission port protection glass plate dirt detection device |
| JPH04118193A (en) * | 1990-09-04 | 1992-04-20 | Hitachi Constr Mach Co Ltd | Device for monitoring protective glass of laser beam machine |
| DE19605018A1 (en) * | 1996-01-31 | 1997-08-07 | Inpro Innovations Gmbh | Monitoring protective glass of laser welding optics |
-
1998
- 1998-05-20 SE SE9801780A patent/SE512097C2/en not_active IP Right Cessation
-
1999
- 1999-04-13 WO PCT/SE1999/000592 patent/WO1999059762A1/en not_active Ceased
- 1999-04-13 JP JP2000549415A patent/JP2002515341A/en active Pending
- 1999-04-13 EP EP99925508A patent/EP1146986A1/en not_active Withdrawn
Also Published As
| Publication number | Publication date |
|---|---|
| WO1999059762A1 (en) | 1999-11-25 |
| SE9801780D0 (en) | 1998-05-20 |
| JP2002515341A (en) | 2002-05-28 |
| SE9801780L (en) | 1999-11-21 |
| EP1146986A1 (en) | 2001-10-24 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| NUG | Patent has lapsed |