WO2023006611A1 - Procédé de découpe au laser d'une pièce, avec un minimum d'intensité étendu sur l'épaisseur de la pièce, au centre du profil d'intensité du faisceau laser - Google Patents

Procédé de découpe au laser d'une pièce, avec un minimum d'intensité étendu sur l'épaisseur de la pièce, au centre du profil d'intensité du faisceau laser Download PDF

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Publication number
WO2023006611A1
WO2023006611A1 PCT/EP2022/070634 EP2022070634W WO2023006611A1 WO 2023006611 A1 WO2023006611 A1 WO 2023006611A1 EP 2022070634 W EP2022070634 W EP 2022070634W WO 2023006611 A1 WO2023006611 A1 WO 2023006611A1
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WO
WIPO (PCT)
Prior art keywords
laser
workpiece
laser beam
intensity
local
Prior art date
Application number
PCT/EP2022/070634
Other languages
German (de)
English (en)
Inventor
Johannes SEEBACH
Timo WEINGÄRTNER
Nicolai Speker
Original Assignee
Trumpf Laser- Und Systemtechnik Gmbh
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 Trumpf Laser- Und Systemtechnik Gmbh filed Critical Trumpf Laser- Und Systemtechnik Gmbh
Publication of WO2023006611A1 publication Critical patent/WO2023006611A1/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
    • B23K26/36—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
    • B23K26/062—Shaping the laser beam, e.g. by masks or multi-focusing by direct control of the laser beam
    • B23K26/0622—Shaping the laser beam, e.g. by masks or multi-focusing by direct control of the laser beam by shaping pulses
    • 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
    • B23K26/062—Shaping the laser beam, e.g. by masks or multi-focusing by direct control of the laser beam
    • B23K26/0626—Energy control of 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
    • B23K26/06—Shaping the laser beam, e.g. by masks or multi-focusing
    • B23K26/073—Shaping the laser spot
    • B23K26/0734—Shaping the laser spot into an annular shape
    • 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
    • B23K2103/00—Materials to be soldered, welded or cut
    • B23K2103/08—Non-ferrous metals or alloys
    • B23K2103/14—Titanium or alloys thereof

Definitions

  • Solid materials can be severed in a variety of ways, such as punching or sawing.
  • laser cutting also known as laser beam cutting
  • a focused laser beam and a gas stream of a cutting gas are directed onto the workpiece and moved along a desired cutting contour relative to the workpiece.
  • Laser beams used in workpiece processing usually have an approximately Gaussian beam profile, which has a maximum intensity in a center, which gradually decreases towards the outside. Appropriate beam profiles are easy to generate in the fundamental mode of a laser resonator.
  • the quality of the generated cutting edge of the workpiece is of considerable importance in many applications.
  • low cut flank roughness is often desired.
  • burrs on the cutting edge should also be minimal and the heat-affected zone in the material should be small.
  • object of the invention It is an object of the invention to provide a method for laser cutting a workpiece with which an improved quality of the cutting edge can be achieved.
  • the local Laserintensi is a maximum of 60% of a maximum laser intensity in the local intensity profile.
  • the present invention provides for keeping the local laser intensity low in the center of the laser beam, preferably with a local minimum of the laser intensity being set up in the center.
  • the laser intensity is increased at a radial distance from the center, typically with some local intensity maxima arranged in a ring around the center.
  • the laser intensity is therefore relatively low in the center in the local intensity profile (measured in a plane perpendicular to the direction of beam propagation), and relatively high radially around the center, and accordingly distributed primarily radially outwards.
  • an LP p,q -mode or a combination of LP p,q -modes for the laser beam is used, typically with p>2 and q>1.
  • the laser cutting according to the invention is carried out in such a way that the intensity distribution according to the invention is not only present in a focal plane of the laser beam, but over the entire thickness D of the workpiece within the workpiece. With a given workpiece thickness D, this can be set up in particular by a suitable selection of the beam parameter product and the focus diameter of the laser beam. Thanks to the invention, a high laser intensity can be used on the cutting flanks not only around the focus, but over the entire thickness of the workpiece ("sheet thickness”) and in a wide focal position adjustment range. This can significantly reduce the roughness of the cutting flanks.
  • the absorbed intensity is azimuthally large over the entire thickness D of the workpiece, in particular larger than with a Gaussian beam.
  • the laser intensity is not only high at the cut front crest, but also at the cut flanks, over the entire depth of the cut flanks.
  • the viscosity of the melt can therefore vary everywhere in the processing area of the workpiece remain low, and the melt can be easily expelled, e.g. with the gas jet of a cutting gas. Accordingly, a low cut edge roughness and low burr formation can be achieved. A comparatively high cutting speed can also be achieved, and thus a high efficiency of the laser cutting.
  • the workpiece to be cut is preferably made of steel, in particular stainless steel, or of titanium or a titanium-containing alloy, in particular with a proportion of 50% by weight or more titanium, preferably 90% by weight or more titanium.
  • steel in particular stainless steel
  • titanium or a titanium-containing alloy in particular with a proportion of 50% by weight or more titanium, preferably 90% by weight or more titanium.
  • the workpiece to be cut can also advantageously consist of aluminum or an aluminum-containing alloy, in particular with a proportion of 50% by weight or more aluminum, preferably 90% by weight or more aluminum.
  • Al materials a significant reduction in the roughness of the cut flanks and a significant increase in the cutting speed, especially with thin workpieces (D ⁇ 2mm), can be achieved compared to laser cutting with a conventional Gaussian laser beam.
  • a typical total laser power of the laser beam is typically 2 kW or more, preferably from 2 kW to 3 kW.
  • a laser source with a wavelength that is fiber-deliverable is preferred for the invention.
  • the laser source is preferably between different modes or mode combinations, and thus different intensity profiles, can be switched over without changing components.
  • a variant of the method according to the invention is preferred which provides that within the workpiece over the entire thickness D of the workpiece for each local intensity profile of the laser beam in cross section perpendicular to the beam propagation direction of the laser beam:
  • the local laser intensity is a maximum of 50%, preferably a maximum of 25%, of the maximum laser intensity in the local intensity profile.
  • the distribution of the laser intensity is even more pronounced radially outwards, which means that in many cases a further improvement in the roughness of the cut flanks can be achieved.
  • a variant of the method is also preferred in which the following applies to a focus diameter FKD of the laser beam:
  • the laser cutting according to the invention can be carried out well in practice.
  • a small focus diameter, together with a low beam parameter product, also enables narrow cutting gaps and thus a particularly efficient cutting process.
  • the focus diameter is determined in relation to the beam propagation direction at the point where the laser beam (focused by the laser optics) has its narrowest point (waist).
  • This waist typically lies within the workpiece to be cut with respect to the beam propagation direction, particularly for fusion cutting; however, the waist may alternatively be above or below the workpiece.
  • the focal diameter is measured perpendicular to the beam propagation direction (in the focal plane).
  • the focus diameter can be determined according to the 86% criterion, ie a circular area is placed around the center of the intensity profile at the waist of the laser beam with a diameter such that 86% of the laser power lies within the circular area. Also preferred is a variant in which the following applies to a beam parameter product SPP of the laser beam:
  • SPP ⁇ 3.6 mm*mrad preferably SPP ⁇ 2.4 mm*mrad, particularly preferably SPP ⁇ 2.1 mm*mrad.
  • the method according to the invention can thus be easily implemented in practice for typical focus diameters and typical workpiece thicknesses.
  • a variant is particularly preferred in which the following applies to the thickness D of the workpiece: 0.5 mm ⁇ D ⁇ 4.0 mm.
  • These workpiece thicknesses can be machined well within the scope of the inventions with low cutting flank roughness. It should be noted that for larger workpiece thicknesses (e.g. with D>2mm) higher laser modes are preferred, e.g. with azimuthal mode number p>4, and vice versa for smaller workpiece thicknesses (e.g. with D ⁇ 2mm) lower laser modes can also be used (e.g. with p ⁇ 3).
  • a variant is also particularly preferred in which the following applies to the thickness D of the workpiece: D ⁇ 1.0 mm.
  • Such workpieces can be manufactured with particularly good quality, even in the case of filigree contours to be cut.
  • the laser source to be connected to the laser optics via a fiber optic cable with a fiber diameter FD, where FD ⁇ 55 pm
  • the laser optics include a collimation device with a focal length fc , which consists of a fiber end of the fiber optic cable exiting laser beam generates a collimated laser beam
  • the laser optics comprise a focusing device with a focal length fo, which focuses the collimated laser beam in the direction of the workpiece, where 37.5mm ⁇ f c ⁇ 200mm and 150mm ⁇ fo ⁇ 200mm.
  • the laser beam has a beam diameter SD, and SD/DK>1.0, preferably SD/DK>1.2, particularly preferably 1.25 ⁇ SD/DK ⁇ 1.6.
  • the laser beam is noticeably extended over the annulus of the local maxima, and accordingly the laser intensity increases from radially outwards to the annulus of the local maxima with a rather low gradient, especially in the workpiece above and below the focal plane. This has proven to be advantageous for the cutting quality.
  • the beam diameter SD in the respective local intensity profile can be determined according to the 86% criterion, i.e. a circular area is placed around the center of the local intensity profile of the laser beam with a diameter such that 86% of the laser power lies within the circular area.
  • the pulsed laser source can be used to set up a fine groove structure on the cut flanks, which results in a particularly low (average) cut flank roughness.
  • a variant is also preferred in which the following still applies within the workpiece over the entire thickness D of the workpiece for each local intensity profile of the laser beam in cross section perpendicular to the beam propagation direction of the laser beam:
  • the local laser intensity is at most 60% of a maximum laser intensity in the local intensity profile, the central area occupying an area of at least 10% of the cross-sectional area of the laser beam in the local intensity profile. This causes a pronounced concentration of the laser intensity radially outwards, away from the central axis of the laser beam in the area of the cutting flanks, which improves the cutting quality.
  • the local laser intensity in the central area is preferably at most 50% of the maximum laser intensity in the local intensity profile, and/or the central area occupies an area of at least 15% of the cross-sectional area of the laser beam.
  • the cross-sectional area of the laser beam in the local intensity profile can be determined as a circular area around the center with the 86% criterion, i.e. the diameter results in such a way that 86% of the laser power lies in the associated circular area.
  • a variant is also preferred in which the laser cutting takes place with a cutting gap geometry in the manner of a Laval contour. This achieves an optimum flow of cutting gas and, in turn, improved melt detachment.
  • the scope of the present invention also includes a laser cutting system, comprising a laser source, laser optics and at least one workpiece to be cut, set up to carry out the method according to the invention and described above.
  • a laser cutting system comprising a laser source, laser optics and at least one workpiece to be cut, set up to carry out the method according to the invention and described above.
  • the workpiece can be manufactured with particularly good cutting quality, in particular particularly low roughness of the cut flanks.
  • a particularly low (average) cut flank roughness Ra can be achieved. This is particularly valued and required in aerospace engineering, particularly in order to achieve high fatigue strength and fatigue strength in laser-processed components. Due to the low roughness, the notch effect of the components is reduced.
  • the (average) cut flank roughness Ra is typically measured as follows:
  • the directions x, y and z are perpendicular to each other.
  • the positions i 1...5 are at 10%, 30%,
  • FIG. 2 shows an example of a laser cutting system during laser cutting of a workpiece according to the invention
  • FIG. 2 illustrates local intensity distributions of the laser beam from FIG. 1 on the upper side of the workpiece, in the focal plane and on the underside of the workpiece;
  • FIG. 3 illustrates the intensity distribution in the xz section for a laser beam in the laser cutting system of FIG. 1 in the focal plane, for different laser modes
  • FIG. 4 illustrates the intensity distribution in the xz section for a laser beam in the laser cutting system of FIG. 1 in the focal plane in laser mode LP3 with further details; 5 shows light-optical images of a cut flank (top) produced with a conventional, Gaussian beam and a cut flank (bottom) produced with the method according to the invention (bottom) for a titanium workpiece in comparison.
  • FIG. 1 shows an exemplary embodiment of a laser cutting system 1 according to the invention when carrying out an exemplary variant of the method according to the invention for laser cutting a workpiece 2.
  • a schematic cross section is shown which goes through the workpiece 2 at the cutting gap 12.
  • the laser cutting system 1 comprises a laser source 3, which can be designed with a disk laser, for example, for generating a laser beam 7.
  • the laser source 3 can be switched between different laser modes or combinations of laser modes.
  • clamping mechanisms can be provided in the laser source 3, such as are known, for example, from WO 2019/150071 A1 (not shown in detail).
  • the laser beam 7 provided by the laser source 3 comprises only one laser mode, namely an LP3,i mode.
  • the laser power of the laser source 3 is ge pulsed with a pulse frequency ftrain of 20 kHz; ftrain >5 kHz or also 15 kHz ⁇ ftrain ⁇ 25 kHz preferably applies.
  • the laser source 3 provides a laser beam 7 which is guided to a laser optics 5 by means of a fiber optic cable 4 .
  • the optical fiber cable 4 has a fiber diameter FD of 50 pm; typical fiber diameters FD are generally FD ⁇ 55pm; the fiber diameter FD of the fiber in which the laser beam 7 is guided is also referred to as the fiber core diameter.
  • the laser optics 5 includes a collimation device 6, here a single collimation lens 6a, with which the laser beam 7 emerging at a fiber end 4a of the fiber-optic cable 4 is collimated.
  • the collimation device 6 has a focal length f c of 100 mm here; typical focal lengths f c are in the range from 37.5 mm to 200 mm.
  • the collimated laser beam 7 is then focused by a focusing device 8, here a single focusing lens 8a, in the direction of the workpiece 2.
  • the focusing device 8 here has a focal length fo of 150 mm; typical focal lengths fo are in the range from 150 mm to 200 mm.
  • the laser beam 7 then passes through a nozzle 9 at which a gas jet 10 of a cutting gas is set up coaxially to the laser beam 9 and is accordingly also directed onto the workpiece 2 .
  • Nitrogen (N2) is used as the cutting gas. 17 bar is selected here as the cutting gas pressure PS; typical cutting gas pressures SP are between 12 bar and 22 bar.
  • the workpiece 2 is a sheet metal here and has a thickness D, which is measured here in the z direction along the direction of beam propagation (which here runs in the ⁇ z direction).
  • the laser cutting takes place along a cutting contour 11 in a cutting direction (which runs here in the ⁇ x direction) relatively between the laser beam 7 and the workpiece 2, the laser beam 7 penetrating the workpiece 2 on a top side 2a of the workpiece 2 and on a bottom side 2b of the workpiece 2 emerges again.
  • a focus 15 of the laser beam 7 (relative to the z-axis), at which the laser beam 7 has its smallest extension in the xy plane ("waist"), approximately in the middle
  • the laser beam 7 liquefies the material of the workpiece 2 on a cutting front 13 to form a melt, which is expelled from the cutting gap 12 of the workpiece 2 with the aid of the gas jet 10 . Most of the melt leaves the cutting gap 12 as expelled melt beads 14; a smaller part of the melt remains on the underside 2b of the workpiece at the edges of the cutting gap 12 and forms a burr 16 there.
  • a cutting edge 17 is produced on the workpiece 2 along the cutting gap 12 produced.
  • the laser beam 7 has transverse to the beam propagation direction within the thickness D of the workpiece 2 local intensity profiles perpendicular to the beam propagation direction (here -z-direction).
  • all of these local intensity profiles within the workpiece thickness D have in common that they have a comparatively low local laser intensity in their respective center (on the optical axis OA of the laser beam 7) and also have several local intensity maxima around the center , where the local laser intensity is much higher; Due to the laser mode LP3 selected here, there are a total of six local intensity maxima around the center, which are approximately on the corners of a regular hexagon. In this case (each in all intensity profiles within the
  • Workpiece thickness D the local laser intensity in the center is a maximum of 60% of the maximum intensity in the cross section of the entire laser beam.
  • the local intensity profiles within the workpiece thickness D have, so to speak, a “zero point” propagating over the workpiece thickness D in the center or on the optical axis OA.
  • FIG. 1 shows the local intensity profile 18a on the top side 2a of the workpiece, the local intensity profile 18b on the bottom side 2b of the workpiece and the local intensity profile 18c in the plane of the focus 15 of the laser beam 7, each with respect to the xy plane.
  • a dark color indicates a higher local laser intensity than a light color.
  • the cutting gap 12 has a geometry corresponding to a Laval contour, which makes it easier for the melt to escape. Due to the method according to the invention, in particular the local intensity profiles of the laser beam 7 within the thickness D of the workpiece 2 according to the invention and also additionally by pulsing the laser power, very fine grooves 17a and an overall low roughness Ra of the cut flanks with regard to the y-direction (the approximately perpendicular to the cutting flank 17) can be achieved.
  • the (mean) cut flank roughness Ra is usually 5 pm or less, and often 3 pm or less.
  • burrs 16 are formed, usually with a burr overhang (here in relation to the z-direction) smaller than 10% of the workpiece thickness D.
  • the heat-affected zones obtained are usually quite small, mostly less than 15% of the workpiece thickness D, and often less than 5% of the workpiece thickness D.
  • the finished cut workpiece 2 can be used as a component in an aircraft or a spacecraft (not shown in detail).
  • FIG. 2 once again illustrates in more detail the local intensity profiles 18a, 18b, 18c of the laser beam from FIG. 1 on the upper side of the workpiece (top), on the underside of the workpiece (bottom) and in the plane of the focus (middle).
  • An xz section is shown on the right in each case, in which the intensity is represented by means of the brightness, with (within the beam diameter of the laser beam shown against a dark background) darker areas representing the areas with higher intensity and lighter areas representing the areas ge lower intensity.
  • the six local intensity maxima are clearly visible; they are lined up approximately in a ring around the center with a lower local laser intensity. As a rule, there is a local minimum of the local laser intensity approximately in the center.
  • Associated intensity diagrams with intensity curves are shown on the left, which are in the xz section (through the optical axis, i.e. through the center of the laser beam and thereby approximately through two of the local intensity maxima. by) the position in the x-direction to the right and the intensity to the top (each plotted in arbitrary units).
  • the laser intensity is low in the center and in a central area around the center, and is higher on both sides of the central area, with two clear local maxima in each case.
  • FIG. 3 shows the distribution of the intensity of the laser beam in the focal plane in the xz section (through the center of the laser beam), with the position in x (here in units of pixels px) plotted to the right and the intensity plotted to the top (in arbitrary units) for laser beams in different modes.
  • the distributions are determined with the laser cutting system as shown in Fig. 1, with a 2D intensity measuring device replacing the workpiece there (e.g.
  • the intensity has a single local maximum approximately in the middle of the laser beam; the laser beam has an intensity distribution approximately corresponding to a Gaussian curve (“Gaussian laser beam”).
  • Gaussian laser beam a Gaussian curve
  • the maximum intensity has weakened by about 10%.
  • the local laser intensity at the center Z is only approx. 50% of the maximum intensity in the intensity curve 20.
  • the maximum intensity has also weakened by about 10%.
  • the local laser intensity at the center Z is only approx. 20% of the maximum intensity in the intensity curve 21.
  • the maxima in the intensity curve 21 are further apart than in the intensity curve 20.
  • the intensity in the center Z can be reduced relative to the rest of the intensity curve.
  • the diameter of a central area with low laser intensity around the center Z can be increased.
  • the higher laser mode means that the laser intensity is shifted further radially outwards.
  • FIG. 4 again shows the isolated intensity curve 20, measured in the xz section in the focal plane with a laser beam 7, which is based on an LP3,i mode (cf. already FIG. 3).
  • the cut was made through the center Z of the laser beam 7 and approximately through two local maxima.
  • the intensity curve 20 represents an example of a respective local intensity profile of the laser intensity in a cross section perpendicular to the beam propagation direction within the entire thickness D of a workpiece according to the invention.
  • the intensity or the intensity curve 20 has two local maxima at the x-positions PLMI and PLM2. These lie, together with four other local maxima (not shown in Fig. 4, but cf. e.g. Fig. 2), on a circular ring around the center Z, which has a diameter DK.
  • the laser beam 7, whose intensity curve is shown in FIG. 4, can be assigned a beam diameter SD.
  • a circle is placed within which 86% of the total intensity of the laser beam 7 lies; the diameter of this circle corresponds to SD (so-called 86% criterion).
  • approximately SD/DK 1.26; SD/DK>1 or also SD/DK>1.2 typically applies in general, and 1.25 ⁇ SD/DK ⁇ 1.6 is particularly preferred. Since the local intensity profile of Fig. 4 was recorded in the plane of the focus, SD also represents the focus diameter FKD here.
  • the laser beam 7 has its greatest intensity here at the location of the second maximum at PLM2, with an intensity of Imax LS .
  • the laser beam 7 has an intensity of I z .
  • approximately I z /Imax LS 0.50 applies; typically I z /I max LS ⁇ 0.60, preferably I z /Imax LS ⁇ 0.50, or else I z /Imax LS ⁇ 0.25 generally applies.
  • a circular central area ZB can be placed around the center Z with a diameter such that 10% of the cross-sectional area 7a of the laser beam 7 (ie 10% of the circular area belonging to the beam diameter SD) lies within the central area ZB.
  • the diameter of the central area ZB is then approximately 1/3 as large as the diameter SD of the laser beam.
  • a light-optical recording (top view) of a cutting edge of a workpiece made of titanium (material T40) is shown, which was produced with a conventional, Gaussian laser beam (top) and with a laser beam with the local intensity profiles according to the invention (as was manufactured according to Fig. 2) shown (below).
  • the manufacturing parameters were optimized for the material and the typical requirements for aerospace components. It can be seen with the naked eye that the conventionally produced cutting flank has a significantly higher roughness than the cutting flank produced according to the invention.
  • An Ra value of 3.74 ⁇ m was measured for the conventional cutting edge, and an Ra value of 1.79 ⁇ m was measured for the cutting edge produced according to the invention.
  • the burrs on the underside of the workpiece are in both cases low.
  • Imax LS maximum (local) intensity of the laser beam Imax ZB maximum (local) intensity of the laser beam in the central area Iz (local) intensity of the laser beam in the center

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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

L'invention concerne un procédé de découpe au laser d'une pièce (2), ladite pièce (2) étant formée avec une épaisseur dans une zone à découper, en particulier la pièce (2) étant conçue sous la forme d'une tôle métallique, un faisceau laser (7) étant produit dans une source laser (3), et le faisceau laser (7) étant focalisé avec une optique laser (5) en direction de la pièce (2), et le faisceau laser (7) étant composé d'un ou de plusieurs modes laser du type LP p,q, p : numéro de mode azimutal et q : numéro de mode radial, le procédé se caractérisant en ce que la découpe au laser est réalisée de telle sorte qu'à l'intérieur de la pièce (2), sur toute l'épaisseur D de la pièce (2), pour chaque profil d'intensité local (18 a-18c) du faisceau laser (7) en coupe transversale perpendiculairement à la direction de propagation du faisceau laser (7) les caractéristiques suivantes s'appliquent : - en un centre (Z) du profil d'intensité local (18a-18c), l'intensité laser locale (Iz) s'élève au maximum à 60 % d'une intensité laser maximale (Imax LS) dans le profil d'intensité local (18a-18c). L'invention concerne un procédé de découpe au laser d'une pièce permettant d'obtenir une meilleure qualité du flanc de coupe.
PCT/EP2022/070634 2021-07-29 2022-07-22 Procédé de découpe au laser d'une pièce, avec un minimum d'intensité étendu sur l'épaisseur de la pièce, au centre du profil d'intensité du faisceau laser WO2023006611A1 (fr)

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DE102021119750.3 2021-07-29
DE102021119750.3A DE102021119750A1 (de) 2021-07-29 2021-07-29 Verfahren zum Laserschneiden eines Werkstücks, mit über die Dicke des Werkstücks ausgedehntem Intensitätsminimum im Zentrum des Intensitätsprofils des Laserstrahls

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WO2019150071A1 (fr) 2018-02-02 2019-08-08 Spi Lasers Uk Limited Appareil et procédé de traitement laser d'un matériau

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