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JP4089441B2 - Method of joining thermoplastic resin by laser - Google Patents
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JP4089441B2 - Method of joining thermoplastic resin by laser - Google Patents

Method of joining thermoplastic resin by laser Download PDF

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Publication number
JP4089441B2
JP4089441B2 JP2003010356A JP2003010356A JP4089441B2 JP 4089441 B2 JP4089441 B2 JP 4089441B2 JP 2003010356 A JP2003010356 A JP 2003010356A JP 2003010356 A JP2003010356 A JP 2003010356A JP 4089441 B2 JP4089441 B2 JP 4089441B2
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JP
Japan
Prior art keywords
resin
resins
convex portion
thermoplastic resin
joining
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.)
Expired - Fee Related
Application number
JP2003010356A
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Japanese (ja)
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JP2004223719A (en
Inventor
雅嗣 森口
英一 薮内
隆児 大谷
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.)
Panasonic Electric Works Co Ltd
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Matsushita Electric Works Ltd
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Priority to JP2003010356A priority Critical patent/JP4089441B2/en
Publication of JP2004223719A publication Critical patent/JP2004223719A/en
Application granted granted Critical
Publication of JP4089441B2 publication Critical patent/JP4089441B2/en
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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
    • B29C65/1635—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
    • B29C65/1638—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 focusing the laser beam on the interface
    • 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
    • B29C66/01—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
    • B29C66/12—Joint cross-sections combining only two joint-segments; Tongue and groove joints; Tenon and mortise joints; Stepped joint cross-sections
    • B29C66/124—Tongue and groove 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
    • B29C66/01—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
    • B29C66/12—Joint cross-sections combining only two joint-segments; Tongue and groove joints; Tenon and mortise joints; Stepped joint cross-sections
    • B29C66/126—Tenon and mortise 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
    • B29C66/47—Joining single elements to sheets, plates or other substantially flat surfaces
    • B29C66/472—Joining single elements to sheets, plates or other substantially flat surfaces said single elements being substantially flat
    • 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
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/53—Joining single elements to tubular articles, hollow articles or bars
    • 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
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/53—Joining single elements to tubular articles, hollow articles or bars
    • B29C66/532—Joining single elements to the wall of tubular articles, hollow articles or bars
    • 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
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/61—Joining from or joining on the inside
    • 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
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/832—Reciprocating joining or pressing tools
    • B29C66/8322—Joining or pressing tools reciprocating along one axis
    • 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

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Electromagnetism (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (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、レーザーによる熱可塑性樹脂の接合方法に関するものである。
【０００２】
【従来の技術】
電気かみそり等の製造に使用される従来の振動型リニアアクチュエータは、固定子と、可動子と、この可動子を板ばねを介して往復動自在に支持しているフレームとからなり、上記板ばねには可動子との連結用の結合部材が一体成形されている（例えば、特許文献１参照。）。そして、上記結合部材は可動子側に設けられた凹所に嵌合する凸部として形成されて、この嵌合部で溶着されたり、また上記結合部材には可動子との位置決め用の位置決め部が設けられていると共にこの位置決め部で可動子に溶着されたりしている。
【０００３】
上記結合部材や可動子は通常、熱可塑性樹脂の成形品であり、このような熱可塑性樹脂の接合方法としては、一般的に超音波溶着法（振動溶着法）が使用されていた。
【０００４】
【特許文献１】
特開平１１−２８５２２６号公報（特許請求の範囲等）
【０００５】
【発明が解決しようとする課題】
しかし、超音波溶着法によって熱可塑性樹脂の成形品同士を接合するにあたっては、これらの成形品に高周波振動を与えるために、この振動によって損傷が発生するものであった。このような損傷が接合箇所に発生すると、接合強度が低下するものである。
【０００６】
また、接合箇所に上記のように位置決め部を設けていても、高周波振動によってこの位置決め部が損傷を受け、位置決め部を設けているにもかかわらず位置ずれするという事態が生じ、高精度な位置決めが困難となるおそれがある。別途位置決め用の治工具を使用してもよいが、一般的にこのような治工具は高価なものであって、イニシャルコストがかさむという問題がある。
【０００７】
本発明は上記の点に鑑みてなされたものであり、熱可塑性樹脂同士で高い精度で位置決めすることができて、高価な治工具を使用する必要がなく、イニシャルコストを削減することができると共に、安定した高い強度で接合することができるレーザーによる熱可塑性樹脂の接合方法を提供することを目的とするものである。
【０００８】
【課題を解決するための手段】
本発明の請求項１に係るレーザーによる熱可塑性樹脂の接合方法は、レーザー光Ｌに対して透過特性を有する熱可塑性樹脂１と吸収特性を有する熱可塑性樹脂２とに設けた位置決め構造３によってこれらの熱可塑性樹脂１，２を位置決めすると共に重ね合わせ、透過特性を有する熱可塑性樹脂１の側からこの熱可塑性樹脂１を透過させてレーザー光Ｌを照射して、吸収特性を有する熱可塑性樹脂２を加熱することによって、これらの熱可塑性樹脂１，２を溶着して接合するにあたって、透過樹脂１の内部であって接合箇所となる部分の周囲に金属片１７をあらかじめインサート成形によって埋設しておくことを特徴とするものである。
【０００９】
また請求項２の発明は、請求項１において、位置決め構造３が、凹部４と凸部５との嵌合によるものであることを特徴とするものである。
【００１０】
また請求項３の発明は、請求項２において、凹部４と凸部５との嵌合面６の断面形状が波形状であることを特徴とするものである。
【００１１】
また請求項４の発明は、請求項２又は３において、凸部５の立ち上げ角θを直角より小さい角度とすることによって凸部５に傾斜面７を設けることを特徴とするものである。
【００１２】
また請求項５の発明は、請求項２乃至４のいずれかにおいて、加熱により溶融した樹脂２が溶け込むための溶け込み代８を、凹部４と凸部５の両方又はいずれか一方に設けることを特徴とするものである。
【００１３】
また請求項６の発明は、請求項５において、溶け込み代８の形状がアンダーカット形状であることを特徴とするものである。
【００１４】
【発明の実施の形態】
以下、本発明の実施の形態を説明する。
【００１５】
（実施形態１）
本実施形態において、レーザー光Ｌに対して透過特性を有する熱可塑性樹脂１（以下「透過樹脂１」という。）や、レーザー光Ｌに対して吸収特性を有する熱可塑性樹脂２（以下「吸収樹脂２」という。）としては、特に限定されることなく任意のものを用いることができる。例えば、透過樹脂１としては、ＡＢＳやポリカーボネート等を用いることができ、一方、吸収樹脂２としては、カーボンを顔料として配合したＡＢＳやポリカーボネートを用いることができる。
【００１６】
図１は本実施形態を示すものである。透過樹脂１と吸収樹脂２には位置決め構造３が設けられている。この位置決め構造３は、凹部４と凸部５との嵌合によるものである。すなわち、図１に示すものにおいては、透過樹脂１に凹部４が形成されており、この凹部４に吸収樹脂２を嵌め込むことによって、位置決めすることができるものである。この場合には、吸収樹脂２全体が凸部５として機能しており、このような形態の嵌合も本発明における位置決め構造３に含まれる。ここで、図２に示すように吸収樹脂２の平坦面１８の一部に段差を設けて凸部５を形成してもよく、つまり吸収樹脂２の一部に凸部５を形成してもよく、また、形成する凸部５の個数は凹部４の個数と同数であれば特に限定されるものではなく任意の個数であり、さらに、凹部４と凸部５をいずれの樹脂１，２に形成してもよい。
【００１７】
そして上記のように、凹部４と凸部５との嵌合により位置決めして、透過樹脂１と吸収樹脂２とを重ね合わせる。このとき、図１に示すように、透過樹脂１の重ね合わせ側と反対側の面にレーザー光Ｌを透過する接圧治具９を配置すると共に、吸収樹脂２の重ね合わせ側と反対側の面にも接圧治具１０を配置して、これらの接圧治具９，１０によって両樹脂１，２を挟み込んで押さえ付けるようにしてもよい。
【００１８】
次に、図１の矢印で示すように、透過樹脂１の側にＹＡＧレーザー等のレーザー光Ｌを照射する。レーザー光Ｌは、接圧治具９を透過して透過樹脂１に照射され、さらにこの透過樹脂１を透過した後に吸収樹脂２の表面に照射される。このように吸収樹脂２の表面にレーザー光Ｌが照射されて吸収されると、この部分の吸収樹脂２が発熱して、両樹脂１，２の界面が加熱され、両樹脂１，２の界面を溶着して接合することができるものである。
【００１９】
このように、本実施形態においては両樹脂１，２を接合するにあたって、超音波溶着法（振動溶着法）を使用しないので、両樹脂１，２の接合箇所に高周波振動による損傷が発生せず、安定した高い強度で両樹脂１，２を接合することができるものである。
【００２０】
また、両樹脂１，２には位置決め構造３が設けられているので、この位置決め構造３によって、両樹脂１，２を高い精度で位置決めすることができるものである。この点についてもう少し説明すると、例えば、かりに両樹脂１，２がいずれも平板状に形成されていると、レーザー光Ｌは吸収樹脂２の表面全体に照射され、両樹脂１，２の界面全体が加熱されて溶融状態となる。そうすると、両樹脂１，２は上記の通りいずれも平板状であるために引っ掛かりがなく、相互に位置ずれすることとなるものである。
【００２１】
また、本実施形態においては上記のように、両樹脂１，２に位置決め構造３を設けているので、高価な治工具を別途使用する必要がなくなり、イニシャルコストを削減することができるものである。
【００２２】
（実施形態２）
本実施形態においても、実施形態１と同様の材質である透過樹脂１及び吸収樹脂２を用いることができる。
【００２３】
図３は本実施形態を示すものである。透過樹脂１と吸収樹脂２には位置決め構造３が設けられている。この位置決め構造３も、凹部４と凸部５との嵌合によるものである。すなわち、図３に示すものにおいては、透過樹脂１に凹部４が形成されており、この凹部４に吸収樹脂２を嵌め込むことによって、位置決めすることができるものである。本実施形態においても、吸収樹脂２全体が凸部５として機能しているが、実施形態１と異なる点は、凹部４と凸部５との嵌合面６（レーザー光Ｌが照射される面）の断面形状が波形状である点である。波形状としては、特に限定されるものではないが、例えば、図３に示すようにノコギリ波形状のほか、正弦波形状等を挙げることができる。
【００２４】
そして上記のように、凹部４と凸部５との嵌合により位置決めして、透過樹脂１と吸収樹脂２とを重ね合わせる。このとき、図３に示すように、透過樹脂１の重ね合わせ側と反対側の面にレーザー光Ｌを透過する接圧治具９を配置すると共に、吸収樹脂２の重ね合わせ側と反対側の面にも接圧治具１０を配置して、これらの接圧治具９，１０によって両樹脂１，２を挟み込んで押さえ付けるようにしてもよい。
【００２５】
次に、図３の矢印で示すように、透過樹脂１の側にＹＡＧレーザー等のレーザー光Ｌを照射する。レーザー光Ｌは、接圧治具９を透過して透過樹脂１に照射され、さらにこの透過樹脂１を透過した後に吸収樹脂２の表面に照射される。このように吸収樹脂２の表面にレーザー光Ｌが照射されて吸収されると、この部分の吸収樹脂２が発熱して、両樹脂１，２の界面が加熱され、両樹脂１，２の界面を溶着して接合することができるものである。
【００２６】
このように、本実施形態においても両樹脂１，２を接合するにあたって、超音波溶着法（振動溶着法）を使用しないので、両樹脂１，２の接合箇所に高周波振動による損傷が発生せず、安定した高い強度で両樹脂を接合することができるものである。
【００２７】
また、レーザー光Ｌの照射時において両樹脂１，２の界面は加熱されて溶融状態となるが、両樹脂１，２は単なる平板状に形成されているのではなく、両樹脂１，２には位置決め構造３が設けられているので、両樹脂１，２に設けた凹部４と凸部５との嵌合による位置決め構造３によって、両樹脂１，２を高い精度で位置決めすることができるものである。しかも本実施形態においては、上記の通り凹部４と凸部５との嵌合面６の断面形状が波形状であるので、図１に示す実施形態１の場合よりも、レーザー光Ｌが照射されて吸収される吸収樹脂２の表面の面積が増加しており、この表面積の増加によって接合箇所が増加することとなり、さらに安定した高い強度で両樹脂１，２を接合することができるものである。
【００２８】
また、本実施形態においても上記のように、両樹脂１，２に位置決め構造３を設けているので、高価な治工具を別途使用する必要がなくなり、イニシャルコストを削減することができるものである。
【００２９】
（実施形態３）
本実施形態においても、実施形態１と同様の材質である透過樹脂１及び吸収樹脂２を用いることができる。
【００３０】
図４は本実施形態を示すものである。透過樹脂１と吸収樹脂２には位置決め構造３が設けられている。この位置決め構造３も、凹部４と凸部５との嵌合によるものである。すなわち、図４に示すものにおいては、透過樹脂１に凹部４が形成されており、この凹部４に吸収樹脂２を嵌め込むことによって、位置決めすることができるものである。本実施形態においても、吸収樹脂２全体が凸部５として機能しているが、実施形態１と異なる点は、図４に示すように凸部５の立ち上げ角θを直角（９０°）より小さい角度（０°より大きい角度）とすることによって凸部５に傾斜面７を設けている点である。凸部５の立ち上げ角θが０°又は９０°である場合とは、傾斜面７が存在しない場合を意味するものであり、例えば、図１に示す実施形態１の場合が該当する。なお、凸部５の外面形状と凹部４の内面形状は同一であるので、凸部５に設けた傾斜面７と当接する傾斜面１３が凹部４の内面に設けてある。また、本実施形態において凸部５の先端は平坦面１４としているが、これに限定されるものではない。
【００３１】
そして上記のように、凹部４と凸部５との嵌合により位置決めして、透過樹脂１と吸収樹脂２とを重ね合わせる。このとき、図４に示すように、透過樹脂１の重ね合わせ側と反対側の面にレーザー光Ｌを透過する接圧治具９を配置すると共に、吸収樹脂２の重ね合わせ側と反対側の面にも接圧治具１０を配置して、これらの接圧治具９，１０によって両樹脂１，２を挟み込んで押さえ付けるようにしてもよい。
【００３２】
次に、図４の矢印で示すように、透過樹脂１の側にＹＡＧレーザー等のレーザー光Ｌを照射する。レーザー光Ｌは、接圧治具９を透過して透過樹脂１に照射され、さらにこの透過樹脂１を透過した後に吸収樹脂２の表面に照射される。このように吸収樹脂２の表面にレーザー光Ｌが照射されて吸収されると、この部分の吸収樹脂２が発熱して、両樹脂１，２の界面が加熱され、両樹脂１，２の界面を溶着して接合することができるものである。
【００３３】
このように、本実施形態においても両樹脂１，２を接合するにあたって、超音波溶着法（振動溶着法）を使用しないので、両樹脂１，２の接合箇所に高周波振動による損傷が発生せず、安定した高い強度で両樹脂１，２を接合することができるものである。
【００３４】
また、レーザー光Ｌの照射時において両樹脂１，２の界面は加熱されて溶融状態となるが、両樹脂１，２は単なる平板状に形成されているのではなく、両樹脂１，２には位置決め構造３が設けられているので、両樹脂１，２に設けた凹部４と凸部５との嵌合による位置決め構造３によって、両樹脂１，２を高い精度で位置決めすることができるものである。しかも本実施形態においては、上記の通り凸部５に傾斜面７を設けているので、図１に示す実施形態１の場合よりも、レーザー光Ｌの死角（凸部５の外周側面１２）が減少すると共にレーザー光Ｌが照射されて吸収される吸収樹脂２の表面の面積が増加しており、この表面積の増加によって接合箇所が増加することとなり、さらに安定した高い強度で両樹脂１，２を接合することができるものである。
【００３５】
また、本実施形態においても上記のように、両樹脂１，２に位置決め構造３を設けているので、高価な治工具を別途使用する必要がなくなり、イニシャルコストを削減することができるものである。
【００３６】
（実施形態４）
本実施形態においても、実施形態１と同様の材質である透過樹脂１及び吸収樹脂２を用いることができる。
【００３７】
図５は本実施形態を示すものである。透過樹脂１と吸収樹脂２には位置決め構造３が設けられている。この位置決め構造３も、凹部４と凸部５との嵌合によるものである。すなわち、図５に示すものにおいては、透過樹脂１に凹部４が形成されており、この凹部４に吸収樹脂２を嵌め込むことによって、位置決めすることができるものである。本実施形態においても、吸収樹脂２全体が凸部５として機能しているが、実施形態１と異なる点は、加熱により溶融した樹脂１，２が溶け込む（流れ込む）ための溶け込み代８を設けている点である。この溶け込み代８は、図５に示すように凹部４と凸部５の両方に設けたり、あるいは図６や図７に示すように凹部４と凸部５の一方（図６及び図７においては凹部４のみ）に設けたりすることができる。具体的には、凹部４の内周側面１１と凸部５の外周側面１２との間に隙間（クリアランス）を形成することによって、溶け込み代８を設けることができる。ただし、凹部４の内周側面１１全面と凸部５の外周側面全面１２との間に隙間を形成すると、つまり凹部４に対して凸部５が小さい（凸部５に対して凹部４が大きい）と、位置ずれするおそれがあるので、溶け込み代８を設けるにあたっては、凹部４の内周側面１１全面と凸部５の外周側面１２全面との間に隙間を形成しないようにするものである。すなわち、図５〜図７に示すものおいては、吸収樹脂２の両側に溶け込み代８が存在するので、透過樹脂１に対して吸収樹脂２が位置ずれするようにみえるが（透過樹脂１に形成した凹部４内において、凸部５として機能する吸収樹脂２が左右に移動することができるようにみえるが）、これらの図はあくまでも一断面を示すものであって、他断面においては図１〜図４に示すものと同様に、凹部４の内周側面１１と凸部５の外周側面１２とが当接する箇所が存在しており、この当接によって、両樹脂１，２を高い精度で位置決めすることができるものである。
【００３８】
また、本実施形態においては、溶け込み代８の形状をアンダーカット形状としている。具体的には、図５に示すように、凸部５の外周側面１２の一部に溝部１５を設けることによって、溶け込み代８の形状をアンダーカット形状としている。
【００３９】
そして上記のように、凹部４と凸部５との嵌合により位置決めして、透過樹脂１と吸収樹脂２とを重ね合わせる。このとき、図５に示すように、透過樹脂１の重ね合わせ側と反対側の面にレーザー光Ｌを透過する接圧治具９を配置すると共に、吸収樹脂２の重ね合わせ側と反対側の面にも接圧治具１０を配置して、これらの接圧治具９，１０によって両樹脂１，２を挟み込んで押さえ付けるようにしてもよい。
【００４０】
次に、図５の矢印で示すように、透過樹脂１の側にＹＡＧレーザー等のレーザー光Ｌを照射する。レーザー光Ｌは、接圧治具９を透過して透過樹脂１に照射され、さらにこの透過樹脂１を透過した後に吸収樹脂２の表面に照射される。このように吸収樹脂２の表面にレーザー光Ｌが照射されて吸収されると、この部分の吸収樹脂２が発熱して、両樹脂１，２の界面が加熱され、両樹脂１，２の界面を溶着して接合することができるものである。
【００４１】
このように、本実施形態においても両樹脂１，２を接合するにあたって、超音波溶着法（振動溶着法）を使用しないので、両樹脂１，２の接合箇所に高周波振動による損傷が発生せず、安定した高い強度で両樹脂１，２を接合することができるものである。
【００４２】
また、レーザー光Ｌの照射時において両樹脂１，２の界面は加熱されて溶融状態となるが、両樹脂１，２は単なる平板状に形成されているのではなく、両樹脂１，２には位置決め構造３が設けられているので、両樹脂１，２に設けた凹部４と凸部５との嵌合による位置決め構造３によって、両樹脂１，２を高い精度で位置決めすることができるものである。しかも本実施形態においては、上記の通り溶け込み代８を設けているので、レーザー光Ｌが照射されて発熱した吸収樹脂２が透過樹脂１と共に加熱溶融し、この樹脂１，２が溶け込み代８に溶け込み（流れ込み）、この箇所において冷却固化されることによって、さらに安定した高い強度で両樹脂を接合することができるものである。もう少し説明すると、図５〜図７に示すものにおいて、凸部５の先端の平坦面１４の吸収樹脂２がレーザー光Ｌの照射により発熱して近傍の透過樹脂１と共に加熱溶融され、この樹脂１，２が凸部５の外周側面１２と凹部４の内周側面１１との間に設けた溶け込み代８に回り込むことによって、両樹脂１，２の接合を凸部５の外周側面１２と凹部４の内面側面１１との間においても強固に行うことが可能となり、さらに安定した高い強度で両樹脂１，２を接合することができるものである。
【００４３】
また、本実施形態においては、図５に示すように溶け込み代８の形状がアンダーカット形状であるので、この溶け込み代８に溶け込んで冷却固化された樹脂１，２もアンダーカット形状となり、このアンダーカット形状の樹脂１，２によってアンカー効果も得ることができるものである。従って、溶着による接合のほか、アンカー効果による接合も行うことによって、さらに安定した高い強度で両樹脂１，２を接合することができるものである。
【００４４】
また、本実施形態においても上記のように、両樹脂１，２に位置決め構造３を設けているので、高価な治工具を別途使用する必要がなくなり、イニシャルコストを削減することができるものである。
【００４５】
なお、レーザー光Ｌの照射による溶着後、接圧治具１０から両樹脂１，２を取り外す際に、透過樹脂１と吸収樹脂２との接合面に対して略垂直方向（剥離方向）の力が各樹脂１，２に相互に反対向きに働くと、その力の大きさによっては、両樹脂１，２が剥離するおそれがある。このような事態を想定すると、例えば、図６に示すように、透過樹脂１の重ね合わせ側と反対側の面の周縁にあらかじめリブ１６を設けておくことが好ましい。このようにリブ１６を設けておくと、上記剥離方向の力が透過樹脂１に働いたとき、このリブ１６によって透過樹脂１が変形するのを防止することができ、両樹脂１，２を剥離させないようにすることができるものである。また、本発明では、図７に示すように、透過樹脂１の内部であって接合箇所となる部分の周囲にＳＵＳ４２０等の金属片１７をあらかじめインサート成形によって埋設しておくものである。このように金属片１７が埋設されていると、この金属片１７によって透過樹脂１の剛性が高まって変形しにくくなり、両樹脂１，２を剥離させないようにすることができるものである。
【００４６】
【発明の効果】
上記のように本発明の請求項１に係るレーザーによる熱可塑性樹脂の接合方法は、レーザー光に対して透過特性を有する熱可塑性樹脂と吸収特性を有する熱可塑性樹脂とに設けた位置決め構造によってこれらの熱可塑性樹脂を位置決めすると共に重ね合わせ、透過特性を有する熱可塑性樹脂の側からこの熱可塑性樹脂を透過させてレーザー光を照射して、吸収特性を有する熱可塑性樹脂を加熱することによって、これらの熱可塑性樹脂を溶着して接合するので、超音波溶着法のように両樹脂の接合箇所に高周波振動による損傷が発生せず、安定した高い強度で両樹脂を接合することができるものであり、また、両樹脂に設けた位置決め構造によって、両樹脂を高い精度で位置決めすることができ、高価な治工具を別途使用する必要がなくなり、イニシャルコストを削減することができるものである。
また請求項１の発明は、透過樹脂の内部であって接合箇所となる部分の周囲に金属片をあらかじめインサート成形によって埋設しておくので、この金属片によって透過樹脂の剛性が高まって変形しにくくなり、両樹脂を剥離させないようにすることができるものである。
【００４７】
また請求項２の発明は、位置決め構造が、凹部と凸部との嵌合によるものであるので、超音波溶着法のように両樹脂の接合箇所に高周波振動による損傷が発生せず、安定した高い強度で両樹脂を接合することができるものであり、また、両樹脂に設けた凹部と凸部との嵌合による位置決め構造によって、両樹脂を高い精度で位置決めすることができ、高価な治工具を別途使用する必要がなくなり、イニシャルコストを削減することができるものである。
【００４８】
また請求項３の発明は、凹部と凸部との嵌合面の断面形状が波形状であるので、レーザー光が照射されて吸収される吸収樹脂の表面の面積が増加しており、この表面積の増加によってさらに安定した高い強度で両樹脂を接合することができるものである。
【００４９】
また請求項４の発明は、凸部の立ち上げ角を直角より小さい角度とすることによって凸部に傾斜面を設けるので、レーザー光の死角が減少すると共にレーザー光が照射されて吸収される吸収樹脂の表面の面積が増加しており、この表面積の増加によってさらに安定した高い強度で両樹脂を接合することができるものである。
【００５０】
また請求項５の発明は、加熱により溶融した樹脂が溶け込むための溶け込み代を、凹部と凸部の両方又はいずれか一方に設けるので、レーザー光の照射により加熱溶融した樹脂が溶け込み代にも溶け込み、この箇所において冷却固化されることによって、さらに安定した高い強度で両樹脂を接合することができるものである。
【００５１】
また請求項６の発明は、溶け込み代の形状がアンダーカット形状であるので、この溶け込み代に溶け込んで冷却固化された樹脂もアンダーカット形状となり、このアンダーカット形状の樹脂によってアンカー効果を得ることができ、さらに安定した高い強度で両樹脂を接合することができるものである。
【図面の簡単な説明】
【図１】本発明の実施の形態の一例を示す断面図である。
【図２】同上の他例を示す断面図である。
【図３】同上の他例を示す断面図である。
【図４】同上の他例を示す断面図である。
【図５】同上の他例を示す断面図である。
【図６】同上の他例を示す断面図である。
【図７】同上の他例を示す断面図である。
【符号の説明】
Ｌ レーザー光
１ レーザー光に対して透過特性を有する熱可塑性樹脂
２ レーザー光に対して吸収特性を有する熱可塑性樹脂
３ 位置決め構造
４ 凹部
５ 凸部
６ 嵌合面
７ 傾斜面
８ 溶け込み代
１７ 金属片
θ 立ち上げ角[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for joining thermoplastic resins with a laser.
[0002]
[Prior art]
A conventional vibration type linear actuator used for manufacturing an electric razor or the like includes a stator, a movable element, and a frame that supports the movable element in a reciprocating manner via a leaf spring. Is integrally formed with a connecting member for connection with the mover (see, for example, Patent Document 1). And the said coupling member is formed as a convex part fitted to the recess provided in the needle | mover side, and is welded by this fitting part, and the positioning part for positioning with a needle | mover is set to the said coupling member And is welded to the mover at this positioning portion.
[0003]
The connecting member and the mover are usually molded articles of a thermoplastic resin, and generally an ultrasonic welding method (vibration welding method) has been used as a joining method of such a thermoplastic resin.
[0004]
[Patent Document 1]
JP-A-11-285226 (Claims etc.)
[0005]
[Problems to be solved by the invention]
However, when joining thermoplastic resin molded products by ultrasonic welding, high-frequency vibration is applied to these molded products, and this vibration causes damage. When such damage occurs at the joint location, the joint strength decreases.
[0006]
Moreover, even if the positioning portion is provided at the joint location as described above, the positioning portion is damaged by the high frequency vibration, and a situation occurs in which the positioning portion is displaced despite the positioning portion being provided. May become difficult. Although a jig for positioning may be used separately, such a jig is generally expensive and there is a problem that initial cost is increased.
[0007]
The present invention has been made in view of the above points, can be positioned with high accuracy between thermoplastic resins, does not require the use of expensive jigs, and can reduce the initial cost. An object of the present invention is to provide a method for joining thermoplastic resins with a laser, which can be joined with stable and high strength.
[0008]
[Means for Solving the Problems]
The thermoplastic resin joining method using laser according to claim 1 of the present invention includes the positioning structure 3 provided in the thermoplastic resin 1 having transmission characteristics with respect to the laser beam L and the thermoplastic resin 2 having absorption characteristics. These thermoplastic resins 1 and 2 are positioned and overlapped, and the thermoplastic resin 1 having absorption characteristics is irradiated by irradiating the laser light L through the thermoplastic resin 1 from the side of the thermoplastic resin 1 having transmission characteristics. When the thermoplastic resins 1 and 2 are welded and joined by heating, a metal piece 17 is embedded by insert molding in advance around the portion of the permeable resin 1 that is to be joined. It is characterized by this.
[0009]
The invention of claim 2 is characterized in that, in claim 1, the positioning structure 3 is formed by fitting the concave portion 4 and the convex portion 5 together.
[0010]
According to a third aspect of the present invention, in the second aspect of the present invention, the cross-sectional shape of the fitting surface 6 between the concave portion 4 and the convex portion 5 is a wave shape.
[0011]
The invention of claim 4 is characterized in that, in claim 2 or 3, the inclined surface 7 is provided on the convex portion 5 by setting the rising angle θ of the convex portion 5 to an angle smaller than a right angle.
[0012]
According to a fifth aspect of the present invention, in any one of the second to fourth aspects, a penetration allowance 8 for melting the resin 2 melted by heating is provided in both or one of the concave portion 4 and the convex portion 5. It is what.
[0013]
The invention of claim 6 is characterized in that, in claim 5, the shape of the penetration allowance 8 is an undercut shape.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below.
[0015]
(Embodiment 1)
In the present embodiment, a thermoplastic resin 1 having transmission characteristics with respect to the laser light L (hereinafter referred to as “transmission resin 1”) and a thermoplastic resin 2 having absorption characteristics with respect to the laser light L (hereinafter referred to as “absorption resin”). 2 ”) is not particularly limited, and any one can be used. For example, ABS, polycarbonate, or the like can be used as the permeable resin 1, while ABS or polycarbonate in which carbon is blended as a pigment can be used as the absorbing resin 2.
[0016]
FIG. 1 shows this embodiment. A positioning structure 3 is provided in the transmission resin 1 and the absorption resin 2. This positioning structure 3 is due to the fitting between the concave portion 4 and the convex portion 5. That is, in what is shown in FIG. 1, the recessed part 4 is formed in the permeation | transmission resin 1, and it can position by inserting the absorption resin 2 in this recessed part 4. FIG. In this case, the entire absorbent resin 2 functions as the convex portion 5, and such a form of fitting is also included in the positioning structure 3 in the present invention. Here, as shown in FIG. 2, the convex portion 5 may be formed by providing a step on a part of the flat surface 18 of the absorbent resin 2, that is, the convex portion 5 may be formed on a part of the absorbent resin 2. The number of convex portions 5 to be formed is not particularly limited as long as it is the same as the number of concave portions 4, and is an arbitrary number. Further, the concave portions 4 and the convex portions 5 are attached to any of the resins 1 and 2. It may be formed.
[0017]
And as above-mentioned, it positions by the fitting of the recessed part 4 and the convex part 5, and the permeation | transmission resin 1 and the absorption resin 2 are piled up. At this time, as shown in FIG. 1, a contact pressure jig 9 that transmits the laser light L is disposed on the surface opposite to the overlapping side of the transmission resin 1, and at the opposite side of the absorption resin 2 from the overlapping side. The pressure contact jig 10 may also be disposed on the surface, and both the resins 1 and 2 may be sandwiched and pressed by the pressure contact jigs 9 and 10.
[0018]
Next, as indicated by an arrow in FIG. 1, the laser light L such as a YAG laser is irradiated on the side of the transparent resin 1. The laser light L passes through the contact pressure jig 9 and is irradiated to the transmissive resin 1, and further passes through the transmissive resin 1 and is then irradiated to the surface of the absorption resin 2. When the surface of the absorption resin 2 is irradiated with the laser beam L and absorbed, the absorption resin 2 in this portion generates heat and the interface between the two resins 1 and 2 is heated, and the interface between the two resins 1 and 2 is heated. Can be welded together.
[0019]
Thus, in this embodiment, since the ultrasonic welding method (vibration welding method) is not used when joining both the resins 1 and 2, damage due to high-frequency vibration does not occur at the joint location of both the resins 1 and 2. The two resins 1 and 2 can be joined with a stable and high strength.
[0020]
Moreover, since the positioning structure 3 is provided in both the resins 1 and 2, this resin 1 and 2 can be positioned with high precision by this positioning structure 3. Explaining this point a little further. For example, if both the resins 1 and 2 are formed in a flat plate shape, the laser light L is irradiated on the entire surface of the absorbing resin 2, and the entire interface between the both resins 1 and 2 is It is heated and becomes a molten state. Then, since both the resins 1 and 2 are flat as described above, they are not caught and are displaced from each other.
[0021]
Further, in the present embodiment, as described above, the positioning structures 3 are provided in both the resins 1 and 2, so that it is not necessary to separately use expensive jigs and the initial cost can be reduced. .
[0022]
(Embodiment 2)
Also in this embodiment, the permeable resin 1 and the absorption resin 2 which are the same material as Embodiment 1 can be used.
[0023]
FIG. 3 shows this embodiment. A positioning structure 3 is provided in the transmission resin 1 and the absorption resin 2. This positioning structure 3 is also due to the fitting between the concave portion 4 and the convex portion 5. That is, in what is shown in FIG. 3, the concave portion 4 is formed in the permeable resin 1, and positioning can be performed by fitting the absorbing resin 2 into the concave portion 4. Also in the present embodiment, the entire absorbent resin 2 functions as the convex portion 5, but the difference from the first embodiment is that the fitting surface 6 (surface irradiated with the laser light L) between the concave portion 4 and the convex portion 5. ) Is a wave-like cross-sectional shape. The wave shape is not particularly limited. For example, as shown in FIG. 3, a saw wave shape, a sine wave shape, and the like can be given.
[0024]
And as above-mentioned, it positions by the fitting of the recessed part 4 and the convex part 5, and the permeation | transmission resin 1 and the absorption resin 2 are piled up. At this time, as shown in FIG. 3, the contact pressure jig 9 that transmits the laser light L is disposed on the surface opposite to the overlapping side of the transmission resin 1, and the opposite side to the overlapping side of the absorbing resin 2 is disposed. The pressure contact jig 10 may also be disposed on the surface, and both the resins 1 and 2 may be sandwiched and pressed by the pressure contact jigs 9 and 10.
[0025]
Next, as indicated by an arrow in FIG. 3, the laser light L such as a YAG laser is irradiated on the side of the transmissive resin 1. The laser light L passes through the contact pressure jig 9 and is irradiated to the transmissive resin 1, and further passes through the transmissive resin 1 and is then irradiated to the surface of the absorption resin 2. When the surface of the absorption resin 2 is irradiated with the laser beam L and absorbed, the absorption resin 2 in this portion generates heat and the interface between the two resins 1 and 2 is heated, and the interface between the two resins 1 and 2 is heated. Can be welded together.
[0026]
As described above, in this embodiment, since the ultrasonic welding method (vibration welding method) is not used in joining both the resins 1 and 2, damage due to high-frequency vibration does not occur at the joint location of both resins 1 and 2. The two resins can be joined with a stable high strength.
[0027]
Further, at the time of irradiation with the laser beam L, the interface between the two resins 1 and 2 is heated to be in a molten state, but the two resins 1 and 2 are not simply formed in a flat plate shape. Since the positioning structure 3 is provided, both the resins 1 and 2 can be positioned with high accuracy by the positioning structure 3 by fitting the concave portion 4 and the convex portion 5 provided in the both resins 1 and 2. It is. In addition, in the present embodiment, since the cross-sectional shape of the fitting surface 6 between the concave portion 4 and the convex portion 5 is a wave shape as described above, the laser beam L is irradiated more than in the case of the first embodiment shown in FIG. The area of the surface of the absorbing resin 2 to be absorbed is increased, the number of joints increases due to the increase in the surface area, and the two resins 1 and 2 can be joined with stable and high strength. .
[0028]
Also in the present embodiment, as described above, since the positioning structures 3 are provided in both the resins 1 and 2, it is not necessary to separately use expensive jigs and the initial cost can be reduced. .
[0029]
(Embodiment 3)
Also in this embodiment, the permeable resin 1 and the absorption resin 2 which are the same material as Embodiment 1 can be used.
[0030]
FIG. 4 shows this embodiment. A positioning structure 3 is provided in the transmission resin 1 and the absorption resin 2. This positioning structure 3 is also due to the fitting between the concave portion 4 and the convex portion 5. That is, in the structure shown in FIG. 4, a recess 4 is formed in the transmissive resin 1, and positioning can be performed by fitting the absorption resin 2 into the recess 4. Also in the present embodiment, the entire absorbent resin 2 functions as the convex portion 5. However, the difference from the first embodiment is that the rising angle θ of the convex portion 5 is a right angle (90 °) as shown in FIG. The inclined surface 7 is provided in the convex part 5 by setting it as a small angle (an angle larger than 0 degree). The case where the rising angle θ of the convex portion 5 is 0 ° or 90 ° means a case where the inclined surface 7 does not exist, for example, the case of the first embodiment shown in FIG. In addition, since the outer surface shape of the convex part 5 and the inner surface shape of the recessed part 4 are the same, the inclined surface 13 which contact | abuts the inclined surface 7 provided in the convex part 5 is provided in the inner surface of the recessed part 4. FIG. Moreover, although the front-end | tip of the convex part 5 is made into the flat surface 14 in this embodiment, it is not limited to this.
[0031]
And as above-mentioned, it positions by the fitting of the recessed part 4 and the convex part 5, and the permeation | transmission resin 1 and the absorption resin 2 are piled up. At this time, as shown in FIG. 4, a contact pressure jig 9 that transmits the laser light L is disposed on the surface opposite to the overlapping side of the transmission resin 1, and the side opposite to the overlapping side of the absorbing resin 2 is disposed. The pressure contact jig 10 may also be disposed on the surface, and both the resins 1 and 2 may be sandwiched and pressed by the pressure contact jigs 9 and 10.
[0032]
Next, as indicated by an arrow in FIG. 4, a laser beam L such as a YAG laser is irradiated on the transparent resin 1 side. The laser light L passes through the contact pressure jig 9 and is irradiated to the transmissive resin 1, and further passes through the transmissive resin 1 and is then irradiated to the surface of the absorption resin 2. When the surface of the absorption resin 2 is irradiated with the laser beam L and absorbed, the absorption resin 2 in this portion generates heat and the interface between the two resins 1 and 2 is heated, and the interface between the two resins 1 and 2 is heated. Can be welded together.
[0033]
As described above, in this embodiment, since the ultrasonic welding method (vibration welding method) is not used in joining both the resins 1 and 2, damage due to high-frequency vibration does not occur at the joint location of both resins 1 and 2. The two resins 1 and 2 can be joined with a stable and high strength.
[0034]
Further, at the time of irradiation with the laser beam L, the interface between the two resins 1 and 2 is heated to be in a molten state, but the two resins 1 and 2 are not simply formed in a flat plate shape. Since the positioning structure 3 is provided, both the resins 1 and 2 can be positioned with high accuracy by the positioning structure 3 by fitting the concave portion 4 and the convex portion 5 provided in the both resins 1 and 2. It is. Moreover, in this embodiment, since the inclined surface 7 is provided on the convex portion 5 as described above, the dead angle (the outer peripheral side surface 12 of the convex portion 5) of the laser light L is larger than in the case of the first embodiment shown in FIG. The area of the surface of the absorption resin 2 that is absorbed by being irradiated with the laser beam L is increased, and the number of joints increases due to the increase in the surface area. Can be joined.
[0035]
Also in the present embodiment, as described above, since the positioning structures 3 are provided in both the resins 1 and 2, it is not necessary to separately use expensive jigs and the initial cost can be reduced. .
[0036]
(Embodiment 4)
Also in this embodiment, the permeable resin 1 and the absorption resin 2 which are the same material as Embodiment 1 can be used.
[0037]
FIG. 5 shows this embodiment. A positioning structure 3 is provided in the transmission resin 1 and the absorption resin 2. This positioning structure 3 is also due to the fitting between the concave portion 4 and the convex portion 5. That is, in the structure shown in FIG. 5, a recess 4 is formed in the transmissive resin 1, and positioning can be performed by fitting the absorption resin 2 into the recess 4. Also in the present embodiment, the entire absorbent resin 2 functions as the convex portion 5. However, the difference from the first embodiment is that a melting allowance 8 for melting (flowing) the resins 1 and 2 melted by heating is provided. It is a point. The melt allowance 8 is provided in both the concave portion 4 and the convex portion 5 as shown in FIG. 5, or one of the concave portion 4 and the convex portion 5 as shown in FIG. 6 and FIG. Or only in the recess 4). Specifically, the allowance 8 can be provided by forming a gap (clearance) between the inner peripheral side surface 11 of the concave portion 4 and the outer peripheral side surface 12 of the convex portion 5. However, when a gap is formed between the entire inner peripheral side surface 11 of the concave portion 4 and the entire outer peripheral side surface 12 of the convex portion 5, that is, the convex portion 5 is smaller than the concave portion 4 (the concave portion 4 is larger than the convex portion 5). ), The gap 8 is not formed between the entire inner peripheral side surface 11 of the concave portion 4 and the entire outer peripheral side surface 12 of the convex portion 5 when the melt allowance 8 is provided. . That is, in the case shown in FIG. 5 to FIG. 7, since there is a melt allowance 8 on both sides of the absorbent resin 2, it seems that the absorbent resin 2 is displaced with respect to the permeable resin 1 (in the permeable resin 1). Although it seems that the absorbent resin 2 functioning as the convex portion 5 can move to the left and right within the formed concave portion 4), these drawings show only one cross section, and in the other cross section, FIG. As in the case shown in FIG. 4, there is a place where the inner peripheral side surface 11 of the concave portion 4 and the outer peripheral side surface 12 of the convex portion 5 come into contact with each other. It can be positioned.
[0038]
Moreover, in this embodiment, the shape of the penetration allowance 8 is made into the undercut shape. Specifically, as shown in FIG. 5, the groove portion 15 is provided in a part of the outer peripheral side surface 12 of the convex portion 5 so that the shape of the penetration allowance 8 is an undercut shape.
[0039]
And as above-mentioned, it positions by the fitting of the recessed part 4 and the convex part 5, and the permeation | transmission resin 1 and the absorption resin 2 are piled up. At this time, as shown in FIG. 5, the contact pressure jig 9 that transmits the laser light L is disposed on the surface opposite to the overlapping side of the transmission resin 1, and at the opposite side of the absorption resin 2 from the overlapping side. The pressure contact jig 10 may also be disposed on the surface, and both the resins 1 and 2 may be sandwiched and pressed by the pressure contact jigs 9 and 10.
[0040]
Next, as indicated by an arrow in FIG. 5, a laser beam L such as a YAG laser is irradiated on the transparent resin 1 side. The laser light L passes through the contact pressure jig 9 and is irradiated to the transmissive resin 1, and further passes through the transmissive resin 1 and is then irradiated to the surface of the absorption resin 2. When the surface of the absorption resin 2 is irradiated with the laser beam L and absorbed, the absorption resin 2 in this portion generates heat and the interface between the two resins 1 and 2 is heated, and the interface between the two resins 1 and 2 is heated. Can be welded together.
[0041]
As described above, in this embodiment, since the ultrasonic welding method (vibration welding method) is not used in joining both the resins 1 and 2, damage due to high-frequency vibration does not occur at the joint location of both resins 1 and 2. The two resins 1 and 2 can be joined with a stable and high strength.
[0042]
Further, at the time of irradiation with the laser beam L, the interface between the two resins 1 and 2 is heated to be in a molten state, but the two resins 1 and 2 are not simply formed in a flat plate shape. Since the positioning structure 3 is provided, both the resins 1 and 2 can be positioned with high accuracy by the positioning structure 3 by fitting the concave portion 4 and the convex portion 5 provided in the both resins 1 and 2. It is. In addition, in the present embodiment, since the allowance 8 is provided as described above, the absorbing resin 2 that has generated heat by being irradiated with the laser light L is heated and melted together with the transmissive resin 1, and the resins 1 and 2 are added to the allowance 8. By melting (flowing) and being cooled and solidified at this point, both resins can be joined with higher stability and strength. More specifically, in the one shown in FIGS. 5 to 7, the absorption resin 2 on the flat surface 14 at the tip of the convex portion 5 generates heat by being irradiated with the laser light L and is heated and melted together with the nearby transmission resin 1. , 2 wraps around the welding allowance 8 provided between the outer peripheral side surface 12 of the convex portion 5 and the inner peripheral side surface 11 of the concave portion 4, thereby joining the two resins 1 and 2 to the outer peripheral side surface 12 of the convex portion 5 and the concave portion 4. It is possible to perform the process firmly between the inner side surface 11 and the two resins 1 and 2 with more stable and high strength.
[0043]
In this embodiment, since the shape of the penetration allowance 8 is an undercut shape as shown in FIG. 5, the resins 1 and 2 melted into the penetration allowance 8 and cooled and solidified also become an undercut shape. The anchor effect can be obtained by the cut-shaped resins 1 and 2. Therefore, in addition to the joining by welding, the joining by the anchor effect is also performed, so that both resins 1 and 2 can be joined with a more stable and high strength.
[0044]
Also in the present embodiment, as described above, since the positioning structures 3 are provided in both the resins 1 and 2, it is not necessary to separately use expensive jigs and the initial cost can be reduced. .
[0045]
In addition, after welding by the irradiation of the laser beam L, when removing both the resins 1 and 2 from the contact pressure jig 10, a force in a direction substantially perpendicular (peeling direction) to the joint surface between the transmission resin 1 and the absorption resin 2 If they act on the resins 1 and 2 in opposite directions, both resins 1 and 2 may be peeled off depending on the magnitude of the force. Assuming such a situation, for example, as shown in FIG. 6, it is preferable to provide a rib 16 in advance on the periphery of the surface of the permeable resin 1 opposite to the overlapping side. If the rib 16 is provided in this way, when the force in the peeling direction acts on the permeable resin 1, the rib 16 can prevent the permeable resin 1 from being deformed, and the two resins 1 and 2 are peeled off. It is something that can be avoided. In the present invention, as shown in FIG. 7, in which previously embedded in advance by insert molding a metal piece 17 of SUS420 or the like around the portion to be the joint an internal of transmitting resin 1. When the metal piece 17 is embedded in this way, the rigidity of the transmissive resin 1 is increased by the metal piece 17 and is not easily deformed, and both the resins 1 and 2 can be prevented from being peeled off.
[0046]
【The invention's effect】
As described above, the thermoplastic resin joining method using the laser according to the first aspect of the present invention is based on the positioning structure provided in the thermoplastic resin having the transmission characteristic to the laser beam and the thermoplastic resin having the absorption characteristic. These thermoplastic resins are positioned and superposed, and these thermoplastic resins are transmitted from the side of the thermoplastic resin having transmission characteristics, irradiated with laser light, and heated by absorbing the thermoplastic resin. Because the thermoplastic resin is welded and joined, the ultrasonic welding method does not cause damage due to high-frequency vibration at the joint location of both resins, and the two resins can be joined with stable high strength. In addition, the positioning structure provided on both resins makes it possible to position both resins with high accuracy, eliminating the need to use expensive jigs and tools separately. In which it is possible to reduce the initial cost.
In the invention of claim 1, since a metal piece is embedded in advance by insert molding around the portion to be joined inside the permeable resin, the rigidity of the permeable resin is increased by this metal piece and is not easily deformed. Thus, both resins can be prevented from being peeled off.
[0047]
In the invention of claim 2, since the positioning structure is based on the fitting of the concave portion and the convex portion, the joint portion between the two resins is not damaged by high-frequency vibration and is stable unlike the ultrasonic welding method. Both resins can be joined with high strength, and the positioning structure by fitting the concave and convex portions provided in the two resins allows the two resins to be positioned with high accuracy, which is an expensive treatment. There is no need to use a separate tool, and the initial cost can be reduced.
[0048]
In the invention of claim 3, since the cross-sectional shape of the fitting surface between the concave portion and the convex portion is corrugated, the surface area of the absorbing resin that is absorbed by the irradiation with the laser light is increased. The two resins can be joined with higher stability and higher strength.
[0049]
In the invention of claim 4, since the inclined surface is provided on the convex portion by setting the rising angle of the convex portion to be smaller than the right angle, the dead angle of the laser light is reduced and the absorption absorbed by the irradiation with the laser light is reduced. The area of the surface of the resin is increasing, and by increasing the surface area, the two resins can be joined with high stability and high strength.
[0050]
Further, in the invention of claim 5, since a melting allowance for melting the resin melted by heating is provided in both or one of the concave portion and the convex portion, the resin melted by heating by laser light irradiation also melts in the melt allowance. By cooling and solidifying at this location, both resins can be joined with higher stability and strength.
[0051]
In the invention of claim 6, since the shape of the penetration allowance is an undercut shape, the resin melted into the penetration allowance and cooled and solidified also becomes an undercut shape, and the anchor effect can be obtained by this undercut shape resin. In addition, both resins can be joined with a stable and high strength.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing an example of an embodiment of the present invention.
FIG. 2 is a cross-sectional view showing another example of the above.
FIG. 3 is a cross-sectional view showing another example of the above.
FIG. 4 is a cross-sectional view showing another example of the above.
FIG. 5 is a cross-sectional view showing another example of the above.
FIG. 6 is a cross-sectional view showing another example of the above.
FIG. 7 is a cross-sectional view showing another example of the above.
[Explanation of symbols]
L Laser light 1 Thermoplastic resin having transmission characteristics with respect to laser light 2 Thermoplastic resin having absorption characteristics with respect to laser light 3 Positioning structure 4 Recess 5 Protrusion 6 Fitting surface 7 Inclined surface 8 Melting allowance
17 Metal piece θ Rising angle

Claims (6)

レーザー光に対して透過特性を有する熱可塑性樹脂と吸収特性を有する熱可塑性樹脂とに設けた位置決め構造によってこれらの熱可塑性樹脂を位置決めすると共に重ね合わせ、透過特性を有する熱可塑性樹脂の側からこの熱可塑性樹脂を透過させてレーザー光を照射して、吸収特性を有する熱可塑性樹脂を加熱することによって、これらの熱可塑性樹脂を溶着して接合するにあたって、透過樹脂の内部であって接合箇所となる部分の周囲に金属片をあらかじめインサート成形によって埋設しておくことを特徴とするレーザーによる熱可塑性樹脂の接合方法。These thermoplastic resins are positioned and superposed by a positioning structure provided on a thermoplastic resin having a transmission characteristic with respect to laser light and a thermoplastic resin having an absorption characteristic, and the thermoplastic resin having a transmission characteristic is arranged from the side. When these thermoplastic resins are welded and joined by irradiating the thermoplastic resin with laser light and heating the thermoplastic resin having absorption characteristics, the inside of the permeable resin and the joining location A method of joining thermoplastic resin by laser, characterized in that a metal piece is embedded in advance around the portion to be formed by insert molding . 位置決め構造が、凹部と凸部との嵌合によるものであることを特徴とする請求項１に記載のレーザーによる熱可塑性樹脂の接合方法。  2. The method for joining thermoplastic resins by a laser according to claim 1, wherein the positioning structure is a fitting between the concave portion and the convex portion. 凹部と凸部との嵌合面の断面形状が波形状であることを特徴とする請求項２に記載のレーザーによる熱可塑性樹脂の接合方法。  The method for joining thermoplastic resins by a laser according to claim 2, wherein the cross-sectional shape of the fitting surface between the concave portion and the convex portion is a wave shape. 凸部の立ち上げ角を直角より小さい角度とすることによって凸部に傾斜面を設けることを特徴とする請求項２又は３に記載のレーザーによる熱可塑性樹脂の接合方法。  4. The method for joining thermoplastic resins with a laser according to claim 2, wherein an inclined surface is provided on the convex portion by setting the rising angle of the convex portion to an angle smaller than a right angle. 加熱により溶融した樹脂が溶け込むための溶け込み代を、凹部と凸部の両方又はいずれか一方に設けることを特徴とする請求項２乃至４のいずれかに記載のレーザーによる熱可塑性樹脂の接合方法。  The method for joining thermoplastic resins by a laser according to any one of claims 2 to 4, wherein a penetration allowance for melting the resin melted by heating is provided in either or both of the concave portion and the convex portion. 溶け込み代の形状がアンダーカット形状であることを特徴とする請求項５に記載のレーザーによる熱可塑性樹脂の接合方法。  6. The method of joining thermoplastic resin by laser according to claim 5, wherein the shape of the allowance is an undercut shape.
JP2003010356A 2003-01-17 2003-01-17 Method of joining thermoplastic resin by laser Expired - Fee Related JP4089441B2 (en)

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