WO2017126888A1 - 방향성 전기강판의 자구미세화 방법과그 장치 - Google Patents
방향성 전기강판의 자구미세화 방법과그 장치 Download PDFInfo
- Publication number
- WO2017126888A1 WO2017126888A1 PCT/KR2017/000617 KR2017000617W WO2017126888A1 WO 2017126888 A1 WO2017126888 A1 WO 2017126888A1 KR 2017000617 W KR2017000617 W KR 2017000617W WO 2017126888 A1 WO2017126888 A1 WO 2017126888A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- steel sheet
- laser
- laser beam
- irradiation
- oriented electrical
- Prior art date
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- 238000000034 method Methods 0.000 title claims abstract description 80
- 230000005381 magnetic domain Effects 0.000 title claims abstract description 46
- 229910001224 Grain-oriented electrical steel Inorganic materials 0.000 title claims abstract description 31
- 238000007670 refining Methods 0.000 title claims abstract description 4
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 421
- 239000010959 steel Substances 0.000 claims abstract description 421
- 238000004519 manufacturing process Methods 0.000 claims abstract description 19
- 230000008093 supporting effect Effects 0.000 claims abstract description 17
- 230000003287 optical effect Effects 0.000 claims description 77
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 76
- 229910052742 iron Inorganic materials 0.000 claims description 38
- 239000000428 dust Substances 0.000 claims description 34
- 230000001678 irradiating effect Effects 0.000 claims description 16
- 238000002347 injection Methods 0.000 claims description 13
- 239000007924 injection Substances 0.000 claims description 13
- 229910000976 Electrical steel Inorganic materials 0.000 claims description 10
- 238000007664 blowing Methods 0.000 claims description 7
- 238000005507 spraying Methods 0.000 claims description 7
- 238000002844 melting Methods 0.000 claims description 6
- 230000008018 melting Effects 0.000 claims description 6
- 230000005415 magnetization Effects 0.000 claims description 5
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 239000000356 contaminant Substances 0.000 claims description 3
- 238000012423 maintenance Methods 0.000 claims description 2
- 230000004941 influx Effects 0.000 claims 1
- 230000008569 process Effects 0.000 abstract description 27
- 238000012545 processing Methods 0.000 abstract description 4
- 230000005855 radiation Effects 0.000 abstract description 4
- 239000012670 alkaline solution Substances 0.000 description 15
- 238000005096 rolling process Methods 0.000 description 12
- 238000004140 cleaning Methods 0.000 description 9
- 238000001914 filtration Methods 0.000 description 8
- 239000000047 product Substances 0.000 description 8
- 230000000903 blocking effect Effects 0.000 description 6
- 230000004907 flux Effects 0.000 description 6
- 230000006872 improvement Effects 0.000 description 6
- 230000007423 decrease Effects 0.000 description 5
- 238000005259 measurement Methods 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 230000001976 improved effect Effects 0.000 description 4
- 238000000926 separation method Methods 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000003344 environmental pollutant Substances 0.000 description 3
- 239000003517 fume Substances 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 231100000719 pollutant Toxicity 0.000 description 3
- 238000000137 annealing Methods 0.000 description 2
- 238000011109 contamination Methods 0.000 description 2
- 238000005530 etching Methods 0.000 description 2
- 239000012467 final product Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000009751 slip forming Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 206010043268 Tension Diseases 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000003416 augmentation Effects 0.000 description 1
- 230000003190 augmentative effect Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000011162 core material Substances 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000010297 mechanical methods and process Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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
- B23K26/16—Removal of by-products, e.g. particles or vapours produced during treatment of a 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
- B23K26/352—Working by laser beam, e.g. welding, cutting or boring for surface treatment
- B23K26/354—Working by laser beam, e.g. welding, cutting or boring for surface treatment by melting
-
- 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
- B23K26/0006—Working by laser beam, e.g. welding, cutting or boring taking account of the properties of the material involved
-
- 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
- B23K26/035—Aligning 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
- B23K26/08—Devices involving relative movement between laser beam and workpiece
- B23K26/083—Devices involving movement of the workpiece in at least one axial direction
- B23K26/0838—Devices involving movement of the workpiece in at least one axial direction by using an endless conveyor belt
- B23K26/0846—Devices involving movement of the workpiece in at least one axial direction by using an endless conveyor belt for moving elongated workpieces longitudinally, e.g. wire or strip material
-
- 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
- B23K26/083—Devices involving movement of the workpiece in at least one axial direction
- B23K26/0853—Devices involving movement of the workpiece in at least in two axial directions, e.g. in a plane
-
- 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
- B23K26/12—Working by laser beam, e.g. welding, cutting or boring in a special atmosphere, e.g. in an enclosure
- B23K26/127—Working by laser beam, e.g. welding, cutting or boring in a special atmosphere, e.g. in an enclosure in an enclosure
-
- 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
- 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
- B23K26/352—Working by laser beam, e.g. welding, cutting or boring for surface treatment
- B23K26/359—Working by laser beam, e.g. welding, cutting or boring for surface treatment by providing a line or line pattern, e.g. a dotted break initiation line
-
- 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
- B23K26/362—Laser etching
- B23K26/364—Laser etching for making a groove or trench, e.g. for scribing a break initiation groove
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/70—Auxiliary operations or equipment
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D10/00—Modifying the physical properties by methods other than heat treatment or deformation
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
- C21D8/1277—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties involving a particular surface treatment
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
- C21D8/1294—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties involving a localized treatment
Definitions
- the present invention relates to a method for minimizing magnetic domain of a grain-oriented electrical steel sheet and a device for irradiating a laser to the grain-oriented electrical steel sheet to permanently refine the magnetic domain of the steel sheet.
- oriented electrical steel sheets having magnetic properties having low iron loss and high magnetic flux density are required.
- the magnetic domain micronization method can be broadly classified into temporary magnetic domain micronization and permanent magnetic domain micronization depending on whether the magnetic domain minimization improvement effect is maintained after the removal of the annealing.
- Temporary magnetic micronization method has a disadvantage in that the magnetic micronization effect is lost after stress relief annealing.
- the temporary magnetic domain miniaturization method makes the domains finer by forming a localized compression force portion on the surface of the steel sheet.
- this method requires recoating because it causes damage to the insulating coating layer on the surface of the steel sheet, and has a disadvantage in that manufacturing cost is high because the micronizing treatment is performed in an intermediate process instead of the final product.
- Permanent magnetization can maintain the iron loss improvement after heat treatment.
- a technique using an etching method, a roll method, or a laser method is mainly used.
- the etching method it is difficult to control the depth or width of the groove formation, it is difficult to guarantee the iron loss characteristics of the final product, and it is not environmentally friendly because the acid solution is used.
- the stability, reliability, and process of machining are complicated.
- the magnetic domain can be refined by forming a molten groove on the surface of the steel sheet by irradiating a laser beam on the surface of the steel sheet while supporting the steel sheet and adjusting the tension.
- miniaturizing magnetic domains using a laser a more effective process improvement and optimization is required to enable high-speed processing and to lower iron loss and increase magnetic flux density of electrical steel sheets.
- the present invention provides a method and apparatus for magnetizing microstructured grain-oriented electrical steel sheet which can increase the micronized efficiency and improve workability to increase processing capacity.
- the present invention provides a method and apparatus for magnetizing microstructured grain-oriented electrical steel sheet, which are generated by laser irradiation to effectively remove spatters falling on the surface of a steel sheet.
- the present invention provides a method and apparatus for fine-grained grain-oriented electrical steel sheet which can effectively remove contaminants such as heel-up and spatter formed by laser irradiation to improve product quality.
- the present invention provides a method and apparatus for magnetizing fine grains of a grain-oriented electrical steel sheet to improve the iron loss improving efficiency and minimize the decrease in magnetic flux density.
- a method and apparatus for magnetizing a grain-oriented electrical steel sheet capable of providing an optimal operating environment required for a process.
- the laser irradiation step of forming a groove in the, and after the laser irradiation may include a removing step of removing the remaining spatter falling on the surface of the steel sheet.
- the removing step may include a step of blowing air to the surface of the steel sheet to blow the spatter apart from the steel sheet, and a suction step of sucking and treating the spatter removed from the steel sheet by air.
- the removing step may further include a covering step of covering the upper portion of the steel sheet along the moving direction of air with respect to the steel sheet to block the blowing of the spatter and guide the spatter.
- the laser beam irradiation position when the irradiation direction of the laser beam passes through the central axis of the steel sheet support roll with respect to the surface of the steel sheet which is brought into contact with the surface of the steel sheet in an arc shape is set as the reference point.
- the laser beam can be irradiated at a position spaced from the center along the outer circumferential surface of the steel plate support.
- the steel sheet support may be irradiated in a range of 3 to 7 0 along the outer circumferential surface from the center.
- the magnetic domain miniaturization method may further include a setting maintenance step of setting and maintaining an internal operating environment of the laser room where the laser irradiation is performed.
- the magnetic domain refinement method may further include a tension control step of applying tension to the steel sheet to maintain the steel sheet in a flat unfolded state.
- the magnetic domain miniaturization method may further include a meandering control step of allowing the steel sheet to move without shifting from side to side along the center of the production line.
- the setting and maintaining step may include blocking the inflow of external pollutants by isolating the inside of the laser room from the outside, and controlling the temperature, pressure, and humidity inside the laser room.
- the magnetic domain miniaturization method may further include a post-treatment step for removing heel up and spatter formed on the surface of the steel sheet through a laser irradiation step.
- the post-treatment step may include a brush step of removing the heel and spatter on the surface of the steel sheet with a brush.
- the post-treatment step is a clean step of electrolytically reacting the steel sheet with an alkaline solution to further remove heel up and spatter remaining on the surface of the steel sheet;
- the method may further include a filtering step for filtering out the alkaline solution.
- the width center of the steel sheet is located at the center of the production line.
- Meandering measurement step for measuring the deviation meandering amount, and meandering of the steel sheet by adjusting the direction of movement of the steel sheet by rotating and moving the axis of the steering (Steering Roll) according to the meandering amount of the steel sheet measured in the meandering amount measuring step It may include a meandering amount control step of controlling the amount.
- the meandering amount control step may control the meandering amount of the steel sheet within ⁇ lmm.
- Steel sheet tension applying step for applying tension to the steel sheet by Rol l
- steel sheet tension for measuring the tension of the steel sheet subjected to the steel sheet tension applying step
- the steel sheet tension control step of controlling the steel sheet tension by adjusting the speed of the tension bridle in accordance with the measurement step, and the tension of the steel sheet measured in the steel sheet tension measurement step.
- the position adjustment step of the steel plate support a steel plate support step of supporting the steel plate in the laser irradiation step as a steel plate support, a brightness measurement step of measuring the brightness of the flame generated when laser irradiation to the steel sheet in the laser irradiation step, And adjusting the position of the steel plate support by the position control system according to the brightness of the flame measured in the brightness measuring step to control the steel plate support to position the steel plate within the depth of focus of the laser. It may include.
- the laser irradiation step is irradiated to the surface of the steel sheet by the optical system receiving the laser beam irradiated from the laser oscillator to the upper width, lower width and depth of each 70; Within a range of 1.0 to 5.0 J / miif, which is required for melting the steel sheet, to form a groove of 3 to 30 m and to leave a recess in the groove inner wall of the molten portion when the laser beam is irradiated. It may include a laser irradiation and energy transfer step to deliver to the steel sheet.
- the laser oscillator is turned on by a laser oscillator controller to operate the laser oscillator under normal working conditions, and the laser oscillator is turned off when the steel sheet has a meandering amount of 15 ⁇ or more. It may include a laser oscillation control step.
- the laser oscillator is a single mode (Single mode) It can oscillate continuous wave laser beam.
- the optical system may control the laser scanning speed to adjust the interval of the laser beam irradiation line to 2 to 30 mW in the rolling direction.
- the laser irradiation step may further include an angle conversion step of converting an irradiation line angle of the laser beam irradiated onto the surface of the steel sheet.
- the irradiation angle of the laser beam with respect to the width direction of the steel sheet can be converted into a range of ⁇ 4 °.
- the laser irradiation step may further include a dust collecting step of sucking and removing fumes and molten iron generated during laser beam irradiation.
- the dust collecting step may include a spraying step for removing the molten iron remaining in the grooves by spraying compressed dry air into the grooves of the steel sheet.
- the laser irradiation step is the scattered light and heat of the laser beam
- It may further include a blocking step for blocking the flow into the optical system of the irradiation facility.
- a steel plate support for controlling the up and down position of the steel plate while supporting the steel plate moving along the production line is irradiated with a positioning device and a laser beam to melt the steel plate to form grooves on the surface of the steel plate.
- Laser irradiation equipment, and remaining on the surface of the steel sheet after laser irradiation is irradiated with a positioning device and a laser beam to melt the steel plate to form grooves on the surface of the steel plate.
- It may include a removal unit for removing the spatter.
- the removal unit may include an air injection unit for blowing air away from the steel plate by injecting air onto the steel plate surface, and a suction hood for sucking and treating the spatter removed from the steel plate by the air injected from the air injection unit.
- the removing unit may further include a cover member which covers the upper portion of the steel sheet along the moving direction of air with respect to the steel sheet between the air spraying unit and the suction hood to block the flying of the spatter and guide the moving spatter by air.
- the laser irradiation equipment is a laser beam irradiation position when the irradiation direction of the laser beam passes through the central axis of the steel sheet support roll with respect to the surface of the steel sheet which is in contact with the surface of the steel sheet in an arc shape,
- the laser beam may be irradiated at a position spaced at an angle along the outer circumferential surface of the steel sheet support at the reference point.
- the laser irradiation facility may be a structure for irradiating a laser beam in the range of 3 to 7 0 spaced apart from the center around the steel plate support with respect to the reference point along the outer peripheral surface. It may further include a laser room that accommodates the steel sheet support roll position adjusting device and the laser irradiation equipment from the outside and provides an operating environment for laser irradiation.
- the steel sheet may further include a tension control device for imparting tension to the steel sheet to maintain the flat unfolded state.
- It may further comprise a meandering control system which allows the steel sheet to move freely from side to side along the production line augmentation.
- the laser room is located in the laser irradiation equipment and the steel plate support
- An internal space is formed to accommodate the control equipment and to be isolated from the outside.
- Inlet and outlet are formed at both sides along the traveling direction of the steel plate, and a positive pressure device for increasing the pressure inside the laser room than the outside, and Optical system that separates the upper space where the optical system is located from the lower space where steel sheet passes
- the lower frame and a constant temperature and humidity controller for controlling the temperature and humidity inside the laser room.
- It may further include a post-treatment facility for removing the heel up (hi 11 up) and the spatter (spatter) formed on the surface of the steel sheet.
- the aftertreatment facility may include a brush disposed at the rear end of the laser room to remove heel up and spatter of the steel plate surface.
- the post-treatment facility is disposed at the rear end of the brush roll and electrolytically reacts the steel sheet with the alkaline solution to further remove the heel up and spatter remaining on the surface of the steel sheet, and is connected to the cleaning unit and included in the alkaline solution of the cleaning unit. It may further include a filtering unit for filtering foreign matter from the alkaline solution.
- the meandering control equipment is a steering line for changing the moving direction of the steel sheet (Steering Roll), the center width of the steel sheet production line
- a meander measuring sensor for measuring the deviation from the center (measuring amount), and a steel sheet center position control system for adjusting the direction in which the steel sheet moves by rotating and moving the axis of the steering according to the output value of the meander measuring sensor (Strip Center Posit) ion control system).
- the tension control device is a tension bridle (Tens ion Br idle Rol l) for inducing movement while applying tension to the steel sheet, a steel plate tension measuring sensor for measuring the tension of the steel sheet passed through the tension bridle, and A steel sheet (Str ip) tension control system for adjusting the speed of the tension bridle according to the tension of the steel sheet measured by the steel sheet tension measuring sensor.
- the steel sheet support roll position adjusting device a steel plate support roll for supporting the steel sheet at the laser irradiation equipment position, a brightness measuring sensor for measuring the brightness of the flame generated when the laser irradiation to the steel sheet in the laser irradiation equipment, and the brightness measurement
- the steel sheet support for controlling the position of the steel sheet support roll according to the brightness of the flower measured by the sensor may include a position control system.
- the laser irradiation equipment is a laser oscillator for oscillating a continuous wave laser beam, the laser beam oscillated from the laser oscillator irradiates the surface of the steel sheet, the upper width, lower width and depth of each within 70 / ffli, within 10 / im, It includes an optical system for transmitting the laser energy density within the range of 1.0 to 5.0 J / mrf required for melting the steel sheet to form a groove of 3 to 30 and at the same time to produce a re-embossed portion remaining on the inner wall of the groove of the molten portion during laser irradiation. can do.
- the laser irradiation apparatus may further include a laser oscillator controller for controlling the laser oscillator to an off state when the laser oscillator is turned on under normal working conditions and the steel sheet running amount is 15 mra or more.
- the laser oscillator may oscillate a single mode continuous wave laser beam.
- the optical system may control the laser scanning speed to adjust the interval of the laser irradiation line to 2 to 30 mm along the rolling direction.
- the laser irradiation facility may have a structure in which an optical system for irradiating a laser beam onto a steel sheet is rotatable by a driving unit, and rotates with respect to the optical steel sheet to convert the angle of irradiation of the laser beam in the width direction of the steel sheet.
- the laser irradiation facility may further include a shielding unit for blocking laser scattered light and heat from entering the optical system.
- the laser irradiation equipment may further include molten iron removal equipment for removing the humb and spatter generated by laser beam irradiation on the steel sheet.
- the molten iron removal equipment may include an air knife for removing the molten iron remaining in the groove by injecting compressed dry air into the groove of the steel sheet, and a dust collecting hood for sucking and removing the molten iron and molten iron.
- the dust collection hood is separated from the body and the body is disposed separated from the body and the front end comprises an inlet, the connecting portion connecting the body and the head and the head is movable, the working condition
- the dust collecting hood further includes a support installed on the side of the head and having an extended slit, and a support bolt that spans the support and passes through the slit and is bolted to the lower portion of the optical system, and tightens or loosens the support bolt up and down. It may be a structure to move.
- the magnetic domain miniaturization process is stably performed by laser, and the iron loss improvement rate before and after heat treatment of the electrical steel sheet is 5% or more and 10%, respectively. You can secure more.
- FIG. 1 is a view schematically showing the configuration of a magnetic domain micronizing device of a grain-oriented electrical steel sheet according to the present embodiment.
- Figure 2 shows a magnetic domain micronized steel sheet according to this embodiment
- FIG. 3 is a schematic diagram showing an optical system configuration of a laser irradiation apparatus provided with a blocking unit according to the present embodiment.
- FIGS. 4 and 5 are schematic diagrams showing the configuration of a dust collecting hood installed under the optical system according to the present embodiment.
- FIG. 6 is a schematic diagram illustrating a spatter removing unit according to the present embodiment. [Best form for implementation of the invention]
- the present embodiment will be described by way of example as a facility for permanent magnetization of the grain-oriented electrical steel sheet used in the transformer core material.
- FIG. 1 is a magnetic domain micronized device of a grain-oriented electrical steel sheet according to the present embodiment It is shown schematically, and FIG. 2 shows a steel plate subjected to magnetic domain refinement according to the present embodiment.
- the rolling direction or the steel plate moving direction means the X-axis direction in FIG. 2, and the width direction is a direction perpendicular to the rolling direction.
- reference numeral 31 denotes an irradiation line which is dug into a groove by a laser beam and is continuously formed on the surface of the steel sheet 1.
- the magnetic domain micronizing apparatus of the grain-oriented electrical steel sheet according to the present embodiment stably performs the permanent magnetic domain refinement even when the steel sheet 1 proceeds at a high speed of 2 m / s or more.
- It may include a removal unit for removing the remaining spatter.
- the magnetic domain micronizing device may include a laser room 20 that accommodates the steel plate support isolating position control equipment and laser irradiation equipment from the outside and provide an operating environment for laser irradiation.
- the magnetic domain micronizing device may further include a tension control device for imparting tension to the steel sheet so that the steel sheet is kept flat and unfolded.
- the magnetic domain micronizing device may further include a meander control device for moving the steel plate without bias left and right along the center of the production line.
- the magnetic domain refiner may further include a post-treatment facility for removing heel up and spatter formed on the surface of the steel sheet according to the laser beam irradiation.
- Heal up is when the laser beam is irradiated on the surface of the steel sheet to form grooves.
- Spatter refers to molten iron that is generated upon laser beam irradiation and is raised on the surface of the steel sheet.
- the meandering control equipment is for changing the moving direction of the steel sheet (1).
- the meander measuring sensor 4 is disposed at the rear end of the steering roll 2B to detect the actual meandering amount of the steel sheet which has passed through the steering roll in real time.
- the steel sheet is moved straight along sidelines of the production line without bias, thereby forming a defect on the surface of the steel sheet over the entire width of the steel sheet.
- the meandering amount of the steel sheet is measured by the meander measuring sensor 4 in a step before forming the steel sheet surface grooves by laser irradiation.
- the value measured by the meander measuring sensor (4) is output to the steel sheet central position control system, and the steel plate augmented position control system calculates the output value of the meander measuring sensor to rotate the axes of the steering rolls (2A, 2B) according to the calculated meandering degree. Will be moved. In this way, the steering directions 2A and 2B are rotated and moved to adjust the moving direction of the steel plate wound and moved on the steering.
- the meandering amount of the steel sheet can be controlled to control the meandering amount of the steel sheet 1 within ⁇ 1 kPa.
- the tension control device applies a tension of a constant size to the steel sheet (1).
- TBR TBR
- steel plate tension measuring sensor (7) for measuring the tension of the steel sheet (1) passing through the tension bridle, and the steel sheet (1) measured by the steel sheet tension measuring sensor (7)
- Steel plate (Str ip) tension control system 6 for adjusting the speed of the tension bridal roll (5A, 5B) in accordance with the tension of the.
- the steel sheet tension measuring sensor 7 is arranged in the rear end of the tension bridle (5B) to measure the actual tension of the steel sheet subjected to tension through the tension bridal (5B) in real time.
- the tension of the steel sheet is too excessive while making the steel plate surface shape flat at the laser irradiation position of the laser irradiation equipment.
- the tension may be set so that breakage of the steel sheet does not occur.
- the tension control equipment uses the tension bridle by the steel sheet (Str ip) tension control system 6 according to the tension of the steel sheet measured by the steel sheet tension measuring sensor 7.
- Rol l Adjust the speed of TBR) (5A, 5B).
- the steel sheet that has passed through the tension control equipment is introduced into the laser room 20 to be finely processed through the steel plate supporting roll position adjusting device and the laser irradiation facility, and then to the outside of the laser room 20.
- the laser room will be described later.
- a steel sheet support roll 9 is disposed directly under the laser irradiation equipment, and deflectors (Def lector Roll) 8A and 8B are disposed on both sides with the steel sheet support interposed therebetween. ) Is placed.
- the moving direction of the steel sheet 1 is switched so that the deflector is directed to the steel plate support 9 by Deflector Rol 8A and 8B.
- Deflector Rol 8A and 8B As the steel sheet 1 passes through the deflector 8A, the direction of movement of the steel plate support is shifted toward (9), the steel plate support is brought into contact with (9), and then the deflector is turned toward 8B, and the deflector roll 8B Is moved past.
- the steel sheet 1 is wound in the shape of an arc along the steel plate support 9 to pass through the steel plate support while being in surface contact with it.
- the steel sheet In order to minimize the laser beam focal length fluctuation caused by the vibration and wave of the steel sheet when irradiating the laser beam, the steel sheet must pass through the plate support in full contact with the steel sheet, and in this state, the laser beam is applied to the steel sheet running along the steel plate support. You should investigate.
- the laser beam can be accurately irradiated onto the sheet.
- the steel plate support positioning device the steel plate support for supporting the steel sheet (1) to the laser irradiation position of the laser irradiation equipment (9), the brightness of the flame generated when the laser irradiation to the steel sheet (1) in the laser irradiation equipment
- the steel plate supporting position adjusting equipment supports the steel sheet 1 to the laser irradiation part position by the steel sheet supporting (9), and the laser steel sheet irradiation efficiency is high.
- the brightness of the flame generated when the laser is irradiated to the steel sheet is measured by using the luminance measuring sensor (10).
- the steel plate support position adjusting device is for measuring the actual distance between the surface of the steel sheet from the optical system of the laser irradiation equipment
- the control system 12 is connected with the brightness of the flame detected from the luminance sensor 10.
- the distance between the optical system and the steel plate surface actually measured from the distance measuring sensor 11 is calculated to more precisely control the position of the steel plate supporting roll 9.
- the meandering control device, the tension control device and the steel plate supporting position adjusting device serve to create a steel sheet condition at the laser irradiation position so that the laser groove can be precisely formed on the steel sheet by the laser irradiation facility.
- the steel sheet In the laser irradiation position, the steel sheet should be in the center position of the production line and the distance from the optical system should be maintained at the set value.
- the laser irradiation apparatus may include a laser oscillator controller 13, a laser oscillator 14 for oscillating the continuous wave laser beam 16, and an optical system 15. As shown in FIG. 3, the optical system 15 is rotatably installed to provide an angle of the laser beam irradiation line with respect to the steel plate width direction.
- Header 37 for installing the plate 37, the drive unit 36 for rotating the mod plate 37, the laser plate installed in the mode plate 37 and applied from the laser oscillator 14 into the optical system 15 (39), a polygon mirror (32) rotatably mounted on the mode plate (37) for reflecting the laser beam emitted from the header (39), a rotation motor (33) for rotationally driving the polygon mirror (32), and A condensing mirror 35 which is installed in the mode plate 37 and reflects the laser beam 16 reflected from the polygon mirror 32 toward the steel sheet and condenses on the steel sheet, and is connected to the condensing mirror 35 to condense mirror 35 Of the laser beam
- a drive motor 34 for adjusting a focal length and a shutter 38 installed at the mode plate 37 may selectively block the mode plate 37 according to whether or not the laser beam is irradiated.
- the optical system 15 forms a body in which a header 39, a polygon mirror 32, a condenser mirror 35, and a shutter are arranged in a mode plate 37 constituting an optical box.
- the laser oscillator 14 and the header 39 are connected by an optical cable 41, for example. Accordingly, the laser from the laser oscillator 14 is sent to the header 39 via the optical cable 41.
- the header 39, the polygon mirror 32 and the condensing mirror 35 are disposed in position to reflect the laser beam 16 to a desired position.
- the header 39 may be disposed on both sides with the polygon mirror 32 interposed therebetween, and each may emit a laser beam toward the polygon mirror 32.
- Two condensing mirrors 35 are arranged for each laser beam reflected from the polygon mirror 32. The laser beam emitted from the header 39
- the condensing mirror 35 Reflected by the rotating polygon mirror 32 in accordance with the drive of the rotary motor 33 is sent to the condensing mirror 35.
- the laser beam 16 reflected by the condenser mirror 35 is reflected from the condenser mirror 35 through the shutter 38 toward the steel sheet and is concentrated on the surface of the steel sheet 1. Accordingly, the laser beam is periodically irradiated on the surface of the steel sheet to form a continuous groove in the width direction.
- the overall focal length of the laser beam 16 by the optical system 15 is adjusted by the vertical movement of the steel sheet support roll 9, and the misalignment of the left and right focal lengths is driven by the driving motor 34 connected to the condensing mirror 35. Adjusted by).
- the shutter 38 is installed below the mode plate 37 to open and close the mode plate 37. The shutter 38 is opened when the laser beam is irradiated downwardly from the condensing mirror 35 to prevent interference with the laser beam, and is closed when the laser beam is not irradiated so that external humes or foreign substances enter the optical system 15. Block incoming
- the laser oscillator controller 13 is normal Under the working conditions, the laser oscillator is turned on and if the steel sheet travels more than 15mm, the laser oscillator is controlled to the off state.
- the laser oscillator 14 may oscillate a single mode continuous wave laser beam and transmit it to the optical system 15.
- the optical system 15 irradiates the steel sheet surface with the transmitted laser beam 16.
- the laser oscillator 14 and the optical system 15 irradiate the surface of the steel sheet with a laser beam to form grooves having an upper width, a lower width and a depth of less than 70 / m, less than 10 mi, and 3 to 30, respectively.
- the laser energy density in the range of 1.0 to 5.0 J / raf necessary for melting the steel sheet can be transmitted to the steel sheet so that re-solidification portion remaining on the inner wall of the groove of the molten portion during irradiation is generated.
- the optical system 15 has a function of controlling the laser scanning speed so that the interval of the laser irradiation line (31 in FIG. 2) can be adjusted to 2 to 30 mm in the rolling direction. Therefore, the iron loss of the steel sheet can be improved by minimizing the influence of the heat affected zone (HAZ, Heat Affected Zone) by the laser beam.
- HZ Heat affected Zone
- the laser irradiation facility may be a structure for converting the angle of the irradiation line of the laser beam irradiated on the surface of the steel sheet with respect to the width direction of the steel sheet.
- the laser irradiation equipment can convert the angle of irradiation of the laser beam in the range of ⁇ 4 ° with respect to the width direction of the steel sheet.
- the laser irradiation equipment is composed of a structure in which the optical system 15 for irradiating a laser beam to the steel sheet is rotatable by the drive unit 36, converting the angle of the irradiation line of the laser beam formed on the surface of the steel sheet relative to the width direction of the steel sheet It may be a structure.
- the irradiation line angle of the laser beam by the optical system is converted in this manner, the irradiation line 31 by the laser beam is inclined in a range of ⁇ 4 ° in a direction perpendicular to the rolling direction of the steel sheet. Therefore, it is possible to minimize the decrease in magnetic flux density due to the groove formation by the laser.
- the laser irradiation equipment controls the irradiation position of the laser beam to the steel sheet 1, to prevent the back reflection phenomenon that the laser beam irradiated on the steel sheet is reflected from the steel sheet and enters the optical system or the laser oscillator It is structured.
- the irradiation direction of the laser beam irradiated from the optical system 15 is directed to the surface of the steel sheet which is brought into contact with the surface of the steel sheet in the form of an arc.
- a separation angle R Angle along the outer circumferential surface at the center of the steel plate support roll 9 from the reference point P, with the laser beam irradiation position when passing through the central axis as the reference point P (hereinafter referred to as a separation angle R for convenience of explanation) It may be a structure for irradiating the laser beam in the spaced apart position.
- the reference point P is a point where the line passing through the central axis of the steel plate support (9) meets the steel plate in FIG. 3. Irradiation direction of the laser beam is the
- the laser beam When passing through the central axis, the laser beam is focused on the reference point P.
- the direction of irradiation of the laser beam is perpendicular to the steel plate support at the reference point P (9), the back reflection phenomenon in which the laser beam reflected by the steel sheet enters the optical system and the laser oscillator as it is, causes damage. Is generated.
- the laser irradiation apparatus irradiates the laser beam at a position spaced apart from the reference point P by the separation angle R, such that the laser beam reflected from the steel sheet is not incident on the optical system. Therefore, the above back reflection phenomenon can be prevented and the quality of the groove shape formed by the laser beam can be maintained.
- the separation angle R may be set in the range of 3 to 7 ° along the outer circumferential surface at the center of the steel plate support (9) with respect to the reference point (P).
- the separation angle R which is the position where the laser beam is irradiated, is smaller than 3 °, a part of the laser beam reflected back from the steel sheet may flow into the optical system or the laser oscillator.
- the spacing angle (R) is not carried out may occur if more than a 70 properly groove formed by the laser beam to form defects in the home.
- the laser irradiation apparatus of the present embodiment irradiates a laser beam to the steel sheet at a point angularly spaced from the reference point ⁇ , thereby preventing back reflection phenomenon and not interfering with the incident optical path when the laser beam is reflected.
- the quality of the groove shape formed by this can be stably maintained.
- the laser irradiation equipment may further include molten iron removal equipment for removing fumes and spatters generated by laser beam irradiation on the steel sheet.
- the molten iron removal equipment sprays compressed dry air into the grooves of the steel sheet to remove an air knife (17) for removing the molten iron remaining in the grooves, and a dust collecting hood (19A, 19B) for sucking and removing the fume and molten iron. It may include. remind
- the air knife 17 blows compressed dry air having a constant pressure Pa into the groove of the steel plate 1 to remove the molten iron remaining in the groove.
- the compressed dry air in the knife 17 preferably has a pressure Pa of at least 0.2 kg / cm 2 . This is because when the pressure of the compressed dry air is less than 0.2 kg / cm 2 , it is impossible to remove the molten iron in the groove, and thus the iron loss improvement effect cannot be obtained.
- the scratches and spatters removed by the air knife are removed by the dust collection hoods 19A and 19B disposed before and after the laser irradiation position.
- the laser irradiation equipment may further include a shielding portion 18 for blocking the reflected light, scattered light and radiant heat of the laser beam from entering the optical system.
- the shield 18 blocks the reflected light and scattered light introduced into the optical system by the reflection and scattering of the laser beam 16 irradiated onto the steel sheet,
- the dust collection hoods 19A and 19B may have a structure for adjusting the dust collection position appropriately according to the working conditions.
- the dust collection hood needs to be in the proper position.
- the structure of the dust collection hood is illustrated.
- the dust collection hood 19AJL9B of this embodiment is separated from the body portion 191, the body portion 191 is spaced apart and the head portion 192 forming the inlet (194) ), A connecting portion 193 which connects between the body portion 191 and the head portion 192 and the head portion 192 is movably installed.
- the front-rear direction means the y-axis direction in FIG. 4.
- the vertical direction means the z-axis direction.
- the body portion 191, the head portion 192 and the connecting portion 193 are combined with each other to form a single dust collection hood (19A-19B).
- the body 191 may have a structure fixed on the installation.
- the connection portion 193 is tightly coupled between the body portion 191 and the head 192 so that no hull or spatter is leaked and there is no pressure loss.
- the head 192 is formed with an inlet 194 at the tip. remind
- the head 192 may be separated from the body 191 and moved forward and backward along the connecting portion 193.
- the head 192 is spaced apart from the body portion 191 by a predetermined distance. Accordingly, the head 192 is moved back and forth within the connecting portion 193 to move the position of the inlet 194 of the head 192, that is, the inlet 194 of the dust collection hoods 19A and 19B.
- the connecting portion 193 may be made of a structure that can be stretched by itself, for example, a bellows structure. Moving the head 192 is the bellows structure
- the dust collection hoods 19A and 19B are installed on the side of the head 192 and have a slit 196 extending therebetween, and are supported by the support 195 and past the slit 196 of the optical system. It may further include a support bolt (197) that is bolted to the bottom. Thus, by tightening or loosening the support bolt 197 to move the head 192 up and down, it is possible to change the position of the inlet (194) where the dust is collected according to the working conditions in the vertical direction.
- the head 192 may be installed under the optical system through the support 195 and the support bolt 197 to fix the position of the head 192 to the moved position.
- the support 195 is installed on both sides of the head 192
- the support bolt 197 extends along the front and rear direction in which the slit 196 is moved.
- the slit 196 has a head 192 when the head 192 moves in the front and rear directions The interference between the support 195 and the support bolt 197 is prevented from occurring.
- the head 192 is supported and fixed by the bolt head of the support bolt 197 spanning the support 195.
- the support bolt 197 When the support bolt 197 is tightened, the support bolt 197 pulls the support 195 to move the head 192 upward with respect to the optical system.
- the head 192 When the support bolt 197 is released, the head 192 is lowered by the weight of the optical system. Accordingly, the head 192 is moved up and down with respect to the connecting portion 193 to move the inlet 194 of the head 192, that is, the position of the inlet 194 of the dust collection hoods 19A and 19B.
- the connecting portion 193 has a flow space in the vertical direction to some extent therein, the head 192 is movable up and down without interference with the connecting portion 193.
- the connecting portion 193 itself is a flexible bending structure, for example, a flexible material or a bellows structure can be flexibly bent when moving the head 192 up and down and can prevent interference with the head 192. .
- FIG. 6 shows a removal unit according to the present embodiment.
- the removal unit removes the remaining spatter falling on the surface of the steel sheet after the laser beam irradiation on the steel sheet (1).
- the removing unit is disposed between the optical system 15 and the deflector 9B of the laser irradiation apparatus along the moving direction of the steel sheet, and then the steel sheet is moved to the deflector after laser irradiation. This removes the spatter that is attached to the surface.
- the removing part may include an air injection part 100 for blowing air to the surface of the steel plate 1 to blow spatters apart from the steel plate, and the air injection part from the steel plate by the air injected from the air injection part. And a suction hood 101 for sucking and treating the removed spatter.
- the removal unit covers the upper portion of the steel sheet along the moving direction of the air with respect to the steel sheet 1 between the air spraying unit 100 and the suction hood 101 to block the blowing of the spatter and guide the spatter moved by the air.
- More cover member 102 May include
- the air injection unit 100 and the suction hood 101 are disposed opposite to both side ends along the width direction of the steel sheet. Air injected from the air injection part 100 is sucked through the suction suction hood 101 in the width direction of the steel plate 1. In this process, the spatter remaining on the surface of the steel sheet 1 is moved to the suction hood by air and removed.
- the cover member 102 When injecting air through the air injection unit 100, the cover member 102 may be installed to cover the upper portion of the steel sheet (1).
- the cover member 102 may have a structure in which both front and lower ends thereof are opened in a steel plate width direction. Accordingly, the cover member 102 forms a passage communicating between the air spraying part 100 and the suction hood 101. Therefore, the air injected from the air injection unit 100 is
- the laser room 20 is a room structure having an internal space, and the laser irradiation equipment and the steel plate support are accommodated in the inside to accommodate the position control equipment.
- Inlets and outlets are formed at the inlet and outlet sides of the laser room 20 along the steel plate traveling direction.
- the laser room 20 is provided with a facility to block the inflow of pollutants so that the internal space is not contaminated by external dust or the like. To this end, the laser room 20 is to increase the internal pressure than the outside
- Positive pressure device (23) is provided.
- the positive pressure device 23 maintains the pressure inside the laser room 20 relatively higher than the external pressure. As a result, it is possible to prevent foreign substances from flowing into the laser room 20.
- air curtains 22A, 22B, 22C, and 22D are provided at the inlet and the outlet through which the steel sheet enters and exits. The air curtain forms a film by injecting air into the inlet and the outlet, which are the passages through which the steel sheet enters and exits the laser room 2Q, thereby preventing dust from entering through the inlet and the outlet.
- a shower booth 21 may be installed at a door that is an entrance and exit of the laser room 20. Can be. The shower booth 21 removes foreign substances from the body of the person coming into the laser room (20).
- the laser room 20 is a space in which a steel sheet sphere miniaturization process is performed by a laser beam, and it is necessary to minimize the change of the internal environment and maintain an appropriate environment.
- the laser room 20 is a steel sheet (1) is formed in the upper space in which the laser oscillator 14 and the optical system (15) of the laser irradiation equipment is located.
- the optical system lower frame 24 makes it possible to more thoroughly manage the main equipment operating environment, such as the laser oscillator 14 and the optical system (15).
- the optical system lower frame 24 is installed to separate the optical system lower space through which the steel sheet passes in the laser room 20 and the optical system upper space where the laser oscillator and the optical mirrors are located.
- the constant temperature and humidity controller 25 controls the temperature and humidity inside the laser room 20 to provide an appropriate environment.
- the constant temperature and humidity controller 25 may maintain the internal temperature of the laser room 20 at 20 to 25 ° C, and maintain the humidity at 50% or less.
- the internal space of the laser room 20 is continuously maintained at a temperature and humidity suitable for the working environment, so that the magnetic domain refinement process can be performed on the steel sheet in an optimal state. Therefore, it is possible to mass produce high quality products under the optimum operating environment required for the process.
- the magnetic domain refiner of the present embodiment may further include a post-treatment facility for removing heel up and spatter formed on the surface of the steel sheet.
- the post-treatment facility is disposed in the rear end of the laser room 20 along the steel plate moving direction to remove brush rolls 26A to 26B to remove heel-up and spatter of the steel plate surface. It may include.
- the brush rolls 26A and 26B are rotated at a high speed by the drive motor, and the current control system controls the current value of the drive motor generated during operation to a set target value, and the brush position is controlled by adjusting the distance between the brush and the steel sheet. The distance between the rotational speed and the steel sheet is controlled by the control system.
- the brush roll may be disposed on only one surface of the steel sheet in which the groove is formed by the laser beam, or may be disposed on both sides of the steel sheet.
- the brush rolls 26A and 26B are in close contact with the steel plate surface and rotate at a high speed to remove heel ups and spatters attached to the steel plate surface.
- a dust collection hood 19C for discharging the heel up and spatter removed by the brush in close proximity to the brush 26A, 26B is further provided.
- the dust collection hood 19C sucks molten iron such as heel up and spatter off the steel sheet by the brushes 26A and 26B and discharges them to the outside.
- the post-treatment facility is provided with a cleaning unit 29 disposed at the rear end of the brush 26A, 26B to electrolytically recoil the steel sheet with an alkaline solution to further remove heel up and spatter remaining on the surface of the steel sheet.
- the connection unit may further include a filtering unit 30 for filtering foreign matter contained in the alkaline solution of the cleaning unit from the alkaline solution.
- the steel sheet is first heelup and spatter is removed via the brush (26A, 26B), and the remaining heelup and spatter is removed secondly through the cleaning unit (29). Accordingly, the product quality can be improved by more completely removing the heel up and spatter attached to the steel plate surface.
- the cleaning unit 29 is filled with an alkaline solution inside, the filter unit 30 is connected to one side.
- the filtering unit 30 removes the heel and spatter contained in the alkaline solution while circulating the alkaline solution of the clean unit.
- the filtering unit 30 controls the iron content of the alkaline solution to 500 ppm or less by removing the heel up and the spatter. In this way, it is possible to prevent the degradation of the cleaning performance of the cleaning unit to process the steel sheet continuously.
- the steel sheet continuously transferred enters the laser room through the meandering control device and the tension control device, proceeds at a speed of 2 m / sec or more, and is processed to have a finer domain.
- the steel sheet entering the laser room is drawn out of the laser room after the permanent magnetization is processed through the laser irradiation equipment.
- the steel sheet drawn out of the laser room is passed through a post-treatment facility to remove heel ups and spatters remaining on the surface.
- the laser room where the laser irradiation on the surface of the steel sheet proceeds to properly set and maintain the internal operating environment so as to provide an optimal environment for miniaturization of magnetic domains.
- the laser room isolates the inside from the outside to block the inflow of external pollutants, and controls the internal brightness, pressure, and humidity of the laser room according to an operating environment for forming magnetic domains.
- the constant temperature and humidity controller installed in the laser room maintains the temperature inside the laser room at 20 to 25 ° C, humidity by 50% or less, thereby providing the optimum conditions for the magnetic domain micronizing treatment by laser irradiation.
- the laser room provides the optimum environment for the laser beam irradiation, and the steel sheet is accurately positioned at the laser irradiation position through the meander control device, the tension control device, and the steel plate support through the positioning device.
- the steel sheet is processed for merit refinement, the direction of movement is controlled through the meandering control equipment, so that the steel plate moves to the right and left along the center of the production line without bias.
- the meander measuring sensor continuously detects the meandering amount of the steel sheet, and when the steel sheet meanders, the signal detected by the meander measuring sensor is calculated to rotate and move the shaft of the steel plate central position control system to move the steel sheet to the correct position. . In this way, the steering is continuously By controlling, the steel sheet can be continuously moved without leaving the center of the production line.
- the steel plate moves past the steering and through the tension bridging for tension adjustment.
- the tension of the steel sheet past the tension bridal roll is detected by the tension measuring sensor.
- the steel plate tension control system calculates the measured value detected by the tension measuring sensor to control the speed of the tension bridal roll in response to the set tension. Accordingly, it is possible to continuously maintain the tension of the moved steel plate in the set range.
- the steel sheet passed through the tension bridle is introduced into the laser room through the entrance of the laser room.
- the steel sheet is turned in the laser room by the bridle and moved in close contact with the steel plate support positioned between the two bridals.
- the steel plate support moves the steel plate up and down to position the steel plate within the depth of focus of the laser beam.
- the luminance sensor detects the flame brightness on the surface of the steel sheet in real time
- the position control system According to the measured value detected by the measuring sensor, the position control system
- the steel plate support is moved up and down to position the steel plate within the depth of focus of the laser beam.
- the laser beam is effectively irradiated onto the surface of the steel sheet to form high-quality radiation.
- the laser oscillator controller turns on / off the laser oscillator according to the degree of meandering of the steel sheet.
- the laser oscillator controller is connected to the meander measuring sensor, and when the meandering amount of the steel sheet measured from the meander measuring sensor becomes 15 mm or more, for example, the laser oscillator is turned off (Of f) by determining that the steel sheet is deviated from the steel sheet supporting roll too much. . Accordingly, the steel sheet support is irradiated onto the surface of the steel sheet after the laser beam is meandered to prevent the roll from being damaged.
- the laser beam generated by the laser oscillator is irradiated to the surface of the steel sheet through the optical system.
- the laser oscillator oscillates and transmits the TEMoo continuous wave laser beam to the optical system.
- the optical system redirects the laser beam to direct the laser to the surface of the steel sheet.
- molten grooves are continuously formed on the surface of the steel sheet to refine the magnetic domains.
- a molten groove is formed along the irradiation line.
- the upper width, the lower width and the depth of each of the grooves of the upper width, lower width and depth of less than 70 / / m, 10 to 3 ⁇ 30 ⁇ by the laser-radiation at the same time to form a groove on the inner wall of the groove of the molten portion during laser irradiation.
- the laser oscillator and the optical system deliver the laser energy density within the range of 1.0 to 5.0 J / mrf necessary for melting the steel sheet to the steel sheet so that the remaining re-engraving portion is generated.
- the laser beam reflected back from the steel sheet is not incident to the optical system. Therefore, it is possible to prevent the back reflection phenomenon and maintain the quality of the groove shape formed by the laser beam because the incident light path of the laser beam is not interrupted by the reflected light.
- the optical system has a function of controlling the laser scanning speed so that the interval of the laser irradiation line can be adjusted with respect to the rolling direction.
- the optical system has a rotation function to change the angle of the laser irradiation line.
- by adjusting the distance of the laser irradiation line to 2 to 30mm in the rolling direction by the optical system can minimize the influence of the heat affected zone (HAZ, Heat Af fected Zone) by the laser beam to improve the iron loss of the steel sheet have.
- HZ Heat Af fected Zone
- the angle of the irradiation line of the laser beam irradiated to the surface of the steel sheet can be converted by the rotation of the optical system.
- the optical system may convert the irradiation angle of the laser beam into a range of ⁇ 4 ° with respect to the width direction of the steel sheet. That is, in FIG. 2, the radiation line 31 of the laser beam may be formed by inclining in the range of ⁇ 4 ° with respect to the y-axis direction. Accordingly, the irradiation line formed on the surface of the steel sheet may be inclined in the range of 86 to 94 ° with respect to the rolling direction. Thus, by forming the irradiation line inclined with respect to the y-axis direction, it is possible to minimize the decrease in magnetic flux density due to the formation of the groove by the laser.
- the scattered light and heat of the laser beam can be further blocked to be introduced into the optical system of the laser irradiation equipment.
- the magnetic domain micronization process is performed, and the magnetic domain micronized steel plate is continuously moved and discharged to the outside through the exit of the laser room.
- the remaining spatter falling on the surface of the steel sheet is removed from the surface of the steel sheet by removing the 2 flter.
- Air is sprayed on the surface of the steel sheet in the width direction of the steel sheet to blow out the remaining spatter on the surface of the steel sheet. Spatters blown off the surface of the steel sheet are sucked through the suction hood and removed.
- a cover member is covered on the upper portion of the steel sheet to cover the upper portion of the steel sheet, thereby preventing the spatter from flying out.
- the steel sheet discharged from the laser room is subjected to a post-treatment process to remove the heel up and spatter attached to the surface of the steel sheet.
- the steel sheet is over the the brush disposed in the "laser room outside, in close contact with the steel sheet are primarily removing the heel up and spatter by a brush which rotates at a high speed.
- the brushed steel sheet is secondarily passed through a clean unit, and the remaining heel up and spatter are finally removed through the electrolysis reaction between the steel sheet and the alkaline solution.
- the steel plate from which the heel up and the spatter are removed while passing through the clean unit is transferred to the post process.
- Table 1 shows the iron loss improvement rate of the grain-oriented electrical steel sheet by the groove formed on the surface of the steel sheet 0.27mra thickness by continuous wave laser beam irradiation according to this embodiment. As shown in Table 1, in the case of the magnetic domain micronized steel sheet through the present embodiment it can be seen that the iron loss is improved both after the laser irradiation, after the magnetic domain micronized and heat treatment.
- Support steel sheet 10 Luminance measuring sensor
- A, 19B, 19C Dust collection hood 20 : Laser room
- Irradiation line 32 polygon mirror
- Header 100 Air injection unit
- Suction hood 102 Cover member
- Body 192 Head
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- Soft Magnetic Materials (AREA)
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JP2018538570A JP6826605B2 (ja) | 2016-01-22 | 2017-01-18 | 方向性電磁鋼板の磁区細分化方法とその装置 |
EP17741654.2A EP3406743B1 (en) | 2016-01-22 | 2017-01-18 | Method for refining magnetic domains of grain-oriented electrical steel plates, and apparatus therefor |
US16/072,148 US11065720B2 (en) | 2016-01-22 | 2017-01-18 | Method for refining magnetic domains of grain-oriented electrical steel plates, and apparatus therefor |
CN201780007850.6A CN108699618B (zh) | 2016-01-22 | 2017-01-18 | 取向电工钢板的磁畴细化方法及其装置 |
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EP (1) | EP3406743B1 (ko) |
JP (1) | JP6826605B2 (ko) |
KR (1) | KR101739868B1 (ko) |
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EP3858461A4 (en) * | 2018-09-28 | 2021-12-01 | Posco | FOREIGN SUBSTANCE COLLECTION EQUIPMENT AND ELECTRIC STEEL SHEET MANUFACTURING PLANT INCLUDING THE SAME |
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KR101739865B1 (ko) * | 2016-01-22 | 2017-05-25 | 주식회사 포스코 | 방향성 전기강판의 자구미세화 방법과 그 장치 |
KR101739866B1 (ko) * | 2016-01-22 | 2017-05-25 | 주식회사 포스코 | 방향성 전기강판의 자구미세화 방법과 그 장치 |
WO2018117510A2 (ko) * | 2016-12-23 | 2018-06-28 | 주식회사 포스코 | 방향성 전기강판의 자구미세화 방법과 그 장치 |
JP7192575B2 (ja) * | 2019-03-01 | 2022-12-20 | 日本製鉄株式会社 | 溝加工装置 |
JP7311743B2 (ja) * | 2019-03-01 | 2023-07-20 | 日本製鉄株式会社 | 表面加工装置 |
KR102348569B1 (ko) | 2019-11-18 | 2022-01-06 | 주식회사 포스코 | 이물질 포집장치 및 이를 포함하는 전기강판 제조설비 |
JP7688316B2 (ja) | 2022-04-26 | 2025-06-04 | 日本製鉄株式会社 | レーザ加工装置及びレーザ加工方法 |
CN116100158A (zh) * | 2022-12-07 | 2023-05-12 | 广州必易激光科技有限公司 | 一种用于面料的激光打标系统及方法 |
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Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
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EP3858461A4 (en) * | 2018-09-28 | 2021-12-01 | Posco | FOREIGN SUBSTANCE COLLECTION EQUIPMENT AND ELECTRIC STEEL SHEET MANUFACTURING PLANT INCLUDING THE SAME |
JP2022501186A (ja) * | 2018-09-28 | 2022-01-06 | ポスコPosco | 異物捕集装置及びこれを含む電気鋼板の製造設備 |
JP7291211B2 (ja) | 2018-09-28 | 2023-06-14 | ポスコ カンパニー リミテッド | 異物捕集装置及びこれを含む電気鋼板の製造設備 |
US12138709B2 (en) | 2018-09-28 | 2024-11-12 | Posco Co., Ltd | Foreign substance collecting apparatus and electrical steel sheet manufacturing facility including same |
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JP6826605B2 (ja) | 2021-02-03 |
JP2019511629A (ja) | 2019-04-25 |
US20190054570A1 (en) | 2019-02-21 |
CN108699618B (zh) | 2020-09-15 |
EP3406743B1 (en) | 2022-01-05 |
EP3406743A1 (en) | 2018-11-28 |
EP3406743A4 (en) | 2018-11-28 |
CN108699618A (zh) | 2018-10-23 |
KR101739868B1 (ko) | 2017-05-25 |
US11065720B2 (en) | 2021-07-20 |
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