WO2018007344A2 - Dispositif pour introduire une optique dans le trajet optique d'une tête d'usinage laser et tête d'usinage laser pourvue de ce dispositif - Google Patents

Dispositif pour introduire une optique dans le trajet optique d'une tête d'usinage laser et tête d'usinage laser pourvue de ce dispositif Download PDF

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Publication number
WO2018007344A2
WO2018007344A2 PCT/EP2017/066553 EP2017066553W WO2018007344A2 WO 2018007344 A2 WO2018007344 A2 WO 2018007344A2 EP 2017066553 W EP2017066553 W EP 2017066553W WO 2018007344 A2 WO2018007344 A2 WO 2018007344A2
Authority
WO
WIPO (PCT)
Prior art keywords
optics
laser
optic
optical axis
processing head
Prior art date
Application number
PCT/EP2017/066553
Other languages
German (de)
English (en)
Other versions
WO2018007344A3 (fr
Inventor
Andreas Rudolf
Georg Spörl
Fabian Becker
Original Assignee
Precitec Gmbh & Co. Kg
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Precitec Gmbh & Co. Kg filed Critical Precitec Gmbh & Co. Kg
Priority to EP17737530.0A priority Critical patent/EP3478443A2/fr
Priority to CN201780048686.3A priority patent/CN109562488B/zh
Publication of WO2018007344A2 publication Critical patent/WO2018007344A2/fr
Publication of WO2018007344A3 publication Critical patent/WO2018007344A3/fr

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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
    • B23K26/02—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
    • B23K26/04—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
    • B23K26/70—Auxiliary operations or equipment
    • B23K26/702—Auxiliary equipment
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/003—Alignment of optical elements
    • G02B7/005—Motorised alignment
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
    • G02B27/0927—Systems for changing the beam intensity distribution, e.g. Gaussian to top-hat

Definitions

  • the invention relates to a device for introducing an optic, e.g. a beam shaping optics, in the beam path of a laser processing head and a laser processing head with the same.
  • laser processing head means a device for material processing by means of a laser beam, preferably for laser cutting or cutting.
  • the laser beam exiting from a laser light source for example the end of a laser fiber
  • a laser light source for example the end of a laser fiber
  • the diameter of the focus that is to say the diameter of the image of the laser light source on the workpiece, then results from the optical data of the individual optical elements of the beam guiding and focusing optics. If a laser processing head with collimator optics and focusing optics is used by default, the laser light being supplied via an optical fiber, then the focal diameter results from the product of fiber core diameter and focusing focal length divided by the collimation focal length.
  • a focus diameter of about 125 ⁇ is used up to a plate thickness of 5 mm, while cutting 5 mm to 10 mm thick sheets twice as large focus diameter, ie a focus diameter of about 250 ⁇ is desired.
  • guiding and focusing optics are used which provide a focus diameter of about 600 ⁇ m.
  • it may be advantageous to form a ring profile of the intensity distribution in the focus since this results in a more homogeneous temperature distribution in the kerf.
  • Beam shaping optics designate one or more optics to match a laser beam characteristic (for example a power density distribution, a focus diameter and / or a shape of a laser beam) to the thickness of the workpiece to be machined (thin / thick sheet), to the material of the workpiece (aluminum , Stainless steel, structural steel, ...) or to a process step (grooving, contour, labeling, ).
  • a laser beam characteristic for example a power density distribution, a focus diameter and / or a shape of a laser beam
  • a laser processing apparatus in which the beam diameter and Rayleigh length of a laser beam can be changed by selectively introducing different Kollimationslinsen in the beam path.
  • the collimating lenses received in a lens holder can be moved by a switching unit either linearly perpendicular to the optical axis or rotating with a rotation axis parallel to the optical axis in or out of the laser beam.
  • optics in particular beam-forming optics
  • the laser beam must be turned off to avoid uncontrolled reflections of the laser beam on the socket and laser safety of the staff and life of the laser processing head to guaran costs.
  • the laser beam characteristic is not immediately constant after switching on the laser emission, so that a certain waiting time after switching on may be necessary.
  • the required interruption of the laser emission during the insertion or removal of the optics has a negative effect on the processing time and complicates the process control.
  • the invention has for its object to provide a device for selectively introducing an optics (in particular a beam shaping optics, eg for forming a ring profile in focus) in a beam path of a laser processing head, and a device for material processing by means of a laser beam (in particular for laser cutting, for example a laser processing head) with the same, wherein the device allows rapid switching on and off of the optics in the laser beam or a rapid adaptation of a laser beam characteristic while ensuring laser safety and compact design.
  • an optics in particular a beam shaping optics, eg for forming a ring profile in focus
  • a laser beam in particular for laser cutting, for example a laser processing head
  • the invention is based on the idea of using a movement unit with a drive element and a coupling element between the optics and the drive element in order to move the optics into and out of the beam path.
  • an apparatus for selectively introducing optics into a beam path of a laser processing head comprises optics, e.g. a beam shaping optics, and a moving unit for moving the optics.
  • the movement unit is preferably designed to move the optics from a first position outside the beam path to a second position in the beam path, and / or vice versa from the second position to the first position.
  • the first position of the optics are outside the optical axis of the device (or the laser processing head) and the second position of the optics on the optical axis.
  • the optical axis of the device corresponds to the optical axis of the laser processing head when the device is mounted in the laser processing head.
  • the movement unit may comprise a drive element and a coupling element, wherein the coupling element is adapted to couple the optics with the drive element.
  • the device may further comprise a socket for holding the optic.
  • the movement unit may be attached to the socket.
  • the frame can be designed to be the optics surround only partially except for an open peripheral area.
  • the open peripheral region can be designed so that the laser beam when moving the optics in the laser beam (exclusively or predominantly) traverses the open peripheral region.
  • the laser beam does not hit the socket during insertion or removal of the optics, so that no laser reflections are produced on the socket.
  • the open circumferential region can correspond to at least one diameter of the laser beam passing through the optics. More specifically, a length of the chord formed by the open peripheral portion may be greater than or equal to the laser beam diameter, i. if the optic is introduced into a collimated beam, greater than or equal to the diameter of the collimated laser beam. In this way, the optics can be removed from the beam path or inserted therein, without having to interrupt the laser emission, since there is no risk of uncontrolled reflexes on the socket.
  • the socket can be formed along a circular sector on the circumference with an opening angle or center angle of less than 360 °, for example less than 270 ° or 180 °.
  • the optics can also be rectangular, in particular square, shaped, wherein the socket is formed along part of the circumference of the optics.
  • the socket surrounds the circumference of the optics at least half, ie corresponding to a center angle of 180 °.
  • the drive element can be operated manually, and, for example, a screw or the like. include. The drive element may alternatively be operated automatically.
  • the drive element may include at least one of the following elements: a motor, eg a rotary motor and / or a linear motor, a piezo, a pneumatic cylinder, an electric cylinder and a magnetic cylinder.
  • the moving unit may be adapted to pivot the optic about an axis of rotation that is in a plane perpendicular to the optical axis of the device or laser processing head.
  • an optical surface of the optical system, through which optical beams are to pass can have a surface normal, which, as it moves from the first position to the second position, is moved from a perpendicular orientation to the optical axis into a parallel alignment with the optical axis.
  • the motion unit may also be adapted to pivot the optic about an axis of rotation that is parallel to the optical axis of the device or laser processing head. That is, the moving unit may be configured to rotate the optics in a plane that is perpendicular to the optical axis. The optics can thus be moved along a circumference in the plane perpendicular to the optical axis. Here, the surface normal of the optical surface of the optics can be aligned both in the first position and in the second position parallel to the optical axis. Furthermore, the movement unit can be designed to move the optics linearly in a plane which is perpendicular to the optical axis. Here, the movement unit can push or pull the optics in the beam path or out of these.
  • the movement unit may comprise an axle or a shaft, which is fastened to the socket of the optics and about which the optic is pivotable.
  • the axle is preferably at one end with a drive element, e.g. a rotary motor, connected. At the other end, the axle may be mounted in a guide element, such as a pivot bearing.
  • the movement unit may comprise a first and a second knee or scissor lever.
  • the first toggle may be between a motor, e.g. a rotary motor, and the second toggle be arranged.
  • the second toggle can be connected to the socket of the optics.
  • the knee levers may be arranged in a plane perpendicular ("horizontal toggle lever arrangement") or in a plane parallel to the optical axis (“vertical toggle lever arrangement").
  • the movement unit preferably comprises at least one guide element for guiding the movement of the optics.
  • the guide element may be coupled to the socket of the optics.
  • guide elements for example, rails, slots, Gleitrid- ments, ball guides, roller guides, cross roller guides, pivot bearings or the like can be used.
  • the guide element may be provided on one side of the optics, or on both sides, ie on opposite sides of the optics.
  • the guide element can be rectilinear, for example, parallel to a linear direction of movement, formed. As a result, a linear movement of the optics can be performed.
  • the guide element In a rotational movement of the optics, the guide element may be arranged in a plane perpendicular to the axis of rotation.
  • the guide element may be arc-shaped or curved in a plane parallel to the optical axis.
  • a pivotal movement can be generated with a rotation axis perpendicular to the optical axis.
  • the guide element may comprise a plurality of guide sections, which are arranged in a plane perpendicular to the axis of rotation. Adjacent guide sections can form an angle between 90 ° and 180 ° with each other.
  • the optics can be rotated along the guide element with an axis of rotation perpendicular to the optical axis at this angle, for example by using a vertical toggle lever arrangement.
  • the moving unit preferably includes at least one coupling element, e.g. an axle, a toggle lever pair, a shaft, a piston, a magnetic pole, a threaded spindle, a belt drive, or a cam.
  • the coupling element can connect the optics with a drive element.
  • the coupling element is connected to the socket of the optics.
  • a laser processing head for material processing by means of a laser beam which comprises a device for selectively introducing the optics, eg a beam shaping optics, into the laser beam of the laser processing head according to one of the preceding embodiments.
  • the laser processing head may further comprise a housing which surrounds the beam path of the laser processing head.
  • the device may be integrated in the laser processing head.
  • the device can be arranged in or attached to a housing of the laser processing head.
  • the device may comprise a holder, which forms part of the housing and has an opening corresponding to the beam path of the laser machining. comprises head.
  • the optics can be arranged in the holder so that it can be moved by the movement unit into the opening.
  • the absorbents comprise an absorbent coating of a housing interior of the laser processing head.
  • the absorption means are arranged in a housing of the laser processing head in the region in which a radiation reflected upon movement of the optics impinges.
  • the absorption means may be provided in a region of the housing, on which a maximum of the reflected laser radiation impinges.
  • the absorbents are disposed adjacent to the optic.
  • the laser processing head may include a cooling unit for cooling the housing (e.g., by water) to remove heat from the laser processing head due to absorption of reflected laser radiation.
  • the cooling unit can be arranged in a region of the housing in which a radiation reflected at the optics, in particular a maximum of reflected radiation impinges.
  • the cooling unit may be located near the absorbent. This is particularly advantageous when using a moving unit for moving the optics with angles not equal to 90 ° to the optical axis, e.g. when using a movement unit for rotating the optics with a rotation axis perpendicular to the opti- see axis.
  • the device for selectively introducing the optics in front of the focusing sieroptik, for example a focusing lens, in the beam path of the laser processing head is arranged.
  • the device is arranged in the collimated laser beam.
  • the optics is arranged between a collimator optics for widening the laser beam and the focusing optics.
  • FIGS. 2A to 2C optics with part-side mounting
  • FIG. 3A is a schematic side view of a device according to the invention for the selective introduction of an optical system with a rotation axis perpendicular to the optical axis (without mounting),
  • FIG. 3B is a schematic plan view of the device from FIG. 3A, FIG.
  • 3C is a schematic 3D view of the device of FIG. 3A with holder for attachment to a laser processing head
  • FIG. 3D a schematic illustration of reflections during insertion or removal of the device from FIG. 3A into or out of a beam path of a laser head
  • 3E is a graph illustrating reflection losses in a laser head during insertion or removal of the device of FIG. 3A into and out of a beam path of a laser head;
  • 3F shows a schematic side view of a device according to the invention for the selective introduction of optics with a rotation axis parallel to the optical axis
  • FIG. 4A is a schematic plan view of a device according to the invention for the selective introduction of optics in a linear movement perpendicular to the optical axis using a horizontal toggle lever assembly
  • Fig. 4B is a schematic plan view of a device according to the invention for selectively introducing an optic in a linear movement perpendicular to the optical axis using a vertical toggle assembly
  • 5A shows a schematic side view of a guide element of a device according to the invention with two guide sections for the selective introduction of an optic with a rotation axis perpendicular to the optical axis
  • 5B shows a schematic side view of a curved guide element of a device according to the invention for the selective introduction of optics with a rotation axis perpendicular to the optical axis
  • FIG. 6 is a schematic plan view of a device according to the invention for the selective introduction of optics in a linear movement perpendicular to the optical axis using a piezo or a linear motor,
  • Fig. 7A is a schematic plan view of a device according to the invention for selectively introducing optics in a linear motion perpendicular to the optical axis using a pneumatic or electric cylinder
  • Fig. 7B is a schematic plan view of a device according to the invention for selectively introducing an optic in a linear motion perpendicular to optical axis using a magnetic cylinder
  • FIG. 8 shows a schematic plan view of a device according to the invention for the selective introduction of optics in a linear movement perpendicular to the optical axis using a threaded spindle
  • Fig. 9 is a schematic plan view of a device according to the invention for selectively introducing an optic in a linear movement perpendicular to the optical axis using a tape drive, and
  • FIG. 10 is a schematic plan view of a device according to the invention for the selective introduction of optics in a linear movement perpendicular to the optical axis using a cam.
  • FIG. 1 shows a device 100 for selectively introducing an optical system 10 into the beam path of a laser processing head in a built-in state in the laser processing head.
  • the apparatus 100 is disposed in the collimated laser beam 14 between a collimator optics 17 and a focusing lens 15.
  • a divergent laser beam emerging from an optical fiber 16 is converted by the collimator optical system 17 into a parallel or collimated laser beam 14, which is focused by the focusing lens 15 onto a workpiece 18.
  • the device 100 with the optics 10 can also be arranged in the beam path behind the focusing lens 15.
  • the device 100 can also be arranged in the divergent or convergent laser beam.
  • the device 100 comprises an optic 10, such as a beam-shaping optics, for example a lens, a lens group, a lens array, a homogenizer, a diffractive optical element, an axicon, an axicon array, a faceted optic and the like, and a movement unit 20, through which the Optics 10 between a first position and a second position can be moved back and forth.
  • the movement unit 20 can include a drive element 210 and optionally a coupling element 220, which couples the drive element 210 and the optics 10 together.
  • the apparatus 100 may further include a support 30 in which the optics 10 and possibly other elements of the device 100, e.g. the movement unit 20 or parts thereof, are arranged.
  • an opening 40 is formed, which defines a beam path of the device.
  • An optical axis OA or a beam path of the device 100 preferably passes through a center of the opening 40.
  • the beam path of the device corresponds to the beam path of the laser processing head, i. the laser beam passes through the opening 40.
  • the optical axis OA of the device 100 corresponds to the optical axis of the laser processing head.
  • the holder 30 may further comprise attachment means for attaching the device to a housing of the laser processing head such that the optical axes of the device and the laser processing head are aligned with each other.
  • the optical system 10 can be movably mounted in the laser processing head by the device 100, so that, for example, beam shaping of the intensity profile in the focal plane can optionally be switched on and off.
  • the optics 10 as shown in Figures 2A to 2C, a socket 12 which surrounds only a portion of a circumference 11 of the optical system 10 and a free or open peripheral area I Ia spared.
  • the socket 12 of the optical system 10 is thus formed only partially along a circumference 11 of the optical system 10.
  • the socket 12 is formed on one side along the circumference 11 of the optical system 10.
  • the optic 10 may consist of a substrate of any shape, and for example have a circular, oval, rectangular, square, triangular or polygonal circumference 11.
  • the socket 12 may be formed, for example, along a circular sector with a center angle of ⁇ 360 °.
  • the resulting free or open peripheral region I Ia is preferably at least as wide as the laser beam at the position where the optic 10 is introduced into the laser beam, ie as wide as the collimated laser beam 14 in the example shown in FIG.
  • the optics 10 can be removed from the beam path or inserted therein, without having to interrupt the laser emission. For there is no danger of uncontrolled reflections on the version 12. Even if the laser beam illuminates those edge surfaces of the optics 10, which do not belong to the so-called Clear Aperture, provide any backflashes for modern high-power laser sources still no danger. Also, there is little danger to damage the optic 10 when the laser beam is moved across the edge of the optic 10 because the optic 10 is preferably made of high power laser-grade glass. In particular, the optics 10 should be able to be moved into and out of the laser beam at a sufficiently high speed, so that the interaction duration with the laser radiation is sufficiently short.
  • the optic 10 is movable perpendicular to the optical axis OA of the device 100 or of the laser processing head and can thus be pushed into the beam path, for example, by a linear movement.
  • the optics 10 can be moved into and out of the beam path parallel or perpendicular to the optical axis OA by rotation with a rotation axis.
  • the optics 10 may be manually or automatically operated, eg operated by a motor.
  • FIGS. 3 to 10 show exemplary embodiments of a device 100 according to the invention for selectively introducing the optics 10 in a beam path of the device 100.
  • the socket 30 is mostly not shown.
  • the open peripheral region 11a of the optical system 10 is in this case designed in the direction of movement, so that the laser beam passes during insertion or removal of the optical system 10 through the open peripheral region 11a.
  • the device 100 according to FIGS. 3A to 3C is designed to rotate the optics 10 with an axis of rotation perpendicular to the optical axis OA of the device 100, preferably by an angle of> 90 °.
  • FIG. 3A shows a schematic side view, wherein the optics 10 is moved from a first position A outside the beam path (dashed lines) to a second position B in the beam path or on the optical axis OA.
  • An axle or shaft 221 is attached to the socket 12 of the optic 10, around which the optic 10 can be turned or tilted.
  • the axis 221 extends perpendicular to the optical axis OA of the device 100.
  • Fig. 3B is a plan view of this arrangement is shown.
  • the axle 221 is connected at one end to a drive element 210, for example a rotary motor.
  • the rotary motor can be realized with an additional gear.
  • the axis 221 thus acts as a coupling element 220 in this embodiment.
  • the axle 221 may be mounted in a guide member 230, such as a pivot bearing.
  • the optics 10 is pivoted in the direction of the curved arrow.
  • guide elements 230 or pivot bearings can also be used on both sides of the axis 221.
  • the second guide element 230 may in this case be arranged between the axis 221 and the drive element 210.
  • the device 100 is shown in perspective, wherein a holder 30 is shown.
  • the holder 30 has fastening means 31 which serve for fastening the device to the laser processing head.
  • the holder 30 is open on one side and has on an opposite side an opening 40 through which the optical axis OA of the device leads.
  • the device 100 shown in Figures 3A to 3C is particularly advantageous because of the small horizontal space requirement.
  • This embodiment with a folding mechanism is characterized by a short duration of the switching operation between the first position A and the second position B, a compact and lightweight construction, low wear and low cost.
  • an optic e.g. a beam-forming optics, provided with an anti-reflective coating.
  • Such coatings are never perfect and have some residual ref ectivity, typically ⁇ 0.5 in the specified wavelength and incident angle range. If the optic is positioned in the collimated beam, optics 10 with a reflectivity optimized for small angles of about 0 ° can be selected.
  • the optic 10 When inserted, the optic 10 produces a back reflection along the optical axis OA, i. towards the optical fiber 16.
  • This reflex represents i.d.R. No risk to the fiber or the laser.
  • the optical system 10 is folded during the removal / insertion, the reflex hits internal parts or the inner wall of the housing of the laser processing head.
  • FIG. 3E shows a graphic representation of the reflection losses as a function of the folding angle. As the angle of incidence increases with the folding angle, the reflectivity of the anti-reflection coating also increases when it is optimized for small angles of 0 °.
  • the reflection surface of the optics also drops, starting from a certain angle of tilt, in FIG. 3D starting at approximately 40 °. Consequently, there is an angle at which a maximum of the reflected power is achieved.
  • the maximum of the reflected power is achieved in the example shown in FIGS. 3D and 3E at a folding angle of approximately 65 °. The maximum losses are therefore about 11%.
  • absorption means for absorbing the reflected radiation are preferably placed in the head, for example in that region where the power maximum impinges. This can For example, by an absorbent coating the inside of the housing of the laser processing head done. The reflected power is thus efficiently converted into a warming of the housing. In order to dissipate this heat from the head, it is also possible to cool (for example through water) the housing, which in particular circulates close to the absorption medium.
  • the axis of rotation may be parallel to the optical axis, so that the optics 10 are pivoted by the moving unit 20 into the beam path can, as shown in Figure 3F.
  • FIGS. 4A and 4B show devices 100 in which the optics 10 can be displaced by a toggle lever arrangement in a rectilinear translatory movement perpendicular to the optical axis OA.
  • a so-called horizontal toggle lever arrangement is shown, in which a first toggle lever 222 and a second toggle lever 223 are arranged in a plane perpendicular to the optical axis OA or in a plane parallel to the direction of movement.
  • the first toggle lever 222 is connected at its first end to a drive element 210, eg a rotary motor, and at its second end to a first end of the second toggle lever 223.
  • the second end of the second toggle lever 223 is connected to the optic 10 and to the socket 12 connected.
  • a rectilinear guide member 230 is provided, such as a cross roller guide. If the first toggle lever 222 is now rotated by the drive element 210, the rotation is transmitted to the optics 10 via the second toggle lever and converted into a straight-line movement by the at least one guide element 230.
  • 4B shows a so-called vertical toggle lever arrangement in which a first toggle lever 222 and a second toggle lever 223 are arranged in a plane parallel to the optical axis OA or in a plane perpendicular to the direction of movement.
  • the first toggle lever 22 is connected at its first end to a drive element 210, such as a rotary motor, and at its second end to a first end of the second bell crank 223.
  • the second toggle 223 is in turn at its second end connected to the optics 10 and the socket 12.
  • a guide member 230 may be provided on one side or on both sides of the socket 12 to guide a straight line movement, such as a cross roller guide.
  • This embodiment with a vertical toggle assembly (see FIG. 4B), particularly in combination with the guide according to the embodiments shown in FIG. 5A or 5B, is compact in terms of a short duration of the switching operation between the first position A and the second position B. and lightweight construction and due to low wear and low costs.
  • FIGS. 5A and 5B show a further exemplary embodiment of a device 100 in which the optical system 10 can be moved back and forth with an axis of rotation perpendicular to the optical axis OA between the first position A and the second position B.
  • the movement unit 20 itself is not shown, but only the guide element 230 and the optics 10.
  • the embodiments shown in FIGS. 5A and 5B may be combined with one of the knee lever arrangements described above, preferably with the vertical toggle lever arrangement of FIG. 4B.
  • FIG. 5A shows a side view of the movement of the optic 10 along an L-shaped guide element 230.
  • the guide element 230 consists of a first guide section 321 and a second guide section 232 arranged perpendicular thereto.
  • the two guide sections 231 and 232 do not have to be arranged perpendicular to one another, but can form an angle between 90 ° and 180 °, for example.
  • Such a guide element 230 may be arranged on one side or on two opposite sides of the optics 10 in order to guide the optics 10 safely.
  • Fig. 5B an alternative embodiment of the guide member 230 is shown.
  • the guide member 230 is here arcuate or curved to guide the optics 10 along this curvature.
  • the devices shown in FIGS. 5A and 5B can convert a linear movement into a rotational movement of the optics 10.
  • the Volume which is crossed during the movement, minimized compared to the embodiment shown in Figures 3A to 3C. Therefore, other components of the laser processing head may be positioned closer to the optic 10.
  • the drive element 210 can be positioned to save space next to or below the parked in position A optics 10.
  • an air resistance or an air swirl during the switching operation is reduced.
  • a direct drive device 100 in which the optics 10 by means of a piezo motor with linear motor along a shaft 224, which is anchored in the holder 30 (not shown in Fig. 6), in a rectilinear translational motion perpendicular to optical axis is shifted.
  • a guide member 230 may be provided, such as a cross roller guide.
  • FIG. 7A is a similar arrangement as shown in Fig. 6, but with a pneumatic or electric cylinder with a linear motor as the drive element 210, the optics 10 via a piston 225 as a coupling element 220 with a rectilinear motion perpendicular to the opti- see axis OA out and moved here.
  • FIG. 7B shows a further embodiment in which a rotary motor is used as drive element 210 and a magnetic cylinder 229a with magnetic pole slide 229b is used as coupling element 220.
  • the magnetic cylinder 229a is rotated by the motor, and due to the pole change, the magnetic pole slide 229b attached to the optical system 10 is displaced together with the optical system 10.
  • a guide member 230 may be provided as a cross roller guide.
  • FIG. 8 shows a device 100 in which the optics 10 are moved in a linear translatory motion perpendicular to the optical axis OA by means of a threaded spindle 226 as a coupling element 220 and a rotary motor as a drive element 210.
  • a threaded spindle 226 as a coupling element 220
  • a rotary motor as a drive element 210.
  • the optics 10 By rotation of the threaded spindle 226, the optics 10 along a rectilinear guide member 230, such as a cross roller guide, out.
  • a device 100 is shown in which the optics 10 is moved by means of a tape drive.
  • a rotational movement of a rotary motor 210 is converted into a translatory movement by a belt 227b fastened to a roller 227a, so that the optical system 10 is pushed into or out of the beam path in a rectilinear motion perpendicular to the optical axis.
  • the band 227b winds up and down on the roller 227a coupled to the motor 210, whereby the rotational movement of the motor 210 is converted into a rectilinear movement of the optic 10 (see also patent application DE 10 2014 101 477).
  • the socket 12 can be guided in a guide element 230, such as a cross roller guide.
  • a device 100 is shown in which a rotational movement of the drive element 210 is converted by means of a cam 228a and guide members 230 provided on both sides in a rectilinear movement of the optics 10 perpendicular to the optical axis OA.
  • a mounted on the socket 12 spring element 228b may be arranged so that it ensures a backward movement of the cam 228a outward movement of the optics 10 from the beam path.
  • the invention therefore provides a device for introducing an optical system into a beam path of a laser processing head, which enables safe switching during high-power laser emission, fast switching times, low abrasion, compact design and low weight. Due to the short switching time, high clock speeds are possible, ensuring laser safety and continuous operation / lifetime of the head.
  • the use of optics is optional, automated, fast and safe, so that the user can adjust the laser beam characteristics as needed, and can switch and program the switching electronically.

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

Abstract

L'invention concerne un dispositif pour introduire sélectivement une optique (10) dans un faisceau laser d'une tête d'usinage laser, ce dispositif comprenant : une optique (10) et une unité de déplacement (20) pour déplacer l'optique (10), cette unité de déplacement (20) comprenant un élément d'entraînement (210) et au moins un élément d'accouplement (220) destiné à accoupler l'optique (10) à l'élément d'entraînement (210).
PCT/EP2017/066553 2016-07-04 2017-07-04 Dispositif pour introduire une optique dans le trajet optique d'une tête d'usinage laser et tête d'usinage laser pourvue de ce dispositif WO2018007344A2 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP17737530.0A EP3478443A2 (fr) 2016-07-04 2017-07-04 Dispositif pour introduire une optique dans le trajet optique d'une tête d'usinage laser et tête d'usinage laser pourvue de ce dispositif
CN201780048686.3A CN109562488B (zh) 2016-07-04 2017-07-04 一种用于借助激光束进行材料加工的激光加工头

Applications Claiming Priority (2)

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DE102016112176.2 2016-07-04
DE102016112176.2A DE102016112176B4 (de) 2016-07-04 2016-07-04 Vorrichtung zum selektiven Einführen einer Optik in einen Laserstrahl eines Laserbearbeitungskopfes und Laserbearbeitungskopf mit derselben

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WO2018007344A2 true WO2018007344A2 (fr) 2018-01-11
WO2018007344A3 WO2018007344A3 (fr) 2018-03-01

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CN (1) CN109562488B (fr)
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DE102018131889B4 (de) * 2018-09-27 2021-08-12 Scansonic Mi Gmbh Laserstrahljustiervorrichtung
DE102019112167A1 (de) * 2019-05-09 2020-11-12 Trumpf Laser Gmbh Bearbeitungskopf zur Führung eines Laserstrahls sowie Laserbearbeitungsvorrichtung mit einem Bearbeitungskopf
TWI794589B (zh) * 2020-02-21 2023-03-01 海納光電股份有限公司 硬脆板材高溫環境加工裝置及方法
DE102021113267A1 (de) 2021-05-21 2022-11-24 Precitec Gmbh & Co. Kg Laserbearbeitungskopf und Verfahren zur Herstellung eines Laserbearbeitungskopfes
CN113977072B (zh) * 2021-11-30 2022-10-18 广东宏石激光技术股份有限公司 一种基于可变光斑衍射元件的变焦激光加工系统及方法

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EP3478443A2 (fr) 2019-05-08
WO2018007344A3 (fr) 2018-03-01
DE102016112176B4 (de) 2021-08-12
CN109562488B (zh) 2022-01-14
CN109562488A (zh) 2019-04-02

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