DE102007056554A1 - Method for adjusting and/or controlling the optimum working conditions of a laser used in laser welding comprises superimposing an intensity pattern on the radiation throat and determining the focusing position by evaluating the pattern - Google Patents
Method for adjusting and/or controlling the optimum working conditions of a laser used in laser welding comprises superimposing an intensity pattern on the radiation throat and determining the focusing position by evaluating the pattern Download PDFInfo
- Publication number
- DE102007056554A1 DE102007056554A1 DE102007056554A DE102007056554A DE102007056554A1 DE 102007056554 A1 DE102007056554 A1 DE 102007056554A1 DE 102007056554 A DE102007056554 A DE 102007056554A DE 102007056554 A DE102007056554 A DE 102007056554A DE 102007056554 A1 DE102007056554 A1 DE 102007056554A1
- Authority
- DE
- Germany
- Prior art keywords
- laser
- intensity pattern
- pattern
- focus
- laser beam
- 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- Withdrawn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
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
- B23K26/02—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
- B23K26/046—Automatically focusing the laser 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
- B23K26/03—Observing, e.g. monitoring, the workpiece
- B23K26/032—Observing, e.g. monitoring, the workpiece using optical means
-
- 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
- B23K26/06—Shaping the laser beam, e.g. by masks or multi-focusing
- B23K26/064—Shaping the laser beam, e.g. by masks or multi-focusing by means of optical elements, e.g. lenses, mirrors or prisms
- B23K26/066—Shaping the laser beam, e.g. by masks or multi-focusing by means of optical elements, e.g. lenses, mirrors or prisms by using masks
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- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Laser Beam Processing (AREA)
Abstract
Description
Stand der TechnikState of the art
Die Erfindung geht aus von einem Verfahren zum Einstellen und/oder Kontrollieren des prozessoptimalen Arbeitsabstands eines Lasers von einem zu bearbeitenden Werkstück, insbesondere beim Laserschweißen oder Laserbohren, nach dem Oberbegriff des Anspruchs 1.The The invention is based on a method for adjusting and / or checking the process optimal working distance of a laser from a to be processed Workpiece, especially in laser welding or Laser drilling, according to the preamble of claim 1.
Bei der Prozesseinstellung von Schweiß- oder Bohrlasern ist eine exakte Einstellung des Fokus des Laserstrahls auf ein zu bearbeitendes Bauteil, im folgenden Werkstück genannt, ausschlaggebend für ein qualitativ hochwertiges Arbeitsergebnis, da im Fokus die höchste Energiedichte des Lasers vorhanden ist. Um den richtigen Arbeitsabstand des Lasers zum Werkstück einzustellen, zu kontrollieren und ggf. zu korrigieren, wird die Position der Strahltaille des fokussierten Laserstrahls dadurch bestimmt, dass mit dem Laserstrahl in Probewerkstücken, die in unterschiedlichen Arbeitsabständen angeordnet werden, jeweils ein Einbrand erzeugt und die Veränderung des Einbranddurchmessers in den Probewerkstücken untersucht wird. Die Position des Probewerkstücks mit dem durchmesserkleinsten Einbrand ist der Fokuspunkt des Laserstrahls und der prozessoptimierte Arbeitsabstand des Lasers bezüglich des Werkstücks.at the process setting of welding or drilling lasers is an exact adjustment of the focus of the laser beam on a to be processed Component, referred to in the following workpiece, decisive for a high quality work result, since in the Focus the highest energy density of the laser is present. The correct working distance of the laser to the workpiece adjust, control and correct if necessary, the Position of the beam waist of the focused laser beam thereby determines that with the laser beam in sample workpieces, which are arranged at different working distances, each generates a penetration and the change of Einbranddurchmessers is examined in the Trieberkstücken. The position of the trial workpiece with the smallest diameter penetration is the focal point of the laser beam and the process-optimized working distance of the laser with respect to of the workpiece.
Bei längeren Brennweiten in Verbindung mit Lasern hoher Strahlqualität, wie sie z. B. für das Schweißen eingesetzt werden, ist die Strahltaille so schwach ausgeprägt, dass diese Methode nicht zu einer nutzbaren Auflösung führt, um den Fokus zu ermitteln. In vielen Fällen verzichtet man daher auf eine exakte Bestimmung der Fokuslage, obwohl die Fokuslage ein prozessbestimmender Parameter ist.at longer focal lengths in conjunction with lasers of high beam quality, as they are z. B. be used for welding, the beam waist is so weak that this Method does not lead to a usable resolution, to determine the focus. In many cases omitted Therefore, we focus on an exact determination of the focus position, although the focus position is a process-determining parameter.
Offenbarung der ErfindungDisclosure of the invention
Das erfindungsgemäße Verfahren mit den Merkmalen des Anspruchs 1 hat den Vorteil, dass die Position des Fokus mit deutlich verbesserter Auflösung darstellbar ist und somit das Finden des exakten Arbeitsabstandes des Laser vom Werkstück auch bei Lasern mit hoher Strahlqualität und Brennweite ermöglicht und vereinfacht wird. Dadurch, dass die Ausdehnung des durch Intensitätsmodulation erzeugten Intensitätsmusters in Strahlrichtung deutlich schärfer begrenzt ist als die Strahltaille selbst, vorzugsweise auf 0,05 mm und weniger, kann die Position des Fokus durch Begutachtung der Einbrandmuster in den Probewerkstücken sehr genau bestimmt und eingestellt werden. Die Erzeugung des in Strahlrichtung eng begrenzten Intensitätsmusters erfolgt in einfacher Weise mittels eines diffraktiven optischen Elements mit einer geeigneten Oberflächenstruktur oder mittels eines Gitters, das jeweils in den Laserstrahl eingeschoben wird.The inventive method with the features of Claim 1 has the advantage that the position of the focus with clearly improved resolution is displayed and thus finding the exact working distance of the laser from the workpiece also at Lasers with high beam quality and focal length allows and simplified. Because of the expansion of the by intensity modulation generated intensity pattern in the beam direction significantly sharper is limited as the beam waist itself, preferably to 0.05 mm and less, the position of the focus can be checked by appraising the Burn-in pattern determined very precisely in the sample workpieces and be adjusted. The generation of the jet in the narrow direction limited intensity pattern is done in a simple manner by means of a diffractive optical element with a suitable Surface structure or by means of a grid, respectively is inserted into the laser beam.
Durch die in den weiteren Ansprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen des im Anspruch 1 angegebenen Verfahrens möglich.By the measures listed in the further claims are advantageous developments and improvements of the claim 1 specified method possible.
Gemäß einer vorteilhaften Ausführungsform der Erfindung wird als Intensitätsmuster ein Linienmuster erzeugt und die Lage des Fokus im Einbrandmuster an dem Grad der Scharfkantigkeit der Linien im Linienmuster bewertet, wobei vorzugsweise das Einbrandmuster visuell mittels einer Lupe oder eines Mikroskops betrachtet wird.According to one advantageous embodiment of the invention is called intensity pattern a line pattern is generated and the location of the focus in the burn-in pattern evaluated at the degree of sharpness of the lines in the line pattern, preferably the burn-in pattern visually by means of a magnifying glass or a microscope.
Kurze Beschreibung der ZeichnungShort description of the drawing
Die Erfindung ist anhand eines in der Zeichnung dargestellten Ausführungsbeispiels in der nachfolgenden Beschreibung näher erläutert. Es zeigen:The Invention is based on an embodiment shown in the drawing explained in more detail in the following description. Show it:
In
Durch
Einsetzen eines diffraktiven optischen Elements
Diffraktive
optische Elemente sind Glasträger, auf die durch Fotolithographie
Mikrostrukturen aufgebracht sind. Durch unterschiedliche Weglängen der
Teilstrahlen des Laserlichtbündels innerhalb des diffraktiven
optischen Elements kommt es zu Phasenmodulationen, wodurch Indifferenzmuster
im Laserstrahl entstehen. Zusätzlich wird durch konstruktive
und destruktive Überlagerung die Amplitude moduliert, so
dass sich im Laserstrahl ein Intensitätsmuster ausbilden
lässt. Ein diffraktives optisches Element ist beispielsweise
in der
Mit
dem Laserstrahl
Wie
in den Diagrammen der
Für
das Vermessen des Fokus
ZITATE ENTHALTEN IN DER BESCHREIBUNGQUOTES INCLUDE IN THE DESCRIPTION
Diese Liste der vom Anmelder aufgeführten Dokumente wurde automatisiert erzeugt und ist ausschließlich zur besseren Information des Lesers aufgenommen. Die Liste ist nicht Bestandteil der deutschen Patent- bzw. Gebrauchsmusteranmeldung. Das DPMA übernimmt keinerlei Haftung für etwaige Fehler oder Auslassungen.This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.
Zitierte PatentliteraturCited patent literature
- - EP 0765488 B1 [0013] - EP 0765488 B1 [0013]
Claims (6)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102007056554A DE102007056554A1 (en) | 2007-11-23 | 2007-11-23 | Method for adjusting and/or controlling the optimum working conditions of a laser used in laser welding comprises superimposing an intensity pattern on the radiation throat and determining the focusing position by evaluating the pattern |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102007056554A DE102007056554A1 (en) | 2007-11-23 | 2007-11-23 | Method for adjusting and/or controlling the optimum working conditions of a laser used in laser welding comprises superimposing an intensity pattern on the radiation throat and determining the focusing position by evaluating the pattern |
Publications (1)
Publication Number | Publication Date |
---|---|
DE102007056554A1 true DE102007056554A1 (en) | 2009-05-28 |
Family
ID=40576997
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE102007056554A Withdrawn DE102007056554A1 (en) | 2007-11-23 | 2007-11-23 | Method for adjusting and/or controlling the optimum working conditions of a laser used in laser welding comprises superimposing an intensity pattern on the radiation throat and determining the focusing position by evaluating the pattern |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE102007056554A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2012041346A1 (en) * | 2010-09-30 | 2012-04-05 | Wavelight Gmbh | Method for testing a laser device |
US8687178B2 (en) | 2010-09-30 | 2014-04-01 | Wavelight Gmbh | Process for testing a laser device |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0765488B1 (en) | 1994-06-18 | 1998-10-21 | Forschungszentrum Karlsruhe GmbH | Grating structure and its use |
-
2007
- 2007-11-23 DE DE102007056554A patent/DE102007056554A1/en not_active Withdrawn
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0765488B1 (en) | 1994-06-18 | 1998-10-21 | Forschungszentrum Karlsruhe GmbH | Grating structure and its use |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2012041346A1 (en) * | 2010-09-30 | 2012-04-05 | Wavelight Gmbh | Method for testing a laser device |
US8687178B2 (en) | 2010-09-30 | 2014-04-01 | Wavelight Gmbh | Process for testing a laser device |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
R119 | Application deemed withdrawn, or ip right lapsed, due to non-payment of renewal fee |
Effective date: 20130601 |