WO2017111417A1 - Dispositif de traitement de surface de tôle d'acier et procédé de traitement de surface - Google Patents

Dispositif de traitement de surface de tôle d'acier et procédé de traitement de surface Download PDF

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Publication number
WO2017111417A1
WO2017111417A1 PCT/KR2016/014905 KR2016014905W WO2017111417A1 WO 2017111417 A1 WO2017111417 A1 WO 2017111417A1 KR 2016014905 W KR2016014905 W KR 2016014905W WO 2017111417 A1 WO2017111417 A1 WO 2017111417A1
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WO
WIPO (PCT)
Prior art keywords
steel sheet
laser line
surface treatment
laser
irradiator
Prior art date
Application number
PCT/KR2016/014905
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English (en)
Korean (ko)
Inventor
권영섭
Original Assignee
주식회사 포스코
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 주식회사 포스코 filed Critical 주식회사 포스코
Publication of WO2017111417A1 publication Critical patent/WO2017111417A1/fr

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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/70—Auxiliary operations or equipment
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/06—Surface hardening
    • C21D1/09—Surface hardening by direct application of electrical or wave energy; by particle radiation
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D10/00—Modifying the physical properties by methods other than heat treatment or deformation

Definitions

  • the present invention relates to a surface treatment apparatus and a surface treatment method of a steel sheet. More specifically, the present invention relates to a surface treatment apparatus and a surface treatment method of a steel sheet using a high power laser.
  • the carbon steel sheet is changing the characteristics of the steel sheet by passing through an annealing furnace and a cooling device, and this process takes a long time of heating, maintaining and cooling, and also affects the inside of the carbon steel sheet. There is a problem that productivity and cost are high.
  • FIG. 1 is a view schematically showing a method of surface treatment of a steel sheet using a laser beam.
  • the surface treatment method of a steel sheet using a laser beam is a scanning surface treatment method of irradiating a focused energy, that is, a point laser beam, while moving reciprocally in the width direction of the steel sheet.
  • the method of surface treatment by irradiating the point laser beam has a problem that takes a long time in the surface treatment process by reciprocating in the width direction of the steel sheet and irradiating the laser beam, it is applied to the surface treatment of large area steel sheet There is a problem that is difficult to do.
  • One aspect of the present invention is to provide a surface treatment apparatus and a surface treatment method of a carbon steel sheet using a high power laser.
  • the moving part for moving the steel plate And a laser line irradiator positioned on a movement path of the steel sheet and irradiating a laser line to the surface of the steel sheet in a line shape with respect to the width direction of the steel sheet. It relates to a surface treatment apparatus of a steel sheet comprising a.
  • the laser line irradiator may include a plurality of laser heads for irradiating a laser beam at a predetermined length in the width direction of the steel sheet in a width direction of the steel sheet, and the laser line is formed by the laser beam.
  • a plurality of the laser line irradiation unit may be further configured in the longitudinal direction of the steel sheet.
  • width measuring sensor for measuring the width of the steel sheet; And, a controller configured to receive data from the width measuring sensor and to control the laser line to irradiate a laser line corresponding to the width of the steel sheet.
  • Surface treatment apparatus for a steel sheet may further include a control unit for controlling at least one of the laser line irradiator and the moving unit in order to vary the surface treatment conditions of the steel sheet.
  • the controller may vary at least one of an output density of a laser line irradiator and a moving speed of the steel sheet to form a crystal grain refinement layer, a hardened layer, or an amorphous layer on the surface of the steel sheet.
  • the controller may control the laser line irradiator to irradiate a laser line at an output density within a range of 10 4 to 10 8 watts / cm 2 .
  • the control unit may control the moving speed of the steel sheet by operating the moving unit to irradiate the steel sheet within a range of 10 ⁇ 8 to 10 0 seconds.
  • the surface treatment apparatus of a steel sheet may further include a cooling unit for cooling the steel sheet by spraying a cooling fluid on the steel sheet surface-treated by the laser line irradiation unit.
  • the laser line irradiator may be disposed on both sides of the steel sheet and irradiate a laser line to at least one surface of the steel sheet being moved.
  • Another aspect of the present invention comprises the steps of preparing a steel sheet to move continuously; And treating the surface of the steel sheet by irradiating a surface of the continuously moving steel sheet with a laser line having a line shape in the width direction of the steel sheet.
  • the laser line is irradiated through a laser line irradiator, and the laser line irradiator is provided with a plurality of laser heads irradiating a laser beam with a predetermined length in the width direction of the steel sheet in the width direction of the steel sheet.
  • the laser line can be formed by.
  • the laser line irradiator may further include a plurality of laser line irradiation units in the longitudinal direction of the steel sheet.
  • the surface treatment may be any one of forming a grain refinement layer, a cured layer, or an amorphous layer.
  • the surface treatment step may be performed so that the laser line is irradiated at an output density within the range of 10 4 ⁇ 10 8 watts / cm 2 , and may be performed so that the laser line is irradiated within the range of 10 -8 ⁇ 10 0 seconds. .
  • a cooling fluid on the surface-treated steel sheet may further comprise the step of cooling the steel sheet.
  • the surface treatment step may be performed to form an amorphous layer having a thickness of 10 ⁇ m at 1.0 nm on the surface of the steel sheet.
  • the surface of the steel sheet is continuously irradiated by irradiating the surface of the steel sheet with a laser line having a line shape with respect to the width direction of the steel sheet so that the surface treatment of the steel sheet can be performed more quickly, thereby reducing the process time.
  • FIG. 1 is a view schematically showing a method of surface treatment of a steel sheet using a conventional laser beam.
  • FIG. 2 is a view schematically showing a surface treatment apparatus of a steel sheet according to an embodiment of the present invention.
  • 3 is a view showing the arrangement of the laser head.
  • FIG. 4 is a view schematically showing an apparatus for treating a surface of a steel sheet according to another embodiment of the present invention.
  • FIG. 5 is a view schematically showing a method of surface treatment of a steel sheet using a laser line.
  • FIG. 6 is a view showing a cross section of a steel sheet on which both surfaces of the steel sheet are surface treated to form a grain refining layer.
  • FIG. 7 is a view showing a step in which the surface treatment apparatus of the present invention is installed in a steel plate production step.
  • the present inventors have a scanning surface treatment method of irradiating a point laser beam to the left and right, ie reciprocating in the width direction of the steel sheet as shown in FIG. It was found that there is a problem that takes a lot of time, and that it is difficult to surface-treat large-area steel sheets.
  • FIG. 2 is a view schematically showing a surface treatment apparatus of a steel sheet according to an embodiment of the present invention.
  • the surface treatment apparatus 100 includes a moving part 110 for moving the steel sheet S and a movement path of the steel sheet, in a width direction of the steel sheet. It includes a laser line irradiation unit 130 for irradiating a laser line (L) to the surface of the steel sheet in a line shape.
  • the moving part 110 is provided with a plurality of rotating rolls, and is disposed above and below the steel sheet S to press and move the steel sheet S.
  • the configuration for moving the steel sheet (S) is not limited thereto, and various known mechanical moving means may be applied.
  • the moving part not only moves the steel sheet, but also serves to hold the shape of the steel sheet in the width direction so that the focal point of the laser line irradiated onto the steel sheet surface is constant.
  • the laser line irradiator 130 is positioned on a movement path of the steel sheet and irradiates a laser line to the surface of the steel sheet in a line shape with respect to the width direction of the steel sheet.
  • the laser line irradiator 130 is provided with a plurality of laser heads (H) for irradiating a laser beam with a predetermined length in the width direction of the steel sheet in the width direction of the steel sheet, as shown in 131 of FIG.
  • the laser line may be formed by a beam.
  • the laser line can be irradiated onto the surface of the steel sheet in a line shape corresponding to the width of the steel sheet.
  • the laser line by the laser line irradiator may be made smaller than the width of the steel sheet, and a plurality of laser line irradiators may be provided in the width direction of the steel sheet.
  • the maintenance and management can be facilitated by providing four laser line irradiating portions capable of irradiating a laser line 300 mm in the width direction of the steel sheet in the width direction of the steel sheet. .
  • the laser line irradiator may be disposed in a plurality of lengths in the longitudinal direction of the steel sheet to irradiate the laser line to a predetermined surface.
  • a width measuring sensor measuring the width of the steel sheet S and data from the width measuring sensor, that is, the steel sheet S
  • the controller may further include a control unit for controlling the laser head of the laser line irradiator 130 to receive the magnitude value of the width and irradiate the laser line corresponding to the width of the steel sheet S.
  • control unit may change at least one of the laser line irradiation unit 130 and the moving unit 110 in order to vary the surface treatment conditions of the steel sheet S. Can be controlled.
  • the controller may vary at least one of an output density of a laser line irradiator and a moving speed of the steel sheet to form a grain refinement layer, a hardened layer, or an amorphous layer on the surface of the steel sheet S. At least one of the laser line irradiator 130 and the moving unit 110 may be controlled.
  • control unit outputs the laser line within the range of 10 4 ⁇ 10 8 watts / cm 2 to form a grain refinement layer, a hardened layer or an amorphous layer on the surface of the steel sheet (S)
  • the laser line irradiator is controlled to irradiate at a density
  • the moving unit is operated to irradiate the steel sheet within a range of 10 ⁇ 8 to 10 0 seconds to control the moving speed of the steel sheet.
  • the output density of the laser line and the time for which the laser line is irradiated to the steel sheet S is set according to the material of the steel sheet S and the surface state of the steel sheet to be obtained.
  • the steel sheet according to an embodiment of the present invention is formed with a coating film coated with a molten metal on the surface, the surface treatment apparatus 100 of the laser line irradiator and the moving portion to vary the surface treatment conditions of the steel sheet
  • a focal length measurement sensor disposed at the laser line irradiator to measure a distance from the steel sheet, and the controller may set an output value of the laser line through Equation 1 below.
  • LP C [W] LP [W] +1.8 (V [mpm] / 50 [mpm]) + 0.5 (T [mm] /0.1 [mm]) + 1.5 (L C [mm] / L [mm])
  • Equation 1 LP C is the output of the laser line, LP is the output of the reference laser line, V is the moving speed of the steel sheet (where mpm is meters / min), T is the thickness of the coating film, L C is the focal length, L is It means the reference focal length.
  • the focal length means a distance between the laser line irradiator and the steel sheet, and the focal length value is changed according to the thickness of the steel sheet.
  • in order to measure the focal length may further include a focal length measuring sensor for measuring the distance between the laser line irradiation unit and the steel sheet.
  • the focal length measuring sensor may be disposed in the laser line irradiation unit and various known distance measuring sensors such as an optical sensor measuring a distance from the steel sheet.
  • the output of the reference laser line and the reference focal length are preferably set through experiments to an optimum value for forming an alloy layer, a grain refinement layer, or an amorphous layer in a state where a specific molten metal is coated on a steel plate having a predetermined thickness. . Therefore, for steel sheets coated with the same molten metal, when the thickness of the steel sheet, the moving speed of the steel sheet, and the thickness of the coating film are changed, the value of the laser line may be set by substituting the value into Equation 1 above.
  • the surface treatment apparatus 100 may be surface treated by the laser line irradiator 130. It may further include a cooling unit for cooling the steel sheet by injecting a cooling fluid to the steel sheet (S).
  • FIG. 4 is a view schematically showing an apparatus for treating a surface of a steel sheet according to another embodiment of the present invention.
  • the surface treatment apparatus 200 of the steel sheet according to another embodiment of the present invention is provided in the same configuration as the surface treatment apparatus 100 according to an embodiment of the present invention shown in Figure 2, the laser line
  • the irradiation unit 230 is configured to irradiate a laser line to at least one side of the steel sheet S which is disposed on both sides of the steel sheet S and is moved.
  • the laser line irradiator 230 is provided in pairs and is disposed on both sides of the steel sheet S, so that the surface treatment is required on both surfaces of the steel sheet S.
  • the laser line (L) By operating the laser line (L) on both surfaces of the steel sheet (S) can be surface-treated.
  • only one surface of the steel sheet S may be surface-treated by operating only one of the pair of laser line irradiation units 230.
  • a pair of cooling units 240 for injecting cooling fluid C may also be provided, and may be provided to cool both surfaces of the steel sheets S, which are disposed on both sides of the steel sheets S, and are surface treated. have.
  • the steel sheet can be quickly surface-treated by irradiating a laser line having a length corresponding to the width of the steel sheet, and rapid heating and rapid cooling can be performed by successively arranging the laser line irradiating portion and the cooling portion, so that the grain refinement layer
  • the desired surface treatment characteristic can be provided to a steel plate like a hardened layer or an amorphous layer.
  • the surface treatment apparatus of the present invention is capable of surface treatment for a continuously moving steel sheet, it is possible to provide a surface treatment apparatus of the present invention in the continuous steel sheet production process, the surface treatment during the continuous steel sheet production process.
  • the surface treatment apparatus of the present invention before the rolling mill SPM as shown in Fig. 7, the surface treatment can be performed before rolling.
  • Another aspect of the present invention is a method for surface treatment of a steel sheet comprising the steps of continuously preparing a steel sheet; And treating the surface of the steel sheet by irradiating the surface of the continuously moving steel sheet with a laser line having a line shape with respect to the width direction of the steel sheet.
  • the laser line is irradiated through the laser line irradiator as described in the description of the surface treatment apparatus, and the laser line irradiator is a laser head for irradiating a laser beam with a predetermined length in the width direction of the steel sheet in the width direction of the steel sheet.
  • a plurality may be provided and the laser line may be formed by the laser beam.
  • the laser line irradiator may further include a plurality of laser line irradiation units in the longitudinal direction of the steel sheet.
  • the surface treatment may be any one of forming a grain refinement layer, a cured layer, or an amorphous layer.
  • FIG. 5 is a view schematically showing a method of surface treatment of a steel sheet using a laser line. As shown in FIG. 5, while the steel sheet S passes through the laser line, the amorphous layer A may be continuously applied to the surface of the steel sheet. When forming an amorphous layer, corrosion resistance and abrasion resistance can be continuously provided to a steel plate surface.
  • the crystal grain refinement layer R may be formed on both surfaces of the steel sheet S according to one embodiment of the present invention.
  • the grain refining layer the effect of improving the wear resistance and corrosion resistance of the steel sheet can be obtained.
  • the surface treatment step may be performed so that the laser line is irradiated at an output density within the range of 10 4 ⁇ 10 8 watts / cm 2 , and may be performed so that the laser line is irradiated within the range of 10 -8 ⁇ 10 0 seconds. .
  • the power density of the laser line is less than 10 4 watts / cm 2 or the irradiation time is less than 10 ⁇ 8 , it is difficult to form a grain refining layer, a hardening layer or an amorphous layer because the energy transferred is too small.
  • the power density is greater than 10 8 watts / cm 2 or the irradiation time is greater than 10 0 , the surface irradiated with the laser line may melt or form a hole.
  • the steel sheet according to an embodiment of the present invention is formed with a coating film coated with molten metal on the surface
  • the surface treatment step may be performed by setting the output value of the laser line through the following formula (1).
  • LP C [W] LP [W] +1.8 (V [mpm] / 50 [mpm]) + 0.5 (T [mm] /0.1 [mm]) + 1.5 (L C [mm] / L [mm])
  • Equation 1 LP C is the output of the laser line, LP is the output of the reference laser line, V is the moving speed of the steel sheet (where mpm is meters / min), T is the thickness of the coating film, L C is the focal length, L is It means the reference focal length.
  • the focal length means a distance between the laser line irradiator and the steel sheet, and the focal length value is changed according to the thickness of the steel sheet.
  • the output of the reference laser line and the reference focal length are preferably set through experiments to an optimum value for forming an alloy layer, a grain refinement layer, or an amorphous layer in a state where a specific molten metal is coated on a steel plate having a predetermined thickness. . Therefore, for steel sheets coated with the same molten metal, when the thickness of the steel sheet, the moving speed of the steel sheet, and the thickness of the coating film are changed, the value of the laser line may be set by substituting the value into Equation 1 above.
  • a cooling fluid on the surface-treated steel sheet may further comprise the step of cooling the steel sheet.
  • the surface treatment step may be performed to form an amorphous layer having a thickness of 10 ⁇ m at 1.0 nm on the surface of the steel sheet. If the amorphous layer is less than 1.0 nm, sufficient corrosion resistance and wear resistance cannot be obtained.
  • the surface treatment step may be performed during the continuous steel sheet production process.
  • the surface treatment may be performed before passing through the rolling mill (SPM) during the continuous steel sheet production process as shown in FIG.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Optics & Photonics (AREA)
  • Plasma & Fusion (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
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  • Laser Beam Processing (AREA)

Abstract

La présente invention concerne : un dispositif de traitement de surface de tôle d'acier qui comprend une unité de transport, pour le transport d'une tôle d'acier, et une unité d'exposition à une raie laser disposée sur le trajet de transport de la tôle d'acier et exposant la surface de la tôle d'acier à une raie laser sous la forme d'une raie dans le sens de la largeur de la tôle d'acier; un procédé de traitement de surface de tôle d'acier qui comprend les étapes consistant, à l'aide du dispositif de traitement de surface de tôle d'acier, à préparer une tôle d'acier, à la transporter consécutivement et à traiter la surface de la tôle d'acier par exposition de la surface de la tôle d'acier, transportée consécutivement, à une raie laser sous la forme d'une raie dans le sens de la largeur de la tôle d'acier.
PCT/KR2016/014905 2015-12-24 2016-12-19 Dispositif de traitement de surface de tôle d'acier et procédé de traitement de surface WO2017111417A1 (fr)

Applications Claiming Priority (2)

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KR1020150185784A KR20170076847A (ko) 2015-12-24 2015-12-24 강판의 표면처리 장치 및 표면처리 방법
KR10-2015-0185784 2015-12-24

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WO2017111417A1 true WO2017111417A1 (fr) 2017-06-29

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6089532A (ja) * 1983-10-19 1985-05-20 Keizo Nagano 板材のアモルフアス化表面処理方法
KR19990077250A (ko) * 1996-01-15 1999-10-25 앤 제이. 로버슨 레이저 가공에 의한 표면 처리의 개선
KR20040056315A (ko) * 2002-12-23 2004-06-30 주식회사 포스코 강판의 에지부 트래킹을 통한 두께 및 폭측정장치
JP2009097028A (ja) * 2007-10-15 2009-05-07 Rezakku:Kk 金属材料の結晶粒制御方法
KR20130127102A (ko) * 2012-05-14 2013-11-22 주식회사 이엔씨 테크놀로지 다중 라인레이저 어닐링장치

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6089532A (ja) * 1983-10-19 1985-05-20 Keizo Nagano 板材のアモルフアス化表面処理方法
KR19990077250A (ko) * 1996-01-15 1999-10-25 앤 제이. 로버슨 레이저 가공에 의한 표면 처리의 개선
KR20040056315A (ko) * 2002-12-23 2004-06-30 주식회사 포스코 강판의 에지부 트래킹을 통한 두께 및 폭측정장치
JP2009097028A (ja) * 2007-10-15 2009-05-07 Rezakku:Kk 金属材料の結晶粒制御方法
KR20130127102A (ko) * 2012-05-14 2013-11-22 주식회사 이엔씨 테크놀로지 다중 라인레이저 어닐링장치

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