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
  • B23K26/14—Working by laser beam, e.g. welding, cutting or boring using a fluid stream, e.g. a jet of gas, in conjunction with the laser beam; Nozzles therefor
  • B23K26/142—Working by laser beam, e.g. welding, cutting or boring using a fluid stream, e.g. a jet of gas, in conjunction with the laser beam; Nozzles therefor for the removal of by-products
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B08—CLEANING
  • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
  • B08B15/00—Preventing escape of dirt or fumes from the area where they are produced; Collecting or removing dirt or fumes from that area
  • B08B15/04—Preventing escape of dirt or fumes from the area where they are produced; Collecting or removing dirt or fumes from that area from a small area, e.g. a tool
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B08—CLEANING
  • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
  • B08B5/00—Cleaning by methods involving the use of air flow or gas flow
  • B08B5/04—Cleaning by suction, with or without auxiliary action

Definitions

• the invention relates to a laser processing system according to the preamble of patent claim 1.
• Such a laser processing system with an extraction is known for example from US 6,229,112 B1.
• the laser cutting system described therein has chambers arranged inside the machine bed for the extraction of cutting dust and / or flue gases and is completely encapsulated by a machine housing except for an inflow opening. This is the same as when aspirating through the encapsulation of the laser machining
• CONFIRMATION COPY tion system in their interior resulting negative pressure.
• the inflow opening is realized via a gap in the region of the workpiece feed at the level of the workpiece support.
• the resulting pleasure current thus supports the extraction below the workpiece.
• Further arranged in the roof of the housing (secondary) inflow ensure a flow through the entire interior of the enclosure to prevent accumulation of particles in so-called "dead zones”.
• the interior of the enclosure is separated by the flow band spatially in two areas, namely in the flow-through laser processing area in which dirt particles and process gases / smoke are generated, and in the non-flowed laser interaction-free area, which is kept free of dirt particles and flue gases , Since not the entire interior of the housing, but only the laser processing area flows through and is sucked, resulting according to the invention Both cost savings through smaller suction units or higher efficiency in the same suction units as well as lower maintenance and operating costs by reducing wear and failure of individual machine components.
• the flow band is deflected by means of a deflection device to a circular flow surrounding the laser processing area so as to hold dirt particles and flue gases within the circular flow until they are sucked off via the suction opening.
• FIG. 1 shows a first embodiment of the laser machining system according to the invention
• Fig. 2 shows schematically the flow pattern of the shown in Fig. 2
• FIGS. 3 to 5 further embodiments of the laser processing system according to the invention.
• the laser processing system 1 shown in FIG. 1 comprises a workpiece support 2, a laser machining unit (eg laser machining head) 3 arranged above the workpiece support 2 for machining a workpiece 4 located on the workpiece support 2, a suction opening 5 provided underneath the workpiece support 2 and a housing 6 which the workpiece support 2, the laser processing unit 3 and the suction opening 5 delimits its outer environment and which is completely encapsulated except for an air inlet opening 7.
• About the suction opening 5 are in the La- ser machining of the workpiece 4 accumulated flue gases and cutting dust aspirated (flow arrow 8). Air is passed over via the inflow opening 7 in order to compensate for the negative pressure arising during the aspiration within the enclosure 6.
• the suction opening 5 is connected to a waste container 9 in order to receive therein the waste materials extracted during processing, such as slag particles.
• the inflow opening can also be mounted on the housing 6 so as to be vertically movable by means of a suitable actuator (not shown).
• the laser processing unit 3 is arranged on a X-Y movement unit 16 which can be moved parallel to the workpiece support 2 and which is designed, for example, as an extension arm which can be moved over the workpiece support 2.
• the laser processing unit 3 may be deliverable via a Z slide 17 provided on the XY movement unit 16 also in the vertical direction, ie perpendicular to the workpiece support 2.
• the air inflow opening 7 is located laterally next to the workpiece support 2 and is arranged in height between the workpiece support 2 and the movement unit 15, in particular above the workpiece top edge 4a, in such a way that the contour of the movement unit 16 does not hinder the flow band to be formed from the inflowing air At least approximately 100 to approximately 200 mm below the movement unit 16.
• the air flowing in via the inflow opening 7 forms, in cooperation with the suction downwards via the suction opening 5, a slightly downwardly inclined air flow band 10 between the workpiece support 2 and the laser processing unit 3 off.
• the inclination of the air flow band 10 can be supported by a likewise inclined design of the inflow opening 7 and / or the flap (s) assigned to it.
• the inclination of the air flow band 10 is adjusted such that the air flow band 10 does not impinge perpendicularly on the vertical housing portion 6a.
• a horizontal air flow band 10 may be introduced, with the previously vertical housing portion 6a being inclined to the air flow band 0 to yield a downwardly directed air flow band 10.
• the interior of the housing housing 6 is located in a region below the flow belt 10.
• the incoming air flow passes over the entire laser interaction zone on the workpiece 4 and thus separates the interior of the enclosure 6 into the targeted laser processing area 1 and the non-perfused laser interference-free area 12
• the dirt particles and flue gases resulting from the laser machining of the workpiece 4 remain in the laser processing area 11 due to the flow belt 10, where they are sucked off.
• the suction efficiency is significantly increased and the residual contamination of the laser interaction-free region 12 by dirt particles and flue gases significantly reduced.
• Housing section 6a and on the right side is formed by a separate vertical baffle plate 14, deflected to a circular flow 15 enclosing the laser processing region 11.
• a separate vertical baffle plate 14 deflected to a circular flow 15 enclosing the laser processing region 11.
• a plurality of air inflow openings 7 can be provided at different heights, which can be activated selectively or combined to form flow bands 10 of different heights.
• the plurality of air inflow openings 7, which have a jet labyrinth for protection against exiting laser radiation, can be activated by means of flaps, for example, depending on the respective height of the laser processing unit 3 to form flow belts 10 of different heights.
• FIG. 2 shows schematically the flow course of the flow belt 10.
• the flow belt 10 After the flow belt 10 has flowed past the top of the workpiece 4, it is sucked by two provided on both sides of the flow belt 10, transverse to the flow belt 10 open suction 5.
• the flow belt 10 is divided in the middle into two flow halves 10a, 10b, which are each sucked off the suction openings 5.
• the air flow band 10 forms in the direction of the suction openings 5 in each case a vortex surrounding the laser processing area 11, as shown in Fig. 2 for a flow half 10a and is not shown for the other flow half 10b.
• the laser processing unit 3 and the inflow opening 7 are each vertically movable (double arrows 20, 21), wherein the height position of the inflow opening 7 in dependence on the height position the laser processing unit 3 can be adjusted mechanically or control technology.
• the height position of the inflow opening 7 can then be adjusted via a control unit 22 as a function of the height position of the laser processing unit 3, machining parameters and / or the workpiece to be machined (dimensions, material,).
• the laser processing system 1 shown in FIG. 4 differs from the laser processing system of FIG. 1 only in that here the suction opening 5 is not transversely or laterally but in the direction of the air inflow belt 10 on the side of the workpiece support 2 opposite the inflow opening 7 Area of the vertical Umhausungsabitess 6 a is arranged.
• the suction opening 5 can alternatively be located on the (left) longitudinal side of the waste container 9 facing the air inflow strip 10.
• the suction opening 5 is arranged on the same side as the inflow opening 7 below the workpiece support 2 and is opened in the direction of the deflected air inflow tape 10.
• the suction opening 5 is preferably located on the (right) longitudinal side of the waste container 9 facing away from the deflected air inflow strip 10.
• a plurality of inlet openings 7 can be arranged at the same height next to each other, of which, for example, in the figures 1, 3, 4 and 5, only one can be seen, and a plurality of suction openings 5 are arranged at the same height side by side, of which in the Figures 1, 3, 4 and 5, only one can be seen.
• the inflow openings 7 and the suction openings 5 can be activated optionally or combined to form a differently wide and / or differently positioned flow band 10, specifically the suction openings 5, in particular depending on the respective activated air inflow openings 7 or vice versa, i.
• the activation of the respective openings 5, 7 can, for example, to the current position of the laser processing unit 3 or just with respect to the number of openings to be activated to the respective application, in particular with respect the process parameters and / or material selection, be knotted.
• the inflow openings 7 and the suction openings 5 can each be arranged in rows of different heights, which are then activated selectively or in combination to form a differently high or differently inclined flow band 10.

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

Applications Claiming Priority (2)

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• 2011
  • 2011-02-01 DE DE102011003426A patent/DE102011003426A1/de not_active Ceased
• 2012
  • 2012-02-01 EP EP12702971.8A patent/EP2670556A1/fr not_active Withdrawn
  • 2012-02-01 WO PCT/EP2012/000440 patent/WO2012104074A1/fr not_active Ceased
  • 2012-02-01 CN CN201280007392.3A patent/CN103338892B/zh active Active
  • 2012-02-01 DE DE202012013586.4U patent/DE202012013586U1/de not_active Expired - Lifetime
• 2013
  • 2013-08-01 US US13/956,549 patent/US20130313238A1/en not_active Abandoned

Non-Patent Citations (2)

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