EP1146986A1 - A method and an apparatus for checking the condition of a protective glass in connection with laser machining - Google Patents
A method and an apparatus for checking the condition of a protective glass in connection with laser machiningInfo
- Publication number
- EP1146986A1 EP1146986A1 EP99925508A EP99925508A EP1146986A1 EP 1146986 A1 EP1146986 A1 EP 1146986A1 EP 99925508 A EP99925508 A EP 99925508A EP 99925508 A EP99925508 A EP 99925508A EP 1146986 A1 EP1146986 A1 EP 1146986A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- protective glass
- holder
- laser
- detector
- glass plate
- 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.)
- Withdrawn
Links
- 239000011521 glass Substances 0.000 title claims abstract description 70
- 230000001681 protective effect Effects 0.000 title claims abstract description 59
- 238000003754 machining Methods 0.000 title claims abstract description 26
- 238000000034 method Methods 0.000 title claims abstract description 12
- 230000005855 radiation Effects 0.000 claims abstract description 20
- 230000003287 optical effect Effects 0.000 claims abstract description 14
- 238000011109 contamination Methods 0.000 claims abstract description 7
- 229920000136 polysorbate Polymers 0.000 claims 1
- 239000002245 particle Substances 0.000 abstract description 22
- 239000000779 smoke Substances 0.000 abstract description 8
- 238000010521 absorption reaction Methods 0.000 abstract description 5
- 239000000428 dust Substances 0.000 description 5
- 238000003466 welding Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000010147 laser engraving 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
- 230000005236 sound signal Effects 0.000 description 1
- 230000008093 supporting effect Effects 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
- 238000009834 vaporization Methods 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
Definitions
- the present invention relates to a method and an apparatus for checking the condition of a protective glass which is arranged between the workpiece and the laser optics in a laser machining system in which the laser beam, or any other substantially coaxial radiation, is arranged to pass through the glass before it is focused on the workpiece.
- protective glasses In order to protect the optical components in a laser machining system, for instance in a laser welding or engraving equipment, it is previously known to use protective glasses. Such protective glasses are then mounted between the laser optics and the object (workpiece) to be machined and prevents dirt and dust particles produced at the machining from entering into the laser optics.
- the incident laser beam also is the working, machining, beam it should be understood that such absorption and scattering of the beam is unsatisfactory as the power density of the focused beam is reduced.
- This is a disadvantage especially in a laser welding system as the welding capacity then is reduced.
- it is also a disadvantage in for instance a laser engraving system of the type illustrated in the Swedish Patent 9403349-5 in which small complex engraving patterns are made by means of the laser beam. If the beam is unsharp due to the scattering effect, the good quality of the pattern or script produced by the laser beam can not be maintained.
- thermo detector arranged to sense (detect) the temperature of the protective glass itself or the glass support- ing parts, specifically the mechanical protective glass holder.
- the thermal detector is combined with an optical detector of a previously known type, so that both types of dirt contamination can be controlled simultaneously.
- Figure 1 illustrates a known optical protective glass control arrangement in connection with laser machining
- FIG. 2 illustrates schematically an arrangement according to the invention
- Figure 3 illustrates a so-called sensor card with an opti- cal as well as a thermal detector
- Figure 4 illustrates more in detail the sensor card mounted in connection with the edge of the protective glass.
- FIG 1 it is illustrated schematically a focusing optical arrangement, symbolised by a lens 1, which concentrates the incident laser radiation on a workpiece 2.
- a lens 1 which concentrates the incident laser radiation on a workpiece 2.
- It can be a welding system, an engraving system like the one illustrated in SE 9403349-5, a cutting system or any other laser machining system.
- dirt and dust particles are produced from the workpiece during the machining process.
- a protective glass plate 3 is arranged between the workpiece 2 and the focusing lens 1.
- the protective glass plate is mounted in a holder 4 and it has a circular peripheral edge side.
- the dirt, dust and smoke particles 5 that are produced during the machining process are instead gathered on the protective glass surface 3.
- the particles can not enter into the more delicate optical system, but the disadvantage with such a system is that the particles are gradually accumulated on the glass surface and are causing an undesired scattering and absorption of a part of the incident laser radiation 6. Therefore, a photode- tector 8 is arranged at the edge side of the protective glass to sense the scattered radiation 7 on the glass edge 9, and which radiation is an indicia of the contamination layer on the protective glass.
- the photodetector senses the amount of radiation scattered by particles sticked on the protective glass surface. When the detector signal has reached a certain level, this is an indication that it is time to replace the protective glass. This means that the condition of the protective glass with respect to such particles which generate a scattered radiation can be controlled continuously during the machining process.
- a thermal detector 10 is also arranged in connection with the protective glass in order to measure the temperature of the protective glass and the surrounding mechanical parts. When the detector signal has reached a certain level this is an indication that it is time to replace the protective glass.
- the detector 10 itself could be of a known type and will not be described in any detail here.
- the thermal detector 10 is mounted together with the optical detector 8 on a sensor card 11, see figure 3.
- the sensor card 11 is mounted directly onto the mechanical part attaching the protective glass in the holder 4. This means that a good thermal contact is obtained with the holder 4, see figure 4.
- the optical detector 8 is mounted on the uppermost part of the card so that it is viewing the edge of the protective glass 3 through an optical window 13, i.e. analogous to what has been described in SE 97.00196-0.
- the card is attached to the holder 4 of the protective glass by means of a screw, bolt 14 or the like.
- the detectors are, by means of a contacting device 12 and conduits 15, connected to an electronic signal processing circuit, which electronic signal processing circuit in turn is cou- pled to indicating and display means (not shown).
- both the electronic signal processing circuit and the indicating and display means could be of a type which is known per se, they will not be described in any detail here. As soon as the signals exceed a certain, predetermined value, this is indicated by means of an audio
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Laser Beam Processing (AREA)
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE9801780A SE512097C2 (sv) | 1998-05-20 | 1998-05-20 | Metod och anordning för att övervaka status hos ett skyddsglas vid laserbearbetning |
| SE9801780 | 1998-05-20 | ||
| 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 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP1146986A1 true EP1146986A1 (en) | 2001-10-24 |
Family
ID=20411390
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP99925508A Withdrawn 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 |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP1146986A1 (sv) |
| JP (1) | JP2002515341A (sv) |
| SE (1) | SE512097C2 (sv) |
| WO (1) | WO1999059762A1 (sv) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106927257A (zh) * | 2017-03-29 | 2017-07-07 | 中国科学院西安光学精密机械研究所 | 激光聚变靶场光学诊断设备的保护玻璃自动更换装置 |
Families Citing this family (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE20206255U1 (de) * | 2002-04-19 | 2003-08-28 | Thyssen Laser Technik Gmbh | CO¶2¶ Laservorrichtung |
| EP1362662A1 (fr) * | 2002-05-08 | 2003-11-19 | Lasag Ag | Installation de soudage au laser et tête de soudage équipant une telle installation |
| DE10310854B3 (de) * | 2003-03-11 | 2004-09-30 | Erlas Erlanger Lasertechnik Gmbh | Verfahren, Überwachungsvorrichtung und Laserbearbeitungsanlage mit Fehlstellenüberwachung einer optischen Komponente |
| EP1488882B1 (de) * | 2003-06-20 | 2006-07-05 | TRUMPF Laser GmbH + Co. KG | Verfahren und Laserbearbeitungskopf mit einer Einrichtung zur Überwachung eines optischen Elements eines Bearbeitungskopfes einer Maschine zur thermischen Bearbeitung eines Werkstücks |
| EP1643281A1 (de) * | 2004-10-02 | 2006-04-05 | Trumpf Werkzeugmaschinen GmbH + Co. KG | Optisches Element einer Laserbearbeitungsmaschine und Halterung des optischen Elements |
| US20090242526A1 (en) * | 2008-03-26 | 2009-10-01 | Electro Scientific Industries, Inc. | Laser micromachining through a protective member |
| EP2643906B1 (en) * | 2010-11-23 | 2020-07-15 | IPG Photonics Corporation | Method and system for monitoring output of high power fiber laser system |
| DE102014205907B4 (de) * | 2014-03-31 | 2020-03-26 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Schutzvorrichtung zum Schutz vor Laserstrahlung |
| JP6097796B2 (ja) * | 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 | 高出力ファイバ型レーザシステムの出力を監視する方法およびシステム |
| CN105772961A (zh) * | 2016-03-29 | 2016-07-20 | 同高先进制造科技（太仓）有限公司 | 基于散射光检测激光头保护镜片污染监控装置及工作方法 |
| CN105665951A (zh) * | 2016-03-29 | 2016-06-15 | 同高先进制造科技（太仓）有限公司 | 基于散射光和温度检测的激光头护镜监控装置及工作方法 |
| EP3685953A4 (en) * | 2017-09-21 | 2021-03-03 | Panasonic Intellectual Property Management Co., Ltd. | LASER PROCESSING HEAD AND LASER PROCESSING SYSTEM USING THE SAME |
| KR102175421B1 (ko) * | 2018-10-28 | 2020-11-06 | 네모엔지니어링 주식회사 | 레이저 가공 장치 및 레이저 가공 시스템 |
| CN109759723A (zh) * | 2019-03-05 | 2019-05-17 | 奔腾激光(温州)有限公司 | 一种激光切割头 |
| JP7316500B2 (ja) | 2019-06-03 | 2023-07-28 | パナソニックＩｐマネジメント株式会社 | レーザ加工ヘッド及びそれを備えたレーザ加工装置 |
| CN115647621A (zh) * | 2022-10-14 | 2023-01-31 | 深圳市创想三维科技股份有限公司 | 检测组件、激光模组及其出光控制方法以及激光加工设备 |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0716795B2 (ja) * | 1988-01-19 | 1995-03-01 | ミヤチテクノス株式会社 | レーザ出射口保護ガラス板の汚れ検出装置 |
| JPH04118193A (ja) * | 1990-09-04 | 1992-04-20 | Hitachi Constr Mach Co Ltd | レーザ加工装置の保護ガラス監視装置 |
| DE19605018A1 (de) * | 1996-01-31 | 1997-08-07 | Inpro Innovations Gmbh | Verfahren zum Überwachen der Verschmutzung eines Schutzglases einer Laserschweißoptik beim Laserschweißen und Anordnung zur Durchführung des Verfahrens |
-
1998
- 1998-05-20 SE SE9801780A patent/SE512097C2/sv not_active IP Right Cessation
-
1999
- 1999-04-13 WO PCT/SE1999/000592 patent/WO1999059762A1/en not_active Application Discontinuation
- 1999-04-13 EP EP99925508A patent/EP1146986A1/en not_active Withdrawn
- 1999-04-13 JP JP2000549415A patent/JP2002515341A/ja active Pending
Non-Patent Citations (1)
| Title |
|---|
| See references of WO9959762A1 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106927257A (zh) * | 2017-03-29 | 2017-07-07 | 中国科学院西安光学精密机械研究所 | 激光聚变靶场光学诊断设备的保护玻璃自动更换装置 |
| CN106927257B (zh) * | 2017-03-29 | 2023-04-11 | 中国科学院西安光学精密机械研究所 | 激光聚变靶场光学诊断设备的保护玻璃自动更换装置 |
Also Published As
| Publication number | Publication date |
|---|---|
| WO1999059762A1 (en) | 1999-11-25 |
| SE9801780D0 (sv) | 1998-05-20 |
| SE512097C2 (sv) | 2000-01-24 |
| SE9801780L (sv) | 1999-11-21 |
| JP2002515341A (ja) | 2002-05-28 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
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| 17P | Request for examination filed |
Effective date: 20001219 |
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| AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE |
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| RBV | Designated contracting states (corrected) |
Designated state(s): AT BE CH CY DE DK ES LI |
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| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
| 18D | Application deemed to be withdrawn |
Effective date: 20031101 |