DE10329744A1 - Process for determining the focus position of a laser beam in relation to the workpiece surface e.g. in welding comprises comparing a characteristic of a luminescent plate formed on the surface by the laser beam with a reference value - Google Patents
Process for determining the focus position of a laser beam in relation to the workpiece surface e.g. in welding comprises comparing a characteristic of a luminescent plate formed on the surface by the laser beam with a reference value Download PDFInfo
- Publication number
- DE10329744A1 DE10329744A1 DE2003129744 DE10329744A DE10329744A1 DE 10329744 A1 DE10329744 A1 DE 10329744A1 DE 2003129744 DE2003129744 DE 2003129744 DE 10329744 A DE10329744 A DE 10329744A DE 10329744 A1 DE10329744 A1 DE 10329744A1
- Authority
- DE
- Germany
- Prior art keywords
- focus position
- laser beam
- determining
- workpiece surface
- characteristic
- 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.)
- Ceased
Links
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000003466 welding Methods 0.000 title description 4
- 239000007787 solid Substances 0.000 claims abstract description 8
- 238000003754 machining Methods 0.000 claims description 7
- 238000012545 processing Methods 0.000 claims description 7
- 238000005304 joining Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 241001620634 Roger Species 0.000 description 2
- 239000003518 caustics Substances 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 238000003384 imaging method Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000012552 review Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
- G01J1/4257—Photometry, e.g. photographic exposure meter using electric radiation detectors applied to monitoring the characteristics of a beam, e.g. laser beam, headlamp beam
-
- 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
- B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
- B23K26/04—Automatically aligning, aiming or focusing the laser beam, e.g. using the back-scattered light
Landscapes
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- General Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Laser Beam Processing (AREA)
Abstract
Description
Die Erfindung betrifft ein Verfahren zur Bestimmung der Fokuslage eines Laserstrahls bezüglich einer Festkörperoberfläche, insbesondere einer Werkstückoberfläche, nach der Gattung der unabhängigen Ansprüche.The invention relates to a method for determining the focus position of a laser beam with respect to a Solid surface, in particular a workpiece surface, after the genus of the independent Expectations.
Bei einer Bearbeitung von Werkstückoberflächen mittels eines Laserstrahls, wie beispielsweise Schweißen, Schneiden oder Bohren, wird die Qualität des Bearbeitungsergebnisses stark beeinflusst von der Fokuslage des Laserstrahls bezüglich der Werkstückoberfläche. Die Fokuslage bestimmt in hohem Maße die Leistungsdichteverteilung im Bearbeitungsort auf der Werkstückoberfläche. So beträgt etwa die Toleranzgrenze der Fokuslagenabweichung für den Schweißprozess in der industriellen Fertigung nur wenige 100 μm.When machining workpiece surfaces using a laser beam, such as welding, cutting or drilling, becomes the quality of the processing result strongly influenced by the focus position of the laser beam with respect the workpiece surface. The Focus position determines to a high degree the power density distribution in the machining location on the workpiece surface. So is about the tolerance limit of the focus position deviation for the welding process only a few 100 μm in industrial production.
Um eine solch genaue Einstellung der Fokuslage erreichen zu können, ist die Bestimmung der Fokuslage von großer Wichtigkeit.Such an exact setting to be able to reach the focus position determining the focus position is of great importance.
Aus der nicht vorveröffentlichten
Schrift
Vorteile der ErfindungAdvantages of invention
Das erste erfindungsgemäße Verfahren zur Bestimmung der Fokuslage eines Laserstrahls bezüglich einer Festkörperoberfläche, insbesondere einer Werkstückoberfläche, hat den Vorteil, dass eine einfache und genaue Auswertung der Fokuslage ermöglicht wird. Das zweite erfindungsgemäße Verfahren hat den Vorteil, dass eine Überprüfung der Fokuslage bereits vor dem ersten Bearbeitungsprozess durchgeführt werden kann. Beiden Verfahren ist es somit gemeinsam, dass sie die Werkstückoberfläche nicht verändern. Vorteilhafte Weiterbildungen der erfindungsgemäßen Verfahren sind in den Unteransprüchen angegeben.The first method according to the invention for determining the focus position of a laser beam with respect to a Solid surface, in particular a workpiece surface the advantage that a simple and accurate evaluation of the focus position allows becomes. The second method according to the invention has the advantage that a review of the Focus position must be carried out before the first machining process can. It is therefore common to both methods that they do not have the workpiece surface change. Advantageous developments of the method according to the invention are specified in the subclaims.
Bei einer bevorzugten Ausführungsform erfasst eine Kamera das Bild der Leuchtscheibe und ein Auswerteprogramm vergleicht ein oder mehrere Merkmale der Leuchtscheibe mit gespeicherten Referenzwerten. Damit ist das gesamte Verfahren berührungs- und verschleißfrei, eine Beschädigung oder Veränderung der Werkstückoberfläche ausgeschlossen.In a preferred embodiment A camera captures the image of the light disk and an evaluation program compares one or more features of the light disk with saved ones Reference values. The entire process is thus and wear-free, damage or change excluded the workpiece surface.
Ausführungsbeispiele der Erfindung werden anhand der Zeichnung und der nachfolgenden Beschreibung näher erläutert. Es zeigen:Embodiments of the invention are explained in more detail with reference to the drawing and the description below. It demonstrate:
Beschreibung der Ausführungsbeispieledescription of the embodiments
Die
Der Laserstrahl
Ein kontrolliertes Arbeiten mit dem
Laserstrahl
In der
Zuletzt ist eine vierte Querschnittsfläche
Soll nun mit dem Aufbau der Anlage
Dazu wird mittels eines oder mehrerer
kurzer, leistungsschwacher Laserpulse der Laserstrahl
Das Bild der Leuchtscheibe
Die Laserpulse können mit einer geeigneten Rate wiederholt werden, um auch bei langsamen Kameras ein hinreichend deutliches Bild zu ermöglichen.The laser pulses can be sent at an appropriate rate repeated to be sufficient even with slow cameras enable clear picture.
Das von der Kamera
Die Anpassung der Fokuslage
In
Bei dem ersten Ausführungsbeispiel
dient die Fokuslagenbestimmung zur optimalen Bearbeitung eines Werkstückes. Bei
dem in der
Claims (8)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2003129744 DE10329744A1 (en) | 2003-07-02 | 2003-07-02 | Process for determining the focus position of a laser beam in relation to the workpiece surface e.g. in welding comprises comparing a characteristic of a luminescent plate formed on the surface by the laser beam with a reference value |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2003129744 DE10329744A1 (en) | 2003-07-02 | 2003-07-02 | Process for determining the focus position of a laser beam in relation to the workpiece surface e.g. in welding comprises comparing a characteristic of a luminescent plate formed on the surface by the laser beam with a reference value |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE10329744A1 true DE10329744A1 (en) | 2004-09-30 |
Family
ID=32921175
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE2003129744 Ceased DE10329744A1 (en) | 2003-07-02 | 2003-07-02 | Process for determining the focus position of a laser beam in relation to the workpiece surface e.g. in welding comprises comparing a characteristic of a luminescent plate formed on the surface by the laser beam with a reference value |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE10329744A1 (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102008010981A1 (en) * | 2008-02-25 | 2009-08-27 | Mtu Aero Engines Gmbh | Method and device for automatic laser focusing |
| WO2012022951A1 (en) * | 2010-08-16 | 2012-02-23 | Gsi Group Limited | Method of and material processing apparatus for optimising the focus of a fibre laser; method of measuring changes in the focus of a fibre laser |
| US8304691B2 (en) | 2005-06-23 | 2012-11-06 | Trumpf Werkzeugmaschinen Gmbh + Co. Kg | Determining a focal position of a laser |
| DE102014000330B3 (en) * | 2014-01-14 | 2015-03-12 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Method for monitoring and controlling the focus position of a laser beam during laser cutting |
| DE102014000663A1 (en) | 2014-01-22 | 2015-07-23 | Photon Energy Gmbh | Device for detecting a focal position and method for this purpose |
| US20190232434A1 (en) * | 2016-10-13 | 2019-08-01 | Trumpf Werkzeugmaschinen Gmbh + Co. Kg | Determining and regulating a focal position of a processing beam |
| WO2019170411A1 (en) * | 2018-03-08 | 2019-09-12 | Precitec Gmbh & Co. Kg | Device for determining a focus position in a laser machining system, laser machining system comprising same, and method for determining a focus position in a laser machining system |
| DE102022200273A1 (en) | 2022-01-13 | 2023-07-13 | Robert Bosch Gesellschaft mit beschränkter Haftung | Beam parameter determination device, method for determining at least one beam parameter of a laser beam, computer program and machine-readable storage medium |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19520213C2 (en) * | 1994-06-02 | 1997-05-15 | Mitsubishi Electric Corp | Laser processing device |
| DE10244548A1 (en) * | 2002-09-25 | 2004-04-08 | Robert Bosch Gmbh | Position determination method for laser beam relative to workpiece surface, comprises measuring process parameters during processing, and determining focus position by comparing measured values with function values |
-
2003
- 2003-07-02 DE DE2003129744 patent/DE10329744A1/en not_active Ceased
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19520213C2 (en) * | 1994-06-02 | 1997-05-15 | Mitsubishi Electric Corp | Laser processing device |
| DE10244548A1 (en) * | 2002-09-25 | 2004-04-08 | Robert Bosch Gmbh | Position determination method for laser beam relative to workpiece surface, comprises measuring process parameters during processing, and determining focus position by comparing measured values with function values |
Non-Patent Citations (2)
| Title |
|---|
| Englische Übersetzung der JP 2001150171A aus Searching PAJ, JPO (online), recherchiert am 20.1. 2004). Im Internet: <URL:http://www19.ipld.jpo.go. jp/PA1/cgi-bin/PA1DETAIL>, DETAILLED DESCRIPTION, DRAWINGS.B23K26/04 |
| Englische Übersetzung der JP 2001150171A aus Searching PAJ, JPO (online), recherchiert am 20.1.2004). Im Internet: <URL:http://www19.ipld.jpo.go.jp/PA1/cgi-bin/PA1DETAIL>, DETAILLED DESCRIPTION, DRAWINGS.B23K26/04 * |
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8304691B2 (en) | 2005-06-23 | 2012-11-06 | Trumpf Werkzeugmaschinen Gmbh + Co. Kg | Determining a focal position of a laser |
| DE102008010981A1 (en) * | 2008-02-25 | 2009-08-27 | Mtu Aero Engines Gmbh | Method and device for automatic laser focusing |
| US8379194B2 (en) | 2008-02-25 | 2013-02-19 | Mtu Aero Engines Gmbh | Method and device for automatic laser focusing |
| WO2012022951A1 (en) * | 2010-08-16 | 2012-02-23 | Gsi Group Limited | Method of and material processing apparatus for optimising the focus of a fibre laser; method of measuring changes in the focus of a fibre laser |
| JP2013535340A (en) * | 2010-08-16 | 2013-09-12 | ジーエスアイ グループ リミテッド | Fiber laser focus optimization method, material processing apparatus, and fiber laser focus change measurement method |
| US9233434B2 (en) | 2010-08-16 | 2016-01-12 | Spi Lasers Uk Limited | Method of and material processing apparatus for optimising the focus of a fibre laser; method of measuring changes in the focus of a fibre laser |
| WO2015106775A1 (en) | 2014-01-14 | 2015-07-23 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Method for monitoring and adjusting the focus position of a machining laser beam during laser cutting |
| DE102014000330B3 (en) * | 2014-01-14 | 2015-03-12 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Method for monitoring and controlling the focus position of a laser beam during laser cutting |
| DE102014000663A1 (en) | 2014-01-22 | 2015-07-23 | Photon Energy Gmbh | Device for detecting a focal position and method for this purpose |
| DE102014000663B4 (en) * | 2014-01-22 | 2017-05-11 | Photon Energy Gmbh | Device for detecting a focal position and method for this purpose |
| US20190232434A1 (en) * | 2016-10-13 | 2019-08-01 | Trumpf Werkzeugmaschinen Gmbh + Co. Kg | Determining and regulating a focal position of a processing beam |
| US12508673B2 (en) * | 2016-10-13 | 2025-12-30 | TRUMPF Werkzeugmaschinen SE + Co. KG | Determining and regulating a focal position of a processing beam |
| WO2019170411A1 (en) * | 2018-03-08 | 2019-09-12 | Precitec Gmbh & Co. Kg | Device for determining a focus position in a laser machining system, laser machining system comprising same, and method for determining a focus position in a laser machining system |
| US11766740B2 (en) | 2018-03-08 | 2023-09-26 | Precitec Gmbh & Co. Kg | Device for determining a focus position in a laser machining system, laser machining system comprising same, and method for determining a focus position in a laser machining system |
| DE102022200273A1 (en) | 2022-01-13 | 2023-07-13 | Robert Bosch Gesellschaft mit beschränkter Haftung | Beam parameter determination device, method for determining at least one beam parameter of a laser beam, computer program and machine-readable storage medium |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| OAV | Applicant agreed to the publication of the unexamined application as to paragraph 31 lit. 2 z1 | ||
| OP8 | Request for examination as to paragraph 44 patent law | ||
| 8131 | Rejection |