DE202006003424U1 - Mechanism for workpiece cutting by carbon dioxide (CO2) laser beam, with cutter head for laser beam emission, with laser beam focussing device - Google Patents

Mechanism for workpiece cutting by carbon dioxide (CO2) laser beam, with cutter head for laser beam emission, with laser beam focussing device Download PDF

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Publication number
DE202006003424U1
DE202006003424U1 DE202006003424U DE202006003424U DE202006003424U1 DE 202006003424 U1 DE202006003424 U1 DE 202006003424U1 DE 202006003424 U DE202006003424 U DE 202006003424U DE 202006003424 U DE202006003424 U DE 202006003424U DE 202006003424 U1 DE202006003424 U1 DE 202006003424U1
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Germany
Prior art keywords
laser beam
workpiece
folding mirror
cutting
cutter head
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DE202006003424U
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German (de)
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Rofin Sinar Laser GmbH
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Rofin Sinar Laser GmbH
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Priority to DE202006003424U priority Critical patent/DE202006003424U1/en
Publication of DE202006003424U1 publication Critical patent/DE202006003424U1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B23K26/36—Removing material
    • B23K26/38—Removing material by boring or cutting
    • 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
    • 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
    • B23K26/0643—Shaping the laser beam, e.g. by masks or multi-focusing by means of optical elements, e.g. lenses, mirrors or prisms comprising mirrors
    • 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
    • B23K26/0648—Shaping the laser beam, e.g. by masks or multi-focusing by means of optical elements, e.g. lenses, mirrors or prisms comprising lenses
    • 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
    • B23K26/0665—Shaping the laser beam, e.g. by masks or multi-focusing by beam condensation on the workpiece, e.g. for focusing

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Mechanical Engineering (AREA)
  • Laser Beam Processing (AREA)
  • Lenses (AREA)

Abstract

Mechanism for cutting workpiece (10) by CO2 laser beam (25) contains cutter head (2) for laser beam emission. Laser beam is focussed by focussing device (12) and folding mirror module (14,20) guides focussed laser beam to workpiece.Preferably folding mirror module is fitted behind focussing device in laser beam propagation direction. Typically, folding mirror module comprises at least two folding mirrors affecting sharp-angled Z-folding of laser beam.

Description

Die Erfindung bezieht sich auf eine Einrichtung zum Schneiden eines Werkstückes mit einem Laserstrahl, insbesondere mit einem Laserstrahl eines CO2-Lasers.The invention relates to a device for cutting a workpiece with a laser beam, in particular with a laser beam of a CO 2 laser.

Mit einem CO2-Laser, insbesondere sogenannte CO2-Bandleiterlaser, wie sie beispielsweise aus der US 4,719,639 A oder aus der EP 0 305 893 A2 bekannt sind, werden Laserstrahlen mit einer sehr hohen Strahlqualität, d.h. sehr kleinem Strahlparameterprodukt erzeugt, die dementsprechend eine sehr gute Fokussierbarkeit aufweisen. Beim Schneiden von Werkstücken mit größeren Blechstärken kann es jedoch von Vorteil sein, Laserstrahlen mit größerem Fokusdurchmesser zu verwenden. Da der Durchmesser eines Laserstrahls in seinem Fokus im wesentlichen proportional zur Brennweite der zum Fokussieren verwendeten Fokussiereinheit, in der Regel eine Linse, ist, kann eine solche Vergrößerung des Fokusdurchmessers durch entsprechende Erhöhung der Brennweite der Fokussiereinrichtung erreicht werden. Dies erfordert den Einsatz von Schneidköpfen mit großer Baulänge, die einen entsprechenden Platzbedarf in der Laserschneidanlage erfordern, der in vielen Anwendungsfällen nicht zur Verfügung steht.With a CO 2 laser, in particular so-called CO 2 -Bandleiterlaser, as for example from the US 4,719,639 A or from the EP 0 305 893 A2 are known, laser beams are generated with a very high beam quality, ie very small beam parameter product, which accordingly have a very good focusability. When cutting workpieces with larger sheet thicknesses, however, it may be advantageous to use laser beams with a larger focus diameter. Since the diameter of a laser beam in its focus is substantially proportional to the focal length of the focusing unit used for focusing, usually a lens, such enlargement of the focus diameter can be achieved by correspondingly increasing the focal length of the focusing means. This requires the use of cutting heads with a large overall length, which require a corresponding space requirement in the laser cutting system, which is not available in many applications.

Der Erfindung liegt nun die Aufgabe zu Grunde, eine Einrichtung zum Schneiden eines Werkstücks mit einem Laserstrahl, insbesondere mit einem Laserstrahl eines CO2-Lasers anzugeben, mit der auch bei kleineren räumlichen Abmessungen des Schneid kopf es das Laserstrahlschneiden dicker Werkstücke bei Verwendung eines Laserstrahls hoher Strahlqualität verbessert ist.The invention is based on the object to provide a device for cutting a workpiece with a laser beam, in particular with a laser beam of a CO 2 laser, with it even with smaller spatial dimensions of the cutting head it laser beam cutting thicker workpieces using a laser beam higher Beam quality is improved.

Die genannte Aufgabe wird gemäß der Erfindung gelöst mit einer Einrichtung mit den Merkmalen des Anspruches 1. Gemäß diesen Merkmalen enthält die Einrichtung zum Schneiden eines Werkstückes mit einem Laserstrahl, insbesondere mit einem Laserstrahl eines CO2-Lasers einen Schneidkopf, aus dem der Laserstrahl zum Werkstück hin austritt, der eine Fokussiereinrichtung zum Fokussieren des Laserstrahls sowie eine Faltspiegelanordnung zum Führen des fokussierten Laserstrahlen enthält. Durch diese Maßnahme ist es möglich, bei nach wie vor geringen Abmessungen des Schneidkopfes eine langbrennweitige Fokussiereinrichtung einzusetzen, um auf diese Weise einen größeren Strahldurchmesser im Fokus zu erhalten.The above object is achieved according to the invention with a device having the features of claim 1. According to these features, the device for cutting a workpiece with a laser beam, in particular with a laser beam of a CO 2 laser, a cutting head, from which the laser beam to the workpiece out, which includes a focusing device for focusing the laser beam and a folding mirror assembly for guiding the focused laser beams. By this measure it is possible, while still small dimensions of the cutting head to use a long focal length focusing device to obtain in this way a larger beam diameter in focus.

Eine besonders kompakte Ausführungsform wird erreicht, wenn im Schneidkopf eine der Fokussiereinrichtung in Ausbreitungsrichtung des Laserstrahls nachgeordnete Faltspiegelanordnung angeordnet ist, die insbesondere wenigstens einen ersten und einen zweiten Faltspiegel umfasst, die eine spitzwinklige Z-Faltung des Laserstrahls bewirken.A becomes particularly compact embodiment achieved when in the cutting head one of the focusing device in the propagation direction the laser beam downstream folding mirror arrangement is arranged, in particular at least a first and a second folding mirror includes, which cause an acute-angled Z-fold of the laser beam.

Zur weiteren Erläuterung der Erfindung wird auf das Ausführungsbeispiel der Zeichnung verwiesen, in deren einziger Figur ein Schneidkopf einer erfindungsgemäßen Einrichtung zu Schneiden eines Werkstückes in einer teilweise geschnittenen perspektivischen Darstellung veranschaulicht ist.to further explanation The invention is based on the embodiment referred to the drawing, in the single figure, a cutting head a device according to the invention for cutting a workpiece illustrated in a partially sectioned perspective view is.

Gemäß dieser Figur umfasst der Schneidkopf 2 ein Gehäuse 4 mit einer Eintrittsöffnung 6 für einen von einer in der Figur nicht dargestellten Laserquelle erzeugten Laserstrahl LS sowie einer Austrittsöffnung 8, aus dem der innerhalb des Schneidkopfes 2 fokussierte Laserstrahl LS zu einem Werkstück 10 hin austritt, um dieses durch eine Relativbewegung zwischen Schneidkopf 2 und Werkstück 4 zu schneiden. Bei dem Laserstrahl LS handelt es sich insbesondere um den Laserstrahl eines CO2-Lasers, mit dem in das Werkstück 10 durch sogenanntes Schmelzschneiden ein Schnitt eingebracht wird. In der Nähe der Eintrittsöffnung 6 befindet sich eine Fokussiereinrichtung 12, im Beispiel eine Linse, mit der der Laserstrahl LS fokussiert wird. Der fokussierte Laserstrahl LS trifft auf einen ersten Faltspiegel 14, dessen Normale 16 unter einem spitzen Winkel α zur optischen Achse 18 der Linse 12 und damit auch annährend zur Mittenachse des Laserstrahl LS orientiert ist. Der erste Faltspiegel 14 reflektiert den fokussierten Laserstrahl zu einem zweiten Faltspiegel 20, dessen Spiegelfläche parallel zur Spiegelfläche des ersten Faltspiegels 14 angeordnet ist, so dass die Mittenachse 22 des von ihm reflektierten Laserstrahles LS erneut parallel zur optischen Achse 18 der Linse 12 verläuft. Auf diese Weise wird eine spitzwinklige Z-Faltung erzeugt. Die Brennweite der Linse kann dadurch größenordnungsmäßig um einen Faktor 3 größer sein als die Bauhöhe h des Schneidkopfes 2 zwischen Eintrittsöffnung 6 und Austrittsöffnung 8, so dass eine Vergrößerung des Fokusdurchmessers ebenfalls etwa um den Faktor 3 erreicht wird.According to this figure, the cutting head comprises 2 a housing 4 with an entrance opening 6 for a laser beam LS generated by a laser source, not shown in the figure, and an outlet opening 8th from which the inside of the cutting head 2 focused laser beam LS to a workpiece 10 out to this by a relative movement between the cutting head 2 and workpiece 4 to cut. In particular, the laser beam LS is the laser beam of a CO 2 laser, with which the workpiece 10 a cut is made by so-called fusion cutting. Near the entrance 6 there is a focusing device 12 In the example, a lens with which the laser beam LS is focused. The focused laser beam LS encounters a first folding mirror 14 , its normal 16 at an acute angle α to the optical axis 18 the lens 12 and thus also oriented approximately to the center axis of the laser beam LS. The first folding mirror 14 reflects the focused laser beam to a second folding mirror 20 whose mirror surface is parallel to the mirror surface of the first folding mirror 14 is arranged so that the center axis 22 the laser beam LS reflected by him again parallel to the optical axis 18 the lens 12 runs. In this way, an acute-angled Z-fold is generated. The focal length of the lens can be order of magnitude greater by a factor of 3 than the height h of the cutting head 2 between entrance opening 6 and outlet 8th , so that an enlargement of the focus diameter is also achieved by about a factor of 3.

Die Erfindung ist nicht auf die dargestellte Ausführungsform mit einer einzigen Fokussierlinse 12 oder zwei Faltspiegeln 14, 20 beschränkt. Darüber hinaus können an Stelle oder zusätzlich zu einer Linse 12 auch fokussierende Faltspiegel vorgesehen sein, so dass durch Auswechseln der optischen Komponenten innerhalb des Schneidkopfes 2 auf einfache Weise eine Anpassung der Brennweite des Systems an die jeweilige Schneidaufgabe erfolgen kann.The invention is not limited to the illustrated embodiment with a single focusing lens 12 or two folding mirrors 14 . 20 limited. In addition, in place or in addition to a lens 12 Folding folding mirrors may also be provided, so that by replacing the optical components within the cutting head 2 In a simple way, an adjustment of the focal length of the system to the respective cutting task can be done.

Claims (3)

Einrichtung zum Schneiden eines Werkstückes (10) mit einem Laserstrahl (LS), insbesondere mit einem Laserstrahl (LS) eines CO2-Lasers, mit einem Schneidkopf (2), aus dem der Laserstrahl (LS) zum Werkstück (10) hin austritt, und der eine Fokussiereinrichtung (12) zum Fokussieren des Laserstrahls sowie eine Faltspiegelanordnung (14, 20) zum Führen des fokussierten Laserstrahls (LS) enthält.Device for cutting a workpiece ( 10 ) with a laser beam (LS), in particular with a laser beam (LS) of a CO 2 laser, with a cutting head ( 2 ) from which the laser beam (LS) to the workpiece ( 10 ), and a focusing device ( 12 ) for focusing the laser beam and a folding mirror arrangement ( 14 . 20 ) for guiding the focused laser beam (LS). Einrichtung nach Anspruch 1, bei der im Schneidkopf eine der Fokussiereinrichtung (14) in Ausbreitungsrichtung des Laserstrahls (LS) nachgeordnete Faltspiegelanordnung (14, 20) angeordnet ist.Device according to Claim 1, in which one of the focusing devices ( 14 ) in the propagation direction of the laser beam (LS) downstream folding mirror arrangement ( 14 . 20 ) is arranged. Einrichtung nach Anspruch 2, bei der die Faltspiegelanordnung wenigstens einen ersten und einen zweiten Faltspiegel (14, 20) enthält, die eine spitzwinklige Z-Faltung des Laserstrahls (LS) bewirken.Device according to claim 2, in which the folding mirror arrangement comprises at least a first and a second folding mirror ( 14 . 20 ), which cause an acute-angled Z-fold of the laser beam (LS).
DE202006003424U 2006-03-04 2006-03-04 Mechanism for workpiece cutting by carbon dioxide (CO2) laser beam, with cutter head for laser beam emission, with laser beam focussing device Expired - Lifetime DE202006003424U1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106695132B (en) * 2016-12-27 2018-09-21 大族激光科技产业集团股份有限公司 Laser head assembly

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106695132B (en) * 2016-12-27 2018-09-21 大族激光科技产业集团股份有限公司 Laser head assembly

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