EP2834034A1 - Verfahren und system zur farbmarkierung von metallen - Google Patents

Verfahren und system zur farbmarkierung von metallen

Info

Publication number
EP2834034A1
EP2834034A1 EP13724023.0A EP13724023A EP2834034A1 EP 2834034 A1 EP2834034 A1 EP 2834034A1 EP 13724023 A EP13724023 A EP 13724023A EP 2834034 A1 EP2834034 A1 EP 2834034A1
Authority
EP
European Patent Office
Prior art keywords
laser
optics
power
scanner
distance
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP13724023.0A
Other languages
English (en)
French (fr)
Inventor
Arkadiusz Antonczak
Dariusz Kocon
Maciej Nowak
Pawel Koziol
Pawel Kaczmarek
Adam Waz
Krzysztof ABRAMSKI
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Wroclawskie Centrum Badan EIT Sp zoo
Original Assignee
Wroclawskie Centrum Badan EIT Sp zoo
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 Wroclawskie Centrum Badan EIT Sp zoo filed Critical Wroclawskie Centrum Badan EIT Sp zoo
Publication of EP2834034A1 publication Critical patent/EP2834034A1/de
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
    • B23K26/04—Automatically aligning, aiming or focusing the laser beam, e.g. using the back-scattered light
    • B23K26/046—Automatically focusing the laser beam
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/0006—Working by laser beam, e.g. welding, cutting or boring taking account of the properties of the material involved
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/08—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
    • 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
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/24—Ablative recording, e.g. by burning marks; Spark recording
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
    • B41M5/262—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used recording or marking of inorganic surfaces or materials, e.g. glass, metal, or ceramics
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B44—DECORATIVE ARTS
    • B44C—PRODUCING DECORATIVE EFFECTS; MOSAICS; TARSIA WORK; PAPERHANGING
    • B44C1/00—Processes, not specifically provided for elsewhere, for producing decorative surface effects
    • B44C1/22—Removing surface-material, e.g. by engraving, by etching
    • B44C1/228—Removing surface-material, e.g. by engraving, by etching by laser radiation
    • 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
    • B23K2103/50—Inorganic material, e.g. metals, not provided for in B23K2103/02 – B23K2103/26

Definitions

  • the present invention relates to a method and a system for color marking of metals.
  • the present invention is used among others for marking metals in the advertising industry, the home appliance industry, the consumer electronics industry, the automotive industry, the jewellery industry and the art.
  • Color laser marking of the metals consists in the formation of thin layers (several tens of nm) of transparent or partially transparent oxides on the metal surface.
  • a white light illuminating the surface of the sample is reflected from both the surface of the oxide and the boundary surface of the oxide and metal area.
  • a suitable thickness of the oxide causes - through the interference of the two reflected beams - the formation of the color effect, wherein the color type follows directly from the refractive index of the layer and its thickness.
  • An international patent application No. WO2010034891A1 describes a method involving the formation of color marking in two stages.
  • a thick layer of oxide (red) is prepared on the surface of the material, and then in a second stage the obtained layer is thinned so as to obtain a specific color.
  • the authors of that invention claim that obtaining a specific, repeatable color in a straight way, i.e. directly in one step, is impossible.
  • U.S. patent US5703709 describes a method that uses two systems of optical scanners and liquid crystal mask. The application does not indicate the need to control the distance to the marked material, but it presents the possibility of co-operation of the system with an automatic feeder.
  • U.S. patent US6613161 describes a method for color marking consisting in formation of transparent or partly transparent oxides with a specified thickness on the metal surface by suitably chosen laser wavelength and pulse energy.
  • the invention is focused on the use of a catalyst such as e.g. oxygen to shorten the time of marking, and indicates the possibility of marking a number of different metals and the use of different lasers (mostly UV - excimer leasers and solid state lasers with harmonic lasers) .
  • a catalyst such as e.g. oxygen to shorten the time of marking
  • different lasers mostly UV - excimer leasers and solid state lasers with harmonic lasers
  • the first object of the invention is a system for color marking of metals by laser comprising a laser for generating a laser beam, which is directed by an electronically controlled element correcting a divergence of the beam, followed by galvo mirrors of the scanner changing the angle of the beam or shifting the beam in a plotter system and then through the optics onto the marked surface area at a predetermined distance from the optics, which is characterized in that it comprises a control unit for reading a signal proportional to the power read by a head of a power meter, into which preferably a part of the laser beam is directed from an uncoupling mirror, which is positioned in the path of the laser beam between the galvo mirrors of the scanner and the surface, preferably in front of or behind the optics, and for reading the signal proportional to the distance from the distance sensor, and for sending the signals controlling a deflection of the beam in the galvo mirrors of the scanner and its divergence, and for sending the laser power control signal, wherein the unit is controlled by means of a control device,
  • Another object of the present invention is a method for color marking of the metals by laser comprising a generation of the laser beam that is directed through the electronically controlled element correcting the divergence of the beam, and through the element changing the angle of the beam or shifting the beam, preferably in the galvo or the plotter system, onto the marked surface by the optics, characterized in that it comprises
  • the method according to the present invention is characterized in that in the step a) the reading of the distance of the optics from the surface is performed using the distance sensor. More preferably, the method according to the present invention is characterized in that in the step b) the reading of the laser beam power is performed using the head of the power meter or the pulse energy, which the beam from the uncoupling mirror is directed into, preferably the mirror positioned between the elements changing the angle or the position of the beam, and the optics.
  • the method is characterized in that the control unit is controlled by the control computer.
  • the method according to the present invention is characterized in that the element changing the angle of the beam or shifting the beam is the galvo scanner or the plotter with the mirrors .
  • the present invention allows to obtain the reproducible results on the marked objects both when they are placed at the incorrect distance from the lens system, and when the next elements piece to piece are different concerning the dimensions (normally the dimension differences of 0.5 mm - do not allow to obtain the same color) .
  • the present invention allows the effect become independent from the state of burn-in of the laser (in the normal systems over a period of a few to several minutes, the power at the output of the system changes in a small degree), the aging processes (the laser power degradation due to aging of its components), or becoming dirty (becoming dusty) of the path of the beam guide, or the degradation / contamination of the external mirrors (of the scanner or the plotter) .
  • the system automatically adjusts the power (the energies) of the laser beam and its initial divergence so that to obtain at the material surface the fixed value of the laser radiation power density.
  • the present invention allows for a simple modification of previously existing systems for marking of metals with functions of the color marking. The only requirement is to use: a sensor controlling the level of the power or energy at the output of the system, a non-contact proximity sensor with an accuracy of 0.1 mm or better (such as laser triangulation sensors from Lauze DS_ODSL8_V66_C66_500 series), an electronically controlled beam expander (e.g.
  • the presented method and kit of the present invention further does not increase the cost of operation of the system. It may be even lower, because there is no need for precise adjusting of the position (height) of the object relative to the optics (lens) of the system in the case of a short series that has the advantage of reducing the time it takes to prepare the station for marking the next (new) element, even if the marking is to be monochromatic. Exemplary embodiments of the invention are shown in the drawing, in which: Figure 1 and 2 illustrate the systems according to the present invention.
  • the system for color marking of the metals comprises the laser L, the output beam W of which passes through the electronically controlled by the signal 4 the optical system V that is used to change the divergence of the laser beam W, which then falls on the first mirror of the scanner X system changing the angle of this beam or shifting this beam in the X axis, and then falls onto the second mirror of the scanner Y changing the angle of this beam or shifting this beam in the Y axis, and then falls on the uncoupling mirror M, which directs the beam by two paths to the output optics F of the system and the head of the power meter P.
  • the beam after passing the output optics F falls on the marking surface S, the distance of which in relation to the optics F is measured by the non-contact DS sensor.
  • the control unit U receives the signals 1 sent from the distance sensor and 2 from the power meter, on the basis of which, as well as on the basis of the signals 3 and 5 controlling the X and Y mirrors, the control unit U generates the signal controlling the divergence of the beam 4 and the signal controlling the power 6 of the laser L.
  • the operation of the system according to the present invention consists in that the control unit U generates the signal 4 controlling the V that corrects the divergence of the beam W in such a way that, irrespective of the current distance of the marked surface S in relation to the output optics F, the position of the beam focus W is exactly on the marked surface S.
  • control unit U generates the signal controlling the power 6 of the laser L in such a manner that the power value measured by the measuring heads P is consistent with expectations.
  • control signals 3 controlling the mirror X and the signal 5 controlling the mirror Y the coordinates of the spot in the working area is determined and the control unit U generates the signal 4, which corrects the beam divergence W that allows for maintaining a constant power density across the whole area of the marked field S.
  • Example 1 The system as in Example 1 wherein, alternatively, on the basis of the value of the signals 3 controlling the mirror X and the signal 5 controlling the mirror Y, the coordinate of the spot in the working area is determined and the control unit U generates the signal 4, which correcting the value of the power control signal 6 of the laser L allows to maintain a constant power density across the whole area of the marked field S.
  • Example 2 The system as in Example 1, except that the head of the power meter P carries out the measurements without using the uncoupling mirror M in the path of the laser between the galvo mirror of the scanner Y and the surface S.
  • the system is shown in the Figure 2.

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Mechanical Engineering (AREA)
  • Ceramic Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Laser Beam Processing (AREA)
EP13724023.0A 2012-04-05 2013-03-22 Verfahren und system zur farbmarkierung von metallen Withdrawn EP2834034A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
PL398735A PL222531B1 (pl) 2012-04-05 2012-04-05 Sposób i system do kolorowego znakowania metali
PCT/PL2013/050009 WO2013151451A1 (en) 2012-04-05 2013-03-22 A method and a system for color marking of metals

Publications (1)

Publication Number Publication Date
EP2834034A1 true EP2834034A1 (de) 2015-02-11

Family

ID=49300822

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13724023.0A Withdrawn EP2834034A1 (de) 2012-04-05 2013-03-22 Verfahren und system zur farbmarkierung von metallen

Country Status (3)

Country Link
EP (1) EP2834034A1 (de)
PL (1) PL222531B1 (de)
WO (1) WO2013151451A1 (de)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2520945A (en) * 2013-12-03 2015-06-10 Spi Lasers Uk Ltd Method for laser marking an anodized metal surface with a desired colour
CN104014935B (zh) * 2014-05-30 2017-01-04 宁波镭基光电技术有限公司 激光器单变量彩色打标系统及方法
TWI592241B (zh) * 2015-02-09 2017-07-21 xin-ru Huang Method of constant laser beam terminal energy and processing system thereof
US11033985B2 (en) 2015-06-24 2021-06-15 University Of Dundee Method of, and apparatus for, reducing photoelectron yield and/or secondary electron yield
GB201603991D0 (en) 2016-03-08 2016-04-20 Univ Dundee Processing method and apparatus
CN106903438A (zh) * 2015-12-22 2017-06-30 武汉奇致激光技术股份有限公司 激光蚀刻机的光路设计控制系统及控制方法
CN108662986A (zh) * 2018-03-07 2018-10-16 温州医科大学 一种自由曲面在线实时检测方法及装置
CN108526698B (zh) * 2018-03-30 2019-06-21 嵊州市慧洁日用品有限公司 一种打印机或复印机设备
CN110238396A (zh) * 2019-06-28 2019-09-17 北京航天控制仪器研究所 一种金属材料彩色成型装置及方法

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JP3279789B2 (ja) 1993-12-10 2002-04-30 株式会社小松製作所 着色レーザマーキング装置
SG83780A1 (en) 2000-03-07 2001-10-16 Gintic Inst Of Mfg Technology Process for laser marking metal surfaces
US6821305B2 (en) 2003-04-01 2004-11-23 Jas. D. Easton, Inc. Process of producing a colored area of desired depth in an anodized layer of metal article
US7284396B2 (en) * 2005-03-01 2007-10-23 International Gemstone Registry Inc. Method and system for laser marking in the volume of gemstones such as diamonds
FI20085916L (fi) 2008-09-29 2010-03-30 Valtion Teknillinen Menetelmä värikuvan valmistamiseksi
WO2011017570A2 (en) * 2009-08-06 2011-02-10 Applied Materials, Inc. In-line metrology methods and systems for solar cell fabrication

Non-Patent Citations (1)

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Also Published As

Publication number Publication date
PL398735A1 (pl) 2013-10-14
WO2013151451A1 (en) 2013-10-10
PL222531B1 (pl) 2016-08-31

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Inventor name: NOWAK, MACIEJ

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Inventor name: KOZIOL, PAWEL

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