Magnetic domain refining method of the grain-oriented electrical steel sheet for processing permanent refinement of the magnetic domains of the steel sheet by irradiating a laser on the grain-oriented electrical steel sheet and relates to an apparatus.
BACKGROUND
[2]
For example, in order to reduce the power loss of the electric device, such as a transformer to improve the efficiency, the grain-oriented electrical steel sheet having magnetic properties with low iron loss with high magnetic flux density is required.
[3]
By in order to reduce the iron loss of grain-oriented electrical steel sheet was irradiated with a mechanical method or laser beam on the steel sheet surface refining the magnetic domain in a direction perpendicular to the rolling direction, there is disclosed a technique of reducing the iron loss.
[4]
Magnetic domain refinement method can be identified by magnetic domain refinement temporary and permanent domain refinement in accordance with whether the after stress relief annealing, maintaining the improved magnetic domain refinement effect.
[5]
Temporary magnetic domain refinement method has the disadvantage of losing the effect of magnetic domain refinement after stress relief annealing. Temporary magnetic domain refinement method, thereby refining the magnetic domains by forming localized compressive stresses on the surface of the steel sheet part. This method, however, is required due to the re-coating an insulating coating layer to cause damage to the surface of the steel sheet, a high manufacturing cost disadvantage because the magnetic domain refining treatment in an intermediate step is not the final product.
[6]
Permanent magnetic domain refinement method can maintain the iron loss improvement effect even after heat treatment. For permanent domain refinement process, a generally used technique using an etching method or the roll method, a laser method. If the etching process is difficult to form groove depth and width control, because it uses an acid solution is difficult to guarantee the iron loss properties of the final product is a disadvantage not not environmentally friendly. For the method using a roll, stability, reliability, and process for machining complex has drawbacks.
[7]
Method for permanent domain refinement of the steel sheet by using a laser, it is possible to irradiate the laser beam at the surface of the steel sheet in a state of supporting the steel sheet to adjust the tension of refining the magnetic domain to form a melt groove on the surface of the steel sheet. In this way, in as refining the magnetic domains by a laser, and high-speed processing is possible, the improvement and optimization of the more efficient process is desired to lower the iron loss of an electrical steel sheet to improve the magnetic flux density.
Detailed Description of the Invention
SUMMARY
[8]
By optimizing the equipment and process, and provides a magnetic domain refining method of the grain-oriented electrical steel sheet so as to increase the throughput by increasing the magnetic domain refinement efficiency improves workability through it and the device.
[9]
Increase than the core loss improved efficiency provides a magnetic domain refining method of the grain-oriented electrical steel sheet so as to minimize the magnetic flux density decreases and the device.
[10]
It provides a magnetic domain refining method of the hill-up and sputtering, etc. The grain-oriented electrical steel sheet to improve the quality of products to remove contaminants more efficiently formed in accordance with the laser irradiation and the device.
[11]
It provides a magnetic domain refining method of the grain-oriented electrical steel sheet and the apparatus to provide the optimum operating conditions required for the process.
Problem solving means
[12]
This embodiment the magnetic domain refinement method, while supporting the steel sheet was irradiated with steel support roll position adjusting step, the laser beam for controlling the vertical position of the steel melt the steel sheet laser irradiation to form a groove on the surface of the steel strip , and a laser irradiation can include setting a holding step of setting and maintaining the internal operating environment of the room in which the laser process.
[13]
The magnetic domain refinement method, the steel sheet may further comprise a skew control step of causing the mobile without the bias to the left or right along the production line center.
[14]
The magnetic domain refining method may be holding the steel sheet to a flat expanded state further comprises a tension control step of giving a tension to the steel sheet.
[15]
The sustain step is set, by the laser room interior isolated from the outside may include a step of controlling comprising the steps of: blocking the introduction of external contaminants, laser room inside temperature and pressure and humidity.
[16]
The magnetic domain refining method may further include process steps for removing the after hileop (up hill) and sputtering (spatter) formed on a surface of the steel sheet after the laser exposure step.
[17]
The post-processing step may include a step of removing the brush heel up and spatters deposited on the brush roll to the steel sheet surface.
[18]
The post-processing step, and a cleaning step of adding to remove the heel up and spatter remaining the steel by reacting the alkali solution and the electrolysis on the surface of the steel sheet, is removed from the steel sheet in the cleaning step to filter out the foreign substances contained in the alkali solution from the alkali solution It may further include a filtering stage for betting.
[19]
The meandering control step, meandering amount measuring step the width center position of the steel sheet to measure the skew amount of off-center production line, and an axis of the steering roll (Steering Roll) according to the skew amount of the meandering of the steel sheet measured in the quantity measuring step by rotating and moving may include a skew amount control step of controlling the meandering amount of the steel sheet by adjusting the moving direction of the steel sheet.
[20]
The skew amount control step may be controlled to within ± 1mm ​​the meandering amount of the steel sheet.
[21]
The tension control step, the tension bridal rolls (Tension Bridle Roll) in the applied steel sheet tension to apply a tension to the steel sheet step, the steel sheet tension measuring step for measuring the tension of the steel sheet was subjected to phase applied tension the steel sheet by, and depending on the tension of the steel plate measured at the measuring step the tension of the steel sheet may include a steel sheet tension control step of controlling the steel sheet tension by adjusting the speed of the rolls of the tension bridle.
[22]
The steel support roll position adjusting step includes: a luminance measurement step of measuring the brightness of the flame generated during the laser irradiation on the steel sheet of the steel supporting step, the laser irradiation method comprising: plate supporting roll supporting the steel plate which is located in the laser irradiation step, and adjust the position of the flame steel support roll by steel support roll position control system according to the brightness measured by the brightness measuring step to a steel support roll position control step of controlling so that the steel sheet is placed in the focal point of the laser depth (depth of focus) It can be included.
[23]
The laser irradiation step, within each of the optical system by the transmitted laser beam is irradiated on the surface of the steel sheet top width, bottom width and the depth of investigation in the laser oscillator 70㎛, 10㎛ within, Sikkim form a 3 to 30㎛ groove and at the same time to a laser irradiation, and the energy transfer step for delivering the laser beam energy density in the laser beam such that retake high-value generation to remain in the melted portion groove inner wall upon irradiation, from 1.0 to 5.0 J / ㎟ range required for the melting of the steel sheet in the steel sheet can.
[24]
The laser irradiation step, a laser to control the laser oscillator to the off (Off) state when a laser oscillator oscillating a laser beam, under normal operating conditions by the laser oscillator controller in the on (On) state, and the amount of meandering of the steel sheet occurs more than 15mm It may comprise a beam starting control step.
[25]
A laser oscillator in the laser irradiation step may be a continuous wave oscillation laser beam is a Gaussian energy distribution (Gaussian energydistribution).
[26]
In the laser irradiation optical system includes the step interval of the laser beam radiation by controlling the laser scanning speed in the rolling direction can be adjusted to 2 to 30 mm.
[27]
The laser irradiation step may further include the angle conversion step of converting the radiation angle of the laser beam is irradiated on the surface of the steel sheet.
[28]
The angle conversion step can convert the radiation angle of the laser beam with respect to the width direction of the steel sheet in the range of ± 4 °.
[29]
The laser irradiation step, the steel sheet support rolls against the surface of the steel sheet is conducted in contact with a circular arc shape on the surface, and the laser beam irradiation position at which the irradiation direction of the laser beam over the center axis of the steel support roll as a reference point the steel sheet from the reference point the outer surface in the support roll center at a position spaced by an angle, it is possible to irradiate the laser beam.
[30]
In the laser irradiation step, the laser beam along the outer peripheral surface of the steel support roll center relative to the reference point can be irradiated in the range from 3 to 7 ° apart.
[31]
The laser irradiation step may further include the step of blocking blocks the scattered light and the heat of the laser beam entering the optical system of the laser irradiation equipment.
[32]
The laser irradiation step may further include a dust collection step of removing by suction the fume (fume) and molten iron generated during the laser beam irradiation.
[33]
The dust collection step can be sprayed with compressed dry air to the inside groove of the steel plate include a spraying step for the removal of molten steel remaining in the internal grooves.
[34]
Magnetic domain refinement device example of this implementation, while supporting the steel sheet by irradiating a steel support roll position control equipment, the laser beam for controlling the vertical position of the steel plate to melt a steel plate the laser irradiation equipment to form a groove on the surface of the steel sheet, and receiving the isolated steel support roll position adjusting equipment and the laser irradiation equipment from outside, and may include a laser that provides the operating room environment for the laser irradiation.
[35]
The magnetic domain refining apparatus may further comprise a skew of the control to be taken without the steel sheet is biased to the left or right along the production line center.
[36]
The magnetic domain refining apparatus may further include a tension control equipment to keep the tension to be given to the steel sheet in the expanded state the flat steel plate.
[37]
The laser room is both side forming the inlet and the outlet along the direction of movement of the laser irradiation equipment and the steel support roll location receiving a control facility to form an internal space so that isolated from the outside, and the steel sheet, inside the internal laser room can be the upper space optical system in a positive pressure device, a laser irradiation equipment for increasing the pressure than the outside comprises a constant temperature and humidity controller of the steel sheet is controlled to the lower space and the separation of the optical system the lower frame, and a laser room interior temperature and humidity of passing.
[38]
Then to remove the hileop (up hill) and sputtering (spatter) formed on a surface of the steel sheet may further include a treatment plant.
[39]
The post-processing equipment is arranged on the rear end of the laser room may include a brush roll to eliminate the heel up and sputtering the surface of the steel sheet.
[40]
The after-treatment equipment is connected to the steel plate is disposed at the rear end a brush roll by reacting the alkali solution and the electrolysis in the heel up and spatter removal the clean unit and clean unit to add the remaining on the surface of the steel sheet contained in the alkali solution of the cleaning unit the foreign matter may further include a filter to filter out from the alkaline solution.
[41]
The skew of the control is skew measuring sensor to measure the steering roll (Steering Roll), degree (skew amount) the width center position of the steel sheet out from the central production line for switching the moving direction of the steel sheet, and the skew measuring in accordance with the output value of the sensor may comprise a steel central position control system (center Strip position Control System) for controlling the orientation by rotating and moving the steel sheet moving shaft of the steering roll.
[42]
The tension control equipment is a tension bridle roll (Tension Bridle Roll), the tension bridle plate tension-measuring sensor for measuring the tension of the steel strip passes through the rolls, and the steel sheet leading to move while applying a tension to the steel sheet depending on the tension of the steel plate measured at a tension measuring sensor can include a steel (Strip) tension control system for adjusting the speed of the rolls of the tension bridle.
[43]
The steel support roll position adjustment facility, steel support roll, the brightness sensor for measuring the brightness of the flame generated during the laser irradiation on the steel sheet by the laser irradiation equipment for supporting the plate in the laser irradiation equipment location, and wherein the luminance measurement according to the brightness of the flame measured by the sensor may comprise a steel support roll position control system for controlling the position of said plate support roll.
[44]
The laser irradiation equipment, irradiated with a laser oscillator, the laser beam oscillated from the laser oscillator to oscillate a continuous wave laser beam on the steel sheet surface within each of the top width, bottom width and depth 70㎛, 10㎛ within 3 to Sikkim 30㎛ forming a groove in and at the same time comprise a retake optical system for generating high-value so, delivering the laser energy density in the 1.0 to 5.0 J / ㎟ range required for the melting of the steel sheet in the steel sheet to remain in the groove inner wall portion melted during laser irradiation can.
[45]
The laser irradiation equipment, under normal operating conditions and the amount of the steel sheet Sa to the laser oscillator to an on (On) state may further include a controller for controlling the laser oscillator to the laser oscillator off (Off) state when it occurs more than 15mm.
[46]
The laser oscillator can oscillate a continuous wave laser beam is a Gaussian energy distribution (Gaussian energydistribution).
[47]
The optical system may adjust the interval of the laser radiation by controlling the laser scanning speed of 2 to 30 mm along the rolling direction.
[48]
The laser irradiation equipment has an optical system for irradiating a laser beam on the steel sheet consists of a rotatable structure by the driver, and the optical system is rotated with respect to the steel plate may be a structure for converting the radiation angle of the laser beam with respect to the width direction of the steel sheet.
[49]
The laser irradiation equipment to a laser beam irradiation position when passing the central axis of the steel support roll irradiation direction of the laser beam relative to the surface of the steel sheet proceeds in contact with a circular arc shape on the roll surface of the support plate as a reference point, the steel sheet at the reference point with the angle along the outer surface in spaced-apart support roll center location it may be a structure in which the laser beam is irradiated.
[50]
The laser irradiation equipment may be a structure in which a laser beam to the outer peripheral surface of the steel support roll center relative to the reference point in the range from 3 to 7 ° apart along.
[51]
The laser irradiation equipment may further include a shield to block scattered light from entering the laser optical system and heat.
[52]
The laser irradiation equipment may further include a molten iron removal system for removing fumes and spatter generated in accordance with the laser beam is irradiated to the steel sheet.
[53]
The molten iron removal system may include a dust collecting hood for removing by suction the air knife, fumes and molten iron by injecting compressed dry air to the inside groove of the steel sheet to remove the molten steel remaining in the internal grooves.
Effects of the Invention
[54]
According to the present embodiment as described above, the process proceeds to magnetic domain refinement process of the steel sheet in progress while still, the laser stable to at least 2m / sec high speed, before heat treatment of the electrical steel sheet, after the iron loss is 5% or more for improvement, respectively, 10% It can be obtained later.
[55]
In addition, the magnetic domain refining to increase efficiency it is possible to increase the magnetic domain refinement treatment by improving the ability workability.
[56]
In addition, to increase the iron loss than the improved efficiency it is possible to minimize the magnetic flux density decreases.
[57]
In addition, the more effective removal of contaminants, such as hill-up and spatter formed in accordance with the laser irradiation is possible to improve the quality of the product.
[58]
Further, by providing the optimum operating conditions required for the process, it is possible to produce high quality products in large quantities.
Brief Description of the Drawings
[59]
1 is a view schematically showing the configuration of the magnetic domain refinement apparatus of the grain-oriented electrical steel sheet according to the present embodiment.
[60]
Figure 2 is a schematic view showing a magnetic domain refinement treated steel sheet according to the present embodiment.
[61]
Figure 3 is a schematic view showing the optical configuration of the laser irradiation equipment according to this embodiment.
Best Mode for Carrying Out the Invention
[62]
Terminology used in the following are only intended to refer to a specific embodiment and are not intended to limit the present invention. As used herein, the singular forms also include the plural forms a phrase that does not represent a meaning clearly contrary in this way. The meaning of "comprising" as used herein is a specific characteristic, region, integers, steps, operations, elements, and / or and refine the components, other specific characteristics, regions, integers, steps, operations, elements, components and / or the group the presence of or not to exclude the addition.
[63]
With reference to the accompanying drawings, a description will be given of an embodiment of the present to in the art to practice the self-facilitating skilled invention. As in the art it can readily appreciate self having ordinary skill, for example, embodiments described below may be modified in various forms to the extent not departing from the concept and scope of the invention. Thus, the invention is not to be implemented in many different forms and limited to the embodiments set forth herein.
[64]
In this embodiment, the following description explains the facility for permanent domain refinement in grain-oriented electrical steel sheet used in the transformer core material, for example.
[65]
Figure 1 and a schematic diagram showing a directional magnetic domain refinement apparatus of the electrical steel sheet according to this embodiment, Figure 2 shows a steel plate treated magnetic domain refinement in accordance with the present embodiment. In the following description, means the x-axis direction in Fig. 2 in the rolling direction or the steel strip traveling direction and width direction of the steel sheet of the meaning the y-axis direction in FIG. 2 in a direction perpendicular to the rolling direction, and the width of the y-axis direction It refers to the length. In Figure 2 reference numeral 31 indicates the radiation continuously formed in the plate (1) surface payeojyeo to form grooves by a laser beam.
[66]
Referring to Figure 1, the magnetic domain refinement apparatus of the grain-oriented electrical steel sheet according to the present embodiment is reliably performed even if the permanent domain refinement process plate (1) is in progress by more than 2m / s at high speed.
[67]
Example magnetic domain refinement apparatus of this embodiment, supporting the plate (1) by irradiating the plate adjustment support roll position equipment, the laser beam for controlling the vertical position of the steel plate to melt a steel plate the laser irradiation equipment to form a groove on the surface of the steel strip and receiving the steel support roll position adjustment facility and isolated from the outside, and the laser irradiation equipment may include a laser room (20) for providing an operating environment for the laser irradiation.
[68]
In addition, the magnetic domain refinement apparatus may further comprise a skew of the control to be taken without the steel strip 1 is biased to the left or right along the production line center.
[69]
In addition, the magnetic domain refinement apparatus can steel plate (1) further comprising a tension control equipment to impart tension to the steel sheet to be flat and maintained in an expanded state without being a hit.
[70]
In addition, the magnetic domain refinement apparatus may further comprise a treatment system for removing after hileop (up hill) and sputtering (spatter) formed on a surface of the steel sheet in accordance with laser beam irradiation.
[71]
Hileop (up hill) means a portion formed when stacked, over a predetermined height on each side of the groove portion of the iron in the molten steel to form a groove by irradiating a laser beam on the steel sheet surface. Spatter (spatter) is generated during the laser beam irradiation means for the solidified molten iron on the surface of the steel sheet.
[72]
The skew of the control is a wide degree (skew amount) is the center position off-center production line of the steering roll (Steering Roll) (2A, 2B), the plate (1) for switching the moving direction of the steel plate (1) It calculates a detection signal of the skew sensor 4, the skew measuring sensor 4 for measuring by rotating and moving the axis of the steering roll (2A, 2B) steel plate for adjusting the direction in which the steel plate (1) moving the center may include a position control system (Strip Center position Control System) (3).
[73]
Skew measuring sensor 4 is arranged on the rear end of the steering roll (2B) is detected by the actual skew amount of the coarse steering roll steel sheet in real time.
[74]
By being moved straight without the skew of the control left and right along the center of the steel sheet production line by the uneven distribution, it is possible to form a groove on the surface of the steel sheet over the entire width of the steel sheet.
[75]
The skew of the control is measured the amount of meandering of the steel plate by a groove formed in the surface of the steel sheet before the process by the laser irradiation, skew measurement sensor (4). Sa rotation axis of the sensor as measured by 4, the value is output to the steel sheet center position control system, the steel sheet center position control system is a steering roll (2A, 2B) according to the calculated skew degree by calculating the output of the skew sensor and thereby moving. In this way, the steering roll (2A, 2B) are being rotated and moved, the moving direction of the steel plate to be moved wrapped around the steering roll is adjusted. Thus, the control amount of meandering of the steel strip it is possible to control the meandering amount of the steel sheet (1) to within ± 1mm.
[76]
The tension control equipment is a tension bridle roll for guiding the movement while applying a tension of a predetermined size in the steel strip (1) (Tension Bridle Roll: TBR) (5A, 5B), the tension bridal rolls into the steel strip passing through the ( 1) steel tension measuring sensor 7 for measuring the tension in, and adjusting the speed of the tension of the tension bridle roll (5A, 5B) in accordance with the steel strip 1 measured by the plate tension measuring sensor (7) It may include a steel plate (Strip) tension control system 6 for.
[77]
The steel tension measuring sensor (7) measures the actual tension of the tension bridle rolls (5B) is disposed at the rear end of the steel sheet tension is given through the tension bridal rolls (5B) in real time.
[78]
In this embodiment, the tension of the steel plate may be set due to the excessive tension and make flat the surface of the steel sheet in the shape of the laser irradiation position of the laser irradiation equipment so that the breakage of the steel sheet will not occur.
[79]
The tension of the control in order to work with the steel sheet tension in the set range, a tension bridle rolls (Tension Bridle by steel (Strip) tension control system (6) according to the tension of the steel plate measured at the steel tension measuring sensor (7) Roll: adjust the speed of the TBR) (5A, 5B). Thus, the tension control equipment gives a tension to the steel sheet is controlled so that the tension set within the error range of the steel sheet (1).
[80]
It passes through the tension of the control plate is a laser room 20 is introduced into the steel support roll position adjusting equipment and the laser irradiation equipment passing through the magnetic domain refining process is escape to the external laser room 20. For the laser room shall be re-described below.
[81]
In this embodiment, the laser room 20 inside the laser irradiation equipment and the steel support roll (9) disposed just under the steel sheet with a support roll between each deflector rolls on either side (Deflector Roll) (8A, 8B) is It is arranged.
[82]
The moving direction of the steel plate (1) is switched so as to face to the steel supporting roll 9 by a deflector roll (Roll Deflector) (8A, 8B). Plate (1) is a deflector roll (8A) passes while steel support roll 9, the moving direction is switched into the steel support roll after contact with the 9 back direction towards the deflector roll (8B) are converted to the deflector roll (8B) the move is over.
[83]
Plate (1) by the deflector roll is to pass while in surface contact with the support roll in accordance with the steel support roll (9) wound in a circular arc shape plate. In order to minimize the laser beam focal length variations due to vibration and the wave of the laser beam irradiation when the steel sheet, the steel sheet is to go through the full surface contact with the plate support roll, a laser beam on the steel sheet traveling along the roll supporting plate in this state It should be investigated. In this embodiment, as the steel sheet to the steel sheet support roll contact surface as described above it it is possible to accurately irradiate the laser beam on the steel sheet.
[84]
The steel support roll position adjustment facility, the brightness of the flame to the steel supporting roll 9, the steel plate 1 from the laser irradiation equipment for supporting the plate (1) with the laser irradiation position of the laser irradiation equipment generated during laser irradiation steel support roll (SPR) for controlling the position of the steel strip supporting roll 9 according to the brightness of the flame measured the luminance sensor 10, and the brightness measurement sensor 10 to measure a position control system (12 ) may include.
[85]
The steel support roll position adjustment facility, steel support roll (9) supporting the plate (1) with a laser light irradiating position by, and that the steel sheet is located within the depth of the high laser plate irradiation efficiency focus (Depth of Focus) plate presented the best state laser, the brightness of the flame generated during irradiation steel support roll (9) to adjust the position as a whole up and down. In addition, the brightness of the flame generated during the laser irradiation on the steel sheet is measured using the brightness sensor (10).
[86]
The steel support roll position control equipment in this embodiment may further include a distance measuring sensor 11 for measuring the actual distance between the surface of the steel sheet from the optical system of the laser irradiation equipment. The steel support roll position control system 12 is the position of the luminance sensor 10, a spark between the brightness and the distance-measuring sensor actually measuring the optical system and calculates a distance between the surface of the steel sheet and the steel sheet support roll (9) (11) detected from to be more precisely controlled.
[87]
The skew of the control, the tension of the control plate and the support roll position conditioner serves to make the steel sheet in the condition of the laser irradiation position so as to form a groove in the laser precisely steel sheet by the laser irradiation equipment. In the steel sheet of the laser irradiation position it will be at the center position of a steel sheet production line and the central position to be maintained at a value of the distance to the optical system is set.
[88]
The laser irradiation equipment may include a laser oscillator controller 13, the laser oscillator 14, an optical system (15) for oscillating a continuous wave laser beam (16).
[89]
Also a, the optical system 15 as shown in 3, the driving for rotating the module plate 37, which is rotatably give the angle of the laser beam radiation on the steel plate width direction, the module plate 37 36, the module is provided on the plate 37 rotatably mounted on the laser oscillator 14, a header (39) for emitting an applied laser beam into the optical system 15 from the, module plate 37 header ( 39), a polygon mirror 32 for reflecting the emitted laser beam from, installed on the rotation motor 33, the module plate 37 for rotating the polygon mirror 32 is reflected by the polygon mirror 32, condensing mirror to reflect the laser beam 16 toward the steel sheet for condensing the steel sheet 35, a drive motor 34 which is connected to the condensing mirror 35 to move the condensing mirror 35 to adjust the focal length of the laser beam , to the module plate 37 The values ​​may include a shutter 38 for selectively blocking the module plate 37, depending on whether the laser beam irradiation.
[90]
The optical system 15 forms a header 39, a polygon mirror 32, a condenser mirror 35 and the shut is arranged a body in the module plate 37 constituting the optical box. A laser oscillator 14 and the header 39 is for example connected to the optical cable (41). Thus, the laser from the laser oscillator 14 is sent to a header (39) riding on an optical cable (41). In the interior of the module plate 37 constituting the optical box header 39 and the polygon mirror 32 and the condensing mirror 35 is disposed in position to reflect the desired location of the laser beam (16). 3, the example, the header (39) is arranged on both sides sandwiching the polygon mirror 32 may be a structure in which each emit a laser beam toward a polygon mirror 32, respectively. The two condensing mirror 35 is disposed in line with each of the laser beams reflected from the polygon mirror 32. The laser beam emitted from the header (39) is reflected by the polygon mirror 32 to rotate according to the drive of the rotary motor (33), into the condenser mirror (35). The laser beam reflected by the condenser mirror 35, 16 is reflected toward the steel plate through a shutter 38 at the condensing mirror 35 is focused on the steel plate (1) surface. Thus, the laser beam on the surface of the steel sheet is irradiated with periodically to form a continuous groove in the width direction.
[91]
Is adjusted by the vertical movement of the overall focal length steel support roll (9) of the laser beam 16 by the optical system 15, it is that the left and right focal length does not fit the drive motor (34 that is installed connected to the condenser mirror 35, ) it is controlled by the.
[92]
The shutter 38 is installed in the lower module plate 37 to open and close the module plate 37. The shutter 38 is opened, and prevent the laser beam and the interference, is closed when the laser beam is not irradiated of an external fumes or foreign objects optical system 15 when emitted from the condensing mirror 35 to the laser beam is lower inner and block flowing in.
[93]
When the amount of the steel sheet Sa excessive damage occurs while the steel sheet is free from a laser irradiation position laser is irradiated to the steel sheet support roll (9). Thus, the steel sheet to prevent the support roll damage, when the laser oscillator controller 13 is normally under operating conditions for a laser oscillator in the on (On) state, and the amount of steel sheet skew occurs more than 15mm controls the laser oscillator in the off (Off) state do.
[94]
The laser oscillator 14 may pass to the optical system (15) to oscillate a continuous wave laser beam is a Gaussian energy distribution (Gaussian energydistribution). The laser oscillator 14 may oscillate a single-mode continuous wave laser beam. An optical system 15 irradiates the laser beam 16 is transmitted to the surface of the steel sheet.
[95]
A laser oscillator 14 and the optical system 15, and at the same time by irradiating a laser beam on the steel sheet surface Sikkim the top width, bottom width and depth of the grooves within each 70㎛, 10㎛ within 3 to 30㎛, laser when irradiated may deliver the laser energy density in the 1.0 to 5.0 J / ㎟ range required for the melting of the steel sheet to produce high-value retake to remain in the molten parts of the inner groove wall surface to the steel sheet.
[96]
The optical system 15 may be adjusted there is a control for the laser scanning speed the spacing of the laser radiation (2 of 31) of 2 to 30 mm in the rolling direction. Therefore, to minimize the effect of heat affected zone (HAZ, Heat Affected Zone) by the laser beam it is possible to improve the iron loss of the steel sheet.
[97]
The laser irradiation equipment may be a structure for converting the radiation angle of the laser beam is irradiated on the surface of the steel sheet in the width direction of the steel sheet. The laser irradiation equipment in the present embodiment can convert the radiation angle of the laser beam with respect to the width direction of the steel sheet in the range of ± 4 °.
[98]
To this end, the laser irradiation equipment converts the optical system 15 for irradiating a laser beam on the steel sheet consists of a rotatable structure by the driver 36, to the radiation angle of the laser beam formed on the surface of the steel sheet in the width direction of the steel strip It may be a structure. By this way the radiation angle of the laser beam by the optical system is converted, by the laser beam radiation 31 is formed is inclined in a range of ± 4 ° about the perpendicular to the rolling direction of the steel sheet. Thus, it is possible to minimize the magnetic flux density decreases in accordance with the groove formed by the laser.
[99]
Further, in this embodiment, the laser irradiation equipment to control the irradiation position of the laser beam on the steel sheet 1, the laser beam is irradiated to the steel sheet is reflected by the plate to prevent back reflection phenomenon entering the optical system and a laser oscillator It has a structure.
[100]
To this end, the laser as illustrated in FIG irradiation equipment support plate supporting roll 9 to the surface of the steel sheet proceeds in contact with a circular arc shape on the surface, the irradiation direction of the laser beam irradiated from the optical system 15, the steel sheet roll 9 the laser beam to the irradiation position as a reference point (P), spaced apart for the reference point (P) steel support roll (9) ease of angle (hereinafter described in accordance with the outer surface in the center from the angle when passing the central axis of the ( with the referred to as R)) it may have the structure of irradiating a laser beam to the spaced apart position.
[101]
It said reference point (P) is steel support roll 9 in Figure 3 is the center point of the line passing through the steel sheet meets the axis. When the irradiation direction of the laser beam passing through the central axis of the steel support roll (9) the focal point of the laser beam is matched to the reference point (P). In this case, the steel support roll (9) according to yirum a tangent line at right angles with, a laser beam which is reflected right to the steel sheet as it is to enter the optical system and a laser oscillator back reflection phenomenon to damage in the irradiation direction of the laser beam reference point (P) this is generated.
[102]
The laser irradiation apparatus according to the present embodiment as described above, by irradiating a laser beam at a position spaced apart by a spacing angle (R) from the reference point (P), is a laser beam that is reflected back from the steel plate no longer incident on the optical system. Therefore, preventing the above-described back-reflection phenomenon and is able to maintain the quality of the groove shape formed by the laser beam.
[103]
In this embodiment, the spacing angle (R) may be set in a range of 3 to 7 ° along the outer surface in the central steel support roll (9) relative to the reference point (P).
[104]
If the laser beam is located in spaced-apart angle (R) being irradiated is less than 3 °, there is a part of the laser beam reflected back from the steel plate can be introduced into the optical system or the laser oscillator. The spacing angle (R) is not performed may occur when more than the 7 ° properly groove formed by the laser beam to form defects in the home.
[105]
In this way, the laser irradiation equipment of the present embodiment, by laser irradiation on the steel sheet at a predetermined angle apart points around the reference point (P), to prevent back-reflection phenomenon and will not interfere with the incident light path when a laser beam reflected to the laser beam the quality of the groove shape formed by can be maintained stably.
[106]
The laser irradiation equipment may further comprise a molten iron removal system for removing fumes and spatter generated in accordance with the laser beam is irradiated to the steel sheet.
[107]
A dust collecting hood (19A, 19B) to the molten iron removal system is removed by sucking the air knife 17, the fumes and molten iron by injecting compressed dry air to the home interior of the steel sheet to remove the molten steel remaining in the internal groove It can be included. The fumes generated during laser irradiation through the air knife and the dust collecting hood is removed it is possible to prevent the fumes from entering into the optical system. The air knife 17 injects compressed dry air having a pressure (Pa) having a predetermined size as a groove inside of the steel plate (1) to remove the molten steel remaining in the internal grooves. The dried compressed air from the air knife 17 kg 0.2 / cm 2 preferably has a pressure (Pa) or more. The pressure of the compressed air dry kg 0.2 / cm 2 is less than in the molten iron is because the removal of the inner groove can not be secured to the iron loss improvement effect. It is removed by a dust collecting hood (19A, 19B) to remove the fumes and disposed before and after the spare emitter laser irradiation position by the air knife.
[108]
In addition, the laser irradiation equipment may further include a shield 18 to block the reflected light and the scattered light and the radiant heat of the laser beam entering the optical system. The shielding part 18 by blocking the reflected light and the scattered light from entering the optical system by the reflection and scattering of the laser beam 16 is irradiated to the steel sheets, preventing the optical system is heated and thermal deformation by the radiation heat due to reflected light and scattered light do.
[109]
The laser room 20 is a room structure having an internal space, inside and to receive the laser irradiation equipment and the steel support roll position control equipment isolated from the outside, and provides a suitable operating environment for their smooth operation.
[110]
The respective inlet and outlet sides of the inlet and output of the laser room 20 is formed along the plate advancing direction. And the laser room 20 is provided with a facility to block contaminants from entering so that the internal space is not contaminated by external dust. To this end, the laser room 20 is provided with a positive pressure device (23) for increasing the pressure inside than outside. The positive pressure apparatus 23 is kept relatively high as the pressure inside the laser room (20) than the external pressure. Thus, in the foreign matter it can be prevented from entering the inside of the laser room (20). In addition, the inlet and outlet plates that are accessible is provided with an air curtain (22A, 22B, 22C, 22D). The air curtain will prevent that the steel sheet by forming a film by spraying air to the inlet and outlet passages pass through coming into the laser room 20, the dust or the like from flowing through the inlet and the outlet. Further, in order to prevent internal contamination of the laser room (20), the doorway of the door, the shower cubicle (21) of the laser room 20 may be provided. The shower cubicle 21 is to remove foreign matters adhering to the body of the incoming laser chulipja room 20.
[111]
The laser room 20 is a substantially a plate magnetic domain refinement process by the laser beam goes to the space, it is necessary to minimize the change in the internal environment and maintain a fair environment. To this end, the laser room 20 has a laser oscillator 14 and the optical system 15 such as the in the upper space of the steel sheet (1) is passing by the lower area and a separating optical system bottom frame 24 of the laser irradiation equipment, and laser and a room 20 temperature and humidity controller 25 for controlling the internal temperature and humidity.
[112]
The optical system bottom frame 24 is to be in complete control of the main equipment than the operating environment, such as a laser oscillator 14 and the optical system (15). The optical system bottom frame 24 is provided so as to separate the laser room 20, the steel plate passing through the optical system within the lower space and the laser oscillator and the optical system are a mirror optical system in the upper space. The laser room 20 in the internal optical system separately from the upper space separated by the optical system, the lower frame 24 to prevent contamination of the temperature and humidity control of the main equipment, such as a laser oscillator or an optical system becomes easier.
[113]
The constant temperature and humidity controller 25 to control the temperature and humidity in the room laser 20 provides the proper environment. The constant temperature and humidity controller 25 in this embodiment, keeping the internal temperature of the laser rooms 20 to 20 to 25 ℃, and it is possible to maintain the humidity below 50%.
[114]
In this way, the inner space of the laser room 20 is maintained to a suitable temperature and humidity to the working environment, so that a magnetic domain refining process on steel sheet can take place in optimal conditions. Therefore, it is possible to produce a high quality product under optimal operating conditions required for the process in bulk.
[115]
In this embodiment the magnetic domain refining apparatus, the treatment plant may further include after for removing hileop (up hill) and sputtering (spatter) formed on a surface of the steel sheet.
[116]
It may cause heel-up and spare emitter insulating space factor and deterioration of the products, by completely removed through the after treatment system can increase the product quality.
[117]
The post-processing equipment is arranged on the rear laser room 20 along the steel strip traveling direction may include a brush roll (26A, 26B) for removing the heel up and sputtering the surface of the steel sheet. The brush roll (26A, 26B) is driven and rotated at a high speed by a motor, a brush for controlling and adjusting the distance between the current control system that controls a current value of the drive motor which occurs when operating at the set target value, the brush roll and the steel plate position the distance between the rotation speed and the steel sheet is controlled by the control system. The brush roll is disposed only on one surface of the steel sheet or groove is formed by laser beam, it may be disposed on both surfaces of the steel sheet. The brush roll (26A, 26B) is to remove the heel up and attached to the surface of the steel sheet while being rotated at a high speed in close contact with the surface of the steel sheet, such as sputtering. 1, the dust collection hood, the brush roll (19C) for discharging the heel up and sputtering is removed by a brush roll in close proximity to (26A, 26B) are further provided. The dust collecting hood (19C) is to the suction of the molten iron, such as sputtering heel up and detached from the plate by the brush roll (26A, 26B) discharged to the outside.
[118]
In addition, the post-treatment equipment is clean unit 29 for removal by placing the reaction of the steel sheet alkali solution and the electrolysis in the rear end a brush roll (26A, 26B) added to the heel up and spatters remained in the steel sheet surface and, a clean unit the filtering unit 30 to filter out the foreign substances contained in the alkali solution the connection of the cleaning unit from the alkaline solution may further include.
[119]
Steel is primarily to heel up and spatter is removed through a brush roll (26A, 26B), over the cleaning unit 29 is left heel up and spatter secondarily removed. Thus, the more complete removal of the heel-up spatter adhered to the surface of the steel sheet can be increased product quality.
[120]
The cleaning unit 29 is filled with the alkali solution therein, a filter unit 30 at one side is connected. Is a heel-up and spatter removal from the steel sheet in an alkaline solution inside the accumulation process as a steel plate through the cleaning unit, the cleaning performance will drop of the steel sheet. The filter unit 30 is circulated to the alkali solution of the cleaning unit is removed while the heel up and spatters contained in the alkali solution. The filtering unit 30 removes the heel up and spatter manages the iron content of the alkali solution to below 500ppm. Thus, it is possible to prevent the cleaning performance of the cleaning unit it is possible to process the steel plate continuously.
[121]
Hereinafter, description about the magnetic domain refinement process of the electrical steel sheet according to the present embodiment as follows.
[122]
The steel sheet is successively transported to the laser enters the room interior via the skew of the control and tension control equipment will be presented in more than 2m / sec velocity, the magnetic domain refinement treatment. The steel plate enters the laser room inside is drawn out laser room after the permanent magnetic domain refinement treatment by laser irradiation equipment. The steel sheet pulled out by a laser outside the room is sent to the process after the heel up and spatter, etc. remaining on the surface after the working-up plants are removed.
[123]
In this process, the laser room where the laser irradiation on the steel sheet surface is conducted is properly set up and maintain an internal operating environment to provide an optimum environment for the magnetic domain refinement.
[124]
The laser room to isolate the inside and the outside is controlled to fit to block the influx of external contaminants, and the laser interior room temperature and operating environment for the magnetic domain refining to form a pressure and humidity.
[125]
Laser room is, to prevent foreign matter such as dust in the outside from entering into the room by keeping the laser to set to be higher as compared to the pressure inside and outside. In addition, it is possible to form a film by the air in the passage of the inlet and outlet plates are moved, the foreign matter such as dust in the course of the steel sheet proceeds through the inlet and the outlet to block the laser from being introduced into the room.
[126]
In addition, the constant temperature and humidity controller installed in the room is a laser by maintaining the temperature in the room to the laser 20 to 25 ℃ and keep the humidity below 50%, provides optimum conditions for magnetic domain refinement treatment by laser irradiation.
[127]
Thus there is provided an optimal environment for the laser beam irradiated by the laser room, the steel sheet goes through the skew of the control, the tension of the control, and the steel support roll position adjusting equipment is accurately positioning the laser irradiation position.
[128]
First, for the magnetic domain refining treatment steel sheet, the traveling direction is controlled by the skew control equipment is moved straight without being biased to the left or right along the production line center.
[129]
Skew measuring sensor thereby, and continuously detects the skew amount of the steel sheet, when the steel sheet is the skew, calculates the signal detected by the skew sensor to the steel sheet center position control system to rotate and move the axis of the steering roll to move the plate into place do. By doing this continuously controlling the steering roll in accordance with the position of steel plates, steel sheets continue to be able to move continuously without departing from the production line center.
[130]
Steel sheet is moved through the tension bridle rolls for adjusting tension through the steering roll. Tension of the last plate of the tension bridle rolls is detected by the tension sensor. Steel tension control system controls the speed of the bridle rolls mapchwo tension to the tension set by calculating the measured value detected by the tension sensor. Thus, it is possible constantly to maintain at the set tension of the moving range of the steel sheet.
[131]
Steel plate subjected to tension the bridle roll is introduced into the laser room interior through the inlet of the laser room. Steel sheet is moved in a state of being in close contact with the steel sheet support roll is located between the switching directions by the bridle roll inside room laser two bridle rolls.
[132]
The steel support roll to thereby move the plate up and down position of the steel sheet within a depth of focus of the laser beam.
[133]
When the laser beam is irradiated to the steel sheet from the laser irradiation equipment luminance measuring sensor by the movement of the steel support roll position control system a steel support roll according to the measured value detected by the flame brightness measuring sensor detecting in real time, and the brightness of the surface of the steel sheet up and down the steel sheet to a position within the focal depth of the laser beam. Thus, the laser beam is irradiated on the surface of the steel sheet effectively can be formed a high-quality radiation.
[134]
The laser oscillator controller turns on / off the laser oscillator depending on the degree of meandering of the steel sheet. The laser oscillator controller is coupled to the skew measuring sensor, for example, the amount of meandering of the steel sheet measured by the skew sensor, turning off (off) the laser oscillator is determined that the steel sheet is out too much of the steel support roll is above 15mm. Thus, the steel sheet is irradiated through the support roll the surface of the laser beam is meandering steel sheet can be prevented from being damaged roll.
[135]
Depending on the command controller of the laser oscillator of the laser beam generated by the laser oscillator it is irradiated to the steel sheet surface through the optical system. TEM laser oscillator 00 is transmitted to the optical system to oscillate a continuous wave laser beam.
[136]
Optical system by irradiating laser to the surface of the steel sheet by switching the direction of the laser beam, the magnetic domain refinement treatment to form a continuous groove in the melt on the surface of the steel sheet.
[137]
As the molten steel surface by the laser beam is irradiated through the optical system to the steel sheet along the radiation is formed in the melt groove. In this embodiment, the top width, bottom width and depth is within each 70㎛, 10㎛ within, at the same time the melt during the laser irradiation and Sikkim form a 3 to 30㎛ the groove portion groove inner wall surface of the steel sheet by the laser beam irradiation to retake high value so that the residual generation, a laser oscillator and an optical system transmits the laser energy density in the 1.0 to 5.0J / ㎟ range required for the melting of the steel sheet in the steel sheet.
[138]
Further, by irradiating a laser beam at a position spaced apart from the reference point in the laser beam irradiation process through the optical system, and the laser beam is reflected back from the steel plate no longer incident on the optical system. Therefore, to prevent the above phenomenon, and the back reflection by the reflection light does not interfere with the incident light path of the laser beam it is possible to maintain the quality of the groove shape formed by the laser beam.
[139]
The optical system here is a control for the laser scan speed can be adjusted a distance of the laser radiation to the rolling direction. Further, the optical system may be provided with a function to change the rotation angle of the laser radiation. In the present embodiment, to improve the core loss of the steel sheet to minimize the effects of the heat affected zone (HAZ, Heat Affected Zone) by the laser beam by making it possible to adjust the distance of the laser radiation in the rolling direction of 2 to 30mm by the optical system have. Further, it is possible to convert the radiation angle of the laser beam is irradiated on the surface of the steel sheet through the rotation of the optical system in the laser beam irradiation process. In the present embodiment, the optical system can be converted to a range of ± 4 ° about the radiation angle of the laser beam in the width direction of the steel sheet. That is, it can be tilted in a range of ± 4 ° about the y-axis direction from the second to form the radiation 31 of the laser beam. This radiation is formed on the surface of the steel sheet may be formed inclined in the range of 86 to 94 ° to the rolling direction. In this way formed at an angle to the radiation in the y-axis direction, it is possible to minimize the magnetic flux density decreases in accordance with the groove formed by the laser.
[140]
In the laser beam irradiation process, while the steel sheet is melted by the laser beam, a large amount of fume and spatter molten iron is generated. Fume and spatter contaminates the emitter optical system, when the molten iron remains in the internal grooves is difficult to form a precise home gaeson not it is the iron loss is made to inhibit the product quality. Thus, by injecting a compressed dry air to the inside groove of the steel sheet to remove the molten iron to remain within the grooves, and removing immediately the fume suction and the molten iron through a dust collecting hood. Thus, prevents the fumes from entering into the optical system of the steel magnetic domain refining process, it is possible to increase the efficiency of the magnetic domain refinement treatment by rapidly removing the fumes and spatters. In addition, the scattered light and the heat of the laser beam from the laser beam irradiation process can be further cut off from being introduced into the optical system of the laser irradiation equipment.
[141]
A groove on the steel sheet surface through a laser beam and processed as magnetic domain refinement formed, the magnetic domain refinement treatment steel sheet is moved continuously through the outlet of the laser room discharged to the outside.
[142]
A discharge plate at room laser is subjected to the process of removing the heel up and spatters adhered on the surface of the steel sheet after the post-treatment process.
[143]
Steel sheet is first over a brush roll disposed in the room outside the laser, it is in close contact with the steel sheet is high-speed primarily by removing the heel up and spatter by a brush roll rotating in.
[144]
Steel sheet subjected to the brush roll is a heel-up and spatter which secondarily while passing through the cleaning unit remains through the electrolysis reaction of the steel with an alkaline solution and finally removed. Over the course of clean-up and heel unit spare the foundation plate has been removed is transferred to the subsequent step.
[145]
TABLE 1
Core loss improvement rate (%)
After laser irradiation After heat treatment
9.5 11.6
9.7 12.9
11.5 13.5
8.4 11.6
8.6 11.8
8.5 11.7

[146]
Table 1 shows the core loss improvement rate of the grain-oriented electrical steel sheet according to the groove formed on the surface of the steel sheet of 0.27mm thickness by the continuous wave laser beam irradiation according to the present embodiment. As shown in Table 1, it can be seen the present embodiment, the magnetic domain refinement when the processed steel sheet after laser irradiation, and the iron loss is improved both after magnetic domain refinement by a laser heat treatment and over.
[147]
Although an example is illustrated an exemplary embodiment of the invention described as mentioned above, there will be various modifications and other embodiments may be made by those skilled in the art. Exemplary such modifications and other embodiments are to be considered all included in the scope of the appended claims, it will not depart from the true spirit and scope of the invention.

WE CLAIM

[Claim 1] While supporting the steel sheet by irradiating a plate adjustment support roll position step, the laser beam for controlling the vertical position of the steel sheet by melting the steel which the laser irradiation method comprising: forming grooves on the surface of the steel plate, and laser irradiation is conducted magnetic domain refining method of the grain-oriented electrical steel sheet, which includes setting a holding step of setting and maintaining the internal operating environment of the laser room.
[Claim 2]
The method of claim 1, wherein the steel sheet is the magnetic domain refining method of the grain-oriented electrical steel sheet further includes a skew control step of causing the mobile without the bias to the left or right along the production line center.
[Claim 3]
The method of claim 1, wherein the magnetic domain refining method of holding the steel sheet to be flat expanded state oriented electrical steel sheet further comprising a tension control step of giving a tension to the steel sheet.
[Claim 4]
The method according to any one of claims 1 to 3, wherein the holding said setting step, to the laser room interior isolated from the outside the step of blocking the entry of external contaminants, and which controls the laser room inside temperature and pressure and humidity magnetic domain refining method of the grain-oriented electrical steel sheet comprising the steps:
[Claim 5]
5. The method of claim 4, hileop through the laser irradiation step is formed on the surface of the steel strip (up hill) and magnetic domain refining method of the spatter-oriented electrical steel sheet further comprising a processing step for removing the post (spatter).
[Claim 6]
The method of claim 5, wherein the post-treatment step is the magnetic domain refining method of the grain-oriented electrical steel sheet comprising the brush removing the heel up and spatters deposited on the brush roll to the steel sheet surface.
[Claim 7]
The method of claim 6, wherein the post-treatment step, is removed the steel by reacting the alkali solution and the electrolysis and purity adding remove the heel up and spatters remained in the surface of the steel sheet, from the steel sheet in a clean step included in the alkali solution directional further comprising a filtering step to filter out the foreign substances from the alkali solution, the magnetic domain refinement method of an electrical steel sheet.
[Claim 8]
The method of claim 4, wherein the laser irradiation step, the steel support roll reference point the laser beam irradiation position at the time for the surface of the steel sheet is conducted in contact with a circular arc shape on the surface, the irradiation direction of the laser beam over the center axis of the steel support roll in the steel sheet to the support roll with the angle along the outer circumferential surface spaced from the center position in the reference point, the magnetic domain refining method of the grain-oriented electrical steel sheet which is irradiated with a laser beam.
[Claim 9]
10. The method of claim 8, wherein, in said laser irradiation step, the laser beam domain refining method of the grain-oriented electrical steel sheet to be irradiated in the range from 3 to 7 ° and spaced about along the outer circumferential surface of the steel support roll centered on the reference point.
[Claim 10]
The method of claim 4, wherein the laser irradiation step, the magnetic domain refining method of the grain-oriented electrical steel sheet further comprises an angle conversion step of converting the radiation angle of the laser beam is irradiated on the surface of the steel sheet.
[Claim 11]
11. The method of claim 10, wherein the angle conversion step, the magnetic domain refining method of the grain-oriented electrical steel sheet, which converts the radiation angle of the laser beam in the range of ± 4 ° with respect to the width direction of the steel sheet.
[Claim 12]
The method of claim 4, wherein the laser irradiation step, a laser beam with the groove inside the blocking step, the steel sheet to block the fume (fume) generated upon irradiation by spraying with compressed dry air to remove the molten steel remaining in the internal groove spraying step, the magnetic domain refinement process of fumes and oriented electrical steel sheet comprising a dust collection step of removing by suction the molten iron.
[Claim 13]
The method of claim 4, wherein the laser irradiation step is magnetic domain refining method of a laser beam scattering and grain-oriented electrical steel sheet which comprises a heat blocking step to block from entering the optical system of the laser irradiation equipment.
[Claim 14]
While supporting the steel sheet by irradiating a plate adjustment support roll position equipment, the laser beam for controlling the vertical position of the steel plate to melt a steel sheet with a laser irradiation equipment, and the steel support roll position adjusting equipment for forming a groove on the surface of the steel strip It isolated the laser irradiation equipment from the outside receiving device, and the directional magnetic domain refinement of electrical steel sheet comprising a laser for providing an operating room environment for the laser irradiation.
[Claim 15]
The method of claim 14, wherein the directional magnetic domain refinement apparatus of the electrical steel sheet further comprising a skew of the control to be taken without the steel sheet is biased to the left or right along the production line center.
[Claim 16]
The method of claim 14, wherein the directional magnetic domain refinement apparatus of the electrical steel sheet further comprising a tension control equipment to keep the tension to be given to the steel sheet to the steel sheet to a flat unfolded state.
[Claim 17]
Claim 14 to 16 according to any one of claims, wherein the laser room amount along the direction of movement of, the steel plate forming the inner space so that isolated from the outside by receiving the laser irradiation equipment and the steel support roll position of the control side is formed with an inlet and an outlet, inside the laser room to the space above the optical system is located in a positive pressure device, a laser irradiation equipment for increasing the internal pressure than the outer steel sheet is separated and passes the lower space optical system, the lower frame, and a laser room inside temperature directional magnetic domain refinement apparatus of the electrical steel sheet comprising a constant temperature and humidity controller for controlling humidity.
[Claim 18]
18. The method of claim 17, hileop (up hill) and the sputtering apparatus further comprising: directional magnetic domain refinement of electrical steel to the treatment plant and then to remove the (spatter) formed on a surface of the steel sheet.
[Claim 19]
19. The method of claim 18, wherein the post-processing equipment are the magnetic domain refinement apparatus of the grain-oriented electrical steel sheet that is disposed on the rear end comprises a laser room brush roll to eliminate the heel up and sputtering the surface of the steel sheet.
[Claim 20]
The method of claim 19, wherein the processing equipment is arranged at the rear end a brush roll connecting the steel sheet in an alkaline solution and electrolytic reaction by the clean unit and clean unit for additional removal of heel-up and spatters remained in the surface of the steel sheet wherein after cleaning unit a directional magnetic domain refinement apparatus of the electrical steel sheet further comprises the embedded foreign matter filter portion to filter out from the alkaline solution into the alkali solution.
[Claim 21]
18. The method of claim 17 wherein the optical system is comprised of a rotatable structure by the driver, by rotating the magnetic domain refinement apparatus of the grain-oriented electrical steel sheet of a structure for converting the radiation angle of the laser beam with respect to the width direction of the steel sheet for steel plate.
[Claim 22]
18. The method of claim 17 wherein the laser irradiation equipment, a directional magnetic domain refinement apparatus of the electrical steel sheet containing molten iron removal system for removing fumes and spatter generated in accordance with the laser beam is irradiated to the steel sheet.
[Claim 23]
The method of claim 17, wherein the shielding directional magnetic domain refinement apparatus of the electrical steel sheet containing portion in which the laser irradiation equipment can block the laser beam and the scattered light from entering the optical system.
[Claim 24]
18. The method of claim 17 wherein the laser irradiation equipment includes a dust hood to remove by suction the air knife, and fumes and molten iron by injecting compressed dry air to the home interior of the steel sheet to remove the molten steel remaining in the internal groove directional magnetic domain refinement apparatus of the electrical steel sheet.