JP4731040B2 - Laser welding method - Google Patents
Laser welding method Download PDFInfo
- Publication number
- JP4731040B2 JP4731040B2 JP2001142236A JP2001142236A JP4731040B2 JP 4731040 B2 JP4731040 B2 JP 4731040B2 JP 2001142236 A JP2001142236 A JP 2001142236A JP 2001142236 A JP2001142236 A JP 2001142236A JP 4731040 B2 JP4731040 B2 JP 4731040B2
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- Prior art keywords
- laser
- laser light
- resin member
- resin
- irradiated
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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
- 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
-
- 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
- B29C65/1664—Laser beams characterised by the way of heating the interface making use of several radiators
-
- 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
- B29C65/1664—Laser beams characterised by the way of heating the interface making use of several radiators
- B29C65/1667—Laser beams characterised by the way of heating the interface making use of several radiators at the same time, i.e. simultaneous 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
- 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
- B29C65/1677—Laser beams making use of an absorber or impact modifier
-
- 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
- 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
- B29C66/83—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
-
- 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
- B29C65/1603—Laser beams characterised by the type of electromagnetic radiation
- B29C65/1612—Infrared [IR] radiation, e.g. by infrared lasers
- B29C65/1616—Near infrared radiation [NIR], e.g. by YAG lasers
-
- 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
- B29C65/1603—Laser beams characterised by the type of electromagnetic radiation
- B29C65/1612—Infrared [IR] radiation, e.g. by infrared lasers
- B29C65/1622—Far infrared radiation [FIR], e.g. by FIR lasers
-
- 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
- B29C66/71—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 composition of the plastics material of the parts to be joined
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Optics & Photonics (AREA)
- Health & Medical Sciences (AREA)
- Electromagnetism (AREA)
- Toxicology (AREA)
- Laser Beam Processing (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
Description
【０００１】
【発明の属する技術分野】
本発明はレーザ光を利用して、透過側の樹脂表面に悪影響を与えることなく、短時間で樹脂部材同士を接合するレーザ溶着方法に関する。
【０００２】
【従来の技術】
熱可塑性樹脂のレーザ光照射による溶融を利用して樹脂部材同士の接着を行う方法が、特開昭６２−６２７３４号公報、特開昭６２−７４６３０号公報、特開昭６２−７４６３１号公報または特公平５−４２３３６号公報等に提案されている。
【０００３】
これらの方法は、レーザ光の透過率が高い樹脂部材とレーザ光の吸収率が高い樹脂部材とを重ね合わせ、この重ね合わせ（接合）部分にレーザ光を透過する樹脂部材の側から照射し、レーザ光を吸収する樹脂部材の一部を溶融せしめることで樹脂部材同士を接合するものである。また、前記特公平５−４２３３６号公報では、樹脂部材を加熱する代わりに樹脂部材間に介在せしめた接着剤をレーザ光で加熱することで樹脂部材同士を接合する方法も提案されている。
【０００４】
【発明が解決しようとする課題】
上記各公報の方法によってレーザ溶着を行う場合、生産効率を上げるためにレーザ出力を高くすると、レーザ光透過性樹脂部材の表面に焼けや溶融等の不具合が生じて製品の品質低下を招く。その理由は、レーザ光透過性が高い樹脂であっても僅かにレーザ光を吸収するため、レーザ密度が高いとエネルギー吸収量が増加するためである。
【０００５】
また、通常のレーザ溶着を行う場合においても、レーザ光は、透過性樹脂部材に入射するまでの空中通過時の吸収や拡散、透過性樹脂部材表面での反射、透過性樹脂部材中への吸収や拡散、吸収性樹脂表面での反射等により減衰されるため、部材が厚い場合等には溶着に必要なエネルギーが十分に得られない場合がある。この場合にもレーザ出力を上げざるを得ないため、やはりレーザ光透過性樹脂部材の表面に焼けや溶融等の不具合が生じる。
【０００６】
【課題を解決するための手段】
本発明は、比較的高出力のレーザを照射しても樹脂部材に焼けや溶融等の不具合が生ずることがなく、溶着時間の短縮も可能なレーザ溶着方法を提供することを目的とする。
【０００７】
上記課題を解決するため、本発明レーザ溶着方法は、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、レーザ光透過性樹脂部材を通して接合部にレーザ光を照射し、該接合部を溶融せしめて両樹脂部材を相互に溶着する方法であって、前記レーザ光を、２方向またはそれ以上の多方向から該接合部に集光されるように照射する。
前記２方向またはそれ以上の多方向から照射されるレーザ光は、レーザ光同士が相互に重ならない状態でレーザ光透過性樹脂部材へ入射されることが好ましい。
【０００８】
【発明の実施の形態】
以下に本発明の実施の形態を添付図面に基づいて説明する。図１は本発明のレーザ溶着方法の一例を示す斜視図、図２は断面図である。
図に示すように、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とが重ね合わされ、２方向からのレーザ光３ａおよび３ｂが互いに重ならない状態で、レーザ光透過性樹脂部材１の表面に入射されている。なおレーザ光３ａおよび３ｂは、図示されない凸レンズでそれぞれ接合面４に集光するようにコントロールされている。
【０００９】
本発明方法によれば、レーザ光透過性樹脂部材１へのレーザの入射エネルギー密度は、従来の１箇所からの入射エネルギー（Ｗ）の密度の半分で済む。つまりレーザ光３ａおよび３ｂの入射エネルギーをそれぞれＷ/２に減らしても、接合面４に集光されたときのエネルギー量は、従来の１箇所からの入射の場合と変わらないため良好な溶着を行うことができる。
【００１０】
また観点を変えて、従来の１箇所からの入射と同じ量のレーザ光を２箇所から入射すれば２Ｗのエネルギー量を接合面４に供給することができるため、短時間で溶着を終了することができる。
【００１１】
レーザ光３ａ、３ｂの光源としての限定は特にないが、半導体レーザ、ＹＡＧレーザを光源とした遠近赤外領域、可視光領域等各種波長のものを使用することができる。またレーザ光は複数の光源を使用するか、または単一光源のレーザ光を光ファイバで複数に分岐して使用することができる。
【００１２】
レーザ光透過性樹脂部材１を構成する樹脂としては、使用するレーザ光３ａ、３ｂの波長領域におけるレーザ光吸収率が低いものほど好ましく、ポリエチレンテレフタレート（ＰＥＴ）、ポリブチレンテレフタレート等のポリエステル樹脂、ポリエチレン、ポリプロピレン等のポリオレフィン樹脂、ポリアミド樹脂、塩化ビニル樹脂、フッ素樹脂等から適宜選択することができる。また、上記各種樹脂中に、レーザ光を吸収しないか、または吸収しにくい、例えばガラス繊維、ナイロン繊維等の強化材を添加した繊維強化樹脂も好ましく使用することができる。
【００１３】
一方、レーザ光吸収性樹脂部材２としては、使用するレーザ光３ａ、３ｂの波長領域におけるレーザ光吸収率が高い官能基を有する樹脂を使用することもできるが、溶着時におけるレーザ光透過性樹脂部材１との接着性を考慮すると、できるだけ使用するレーザ光透過性樹脂部材１と同じ組成の樹脂あるいは組成が異なっていても相溶性の高い樹脂を採用することが好ましい。したがって、レーザ光吸収性樹脂部材２としては、上述の各樹脂に、レーザ光３ａ、３ｂの波長領域におけるレーザ光吸収率が高い添加物、たとえばカーボンブラック他の各種着色顔料を配合したものを使用することが好ましい。
【００１４】
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とは十分に位置合わせを行った後になるべく隙間がないように加圧・密着させて固定する。両部材の固定方法としては、ガラス板等のレーザ光透過性材料で両部材を挟む方法、レーザ光透過性の袋状樹脂シートに両部材を入れ、袋内を抜気して固定する方法等がある。
【００１５】
レーザ光３ａ、３ｂのレーザ光照射設備としては、例えばレーザヘッド（図示せず）を配置し、ＮＣ制御により３次元空間で自由に移動させることができることが好ましい。レーザ光３ａ、３ｂは、レーザヘッドの移動により、図の手前側から奥行き方向（紙面垂直方法）に向かって順次レーザ光吸収性樹脂部材２の接合部４を溶融してゆく。
【００１６】
【発明の効果】
以上に説明したように本発明によれば、レーザ光を２方向またはそれ以上の多方向から該接合部に集光されるように照射するため、接合部に集光された際には比較的高出力となるレーザ光を照射しても、それぞれのレーザ光の出力が低いため樹脂部材に焼けや溶融等の不具合が生ずることがない。また、このような不具合が生ずることがないため、接合部には従来よりも強いレーザ光を集光させることができ、その結果、溶着時間を短縮することもできる。
【００１７】
また、本発明方法によれば、樹脂部材同士をレーザ光で迅速に溶着させることができ、樹脂の損傷もないため、例えばインストルメントパネル等の自動車部品、電池ケース等の電気・電子部品を好適に製造できる。
【図面の簡単な説明】
【図１】本発明のレーザ溶着方法の一例を示す斜視図
【図２】本発明のレーザ溶着方法の一例を示す断面図
【符号の説明】
１…レーザ光透過性樹脂部材、２…レーザ光吸収性樹脂部材、３ａ、３ｂ…レーザ光、４…接合面。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a laser welding method that uses laser light to join resin members in a short time without adversely affecting the resin surface on the transmission side.
[0002]
[Prior art]
A method for adhering resin members using melting of thermoplastic resin by laser light irradiation is disclosed in JP-A-62-262734, JP-A-62-74630, JP-A-62-74631 or This is proposed in Japanese Patent Publication No. 5-42336.
[0003]
In these methods, a resin member having a high laser beam transmittance and a resin member having a high laser beam absorption rate are overlapped, and this overlapped (bonded) portion is irradiated from the side of the resin member that transmits the laser beam, The resin members are joined together by melting a part of the resin member that absorbs the laser beam. Japanese Patent Publication No. 5-42336 also proposes a method of joining resin members by heating an adhesive interposed between resin members with laser light instead of heating the resin members.
[0004]
[Problems to be solved by the invention]
When laser welding is performed by the methods described in the above publications, if the laser output is increased in order to increase production efficiency, defects such as burning and melting occur on the surface of the laser light transmitting resin member, leading to a reduction in product quality. The reason is that even a resin with high laser beam transparency absorbs laser beam slightly, so that the amount of energy absorption increases when the laser density is high.
[0005]
Further, even when performing normal laser welding, laser light is absorbed and diffused when passing through the air until it enters the transmissive resin member, reflected on the surface of the transmissive resin member, and absorbed into the transmissive resin member. Since it is attenuated by diffusion, reflection, reflection on the surface of the absorbent resin, or the like, energy necessary for welding may not be sufficiently obtained when the member is thick. In this case as well, the laser output must be increased, so that defects such as burning and melting also occur on the surface of the laser light transmitting resin member.
[0006]
[Means for Solving the Problems]
SUMMARY OF THE INVENTION An object of the present invention is to provide a laser welding method in which defects such as burning and melting do not occur in a resin member even when a relatively high output laser is irradiated, and the welding time can be shortened.
[0007]
In order to solve the above-described problem, the laser welding method of the present invention includes a laser light transmitting resin member and a laser light absorbing resin member that are overlapped, and the joint is irradiated with laser light through the laser light transmitting resin member. In this method, both the resin members are welded to each other by melting the joint portion, and the laser light is irradiated so as to be focused on the joint portion from two or more directions.
The laser beams irradiated from the two or more directions are preferably incident on the laser light transmitting resin member in a state where the laser beams do not overlap each other.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a perspective view showing an example of the laser welding method of the present invention, and FIG. 2 is a sectional view.
As shown in the figure, the laser beam transmitting resin member 1 and the laser beam absorbing resin member 2 are overlapped, and the laser beams 3a and 3b from the two directions do not overlap each other. It is incident on the surface. The laser beams 3a and 3b are controlled so as to be focused on the cemented surface 4 by convex lenses (not shown).
[0009]
According to the method of the present invention, the incident energy density of the laser to the laser light transmissive resin member 1 may be half the density of the incident energy (W) from one conventional location. That is, even if the incident energy of the laser beams 3a and 3b is reduced to W / 2, the amount of energy when focused on the joint surface 4 is not different from the case of incidence from one conventional location, so that good welding is achieved. It can be carried out.
[0010]
Also, from a different point of view, if the same amount of laser light as incident from one conventional location is incident from two locations, an energy amount of 2 W can be supplied to the bonding surface 4, so that the welding is completed in a short time. Can do.
[0011]
Although there is no limitation in particular as a light source of laser beam 3a, 3b, The thing of various wavelengths, such as a near-infrared region and visible region which used the semiconductor laser and the YAG laser as a light source, can be used. In addition, a plurality of light sources can be used for the laser light, or the laser light from a single light source can be branched into a plurality of optical fibers.
[0012]
The resin constituting the laser light transmissive resin member 1 is preferably a resin having a lower laser light absorption rate in the wavelength region of the laser light 3a, 3b to be used. Polyester resins such as polyethylene terephthalate (PET) and polybutylene terephthalate, polyethylene , A polyolefin resin such as polypropylene, a polyamide resin, a vinyl chloride resin, a fluororesin, and the like can be appropriately selected. In addition, a fiber reinforced resin in which a reinforcing material such as glass fiber or nylon fiber, for example, which does not absorb or hardly absorb laser light, is preferably used.
[0013]
On the other hand, as the laser light absorbing resin member 2, a resin having a functional group having a high laser light absorption rate in the wavelength region of the laser light 3a, 3b to be used can be used. Considering the adhesiveness with the member 1, it is preferable to employ a highly compatible resin even if the resin having the same composition as the laser light transmitting resin member 1 to be used or the composition is different. Therefore, as the laser light-absorbing resin member 2, the above-mentioned resins are blended with additives having a high laser light absorption rate in the wavelength region of the laser light 3a, 3b, such as carbon black and other various color pigments. It is preferable to do.
[0014]
The laser light transmissive resin member 1 and the laser light absorptive resin member 2 are fixed by pressing and adhering so that there is as little gap as possible after sufficient alignment. As a fixing method of both members, a method of sandwiching both members with a laser light transmitting material such as a glass plate, a method of inserting both members into a laser light transmitting bag-like resin sheet, and evacuating and fixing the inside of the bag, etc. There is.
[0015]
As a laser beam irradiation facility for the laser beams 3a and 3b, for example, a laser head (not shown) is preferably arranged and can be freely moved in a three-dimensional space by NC control. The laser beams 3a and 3b melt the joint 4 of the laser light absorbing resin member 2 sequentially from the front side of the drawing toward the depth direction (the method perpendicular to the paper surface) by the movement of the laser head.
[0016]
【The invention's effect】
As described above, according to the present invention, the laser beam is irradiated so as to be focused on the joint from two or more directions. Even if the laser beam with high output is irradiated, the output of each laser beam is low, so that the resin member does not suffer from burning or melting. In addition, since such a problem does not occur, a stronger laser beam than that in the past can be focused on the joint, and as a result, the welding time can be shortened.
[0017]
In addition, according to the method of the present invention, resin members can be quickly welded with laser light, and there is no damage to the resin. For example, automotive parts such as instrument panels and electrical / electronic parts such as battery cases are suitable. Can be manufactured.
[Brief description of the drawings]
FIG. 1 is a perspective view illustrating an example of a laser welding method of the present invention. FIG. 2 is a cross-sectional view illustrating an example of a laser welding method of the present invention.
DESCRIPTION OF SYMBOLS 1 ... Laser light transmissive resin member, 2 ... Laser light absorptive resin member, 3a, 3b ... Laser beam, 4 ... Bonding surface.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001142236A JP4731040B2 (en) | 2001-05-11 | 2001-05-11 | Laser welding method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001142236A JP4731040B2 (en) | 2001-05-11 | 2001-05-11 | Laser welding method |
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| JP2002331588A JP2002331588A (en) | 2002-11-19 |
| JP4731040B2 true JP4731040B2 (en) | 2011-07-20 |
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| JP2001142236A Expired - Fee Related JP4731040B2 (en) | 2001-05-11 | 2001-05-11 | Laser welding method |
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| CN110636936A (en) * | 2017-05-17 | 2019-12-31 | 必能信超声公司 | Laser welding using intersecting laser beams |
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| JP5497466B2 (en) * | 2010-02-04 | 2014-05-21 | スタンレー電気株式会社 | Manufacturing method of resin molded products |
| JP5610138B2 (en) * | 2010-06-08 | 2014-10-22 | スタンレー電気株式会社 | Laser welding equipment |
| JP6025629B2 (en) | 2013-03-21 | 2016-11-16 | 本田技研工業株式会社 | Method of welding resin parts |
| HUE052369T2 (en) * | 2014-05-30 | 2021-04-28 | Marelli Automotive Lighting Italy Spa | Method of laser welding of an automotive light |
| US20220063185A1 (en) * | 2018-12-28 | 2022-03-03 | Mitsui Chemicals, Inc. | Manufacturing method for resin molded body and resin molded body |
| CN111571024B (en) * | 2020-06-02 | 2022-04-01 | 包头市威丰稀土电磁材料股份有限公司 | Application of laser scoring machine in dynamic synchronous scoring on stretching flattening annealing unit |
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| JPH0722685A (en) * | 1993-06-21 | 1995-01-24 | Mitsubishi Heavy Ind Ltd | Focus composition method of beam and its focus composition device |
| JPH07214354A (en) * | 1994-02-09 | 1995-08-15 | Toshiba Corp | Method and device for synthesizing laser beam and for laser beam welding |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62142092A (en) * | 1985-12-17 | 1987-06-25 | Honda Motor Co Ltd | Adhering method for member by laser |
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- 2001-05-11 JP JP2001142236A patent/JP4731040B2/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0722685A (en) * | 1993-06-21 | 1995-01-24 | Mitsubishi Heavy Ind Ltd | Focus composition method of beam and its focus composition device |
| JPH07214354A (en) * | 1994-02-09 | 1995-08-15 | Toshiba Corp | Method and device for synthesizing laser beam and for laser beam welding |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110636936A (en) * | 2017-05-17 | 2019-12-31 | 必能信超声公司 | Laser welding using intersecting laser beams |
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| JP2002331588A (en) | 2002-11-19 |
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