EP2373455A1 - Procédé et dispositif pour fabriquer des sections de tube en utilisant un faisceau laser mû par un dispositif de balayage; section de tube correspondante - Google Patents

Procédé et dispositif pour fabriquer des sections de tube en utilisant un faisceau laser mû par un dispositif de balayage; section de tube correspondante

Info

Publication number
EP2373455A1
EP2373455A1 EP09760460A EP09760460A EP2373455A1 EP 2373455 A1 EP2373455 A1 EP 2373455A1 EP 09760460 A EP09760460 A EP 09760460A EP 09760460 A EP09760460 A EP 09760460A EP 2373455 A1 EP2373455 A1 EP 2373455A1
Authority
EP
European Patent Office
Prior art keywords
laser beam
optical element
section
pipe
tube
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Withdrawn
Application number
EP09760460A
Other languages
German (de)
English (en)
Inventor
Werner Boltshauser
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
COSMOCAN Tech AG
Original Assignee
COSMOCAN Tech AG
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 COSMOCAN Tech AG filed Critical COSMOCAN Tech AG
Publication of EP2373455A1 publication Critical patent/EP2373455A1/fr
Withdrawn legal-status Critical Current

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
    • B23K26/06—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
    • B23K26/0652—Shaping the laser beam, e.g. by masks or multi-focusing by means of optical elements, e.g. lenses, mirrors or prisms comprising prisms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/08—Making tubes with welded or soldered seams
    • 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
    • B23K26/08—Devices involving relative movement between laser beam and workpiece
    • B23K26/082—Scanning systems, i.e. devices involving movement of the laser beam relative to the laser head
    • 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
    • B23K26/08—Devices involving relative movement between laser beam and workpiece
    • B23K26/10—Devices involving relative movement between laser beam and workpiece using a fixed support, i.e. involving moving the laser beam
    • B23K26/103—Devices involving relative movement between laser beam and workpiece using a fixed support, i.e. involving moving the laser beam the laser beam rotating around the fixed workpiece
    • 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
    • B23K26/08—Devices involving relative movement between laser beam and workpiece
    • B23K26/10—Devices involving relative movement between laser beam and workpiece using a fixed support, i.e. involving moving the laser beam
    • B23K26/103—Devices involving relative movement between laser beam and workpiece using a fixed support, i.e. involving moving the laser beam the laser beam rotating around the fixed workpiece
    • B23K26/106—Devices involving relative movement between laser beam and workpiece using a fixed support, i.e. involving moving the laser beam the laser beam rotating around the fixed workpiece inside the workpiece
    • 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
    • B23K26/20—Bonding
    • 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
    • B23K26/20—Bonding
    • B23K26/21—Bonding by welding
    • B23K26/24—Seam welding
    • B23K26/26—Seam welding of rectilinear seams
    • B23K26/262—Seam welding of rectilinear seams of longitudinal seams of tubes
    • 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
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P23/00—Machines or arrangements of machines for performing specified combinations of different metal-working operations not covered by a single other subclass
    • B23P23/06—Metal-working plant comprising a number of associated machines or apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L9/00—Rigid pipes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L9/00—Rigid pipes
    • F16L9/17—Rigid pipes obtained by bending a sheet longitudinally and connecting the edges
    • 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
    • B23K2101/00—Articles made by soldering, welding or cutting
    • B23K2101/04—Tubular or hollow articles
    • B23K2101/12—Vessels
    • B23K2101/125—Cans

Definitions

  • the invention relates to a method according to the preamble of claim 1, to a device according to the preamble of claim 13 and to pipe sections according to the preamble of claim 21.
  • a flat strip material can be continuously formed into the closed mold.
  • the two lateral edges are brought together around a longitudinal axis and connected to each other by a weld.
  • the desired pipe sections or shell sections are separated.
  • the pipe sections can be used as pipe parts or further processed to desired parts.
  • WO 2006/074570 a method is known, in which the longitudinal seam is formed as a pressed seam on a flattened emerging pipe. After forming the longitudinal seam, the resulting tube is expanded into a round cross-section and it pipe sections are separated.
  • a support edge is provided inside the tube.
  • the support edge is closed substantially circular, extending in a normal plane to the longitudinal axis of the tube and is located directly on the inside of the pipe wall.
  • This support edge is associated with a cutting tool, which is rotated during cutting along the support edge, so that a cutting area in the tube circumferential direction once along the pipe circumference rotates, thereby separating a pipe section.
  • the supporting edge and the cutting element move with the wall material.
  • Pipe sections made according to the method described above may be used as can jackets for cans, with each jacket having a longitudinal weld. The bottom and / or top are attached to the can jacket. From WO2005 / 000498 A1 embodiments of can bodies are known in which an upper end part is connected by means of laser welding to the can jacket.
  • Can bodies are to be understood as meaning all vessels, in particular aerosol cans, beverage cans but also tubes and vessel-shaped intermediate products.
  • a rapid cutting process can be used particularly advantageously in the production of can coats because there the sections are relatively short and only a short cutting cycles are possible at a high production speed.
  • the supporting edge If the supporting edge is held by the open end of the resulting tube, it must be inserted from the open side opposite to the advancing direction of the sheath band in the jacket section to be separated and moved there in the correct position with the tube. During the cutting process, the supporting edge should bear against the wall material in a position coordinated with the position of the cutting tool. After cutting, the pipe section must be pulled away from the support edge or from the part with the support edge and the support edge must be reinserted into the pipe. The movements of the supporting edge must be carried out quickly and with correspondingly large acceleration forces, so that the pipe length formed during the separation of a section is smaller than the length of the separated section.
  • Rapid separation is important if the pipe sections are to be used, for example, for can production with production throughputs of 300 to 600 cans per minute.
  • the known mechanical separation processes are complex, because relatively large masses have to be accelerated and the separation cycles can not be shortened even further.
  • WO 2008/065063 A1 describes a device for trimming the open can end of plastic cans.
  • Several cans to be trimmed are used in brackets of a turntable.
  • a scan laser is assigned to the can end to be trimmed.
  • Scanning means allow the guidance of the laser beam along a predetermined cutting path.
  • the laser beam passes over a cone surface with an axis lying on the axis of the can to be trimmed.
  • the at the cutting point relative to the can axis slightly outwardly directed laser beam achieves an adapted to the orientation of the conical surface oblique interface, which is formed edge-free or rounded due to the melting plastic.
  • This cutting method is limited to used in holders finished cans, with only the cutter facing the free end can be cut and also there the cutting surface is not substantially radially, but is aligned conically with an acute angle to the can axis.
  • US Pat. No. 6,541,732 B2 describes a laser scanning device in which the laser beam can be moved on a circular path in parallel alignment to form a bore with a cylindrical boundary.
  • WO 2007/079760 A1 describes a scanner head which provides a spatially freely orientable laser axis on a robot arm.
  • DE 10 2005 033 605 A1 describes the optics of a scanning laser with a gimbal-type scanner mirror which can be moved about two axes. To be able to set the focal point at a desired distance to the scanner mirror is a displaceable - A -
  • Concave lens provided.
  • the scanner laser is attached to a robot arm and thus brought to the desired job.
  • US Pat. No. 6,355,907 B1 describes a laser drilling device in which a plane-parallel transparent element, transparent wedge elements and a transparent dove prism are used to move the beam axis. By each specific orientation of such prism-shaped elements, the axis of the outgoing beam relative to the axis of the incoming laser beam can be offset in parallel and only slightly inclined.
  • a laser welding head for internal pipe welding comprises a deflecting mirror which deflects a laser beam fed in parallel to the tube axis radially outward.
  • the welding head is inserted into the pipe and turned around its axis at the desired location. Roller bearings with a pressing device ensure a constant focus positioning.
  • This machining head is not suitable for separating pipe sections on an emerging pipe, because in short separation cycles large acceleration forces would have to be applied and the separated pipe sections could only be taken from the welding head with further large movements.
  • the known from the prior art scanning laser would have to be moved with a robot arm to the resulting tube to perform a cut at a distance of the desired pipe section with a laser beam as possible radially aligned laser beam.
  • the robot assembly is extremely expensive to move around the pipe circumference.
  • the cutting position would have to be carried along with the resulting tube.
  • the movements of a robot arm are not suitable for the separation of pipe sections, or for a circular movement around the pipe.
  • the present invention has for its object to find a solution with a quick and easy separation of pipe sections is achieved by a continuously produced pipe.
  • a closed dividing line is formed around the section axis along the circumference of the pipe. formed, which is spaced by a section length from the free end of the tube.
  • a laser beam supplied by a laser scanning device is guided at least once around the entire circumference of the resulting pipe and thereby transversely to the section axis
  • Dividing line is directed, wherein a substantially focused contact area of the laser beam in the resulting tube in the continuous with the resulting tube dividing plane is completely guided along the closed parting line and thereby the pipe section is separated from the resulting tube.
  • a laser beam generated by a laser scanning device is guided at least once along the entire circumference of a first circularly closed around the section axis optical element, the laser beam along the entire circumference of the first annularly closed optical element always transverse to Section axis is deflected to the dividing line.
  • At least one rotatably mounted optical deflecting element is rotated about the section axis in the region of the dividing plane continuously advanced with the resulting tube, and the laser beam is deflected at least over partial regions of this rotating optical deflecting element to the dividing line transversely to the section axis.
  • a rotating optical deflection element preferably a flat mirror surface is used. It goes without saying that a focusing rotating deflection element, in particular a concave mirror surface can be used.
  • the rotating optical deflecting element can be arranged inside or outside the resulting tube.
  • the rotating optical deflecting element can be moved in the direction of the section axis or the laser beam impinging on the rotating optical deflecting element changes the orientation and / or position relative to the rotating optical Deflection element so that in combination with the rotational movement of the deflection element, the desired movement of the focused contact region of the laser beam is ensured along the parting line.
  • the focusing device is designed such that it always adapts the focal length in all variants to the corresponding beam length up to the dividing line.
  • strip-shaped flat material is fed continuously at a feed speed, transversely formed to the belt axis in a closed mold and formed with the welding of a longitudinal seam to a nem emerging pipe.
  • tube sections are separated, wherein a pipe section to be separated extends over a section length along a section axis, when separating a closed dividing line is formed around the section axis along the circumference of the pipe and the dividing line is in a continuous with the resulting tube dividing plane, which is a Section length is spaced from the free end of the pipe.
  • a laser beam generated by a laser scanning device is guided and focused so that a substantially focused contact area of the laser beam in the resulting tube moves completely along the closed dividing line, while the pipe section is separated from the resulting tube.
  • Different processing optics can be used for material processing with laser beams. They all use optical elements in the form of lenses and / or mirrors to focus the laser beam.
  • optical elements for the beam guidance and transparent optical elements can be used in which the beam direction is changed due to the refraction on the surfaces of the elements. These elements include elements with plane-parallel surfaces and prisms with surfaces that run at certain angles to each other.
  • further tasks have to be solved for successful material processing. For cutting it is common that additives are supplied.
  • Opti- cal elements that overheat during material processing must be cooled. This also applies, for example, to highly reflective mirrors which absorb between 0.5 and 2% of the laser power.
  • protective devices in particular with gas streams, dirt and dust are kept away from the optical elements.
  • the type of polarization of the laser light can be optimized for the respective application.
  • linearly polarized laser be advantageously used, wherein the polarization direction preferably coincides with the cutting direction.
  • the laser beam melts the material continuously and the melt is usually blown out of the kerf by a gas flow.
  • Flame cutting is a standard method of cutting steel using oxygen as a cutting gas.
  • nitrogen is usually used as the cutting gas, but argon is used in the processing of titanium.
  • Compressed air can also be used to cut thin sheets, which is advantageous due to the lower costs. Compressed air at 5 to 6 bar is enough to blow the melt out of the kerf. Because the air must be dried and de-oiled prior to compression, the cost advantage relative to nitrogen.
  • the suction of the melt can also be provided by arranging a suction device in the region of the parting line.
  • the blowing and sucking can also be used in combination.
  • the laser should evaporate the material with as little melt as possible, which can be achieved with high laser powers and smaller cutting speeds. Frequently, a pulsed laser is used.
  • a plasma cloud of ionized metal vapor and ionized cutting gas forms in the kerf.
  • the plasma cloud causes more energy to enter the material. This allows higher cutting speeds.
  • the plasma cloud may not be up from the
  • Plasma-assisted fusion cutting is very advantageous for thin sheets because it enables very high cutting speeds. With a sheet thickness of 1 millimeter, a speed of 40 meters per minute can be achieved.
  • the degree of absorption depends on laser wavelength, the laser polarization, the angle of incidence of the laser beam, the tube material, the temperature, as well as the geometry and the nature of the surface. The higher the degree of absorption, the more energy is available for processing.
  • the thermal conductivity of the pipe material influences the machining process, the lower it is, the better the processing can be done with lower energy.
  • the power density corresponds to the power applied per area.
  • the power density and the exposure time determine which energy per surface is introduced into the machined material.
  • the power density can be controlled via the laser power and the focusing.
  • the exposure time can be adjusted by pulsed lasers over the pulse duration and in the moving state via the feed rate. For cutting power densities from 10 kW / mm 2 and exposure times in the range of milliseconds can be used.
  • the laser beam should hit the surface to be processed in such a way that the energy required for cutting is absorbed.
  • the size of the depth of field also has an influence on the cutting process.
  • the depth of field defines an extent in the direction of the laser axis within which the beam cross-section is widened to twice the focus area. If a jet passes flat on the material to be processed, the depth of field may not extend too far into the material to make a cut through the material.
  • a closed dividing line is formed around the section axis along the circumference of the pipe, wherein the parting line preferably lies in a parting plane which is continuously advanced with the resulting pipe and perpendicular to the section axis.
  • the laser beam is aligned with the tube axis and between the parting plane and the axis of the impinging on the tube beam section is an angle which is less than 45 °, preferably less than 30 ° and in particular is less than 15 °.
  • the first annularly closed optical element extends in a circle around the section axis, and a surface extending in longitudinal planes through the section axis to the section axis inclined, in particular conical or concave and the laser scanning device is aligned substantially in the direction of the section axis on the resulting tube, wherein the focusing effect of the first annularly closed optical element and the focus configuration of the received on the first optical element Ensuring the beam necessary for the cutting focus on the contact area.
  • the laser scanning device is arranged stationary and when separating the alignment of the laser beam on the continuously advanced dividing line achieved in that the position of the laser beam on the portion directly in front of the first annularly closed optical element relative to the section axis during movement of the laser beam is changed along the circumference of the first annularly closed optical element.
  • the position of the laser beam is matched to the deflection characteristic of the first optical element, the position of the impact position along the circumference of the first, annularly closed optical element and the feed rate of the resulting tube, which are dependent on the radial impact position of the laser beam on the first annularly closed optical element.
  • the laser scanning device comprises at least one movable mirror and in particular an adjustable focusing element.
  • the first annularly closed optical element is arranged around the resulting tube and therefore the laser beam is directed from the outside of the resulting tube forth on the dividing line.
  • the position of the first optical element must always be maintained very accurately during operation, so that the dividing line is executed correctly. This exact position can be ensured more easily with a first optical element arranged on the outside of the tube than with a first optical element arranged inside the tube, which element would have to be held over a large distance from the feed side of the strip material.
  • a further advantage of the first optical element arranged on the outside is that due to the deflection of the laser beam in one direction with a portion radially inward, the beam is slightly focused in its extension tangentially to the parting line.
  • the deflection to the outside would lead to slight defocusing, which means that the supplied beam would have to be more focused, thus the desired focus would be achieved with the tube.
  • the space remains free for a dispenser for dispensing separated tube sections.
  • a dispenser can hold the pipe section during the cutting process and, if necessary, ensure that the pipe section is acted on by a force in the direction of the pipe advance. After complete separation, the dispenser can ensure, with a tilting motion, that the tube section is removed without contact with the exteriorly disposed first optical element.
  • the laser scanning device comprises a transverse to the section axis outwardly deflecting optical element which is rotatably mounted about the section axis and of which the laser beam in an adjustable Distance is directed to the section axis substantially parallel to the section axis on the first annularly closed optical element.
  • the outwardly deflecting optical element is formed, for example, as a laser-breaking element with two plane-parallel surfaces. If this preferably cylindrical element leads away from the section axis at an adjustable angle, then a laser beam aligned along the section axis can enter the deflecting optical element through one of the plane-parallel surfaces and emerge again from the section axis through the other of the plane-parallel surfaces. In this case, the exiting beam is continued parallel to the incoming beam.
  • the distance between these two beam sections depends on the distance between the two plane-parallel surfaces of the deflecting optical element and the angle between the section axis and the plane-parallel surfaces. It goes without saying that the deflecting optical element, for example, can also be formed from two interacting prisms with an adjustable distance.
  • Another simple entrainment of the laser cutting point in the axial direction with the tube movement can be achieved if another annularly closed used optical element and a laser beam generated by the laser scanning device is guided at least once along the entire circumference of the first and the further annularly closed optical element, wherein the beam is guided via the further annularly closed optical element to the first annularly closed optical element ,
  • the construction of the first and the further optical element is particularly simple if the beam from the laser scanning device passes radially outward to the further optical element substantially perpendicular to the section axis. It would be possible for a laser beam rotating about the section axis to be deflected from a static, rotationally symmetric element to the further optical element, whereby the laser beam would be somewhat defocused at least in the beam extension perpendicular to the section axis due to a convex portion of the convex deflection surface.
  • a planar or possibly concave optical element rotating around the section axis and deflecting radially outwards is used.
  • This rotating element can be formed with a mirror or optionally with at least one prism, for example a pentaprism.
  • the laser beam is directed coaxially to the section axis on the radially outwardly deflecting optical element.
  • the first and the further annularly closed optical element are both preferably each designed as conical mirrors with opening angles of 45 °.
  • the rotating optical element of the laser scanning device is also designed to be displaceable along the section axis.
  • the entrainment of the laser cutting point in the axial direction with the tube movement can also be achieved by a movement of the first optical element.
  • the laser scanning device can be arranged stationary. When separating the alignment of the laser beam is achieved on the continuously advanced dividing line, that the first annularly closed optical element is moved during separation with the resulting tube. If necessary, the alignment of the laser beam must also be adjusted.
  • focusing elements such as lenses and concave mirrors can be arranged at different locations and formed differently.
  • an annular focusing element is optionally used, which also the plane in planes with the section axis (ie perpendicular for tangential focusing).
  • the first optical element is formed by a mirror, the focusing in planes with the section axis can be ensured by a corresponding curvature of the mirror in sections with these planes.
  • the focusing in the planes with the section axis is achieved by an annular lens, which is preferably arranged between the first optical element and the tube. Because the focusing achievable by the first optical element is directed not tangentially to the pipe surface but to the section axis, the laser beam emerging from the laser scanning device is preferably already slightly focused in order to ensure a focus on the pipe surface at the end of the beam guidance.
  • the present invention is not limited to the separation of pipe sections of a circular cross-section pipe. If the tube has a different cross-section, for example an oval or optionally a substantially rectangular cross-section, then the first ring-shaped closed around the section axis optical element is formed accordingly and adapted the leadership of the laser beam to the first optical element on the geometry thereof. It is a major advantage of the new and innovative solution that now pipes with any Cross sections can be edited. When changing from one cross-sectional size and shape to another, at least the first optical element must be replaced. In addition, the control of the laser scanning device must be adapted. In the case of solutions with a further annular optical element and / or an optical element deflecting outwards transversely to the section axis and / or with annular focusing elements, at least one of these elements may also have to be exchanged.
  • a further annular optical element and / or an optical element deflecting outwards transversely to the section axis and / or with annular focusing elements at least one of these elements
  • the solution according to the invention for separating pipe sections from the pipe continuously produced by means of a longitudinal weld seam can be used particularly advantageously for the production of can jackets, because their wall thickness is so small that laser cutting is particularly efficient. If the strip material is provided with a decorative film and / or an inner film, then the film can be separated directly on separation of the jacket sections together with the stability-giving part of the tube or of the jacket strip. This can be dispensed with a separate separation of thin film pieces.
  • a laser beam generated by a laser scanning device is guided along the circumference of an optical element annularly closed around the section axis and thereby deflected transversely to the section axis onto the parting line, only the area to which the laser beam strikes is required for the deflection. It is therefore possible to use an optical deflecting element with a substantially smaller deflecting surface, wherein this smaller deflecting surface has to be rotated about the section axis such that the laser beam always strikes the rotating deflecting surface.
  • the smaller element can be formed so that the laser beam maintains a rotationally symmetrical focusing during the deflection.
  • plane or optionally beam-centered concave mirrors are used.
  • At least one rotatably mounted, rotationally symmetrically deflecting optical deflecting element is rotated about the section axis in the region of the dividing plane continuously advanced with the resulting tube, and the laser beam is deflected at least over partial regions of this rotating optical deflecting element to the dividing line transversely to the section axis.
  • the rotating optical deflecting element can be moved in the direction of the section axis.
  • the deflection surface of the rotating optical deflection element can be made sufficiently large radially to the section axis, so that the movement of the focused contact region of the laser beam with the separation plane by a movement of the laser beam on the deflection surface of the rotating optical deflection element can be achieved with a radial movement component to the section axis.
  • the entire movement of the laser beam impinging on the deflection surface is composed of a portion of a movement about the section axis and a portion radial to the section axis.
  • the inventive embodiments make it possible to carry the focused contact region of the laser beam in the resulting tube in the continuous with the resulting tube dividing plane and the rotation of the focused contact area around the tube. If parts of the separating device used for this purpose have to be accelerated, they are designed with the smallest possible mass, so that the acceleration forces remain small. In the circumferential direction can be dispensed with an acceleration of mass, when the at least one optical element, which deflects the laser beam supplied by a laser scanning device transversely to the section axis on the dividing line, immovable or rotating at a constant rotational speed about the section axis is used.
  • the minimum acceleration forces are particularly easy to achieve when the laser beam is supplied to the laser scanning device from the open leading end side of the resulting tube, preferably coaxially or at an acute angle to the section axis.
  • the laser scanning device does not have to be moved in the direction of the section axis.
  • a free space is provided at least temporarily and at least in one direction radially to the section axis, through which the pipe section can be led away.
  • FIG. 1 is a perspective view of the tube during the expansion and separation of pipe sections
  • Fig. 2 is an end view of the tube when closing, welding and widening
  • Fig. 3 is a perspective view of a widening element for expanding the
  • FIG. 4a shows a schematic longitudinal section through the laser cutting device with a concave first annular optical element
  • FIG. 4b shows a schematic longitudinal section through the laser cutting device with a convex first annular optical element
  • FIG. 5 shows a schematic longitudinal section through the laser cutting device with a concave first annular optical element and with a rotatable and pivotable outwardly deflecting optical element
  • Fig. 6 is a schematic longitudinal section through the laser cutting device with two annular conical mirrors and a order 7 shows a schematic longitudinal section through a laser cutting device with three flat mirrors rotating about the cutting axis, one of which is displaceable along the section axis
  • FIG. 8 shows a schematic longitudinal section through a laser cutting device with three flat mirrors rotating about the cut-off axis, all of which are displaceable along the section axis
  • FIG. 9 shows a schematic longitudinal section through a laser cutting device with a flat mirror rotating around the section axis in the interior of the tube.
  • Figures 1 to 6 describe solutions for separating pipe sections which are particularly advantageous for providing can jackets for can making. With these solutions, it is possible to separate short pipe sections from the resulting pipe in short cutting cycles.
  • FIG. 1 to 3 show schematically how a flat pressed closed metal strip 1 is formed in a widening region 2 with a widening element 3 in the interior of the closed metal strip in a circular cross-section tube 4. From the resulting tube 4 pipe sections 5 are separated.
  • the widening element 3 is held by support rods 6, which are arranged in the two curved regions 7 of the flattened metal strip 1 and according to FIG. 2 from the widening element 3 to a holder 8 in a region extend, in which the band-shaped sheet 9 is not yet closed. It has been found that it is advantageous for the further processing if the radius of curvature of the curvature regions 7 is selected larger than shown in the drawing, so that the middle flat region extends over a shorter cross-sectional dimension than the two curvature regions 7 together. It is advantageous if all curvatures occurring in cross section have the greatest possible radii of curvature.
  • a sealing bead 10 is arranged on the flat material 9.
  • the flat material is converted into the flattened closed mold with rollers, not shown, and welded to the laser beam guided through a laser feed 11. Subsequently, if necessary, the sealing bead 10 is brought by means of a melting process on the inside of the longitudinal seam. Then the tube arrives
  • supply lines 12 can be arranged.
  • a supply line 12 is provided by a support rod 6 by way of example.
  • the feed lines 12 are used, for example, for actuating a dispensing device described with reference to FIG. 5 for dispensing severed pipe sections 5.
  • gas for the laser cutting is guided through such feed lines 12 into the tube interior.
  • a corresponding drive device is provided for a hydraulic or pneumatic actuation of the dispensing device.
  • FIG. 4 a shows an embodiment of the laser cutting device with a first annularly closed optical element 14 in the form of a mirror whose reflective surface is concave in the illustrated sectional plane.
  • the first optical element 14 is at the parting line 16 around the pipe section to be separated
  • the reflective surface is conical, in which case both an adapted beam guidance and an adapted focusing must be selected.
  • the first optical element could also be designed as a totally reflecting prism, for example in the form of an annular penetrant with curved entrance and exit surfaces in sectional planes which comprise the section axis. Even a combination of annular mirrors, prisms and lenses would be possible.
  • the dividing line 16 is shown obliquely to the section axis 15, because it is a representation of the formation of the dividing line on the advanced pipe 4.
  • the free end face 4a, 4b and 4c of the tube 4 is also shown in three positions, namely at the beginning 4a, in the middle 4b and at the end 4c of the cutting process.
  • a laser scanning device 18 is aligned substantially in the direction of the section axis 15 on the resulting tube 4 and can direct a laser beam 17 along the entire circumference of the first optical element 14 on this.
  • the focus area of a portion 17a of the laser beam 17 directed to the tube 4 is at the starting point 16a of the dividing line 16.
  • the laser beam 17 is directed by the laser scanning device 18 onto a starting area 14a of the first annularly closed optical element 14.
  • the starting region 14a is aligned and concavely curved such that the laser beam 17 strikes the starting point 16a of the parting line 16 after the deflection at the first optical element 14 with the desired focus.
  • the laser beam 17 is moved by the laser scanning device 18 about the section axis 15, wherein the angle between the section axis and the axis of the laser beam 17 is continuously increased.
  • the focus area of the tube 4 directed portion 17a of the laser beam 17 is at the central location 16b of the separation line 16, the laser beam 17 being deflected at a central area 14b of the first closed loop optical element 14.
  • the focus area of the portion 17a of the laser beam 17 directed to the tube 4 is at the terminal 16c of the separation line 16, the laser beam 17 being deflected at an end portion 14c of the first annularly closed optical element 14.
  • the laser beam 17 emanating from the laser scanning device 18 is shown as a beam with a parallel beam boundary. It goes without saying that preferably already the laser beam 17 will be somewhat focused at least in its extension tangential to the dividing line 16, so that the desired focus is given at the parting line 16. Because the length of the beam sections 17 and 17a varies along the dividing line 16, the focusing is preferably also continuously adjusted during the cutting process.
  • the curvature of the concave mirror surface of the first optical element 14 shown in FIG. 4 shows that the curvature is similar to a parabola. The stronger curvature in the areas which are closer to the tube, allows for differently oriented laser beams 17 both a desired focus as well as a steep alignments of the pipe 4 directed to the sections 17 a.
  • the focusing effect of the first annularly closed optical element 14 and the focus configuration of the laser beam reaching the first optical element 14 ensure the necessary focusing of the contact area at the parting line 16.
  • the parting line 16 lies in the parting plane. Between the dividing plane and the axis of the jet section 17a impinging on the tube, an angle is formed, which is always smaller than 45 °, preferably smaller than 30 ° and in particular smaller than 15 °, along the entire dividing line.
  • the first optical element is preferably cooled.
  • an annular gas feed 19 is assigned to the first optical element. From the gas supply 19 flows through a correspondingly shaped outlet opening 19a, the desired cutting gas, possibly compressed air, to the dividing line 16. If necessary, a negative pressure is generated in the interior of the pipe section 5 in order to lead away the molten material better.
  • the first optical element 14 can also be displaced in the direction of the section axis 15 in order to ensure entrainment with the pipe feed.
  • FIG. 4 b shows an embodiment in which the first annularly closed optical element 14 is formed by a conical mirror surface inside the tube 4.
  • a sectional plane is shown, which includes the section axis 15.
  • the laser beam 17 is deflected by the reflection at the conical mirror surface only to the starting point 16a of the parting line 16.
  • the focusing of the laser beam 17 is selected in this sectional plane so that the focus of the laser beam is at the starting point 16a.
  • suction device generates a negative pressure in the region of the parting line in order to better lead away the molten material.
  • the focusing of the laser beam is shown perpendicular to the above-mentioned sectional plane, or tangentially to the conical mirror surface. Because the conical mirror surface deflects defocusing in this beam extension, the supplied laser beam 17 must be more focused in this beam extension, so that the focus in this beam extension after the deflection is likewise at the starting point 16a of the parting line 16.
  • the laser scanning device 18 must therefore provide along with the beam guide along the annular mirror surface and a beam shape with different beam width and focusing in the two main directions of the beam cross-section, the main directions must be rotated when turning the beam, so that the larger extent upon impact of the laser beam 17th on the conical mirror surface to this is always aligned tangentially. It goes without saying that the mirror surface in the sectional plane could also be convex or concave, but then the formation of the laser beam 17 would have to be selected accordingly.
  • the laser scanning device 18 comprises a laser source 18a and an optical element 18b deflecting transversely to the section axis, which is rotatably mounted about the section axis 15 and the distance of the laser beam 17 from the section axis can adjust.
  • the outwardly deflecting optical element 18b is formed, for example, as a laser-breaking element with two plane-parallel surfaces 20. If now this element leads away from the section axis 15 at an adjustable angle 19, then a laser beam section 17b supplied along the section axis 15 can pass through one of the plane-parallel surfaces 20 enter the deflecting optical element 18b and spaced from the section axis 15 again through the other of the plane-parallel surfaces 20 exit. In this case, the exiting laser beam 17 is continued parallel to the entering laser beam section 17b.
  • the distance between these two beam sections depends on the distance between the two plane-parallel surfaces 20 of the deflecting optical element 18b and the angle 19 between the section axis 15 and the plane-parallel surfaces 20.
  • the deflecting optical element 18b for example, can also be formed from two interacting prisms with an adjustable distance, wherein the adjustment of the distance between the two prisms then replaces the adjustment of the angle 19.
  • the deflecting mirror surface may be formed spherical surface similar, so that the focusing effect of the mirror surface in the cross section of the laser beam is substantially equal in all directions.
  • a dispenser 21 for dispensing severed tube sections 5.
  • a dispenser 21 may hold the tube section 5 during the cutting operation and after complete separation, the dispenser may ensure with a tilting movement that the tube section is out of contact with the exterior arranged first optical element 14 is guided away.
  • the dispensing device 21 is arranged on a mandrel 22 of the tube forming device and comprises a holding part 23, a pivot connection 24 and an actuating element 25.
  • the actuating element is designed as a movable in the direction of the section axis 15 piston, which on a guide 26 of the holding part 23rd is fixed so that, together with the pivotal connection, the desired tilting movement of the holding part 23 can be achieved.
  • a flexible compressed air supply 27 and in the holding part 23, an annular outlet nozzle 28 is formed.
  • the exiting through the outlet nozzle 28 air acts on the pipe section 5 with a force in the feed direction, which can be used against the end of the formation of the cutting line and the dispensing of the pipe section 5 advantageous.
  • the holding member 23 is tilted with the free end down. So that the resulting Pipe 4 is also present on the tilted holding member 23 is nowhere, a recess 23 a is provided in the holding part 23.
  • FIG. 6 shows an embodiment in which the first optical element 14 comprises a conical mirror surface 29. Because now the deflection on the first optical element 14 in planes with the section axis 15 does not focus, a laser beam is used, which is already focused in these planes, which is represented by the converging lateral beam boundaries. With a schematically illustrated lens element 30, an additional focusing can be achieved in the planes with the section axis 15, which is preferably chosen to be tangential to the parting line in accordance with the focusing. If, therefore, the focusing is substantially the same due to the radially inwardly deflecting conical mirror surface 29 and the lens element 30, a rotationally symmetric laser beam 17 can be deflected into a rotationally symmetrical laser beam section 17a.
  • the laser beam 17 aligned parallel to the section axis 15 comes from a further annularly closed optical element 31, which preferably comprises a conical mirror surface 32. If the opening angles of the two mirror surfaces 29 and 32 are substantially 45 ° relative to the section axis 15 and the mirror surfaces 29 and 32 are aligned with one another, an axial displacement can take place with a beam section 17c which can be displaced radially in the direction of the section axis 15 and radially onto the further optical element 31 of the radially incident on the tube laser beam portion 17a can be achieved.
  • annularly closed prisms can be used, for example, in the form of an annular pentaprism, the inlet and outlet surfaces being aligned in section planes with the section axis 15 at an angle of 90 ° to one another.
  • the laser scanning device 18 comprises a planar or optionally concave optical element 33 which rotates radially outward about the section axis 15.
  • This rotating radially outwardly deflecting optical element 33 can be formed with a mirror or optionally with at least one prism, for example a pentaprism.
  • a supplied laser beam section 17b extends along the section axis 15 to the radially deflecting optical element 33.
  • the laser scanning device comprises both a feed device 34 with a guide 35 and a drive 36.
  • the feed of the feed device 34 be matched exactly to the feed of the tube 4.
  • a rotating device 37 with storage and drive is inserted between the advanceable part 38 and the radially deflecting optical element 33.
  • the radially deflecting optical element 33 comprises a mirror 33 a and a Spiegelhalte- tion 33 b, which is connected to the rotating part of the rotary device 37.
  • the supplied laser beam 17b is irradiated to it exactly during one revolution of the continuously rotating mirror 33a.
  • the mirror 33a is in the position A and the laser beam is guided via the deflection regions 31a and 14a of the two annular optical elements 31 and 14 to the starting point 16a on the parting line 16.
  • the mirror 33a is in the position B and the laser beam is guided via the deflection regions 31b and 14b of the two annular optical elements 31 and 14 to the middle point 16b on the parting line 16.
  • the mirror 33a is in the position C and the laser beam is guided on the parting line 16 via the deflection regions 31c and 14c of the two annular optical elements 31 and 14 to the terminal 16c.
  • the deflection of the radially outwardly leading laser beam 17c on the further annular optical element 31 in the extension of the beam tangent to the circumference of the further annular optical element 31 is only substantially parallel or only slightly defocused, if the radial beam section is in the shape of one of the section axis outgoing expanded beam has. Accordingly, the beam on a plane mirror 33a perpendicular to the section plane shown must have a narrow shape which widens with increasing distance from the section axis 15.
  • a beam-shaping optical element 39 for example a special lens arrangement, is fastened to the rotating part of the rotary device 37 together with the mirror 33a.
  • the two annular optical elements 14 and 31 are of symmetrical construction, it is easiest if the tangential beam focusing in the area of the mirror 33a corresponds to the desired focusing in the region of the dividing line.
  • the desired configuration of the radial beam section may optionally also be achieved by that the mirror 33 is not formed flat but with a concave and convex portion, convex over the section axis and concave underneath.
  • FIG. 7 shows an embodiment in which at least one rotatably mounted optical deflecting element 40 is rotated about the section axis 15 in the area of the dividing plane continuously advanced with the resulting tube 4, and the laser beam 17 over portions of this rotating optical deflecting element 40 transverse to the section axis 15 on the dividing line 16 is diverted.
  • the rotating optical deflection element 40 is preferably designed as a plane mirror surface, but optionally as a prism, for example as a pentaprism, and arranged on a rotating device 41.
  • the rotating device 41 is connected via a pivot bearing 42 and a drive device 43 with a frame part 44.
  • the drive device 43 drives the rotary device 41 via a drive transmission 45.
  • the laser scanning device 18 generates a radially outwardly leading around the section axis 15 rotating laser beam portion 17c and includes one to the
  • Section section 15 rotating radially outwardly deflecting optical element 33 This rotating radially outwardly deflecting optical element 33 may be formed with a mirror or optionally with at least one prism, for example a pentaprism. From the laser source 18a, a supplied laser beam section 17b extends along the section axis 15 to the radially deflecting optical element 33.
  • the laser scanning device comprises a feed device 34 with a guide 35 and a drive 36.
  • the feed of the feed device 34 be matched exactly to the feed of the tube 4.
  • a rotating device 37 is inserted between the advancing part 38 and the radially deflecting optical element 33.
  • the radially deflecting optical element 33 includes a mirror 33 a and a mirror mount 33 b connected to the rotating part of the rotary device 37.
  • a further rotatably mounted optical deflection element 40 is arranged and the laser beam section 17c is deflected over partial areas of this rotating optical deflection element 40 parallel to the section axis 15 to the rotatably mounted optical deflection element 40 at the parting plane.
  • the further rotating optical deflecting element 40 is also arranged on a further rotating device 41, which is connected to the frame part 44 via a further rotary bearing 42 and the drive device 43.
  • the drive device 43 drives the rotary device 41 via the drive transmission 45.
  • the two rotatably mounted optical deflection elements 40 are rotated synchronously about the section axis.
  • a rotary coupling 46 transmits the rotation of the further rotary device 41 to the radially deflecting optical element 33 or to the mirror mount 33b.
  • the rotational coupling 46 is ensured, for example, by means of a form-fitting engagement in the circumferential direction but displaceable in the axial direction.
  • the two rotating devices 41 are arranged fixed in the direction of the section axis. Therefore, only acceleration forces for the axial movement of the radially deflecting opti- see element 33 is necessary. Because this can be built very easily, it is small forces.
  • the rotating parts are rotated at a constant speed.
  • the supplied laser beam 17b is irradiated to it exactly during one revolution of the continuously rotating mirror 33a.
  • the mirror 33a is in the position A and the laser beam 17 is guided over the deflection regions 40a of the two rotating optical deflection elements 40 to the starting point 16a on the parting line 16.
  • the mirror 33a is in the position C and the laser beam 17 is guided via the deflection regions 40c to the end point 16c on the parting line 16.
  • the beam is already focused at the exit from the laser source 18a, which is associated with an undesirably large focal length.
  • a focusing device 48 which is drawn in the rotary device 37, can also be arranged on one of the rotating devices 41 or also on the mirror holder 33b in the laser beam and then the laser beam between the laser source 18a and the focusing lens is designed as a parallel steel.
  • the Focusing device 48 adjusts the beam focus required at the parting line 16 in each case in accordance with the changing length of the laser beam 17 from the focusing device to the parting line.
  • the free end faces 4a, 4b and 4c of the resulting tube 4 are shown in three positions, namely at the beginning 4a, in the middle 4b and at the end 4c of the cutting process.
  • FIG. 8 shows an embodiment in which two rotatably mounted optical deflection elements 40 are arranged together with a radially outwardly deflecting optical element 33 in a closed housing 47.
  • the rotational mounting for the rotation of these optical elements 40, 33 about the section axis 15 is formed as part of the laser scanning device 18.
  • the laser scanning device 18 includes a feed device 34 with a guide 35 and a drive 36. At Cutting the feed of the feed device 34 must be matched exactly to the feed of the tube 4.
  • a rotating device 37 is inserted between the advancing part 38 and the radially deflecting optical element 33.
  • the radially deflecting optical element 33 comprises a mirror 33 a and is connected via the housing 47 with the rotating part of the rotary device 37.
  • a drive device 43 drives the housing 47 via a drive transmission 45.
  • the drive transmission 45 comprises, for example, two sprockets 45a which are displaceable relative to one another in the axial direction, one of which is connected to the drive shaft 45b and the other to the housing 47.
  • An optical deflecting element 40 moves about the section axis 15 in the region of the separating plane which is continuously advanced with the resulting tube 4, so that the laser beam 17 is deflected transversely to the section axis 15 onto the dividing line 16 via this rotating optical deflecting element 40.
  • the rotating optical deflection element 40 is preferably formed as a plane mirror surface, but optionally as a prism, for example as a pentaprism.
  • the focus area of a section 17a of the laser beam 17 directed onto the pipe 4 lies at the starting point 16a of the dividing line 16 and at the end of the cutting process at the terminal 16c.
  • the laser scanning device 18 generates with the outwardly deflecting optical element 33 a radially outwardly leading to the section axis 15 rotating laser beam section 17c.
  • This rotating radially outwardly deflecting optical element 33 can be formed with a mirror or optionally with at least one prism, for example a pentaprism.
  • a supplied laser beam section 17b extends along the section axis 15 to the radially deflecting optical element 33 and from there via the two deflection elements 40 to the tube 4.
  • the laser beam 17 is not focused at the exit from the laser source 18a.
  • a focusing device 48 for example a lens, can be arranged at an optimum position in the housing 47 and then the laser beam is formed between the laser source 18a and the focusing lens as parallel steel and then focused.
  • the length of the laser beam 17 does not change from the focusing device to the parting line 16, so that no adjustment of the position of the focus is necessary.
  • the free end faces 4a, 4b and 4c of the resulting tube 4 are shown in three positions, namely at the beginning 4a, in the middle 4b and at the end 4c of the cutting process.
  • gas can be supplied to the cutting area to blow molten material from the kerf during laser cutting.
  • the gas passes for example via a feed 49 in the region of the laser source 18a into the interior of the housing 47.
  • an outlet nozzle 50 is inserted on the housing.
  • FIG. 9 shows an embodiment in which the rotatably mounted optical deflecting elements 40 are arranged inside the tube 4 in the region of the dividing plane which is continuously advanced with the resulting tube 4.
  • the rotary actuator is located in an inner part 51 and sets the deflecting element 40 via a shaft 52 in motion.
  • the laser beam 17 supplied by the laser scanning device 18 is blasted onto the latter at least during one revolution of the continuously rotating deflection element.
  • the alignment of the laser scan device 18 must be adjusted coordinated beam with the rotation of the deflecting element 40 are changed, so that the deflection for the points 16 a, 16 b and 16 c takes place at the areas 40 a, 40 b and 40 c.
  • the laser scanning device 18 does not only have to rotate the beam 17 about the section axis 15, but, additionally superimposed with this movement, must also move radially to the section axis.
  • the beam focus required at the parting line is set by the laser scanning device 18 in each case in accordance with the changing length of the laser beam 17.
  • a focusing device adjusts the beam focus required at the parting line in each case in accordance with the changing length of the laser beam from the focusing device to the parting line.

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

Abstract

Lors de la séparation de sections de tube (5) d'un tube (4) en formation continue, une ligne de séparation fermée (16), qui est espacée d'une longueur de section de l'extrémité libre du tube, est réalisée autour de l'axe de section (15) le long du pourtour du tube. Pour séparer une section de tube (5), un faisceau laser (17) produit par un dispositif de balayage de laser (18) est dirigé le long de tout le pourtour du tube en formation (4) toujours transversalement à l'axe de section (15) sur la ligne de séparation (16) de sorte qu'une zone de contact essentiellement focalisée du faisceau laser (17a) est guidée totalement le long de la ligne de séparation fermée (16) alors que le tube (4) est en formation et la section de tube (5) est de ce fait séparée du tube (4) en formation.
EP09760460A 2008-12-03 2009-11-30 Procédé et dispositif pour fabriquer des sections de tube en utilisant un faisceau laser mû par un dispositif de balayage; section de tube correspondante Withdrawn EP2373455A1 (fr)

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CH01890/08A CH700083A2 (de) 2008-12-03 2008-12-03 Verfahren und Vorrichtung zum Herstellen von Rohrabschnitten.
PCT/CH2009/000382 WO2010063132A1 (fr) 2008-12-03 2009-11-30 Procédé et dispositif pour fabriquer des sections de tube en utilisant un faisceau laser mû par un dispositif de balayage; section de tube correspondante

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