WO2016105048A1 - 강판 표면 홈 형성 방법 및 그 장치 - Google Patents
강판 표면 홈 형성 방법 및 그 장치 Download PDFInfo
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- WO2016105048A1 WO2016105048A1 PCT/KR2015/014019 KR2015014019W WO2016105048A1 WO 2016105048 A1 WO2016105048 A1 WO 2016105048A1 KR 2015014019 W KR2015014019 W KR 2015014019W WO 2016105048 A1 WO2016105048 A1 WO 2016105048A1
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- WIPO (PCT)
- Prior art keywords
- steel sheet
- groove
- mirror
- scanning mirror
- laser beam
- Prior art date
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Classifications
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- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/36—Removing material
- B23K26/362—Laser etching
- B23K26/364—Laser etching for making a groove or trench, e.g. for scribing a break initiation groove
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/02—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
-
- 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
- B23K26/0604—Shaping the laser beam, e.g. by masks or multi-focusing by a combination of beams
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/08—Devices involving relative movement between laser beam and workpiece
- B23K26/082—Scanning systems, i.e. devices involving movement of the laser beam relative to the laser head
- B23K26/0821—Scanning systems, i.e. devices involving movement of the laser beam relative to the laser head using multifaceted mirrors, e.g. polygonal mirror
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/352—Working by laser beam, e.g. welding, cutting or boring for surface treatment
- B23K26/359—Working by laser beam, e.g. welding, cutting or boring for surface treatment by providing a line or line pattern, e.g. a dotted break initiation line
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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 by deformation combined with, or followed by, heat treatment
- C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
- C21D8/1294—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties involving a localized treatment
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- 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
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/02—Iron or ferrous alloys
- B23K2103/04—Steel or steel alloys
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S438/00—Semiconductor device manufacturing: process
- Y10S438/94—Laser ablative material removal
Definitions
- the present invention relates to a method and apparatus for forming a steel sheet surface groove, and more particularly, by forming grooves on the steel sheet surface by laser irradiation regardless of the oscillation method and beam mode, so that the iron loss improvement effect can be improved regardless of the heat treatment.
- the present invention relates to a method for forming a steel plate surface groove and an apparatus thereof capable of maximizing iron loss improvement rates applicable to a directional electrical steel sheet process before and after primary recrystallization.
- a grain-oriented electrical steel sheet is widely used as an iron core material for energy conversion of an electric device such as a transformer, which is intended to selectively induce a magnetic field in the rolling direction by developing an aggregate structure having a biaxial axis for magnetization in the rolling direction.
- a grain-oriented electrical steel sheet refers to a material having an aggregate structure (also called “Goss Texture”) oriented in the ⁇ 110 ⁇ ⁇ 001> direction in the rolling direction through hot rolling, cold rolling and annealing processes.
- the ⁇ 110 ⁇ ⁇ 001> direction is superior in magnetic properties as the degree of orientation of iron in the biaxial direction of magnetization is higher.
- the magnetic micronization method is a technique used to improve the magnetic properties of oriented electrical steel sheets.
- the magnetic micronization method can be classified into temporary magnetic micronization and permanent magnetic micronization according to whether or not to maintain magnetic micronization effect even after stress relief annealing. .
- Permanent domain micronization method which can maintain iron loss improvement effect after heat treatment can be divided into etching method, roll method and laser method.
- the etching method is difficult to control the groove shape because the groove is formed on the surface of the steel sheet by the electrochemical corrosion reaction in acid solution in the solution, and because the groove is formed in the intermediate process (pre-carbon annealing, before high temperature annealing) to produce the steel sheet. It is difficult to guarantee the iron loss characteristics of the final product and it is not environmentally friendly because acid solution is used, and it is difficult to form grooves at high speed in order to form an appropriate groove depth on the surface of steel sheet.
- Permanent magnetization by rolls is a magnetization technique that forms a groove with a certain width and depth on the surface of the steel sheet by pressing to process the projection shape on the rolls to secure stability in machining and stable iron loss according to thickness. It is difficult to do this and the groove forming process has a complicated disadvantage.
- the grooved permanent micronization method by laser irradiation not only secures the micronized effect before heat treatment, but also has the disadvantage of deteriorating magnetic flux density after magnetic domains.
- the laser method using a laser beam of monochromatic light has the advantage of forming a relatively stable groove at a relatively low line speed of the steel sheet compared to the etching and roll method.
- the optical system design considering the thermal stability of the mirror and the solution of the optical system configuration method by simplifying the mirror configuration Is not presented.
- the present invention can improve the iron loss improvement effect regardless of heat treatment by forming grooves on the surface of the steel sheet by laser irradiation regardless of the oscillation method and the beam mode. It is an object of the present invention to provide a method for forming a steel plate surface groove and an apparatus thereof.
- a laser beam from a plurality of laser oscillators are irradiated to the scanning mirror and passed through the scanning mirror after the
- the surface of steel sheet has the characteristics of improving the iron loss before and after heat treatment by minimizing the heat effect of the groove at a high line speed of 20mpm or more.
- a groove forming method may be provided.
- the scanning mirror may have four or more incident surfaces on which a laser beam may be incident.
- the laser beam irradiated to the scanning mirror may be focused on the condenser mirror and then irradiated onto the surface of the steel sheet.
- the laser beam irradiated to the scanning mirror may be incident on two or less shape mirrors, and then may be focused on the light converging mirror through the shape mirror and irradiated onto the surface of the steel sheet.
- two or more and four laser beams may share one scanning mirror.
- the linear groove with one irradiation line on the surface of the steel sheet by irradiation of the laser beam through the scanning mirror it may be composed of two or less shape mirrors and one condensing mirror.
- a steel plate surface groove forming apparatus may be provided, which includes a scan mirror irradiated with a laser beam from a plurality of laser oscillators and shares with two or more laser beams.
- It may include a focusing mirror for focusing the laser beam reflected from the scanning mirror to the surface of the steel sheet.
- the laser beam reflected from the scanning mirror may be incident, and may include two or less shaping mirrors that reflect the incident laser beam to the condensing mirror.
- the scanning mirror may be formed in a polyhedron shape having four or more incidence planes through which a laser beam may be incident.
- two or more and four laser beams may share one scanning mirror.
- the linear groove with one irradiation line on the surface of the steel sheet by irradiation of the laser beam through the scanning mirror it may be composed of two or less shape mirrors and one condensing mirror.
- a groove depth of 10% or less of the steel sheet thickness is divided into 3 to 8 parts in a direction of ⁇ 82 to ⁇ 98 ° with respect to the rolling direction of the steel sheet on the surface of the electrical steel sheet moving at 0.33 m / s or more. It is possible to manufacture a low iron loss high magnetic flux density oriented electrical steel sheet micronized product having the characteristics of improving iron loss more than 10% before and after heat treatment without affecting the primary and secondary recrystallization by the groove while forming the linear groove. .
- FIG. 1 is a schematic configuration diagram of a steel sheet surface groove forming apparatus according to an embodiment of the present invention.
- FIG. 2 is a schematic configuration diagram of an optical system of a steel plate surface groove forming apparatus according to an embodiment of the present invention.
- FIG 3 is a view showing a linear groove formed on the surface of the steel sheet according to the steel sheet surface groove forming apparatus according to an embodiment of the present invention.
- FIG. 4 is an enlarged view of a continuous groove shape of the linear groove formed on the surface of the steel sheet of FIG. 3.
- the present invention forms a groove in the plate width direction when irradiating a high-power laser at a high speed line speed of 20mpm or more in a method for minimizing iron loss by forming grooves on the surface of the steel sheet by laser irradiation, and maintaining and repairing the optical system.
- to reduce the scanning width by increasing the number of scanning mirrors to cope with the high line speed it is widely used.However, to minimize the processing cost and operating cost of the optical system including the scanning mirrors, the number of scanning mirrors is minimized. need. If the width of the steel sheet to be irradiated to the scanning mirror increases, the number of gaze mirrors to scan as the width is increased inevitably increases.
- the scanning mirror can be shared by several oscillators to maximize the depth of the grooves formed on the surface of the plate.
- the grooves formed on the surface of the steel sheet moving at a speed of 20mpm or more are preferably formed to a depth within about 10% of the sheet thickness. It is reasonable to increase the output.
- the plate surface groove formation can form a primary groove by a low-power laser, and by forming a secondary groove, the power limitation of the laser for forming the groove can be relaxed and the thermal effect around the groove can be minimized.
- the present invention improves the iron loss of the electrical steel sheet by forming grooves at a depth of 10% or less of the steel sheet thickness at ⁇ 82 to ⁇ 98 ° in the steel sheet rolling (length) direction on the surface of the electrical steel sheet having a width of 900 mm or more that moves at a high speed of 20mpm or more. It is to let.
- the groove forming target material may include all steels, wood, plastics, wafers, glass and ceramic materials.
- an electric steel sheet will be described as an example of the target material for forming the grooves.
- FIG. 1 is a schematic configuration diagram of a steel sheet surface groove forming apparatus according to an embodiment of the present invention
- Figure 2 is a schematic configuration diagram of an optical system of the steel sheet surface groove forming apparatus according to an embodiment of the present invention
- Figure 3 Is a view showing a linear groove formed on the surface of the steel sheet according to the steel sheet surface groove forming apparatus according to an embodiment of the present invention
- Figure 4 is an enlarged view of the continuous groove shape of the linear groove formed on the surface of the steel sheet of FIG.
- the laser beam 1 is formed from a plurality of laser oscillators by the scanning mirror 2.
- a high speed line speed of 20mpm or more is shared by sharing one scanning mirror 2 with two or more laser beams 1. speed) to minimize the thermal effect of the groove portion can have the iron loss improvement characteristics before (after) heat treatment.
- One scanning mirror 2 is shared with two or more laser beams 1, preferably with two to six laser beams.
- the scanning mirror 2 may be formed in a polyhedron shape having four or more laser beam incidence surfaces through which two or more laser beams can be incident so as to be shared with two or more laser beams 1.
- the laser beam 1 irradiated to the scanning mirror 2 may be focused on the condensing mirror 4 and then irradiated onto the surface of the steel sheet.
- the laser beam 1 irradiated to the scanning mirror 2 is incident on two or less shape mirrors 3, passes through the shape mirrors 3, and then is focused on a condensing mirror 4, so that the surface of the steel sheet Can be investigated.
- the laser beam 1 is irradiated from a plurality of laser oscillators, and includes a scan mirror 1 which is shared with two or more laser beams. can do.
- it may include a focusing mirror (4) for condensing the laser beam (1) reflected by the scanning mirror (2) to irradiate the surface of the steel sheet.
- the laser beam 1 reflected from the scanning mirror 2 is incident, and no more than two shaping mirrors 3 reflecting the incident laser beam 1 on the condensing mirror 4. ) May be included.
- the shape mirror 3 of FIG. 2 can be omitted when changing the shape of the final laser beam 1.
- One rotary scanning mirror 2 is shared with two or more laser beams 1, preferably with two to six laser beams.
- the scanning mirror 2 may be formed in a polyhedron shape having four or more laser beam incidence surfaces through which two or more laser beams can be incident so as to be shared with two or more laser beams 1.
- FIG. 2 schematically shows an optical system configuration (10 of FIG. 1) for one laser beam irradiated from the laser oscillator shown in FIG. 1.
- the laser beam 1 irradiated from the laser oscillator deforms the shape of the laser beam 1 via the scanning mirror 2, the shape mirror 3, and the condensing mirror 4, thereby giving four periods to the steel plate surface of FIG. 3.
- the above continuous linear grooves (5 in FIG. 3) are formed.
- the linear grooves irradiated from one scanning mirror 2 appear almost straight, thereby forming linear grooves as if they were irradiated from two scanning mirrors 2 in the steel sheet.
- the divided linear grooves appearing on the surface of the steel sheet appear to be separated into two largely as shown in FIG. If necessary, the position and number of laser beams incident on the scanning mirror 2 may be selectively selected.
- FIG. 4 is an enlarged representation of the continuous groove shape of the linear groove formed on the surface of the steel sheet of FIG.
- the irradiation interval Ds named as the distance between the linear groove and the linear groove can form the groove in two ways.
- linear grooves by the irradiation beams of the upper left and upper right appear on the same line. Therefore, the depth of the linear grooves can be formed deeper by using a low-power laser, and the heat effect generated in the grooves can be minimized. That is, when the laser energy density required to form a groove about 15 ⁇ m deep on the surface of a 0.23 mm thick oriented electrical steel sheet moving at a speed of 20 mpm, for example, is 1.2 J / mm 2, the required laser power is 900 W. Each laser output required to form a linear groove on the grooved surface again to form a final groove depth of 15 ⁇ m can minimize the thermal effect of the groove. Since the heat effect of the groove formed on the surface of the steel sheet is proportional to the laser output, the heat effect around the groove decreases when the laser output decreases.
- the scanning mirror 2 of FIG. 1 is arranged so that the upper grooves of the upper left end and the upper right end of the scanning mirror 2 cross each other. Irradiating the linear grooves to cross each other has the advantage that the linear grooves can be formed on the surface of the steel sheet at a higher speed.
- Table 1 shows the results of groove depth and iron loss improvement rate when the scanning mirror is shared on a 0.23 mm thick steel plate moving at 0.83 m / s.
- B 8 (Telsa) is the magnetic flux density value in Telsa when the magnetic field strength is 800 amp (amps) / m
- W17 / 50 (W / Kg) is the magnetic flux density value of 1.7 Telsa.
- the iron loss value is shown when the frequency is 50 Hz.
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Abstract
Description
Claims (12)
- 레이저 조사로 강판 두께의 10% 이하의 홈 깊이를 강판 표면에 형성하기 위하여, 다수개의 레이저 발진기로부터 레이저 빔이 주사 미러에 조사되고 상기 주사 미러를 통과한 후 상기 강판 표면에 조사되는 경우에 1개의 주사 미러를 2개 이상의 레이저 빔과 공유함으로써 20mpm 이상의 고속의 라인 스피드(line speed)에서 홈 부의 열영향을 최소화시켜 열처리 전(후) 철손 개선 특성을 갖는 강판 표면 홈 형성 방법.
- 제1항에 있어서,상기 주사 미러는 2개 이상의 레이저 빔과 공유될 수 있는 4개 이상의 레이저 빔 입사면을 갖는 강판 표면 홈 형성 방법.
- 제2항에 있어서,상기 주사 미러에 조사된 레이저 빔은 집광 미러에 집광된 후 상기 강판 표면에 조사되는 강판 표면 홈 형성 방법.
- 제3항에 있어서,상기 주사 미러에 조사된 레이저 빔은 2개 이하의 형상 미러에 입사된 후 상기 형상 미러를 통하여 집광 미러에 집광되어 상기 강판 표면에 조사되는 강판 표면 홈 형성 방법.
- 제3항 또는 제4항에 있어서,상기 주사 미러를 통한 레이저 빔의 조사에 의하여 강판 표면에 1개의 조사선으로 선상 홈을 형성시킴에 있어서, 1개의 주사 미러를 2개 이상 4개 이하의 레이저 빔이 공유하는 강판 표면 홈 형성 방법.
- 제4항에 있어서,상기 주사 미러를 통한 상기 레이저 빔의 조사에 의하여 강판 표면에 1개의 조사선으로 선상 홈을 형성시킴에 있어서, 2개 이하의 형상 미러 및 1개의 집광 미러로 구성되는 강판 표면 홈 형성 방법.
- 레이저 조사로 강판 두께의 10% 이하의 홈 깊이를 강판 표면에 형성 시 20mpm 이상의 고속의 라인 스피드(line speed)에서 홈 부의 열영향을 최소화시켜 열처리 전(후) 철손 개선 특성을 가질 수 있도록 하기 위하여,다수개의 레이저 발진기로부터 레이저 빔이 조사되고, 2개 이상의 레이저 빔과 공유하는 회전 주사 미러(scan mirror)를 포함하는 강판 표면 홈 형성 장치.
- 제7항에 있어서,상기 주사 미러에서 반사되는 레이저 빔을 집광하여 강판 표면에 조사하기 위한 집광 미러(focusing mirror)를 포함하는 강판 표면 홈 형성 장치.
- 제8항에 있어서,상기 주사 미러에서 반사되는 레이저 빔이 입사되고, 상기 입사된 레이저 빔을 상기 집광 미러(shaping mirror)에 반사하는 형상 미러를 포함하는 강판 표면 홈 형성 장치.
- 제8항 또는 제9항에 있어서,상기 주사 미러는 2개 이상의 레이저 빔과 공유될 수 있는 4개 이상의 레이저 빔 입사면을 갖는 다면체 형태로 형성되는 강판 표면 홈 형성 장치.
- 제10항에 있어서,상기 주사 미러를 통한 레이저 빔의 조사에 의하여 강판 표면에 1개의 조사선으로 선상 홈을 형성시킴에 있어서, 1개의 주사 미러를 2개 이상 4개 이하의 레이저 빔이 공유하는 강판 표면 홈 형성 장치.
- 제9항에 있어서,상기 주사 미러를 통한 상기 레이저 빔의 조사에 의하여 강판 표면에 1개의 조사선으로 선상 홈을 형성시킴에 있어서, 2개 이하의 형상 미러 및 1개의 집광 미러로 구성되는 강판 표면 홈 형성 장치.
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
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JP2017533450A JP6482671B2 (ja) | 2014-12-24 | 2015-12-21 | 鋼板表面の溝形成方法およびその装置 |
EP15873575.3A EP3238870A4 (en) | 2014-12-24 | 2015-12-21 | Method for forming groove in surface of steel plate, and apparatus therefor |
CA2972224A CA2972224A1 (en) | 2014-12-24 | 2015-12-21 | Method for forming groove in surface of steel plate, and apparatus therefor |
US15/539,628 US20170348802A1 (en) | 2014-12-24 | 2015-12-21 | Method for forming groove in surface of steel plate, and apparatus therefor |
CN201580071216.XA CN107690368B (zh) | 2014-12-24 | 2015-12-21 | 在钢板表面形成凹槽的方法及其装置 |
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KR1020140188976A KR101711853B1 (ko) | 2014-12-24 | 2014-12-24 | 강판 표면 홈 형성 방법 및 그 장치 |
KR10-2014-0188976 | 2014-12-24 |
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WO2016105048A1 true WO2016105048A1 (ko) | 2016-06-30 |
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US (1) | US20170348802A1 (ko) |
EP (1) | EP3238870A4 (ko) |
JP (1) | JP6482671B2 (ko) |
KR (1) | KR101711853B1 (ko) |
CN (1) | CN107690368B (ko) |
CA (1) | CA2972224A1 (ko) |
WO (1) | WO2016105048A1 (ko) |
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CN110323044B (zh) * | 2018-03-30 | 2021-02-19 | 宝山钢铁股份有限公司 | 一种耐热磁畴细化型取向硅钢及其制造方法 |
CN111185693A (zh) * | 2020-01-13 | 2020-05-22 | 哈尔滨锅炉厂有限责任公司 | 一种用于焊接弧形管片的mpm生产线滚轮 |
CN116981977A (zh) | 2021-03-30 | 2023-10-31 | 日本制铁株式会社 | 激光扫描装置、激光扫描方法、激光加工装置以及电磁钢板的制造方法 |
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Also Published As
Publication number | Publication date |
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JP2018507111A (ja) | 2018-03-15 |
CN107690368A (zh) | 2018-02-13 |
KR20160078151A (ko) | 2016-07-04 |
CA2972224A1 (en) | 2016-06-30 |
JP6482671B2 (ja) | 2019-03-13 |
EP3238870A1 (en) | 2017-11-01 |
US20170348802A1 (en) | 2017-12-07 |
EP3238870A4 (en) | 2018-02-21 |
KR101711853B1 (ko) | 2017-03-03 |
CN107690368B (zh) | 2020-04-03 |
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