JP2005081396A - Laser welding device and method - Google Patents

Laser welding device and method Download PDF

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Publication number
JP2005081396A
JP2005081396A JP2003317205A JP2003317205A JP2005081396A JP 2005081396 A JP2005081396 A JP 2005081396A JP 2003317205 A JP2003317205 A JP 2003317205A JP 2003317205 A JP2003317205 A JP 2003317205A JP 2005081396 A JP2005081396 A JP 2005081396A
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laser
laser light
spherical lens
resin member
laser beam
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Japanese (ja)
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Kazuyoshi Takada
和義 高田
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Nissan Motor Co Ltd
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Nissan Motor Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • B29C66/1122—Single lap to lap joints, i.e. overlap joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/16—Laser beams
    • B29C65/1629—Laser beams characterised by the way of heating the interface
    • B29C65/1635—Laser beams characterised by the way of heating the interface at least passing through one of the parts to be joined, i.e. laser transmission welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/16—Laser beams
    • B29C65/1629—Laser beams characterised by the way of heating the interface
    • B29C65/1654—Laser beams characterised by the way of heating the interface scanning at least one of the parts to be joined
    • B29C65/1658—Laser beams characterised by the way of heating the interface scanning at least one of the parts to be joined scanning once, e.g. contour laser welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/001—Joining in special atmospheres
    • B29C66/0012—Joining in special atmospheres characterised by the type of environment
    • B29C66/0014—Gaseous environments
    • B29C66/00141—Protective gases
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/004—Preventing sticking together, e.g. of some areas of the parts to be joined
    • B29C66/0046—Preventing sticking together, e.g. of some areas of the parts to be joined by the use of a lubricant, e.g. fluid, powder
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/43—Joining a relatively small portion of the surface of said articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/739—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/7392—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic
    • B29C66/73921—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic characterised by the materials of both parts being thermoplastics
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/812—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
    • B29C66/8126—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps characterised by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
    • B29C66/81266—Optical properties, e.g. transparency, reflectivity
    • B29C66/81267—Transparent to electromagnetic radiation, e.g. to visible light
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/816—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the mounting of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8161—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the mounting of the pressing elements, e.g. of the welding jaws or clamps said pressing elements being supported or backed-up by springs or by resilient material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/82—Pressure application arrangements, e.g. transmission or actuating mechanisms for joining tools or clamps
    • B29C66/824—Actuating mechanisms
    • B29C66/8242—Pneumatic or hydraulic drives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/836—Moving relative to and tangentially to the parts to be joined, e.g. transversely to the displacement of the parts to be joined, e.g. using a X-Y table
    • B29C66/8362—Rollers, cylinders or drums moving relative to and tangentially to the parts to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/834—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools moving with the parts to be joined
    • B29C66/8341—Roller, cylinder or drum types; Band or belt types; Ball types
    • B29C66/83441—Ball types

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Electromagnetism (AREA)
  • Fluid Mechanics (AREA)
  • Laser Beam Processing (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a laser welding device that can perform laser welding by sufficiently securing surface pressure in a weld zone. <P>SOLUTION: This laser welding device is equipped with: a laser torch 3 for emitting a laser beam; a spherical lens 4 that converges a laser beam and rolls on the surface 1a of a laser beam transmitting resin member 1; and a pressure cylinder 5 that presses this spherical lens 4 against the laser beam transmitting resin member 1 and a laser beam absorbing resin member 2. Also, in this laser welding device, the spherical lens 4 is installed immediately below the laser beam emission exit port 9 of the laser torch 3. As a result, by making the position for pressing the spherical lens 4 coincide with the position for laser irradiation, the surface pressure is secured for the laser beam transmitting resin member 1 and the laser beam absorbing resin member 2. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、レーザ溶着装置およびレーザ溶着方法に関し、詳細には、溶着させる２つのワークの面圧を確保してレーザ溶着を行うレーザ溶着技術に関する。   The present invention relates to a laser welding apparatus and a laser welding method, and more particularly, to a laser welding technique for performing laser welding while ensuring the surface pressure of two workpieces to be welded.

レーザ光を透過させるレーザ光透過性樹脂部材とレーザ光を透過させないレーザ光吸収性樹脂部材とを重ね合わせ、そのレーザ光吸収性樹脂部材側からレーザ光を照射してこれら両部材の接触箇所を加熱溶融させ、両部材を相互に溶着させるレーザ溶着装置が知られている。   The laser beam transmitting resin member that transmits the laser beam and the laser beam absorbing resin member that does not transmit the laser beam are overlapped, and the laser beam is irradiated from the laser beam absorbing resin member side so that the contact point between these two members is determined. A laser welding apparatus that heats and melts and welds both members to each other is known.

このようなレーザ溶着装置としては、例えば、レーザ光出口よりレーザ光を発射するレーザトーチの側面に、溶着させる両部材の接触箇所を転がり可能な球状の押圧子で押さえ付ける押圧治具を一体的に形成したヘッドユニットを備え、このヘッドユニットを移動させながらレーザ光を照射させて両部材を溶着させる構成とされている（例えば、特許文献１など参照）。   As such a laser welding apparatus, for example, a pressing jig that presses a contact portion of both members to be welded with a spherical presser on the side surface of a laser torch that emits laser light from a laser light exit is integrated. The formed head unit is provided, and a laser beam is irradiated while moving the head unit to weld both members (see, for example, Patent Document 1).

このレーザ溶着装置では、レーザトーチに押圧治具を一体的に設けていることからレーザ光の焦点位置を一定に保つことができる。
特開２００１−１０５５００号公報（第１５頁および第１６頁、第１４図） In this laser welding apparatus, since the pressing jig is integrally provided on the laser torch, the focal position of the laser beam can be kept constant.
JP 2001-105500 A (pages 15 and 16, FIG. 14)

しかしながら、このレーザ溶着装置では、レーザトーチの側面に押圧治具を一体的に形成し、レーザ光出口と押圧子とを横並びの配列としているので、ヘッドユニットが大型すると共に、レーザ光を照射する位置と押圧子で押さえる位置とが離れているため、レーザ光透過性樹脂部材とレーザ光吸収性樹脂部材の面圧を確保することが難しい。また、このレーザ溶着装置では、ヘッドユニットの走査にベクトル（ヘッドユニット走査時に先頭を一定に保つようにするための方向性）を考慮しなければならず、走査の動きが複雑になる（プログラムおよび設備が複雑になる）。   However, in this laser welding apparatus, the pressing jig is integrally formed on the side surface of the laser torch, and the laser beam outlet and the pressing elements are arranged side by side, so that the head unit is large and the position where the laser beam is irradiated Therefore, it is difficult to ensure the surface pressure of the laser light transmitting resin member and the laser light absorbing resin member. Further, in this laser welding apparatus, a vector (direction for keeping the head constant during head unit scanning) must be taken into account for scanning of the head unit, and the scanning motion becomes complicated (program and program). Equipment becomes complicated).

そこで、本発明は、溶着部分における面圧を充分に確保してレーザ溶着が可能なレーザ溶着装置およびレーザ溶着方法を提供することを目的とする。   Therefore, an object of the present invention is to provide a laser welding apparatus and a laser welding method capable of performing laser welding while sufficiently ensuring a surface pressure at a welding portion.

前記した目的を達成するために、本発明に係るレーザ溶着装置は、レーザ光を発射するレーザ光発射手段と、レーザ光を集光させると共にレーザ光を透過させるワークの表面を転動する球体レンズと、この球体レンズをワークに対して押圧する押圧手段とを備える。そして、本発明のレーザ溶着装置では、前記球体レンズを、レーザ光発射手段のレーザ光発射出口の真下に設ける。   In order to achieve the above-described object, a laser welding apparatus according to the present invention includes a laser beam emitting unit that emits a laser beam, and a spherical lens that rolls on the surface of a work that collects the laser beam and transmits the laser beam. And a pressing means for pressing the spherical lens against the workpiece. And in the laser welding apparatus of this invention, the said spherical lens is provided directly under the laser beam emission exit of a laser beam emission means.

本発明に係るレーザ溶着装置によれば、レーザ光発射出口の真下に、このレーザ光発射出口より発射されるレーザ光を接触箇所に集光させると共にレーザ光を透過させるワークの表面を転動する球体レンズを設け、この球体レンズをワークに対して押圧させたので、この球体レンズによって、溶着位置の真上からワークを押さ付けることができ、両ワークの面圧を充分に確保させることができる。   According to the laser welding apparatus according to the present invention, the surface of the work that allows the laser light emitted from the laser light emission outlet to be condensed at the contact location and transmits the laser light is rolled just below the laser light emission outlet. Since a spherical lens is provided and this spherical lens is pressed against the workpiece, the spherical lens can press the workpiece from directly above the welding position, and can sufficiently ensure the surface pressure of both workpieces. .

また、本発明のレーザ溶着装置によれば、レーザ光を集光させると共にワークの表面を転動する球体レンズをレーザ光発射出口の真下に設けたので、ヘッドユニットを小型化することができる。さらに、本発明のレーザ溶着装置によれば、球体レンズでワークを押さえている位置と、レーザ光が照射される位置とが一致するため、ヘッドユニットの走査にベクトル（方向性）が不要となる。   According to the laser welding apparatus of the present invention, since the spherical lens that condenses the laser light and rolls on the surface of the workpiece is provided directly under the laser light emission outlet, the head unit can be reduced in size. Furthermore, according to the laser welding apparatus of the present invention, the position where the workpiece is pressed by the spherical lens and the position where the laser beam is irradiated coincide with each other, and thus no vector (directionality) is required for scanning of the head unit. .

以下、本発明を適用した具体的な実施の形態について図面を参照しながら詳細に説明する。   Hereinafter, specific embodiments to which the present invention is applied will be described in detail with reference to the drawings.

図１は本実施の形態のレーザ溶着装置の全体構成図、図２はレーザ溶着装置の球体レンズ部分の要部拡大図、図３はレーザ光をワークに照射したときのレーザ光照射部分の説明図である。   FIG. 1 is an overall configuration diagram of a laser welding apparatus according to the present embodiment, FIG. 2 is an enlarged view of a main part of a spherical lens portion of the laser welding apparatus, and FIG. 3 is an explanation of a laser light irradiation part when laser light is irradiated onto a workpiece. FIG.

本実施の形態のレーザ溶着装置は、図１に示すように、例えばレーザ光を透過させるレーザ光透過性樹脂部材１とレーザ光を吸収するレーザ光吸収性樹脂部材２といった異なる物性を有した、２つのワークをレーザ光の照射によって溶着させる装置である。このレーザ溶着装置は、レーザトーチなどを有したヘッドユニットと、不活性ガスを供給するガス噴出手段である不活性ガス供給装置とを備えている。   As shown in FIG. 1, the laser welding apparatus of the present embodiment has different physical properties, such as a laser light transmitting resin member 1 that transmits laser light and a laser light absorbing resin member 2 that absorbs laser light. It is an apparatus that welds two workpieces by laser light irradiation. This laser welding apparatus includes a head unit having a laser torch and the like, and an inert gas supply device which is a gas ejection means for supplying an inert gas.

ヘッドユニットは、レーザ光を発射するレーザ光発射手段であるレーザトーチ３と、レーザ光を集光させると共にレーザ光透過性樹脂部材１の表面１ａを転動する球体レンズ４と、この球体レンズ４をこれらレーザ光透過性樹脂部材１及びレーザ光吸収性樹脂部材２に対して押圧させる押圧手段である圧力シリンダー５と、球体レンズ４を回転可能に保持する回転保持手段である回転保持機構部６と、球体レンズ４をワークに対して押圧する押圧力および球体レンズ４に対するワークからの突き上げ力を緩和させる押圧力緩和手段である弾性体としてのバネ７とから構成されている。   The head unit includes a laser torch 3 that is a laser beam emitting unit that emits a laser beam, a spherical lens 4 that condenses the laser beam and rolls on the surface 1 a of the laser light transmitting resin member 1, and the spherical lens 4. A pressure cylinder 5 that is a pressing unit that presses the laser light transmitting resin member 1 and the laser light absorbing resin member 2, and a rotation holding mechanism unit 6 that is a rotation holding unit that rotatably holds the spherical lens 4. The spring 7 as an elastic body is a pressing force relaxation means for relaxing the pressing force that presses the spherical lens 4 against the workpiece and the pushing force from the workpiece against the spherical lens 4.

本実施の形態でレーザ溶着するワークには、レーザ光を透過させるレーザ光透過性樹脂部材１と、レーザ光を吸収するレーザ光吸収性樹脂部材２とが使用される。これらレーザ光透過性樹脂部材１とレーザ光吸収性樹脂部材２は、レーザ光透過性樹脂部材１が上になるように重ねられ、該レーザ光透過性樹脂部材１側からレーザ光が照射されて溶着される。   A laser beam transmitting resin member 1 that transmits laser light and a laser beam absorbing resin member 2 that absorbs laser light are used for a workpiece to be laser welded in the present embodiment. The laser light transmitting resin member 1 and the laser light absorbing resin member 2 are overlapped so that the laser light transmitting resin member 1 is on top, and the laser light is irradiated from the laser light transmitting resin member 1 side. Welded.

レーザトーチ３は、レーザ光Ｈｖを発射するレーザ発射手段である。このレーザトーチ３の下端部には、レーザ光Ｈｖを発射させるレーザ光発射出口９が形成されている。また、このレーザトーチ３の上端部には、後述するバネ７の下端部を支えるバネ受け部１０が形成されている。   The laser torch 3 is a laser emitting unit that emits a laser beam Hv. At the lower end of the laser torch 3, a laser light emission outlet 9 for emitting the laser light Hv is formed. A spring receiving portion 10 that supports a lower end portion of a spring 7 described later is formed at the upper end portion of the laser torch 3.

球体レンズ４は、図２に示すように、レーザ光発射出口９から発射されたレーザ光Ｈｖを透過させると共に、そのレーザ光Ｈｖを所定のスポット径としてレーザ光透過性樹脂部材１とレーザ光吸収性樹脂部材２の接触箇所である溶着部１１に集光させる機能をする。また、この球体レンズ４は、レーザ光透過性樹脂部材１の表面１ａを転動しながら溶着する部分を押さえ付ける機能をする。   As shown in FIG. 2, the spherical lens 4 transmits the laser light Hv emitted from the laser light emission outlet 9, and uses the laser light Hv as a predetermined spot diameter to absorb the laser light transmissive resin member 1 and the laser light. It has a function of condensing light on the welded portion 11 that is a contact location of the conductive resin member 2. In addition, the spherical lens 4 has a function of pressing a portion to be welded while rolling the surface 1a of the laser light transmitting resin member 1.

前記球体レンズ４には、例えば球形状をなす高屈折率の光学レンズが採用される。本実施の形態では、球径５ｍｍ（Φ５）、屈折率１．８であるＳＣＨＯＴＴ ＧＬＡＳ社製のＬａＳＦＮ９（商品名）を球体レンズ４として使用した。このＬａＳＦＮ９からなる球体レンズ４は、通常のレンズと比べて非常に小さく全面が研磨面であり、装置の小型化および軽量化に貢献する。   As the spherical lens 4, for example, a high refractive index optical lens having a spherical shape is adopted. In this embodiment, LaSFN9 (trade name) manufactured by SCHOTT GLAS having a spherical diameter of 5 mm (Φ5) and a refractive index of 1.8 is used as the spherical lens 4. The spherical lens 4 made of LaSFN 9 is much smaller than a normal lens and the entire surface is a polished surface, contributing to the reduction in size and weight of the apparatus.

回転保持機構部６は、図２に示すように、球体レンズ４の表面に接触して当該球体レンズ４を回転自在に保持する複数個のボールベアリング１２と、これらボールベアリング１２を保持するベアリング保持部材１３と、このベアリング保持部材１３を支えるアーム１４とを有している。   As shown in FIG. 2, the rotation holding mechanism unit 6 is in contact with the surface of the spherical lens 4, and a plurality of ball bearings 12 that rotatably hold the spherical lens 4, and bearing holding that holds these ball bearings 12. A member 13 and an arm 14 that supports the bearing holding member 13 are provided.

ボールベアリング１２は、球体レンズ４の表面に回転自在に接触し、レーザ光透過性樹脂部材１の表面１ａ上を転動し得るように前記球体レンズ４を回転自在に保持する。このボールベアリング１２を回転自在に保持するベアリング保持部材１３は、少なくとも球体レンズ４の安定した回転を保持させるために、球体レンズ４の球径の略半分以上の部分を覆って形成され、該球体レンズ４の形状に応じた円弧状とされている。このベアリング保持部材１３は、球体レンズ４の安定した回転を保持させるために、少なくとも３つ以上設けられている。そして、このベアリング保持部材１３は、レーザトーチ３の下端部よりワークへと延びるアーム１４の先端に取り付けられている。   The ball bearing 12 rotatably contacts the surface of the spherical lens 4, and rotatably holds the spherical lens 4 so that it can roll on the surface 1a of the laser light transmitting resin member 1. A bearing holding member 13 that rotatably holds the ball bearing 12 is formed so as to cover at least a half or more of the spherical diameter of the spherical lens 4 in order to hold at least stable rotation of the spherical lens 4. An arc shape corresponding to the shape of the lens 4 is used. At least three bearing holding members 13 are provided to hold the spherical lens 4 in a stable rotation. The bearing holding member 13 is attached to the tip of an arm 14 that extends from the lower end of the laser torch 3 to the workpiece.

圧力シリンダー５は、レーザ光透過性樹脂部材１の表面１ａ上を転動する球体レンズ４を、レーザ光透過性樹脂部材１およびレーザ光吸収性樹脂部材２に対して押圧させる機能をする。この圧力シリンダー５は、レーザトーチ３の上部に設けられており、このレーザトーチ３に対して押圧力Ｆを付勢するようになっている。この圧力シリンダー５のシリンダー１４には、レーザトーチ３を内部に可動自在に収容させるレーザトーチ収容ホルダー１５が取り付けられている。   The pressure cylinder 5 functions to press the spherical lens 4 rolling on the surface 1 a of the laser light transmitting resin member 1 against the laser light transmitting resin member 1 and the laser light absorbing resin member 2. The pressure cylinder 5 is provided on an upper portion of the laser torch 3 and biases a pressing force F against the laser torch 3. A laser torch housing holder 15 for movably housing the laser torch 3 is attached to the cylinder 14 of the pressure cylinder 5.

このレーザトーチ収容ホルダー１５には、球体レンズ４をワークに対して押圧する押圧力および球体レンズ４に対するワークからの突き上げ力を緩和させるバネ７が配置されている。このバネ７は、レーザトーチ収容ホルダー１５に形成された収容孔１６の底部とレーザトーチ３との間に配置されている。かかるバネ７は、圧力シリンダー５によって球体レンズ４をワークに対し押圧する押圧力および球体レンズ４に対するワークからの突き上げ力が過剰に作用した場合、それら過剰に作用する球体レンズ４への押圧力などを緩和させて小さなものとし、当該球体レンズ４の破損を防止する。   The laser torch housing holder 15 is provided with a spring 7 that relieves the pressing force that presses the spherical lens 4 against the work and the push-up force of the spherical lens 4 from the work. The spring 7 is disposed between the bottom of the accommodation hole 16 formed in the laser torch accommodation holder 15 and the laser torch 3. Such a spring 7 has a pressing force that presses the spherical lens 4 against the workpiece by the pressure cylinder 5 and a pressing force to the spherical lens 4 that acts excessively when the pushing force from the workpiece against the spherical lens 4 acts excessively. Is reduced to prevent the spherical lens 4 from being damaged.

不活性ガス供給装置８は、不活性ガスを球体レンズ４の表面に吹き付けるガス噴出ノズル１７を有している。このガス噴出ノズル１７は、球体レンズ４に向けられており、そのノズル先端から球体レンズ４に向けて不活性ガスを噴出するようになっている。球体レンズ４の表面に付着したゴミや塵などは、このガス噴出ノズル１７の先端より噴出される不活性ガスによって排除される。なお、不活性ガスは、この種の分野で使用される一般的なガスが使用される。   The inert gas supply device 8 has a gas ejection nozzle 17 that blows an inert gas onto the surface of the spherical lens 4. The gas ejection nozzle 17 is directed to the spherical lens 4, and the inert gas is ejected from the nozzle tip toward the spherical lens 4. Dust and dust adhering to the surface of the spherical lens 4 are removed by the inert gas ejected from the tip of the gas ejection nozzle 17. As the inert gas, a general gas used in this type of field is used.

［レーザ溶着方法］
次に、上述のように構成されたレーザ溶着装置を用いたレーザ溶着方法について説明する。 [Laser welding method]
Next, a laser welding method using the laser welding apparatus configured as described above will be described.

レーザ光吸収性樹脂部材２の上にレーザ光透過性樹脂部材１を重ねた後、このレーザ光透過性樹脂部材１の表面１ａ上に球体レンズ４を載置させる。そして、圧力シリンダー５を作動させ、レーザトーチ３の先端に設けた回転保持機構部６にて保持させた球体レンズ４を、前記レーザ光透過性樹脂部材１の表面１ａに押し付ける。   After the laser light transmitting resin member 1 is overlaid on the laser light absorbing resin member 2, the spherical lens 4 is placed on the surface 1 a of the laser light transmitting resin member 1. Then, the pressure cylinder 5 is operated and the spherical lens 4 held by the rotation holding mechanism 6 provided at the tip of the laser torch 3 is pressed against the surface 1 a of the laser light transmitting resin member 1.

そして、レーザトーチ３のレーザ光発射出口９からレーザ光Ｈｖを発射させる。レーザ光発射出口９から発射されたレーザ光Ｈｖは、図２に示すように、球体レンズ４を透過して集光される。この球体レンズ４にて集光されたレーザ光Ｈｖは、レーザ光透過性樹脂部材１を透過してレーザ光吸収性樹脂部材２の表面に焦点を結ぶ。本実施の形態では、図３に示すように、レーザ光発射出口９から発射されるレーザ光Ｈｖの照射径Ｓ１を直径２．８ｍｍ（Φ２．８）とし、レーザ光吸収性樹脂部材２の表面に焦点を結ぶスポット径Ｓ２を直径０．６ｍｍ（Φ０．６）とした。   Then, the laser light Hv is emitted from the laser light emission outlet 9 of the laser torch 3. The laser light Hv emitted from the laser light emission outlet 9 passes through the spherical lens 4 and is condensed as shown in FIG. The laser beam Hv collected by the spherical lens 4 is transmitted through the laser beam transmitting resin member 1 and focused on the surface of the laser beam absorbing resin member 2. In the present embodiment, as shown in FIG. 3, the irradiation diameter S1 of the laser light Hv emitted from the laser light emission outlet 9 is 2.8 mm (Φ2.8), and the surface of the laser light-absorbing resin member 2 is used. The spot diameter S2 that focuses on is set to 0.6 mm (Φ0.6).

レーザ光吸収性樹脂部材２の表面に焦点を結んだレーザ光Ｈｖにより、そのレーザ光Ｈｖが照射されたレーザ光透過性樹脂部材１とレーザ光吸収性樹脂部材２との接触箇所は、加熱溶融されて溶着される。そして、このレーザ光Ｈｖによる溶着を連続して行うため、ヘッドユニットを図１中矢印Ａで示す方向に移動させる。このとき、球体レンズ４は、回転保持機構部６によって回転自在に保持されていることから、レーザトーチ３の移動に伴ってレーザ光透過性樹脂部材１の表面１ａ上を転動する。   The laser light Hv focused on the surface of the laser light absorbing resin member 2 is heated and melted at the contact point between the laser light transmitting resin member 1 and the laser light absorbing resin member 2 irradiated with the laser light Hv. To be welded. In order to continuously perform the welding with the laser beam Hv, the head unit is moved in the direction indicated by the arrow A in FIG. At this time, since the spherical lens 4 is rotatably held by the rotation holding mechanism 6, the spherical lens 4 rolls on the surface 1 a of the laser light transmitting resin member 1 as the laser torch 3 moves.

また、レーザ光Ｈｖを照射してレーザ溶着するに際しては、不活性ガス供給装置８のガス噴出ノズル１７の先端から不活性ガスを噴出させ、その不活性ガスを球体レンズ４の表面に吹き付ける。球体レンズ４の表面に付着したゴミや塵などは、この不活性ガスによって吹き飛ばされる。   Further, when laser welding is performed by irradiating the laser beam Hv, an inert gas is ejected from the tip of the gas ejection nozzle 17 of the inert gas supply device 8, and the inert gas is sprayed onto the surface of the spherical lens 4. Dust and dust adhering to the surface of the spherical lens 4 are blown away by this inert gas.

［作用効果］
次に、前記したレーザ溶着装置によってレーザ溶着を行った場合の作用効果について説明する。 [Function and effect]
Next, the operation and effect when laser welding is performed by the laser welding apparatus described above will be described.

本実施の形態では、レーザ光発射出口９の真下に設けた球体レンズ４によってレーザ光透過性樹脂部材１を押圧させているので、図３で示す溶着位置ｈ１の真上からレーザ光透過性樹脂部材１を押さえ付けることができる。このため、レーザ光透過性樹脂部材１とレーザ光吸収性樹脂部材２の面圧を充分に確保することができる。従来のレーザ溶着装置では、レーザ光を照射する位置の脇を押圧子で押さえていたため、ワークを押さえる押圧力の効率が悪かった。しかしながら、本実施の形態では、レーザ溶着する箇所の真上を球体レンズ４で押さえ付けることができるため、ワーク押圧力の効率がよい。   In the present embodiment, since the laser light transmitting resin member 1 is pressed by the spherical lens 4 provided immediately below the laser light emitting outlet 9, the laser light transmitting resin is directly above the welding position h1 shown in FIG. The member 1 can be pressed down. For this reason, the surface pressure of the laser light transmitting resin member 1 and the laser light absorbing resin member 2 can be sufficiently secured. In the conventional laser welding apparatus, since the side of the position where the laser beam is irradiated is pressed by the pressing element, the efficiency of the pressing force for pressing the workpiece is poor. However, in this embodiment, since the spherical lens 4 can be pressed right above the place where laser welding is performed, the efficiency of the workpiece pressing force is good.

また、本実施の形態では、球体レンズ４が３６０度方向に回転自在であり、且つ球体レンズ４がレーザ光透過性樹脂部材１を押圧する位置ｈ２とレーザ光Ｈｖが照射される位置ｈ３とを一致させているため、ヘッドユニットの走査にベクトル（方向性）が不要となる。つまり、従来のようにレーザ光を照射する位置と押圧子でワークを押圧する位置とを離した構造であると、ヘッドユニットを移動走査する際に方向性が必要となりその制御が複雑となる。しかしながら、本実施の形態では、方向性は不要となるため、ヘッドユニットを動かす走査プログラムを簡略化することができると共に設備も簡素化できる。   Further, in the present embodiment, the spherical lens 4 is rotatable in the 360 degree direction, and the position h2 where the spherical lens 4 presses the laser light transmitting resin member 1 and the position h3 where the laser light Hv is irradiated are set. Since they match, no vector (directionality) is required for scanning of the head unit. That is, if the structure in which the position where the laser beam is irradiated and the position where the work piece is pressed by the presser is separated as in the prior art, directivity is required when moving and scanning the head unit, and the control becomes complicated. However, in this embodiment, since the directionality is not necessary, the scanning program for moving the head unit can be simplified and the equipment can be simplified.

また、本実施の形態では、レーザトーチ３の真下に球体レンズ４を設けた構成であるので、ヘッドユニットの小型化を実現することができる。また、この実施の形態では、レーザ光発射出口９の真下に球体レンズ４を設けると共に、この球体レンズ４をレーザ光透過性樹脂部材１の表面１ａに接触させているので、レーザ光Ｈｖが空気中を通過する距離が短く、空気中の浮遊物によるレーザ光Ｈｖへの悪影響を抑えることができる。   In the present embodiment, since the spherical lens 4 is provided directly below the laser torch 3, the head unit can be downsized. In this embodiment, the spherical lens 4 is provided directly below the laser light emission outlet 9 and the spherical lens 4 is brought into contact with the surface 1a of the laser light transmitting resin member 1, so that the laser light Hv is air. The distance passing through the inside is short, and adverse effects on the laser beam Hv caused by suspended matter in the air can be suppressed.

また、本実施の形態では、球体レンズ４をボールベアリング１２にて回転自在に保持させているので、当該球体レンズ４をスムーズに回転させることができる。また、本実施の形態では、球体レンズ４にかかる圧力シリンダー５からの押圧力およびレーザ光透過性樹脂部材１の表面凸形状からくる突き上げ力をバネ７によって緩和させているので、球体レンズ４に過剰な荷重がかからなくなる。その結果、本実施の形態のレーザ溶着装置では、球体レンズ４の傷や欠けなどを抑えることができる。   In the present embodiment, since the spherical lens 4 is rotatably held by the ball bearing 12, the spherical lens 4 can be smoothly rotated. In the present embodiment, the pressing force from the pressure cylinder 5 applied to the spherical lens 4 and the push-up force coming from the surface convex shape of the laser light transmitting resin member 1 are alleviated by the spring 7. Excessive load is not applied. As a result, in the laser welding apparatus of the present embodiment, it is possible to suppress scratches and chips on the spherical lens 4.

また、本実施の形態では、球体レンズ４に不活性ガスを吹き付ける不活性ガス供給装置８を備えていることから、球体レンズ４に付着するゴミや塵などを排除することができる。このため、塵埃などを介さずにレーザ光Ｈｖをワークに照射することができ、当該レーザ光Ｈｖの照射が安定する。   Moreover, in this Embodiment, since the inert gas supply apparatus 8 which blows an inert gas to the spherical lens 4 is provided, the dust, dust, etc. which adhere to the spherical lens 4 can be excluded. For this reason, it is possible to irradiate the workpiece with the laser beam Hv without using dust or the like, and the irradiation with the laser beam Hv is stabilized.

以上、本発明を適用した具体的な実施の形態について説明したが、本発明は上述の実施の形態に制限されることなく種々の変更が可能である。   Although specific embodiments to which the present invention is applied have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made.

例えば、押圧力緩和手段には、コイルスプリングなどのバネ７を使用したが、バネ７の代わりに弾性ゴムや空気バネ或いは油圧バネなどを使用することもできる。   For example, although the spring 7 such as a coil spring is used as the pressing force relaxation means, an elastic rubber, an air spring, a hydraulic spring or the like can be used instead of the spring 7.

本実施の形態のレーザ溶着装置の全体構成図である。It is a whole block diagram of the laser welding apparatus of this Embodiment. レーザ溶着装置の球体レンズ部分の要部拡大図である。It is a principal part enlarged view of the spherical lens part of a laser welding apparatus. レーザ光をワークに照射したときのレーザ光照射部分の説明図である。It is explanatory drawing of the laser beam irradiation part when a laser beam is irradiated to a workpiece | work.

符号の説明Explanation of symbols

１…レーザ光透過性樹脂部材（ワーク）
１ａ…レーザ光透過性樹脂部材の表面
２…レーザ光吸収性樹脂部材（ワーク）
３…レーザトーチ（レーザ発射手段）
４…球体レンズ
５…圧力シリンダー（押圧手段）
６…回転保持機構部
７…バネ（押圧力緩和手段）
８…不活性ガス供給装置（ガス噴出手段）
９…レーザ光発射出口
１２…ボールベアリング
１７…ガス噴出ノズル 1 .. Laser light transmitting resin member (work)
DESCRIPTION OF SYMBOLS 1a ... Surface of laser beam transmissive resin member 2 ... Laser beam absorptive resin member (workpiece)
3 ... Laser torch (Laser emission means)
4 ... Spherical lens 5 ... Pressure cylinder (pressing means)
6 ... Rotation holding mechanism 7 ... Spring (pressing force relaxation means)
8 ... Inert gas supply device (gas ejection means)
9 ... Laser beam emission exit 12 ... Ball bearing 17 ... Gas ejection nozzle

Claims (6)

少なくとも２つのワークの接触箇所に、一方のワークを透過させてレーザ光を照射し、該接触箇所を溶融させて両ワークを溶着させるレーザ溶着装置であって、
レーザ光を発射するレーザ光発射手段と、
前記レーザ光発射手段のレーザ光発射出口の真下に設け、このレーザ光発射出口より発射されるレーザ光を前記接触箇所に集光させると共に、レーザ光を透過させる前記ワークの表面を転動する球体レンズと、
前記球体レンズを前記ワークに対して押圧する押圧手段とを備えた
ことを特徴とするレーザ溶着装置。 A laser welding apparatus that transmits one workpiece to a contact location of at least two workpieces and irradiates a laser beam, melts the contact location and welds both workpieces,
Laser light emitting means for emitting laser light;
A sphere that rolls on the surface of the workpiece that is provided directly below the laser light emission outlet of the laser light emission means, condenses the laser light emitted from the laser light emission outlet at the contact location, and transmits the laser light. A lens,
A laser welding apparatus comprising: a pressing unit that presses the spherical lens against the workpiece. 請求項１に記載のレーザ溶着装置であって、
前記球体レンズを回転可能に保持する回転保持手段を備えた
ことを特徴とするレーザ溶着装置。 The laser welding apparatus according to claim 1,
A laser welding apparatus comprising rotation holding means for holding the spherical lens rotatably. 請求項２に記載のレーザ溶着装置であって、
前記回転保持手段は、ボールベアリングである
ことを特徴とするレーザ溶着装置。 The laser welding apparatus according to claim 2,
The rotation holding means is a ball bearing. A laser welding apparatus, wherein: 少なくとも請求項１〜請求項３の何れか一つに記載のレーザ溶着装置であって、
前記球体レンズを前記ワークに対して押圧する押圧力および該球体レンズに対する該ワークからの突き上げ力を緩和させる押圧力緩和手段を備えた
ことを特徴とするレーザ溶着装置。 It is a laser welding apparatus according to any one of claims 1 to 3,
A laser welding apparatus, comprising: a pressing force that presses the spherical lens against the workpiece and a pressing force relaxation means that relaxes a pushing force from the workpiece against the spherical lens. 少なくとも請求項１〜請求項４の何れか一つに記載のレーザ溶着装置であって、
前記球体レンズに不活性ガスを吹き付けるガス噴出手段を備えた
ことを特徴とするレーザ溶着装置。 The laser welding apparatus according to any one of claims 1 to 4, wherein:
A laser welding apparatus comprising gas jetting means for blowing an inert gas onto the spherical lens. レーザ光透過性樹脂部材とレーザ光吸収性樹脂部材とを重ね合わせ、レーザ光発射手段より発射されたレーザ光を、該レーザ光透過性樹脂部材を透過させてこれら両部材を重ね合わせた接触箇所に照射し、該接触箇所を溶融させて両部材を相互に溶着させるレーザ溶着方法であって、
前記レーザ光発射手段のレーザ光発射出口の真下にレーザ光を集光させる球体レンズを設け、この球体レンズを前記レーザ光透過性樹脂部材の表面に押し付けた状態でレーザ光による溶着を行う
ことを特徴とするレーザ溶着方法。
A contact location where a laser beam transmitting resin member and a laser beam absorbing resin member are overlapped, and the laser beam emitted from the laser beam emitting means is transmitted through the laser beam transmitting resin member and the two members are overlapped. Is a laser welding method in which both the members are welded to each other by melting the contact portion,
A spherical lens for condensing the laser light is provided directly below the laser light emitting outlet of the laser light emitting means, and welding is performed with the laser light in a state where the spherical lens is pressed against the surface of the laser light transmitting resin member. A laser welding method characterized.
JP2003317205A 2003-09-09 2003-09-09 Laser welding device and method Pending JP2005081396A (en)

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