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WO2019054964A2 - Système de découpe au laser et procédé pour la focalisation sur un matériau traité dans des machines de découpe au laser - Google Patents

Système de découpe au laser et procédé pour la focalisation sur un matériau traité dans des machines de découpe au laser Download PDF

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Publication number
WO2019054964A2
WO2019054964A2 PCT/TR2017/050681 TR2017050681W WO2019054964A2 WO 2019054964 A2 WO2019054964 A2 WO 2019054964A2 TR 2017050681 W TR2017050681 W TR 2017050681W WO 2019054964 A2 WO2019054964 A2 WO 2019054964A2
Authority
WO
WIPO (PCT)
Prior art keywords
laser cutting
lens
collimating lens
focusing lens
laser
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.)
Ceased
Application number
PCT/TR2017/050681
Other languages
English (en)
Other versions
WO2019054964A3 (fr
Inventor
Mustafa Isik
Nizam MUZAFFEROGLU
Omer OZ
Ilhan KAHRAMAN
Erdal OZTURK
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.)
Ermaksan Makina Sanayi Ve Ticaret AS
Original Assignee
Ermaksan Makina Sanayi Ve Ticaret AS
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 Ermaksan Makina Sanayi Ve Ticaret AS filed Critical Ermaksan Makina Sanayi Ve Ticaret AS
Priority to EP17921432.5A priority Critical patent/EP3558580A2/fr
Publication of WO2019054964A2 publication Critical patent/WO2019054964A2/fr
Anticipated expiration legal-status Critical
Publication of WO2019054964A3 publication Critical patent/WO2019054964A3/fr
Ceased 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
    • B23K26/36—Removing material
    • B23K26/38—Removing material by boring or cutting
    • 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
    • B23K26/14—Working by laser beam, e.g. welding, cutting or boring using a fluid stream, e.g. a jet of gas, in conjunction with the laser beam; Nozzles therefor
    • B23K26/1462—Nozzles; Features related to nozzles
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
    • G02B7/028—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with means for compensating for changes in temperature or for controlling the temperature; thermal stabilisation
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/28—Systems for automatic generation of focusing signals
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/30—Collimators

Definitions

  • the Related Art is related to a laser cutting system and method comprising an adaptive focus control unit associated with cutting heads, which are used at laser cutting machines.
  • the invention particularly is related to laser cutting system and method which was developed to eliminate the focus position shifting problem as the cutting laser is focusing on the working area via lenses at laser cutting machines.
  • Contamination on optics is usually caused by sludge splashing from working area, dirt, dust and other visible and invisible particles as well as smoke that occurs during the process or due to the ambience.
  • the optics that is used in optical cutting heads may be contaminated in several ways.
  • temperature value increases due to environmental factors too.
  • Thermal lens effect caused by optics at high temperature is a serious problem. Because thermal lens effect adversely affects the cutting quality.
  • optic cutting heads are used in laser cutting machines. Some of them focuses laser beam onto working area with use of mirrors. On the other hand, some performs focusing with use of lenses. The purpose of using different methods is to improve the quality of cutting parameter caused by thermal effect.
  • the focus position shifting in optic cutting heads caused by thermal effect is known as thermal lens.
  • thermal lens In former embodiments, some methods were used to reduce thermal lens effect with use of passive methods. However, none of these methods managed to eliminate thermal lens effect fully.
  • thermal conductivity coefficients of the materials from which the lenses are made are selected from materials with high ones, in general, thermal conductivity of glass materials is not of the value capable to remove fully the heat on the lenses.
  • optic cutting head has moving mechanism conducting focus position setting, applying directly water cooling method to the body where lenses are placed causes complication of optic cutting head structure and difficulty in production, which will be another adverse effect.
  • One of the methods applied to minimize thermal lens effect is an active control system disclosed under patent application numbered EP1600241 B1 .
  • the splashing rate thereon increases some folds of normal value.
  • the photo detector is placed onto optic cutting head and thermal lens effect is actively controlled.
  • optic cutting head consists of more than one optics, it is difficult to distinguish whether it is the lenses or protective glasses getting contaminated.
  • Photo detector will read the same value after the splashing in the ambience due to contamination of the optics exceeds threshold value. It is considerably difficult to apply this method for each optic. Because in such case, the optics are to be put in separate compartments. Mobility of some optics make the situation much difficult.
  • This proposed method fails to fully eliminate the thermal lens effect because the contaminated optics cannot be distinguished in the system consisting of multiple optic.
  • This present invention is related to a laser cutting system and method developed to eliminate disadvantages which are mentioned above, and provide new advantages in the related art.
  • Main purpose of the laser cutting system and method subject of the invention is to actively control and eliminate "thermal lens” effect.
  • temperatures of all optics beam collimating lens, focus lens and protective glass
  • temperature sensors are measured by temperature sensors and moved as per position value according to temperature of each lens by predefined control software.
  • focus position value is moved to previous place and controlled actively.
  • thermal lens effect is reset continuously by being kept under control.
  • Another purpose of the invention is to provide accurate reading of temperature of lens by using single lens and to reduce the difference between mechanical axis and optical axis seen in double lens embodiments.
  • Another purpose of the invention is to place the lower protective glass in upper position as the lens lower surface is far to working area in single lens using design when compared to multi-lens using designs, and thus to provide less contamination as it remains far from working area.
  • thermal stress effect is experienced on the lens since expansion coefficients and absorption values are different. Such problem will not be experienced in single lens method.
  • Another purpose of the invention is to determine the lens heating up, by measuring the temperatures at lenses via temperature sensors and to take action without damaging the lens. Thus actions may be taken before the lens is over heated and may be re-used by cleaning.
  • Another purpose of the invention is to adjust the focus position with collimating lens and be less affected by particles such as dirt, sludge splashing from working ambience. Having movement mechanism on the lens in the top (collimating lens) facilitates mechanical accessories of the focusing lens in the lower part, and enables lifting lower protective glass upper and thus provides less contamination.
  • a further purpose of the invention is to move lens less by adjusting focus position via collimating lens and thus adjust focus position. This enables design of mechanical body in a more compact structure.
  • the invention relates to a laser cutting system comprising a laser cutting head that focuses the laser beam onto processed material in laser cutting machines, which comprises following features;
  • At least one collimating lens collimating the laser beams emitted from laser beam source, and transmitting at a given diameter and, ⁇ at least one focusing lens that is used to focus the laser beams to working area, is located.
  • the invention is characterized in that in order to solve the problem of focus point shifting while focusing the laser beams onto working area, it comprises an adaptive focus control unit comprising; ⁇ temperature sensors that is located in said laser cutting head, measuring the temperature of said collimating lens and/or focusing lens, • sensor reading circuit converting temperature values measured at said temperature sensors, into electrical value,
  • processor receiving temperature values converted into electrical values, from said sensor reading circuit and where control software containing algorithm specifying the locations where the collimating lens and/or focusing lens should be for temperature values of collimating lens and/or focusing lens, is installed,
  • At least one driving unit locating the collimating lens and/or focusing lens to the specified locations while being controlled by said processor.
  • the invention is related to a method achieved by said laser cutting system.
  • the invention is characterized in that, in order to solve the focus point shifting problem which occurs during focusing the laser beams onto working area, comprises following procedure steps;
  • Figure 1 is a representative view of an alternative of the laser cutting system subject of the invention.
  • Figure 2 is a representative view of focusing lens that is used in laser cutting head, when focus shifting occurs and when it does not occur.
  • Figure 3 is a representative view of the quantity of heat that is emitted from the focusing lens that is used in laser cutting head, in clean and contaminated conditions.
  • Figure 4 is a representative view of the quantity of heat that is emitted from protective glass that is used in laser cutting head, in clean and contaminated conditions.
  • Figure 5 is the view showing cutting machines together with the laser cutting system of the invention.
  • Laser cutting machine 20 Laser cutting system
  • FIG. 1 is a representative view of an alternative of the laser cutting system (20) subject of the invention. Accordingly, laser beams that is focused onto the processed material (14) from focus point (13) is transmitted from laser beam source to the laser cutting head (1 ) by cable (2).
  • Said cable (2) is a fibre optic cable.
  • the connector (3) is used.
  • upper protective glass (5) collimating lens (7) focusing lens (8) and lower protective glass (9) are located at certain intervals from top to down. The components located from top to down are on the same optic axis (16).
  • Lower part of the laser cutting head (1 ) where laser beams leave at high pressure has the laser output aperture (12).
  • Said upper protective glass (5) and lower protective glass (9) are held inside said laser cutting head (1 ) by the protective glass holder (4).
  • Said upper protective glass (5) is used to prevent penetration of dust particles that might come from connector (3) gap into internal parts of the cutting head (1 ), while said lower protective glass (9) is used to protect the focusing lens (8) against contamination particles that might come from working area, and ensure that the focusing lens (8) is not affected from high gas pressure.
  • Said collimating lens (7) and focusing lens (8) are mounted to lens holders (6) and located inside the laser cutting head (1 ).
  • the main body (20) is cooled down with water flowing through channels provided on main body (20). Since lens holder (6) and protective glass holder (4) are in contact with the main body (20), the lens holder (6) and protective glass holder (4) assist to discharge the heat (Q) on the optics.
  • Said collimating lens (7) is a collimator lens.
  • Said collimating lens (7) lets the laser beams emitted from fibre optic cable (2) to progress in a certain diameter by collimating.
  • Said focusing lens (8) is used to focus the laser-beam onto the working area.
  • the temperature sensors (10) are located inside laser cutting head (1 ) at certain points. The temperature sensors (10) measure the temperatures at collimating lens (7), focusing lens (8), lower protective glass (9) and upper protective glass (5).
  • At least one driving unit (1 1 ) is connected to the laser cutting head (1 ).
  • Said driving unit (1 1 ) is preferably associated with collimating lens (7), to adjust focus and moves the lens.
  • said adaptive focus control unit (15) comprises a sensor reading circuit (15.1 ), a processor (15.2) and a motor driver (15.3).
  • Said sensor reading circuit (15.1 ) converts temperature value measured at the temperature sensors (10) into electrical value.
  • the control software is installed onto said processor (15.2).
  • the control software has the algorithm specifying the locations where moveable lens (collimating lens (7)) should be as per temperature values of collimating lens (7) and/or focusing lens (8) and/or lower protective glass (9) and/or upper protective glass (5).
  • Said motor driver (15.3) controls the motion of driving unit (1 1 ) upon command received from the processor (15.2).
  • Said processor (15.2) specifies the location where the moveable lens (collimating lens (7)) should be according to the related temperature values, with control software installed therein, and provides control over the driving unit (1 1 ).
  • the driving unit (1 1 ) starts working and drives moveable lens and relocates it.
  • the moveable lens is located to the location specified by the control software of the processor (15.2) according to the temperature values measured by the temperature sensors (10), and operate without any focus shifting.
  • thermal lens effect is reset continuously by being kept under control.
  • the deviation of the focus positions at various temperature values, of each optic is calculated by control software installed onto said processor (15.2), and the magnitude and direction of the motion to move the moveable lens in order to bring the focus onto the same point again, is found out.
  • management of the driving unit (1 1 ) is provided by the motor driver (15.3) upon command received from said processor (15.2).

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Mechanical Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • Laser Beam Processing (AREA)

Abstract

L'invention concerne un système de découpe au laser (20) comprenant une tête de découpe au laser (1) focalisant un faisceau laser sur un matériau traité (14) dans des machines de découpage au laser (17), au moins une lentille de collimation (7) réalisant la collimation des faisceaux laser émis par la source de faisceau laser et les transmettant à un diamètre donné, et au moins une lentille de focalisation (8) qui est utilisée pour focaliser les faisceaux laser sur la zone de travail. L'invention est destinée à éliminer le problème de décalage du point focal (13) produit lors de la focalisation des faisceaux laser sur la zone de travail.
PCT/TR2017/050681 2016-12-22 2017-12-20 Système de découpe au laser et procédé pour la focalisation sur un matériau traité dans des machines de découpe au laser Ceased WO2019054964A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP17921432.5A EP3558580A2 (fr) 2016-12-22 2017-12-20 Système de découpe au laser et procédé pour la focalisation sur un matériau traité dans des machines de découpe au laser

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
TR201619285 2016-12-22
TR2016/19285 2016-12-22

Publications (2)

Publication Number Publication Date
WO2019054964A2 true WO2019054964A2 (fr) 2019-03-21
WO2019054964A3 WO2019054964A3 (fr) 2019-06-27

Family

ID=65279610

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/TR2017/050681 Ceased WO2019054964A2 (fr) 2016-12-22 2017-12-20 Système de découpe au laser et procédé pour la focalisation sur un matériau traité dans des machines de découpe au laser

Country Status (2)

Country Link
EP (1) EP3558580A2 (fr)
WO (1) WO2019054964A2 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113134691A (zh) * 2021-05-24 2021-07-20 上海柏楚数控科技有限公司 用于激光切割的污点定位方法、装置以及激光切割系统
CN114289861A (zh) * 2022-02-14 2022-04-08 岗春激光科技（江苏）有限公司 一种激光焦点自动补偿系统
CN115846858A (zh) * 2022-12-05 2023-03-28 苏州钋镭自动化科技有限公司 一种激光切割头的焦点实时温度补偿方法
CN117340458A (zh) * 2023-11-23 2024-01-05 江阴创可激光技术有限公司 一种基于温度检测的后聚焦补偿系统及其方法

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011009594A1 (fr) * 2009-07-20 2011-01-27 Precitec Kg Tête d'usinage au laser et procédé permettant de compenser la variation de position du foyer pour une tête d'usinage au laser
DE102009046485A1 (de) * 2009-11-06 2011-05-12 Robert Bosch Gmbh Verfahren und Vorrichtung zum Laserschweißen
DE202010006047U1 (de) * 2010-04-22 2010-07-22 Trumpf Werkzeugmaschinen Gmbh + Co. Kg Strahlformungseinheit zur Fokussierung eines Laserstrahls
CN205587836U (zh) * 2016-04-27 2016-09-21 深圳欧斯普瑞智能科技有限公司 带准直功能的光纤激光切割头

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113134691A (zh) * 2021-05-24 2021-07-20 上海柏楚数控科技有限公司 用于激光切割的污点定位方法、装置以及激光切割系统
CN114289861A (zh) * 2022-02-14 2022-04-08 岗春激光科技（江苏）有限公司 一种激光焦点自动补偿系统
CN115846858A (zh) * 2022-12-05 2023-03-28 苏州钋镭自动化科技有限公司 一种激光切割头的焦点实时温度补偿方法
CN117340458A (zh) * 2023-11-23 2024-01-05 江阴创可激光技术有限公司 一种基于温度检测的后聚焦补偿系统及其方法
CN117340458B (zh) * 2023-11-23 2024-05-10 江阴创可激光技术有限公司 一种基于温度检测的后聚焦补偿系统及其方法

Also Published As

Publication number Publication date
WO2019054964A3 (fr) 2019-06-27
EP3558580A2 (fr) 2019-10-30

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