WO2013100353A1 - 전기강판 및 그 제조방법 - Google Patents
전기강판 및 그 제조방법 Download PDFInfo
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- WO2013100353A1 WO2013100353A1 PCT/KR2012/009642 KR2012009642W WO2013100353A1 WO 2013100353 A1 WO2013100353 A1 WO 2013100353A1 KR 2012009642 W KR2012009642 W KR 2012009642W WO 2013100353 A1 WO2013100353 A1 WO 2013100353A1
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- Prior art keywords
- steel sheet
- groove
- electrical steel
- laser
- irradiation
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- 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 of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
- C21D8/12—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B5/00—Non-insulated conductors or conductive bodies characterised by their form
- H01B5/002—Auxiliary arrangements
-
- 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
- B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
- B23K26/06—Shaping the laser beam, e.g. by masks or multi-focusing
- B23K26/073—Shaping the laser spot
- B23K26/0736—Shaping the laser spot into an oval shape, e.g. elliptic shape
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- 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
- B23K26/352—Working by laser beam, e.g. welding, cutting or boring for surface treatment
- B23K26/355—Texturing
-
- 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 of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
- C21D8/12—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
- C21D8/1277—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties involving a particular surface treatment
- C21D8/1288—Application of a tension-inducing coating
-
- 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 of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
- C21D8/12—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
- C21D8/1294—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties involving a localised treatment
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
- H01B1/02—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors mainly consisting of metals or alloys
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F3/00—Cores, Yokes, or armatures
- H01F3/02—Cores, Yokes, or armatures made from sheets
-
- 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
- C21D2201/00—Treatment for obtaining particular effects
- C21D2201/05—Grain orientation
Definitions
- the present invention relates to an electrical steel sheet, and more particularly, to a grain-oriented electrical steel sheet in which grooves are formed on the surface of the steel sheet by laser irradiation to refine the magnetic domain of the steel sheet.
- a grain-oriented electrical steel sheet is used as an iron core material of electrical equipment such as transformers, and a steel sheet having magnetic properties with low iron loss and high magnetic flux density is required to reduce power loss and increase efficiency of electrical equipment.
- a grain-oriented electrical steel sheet refers to a material having an aggregate structure (also called a 'goth aggregate structure') in which the ⁇ 110 ⁇ ⁇ 001> direction is oriented in the rolling direction through hot rolling and cold rolling and annealing processes.
- aggregate structure also called a 'goth aggregate structure'
- the ⁇ 110 ⁇ ⁇ 001> direction is excellent in magnetic properties as the degree of orientation thereof increases in an easy magnetization direction of iron.
- the magnetic domain miniaturization method can be classified into temporary magnetic domain miniaturization and permanent magnetic domain miniaturization according to the presence or absence of improvement of magnetic domain miniaturization effect by stress relief annealing. have.
- Temporary magnetic domain miniaturization method is a domain micronization technique that refines the domain by forming 90 o domains to minimize the magnetic elastic energy generated by applying local compressive stress to the surface by thermal or mechanical energy.
- Temporal magnetic micronization techniques include laser magnetic domain miniaturization, ball scratching, and magnetic domain miniaturization by plasma or ultrasonic waves, depending on the energy source that refines the domain.
- Permanent domain refinement method which can maintain the iron loss improvement effect after heat treatment can be divided into etching method, roll method and laser method.
- Etching method is difficult to control groove shape (groove width, groove depth) because the groove is formed on the surface of steel sheet by electrochemical corrosion reaction in acid solution in solution. ), It is difficult to guarantee the iron loss characteristics of the final product because it forms grooves, and it is not environmentally friendly because acid solution is used.
- Permanent magnetization by rolls is processed by forming projections on the roll to form grooves with a certain width and depth on the surface of the steel sheet by pressing, and recrystallization of the bottom of the grooves by annealing the steel sheet after permanent magnetization.
- the stability, reliability, and process of machining are complicated.
- Permanent domain miniaturization by pulse laser suppresses the formation of the molten part because grooves are formed by vapor deposition. Therefore, it is difficult to secure iron loss improvement before heat treatment (stress removal annealing, SRA). Not only maintain but also has the disadvantage that the processing speed of the steel plate can not be processed at high speed.
- the present invention has been made to solve the above problems, and forms a groove by irradiating a continuous wave laser beam on the surface of a directional electrical steel sheet, and forms a solidified portion of molten metal on the sidewall (inner wall surface) of the groove to form a solidified portion before and after heat treatment.
- the present invention relates to a method for miniaturizing magnetic domains of a grain-oriented electrical steel sheet having improved iron loss improvement rate.
- the electrical steel sheet according to an embodiment of the present invention is a groove (groove) formed to have a first side and a second side and a bottom surface facing each other on a steel sheet and the first, second side and
- the solidification portion formed by solidifying the molten by-product of the steel sheet in the groove forming process on the bottom surface is removed, characterized in that it has an opening that exposes at least one surface of the first, second side and bottom surface.
- the solidification portion formed on the first side surface or the second side surface defines at least 2% of the side distance when defining the side distance C as the distance from the boundary of the steel plate to the center of the bottom surface of the groove. It is characterized by occupying.
- the groove shape factor when defining the groove shape factor to the depth (D G ) / lower half width (W 1 ) of the groove, the groove forming factor, characterized in that 0.1 to 9.0.
- the depth D G of the groove is a distance from the surface of the steel sheet to the bottom surface
- the lower half width W 1 is 1/2 of the length of the steel sheet width direction of the bottom surface.
- the width of the groove may be 10 ⁇ 70 ⁇ m.
- the depth of the groove may be 0.5 ⁇ m or less.
- the thickness range of the solidification part may be 0.05W 1 to 5W 1 .
- the lower width W 1 is a width direction distance of the steel sheet from the center of the bottom surface to the start point of the solidification portion formed on the first and second side surfaces.
- the solidification portion formed on the first and second side surfaces may decrease in thickness toward the bottom surface, and may be formed thicker toward the surface portion of the steel sheet.
- the electrical steel sheet may be a oriented electrical steel sheet for which high temperature annealing and tension coating is completed for secondary recrystallization or a oriented electrical steel sheet after high temperature annealing for secondary recrystallization is completed and tension coating is performed.
- Method for manufacturing an electrical steel sheet by melting the surface of the steel sheet by laser irradiation to form a groove (groove) having a first, second side and bottom surface, and forming the groove In the step, by removing the molten by-products of the steel sheet formed on the first, second side, the bottom surface by air blowing or suction, to form an opening portion at least one surface of the first, second side and the bottom surface is exposed. Steps.
- the shape of the laser irradiated onto the surface of the steel sheet may be sphere or oval.
- the groove diameter B W in the rolling direction may be 10 ⁇ m to 70 ⁇ m.
- the width of the rolling direction of the laser irradiated to the surface of the electrical steel sheet may be within 60 ⁇ m.
- the width direction groove length B L of the steel sheet may be 10 ⁇ m to 100 ⁇ m.
- the width of the steel sheet in the width direction of the laser beam irradiated to the surface of the steel sheet is within 90 ⁇ m when the shape of the laser is spherical, and when the shape of the laser is oval. It may be within 150 ⁇ m.
- the groove diameter B W in the rolling direction is 10 ⁇ m to 70 ⁇ m, and the width direction groove length B L of the steel sheet may be 10 ⁇ m to 100 ⁇ m.
- the rolling direction irradiation distance (D S ) may be 3mm to 30mm.
- the solidification portion formed on the first side surface or the second side surface has a side distance C from the bottom surface of the groove from the boundary of the surface of the steel sheet and the solidification portion.
- the distance to the center of can occupy more than 2% of the side distance.
- the groove shape factor is defined as the groove depth D G / lower half width W 1
- the groove forming factor is 0.1 to 9.0.
- the depth D G of the groove is a distance from the surface of the steel sheet to the bottom surface
- the lower half width W 1 is 1/2 of the length of the steel sheet width direction of the bottom surface.
- Irradiation of the laser can be irradiated divided into three to six with respect to the width direction of the steel sheet.
- an apparatus for refining magnetic domains of an electrical steel sheet comprising: a laser generating unit for generating a laser for melting a surface by irradiating the steel sheet, a shaping mirror for controlling the shape of an incident beam incident on the steel sheet, and a moving speed of the steel sheet
- a mobile focal length control unit for controlling the focal length of the incident beam incident on the steel sheet while moving according to
- a molten by-product removal unit for removing the molten by-products generated when the steel sheet surface is melted by laser irradiation.
- the shaping mirror is composed of a plurality of mirrors, and the two mirrors can be linked to form a beam having a circular or elliptical shape.
- the movable focal length control unit includes a polygon scanner mirror and a focus mirror, and may be driven by adjusting a rotation speed of the polygon scanner mirror.
- the continuous wave laser beam is irradiated to the surface of the electrical steel sheet to form grooves, and the molten portion formed by laser irradiation is formed on the inner wall of the grooves, so that the magnetic domains are fined by the tension effect of the solidification structure of the molten portion before the stress relief annealing heat treatment.
- the stress relief annealing heat treatment can ensure the effect, the magnetization of the magnetic domain can be further maximized by securing the static magnetism effect by the tension and groove.
- 1 is a view schematically showing the irradiation of the laser in the vertical direction of the rolling direction on the surface of the grain-oriented electrical steel sheet according to an embodiment of the present invention.
- FIG. 2 is a diagram showing the shape of the groove on the irradiation site when the laser is irradiated to the surface of the steel sheet on the XY plane.
- FIG. 3 is a cross-sectional view taken along the line A-A 'of the steel sheet shown in FIG.
- FIG. 4 is an enlarged view illustrating a solidification part formed on an inner side surface of the groove illustrated in FIG. 3.
- FIG. 5 is a view showing the shape and mode of the laser beam irradiated to the surface of the steel sheet when the magnetic domain of the grain-oriented electrical steel sheet according to the present invention.
- FIG. 6 is a view showing that the laser is irradiated on the surface of the grain-oriented electrical steel sheet according to the present invention in three divided lines with respect to the width direction of the steel sheet.
- FIG. 7 is a view schematically showing the configuration of a magnetic domain micronizing device for irradiating a laser on the surface of the electrical steel sheet according to the present invention.
- 1 is a view showing the irradiation line 20 of the laser irradiated at regular intervals perpendicular to the rolling direction of the electrical steel sheet 10.
- FIG. 3 is a cross-sectional view of grooves 30 having various shapes formed on the surface of the steel sheet by the laser irradiation shown in FIG. 1.
- the electrical steel sheet according to the preferred embodiment of the present invention includes grooves 30 and grooves formed to have first and second side surfaces and bottom surfaces facing each other on a steel sheet.
- the solidification part formed by solidification of the molten by-product of the steel sheet is removed in the process of forming the grooves 30 on the side and bottom surfaces, so that at least one surface of the first and second side surfaces and the bottom surface is exposed. .
- FIG. 4 is a view showing that the solidification part 35 formed by molten by-products is formed on the first and second side surfaces of the grooves formed in the steel sheet.
- the bottom surface of the groove shows that no solidified portion is formed.
- the solidification part 35 formed on the first side or the second side occupies 2% or more of each side distance C.
- the groove shape factor (D G / W 1 ) is characterized in that 0.1 to 9.0.
- a continuous wave laser is irradiated on the surface of the steel sheet to form the groove 30 by melting the surface portion of the steel sheet, and The solidification part of a molten by-product is formed in the 1st, 2nd side surface.
- the electrical steel sheet may be a oriented electrical steel sheet, the directional electrical steel sheet exhibits a GOSS texture in which the texture of the steel sheet is ⁇ 110 ⁇ ⁇ 001> with respect to the rolling direction, so that the magnetic properties in one direction or the rolling direction This is an excellent soft magnetic material.
- a grain-oriented electrical steel has excellent magnetic properties in the rolling direction and is used as a core material for transformers, electric motors, generators, and other electronic devices.
- the manufacture of oriented electrical steel sheet is to be performed by hot rolling ⁇ pre-annealing ⁇ cold rolling ⁇ decarbonization ⁇ high temperature annealing ⁇ leveling annealing and insulation coating ⁇ correction and laser treatment of slab manufactured by continuous casting process. do.
- the directional electrical steel sheet in which the laser irradiation is performed may be a steel sheet before the high temperature annealing process is completed and the tension coating is applied or the high temperature annealing process is completed and the tension coating is applied so that secondary recrystallization of the steel sheet occurs.
- the method may further include forming an opening in which at least one of the first and second side surfaces and the bottom surface is exposed by air blowing or suctioning the molten by-products of the steel sheet formed on the first and second side surfaces and the bottom surface. It includes.
- FIG. 2 shows two irradiation line portions 30 of the steel sheet to which the laser shown in FIG. 1 is irradiated with respect to the XY plane, and schematically shows that grooves are formed by removing molten byproducts while the surface is melted while the laser is irradiated. It is.
- the first and second side surfaces formed on both sides of the inside of the groove are not shown.
- the groove diameter B W of a rolling direction, the width direction groove length B L of a steel plate, and the rolling direction irradiation distance D S of a laser beam are shown in FIG.
- the groove diameter B W in the rolling direction is 10 ⁇ m to 70 ⁇ m.
- the groove diameter in the rolling direction is the heat affected zone (HAZ) adjacent to the molten part at the irradiation site when the width of the rolling direction of the laser irradiated to the surface of the electrical steel sheet is within 60 ⁇ m, as described below. The adjustment is made in consideration of the influence.
- the width of the rolling direction of the laser beam irradiated to the surface of the electrical steel sheet is adjusted to within 60 ⁇ m.
- the width direction groove length (B L ) of the steel sheet is characterized in that 10 ⁇ m to 150 ⁇ m.
- the width groove length of the steel sheet is adjusted in consideration of the influence of the heat affected zone (HAZ) adjacent to the molten portion when irradiating a spherical or elliptical laser having a constant steel sheet width direction length as described below. Done.
- HZ heat affected zone
- the width direction groove length of the steel sheet is less than 10 ⁇ m, there is no improvement in the iron loss before the stress relief annealing (SRA) heat treatment, if the thickness exceeds 150 ⁇ m, the magnetic flux density and the iron loss deterioration before the stress relief annealing heat treatment.
- SRA stress relief annealing
- the steel sheet width direction length of the laser irradiated to the surface of the steel sheet is within 90 ⁇ m when the shape of the laser is spherical, and the shape of the laser is oval. It is characterized in that less than 150 ⁇ m.
- the rolling direction irradiation distance (D S ) is characterized in that 3mm to 30mm in order to minimize the effect of the heat affected by the continuous wave laser beam.
- FIG. 3 is a cross-sectional view in the AA ′ direction of the steel sheet illustrated in FIG. 1, and shows a solidification part 35 formed on the bottom surface of the groove 30 and the first and second side surfaces of the groove 30. .
- FIG. 3 The left side of FIG. 3 is a figure which shows that the solidification part was formed in the 1st, 2nd side surface and the bottom part by laser irradiation.
- FIG. 3 shows that the grooves are formed according to the preferred embodiment of the present invention from the left side of FIG. 3, and the solidification portion does not remain on the bottom surface, and the solidification portion 35 is formed only on the first and second side surfaces of the groove.
- the solidification part 33, 35 is formed only on one side of the bottom surface and the second side, the solidification part 35 is formed only on one side which is the second side of the groove, only the groove is formed and no solidification part remains. Doing.
- the solidification portion 35 formed on the groove first and second side surfaces occupy 2% or more of the first and second side distances, respectively. It is done.
- FIG. 4 is a view illustrating in detail a portion in which a solidification part is formed only on the first and second side surfaces of the groove of FIG. 3.
- the first and second side distances C mean a distance from the boundary of the surface of the steel plate and the side surface to the center of the bottom surface of the groove 30.
- the portion occupied by the solidifying part 35 is less than 2% of the first or second side distance C, the effect of improving iron loss before heat treatment is not preferable.
- the groove shape factor is defined as the depth (D G ) / lower half width (W 1 ) of the groove
- the groove forming factor is 0.1 to 9.0. It features.
- the groove depth D G constituting the groove forming factor means the depth from the surface of the steel sheet to the valley of the solidification portion formed on the bottom surface of the groove.
- the solidification part when the solidification part is removed from the bottom surface of the groove, it means the distance from the surface of the steel sheet to the bottom surface of the groove.
- Lower half width W 1 means 1/2 of the length of the steel plate width direction of the bottom surface, as shown in FIG.
- the steel plate width direction length of the bottom surface may be a straight line distance between boundary points formed by the bottom surface and the first and second side surfaces.
- the laser irradiation is characterized in that the high temperature annealing and tension coating for secondary recrystallization of the steel sheet or the electrical steel sheet before the high temperature annealing for secondary recrystallization is completed and the tension coating is characterized in that the made.
- the molten by-product formed on the surface portion by laser irradiation on the electrical steel sheet is characterized in that it is removed by air blowing (suction) or suction (suction).
- the solidification portion formed in the groove by the air blowing or suction is generated simultaneously or alone on the groove bottom and the first and second side surfaces.
- the molten metal formed on the groove by laser irradiation is injected into the air and scattered to the outside or blown to move to the first and second sides of the groove. It is possible.
- the molten by-product formed on the bottom surface of the groove may be removed using a suction device or the like to prevent the solidification portion from being formed on the bottom surface of the groove.
- FIG. 5 illustrates the shape of the continuous wave laser irradiated to the surface to form a groove on the surface of the electrical steel sheet according to the present invention, and shows the case where the shape of the laser is a sphere or an oval type. .
- the shape of the laser beam formed by the continuous wave laser has a single mode shape of spherical or oval shape as shown in FIG. 5.
- FIG. 5 shows the shape of a spherical or elliptical laser and the Gaussian mode of each laser, all of which are single mode.
- FIG. 6 is a diagram showing that the laser irradiation line 20 irradiated to the surface of the steel sheet is divided (divided) into three, the laser irradiation is divided into three to six with respect to the width direction of the steel sheet is characterized in that the irradiation It is done.
- FIG. 7 illustrates a magnetic domain refinement apparatus for miniaturizing the magnetic domain of the electrical steel sheet by irradiating a continuous wave laser beam to the electrical steel sheet of the present invention.
- the device for refining a magnetic domain of a grain-oriented electrical steel sheet includes a laser generating unit 100 for generating a laser for melting a surface by irradiating a steel sheet and controlling a shape of an incident beam incident on the steel sheet.
- Shaping mirror 120, 125, 127
- a moving focal length control unit for controlling the focal length of the incident beam incident on the steel sheet while moving in accordance with the moving speed of the steel sheet, and the molten by-products generated when the surface of the steel sheet is melted by laser irradiation It characterized in that it comprises a molten by-product removal unit 170 to remove.
- the shaping mirrors 120, 125, and 127 are composed of a plurality of mirrors, and the two mirrors are linked to each other to form a beam having a circular or elliptical shape.
- the movable focal length control unit is composed of a polygon scanner mirror 130 and a focus mirror 160, and is driven by adjusting a rotation speed of the polygon scanner mirror 130.
- the laser generation unit 100 generates a continuous wave laser, and the generated lasers are converted into a circular or oval shape by interlocking two lenses via the total reflection mirror 110 ( After the conversion by the 120, 125, 127, the focal length of the incident beam incident on the steel sheet while moving the laser incident from the shaping mirror (120, 125, 127) according to the moving speed of the steel sheet while rotating at a constant speed It enters into a steel plate by the moving focal length control part to adjust.
- the movable focal length control unit includes a polygon scanner mirror 130 and a focus mirror 160.
- grooves are formed on the surface of the steel sheet by removing the molten by-products by an air blower or a suction device.
- the molten byproduct may be removed by scattering the molten byproduct by an air blower.
- the grooves formed by the continuous wave laser may be formed on the bottom surface, the first and the first, and On the two sides will have a solidified portion 33, 35, the molten by-product solidified, the irradiation distance (D S ) of the groove is adjusted by adjusting the rotational speed of the polygon scanner mirror 130 in the laser optical system.
- the continuous wave laser beam oscillated by the laser generating unit 100 passes through the total reflection mirror 110 and then beam shape irradiated onto the steel sheet 10 through the plurality of shaping mirrors 120, 125, and 127.
- the spherical and elliptical beams are formed by selectively using the beam shaped mirrors 125 and 127 through the cylinder 140.
- two shaping mirrors 120 and 125 may be interlocked to form a laser shape, and two shaping mirrors 120 and 127 may be interlocked to shape the laser. It can be formed by (oval).
- a circular or elliptical beam may be formed by combining with the shaping mirror 120 of the front end portion.
- the shaping mirrors 120, 125, and 127 are formed to have different curvatures.
- the laser converted to have a predetermined shape in the shaping mirrors 125 and 127 passes through the polygon scanner mirror 130 to irradiate the continuous wave laser to the steel sheet from the focus mirror 160.
- the laser irradiation line 20 irradiated onto the steel sheet 10 may be adjusted to 3 to 30 mm by adjusting the rotation speed of the polygon scanner mirror 130.
- the polygon scanner mirror 130 is rotated by attaching a flat mirror to a circular rotating surface, each mirror irradiates a laser beam to the surface of the steel sheet for a short time, and then another adjacent mirror receives the laser beam Will be produced continuously.
- the molten byproduct formed on the surface of the steel sheet may be scattered to form a groove from which the molten byproduct has been removed, or a solidified part in which the molten byproduct is solidified on the first and second side surfaces of the groove.
- the molten byproduct removing means which blows in air or the like may be used to scatter the molten byproduct.
- suction means for removing the molten by-product can be used.
- Table 1 shows the change in the iron loss improvement rate of the grain-oriented electrical steel sheet due to the solidified structure of the groove and the molten by-product formed on the surface of the steel sheet of 0.27mm thickness by continuous wave laser irradiation of the present invention.
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Description
| 구 분 | BW | BL | DS | DG/W1 | DS | 레이저 조사전 | 레이저 조사후 | SRA후 | 철손개선율 | |
| ㎛ | 무차 | mm | W17/50 | 조사후 | SRA후 | |||||
| 발명예 1(연속파 레이저/타원형) | 40 | 55 | 15 | 2.3 | 4.5 | 0.95 | 0.86 | 0.84 | 9.5 | 11.6 |
| 0.93 | 0.84 | 0.81 | 9.7 | 12.9 | ||||||
| 0.96 | 0.85 | 0.83 | 11.5 | 13.5 | ||||||
| 발명예 2(연속파 레이저/원형) | 40 | 45 | 15 | 2.3 | 4 | 0.95 | 0.87 | 0.84 | 8.4 | 11.6 |
| 0.93 | 0.85 | 0.82 | 8.6 | 11.8 | ||||||
| 0.94 | 0.86 | 0.83 | 8.5 | 11.7 | ||||||
| 비교예(펄스 레이저/불연속그루브) | 50 | 90 | 15 | 2.3 | 6 | 0.95 | 0.96 | 0.89 | -1.1 | 6.3 |
| 0.94 | 0.97 | 0.88 | -3.2 | 6.4 | ||||||
Claims (22)
- 강판상에 상호 마주하는 제 1 측면과 제 2 측면 및 바닥면을 가지도록 형성된 그루브(groove); 와상기 제 1, 제 2 측면 및 바닥면상에 그루브 형성과정에서 상기 강판의 용융부산물이 응고하여 형성되는 응고부가 제거되어 상기 제1, 제 2 측면 및 바닥면 중 적어도 일면이 노출되는 오프닝부; 를 가지는 것을 특징으로 하는 전기강판.
- 제 1 항에 있어서,상기 제 1 측면 또는 제 2 측면에 형성된 응고부는,측면거리(C)를 강판의 표면과 상기 측면의 경계로부터 상기 그루브의 바닥면의 중심(center)까지의 거리라고 정의할 때,상기 측면거리의 2% 이상을 점유하는 것을 특징으로 하는 전기강판.
- 제 1 항에 있어서,상기 그루브의 형성시, 그루브 형상인자를 그루브의 깊이(DG)/하부반가폭(W1)으로 정의할 때, 상기 그루브 형성인자는 0.1 내지 9.0인 것을 특징으로 하는 전기강판.여기서, 상기 그루브의 깊이(DG)는 상기 강판의 표면으로부터 상기 바닥면까지의 거리이며, 하부 반가폭(W1)은 상기 바닥면의 강판폭방향 길이의 1/2이다.
- 제 1 항에 있어서,상기 그루브의 폭 범위는 10~70㎛ 인 것을 특징으로 하는 전기강판.
- 제 1 항에 있어서,상기 그루브의 깊이는 0.5㎛ 이하인 것을 특징으로 하는 전기강판.
- 제 1 항에 있어서,상기 응고부의 두께 범위는 0.05W1~5W1인 것을 특징으로 하는 전기강판.여기서, W1은 하부 반가폭을 의미하며, 하부 반가폭(W1)은 상기 바닥면의 강판폭방향 길이의 1/2이다.
- 제 1 항에 있어서,상기 제 1, 제 2 측면에 형성되는 응고부는 상기 바닥면으로 갈수록 두께가 감소하며, 상기 강판의 표면부로 갈수록 두껍게 형성되는 것을 특징으로 하는 전기강판.
- 제 1 항에 있어서,상기 전기강판은 2차 재결정을 위한 고온 소둔 및 장력코팅이 완료된 방향성 전기강판 또는 2차 재결정을 위한 고온 소둔이 완료되고 장력코팅이 이루어지기 전의 방향성 전기강판인 것을 특징으로 하는 전기강판.
- 레이저 조사에 의해 강판 표면을 용융하여 제 1, 제 2 측면 및 바닥면을 가지는 그루브(groove)를 형성하는 단계; 및상기 그루브를 형성하는 단계에서, 상기 제 1, 제 2 측면, 바닥면상에 형성되는 상기 강판의 용융부산물을 에어 블로잉 또는 석션하여 제거함으로써, 상기 제 1, 제 2 측면 및 바닥면 중 적어도 일면이 노출되는 오프닝부를 형성하는 단계; 를 포함하는 전기강판의 제조방법.
- 제 9 항에 있어서,상기 강판의 표면에 조사되는 레이저의 형상은 구형(sphere) 또는 타원형(oval)인 것을 특징으로 하는 전기강판의 제조방법.
- 제 9 항에 있어서,상기 레이저의 조사에 의해 상기 전기강판의 표면에 그루브 형성시,압연방향의 그루브 직경(BW)은 10㎛ 내지 70㎛ 인 것을 특징으로 하는 전기강판의 제조방법.
- 제 11 항에 있어서,상기 압연방향의 그루브 직경을 형성하기 위하여, 상기 전기강판의 표면에 조사되는 레이저의 압연방향 폭은 60㎛ 이내 인 것을 특징으로 하는 전기강판의 제조방법.
- 제 9 항에 있어서,상기 레이저의 조사에 의해 상기 전기강판의 표면에 그루브 형성시,강판의 폭방향 그루브 길이(BL)는 10㎛ 내지 100㎛ 인 것을 특징으로 하는 전기강판의 제조방법.
- 제 13 항에 있어서,상기 강판의 폭 방향 그루브 길이 형성을 위하여,상기 강판 표면에 조사되는 레이저의 강판 폭 방향 길이는,상기 레이저의 형상이 구형인 경우, 90㎛ 이내이며,상기 레이저의 형상이 타원형(oval)인 경우, 150㎛ 이내인 것을 특징으로 하는 전기강판의 제조방법.
- 제 9 항에 있어서,상기 레이저의 조사에 의해 상기 전기강판의 표면에 그루브 형성시,압연방향의 그루브 직경(BW)은 10㎛ 내지 70㎛ 이며, 강판의 폭방향 그루브 길이(BL)는 10㎛ 내지 100㎛ 인 것을 특징으로 하는 전기강판의 제조방법.
- 제 9 항에 있어서,상기 레이저의 조사시,압연 방향 조사거리(DS)는 3mm 내지 30mm 인 것을 특징으로 하는 전기강판의 제조방법.
- 제 9 항에 있어서,상기 레이저의 조사에 의해 상기 전기강판의 표면에 형성되는 그루브에 있어서,상기 제 1 측면 또는 제 2 측면에 형성된 응고부는,측면거리(C)를 강판의 표면과 상기 측면의 경계로부터 상기 그루브의 바닥면의 중심(center)까지의 거리라고 정의할 때,상기 측면거리의 2% 이상을 점유하는 것을 특징으로 하는 전기강판의 제조방법.
- 제 9 항에 있어서,상기 그루브의 형성시, 그루브 형상인자를 그루브의 깊이(DG)/하부반가폭(W1)으로 정의할 때, 상기 그루브 형성인자는 0.1 내지 9.0인 것을 특징으로 하는 전기강판의 제조방법.여기서, 상기 그루브의 깊이(DG)는 상기 강판의 표면으로부터 상기 바닥면까지의 거리이며, 하부 반가폭(W1)은 상기 바닥면의 강판폭방향 길이의 1/2이다.
- 제 9 항에 있어서,상기 레이저의 조사는 상기 강판의 폭 방향에 대하여 3~6개로 구분되어 조사되는 것을 특징으로 하는 전기강판의 제조방법.
- 강판에 조사하여 표면을 용융하기 위한 레이저를 발생시키는 레이저 발생부;강판에 입사되는 입사빔의 형상을 제어하는 쉐이핑 미러;강판의 이동속도에 따라 이동하면서 강판에 입사되는 입사빔의 초점거리를 조절하는 이동식 초점거리 제어부; 및레이저 조사에 의해 강판 표면이 용융시 발생되는 용융부산물을 제거하는 용융부산물 제거부; 를 포함하는 것을 특징으로 하는 전기강판의 자구 미세화 장치.
- 제 20 항에 있어서,상기 쉐이핑 미러는 복수의 미러로 구성되며, 2개의 미러를 연동시켜 원형 또는 타원형의 형상을 갖는 빔을 형성하는 것을 특징으로 하는 전기강판의 자구 미세화 장치.
- 제 20 항에 있어서,상기 이동식 초점거리 제어부는 폴리곤 스캐너 미러와 초점 미러로 구성되며, 상기 폴리곤 스캐너 미러의 회전속도를 조절하여 구동되는 것을 특징으로 하는 전기강판의 자구 미세화 장치.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2014549958A JP6307441B2 (ja) | 2011-12-29 | 2012-11-15 | 電気鋼板およびその製造方法 |
| EP12861844.4A EP2799560A4 (en) | 2011-12-29 | 2012-11-15 | ELECTRIC MATTRESS AND METHOD FOR MANUFACTURING THE SAME |
| CN201280065201.9A CN104039988B (zh) | 2011-12-29 | 2012-11-15 | 电工钢及其制造方法 |
| US14/369,571 US20140374137A1 (en) | 2011-12-29 | 2012-11-15 | Electrical Steel Sheet and Method for Manufacturing the Same |
| US16/152,796 US10804015B2 (en) | 2011-12-29 | 2018-10-05 | Electrical steel sheet and method for manufacturing the same |
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| KR10-2011-0145401 | 2011-12-29 | ||
| KR1020110145401A KR101370634B1 (ko) | 2011-12-29 | 2011-12-29 | 전기강판 및 그 제조방법 |
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| US14/369,571 A-371-Of-International US20140374137A1 (en) | 2011-12-29 | 2012-11-15 | Electrical Steel Sheet and Method for Manufacturing the Same |
| US16/152,796 Continuation-In-Part US10804015B2 (en) | 2011-12-29 | 2018-10-05 | Electrical steel sheet and method for manufacturing the same |
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| US (1) | US20140374137A1 (ko) |
| EP (1) | EP2799560A4 (ko) |
| JP (1) | JP6307441B2 (ko) |
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2011
- 2011-12-29 KR KR1020110145401A patent/KR101370634B1/ko active Active
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2012
- 2012-11-15 EP EP12861844.4A patent/EP2799560A4/en not_active Ceased
- 2012-11-15 US US14/369,571 patent/US20140374137A1/en not_active Abandoned
- 2012-11-15 JP JP2014549958A patent/JP6307441B2/ja active Active
- 2012-11-15 WO PCT/KR2012/009642 patent/WO2013100353A1/ko not_active Ceased
- 2012-11-15 CN CN201280065201.9A patent/CN104039988B/zh active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20080010454A (ko) * | 2005-05-09 | 2008-01-30 | 신닛뽄세이테쯔 카부시키카이샤 | 저철손 방향성 전기강판 및 그 제조 방법 |
| KR20100034896A (ko) * | 2008-09-25 | 2010-04-02 | 주식회사 포스코 | 전기강판의 자구 미세화 장치, 자구미세화 방법 및자구미세화 처리된 전기강판 |
| KR20110124292A (ko) * | 2009-03-11 | 2011-11-16 | 신닛뽄세이테쯔 카부시키카이샤 | 방향성 전자기 강판 및 그 제조 방법 |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2016532776A (ja) * | 2013-07-24 | 2016-10-20 | ポスコPosco | 方向性電磁鋼板およびその製造方法 |
| EP3025797A4 (en) * | 2013-07-24 | 2017-02-08 | Posco | Grain-oriented electrical steel sheet and method for manufacturing same |
| US10793929B2 (en) | 2013-07-24 | 2020-10-06 | Posco | Grain-oriented electrical steel sheet and method for manufacturing same |
| JP2018507111A (ja) * | 2014-12-24 | 2018-03-15 | ポスコPosco | 鋼板表面の溝形成方法およびその装置 |
Also Published As
| Publication number | Publication date |
|---|---|
| EP2799560A1 (en) | 2014-11-05 |
| CN104039988A (zh) | 2014-09-10 |
| JP2015510543A (ja) | 2015-04-09 |
| EP2799560A4 (en) | 2016-03-16 |
| JP6307441B2 (ja) | 2018-04-04 |
| CN104039988B (zh) | 2016-05-11 |
| US20140374137A1 (en) | 2014-12-25 |
| KR101370634B1 (ko) | 2014-03-07 |
| KR20130076953A (ko) | 2013-07-09 |
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